JP7373480B2 - injection head - Google Patents

Description

The present invention relates to a fire extinguishing gas injection device that extinguishes a fire by discharging a fire extinguishing gas such as _N2 gas or halide gas as a fire extinguishing agent into a space within a section of a building to be extinguished, and a gas fire extinguishing device equipped with the same. , More specifically, it relates to a fire extinguishing gas injection device that can be suitably implemented in order to reduce loud noises generated when extinguishing gas is injected from an injection head provided in a section to be extinguished, and a gas fire extinguishing device equipped with the same. .

BACKGROUND ART Conventionally, various buildings have been equipped with gas fire extinguishing devices that extinguish fires by discharging extinguishing gases such as CO ₂ gas, N ₂ gas, and halide gas as extinguishing agents into a space within a compartment to be extinguished.

FIG. 31 is a perspective view showing a part of the structure including the injection head 3 of a conventional gas fire extinguishing system. High-pressure extinguishing gas supplied from the extinguishing gas supply source 2 when a fire occurs is guided to a conduit 4 and is injected from an injection head 3 connected to the conduit 4.

The conduit 4 includes a main pipe 5 connected to the extinguishing gas supply source 2, a branch pipe 6 interposed in the main pipe 5, and an extinguishing gas from the main pipe 5 guided by the branch pipe 6, to which the injection head 3 is connected. It has a branch pipe 7. The main pipe 5 is fastened to a building frame or a base 8 and a bracket 9 fixed to the frame using fasteners 10 such as U-bolts, and is installed in a state where vibration and displacement of the injection head 3 are suppressed ( For example, see Patent Document 1).

In the prior art, a large amount of high-pressure extinguishing gas supplied from the extinguishing gas supply source 2 through the conduit 4 is injected from the injection head 3, so that the high-pressure extinguishing gas is There is a problem in that the flow of extinguishing gas that is injected at high speed generates a loud sound that cuts through the air.

In another conventional technique for solving this problem (for example, see Patent Document 2), a sound damping means made of a sound deadening material made of a porous material is provided at the outlet of an orifice that injects fire extinguishing gas, and this sound deadening material may be of a monolithic structure extending in the axial direction of the orifice and formed thick, or of two overlapping divided structures extending in the axial direction of the orifice and each formed thick.

This new problem with the prior art is that the various injection and silencing characteristics must be accurately determined in response to the flow rate and pressure of the extinguishing gas injected into the space within the area to be extinguished, as well as the degree of silencing required. This is difficult to adjust and obtain.

Japanese Unexamined Patent Publication No. 8-173565 Patent No. 5276728

An object of the present invention is to provide a fire extinguishing gas injection device and a fire extinguishing gas injection device capable of attenuating sound caused by a jet flow of fire extinguishing gas from an injection head, and which is easy to obtain by accurately adjusting various injection and silencing characteristics. The object of the present invention is to provide a gas fire extinguishing system equipped with the same.

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas into a space within a fire extinguishing target section of a building, and the fire extinguishing gas injection device includes an injection head and a sound source generated by the discharge of extinguishing gas from the injection head. It has a silencing means for attenuating the noise, and the silencing means includes a first silencing member provided on the side of the jetting head, and a second silencing member provided on the downstream side of the first silencing member. Each of the first and second sound deadening members is formed into a flat plate shape and is made of a porous material through which gas can flow.

In the fire extinguishing gas injection device configured in this way, compared to the case where the sound deadening material is constructed from cylindrical blocks, it is possible to change the injection and sound deadening characteristics as appropriate by changing the number of laminated sheets.

Preferably, the first and second sound deadening members are stacked to form a columnar or cylindrical shape.

Preferably, the first and second sound deadening members have the same outer diameter.
Preferably, the first and second sound deadening members have the same thickness.

Preferably, the entire outer peripheral surfaces of the first and second sound deadening members are exposed to the atmosphere.
Preferably, the apparatus further includes an annular or plate-shaped pressing member for fixing the second sound deadening member.

Preferably, the silencing means has a first silencing means located on the upstream side and a second silencing means located on the downstream side, and a gas is disposed between the first silencing means and the second silencing means. An intermediate member is arranged through which the fluid can flow.

The gas fire extinguishing system includes any of the above-mentioned fire extinguishing gas injection devices, a conduit that guides high-pressure extinguishing gas to the extinguishing gas injection device, and a fire extinguishing gas supply source that supplies high-pressure extinguishing gas to the conduit. .

1 is a perspective view showing a part of the configuration of a gas fire extinguishing device according to an embodiment of the present invention, including an injection head 100 and a muffling means 102. FIG. FIG. 2 is a perspective view showing the ejection head 100 and muffling means 102 of FIG. 1. FIG. FIG. 2 is a sectional view showing the ejection head 100 and the muffling means 102 of FIG. 1. FIG. FIG. 7 is a partially enlarged cross-sectional view showing a state in which the guide member 121 is sandwiched between the auxiliary attachment member 103 and the second sound deadening material 108. FIG. It is a sectional view showing an ejection head 700 and muffling means 701, 701a that were tested by the inventor of the present invention. FIG. 6 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention releases extinguishing gas using the configuration shown in FIG. 5; FIG. 5 is a cross-sectional view showing an ejection head 500 and muffling means 502, 502a tested by the inventor of the present invention. 8 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention releases extinguishing gas using the configuration of FIG. 7. FIG. It is a sectional view showing the gas fire extinguishing device of other embodiments of the present invention. 1 is a perspective view showing a part of the configuration of a gas fire extinguishing system according to an embodiment of the present invention, including an injection head 200 and a muffling means 202. FIG. FIG. 11 is a perspective view showing the ejection head 200 and muffling means 202 of FIG. 10. 11 is a sectional view showing the ejection head 200 and the muffling means 202 of FIG. 10. FIG. FIG. 6 is a partially enlarged sectional view showing a state in which the guide member 221 is sandwiched between the ejection head main body 201 and the sound deadening material 208. FIG. FIG. 5 is a cross-sectional view showing an ejection head 500 and muffling means 502, 502a tested by the inventor of the present invention. 15 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention releases extinguishing gas using the configuration shown in FIG. 14. FIG. It is a sectional view showing the gas fire extinguishing device of other embodiments of the present invention. FIG. 2 is a perspective view showing a part of the configuration of a gas fire extinguishing device according to an embodiment of the present invention, including an injection head 300 and a muffling means 302. FIG. 18 is a perspective view showing the ejection head 300 and muffling means 302 of FIG. 17. 18 is a sectional view showing the ejection head 300 and the muffling means 302 of FIG. 17. FIG. It is a sectional view showing an injection nozzle 500 and muffling means 502, 502a that were tested by the inventor of the present invention. 21 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention releases extinguishing gas using the configuration shown in FIG. 20. FIG. FIG. 2 is a perspective view showing a part of the configuration of a gas fire extinguishing system according to an embodiment of the present invention, including an injection head 400 and a muffling means 402. 23 is a perspective view showing the ejection head 400 and the muffling means 402 of FIG. 22. FIG. 23 is a sectional view showing the ejection head 400 and the muffling means 402 of FIG. 22. FIG. FIG. 4 is a partially enlarged cross-sectional view showing a state in which the guide member 421 is sandwiched between the attachment auxiliary member 403 and the sound deadening material 408. It is a sectional view showing an ejection head 700 and muffling means 701, 701a that were tested by the inventor of the present invention. FIG. 27 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention releases extinguishing gas using the configuration of FIG. 26. FIG. 5 is a cross-sectional view showing an ejection head 500 and muffling means 502, 502a tested by the inventor of the present invention. 29 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention releases extinguishing gas using the configuration of FIG. 28. FIG. It is a sectional view showing the gas fire extinguishing device of other embodiments of the present invention. FIG. 2 is a perspective view showing a part of the configuration including an injection head 3 of a conventional gas fire extinguishing system.

FIG. 1 is a perspective view showing a part of the configuration of a gas fire extinguishing system according to an embodiment of the present invention, including an injection head 100 and a muffling means 102. The gas fire extinguishing system of this embodiment is installed in a fire extinguishing section of a building, and the jet head 100 is connected to an injection head 100 that injects high-pressure extinguishing gas toward the space inside the fire extinguishing section. A conduit 14 that guides high-pressure extinguishing gas to the conduit 100, an extinguishing gas supply source 15 that supplies high-pressure extinguishing gas to the conduit 14, and injection from a nozzle hole 104 (see FIG. 3 described later) formed in the injection head 100. and muffling means 102 for attenuating the sound generated due to the injection of extinguishing gas.

The extinguishing gas is realized by non-flammable gases such as _N2 gas, _CO2 gas and halide gas. This type of extinguishing gas can be sufficiently diffused even in large-scale extinguishing areas where the extinguishing gas has a reaching distance of 15 m or more, and the space within the extinguishing area can be uniformly reached to a predetermined concentration of extinguishing agent in a short time. The fire can be extinguished.

The injection head 100 and the muffler 102 constitute a fire extinguishing gas injection section 111. In such a fire extinguishing gas injection unit 111, fire extinguishing gas is supplied from the fire extinguishing gas supply source 15 to the injection head 100 via the conduit 14. The conduit 14 is a main pipe 2 connected to a fire extinguishing gas supply source 15.
3, a branch pipe 18 interposed in the main pipe 23, and a branch pipe 19 connected to the branch pipe 18, through which high-pressure extinguishing gas from the extinguishing gas supply source 15 is injected. It is guided to the head 100. The conduit 14 is fastened to a base 20 and a bracket 21 with fasteners 22 such as U-bolts, and is installed in the building frame with vibration and displacement suppressed.

FIG. 2 is a perspective view showing the ejection head 100 and the muffling means 102, and FIG. 3 is a cross-sectional view showing the ejection head 100 and the muffling means 102. An injection head 100 having a noise-reducing function is installed on a wall in order to emit extinguishing gas to a section to be extinguished in a gas-based fire extinguishing equipment that uses extinguishing gas, and a noise-reducing means 102 is attached to an injection head main body 101 using an auxiliary member 103. composed of A nozzle hole 104, which is a choke, is directly formed in the jet head main body 101. Nozzle hole 104 limits the flow rate of extinguishing gas to a desired value.

The auxiliary attachment member 103 has a base 105 and an outward flange 106 continuous to the base 105. The base 105 is removably attached to the jet head body 101 by screws 107.

The muffling means 102 is composed of first and second muffling materials 113 and 108 made of a porous material through which gas can flow. The second sound deadening material 108 has a large diameter, and the first sound deadening material 113 has a small diameter compared to the second sound deadening material 108. The first and second sound deadening materials 113 and 108 each have a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated first sound deadening material 113 and second sound deadening material 108 is approximately cylindrical.

A rectifying member 109 is attached to the attachment auxiliary member 103 with screws 110. The rectifying member 109 has a rectifying hole 112 that is a choke. The above-mentioned first sound deadening material 113 made of a porous material through which gas can flow is housed within the rectifying member 109 . The first sound deadening material 113 has a plurality of members each having a thin disk shape, and these members are laminated. The rectifying hole 112 does not have the function of restricting the flow rate of the extinguishing gas, but functions to disperse and rectify the extinguishing gas that has been decelerated and depressurized by the first sound deadening material 113 and guide it to the next second sound deadening material 108. . An annular member 114 is interposed between the end surface of the outward flange 106 of the attachment auxiliary member 103 and the first sound deadening material 113. The annular member 114 forms a gap 115 between the ejection head main body 101 and the first sound deadening material 113 for holding and storing foreign matter such as minute rust from the nozzle hole 104. Prevent clogging.

FIG. 4 is a partially enlarged sectional view showing a state in which the guide member 121 is sandwiched between the auxiliary attachment member 103 and the second sound deadening material 108. As shown in FIG. An end surface 120 on one side (the left side in FIGS. 2 and 3) of the second sound deadening material 108 is disposed in contact with the annular attachment portion 122 of the guide member 121 and facing the outward flange 106 of the attachment auxiliary member 103. be done. The guide member 121 includes this attachment portion 122 and a short cylindrical guide portion 123 that is connected to the attachment portion 122 and guides the extinguishing gas.

A peripheral surface 124 and an end surface 125 on the other side (right side in FIGS. 2 and 3) of the second sound deadening material 108 fix the second sound deadening material 108 to the outward flange 106 of the mounting auxiliary member 103 via the mounting member 127. It is exposed to the atmosphere except for the portion that contacts the presser member 128, which serves as a ring member. The shaft portion of the mounting member 127 is inserted through the holding member 128 (ring member, annular member), the second sound deadening material 108, and the mounting portion 122 of the guide member 121, and is screwed onto the outward flange 106 of the mounting auxiliary member 103. Ru.

As shown in FIG. 4, the mounting portion 122 of the guide member 121 fits into a mounting seat 131 formed in an annular recess on the outward flange 106 of the mounting auxiliary member 103, and is located radially inward from the mounting seat 131. It protrudes from the end surface 132 (lower side in FIG. 4) by a gap ΔL1.

Referring again to FIG. 3, in the ejection head 100, the ejection head main body 101 includes a base 137 and a hooking portion 138 continuous with the base 137. A base 137 of the injection head 100 is removably connected to the end 14a of the conduit 14 by a first screw 112 which is a tapered screw.

The attachment auxiliary member 103 is removably provided on the base 137 of the ejection head main body 101. Various jet head bodies 101 having different diameters of nozzle holes 104 are individually selected and used depending on the length of the conduit 14 and the like. I will explain the reason. Gas fire extinguishing equipment is designed to quickly fill the space within the area to be extinguished with extinguishing gas while ensuring the large flow rate (for example, 20,000 to 100,000 liters/min) required for its original role of extinguishing fires. The fire extinguishing gas must be constructed so as to ensure a high flow velocity (for example, 100 m/s) and discharge extinguishing gas. For this reason, the Fire Service Act Enforcement Regulations stipulate that the radiation pressure of extinguishing gas from the nozzle hole 104 of the injection head 100 in a gas fire extinguishing system is 1.9 MPa or more, and in practice it is 2 to 3 MPa (≒ 20 to 30 kgf/ cm ² , and even higher, up to about 6 MPa≈60 kgf/cm ² ).

Therefore, the diameter of the nozzle hole 104 of the injection head 100 is set such that the extinguishing gas injected from the nozzle hole 104 achieves the above-mentioned large flow rate, high flow velocity, and high radiation pressure. The length of the conduit 14 to the installation location of 100 etc. must be set depending on the conduit resistance.

Therefore, the aperture of the nozzle hole 104 differs depending on the length of the conduit 14, etc. Therefore, various ejection heads 100 with different apertures of the nozzle hole 104 are individually selected and used for each installation location of the ejection head 100. Must. In this way, in a gas fire extinguishing system, various injection heads 100 having different diameters of nozzle holes 104 are essential.

The sound deadening means 102 includes a first sound deadening material 113, a second sound deadening material 108, a pressing member 128, and a mounting member 127. The first and second sound deadening materials 113 and 108 are made of a porous material through which gas can flow, for example, a porous metal in which fine metal powder or fine metal filaments are sintered. The fine voids in the material 108 are smaller than the voids in the first sound deadening material 113, and the high pressure extinguishing gas can be expanded smoothly and slowly under reduced pressure to effectively achieve a sound deadening effect without reducing the flow rate. The first sound deadening material 113 and the second sound deadening material 108 are designed according to the flow conditions of the extinguishing gas, such as the diameter and length of the nozzle hole 104 and the straightening hole 112, the number and formation position of the nozzle hole 104 and the straightening hole 112. Therefore, porous materials having different density and density of voids can be appropriately selected and used. Further, the first and second sound deadening materials 113 and 108 may be constructed by laminating a plurality of wire mesh layers, for example, or may be a plate-shaped molded product made of synthetic resin fibers or a porous member.

The first and second sound deadening materials 113 and 108 are formed into a flat plate shape such as a disk, the second sound deadening material 108 has a larger diameter than the first sound deadening material 113, and a plurality of sheets are laminated. . The overall shape of the stacked first and second sound deadening materials 113 and 108 is, for example, cylindrical. An end surface 120 on one side in the axial direction (left side in FIG. 3) of the laminated second sound deadening material 108 faces the right side in FIG. For example, the peripheral surface 124 of the second sound deadening material 108, which is arranged and stacked in contact with each other, is exposed to the atmosphere.

The pressing member 128 presses the end surface 125 on the other side (right side in FIG. 3) of the laminated second sound deadening material 108. The pressing member 128 has a flat plate shape and has a circumferential surface 124 extending along the circumferential surface 124 of the second sound deadening material 108 .

The attachment member 127 is in this embodiment a bolt as a threaded member and is indicated using the same reference numerals. A plurality of attachment members 127 (for example, six) are arranged at equal intervals around the axis L103. The shaft portion of the mounting member 127 is inserted into the bolt insertion hole formed in the holding member 128 and the second sound deadening material 108, and the head of the mounting member 127 is inserted into the bolt insertion hole formed in the holding member 128 and the second sound deadening material 108, and It locks on the side (right side in Figure 3). A male thread formed on the shaft portion of the attachment member 127 is removably screwed into a female thread formed in a hole drilled in the engaging portion 138. As a result, the mounting member 127 clamps and fixes the laminated second sound deadening material 108 between the engaging portion 138 and the pressing member 128.

Each axis of the attachment member 127 is parallel to the axis L103 of the end 14a of the conduit 14. The axes of the end 14a of the conduit 14, the jetting head 100, and the muffling means 102 are in a straight line. With the silencing means 102 attached to the ejection head 100, the workability of connecting the base 137 of the ejection head main body 101 to the end 14a of the conduit 14 using the first screw 112 is good.

The axis L103 of the end 14a of the conduit 14 is aligned with the axes of the ejection head 100 including the ejection head main body 101, the second sound deadening material 108, and the pressing member 128. Therefore, the workability of the connection between the end 14a of the conduit 14 and the base 137 of the ejection head main body 101 using the first screw 112 and the connection between the base 137 of the ejection head main body 101 and the rectifying member 109 using the second screw 107 is as follows. In good condition. This good connection workability means that, in many cases, the injection head 100 and the silencing means 102 are installed in a section of the building to be extinguished, in a place that does not pose an obstacle to the movement of people, such as on a ceiling that is higher than the person's height. This is important considering that it will be connected to places such as

When extinguishing a fire, the high-pressure fire extinguishing gas injected through the nozzle hole 104 gradually passes through the fine gaps of the second sound deadening material 108, depressurizes and expands smoothly, and generates sound. is suppressed and sprayed into the space within the fire extinguishing section of the building. The extinguishing gas from the circumferential surface 124 of the first sound deadening material 108 is radially injected horizontally near the ceiling, and can be uniformly and quickly spread throughout the space within the section to be extinguished. Therefore, it is possible to quickly extinguish the fire in the area to be extinguished.

This second sound deadening material 108 makes it possible to attenuate the sound caused by the jet flow of fire extinguishing gas from the jet head while reducing the size of the configuration, and accurately adjust the jetting and sound damping characteristics to reduce the flow rate of fire extinguishing gas. It is possible to achieve a large sound reduction effect without any noise.

In the embodiment described above, the silencing means 102, which has a more complicated configuration than the ejection head 100, is removable and replaceable by the mounting member 127 to various ejection heads 100 having different diameters of the nozzle holes 104. The second sound deadening materials 113 and 108 can now be used in common for various types of ejection heads 100. This common use facilitates mass production of the first and second sound deadening materials 113, 108, and improves productivity.

In addition, depending on whether or not there is a need for silencing in the fire extinguishing area, individual selection and use is easily possible. Simplification can be achieved. Furthermore, the silencing means 102 that has been removed from a fire extinguishing area where there is no longer a need for sound silencing can be attached to another fire extinguishing area to be reused, resulting in good economic efficiency and energy savings. will be promoted.

In other embodiments of the invention, the jetting head 100 and the muffling means 102 may be configured integrally, ie non-removably. In this embodiment, the base 137 of the ejection head main body 101 is detachably provided at the end 14a of the conduit 14 using the first screw 112, and various ejection heads 100 having different diameters of the nozzle holes 104 can be individually connected. It may be used selectively.

Further, the ejection head 100 and the silencing means 102 are connected in advance by the second screw 107 and the mounting member 127 to form an assembly, and then the base 137 of the ejection head main body 101 in this assembly is connected to the end of the conduit 14. The workability of connecting the first screw 112 to the portion 14a is also good.

Further, in order to make the existing fire extinguishing target section, in which the base 137 of the jet head main body 101 is connected to the end 14a of the conduit 14 by the first screw 112, into a fire extinguishing target section that should be silenced, the ejection head main body 101 is engaged. When the silencing means 102 is connected to the section 138 by the second screw 107, the workability of the connection is also good.

A gap 115 exists between the end surface of the first sound deadening material 113 facing the nozzle hole 104 and the end surface of the ejection head main body 101 facing the first sound deadening material 113. When extinguishing gas is injected from the nozzle hole 104, fine foreign matter is stored and stored in the gap, so that it is possible to prevent the nozzle hole 104 from being clogged by foreign matter, and to reduce noise caused by foreign matter clogging. It is possible to prevent a decrease in the flow rate during generation and release.

Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit is a plated tube, rust, and sealing materials used in pipe fittings. Such as debris. In addition, by reducing the pressure inside the injection head 100 and releasing the extinguishing gas radially outward, the injection reaction force that acts from the injection head 100 backwards (to the left in FIG. 3) on the conduit 14 when injecting the extinguishing gas is reduced. It can be reduced to about 1/9 of the conventional technology shown in FIG.

In another embodiment of the present invention, an ejection head 700 is provided in which the end face of the first sound deadening material 113 disposed on the nozzle hole 104 side in the above-described embodiment, the ejection head main body 101, and the attachment auxiliary member 103 are integrated. The inventor of the present invention has confirmed that the sound deadening effect does not decrease even if the end face disposed opposite the first sound deadening material 113 is spaced apart. The experiment and its results will be described below with reference to FIGS. 5 and 6.

FIG. 5 is a cross-sectional view showing the jet head 700 and silencing means 701, 701a tested by the inventor, and FIG. FIG. 3 is a diagram showing a change in sound pressure level over time. In FIG. 5(1), extinguishing gas, which is N ₂ gas, from conduit 714 is injected from nozzle hole 704 of injection head 700 .

Four sheets of first sound deadening material 705 are stacked and housed in a rectifying member 703 attached to the ejection head 700 . Further, on the downstream side of the rectifying member 703 in the extinguishing gas release direction (right side in FIG. 5), three second sound deadening materials 706 are stacked and arranged. The extinguishing gas that has passed through the first sound deadening material 705 passes through the flow straightening hole 707 of the straightening member 703, is rectified, flows into the second sound deadening material 708, and radially outwards from the circumferential surface 709 of the second sound deadening material 708. At the same time, it is released from the release hole 752 of the holding member 728 into the space within the section to be extinguished. The first sound deadening material 705 closely contacts the flat end surface of the outlet end of the nozzle hole 704 of the ejection head 500 .

The supply pressure of the extinguishing gas supplied from the conduit 714 to the injection head 700 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is approximately 55 m ³ /min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 is, for example, 3 MPa to 7 MPa. is approximately 60 to 100 m/sec. The porosity of the voids in the sound deadening material 508 used in this experiment was approximately 97%, the diameter was approximately 130 mm, the thickness of the first sound deadening material 706 was 5 mm/piece, and the thickness of the second sound deadening material 708 was 10 mm/piece. It is one piece.

In FIG. 5(2), the first sound deadening material 705 of the sound deadening means 701a is arranged with a gap 753 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 704 of the ejection head 700, and the other configuration is as shown in FIG. 5(1).

FIG. 6 is a diagram showing the time course of the sound pressure level obtained by the inventor of the present invention when extinguishing gas was released using the configuration shown in FIG. Line 754 is the result of an experiment in which the first sound deadening material 705 is in close contact with the flat end surface of the outlet end of the nozzle hole 704 as shown in FIG. ) is an experimental result based on a configuration in which the first sound deadening material 705 is arranged with a gap 753 from the flat end surface of the outlet end of the nozzle hole 704.

From these experimental results, it was found that according to the configuration in which the first sound damping material 705 was placed in close contact with the flat end surface of the outlet end of the nozzle hole 704 (FIG. 5 (1)), the configuration in which it was placed with a gap 753 ( It was confirmed that there was almost no difference in the silencing effect compared to Fig. 5 (2)). Therefore, it has been confirmed that even if a gap 753 is provided between the end face of the first sound deadening material 705 facing the nozzle hole 704 and the end face facing the first sound deadening material 705 of the ejection head 700, the sound deadening effect does not deteriorate. Ta.

By providing such a gap 753 between the end face of the first sound deadening material 705 facing the nozzle hole 704 and the end face facing the first sound deadening material 705 of the ejection head 700, the sound deadening effect can be maintained without reducing the sound deadening effect. When fine foreign matter is stored and stored in the gap 753 and extinguishing gas is injected from the nozzle hole 704, it is possible to prevent the foreign matter from clogging the first and second sound deadening materials 705, 706, and to prevent the foreign matter from clogging the first and second sound deadening materials 705, 706. Noise caused by clogging can be prevented. Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit 14 is a plated tube, rust, and sealing material used in pipe fittings. fragments, etc.

FIG. 7 is a sectional view showing the ejection head 500 and the muffling means 502, 502a tested by the inventor of the present invention. In FIG. 7(1), extinguishing gas, which is N ₂ gas from conduit 514, is injected from nozzle hole 504 of injection head 500.

Eleven sheets of sound deadening material 508 are stacked and housed in a right cylindrical housing 551 of the sound deadening means 502 attached to the ejection head 500. The extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 552 of the housing 551 into the space within the section to be extinguished. The sound deadening material 508 closely contacts the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500 .

The supply pressure of the extinguishing gas supplied from the conduit 514 to the injection head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is approximately 55 m ³ /min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 is, for example, 3 MPa to 7 MPa. is approximately 60 to 100 m/sec. The porosity of the sound deadening material 508 used in this experiment was approximately 97%, the diameter was approximately 130 mm, and the thickness was 10 mm/sheet.

In FIG. 7(2), the sound deadening material 508 of the sound deadening means 502a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500, and the other configuration is as shown in FIG. This is the same as 1).

FIG. 8 is a diagram showing the time course of the sound pressure level obtained by the inventor of the present invention when extinguishing gas was released using the configuration shown in FIG. Line 554 is the result of an experiment in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 7(1), and line 555 is the result of an experiment as shown in FIG. These are experimental results based on a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, it was found that according to the configuration in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 7 (1)), the configuration in which the sound deadening material 508 is arranged with a gap 553 (FIG. 7 It was confirmed that a large noise reduction effect of approximately 16 dB was obtained compared to (2)). Therefore, it has been confirmed that according to the embodiment in which the end face of the sound deadening material 508 facing the nozzle hole 504 and the end face facing the sound deadening material 508 of the ejection head 500 are brought into close contact with each other, the sound deadening effect is improved. It was done.

FIG. 9 is a sectional view showing a gas fire extinguishing device according to another embodiment of the present invention. In the muffling means 600 of this gas fire extinguishing system, the above-mentioned guide member 121 is omitted. The function of the guide member 121 will be explained with reference to FIG.

The extinguishing gas from each of the plurality of nozzle holes 609 formed in a uniform distribution over the entire surface of the flat nozzle portion 608 of the jet head main body 601 is injected along the mutually parallel axis of each nozzle hole 609, It gradually passes through the fine gaps of the first sound deadening material 613 and the second sound deadening material 610 disposed downstream of the nozzle hole 609, that is, smoothly, and expands under reduced pressure. The respective axes of the ejection head main body 601 and the first and second sound deadening materials 613, 610 are on a straight line. The fine voids in the first and second sound deadening materials 613, 610 give a pressure loss to the extinguishing gas passing through them.

Extinguishing gas is injected into the second sound deadening material 610 along the axis of each nozzle hole 609, and then injected into the second sound deadening material 610 through the second sound deadening material 613 and the rectifying hole 612 of the straightening member 611. Assuming that the path followed is a straight line for simplicity, the path length from each rectifying hole 612 to the most downstream end surface of the second sound deadening material 610, whose overall shape is approximately a right circular column, is as shown in the figure. 9 and designated by the reference numeral L601.

The path length from the side of the rectifying member 611 to the circumferential surface 614 of the second sound deadening material 610 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of extinguishing gas injected from the rectifying hole 612, if the outer diameter of the rectifying member 611 is configured to be relatively larger than the length of the second sound deadening material 610 in the axial direction, L601>L602.

The pressure loss acting on the fire extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of pressure loss in the second sound deadening material 610 is as shown by the isobar line 603, which connects positions where the same pressure loss occurs. . The pressure loss is greatest in the region on the axis of the second sound deadening material 610, and decreases as the peripheral region moves away from the axis. Since the extinguishing gas injected from the rectifying hole 612 tends to flow into an area where the pressure loss is small, the extinguishing gas in the second sound deadening material 610 is directed in the axial direction of the injection head main body 601 as indicated by the imaginary line reference mark 604. As shown, it also advances to the side as indicated by reference numeral 605 and also to the rear as indicated by reference numeral 606 . The lengths of reference numerals 604, 605, 606 are shown corresponding to the flow rate of extinguishing gas, with a relatively large flow of extinguishing gas flowing in said side and rear directions. In order to quickly fill the fire extinguishing target compartment with fire extinguishing gas, one of the plurality of second sound deadening materials 610 is placed near the wall surface (on the left side in FIG. The extinguishing gas is injected in the direction indicated by phantom line reference 604 and laterally in the direction indicated by reference 605 with as large a flow rate as possible, and the extinguishing gas proceeds in the direction behind as indicated by reference 606. Flow rate must be controlled.

In each of the embodiments described above in connection with the above-described FIGS. 1 to 8 of the present invention, the guide member 121 directs the fire extinguishing gas injected from the sound deadening materials 113, 108; The extinguishing gas is blocked from proceeding to 606 and is allowed to proceed in the axial direction 604 and sideways 605 of the injection head main body 101 and the injection head 700. As a result, even in large-scale extinguishing areas where the extinguishing gas reach distance is 15 meters or more, the extinguishing gas can be sufficiently diffused and the space within the extinguishing area can be uniformly maintained at a predetermined extinguishing agent concentration in a short time. You will be able to reach it and extinguish the fire.

The gas fire extinguishing system of the present invention discharges extinguishing gas as an extinguishing agent into the space within the fire extinguishing area of a building when a fire occurs, thereby sufficiently dispersing the extinguishing gas and extinguishing the fire even in a large fire extinguishing area. It can be widely implemented to

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space within a fire extinguishing target section in a building, the fire extinguishing gas injection device comprising an injection head 100 and discharge of extinguishing gas from the injection head 100. The sound damping means 102 includes a second sound deadening member 108 as a first sound deadening member provided on the side of the jetting head 100, and a second sound deadening member 108 provided on the downstream side of the first sound deadening member. A second sound deadening material 108 is provided as a second sound deadening member, and each of the first and second sound deadening members is formed into a flat plate shape and made of a porous material through which gas can flow. Become. The first and second sound deadening members are stacked to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surfaces of the first and second sound deadening members are exposed to the atmosphere. It further includes a holding member 128 as a ring member for fixing the second sound deadening member. The silencing means has a first silencing material 113 as a first silencing means located on the upstream side and a second silencing material 108 as a second silencing means located on the downstream side. A rectifying member as an intermediate member through which gas can flow is arranged between the second silencing means and the second silencing means.

Since the sound deadening member is formed into a flat plate shape, the sound deadening member is easily bent. As a result, damage to the sound deadening member can be prevented.

FIG. 10 is a perspective view showing a part of the configuration of a gas fire extinguishing device according to an embodiment of the present invention, including an injection head 200 and a muffling means 202. The gas fire extinguishing system of the present embodiment is installed in a fire extinguishing target section of a building, and the jet head 200 is connected to an injection head 200 that injects high-pressure extinguishing gas toward a space within the fire extinguishing target section. A conduit 14 that guides high-pressure extinguishing gas to the conduit 200, an extinguishing gas supply source 15 that supplies high-pressure extinguishing gas to the conduit 14, and injection from a nozzle hole 204 (see FIG. 12 described later) formed in the injection head 200. and a muffling means 202 for attenuating the sound generated due to the injection of extinguishing gas.

The extinguishing gas is realized by non-flammable gases such as _N2 gas, _CO2 gas and halide gas. This type of extinguishing gas can be sufficiently diffused even in large-scale extinguishing areas where the extinguishing gas has a reaching distance of 15 m or more, and the space within the extinguishing area can be uniformly reached to a predetermined concentration of extinguishing agent in a short time. The fire can be extinguished.

The injection head 200 and the muffler 202 constitute a fire extinguishing gas injection section 211 . In such a fire extinguishing gas injection unit 211, fire extinguishing gas is supplied from the fire extinguishing gas supply source 15 to the injection head 200 via the conduit 14. The conduit 14 includes a main pipe 23 connected to a fire extinguishing gas supply source 15, a branch pipe 18 interposed in the main pipe 23, and a branch pipe 19 connected to the branch pipe 18. High pressure extinguishing gas from the gas supply source 15 is directed to the injection head 200 . The conduit 14 is fastened to a base 20 and a bracket 21 with fasteners 22 such as U-bolts, and is installed in the building frame with vibration and displacement suppressed.

FIG. 11 is a perspective view showing the ejection head 200 and the muffling means 202, and FIG. 12 is a sectional view showing the ejection head 200 and the muffling means 202. In a gas-based fire extinguishing equipment that uses fire extinguishing gas, the jetting head 200 having a noise-reducing function is installed on a wall in order to discharge extinguishing gas into a section to be extinguished. 227, and is configured to be removably attached. A nozzle hole 204, which is a choke, is directly formed in the jet head main body 201. Nozzle holes 204 limit the flow rate of extinguishing gas to a desired value.

The ejection head main body 201 has a base 205 and an outward flange 206 connected to the base 205. The base 205 is removably attached to the jet head body 201 by screws 207.

The muffling means 202 is composed of a muffling material 208 made of a porous material through which gas can flow. The sound deadening material 208 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated sound deadening material 208 is approximately cylindrical.

FIG. 13 is a partially enlarged cross-sectional view showing a state in which the guide member 221 is sandwiched between the ejection head main body 201 and the sound deadening material 208. An end surface 220 on one side (the left side in FIGS. 12 and 13) of the sound deadening material 208 is disposed in contact with the annular attachment portion 222 of the guide member 221 and facing the outward flange 206 of the jet head main body 201. . The guide member 221 includes this attachment portion 222 and a short cylindrical guide portion 223 that is continuous with the attachment portion 222 and guides the extinguishing gas.

The peripheral surface 224 and the end surface 225 on the other side (right side in FIG. 12) of the sound deadening material 208 are in contact with the pressing member 228 that fixes the sound deadening material 208 to the outward flange 206 of the jet head main body 201 via the attachment member 227. open to the atmosphere, except for The shaft portion of the attachment member 227 passes through the holding member 228, the sound deadening material 208, and the attachment portion 222 of the guide member 221, and is screwed onto the outward flange 206 of the jet head main body 201.

As shown in FIG. 13, the mounting portion 222 of the guide member 221 fits into a mounting seat 231 formed in an annular recess on the outward flange 206 of the jet head main body 201, and extends radially inward from the mounting seat 231. It protrudes from the end surface 232 (lower side in FIG. 13) by a gap ΔL1.

Referring again to FIG. 12, in the ejection head 200, the ejection head main body 201 has a base 205 and an outward flange 206 continuous to the base 205. A base 205 of the injection head 200 is removably connected to the end 14a of the conduit 14 by a first screw 212 which is a tapered screw.

The ejection head main body 201 is provided on the base 205 of the ejection head main body 201 in a detachable and replaceable manner. Various jet head bodies 201 having different diameters of nozzle holes 204 are individually selected and used depending on the length of the conduit 14 and the like. I will explain the reason. Gas fire extinguishing equipment is designed to quickly fill the space within the area to be extinguished with extinguishing gas while ensuring the large flow rate (for example, 20,000 to 100,000 liters/min) required for its original role of extinguishing fires. The fire extinguishing gas must be constructed so as to ensure a high flow velocity (for example, 100 m/s) and discharge extinguishing gas. For this reason, the Fire Service Act Enforcement Regulations stipulate that the radiation pressure of extinguishing gas from the nozzle hole 204 of the injection head 200 in a gas fire extinguishing system is 1.9 MPa or more, and in practice it is 2 to 3 MPa (≒ 20 to 30 kgf/ cm ² , and even higher, up to about 6 MPa≈60 kgf/cm ² ).

Therefore, the aperture value of the nozzle hole 204 of the injection head 200 is set such that the extinguishing gas injected from the nozzle hole 204 achieves the aforementioned large flow rate, high flow velocity, and high radiation pressure from the extinguishing gas supply source 15 to the injection head. The length of the conduit 14 to the installation location of 200 etc. must be set depending on the conduit resistance.

Therefore, the aperture of the nozzle hole 204 differs depending on the length of the conduit 14, etc. Therefore, various ejection heads 200 with different apertures of the nozzle hole 204 are individually selected and used for each installation location of the ejection head 200. Must. In this way, in a gas fire extinguishing system, various injection heads 200 having different diameters of nozzle holes 204 are essential.

The muffling means 202 includes a muffling material 208, a pressing member 228, and a mounting member 227. The sound deadening material 208 is made of a porous material through which gas can flow, for example, made of porous metal in which fine metal powder or fine metal filaments are sintered, and allows high-pressure extinguishing gas to flow smoothly and slowly. By expanding under reduced pressure, it is possible to effectively achieve a silencing effect without reducing the flow rate. Such a sound deadening material 208 can be used by appropriately selecting a porous material with different void density depending on the flow conditions of the extinguishing gas such as the diameter, length, number, and formation position of the nozzle holes 204. Further, the sound deadening material 208 may be configured by laminating multiple layers of wire mesh, for example, or may be a plate-shaped molded product made of synthetic resin fibers or a porous member.

The sound deadening material 208 is formed in the shape of a flat plate, such as a disk, and a plurality of sheets are stacked one on top of the other. The overall shape of each of the stacked sound deadening materials 208 is, for example, cylindrical. An end surface 220 on one side in the axial direction (left side in FIG. 12) of the laminated sound deadening material 208 is arranged facing, for example, in contact with the ejection head main body 201, and a circumferential surface 224 of the laminated sound deadening material 208 is , open to the atmosphere.

The pressing member 228 presses the end surface 225 on the other side (right side in FIG. 12) of the stacked sound deadening materials 208. The pressing member 228 has a flat plate shape and is made of ring-shaped metal that extends along the peripheral edge of the sound deadening material 208 .

The attachment member 227 is in this embodiment a bolt as a threaded member and is indicated using the same reference numerals. A plurality (for example, three) of the mounting members 227 are arranged axially symmetrically around the axis L203 at equal intervals. The shaft portion of the mounting member 227 is inserted into bolt insertion holes formed in the holding member 228 and the sound deadening material 208, respectively, and the head of the mounting member 227 is inserted into the holding member 228 on the opposite side of the sound deadening material 208 (FIG. 12). (on the right side). A male thread formed on the shaft portion of the attachment member 227 is removably screwed into a female thread formed in an open hole in the outward flange 206 of the injection head body 201. As a result, the mounting member 227 clamps and fixes the stacked sound deadening material 208 between the outward flange 206 and the pressing member 228.

Each axis of the attachment member 227 is parallel to the axis L103 of the end 14a of the conduit 14. The axes of the end 14a of the conduit 14, the jetting head 200, and the muffling means 202 are on a straight line. With the muffling means 202 attached to the ejection head 200, the workability of connecting the base 205 of the ejection head main body 201 to the end 14a of the conduit 14 using the first screw 212 is good.

The axis L103 of the end 14a of the conduit 14 is aligned with the axes of the ejection head 200 including the ejection head main body 201, the sound deadening material 208, and the pressing member 228. Therefore, the workability of the connection between the end 14a of the conduit 14 and the base 205 of the ejection head main body 201 using the first screw 212 and the connection between the ejection head main body 201 and the nozzle member 234 using the second screw 207 is good. . This good connection workability means that, in many cases, the injection head 200 and the silencing means 202 are located in a section of the building to be extinguished, in a place that does not pose an obstacle to the movement of people, such as on a ceiling that is higher than the person's height. This is important considering that it will be connected to places such as

When extinguishing a fire, the high-pressure fire extinguishing gas injected through the nozzle hole 204 gradually passes through the fine voids of the sound deadening material 208, decompresses and expands smoothly, reducing the generation of sound. It is suppressed and sprayed into the space within the fire extinguishing section of the building. The extinguishing gas from the circumferential surface 224 of the sound deadening material 208 is injected horizontally and radially near the ceiling, and can be uniformly and quickly diffused throughout the space within the section to be extinguished. Therefore, it is possible to quickly extinguish the fire in the area to be extinguished.

This sound deadening material 208 makes it possible to attenuate the sound caused by the jet stream of fire extinguishing gas from the jet head while reducing the size of the configuration, and allows the jetting and sound deadening characteristics to be precisely adjusted without reducing the flow rate of the fire extinguishing gas. A great sound reduction effect can be achieved.

In the above-described embodiment, the silencing means 202, which has a more complicated configuration than the ejection head 200, can be attached to and removed from various types of ejection heads 200 with different diameters of the nozzle holes 204 using the mounting member 227, so that the silencing member 208 can be commonly used for various types of ejection heads 200. This common use facilitates mass production of the sound deadening material 208 and improves productivity.

In addition, depending on whether or not there is a need for silencing in the fire extinguishing area, individual selection and use is easily possible. Simplification can be achieved. Furthermore, the silencing means 202 that has been removed from a fire extinguishing area where there is no longer a need for sound silencing can be attached to another fire extinguishing area where noise should be silenced and reused. will be promoted.

In other embodiments of the invention, the jetting head 200 and the muffling means 202 may be constructed integrally, ie non-removably. In this embodiment, the base 205 of the ejection head main body 201 is detachably provided at the end 14a of the conduit 14 by means of a first screw 212, and various ejection heads 200 having different diameters of the nozzle holes 204 can be individually installed. It may be used selectively.

Further, the ejection head 200 and the nozzle member 234 are connected in advance with the second screw 207 to form an assembly, and then the base 205 of the ejection head main body 201 in this assembly is connected to the end 14a of the conduit 14. The workability of connecting by the first screw 212 is also good.

Further, in order to make the existing fire extinguishing target section, in which the base 205 of the jet head main body 201 is connected to the end 14a of the conduit 14 by the first screw 212, into a fire extinguishing target section to be silenced, the jet head main body 201 is When the silencing means 202 is connected by the mounting member 227, the workability of the connection is also good.

A gap 215 having a distance ΔL2 in the direction of the axis L203 exists between the end surface of the sound deadening material 208 facing the nozzle hole 204 and the end surface of the jet head main body 201 facing the sound deadening material 208. When fire extinguishing gas is injected from the nozzle hole 204, fine foreign matter is stored and stored in the gap, so that it is possible to prevent the nozzle hole 204 from being clogged by foreign matter, and also to reduce noise caused by clogging of the foreign matter. It is possible to prevent a decrease in the flow rate during generation and release.

Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit is a plated tube, rust, and sealing materials used in pipe fittings. Such as debris. In addition, by reducing the pressure inside the injection head 100 and releasing the extinguishing gas radially outward, the injection reaction force that acts from the injection head 100 backwards (to the left in FIG. 12) on the conduit 14 when extinguishing the extinguishing gas is reduced. It can be reduced to about 1/9 of the conventional technology shown in FIG.

In another embodiment of the present invention, the end face of the sound deadening material 208 in the above-described embodiment is arranged on the nozzle hole 204 side, and the end face of the ejection head main body 201 is arranged opposite to the sound deadening material 208. The inventor of the present invention has confirmed that the silencing effect does not decrease even if the space is spaced apart. The experiment and its results will be described below with reference to FIGS. 14 and 15.

FIG. 14 is a cross-sectional view showing the ejection head 500 and the muffling means 502, 502a tested by the inventor of the present invention. In FIG. 14(1), extinguishing gas, which is N ₂ gas, from conduit 514 is injected from nozzle hole 504 of injection head 500 .

Eleven sheets of sound deadening material 508 are stacked and housed in a right cylindrical housing 551 of the sound deadening means 502 attached to the ejection head 500. The extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 552 of the housing 551 into the space within the section to be extinguished. The sound deadening material 508 closely contacts the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500 .

The supply pressure of the extinguishing gas supplied from the conduit 514 to the injection head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is approximately 55 m ³ /min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 is, for example, 3 MPa to 7 MPa. is approximately 60 to 100 m/sec. The porosity of the sound deadening material 508 used in this experiment was approximately 97%, the diameter was approximately 130 mm, and the thickness was 10 mm/sheet.

In FIG. 14(2), the silencing material 508 of the silencing means 502a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500, and the other configuration is as shown in FIG. 14(2). This is the same as 1).

FIG. 15 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention discharged extinguishing gas using the configuration shown in FIG. 14. Line 554 is the result of an experiment in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 14(1), and line 555 is the result of an experiment as shown in FIG. These are experimental results based on a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, it was found that according to the configuration in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 14 (1)), the configuration in which the sound deadening material 508 is arranged with a gap 553 (FIG. 14 It was confirmed that a large noise reduction effect of approximately 16 dB was obtained compared to (2)). Therefore, it has been confirmed that according to the embodiment in which the end face of the sound deadening material 508 facing the nozzle hole 504 and the end face facing the sound deadening material 508 of the ejection head 500 are brought into close contact with each other, the sound deadening effect is improved. It was done.

Therefore, as in the embodiments shown in FIGS. 10 to 13, a gap 215 is provided between the end surface of the sound deadening material 208 facing the nozzle hole 204 and the end surface of the jet head main body 201 facing the sound deadening material 208. At this time, by setting the distance ΔL2 in the direction of the axis L203 within a range that does not reduce the sound deadening effect, for example, 0.1 mm to 1.5 mm, clogging of the sound deadening material 208 due to foreign objects can be prevented without substantially reducing the sound deadening effect. It can be prevented.

FIG. 16 is a sectional view showing a gas fire extinguishing device according to another embodiment of the present invention. In the muffling means 600 of this gas fire extinguishing system, the above-mentioned guide member 221 is omitted. The function of the guide member 221 will be explained with reference to FIG. 16.

The extinguishing gas from each of the plurality of nozzle holes 609 is uniformly distributed over the entire surface of the nozzle portion 608 corresponding to the above-mentioned flat plate-shaped end wall 241 of the jet head main body 601, and the extinguishing gas flows in parallel to each other of the nozzle holes 609. The sound absorbing material 613 is injected along the axis of the nozzle hole 609, and gradually passes through the fine gaps of the sound deadening material 613 located downstream of the nozzle hole 609, and is decompressed and expanded. The respective axes of the jet head main body 601 and the sound deadening material 613 are on a straight line. The minute voids in the sound deadening material 613 give a pressure loss to the extinguishing gas passing through them.

Assuming that the path followed by the extinguishing gas injected into the sound deadening material 613 from the nozzle hole 609 is a straight line for the sake of simplification, the path taken by the fire extinguishing gas injected into the sound deadening material 613 from the nozzle portion 608 to the sound deadening material 613 whose overall shape is approximately a right circular column is assumed to be straight. The path length to the most downstream end face is indicated by reference numeral L601 in FIG.

The path length from the side of the nozzle portion 608 to the circumferential surface of the sound deadening material 613 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of extinguishing gas injected from the nozzle part 608, if the outer diameter of the nozzle part 608 is made relatively larger than the length of the sound deadening material 613 in the axial direction, L601>L602.

The pressure loss acting on the fire extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of pressure loss in the sound deadening material 613 is as shown by the isobar line 603 connecting positions where the same pressure loss occurs. The pressure loss is greatest in the region on the axis of the sound deadening material 613, and decreases as the peripheral region moves away from the axis. Since the extinguishing gas injected from the nozzle portion 608 tends to flow into an area where the pressure loss is small, the extinguishing gas in the sound deadening material 613 is directed in the axial direction of the injection head body 601 as indicated by the imaginary line reference numeral 604. , and to the side, as indicated by reference numeral 605 , and also to the rear, as indicated by reference numeral 606 . The lengths of reference numerals 604, 605, 606 are shown corresponding to the flow rate of the extinguishing gas, with a relatively large flow of extinguishing gas flowing in said side and rear directions. In order to quickly fill the fire extinguishing target compartment with fire extinguishing gas, from among the plurality of sound deadening materials 613 installed near the wall surface (on the left side in FIG. The extinguishing gas is injected in the direction indicated by reference numeral 604 and laterally in the direction indicated by reference numeral 605 at as large a flow rate as possible, and the flow rate of the extinguishing gas traveling toward the rear as indicated by reference numeral 606 is suppressed. There must be.

In each of the embodiments described above in connection with FIGS. 10 to 16 of the present invention, the guide member 221 is configured to control the extinguishing gas that is injected from the sound deadening material 613 and advances in the rear direction 606 in FIG. 16. This prevents the jet from moving in the axial direction 604 and sideways 605 of the jet head main body 601. As a result, even in large-scale extinguishing areas where the extinguishing gas reach distance is 15 meters or more, the extinguishing gas can be sufficiently diffused and the space within the extinguishing area can be uniformly maintained at a predetermined extinguishing agent concentration in a short time. You will be able to reach it and extinguish the fire.

The gas fire extinguishing system of the present invention discharges extinguishing gas as an extinguishing agent into the space within the fire extinguishing area of a building when a fire occurs, thereby sufficiently dispersing the extinguishing gas and extinguishing the fire even in a large fire extinguishing area. It can be widely implemented to

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space within a fire extinguishing target section in a building, the fire extinguishing gas injection device comprising an injection head 100 and discharge of extinguishing gas from the injection head 100. The sound damping means 202 includes a sound deadening member 208 as a first sound deadening member provided on the ejection head 100 side, and a sound deadening member 208 provided on the downstream side of the first sound deadening member. Each of the first and second sound damping members is formed into a flat plate shape and is made of a porous material through which gas can flow. The first and second sound deadening members are stacked to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surfaces of the first and second sound deadening members are exposed to the atmosphere. It further includes a pressing member 228 as an annular member that fixes the second sound deadening member.

FIG. 17 is a perspective view showing a part of the configuration of a gas fire extinguishing device according to an embodiment of the present invention, including an injection head 300 and a silencing means 302. The gas fire extinguishing system of the present embodiment is installed in a fire extinguishing section of a building, and the jet head 300 is connected to an injection head 300 that injects high-pressure extinguishing gas toward the space inside the fire extinguishing section. A conduit 314 that guides high-pressure extinguishing gas to the conduit 300, an extinguishing gas supply source 315 that supplies high-pressure extinguishing gas to the conduit 314, and a nozzle hole 304 formed in the injection head 300 (see FIG. 19 described later). It includes a muffling means 302 for attenuating the sound generated due to the jetting of the extinguishing gas.

The extinguishing gas is realized by an inert gas such as _N2 gas and _CO2 gas or an active gas such as a halide gas. This type of extinguishing gas can be sufficiently diffused even in large-scale extinguishing areas where the extinguishing gas has a reaching distance of 15 m or more, and the space within the extinguishing area can be uniformly reached to a predetermined concentration of extinguishing agent in a short time. The fire can be extinguished.

The injection head 300 and the muffler 302 constitute a fire extinguishing gas injection section 311 . In such a fire extinguishing gas injection unit 311, the fire extinguishing gas is supplied from the fire extinguishing gas supply source 315 to the injection head 300 via the conduit 314. The conduit 314 includes a main pipe 323 connected to a fire extinguishing gas supply source 315, a branch pipe 318 interposed in the main pipe 323, and a branch pipe 319 connected to the branch pipe 318. High pressure extinguishing gas from a gas supply 315 is directed to the injection head 300 . The conduit 314 is fastened to a base 316 and a bracket 321 with fasteners 322 such as U bolts, and is installed in the building frame with vibration and displacement suppressed.

FIG. 18 is a perspective view showing the ejection head 300 and the muffling means 302, and FIG. 19 is a sectional view showing the ejection head 300 and the muffling means 302. The injection head 300 is installed on the ceiling in order to discharge extinguishing gas into a space within a section to be extinguished in a gas-based fire extinguishing system that uses extinguishing gas. The ejection head 300 includes an ejection head main body 301 and a nozzle member 339. A muffling means 302 is attached to the ejection head main body 301 .

In the ejection head 300, the ejection head main body 301 has a base portion 337 and an outward flange 338 continuous to the base portion 337. A base 337 of the injection head 300 is removably connected to the end 303 of the conduit 314 by a first screw 312 that is a tapered screw.

The nozzle member 339 has a cylindrical portion 340 and an end wall 341. The cylindrical portion 340 extends along the vertical axis L303 of the end portion 303 of the conduit 314. This cylindrical portion 340 is connected to a peripheral wall 342 in which a plurality of nozzle holes 304 are formed and one end in the axial direction of the peripheral wall 342 (upper part of FIG. 19), and can be attached to and removed from the base 337 of the jet head main body 301 with a second screw. and a proximal end 306 connected to the base end 306 . The end wall 341 closes the other end of the peripheral wall 342 in the axial direction (lower side in FIG. 19). Nozzle holes 304 limit the flow rate of extinguishing gas to a desired value.

The base end 306 of the nozzle member 339 is detachably provided on the base 337 of the ejection head main body 301. Various nozzle members 339 having different diameters of nozzle holes 304 are individually selected and used depending on the length of the conduit 314 and the like. I will explain the reason. Gas fire extinguishing equipment is designed to quickly fill the space within the area to be extinguished with extinguishing gas while ensuring the large flow rate (for example, 20,000 to 100,000 liters/min) required for its original role of extinguishing fires. The fire extinguishing gas must be constructed so as to ensure a high flow velocity (for example, 100 m/s) and discharge extinguishing gas. For this reason, the Fire Service Act Enforcement Regulations stipulate that the radiation pressure of extinguishing agent gas from the nozzle hole 304 of the injection head 300 in a gas fire extinguishing system is 1.9 MPa or more, and in practice it is 2 to 3 MPa (≒ 20 to 30 kgf The radiation pressure is carried out at a high radiation pressure of 6 MPa≈60 kgf/cm ² (up to about 6 MPa≈60 kgf/cm ² ).

Therefore, the aperture value of the nozzle hole 304 of the injection head 300 is set such that the extinguishing agent gas injected from the nozzle hole 304 is injected from the extinguishing gas supply source 315 so as to achieve the aforementioned large flow rate, high flow velocity, and high radiation pressure. The length of the conduit 314 to the installation location of the head 300, etc., must be set depending on the conduit resistance. Therefore, the aperture of the nozzle hole 304 differs depending on the length of the conduit 314, etc. Therefore, various ejecting heads 300 with different apertures of the nozzle hole 304 are individually selected and used for each installation location of the ejecting head 300. Must. In this way, in a gas fire extinguishing system, various injection heads 300 having different diameters of nozzle holes 304 are essential.

The muffling means 302 includes a muffling material 308, a pressing member 328, and a mounting member 327. The sound deadening material 308 is made of a porous material through which gas can flow, for example, made of a porous metal in which fine metal powder or fine metal filaments are sintered, or made of, for example, a plurality of layers of wire mesh laminated. It may be made of synthetic resin. Such a sound deadening material 308 can be used by appropriately selecting a porous material with different void density depending on the flow conditions of the extinguishing gas such as the diameter, length, number, and formation position of the nozzle holes 304.

The sound deadening material 308 is formed in the shape of a flat plate, such as a disk, and a plurality of sheets are laminated. The overall shape of the laminated sound deadening material 308 is, for example, cylindrical. An end surface 320 on one axial side (upper side in FIG. 19) of the laminated sound deadening material 308 is arranged facing, for example, in contact with, the lower surface of the outward flange 338 of the ejection head main body 301 in FIG. A peripheral surface 324 of the sound deadening material 308 is exposed to the atmosphere. The sound deadening material 308 is formed with an insertion hole 310 through which the cylindrical portion 340 of the nozzle member 339 is inserted.

The pressing member 328 presses the end surface 325 on the other side (lower side in FIG. 19) of the laminated sound deadening material 308. The pressing member 328 has a flat plate shape and has a circumferential surface extending along the circumferential surface 324 of the sound deadening material 308 .

The mounting member 327 is, in this embodiment, a bolt as a threaded member and is indicated using the same reference numeral. A plurality of bolts 327 (for example, six) are arranged at equal intervals around the axis L303. The shaft portion of the bolt 327 is inserted into the bolt insertion hole formed in the holding member 328 and the sound deadening material 308, and the head of the bolt 327 is inserted into the holding member 328 on the opposite side of the sound deadening material 308 (lower side in FIG. 19). ). A male thread formed on the shaft portion of the bolt 327 is removably screwed into a female thread formed in an outward flange 338 . Thereby, the bolts 327 clamp and fix the stacked sound deadening material 308 between the outward flange 338 and the pressing member 328.

Each axis of bolt 327 is parallel to axis L303 of end 303 of conduit 314. The axes of the end 303 of the conduit 314, the injection head 300, and the muffling means 302 are in a straight line. The workability of connecting the base 337 of the ejection head main body 301 to the end 303 of the conduit 314 with the first screw 312 with the muffling means 302 attached to the ejection head 300 is good.

The axis L303 of the end 303 of the conduit 314 is aligned with the axes of the ejection head 300 including the ejection head main body 301 and the nozzle member 339, the sound deadening material 308, and the pressing member 328. Therefore, the end 303 of the conduit 314 and the base 337 of the ejection head main body 301 are connected by the first screw 312, and the base 337 of the ejection head main body 301 and the base end 306 of the nozzle member 339 are connected by the second screw 307. The workability is good. This good connection workability means that, in many cases, the injection head 300 and the silencing means 302 are located in a section of the building to be extinguished, in a place that does not pose an obstacle to the movement of people, such as on a ceiling that is higher than the person's height. This is important considering that it will be connected to places such as

When extinguishing a fire, the high-pressure extinguishing gas injected through the nozzle hole 304 gradually passes through the fine voids of the sound-absorbing material 308, depressurizes and expands smoothly, reducing the generation of sound. It is suppressed and sprayed into the space within the fire extinguishing section of the building. The extinguishing gas from the circumferential surface 324 of the sound deadening material 308 is injected horizontally and radially near the ceiling, and can be uniformly and quickly diffused throughout the space within the section to be extinguished. Therefore, it is possible to quickly extinguish the fire in the area to be extinguished.

With this sound deadening material 308, it is possible to achieve a large sound reduction effect while downsizing the configuration.

In the embodiment described above, the silencing means 302, which has a more complicated configuration than the ejection head 300, can be attached to and removed from various types of ejection heads 300 with different diameters of the nozzle holes 304 using the bolts 327. , can be commonly used for various types of ejection heads 300. This common use facilitates mass production of the muffling means 302 and improves productivity.

In addition, depending on whether or not there is a need for silencing in the fire extinguishing area, individual selection and use is easily possible. Simplification can be achieved. Furthermore, the silencing means 302 removed from a fire extinguishing area where the need for sound silencing is no longer required can be attached to another fire extinguishing area for reuse, which is economical and saves energy. will be promoted.

In other embodiments of the invention, the jetting head 300 and the muffling means 302 may be configured integrally, ie non-removably. In this embodiment, the base 337 of the ejection head main body 301 is detachably provided at the end 303 of the conduit 314 with a first screw 312, and various ejection heads 300 having different diameters of the nozzle holes 304 can be individually connected. You may choose to use it.

In addition, the ejection head 300 and the silencing means 302 are connected in advance by the second screw 307 and the mounting member 327 to form an assembly, and then the base 337 of the ejection head main body 301 in this assembly is connected to the end of the conduit 314. The workability of connecting the first screw 312 to the portion 303 is also good.

Furthermore, in order to make the existing fire extinguishing target section, in which the base 337 of the jet head main body 301 is connected to the end 303 of the conduit 314 by the first screw 312, into a fire extinguishing target compartment that should be silenced, the outer part of the jet head main body 301 is When the silencing means 302 is connected to the orientation flange 338 by the mounting member 327, the workability of the connection is also good.

A gap exists between the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outer peripheral surface of the cylindrical portion 340 of the nozzle member 339. When extinguishing gas is injected from the nozzle hole 304, fine foreign matter is stored and stored in the gap, so that it is possible to prevent the nozzle hole 304 from being clogged by foreign matter, and also to reduce noise caused by clogging of foreign matter. It is possible to prevent a decrease in the flow rate during generation and release.

Foreign matter is present in the conduit 314, such as scale and slag from welding in the conduit 314, peeled pieces of the plating layer in the plated tube when the conduit is a plated tube, rust, and sealing materials used in pipe fittings. Such as debris. In addition, by reducing the pressure inside the injection head 100 and releasing the extinguishing gas radially outward, the injection reaction force that acts from the injection head 100 backwards (to the left in FIG. 19) on the conduit 14 when extinguishing the extinguishing gas is reduced. It can be reduced to about 1/9 of the conventional technology shown in FIG.

In another embodiment of the present invention, the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the nozzle member 33
The outer circumferential surface of the cylindrical portion 340 of No. 9 is in close contact. The inventor of the present invention has confirmed that this configuration improves the silencing effect. The experiment and its results will be described below with reference to FIGS. 20 and 21.

FIG. 20 is a sectional view showing the injection nozzle 500 and the muffling means 502, 502a tested by the inventor of the present invention. In FIG. 20(1), extinguishing gas, which is N ₂ gas, from conduit 514 is injected from nozzle hole 504 of injection head 500 . Inside the right cylindrical housing 551 of the sound damping means 502 attached to the jetting head 500, eleven sheets of sound deadening material 508 are packed and housed. The extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 52 of the housing 551 into the space within the section to be extinguished. The sound deadening material 508 closely contacts the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500 .

The supply pressure of the extinguishing gas supplied from the conduit 514 to the injection nozzle 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is approximately 55 m ³ /min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 is, for example, 3 MPa to 7 MPa. is approximately 60 to 100 m/sec. The porosity of the sound deadening material 508 used in this experiment was approximately 97%, the diameter was approximately 130 mm, and the thickness was 10 mm/sheet.

In FIG. 20(2), the sound deadening material 508 of the sound deadening means 500a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500, and the other configuration is as shown in FIG. ).

FIG. 21 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention discharged extinguishing gas using the configuration of FIG. 20. Line 554 is the result of an experiment in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 20(1), and line 555 is the result of an experiment in FIG. These are the experimental results for a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, it was found that the structure in which the sound deadening material 508 was placed in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 20 (1)) was different from the structure in which it was arranged with a gap 553 (see FIG. 20). It was confirmed that a large noise reduction effect of approximately 12 dB was obtained compared to (2)). Therefore, it has been found that according to the embodiment in which the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outer peripheral surface of the cylindrical portion 340 of the nozzle member 339 are brought into close contact with each other, the sound deadening effect is improved. Ta.

Therefore, as in the embodiments of FIGS. 17 to 20, a gap 315 is provided between the end surface of the sound deadening material 308 facing the nozzle hole 304 and the end surface of the jet head main body 301 facing the sound deadening material 308. At this time, by setting the interval in the direction of the axis L303 within a range where the above-mentioned sound deadening effect does not deteriorate, for example, 0.1 mm to 1.5 mm, clogging of the sound deadening material 308 by foreign objects can be prevented without substantially reducing the sound deadening effect. can do.

The gas fire extinguishing system of the present invention discharges extinguishing gas as an extinguishing agent into the space within the fire extinguishing area of a building when a fire occurs, thereby sufficiently dispersing the extinguishing gas and extinguishing the fire even in a large fire extinguishing area. It can be widely implemented to

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space within a fire extinguishing target section in a building, the fire extinguishing gas injection device comprising an injection head 300 and discharge of extinguishing gas from the injection head 300. The sound damping means 302 includes a sound deadening member 308 as a first sound deadening member provided on the side of the jetting head 300, and a sound deadening member 308 provided on the downstream side of the first sound deadening member. Each of the first and second sound damping members is formed into a flat plate shape and is made of a porous material through which gas can flow. The first and second sound deadening members are stacked to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surfaces of the first and second sound deadening members are exposed to the atmosphere. It further includes a plate-shaped holding member 328 for fixing the second sound deadening member.

FIG. 22 is a perspective view showing a part of the configuration of a gas fire extinguishing system according to an embodiment of the present invention, including an injection head 400 and a silencing means 402. The gas fire extinguishing system of the present embodiment is installed on a wall in a fire extinguishing section of a building, and the jet head 400 is connected to a jetting head 400 that injects high-pressure extinguishing gas toward a space inside the fire extinguishing section. A conduit 14 that guides high-pressure extinguishing gas to the injection head 400, an extinguishing gas supply source 15 that supplies high-pressure extinguishing gas to the conduit 14, and a nozzle hole 404 formed in the injection head 400 (see FIG. 24 described later). It includes a muffling means 402 for attenuating the sound generated due to the injection of extinguishing gas injected from the fire extinguishing gas.

The extinguishing gas is realized by non-flammable gases such as _N2 gas, _CO2 gas and halide gas. This type of extinguishing gas can be sufficiently diffused even in large-scale extinguishing areas where the extinguishing gas has a reaching distance of 15 m or more, and the space within the extinguishing area can be uniformly reached to a predetermined concentration of extinguishing agent in a short time. The fire can be extinguished.

The injection head 400 and the muffler 402 constitute a fire extinguishing gas injection section 411 . In such a fire extinguishing gas injection unit 411, fire extinguishing gas is supplied from the fire extinguishing gas supply source 15 to the injection head 400 via the conduit 14. The conduit 14 includes a main pipe 23 connected to a fire extinguishing gas supply source 15, a branch pipe 18 interposed in the main pipe 23, and a branch pipe 19 connected to the branch pipe 18. High pressure extinguishing gas from the gas supply source 15 is directed to the injection head 400 . The conduit 14 is fastened to a base 20 and a bracket 21 with fasteners 22 such as U-bolts, and is installed in the building frame with vibration and displacement suppressed.

FIG. 23 is a perspective view showing the ejection head 400 and the muffling means 402, and FIG. 24 is a cross-sectional view showing the ejection head 400 and the muffling means 402. An injection head 400 having a noise-reducing function is installed on a wall in order to emit extinguishing gas to a section to be extinguished in a gas-based fire extinguishing equipment that uses extinguishing gas, and a noise-reducing means 402 is attached to an injection head main body 401 using an auxiliary member 403. composed of

The auxiliary attachment member 403 has a base 405 and an outward flange 406 connected to the base 405 . The base portion 405 is detachably attached to the ejection head main body 401 by screws 407. A nozzle member 409 in which a nozzle hole 404, which is a choke, is formed is removably attached to the attachment auxiliary member 403 with a screw 410. Nozzle hole 404 limits the flow rate of extinguishing gas to a desired value.

The muffling means 402 is composed of a muffling material 408 made of a porous material through which gas can flow. The sound deadening material 408 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated sound deadening material 408 is approximately cylindrical. Such a sound deadening material 408 is made by appropriately selecting a porous material with different void density depending on the flow conditions of the extinguishing gas, such as the diameter and length of the nozzle holes 404, the number of the nozzle holes 404, and the formation position. Can be used.

In the nozzle member 409 , a gap 415 is formed between the end face of the exit part of the nozzle hole 404 and the sound deadening material 408 to hold and store foreign matter such as minute rust coming from the nozzle hole 404 . prevent clogging caused by foreign matter.

An end surface 420 on one side (left side in FIGS. 24 and 25) of the sound deadening material 408 is connected to a guide member 421.
It is disposed in contact with the annular attachment portion 422 of the auxiliary attachment member 403 and facing the outward flange 406 of the attachment auxiliary member 403 . The guide member 421 includes this attachment portion 422, a short cylindrical guide portion 423 that is connected to the attachment portion 422 and guides the extinguishing gas, and an expanded portion 443, which will be described later.

The end surface 425 on the other side (the right side in FIGS. 24 and 25) of the sound deadening material 408 is a ring-shaped retainer that fixes the sound deadening material 408 to the outward flange 406 of the mounting auxiliary member 403 via a mounting member 427 such as a bolt. Except for the portion in contact with member 428, it is exposed to the atmosphere. The shaft portion of the attachment member 427 passes through the holding member 428, the sound deadening material 408, and the attachment portion 422 of the guide member 421, and is screwed onto the outward flange 406 of the attachment auxiliary member 403.

A circumferential surface 424 of the sound deadening material 408 is closely surrounded by a short cylindrical, more specifically cylindrical, inner circumferential surface of the guide portion 423 of the guide member 421 . The guide portion 423 is formed so that the expanded portion 443 is located downstream of the pressing member 428 in the extinguishing gas injection direction and expands outward in the radial direction as it moves away from the presser member 428, that is, in a substantially truncated conical shape.

Since the guide member 421 has the widening portion 443, the extinguishing gas released from the other axial end face of the sound deadening material 408 will diffuse outward in the radial direction with respect to the axis L403 of the injection head 400 immediately after being released. The fire extinguishing gas can be suppressed, the extinguishing gas can reach a long distance, and the required amount of extinguishing gas can be released within the area to be extinguished.

As shown in FIG. 25, the mounting portion 422 of the guide member 421 fits into a mounting seat 431 formed in an annular recess on the outward flange 406 of the mounting auxiliary member 403, and is located radially inward from the mounting seat 431. It protrudes from the end surface 432 (lower side in FIG. 25) by a gap ΔL4.

An end surface 420 on one side (the left side in FIGS. 24 and 25) of the sound deadening material 408 is disposed in contact with the annular attachment portion 422 of the guide member 421 and facing the outward flange 406 of the attachment auxiliary member 403, An end surface 420 on one side (the left side in FIGS. 24 and 25) of the sound deadening material 408 has a gap ΔL4 with the end surface 432 of the outward flange 406 of the mounting auxiliary member 403, and is therefore disposed in contact with the jet head main body 401. It is not a configured configuration.

The auxiliary attachment member 403 has a base 405 and an outward flange 406 connected to the base 405 . The base 405 is removably attached to the jet head body 401 by screws 407.

The muffling means 402 is composed of a muffling material 408 made of a porous material through which gas can flow. The sound deadening material 408 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated sound deadening material 408 is approximately cylindrical.

A nozzle member 409 is attached to the attachment auxiliary member 403 with screws 410. The nozzle member 409 has a nozzle hole 404 that is a choke.

FIG. 25 is a partially enlarged sectional view showing a state in which the guide member 421 is sandwiched between the auxiliary attachment member 403 and the sound deadening material 408. An end surface 420 on one side (the left side in FIGS. 24 and 25) of the sound deadening material 408 is disposed in contact with the annular attachment portion 422 of the guide member 421 and facing the outward flange 406 of the attachment auxiliary member 403. . The guide member 421 includes this attachment portion 422 and a short cylindrical guide portion 423 that is connected to the attachment portion 422 and guides the extinguishing gas.

A circumferential surface 424 and an end surface 425 on the other side (right side in FIGS. 23 and 24) of the sound deadening material 408 are attached to a holding member 428 that fixes the sound deadening material 408 to the outward flange 406 of the mounting auxiliary member 403 via the mounting member 427. It is open to the atmosphere except for the part in contact with the Mounting member 42
The shaft portion 7 passes through the holding member 428, the sound deadening material 408, and the mounting portion 422 of the guide member 421, and is screwed onto the outward flange 406 of the mounting auxiliary member 403.

As shown in FIG. 25, the mounting portion 422 of the guide member 421 fits into a mounting seat 431 formed in an annular recess on the outward flange 406 of the mounting auxiliary member 403, and is located radially inward from the mounting seat 431. It protrudes in the axial direction from the end surface 432 (lower side in FIG. 25) by a gap ΔL1.

Referring again to FIG. 24, in the ejection head 400, the ejection head main body 401 has a substantially cylindrical base portion 437 and a hooking portion 438 continuous to the outer periphery of the base portion 437. A hooking portion 438 of the injection head 400 is removably connected to the end 14a of the conduit 14 by a first screw 412 which is a tapered screw.

The attachment auxiliary member 403 is removably provided on the base 437 of the ejection head main body 401. Various jet head bodies 401 having different diameters of nozzle holes 404 are individually selected and used depending on the length of the conduit 14 and the like. I will explain the reason.

Gas fire extinguishing equipment is designed to quickly fill the space within the area to be extinguished with extinguishing gas while ensuring the large flow rate (for example, 20,000 to 100,000 liters/min) required for its original role of extinguishing fires. The fire extinguishing gas must be constructed so as to ensure a high flow velocity (for example, 100 m/s) and discharge extinguishing gas. For this reason, the Fire Service Act Enforcement Regulations stipulate that the radiation pressure of extinguishing gas from the nozzle hole 404 of the injection head 400 in a gas fire extinguishing system is 1.9 MPa or more, and in practice, it is 2 to 3 MPa (≒ 20 to 30 kgf/ cm ² , and even higher, up to about 6 MPa≈60 kgf/cm ² ).

Therefore, the aperture value of the nozzle hole 404 of the injection head 400 is set such that the extinguishing gas injected from the nozzle hole 404 achieves the aforementioned large flow rate, high flow velocity, and high radiation pressure from the extinguishing gas supply source 15 to the injection head. The length of the conduit 14 to the installation location of 400 etc. must be set depending on the conduit resistance.

Therefore, the aperture of the nozzle hole 404 differs depending on the length of the conduit 14, etc. Therefore, various ejection heads 400 with different apertures of the nozzle hole 404 are individually selected and used for each installation location of the ejection head 400. Must. In this way, in a gas fire extinguishing system, various injection heads 400 having different diameters of nozzle holes 404 are essential.

The sound deadening means 402 includes a plurality of sound deadening materials 408 , a pressing member 428 , and a mounting member 427 . The sound deadening material 408 is made of a porous material through which gas can flow, for example, made of a porous metal in which fine metal powder or fine metal filaments are sintered, and allows high-pressure extinguishing gas to flow smoothly and slowly. The sound deadening material 408 can effectively achieve a sound deadening effect without reducing the flow rate by expanding under reduced pressure, and may be constructed by laminating multiple layers of wire mesh, for example, and may be a board made of synthetic resin fibers. It may be a shaped molded product or a porous member.

The sound deadening material 408 is formed in the shape of a flat plate, such as a disk, and a plurality of sheets are stacked one on top of the other. The overall shape of each of the stacked sound deadening materials 408 is, for example, cylindrical. The circumferential surface 424 of the laminated sound deadening material 408 is closely surrounded by the cylindrical inner circumferential surface of the guide portion 423 of the guide member 421, and therefore is not exposed to the atmosphere.

The pressing member 428 presses the end surface 425 on the other side (right side in FIG. 24) of the stacked sound deadening material 408. The pressing member 428 has a flat plate shape and has a circumferential surface 426 extending along the circumferential surface 424 of the sound deadening material 408 .

The mounting member 427 is in this embodiment a bolt as a threaded member and is indicated using the same reference numeral. A plurality of attachment members 427 (for example, 6) are arranged at equal intervals around the axis L403. The shaft portion of the mounting member 427 is inserted into bolt insertion holes formed in the holding member 428 and the sound deadening material 408, respectively, and the head of the mounting member 427 is inserted into the holding member 428 on the opposite side of the sound deadening material 408 (FIG. 24). (on the right side).

The male thread formed on the shaft portion of the attachment member 427 is removably screwed into a female thread formed in an open hole in the outward flange 406 of the attachment auxiliary member 403 . As a result, the mounting member 427 clamps and fixes the laminated sound deadening material 408 between the mounting auxiliary member 403 and the presser member 428, and hence between the ejection head main body 401 and the presser member 428.

Each axis of the attachment member 427 is parallel to the axis L403 of the end 14a of the conduit 14. The axes of the end 14a of the conduit 14, the injection head 400, and the muffling means 402 are on a straight line. With the muffling means 402 attached to the ejection head 400, the workability of connecting the base 437 of the ejection head main body 401 to the end 14a of the conduit 14 using the first screw 412 is good.

The axis L403 of the end 14a of the conduit 14 is aligned with the axes of the ejection head 400 including the ejection head main body 401, the sound deadening material 408, and the pressing member 428. Therefore, the workability of the connection between the end 14a of the conduit 14 and the base 437 of the ejection head main body 401 using the first screw 412 and the connection between the base 437 of the ejection head main body 401 and the attachment auxiliary member 403 using the second screw 407 is improved. , is good. This good connection workability means that, in many cases, the injection head 400 and the silencing means 402 are installed in a section of the building to be extinguished, at a location that does not pose an obstacle to the movement of people, such as on a ceiling that is higher than the person's height. This is important considering that it will be connected to places such as

When extinguishing a fire, the high-pressure extinguishing gas injected through the nozzle hole 404 gradually passes through the fine voids of the sound-absorbing material 408, depressurizes and expands smoothly, reducing the generation of sound. It is suppressed and sprayed into the space within the fire extinguishing section of the building. The extinguishing gas from the circumferential surface 424 of the sound deadening material 408 is injected horizontally and radially near the ceiling, and can be uniformly and quickly diffused throughout the space within the section to be extinguished. Therefore, it is possible to quickly extinguish the fire in the area to be extinguished.

With this sound deadening material 408, it is possible to achieve a large sound reduction effect while downsizing the configuration.

In the above-described embodiment, the silencing means 402, which has a more complicated configuration than the ejection head 400, can be attached to and removed from various types of ejection heads 400 with different diameters of the nozzle holes 404 by means of the mounting member 427. can be commonly used for various types of ejection heads 400. This common use facilitates mass production of the sound deadening material 408 and improves productivity.

In addition, depending on whether or not there is a need for silencing in the fire extinguishing area, individual selection and use is easily possible. Simplification can be achieved. Furthermore, the silencing means 402 removed from a fire extinguishing area where the need for silencing is no longer required can be attached to another fire extinguishing area to be reused, resulting in good economic efficiency and energy savings. will be promoted.

In other embodiments of the invention, the jetting head 400 and the muffling means 402 may be constructed integrally, ie non-removably. In this embodiment, the base 437 of the ejection head main body 401 is detachably provided at the end 14a of the conduit 14 by a first screw 412, and various ejection heads 400 having different diameters of the nozzle holes 404 can be individually connected. It may be used selectively.

Further, the silencing means 402 and the injection head 400 are connected in advance by the second screw 407 and the attachment member 427 to form an assembly, and then the base 437 of the injection head main body 401 in this assembly is connected to the end of the conduit 14. 14a by the first screw 412 is also easy to work with.

Furthermore, in order to make the existing fire extinguishing target section, in which the base 437 of the jet head main body 401 is connected to the end 14a of the conduit 14 by the first screw 412, into a fire extinguishing target section that should be silenced, the jet head main body 401 is When the silencing means 402 is connected by the mounting member 427, the workability of the connection is also good.

A gap 415 exists between the end surface of the sound deadening material 408 on the side facing the nozzle hole 404 and the end surface of the nozzle member 409 on the side facing the sound deadening material 408. When fire extinguishing gas is injected from the nozzle hole 404, fine foreign matter is stored and stored in the gap 415, so that it is possible to prevent clogging of the sound deadening material 408 due to foreign matter, and also to reduce noise caused by clogging of foreign matter. It is possible to prevent the occurrence of water and a decrease in the flow rate at the time of release.

Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit is a plated tube, rust, and sealing materials used in pipe fittings. Such as debris. In addition, by reducing the pressure inside the injection head 400 and releasing the extinguishing gas radially outward, the injection reaction force that acts from the injection head 400 to the conduit 14 in the rearward direction (to the left in FIG. 24) when extinguishing gas is injected can be reduced. It can be reduced to about 1/9 of the conventional technology shown in FIG.

In another embodiment of the present invention, the end face of the sound deadening material 408 in the above-described embodiment, which is disposed on the nozzle hole 404 side, and the sound deadening of the jet head 700 in which the jet head main body 401 and the attachment auxiliary member 403 are integrated. The inventor of the present invention has confirmed that the silencing effect does not decrease even if the end face disposed opposite the material 408 is spaced apart. The experiment and its results will be described below with reference to FIGS. 26 and 27.

FIG. 26 is a cross-sectional view showing the injection head 700 and the muffling means 701, 701a tested by the present inventor, and FIG. 27 is a cross-sectional view showing the results obtained when the present inventor discharges extinguishing gas using the configuration shown in FIG. FIG. 3 is a diagram showing a change in sound pressure level over time. In FIG. 26(1), extinguishing gas, which is N ₂ gas, from conduit 714 is injected from nozzle hole 704 of injection head 700 .

Three sheets of sound deadening material 706 are stacked and arranged on the downstream side (right side in FIG. 26) of the nozzle member 703 attached to the injection head 700 in the extinguishing gas discharge direction. The extinguishing gas passes through the nozzle hole 704 of the nozzle member 703, flows into the sound deadening material 706, and is released from the other end surface 709 of the sound deadening material 706 in the axial direction through the discharge hole 752 of the holding member 728 into the space within the section to be extinguished. be done. The sound deadening material 706 closely contacts the flat end surface of the outlet end of the nozzle hole 704 of the nozzle member 703 .

The supply pressure of the extinguishing gas supplied from the conduit 714 to the injection head 700 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is approximately 55 m ³ /min, and the flow rate of the extinguishing gas discharged from the nozzle hole 704 is, for example, 3 MPa to 7 MPa. is approximately 60 to 100 m/sec. The porosity of the sound deadening material 706 used in this experiment was approximately 97%, the diameter was approximately 130 mm, and the thickness was 10 mm/sheet.

In FIG. 26(2), the sound deadening material 706 of the sound deadening means 701a is arranged with a gap 753 of about 1 mm in the axial direction from the flat end surface of the outlet end of the nozzle hole 704 of the nozzle member 703, and the other configuration is as follows. This is similar to FIG. 26(1).

FIG. 27 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention discharged extinguishing gas using the configuration shown in FIG. 26. Line 754 is the result of an experiment in which the sound deadening material 706 is in close contact with the flat end surface of the outlet end of the nozzle hole 704 as shown in FIG. 26(1), and line 755 is the result of an experiment in FIG. These are the experimental results for a configuration in which the sound deadening material 705 is arranged with a gap 753 from the flat end surface of the outlet end of the nozzle hole 704.

From these experimental results, it was found that according to the configuration in which the sound deadening material 706 was placed in close contact with the flat end surface of the outlet end of the nozzle hole 704 (FIG. 26 (1)), the configuration in which it was placed with a gap 753 (FIG. 26 It was confirmed that there was almost no difference in the silencing effect compared to (2)). Therefore, it was confirmed that even if a gap 753 is provided between the end surface of the sound deadening material 706 facing the nozzle hole 704 and the end surface facing the sound deadening material 706 of the ejection head 700, the sound deadening effect does not deteriorate.

By providing such a gap 753 between the end face of the sound deadening material 706 facing the nozzle hole 704 and the end face facing the sound deadening material 706 of the ejection head 700, fine foreign matter can be prevented without reducing the sound deadening effect. When the fire extinguishing gas stored in the gap 753 is injected from the nozzle hole 704, it is possible to prevent clogging of the sound deadening material 706 due to foreign objects, and also to prevent noise generation due to clogging of the foreign objects. Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit 14 is a plated tube, rust, and sealing material used in pipe fittings. fragments, etc.

Therefore, as in the embodiments shown in FIGS. 22 to 26, a gap 415 is provided between the end surface of the sound deadening material 408 facing the nozzle hole 404 and the end surface of the jet head main body 401 facing the sound deadening material 408. At this time, by setting the distance ΔL2 in the direction of the axis L403 to a range that does not reduce the sound deadening effect, for example, 0.1 mm to 1.5 mm, clogging of the sound deadening material 408 due to foreign objects can be prevented without substantially reducing the sound deadening effect. It can be prevented.

FIG. 28 is a sectional view showing the ejection head 500 and the muffling means 502, 502a tested by the inventor of the present invention. In FIG. 28(1), extinguishing gas, which is N ₂ gas, from conduit 514 is injected from nozzle hole 504 of injection head 500 .

Eleven sheets of sound deadening material 508 are stacked and housed in a right cylindrical housing 551 of the sound deadening means 502 attached to the ejection head 500. The extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 552 of the housing 551 into the space within the section to be extinguished. The sound deadening material 508 closely contacts the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500 .

The supply pressure of the extinguishing gas supplied from the conduit 514 to the injection head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is approximately 55 m ³ /min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 is, for example, 3 MPa to 7 MPa. is approximately 60 to 100 m/sec. The porosity of the sound deadening material 508 used in this experiment was approximately 97%, the diameter was approximately 130 mm, and the thickness was 10 mm/sheet.

In FIG. 28(2), the silencing material 508 of the silencing means 502a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the ejection head 500, and the other configuration is as shown in FIG. 28(2). This is the same as 1).

FIG. 29 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention discharged extinguishing gas using the configuration shown in FIG. 28. Line 554 is the result of an experiment in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 28(1), and line 555 is the result of an experiment as shown in FIG. These are experimental results based on a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, it was found that according to the configuration in which the sound deadening material 508 was placed in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 28 (1)), the configuration in which it was arranged with a gap 553 (FIG. 28 It was confirmed that a large noise reduction effect of approximately 16 dB was obtained compared to (2)). Therefore, it has been confirmed that according to the embodiment in which the end face of the sound deadening material 508 facing the nozzle hole 504 and the end face facing the sound deadening material 508 of the ejection head 500 are brought into close contact with each other, the sound deadening effect is improved. It was done.

FIG. 30 is a sectional view showing a gas fire extinguishing device according to another embodiment of the present invention. In the muffling means 600 of this gas fire extinguishing system, the above-mentioned guide member 421 is omitted. The function of the guide member 421 will be explained with reference to FIG. 30.

The extinguishing gas from each of the plurality of nozzle holes 609 formed in a uniform distribution over the entire surface of the flat nozzle portion 608 of the jet head main body 601 is injected along the mutually parallel axis of each nozzle hole 609, The sound absorbing material 613 and the sound absorbing material 610 arranged downstream of the nozzle hole 609 gradually pass through the fine gaps of the sound deadening material 613 and the sound deadening material 610 and are decompressed and expanded. The respective axes of the jet head main body 601 and the sound deadening material 613 are on a straight line. The minute voids in the sound deadening material 613 give a pressure loss to the extinguishing gas passing through them.

Assuming that the path followed by the extinguishing gas injected into the sound deadening material 613 from each nozzle hole 609 of the jetting head main body 601 is a straight line for the sake of simplicity, the sound deadening material 613 has an almost right circular column shape as a whole. The path length to the most downstream end face of is indicated by reference numeral L601 in FIG.

The path length from the side of the jet head main body 601 to the circumferential surface 614 of the sound deadening material 613 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of extinguishing gas injected from the nozzle hole 609, if the outer diameter of the injection head main body 601 is configured to be relatively larger than the length of the sound deadening material 613 in the axial direction, L601>L602.

The pressure loss acting on the fire extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of pressure loss in the sound deadening material 613 is as shown by the isobar line 603 connecting positions where the same pressure loss occurs. The pressure loss is greatest in the region on the axis of the sound deadening material 613, and decreases as the peripheral region moves away from the axis.

Since the extinguishing gas injected from the nozzle hole 609 tends to flow to an area where the pressure loss is small, the extinguishing gas in the sound deadening material 613 is directed in the axial direction of the injection head main body 601 as indicated by the imaginary line reference mark 604. , and to the side, as indicated by reference numeral 605 , and also to the rear, as indicated by reference numeral 606 . The lengths of reference numerals 604, 605, 606 are shown corresponding to the flow rate of extinguishing gas, with a relatively large flow of extinguishing gas flowing in said side and rear directions.

In order to quickly fill the fire extinguishing target compartment with fire extinguishing gas, from among the plurality of sound deadening materials 610 installed near the wall surface (on the left side in FIG. The extinguishing gas is injected in the direction indicated by reference numeral 604 and laterally in the direction indicated by reference numeral 605 at as large a flow rate as possible, and the flow rate of the extinguishing gas traveling toward the rear as indicated by reference numeral 606 is suppressed. There must be.

In each of the embodiments described above in connection with FIGS. 22 to 29 of the present invention, the guide member 421 is configured to control the extinguishing gas that is injected from the sound deadening material 613 and travels in the rear direction 606 in FIG. The ejection head is prevented from moving in the axial direction 604 and sideways 605 of the ejection head main body 601 of the ejection head. As a result, even in large-scale extinguishing areas where the extinguishing gas reach distance is 15 meters or more, the extinguishing gas can be sufficiently diffused and the space within the extinguishing area can be uniformly maintained at a predetermined extinguishing agent concentration in a short time. You will be able to reach it and extinguish the fire.

The gas fire extinguishing system of the present invention discharges extinguishing gas as an extinguishing agent into the space within the fire extinguishing area of a building when a fire occurs, thereby sufficiently dispersing the extinguishing gas and extinguishing the fire even in a large fire extinguishing area. It can be widely implemented to

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space within a fire extinguishing target section in a building, the fire extinguishing gas injection device comprising an injection head 400 and a discharge of extinguishing gas from the injection head 400. The sound damping means 402 includes a sound deadening member 408 as a first sound deadening member provided on the side of the jetting head 400, and a sound deadening member 408 provided on the downstream side of the first sound deadening member. Each of the first and second sound damping members is formed into a flat plate shape and is made of a porous material through which gas can flow. The first and second sound deadening members are stacked to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surfaces of the first and second sound deadening members are exposed to the atmosphere. The device further includes a plate-shaped holding member 428 for fixing the second sound deadening member.

(Appendix 1 invention)
Supplementary Note 1 The invention is
(a) An injection head 100 having a nozzle hole 104 that injects high-pressure extinguishing gas toward a space within a section to be extinguished in a building;
(b) a conduit 14 having an end 14a to which the injection head 100 is connected and guiding high pressure extinguishing gas to the injection head 100;
(c) a fire extinguishing gas supply source 15 that supplies high pressure fire extinguishing gas to the conduit 14;
(d) A gas fire extinguishing device including a muffling means 102 provided in the injection head 100 and attenuating the sound caused by the release of fire extinguishing gas from the nozzle hole 104,
(e) The ejection head 100 is
(e1) an injection head main body 101 connected to the end 14a of the conduit 14;
(e2) has an attachment auxiliary member 103 that is removably attached to the ejection head main body 101;
(f) The silencing means 102 is
(f1) a rectifying member 109 having a rectifying hole 112 and detachably provided on the attachment auxiliary member 103 so as to cover the nozzle hole 104 of the jet head main body 101;
(f2) A first sound deadening material 113 formed in a flat plate shape and made of a porous material through which gas can flow, and a plurality of sheets are stacked and arranged between the rectifying member 109 and the ejection head main body. ,
(f3) The second sound deadening material 108 is formed into a flat plate shape and is made of a porous material through which gas can flow, and a plurality of sheets are stacked and arranged in the rectifying member 109 in the direction in which the extinguishing gas is released. This is a gas fire extinguishing system characterized by:

Supplementary Note 1 According to the invention, the high-pressure extinguishing gas supplied from the extinguishing gas supply source 15 to the conduit 14 is injected toward the space inside the building via the injection head 100. Such an injection head 100 is provided with a noise reduction means 102, which can prevent generation of large injection noise caused by the jet flow of extinguishing gas injected at high speed from the nozzle hole 104 of the injection head 100.

The extinguishing gas flows from the conduit 14 through the nozzle hole 104 of the injection head 100, the first sound deadening material 113, and the rectifying member 109, and flows into the second sound deadening material 108, and passes through the minute voids that the second sound deadening material 108 has. It expands under reduced pressure and is injected into the space within the fire extinguishing section of the building.

Regarding the large sound reduction effect due to the compact configuration, when extinguishing a fire, the high-pressure extinguishing gas injected through the nozzle hole 104 is decompressed and expanded by passing through the fine voids of the first sound deadening material 113, and the rectifying member After the flow is rectified through the rectifying hole 112 of the extinguishing gas 109, it flows into the second sound deadening material 108 and is further depressurized and expanded, thereby gradually and smoothly decompressing and expanding without reducing the flow rate of the extinguishing gas, effectively generating sound. is suppressed. In this way, it is possible to achieve a large sound reduction effect while downsizing the configuration.

Each of the plurality of first and second sound deadening materials 113, 108 is made of a porous material through which gas can flow, is formed into a flat plate shape, and is assembled by laminating them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Furthermore, it is sufficient to manufacture the first and second sound deadening materials 113 and 108 having the same size and shape, which facilitates mass production and improves productivity.

Supplementary Note 1 The invention is characterized in that a gap 115 exists between the end face of the first sound deadening material 113 on the side facing the nozzle hole 104 and the end face of the ejection head 100 on the side facing the first sound deadening material 113. shall be.

Supplementary Note 1 According to the invention, a gap 115 is provided between the end surface of the first sound deadening material 113 facing the nozzle hole 104 and the end surface of the ejection head facing the first sound deadening material 113. is stored and stored in the gap 115, so when the fire extinguishing gas is injected from the nozzle hole 104, the first and second sound deadening materials 113, 108 are prevented from being clogged by foreign matter, and the noise caused by foreign matter is prevented from being clogged. occurrence and flow reduction are prevented. Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit 14 is a plated tube, rust, and sealing material used in pipe fittings. fragments, etc.

Supplementary Note 1 The invention is characterized in that the peripheral surface 124 of the laminated second sound deadening material 108 is open to the atmosphere.

Supplementary note 1 According to the invention, since the peripheral surface 124 of the second sound deadening material 108 is open to the atmosphere, there is a large discharge area for the fire extinguishing gas, which suppresses a decrease in the flow rate of the fire extinguishing gas, and increases the area for gas discharge. It becomes possible to secure the required flow rate and flow velocity without increasing the cross-sectional area of the flow path, and the configuration is further miniaturized.

(Additional Note 1 Effect of the invention)
Supplementary Note 1 According to the invention, since the injection head 100 is provided with the muffling means 102, even if high-pressure extinguishing gas is injected from the injection head 100 when a fire occurs, it is possible to prevent loud injection noise from being generated. . Further, each of the plurality of first and second sound deadening materials 113, 108 is made of a porous material through which gas can flow, is formed into a flat plate shape, and is assembled by laminating them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Furthermore, it is sufficient to manufacture the first and second sound deadening materials 113 and 108 having the same size and shape, which facilitates mass production and improves productivity.

Further, according to the invention in Supplementary Note 1, the gap 115 is provided between the end surface of the first sound deadening material 113 on the side facing the nozzle hole 104 and the end surface of the jetting head 100 on the side facing the second sound deadening material 108. When fine foreign matter is stored and stored in the gap 115 and extinguishing gas is injected from the nozzle hole 104, the first and second sound deadening materials 113, 108 are prevented from being clogged by the foreign matter, and the foreign matter is also prevented from clogging. It is possible to prevent the generation of noise due to the fire extinguishing gas, and also to prevent a decrease in the flow rate due to clogging when injecting the fire extinguishing gas.

Further, according to the invention in Supplementary Note 1, since the peripheral surface 124 of the second sound deadening material 108 is exposed to the atmosphere, a decrease in the flow rate of the extinguishing gas is suppressed, and the cross-sectional area of the flow path for gas release is not increased. The necessary flow rate and velocity are ensured, and the injection of extinguishing gas is not obstructed by obstacles, and therefore, the compact configuration can prevent loud injection noise from being generated.

(Additional note 2 invention)
Supplementary Note 2 The invention is
(a) An injection head 200 having a nozzle hole 204 that injects high-pressure extinguishing gas toward a space within a section to be extinguished in a building;
(b) a conduit 14 having an end 14a to which the injection head 200 is connected and guiding high pressure extinguishing gas to the injection head 200;
(c) a fire extinguishing gas supply source 15 that supplies high pressure fire extinguishing gas to the conduit 14;
(d) A gas fire extinguishing device including a muffling means 202 provided in the injection head 200 and attenuating the sound caused by the release of fire extinguishing gas from the nozzle hole 204,
(e) The ejection head 200 is
(e1) an injection head main body 201 connected to the end 14a of the conduit 14;
(e2) A nozzle member 234,
(e2-1) a cylindrical portion 240 extending along the axis of the end 14a of the conduit 14 and having one axial end connected to the ejection head main body 201;
(e2-2) comprising a nozzle member 234 that is continuous with the other axial end of the cylindrical portion 240, has a nozzle hole 204 formed therein, and has an end wall 241 that closes the other axial end of the cylindrical portion 240;
(f) The silencing means 202 is
(f1) The sound deadening material 208 is formed into a flat plate shape and is made of a porous material through which gas can flow, and a plurality of sheets are stacked, and an end surface 220 on one side in the axial direction of the stacked sound deadening material 208 a sound deadening material 208 disposed facing the jet head main body 201;
(f2) a pressing member 228 that presses the end surface 225 of the stacked sound deadening material 208 on the other side in the axial direction;
(f3) A gas fire extinguishing device characterized by having a mounting member 227 that clamps and fixes the sound deadening material 208 between the injection head main body 201 and the pressing member 228.

Supplementary Note 2 According to the invention, the high-pressure extinguishing gas supplied from the extinguishing gas supply source 15 to the conduit 14 is injected toward the space inside the building via the injection head 200. Such an injection head 200 is provided with a noise reduction means 202, which can prevent generation of large injection noise caused by the jet flow of extinguishing gas injected at high speed from the nozzle hole 204 of the injection head 200.

The fire extinguishing gas flows from the conduit 14 into the sound deadening material 208 through the nozzle hole 204 of the injection head 200, passes through minute voids in the sound deadening material 208, expands under reduced pressure, and is injected into the space within the fire extinguishing target section of the building. be done.

Regarding the large sound reduction effect achieved by the compact configuration, when extinguishing a fire, the high-pressure extinguishing gas injected through the nozzle hole 204 is decompressed and expanded by passing through the minute voids of the sound deadening material 208, and the extinguishing gas is reduced in pressure and expanded. Sound generation is effectively suppressed by gradually and smoothly depressurizing and expanding without reducing the flow rate. In this way, it is possible to achieve a large sound reduction effect while downsizing the configuration.

The plurality of sound deadening materials 208 are made of a porous material through which gas can flow, are formed into flat plate shapes, and are assembled by stacking them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Furthermore, it is sufficient to manufacture the sound deadening material 208 having the same size and shape, which facilitates mass production and improves productivity.

Supplementary note 2 The invention is characterized in that a gap 215 exists between the end surface 220 of the sound deadening material 208 on the side facing the nozzle hole 204 and the end surface 232 of the jet head main body 201 on the side facing the sound deadening material 208. do.

Supplementary Note 2 According to the invention, the gap 215 is provided between the end surface of the sound deadening material 208 facing the nozzle hole 204 and the end surface of the ejection head facing the sound deadening material 208, so that foreign matter does not enter the gap 215. When the stored extinguishing gas is injected from the nozzle hole 204, clogging of the sound deadening material 208 due to foreign matter is prevented, and generation of noise and reduction in flow rate due to clogging of the foreign matter are also prevented. Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit 14 is a plated tube, rust, and sealing material used in pipe fittings. fragments, etc.

Supplementary Note 2 The invention is characterized in that the peripheral surface 224 of the layered sound deadening material 208 is open to the atmosphere.

Supplementary note 2 According to the invention, since the circumferential surface 224 of the sound deadening material 208 is open to the atmosphere, there is a large discharge area for the extinguishing gas, which suppresses a decrease in the flow rate of the extinguishing gas, and creates a flow path for gas discharge. It becomes possible to secure the required flow rate and flow velocity without increasing the cross-sectional area, and the configuration is further miniaturized.

(Additional Note 2 Effects of the invention)
Supplementary note 2 According to the invention, since the injection head 200 is provided with the muffling means 202, even if high-pressure extinguishing gas is injected from the injection head 200 when a fire occurs, it is possible to prevent loud injection noise from being generated. . Further, the plurality of sound deadening materials 208 are made of a porous material through which gas can flow, are formed into flat plate shapes, and are assembled by stacking them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Further, it is sufficient to manufacture the sound deadening material 208 having the same size and shape, which facilitates mass production and improves productivity.

Further, according to the invention in Supplementary Note 2, since the gap 215 is provided between the end face of the sound deadening material 208 on the side facing the nozzle hole 204 and the end face of the jetting head on the side facing the sound deadening material 208, fine foreign matter can be prevented. When the extinguishing gas stored in the gap 215 is injected from the nozzle hole 204, clogging of the sound deadening material 208 due to foreign matter is prevented, noise generation due to clogging of the foreign matter is prevented, and the extinguishing gas is injected. It is possible to prevent a decrease in flow rate due to clogging at times.

Further, according to the invention in Supplementary Note 2, the peripheral surface 224 of the sound deadening material 208 is exposed to the atmosphere, so that a decrease in the flow rate of the extinguishing gas is suppressed, and the required flow rate is suppressed without increasing the cross-sectional area of the flow path for gas release. The flow rate and flow velocity are ensured, and the injection of extinguishing gas is not obstructed by obstacles, and therefore, the compact configuration can prevent generation of loud injection noise.

(Appendix 3 invention)
Supplementary Note 3 The invention is
(a) An injection head 300 having a nozzle hole 304 that injects high-pressure extinguishing gas toward a space within a section to be extinguished in a building;
(b) a conduit 314 having an end 303 to which the injection head 300 is connected and guiding high-pressure extinguishing gas to the injection head 300;
(c) a fire extinguishing gas supply source 315 that supplies high pressure fire extinguishing gas to the conduit 314;
(d) A gas fire extinguishing device including a muffling means 302 provided in the injection head 300 and attenuating the sound caused by the release of fire extinguishing gas from the nozzle hole 304,
(e) The ejection head 300 is
(e1) An ejection head main body 301,
a base 337 connected to the end 303 of conduit 314;
an ejection head main body 301 having an outward flange 338 connected to a base 337;
(e2) A nozzle member 339,
(e2-1) A cylindrical portion 340 extending along the axis L303 of the end portion 303 of the conduit 314, connected to a circumferential wall 342 in which a plurality of nozzle holes 304 are formed, and one end of the circumferential wall 342 in the axial direction; a cylindrical portion 340 having a base end portion 306 connected to a base portion 337 of the head body 301;
(e2-2) having a nozzle member 339 having an end wall 341 that closes the other end in the axial direction of the peripheral wall 342;
(f) The silencing means 302 is
(f1) Sound deadening material 308, each sound deadening material 308 is formed into a flat plate shape, a plurality of sheets are laminated, and is made of a porous material through which gas can flow, and has an insertion hole 310 through which the cylindrical portion 340 is inserted. An end surface 320 on one axial side (upper side in FIG. 19) of the laminated sound deadening material 308 is disposed on the outward flange 338 side of the ejection head main body 301, and the peripheral surface 324 of the laminated sound deadening material 308 is a sound deadening material 308 that is exposed to the atmosphere;
(f2) a pressing member 328 that presses the end surface 325 on the other side (lower side in FIG. 19) of the laminated sound deadening material 308;
(f3) A gas fire extinguishing device characterized by having an attachment member 327 that clamps and fixes the sound deadening material 308 between the outward flange 338 and the pressing member 328.

According to the third aspect of the invention, the high-pressure extinguishing gas supplied from the extinguishing gas supply source 315 to the conduit 314 is injected into the space inside the building via the injection head 300. Such an injection head 300 is provided with a noise reduction means 302, which can prevent generation of large injection noise caused by the jet stream of extinguishing gas injected at high speed from the nozzle hole 304 of the injection head 300.

The extinguishing gas passes from the conduit 314, through the nozzle hole 304 formed in the cylindrical part 340 of the injection head 300, passes through the minute voids of the sound deadening material 308, expands under reduced pressure, and fills the space in the fire extinguishing section of the building. is injected into.

Regarding the large sound reduction effect due to the compact configuration, when extinguishing a fire, the high-pressure extinguishing gas injected through the nozzle hole 304 passes through the fine voids of the sound deadening material 308, thereby reducing the fine voids in the sound deadening material 308. Then, it gradually expands under reduced pressure, that is, smoothly, and the generation of sound is reduced and suppressed. In this way, it is possible to achieve a large sound reduction effect while downsizing the configuration. Since the peripheral surface 324 of the sound deadening material 308 is exposed to the atmosphere, the structure can be further miniaturized.

Each of the plurality of sound deadening materials 308 is made of a porous material through which gas can flow, is formed into a flat plate shape, and is assembled by laminating them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Further, it is sufficient to manufacture the sound deadening material 308 having the same size and shape, which facilitates mass production and improves productivity.

Supplementary Note 3 The invention is characterized in that the mounting member 327 is constituted by a bolt, passes through the presser member 328 and the sound deadening material 308, and is screwed into an internal thread formed by opening a hole in the outward flange 338. do.

Supplementary note 3 According to the invention, the bolt that is the mounting member 327 passes through the presser member 328 and the sound deadening material 308 and is screwed onto the female thread of the outward flange 338, so the number of stacked sound deadening materials 308 can be reduced. In order to adjust the change in , it is only necessary to change the required length of the bolt, and furthermore, it is certain that almost the entire circumferential surface 324 of the sound deadening material 308 is exposed to the atmosphere, and the structure is simplified. be able to.

Supplementary Note 3 The invention is characterized in that a gap exists between the inner circumferential surface of the insertion hole 310 of the sound deadening material 308 and the outer circumferential surface of the cylindrical portion 340 of the nozzle member 339.

Supplementary note 3 According to the invention, fine foreign matter is stored and stored in the gap, so when extinguishing gas is injected from the nozzle hole 304, the nozzle hole 304 is prevented from being clogged by the foreign matter, and the foreign matter is also prevented from clogging the nozzle hole 304. Noise generation and flow reduction due to clogging can be prevented. Foreign matter is present in the conduit 314, such as scale and slag due to welding in the conduit 314, peeled pieces of the plating layer in the plated tube when the conduit 314 is a plated tube, rust, and sealing material used in pipe fittings. fragments, etc.

Supplementary Note 3 The invention is characterized in that the inner circumferential surface of the insertion hole 310 of the sound deadening material 308 and the outer circumferential surface of the cylindrical portion 340 of the nozzle member 339 are in close contact with each other.

Supplementary Note 3 According to the invention, the inner circumferential surface of the insertion hole 310 of the sound deadening material 308 and the exit end surface of the nozzle hole 304 formed in the cylindrical portion 340 of the nozzle member 339 are in close contact, thereby improving the sound deadening effect. This was confirmed by the inventor of the present invention, as will be described later with reference to FIGS. 20 and 21.

(Appendix 3 Effects of the invention)
Supplementary note 3 According to the invention, since the injection head 300 is provided with the muffling means 302, even if high-pressure extinguishing gas is injected from the nozzle member 339 of the injection head 300 in the event of a fire, a loud injection sound will be generated and the flow rate will be reduced. can be prevented.

Further, according to the invention in Supplementary Note 3, since the peripheral surface 324 of the sound deadening material 308 is open to the atmosphere, the injection of extinguishing gas is not obstructed by obstacles etc. Therefore, the compact configuration allows a large injection It is possible to prevent the generation of sound.

Each of the plurality of sound deadening materials 308 is made of a porous material through which gas can flow, is formed into a flat plate shape, and is assembled by laminating them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Further, it is sufficient to manufacture the sound deadening material 308 having the same size and shape, which facilitates mass production and improves productivity.

(Appendix 4 invention)
Supplementary Note 4 The invention is
(a) An injection head 400 having a nozzle hole 404 that injects high-pressure extinguishing gas toward a space within a section to be extinguished in a building;
(b) a conduit 14 having an end 14a to which the injection head 400 is connected and guiding high pressure extinguishing gas to the injection head 400;
(c) a fire extinguishing gas supply source 15 that supplies high pressure fire extinguishing gas to the conduit 14;
(d) A gas fire extinguishing device including a muffling means 402 provided in the injection head 400 and attenuating the sound caused by the release of fire extinguishing gas from the nozzle hole 404,
(e) The ejection head 400 is
(e1) an injection head main body 401 connected to the end 14a of the conduit 14;
(e2) A nozzle member 409,
(e2-1) a cylindrical portion 440 that extends along the axis of the end portion 14a of the conduit 14 and has one axial end connected to the ejection head main body 401;
(e2-2) A nozzle member 409 that is continuous with the other end in the axial direction of the cylindrical portion 440, has a nozzle hole 404 formed therein, and has an end wall 441 that closes the other end in the axial direction of the cylindrical portion 440; f) The muffling means 402 includes:
(f1) The sound deadening material 408 is formed into a flat plate shape and is made of a porous material through which gas can flow, and a plurality of sheets are stacked, and an end surface 420 on one side in the axial direction of the stacked sound deadening material 408 a sound deadening material 408 disposed facing the jet head main body 401;
(f2) a pressing member 428 that presses the end surface 425 of the stacked sound deadening material 408 on the other side in the axial direction;
(f3) a mounting member 427 that clamps and fixes the sound deadening material 408 between the ejection head main body 401 and the pressing member 428;
(f4) A guide member having an annular attachment portion 422 disposed facing the jet head main body 401 and a short cylindrical guide portion 423 that is continuous with the attachment portion 422 and covers the circumferential surface 424 of the laminated sound deadening material. 421 is a gas fire extinguishing system characterized by comprising:

According to the fourth aspect of the invention, the high-pressure extinguishing gas supplied from the extinguishing gas supply source 15 to the conduit 14 is injected into the space inside the building via the injection head 400. Such an injection head 400 is provided with a noise reduction means 402, and can prevent generation of large injection noise caused by a jet stream of extinguishing gas injected at high speed from a nozzle hole 404 of the injection head 400.

The guide member 421 includes a mounting portion 422 and a short cylindrical guide portion 423 that is connected to the mounting portion 422 and guides the extinguishing gas. The other end surface 425 of the sound deadening material 408 is open to the atmosphere except for the portion that contacts the pressing member 428. A peripheral surface 424 of the sound deadening material 408 is surrounded by a guide portion 423 of the guide member 421. Therefore, the extinguishing gas flows from the conduit 14 through the injection head 400 and the nozzle hole 404 of the nozzle member 409, flows into the sound deadening material 408, passes through the fine voids of the sound deadening material 408, expands under reduced pressure, and expands to the sound deadening material 408. The extinguishing gas is injected into the space within the area to be extinguished in the building while its release from the peripheral surface 424 is suppressed by the guide portion 423, allowing the extinguishing gas to reach a long distance without making a loud noise.

Regarding the large sound reduction effect achieved by the compact configuration, when extinguishing a fire, the high-pressure extinguishing gas injected through the nozzle hole 404 is decompressed and expanded by passing through the minute voids of the sound deadening material 408, and thus the extinguishing gas is Sound generation is effectively suppressed by gradually and smoothly depressurizing and expanding without reducing the flow rate. Since it is not necessary to provide a large sound attenuation space for attenuating sound in this way, it is possible to achieve a large sound reduction effect while downsizing the configuration.

The plurality of sound deadening materials 408 are made of a porous material through which gas can flow, are formed into flat plate shapes, and are assembled by stacking them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Further, it is sufficient to manufacture the sound deadening material 408 having the same size and shape, which facilitates mass production and improves productivity.

Supplementary Note 4 The invention is characterized in that a gap 415 exists between the end surface of the sound deadening material 408 on the side facing the nozzle hole 404 and the end surface of the nozzle member 409 on the side facing the sound deadening material 408.

Supplementary Note 4 According to the invention, a gap 415 is provided between the end surface of the sound deadening material 408 on the side facing the nozzle hole 404 and the end surface of the nozzle member 409 on the side facing the sound deadening material 408. When the fire extinguishing gas is injected from the nozzle hole 404, clogging of the sound deadening material 408 due to foreign matter is prevented, and generation of noise and reduction in flow rate due to clogging of the foreign matter are also prevented. Foreign matter is present in the conduit 14, such as scale and slag due to welding in the conduit 14, peeled pieces of the plating layer in the plated tube when the conduit 14 is a plated tube, rust, and sealing material used in pipe fittings. fragments, etc.

Supplementary Note 4 The present invention is characterized in that the guide member 421 further includes an annular expanded portion 443 that is continuous with the other end of the guide portion 423 in the axial direction and expands into a truncated cone shape.

Supplementary note 4 According to the invention, since the guide member 421 has the widening portion 443, the extinguishing gas released from the other axial end face of the sound deadening material 408 is directed radially outward with respect to the axis of the injection head immediately after the extinguishing gas is released. It is possible to prevent the fire extinguishing gas from spreading, to make the fire extinguishing gas reach a long distance, and to release the required amount of the fire extinguishing gas within the area to be extinguished.

(Appendix 4 Effects of the invention)
Supplementary note 4 According to the invention, since the injection head 400 is provided with the muffling means 402, even if high-pressure extinguishing gas is injected from the injection head 400 when a fire occurs, it is possible to prevent loud injection noise from being generated. . Further, the plurality of sound deadening materials 408 are made of a porous material through which gas can flow, are formed into flat plate shapes, and are assembled by stacking them. Therefore, by selecting the number of laminated sheets according to the flow rate and pressure of the extinguishing gas injected into the space in the area to be extinguished and the degree of silencing required, the desired characteristics of each type of injection and silencing can be accurately achieved. It is easy to adjust and obtain. Further, it is sufficient to manufacture the sound deadening material 408 having the same size and shape, which facilitates mass production and improves productivity.

Further, according to the invention in appendix 4, since the gap 415 is provided between the end surface of the sound deadening material 408 on the side facing the nozzle hole 404 and the end surface of the jetting head 400 on the side facing the sound deadening material 408, fine foreign particles can be removed. is stored and stored in the gap 415, and when the extinguishing gas is injected from the nozzle hole 404, it prevents clogging of the sound deadening material 408 due to foreign matter, prevents noise generation due to clogging of foreign matter, and extinguishes the fire. It is possible to prevent a decrease in flow rate due to clogging during gas injection.

Supplementary Note 4 According to the invention, since the guide member 421 has the widening portion 443, the extinguishing gas released from the other axial end face of the sound deadening material 408 is directed radially outward with respect to the axis of the injection head immediately after the extinguishing gas is released. It is possible to prevent the fire extinguishing gas from spreading, to make the fire extinguishing gas reach a long distance, and to release the required amount of the fire extinguishing gas within the area to be extinguished.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

14 Conduit, 15 Extinguishing gas supply source, 18 Branch pipe, 19 Branch pipe, 20 Base, 21 Bracket, 22 Fastener, 23 Main pipe, 100 Injection head, 101 Injection head main body, 102 Silencer, 103 Installation auxiliary member, 104 Nozzle hole, 105 base, 106 outward flange, 108 second sound deadening material, 109 rectifying member, 110 screw, 111 fire extinguishing gas injection part, 112 straightening hole, 113 first sound deadening material, 114 annular member, 121 guide member, 122 mounting Part, 123 Guide part, 124 Circumferential surface, 128 Pressing member, 131
Mounting seat, 137 Base, 138 Engaging portion, 200 Ejection head, 201 Ejection head main body, 202 Silencing means, 204 Nozzle hole, 205 Base, 206 Outward flange, 208 Sound deadening material, 221 Guide member, 222 Mounting portion, 223 Guide portion , 224 peripheral surface, 400 jetting head, 401 jetting head main body, 402 sound deadening means, 403 auxiliary installation member, 404 nozzle hole, 405 base, 406 outward flange, 407, 410 screw, 408 sound deadening material, 409 nozzle member, 415 gap , 420 end face, 421 guide member, 422 attachment part, 423 guide part, 424 peripheral surface, 425 end face, 427 attachment member, 428 presser member, 431 attachment seat, 432 end face, 443 expanding part.

Claims (1)

An injection head that injects a fire extinguishing agent supplied from a conduit (14) provided in the fire extinguishing target compartment in order to uniformly reach a predetermined extinguishant concentration in a short time in the space in the fire extinguishing target compartment and extinguish the fire. And,
an orifice plate (109, 234, 409, 608, 611, 703) provided with a plurality of orifices facing each other at the end of the conduit;
first and second porous members provided downstream of the orifice plate, each having a block shape and having a through hole extending parallel to the axial direction of the conduit end;
plate-shaped pressing means (428) for pressing the downstream end surface of the porous member;
an outer peripheral member (421) that covers the peripheral surface of the porous member;
a screwing means (427) that penetrates the through hole provided in the porous member and screws into the mating member in order to prevent the plate-shaped pressing means from coming off the porous member;
The first and second porous members are provided on an axial extension line of the orifice and have the same outer diameter,
The ejection head wherein the circumferential surfaces of the first and second porous members are closely surrounded by the cylindrical inner circumferential surface of the outer circumferential member and are therefore not exposed to the atmosphere.

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