JP7697652B2 - Gas-based fire extinguishing equipment roll-out piping structure and method of using gas-based fire extinguishing equipment roll-out piping - Google Patents

Description

The present invention relates to a winding piping structure for a gas-based fire extinguishing system that uses fire extinguishing gases such as halide gases and inert gases (inert gases), and a method for using the winding piping for a gas-based fire extinguishing system.

Conventionally, the unwinding piping section 5 of a gas-based fire extinguishing system (see, for example, Patent Document 1) that uses a fire extinguishing gas such as a halide gas or an inert gas (inert gas) has adopted a structure in which, for example, as shown in FIG. 20 , a plurality of steel pipes and joints such as elbows are combined to adjust the position and the construction requires multiple screwing operations in order to accurately attach the injection head to the hole position in the ceiling board.
However, alignment when installing this unwinding piping requires skilled technique, and cutting out the piping to the correct dimensions takes time, which places a burden on the installer.

In order to solve this problem, it may be possible to apply a flexible joint having flexibility, which is used in the unwinding piping of water fire extinguishing systems (see, for example, Patent Document 2), to the unwinding piping.
In other words, by using flexible joints for the unwinding piping, the screwing work of multiple steel pipes can be completed in a single operation, which is expected to simplify construction and reduce time.

However, experiments conducted by the applicant have revealed that when a flexible joint is used for the outlet piping of a gas-based fire extinguishing system, a peculiar noise is generated when the extinguishing gas passes through the bellows of the flexible joint, and is released from the spray head through the flexible joint together with the extinguishing gas.
It was also found that the noise (vibration) emitted from the ejection head may adversely affect precision equipment such as HDDs present in the area to be extinguished (e.g., a server room).
In addition, it is expected that this noise can be reduced to a certain extent by applying to the injection head a spray head equipped with a sound-deadening function, as previously proposed by the present applicant (see, for example, Patent Documents 3 to 5). However, it has also been found that the noise cannot be completely prevented depending on the structure of the unwinding piping.

Japanese Patent Application Publication No. 9-206397 JP 2018-17311 A JP 2011-125673 A Patent No. 5276728 Patent No. 5276730

In view of the problems associated with the above-mentioned conventional reeling piping of gas-based fire extinguishing equipment, the present invention aims to provide a reeling piping structure for gas-based fire extinguishing equipment and a method for using the reeling piping for gas-based fire extinguishing equipment, which uses a flexible joint that has flexibility, thereby enabling the advantages of simplified installation and time-saving to be enjoyed by the flexible joint, while reducing the noise generated when the extinguishing agent gas passes through the bellows portion of the flexible joint.

To achieve the above object, the unwinding piping structure of the gas-based fire extinguishing equipment of the present invention is characterized in that, in the unwinding piping structure of the gas-based fire extinguishing equipment, a flexible joint having a structure for reducing the specific noise generated when the extinguishing agent gas passes through the bellows is used in the unwinding piping section, and the injection head has a sound-reduction function.

In this case, the diameter of the bellows portion of the flexible joint can be made equal to or larger than the diameter of the gas inlet side mounting portion and/or the gas outlet side mounting portion, so as to reduce the flow rate of the extinguishing agent gas passing through the bellows portion.

The diameter of the bellows portion of the flexible joint can be set to 20A to 50A.

The flexible joint can also be attached so that the angle α between the axial direction of the gas inlet side mounting part and the axial direction of the gas outlet side mounting part is 0° to 90°.
Here, the "angle α" has a tolerance of about ±5° as a construction error.

Furthermore, when the gas inlet side mounting part and the gas outlet side mounting part are mounted so that their axial directions are parallel to each other, the flexible joint can be mounted such that, with respect to the total length L of the flexible joint, the axis of the gas inlet side mounting part is the center and the axial perpendicular displacement is within a range of 0.3 L, and the end face of the gas outlet side mounting part is mounted within a range of 0.7 L to 1.0 L from the end face of the gas inlet side mounting part.
Here, "parallel" has an allowable range of approximately ±5° as a construction error.

Furthermore, when the gas inlet side mounting part and the gas outlet side mounting part are mounted so that their axial directions are perpendicular to each other, the axial perpendicular displacement from the axis of the gas inlet side mounting part or the axis of the gas outlet side mounting part can be within a range of 0.5L relative to the total length L of the flexible joint, and the end face of the gas outlet side mounting part or the gas inlet side mounting part can be mounted within a range of 0.5L to 0.9L from the end face of the gas inlet side mounting part or the gas outlet side mounting part.
Here, the "right angle" has an allowable range of about ±5° as a construction error.

The flexible joint can also have a steel pipe section or a reducer, and the ratio of the length of the bellows section to the overall length L of the flexible joint can be made small.

In addition, a gas-based fire extinguishing system can be configured by including at least one or more of the above-mentioned gas-based fire extinguishing system winding piping structures.

In order to achieve the same objective, the method of using the unwinding piping of a gas-based fire extinguishing system of the present invention is a method of using the unwinding piping of a gas-based fire extinguishing system, characterized in that a flexible joint is used in the unwinding piping section in a manner that reduces the noise that is peculiar to when extinguishing gas passes through the bellows, and a spray head with a sound-absorbing function is used as the spray head.

In this case, the flow rate of the extinguishing gas flowing into the gas inlet side mounting part of the flexible joint is limited to a predetermined amount or less.

In addition, the set maximum flow rate of the extinguishing gas flowing into the gas inlet side mounting portion of the flexible joint can be limited to 70% or less of the set maximum flow rate in the case where no flexible joint is used.

According to the unwinding piping structure of the gas-based fire extinguishing equipment and the method of using the same of the present invention, by using a flexible joint having flexibility, it is possible to enjoy the advantages of the flexible joint in terms of simplified installation and time saving, while reducing the noise generated when the fire extinguishing gas passes through the bellows of the flexible joint, and it is possible to prevent the noise (vibration) emitted from the injection head from adversely affecting precision equipment such as HDDs present in the area to be extinguished (e.g., a server room).

FIG. 1 is an explanatory diagram showing a schematic example of a basic structure of a gas-based fire extinguishing system to which the unwinding piping structure of the gas-based fire extinguishing system and the method of using the unwinding piping of the gas-based fire extinguishing system of the present invention are applied. FIG. 2 is an explanatory diagram showing a schematic diagram of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the gas-based fire extinguishing system. 4 is an explanatory diagram showing an example of an injection head equipped with a sound-absorbing function of the gas-based fire extinguishing system. FIG. FIG. 2 is an explanatory diagram showing an example of a pipe fitting (before assembly) for the unwinding piping that constitutes the unwinding piping of the gas-based fire extinguishing system. FIG. 2 is an explanatory diagram showing an example of a pipe fitting (after assembly) for the unwinding piping that constitutes the unwinding piping of the gas-based fire extinguishing system. 4 is an enlarged view of a main portion showing an example of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the gas-based fire extinguishing system. FIG. 1 is an explanatory diagram showing a schematic diagram of an example of the basic structure of a gas-based fire extinguishing system to which the unwinding piping structure of the gas-based fire extinguishing system of the present invention is applied. FIG. 1 is an explanatory diagram showing a schematic diagram of an example of the basic structure of a gas-based fire extinguishing system to which the unwinding piping structure of the gas-based fire extinguishing system of the present invention is applied. FIG. FIG. 2 is an explanatory diagram showing an example of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of an installation mode of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of an installation mode of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of an installation mode of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of an installation mode of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of an installation mode of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of an installation mode of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 2 is an explanatory diagram showing an example of a pipe fitting for a reel-out piping section that constitutes the reel-out piping section of the reel-out piping structure of the gas-based fire extinguishing system of the present invention. FIG. 1 is an explanatory diagram illustrating a typical example of a winding piping structure of a conventional gas-based fire extinguishing system.

The following describes an embodiment of the gas-based fire extinguishing equipment reeling piping structure and a method of using the gas-based fire extinguishing equipment reeling piping of the present invention with reference to the drawings.

FIG. 1 shows a schematic diagram of the basic structure of a gas-based fire extinguishing system 1 to which the unwinding piping structure of the gas-based fire extinguishing system and the method of using the unwinding piping of the gas-based fire extinguishing system of the present invention are applied.
This gas-based fire extinguishing system 1 has a fire extinguishing piping 3 connected to a storage container 2, an injection head 4 for injecting extinguishing agent gas, and a winding piping section 5 provided between the fire extinguishing piping 3 and the injection head 4.
Here, each component of the gas-based fire extinguishing system 1, except for the unwinding piping section 5, can be made of conventional equipment and members that are widely used.
In addition, various gases that can be used for extinguishing fires can be used as the extinguishing gas. For example, halide gas and inert gas (inert gas) are examples of the extinguishing gas. As the inert gas (inert gas), nitrogen gas, argon gas, etc. can be used. In particular, nitrogen gas is preferably used as the extinguishing gas because it has little adverse effect on the human body.

In the gas-based fire extinguishing system 1, when a fire breaks out within a protected area, the container valve of the storage container 2 is opened manually or automatically, and the extinguishing gas stored in the storage container 2 is discharged from the storage container 2 through the fire extinguishing piping 3 and the injection head 4 into the protected area. This reduces the oxygen concentration within the protected area, and the fire within the protected area is extinguished.

Incidentally, in the construction of the gas-based fire extinguishing system 1, the storage vessel 2, the fire extinguishing piping 3, the unwinding piping section 5, and the jet head 4 may be constructed by different persons (construction contractors) on different dates and times.
According to this embodiment, for example, as shown in FIG. 2 , the bellows pipe 51 of the pipe fitting 50 for the unwinding piping section that constitutes the unwinding piping section 5 has flexibility and can be bent (in other words, deformed). Therefore, even an unskilled worker can easily install the unwinding piping section 5 depending on the conditions of the site where the unwinding piping section 5 is to be installed (the arrangement of building materials and other objects, the size of the installation location such as above the ceiling or behind a wall, etc.).
This makes it possible to prevent the occurrence of a situation in which construction of the jet head 4 is delayed due to reasons such as the inability to secure the schedule of a skilled worker to construct the unwinding piping section 5 after the storage container 2 and the fire extinguishing piping 3 have been constructed. In other words, even if it is difficult to secure the schedule of a skilled worker after the storage container 2 and the fire extinguishing piping 3 have been constructed, the unwinding piping section 5 can be constructed by an unskilled worker, and the phase can move on to the construction of the jet head 4.

The injection head 4 is a device for injecting (ie, discharging) the extinguishing gas.
The injection head 4 is connected to the fire extinguishing pipe 3 via the unwinding pipe section 5. The injection head 4 is, for example, of an open type and is always open. The injection head 4 can be installed in various locations such as a ceiling or a wall where the extinguishing agent gas can be discharged into the protected area. The injection head 4 may be an injection head installed on the ceiling surface or an injection head for lateral blowing installed on a wall.
In this embodiment, the injection head 4 may be an injection head with a sound absorbing function, preferably an injection head with a sound absorbing member made of a porous material, as disclosed in Patent Documents 3 to 5. One example of this injection head 4 is an injection head shown in Fig. 3, which is equipped with a plurality of orifices 42 and is equipped with a cylindrical porous sound absorbing member 41 at the outlet thereof, the sound absorbing member 41 being configured by arranging a metallic porous material 41a having a three-dimensional mesh structure with a large pore size in the center and a metallic porous material 41b having a smaller pore size in the outer periphery in layers, for eliminating turbulence in the airflow.

The unwinding piping section 5 is provided between the fire extinguishing piping 3 and the injection head 4 .
The pipe fitting 50 for the unwinding pipe section is a member that the unwinding pipe section 5 has. The unwinding pipe section 5 may be composed of only one pipe fitting 50 for the unwinding pipe section, may have a member other than the pipe fitting 50 for the unwinding pipe section, or may have a plurality of pipe fittings 50 for the unwinding pipe section. An example of a member other than the pipe fitting 50 for the unwinding pipe section that the unwinding pipe section 5 has is at least one of other pipes, other pipe fittings for the unwinding pipe section having a similar configuration to the pipe fitting 50 for the unwinding pipe section according to the embodiment, and fittings such as elbows, sockets, and tees. When the unwinding pipe section 5 has these members, the installation area of the unwinding pipe section 5 can be expanded.

Here, for the pipe fitting 50 for the unwinding piping section, the one described in the patent application (Patent Application No. 2020-145364) filed by the present applicants (sometimes referred to as a “flexible fitting” in this specification) can be suitably used.
Fig. 4 is a schematic side view (before assembly) of the pipe fitting for the unwinding piping according to the present embodiment, and Fig. 5 is a schematic side view (after assembly) of the pipe fitting for the unwinding piping according to the present embodiment. In Fig. 4 and Fig. 5, in order to facilitate understanding, a part of each member is drawn transparently as appropriate so that the members covered by those members can be seen. As shown in Fig. 4 and Fig. 5, the pipe fitting for the unwinding piping 50 according to the present embodiment is a pipe fitting for the unwinding piping used in the gas-based fire extinguishing system 1, and includes a bellows pipe 51 having a pipe wall in which peaks and valleys are repeated, and a reinforcing member 52 wound around the bellows pipe 51, the bellows pipe 51 being flexible, the valleys of the bellows pipe 51 being a continuous groove extending in a spiral shape, and the reinforcing member 52 being wound around the bellows pipe 51 along the valleys of the bellows pipe 51. The pipe joint 50 for the unwinding piping section (bellows pipe 51) is flexible and can be bent into various shapes.

In addition to the bellows tube 51 and the reinforcing member 52, the pipe fitting 50 for the unwinding piping section in this embodiment may have an extension suppression member 53 that covers the outer surface of the bellows tube 51 and suppresses the extension of the bellows tube 51, a first jig fixing ring 54a provided on one end side of the bellows tube 51, a second jig fixing ring 54b provided on the other end side of the bellows tube 51, a cylindrical hollow member 55 connected to one end of the bellows tube 51, a nut 56 rotatably attached to the hollow member 55, a first mounting member 57a that screws into the nut 56, and a second mounting member 57b that is joined to the second jig fixing ring 54b.
The details will be explained below.

The bellows pipe 51 is a hollow member. The bellows pipe 51 is sometimes called a tube. The extinguishing agent gas supplied from the fire extinguishing piping 3 passes through the inside (hollow portion) of the bellows pipe 51. The bellows pipe 51 can be manufactured, for example, by bending (or rolling or winding) a metal plate into a tube shape (cylindrical shape) to produce a cylindrical pipe, and then using a device such as a die to shape the pipe wall of the cylindrical pipe into a shape in which peaks and valleys are repeated. The material of the bellows pipe 51 can be, for example, stainless steel, or more specifically, an alloy steel containing chromium and nickel. When the alloy steel is used, the chromium content of the total weight of the bellows pipe 51 is, for example, 18% or more.

The wall of the bellows pipe 51 has a shape in which peaks and valleys are repeated. These peaks and valleys are sometimes called "pleats," or convex portions and concave portions. The bellows pipe 51 may expand due to the pressure of the extinguishing agent gas passing through the bellows pipe 51, but in this embodiment, the expansion of the bellows pipe 51 is suppressed by an expansion suppression member 53, which will be described later.

The bellows pipe 51 is flexible. This allows the pipe fitting 50 for the unwinding pipe section and the pipe fitting 50 for the unwinding pipe section 5 to be bent in response to obstacles between the fire extinguishing pipe 3 and the injection head 4, the distance between the fire extinguishing pipe 3 and the injection head 4, and the like at the site where the gas-based fire extinguishing equipment 1 is installed, and the pipe fitting 50 for the unwinding pipe section and the pipe fitting 50 for the unwinding pipe section 5 can be installed. Therefore, even an unskilled worker can easily connect or join the fire extinguishing pipe 3 and the injection head 4 with the unwinding pipe section 5 according to the situation at the site where the unwinding pipe section 5 is installed. In other words, there is no need to measure the dimensions of the site for each situation at the site, cut out the pipe according to the measured dimensions, or form a thread groove on the cut pipe, and the like. The pipe fitting 50 for the unwinding pipe section can be bent according to the situation at the site to construct the unwinding pipe section 5. Although obstacles and distances may vary depending on the site where the gas-based fire extinguishing system 1 is installed, the flexibility of the bellows pipe 51 allows even an unskilled worker to connect or join the injection head 4 and the fire extinguishing piping 3 according to the various conditions at the site.

FIG. 6 is an enlarged view of the bellows tube 51 and the reinforcing member 52. As shown in FIG.
In Fig. 6 , the arrows are shown to explain the state of helical extension. As shown in Fig. 6 , the valley portion of the bellows tube 51 is a continuous groove extending in a helical shape. A reinforcing member 52, which will be described later, is wound around the bellows tube 51 along the valley portion of the bellows tube 51. When a plurality of valley portions are independent in the pipe wall of the bellows tube 51, it is necessary to provide a plurality of independent reinforcing members 52 for each valley portion and fix each reinforcing member 52 to each valley portion of the bellows tube 51. However, according to this embodiment, the reinforcing member 52 is inserted into a continuous groove extending in a helical shape, and the bellows tube 51 is compressed, whereby the reinforcing member 52 can be easily sandwiched in the valley portion (i.e., in the recess that becomes the valley portion) and the reinforcing member 52 can be closely fixed to the valley portion.

The thickness T1 of the bellows tube 51 is preferably 0.5 mm or less, more preferably 0.35 mm or less, so as not to impair the flexibility of the bellows tube 51. On the other hand, the thickness T1 of the bellows tube 51 is preferably 0.2 mm or more, more preferably 0.25 mm or more, so as to provide the bellows tube 51 with pressure resistance. In general, the thickness T1 of the bellows tube 51 is increased to satisfy the pressure resistance, but within the above numerical range (even at the upper limit of 0.5 mm), there is a risk that the bellows tube 51 will not be able to meet the pressure resistance required for gas extinguishing. However, if the thickness T1 of the bellows tube 51 is made larger than the upper limit (0.5 mm) of the above numerical range, there is a risk that the flexibility of the bellows tube 51 will be impaired. Therefore, in this embodiment, a reinforcing member 52 is provided in the valley portion of the bellows tube 51, thereby achieving both flexibility and pressure resistance of the bellows tube 51.

The reinforcing member 52 is a member that is wound around the bellows tube 51 to reinforce the pressure resistance of the bellows tube 51, and is provided in the valley of the bellows tube 51. By providing such a reinforcing member 52, it is possible to prevent loss of flexibility due to the disturbance of the bellows tube 51 caused by the increase in pressure when the extinguishing agent gas passes through (the shape of the peaks and valleys (the shape of the pleats) of the bellows tube 51 is deformed by elongation, etc.), and to improve the pressure resistance. As described above, in order to give the bellows tube 51 flexibility, it is effective to keep the wall thickness T1 of the bellows tube 51 to a level that does not impair the flexibility of the bellows tube 51, but doing so makes it impossible to give the bellows tube 51 sufficient pressure resistance. In general, in the case of gas extinguishing, the pressure inside the piping is greater than in the case of water extinguishing or foam extinguishing, so it is necessary to give the bellows tube 51 a pressure resistance greater than in the case of water extinguishing or foam extinguishing. Therefore, in this embodiment, the reinforcing member 52 is wound around the bellows tube 51, thereby imparting sufficient pressure resistance while providing the bellows tube 51 with a suitable degree of flexibility. The maximum operating pressure of the bellows tube 51 when the reinforcing member 52 is wound around it is preferably, for example, 2 MPa or more and 10.8 MPa or less, and more preferably, 3.8 MPa or more and 10.8 MPa or less.

The reinforcing member 52 is preferably sandwiched in the valley of the bellows tube 51. That is, it is sandwiched and held by the inner wall of the valley (recess). The holding by the valley can be realized, for example, by providing the reinforcing member 52 in the valley and then compressing the bellows tube 51 (that is, compressing the bellows tube 51 so that the length of the bellows tube 51 in the longitudinal direction is shortened). When the bellows tube 51 is compressed, the width P of the valley of the bellows tube 51 becomes substantially equal to the width of the reinforcing member 52. In this way, the reinforcing member 52 is in close contact with the valley of the bellows tube 51, so that the reinforcing member 52 can be installed in a predetermined position (for example, the reinforcing member 52 can be arranged so as not to protrude more than necessary from the valley of the bellows tube 51). Therefore, it is possible to suppress the substantial outer diameter of the bellows tube 51 (that is, the outer diameter of the bellows tube 51 specified after considering the wound reinforcing member 52 as a part of the bellows tube 51 and including the wire diameter of the reinforcing member 52) from expanding. In other words, by wrapping the reinforcing member 52 around the bellows pipe 51, the outer diameter of the bellows pipe 51 itself does not increase, but the wire diameter of the reinforcing member 52 can prevent the bellows pipe 51 from essentially expanding in the circumferential direction. In addition, deformation of the bellows pipe 51 due to pressure when the extinguishing agent gas passes through the pipe fitting 50 for the unwinding piping (specifically, the bellows pipe 51) can be prevented.

As described above, when the valleys of the bellows tube 51 are independent, it is necessary to provide multiple independent reinforcing members 52 for each valley and fix each of them to each valley of the bellows tube 51. However, according to this embodiment, one reinforcing member 52 can be inserted into a continuous groove formed by a plurality of valleys continuing in a spiral shape, and the bellows tube 51 can be compressed to fix it to the valley. If two or more reinforcing members 52 are inserted into a continuous groove formed by a plurality of valleys continuing, the pressure resistance can be further improved. However, if the number of reinforcing members 52 is increased more than necessary, the flexibility of the bellows tube 51 is impaired. Therefore, it is preferable that the number of reinforcing members 52 wrapped around the bellows tube 51 is a number that does not impair the flexibility of the bellows tube 51. In this embodiment, one reinforcing member 52 is wrapped around the bellows tube 51.

The reinforcing member 52 is preferably made of a wire with a circular cross section or a metal wire, and is particularly preferably made of a material with strength and corrosion resistance equal to or greater than that of the bellows tube 51. If the bellows tube 51 is made of stainless steel, the wire or metal wire can also be made of stainless steel, for example.

As described above, each reinforcing member 52 is made of a linear member such as a wire or a metal wire, and therefore the reinforcing member 52 can be called a "reinforcing wire."

The extension suppression member 53 covers the outer surface of the bellows tube 51 and suppresses the extension of the bellows tube 51. The extension suppression member 53 is sometimes called a braid. When internal pressure is applied to the bellows tube 51, the bellows tube 51 has the property of extending in the length direction and returning to a straight pipe. If the shape of the peaks and valleys (the shape of the pleats) of the bellows tube 51 becomes distorted, the inherent flexibility of the bellows tube 51 is lost. The extension suppression member 53 is, for example, braided into a cylindrical shape and covers the outer circumference of the bellows tube 51 so as to be in close contact with the bellows tube 51. The extension suppression member 53 is fixed (e.g., firmly fixed) at both ends of the bellows tube 51 by welding, crimping, crimping, or a combination of one or more of these methods. In other words, by fixing one end of the elongation suppression member 53 to one end of the bellows tube 51, and the other end of the elongation suppression member 53 to the other end of the bellows tube 51 in the above-mentioned manner, it is possible to suppress the elongation of the bellows tube 51. The elongation suppression member 53 can be made, for example, by weaving stainless steel wire or strip material and ordinary steel wire.

The first jig fixing ring 54a and the second jig fixing ring 54b are the parts where the jig (a jig for attaching the pipe fitting 50 for the unwinding piping section to a building material, etc.) is fixed. In other words, the pipe fitting 50 for the unwinding piping section can be fixed at the construction site by fixing the jig to the first jig fixing ring 54a or the second jig fixing ring 54b and fixing the fixed jig to a building material, etc. at the construction site of the pipe fitting 50 for the unwinding piping section. The first jig fixing ring 54a and the second jig fixing ring 54b are sometimes called braid holding rings because they are provided to hold down one end or the other end of the extension suppression member 53 (braid). The first jig fixing ring 54a is provided on one end side (fire extinguishing piping 3 side) of the bellows pipe 51. The second jig fixing ring 54b is provided on the other end side (the injection head 4 side) of the bellows tube 51. The first jig fixing ring 54a and the second jig fixing ring 54b are hollow members. The bellows tube 51 and the extension suppression member 53 that covers its outer surface are inserted into the hollow portion.

The first jig fixing ring 54a and the second jig fixing ring 54b can be fixed to the outer surface of the elongation suppression member 53 by, for example, welding, crimping, crimping, or a combination of one or more of these methods. The outer shape of the first jig fixing ring 54a and the second jig fixing ring 54b is, for example, a cylindrical shape or a polygonal prism shape, but is not particularly limited.

Due to the reaction (radiation reaction force) when the extinguishing gas is released during a fire, the bellows pipe 51 moves wildly, causing the position of the injection head 4 to become unstable. In order to suppress this movement, a jig is required to firmly fix the bellows pipe 51 to the construction materials at the construction site. The reaction force when the extinguishing gas is released is much larger than that of general water-based fire extinguishing equipment, and the fixing jig is also large and needs to be fixed with a dedicated metal fitting. Therefore, assuming the use of various jigs, it is preferable that the first jig fixing ring 54a and the second jig fixing ring 54b are both longer than those used in water extinguishing and foam extinguishing. Specifically, it is preferable that the length is between 2 and 10 times that of water extinguishing and foam extinguishing. More specifically, it is preferable that the length of the first jig fixing ring 54a and the second jig fixing ring 54b is between 50 mm and 200 mm.

The hollow member 55 is a cylindrical member. The hollow member 55 is fixed to the end of the bellows tube 51 by a method such as welding or adhesive. The boundary between the hollow member 55 and the bellows tube 51 may or may not be covered by the first jig fixing ring 54a and the second jig fixing ring 54b.

A hollow member 55 is connected to one end of the bellows pipe 51 (specific example of connection: joining by welding or the like), and a nut 56 is inserted into the hollow member 55. The hollow member 55 may be called a sleeve or the like. The hollow member 55 has a convex portion X, and the nut 56 is movable in the length direction of the hollow member 55 between the first jig fixing ring 54a and the convex portion X. That is, the nut 56 can be moved in the left-right direction in FIG. 5 between the first jig fixing ring 54a and the convex portion X. In this way, in this embodiment, the first mounting member 57a (the mounting member on the fire extinguishing piping 3 side) is not joined (welded or the like) to the bellows pipe 51, but the nut 56 is provided between the bellows pipe 51 and the first mounting member 57a.

The nut 56 is rotatably attached to the hollow member 55. As a result, when attaching the first attachment member 57a to the fire extinguishing piping 3 (or a member connected to the fire extinguishing piping 3, such as a joint such as an elbow, socket, or tee. Hereinafter, the fire extinguishing piping 3 or a member connected to the fire extinguishing piping 3 will be referred to as "fire extinguishing piping 3, etc."), the first attachment member 57a can be connected or coupled to the pipe joint 50 for the unwinding piping section by simply rotating the nut 56 without rotating the entire pipe joint 50 for the unwinding piping section.

It is preferable that the nut 56 is attached to the hollow member 55 so that it can be tilted (i.e., it can be rotated and tilted) in addition to being rotatable. Specifically, it is preferable that a gap Q (play) is provided between the opening of the nut 56 and the outer surface of the hollow member 55 so that the nut 56 can be tilted slightly. In this way, even if the fire extinguishing piping 3 or the like is tilted, the first mounting member 57a can be attached to the fire extinguishing piping 3 or the like in accordance with the inclination (angle) of the fire extinguishing piping 3 or the like, and the nut 56 can be attached to the first mounting member 57a in accordance with the inclination (angle) of the first mounting member 57a. If the nut 56 can be tilted slightly, even if the fire extinguishing piping 3 etc. is slightly tilted, the first mounting member 57a can be attached to the fire extinguishing piping 3 etc. in accordance with the tilt (angle) of the fire extinguishing piping 3 etc., and then the first mounting member 57a can be attached to the nut 56 by tilting the nut 56 without tilting the entire pipe fitting 50 for the unwinding piping section (particularly the bellows pipe 51).

The nut 56 has, for example, a screw groove formed on the inside. This screw groove screws into a screw groove provided on the outer surface of the first mounting member 57a. In this embodiment, the nut 56 and the hollow member 55 are provided only on the fire extinguishing piping 3 side, but the nut 56 and the hollow member 55 can also be provided on the injection head 4 side. In this case, the nut 56 and the hollow member 55 on the fire extinguishing piping 3 side are referred to as the first nut and the first hollow member, and the nut and the hollow member on the injection head 4 side are referred to as the second nut and the second hollow member. The second hollow member is connected to the other end of the bellows pipe (specific example of connection: joining by welding, etc.). The second nut and the second hollow member have the same configuration and function as the nut 56 and the hollow member 55 on the fire extinguishing piping 3 side.

It is preferable to use a cap nut, for example, for the nut 56.

The first mounting member 57a (the mounting member on the fire extinguishing piping 3 side) is a member for mounting the pipe fitting 50 for the unwinding piping section to the fire extinguishing piping 3, etc. The second mounting member 57b (the mounting member on the injection head 4 side) is a member for mounting the pipe fitting 50 for the unwinding piping section to the injection head 4 (or a member connected to the injection head 4, such as an elbow, socket, or tee joint. Hereinafter, the injection head 4 or a member connected to the injection head 4 will be referred to as the "injection head 4, etc."). Examples of the mounting method include screwing, fitting, or a combination of these. When mounting by screwing, a thread groove is provided, for example, on the inner surface of the first mounting member 57a or the second mounting member 57b.

When the pipe fitting 50 for the unwinding piping section has the above-mentioned nut 56 (first nut) on the fire extinguishing piping 3 side, the first attachment member 57a is attached to the first nut by screwing. When the pipe fitting 50 for the unwinding piping section has a second nut having the same configuration and function as the above-mentioned nut 56 on the injection head 4 side, the second attachment member 57b is attached to the second nut by screwing. When the pipe fitting 50 for the unwinding piping section has the above-mentioned nut 56 (first nut) only on the fire extinguishing piping 3 side and does not have a (second nut) having the same configuration and function as the above-mentioned nut 56 on the injection head 4 side, the second attachment member 57b is joined to the bellows pipe 51 by welding or the like.

The distance between the end of the first mounting member 57a and the end of the second mounting member 57b, i.e., the overall length L of the pipe joint (flexible joint) 50 for the unwinding piping section, is not particularly limited, but is preferably 2000 mm or less. In this way, when the pipe joint 50 for the unwinding piping section according to the embodiment is used as a horizontal pipe, support for the pipe joint 50 for the unwinding piping section is not required.

The first mounting member 57a may be called an adapter. The second mounting member 57b may be called a nipple when it is joined to the bellows tube 51 by welding or the like, and may be called an adapter like the first mounting member 57a when it is attached to the second nut by screwing. When the second mounting member 57b functions as a nipple, it is a member that is joined to the bellows tube 51 by welding or the like, and is connected to the injection head or the like by a screw connection. When the second mounting member 57b and the bellows tube 51 are joined by welding or the like, the bellows tube 51 is rotated to connect the second mounting member 57b to the injection head 4 or the like.

According to the pipe fitting 50 for the unwinding piping section described above, since the bellows pipe 51 has flexibility, even an unskilled worker can install the unwinding piping section 5 according to the conditions at the construction site of the gas-based fire extinguishing equipment 1. In addition, since at least one reinforcing member 52 (a number of reinforcing members that does not impair the flexibility of the bellows pipe 51) is wound around the bellows pipe 51 so as to follow the valley portion of the bellows pipe 51, the pressure resistance of the bellows pipe 51 can be ensured while providing flexibility to the bellows pipe 51. Therefore, it is possible to provide a pipe fitting 50 for the unwinding piping section that can be easily installed while ensuring pressure resistance, and a gas-based fire extinguishing equipment 1 using the same.

In this embodiment, the nut 56 and the first mounting member 57a are connected by parallel threads, so that connection and removal can be easily performed. In addition, the nut 56 is loosely fitted to the hollow member 55 in advance, and can rotate and move back and forth freely. The sleeve of the hollow member 55 is joined to the bellows tube 51 by welding or the like. When connecting to the fire extinguishing piping 3, etc., only the first mounting member 57a can be removed from the nut 56, and only the first mounting member 57a can be connected to the fire extinguishing piping 3, etc. When connecting the first mounting member 57a to the bellows tube 51, the nut 56 integrated with the bellows tube 51 is placed on the first mounting member 57a connected to the fire extinguishing piping 3, etc., and the connection can be performed simply by rotating only the nut 56. Unlike when connecting the second mounting member 57b to the injection head 4, etc., there is no need to rotate the bellows tube 51, which has the advantage of making the work easier.

In the conventional unwinding piping used in the gas-based fire extinguishing equipment 1, in order to accurately attach the injection head 4 to the hole position of the ceiling board, multiple steel pipes and joints such as elbows must be combined to adjust the position and screwed in multiple times. However, the alignment when constructing this unwinding piping requires skilled techniques, and it takes time to cut out the pipes with accurate dimensions, which places a burden on the constructor. In addition, earthquake-resistant ceiling construction is required so that business can be quickly restored even if an unexpected event such as an earthquake occurs. As explained in this embodiment, the unwinding piping has a flexible bellows pipe 51, so that the screwing work of multiple steel pipes can be completed in one screwing work, which leads to simplified construction and reduced time. In general, gas fire extinguishing, which has a significantly higher operating pressure than water fire extinguishing, requires a large pressure resistance, so it was necessary to use one with poor flexibility. However, according to this embodiment, by providing a reinforcing member 52 in the valley portion of the flexible bellows pipe 51, it is possible to provide a unwinding piping for a gas fire extinguishing equipment that is both pressure-resistant and flexible. In addition, the gas-based fire extinguishing system unwinding piping section 5 according to this embodiment, which is equipped with a flexible bellows pipe 51, can absorb the phase shift that occurs when vibrations such as earthquakes occur between the fire extinguishing piping 3 fixed to the compartment and the injection head 4 fixed to the ceiling substrate. This improves the earthquake resistance of the ceiling.

Incidentally, it has been found that when a flexible joint is used for the pipe joint 50 for the unwinding piping section of the gas-based fire extinguishing equipment 1, a peculiar noise is generated when the extinguishing gas passes through the bellows section of the flexible joint (flexible bellows pipe 51), and this noise may be released from the spray head through the flexible joint together with the extinguishing gas.
Below, we will explain a specific example of a reeling piping structure for a gas-based fire extinguishing equipment that can reduce noise generated when extinguishing agent gas passes through a pipe fitting 50 for the reeling piping section, which is made of a flexible fitting, and a method of using the reeling piping for a gas-based fire extinguishing equipment.

An example of a gas-based fire extinguishing system that employs an unreeling piping structure for a gas-based fire extinguishing system for reducing noise generated when the extinguishing agent gas passes through a pipe joint 50 for the unreeling piping section made of a flexible joint is shown in Figures 7 and 8.
This gas-based fire extinguishing system 1 is basically configured such that, in the unwinding piping structure of the gas-based fire extinguishing system 1, a flexible joint having a structure for reducing the particular noise generated when the extinguishing agent gas passes through the bellows is used for the pipe joint 50 for the unwinding piping section of the unwinding piping section 5, and also that the injection head 4 has a sound-absorbing function, preferably an injection head 4 equipped with a sound-absorbing member 41 made of a porous material.

Specifically, as shown in Figures 9 to 11 and Figure 19 described later, the structure for reducing this particular noise can be realized by making the diameter (inner diameter of the valley portion) of the bellows portion of the flexible joint that constitutes the pipe joint 50 for the unwinding piping section 5 of the unwinding piping section 5 equal to or larger than the diameter (inner diameter) of the first mounting member 57a as the gas inlet side mounting section and/or the second mounting member 57b as the gas outlet side mounting section, thereby reducing the flow rate of the extinguishing agent gas passing through the bellows portion.
More specifically, as shown in FIG. 9 , the shape of the first mounting member 57a serving as the gas inlet side mounting portion that connects to a branch pipe (not shown) of the fire extinguishing piping 3 can be configured to include a narrowing portion and expand toward the bellows pipe 51, and the shape of the second mounting member 57b serving as the gas outlet side mounting portion that connects the spray head 4 can be configured to narrow toward the spray head 4 and include a narrowing portion.
In addition, as shown in FIG. 10 , the shape of the first mounting member 57a serving as the gas inlet side mounting portion connected to a branch pipe (not shown) of the fire extinguishing piping 3 can be configured to have a narrowing portion and gradually expand toward the bellows pipe 51, and the shape of the second mounting member 57b serving as the gas outlet side mounting portion connected to the injection head 4 can be configured to gradually narrow toward the injection head 4 and have a narrowing portion.
In addition, the shape of the bushing 58a, which connects the branch pipe 31 of the fire extinguishing piping 3 and the first mounting member 57a as the gas inlet side mounting portion, can be configured to have a narrowed portion and to be connected to the first mounting member 57a via a socket 58b that expands toward the bellows pipe 51.
In this case, it is preferable that the bore (inner diameter of the valley) of the bellows portion of the bellows pipe 51 of the flexible joint constituting the pipe joint 50 for the unwinding pipe 5 be 20A to 50A (nominal diameter).
This not only reduces the specific noise but also reduces the pressure loss when the extinguishing gas is ejected at a high flow rate.

Table 1 shows the results of an experiment investigating the relationship between the diameter (inner diameter of the valley portion) (nominal diameter: 20A, 32A) of the bellows portion of the bellows pipe 51 of the flexible joint that constitutes the pipe joint 50 for the unwinding piping section 5 of the unwinding piping section 5 and the diameter (inner diameter) (nominal diameter: 20A) of the second mounting member 57b as the gas outlet side mounting section, and sound pressure.
From the results of this experiment, it was confirmed that the effect of reducing noise can be achieved by making the diameter (inner diameter of the valley portion) of the bellows portion of the bellows tube 51 of the flexible joint that constitutes the pipe joint 50 for the unwinding piping section 5 greater than or equal to the diameter (inner diameter) of the second mounting member 57b as the gas outlet side mounting section.

In addition to the above embodiments, a structure for reducing peculiar noise can be achieved by mounting the flexible joint constituting the pipe joint 50 for the unwinding piping section 5 of the unwinding piping section 5 so that the angle α between the axial direction of the first mounting member 57a as the gas inlet side mounting portion and the axial direction of the second mounting member 57b as the gas outlet side mounting portion is 0° to 90°, as shown in Figure 12.
Here, the "angle α" has a tolerance of about ±5° as a construction error.
The installation form of the pipe fitting 50 for the unwinding piping section 5 of the unwinding piping section 5 is not limited to the installation form shown in FIG. 12 , and various installation forms, for example, as shown in FIG. 13 , can be adopted depending on the positional relationship between the fire extinguishing piping 3 (branch pipe 31) fixed to the compartment and the jet head 4 fixed to the ceiling base section.

Table 2 shows the results of an experiment investigating the relationship between the angle α (90°, 180°) between the axial direction of the first mounting member 57a as the gas inlet side mounting portion of the flexible joint that constitutes the pipe fitting 50 for the unwinding piping section 5 of the unwinding piping section 5 and the axial direction of the second mounting member 57b as the gas outlet side mounting portion, and sound pressure.
From the results of this experiment, it was confirmed that the effect of reducing noise can be achieved by setting the angle α between the axial direction of the first mounting member 57a as the gas inlet side mounting portion of the flexible joint that constitutes the pipe fitting 50 for the unwinding piping section 5 of the unwinding piping section 5 and the axial direction of the second mounting member 57b as the gas outlet side mounting portion to 90° or less.

In this case, as shown in Figures 14 and 15, when the axial direction of the first mounting member 57a as the gas inlet side mounting portion of the flexible joint that constitutes the pipe fitting 50 for the unwinding piping section 5 of the unwinding piping section 5 and the axial direction of the second mounting member 57b as the gas outlet side mounting portion are attached so as to be parallel, it is preferable that the flexible joint is attached so that the axis of the gas inlet side mounting portion is the center and the axial perpendicular displacement is within a range of 0.3L, and the end face of the gas outlet side mounting portion is within a range of 0.7L to 1.0L from the end face of the gas inlet side mounting portion, with respect to the total length L of the flexible joint.
Here, "parallel" has an allowable range of approximately ±5° as a construction error.

Furthermore, as shown in Figures 16 and 17, when the axial direction of the first mounting member 57a as the gas inlet side mounting portion of the flexible joint constituting the pipe fitting 50 for the unwinding piping section 5 of the unwinding piping section 5 and the axial direction of the second mounting member 57b as the gas outlet side mounting portion are mounted at right angles, it is preferable that, with respect to the total length L of the flexible joint, the axial perpendicular displacement from the axis of the gas inlet side mounting portion or the axis of the gas outlet side mounting portion is within a range of 0.5L, and that the end face of the gas outlet side mounting portion or the gas inlet side mounting portion is mounted within a range of 0.5L to 0.9L from the end face of the gas inlet side mounting portion or the gas outlet side mounting portion.
Here, the "right angle" has an allowable range of about ±5° as a construction error.

As shown in Figures 18 and 19, a structure that reduces the characteristic noise can be achieved by having the flexible joint that constitutes the pipe joint 50 for the unwinding piping section 5 of the unwinding piping section 5 have a steel pipe section 59a or reducer 59b made of a straight pipe, and by setting the ratio of the length of the bellows section of the bellows pipe 51 to the total length L of the flexible joint small, specifically, 70% or less, preferably 60% or less, and more preferably 50% or less (50% in the embodiment shown in Figure 18, and 43% in the embodiment shown in Figure 19).

The gas-based fire extinguishing system 1 can be configured with at least one or more of the above-mentioned winding piping structures of each gas-based fire extinguishing system.

The method of using the unwinding piping of a gas-based fire extinguishing system to reduce noise generated when extinguishing gas passes through the pipe fitting 50 for the unwinding piping section, which is made of a flexible joint, is a method of using the unwinding piping of a gas-based fire extinguishing system 1, which uses a flexible joint in a usage method that reduces the noise that is specific to when extinguishing gas passes through the bellows of the pipe fitting 50 for the unwinding piping section of the unwinding piping section 5, and is basically based on using an injection head 4 with a sound-absorbing function, preferably an injection head 4 with a sound-absorbing member 41 made of a porous material.

Specifically, the method of reducing this particular noise can be achieved by limiting the flow rate of the extinguishing gas flowing into the gas inlet side mounting part of the flexible joint to a specified amount or less.

In this case, it is preferable to limit the set maximum flow rate of the extinguishing gas flowing into the gas inlet side mounting portion of the flexible joint to 70% or less of the set maximum flow rate when no flexible joint is used.

According to this gas-based fire extinguishing equipment unwinding piping structure and its method of use, by using a flexible joint, it is possible to enjoy the advantages of simplified installation and time saving that flexible joints have, while reducing the noise generated when the fire extinguishing gas passes through the bellows of the flexible joint, and it is possible to prevent noise (vibrations) emitted from the injection head from adversely affecting precision equipment such as HDDs present in the area to be extinguished (e.g., a server room).

The above describes the reeling piping structure of a gas-based fire extinguishing system and the method of using the reeling piping of a gas-based fire extinguishing system of the present invention based on the embodiments, but the present invention is not limited to the configurations described in the above embodiments, and the configurations can be changed as appropriate within the scope of the spirit of the invention, such as by appropriately combining the configurations described in each embodiment.

The reeling piping structure for a gas-based fire extinguishing equipment and the method of using the reeling piping for a gas-based fire extinguishing equipment of the present invention use a flexible joint that has flexibility, thereby enjoying the advantages of simplified installation and time saving that are associated with flexible joints, while reducing the noise generated when the extinguishing agent gas passes through the bellows section of the flexible joint. As a result, the present invention can be widely used in applications for gas-based fire extinguishing equipment that use extinguishing agent gases such as halide gases and inert gases (inert gases), and the application is not limited to newly installed gas-based fire extinguishing equipment, but can also be applied to the renovation of existing gas-based fire extinguishing equipment.

REFERENCE SIGNS LIST 1 Gas-based fire extinguishing equipment 2 Storage container 3 Fire extinguishing piping 31 Branch pipe 4 Injection head 5 Unrolling piping section 50 Pipe joint for unrolling piping section (flexible joint)
51 Bellows tube (bellows part)
52 Reinforcing member 53 Elongation suppressing member 54a First jig fixing ring 54b Second jig fixing ring 55 Hollow member 56 Nut 57a First mounting member 57b Second mounting member 58a Bushing 58b Socket 59a Steel pipe section 59b Reducer X Convex portion of hollow member L Total length of pipe joint (flexible joint) for unwinding piping section (distance between end of first mounting member and end of second mounting member)
P: Distance between the valleys of the bellows tube (bellows section) T1: Wall thickness of the bellows tube (bellows section)

Claims (11)

In the roll-out piping structure of a gas-based fire extinguishing system, a metal bellows is provided in the roll-out piping section.
The present invention relates to a gas-based fire extinguishing system having a gas-based fire extinguishing equipment winding piping structure, characterized in that the winding piping structure uses a flexible joint having a bellows portion and is configured to reduce the specific noise generated when extinguishing agent gas passes through the bellows portion, the flexible joint is attached so that the angle α between the axial direction of the gas inlet side mounting part and the axial direction of the gas outlet side mounting part of the flexible joint is 0° to 90°, and the injection head is equipped with a sound-absorbing function. The unwinding piping structure of a gas-based fire extinguishing system according to claim 1, characterized in that the diameter of the bellows portion of the flexible joint is equal to or larger than the diameter of the gas inlet side mounting portion and/or the gas outlet side mounting portion, so as to reduce the flow rate of the extinguishing agent gas passing through the bellows portion. The unwinding piping structure for a gas-based fire extinguishing system according to claim 2, characterized in that the diameter of the bellows portion of the flexible joint is 20A to 50A. The reel-out piping structure for a gas-based fire extinguishing equipment as described in claim 1, characterized in that when the axial direction of the gas inlet side mounting part and the axial direction of the gas outlet side mounting part are installed so as to be parallel, the axial perpendicular displacement is within a range of 0.3L around the axis of the gas inlet side mounting part with respect to the total length L of the flexible joint, and the end face of the gas outlet side mounting part is installed within a range of 0.7L to 1.0L from the end face of the gas inlet side mounting part. The reel-out piping structure for a gas-based fire extinguishing equipment as described in claim 1, characterized in that when the axial direction of the gas inlet side mounting part and the axial direction of the gas outlet side mounting part are mounted at right angles, the axial perpendicular displacement from the axis of the gas inlet side mounting part or the axis of the gas outlet side mounting part is within a range of 0.5L relative to the total length L of the flexible joint, and the end face of the gas outlet side mounting part or the gas inlet side mounting part is mounted within a range of 0.5L to 0.9L from the end face of the gas inlet side mounting part or the gas outlet side mounting part. The reel-out piping structure of a gas-based fire extinguishing equipment as described in claim 1, characterized in that the flexible joint has a steel pipe section or a reducer, and the ratio of the length of the bellows section to the total length L of the flexible joint is 70% or less . The unwinding piping structure for a gas-based fire extinguishing system according to claim 6, characterized in that the flexible joint has a jig fixing ring having a length of 50 mm to 200 mm that covers both ends of the bellows portion. A gas-based fire extinguishing system comprising at least one or more of the unwinding piping structures of the gas-based fire extinguishing system described in any one of claims 1 to 7. A method for using the reel-out piping of a gas-based fire extinguishing system, comprising the steps of : using a flexible joint with a metal bellows portion in the reel-out piping section; attaching the flexible joint so that the angle α between the axial direction of a gas inlet side mounting portion and the axial direction of a gas outlet side mounting portion of the flexible joint is 0° to 90°; and using a spray head equipped with a sound-reduction function as the spray head, in order to reduce noise peculiar to when extinguishing agent gas passes through the bellows portion. The method for using the unwinding piping of a gas-based fire extinguishing system according to claim 9, characterized in that the flow rate of the extinguishing gas flowing into the gas inlet side mounting part of the flexible joint is limited to a predetermined amount or less. A method for using the reel-out piping of a gas-based fire extinguishing system as described in claim 10, characterized in that the set maximum flow rate of the extinguishing agent gas flowing into the gas inlet side mounting portion of the flexible joint is limited to 70% or less of the set maximum flow rate when no flexible joint is used.

Images