JP4932812B2 - Bubble fire extinguisher mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a stable mixture ratio in a change of an ambient temperature or in the use of a foam fire-extinguishing agent of high kinetic viscosity in a mixing device for foam fire-extinguishing apparatus. <P>SOLUTION: A shaft 8 is provided between an inflow port 4 of a foam fire-extinguishing agent and a water inflow port 3, and is equipped with a valve member making contact with respective inflow ports at an end. The valve member 7 of the foam fire-extinguishing agent of the shaft 8 includes a cylinder 15 having a communicating port 13 communicating with the inflow port 4 of a foam fire-extinguishing agent and an opening 14a and a cylindrical valve 16 for the foam fire-extinguishing agent which slides inside the opening 14a of the cylinder 15 and has a slit 16b extending in the longitudinal direction in a side part 16a. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a mixer for mixing water and a foam fire-extinguishing agent used in a foam fire-extinguishing facility.

Conventionally, foam fire extinguishing equipment has been installed in places where there is a risk of oil fires such as oil tanks. The foam fire extinguishing equipment mixes the raw liquid tank in which the foam fire extinguishing agent is stored, the pressurized water supply device that supplies water from the water source tank, the water from the pressurized water supply device and the foam fire extinguishing agent in the stock solution tank at a predetermined concentration. It is comprised from the mixer which produces | generates foam aqueous solution, and the foaming machine which discharge | releases foam by supplying foam aqueous solution (for example, refer patent document 1).
Japanese Patent Publication No. 5-74381

  By the way, foam extinguishing agents have various kinematic viscosities depending on the type, but in the case of protein-based foam extinguishing agents having a particularly high kinematic viscosity, the kinematic viscosity greatly changes depending on the temperature environment where the equipment is installed. . That is, the kinematic viscosity of the drug is large during cold periods such as winter, and the kinematic viscosity is small during hot periods such as summer.

  The mixer mixes water and foam extinguishing agent to produce a foam aqueous solution with a predetermined concentration. The standard concentration of the foam aqueous solution is 3%, and the amount of foam extinguishing agent added is water. Very little compared to In such a situation, if the kinematic viscosity of the foam extinguishing agent changes depending on the environmental temperature and the amount of the foam extinguishing agent supplied to the mixer does not reach an appropriate value, it is impossible to generate a foam aqueous solution with a predetermined concentration. .

  In addition, the conventional mixer uses a conical valve that moves back and forth in the opening of the cylinder as a valve for adjusting the supply amount of the foam extinguishing agent as shown in FIG. In this case, as shown in FIG. 6 (b), the gap for adjusting the supply amount of the foam extinguishing agent formed between the valve and the cylinder opening serving as the valve port forms an annular shape around the periphery of the conical valve. However, when the area of the gap is reduced, the gap size is very short when the area of the gap is reduced, but the gap is very narrow. For this reason, when the kinematic viscosity of the foam extinguishing agent is high, it becomes difficult for the extinguishing agent to pass through the narrow gap, the supply amount of the foam extinguishing agent is insufficient, the mixing concentration becomes thin, and a foam aqueous solution of a predetermined concentration is generated It may not be possible. 6A and 6B show a cylinder and a valve portion of a conventional mixer. FIG. 6A is a perspective view and FIG. 6B is a cross-sectional view including an annular gap portion formed therebetween.

  In view of the above circumstances, in the mixer of a foam fire-extinguishing apparatus, the present invention can obtain a stable mixing ratio even if the environmental temperature changes or a foam having a high kinematic viscosity is used. The purpose is to.

This invention mixes the foam fire-extinguishing agent flowing in from the foam-extinguishing agent inflow port and the water flowing in from the water in-flow port to produce a foam aqueous solution, and the foam aqueous solution flows out from the foam-aqueous solution outlet and flows in. A mixer of a foam fire extinguishing equipment that adjusts the amount of the foam fire-extinguishing agent flowing in according to the amount of the water, provided between the foam fire-extinguishing agent inlet and the water inlet and in contact with each inlet A shaft having a valve member at an end thereof is provided, and the valve member of the foam extinguishing agent on the shaft is provided with a cylinder having a communication port and an opening communicating with the foam extinguishing agent inlet, and slides in the opening of the cylinder. and, the rear end with the distal end side is closed facing the cylinder is opened, and constituted by a slit is formed tubular foam agents valve extending lengthwise side, circumferential said slit The width of the direction is toward the rear end side in the length direction A mixer foam equipment, characterized in that the stepped slit which changes stepwise as spreads.

  The present invention is also a mixer of the foam extinguishing equipment, characterized in that the slit is drilled in a direction deflected with respect to the thickness direction of the side portion of the valve for the foam extinguishing agent. It is a mixer for foam fire extinguishing equipment.

Further, the present invention is a support member for supporting a biasing member that constantly biases the water valve member of the shaft in the closing direction, the foam extinguishing agent valve being housed therein, and the foam extinguishing agent The foam fire extinguishing agent outlet is provided at a position facing the slit, and the foam extinguishing agent valve is provided at a position facing the slit. Furthermore , it is a mixer of the foam fire-extinguishing equipment, wherein another slit is formed .

  According to this invention, the valve member of the foam fire extinguishing agent is slid in the opening of the cylinder and the cylinder provided with the communication port and the opening communicating with the inflow port of the foam extinguishing agent, and the side portion in the longitudinal direction. Since it is composed of a cylindrical foam extinguishing agent valve with an extended slit, the inside of the cylinder and the foam extinguishing agent valve can be communicated with each other using the slit of the foam extinguishing agent valve. In addition, it is possible to form a gap whose size can be changed according to the sliding of the foam extinguishing agent valve, that is, a gap for adjusting the supply amount of the foam extinguishing agent, and the gap can be formed in the foam extinguishing agent. It can be formed in a substantially rectangular shape in the slit portion of the valve for use.

  That is, according to this invention, even when the area of the gap for adjusting the supply amount of the foam fire extinguishing agent at a small flow rate of water is small, the gap is concentrated in a substantially rectangular range in the slit portion on the side of the foam extinguishing agent valve. Therefore, unlike the conventional example in which the gap is annular, the area of the gap can be made sufficiently small without making the gap so narrow that the foam with high kinematic viscosity is difficult to flow. A fixed amount of foam fire-extinguishing agent can be supplied, and a foam aqueous solution having a predetermined concentration can be obtained. In other words, the total area of the gap itself through which the foam extinguishing agent passes is the same as the conventional one, but by making the gap formed between the cylinder and the valve rectangular, the gap itself is increased. Even if it is a foam-extinguishing agent that is highly viscous and difficult to flow, the foam-extinguishing agent at a predetermined flow rate can flow.

  Therefore, according to the present invention, a stable mixing ratio can be obtained even if the environmental temperature changes in the mixer of the foam extinguishing equipment or a foam having a high kinematic viscosity is used.

  In addition, according to the present invention, the slit formed in the side portion of the bubble extinguishing agent valve is formed in a direction deflected with respect to the thickness direction of the side portion, that is, offset. Thus, the foam extinguishing agent can be allowed to flow from the slit into the foam extinguishing agent valve so as not to hit the shaft inside thereof, that is, so as not to cause pressure loss. As a result, the flow in the bubble extinguishing agent valve is rectified and the pressure loss is small, so that the aqueous foam solution can be maintained at a predetermined concentration as designed.

  Further, according to the present invention, the cylinder is made of a non-metallic material, for example, resin, rubber, ceramic or the like, so that the corrosion of the cylinder in which the corrosive foam extinguishing agent flows in the state of the stock solution is prevented. Can be prevented. Further, it is possible to prevent the cylinder and the foam extinguishing agent valve from sticking due to corrosion.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view of the mixer of the present invention, FIG. 2 shows a cylinder and a foam extinguishing agent valve portion of the mixer, and FIG. 1 (a) is a sectional view thereof, and FIG. Fig. 3 is a perspective view thereof (a part is cut away to show the inside state), Fig. 3 is a front view of the cylinder portion of the same, and Fig. 4 is a view of the cylinder portion with the filter attached thereto. 5 is a front view, and FIG. 5 shows the same foam extinguishing agent valve portion, where (a) is a cross-sectional view taken along line AA of (b), and (b) is a plan view.

  In FIG. 1, 1 is a mixer, which is provided in a foam fire extinguishing facility, which mixes water and a foam fire-extinguishing agent at a predetermined ratio to produce a foam aqueous solution. This is a so-called proportional mixer configured to keep the mixing ratio of water and foam extinguishing agent constant. That is, it is a mixer that adjusts the amount of the foam fire-extinguishing agent that flows in according to the amount of water that flows in to produce a foam aqueous solution having a predetermined concentration.

  In the mixer 1, the elbow-shaped body 2 as a whole is formed by mixing a water inflow port 3 into which water flows in, a foam extinguishing agent inflow port 4 into which a foam extinguishing agent flows in, and water and a foam extinguishing agent. A foam aqueous solution outlet 5 for allowing the aqueous solution to flow out is provided. The water inlet 3, the foam extinguishing agent inlet 4 and the aqueous foam solution outlet 5 are respectively connected to water supply means, foam extinguishing agent supply means and foam discharge means in a foam extinguishing equipment (not shown).

  Inside the main body 2, there are a water valve member 6 and a foam fire-extinguishing agent valve member 7 for controlling the opening degree of both the inflow ports 3 and 4 between the water inlet 3 and the foam-extinguishing agent inlet 4. The proportional valve member 9 which consists of the shaft 8 each provided with both is provided.

  The proportional valve member 9 is a coil spring that constantly biases the substantially conical valve body 6a of the water valve member 6 toward the valve seat 10 provided inside the water inlet 3, that is, in the closing direction. 11 and a columnar spring guide 12 inside the coil spring 11 are provided. The spring guide 12 has an outer diameter that is substantially the same as the inner diameter of the coil spring 11, and is inscribed in the coil spring 11 to suppress vibration of the coil spring 11 due to water flowing in the main body 2. The coil spring 11 can be prevented from being bent and deformed by a water flow, and the amount of contraction of the coil spring 11 can be limited.

  In the proportional valve member 9, the foam extinguishing agent valve member 7 includes a communication port 13 communicating with the foam extinguishing agent inflow port 4 and an end wall 14 serving as a partition wall between the main body 2 and the end wall thereof. The cylinder 15 provided with the opening 14a formed in 14 and the opening edge of the opening 14a are slidably contacted (as shown in the enlarged view of FIG. The slit 16b that slides in and out of the cylinder 15 and extends in the length direction is formed in the side portion 16a. In the present embodiment, the cylindrical slit is formed in the cylindrical shape, and the tip side facing the cylinder 15 is The foam extinguishing agent valve 16 has a shape that is closed by the distal end wall 16c and opened at the rear end side facing the main body 2.

  Reference numeral 17 denotes a support member that is fixed to the main body 2 at a position facing the spring guide 12 of the main body 2 and supports the coil spring 11, and is formed in a cylindrical shape. The valve | bulb 16 is accommodated and it has the outflow ports 17a and 17b into the main body 2 of a foam fire extinguishing agent.

  The shaft 8 is connected to the valve body 6a via the spring guide 12 on the water valve member 6 side, and slidably penetrates the support member 17 on the foam extinguishing agent valve member 7 side. It passes through the bubble extinguishing agent valve 16 and is fixed to the tip wall 16c. More specifically, the end of the shaft 8 is screwed and fixed to the spring guide 12, and the shaft 8 is connected to a shaft penetrating through the center of the spring guide 12.

  In the bubble extinguishing agent valve 16, the slit 16b is specifically a hole having an elongated, substantially rectangular shape, and the foam extinguishing agent valve 16 slides and moves toward the cylinder 15, As shown in FIGS. 2A and 2B, when the slit 16 b faces the inside of the cylinder 15, there is a slit between the slit 16 b on the tip wall 16 c side and the opening edge of the opening 14 a of the cylinder 15. A substantially rectangular gap S is formed by 16 b, and the inside of the cylinder 15 and the foam extinguishing agent valve 16 can be communicated with each other by the gap S, and the gap S is moved by the movement of the foam extinguishing agent valve 16. The size can be changed according to the situation.

  As described above, the gap in the mixer of the conventional example is formed in an annular shape over a wide range around the conical valve. Therefore, if the area of the gap is reduced, the gap size is very large. It becomes narrow and difficult to pass with a high kinematic viscosity foam. On the other hand, the gap S of the mixer 1 according to the present invention can be formed by concentrating the gap that becomes a communication portion between the inside of the cylinder 15 and the inside of the foam extinguishing agent valve 16 in a substantially rectangular narrow range. Even when the area of the gap S at a small flow rate is small and the foam extinguishing agent has a high kinematic viscosity, the gap dimension of the gap S can be prevented from becoming so narrow that the foam extinguishing agent becomes difficult to pass. The gap S can secure a gap dimension through which the foam can sufficiently pass.

  In the present embodiment, as shown in FIG. 3, the cylinder 15 has four communication ports 13 communicating with the foam extinguishing agent inlet 4 so that the foam extinguishing agent flows into the inside from four directions. Also, as shown in FIG. 4, in order to prevent dust and the like from entering the cylinder 15, it is provided with a screen 18 made of a perforated plate, which is externally mounted on a portion having the communication port 13. Yes.

  The slit 16b can change the width in the circumferential direction in the length direction in order to respond to the change in the amount of water, and the slit 16b may change at a constant change rate. Since it is easy to process as in this embodiment, the width may be changed stepwise so that the width in the circumferential direction gradually increases in the length direction (for example, three steps). Thereby, it can respond to the change of the water quantity by the cone-shaped valve body 6a which has the property to change water quantity rapidly. When a slit having a large width (height) is used, the amount of the stock solution mixed when water is small in flow rate is increased. Therefore, it is preferable to use a stepped slit in this way.

  Further, in the present embodiment, the slit 16b is, as shown in FIG. 5 (a), the direction of the perforation being offset from the thickness direction, in other words, from the direction toward the axis. Is offset from the radial direction of the circular cross-section of the cylindrical foam extinguishing agent valve 16 (shifted) along the tangential direction. As a result, the foam extinguishing agent can be caused to flow through the slits 16b and 16d into the foam extinguishing agent valve 16 so as not to hit the shaft 8 at the axial center position. In this way, the foam fire extinguishing agent flows into the valve 16 along the inner wall surface of the foam extinguishing agent valve 16, so that it is not turbulent in the foam extinguishing agent valve 16, that is, is rectified. In particular, the swirl flow can be reduced, and pressure loss can be reduced. (The mixer that uses the elbow pipe for the main body uses the differential pressure due to the pressure loss of the water flow generated in the elbow part. If the foam extinguishing agent is sucked into the elbow side with water, pressure loss occurs in other parts, and if the design differential pressure is not obtained, the suction action of the foam extinguishing agent can be obtained as expected In other words, it may not be possible to obtain a predetermined mixing ratio, that is, the advantage of being able to reduce the pressure loss is great.) Furthermore, it is possible to make it difficult for the foam fire-extinguishing agent flowing in the foam extinguishing agent valve 16 to flow out of the slit 16b, and to make it difficult for water to flow in from the slit 16b. As shown in FIG. 5, in addition to the slit 16b, another slit 16d is further formed as a slit 16b so that a wider working flow rate range can be obtained so as to cope with a larger flow rate of water. You may form in the position which opposes.

  The support member 17 has a mortar-shaped concave surface 17c on the surface facing the open side end portion 16e of the foam extinguishing agent valve 16 disposed inside. As a result, the flow of the foam fire-extinguishing agent flowing out from the foam-extinguishing agent valve 16 in a swirling state smoothly flows out from the outlets 17a and 17b of the support member 17 into the main body 2 while reducing pressure loss. It can be done. In the support member 17, the outlets 17a and 17b and the slit 16b of the foam extinguishing agent valve 16 may be opposed to each other. However, if the outlets 17a and 17b and the slit 16b are provided so as to be orthogonal to each other, The foam stock solution flowing through the fire extinguishing agent valve 16 becomes even less susceptible to the flow of water.

  The proportional valve member 9 is configured as described above, and at all times, that is, when flowing water is stopped when the inflow of water from the water inlet 3 is stopped, as shown in FIG. The valve body 6 a of the water valve member 6 is seated on the valve seat portion 10, and is in a state where the valve body 6 a is closed, that is, water is not allowed to flow into the main body 2. On the other hand, the foam extinguishing agent valve 16 in the foam extinguishing agent valve member 7 connected to the water valve member 6 by the shaft 8 is in a position where the slit 16b is not in the cylinder 15, and the foam extinguishing agent valve 16 and the foam extinguishing agent are in the cylinder 15. The closed state where the inside of the medicine valve 16 is not communicated, that is, the state where the foam fire-extinguishing medicine is not allowed to flow into the main body 2 is established.

  When a fire occurs, when a pump of water supply means (not shown) is activated and water flows into the main body 2 from the water inlet 3, the pressure of the water is received by the valve body 6 a of the water valve member 6, and the coil spring 11 is attached. When the valve body 6a moves in the A1 direction against the force and moves away from the valve seat portion 10, water flows into the main body 2. At this time, the bubble extinguishing agent valve 16 of the foam extinguishing agent valve member 7 connected to the valve element 6a of the water valve member 6 via the shaft 8 or the like moves the valve element 6a of the water valve member 6. As shown in FIG. 2 (a), the slit 16 b moves to a position facing the cylinder 15, and a slit is formed between the foam extinguishing agent valve 16 and the cylinder 15. When the gap S is formed by 16b, the foam extinguishing agent in the cylinder 15 flows into the foam extinguishing agent valve 16 through the slit 16b, and the foam extinguishing agent opens the foam extinguishing agent valve 16. It flows into the support member 17 from the end 16e, and flows out into the main body 2 from the outlets 17a, 17b. Thereafter, in the main body 2, it is mixed with water to become a foam aqueous solution, and flows out from the foam aqueous solution outlet 5. Then, the amount of the foam aqueous solution flowing out from the foam aqueous solution outlet 5 changes, the amount of water flowing into the main body 2 from the water inlet 3 changes, and the proportional valve member 9 moves in the A1 direction or the A2 direction. Even in this case, the proportional valve member 9 is configured so that the foam-extinguishing chemical valve 16 in the foam-extinguishing chemical valve member 7 matches the change in the flow area between the valve body 6a and the valve seat 10 in the water-valve member 6. The flow area between the cylinder 15 formed by the slit 16b, that is, the area of the gap S can be changed.

  As described above, the gap S can be formed by concentrating the gap serving as the communication portion between the inside of the cylinder 15 and the foam extinguishing agent valve 16 in a substantially rectangular shape in a narrow range. Even when the area of S is small and the foam extinguishing agent has a high kinematic viscosity, the gap size of the gap S can be prevented from becoming so narrow that the foam extinguishing agent becomes difficult to pass through. It is possible to ensure a gap size through which the chemical can pass sufficiently, and to pass a predetermined amount of foam fire-extinguishing chemical.

  Therefore, according to the mixer 1, a stable mixing ratio can be obtained even if the environmental temperature changes or a foaming agent having a high kinematic viscosity is used.

  When the fire is large and water flows at a large flow rate, the end of the spring guide 12 on the shaft 8 side comes into contact with the end of the support member 17. The height of the spring guide 12 is designed so that the maximum flow rate of the mixer is when the two hit. That is, the distance between the end of the spring guide 12 on the shaft 8 side and the end of the support member 17 is larger than the distance between the tip of the shaft 8 (tip wall 16c of the foam drug valve) and the inner wall surface of the bottom of the cylinder. It is designed to be shorter.

  This is because the distance between the end of the spring guide 12 on the shaft 8 side and the end of the support member 17 is large. In other words, if the height of the spring guide is low, the amount of contraction of the coil spring during water discharge increases. Therefore, by increasing the height of the spring guide to some extent, it is possible to prevent an increase in the load of the coil spring during water discharge.

  The cylinder 15 can be made of one member, but may be made of two members as shown in the sectional view of FIG. In this case, four communication ports are provided, and the main body is open at both ends and a lid that closes the openings at the side ends. The lid is exposed to the outside and screwed in. Since it is necessary, it is better to make it from metal from the viewpoint of strength, and it is desirable that the main body is made of non-metal such as resin in consideration of corrosion by the foam stock solution.

It is a longitudinal cross-sectional view of the mixer of this invention. It is a figure which shows the cylinder and bubble extinguishing chemical | medical agent valve | bulb part of a mixer same as the above, (a) is sectional drawing, (b) is a perspective view. It is a front view of a cylinder part same as the above. It is a front view of the cylinder part in the state which mounted | wore the filter same as the above. It is a figure which shows the valve | bulb part for bubble extinguishing chemicals same as the above, (a) is AA sectional view taken on the line of (b), (b) is a top view. It is a figure which shows the cylinder and valve | bulb part of the conventional mixer, (a) is a perspective view, (b) is sectional drawing containing the clearance gap part formed between both.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mixer 2 Main body 3 Water inlet 4 Foam extinguishing chemical inlet 5 Foam aqueous solution outlet 6 Water valve member 6a Valve body 7 Foam extinguishing chemical valve member 8 Shaft 9 Proportional valve member 10 Valve seat part 11 Coil spring 12 Spring guide 13 Communication Port 14 End Wall 14a Open 15 Cylinder 16 Foam Extinguishing Agent Valve 16a Side 16b Slit 16c Tip Wall 16d Slit 16e Open End 17 Supporting Member 17a Outlet 17b Outlet

Claims (3)

The foam fire-extinguishing agent flowing in from the foam fire-extinguishing agent inlet and the water flowing in from the water in-flow port are mixed to produce a foam aqueous solution, the foam aqueous solution is allowed to flow out from the foam aqueous solution outlet, and the amount of the water flowing in A foam extinguishing equipment mixer that adjusts the amount of the foam extinguishing agent flowing in,
Provided between the foam extinguishing agent inlet and the water inlet, provided with a shaft provided with a valve member at the end in contact with each inlet,
A valve member for the foam fire-extinguishing agent on the shaft, a cylinder having a communication port and an opening communicating with the foam-extinguishing agent inflow port, a sliding inside the opening of the cylinder, and a front end side facing the cylinder being closed; Consists of a cylindrical foam extinguishing agent valve with a rear end opened and a slit extending in the length direction on the side .
A mixer for foam fire extinguishing equipment, characterized in that the slit is a stepped slit that changes stepwise so that the width in the circumferential direction gradually widens in the length direction toward the rear end .   The mixer of a foam extinguishing equipment according to claim 1, wherein the slit is formed in a direction deflected with respect to a thickness direction of a side portion of the foam extinguishing chemical valve. A support member for supporting a biasing member that normally biases the water valve member of the shaft in a closing direction, the support member housing the foam extinguishing agent valve therein and having an outlet for the foam extinguishing agent With
The outlet of the foam fire-extinguishing agent is provided at a position facing the slit, and the valve for the foam fire-extinguishing agent is further formed with another slit at a position facing the slit. The mixer of the foam fire-extinguishing equipment according to claim 1 or 2.

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