JP2007286944A - Decompression device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decompression device which decreases a difference between an emission-starting pressure and a control pressure (maximum outlet pressure). <P>SOLUTION: The decompression device comprises a flow channel valve 22 arranged in a gas flow channel 21 on whose both pressure-reception faces an inlet-side gas pressure P0 and an outlet-side gas pressure P2 are applied in prescribed area ratio, respectively; and a piston 26 which enables a standard gas pressure P1 to be applied to one pressure-reception face, also enables the outlet-side gas pressure P2 to be applied to the other pressure-reception face, and has a projected operation bar 27, which operates the flow channel valve 22, on the other pressure-reception face. In this case, the flow channel valve 22 is composed of a main valve body 22a and an auxiliary valve body 22b. The auxiliary valve body 22b and the main valve body 22a are operated in this order with the operation bar 27 of the piston 26 to open the flow channel valve 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, the extinguishing agent gas stored in a gas state in the extinguishing agent storage container is discharged into the extinguishing target section, and extinguishing the fire by maintaining the extinguishing agent concentration in the extinguishing target section at or above the extinguishing concentration. The present invention relates to a pressure reducing device used for reducing a high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure in a gas fire extinguishing facility or the like.

  Conventionally, as a gas fire extinguishing equipment that extinguishes fire by releasing a fire extinguisher into the fire extinguishing target area and maintaining the fire extinguishing agent concentration in the fire extinguishing target level above the flame extinguishing concentration, carbon dioxide, halon gas, etc. Those using an inert gas have been put into practical use.

  By the way, when using an inert gas such as carbon dioxide or halon gas as a fire extinguisher, these fire extinguishing agents are liquefied and stored in a fire extinguishing facility in a state of being filled in a fire extinguisher storage container consisting of a high pressure gas container. In the event of a fire, use appropriate electrical or pneumatic means to open the container valve of the fire extinguisher storage container to inject carbon dioxide or halon gas from the fire extinguisher storage container through a pipe. It is sent to the head and discharged from the ejection head into the fire extinguishing target section. At this time, the inert gas such as carbon dioxide and halon gas is sent in a liquid state up to the ejection head and is vaporized into a gas state at the moment when it is discharged from the ejection head into the fire extinguishing target section. To fill the fire and suppress the fire.

  And these gas fire extinguishing equipment using inert gas such as carbon dioxide and halon gas can quickly suppress fire, there is almost no contamination in the fire extinguishing target area by fire extinguishing agents, and electrical insulation is not impaired. In addition, the fire extinguishing agent penetrates through the gap and can exert a strong fire extinguishing effect even for a fire extinguisher whose structure is complex, and there is no secular change of the extinguishing agent and has a constant extinguishing capability over a long period of time. Therefore, it is widely used not only for oil-related facilities and electricity-related facilities but also for general facilities.

  However, in recent years, problems related to the destruction of the ozone layer have been raised on a global scale, and production of fire extinguishing agents containing halogenated hydrocarbon components such as halon gas was discontinued in January 1994, and it was actually used. I can no longer do it. As a result, special fire extinguishing equipment that uses argon and newly developed expensive fluorine-based gas has been developed, but at present, carbon dioxide is still a large extinguisher in gas-based fire extinguishing equipment. in use.

On the other hand, fire extinguishing equipment using carbon dioxide as a fire extinguishing agent is known to have the following problems.
(1) The design concentration of carbon dioxide in the fire extinguishing target compartment at the time of fire extinguishing is about 35%. If there is a person in the fire extinguishing target compartment, the toxicity of carbon dioxide (anesthetic property) ) May cause a situation involving human life.
(2) In the event of a fire, carbon dioxide is sent in a liquid state up to the jet head and is vaporized into a gaseous state at the moment when it is released from the jet head into the fire extinguishing target section. In order to take away the heat of vaporization, the saturated vapor pressure of the indoor air is reduced, moisture in the air is condensed, and static electricity is generated. As a result, the interior of the room is fogged, which may hinder human evacuation and rescue and fire fighting, and may cause serious secondary disasters due to poor insulation or malfunction of electronic equipment due to condensation or static electricity. is there.
(3) Since the density of carbon dioxide is much higher than that of air, the carbon dioxide released in the fire extinguishing target area stays in the lower part of the fire extinguishing target area and reduces the fire extinguishing effect. Easy to dissipate from the lower opening.
(4) Since global warming issues have been raised on a global scale, carbon dioxide may also be restricted in the future, just like halon gas.

By the way, the present applicant has previously proposed a gas fire extinguishing facility in which nitrogen gas or various mixed gases are used as a fire extinguishing agent for the gas fire extinguishing facility (see Patent Document 1). It was found that the fire fighting equipment using various gas mixtures has the following problems.
(1) Nitrogen gas or mixed gas used as a fire extinguisher for gas fire extinguishing equipment is pressurized and stored in a gaseous state. Compared to halon gas, the number of extinguishing agent storage containers required for extinguishing the fire extinguishing target section of the same volume is required several times, and a large installation space for the extinguishing agent storage container is required.
(2) To reduce the number of fire extinguisher storage containers to be installed, it is necessary to increase the filling pressure of the extinguishing agent gas filled in the extinguishing agent storage container. High pressure of fire extinguishing agent gas is also applied to secondary equipment of fire extinguishing equipment such as valves, main pipes, branch pipes, jet heads, etc. Therefore, it is necessary to raise the pressure grade of these secondary equipment, Equipment costs are significantly higher and are not applicable to existing equipment.

  In view of the problems of the gas fire extinguishing equipment that uses fire extinguisher gas that is stored in a gas state in a fire extinguisher storage container such as nitrogen gas or mixed gas as a fire extinguisher. The pressure can be reduced to a predetermined outlet side gas pressure, so that, for example, when applied to a gas fire extinguishing equipment, the extinguishing agent gas can be reduced without increasing the pressure grade of the secondary equipment of the gas fire extinguishing equipment. The decompression device which can raise filling pressure was proposed (refer to patent documents 2).

As shown in FIG. 6, this pressure reducing device has a flow path disposed in a gas flow path 21 configured such that a supply-side gas pressure P0 and an outlet-side gas pressure P2 are applied to the pressure receiving surfaces on both sides at a predetermined area ratio. The valve 22 is configured such that the reference gas pressure P1 is applied to one pressure receiving surface and the outlet side gas pressure P2 is applied to the other pressure receiving surface, and an operation rod 27 for operating the flow path valve 22 to the other pressure receiving surface. It consists of a projecting piston 26 and achieves the intended purpose described above.
In the decompression device, when the gas flow path 21 is opened, the fire extinguishing agent gas flows from the fire extinguisher storage container to the gas outlet side 21b of the gas flow path 21. The supply-side gas pressure P0 (for example, 30 MPa at 35 ° C.) and the outlet-side gas pressure P2 of the extinguishing agent gas in the extinguishing agent storage container 1 and the outlet-side gas pressure P2 are constant on the pressure-receiving surfaces of the piston 26. Since the reference gas pressure P1 (for example, 10 MPa at 35 ° C.) from the gas source is configured such that the outlet side gas pressure P2 is applied to the other pressure receiving surface at a predetermined area ratio, the following formula ( According to 1), the flow path valve 22 and the piston 26 are instantaneously balanced, and the outlet side gas pressure P2 is maintained at a value substantially equal to the reference gas pressure P1 (for example, 10.8 MPa at 35 ° C.).
(A ² −C ² ) P 0 + (C ² + B ² ) P ² = B ² · P 1 + A ² · P ² (1)
P2 = (B ² · P 1 − (A ² −C ² ) P 0) / (C ² + B ² −A ² ) (2)
Here, A is the diameter of the valve seat 29, B is the diameter of the piston 26, and C is the diameter of the lower pressure receiving surface to which the outlet side gas pressure P2 of the flow path valve 22 is applied.

By the way, in this decompression device, when there is no significant difference between the diameter A of the valve seat 29 and the diameter C of the lower pressure receiving surface to which the outlet side gas pressure P2 of the flow path valve 22 is applied, the reference gas pressure P1 and The outlet side gas pressure P2 is an approximate value. However, if the difference between the diameter A and the diameter C is too small due to the structure of the pressure reducing device, there is a risk that the extinguishing agent gas may leak because the surface pressure is not sufficiently applied to the flow path valve when the extinguishing agent gas is filled. Not only does A need to be set larger than diameter C, but there is a design limit in reducing the difference between diameter A and diameter C.
On the other hand, if the difference between diameter A and diameter C is increased, the problem of surface pressure that leads to the leakage of the extinguishing agent gas is solved, but the difference between the discharge start pressure and the control pressure (maximum outlet pressure) is increased, and the maximum discharge flow rate is increased. Since it becomes large, it is necessary to increase the pressure-reducing opening when the extinguishing agent gas is released, and there is a problem that the cost of equipment such as a duct connected to the pressure-reducing opening increases.
Further, when a large pressure reduction ratio, for example, 30 MPa at the supply side gas pressure P0: 35 ° C. and 1 MPa at the outlet side gas pressure P2: 35 ° C. is required, the outlet side gas pressure should be accurately controlled. There was a problem that was difficult.
JP-A-8-141102 JP-A-9-319439

  An object of the present invention is to provide a decompression device that can reduce the difference between the discharge start pressure and the control pressure (maximum outlet pressure) in view of the problems of the conventional decompression device.

  In order to achieve the above object, the pressure reducing device of the present invention is a flow path valve arranged in a gas flow path configured such that supply side gas pressure and outlet side gas pressure are applied to the pressure receiving surfaces on both sides at a predetermined area ratio, respectively. And a piston having a reference gas pressure applied to one pressure receiving surface and an outlet side gas pressure applied to the other pressure receiving surface, and an operating rod for operating a flow valve on the other pressure receiving surface. In the pressure reducing device, the flow path valve is constituted by a main valve body and a sub valve body, and the flow path valve is opened by operating the sub valve body and the main valve body in this order by a piston operating rod. It is characterized by that.

  In this case, the throttle portion can be formed in the gas flow path that applies the supply-side gas pressure to the sub-valve element.

According to the decompression device of the present invention, the flow path valve arranged in the gas flow path configured such that the supply side gas pressure and the outlet side gas pressure are applied to the pressure receiving surfaces on both sides at a predetermined area ratio, respectively, and one pressure receiving pressure In the pressure reducing device comprising a reference gas pressure on the surface and an outlet side gas pressure on the other pressure receiving surface, and a piston provided with a projecting operation rod for operating a flow path valve on the other pressure receiving surface, The flow path valve is composed of a main valve body and a sub valve body, and the flow path valve is opened by operating the sub valve body and the main valve body in this order by the operation rod of the piston. A decompression device that reduces the supply side gas pressure to a predetermined outlet side gas pressure can be realized with a compact structure, and the outlet side gas pressure value can be changed over a wide range by changing the reference gas pressure, and Can be adjusted with high precision, and also release It is possible to reduce the difference Hajime圧 and the control pressure (maximum outlet pressure).
For this reason, when this decompression device is applied to a gas fire extinguishing equipment, it is possible to increase the filling pressure of the extinguishing agent gas without increasing the pressure resistance grade of the secondary equipment of the fire extinguishing equipment, and the supply side gas pressure is reduced. Even if it falls, the amount of fire extinguisher gas released can be kept constant, and since the difference between the discharge start pressure and the control pressure (maximum outlet pressure) is small, the maximum discharge flow rate is reduced and the fire extinguisher gas is released. There is no need to increase the pressure relief opening at the time, and the cost of equipment such as a duct connected to the pressure relief opening can be reduced.

  Further, by forming a constricted portion in the gas flow path that applies the supply-side gas pressure to the sub-valve element, the flow composed of the main valve element and the sub-valve element when the flow path valve is operated by the piston operating rod. The stability of the operation of the road valve can be improved.

  Hereinafter, embodiments of the decompression device of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a gas fire extinguishing facility using the decompression device of the present invention.
This example shows the gas fire extinguishing equipment in the case of having three fire extinguishing target sections 6-1, 6-2, 6-3.
This gas fire extinguishing equipment uses, for example, nitrogen gas as a fire extinguisher gas, and pressurizes and fills it into a high pressure gas container (not particularly limited, for example, at 35 ° C., 30 MPa) It is used as a fire extinguisher storage container 1 by storing in the fire extinguishing equipment.
The gas fire extinguishing equipment of this example includes five fire extinguishing agent storage containers 1-1, 1-2,... 1-5, and each container 1 has a connecting pipe 3 via a container valve 2. In addition, the connecting pipe 3 is connected to one collecting pipe 4, and the collecting pipe 4 is extended to the fire extinguishing target sections 6-1, 6-2, 6-3, main pipes 5-1, 5- 2 and 5-3.
Selection valves 9-1, 9-2, and 9-3 are arranged on the main pipes 5-1, 5-2, and 5-3, and are selected as fire extinguishing target sections 6-1, 6-2, and 6-3 To send fire extinguishing gas.
The main pipes 5-1, 5-2, and 5-3 extended to the fire extinguishing target sections 6-1, 6-2, and 6-3 are respectively placed in the fire extinguishing target sections 6-1, 6-2, and 6-3. Connected to the arranged branch pipes 8-1, 8-2, 8-3, and the branch pipes 8-1, 8-2, 8-3 are placed in the fire extinguishing target sections 6-1, 6-2, 6-3. Are connected to a plurality of jetting heads 7-1, 7-2, and 7-3 disposed at appropriate positions.

By the way, normally, since the volume of each fire extinguishing object section 6-1, 6-2, 6-3 differs, naturally the quantity of fire extinguishing agent gas required for extinguishing fires also differs.
For this reason, the diameters of the main pipes 5-1, 5-2, and 5-3 are changed according to the volumes of the respective fire extinguishing target sections 6-1, 6-2, and 6-3. The gas fire extinguishing equipment is configured so that the number of fire extinguishing agent storage containers 1 corresponding to the fire extinguishing target sections 6-1, 6-2 and 6-3 are opened.

Here, the number of fire extinguishing agent storage containers 1 to be opened is set to 5 for the fire extinguishing target section 6-1, 3 for the fire extinguishing target section 6-2, and 1 for the fire extinguishing target section 6-3. .
In the figure, 9-1, 9-2 and 9-3 are selection valves, 10-1, 10-2 and 10-3 are selection valve opening devices, and 11-1, 11-2 and 11-3 are activated. Gas containers 12-1, 12-2, and 12-3 are solenoids for opening the starting gas container.
In the figure, reference numerals 13-1, 13-2, and 13-3 indicate that the selection valves 9-1, 9-2, and 9-3 and the starting gas containers 11-1, 11-2, and 11-3 are opened. It is connected to the selective valve opening devices 10-1, 10-2, 10-3 by a starting gas pipeline to be controlled, and non-return valves 14-1, 14-2, 14-3, 14- A and 14-B are disposed. In addition, the passable direction of the non-return valves 14-1, 14-2, 14-3, 14-A, 14-B is represented by the direction of the arrow in the figure.
The numbers 1, 2, and 3 at the end of these members correspond to the numbers 1, 2, and 3 at the end of the fire extinguishing target section, respectively.

  In this case, the container valve 2 has a high supply gas pressure P0 as shown in FIG. 2 as a reference gas pressure P1 from a constant pressure gas source (not particularly limited, for example, at 35 ° C., 10 MPa), a decompression device (a first embodiment of the decompression device of the present invention) capable of decompressing to a predetermined outlet side gas pressure P2 is used.

  The decompression device 2 has a predetermined area on each pressure receiving surface from the gas supply side 21a of the gas flow path 21 to the supply side gas pressure P0 and from the gas outlet side 21b of the gas flow path 21 to the outlet side gas pressure P2. A flow path valve 22 arranged in the gas flow path 21 configured to be applied at a rate, and a spring 23 that urges the flow path valve 22 in a direction to close the gas flow path 21 (this spring 23 is a flow path valve 22 Since the main purpose is to stabilize the operation position of the gas, a small biasing force may be used.) And a constant pressure gas source (in this example, nitrogen gas as a constant pressure gas source) on one pressure receiving surface. From a gas container 11-1, 11-2, 11-3 for starting (which is not particularly limited, but is 10 MPa at 35 ° C.), for example. The reference gas pressure P1 is connected to the other side via the path 24. A piston in which the outlet side gas pressure P2 is applied to the pressure surface from the gas outlet side 21b via the outlet side gas supply channel 21d, and an operating rod 27 for operating the channel valve 22 is provided on the other pressure receiving surface. 26 and a spring 28 that urges the piston 26 in a direction opposite to the direction of the flow path valve 22.

  In the decompression device 2, the flow path valve 22 includes a main valve body 22a and a sub-valve body 22b having a smaller diameter than the main valve body 22a disposed in the internal space 22c of the main valve body 22a. The flow valve 22 is opened by operating the auxiliary valve body 22b and the main valve body 22a in this order by the operation rod 27 of 26.

  In this case, the supply-side gas pressure P0 from the gas supply side 21a of the gas flow path 21 through the gas flow path 21c, and the gas outlet side 21b of the gas flow path 21 to the pressure receiving surfaces on both sides of the sub-valve element 22b. The outlet side gas pressure P2 is applied at a predetermined area ratio through the gas flow paths 21d and 21e, and the sub valve body 22b is biased by the spring 23 in the direction of closing the gas flow path 21e. I am doing so.

The gas flow path 21c for applying the supply-side gas pressure P0 to the pressure receiving surface of the sub-valve body 22b is a throttle portion defined by a minute gap between the inner peripheral surface of the main valve body 22a and the outer peripheral surface of the spring support 25. 21f is formed.
The area (cross-sectional area) of the gas flow path of the throttle portion 21f defined by the minute gap is appropriately set according to the size of the decompression device 2, but for example, the inner diameter of the main valve element 22a is 10 mm. in the case of a degree, 0.5 to 3.0 mm ^2, preferably about, so as to set to about 1 to 2 mm ^2.
Further, if necessary, the narrowed portion 21f is provided with a packing 21g (this packing 21g does not have a completely airtight function such as an O-ring but has a self-sealing function, and has a spiral backup ring or tubular shape. It is possible to suitably use a rubber part having a small passage, such as a rubber part.), Thereby improving the dimensional accuracy of the area (cross-sectional area) of the gas flow path of the throttle portion 21f. can do.
As described above, when the flow passage valve 22 is operated by the operation rod 27 of the piston 26 by forming the throttle portion 21f in the gas flow passage 21c for applying the supply side gas pressure P0 to the pressure receiving surface of the sub valve body 22b. The stability of the operation of the flow path valve 22 composed of the main valve body 22a and the sub-valve body 22b can be improved.
The sub-valve body 22b has a flat surface that contacts the valve seat 29b as shown in the present embodiment, as well as a surface that contacts the valve seat 29b as shown in a second embodiment described later. A spherical valve body or a valve body having a check valve structure can be used.

Further, when the flow path valve 22 is opened, the flow valve 22 is opened by operating the sub valve body 22b and the main valve body 22a in this order by the operation rod 27 of the piston 26. A large-diameter portion 27a for operating the main valve body 22a and a small-diameter portion 27b for operating the sub-valve body 22b are formed at the tip thereof.
In this case, the main valve element 22a can be indirectly operated by the sub-valve element 22b operated by the operation rod 27 of the piston 26, and the present invention does not exclude this structure.

Next, the operation of the decompression device 2 will be described.
The reference gas pressure P1 from the starting gas containers 11-1, 11-2, 11-3 as the constant pressure gas source to the constant pressure gas supply flow path 24 (not particularly limited, for example, 10 MPa at 35 ° C.) The nitrogen gas is supplied to move the piston 26 against the biasing force of the spring 28, and the operation valve 27 protruding from the pressure receiving surface of the piston 26 causes the passage valve 22 to resist the biasing force of the spring 23. To open the gas flow path 21.

At this time, in the flow path valve 22 composed of the main valve body 22a and the sub valve body 22b, the sub valve body 22b is first operated by the small diameter portion 27b of the operating rod 27 of the piston 26, and the sub valve body 22b is operated according to the following equation (3). The valve body 22b is opened.
D ² · P0 <B ² · P1 (3)
Here, B is the diameter of the piston 26, and D is the diameter of the valve seat 29b of the auxiliary valve body 22b.

  When the sub-valve element 22b is opened, the internal space 22c of the main valve element 22a is connected to the gas outlet side 21b of the gas flow path 21 via the gas flow paths 21d and 21e, and is thus applied to the main valve element 22a. Since the influence of the internal pressure is almost eliminated from the balance of pressure, the main valve body 22a is opened with a very small force by operating the main valve body 22a by the large-diameter portion 27a of the operating rod 27 of the piston 26. Become.

When the gas flow path 21 is opened, the extinguishing agent gas flows from the fire extinguisher storage container 1 to the gas outlet side 21b of the gas flow path 21, but the decompression device 2 is connected to the pressure receiving surfaces on both sides of the flow path valve 22. The supply-side gas pressure P0 and the outlet-side gas pressure P2 of the extinguishing agent gas in the extinguishing agent storage container 1, the reference gas pressure P1 from the constant pressure gas source on one pressure receiving surface of the piston 26, and the other pressure receiving surface. Since the outlet side gas pressure P2 is configured to be applied at a predetermined area ratio, the flow path valve 22 and the piston 26 are instantaneously balanced according to the following formula (1). The gas pressure P2 is maintained at a value substantially equal to the reference gas pressure P1 of the startup gas containers 11-1, 11-2, 11-3 (for example, 10 MPa at 35 ° C.).
(A ² −C ² ) P 0 + (C ² + B ² ) P ² = B ² · P 1 + A ² · P ² (1)
P2 = (B ² · P 1 − (A ² −C ² ) P 0) / (C ² + B ² −A ² ) (2)
Here, A is the diameter of the valve seat 29a of the main valve body 22a, B is the diameter of the piston 26, and C is the diameter of the lower pressure receiving surface to which the outlet side gas pressure P2 of the flow path valve 22 is applied.

  In this case, the outlet side gas pressure P2 held by the decompression device 2 adjusts the reference gas pressure P1 itself of the constant pressure gas source, that is, the startup gas containers 11-1, 11-2, 11-3, A pressure regulator is arranged in the starting gas container 11-1, 11-2, 11-3, and the reference gas pressure P1 is adjusted by this pressure regulator, or a flow path as shown in a third embodiment to be described later. Although it can be changed by changing the shapes of the valve 22 and the piston 26, etc., the design is such that the outlet side gas pressure P2 is kept substantially equal to the reference gas pressure P0 in the design of the inert gas fire extinguishing equipment. It is desirable to do.

  The decompression device 2 stops the supply of nitrogen gas from the constant pressure gas source, that is, the starting gas containers 11-1, 11-2, 11-3, and nitrogen gas in the constant pressure gas supply flow path 24. It is possible to close the fire-extinguishing agent storage container 1 once opened by using this function. .

  Moreover, this decompression device 2 introduces a fire extinguisher gas in a pressurized state from the gas outlet side 21b of the gas flow path 21, thereby automatically opening the flow path valve 22 and supplying the fire extinguisher gas to the fire extinguisher storage container. 1 can be filled. In this case, by stopping the introduction of the extinguishing agent gas from the gas outlet side 21b of the gas flow path 21 (releasing the pressurization state), the flow path valve 22 automatically closes and extinguishes the filled extinguishing gas. It can be stored in the agent storage container 1.

  And this decompression device 2 uses the outlet side gas pressure P2 as the reference gas pressure until the pressure of the extinguisher gas in the extinguisher storage container 1, that is, the supply side gas pressure P0 drops below the reference gas pressure P1. Since it has a function of maintaining a value substantially equal to P1, even when the pressure of the extinguishing agent gas in the extinguishing agent storage container decreases due to the release of the extinguishing agent gas, the outlet side gas pressure P2 is set to the reference gas pressure P1. By maintaining substantially the same value, the discharge amount of the extinguishing agent gas can be kept constant.

Next, the operation of the gas fire extinguishing equipment using the decompression device 2 as a container valve in the event of a fire will be described.
Now, assuming that a fire has occurred in the fire extinguishing target section 6-1, when the fire finder operates a push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-1, the electrical signal is opened to the start gas container. The solenoid 12-1 is operated and the activation gas container 11-1 is opened.
The start-up gas released by opening the start-up gas container 11-1 is first introduced into the selection valve opening device 10-1 to open the selection valve 9-1, and then the non-return valve 14-. 1 through the starting gas line 13-1, pass through the non-return valve 14-A and the non-return valve 14-B, reach all the container valves 2, and open all five extinguishing agent storage containers 1.
At this time, since it cannot pass through the non-return valve 14-2 and the non-return valve 14-3, the selection valve 9-2 and the selection valve 9-3 are not opened.
By the way, because the container valve 2 uses a pressure reducing device that can reduce the high supply gas pressure P0 to a predetermined outlet gas pressure P2 defined by the reference gas pressure P1 from the constant pressure gas source, The inert gas regulated to the reference gas pressure P1 or less from the five fire extinguishing agent storage containers 1 opened is the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-1, the main pipe 5-1, It is sent to the ejection head 7-1 through the branch pipe 8-1, and discharged from the ejection head 7-1 into the fire extinguishing target section 6-1.

Further, if a fire has occurred in the fire extinguishing target section 6-2, when the fire finder operates a push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-2, an electrical signal is opened to the start gas container. Is sent to the solenoid 12-2 for operation, and the solenoid 12-2 is operated to open the starting gas container 11-2.
The starting gas released by opening the starting gas container 11-2 is first introduced into the selective valve opening device 10-2 to open the selective valve 9-2, and then the non-return valve 14-. 2 passes through the starting gas line 13-2, passes through the non-return valve 14-B, reaches the container valve 2, and has only three extinguishing agent storage containers 1, that is, the extinguishing agent storage containers 1-3, -4, 1-5 are opened.
At this time, since it cannot pass through the non-return valve 14-A, two of the extinguishing agent storage containers 1, that is, the extinguishing agent storage containers 1-1 and 1-2 are not opened.
Moreover, since it cannot pass through the non-return valve 14-1 and the non-return valve 14-3, the selection valve 9-1 and the selection valve 9-3 are not opened.
By the way, the container valve 2 includes a pressure reducing device capable of reducing the high supply side gas pressure P0 to a predetermined outlet side gas pressure P2 defined by the reference gas pressure P1 from the constant pressure gas source. Therefore, the inert gas regulated to the reference gas pressure P1 or less from the three opened extinguishing agent storage containers 1-3, 1-4, and 1-5 is the container valve 2, the connecting pipe 3, It is sent to the ejection head 7-2 through the collecting pipe 4, the selection valve 9-2, the main pipe 5-2, and the branch pipe 8-2, and discharged from the ejection head 7-2 into the fire extinguishing target section 6-2. .

Also, if a fire has occurred in the fire extinguishing target section 6-3, when the fire finder operates a push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-3, the electrical signal is released from the start gas container. Is sent to the solenoid 12-3 for operation, and the solenoid 12-3 operates to open the starting gas container 11-3.
The starting gas released by opening the starting gas container 11-3 is first introduced into the selection valve opening device 10-3 to open the selection valve 9-3, and then the non-return valve 14-. 3, the starting gas pipe 13-3, the container valve 2, and only one extinguishing agent storage container 1, that is, the extinguishing agent storage container 1-5 is opened.
At this time, since the non-return valve 14-B cannot pass through (therefore, the non-return valve 14-A cannot pass through naturally), four of the fire-extinguishing agent storage containers 1, that is, the extinguishing agent storage. The containers 1-1, 1-2, 1-3, and 1-4 are not opened.
Moreover, since it cannot pass through the non-return valve 14-1 and the non-return valve 14-2, the selection valve 9-1 and the selection valve 9-2 are not opened.
By the way, the container valve 2 includes a pressure reducing device capable of reducing the high supply side gas pressure P0 to a predetermined outlet side gas pressure P2 defined by the reference gas pressure P1 from the constant pressure gas source. Therefore, the inert gas regulated to the reference gas pressure P1 or less from the opened one extinguishing agent storage container 1-5 becomes the container valve 2, the connecting pipe 3, the collecting pipe 4, and the selection valve 9-. 3. It is sent to the jet head 7-3 via the main pipe 5-3 and the branch pipe 8-3, and discharged from the jet head 7-3 into the fire extinguishing target section 6-3.

  As described above, the case where the number of fire extinguishing target sections is three and the number of fire extinguishing agent storage containers 1 is five has been described as an example. However, the number of fire extinguishing target sections, the number of fire extinguishing agent storage containers 1, and the extinguishing agent storage opened. The number of containers 1 is not limited to that of the present embodiment, and can be arbitrarily set as necessary.

And the said pressure reduction apparatus 2 can implement | achieve the pressure reduction apparatus which pressure-reduces the high supply side gas pressure P0 to the predetermined | prescribed exit side gas pressure P2 by a compact structure, Moreover, the value of the exit side gas pressure P2 can be set. By changing the reference gas pressure P1, it can be adjusted in a wide range and with high accuracy, and the difference between the discharge start pressure and the control pressure (maximum outlet pressure) can be reduced.
For this reason, when this decompression device 2 is applied to a gas fire extinguishing equipment, the filling pressure of the extinguishing agent gas can be increased without increasing the pressure resistance grade of the secondary equipment of the fire extinguishing equipment, and the supply side gas pressure Even if the pressure drops, the discharge amount of the extinguishing agent gas can be kept constant, and the difference between the discharge start pressure and the control pressure (maximum outlet pressure) is small, so the maximum discharge flow rate becomes small and the extinguishing agent gas There is no need to increase the pressure relief opening at the time of discharge, and the cost of equipment such as a duct connected to the pressure relief opening can be reduced.

Further, in the above gas fire extinguishing equipment, the decompression device according to the present invention is used in place of the conventional container valve. However, the present invention is not limited to this, and as shown in FIG. The pressure reducing device 18 having the same structure and function as those of the pressure reducing device 2 of the first embodiment is disposed at an appropriate position of the collecting pipe 4 connecting the extinguishing agent storage container 1 and the selection valves 9-1, 9-2, 9-3. In addition to the starting gas containers 11-1, 11-2, and 11-3, a constant pressure gas container 19 filled with nitrogen gas may be provided as a constant pressure gas source.
Thus, by providing the pressure reducing device 18 according to the present invention in the collecting pipe 4, a normal container valve can be used for the container valve 2, and the equipment cost can be reduced. In addition, the high pressure of the extinguishing agent gas is applied to the primary side equipment of the extinguishing equipment such as the container valve 2, the connecting pipe 3, and the collecting pipe 4 from the extinguishing agent storage container 1 to the decompression device 18. These primary devices need to be configured to withstand this high gas pressure, but the collecting pipe 4 and the like have a smaller inner diameter than the main pipes 5-1, 5-2, and 5-3. Since the pressure resistance is high and it is not necessary to raise the pressure resistance grade of the primary equipment of the fire extinguishing equipment, the equipment cost can be reduced and it can be applied to existing equipment as it is.

FIG. 4 shows a second embodiment of the decompression device of the present invention.
This decompression device 2 uses a valve body having a spherical surface that contacts the valve seat 29b as the sub-valve element 22b. More specifically, the sub-valve element 22b has a nylon diameter of about several millimeters. A spherical body made of synthetic resin such as 66 is used, and this sub-valve body 22b is biased by a spring 23 in a direction to close the gas flow path 21 via a cylindrical piston 22d (aspect ratio: about 1). I have to.
In addition, since the decompression device 2 is configured to be able to attach and detach components such as the flow path valve 22 by removing the spring support 25 from the decompression device 2 in a state where the decompression device 2 is mounted on the fire extinguisher storage container 1, There is an advantage that maintenance and the like of the apparatus 2 can be easily performed.
In addition, the other structure and effect | action of a present Example are the same as that of the pressure reduction apparatus 2 of the said 1st Example.

FIG. 5 shows a third embodiment of the decompression device of the present invention.
This decompression device 2 uses a valve body having a spherical surface that contacts the valve seat 29b as the sub-valve element 22b. More specifically, the sub-valve element 22b has a nylon diameter of about several millimeters. A spherical body made of synthetic resin such as 66 is used, and this sub-valve body 22 b is biased by a spring 23 in a direction to close the gas flow path 21.
In addition, since the decompression device 2 is configured to be able to attach and detach components such as the flow path valve 22 by removing the spring support 25 from the decompression device 2 in a state where the decompression device 2 is mounted on the fire extinguisher storage container 1, There is an advantage that maintenance and the like of the apparatus 2 can be easily performed.
In addition, the decompression device 2 can change the shape of the piston 26. More specifically, by replacing the piston 26 and the cylinder portion that houses the piston 26, a large decompression (particularly limited) However, for example, it is easy to change between a case where the pressure reduction ratio is 30: 1 (FIG. 5A) and a case where a large pressure reduction is not required (FIGS. 5B and 5C). To be able to do.
In addition, the other structure and effect | action of a present Example are the same as that of the pressure reduction apparatus 2 of the said 1st Example.

  As described above, the decompression device of the present invention has been described based on a plurality of examples.However, the present invention is not limited to the configurations described in the above examples, and the configurations described in the examples are appropriately combined. The configuration can be changed as appropriate without departing from the spirit of the invention, and the target gas for decompression is not limited to nitrogen, but includes a wide range of inert gases such as argon and carbon dioxide, and various industrial gases. Can be used for various gases.

  Since the decompression device of the present invention has a characteristic capable of reducing the difference between the discharge start pressure and the control pressure (maximum outlet pressure), it can be suitably used for gas-based fire extinguishing equipment, For example, it can be used for a wide range of applications such as a constant-pressure gas supply facility that supplies various gases at a constant pressure in facilities such as nuclear power plants and semiconductor manufacturing plants.

It is a figure showing an example of gas fire extinguishing equipment. 1 shows a first embodiment of a pressure reducing device according to the present invention, wherein (a) is a sectional view when a flow path valve is closed, (b) is a sectional view when a sub-valve element is opened, and (c) is a section when a main valve element is opened. FIG. It is a figure which shows the modification of gas type fire extinguishing equipment. 2 shows a second embodiment of the decompression device of the present invention, wherein (a) is a cross-sectional view when the flow path valve is closed, (b) is a cross-sectional view when the sub-valve element is opened, and (c) is a cross-section when the main valve element is opened. FIG. 3 shows a third embodiment of the decompression device of the present invention, wherein (a) is a plan sectional view of a decompression device that requires a large decompression, (b) is a plan sectional view of a decompression device that does not require a large decompression, and (c). It is the same front sectional view. It is sectional drawing which shows the conventional pressure reduction apparatus.

Explanation of symbols

1 Fire extinguisher storage container 2 Container valve (pressure reduction device)
DESCRIPTION OF SYMBOLS 21 Gas flow path 22 Flow path valve 22a Main valve body 22b Subvalve body 23 Spring 24 Constant pressure gas supply flow path 25 Spring support body 26 Piston 27 Operation rod 28 Spring 29a Valve seat 29b Valve seat 6 Fire extinguishing object section 7 Injection head 18 Pressure reduction Equipment P0 Supply side gas pressure P1 Reference gas pressure P2 Outlet side gas pressure

Claims (2)

  A flow path valve (22) disposed in a gas flow path (21) configured such that a supply side gas pressure (P0) and an outlet side gas pressure (P2) are respectively applied to the pressure receiving surfaces on both sides at a predetermined area ratio; An operating rod that is configured so that the reference gas pressure (P1) is applied to one pressure receiving surface and the outlet side gas pressure (P2) is applied to the other pressure receiving surface, and the flow path valve (22) is operated to the other pressure receiving surface. In the decompression device comprising the piston (26) projecting (27), the flow path valve (22) comprises a main valve body (22a) and a sub-valve body (22b), and the piston (26) The pressure reducing device is characterized in that the flow valve (22) is opened by operating the auxiliary valve body (22b) and the main valve body (22a) in this order by the operation rod (27).   The pressure reducing device according to claim 1, wherein a throttle part (21f) is formed in a gas flow path for applying a supply side gas pressure (P0) to the sub-valve element (22b).

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