JP2960012B2 - Decompression device for gas fire extinguishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing agent gas storage container, which discharges an inert fire extinguishing agent gas stored in a gaseous state into a fire extinguishing target compartment and extinguishes the concentration of the fire extinguishing agent in the fire extinguishing target compartment. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing device for a gas fire extinguishing system, which is used to extinguish a fire by maintaining the concentration at or higher than the concentration, so as to reduce a high-pressure supply gas pressure to a predetermined outlet gas pressure.

[0002]

2. Description of the Related Art Conventionally, a fire extinguisher has been used as a gas fire extinguishing system in which a fire extinguishing agent is discharged into a fire extinguishing section and the fire extinguishing agent is extinguished by maintaining the concentration of the fire extinguishing agent in the fire extinguishing section higher than the flame-extinguishing concentration. Those using an inert gas such as carbon dioxide or halon gas have been put to practical use.

When an inert gas such as carbon dioxide or halon gas is used as a fire extinguishing agent, these extinguishants are pressurized and liquefied and filled in a fire extinguisher gas storage container composed of a high-pressure gas container to extinguish fire extinguishing equipment. In the event of a fire, use appropriate electrical or pneumatic means to open the container valve of the fire extinguishing agent gas storage container to remove carbon dioxide and halon gas from the fire extinguishing agent gas storage container. From the nozzle to the injection head via a pipe, and discharges from the injection head into the fire extinguishing target compartment. At this time, the inert gas such as carbon dioxide and halon gas is sent in a liquid state to the ejection head, and is vaporized at the moment when the gas is released from the ejection head into the fire extinguishing section, and becomes a gaseous state. To suppress the fire.

A gas fire extinguishing system using an inert gas such as carbon dioxide or halon gas is capable of rapidly suppressing a fire, hardly contaminating a fire extinguishing agent with a fire extinguishing agent, and having an electrical insulating property. That the fire extinguishing agent can penetrate through gaps and exert a strong fire-extinguishing effect even on fire-extinguishing objects with a complicated structure, and that the fire extinguishing agent has a constant fire-extinguishing ability over a long period without aging. It is widely used not only in petroleum-related facilities and electrical facilities, but also in general facilities.

However, in recent years, a problem relating to destruction of the ozone layer has been raised on a worldwide scale, and production of fire extinguishing agents containing halogenated hydrocarbon components such as halon gas was discontinued in January 1994. It is virtually unusable. Accordingly, excluding special fire extinguishing equipment using expensive rare gas such as argon, it can be said that the fire extinguishing agent currently used in gas fire extinguishing equipment is only carbon dioxide.

[0006] On the other hand, fire extinguishing equipment using carbon dioxide as a fire extinguishing agent is also 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%. At this concentration, if there is a person in the fire extinguishing target compartment, the toxicity of carbon dioxide (narcotic ) May cause a situation involving human life. (2) In the event of a fire, carbon dioxide is sent to the injection head in a liquid state, and when it is released from the injection head into the fire extinguishing target compartment, it evaporates to a gaseous state. Saturated vapor pressure of the indoor air decreases due to deprivation of heat of vaporization, moisture in the air condenses, and static electricity is generated. As a result, the interior of the room is in a fog condition, which may hinder the evacuation and rescue of people and fire extinguishing work, and may cause insulation failure or breakdown of electronic devices due to condensation and static electricity, which may cause a serious secondary disaster. is there. (3) Since carbon dioxide has a much higher density than air, the carbon dioxide released into the fire extinguishing compartment stays in the lower part of the fire extinguishing compartment and the fire extinguishing effect is reduced. It is easy to dissipate outside through the lower opening. (4) As the issue of global warming is raised on a global scale, the use of carbon dioxide may be restricted in the future, as with halon gas.

[0007]

By the way, the applicant of the present invention has proposed to solve the above-mentioned many problems of the conventional gas fire extinguishing system by first adding nitrogen gas or nitrogen gas to a gas that does not destroy the ozone layer. Fluoroalkane (perfluorobutane (C4F10)), hydrogenofluoroalkane (trifluoromethane (CHF3), heptafluoropropane (C3HF7) or pentafluoroethane (C2H
F5)) or hydrogenofluorohalogenoalkane (iodotrifluoromethane (CF3I)) (hereinafter referred to as
These are collectively referred to as "fluorine compounds". (Japanese Patent Application Nos. 6-31690 and 6-313690) have proposed a fire extinguishing system using a mixed gas (hereinafter, simply referred to as a "mixed gas") obtained by mixing at least one of the above types in a proportion of 10% by volume or less. No. 7-77374).

However, it has been found that the following problems also occur when nitrogen gas or mixed gas is used as a fire extinguishing agent for gas fire extinguishing equipment. (1) Nitrogen gas or mixed gas as a fire extinguishing agent for gas fire extinguishing equipment is used under pressure and stored in gaseous state. Compared with halon gas, the number of fire extinguisher gas storage containers required for extinguishing a fire extinguishing target compartment of the same volume is several times larger, and a large installation space for fire extinguisher gas storage containers is required. (2) In order to reduce the number of fire extinguishing agent gas storage containers to be installed, it is necessary to increase the filling pressure of inert fire extinguishing agent gas to be filled in the fire extinguishing agent gas storage container. When the pressure is increased, the secondary pressure of the fire extinguishing equipment such as the selection valve, the main pipe, the branch pipe, and the injection head is also subject to the high gas pressure of the inert fire extinguishing agent gas. It is necessary to increase the pressure resistance grade, which significantly increases equipment costs, and is not applicable to existing equipment.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of a gas fire extinguishing system using an inert fire extinguishing gas stored in a gaseous state in a fire extinguishing gas storage container such as a nitrogen gas or a mixed gas as a fire extinguishing agent. The supply-side gas pressure of the gas can be reduced to a predetermined outlet-side gas pressure, thereby, for example, when applied to gas-based fire extinguishing equipment, without increasing the pressure-resistant grade of the secondary equipment of the gas-based fire extinguishing equipment. An object of the present invention is to provide a pressure reducing device for gas fire extinguishing equipment that can increase the filling pressure of an inert fire extinguishing agent gas.

[0010]

In order to achieve the above object, a pressure reducing apparatus according to the present invention discharges an inert fire extinguishing agent gas stored in a gaseous state in a fire extinguishing agent gas storage container into a fire extinguishing target compartment. In a decompression device that also serves as a container valve of a fire extinguisher gas storage container of a gas fire extinguishing system that extinguishes the fire by maintaining the concentration of the fire extinguishing agent in the fire extinguishing compartment equal to or higher than the flame-extinguishing concentration, it is supplied to both pressure receiving surfaces. A flow path valve disposed in a gas flow path configured such that a side gas pressure and an outlet side gas pressure are applied at a predetermined area ratio, a reference gas pressure on one pressure receiving surface, and an outlet gas on the other pressure receiving surface. A piston having an operation rod for operating a flow path valve from the gas outlet side of the gas flow path on the other pressure receiving surface, and a gas storage side of the gas flow path. Directly connected to the container,
A spring for closing the gas flow path when a reference gas pressure is not applied to one of the pressure receiving surfaces of the piston by urging the flow path valve in a direction to close the gas flow path is provided. .

The decompression device for gas fire extinguishing equipment according to the present invention discharges an inert fire extinguishing gas stored in a gaseous state in a fire extinguishing agent gas storage container into a fire extinguishing target compartment, and extinguishes the fire extinguishing agent in the fire extinguishing target compartment. Pressure-receiving surfaces on both sides of a flow path valve provided in the gas flow path of a pressure reducing device that also serves as a container valve of a fire extinguisher gas storage container of a gas fire extinguishing system that extinguishes a fire by maintaining the concentration of the fire extinguishing concentration at or above the quenching concentration By using a configuration in which the supply gas pressure and the outlet gas pressure are applied at predetermined area ratios, a pressure reducing device that reduces the high-pressure supply gas pressure to the predetermined outlet gas pressure is realized with a compact structure. In addition, the value of the outlet side gas pressure can be adjusted in a wide range and with high accuracy by changing the reference gas pressure. For this reason, the gas fire extinguishing equipment to which this pressure reducing device is applied can increase the filling pressure of the inert fire extinguishing agent gas without increasing the pressure resistance grade of the secondary equipment of the fire extinguishing equipment and reduce the supply gas pressure. Even in this case, the amount of the inert fire extinguishing agent gas released can be kept constant.

Further, the reference gas pressure is applied to one pressure receiving surface of the piston by directly connecting the gas supply side of the gas flow path to the gas storage container and biasing the flow path valve in a direction to close the gas flow path. Since a spring that closes the gas flow path is provided when it is not, the pressure reducing device can be used as a container valve.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a pressure reducing device according to the present invention will be described based on a gas fire extinguishing system shown in the drawings.

FIG. 1 shows an example of a gas fire extinguishing system using the pressure reducing device of the present invention. In this example, three fire extinguishing target sections 6
This shows a gas fire extinguishing system in the case of having -1, 6-2, and 6-3. This gas fire extinguishing system uses a nitrogen gas, for example, as an inert fire extinguishing agent gas, pressurizes it and fills a high-pressure gas container (at 35 ° C., 1
It is used as a fire extinguisher gas storage container 1 by storing it in a fire extinguishing system at 80 kgf / cm ² ). In the gas fire extinguishing system of this example, five fire extinguisher gas storage containers 1-1, 1-2,
.. Provided with 1-5, a connecting pipe 3 is connected to each container 1 via a container valve 2, and further the connecting pipe 3 is connected to one collecting pipe 4, and this collecting pipe 4 is Target sections 6-1 and 6
Main pipes 5-1, 5-2, 5-3 extended to 2, 6-3
Connect to Select valves 9-1, 9-2, and 9-3 are provided in the main piping 5-1, 5-2, and 5-3, and the fire extinguishing target section 6--6 is provided.
An inert fire extinguishing agent gas is selectively sent to 1, 6-2 and 6-3. The main pipes 5-1, 5-2 and 5-3 extending to the fire extinguishing sections 6-1, 6-2 and 6-3 are respectively placed in the fire extinguishing sections 6-1, 6-2 and 6-3. Branch pipe 8 arranged
-1, 8-2, 8-3, and the branch pipes 8-1, 8-
Injection heads 7-1, 7-2, 7- in which a plurality of 2,8-3 are arranged at appropriate places in fire extinguishing sections 6-1, 6-2, 6-3.
Connect to 3.

In general, each fire extinguishing section 6-1
Since 6-2 and 6-3 have different volumes, the amount of the inert fire extinguisher gas required to extinguish the fire naturally differs. For this reason, the diameters of the main pipes 5-1, 5-2, 5-3 are made different according to the volumes of the fire extinguishing sections 6-1, 6-2, 6-3. Fire extinguishing area 6
The gas fire extinguishing system is configured so that the number of fire extinguisher gas storage containers 1 corresponding to 1, 6-2 and 6-3 is opened.

Here, the fire extinguisher gas storage container 1 to be opened
The number of fire extinguishing sections 6-1 is 5
-2 is set to three, and the fire extinguishing target section 6-3 is set to one. In the figure, 9-1, 9-2, 9-3 are selection valves, 10-1, 10-2, 10-3 are selection valve opening devices,
11-1, 11-2, 11-3 are starting gas containers,
Reference numerals -1, 12-2, and 12-3 denote solenoids for opening the starting gas container. In the figure, 13-1, 13-2, 1
Reference numeral 3-3 denotes a starting gas pipeline for controlling the opening of the selection valves 9-1, 9-2, 9-3 and the starting gas containers 11-1, 11-2, 11-3. 10-1,
10-2, 10-3, and non-return valves 14-1, 14-2, 14-3, 14-A, 14-B at appropriate places along the way.
Is arranged. In addition, non-return valves 14-1, 14-2, 14-
Passable directions of 3, 14-A and 14-B are indicated by directions of arrows in the figure. The numbers 1, 2, and 3 at the end of these members respectively correspond to the numbers 1, 2, and 3 at the end of the fire extinguishing target section.

In this case, the high pressure supply gas pressure P0 shown in FIG. 2 is reduced to a predetermined outlet gas pressure P2 defined by the reference gas pressure P1 from the constant pressure gas source. The pressure reducing device according to the present invention is used.
The depressurizing device 2 has a supply-side gas pressure P0 from the gas supply side 21a of the gas passage 21 on the pressure-receiving surfaces on both sides, and a gas outlet side 21b from the gas passage 21 (the lower pressure-receiving surface in FIG. A flow path valve 22 disposed in a gas flow path 21 configured such that an outlet side gas pressure P2 is applied at a predetermined area ratio (via an outlet side gas supply flow path 21c);
A spring 23 for urging the flow path valve 22 in the direction to close the valve, and a constant-pressure gas source (in this case, a nitrogen gas is charged as a constant-pressure gas source at 110 ° C at 35 ° C.
m ² ) Startup gas containers 11-1, 11-2, 11-3
I use it. ) To constant pressure gas supply channel 2
4, a reference gas pressure P1 is applied to the other pressure receiving surface from the gas outlet side 21b via the outlet gas supply flow path 21d, and an outlet gas pressure P2 is applied to the other pressure receiving surface. A piston 26 provided with an operation rod 27 for operating the valve 22;
And a spring 28 for biasing the spring 6. In this case,
The decompression device 2 forms a gas supply side main body 20 a that forms a gas supply side 21 a of a gas flow path 21 that is directly connected to the gas storage container 1, and forms a gas outlet side 21 b and a valve seat 29 of the gas flow path 21. It comprises a gas outlet side main body 20b and a constant pressure gas supply flow path side main body 20c constituting a cylinder 25 accommodating the constant pressure gas supply flow path 24 and the piston 26, and these are integrally assembled and configured.

Next, the operation of the pressure reducing device 2 will be described. Starting gas container 11-1, 1 as a constant pressure gas source
By supplying nitrogen gas at a reference gas pressure P1 (110 kgf / cm ² ) from the 1-2 and 11-3 to the constant-pressure gas supply flow path 24, the piston 26 is moved against the urging force of the spring 28, The gas flow path 21 is opened by operating the flow path valve 22 against the urging force of the spring 23 by the operation rod 27 projecting from the pressure receiving surface 26. When the gas flow path 21 is opened, the fire extinguisher gas storage container 1 moves from the gas discharge side 21 to the gas outlet side 21 of the gas flow path 21.
b, the depressurizing device 2 applies the supply-side gas pressure P0 (35 ° C.) of the inert fire-extinguishing gas in the fire-extinguishing-gas storage container 1 to the pressure-receiving surfaces on both sides of the flow path valve 22. At 180 kgf / cm ² ) and the outlet gas pressure P ² ,
A reference gas pressure P1 (110 kgf / cm ^{2 at} 35 ° C.) from the constant pressure gas source is applied to one of the pressure receiving surfaces of the piston 26, and an outlet gas pressure P2 is applied to the other pressure receiving surface at a predetermined area ratio. The following equation (1)
Accordingly, the flow path valve 22 and the piston 26 equilibrate instantaneously, and in this example, as shown in Tables 1 and 2, the outlet gas pressure P2 is set to the starting gas containers 11-1, 11-2, 11
Is held substantially equal to the -3 of the reference gas pressure P1 (110kgf / cm ^2). The outlet gas pressure P2 in Tables 1 and 2
Is a numerical value calculated by Expression (2) derived from Expression (1). (A ² −C ² ) P 0 + (C ² + B ² ) P ² = B ² · P 1 + A ² · P ² (1) P ² = (B ² · P 1 − (A ² −C ² ) P 0) / (C ² + B ² −A ² ) (2) where A is the diameter of the valve seat 29, B is the diameter of the piston 26, and C is the lower pressure receiving the gas pressure P 2 on the outlet side of the flow path valve 22. The diameter of the surface. In this case, the outlet gas pressure P2 held by the pressure reducing device 2 is a constant pressure gas source, that is, the starting gas containers 11-1, 11-2, 1
The reference gas pressure P1 itself of 1-3 is adjusted, or a pressure regulator is provided in the starting gas containers 11-1, 11-2, and 11-3, and the reference gas pressure P1 is adjusted by the pressure regulator. However, due to the design of the inert gas fire extinguishing equipment, the outlet side gas pressure P2 is maintained at a value substantially equal to the reference gas pressure P0. It is desirable to configure so that. The decompression device 2 stops the supply of the nitrogen gas from the constant-pressure gas source, that is, the nitrogen gas from the start-up gas containers 11-1, 11-2, and 11-3. Is discharged, so that the gas flow path 21 can be closed. By using this function, the fire extinguishing agent gas storage container that has been opened can be closed. .

[0019]

[Table 1]

[0020]

[Table 2]

The decompression device 2 is shown in Tables 1 and 2
As shown in FIG. 2, the outlet gas pressure P2 is maintained at the reference gas pressure until the pressure of the inert fire-extinguishing gas in the fire-extinguishing gas storage container 1, that is, the supply gas pressure P0 falls 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 inert fire-extinguishing gas in the fire-extinguishing gas storage container is reduced by the release of the inert fire-extinguishing gas, the outlet-side gas pressure P2 is reduced. By maintaining the gas pressure at a value substantially equal to the reference gas pressure P1, the discharge amount of the inert fire extinguishing agent gas can be kept constant.

Next, the operation of the gas fire extinguishing system using the pressure reducing 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 a fire discoverer operates the push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-1, an electric signal is output to open the starting gas container. Is sent to the solenoid 12-1, and the solenoid 12-1 operates to open the starting gas container 11-1. The start-up gas released by opening the start-up gas container 11-1 is first supplied to the selection valve opening device 1.
After being introduced at 0-1 and opening the selection valve 9-1, it passes through the nonreturn valve 14-1 and the starting gas line 13-1, passes through the nonreturn valve 14-A and the nonreturn valve 14-B. To reach all the container valves 2 to open all five fire extinguishing agent gas 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 allowed.
Is not released. By the way, since the container valve 2 uses a pressure reducing device that can reduce the high-pressure 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, The reference gas pressure P1 (110 kgf / c) is supplied from the five opened fire extinguishing agent gas storage containers 1.
m ² ) The inert gas regulated below is supplied to the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-1, the main pipe 5-1, and the branch pipe 8.
-1, and is discharged to the fire extinguishing section 6-1 from the jet head 7-1.

If a fire occurs in the fire extinguishing target section 6-2, when a fire discoverer operates a push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-2, an electric signal for starting is generated. It is sent to the solenoid 12-2 for opening the gas container, and the solenoid 12-2 operates to operate the gas container 11 for starting.
-2 is released. The starting gas released by opening the starting gas container 11-2 is first introduced into the selection valve opening device 10-2 to open the selection valve 9-2, and then the non-return valve 14- 2, only three fire extinguisher gas storage containers 1 pass through the starting gas pipeline 13-2, pass through the non-return valve 14-B, reach the container valve 2, ie, the fire extinguisher gas storage containers 1-3. , 1-4 and 1-5 are released. At this time, since it cannot pass through the non-return valve 14-A, two of the extinguishing agent gas storage containers 1, that is, the extinguishing agent gas storage containers 1-1 and 1-2 are not opened. In addition, non-return valve 14-
1 and cannot pass through 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 has a pressure reducing device that can reduce the high-pressure supply-side gas pressure P0 to a predetermined outlet-side gas pressure P2 defined by a reference gas pressure P1 from a constant-pressure gas source. , The reference gas pressure P1 (1) is supplied from the three opened fire extinguisher gas storage containers 1-3, 1-4, 1-5.
Inert gas regulated to 10 kgf / cm ² or less is supplied to the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-2, and the main pipe 5-2.
And to the ejection head 7-2 via the branch pipe 8-2,
It is discharged from the ejection head 7-2 into the fire extinguishing target section 6-2.

If a fire occurs in the fire extinguishing target section 6-3, when a fire discoverer operates a push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-3, an electric signal is generated for activation. It is sent to the solenoid 12-3 for opening the gas container, and the solenoid 12-3 operates to operate the gas container 11 for starting.
-3 is released. 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- After passing through 3 and passing through the starting gas line 13-3 and reaching the container valve 2, only one extinguishing agent gas storage container 1 is opened, that is, the extinguishing agent gas storage container 1-5 is opened.
At this time, since the gas cannot pass through the non-return valve 14-B (and, of course, cannot also pass through the non-return valve 14-A), four of the fire-extinguishing agent gas storage containers 1, Gas storage containers 1-1, 1-2, 1-3,
1-4 are not released. Further, since the gas 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 has a pressure reducing device that can reduce the high-pressure supply-side gas pressure P0 to a predetermined outlet-side gas pressure P2 defined by a reference gas pressure P1 from a constant-pressure gas source. , One open fire extinguisher gas storage container 1
An inert gas regulated to a reference gas pressure P1 (110 kgf / cm ² ) or lower from −5 is supplied to the container valve 2, the connecting pipe 3, the collecting pipe 4,
It is sent to the injection head 7-3 via the selection valve 9-3, the main pipe 5-3, and the branch pipe 8-3, and is discharged from the injection head 7-3 into the fire extinguishing target section 6-3.

In the above, the case where the number of fire extinguisher compartments is three and the number of fire extinguisher gas storage containers 1 is five has been described as an example. The number of fire extinguishing agent gas storage containers 1 to be performed is the same as in the present embodiment (the same is applied to the second embodiment and the third embodiment described below).
The present invention is not limited to this, and can be set arbitrarily as needed.

The pressure reducing device 2 of the present invention is arranged such that the supply gas pressure P0 and the outlet gas pressure P2 are applied to the pressure receiving surfaces on both sides of the flow path valve 22 provided in the gas flow path 21 at a predetermined area ratio. By configuring, the pressure reducing device can have a compact structure, and the value of the outlet side gas pressure P2 can be changed in a wide range by changing the reference gas pressure P1, and
It can be adjusted with high precision (for example, see Tables 3 and 4
By changing the reference gas pressure P1, as shown in
The outlet side gas pressure P2 can be kept at an extremely small value as compared with the supply side gas pressure P0. The outlet gas pressure P2 in Tables 3 and 4 is a numerical value calculated by the equation (2) derived from the equation (1). Therefore, the applicable object is not limited to the above-mentioned gas fire extinguishing equipment, but is, for example, a very wide range of constant pressure gas supply equipment for supplying various gases at a constant pressure into equipment such as a nuclear power plant or a semiconductor manufacturing plant. It can be applied to

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

The pressure reducing device for gas fire extinguishing equipment of the present invention
In order to extinguish the fire by releasing the inert fire extinguishing gas stored in gaseous state in the fire extinguishing gas storage container into the fire extinguishing target compartment and maintaining the concentration of the extinguishing agent in the fire extinguishing target compartment equal to or higher than the flame-extinguishing concentration. The supply-side gas pressure and the outlet-side gas pressure have predetermined areas on the pressure-receiving surfaces on both sides of the flow path valve provided in the gas flow path of the pressure reducing device that also serves as the container valve of the fire extinguishing agent gas storage container of the gas fire extinguishing equipment. With such a configuration, a pressure reducing device that reduces the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure can be realized with a compact structure, and the value of the outlet-side gas pressure is used as a reference. By changing the gas pressure, it can be adjusted over a wide range and with high accuracy. For this reason, gas-based fire extinguishing equipment to which this decompression device is applied can increase the filling pressure of the inert fire extinguishing gas without increasing the pressure resistance grade of the secondary equipment of the fire extinguishing equipment, and install a fire extinguishing gas storage container The space can be reduced, and it is not necessary to increase the pressure-resistant grade of the secondary equipment of the fire extinguishing equipment, so that the equipment cost can be reduced and the pressure resistance of the secondary equipment of the fire extinguishing equipment can be reduced. Since there is no need to upgrade the grade, the inert fire extinguishing agent gas stored in the gaseous state in the fire extinguishing agent gas storage container can be applied to existing equipment as it is. The decompression device also controls the pressure of the inert fire extinguishing agent gas in the fire extinguishing agent gas storage container,
That is, until the supply gas pressure falls below the reference gas pressure, the outlet gas pressure is maintained at a value substantially equal to the reference gas pressure. Even if the pressure of the inert fire extinguishing agent gas in the chemical gas storage container drops, the discharge amount of the inert fire extinguishing gas should be kept constant by maintaining the outlet gas pressure at a value approximately equal to the reference gas pressure. Therefore, the capacity of the fire extinguishing equipment can be effectively used, and the equipment cost can be reduced. Furthermore, when the reference gas pressure is not applied to one pressure receiving surface of the piston by directly connecting the gas supply side of the gas flow path to the gas storage container and urging the flow path valve in a direction to close the gas flow path. The pressure reducing device can be used as a container valve because a spring for closing the gas flow path is disposed in the container.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a gas fire extinguishing system.

2A and 2B show a decompression device according to the present invention, wherein FIG. 2A is an overall sectional view and FIG. 2B is an end view taken along line II.

FIG. 3 is a view showing a modification of the gas fire extinguishing equipment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fire extinguisher gas storage container 2 container valve (pressure reducing device) 21 gas flow path 22 flow path valve 23 spring 24 constant pressure gas supply flow path 25 cylinder 26 piston 27 operating rod 28 spring 29 valve seat 6 fire extinguishing target section 7 injection head P0 supply Side gas pressure P1 Reference gas pressure P2 Outlet side gas pressure

Claims (1)

(57) [Claims] 1. Extinguishing an inert fire extinguishing gas stored in a gaseous state in a fire extinguishing agent gas storage container into a fire extinguishing target compartment, and maintaining the concentration of the fire extinguishing agent in the fire extinguishing target compartment equal to or higher than the flame-extinguishing concentration. In a pressure reducing device that also serves as a container valve of a fire extinguishing agent gas storage container of a gas fire extinguishing system, the supply side gas pressure (P0) and the outlet side gas pressure (P2) are respectively set to predetermined pressure receiving surfaces on both sides. A flow path valve (22) disposed in a gas flow path (21) configured to have an area ratio.
And the outlet gas pressure (P2) is applied to one pressure receiving surface and the outlet gas pressure (P2) is applied to the other pressure receiving surface. A piston (26) provided with an operation rod (27) operated from the gas outlet side (21b) of the passage (21), and the gas supply side (21a) of the gas flow path (21) is connected to the gas storage container (1). ), And the reference gas pressure (P1) is applied to one pressure receiving surface of the piston (26) by biasing the flow path valve (22) in a direction to close the gas flow path (21). A spring (2) that closes the gas flow path (21) when there is no
3) A pressure reducing device for gas fire extinguishing equipment, wherein 3) is provided.