JP3058841B2 - Decompression device - 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 used for reducing a high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure in a gas-based fire extinguishing system or the like that extinguishes a fire by maintaining the concentration at or above a concentration.

[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 that can increase the filling pressure of an inert fire extinguishing agent gas.

[0010]

In order to achieve the above object, a pressure reducing device according to the present invention comprises a gas flow path configured such that a supply side gas pressure and an outlet side gas pressure are respectively applied to a pressure receiving surface at a predetermined area ratio. And a piston configured such that the reference gas pressure is applied to one pressure-receiving surface and the outlet-side gas pressure is applied to the other pressure-receiving surface, and a connection rod connecting the piston to the flow-path valve. It is characterized by becoming.

The pressure reducing device of the present invention is configured such that the supply side gas pressure and the outlet side gas pressure are applied to the pressure receiving surface of the flow path valve disposed in the gas flow path at a predetermined area ratio, respectively. A pressure reducing device that reduces the supply gas pressure to a predetermined outlet gas pressure can be realized with a compact structure, and the value of the outlet gas pressure can be changed over a wide range by changing the reference gas pressure, and It can be adjusted with high precision. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the filling pressure of the inert fire 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 Even when the gas pressure decreases, the amount of the inert fire extinguisher gas released can be kept constant. In addition, by connecting the flow path valve and the piston with a connecting rod, the response performance of the pressure reducing device can be improved, and one spring for biasing the flow path valve in the closing direction and one spring for biasing the piston are provided. Spring can be shared,
The structure of the decompression device can be simplified.

In this case, the gas pressure on the supply side and the gas pressure on the outlet side can be respectively applied to the pressure receiving surfaces on both sides of the flow path valve at a predetermined area ratio.
The shape of the pressure reducing device including the piston can be miniaturized.

In addition, the diameter of the valve seat of the flow path valve and the diameter of the pressure receiving surface of the flow path valve on which the gas pressure on the outlet side is applied are substantially equal to each other. And the value of the outlet gas pressure can be easily adjusted.

In addition, the gas supply side of the gas flow path is configured to be directly connected to the gas storage container, whereby the pressure reducing device can be used as a container valve.

[0015]

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 target 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 fire extinguishing agent gas storage containers 1-1, 1-2,... 1-5. Selection valve opening device 10-
1, 10-2, 10-3, and non-return valves 14-1, 14-2, 14-3, 14-A, 14
-B is provided. In addition, the non-return valve 14-1, 14-2, 1
The passing directions of 4-3, 14-A, and 14-B are indicated by the directions of arrows in the figure. The numbers 1, 2, and 3 at the end of these members are the numbers 1, 2, and 3 at the end of the fire extinguishing section.
Respectively.

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), and a constant pressure gas source on one pressure receiving surface. (In the case of this example, the starting gas containers 11-1, 11-2, and 11-3 filled with nitrogen gas (110 kgf / cm ^{2 at} 35 ° C.) are used as the constant-pressure gas source. ) Through the constant-pressure gas supply channel 24 to the reference gas pressure P1, and the other pressure-receiving surface from the gas outlet side 21b to the outlet-side gas pressure P2 via the outlet-side gas supply channel 21d.
And a piston 26 configured to
The connecting rod 27 that connects the flow path valve 22 and the piston 26 by projecting from the other pressure receiving surface and screwing with the flow path valve 22.
And a spring 28 that urges the piston 26 in a direction opposite to the opening direction of the flow path valve 22 to urge the flow path valve 22 in a direction to close the gas flow path 21. The pressure reducing device 2 is directly connected to the gas supply side main body 20 a constituting the gas supply side 21 a of the gas flow path 21 and the gas storage container 1, and the gas outlet side 21 b of the gas flow path 21, the valve seat 23 and It comprises a gas outlet side main body 20b constituting the cylinder 25 accommodating the piston 26, and a constant pressure gas supply flow path side main body 20c constituting the constant pressure gas supply flow path 24, and these are integrally assembled and constituted. .

In this case, if the connecting rod 27 connects the flow path valve 22 and the piston 26, the connection rod 27
2 and may be configured separately from the flow path valve 22 and the piston 26. Further, instead of the spring 28 for urging the piston 26 in the direction opposite to the opening direction of the flow path valve 22, a spring for urging the flow path valve 22 in a direction for directly closing the gas flow path 21 is provided. Can also.

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 flow path valve 22 is operated against the urging force of the spring 28 by the connecting rod 27 protruding from the pressure receiving surface 26 to open the gas flow path 21. 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. Therefore, according to the following equations (1) and (2), the flow path valve 22 and the piston 26
Is instantaneously equilibrated, and the outlet gas pressure P2 is equal to the reference gas pressure P1 (11) of the starting gas containers 11-1, 11-2, and 11-3.
0 kgf / cm ² ).

(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 23, B is the diameter of the piston 26, and C is the gas pressure P 2 on the outlet side of the flow path valve 22 in FIG. The diameter of the lower pressure receiving surface.

In this case, the valve seat 23 of the flow path valve 22
The diameter A of the pressure and the diameter C of the pressure receiving surface on which the outlet gas pressure P2 of the flow path valve 22 is applied are made substantially equal (A ≒ C), so that the value of the outlet gas pressure P2 is reduced. 11-
1, 11-2, 11-3 reference gas pressure P1 (110 kgf /
cm ²⁾ values substantially coincide (P2 ≒ P1) that can be in the, and that the adjustment of the value of the outlet side gas pressure P2 can be easily performed.

The outlet gas pressure P2 held by the pressure reducing device 2 adjusts the reference gas pressure P1 itself of the constant-pressure gas source, that is, the starting gas containers 11-1, 11-2, and 11-3. , Starting gas containers 11-1, 11-2, 1
1-3, a pressure regulator is provided to adjust the reference gas pressure P1 or to adjust the flow rate valve 22 and the piston 2
However, due to the design of the inert gas fire extinguishing equipment, the outlet side gas pressure P2 can be changed.
Is preferably maintained at a value substantially equal to the reference gas pressure P1. The decompression device 2 includes a constant-pressure gas source, that is, a starting gas container 11-1, 11-2,
This has a function of closing the gas flow path 21 by stopping the supply of the nitrogen gas from 11-3 and discharging the nitrogen gas in the constant-pressure gas supply flow path 24. It is also possible to utilize the configuration to close the fire extinguisher gas storage container once opened.

The pressure reducing device 2 operates until the pressure of the inert fire extinguishing agent gas in the fire extinguishing agent gas storage container 1, that is, the supply gas pressure P0 drops below the reference gas pressure P1.
Since it has a function of maintaining the outlet side gas pressure P2 at a value substantially equal to the reference gas pressure P1, 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. Even in this case, by maintaining the outlet side gas pressure P2 at a value substantially equal to the reference gas pressure P1, the amount of the inert fire extinguishing agent gas released 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 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, From the five opened fire extinguishing agent gas storage containers 1, the reference gas pressure P1 (110 kgf /
cm ² ) The inert gas regulated below is sprayed through 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 from the ejection head 7-1 into the fire extinguishing section 6-1.

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 is generated for activation. 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.

Further, 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 extinguishing target compartments is three and the number of fire extinguishing agent gas storage containers 1 is five has been described as an example. The number of fire extinguisher gas storage containers 1 to be performed is not limited to that of the present embodiment (the same applies to the following example), and can be set arbitrarily as needed.

In the above gas fire extinguishing system,
Although the decompression device according to the present invention is used in place of the conventional container valve, the present invention is not limited to this, and as shown in FIG. -1, 9-2, 9-3, a pressure reducing device 18 is disposed at an appropriate position of the collecting pipe 4, and a constant pressure is provided separately from the starting gas containers 11-1, 11-2, 11-3. Filled with nitrogen gas as a gas source (110 kgf at 35 ° C)
/ Cm ² ) may be provided.
As described above, by providing the pressure reducing device 18 according to the present invention in the collecting pipe 4, a normal container valve can be used as the container valve 2, and the equipment cost can be reduced. In addition, a high gas pressure of the inert fire extinguishing gas is applied to primary equipment of the fire extinguishing equipment such as the container valve 2, the connecting pipe 3 and the collecting pipe 4 from the fire extinguishing gas storage vessel 1 to the pressure reducing device 18. Therefore, these primary devices need to be configured to withstand this high gas pressure, but the collecting pipe 4 and the like have an inner diameter of the pipe that is smaller than that of the main pipes 5-1, 5-2, and 5-3. Since it is small, it has a high withstand pressure. Therefore, it is not necessary to increase the withstand pressure grade of the primary equipment of the fire extinguishing equipment, so that the equipment cost can be reduced and the existing equipment can be applied as it is.

Next, FIG. 4 shows a simplified type pressure reducing device 2A of the pressure reducing device 2 shown in FIG. This depressurizing device 2A also has a high-pressure supply-side gas pressure P0 similarly to the depressurizing device 2 shown in FIG.
Can be reduced to a predetermined outlet gas pressure P2 defined by a reference gas pressure P1 from a constant pressure gas source, and can be used similarly to the pressure reducing device 2 shown in FIG.

The pressure reducing device 2A has a pressure receiving surface on both sides, which is provided on the gas supply side 21a of the gas flow path 21 by the supply side gas pressure P0.
However, the gas outlet 21b of the gas passage 21 has an outlet side gas pressure P2 applied to the gas passage 21 at a predetermined area ratio. The reference gas pressure P1 is applied from the constant pressure gas source via the constant pressure gas supply passage 24, and the outlet gas pressure P2 is applied to the other pressure receiving surface from the gas outlet 21b via the outlet gas supply passage 21d. A piston 26 and a connecting rod 27 projecting from the other pressure receiving surface of the piston 26 and screwing with the flow path valve 22 to connect the flow path valve 22 and the piston 26.
And a spring 28 that urges the piston 26 in a direction opposite to the opening direction of the flow path valve 22 to urge the flow path valve 22 in a direction to close the gas flow path 21. The decompression device 2A is directly connected to the gas storage container 1 and has a gas outlet side 21b of the gas flow path 21, a gas outlet side main body 20b constituting a cylinder 25 accommodating the valve seat 23 and the piston 26.
And a constant-pressure gas supply channel side main body 20c that constitutes the constant-pressure gas supply channel 24. These are integrally assembled and configured.

In this case, if the connecting rod 27 connects the flow path valve 22 and the piston 26, the connection rod 27
2 and may be configured separately from the flow path valve 22 and the piston 26.

Next, the operation of the pressure reducing device 2A will be described. By supplying nitrogen gas having a reference gas pressure P1 (110 kgf / cm ² ) from the constant pressure gas source to the constant pressure gas supply passage 24, the piston 26 is moved against the urging force of the spring 28, and the pressure receiving surface of the piston 26 is moved. The gas flow path 21 is opened by operating the flow path valve 22 against the urging force of the spring 28 by the connecting rod 27 protruding from the gas flow path 21. When the gas flow path 21 is opened,
Extinguishing agent gas storage container 1 to gas outlet side 2 of gas flow path 21
1b is supplied with an inert fire extinguishing agent gas.
The supply pressure P0 (180 kgf / cm ^{2 at} 35 ° C.) and the outlet gas pressure P2 of the inert fire extinguishing gas in the fire extinguishing gas storage container 1 A reference gas pressure P1 (110 kgf / cm ^{2 at} 35 ° C.) from a constant pressure gas source is applied to one pressure receiving surface of the piston 26.
Since the outlet side gas pressure P2 is applied to the other pressure receiving surface at a predetermined area ratio, the flow path valve 22 and the piston 26 according to the following equations (3) and (4).
Instantaneously equilibrates, and the outlet gas pressure P2 becomes equal to the reference gas pressure P1.
(110 kgf / cm ² ).

A ² · P 0 + B ² · P ² = B ² · P 1 + A ² · P ² (3) P ² = (B ² · P 1 -A ² · P 0) / (B ² -A ² ) (4) Here, A is the diameter of the valve seat 23, and B is the diameter of the piston 26.

The outlet gas pressure P2 held by the pressure reducing device 2A can be adjusted by adjusting the reference gas pressure P1 of the constant pressure gas source itself, or by providing a pressure regulator in the constant pressure gas source. The reference gas pressure P1 can be adjusted or the flow path valve 22 can be adjusted.
And by changing the shape of the piston 26 and the like. The decompression device 2A has a function of stopping the supply of the nitrogen gas from the constant-pressure gas source and discharging the nitrogen gas in the constant-pressure gas supply passage 24, thereby closing the gas passage 21. The fire extinguisher gas storage container, which has been opened once, can be closed using this function.

The decompression device 2A is configured such that, for example, the diameter B of the piston 26 is made much larger than the diameter A of the valve seat 23, so that the pressure of the inert fire extinguishing agent gas in the fire extinguishing agent gas storage container is increased. That is, the supply side gas pressure P0
Has a function of maintaining the outlet gas pressure P2 at a value substantially equal to the reference gas pressure P1 until the gas pressure drops to the reference gas pressure P1 or less. Even when the pressure of the inert fire extinguishing agent gas in the container drops, the discharge amount of the inert fire extinguishing gas can be kept constant by maintaining the outlet side gas pressure P2 at a value substantially equal to the reference gas pressure P1. it can.

Although the example in which the pressure reducing devices 2 and 2A of the present invention are used in the gas fire extinguishing equipment has been described above, the pressure reducing devices 2 and 2A of the present invention By configuring the supply-side gas pressure P0 and the outlet-side gas pressure P2 on the pressure receiving surface at a predetermined area ratio,
The decompression device can have a compact structure,
The value of the outlet gas pressure P2 can be adjusted over a wide range and with high accuracy by changing the reference gas pressure P1 (for example, by changing the reference gas pressure P1, the outlet gas pressure P2 can be adjusted on the supply side). It can be kept at an extremely small value compared to the gas pressure P0.)
The present invention is not limited to the above-mentioned gas fire extinguishing equipment, and can be applied to an extremely 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. is there.

[0039]

According to the pressure reducing device of the present invention, a pressure reducing device for reducing a high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure is provided.
It can be realized by a compact structure, and the value of the outlet side gas pressure can be adjusted over a wide range and with high accuracy by changing the reference gas pressure. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the filling pressure of the inert fire extinguishing agent gas can be increased without increasing the pressure resistance grade of the secondary equipment of the gas fire extinguishing equipment. The installation space for the chemical gas storage container can be reduced, and together with the fact that there is no need to increase the pressure resistance of the secondary equipment of the fire extinguishing equipment, equipment costs can be reduced and the fire extinguishing equipment Since there is no need to increase the pressure resistance grade of the secondary-side equipment, 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. Further, by connecting the flow path valve and the piston with a connecting rod, the response performance of the pressure reducing device can be improved, and one spring for biasing the flow path valve in the closing direction and one spring for biasing the piston are provided. And the structure of the pressure reducing device can be simplified.

Further, the configuration of the pressure reducing device including the piston can be downsized by applying the supply side gas pressure and the outlet side gas pressure to the pressure receiving surfaces on both sides of the flow path valve in a predetermined area ratio. Can be.

Further, by making the diameter of the valve seat of the flow passage valve and the diameter of the pressure receiving surface of the flow passage valve on which the gas pressure on the outlet side is applied substantially equal, the value of the gas pressure on the outlet side can be reduced to the reference gas pressure. It can be made to substantially match the value, and the value of the outlet gas pressure can be easily adjusted.

Further, by configuring the decompression device so that the gas supply side of the gas flow path is directly connected to the gas storage container, it can be used as a container valve.

[Brief description of the drawings]

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

FIG. 2 is an overall sectional view showing a decompression device of the present invention.

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

FIG. 4 is an overall sectional view showing a modified example of the pressure reducing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire extinguishing agent gas storage container 2 Container valve (pressure reducing device) 2A Container valve (pressure reducing device) 21 Gas flow path 22 Flow path valve 23 Valve seat 24 Constant pressure gas supply flow path 25 Cylinder 26 Piston 27 Connecting rod 28 Spring 6 Fire extinguishing section 7 Injection head 18 Pressure reducing device P0 Supply gas pressure P1 Reference gas pressure P2 Outlet gas pressure

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G05D 16/00-16/20

Claims (4)

(57) [Claims] 1. A flow path valve (2) 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 at a predetermined area ratio to a pressure receiving surface.
2), a piston (26) configured to apply a reference gas pressure (P1) to one pressure receiving surface and an outlet gas pressure (P2) to the other pressure receiving surface, and the flow path valve (22) and a piston. And a connecting rod (27) for connecting (26). 2. A gas supply system according to claim 1, wherein 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) at a predetermined area ratio. Item 7. A pressure reducing device according to Item 1. 3. The diameter (A) of the valve seat (23) of the flow path valve (22) and the diameter (C) of the pressure receiving surface of the flow path valve (22) to which the outlet gas pressure (P2) is applied. 3. The pressure reducing device according to claim 2, wherein the pressure reducing device is formed substantially equally. 4. A gas supply side (21) of a gas flow path (21).
4. The pressure reducing device according to claim 1, wherein a) is configured to be directly connected to the gas storage container (1).