JP3058842B2 - 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 method for discharging a fire extinguisher gas stored in a gaseous state in a fire extinguisher gas storage container into a fire extinguishing target compartment, so that the concentration of the fire extinguishing agent in the fire extinguishing target compartment is equal to or higher than the flame-extinguishing concentration. TECHNICAL FIELD 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 system or the like which extinguishes a fire by maintaining the pressure at a predetermined value.

[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 extinguisher gas storage containers to be installed, it is necessary to increase the filling pressure of the fire extinguisher gas to be filled in the fire extinguisher gas storage container. High pressure of fire extinguisher gas is also applied to secondary equipment of fire extinguishing equipment, such as selection valves, main piping, branch pipes, injection heads, etc., so it is necessary to increase the pressure resistance grade of these secondary equipment. Yes, equipment costs are significantly higher,
Not applicable to existing equipment.

SUMMARY OF THE INVENTION The present invention has been made in view of the problem of gas fire extinguishing equipment that uses a fire extinguishing agent gas stored in a gaseous extinguishing gas storage container such as a nitrogen gas or a mixed gas as a fire extinguishing agent. Side gas pressure can be reduced to a predetermined outlet side gas pressure, so that, for example, when applied to gas fire extinguishing equipment, the fire extinguishing agent can be increased without increasing the pressure resistance grade of the secondary equipment of the gas fire extinguishing equipment. It is an object of the present invention to provide a decompression device capable of increasing a gas filling pressure.

[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 so that the supply gas pressure and the outlet gas pressure are applied to the pressure receiving surface at a predetermined area ratio, respectively, and the operation of the piston is transmitted to the flow valve, And an operation stick for operating the.

In order to achieve the same object, the pressure reducing device of the present invention is provided in 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. A flow path valve, a piston configured so that an outlet side gas pressure is applied to the pressure receiving surface at a predetermined area ratio, and an operation rod that transmits an operation of the piston to the flow path valve and operates the flow path valve. Features.

This pressure reducing device can realize a pressure reducing device for reducing the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure with a compact structure, and the supply-side gas pressure and the outlet-side gas pressure are applied. By changing the area ratio of the pressure receiving surface of the flow path valve and the piston, the outlet gas pressure with respect to the supply gas pressure can be adjusted in a wide range and with high accuracy. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the filling pressure of the fire extinguishing agent gas can be increased without increasing the pressure resistance grade of the secondary equipment of the fire extinguishing equipment.

In this case, the piston and the flow path valve can be connected by the operation rod.

Thus, the response performance of the pressure reducing device can be improved, and the spring for urging the piston and the spring for urging the flow path valve in the closing direction can be shared by one spring. The structure of the decompression device can be simplified.

Further, by providing a check valve in the gas supply passage for the piston, the supply-side maximum gas pressure or the outlet-side maximum gas pressure can be continuously applied to the pressure receiving surface of the piston.

Thus, even when the supply-side gas pressure decreases, the amount of released gas can be maintained at a high level.
For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the time required for releasing the extinguishing agent gas can be reduced.

The pressure reducing device can be started by opening the sealing plate.

As described above, as a starting means of the decompression device,
2. Description of the Related Art Conventionally, by adopting a sealing plate opening method widely used for gas fire extinguishing equipment, it is possible to operate the pressure reducing device in an emergency without any trouble.

The pressure reducing device can be connected to the gas outlet side of the differential pressure type container valve.

As described above, when connecting the pressure reducing device to the gas storage container, the reliability of the connection portion is improved by adopting the differential pressure type container valve which has been widely used in gas fire extinguishing equipment. The operation of the pressure reducing device and the differential pressure type container valve in an emergency can be performed without any trouble.

The pressure reducing device can be started by applying an open gas pressure.

As described above, as a starting means of the pressure reducing device,
2. Description of the Related Art Conventionally, by adopting an open gas release method widely used in gas fire extinguishing equipment, it becomes possible to operate an evacuation device in an emergency without any trouble.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a pressure reducing device according to the present invention. The pressure reducing device 2 reduces the high-pressure supply gas pressure P0 from the gas storage container 1 to a predetermined outlet gas pressure P2.
The gas supply side 21a is provided on the gas supply side 21a configured such that the gas pressure side P2 from the gas outlet side 21b is applied at a predetermined area ratio. Side gas supply passages 21d, 11 and 21e
Through the supply side gas pressure P0 and the gas outlet side 21
b, a piston 26 configured to apply an outlet gas pressure P2 at a predetermined area ratio through an outlet gas supply passage 21c, and an outlet gas pressure P2 of the piston 26.
The operation rod 27 that protrudes from the pressure receiving surface and is screwed 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 pressure reducing device 2 is directly connected to the gas storage container 1 and has a gas flow path 2.
1 gas supply side 21a, gas outlet side 21b, outlet side gas supply passage 21c, supply side gas supply passage 21d, valve seat 2
3 and a main body 20a constituting a part of a cylinder 25 accommodating the piston 26, a supply gas supply passage 21e of the gas passage 21, an opening 24 and a lid constituting a part of the cylinder 25 accommodating the piston 26. It is composed of a body 20b, which is integrally assembled.

In this case, if the operating rod 27 connects the flow path valve 22 and the piston 26, the operation 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. In addition, the flow path valve 22 and the piston 26 can be configured to be independently operable. In this case, in addition to the spring 28 that biases the piston 26, the flow path A spring for urging the passage valve 22 and the passage valve 22 or the piston 26, and transmitting the operation of the piston 26 to the passage valve 22;
An operation rod for operating the flow path valve 22 is provided.

At the connection between the supply-side gas supply flow path 21d and the supply-side gas supply flow path 11, a sealing plate 35 as a starting means of the decompression device 2 is provided, and an opening is formed in the sealing plate 35. An automatic or manual opening device 3 is connected. The one shown in the figure is a manual opening device 3, which includes an operation unit 31 and an operation unit 3.
1, a piston 32 that slides by operating the piston 1, a blade body 33 formed integrally with the piston 32 to form an opening of a predetermined diameter in the sealing plate 35, and the operating portion 31
, And a safety device 36.

Next, the operation of the pressure reducing device 2 will be described. By operating the opening device 3, an opening is formed in the sealing plate 35. Thereby, from the gas storage container 1, the gas supply side 21a and the supply side gas supply flow paths 21d, 11 and 12,
1e, the supply-side gas pressure P0 is applied to the pressure receiving surface of the piston 26, and the piston 26 is operated against the urging force of the spring 28, so that the operation rod 27 protrudes from the pressure receiving surface of the piston 26. To operate the flow path valve 22 to open the gas flow path 21. When the gas flow path 21 is opened, gas flows into the gas outlet side 21b from the gas storage container 1 via the gas supply side 21a.
The gas pressure P0 (180 kgf / cm ^{2 at} 35 ° C. in the initial state) and the outlet gas pressure P2 of the gas in the gas storage container 1 Since the supply gas pressure P0 of the gas in the storage container 1 (180 kgf / cm ^{2 at an} initial state, at 35 ° C., 180 kgf / cm ² ) and the outlet gas pressure P2 are applied at predetermined area ratios, respectively, According to equations (1) and (2),
The flow path valve 22 and the piston 26 equilibrate instantaneously, and the outlet side gas pressure P2 is defined by the area ratio of the pressure receiving surface of the flow path valve 22 and the piston 26 to which the supply side gas pressure P0 and the outlet side gas pressure P2 are applied. The pressure is reduced to a predetermined value.

[0028] ^{(B2 2 -B1 2) P0 +} (A 2 over ^{C 2) P2 = (B2 2} -C 2) P2 + A 2 · P0 ·· ··· (1) P2 = (B2 2 -B1 2 -A 2 ^{) P0 / (B2 2 -A 2} ) ····· (2) where, a is the diameter of the valve seat 23, B1 is the small-diameter portion which communicates with the opening 24 of the piston 26 diameter, B2 piston 26
Is the diameter of the large diameter portion to which the supply side gas pressure P0 is applied, and C is the diameter of the operation rod 27.

The outlet gas pressure P2 held by the pressure reducing device 2 is changed by changing the area ratio of the pressure receiving surface of the flow passage valve 22 and the piston 26 to which the supply gas pressure P0 and the outlet gas pressure P2 are applied. Can be.

FIG. 2 shows a second embodiment of the pressure reducing device of the present invention. The pressure reducing device 2A is provided with a supply-side gas supply passage 21e for the piston 26 of the pressure reducing device 2 of the first embodiment.
Is provided with a check valve 29 for preventing backflow of gas in the supply-side gas supply flow paths 21d, 11 and 21e, so that even if the pressure of the gas in the gas storage container 1 is reduced due to the release of gas, the piston The supply-side maximum gas pressure P0max (the supply-side gas pressure P0 in the initial state of the gas in the gas storage container 1) is continuously applied to the pressure receiving surface 26. Other configurations are the same as those of the first embodiment. It is the same as the pressure reducing device 2 of the example. The position where the check valve 29 is disposed is not limited to the position of the present embodiment, and may be disposed at any position of the supply-side gas supply flow paths 11, 21d, and 21e.

Next, the operation of the pressure reducing device 2A will be described. By operating the opening device 3, an opening is formed in the sealing plate 35. Thereby, from the gas storage container 1, the gas supply side 21a and the supply side gas supply flow paths 21d, 11,
21e, the supply gas pressure P0 is applied to the pressure receiving surface of the piston 26, and the piston 26 is operated against the urging force of the spring 28, so that the operation rod 27 protrudes from the pressure receiving surface of the piston 26. To operate the flow path valve 22 to open the gas flow path 21. When the gas flow path 21 is opened, gas flows into the gas outlet side 21 b from the gas storage container 1 via the gas supply side 21 a. Gas pressure P0 on the supply side of gas in the storage container 1 (180 kgf / cm ^{2 at} 35 ° C. in the initial state)
And the gas pressure P2 on the outlet side and the maximum gas pressure P0max on the supply side of the gas in the gas storage container 1 on the pressure receiving surface of the piston 26.
(180 kgf / cm ^{2 at} 35 ° C.) and the outlet-side gas pressure P 2 are respectively applied at a predetermined area ratio. Therefore, according to the following equations (3) and (4), the flow path valves 22 and The piston 26 equilibrates instantaneously, and the outlet gas pressure P2 is reduced to a predetermined value defined by the area ratio of the pressure receiving surface of the piston 26 and the flow path valve 22 to which the supply gas pressure P0 and the outlet gas pressure P2 are applied. Is done.

[0032] ^{(B2 2 -B1 2) P0max +} (A 2 over ^{C 2) P2 = (B2 2} -C 2) P2 + A 2 · P0 ····· (1) P2 = (B2 2 -B1 2) P0max- ^{a 2 · P0 / (B2 2} -A 2) ····· (2) where, a is the diameter of the valve seat 23, B1 is the small-diameter portion which communicates with the opening 24 of the piston 26 diameter, B2 piston 26
Is the diameter of the large diameter portion to which the supply side gas pressure P0 is applied, and C is the diameter of the operation rod 27.

According to the pressure reducing device 2A of the present embodiment, as shown in FIG. 3, compared with the pressure reducing device 2 of the first embodiment,
Even when the pressure of the gas in the gas storage container 1, that is, the supply-side gas pressure P0 decreases due to the release of the gas, the release amount of the gas can be maintained at a high level. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the time required for releasing the extinguishing agent gas can be reduced.

Other functions of the pressure reducing device 2A of the present embodiment are the same as those of the pressure reducing device 2 of the first embodiment.

FIG. 4 shows a third embodiment of the pressure reducing device according to the present invention. When connecting the pressure reducing device 2B to the gas storage container 1, the pressure reducing device 2B employs a differential pressure type container valve 4 which has been widely used in gas fire extinguishing equipment. It is intended to improve reliability and the like.

The pressure reducing device 2B has a gas receiving side 21 on the pressure receiving surface.
a, a supply side gas pressure P0 and a gas outlet side 21b from the gas outlet side 21b.
From the gas supply side 21a to the pressure receiving surface, the supply side gas pressure P0 via the supply side gas supply passage 21d, and from the gas outlet side 21b via the outlet side gas supply passage 21c,
The piston 26 is configured such that the outlet side gas pressure P2 is applied at a predetermined area ratio, and the piston 26 is provided with a pressure receiving surface on which the outlet side gas pressure P2 is applied, and is screwed with the flow path valve 22 to flow. An operation rod 27 for connecting the passage valve 22 and the piston 26 and a passage valve 22 in a direction to close the gas passage 21 by urging the piston 26 in a direction opposite to the opening direction of the passage valve 22. And a spring 28. Also,
The decompression device 2B is connected to the differential pressure type container valve 4, and
A gas supply side 21a of the gas flow path 21, a gas outlet side 21b,
Outlet-side gas supply channel 21c and supply-side gas supply channel 21
d, cylinder 2 containing valve seat 23 and piston 26
5 and a lid 20b which forms a part of a cylinder 25 that accommodates the opening 24 and the piston 26. These are integrally assembled.

The differential pressure type valve 4 used to connect the pressure reducing device 2B to the gas storage container 1 is widely used in gas fire extinguishing equipment, and is a valve mounted on the gas storage container 1. The gas supply side 41 of the gas flow path 41 is provided in the box 40.
a, a gas outlet side 41b is formed, a piston 42 functioning as a valve is slidably disposed in the valve box 40, and a spring member 44 for biasing the piston 42 in a closing direction is disposed. Further, an opening at the end of the cylinder 40a into which the piston 42 is inserted is connected to an opening 4 (not shown) of an automatic or manual type via a sealing plate 45.
It is configured to be closed by a cap nut 43 forming 3a.

Next, the operation of the pressure reducing device 2B will be described. By operating the opening device, an opening is formed in the sealing plate 45 of the differential pressure type container valve 4. Accordingly, the pressure of the cylinder 40a in which the piston 42 is inserted is reduced to the atmospheric pressure. Therefore, the piston 42 receives the supply gas pressure P0 from the gas supply side 41a and operates against the urging force of the spring member 44. Therefore, gas is released through the gas flow path 41. Then, the supply gas pressure P0 is supplied via the gas supply side 21a and the supply gas supply passage 21d of the pressure reducing device 2B.
Is applied to the pressure receiving surface of the piston 26, and the piston 26 is operated against the urging force of the spring 28.
Is operated to open the gas flow path 21. Gas flow path 21
Is opened, the gas supply side 21
a, the gas flows into the gas outlet side 21b, and the pressure reducing device 2 supplies the gas supply side gas pressure P0 in the gas storage container 1 to the pressure receiving surface of the flow path valve 22 (initial state, 35 ° C. , 180 kgf / cm ² ) and the outlet gas pressure P ²
On the pressure receiving surface of the piston 26, the gas supply side gas pressure P0 in the gas storage container 1 (180 kgf at 35 ° C. in the initial state)
/ Cm ² ) and the outlet-side gas pressure P2 are respectively applied at a predetermined area ratio. Therefore, according to the equations (1) and (2) of the pressure reducing device 2 of the first embodiment, the flow path valve 22
And the piston 26 equilibrates instantaneously, and the outlet gas pressure P2
Is reduced to a predetermined value defined by the area ratio of the pressure receiving surface of the flow path valve 22 and the piston 26 to which the supply gas pressure P0 and the outlet gas pressure P2 are applied.

Other functions of the pressure reducing device 2B of the present embodiment are the same as those of the pressure reducing device 2 of the first embodiment.

FIG. 5 shows a fourth embodiment of the pressure reducing device according to the present invention. The decompression device 2C is configured to supply gas on the supply side 21e to the piston 26 of the decompression device 2B of the third embodiment.
Instead, a supply-side gas supply flow path 21f penetrating the flow path valve 22, the piston 26, and the operation rod 27 is formed, and a check valve 29 for preventing a backflow of gas in the supply-side gas supply flow path 21f is provided. Accordingly, even when the gas pressure in the gas storage container 1 is reduced due to the release of gas, the supply-side maximum gas pressure P0max is applied to the pressure receiving surface of the piston 26.
(The supply gas pressure P in the initial state of the gas in the gas storage container 1
0) is configured to continue. In this case, the opening 24 formed in the lid 20b of the pressure reducing device 2B of the third embodiment is not formed in the lid 20b that forms a part of the cylinder 25 that houses the piston 26. Further, the gas valve 21 is closed in a direction to close the gas flow channel 21 by urging the piston 26 in a direction opposite to the opening direction of the flow channel valve 22 of the pressure reducing device 2B of the third embodiment.
The spring 28 for biasing 2 need not be provided. Also,
In order to connect the pressure reducing device 2C to the gas storage container 1, a differential pressure type container valve 4, which has been widely used in gas fire extinguishing equipment, is conventionally used via a connecting member 5. The other configuration is the same as that of the pressure reducing device 2B of the third embodiment.

Next, the operation of the pressure reducing device 2C will be described. By operating the opening device, an opening is formed in the sealing plate 45 of the differential pressure type container valve 4. Accordingly, the pressure of the cylinder 40a in which the piston 42 is inserted is reduced to the atmospheric pressure. Therefore, the piston 42 receives the supply gas pressure P0 from the gas supply side 41a and operates against the urging force of the spring member 44. Therefore, gas is released through the gas flow path 41. By the way, when gas flows into the gas supply side 21a of the pressure reducing device 2C via the gas flow path 41 of the differential pressure type valve valve 4 and the gas flow path 51 of the connection member 5, the supply side gas pressure P0
Is applied to the pressure receiving surface of the flow path valve 22, and the flow path valve 22
It operates in a direction to close the gas flow path 21. Thereafter, the supply side gas pressure P0 is applied to the pressure receiving surface of the piston 26 via the gas supply side 21a of the pressure reducing device 2C and the supply side gas supply flow path 21f of the flow path valve 22, and the piston 26 is operated. The gas flow path 21 is opened by operating the flow path valve 22 through the operation rod 27 protruding from the pressure receiving surface of the gas flow path. When the gas flow path 21 is opened, the gas flows from the gas storage container 1 to the gas outlet side 21b via the gas supply side 21a. The supply-side gas pressure P0 of the gas in the storage container 1 (initial state, 180 kgf / cm ^{2 at} 35 ° C.) and the outlet-side gas pressure P2 are also applied to the pressure receiving surface of the piston 26. Since the supply-side maximum gas pressure P0max (180 kgf / cm ^{2 at} 35 ° C.) and the outlet-side gas pressure P2 are respectively applied at a predetermined area ratio, the following formulas (5) and (6) are used. , The flow path valve 22 and the piston 26 are instantaneously balanced, and the outlet side gas pressure P2 is equal to the supply side gas pressure P0 and the outlet side gas pressure P2.
The pressure is reduced to a predetermined value defined by the area ratio of the pressure receiving surface of the piston 26.

[0042] ^{(B1 2 -D 2) P0max +} (A 2 over ^{C 2) P2 = (B2 2} -C 2) P2 + (A 2 -D 2) · P0 ····· (5) P2 = (B1 2 −D ² ) P0max− (A ² −D ² ) · P 0 / (B ^{2 2} −A ² ) (6) where A is the diameter of the valve seat 23, and B 1 is the small diameter portion of the piston 26. The diameter, B2, is the diameter of the large diameter portion of the piston 26 to which the supply gas pressure P0 is applied, C is the diameter of the operation rod 27, and D is the inside diameter of the supply gas supply passage 21f penetrating the operation rod 27.

According to the decompression device 2C of the present embodiment, the pressure of the gas in the gas storage container 1, that is, the supply gas pressure P0 is increased by discharging the gas, as compared with the decompression device 2B of the third embodiment. Even if it decreases, the amount of released gas can be kept at a high level. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the time required for releasing the extinguishing agent gas can be reduced.

Other functions of the pressure reducing device 2C of this embodiment are the same as those of the pressure reducing device 2B of the third embodiment.

FIG. 6 shows a fifth embodiment of the pressure reducing device of the present invention. This depressurizing device 2D employs an open gas release method using an open gas pressure P3 of a starting pilot gas storage container 6 for starting carbon dioxide or the like which has been widely used in gas fire extinguishing equipment as a starting means of the depressurizing device 2D. What did
As a result, the operation of the decompression device in an emergency can be performed without any trouble as in the case of the sealing plate opening method, and the usage of the decompression device can be diversified.

The pressure reducing device 2D has a gas receiving side 21 on the pressure receiving surface.
a, a supply side gas pressure P0 and a gas outlet side 21b from the gas outlet side 21b.
The outlet side gas pressure P2 from the gas outlet side 21b to the pressure receiving surface via the outlet side gas supply channel 21g, and the outlet side gas from the gas outlet side 21b via the outlet side gas supply channel 21c. An operation of connecting the flow path valve 22 and the piston 26 by projecting from the pressure receiving surface of the piston 26 and engaging the flow path valve 22 with the piston 26 configured to apply the pressure P2 at a predetermined area ratio. It comprises a rod 27 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 2D is directly connected to the gas storage container 1, and is connected to the gas supply side 2 of the gas flow path 21.
1a, gas outlet side 21b and outlet side gas supply flow path 21
c, 21g, a valve seat 23 and a main body 20a forming a part of a cylinder 25 accommodating a piston 26;
And a lid 20b constituting a part of the cylinder 25 accommodating the piston 26, and these are integrally assembled to be constituted.

Further, the pressure reducing device 2D is provided with an opening 21h for introducing the open gas pressure P3 of the pilot gas storage container 6 for starting carbon dioxide or the like as a means for starting the pressure reducing device 2D, in the middle of the outlet side gas supply passage 21g. By forming a check valve 29 for preventing gas from flowing backward in the outlet side gas supply flow path 21g at the introduction portion 21h, the pressure of the gas in the gas storage container 1 was reduced due to the release of gas. Even in this case, the outlet-side maximum gas pressure P2max is continuously applied to the pressure receiving surface of the piston 26.

Next, the operation of the pressure reducing device 2D will be described. By opening the pilot gas storage container 6 for starting carbon dioxide or the like, the open gas pressure P3 is increased by the introduction unit 21.
h. As a result, the open gas pressure P3
Is applied to the pressure-receiving surface of the piston 26 from the introduction portion 21h via the outlet-side gas supply flow path 21g, and the piston 26 is operated against the urging force of the spring 28, thereby projecting against the pressure-receiving surface of the piston 26. The flow path valve 22 is operated via the operation rod 27 provided to open the gas flow path 21. When the gas flow path 21 is opened, gas flows into the gas outlet side 21 b from the gas storage container 1 via the gas supply side 21 a. The supply-side gas pressure P0 of the gas in the storage container 1 (180 kgf / cm ^{2 at the} initial state, 35 ° C., 180 kgf / cm ² ) and the outlet-side gas pressure P2 are also provided on the pressure receiving surface of the piston 26 at the outlet-side maximum gas pressure P2max
And the outlet-side gas pressure P2 are respectively applied at a predetermined area ratio, so that the following equation (7):
According to (8), the flow path valve 22 and the piston 26 are instantaneously equilibrated, and the outlet side gas pressure P2 is the area of the pressure receiving surface of the flow path valve 22 and the piston 26 to which the supply side gas pressure P0 and the outlet side gas pressure P2 are applied. The pressure is reduced to a predetermined value defined by the ratio.

[0049] ^{(B2 2 -B1 2) P2max +} (A 2 over ^{C 2) P2 = (B2 2} -C 2) P2 + A 2 · P0 ····· (7) P2 = (B2 2 -B1 2) P2max- ^{a 2 · P0 / (B2 2} -A 2) ····· (8) where, a is the diameter of the valve seat 23, B1 is the small-diameter portion which communicates with the opening 24 of the piston 26 diameter, B2 piston 26
Is the diameter of the large diameter portion to which the supply side gas pressure P0 is applied, and C is the diameter of the operation rod 27.

According to the pressure reducing device 2D of the present embodiment, the pressure of the gas in the gas storage container 1 due to the release of the gas, that is,
Even when the supply-side gas pressure P0 decreases, the amount of released gas can be kept at a high level. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the time required for releasing the extinguishing agent gas can be reduced.

As described above, the decompression devices 2, 2A, 2B,
2C and 2D have been described.
2A, 2B, 2C, and 2D can realize a pressure reducing device that reduces the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure with a compact structure, and the supply-side gas pressure and the outlet-side gas pressure can be reduced. By changing the area ratio of the pressure receiving surface of the flow path valve and the piston, the outlet side gas pressure with respect to the supply side gas pressure can be adjusted in a wide range and with high precision. The present invention is not limited to system 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 and a semiconductor manufacturing plant.

Further, the pressure reducing devices 2, 2A,
The configurations of 2B, 2C, and 2D can be changed by rearranging the configurations of the embodiments without departing from the spirit of the embodiments.

[0053]

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 by changing the area ratio of the pressure receiving surface of the flow path valve and the piston to which the supply side gas pressure and the outlet side gas pressure are applied, the outlet side gas pressure with respect to the supply side gas pressure can be widened. The range can be adjusted with high accuracy. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the filling pressure of the 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 storage container can be reduced, and it is not necessary to increase the pressure resistance grade of the secondary equipment of the fire extinguishing equipment. Since there is no need to increase the pressure resistance grade of the side equipment, the fire extinguishing agent gas stored in a gaseous state in the fire extinguishing agent gas storage container can be applied to existing equipment as it is.

Further, by connecting the piston and the flow path valve with the operation rod, the response performance of the pressure reducing device can be improved, and the spring for biasing the piston and the flow path valve are urged in the closing direction. The spring can be shared by one spring, and the structure of the pressure reducing device can be simplified.

Further, by arranging a check valve in the gas supply passage for the piston, the supply-side maximum gas pressure or the outlet-side maximum gas pressure is continuously applied to the pressure receiving surface of the piston. Even when the side gas pressure decreases, the amount of released gas can be kept at a high level. For this reason, when this pressure reducing device is applied to gas fire extinguishing equipment, the time required for releasing the extinguishing agent gas can be reduced.

Further, by adopting a sealing plate opening method which has been widely used for gas fire extinguishing equipment as a starting means of the pressure reducing device, the operation of the pressure reducing device in an emergency can be performed without any trouble.

Further, when connecting the pressure reducing device to the gas storage container, the reliability of the connection can be improved by adopting a differential pressure type container valve which has been widely used in gas fire extinguishing equipment. It is possible to operate the pressure reducing device and the differential pressure type container valve in an emergency without any trouble.

In addition, by adopting an open gas release system which has been widely used in gas fire extinguishing equipment as a starting means of the pressure reducing device, the operation of the pressure reducing device in an emergency can be performed without any trouble.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a pressure reducing device of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the pressure reducing device of the present invention.

FIG. 3 is a decompression device of the present invention (first embodiment and second embodiment).
FIG. 4 is an explanatory diagram showing the pressure reduction characteristics of FIG.

FIG. 4 is a sectional view showing a third embodiment of the pressure reducing device of the present invention.

FIG. 5 is a sectional view showing a fourth embodiment of the pressure reducing device of the present invention.

FIG. 6 is a sectional view showing a fifth embodiment of the pressure reducing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas storage container 2, 2A, 2B, 2C, 2D Decompression device 21 Gas flow path 22 Flow path valve 23 Valve seat 24 Opening 25 Cylinder 26 Piston 27 Operating rod 28 Spring 29 Check valve 3 Opening device 35 Sealing plate 4 Differential pressure type Container valve 45 Seal plate 5 Connection member 6 Pilot gas storage container for starting P0 Supply gas pressure P0max Supply gas maximum gas pressure P2 Outlet gas pressure P2max Outlet gas pressure P3 Open gas pressure

Continuation of the front page (56) References JP-A-56-161250 (JP, A) JP-A-6-149384 (JP, A) JP-A-54-5222 (JP, A) JP-A-60-41109 (JP, A) JP-A-54-63030 (JP, A) JP-A-61-38277 (JP, A) JP-A-2-143611 (JP, U) JP-A-40-25192 (JP, Y1) (58) Field surveyed (Int.Cl. ⁷ , DB name) G05D 16/00-16/20

Claims (7)

(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 such that a supply-side gas pressure (P0) and an outlet-side gas pressure (P2) are applied to the pressure receiving surface at a predetermined area ratio, respectively, and a flow valve that controls the operation of the piston (26). And a control rod (27) for transmitting to the (22) and operating the flow path valve (22). 2. 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 such that an outlet gas pressure (P2) is applied to the pressure receiving surface at a predetermined area ratio, and an operation of the piston (26) is transmitted to the flow path valve (22). A pressure reducing device, comprising an operating rod (27) for operating a valve (22). 3. The piston (26) and a flow valve (22).
The pressure reducing device according to claim 1 or 2, wherein the pressure reducing device is connected by an operating rod (27). 4. A piston (2) is provided by disposing a check valve (29) in a gas supply passage (11, 21d, 21e, 21f, 21g) for the piston (26).
4. The pressure reducing device according to claim 1, wherein the supply side maximum gas pressure (P0max) or the outlet side gas pressure (P2max) is continuously applied to the pressure receiving surface of (6). 5. The pressure reducing device according to claim 1, wherein the device is started by opening the sealing plate (35, 45). 6. A gas outlet side (41) of a differential pressure type valve (4).
2. The method according to claim 1, wherein the connection is made to b).
The pressure reducing device according to 3, 4, or 5. 7. The apparatus according to claim 1, wherein the apparatus is started by applying an open gas pressure (P3).
Or the decompression device according to 4.