JP2008175261A - Pressure reducing device and gas-based fire extinguishing installation using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive pressure reducing device having simple construction with fewer components while eliminating the influences of supply side gas pressure on a flow path valve arranged in a gas flow path and stably maintaining outlet side gas pressure. <P>SOLUTION: Supply side gas pressure P0 is applied to the flow path valve 22 arranged in the gas flow path 21 in the direction perpendicular to the sliding direction of the flow path valve 22. Outlet side gas pressure P2 and reference gas pressure P1 are each applied at a predetermined area rate to the flow path valve 22 in the sliding direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a decompression device and a gas fire extinguishing facility using the decompression device.

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

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

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

  However, in recent years, problems related to the destruction of the ozone layer have been raised on a global scale, and production of fire extinguishing agents containing halogenated hydrocarbon components such as halon gas was discontinued in January 1994. I can no longer do it.

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

By the way, in order to solve the many problems of the conventional gas fire extinguishing equipment, the applicant of the present invention has previously introduced a perfluoroalkane (perfluorobutane (C ₄₎ that does not destroy the ozone layer with nitrogen gas or nitrogen gas. F ₁₀ )), hydrogenofluoroalkane (trifluoromethane (CHF ₃ ), heptafluoropropane (C ₃ HF ₇ ) or pentafluoroethane (C ₂ HF ₅ )) or hydrogenofluorohalogenoalkane (iodotrifluoromethane ( CF ₃ I)) (hereinafter collectively referred to as “fluorine compounds”) mixed gas (hereinafter simply referred to as “mixed gas”) in which at least one kind is mixed at a ratio of 10% by volume or less. Gas-based fire extinguishing equipment used as an agent was proposed (see Patent Documents 1 and 2).

However, even when nitrogen gas or mixed gas is used as a fire extinguisher for gas fire extinguishing equipment, it has been found that there are the following problems.
(1) Nitrogen gas or mixed gas as a fire extinguisher of gas fire extinguishing equipment uses what is pressurized and stored in a gas state, so carbon dioxide or a gas stored in a pressurized state is used. Compared to halon gas, the number of extinguishing agent gas storage containers required for extinguishing the fire extinguishing target section of the same volume is required several times, and a large installation space for the extinguishing agent gas storage container 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 the inert fire extinguishing agent gas filling the fire extinguishing agent gas storage container. Therefore, the secondary side equipment of the fire extinguishing equipment such as the selection valve, main pipe, branch pipe, injection head, etc. will be subjected to a high gas pressure of the inert fire extinguishing agent gas. The pressure-resistant grade needs to be raised, and the equipment cost becomes remarkably high, and it cannot be applied to existing equipment.

Therefore, the present applicant reduces the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure in order to solve the above-described problems when nitrogen gas or a mixed gas is used as a fire extinguishing agent for a gas fire extinguishing facility. For example, when applied to a gas fire extinguishing equipment, a decompression device capable of increasing the filling pressure of the inert fire extinguishing gas without increasing the pressure resistance grade of the secondary equipment of the gas fire extinguishing equipment (See Patent Documents 3 to 4).
JP-A-8-141102 JP-A-8-243186 JP-A-8-299492 JP-A-9-319439

  By the way, the above depressurization apparatus can sufficiently achieve the intended purpose of depressurizing the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure. There is a problem that the road valve is easily influenced by the supply side gas pressure, the outlet side gas pressure fluctuates, the structure is complicated, and the number of parts increases.

  In view of the problems of the conventional pressure reducing device, the flow path valve disposed in the gas flow path is not affected by the supply side gas pressure, and the outlet side gas pressure can be stably maintained. An object of the present invention is to provide a decompression device that is simple, has a small number of parts, and is low in cost, and a gas fire extinguishing equipment using the decompression device.

  In order to achieve the above object, the decompression device of the present invention is such that the supply-side gas pressure (P0) is applied to the flow path valve disposed in the gas flow path in a direction orthogonal to the sliding direction of the flow path valve. In addition, the outlet side gas pressure (P2) and the reference gas pressure (P1) are each applied at a predetermined area ratio in the sliding direction of the flow path valve.

  In this case, the flow path valve disposed in the gas flow path is constituted by a celestial tubular valve body, and the gas supply port is made to slide by sliding the peripheral wall of the valve body in parallel with the opening surface of the gas supply port. In addition to opening and closing, the outlet gas pressure (P2) can be applied to the outer top surface of the valve body, and the reference gas pressure (P1) can be applied to the inner top surface.

  Further, the flow path valve disposed in the gas flow path is constituted by a cylindrical valve body having a large diameter flange portion at the end, and the peripheral wall of the valve body is slid in parallel with the opening surface of the gas supply port. As a result, the gas supply port is opened and closed, the outlet side gas pressure (P2) is at the outer end face of the large diameter collar formed at the end of the valve body, and the reference gas pressure (P1) is at the inner end face. Such a configuration can be adopted.

  Further, the gas supply port can be formed so that the supply side gas pressure (P0) applied to the flow path valve is offset.

  Further, the area to which the outlet side gas pressure (P2) is applied and the area to which the reference gas pressure (P1) is applied can be set so that the outlet side gas pressure (P2) matches the reference gas pressure (P1). .

  Furthermore, the gas fire extinguishing equipment of the present invention releases an inert fire extinguishing gas stored in a gas state in a fire extinguisher gas storage container into the fire extinguishing target section, and the extinguishing agent concentration in the fire extinguishing target section is extinguished. In the gas fire extinguishing equipment configured to extinguish by maintaining the concentration or more, the decompression device can be used to decompress the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure.

  According to the decompression device of the present invention, the supply side gas pressure (P0) is applied to the flow path valve disposed in the gas flow path in a direction orthogonal to the sliding direction of the flow path valve, and By configuring the outlet side gas pressure (P2) and the reference gas pressure (P1) at a predetermined area ratio in the sliding direction of the road valve, the flow path valve disposed in the gas flow path can supply the supply side gas. It is less affected by pressure, can stably maintain the outlet side gas pressure, has a simple structure, has a small number of parts, and can be a low-cost decompression device.

  More specifically, in the decompression device of the present invention, the flow path valve disposed in the gas flow path is constituted by a celestial tubular valve body, and the peripheral wall of the valve body is formed with the opening surface of the gas supply port. The gas supply port is opened and closed by sliding in parallel, the outlet gas pressure (P2) is applied to the outer top surface of the valve body, and the reference gas pressure (P1) is applied to the inner top surface. The flow path valve arranged in the gas flow path is constituted by a cylindrical valve body having a large diameter flange at the end, and the peripheral wall of the valve body is parallel to the opening surface of the gas supply port The gas supply port is opened and closed by sliding to the end, and the outlet side gas pressure (P2) is applied to the outer end surface of the large diameter collar portion formed at the end of the valve body, and the reference gas pressure (P1) is applied to the inner end surface. ) Can be configured as such.

  Further, by forming the gas supply port so that the pressure of the supply side gas pressure (P0) applied to the flow path valve is offset, the influence of the supply side gas pressure received by the flow path valve disposed in the gas flow path is affected. It can be further reduced.

  Further, by setting the area to which the outlet side gas pressure (P2) is applied and the area to which the reference gas pressure (P1) is applied so that the outlet side gas pressure (P2) matches the reference gas pressure (P1), The outlet side gas pressure can be easily controlled.

  Furthermore, according to the gas fire extinguishing equipment of the present invention, the inert fire extinguishing gas stored in a gas state in the fire extinguisher gas storage container is discharged into the fire extinguishing target section, and the concentration of the fire extinguishing agent in the fire extinguishing target section In the gas fire extinguishing equipment that extinguishes by maintaining the flame extinguishing concentration or more, by using the pressure reducing device to reduce the high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure, The pressure can be stably maintained, and a low-cost gas fire extinguishing facility can be provided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a decompression device of the present invention and a gas fire extinguishing facility using the decompression device will be described based on the drawings.

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

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

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

  The container valve 2 disposed in the extinguishing agent gas storage container 1 has a high-pressure supply side gas pressure P0 shown in FIGS. 2 to 3 as a constant-pressure gas source (in this example, a constant-pressure gas source, as shown in FIG. As shown, the startup gas containers 11-1, 11-2, and 11-3 filled with nitrogen gas (for example, 11 MPa at 35 ° C. are not particularly limited) are used. ) Of the first embodiment of the present invention that can be reduced to a predetermined outlet gas pressure P2 defined by the reference gas pressure P1 from (not limited to, for example, 11 MPa at 35 ° C.). Use a decompressor.

  The decompression device applies a supply-side gas pressure P0 to the flow path valve 22 disposed in the gas flow path 21 in a direction orthogonal to the sliding direction of the flow path valve 22, and the flow path valve 22 The outlet side gas pressure P2 and the reference gas pressure P1 are applied in a predetermined area ratio in the sliding direction.

More specifically, the flow path valve 22 disposed in the gas flow path 21 is constituted by a dome-shaped tubular valve body, and the peripheral wall 22a of this valve body is slid in parallel with the opening surface of the gas supply port 21a. Thus, the gas supply port 21a is opened and closed, and the outlet gas pressure P2 is applied to the outer top surface 22c of the valve body, and the reference gas pressure P1 is applied to the inner top surface 22d.
In this decompression device, the flow path valve 22 disposed in the gas flow path 21 is not affected by the supply side gas pressure P0, can stably maintain the outlet side gas pressure P2, and has a simple structure, It can be manufactured at low cost with few points.
Here, the terms “cylinder-shaped”, “outer top surface”, and “inner top surface” are used for convenience because the decompression device is usually used in the state shown in FIG. However, the terminology does not limit the installation direction of the decompression device, and for example, it does not exclude use in a direction opposite to the state shown in FIG.

In this case, the flow path valve 22 formed of a celestial tubular valve body is urged in the direction of closing the gas supply port 21a by the spring constant spring 23 that does not affect the reference gas pressure P1. Like that.
When the flow path valve 22 is in a closed state, the inner surface of the peripheral wall 22a is in sliding contact with O-rings 24a and 24b disposed on both upper and lower sides of the gas supply port 21a (FIG. 2 (a )), The gas supply port 21a is sealed, and the opening side of the flow path valve 22 and the inner space of the inner top surface 22d are always shut off.
The flow path valve 22 slides along a constant pressure gas supply pipe 25 for introducing the reference gas pressure P1 from a constant pressure gas source that penetrates the top portion 22b and enters the inner space of the inner top surface 22d. Like that.
Further, the constant pressure gas supply pipe 25 is in sliding contact with an O-ring 24c disposed in the through hole of the top portion 22b of the flow path valve 22, so that the inner space of the inner top surface 22d is blocked from the outside.

  In addition, as in the modification shown in FIG. 5, an O-ring 24a is provided on the flow path valve 22 side, or instead of the O-rings 24a, 24b, and 24c, a known material or shape sealing mechanism is appropriately selected. Needless to say, it can be used.

Further, as shown in FIG. 3A, the gas supply ports 21a are formed symmetrically in the radial direction, more specifically, at an angular interval of 90 ° in the four directions. Note that the direction (angular interval) of the gas supply port 21a is not limited to that of the present embodiment, but in the case of two directions, the angular interval of 180 °, in the case of three directions, the angular interval of 120 °, n ( In the case of the (n: integer of 2 or more) direction, it is set to be point-symmetric in the radial direction, such as an angular interval of 360 ° / n.
Thereby, the influence of the supply side gas pressure P0 which the flow path valve 22 arrange | positioned in the gas flow path 21 receives can be offset, and the influence of the supply side gas pressure P0 can be decreased.

Further, as shown in FIG. 3B, the gas supply port 21a is formed in a deformed shape in which the opening size gradually increases upward.
This makes it possible to accurately adjust the gas flow rate according to fluctuations in the supply-side gas pressure P0, particularly when the supply-side gas pressure P0 with a small gas flow rate is high. The influence of fluctuations in P0 can be reduced.
In addition, the shape of the gas supply port 21a is not limited to the above shape, and may be formed in an arbitrary shape such as a circle, an oval, and a rectangle.

Here, the pressure reducing device substantially cancels the area where the outlet side gas pressure P2 is applied, and then substantially determines the area where the outlet side gas pressure P2 is substantially applied and the area where the reference gas pressure P1 is substantially applied. By making them equal, the outlet side gas pressure P2 matches the reference gas pressure P1.
Specifically, if the area of the inner top surface 22d of the flow path valve 22 is A1 and the area of the constant pressure gas supply pipe 25 is A2 after offsetting the area where the outlet side gas pressure P2 is applied, the following formula (1 ), And the outlet side gas pressure P2 matches the reference gas pressure P1 regardless of the magnitude (variation) of the supply side gas pressure P0.
P2 × (A1-A2) = P1 × (A1-A2) (1)
Thereby, control of an exit side gas pressure can be performed simply.

Next, the operation of the container valve 2 comprising this decompression device will be described.
Nitrogen gas having a reference gas pressure P1 is supplied into the inner space of the inner top surface 22d from the starting gas containers 11-1, 11-2, and 11-3 as constant pressure gas sources through the constant pressure gas supply pipe 25. Thus, the flow path valve 22 is moved upward as shown in FIGS. 2A to 2B against the urging force of the spring 23, and the gas supply port 21a is opened.
When the gas supply port 21a is opened, the inert fire extinguishing agent gas flows from the fire extinguishing agent gas storage container 1 to the gas outlet side 21b of the gas passage 21, and the outer top surface of the passage valve 22 is adjusted accordingly. The outlet side gas pressure P2 is also applied to 22c.
For this reason, according to said Formula (1), the flow path valve 22 equilibrates instantaneously and in this example, the exit side gas pressure P2 is the gas container 11-1, 11-2, 11-3 for starting. It is held at a value equal to the reference gas pressure P1.

In this case, the outlet side gas pressure P2 held by the container valve 2 comprising the decompression device is a constant pressure gas source, that is, the reference gas pressure P1 itself of the startup gas containers 11-1, 11-2, 11-3. Or adjusting the reference gas pressure P1 with the pressure regulators in the start-up gas containers 11-1, 11-2, 11-3, and changing the shape of the flow path valve 22. Although it can be changed by making it different, it is desirable that the outlet side gas pressure P2 is maintained at a value equal to the reference gas pressure P1 in the design of the inert gas fire extinguishing equipment.
The container valve 2 formed of a decompression device stops the supply of nitrogen gas from the constant pressure gas source, that is, the start-up gas containers 11-1, 11-2, 11-3, and is provided in the constant pressure gas supply pipe 25. It has a function of closing the gas supply port 21a by discharging the nitrogen gas, and it is possible to use this function to close the fire extinguisher gas storage container once opened. It is.

Next, the operation in the event of a fire of the above gas fire extinguishing equipment to which the container valve 2 comprising this decompression device is applied will be described.
Now, assuming that a fire has occurred in the fire extinguishing target section 6-1, when the fire finder operates a push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-1, the electrical signal is opened to the start gas container. The solenoid 12-1 is operated and the activation gas container 11-1 is opened. The start-up gas released by opening the start-up gas container 11-1 is first introduced into the selection valve opening device 10-1 to open the selection valve 9-1, and then the non-return valve 14-. 1 passes through the starting gas line 13-1, passes through the non-return valve 14-A and the non-return valve 14-B, reaches all the container valves 2, and opens all five fire extinguishing 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 opened. By the way, because the container valve 2 uses a pressure reducing device that can reduce the high supply gas pressure P0 to a predetermined outlet gas pressure P2 defined by the reference gas pressure P1 from the constant pressure gas source, The inert gas regulated to the reference gas pressure P1 from the five fire extinguisher gas storage containers 1 opened is the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-1, the main pipe 5-1, It is sent to the ejection head 7-1 through the branch pipe 8-1, and discharged from the ejection head 7-1 into the fire extinguishing target section 6-1.

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

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

  As described above, the case where there are three fire extinguishing target sections and the number of the extinguishing agent gas storage containers 1 is described as an example. However, the number of extinguishing target sections, the number of the extinguishing agent gas storage containers 1 and the fire extinguishing to be opened are described. The number of the agent gas storage containers 1 is not limited to that of the present embodiment (the same applies to the following modified embodiments), and can be arbitrarily set as necessary.

  By using the decompression device described above, the container valve 2 can have a simple structure, a small number of parts, and a low cost structure, and the value of the outlet side gas pressure P2 can be changed to the reference gas pressure P1. Therefore, it is possible to adjust with high accuracy in a wide range.

In the gas fire extinguishing equipment, the decompression device is applied to the container valve 2. However, the present invention is not limited to this. For example, as shown in FIG. A decompressor 18 similar to the above is disposed at appropriate positions from the storage container 1 to the selection valves 9-1, 9-2, 9-3, and the starting gas containers 11-1, 11-2, 11-3. Separately, a constant pressure gas container 19 filled with nitrogen gas (for example, 11 MPa at 35 ° C.) may be provided as a constant pressure gas source.
When the decompression device 18 is provided, a normal container valve is used as the container valve 2.
Further, in the case of the decompression device applied to the container valve 2, although not particularly limited, for example, the diameter (inner diameter) of the gas flow path 21 is formed to be about 8 mm. If necessary, for example, a large diameter of about 100 to 200 mm can be used.
And since the primary side apparatus of fire extinguishing equipment, such as the container valve 2 from the extinguishing agent gas storage container 1 to the decompression device 18, the connecting pipe 3, and the collecting pipe 4, is applied with a high gas pressure of the inert extinguishing gas These primary devices must be configured to withstand this high gas pressure, but the collecting pipe 4 and the like have a smaller inner diameter than the main pipes 5-1, 5-2, and 5-3. Since the pressure resistance is high, it is often unnecessary to raise the pressure resistance grade of the primary equipment of the fire extinguishing equipment, so that the equipment cost can be reduced and it can be applied to existing equipment as it is.

By the way, although the said pressure reduction apparatus comprised the flow-path valve 22 arrange | positioned in the gas flow path 21 with the valve body with a ceiling, it is not limited to this, The 1st of the pressure reduction apparatus of this invention shown in FIG. As in the second embodiment, the flow path valve 22 is composed of a cylindrical valve body having a large diameter flange portion 22e at the end, and the peripheral wall 22a of the valve body is slid parallel to the opening surface of the gas supply port 21a. The gas supply port 21a is opened and closed by being moved, the outlet side gas pressure P2 is applied to the outer end surface 22f of the large diameter flange portion 22e formed at the end of the valve body, and the reference gas pressure P1 is applied to the inner end surface 22g. Each of them can also be configured.
In this decompression device, the flow path valve 22 disposed in the gas flow path 21 is not affected by the supply side gas pressure P0, can stably maintain the outlet side gas pressure P2, and has a simple structure, It can be manufactured at low cost with few points.
The other configurations and operations of the decompression device of the present embodiment are the same as those of the decompression device of the first embodiment.

  As mentioned above, although the decompression device of the present invention and the gas fire extinguishing equipment using the decompression device have been described based on a plurality of examples, the present invention is not limited to the configuration described in the above examples, The configuration can be changed as appropriate without departing from the spirit of the invention.

  In the decompression device of the present invention and the gas fire extinguishing equipment using the decompression device, the flow path valve disposed in the gas flow path is not affected by the supply side gas pressure, and the outlet side gas pressure can be stably maintained. Because the structure is simple and the number of parts is small and can be manufactured at low cost, its application target is not limited to the above-mentioned gas fire extinguishing equipment, for example, various types of equipment at a constant pressure in nuclear power plants, semiconductor manufacturing plants, etc. The present invention can be applied to a very wide range such as a constant pressure gas supply facility for supplying the gas.

It is explanatory drawing which shows an example of a gas fire extinguishing equipment. 1 shows a first embodiment of the decompression device of the present invention, where (a) the flow path valve is in a closed state and (b) the flow path valve is in an open state. (A) is XX sectional drawing of FIG.2 (b), (b) is a development view of a gas supply port. It is explanatory drawing which shows the modification of gas type fire extinguishing equipment. The modification of 1st Example of the pressure reduction apparatus of this invention is shown, (a) When a flow-path valve is a closed state, (b) When a flow-path valve is an open state, respectively are shown. The 2nd Example of the decompression device of this invention is shown, (a) When a flow-path valve is a closed state, (b) When a flow-path valve is an open state, respectively is shown.

Explanation of symbols

1 Fire extinguisher gas storage container 2 Container valve (pressure reduction device)
21 Gas flow path 21a Gas supply port 21b Gas outlet side 22 Flow path valve 22a Peripheral wall 22b Top part 22c Outer top face 22d Inner top face 22e Large diameter collar part 22f Outer end face 22g Inner end face 23 Spring 24a O-ring 24b O-ring 24c O Ring 25 Constant pressure gas supply pipe 6 Fire extinguishing target section 7 Injection head 18 Pressure reducing device P0 Supply side gas pressure P1 Reference gas pressure P2 Outlet side gas pressure

Claims (6)

  The supply side gas pressure (P0) is applied to the flow path valve disposed in the gas flow path in a direction perpendicular to the sliding direction of the flow path valve, and the outlet side in the sliding direction of the flow path valve. A pressure reducing device characterized in that the gas pressure (P2) and the reference gas pressure (P1) are applied at a predetermined area ratio.   The flow path valve disposed in the gas flow path is constituted by a celestial tubular valve body, and the gas supply port is opened and closed by sliding the peripheral wall of the valve body in parallel with the opening surface of the gas supply port. The pressure reducing device according to claim 1, wherein the outlet side gas pressure (P2) is applied to the outer top surface of the valve body, and the reference gas pressure (P1) is applied to the inner top surface.   A flow path valve disposed in the gas flow path is configured by a cylindrical valve body having a large diameter flange at the end, and the peripheral wall of the valve body is slid parallel to the opening surface of the gas supply port. The gas supply port is opened and closed, and the outlet side gas pressure (P2) is applied to the outer end surface of the large diameter collar portion formed at the end of the valve body, and the reference gas pressure (P1) is applied to the inner end surface. The decompression device according to claim 1, wherein the decompression device is configured as described above.   4. The decompression device according to claim 1, wherein the gas supply port is formed so that the pressure of the supply side gas pressure (P0) applied to the flow path valve is offset.   The area on which the outlet side gas pressure (P2) is applied and the area on which the reference gas pressure (P1) is applied are set so that the outlet side gas pressure (P2) matches the reference gas pressure (P1). The decompression device according to claim 1, 2, 3 or 4.   Extinguishing fire extinguishing gas stored in a fire extinguisher gas storage container in a gaseous state is released into the fire extinguishing target compartment and extinguishing the fire by maintaining the extinguishing agent concentration in the extinguishing target compartment above the extinguishing concentration. A gas fire extinguishing system, wherein the decompression device according to claim 1, 2, 3, 4 or 5 is used to decompress a high-pressure supply-side gas pressure to a predetermined outlet-side gas pressure. Fire extinguishing equipment.

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