JP2001095936A - Gas fire extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide gas fire extinguishing equipment exhibiting a high fire extinguishing effect even in a facility having an opening that cannot be closed or is hard to close by maintaining the concentration of the fire extinguishing agent for a fixed period of time. SOLUTION: In gas fire extinguishing equipment intended for extinguishing a fire by releasing a gas fire extinguishing agent stored in a fire extinguishing agent storage container 1 into a section 6 as a target of fire extinguishing and maintaining the concentration of the fire extinguishing agent in the firefighting target section 6, a means 10 to additionally release the fire extinguishing agent to supplement the fire extinguishing agent decreasing due to outflow from the opening 8 of the firefighting target section 6 by continuous additional release after a prescribed quantity of the fire extinguishing agent to increase the concentration of the fire extinguishing agent in the firefighting target section 6 to a quenching concentration or higher is released is installed, so that the concentration of the fire extinguishing agent in the firefighting target section 6 may be maintained at a quenching concentration or higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for discharging a gas fire extinguishing agent stored in a fire extinguishing agent 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 fire extinguishing concentration. The present invention relates to a gas fire extinguishing system for extinguishing a fire.

[0002]

2. Description of the Related Art Conventionally, gas fire extinguishing agents stored in a fire extinguishing agent storage container are discharged into a fire extinguishing target compartment, and the fire extinguishing agent is extinguished by setting the concentration of the fire extinguishing agent in the fire extinguishing target compartment to be equal to or higher than the flame-extinguishing concentration. As a gas fire extinguishing system, a gas fire extinguishing agent that uses a gas fire extinguishing agent such as carbon dioxide, halon gas, or nitrogen gas has been put into practical use.

[0003] In recent years, problems relating to the destruction of the ozone layer have been raised on a worldwide scale, and the production of fire extinguishers containing halogenated hydrocarbon components such as halon gas was discontinued in January 1994. It is virtually unusable.

On the other hand, for a fire extinguisher using carbon dioxide as a fire extinguishing agent, the design concentration of carbon dioxide in a fire extinguishing target compartment at the time of fire extinguishing is usually set to about 35%.
For this reason, if a person is present in the fire extinguishing target compartment, there is a problem that the toxicity of carbon dioxide (narcotic) may cause a life-threatening situation.

[0005] In order to address this problem, there is no
Even if a fire extinguisher is present, fire-extinguishing
To prevent generation of rare gas, use a rare gas such as nitrogen gas or argon.
Perfluoroalkane that does not destroy gas and ozone layers
-Fluorobutane (C_FourF_Ten)), Hydrogenofur
Oroalkane (trifluoromethane (CHF_Three), Hep
Tafluoropropane (C_ThreeHF₇) Or pentafluoroe
Tan (C_TwoHF_Five)), Hydrogenofluorohalogeno
Alkanes (Iodotrifluoromethane (CF _ThreeI))
Fluorine gases such as
A mixed gas mixed at a predetermined ratio (other gas such as carbon dioxide)
Including the case of mixing ) With a fire extinguisher (as used herein)
These fire extinguishing agents are collectively referred to as "inert gas-based fire extinguishing agents".
Fire extinguishing equipment that uses this inert gas
It is called "inert gas fire extinguishing equipment". )
Fire equipment has been proposed.

In the case of a fire extinguishing system using carbon dioxide as a fire extinguishing agent, it is assumed that no person is present in the fire extinguishing target compartment. Therefore, the concentration of the fire extinguishing agent in the fire extinguishing target compartment is set freely. Therefore, for example, it is possible to set the concentration of the fire extinguishing agent in the fire extinguishing target compartment to be twice or more the concentration of the fire extinguishing agent, whereas the fire extinguishing agent using the above-mentioned inert gas-based extinguishing agent In equipment, it is assumed that there is a person in the fire extinguishing target compartment or there is a possibility that there is a person. Therefore, there are restrictions on setting the concentration of the fire extinguishing agent in the fire extinguishing target compartment (fire extinguisher If the concentration of the fire extinguishing agent is higher than necessary, a situation related to human health may occur.) Usually, the concentration of the extinguishing agent in the fire extinguishing target compartment is set to about 1.2 to 1.4 times the concentration of the extinguishing flame. Had to be set.

[0007] In a fire extinguishing system using an inert gas-based fire extinguishing agent, a predetermined amount of fire extinguishing agent that can make the concentration of the extinguishing agent in the fire extinguishing target compartment approximately 1.2 to 1.4 times the flame-extinguishing concentration. If the agent is a rare gas such as nitrogen gas or argon, the release into the fire extinguishing target compartment is almost completed within one minute. In order to suppress the generation, the fire extinguishing equipment is designed so that the release into the fire extinguishing target compartment is almost completed within 10 seconds.

By the way, in these gas fire extinguishing systems,
Unlike water-based fire extinguishing equipment, it is necessary that the space to be extinguished be closed. Except for special local discharge systems, gas fire extinguishing systems generally extinguish fire by discharging fire extinguisher into a closed space and ensuring uniform fire extinguishing agent concentration in the space. It is an important factor to quickly raise the concentration of the extinguishing agent inside to a constant concentration and to maintain the concentration of the extinguishing agent that has risen for a certain period of time. Therefore, when an opening exists in a portion forming a space, a closing device is provided at the opening, and the opening is closed immediately before the extinguishing agent is discharged, thereby preventing the extinguishing agent from flowing out. In addition, if the conventional fire extinguishing agent made of carbon dioxide or halon cannot be closed or has an opening with a structure that is difficult to close, the additional amount of fire extinguishing agent required for the fire extinguishing target compartment is added according to the area of the opening. The fire extinguishing agent in an amount to which the amount of the extinguishing agent was added was discharged at a time, and the decrease in fire extinguishing performance was corrected by increasing the initial concentration of the extinguishing agent.

Maintaining the concentration of the extinguishing agent is important for an inert gas-based extinguishing agent which has restrictions on the setting of the concentration of the extinguishing agent in the fire extinguishing target compartment. Since the gas-based extinguishing agent has less cooling effect than the liquefied gas extinguishing agent, it is more important to maintain the extinguishing agent concentration.

[0010]

However, in a factory facility such as a painting booth, the entrance and exit of articles and a ventilation window for ventilation are always open, and this opening cannot be closed even when fire extinguishing agent is radiated. There is a current situation that it is difficult to apply gas fire extinguishing equipment due to its structure that is difficult to perform. In other words, when gas-based fire extinguishing equipment is applied to a facility that cannot be closed or has an opening that is difficult to close, as described above, the amount of fire extinguishing agent required for the fire extinguishing target compartment is added to the fire extinguishing agent according to the area of the opening. The fire extinguishing agent was released at a time after adding the amount of fire extinguishing agent.However, in such a conventional gas-based fire extinguishing system, even if the initial There is no problem if the fire is completely extinguished.However, if the fire has burned deep into the combustible and has been smoked, the extinguishing agent in the fire extinguisher compartment However, if the concentration of the compound drops even below the concentration of the extinction even partially, there is a problem that a re-ignition may occur from that location.

In the case of a fire extinguisher using carbon dioxide as a fire extinguishing agent, it is assumed that no person is present in the fire extinguishing target compartment, so that the concentration of the fire extinguishing agent in the fire extinguishing target compartment is set freely. It is possible. On the contrary,
In the case of fire extinguishing equipment that uses an inert gas-based fire extinguishing agent, there are cases in which it is assumed that a person is present in the fire extinguishing target compartment, and there are restrictions on setting of the concentration of the fire extinguishing agent in the fire extinguishing target compartment.

In view of the above-mentioned problems of the conventional gas fire extinguishing equipment, the present invention raises the concentration of the fire extinguishing agent to a predetermined flame-extinguishing concentration by initial discharge, and then adds a fire extinguishing agent corresponding to the amount of the fire extinguishing from the opening. It can not be closed by supplementing by discharging and maintaining the concentration of fire extinguisher for a certain period of time,
It is an object of the present invention to provide a gas fire extinguishing system having a high fire extinguishing effect even in a facility having an opening that is difficult to close.

[0013]

In order to achieve the above object, a gas fire extinguishing system according to the present invention discharges a gas fire extinguishing agent stored in a fire extinguishing agent storage container into a fire extinguishing target compartment, and In a gas fire extinguishing system that extinguishes the fire by setting the concentration of the extinguishing agent in the
After a specified amount of fire extinguishing agent has been released to make the concentration of fire extinguishing agent in the fire extinguishing compartment equal to or higher than the flame-extinguishing concentration, the addition of extinguishing agent to make up for the fire extinguishing agent, which is reduced by the flow out from the opening of the fire extinguishing compartment, by continuous additional discharge Discharging means is provided, and the concentration of the fire extinguishing agent in the fire extinguishing target compartment is maintained at a level equal to or higher than the extinction concentration for a predetermined time.

In this inert gas fire extinguishing system, the extinguishing agent is additionally discharged into the fire extinguishing section by the additional discharge means after a predetermined amount of the extinguishing agent having a concentration equal to or higher than the extinguishing concentration is discharged into the fire extinguishing section. The fire extinguishing agent that has been additionally released can continuously compensate for the fire extinguishing agent that has been reduced by spills from the openings, so even in facilities that cannot be closed or have openings that are difficult to close, fire extinguishing in the fire extinguishing target compartment for a long time The concentration of the agent can be maintained above the anti-inflammatory concentration.

In this case, the flow rate of the fire extinguishing agent is calculated based on the density difference between the gas mixture of the fire extinguishing agent and the air in the fire extinguishing target compartment and the air outside the fire extinguishing target compartment, and an additional amount is calculated based on the calculated flow out amount. The amount of extinguishing media can be set.

Thus, the concentration of the fire extinguishing agent in the fire extinguishing target compartment can be surely maintained at a level higher than the extinction concentration.

Further, a pressure control valve is used as a container valve for additional discharge, so that the flow rate of the fire extinguisher for additional discharge can be made substantially constant.

Since the flow rate of the extinguishing agent from the opening of the fire extinguishing target section is constant, it is desirable that the flow rate of the extinguishing agent additionally discharged is also constant. By doing so, the concentration of the fire extinguishing agent in the fire extinguishing target compartment can be efficiently and stably maintained.

On the other hand, a nozzle for additional discharge may be arranged near the opening of the fire extinguishing section, and the extinguishing agent additionally discharged may be mixed with the inflowing air.

Thus, it is possible to prevent the air and the extinguishing agent from being partially replaced due to the nozzle position, and to maintain a uniform concentration of the extinguishing agent in the fire extinguishing target compartment.

Further, an additional discharge nozzle may be provided near the opening of the fire extinguishing section, and the nozzle may form an air curtain for preventing the inflow of air from the opening.

Thus, it is possible to prevent air from flowing into the fire extinguishing target compartment, and to maintain the concentration of the fire extinguishing agent in the fire extinguishing target compartment more accurately for a longer time.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a gas fire extinguishing system according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a gas fire extinguishing system according to the present invention. This gas-based fire extinguishing equipment uses, for example, nitrogen gas as a gas-based fire extinguishing agent, and pressurizes and fills a plurality of fire extinguishing agent storage containers 1. Each fire extinguisher storage container 1
Is connected to a connecting pipe 3 via a container valve 2, the connecting pipe 3 is connected to a collecting pipe 4, and the collecting pipe 4 extends to a fire extinguishing target section 6.
5 '. Further, a pressure gauge (not shown) is attached to each fire extinguisher storage container 1 so that the gas pressure of the fire extinguisher in the fire extinguisher storage container 1 can be controlled. Selection valves 7 and 7 ′ are provided in the main pipes 5 and 5 ′, and a plurality of fire extinguishing target sections 6 are provided.
The fire extinguisher can be sent selectively to A plurality of nozzles 9 arranged at appropriate places in the fire extinguishing target section 6 are connected to the main pipe 5 extending to the fire extinguishing target section 6.

Usually, since the volumes of the fire extinguishing sections 6 are different, the amount of the fire extinguishing agent required to extinguish the fire is naturally different. For this reason, the diameter of the main pipes 5, 5 'is made different depending on the volume of each fire extinguishing section 6, and in the event of a fire,
The gas fire extinguishing equipment is configured so that the number of fire extinguisher storage containers 1 corresponding to the fire extinguishing target compartments 6 to be extinguished is opened. In this gas fire extinguishing equipment, the gas fire extinguishing agent stored in the fire extinguishing agent storage container 1 is discharged into the fire extinguishing target compartment 6 and the concentration of the fire extinguishing agent in the fire extinguishing target compartment is set to be equal to or higher than the flame-extinguishing concentration. Can extinguish fire.

The fire extinguisher compartment 6 has an opening 8 that cannot be closed or is difficult to close.
An additional fire extinguishing agent release means 10 is provided. As described above, the additional discharge means 10 emits a predetermined amount of the fire extinguishing agent that makes the concentration of the extinguishing agent in the fire extinguishing target compartment 6 equal to or higher than the flame-extinguishing concentration. Of fire extinguishing agent can be supplemented by continuous additional discharge, whereby the concentration of the fire extinguishing agent in the fire extinguishing target compartment 6 can be reduced over a long period of time (typically 10 to 30 minutes, and if necessary, 30 minutes or more). It is intended to be able to maintain the concentration above the anti-inflammation.

The additional fire extinguishing agent discharge means 10 uses nitrogen gas as a fire extinguishing agent and pressurizes the nitrogen gas to fill a plurality of additional fire extinguishing agent storage containers 11. Each additional fire extinguishing agent storage container 11 is connected to a connecting pipe 13 via a container valve 12. The connecting pipe 13 is connected to a collecting pipe 14, and the collecting pipe 14 is connected to the fire extinguishing target section 6. The main pipe 5 is connected to the main pipe 5 extending to the main pipe. In this case, the fire extinguishing agent is discharged from the nozzle 9 by the additional discharging means 10. The collecting pipes 14 are provided with selection valves 16 and 16 ′ so that a fire extinguishing agent can be selectively sent to a plurality of fire extinguishing sections 6. In addition, the above-mentioned collecting pipe 4
Each of the collecting pipes 14 is provided with a check valve 15. Furthermore, on the secondary side of the selection valves 16, 16 ',
Orifices 19, 19 'for adjusting the flow rate of the fire extinguishing agent are provided according to each fire extinguishing section 6.

Then, the container valve 12 of the fire extinguishing agent storage container 11
As shown in FIG. 4, it is preferable to use a pressure control valve that regulates the gas pressure P2 of the gas fire extinguishing agent on the discharge side of the container valve 12 by the gas pressure P1 of the constant pressure gas source. This suppression valve is provided with three guide members 2 provided in the flow path 21 of the fire extinguishing agent.
2a, a spring 23 for urging the flow passage valve 22 in a direction to close the fire extinguishing agent flow passage 21, and a nitrogen gas as a constant pressure gas source (for example, at 35 ° C., 1.
08 × 10 ⁷ Pa) and a piston disposed in a cylinder 25 having one end connected to the gas supply port 24 and the other end connected to the discharge side of the fire extinguishing agent flow path 21. 26, an operating rod 27 formed at an end of a piston 26 for operating the flow path valve 22 in a direction to open the flow path 21 of the fire extinguishing agent, and a spring for urging the piston 26 in a direction opposite to the flow path valve 22 28.

In this pressure control valve, a gas supply port 24 is provided from a constant pressure gas container (not shown) as a constant pressure gas source separately provided.
By supplying a gas having a gas pressure P1 (1.08 × 10 ⁷ ) to the piston, the piston 26 is moved against the urging force of the spring 28 and the operation valve 27 formed at the end of the piston 26 causes the flow path valve to move. 22 is operated against the urging force of the spring 23 to open the flow path 21 of the fire extinguishing agent. When the flow path 21 for the fire extinguishing agent is opened, the fire extinguishing agent flows into the flow path 21 from the fire extinguishing agent storage container 11, and the gas pressure P 2 of the fire extinguishing agent in the fire extinguishing agent storage container 1 reaches the other end of the piston 26. Acting, the piston 26 moves the operating rod 2
7 moves in a direction to release the operation of the flow path valve 22, whereby the flow path valve 22 also moves in a direction to close the flow path 21 of the fire extinguishing agent under the urging force of the spring 23. However, since the gas pressure P1 of the constant-pressure gas container is acting on one end of the piston 26, the flow path valve 22 does not completely close the flow path 21 of the fire extinguishing agent, and the following equation (1) is used. ,
According to (2), the flow path valve 22 and the piston 26 equilibrate instantaneously, and the outlet side gas pressure P0 uses, for example, a pressure control valve in which the diameter A of the valve seat 23 is 13.5 mm and the diameter B of the piston 26 is 26 mm. In this case, the gas pressure P0 of the fire extinguishing agent on the discharge side of the flow path 21 is maintained at a value slightly lower than the gas pressure P1 of the constant-pressure gas container.

A ² · P ² + B ² · P 0 = A ² · P 0 + B ² · P 1 (1) P 0 = (B ² · P 1 -A ² · P ² ) / (B ² -A ² ) (2) Here, A is the diameter of the valve seat 23 of the flow path valve 22, and B is the diameter of the piston 26.

Since the flow rate of the extinguishing agent from the opening of the fire extinguishing target section is a constant rate, it is desirable that the flow rate of the extinguishing agent additionally discharged is also a fixed rate. By setting the flow rate to be substantially constant, the concentration of the fire extinguishing agent in the fire extinguishing target compartment can be efficiently and stably maintained. In particular, in the case of compressible fire extinguishing agents, the use of a control valve is effective because the flow rate of a normal container valve differs between the start of discharge and the end of discharge.

Referring to FIG. 5, the operation of the pressure control valve will be specifically described. Until the pressure P2 of the gas-based fire extinguishing agent on the discharge side of the container valve 12 falls below the gas pressure P1 of the constant-pressure gas source, the gas pressure P0 of the gas-based fire extinguishing agent on the discharge side of the control valve is changed to the gas pressure of the constant-pressure gas source. Since it has a function to hold the pressure P1,
Even when the pressure P2 of the gas-based fire extinguishing agent in the fire-extinguishing agent storage container 11 decreases due to the release of the gas-based fire extinguishing agent, the gas pressure P0 of the gas-based fire extinguishing agent on the discharge side of the suppression valve is changed to the gas pressure P1 of the constant-pressure gas source.
, The amount of gaseous fire extinguishing agent released can be kept constant. FIG. 5 shows, as comparative examples, the gas pressure P0 'of the gas-based fire extinguishing agent on the discharge side of the container valve and the pressure P2 of the gas-based fire extinguishing agent in the fire-extinguishing agent storage container when a container valve having a pressure reducing function is used. In the case of a container valve having a pressure reducing function, when the pressure P2 'of the gas-based fire extinguishing agent in the fire-extinguishing agent storage container decreases due to the release of the gas-based fire extinguishing agent, the gas system on the discharge side of the container valve Since the gas pressure P0 'of the fire extinguishing agent also decreases in proportion to it, the emission amount of the gaseous fire extinguishing agent decreases (the difference from the case of the pressure suppression valve is indicated by hatching).

Further, the additional extinguishing agent discharge means 10 calculates the outflow of the extinguishing agent based on the density difference between the mixture of the extinguishing agent and air in the extinguishing target compartment 6 and the air outside the extinguishing target compartment 6. The amount of the fire extinguishing agent additionally discharged is set based on the calculated outflow amount. In this case, the amount of the fire extinguishing agent to be additionally discharged is theoretically calculated, and if necessary, the additional discharging means 10 is provided with a fire extinguishing agent concentration detecting means (illustrated in the drawing) for detecting the concentration of the fire extinguishing agent in the fire extinguishing target section 6. Omitted)
And calculating means (not shown) for calculating the amount of fire extinguishing agent flowing out based on the output signal of the fire extinguishing agent concentration detecting means, and adjusting the opening of the container valve 12 and the like based on the calculating means. Accordingly, the concentration of the fire extinguishing agent in the fire extinguishing target section 6 can be accurately maintained at a level higher than the flame-extinguishing concentration.

In the gas fire extinguishing system of this embodiment, after the fire extinguishing agent of the initial release having a flame-extinguishing concentration or more is discharged into the fire extinguishing target compartment 6, the extinguishing agent is added into the fire extinguishing target compartment 6 by the additional discharge means 10. The fire extinguishing agent that has been released and additionally discharged can continuously compensate for the fire extinguishing agent that decreases due to the outflow from the opening 8, so that the concentration of the fire extinguishing agent in the fire extinguishing target compartment is maintained at a level equal to or higher than the flame-extinguishing concentration for a predetermined time. be able to. Thus, regardless of the type of the extinguishing agent gas, and also in the case of the compressed gas, the concentration of the extinguishing agent is maintained above the extinction concentration for a long period of time. Can be performed reliably.

FIG. 6 shows a fire extinguishing section 6 in this embodiment.
7 is a graph showing the relationship between the oxygen concentration and time for the gas fire extinguishing system of the present embodiment. It was confirmed that it was possible.

Next, FIG. 2 shows a second embodiment of the gas fire extinguishing system of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the gas fire extinguishing system of this embodiment, the nozzle 17 for additional discharge is arranged near the opening 8 of the fire extinguishing target section 6 so that the additionally discharged fire extinguishing agent is mixed with the inflowing air.

As described above, by mixing the extinguishing agent additionally discharged into the inflowing air, partial replacement of the air and the extinguishing agent due to the nozzle position is prevented, and the uniform concentration of the extinguishing agent in the fire extinguishing target compartment is prevented. Can be maintained.

Next, FIG. 3 shows a third embodiment of the gas fire extinguishing system of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the gas fire extinguishing system of this embodiment, a nozzle 18 for additional discharge is disposed near the opening 8 of the fire extinguishing target section 6 over the entire length thereof, and the fire extinguishing agent discharged from the nozzle 18 causes the fire extinguishing agent to discharge from the opening 8. An air curtain for preventing inflow of air is formed.

As described above, the formation of the air curtain by the additional discharge nozzle 18 prevents the inflow of air into the fire extinguishing target compartment and increases the concentration of the fire extinguishing agent in the fire extinguishing target compartment for a longer time. Can be maintained accurately.

[0040]

According to the gas fire extinguishing system of the present invention, after the fire extinguishing agent of the initial release having a flame-extinguishing concentration or more is released into the fire extinguishing target compartment, the extinguishing agent is added to the fire extinguishing target compartment by the additional discharge means. Fired, and by this additional fire extinguishing agent,
Since the fire extinguishing agent, which decreases due to the outflow from the opening, can be continuously compensated for, the concentration of the fire extinguishing agent in the fire extinguisher compartment over the fire extinguishing concentration can be maintained for a long time even in facilities that cannot be closed or have openings that are difficult to close. Therefore, regardless of the type of the extinguishing agent gas, it is possible to surely extinguish a fire even in a fire extinguishing section that cannot be closed or has an opening that is difficult to close.

Further, the flow rate of the extinguishing agent is calculated based on the density difference between the gas mixture of the fire extinguishing agent and air in the fire extinguishing target compartment and the air outside the fire extinguishing target compartment. By setting the amount of the fire extinguishing agent, the concentration of the fire extinguishing agent in the fire extinguishing target compartment can be reliably maintained at a level higher than the extinction concentration.

The suppression valve is used as a container valve for additional discharge, and the flow rate of the additional discharge fire extinguishing agent is set to be substantially constant. A fire extinguishing agent is supplied, so that the concentration of the fire extinguishing agent in the fire extinguishing target compartment can be efficiently and stably maintained.

Further, a nozzle for additional discharge is arranged near the opening of the fire extinguishing target section, and the additionally discharged fire extinguisher is mixed with the inflowing air, so that the air and the fire extinguishing agent caused by the nozzle position are partially removed. Displacement can be prevented and a uniform concentration of the fire extinguishing agent in the fire extinguishing target compartment can be maintained.

Further, an additional discharge nozzle is disposed near the opening of the fire extinguishing section and an air curtain is formed to prevent air from flowing through the opening, thereby preventing air from flowing into the fire extinguishing section. Thus, the concentration of the fire extinguishing agent in the fire extinguishing target compartment can be more accurately maintained for a longer time.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of a gas fire extinguishing system of the present invention.

FIG. 2 is a conceptual diagram showing a second embodiment of the gas fire extinguishing system of the present invention.

FIG. 3 is a conceptual diagram showing a third embodiment of the gas fire extinguishing system of the present invention.

4A and 4B show an example of a pressure control valve, and FIG.
(B) is a top view of a flow-path valve, (c) is the same longitudinal cross-sectional view.

FIG. 5 is an explanatory diagram of an operation of a pressure control valve.

FIG. 6 is a graph showing a relationship between oxygen concentration and time in a fire extinguishing target section when fire extinguishing agent is additionally released.

FIG. 7 is a graph showing the relationship between oxygen concentration and time in a fire extinguishing target section when no additional release of a fire extinguishing agent is performed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fire extinguisher storage container 2 container valve 5, 5 ′ main pipe 6 fire extinguisher compartment 7, 7 ′ selection valve 8 opening 9 nozzle 10 additional discharge means 11 additional fire extinguisher storage container 12 container valve (suppression valve) 15 check valve 16 , 16 'Selection valve 17 Additional discharge nozzle 18 Additional discharge nozzle

Claims (5)

[Claims] 1. A gas extinguished by discharging a gas fire extinguishing agent stored in a fire extinguishing agent storage container into a fire extinguishing target compartment and making the concentration of the fire extinguishing agent in the fire extinguishing target compartment equal to or higher than the flame-extinguishing concentration. In a system fire extinguishing system, after a predetermined amount of fire extinguishing agent that makes the fire extinguishing agent concentration in the fire extinguishing compartment equal to or higher than the flame-extinguishing concentration is released, the fire extinguishing agent that decreases due to the flow out from the opening of the fire extinguishing compartment is continuously discharged. A gas-based fire extinguishing facility, characterized in that a supplementary fire extinguishing agent discharge means is provided to maintain the concentration of a fire extinguishing agent in a fire extinguishing target section at or above a flame-extinguishing concentration for a predetermined time. 2. A flow rate of a fire extinguishing agent is calculated based on a density difference between a gas mixture of a fire extinguishing agent and air in the fire extinguishing target compartment and air outside the fire extinguishing target compartment, and additional discharge of the fire extinguishing agent is performed based on the calculated flow out amount. The gas fire extinguishing system according to claim 1, wherein the amount of the fire extinguishing agent is set. 3. A gas fire extinguishing system according to claim 1, wherein a pressure suppression valve is used as a container valve for additional discharge, and the flow rate of the fire extinguishing agent for additional discharge is substantially constant. 4. The fire extinguishing agent according to claim 1, wherein a nozzle for additional discharge is disposed near an opening of the fire extinguishing section, and the additionally discharged fire extinguishing agent is mixed with the inflowing air. Gas fire extinguishing equipment. 5. A nozzle for additional discharge is disposed near an opening of a fire extinguishing section, and the nozzle forms an air curtain for preventing air from flowing through the opening. 3. The gas fire extinguishing system according to 3 or 4.