JP4319605B2 - Release method of inert gas fire extinguishing agent in inert gas fire extinguishing equipment - Google Patents

Description

  The present invention relates to a method for releasing an inert gas fire extinguishing agent in an inert gas fire extinguishing facility, and in particular, discharges an inert gas fire extinguishing agent stored in a gas state in a fire extinguishing agent storage container into the fire extinguishing compartment, and the fire extinguishing compartment It is related with the discharge | release method of the inert gas fire extinguisher in the inert gas fire extinguishing equipment which extinguishes by maintaining the density | concentration of an inert gas fire extinguisher in the flame extinction density | concentration or more.

  Conventionally, as an inert gas fire extinguishing equipment that has been designed to extinguish by releasing an inert gas fire extinguisher into the fire extinguishing compartment and maintaining the concentration of the inert gas extinguishing agent within the fire extinguishing compartment above the extinguishing concentration, Those using an inert gas such as carbon dioxide or halon gas are widely used.

  By the way, inert gases such as carbon dioxide and halon gas used as inert gas fire extinguishing agents are stored in fire extinguishing equipment in a state where the gas is liquefied and filled in a fire extinguisher storage container consisting of a high pressure gas container. In the event of a fire, use an appropriate electrical or pneumatic means to open the container valve of the fire extinguisher storage container, so that carbon dioxide or halon gas is ejected from the fire extinguisher storage container through the piping. And is discharged from the ejection head into the fire extinguishing section. At this time, an inert gas such as carbon dioxide or 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 section, and fills the fire extinguishing section. To suppress the fire.

  And these inert gas fire extinguishing equipment using inert gas such as carbon dioxide and halon gas can quickly suppress the fire, there is almost no pollution in the fire extinguishing section by the fire extinguishing agent, and the 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 a fire extinguisher whose structure is complex, and there is no secular change of the extinguishing agent and has a constant extinguishing capability 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, and it was actually used. I can no longer do it.

Moreover, it is known that the fire extinguishing equipment using carbon dioxide as a fire extinguishing agent has the following problems.
(1) The design concentration of carbon dioxide in the fire extinguishing section at the time of fire extinguishing is about 35%, and if there is a person in the fire extinguishing section at this concentration, due to the toxicity (anesthetic property) of carbon dioxide There is a risk of situations involving human lives.
(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 released from the ejection head into the fire extinguishing section. In order to remove heat, the saturated vapor pressure of indoor air decreases, moisture in the air condenses, 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 compartment stays in the lower part of the fire extinguishing compartment and the fire extinguishing effect is reduced. Easy to dissipate from the outside.
(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 problems of the conventional inert gas fire extinguishing equipment, the applicant of the present invention is a perfluoroalkane (perfluorobutane (C4F10)) that does not destroy the ozone layer first by nitrogen gas or nitrogen gas. , Hydrogenofluoroalkane (trifluoromethane (CHF3), heptafluoropropane (C3HF7) or pentafluoroethane (C2HF5)) or hydrogenofluorohalogenoalkane (iodotrifluoromethane (CF3I)) (hereinafter collectively referred to as these) Proposed fire extinguishing equipment using a mixed gas (hereinafter simply referred to as “mixed gas”) in which at least one kind of “fluorine compound”) is mixed at a ratio of 10% by volume or less as a fire extinguishing agent (Patent Document 1 and 2).

However, it has been found that there are the following problems when nitrogen gas or a mixed gas is used as a fire extinguisher in an inert gas fire extinguishing facility.
(1) Nitrogen gas or mixed gas as a fire extinguisher for inert gas fire extinguishing equipment uses carbon dioxide that has been pressurized and stored in a gaseous state, so carbon dioxide that is stored in a pressurized state is used Compared to halon gas, the number of extinguishing agent storage containers required for extinguishing the fire extinguishing section of the same volume is required several times, and a large installation space for the extinguishing agent storage container is required.
(2) In order to reduce the number of extinguishing agent storage containers to be installed, it is necessary to increase the filling pressure of the inert gas extinguishing agent filled in the extinguishing agent storage container. and if the selection valve, the main pipe, the branch pipe, also becomes the high gas pressure of the inert gas fire extinguishing agent according to the secondary device of fire extinguishing equipment, such as injection head, Thus, the withstand voltage value of the secondary-side instrument (Pressure-resistant grade) needs to be raised, and the equipment cost becomes remarkably high, and it cannot be applied to existing equipment.

  In response to this problem, the applicant of the present invention has no problem in the secondary equipment of the fire extinguishing equipment even when nitrogen gas or mixed gas is used as a fire extinguishing agent for the inert gas fire extinguishing equipment and the filling pressure is increased to fill the fire extinguisher storage container. The inert gas fire extinguishing equipment which does not apply the high gas pressure of an active gas fire extinguisher was proposed (refer patent document 3).

However, this inactive gas fire extinguishing equipment was found to have the following problems.
(1) In an inert gas fire extinguisher, an inert gas fire extinguisher is discharged within a set release time (for example, within 1 minute) within a predetermined amount of inert gas fire extinguisher (for example, stored in a storage container). 90% or more of the active gas extinguishing agent) must be released, but in the case of the invention described in Patent Document 3, the emission amount of the inert gas extinguishing agent fluctuates greatly within the set release time. Inactive gas fire extinguishing as the pressure of the inert gas fire extinguisher on the fire extinguisher storage container side decreases while 1/2 of the set release time of the inert gas fire extinguisher has not elapsed since the start of the release of the active gas fire extinguisher The discharge amount of the agent is reduced, and the capacity of the fire extinguishing agent distribution path of the inert gas fire extinguishing equipment is not fully utilized.
(2) Since a large amount of inert gas fire extinguishant is released in a short time from the start of discharge of the inert gas fire extinguisher, there is no pressure relief damper provided to prevent an increase in internal pressure in the fire extinguishing section. It is necessary to increase the capacity (opening area).

JP-A-8-141102 JP-A-8-243186 JP-A-8-299492

In view of the problems of the above-described conventional inert gas fire extinguishing equipment, the present invention provides a capacity of a fire extinguishing agent distribution path of an inert gas fire extinguishing equipment and a pressure avoidance damper provided to prevent an increase in internal pressure in the fire extinguishing section. It is an object of the present invention to provide a method for releasing an inert gas fire extinguishing agent in an inert gas fire extinguishing facility that makes it possible to effectively use the capacity and reduce the construction cost of the inert gas fire extinguishing facility. .

  In order to achieve the above object, the inert gas fire extinguishing agent release method in the inert gas fire extinguishing equipment of the present invention releases the inert gas fire extinguishing agent stored in the fire extinguisher storage container in the fire extinguishing section. In a method for discharging an inert gas fire extinguishing agent in an inert gas fire extinguishing facility that extinguishes fire by maintaining the concentration of the inert gas fire extinguishing agent in the fire extinguishing section to be equal to or higher than the flame extinguishing concentration, By setting the flow rate variable valve at an appropriate position in the flow path of the extinguishing agent to control the flow rate of the inert gas extinguishing agent, the set release of the inert gas extinguishing agent from the start of the inert gas extinguishing agent release The discharge amount of the inert gas fire extinguishing agent is kept substantially constant until at least half of the time has elapsed.

  In this case, the discharge amount of the inert gas fire extinguisher can be kept substantially constant until at least 2/3 of the set release time of the inert gas fire extinguisher elapses.

  Moreover, 90% or more of the inert gas fire extinguisher stored in the fire extinguisher storage container can be released within the set release time of the inert gas fire extinguisher.

In addition, the flow rate variable valve reduces the pressure of the inert gas extinguisher downstream of the flow rate variable valve, and the pressure resistance value required by the secondary side device downstream of the flow rate variable valve is increased to the upstream side. Can be made lower than the required withstand voltage value .

According to the inert gas fire extinguishing agent discharge method in the inert gas fire extinguishing facility of the present invention, the flow rate variable valve is disposed at an appropriate position in the fire extinguishing agent flow path from the fire extinguisher storage container to the fire extinguisher jet head. By controlling the flow rate of the gas extinguishing agent, the inert gas extinguishing agent is discharged from the start of the discharge of the inert gas extinguishing agent until at least half of the set release time of the inert gas extinguishing agent elapses. Since the amount is kept substantially constant, the inert gas fire extinguishing agent storage container side inert gas has not passed since 1/2 of the set release time of the inert gas fire extinguishing agent has not elapsed since the start of the release of the inert gas fire extinguishing agent. As the gas extinguishing agent pressure decreases, the amount of inert gas extinguishing agent discharge does not decrease, the capacity of the inert gas extinguishing equipment can be fully utilized, and the inert gas extinguishing agent Large in a short time from the start of release Because of the inert gas fire extinguishing agent is not released, it is not necessary to increase the capacity (opening area) of 避圧 damper is provided to prevent an increase in the internal pressure of extinguishing compartment.
Thus, the inert gas fire extinguishing agent discharge method in the inert gas fire extinguishing equipment of the present invention is provided to prevent the increase in the capacity of the fire extinguishing agent flow path of the inert gas fire extinguishing equipment and the internal pressure in the fire extinguishing section. Since the capacity of the pressure damper can be used effectively, it is not necessary to increase the capacity of the inert gas fire extinguishing facility more than necessary, and the construction cost of the inert gas fire extinguishing facility can be reduced.

  In addition, the inert gas fire extinguishing system is configured so that the discharge amount of the inert gas fire extinguishing agent is kept substantially constant until at least 2/3 of the set release time of the inert gas fire extinguishing agent has elapsed. The capacity of the fire extinguishing agent distribution path and the capacity of the pressure avoidance damper provided to prevent the increase of the internal pressure in the fire extinguishing section can be used more effectively.

  In addition, by discharging 90% or more of the inert gas extinguishing agent stored in the extinguishing agent storage container within the set release time of the inert gas extinguishing agent, it is stored in the extinguishing agent storage container. The inert gas fire extinguishing agent which can be used effectively.

In addition, the flow rate variable valve reduces the pressure of the inert gas extinguisher downstream of the flow rate variable valve, and the pressure resistance value required by the secondary side device downstream of the flow rate variable valve is increased to the upstream side. By lowering the pressure resistance value required by the fire extinguishing equipment, it is not necessary to increase the pressure resistance value of the secondary equipment of the fire extinguishing equipment as much as the pressure resistance value required by the upstream equipment, thereby reducing the equipment cost. Can do.

  Hereinafter, an embodiment of a method for releasing an inert gas fire extinguishing agent in an inert gas fire extinguishing facility of the present invention will be described with reference to the drawings.

  FIG. 1 to FIG. 11 show an embodiment of an inert gas fire extinguishing facility for carrying out the method for discharging an inert gas fire extinguishing agent in the inert gas fire extinguishing facility of the present invention.

  This inert gas fire extinguishing equipment has a plurality of, for example, two fire extinguishing sections 6-1 and 6-2, and, for example, nitrogen gas is used as an inert gas fire extinguishing agent, and this is pressurized to a high pressure gas container. It is used as a fire extinguishing agent storage container 1 by storing it in a fire extinguishing facility in a state filled with (18 MPa at 35 ° C.). The inert gas fire extinguishing equipment of this embodiment is provided with three extinguishing agent storage containers 1, and each extinguishing agent storage container 1 is connected to a connecting pipe 3 via a container valve 2, and further connected to the connecting pipe 3. It connects to the one collecting pipe 4, and this collecting pipe 4 is connected to main piping 5-1, 5-2 extended to each fire extinguishing division 6-1, 6-2. Selection valves 9-1 and 9-2 are disposed in the main pipes 5-1 and 5-2 so that an inert gas fire extinguisher is selectively sent to the fire extinguishing sections 6-1 and 6-2. Main pipes 5-1 and 5-2 extending to the fire extinguishing sections 6-1 and 6-2 are connected to branch pipes 7-1 and 7-2 respectively disposed in the fire extinguishing sections 6-1 and 6-2. Then, the branch pipes 7-1 and 7-2 are connected to ejection heads 8-1 and 8-2, which are disposed at appropriate positions in the fire extinguishing sections 6-1 and 6-2.

By the way, since each fire extinguishing section 6-1 and 6-2 usually differ in the volume, naturally the quantity of the inert gas fire extinguishing agent required for extinguishing fire also differs. For this reason, the diameters of the main pipes 5-1 and 5-2 are changed according to the volumes of the fire extinguishing sections 6-1 and 6-2, and the fire extinguishing sections 6-1 and 6-6 to be extinguished in the event of a fire. The inert gas fire extinguishing equipment is configured so that the number of fire extinguishing agent storage containers 1 corresponding to 2 is opened (see Patent Document 3).
In the figure, 10-1 and 10-2 are selection valve opening devices, 11-1 and 11-2 are start-up gas containers, 12-1 and 12-2 are start-up gas container opening solenoids, 13- Reference numerals 1 and 13-2 denote start-up gas pipelines for controlling the selection valves 9-1 and 9-2 and the opening of a constant-pressure gas container 15 as a constant-pressure gas source, which will be described later. 2 and the non-return valves 14-1 and 14-2 are arranged at appropriate positions in the middle of the connection. The numbers 1 and 2 at the end of these members correspond to the numbers 1 and 2 at the end of the fire extinguishing section, respectively.

In this case, the container valve 2 restricts the gas pressure P of the inert gas extinguishing agent on the discharge side of the container valve 2 to a reference gas pressure P0 or less defined by the gas pressure P1 of the constant pressure gas source, as shown in FIG. It is desirable to use a pressure control valve.
The pressure control valve 2 includes a flow path valve 22 having three guide members 22a provided in the flow path 21 of the inert gas extinguishing agent, and a flow path valve 22 in a direction to close the flow path 21 of the inert gas fire extinguishing agent. And a constant pressure gas source (in this embodiment, a constant pressure gas container 15 filled with nitrogen gas (11 MPa at 35 ° C.) is used as the constant pressure gas source). A gas supply port 24, a piston 26 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 flow path 21 of the inert gas extinguishing agent, and an inert gas extinguishing agent An operation rod 27 formed at the end of a piston 26 that operates the flow path valve 22 in the direction of opening the flow path 21 and a spring 28 that biases the piston 26 in the opposite direction to the flow path valve 22 It is.

Next, the operation of the pressure control valve 2 will be described.
Gas pressure P1 (11 MPa) from a constant pressure gas container 15 as a constant pressure gas source to the gas supply port 24
The piston 26 is moved against the biasing force of the spring 28 by supplying the gas, and the flow path valve 22 is operated against the biasing force of the spring 23 by the operation rod 27 formed at the end of the piston 26. Then, the flow path 21 of the inert gas extinguishing agent is opened. When the inert gas extinguishing agent flow path 21 is opened, the inert gas extinguishing agent flows into the flow path 21 from the extinguishing agent storage container 1, and the gas pressure of the inert gas extinguishing agent in the extinguishing agent storage container 1. P2 (18 MPa at 35 ° C.) acts on the other end side of the piston 26, and the piston 26 moves in a direction to release the operation of the flow path valve 22 by the operating rod 27, whereby the flow path valve 22 is also a spring. In response to the urging force of 23, the inert gas extinguishing agent passage 21 is moved in the closing direction. However, since the gas pressure P1 (11 MPa) of the constant pressure gas container 15 acts on one end side of the piston 26, the flow path valve 22 does not completely close the flow path 21 of the inert gas extinguishing agent. The flow path valve 22 and the piston 26 and the operating rod 27 are instantaneously balanced, and in this embodiment, the gas pressure P of the inert gas extinguisher on the discharge side of the flow path 21 is the gas pressure of the constant pressure gas container 15. It is held at a value equal to P1 (11 MPa).
In this case, the gas pressure P of the discharge-side inert gas extinguisher held by the pressure control valve 2, that is, the reference gas pressure P 0, adjusts the gas pressure itself of the constant pressure gas source, that is, the constant pressure gas container 15. A pressure regulator is provided in the constant pressure gas container 15, the gas pressure P 1 is adjusted by this pressure regulator, springs having different spring constants are used for the springs 23 and 28, and the upper and lower diameters of the piston 26. However, by designing the reference gas pressure P0 so as to match the gas pressure P1 of the constant pressure gas source, it is possible to easily design the inert gas fire extinguishing equipment. it can.
The pressure control valve 2 stops the supply of gas from the constant pressure gas source to the supply port 24 and discharges the gas in the cylinder 25 above the piston 26 to thereby provide a flow path 21 for the inert gas extinguishing agent. The fire extinguisher storage container which has been opened once can be configured to be closed by utilizing this function.

  As shown in FIG. 3, the pressure control valve 2 includes an inert gas on the discharge side of the pressure control valve until the pressure P2 of the inert gas fire extinguisher in the fire extinguisher storage container 1 drops below the reference gas pressure P0. Since it has a function of maintaining the gas pressure P of the extinguishing agent at the reference gas pressure P0, even when the pressure P2 of the inert gas extinguishing agent in the extinguishing agent storage container decreases due to the release of the inert gas extinguishing agent, By maintaining the gas pressure P of the inert gas extinguishing agent on the discharge side of the pressure control valve at the reference gas pressure P0, the discharge amount of the inert gas extinguishing agent can be kept constant. In addition, in FIG. 3, as a comparative example, the gas pressure P ′ of the inert gas extinguishing agent on the discharge side of the container valve when the container valve having a pressure reducing function is used, and the inert gas extinguishing agent in the extinguishing agent storage container. In the case of a container valve having a pressure reducing function, when the pressure P2 ′ of the inert gas extinguisher in the extinguishing agent storage container decreases due to the release of the inert gas extinguishing agent, the container valve is released. Since the gas pressure P ′ of the inert gas extinguisher on the side also decreases in proportion thereto, the discharge amount of the inert gas extinguisher decreases (the difference from the case of the pressure control valve is indicated by the hatched portion). In order to release a predetermined amount of the inert gas fire extinguisher within the set release time t0, the inner diameter of the pipe is increased or the degree of decompression is reduced (the inert gas fire extinguishing agent on the discharge side of the original container valve is reduced). It is necessary to increase the gas pressure P ′). Cormorants there is a problem.

  On the other hand, although the pressure control valve 2 has the above-mentioned advantages, the discharge amount of the inert gas fire extinguisher greatly fluctuates within the set release time, specifically, the inert gas fire extinguisher from the start of the discharge of the inert gas fire extinguisher. The release amount of the inert gas fire extinguisher decreases with a decrease in the pressure P2 of the inert gas fire extinguisher in the fire extinguisher storage container 1 while ½ of the set release time (for example, 1 minute) does not elapse. Therefore, a large amount of inert gas extinguishing agent is released in a short time from the start of releasing the inert gas extinguishing agent, and the problem that the capacity of the extinguishing agent distribution path of the inert gas extinguishing equipment is not fully utilized Therefore, there is a problem in that it is necessary to increase the capacity (opening area) of the pressure avoidance damper 16 provided to prevent the internal pressure in the fire extinguishing sections 6-1 and 6-2 from increasing.

Therefore, in this embodiment, an appropriate position of the fire extinguishing agent flow path from the fire extinguishing agent storage container 1 to the fire extinguishing agent jet head 8, in this embodiment, the collecting pipe on the upstream side of the selection valves 9-1 and 9-2. 4 is provided with a flow rate variable valve 17 to control the flow rate of the inert gas extinguishing agent, so that at least 1/2 of the set release time of the inert gas extinguishing agent from the start of the inert gas extinguishing agent discharge, More preferably, the discharge amount of the inert gas extinguishing agent is kept substantially constant until 2/3 has elapsed.

  In this case, the inert gas extinguishing agent stored in the extinguishing agent storage container 1 is stored in the extinguishing agent storage container 1 within the set release time of the inert gas extinguishing agent so that the inert gas extinguishing agent can be used effectively. It is desirable to release more than 90% of the inert gas fire extinguishing agent being used.

  The flow variable valve 17 has a function of maintaining the discharge amount of the inert gas extinguishing agent substantially constant regardless of the fluctuation (decrease) in the gas pressure Pin of the inert gas extinguishing agent on the introduction side of the flow variable valve 17. As long as the structure is not particularly limited, various flow rate variable valves as shown in FIGS. 4 to 8 can be used.

FIG. 4 shows a first embodiment of the variable flow valve 17.
The flow rate variable valve 17 is configured such that a flow path valve 171a disposed in a flow path of an inert gas fire extinguishing agent is replaced with a gas pressure Pin (hereinafter referred to as “inactive gas fire extinguishing agent gas pressure Pin” applied to one end side 171b of the flow path valve 171a. "Introduction-side gas pressure Pin"), gas pressure Pout of the discharge-side inert gas extinguishing agent applied to the intermediate portion 171c of the flow path valve 171a (hereinafter referred to as "discharge-side gas pressure Pout"), and flow By operating in balance with the initial introduction side gas pressure Pin0 introduced into the gas pressure chamber 171g via the conduit 171e formed in the flow path valve 171a applied to the other end side 171d of the passage valve 171a and the non-circular valve 171f, The cross-sectional area of the gas flow path opening 171h is changed so that the discharge amount of the inert gas extinguishing agent is kept substantially constant regardless of the fluctuation of the introduction side gas pressure Pin.
The flow rate variable valve 17 moves in a direction in which the cross-sectional area of the gas flow path opening 171h decreases due to the introduction side gas pressure Pin being applied to the flow path valve 171a, and then the introduction side gas pressure Pin decreases. The initial introduction side gas pressure Pin0 applied to the flow path valve 171a is configured to move in the direction in which the cross-sectional area of the gas flow path opening 171h increases.
In addition, it can replace with the initial introduction side gas pressure Pin0, and can also comprise so that equivalent constant pressure gas may be introduce | transduced from the constant pressure gas source (illustration omitted) arrange | positioned outside.

FIG. 5 shows a second embodiment of the flow rate variable valve 17.
The flow rate variable valve 17 includes a flow path valve 172a disposed in the flow path of the inert gas extinguishing agent, an introduction side gas pressure Pin applied to the flow path valve 172a, a discharge side gas pressure Pout, and a flow path valve 172a. The introduction side gas pressure Pout introduced into the gas pressure chamber 172c through the conduit 172b formed in the flow path valve 172a applied to the one end side 171e, and the outer periphery of the flow path valve 172a for biasing the flow path valve 172a toward one end side thereof The cross-sectional area of the gas flow passage opening 172f is changed by operating the balance with the biasing force of the spring 172d disposed in the valve 172d, and the discharge amount of the inert gas extinguishing agent is reduced regardless of the fluctuation of the introduction side gas pressure Pin. It is intended to be held substantially constant.
The flow rate variable valve 17 moves in the direction in which the cross-sectional area of the gas flow path opening 172f decreases due to the introduction side gas pressure Pin being applied to the flow path valve 172a, and then the introduction side gas pressure Pin decreases. The 172d is configured to move in a direction in which the cross-sectional area of the gas flow path opening 172f increases by the biasing force of the spring 172d.

FIG. 6 shows a third embodiment of the flow rate variable valve 17.
The flow rate variable valve 17 includes a flow path valve 173a disposed in the flow path of the inert gas extinguisher, an introduction side gas pressure Pin applied to one end side 173b of the flow path valve 173a, and the other end side of the flow path valve 173a. 17
3c, the introduction side gas pressure Pin introduced into the gas pressure chamber 173f via the conduit 173e formed in the main body portion 173d of the flow rate variable valve 17 and the passage valve 173a for biasing the passage valve 173a to the other end side. The cross-sectional area of the gas flow path opening 173h is changed by operating with a balance with the urging force of the spring 173g disposed on the other end side of the gas, and the inert gas extinguishing agent regardless of the fluctuation of the introduction side gas pressure Pin. The amount of release is kept substantially constant.
The flow rate variable valve 17 moves in the direction in which the cross-sectional area of the gas flow path opening 173h decreases due to the introduction side gas pressure Pin being applied to the flow path valve 173a, and then the introduction side gas pressure Pin decreases. The gas passage opening 173h moves in the direction in which the cross-sectional area increases due to the introduction side gas pressure Pin applied to the passage valve 173a.

FIG. 7 shows a fourth embodiment of the flow rate variable valve 17.
The flow rate variable valve 17 includes a flow path valve 174a disposed in the flow path of the inert gas extinguishing agent, and an introduction side gas pressure Pin applied to one end side 173b of the flow path valve 173a and the flow path valve 173a. By operating the flow path valve 174a disposed in the gas pressure chamber 174c formed in communication with the flow path of the inert gas extinguishing agent in accordance with the balance with the biasing force of the spring 174d biased to one end thereof, the gas flow The cross-sectional area of the path opening 174e is changed so that the discharge amount of the inert gas extinguishing agent is kept substantially constant regardless of the variation of the introduction side gas pressure Pin.
The flow rate variable valve 17 is configured such that the introduction side gas pressure Pin is applied to the flow path valve 174a, thereby closing the gas flow path opening 174e at the other end side of the flow path valve 174a and cross-sectional area of the gas flow path opening 174e. When the introduction-side gas pressure Pin decreases after that, the cross-sectional area of the gas flow path opening 174e increases due to the biasing force of the spring 174d. It moves in the direction (FIG. 7 (b) → FIG. 7 (a)).

FIG. 8 shows a fifth embodiment of the flow rate variable valve 17.
This variable flow rate valve 17 includes a flow path valve 175a disposed in the flow path of the inert gas extinguishing agent, an introduction side gas pressure Pin applied to one end side 175b of the flow path valve 175a, and the other end side of the flow path valve 175a. The cross-sectional area of the gas flow path opening 175e is changed by operating the balance by the discharge side gas pressure Pout applied to the gas flow line 175c and the urging force of the sub flow valve 175d disposed in the flow path of the inert gas extinguishing agent. Thus, the discharge amount of the inert gas extinguishing agent is kept substantially constant regardless of the fluctuation of the introduction side gas pressure Pin.
In this case, the sub-flow valve 175d disposed in the flow path of the inert gas extinguishing agent includes an introduction-side gas pressure Pin applied to one end side 175f of the sub-flow path valve 175d and the other end side 175g of the sub-flow path valve 175d. The operation is performed in accordance with a balance with a constant pressure gas pressure Pcon introduced from a constant pressure gas source (not shown) disposed outside.
The flow rate variable valve 17 moves in a direction in which the cross-sectional area of the gas flow path opening 175e decreases due to the introduction side gas pressure Pin being applied to the flow path valve 175a, and then the introduction side gas pressure Pin decreases. The gas passage opening 175e is configured to move in the direction in which the cross-sectional area of the gas passage opening 175e increases via the sub passage valve 175d by the constant pressure gas pressure Pcon.
Instead of the constant pressure gas pressure Pcon, as shown in the fifth embodiment, the initial introduction side gas pressure Pin0 may be introduced.

In addition to the collecting pipe 4 upstream of the selection valves 9-1 and 9-2, as shown in FIG. 9 (a), the variable flow valve 17 is disposed integrally with the injection head 8. As shown in FIG. 9 (b), the main pipe 5 on the downstream side of the selection valve 9 is disposed on the branch pipe 7 on the upstream side of the ejection head 8 as shown in FIG. 9 (c). As shown in FIG. 9 (d), it is arranged in the connecting pipe 3 on the downstream side of the container valve 2, or it is arranged integrally with the container valve 2 as shown in FIG. 9 (e) . The extinguishing agent distribution path from the extinguishing agent storage container 1 to the extinguishing agent ejection heads 8-1 and 8-2 can be set to an arbitrary position.

  In this inert gas fire extinguishing equipment, a flow rate variable valve 17 is disposed at an appropriate position in the fire extinguishing agent flow path from the fire extinguisher storage container 1 to the fire extinguishing agent jet head 8 to control the flow rate of the inert gas extinguishing agent. As shown in FIG. 10, from the start of the release of the inert gas extinguishing agent until at least half of the set release time of the inert gas extinguishing agent elapses (in the embodiment shown in FIG. 10, 4 / The amount of inert gas fire extinguishing agent released is kept substantially constant (here, “substantially constant” includes fluctuations of about ± 20%) until 5 elapses). The extinguishing agent is stored during a period when ½ of the set release time of the inert gas extinguishing agent does not elapse from the start of the release of the inert gas extinguishing agent (in the embodiment shown in FIG. 10, 4/5 does not elapse). As the pressure P2 of the inert gas extinguisher in the container 1 decreases, the inert gas The amount of fire extinguisher is not reduced, the capacity of the inert gas fire extinguishing equipment can be fully utilized, and a large amount of inert gas can be used in a short time from the start of the release of the inert gas fire extinguisher. Since the fire extinguishing agent is not released, it is not necessary to increase the capacity (opening area) of the pressure avoidance damper 16 provided to prevent the internal pressure in the fire extinguishing sections 6-1 and 6-2 from increasing.

Further, in this embodiment, the pressure regulating valve that regulates the gas pressure P of the inert gas extinguishing agent on the discharge side of the container valve 2 to the reference gas pressure P0 or less defined by the gas pressure P1 of the constant pressure gas source. 11 and the flow rate variable valve 17 for controlling the flow rate of the inert gas extinguishing agent at an appropriate position in the extinguishing agent flow path from the extinguishing agent storage container 1 to the extinguishing agent jet head 8, as shown in FIG. In this manner, the gas pressure of the inert gas extinguishing agent downstream of the pressure control valve (container valve 2) and the flow rate variable valve 17 is sequentially reduced, and the secondary pressure downstream of the pressure control valve (container valve 2) and the flow rate variable valve 17 is reduced. Since the pressure resistance required by the side equipment is reduced, it is not necessary to increase the pressure resistance value (pressure resistance grade) of the secondary equipment of the fire extinguishing equipment, and the equipment cost can be reduced. The degree of pressure reduction by the pressure control valve (container valve 2) and the flow rate variable valve 17 is designed comprehensively including the pressure resistance value (pressure resistance grade) of the secondary equipment of the fire extinguishing equipment in the case of a newly installed fire extinguishing equipment. On the other hand, in the case of existing fire extinguishing equipment, the design is made in accordance with the pressure resistance value (pressure resistance grade) of the secondary side equipment of the existing fire extinguishing equipment.
In this embodiment, the example in which the pressure control valve (container valve 2) is used in combination has been described. However, the same effect can be obtained with the flow rate variable valve 17 alone.

  As described above, the method for releasing the inert gas extinguishing agent in the inert gas fire extinguishing facility of the present invention has been described based on the example using the pressure control valve as the container valve. However, the present invention is limited to the configuration described in the above example. However, the configuration can be changed as appropriate without departing from the spirit of the present invention, such as being able to be applied to an inert gas fire extinguishing facility that does not use a pressure control valve by installing a similar variable flow valve. It is something that can be done.

  The inert gas fire extinguishing agent discharge method in the inert gas fire extinguishing equipment of the present invention is provided with a pressure avoidance damper provided to prevent an increase in the capacity of the fire extinguishing agent flow path of the inert gas fire extinguishing equipment and the internal pressure in the fire extinguishing section. Since it has the characteristic that capacity can be used effectively, it can be used suitably for inert gas fire extinguishing equipment, and a flow variable valve is also installed in existing inert gas fire extinguishing equipment. Therefore, it can be easily applied.

It is explanatory drawing which shows one Example of the inert gas fire extinguishing equipment which enforces the discharge | release method of the inert gas fire extinguishing agent in the inert gas fire extinguishing equipment of this invention. An example of the pressure control valve used for an inert gas fire extinguishing equipment is shown, (a) is the whole figure, (b) is a top view of a channel valve, and (c) is the longitudinal section. It is explanatory drawing of an effect | action of a pressure control valve. It is explanatory drawing which shows an example of the flow variable valve used for an inert gas fire extinguishing equipment. It is explanatory drawing which shows an example of the flow variable valve used for an inert gas fire extinguishing equipment. It is explanatory drawing which shows an example of the flow variable valve used for an inert gas fire extinguishing equipment. It is explanatory drawing which shows an example of the flow variable valve used for an inert gas fire extinguishing equipment. It is explanatory drawing which shows an example of the flow variable valve used for an inert gas fire extinguishing equipment. It is explanatory drawing which shows the arrangement | positioning position of a flow variable valve. It is explanatory drawing of an effect | action of a flow variable valve. It is explanatory drawing of an effect | action of a pressure control valve and a flow variable valve.

Explanation of symbols

1 Fire extinguisher storage container 2 Container valve (pressure control valve)
DESCRIPTION OF SYMBOLS 3 Connection pipe 4 Collecting pipe 5 Main piping 6 Fire extinguishing section 7 Branch pipe 8 Injection head 9 Selection valve 10 Selection valve opening device 11 Gas container for starting 12 Solenoid for opening gas container for starting 13 Gas pipe for starting 14 Nonreturn valve 15 Constant Pressure Gas Container 16 Avoidance Damper 17 Flow Variable Valve

Claims (4)

  Discharge the inert gas extinguishing agent stored in the fire extinguisher storage container in a gaseous state into the fire extinguishing compartment and maintain the concentration of the inert gas extinguishing agent in the extinguishing compartment above the extinguishing concentration. In the method of releasing the inert gas extinguishing agent in the active gas fire extinguishing equipment, the flow rate of the inert gas extinguishing agent is controlled by arranging a flow variable valve at an appropriate position in the extinguishing agent flow path from the extinguishing agent storage container to the extinguishing agent jet head. By controlling, the discharge amount of the inert gas extinguishing agent is kept substantially constant from the start of the discharge of the inert gas extinguishing agent until at least half of the set release time of the inert gas extinguishing agent elapses. A method for releasing an inert gas fire extinguishing agent in an inert gas fire extinguishing facility, characterized in that: Until at least 2/3 of the set release time of the inert gas fire extinguishing agent has elapsed, according to claim 1, wherein the amount of emission of the inert gas fire extinguishing agent, characterized in that it has to be held substantially constant non Release method of inert gas fire extinguishing agent in active gas fire extinguishing equipment.   3. The non-active gas fire extinguishing agent according to claim 1, wherein 90% or more of the inert gas fire extinguishing agent stored in the extinguishing agent storage container is released within a set release time of the inert gas extinguishing agent. Release method of inert gas fire extinguishing agent in active gas fire extinguishing equipment. The flow rate variable valve reduces the pressure of the inert gas extinguisher downstream of the flow rate variable valve, and the upstream side of the pressure resistance value required by the secondary device downstream of the flow rate variable valve is required. 4. The method for radiating an inert gas fire extinguishing agent according to claim 1, 2 or 3, wherein the radiation pressure is lower than the pressure resistance value .

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