JP2017185043A

JP2017185043A - Gas fire extinguishing system with non-return valve in the starting gas line

Info

Publication number: JP2017185043A
Application number: JP2016076474A
Authority: JP
Inventors: 康史井上; Yasushi Inoue; 裕策米田; Yusaku Yoneda; 剛敏長谷川; Taketoshi Hasegawa; 三範鴨; Mitsunori Kamo
Original assignee: Koatsu Co Ltd
Current assignee: Koatsu Co Ltd
Priority date: 2016-04-06
Filing date: 2016-04-06
Publication date: 2017-10-12
Anticipated expiration: 2036-04-06
Also published as: JP6685810B2

Abstract

【課題】複数の不還弁を起動用ガス管路に直列状態で介在させた場合でも、各不還弁の位置で起動用ガスの圧力が低下せず、起動用ガス管路の末端の圧力を維持して、容器弁の作動の安定性が確保することができるようにした起動用ガス管路に不還弁を介在させたガス系消火システムを提供すること。【解決手段】起動用ガス管路における起動用ガスの流通方向を制限する不還弁に、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁Ｖ１を用いる。【選択図】図３[Problem] To provide a gas-based fire extinguishing system with non-return valves interposed in a startup gas pipeline, so that even when multiple non-return valves are interposed in series in the startup gas pipeline, the pressure of the startup gas does not drop at the position of each non-return valve, maintaining the pressure at the end of the startup gas pipeline and ensuring stable operation of the container valve. [Solution] The non-return valve that limits the flow direction of the startup gas in the startup gas pipeline uses a non-return valve V1 that does not create a pressure difference between the gas pressure on the primary side and the gas pressure on the secondary side. [Selected drawing] Figure 3

Description

本発明は、起動回路に不還弁を介在させたガス系消火システムに関するものである。 The present invention relates to a gas fire extinguishing system in which a nonreturn valve is interposed in a starting circuit.

従来、消火剤として、ハロン、窒素、二酸化炭素等のガス系消火剤を用いるガス系消火システムにおいて、１つのガス系消火システムを用いて、容積が異なる複数の消火対象区画の消火を行うようにしたものがある（例えば、特許文献１参照。）。 Conventionally, in a gas fire extinguishing system using a gas fire extinguishing agent such as halon, nitrogen, carbon dioxide, etc. as a fire extinguishing agent, one gas fire extinguishing system is used to extinguish a plurality of fire extinguishing target sections having different volumes. (For example, refer to Patent Document 1).

このガス系消火システムは、例えば、図１に示すように、５本の消火剤貯蔵容器１−１、１−２、・・・１−５を備え、各容器１には、容器弁２を介して連結管３を接続し、さらに連結管３を１本の集合管４に接続し、この集合管４を各消火対象区画６−１、６−２、６−３まで延設した主配管５−１、５−２、５−３に接続する。主配管５−１、５−２、５−３には、選択弁９−１、９−２、９−３を配設し、消火対象区画６−１、６−２、６−３に選択的にガス系消火剤を送るようにする。消火対象区画６−１、６−２、６−３まで延設した主配管５−１、５−２、５−３を、消火対象区画６−１、６−２、６−３内にそれぞれ配設した枝管８−１、８−２、８−３に接続し、この枝管８−１、８−２、８−３を消火対象区画６−１、６−２、６−３内の適所に複数個配設した噴射ヘッド７−１、７−２、７−３に接続する。 The gas fire extinguishing system includes, for example, five fire extinguishing agent storage containers 1-1, 1-2,... 1-5 as shown in FIG. The connecting pipe 3 is connected to the main pipe, and the connecting pipe 3 is further connected to one collecting pipe 4, and this collecting pipe 4 is extended to each fire extinguishing target section 6-1, 6-2, 6-3. Connect to 5-1, 5-2, 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. To send a gas fire extinguisher. 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.

この場合、消火対象区画６−１、６−２、６−３は、その容積が異なるため、消火するのに必要となるガス系消火剤の量も異なる。このため、主配管５−１、５−２、５−３の口径を各消火対象区画６−１、６−２、６−３の容積に応じて異ならせるほか、火災発生時に、消火対象となる消火対象区画６−１、６−２、６−３に対応した本数の消火剤貯蔵容器１が開放されるようにガス系消火システムを構成する。 In this case, the fire extinguishing target sections 6-1, 6-2, and 6-3 have different volumes, so that the amounts of gas-based fire extinguishing agents necessary for extinguishing fires are also different. 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 system is configured so that the number of fire extinguishing agent storage containers 1 corresponding to the fire extinguishing target sections 6-1, 6-2 and 6-3 are opened.

ここで、開放すべき消火剤貯蔵容器１の本数を、消火対象区画６−１が５本、消火対象区画６−２が３本、消火対象区画６−３が１本に設定する場合について説明する。
なお、図中、９−１、９−２、９−３は選択弁、１０−１、１０−２、１０−３は選択弁開放装置、１１−１、１１−２、１１−３は起動用ガス容器、１２−１、１２−２、１２−３は起動用ガス容器開放用のソレノイドである。また、図中、１３−１、１３−２、１３−３は、選択弁９−１、９−２、９−３及び起動用ガス容器１１−１、１１−２、１１−３の開放をコントロールする起動用ガス管路で、選択弁開放装置１０−１、１０−２、１０−３に接続され、その途中の適所に不還弁１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂを配設する。なお、不還弁１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂの通過可能方向は、図の矢印の向きで表している。なお、これらの部材の末尾の数字１、２、３は、消火対象区画の末尾の数字１、２、３にそれぞれ対応している。 Here, the case where the number of extinguishing agent storage containers 1 to be opened is set to five for the extinguishing target section 6-1, three for the extinguishing target section 6-2, and one for the extinguishing target section 6-3 will be described. 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.

そして、消火対象区画６−１に火災が発生したとすれば、火災発見者がこの消火対象区画６−１に対応する押釦（手動操作の場合）を操作すると、電気信号が起動用ガス容器開放用のソレノイド１２−１に送られ、ソレノイド１２−１が動作して起動用ガス容器１１−１が開放される。起動用ガス容器１１−１が開放されることにより放出された起動用ガス（起動用ガスのガス圧：周囲温度や管容積にもよるが、概ね１〜１１ＭＰａに設定）は、まず、選択弁開放装置１０−１に導入されて選択弁９−１を開放してから、不還弁１４−１を経て起動用ガス管路１３−１を通り、不還弁１４−Ａ及び不還弁１４−Ｂを通過してすべての容器弁２に至って消火剤貯蔵容器１を５本とも開放する。このとき、不還弁１４−２及び不還弁１４−３を通過することができないため、選択弁９−２及び選択弁９−３は開放されない。そして、開放された５本の消火剤貯蔵容器１から、ガス系消火剤が、容器弁２、連結管３、集合管４、選択弁９−１、主配管５−１及び枝管８−１を介して噴射ヘッド７−１まで送られ、噴射ヘッド７−１から消火対象区画６−１内に放出される。 If a fire occurs in the fire extinguishing target section 6-1 and the fire finder operates the 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 starting gas released by opening the starting gas container 11-1 (the gas pressure of the starting gas: depending on the ambient temperature and the tube volume, which is generally set to 1 to 11 MPa) is selected first. After being introduced into the opening device 10-1 and opening the selection valve 9-1, it passes through the nonreturn valve 14-1 through the starting gas line 13-1, the nonreturn valve 14 -A and the nonreturn valve 14. Pass through -B, reach all container valves 2, and open all five extinguishing agent 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. And from five open fire extinguishing agent storage containers 1, gas type fire extinguishing agents are container valve 2, connecting pipe 3, collecting pipe 4, selection valve 9-1, main piping 5-1, and branch pipe 8-1. And is discharged from the ejection head 7-1 into the fire extinguishing target section 6-1.

また、消火対象区画６−２に火災が発生したとすれば、火災発見者がこの消火対象区画６−２に対応する押釦（手動操作の場合）を操作すると、電気信号が起動用ガス容器開放用のソレノイド１２−２に送られ、ソレノイド１２−２が動作して起動用ガス容器１１−２が開放される。起動用ガス容器１１−２が開放されることにより放出された起動用ガスは、まず、選択弁開放装置１０−２に導入されて選択弁９−２を開放してから、不還弁１４−２を経て起動用ガス管路１３−２を通り、不還弁１４−Ｂを通過して容器弁２に至って消火剤貯蔵容器１を３本だけ、すなわち、消火剤貯蔵容器１−３、１−４、１−５を開放する。このとき、不還弁１４−Ａを通過することができないため、消火剤貯蔵容器１のうち２本、すなわち、消火剤貯蔵容器１−１、１−２は開放されない。また、不還弁１４−１及び不還弁１４−３を通過することができないため、選択弁９−１及び選択弁９−３は開放されない。そして、開放された３本の消火剤貯蔵容器１−３、１−４、１−５から、ガス系消火剤が、容器弁２、連結管３、集合管４、選択弁９−２、主配管５−２及び枝管８−２を介して噴射ヘッド７−２まで送られ、噴射ヘッド７−２から消火対象区画６−２内に放出される。 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 storage containers 1, that is, the extinguishing agent storage containers 1-3, -4, 1-5 are opened. At this time, since it cannot pass through the non-return valve 14-A, two of the extinguishing agent storage containers 1, that is, the extinguishing agent 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. And from 3 open fire extinguisher storage containers 1-3, 1-4, and 1-5, the gas-type fire extinguishing agent is the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-2, the main valve 9-2. It is sent to the ejection head 7-2 via the pipe 5-2 and the branch pipe 8-2, and is discharged from the ejection head 7-2 into the fire extinguishing target section 6-2.

また、消火対象区画６−３に火災が発生したとすれば、火災発見者がこの消火対象区画６−３に対応する押釦（手動操作の場合）を操作すると、電気信号が起動用ガス容器開放用のソレノイド１２−３に送られ、ソレノイド１２−３が動作して起動用ガス容器１１−３が開放される。起動用ガス容器１１−３が開放されることにより放出された起動用ガスは、まず、選択弁開放装置１０−３に導入されて選択弁９−３を開放してから、不還弁１４−３を経て起動用ガス管路１３−３を通り、容器弁２に至って消火剤貯蔵容器１を１本だけ、すなわち、消火剤貯蔵容器１−５を開放する。このとき、不還弁１４−Ｂを通過することができない（したがって、当然、不還弁１４−Ａも通過することができない）ため、消火剤貯蔵容器１のうち４本、すなわち、消火剤貯蔵容器１−１、１−２、１−３、１−４は開放されない。また、不還弁１４−１及び不還弁１４−２を通過することができないため、選択弁９−１及び選択弁９−２は開放されない。そして、開放された１本の消火剤貯蔵容器１−５から、ガス系消火剤が、容器弁２、連結管３、集合管４、選択弁９−３、主配管５−３及び枝管８−３を介して噴射ヘッド７−３まで送られ、噴射ヘッド７−３から消火対象区画６−３内に放出される。 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 storage container 1, that is, the extinguishing agent 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 storage containers 1, that is, the extinguishing agent storage. The 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. And from one opened fire extinguisher storage container 1-5, the gas fire extinguisher is the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-3, the main pipe 5-3 and the branch pipe 8. -3 to the ejection head 7-3 and discharged from the ejection head 7-3 into the fire extinguishing target section 6-3.

ここでは、消火対象区画が３区画で、消火剤貯蔵容器１の本数が５本の場合を例にして説明したが、消火対象区画の数及び消火剤貯蔵容器１の本数並びに開放される消火剤貯蔵容器１の本数は、任意に設定される。 Here, the case where there are three fire extinguishing target sections and the number of fire extinguishing agent storage containers 1 is described as an example, but the number of fire extinguishing target sections, the number of fire extinguishing agent storage containers 1 and the extinguishing agent to be opened are described. The number of the storage containers 1 is arbitrarily set.

特開平８−２９９４９２号公報JP-A-8-299492

ところで、上記従来のガス系消火システムにおいては、起動用ガス管路１３−１、１３−２、１３−３における起動用ガスの流通方向を制限する不還弁１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂに、構造が簡単で、動作の安定性が高い、図２に示すような構造の不還弁Ｖ０を用いるようにしている。 By the way, in the conventional gas fire extinguishing system, the non-return valves 14-1, 14-2, 14 for restricting the flow direction of the starting gas in the starting gas pipelines 13-1, 13-2, 13-3. -3, 14-A and 14-B are configured to use a non-return valve V0 having a simple structure and high operational stability as shown in FIG.

この不還弁Ｖ０は、１次側１４ａと２次側１４ｂとを遮断可能に配設した、シート面１４ｄを備えたピストン１４ｃと、１次側１４ａに向けてピストン１４ｃを付勢するばね１４ｅと、起動用ガスの流路１４ｆ１、１４ｆ２とを備えて構成されている。 The non-return valve V0 includes a piston 14c having a seat surface 14d disposed so as to be able to shut off the primary side 14a and the secondary side 14b, and a spring 14e that biases the piston 14c toward the primary side 14a. And activation gas flow paths 14f1 and 14f2.

次に、この不還弁Ｖ０は、以下のように動作する。
２次側１４ｂから起動用ガスのガス圧がかかったとき、ピストン１４ｃにかかるばね１４ｅの付勢力とガス圧力によってシート面１４ｄが弁座１４ｇに押圧されることで、１次側１４ａと２次側１４ｂとが遮断され、１次側１４ａには起動用ガスは流れない。 Next, the feedback valve V0 operates as follows.
When the gas pressure of the starting gas is applied from the secondary side 14b, the seat surface 14d is pressed against the valve seat 14g by the urging force of the spring 14e applied to the piston 14c and the gas pressure, whereby the primary side 14a and the secondary side The side 14b is cut off, and the starting gas does not flow to the primary side 14a.

一方、１次側１４ａから起動用ガスのガス圧がかかったとき、ガス圧が、ばね１４ｅがピストン１４ｃを付勢する力以上の圧力であれば、ピストン１４ｃが２次側１４ｂに動き、流路１４ｆ１、１４ｆ２を通って２次側１４ｂに起動用ガスが流れる。
ここで、１次側１４ａの起動用ガスのガス圧をＰ１、２次側１４ｂの起動用ガスのガス圧をＰ２、１次側１４ａの起動用ガスのガス圧Ｐ１を受けるピストン１４ｃの受圧面積をＡ１、２次側１４ｂの起動用ガスのガス圧Ｐ２を受けるピストン１４ｃの受圧面積をＡ２、弁座１４ｇの直径をｄ１（面積をＳ１＝π・ｄ１^２／４）、ピストン１４ｃの直径をｄ２（面積をＳ２＝π・ｄ２^２／４）、ばね１４ｅの変位をｘ、ばね定数をｋとする。
ピストン１４ｃに働く力Ｆは、
Ｆ＝Ｐ１・Ａ１−Ｐ２・Ａ２−ｋｘ
となる。
ピストンが動作を開始する条件は、初期状態がＰ２＝０であり、Ａ１＝Ｓ１であるので、この不還弁Ｖ０では、
Ｐ１・Ｓ１−ｋｘ＞０
のときに、ピストン１４ｃが動作を開始する。
ピストン１４ｃが動作を開始してから、２次側１４ｂに起動用ガスが流れ込むことによって、Ｐ２の圧力が上昇していき、
Ｐ１・Ａ１−Ｐ２・Ａ２−ｋｘ＝０
となったときに、ピストン１４ｃの動きが停止し、平衡状態となる。その後Ｐ２の上昇に従って、ピストン１４ｃが移動し、シート面１４ｄが弁座１４ｇに接して、１次側１４ａから２次側１４ｂへの起動用ガスの流れが停止する。
この状態では、Ａ１＝Ａ２＝Ｓ１であるので、
Ｐ１−Ｐ２−ｋｘ／Ｓ１＝０
となり、１次側１４ａの起動用ガスのガス圧Ｐ１と、２次側１４ｂの起動用ガスのガス圧Ｐ２との間に、圧力差ｋｘ／Ｓ１（ただし、Ｐ１＞Ｐ２）が発生する。 On the other hand, when the gas pressure of the starting gas is applied from the primary side 14a, if the gas pressure is equal to or higher than the force by which the spring 14e urges the piston 14c, the piston 14c moves to the secondary side 14b and flows. The starting gas flows through the paths 14f1 and 14f2 to the secondary side 14b.
Here, the pressure pressure area of the piston 14c that receives the gas pressure P1 of the starting gas on the primary side 14a, P2 the gas pressure of the starting gas on the primary side 14b, P2, and the gas pressure P1 of the starting gas on the primary side 14a. the pressure receiving area of the piston 14c which receives the gas pressure P2 of the starting gas A1,2 primary 14b to A2, the diameter of the valve seat 14 g d1 (area of ^{S1 = π · d1 2/4} ), the diameter of the piston 14c d2 (area of ^{S2 = π · d2 2/4} ), the displacement of the spring 14e x, the spring constant and k.
The force F acting on the piston 14c is
F = P1, A1-P2, A2-kx
It becomes.
The conditions for starting the operation of the piston are that the initial state is P2 = 0 and A1 = S1, so in this non-return valve V0,
P1 · S1-kx> 0
At this time, the piston 14c starts operating.
Since the starting gas flows into the secondary side 14b after the piston 14c starts operating, the pressure of P2 increases,
P1, A1-P2, A2-kx = 0
When this happens, the movement of the piston 14c stops, and an equilibrium state is reached. Thereafter, as P2 rises, the piston 14c moves, the seat surface 14d comes into contact with the valve seat 14g, and the flow of the starting gas from the primary side 14a to the secondary side 14b stops.
In this state, A1 = A2 = S1, so
P1-P2-kx / S1 = 0
Thus, a pressure difference kx / S1 (where P1> P2) is generated between the gas pressure P1 of the starting gas on the primary side 14a and the gas pressure P2 of the starting gas on the secondary side 14b.

このように、従来の起動用ガス管路１３−１、１３−２、１３−３における起動用ガスの流通方向を制限する不還弁１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂとして用いられている、不還弁Ｖ０は、構造が簡単で、動作の安定性が高い反面、平衡状態では、１次側１４ａの起動用ガスのガス圧Ｐ１と、２次側１４ｂの起動用ガスのガス圧Ｐ２との間に、圧力差ｋｘ／Ｓ１（ただし、Ｐ１＞Ｐ２）が発生するため、例えば、複数の不還弁Ｖ０を起動用ガス管路に直列状態で介在させた場合、各不還弁Ｖ０の位置で起動用ガスの圧力が低下していき、起動用ガス管路の末端の圧力が低くなり、容器弁２の作動の安定性が確保しにくくなることが考えられる。 Thus, the non-return valves 14-1, 14-2, 14-3, 14-A for restricting the flow direction of the starting gas in the conventional starting gas pipelines 13-1, 13-2, 13-3. The non-return valve V0 used as 14-B has a simple structure and high operational stability, but in equilibrium, the gas pressure P1 of the starting gas on the primary side 14a and the secondary side Since a pressure difference kx / S1 (where P1> P2) occurs between the gas pressure P2 of the starting gas 14b, for example, a plurality of nonreturn valves V0 are interposed in series in the starting gas line In such a case, the pressure of the starting gas decreases at the position of each non-return valve V0, the pressure at the end of the starting gas line becomes low, and it becomes difficult to ensure the stability of the operation of the container valve 2. Can be considered.

本発明は、上記従来の起動用ガス管路に不還弁を介在させたガス系消火システムの有する問題点に鑑み、複数の不還弁を起動用ガス管路に直列状態で介在させた場合でも、各不還弁の位置で起動用ガスの圧力が低下せず、起動用ガス管路の末端の圧力を維持して、容器弁の作動の安定性が確保することができるようにした起動用ガス管路に不還弁を介在させたガス系消火システムを提供することを目的とする。 In view of the problem of the gas fire extinguishing system in which the non-return valve is interposed in the conventional starting gas pipe, the present invention has a case where a plurality of non-return valves are interposed in series in the starting gas pipe. However, the starting gas pressure does not decrease at the position of each non-return valve, and the pressure at the end of the starting gas line is maintained to ensure the stability of the operation of the container valve. An object of the present invention is to provide a gas fire extinguishing system in which a non-return valve is interposed in a gas pipeline.

上記目的を達成するため、本発明の起動用ガス管路に不還弁を介在させたガス系消火システムは、複数の消火剤貯蔵容器の各々に容器弁を配設し、該容器弁を、起動用ガスの流通方向を制限する不還弁を介在させた起動用ガス管路により接続し、火災発生時に、起動用ガス管路に起動用ガスを供給することで、容器弁を選択的に開放して、開放された容器弁に対応する消火剤貯蔵容器に貯蔵されているガス系消火剤を、容器弁及び管路を介して、消火対象区画に供給するようにした、起動用ガス管路に不還弁を介在させたガス系消火システムにおいて、前記不還弁に、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁を用いたことを特徴とする。 In order to achieve the above object, a gas fire extinguishing system in which a non-return valve is interposed in a starting gas line of the present invention is provided with a container valve in each of a plurality of fire extinguishing agent storage containers, Connected by a starter gas line with a nonreturn valve that restricts the flow direction of the starter gas, and in the event of a fire, the starter gas is supplied to the starter gas line to selectively select the container valve. Gas pipe for starting which is opened and gas extinguishing agent stored in the extinguishing agent storage container corresponding to the opened container valve is supplied to the fire extinguishing target section through the container valve and the pipe line In the gas fire extinguishing system in which a non-return valve is interposed in the road, a non-return valve that does not cause a pressure difference between the primary side gas pressure and the secondary side gas pressure is used as the nonreturn valve. And

本発明の起動用ガス管路に不還弁を介在させたガス系消火システムによれば、複数の消火剤貯蔵容器の各々に容器弁を配設し、該容器弁を、起動用ガスの流通方向を制限する不還弁を介在させた起動用ガス管路により接続し、火災発生時に、起動用ガス管路に起動用ガスを供給することで、容器弁を選択的に開放して、開放された容器弁に対応する消火剤貯蔵容器に貯蔵されているガス系消火剤を、容器弁及び管路を介して、消火対象区画に供給するようにした、起動用ガス管路に不還弁を介在させたガス系消火システムにおいて、前記不還弁に、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁を用いることにより、複数の不還弁を起動用ガス管路に直列状態で介在させた場合でも、各不還弁の位置で起動用ガスの圧力が低下せず、起動用ガス管路の末端の圧力を維持して、容器弁の作動の安定性が確保することができる。 According to the gas fire extinguishing system in which a nonreturn valve is interposed in the starting gas pipeline of the present invention, a container valve is disposed in each of a plurality of fire extinguishing agent storage containers, and the container valve is connected to the starting gas flow. Connected by a starting gas line with a non-return valve that restricts the direction, and in the event of a fire, by supplying the starting gas to the starting gas line, the container valve is selectively opened and opened. Non-return valve in the starting gas line that supplies the fire extinguisher stored in the fire extinguisher storage container corresponding to the container valve to the fire extinguishing target section via the container valve and the pipe line In the gas fire extinguishing system in which the non-return valve is used, a non-return valve that does not cause a pressure difference between the primary side gas pressure and the secondary side gas pressure is used as the nonreturn valve. Even when it is inserted in series in the starting gas line, the pressure of the starting gas decreases at the position of each non-return valve Not, to maintain the end pressure of the starting gas conduit, the stability of operation of the container valve can be secured.

起動用ガス管路に不還弁を介在させたガス系消火システムの一例を示す説明図である。It is explanatory drawing which shows an example of the gas fire extinguishing system which interposed the non-return valve in the gas pipeline for starting. 従来の不還弁の説明図である。It is explanatory drawing of the conventional non-return valve. 本発明の起動用ガス管路に不還弁を介在させたガス系消火システムに用いる不還弁の一例を示す説明図である。It is explanatory drawing which shows an example of the non-return valve used for the gas fire extinguishing system which interposed the non-return valve in the gas line for starting of this invention. 本発明の起動用ガス管路に不還弁を介在させたガス系消火システムに用いる不還弁の一例を示す説明図である。It is explanatory drawing which shows an example of the non-return valve used for the gas fire extinguishing system which interposed the non-return valve in the gas line for starting of this invention. 本発明の起動用ガス管路に不還弁を介在させたガス系消火システムに用いる不還弁の一例を示す説明図である。It is explanatory drawing which shows an example of the non-return valve used for the gas fire extinguishing system which interposed the non-return valve in the gas line for starting of this invention. 本発明の起動用ガス管路に不還弁を介在させたガス系消火システムに用いる不還弁の一例を示す説明図である。It is explanatory drawing which shows an example of the non-return valve used for the gas fire extinguishing system which interposed the non-return valve in the gas line for starting of this invention.

以下、本発明の起動用ガス管路に不還弁を介在させたガス系消火システムの実施の形態を、図面に基づいて説明する。 Embodiments of a gas fire extinguishing system in which a nonreturn valve is interposed in a starting gas pipeline according to the present invention will be described below with reference to the drawings.

本発明の起動用ガス管路に不還弁を介在させたガス系消火システムは、図１に示す、ガス系消火システムと同様、消火剤として、ハロン、窒素、二酸化炭素等のガス系消火剤を用いるガス系消火システムにおいて、１つのガス系消火システムを用いて、容積が異なる複数の消火対象区画の消火を行うようにしたもので、複数の消火剤貯蔵容器１−１、１−２、・・・１−５の各々に容器弁２を配設し、この容器弁２を、起動用ガスの流通方向を制限する不還弁１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂを介在させた起動用ガス管路１３−１、１３−２、１３−３により接続し、火災発生時に、起動用ガス管路１３−１、１３−２、１３−３に起動用ガスを供給することで、容器弁２を選択的に開放して、開放された容器弁２に対応する消火剤貯蔵容器１−１、１−２、・・・１−５に貯蔵されているガス系消火剤を、容器弁２及び管路（連結管３、集合管４、主配管５−１、５−２、５−３及び枝管８−１、８−２、８−３）を介して、消火対象区画６−１、６−２、６−３に供給するようにしたものである。 The gas fire extinguishing system in which a nonreturn valve is interposed in the starting gas pipe of the present invention is similar to the gas fire extinguishing system shown in FIG. In a gas-based fire extinguishing system using a single fire extinguishing system, a plurality of fire extinguishing target sections having different volumes are extinguished, and a plurality of extinguishing agent storage containers 1-1, 1-2, .. 1-5 are each provided with a container valve 2, and the container valve 2 is used as a non-return valve 14-1, 14-2, 14-3, 14-A for restricting the flow direction of the starting gas. , 14-B are connected by start-up gas pipelines 13-1, 13-2, 13-3, and are activated to start-up gas pipelines 13-1, 13-2, 13-3 in the event of a fire. By supplying the working gas, the container valve 2 is selectively opened to correspond to the opened container valve 2 The gas-based fire extinguishing agent stored in the extinguishing agent storage containers 1-1, 1-2,... 1-5 is connected to the container valve 2 and the pipe line (connecting pipe 3, collecting pipe 4, main pipe 5-1. 5-2, 5-3 and branch pipes 8-1, 8-2, 8-3) are supplied to the fire extinguishing target sections 6-1, 6-2, 6-3. .

そして、本発明の起動用ガス管路に不還弁を介在させたガス系消火システムにおいては、起動用ガス管路１３−１、１３−２、１３−３における起動用ガスの流通方向を制限する不還弁１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂに、図３〜図５に示す、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁Ｖ１、Ｖ２、Ｖ３、Ｖ４を用いるようにしている。 And in the gas fire extinguishing system in which the nonreturn valve is interposed in the starting gas line of the present invention, the flow direction of the starting gas in the starting gas lines 13-1, 13-2, 13-3 is restricted. To the non-return valves 14-1, 14-2, 14-3, 14-A, 14-B, the pressure difference between the primary side gas pressure and the secondary side gas pressure shown in FIGS. The non-return valves V1, V2, V3, and V4 that do not cause the problem are used.

これにより、本発明の起動用ガス管路に不還弁を介在させたガス系消火システムは、複数の不還弁を起動用ガス管路に直列状態で介在させた場合でも、各不還弁の位置で起動用ガスの圧力が低下せず、起動用ガス管路の末端の圧力を維持して、容器弁の作動の安定性が確保することができる。 As a result, the gas fire extinguishing system in which the nonreturn valve is interposed in the starting gas pipeline of the present invention is configured so that each nonreturn valve is provided even when a plurality of nonreturn valves are interposed in series in the starting gas pipeline. In this position, the pressure of the starting gas does not decrease, and the pressure at the end of the starting gas pipe is maintained, so that the stability of the operation of the container valve can be ensured.

図３に示す、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁Ｖ１は、１次側１４ａと２次側１４ｂとを遮断可能に配設した、シート面１４ｄを備えたピストン１４ｃと、１次側１４ａに向けてピストン１４ｃを付勢するばね１４ｅと、起動用ガスの流路１４ｆと、シール部１４ｈ１、１４ｈ２と、大気連通路１４ｉとを備えて構成されている。また、弁座１４ｇの直径をｄ１（面積をＳ１＝π・ｄ１^２／４）、シール部１４ｈ１、１４ｈ２部分の直径をそれぞれｄ２、ｄ３（面積をＳ２＝π・ｄ２^２／４、Ｓ３＝π・ｄ３^２／４）とする。 The non-return valve V1 shown in FIG. 3 that does not cause a pressure difference between the primary side gas pressure and the secondary side gas pressure is disposed so that the primary side 14a and the secondary side 14b can be shut off. A piston 14c having a surface 14d, a spring 14e for urging the piston 14c toward the primary side 14a, a starting gas flow path 14f, seal portions 14h1, 14h2, and an atmosphere communication path 14i are provided. It is configured. Further, the diameter of the valve seat 14 g d1 (the area ^{S1 = π · d1 2/4} ), the diameter of the sealing portion 14h1,14h2 portions respectively d2, d3 (the area ^{S2 = π · d2 2/4} , S3 = π · ^d3 2/4) to.

次に、この不還弁Ｖ１は、以下のように動作する。ここで、１次側１４ａの起動用ガスのガス圧をＰ１、２次側１４ｂの起動用ガスのガス圧をＰ２、１次側１４ａの起動用ガスのガス圧Ｐ１を受けるピストン１４ｃの受圧面積をＡ１、２次側１４ｂの起動用ガスのガス圧Ｐ２を受けるピストン１４ｃの受圧面積をＡ２、ばね１４ｅの変位をｘ、ばね定数をｋとする。
ピストン１４ｃに働く力Ｆは、
Ｆ＝Ｐ１・Ａ１−Ｐ２・Ａ２−ｋｘ
である。
２次側１４ｂから起動用ガスのガス圧がかかったとき、Ｐ１＝０、Ａ２＝Ｓ１−Ｓ２＋Ｓ３であるから、
Ｆ＝−Ｐ２・（Ｓ１−Ｓ２＋Ｓ３）−ｋｘ＜０
のとき、ピストン１４ｃにかかるばね１４ｅの付勢力とガス圧力によってシート面１４ｄが弁座１４ｇに押圧されることで、１次側１４ａと２次側１４ｂとが遮断され、１次側１４ａには起動用ガスは流れないため、Ｓ１、Ｓ２、Ｓ３、ｋｘは上式を満たすように設計される。特に、圧力とばね力を精密に設定しなくて済むように、Ｓ１−Ｓ２＋Ｓ３＞０となるように機器を設計する（例えば、ｄ１＝８ｍｍ、ｄ２＝１２ｍｍ、ｄ３＝９ｍｍ）。 Next, the feedback valve V1 operates as follows. Here, the pressure pressure area of the piston 14c that receives the gas pressure P1 of the starting gas on the primary side 14a, P2 the gas pressure of the starting gas on the primary side 14b, P2, and the gas pressure P1 of the starting gas on the primary side 14a. A1, the pressure receiving area of the piston 14c that receives the gas pressure P2 of the starting gas on the secondary side 14b is A2, the displacement of the spring 14e is x, and the spring constant is k.
The force F acting on the piston 14c is
F = P1, A1-P2, A2-kx
It is.
When the gas pressure of the starting gas is applied from the secondary side 14b, P1 = 0 and A2 = S1-S2 + S3.
F = −P2 · (S1−S2 + S3) −kx <0
At this time, the seat surface 14d is pressed against the valve seat 14g by the urging force and gas pressure of the spring 14e applied to the piston 14c, whereby the primary side 14a and the secondary side 14b are cut off, and the primary side 14a Since the starting gas does not flow, S1, S2, S3, and kx are designed to satisfy the above equation. In particular, the device is designed so that S1−S2 + S3> 0 so that the pressure and the spring force do not need to be set precisely (for example, d1 = 8 mm, d2 = 12 mm, d3 = 9 mm).

一方、１次側１４ａから起動用ガスのガス圧がかかったとき、ガス圧が、ばね１４ｅがピストン１４ｃを付勢する力以上の圧力であれば、ピストン１４ｃが２次側１４ｂに動き、流路１４ｆを通って２次側１４ｂに起動用ガスが流れる。
ピストンが動作を開始する条件は、初期状態がＰ２＝０であり、Ａ１＝Ｓ１であるので、この不還弁Ｖ１では、
Ｐ１・Ｓ１−ｋｘ＞０
のときに、ピストン１４ｃが動作を開始する。
ピストン１４ｃが動作を開始してから、２次側１４ｂに起動用ガスが流れ込むことによって、Ｐ２の圧力が上昇していき、
Ｐ１・Ａ１−Ｐ２・Ａ２−ｋｘ＝０
となったときに、ピストン１４ｃの動きが停止し、平衡状態となるが、この不還弁Ｖ１では、その形状（２次側１４ｂの起動用ガスのガス圧Ｐ２を受けるピストン１４ｃの受圧面積Ａ２は、大気連通路１４ｉを介して大気圧がかかる部分だけ受圧面積が小さくなっている。）からＡ１＞Ａ２であるため、条件によっては平衡状態にならずピストン１４ｃが２次側１４ｂに圧力によって付勢され続け、ピストン１４ｃが不還弁Ｖ１の弁本体部に当たることによって停止する。このときにピストンに働く力Ｆは、Ｐ１＝Ｐ２であるので
Ｆ＝Ｐ１・（Ｓ２−Ｓ３）-ｋｘ＞０
となる。
上式を満たすとき、１次側１４ａの起動用ガスのガス圧Ｐ１と、２次側１４ｂの起動用ガスのガス圧Ｐ２との間に、圧力差が発生しないようにすることができる。また、Ｐ１は起動用ガスであり十分に大きい値であるため、通常の使用においては上式を満たす。 On the other hand, when the gas pressure of the starting gas is applied from the primary side 14a, if the gas pressure is equal to or higher than the force by which the spring 14e urges the piston 14c, the piston 14c moves to the secondary side 14b and flows. The starting gas flows to the secondary side 14b through the path 14f.
The conditions for starting the operation of the piston are that the initial state is P2 = 0 and A1 = S1, so in this non-return valve V1,
P1 · S1-kx> 0
At this time, the piston 14c starts operating.
Since the starting gas flows into the secondary side 14b after the piston 14c starts operating, the pressure of P2 increases,
P1, A1-P2, A2-kx = 0
When this happens, the movement of the piston 14c stops and reaches an equilibrium state, but the non-return valve V1 has its shape (pressure receiving area A2 of the piston 14c that receives the gas pressure P2 of the starting gas on the secondary side 14b). The pressure receiving area is reduced only in the portion where the atmospheric pressure is applied via the atmospheric communication passage 14i.) Since A1> A2, the piston 14c is not brought into equilibrium by the pressure on the secondary side 14b depending on the conditions. It continues to be energized and stops when the piston 14c hits the valve body of the non-return valve V1. Since the force F acting on the piston at this time is P1 = P2, F = P1 · (S2−S3) −kx> 0
It becomes.
When the above equation is satisfied, it is possible to prevent a pressure difference from being generated between the gas pressure P1 of the starting gas on the primary side 14a and the gas pressure P2 of the starting gas on the secondary side 14b. Moreover, since P1 is a starting gas and has a sufficiently large value, the above equation is satisfied in normal use.

図４に示す、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁Ｖ２は、１次側１４ａと２次側１４ｂとを遮断可能に配設した、ピストン１４ｃと、１次側１４ａに向けてピストン１４ｃを付勢するばね１４ｅと、起動用ガスの流路１４ｆと、シール部１４ｈ１、１４ｈ２と、組み上げ時に閉空間となるピストン室１４ｋとを備えて構成されている。 The non-return valve V2 shown in FIG. 4 that does not cause a pressure difference between the primary side gas pressure and the secondary side gas pressure is arranged so that the primary side 14a and the secondary side 14b can be shut off. 14c, a spring 14e that biases the piston 14c toward the primary side 14a, a starting gas flow path 14f, seal portions 14h1 and 14h2, and a piston chamber 14k that is closed when assembled. Has been.

次に、この不還弁Ｖ２は、以下のように動作する。
２次側１４ｂから起動用ガスのガス圧がかかったとき、ピストン１４ｃにかかるばね１４ｅの付勢力によってピストン１４ｃが図４（ａ）の位置から動かないため、ピストン１４ｃよって１次側１４ａと２次側１４ｂとが遮断され、１次側１４ａには起動用ガスは流れない。 Next, the non-return valve V2 operates as follows.
When the gas pressure of the starting gas is applied from the secondary side 14b, the piston 14c does not move from the position shown in FIG. 4A due to the biasing force of the spring 14e applied to the piston 14c. The secondary side 14b is cut off, and the starting gas does not flow to the primary side 14a.

一方、１次側１４ａから起動用ガスのガス圧がかかったとき、ガス圧が、ばね１４ｅがピストン１４ｃを付勢する力以上の圧力であれば、ピストン１４ｃが２次側１４ｂに動き、流路１４ｆを通って２次側１４ｂに起動用ガスが流れる。
ここで、１次側１４ａの起動用ガスのガス圧をＰ１、２次側１４ｂの起動用ガスのガス圧をＰ２、ピストン室１４ｋ内の圧力をＰ３、１次側１４ａの起動用ガスのガス圧Ｐ１を受けるピストン１４ｃの受圧面積をＡ１、２次側１４ｂの起動用ガスのガス圧Ｐ２を受けるピストン１４ｃの受圧面積をＡ２、ピストン室１４ｋ内の圧力Ｐ３を受けるピストン１４ｃの受圧面積をＡ３、ピストン１４ｃの先端部の直径をｄ１（面積をＳ１＝π・ｄ１^２／４）、ばね１４ｅの変位をｘ、ばね定数をｋとする。
ピストン１４ｃに働く力Ｆは、
Ｆ＝Ｐ１・Ａ１−Ｐ３・Ａ３−ｋｘ
である。
ピストン１４ｃが動作を開始する条件は、初期状態がＰ３は組立時の圧力であるため、Ｐ３＝０であり、Ａ１＝Ｓ１であるので
Ｆ＝Ｐ１・Ｓ１−ｋｘ＞０
のときに、ピストン１４ｃが動作を開始する。
ピストン１４ｃが動作を開始してから、ピストン１４ｃの動作によって、ピストン室１４ｋの容積が減少し、結果としてピストン室１４ｋ内の圧力が上昇する。
この不還弁Ｖ２では、その形状から、条件によっては平衡状態にならずピストン１４ｃがＰ１の圧力によって付勢され続け、ピストン１４ｃが不還弁Ｖ２の弁本体部に当たることによって停止する。このときに働く力ＦはＡ１＝Ａ３＝Ｓ１であるので
Ｆ＝Ｐ１・Ｓ１−Ｐ３・Ｓ１−ｋｘ＞０
となる。
上式を満たすとき、１次側１４ａの起動用ガスのガス圧Ｐ１と、２次側１４ｂの起動用ガスのガス圧Ｐ２との間に、圧力差が発生しないようにすることができる。ピストン１４ｃの移動によってピストン室１４ｋが減少する容積は十分に小さく、よって、ピストン室１４ｋ内の圧力は小さいものとなる。例えば、図４の関係において、容積は３０１１ｍｍ^３から２７０３ｍｍ^３に減少し、圧力は０から０．０１ＭＰａに上昇する。また、Ｐ１は起動用ガスであり十分に大きい値であるため、通常の使用においては上式を満たす。 On the other hand, when the gas pressure of the starting gas is applied from the primary side 14a, if the gas pressure is equal to or higher than the force by which the spring 14e urges the piston 14c, the piston 14c moves to the secondary side 14b and flows. The starting gas flows to the secondary side 14b through the path 14f.
Here, the gas pressure of the startup gas on the primary side 14a is P1, the gas pressure of the startup gas on the secondary side 14b is P2, the pressure in the piston chamber 14k is P3, and the gas of the startup gas on the primary side 14a. The pressure receiving area of the piston 14c receiving the pressure P1 is A1, the pressure receiving area of the piston 14c receiving the gas pressure P2 of the starting gas on the secondary side 14b is A2, and the pressure receiving area of the piston 14c receiving the pressure P3 in the piston chamber 14k is A3. , the diameter of the distal end of the piston 14c d1 (the area ^{S1 = π · d1 2/4} ), the displacement of the spring 14e x, the spring constant and k.
The force F acting on the piston 14c is
F = P1, A1-P3, A3-kx
It is.
The condition for starting the operation of the piston 14c is that, since the initial state P3 is the pressure at the time of assembly, P3 = 0 and A1 = S1, so F = P1 · S1-kx> 0
At this time, the piston 14c starts operating.
After the piston 14c starts operating, the operation of the piston 14c decreases the volume of the piston chamber 14k, and as a result, the pressure in the piston chamber 14k increases.
Due to its shape, the non-return valve V2 does not reach an equilibrium state depending on conditions, and the piston 14c continues to be urged by the pressure of P1, and stops when the piston 14c hits the valve main body of the non-return valve V2. Since the force F acting at this time is A1 = A3 = S1, F = P1, S1-P3, S1-kx> 0
It becomes.
When the above equation is satisfied, it is possible to prevent a pressure difference from being generated between the gas pressure P1 of the starting gas on the primary side 14a and the gas pressure P2 of the starting gas on the secondary side 14b. The volume in which the piston chamber 14k is reduced by the movement of the piston 14c is sufficiently small, and therefore the pressure in the piston chamber 14k is small. For example, in the relationship of FIG. 4, the volume decreases from 3011 mm ³ to 2703 mm ³ and the pressure increases from 0 to 0.01 MPa. Moreover, since P1 is a starting gas and has a sufficiently large value, the above equation is satisfied in normal use.

図５に示す、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁Ｖ３は、１次側１４ａと２次側１４ｂとを遮断可能に配設した、ピストン１４ｃと、１次側１４ａに向けてピストン１４ｃを付勢するばね１４ｅと、起動用ガスの流路１４ｆと、シール部１４ｈ１、１４ｈ２と、大気連通路１４ｉ、作動表示部Ｂとを備えて構成されている。 The non-return valve V3 shown in FIG. 5 that does not cause a pressure difference between the primary side gas pressure and the secondary side gas pressure is disposed so that the primary side 14a and the secondary side 14b can be shut off. 14c, a spring 14e for urging the piston 14c toward the primary side 14a, an activation gas flow path 14f, seal portions 14h1, 14h2, an atmosphere communication passage 14i, and an operation display portion B. Has been.

次に、この不還弁Ｖ３は、以下のように動作する。
２次側１４ｂから起動用ガスのガス圧がかかったとき、ピストン１４ｃにかかるばね１４ｅの付勢力によってピストン１４ｃが図５（ａ）の位置から動かないため、ピストン１４ｃよって１次側１４ａと２次側１４ｂとが遮断され、１次側１４ａには起動用ガスは流れない。 Next, the feedback valve V3 operates as follows.
When the gas pressure of the starting gas is applied from the secondary side 14b, the piston 14c does not move from the position shown in FIG. 5A due to the biasing force of the spring 14e applied to the piston 14c. The secondary side 14b is cut off, and the starting gas does not flow to the primary side 14a.

一方、１次側１４ａから起動用ガスのガス圧がかかったとき、ガス圧が、ばね１４ｅがピストン１４ｃを付勢する力以上の圧力であれば、ピストン１４ｃが２次側１４ｂに動き、流路１４ｆを通って２次側１４ｂに起動用ガスが流れる。
ここで、１次側１４ａの起動用ガスのガス圧をＰ１、２次側１４ｂの起動用ガスのガス圧をＰ２、大気連通路１４ｉ側の大気圧Ｐ３、１次側１４ａの起動用ガスのガス圧Ｐ１を受けるピストン１４ｃの受圧面積をＡ１、２次側１４ｂの起動用ガスのガス圧Ｐ２を受けるピストン１４ｃの受圧面積をＡ２、大気連通路１４ｉ側の受圧面積Ａ３、ピストン１４ｃの先端部の直径をｄ１（面積をＳ１＝π・ｄ１^２／４）、ばね１４ｅの変位をｘ、ばね定数をｋとする。
ピストン１４ｃに働く力Ｆは、
Ｆ＝Ｐ１・Ａ１−Ｐ３・Ａ３−ｋｘ
である。
ピストン１４ｃが動作を開始する条件は、初期状態がＰ３＝０、Ａ１＝Ｓ１であるので、この不還弁Ｖ３では、
Ｆ＝Ｐ１・Ｓ１−ｋｘ＞０
のときに、ピストン１４ｃが動作を開始する。
ピストン１４ｃが動作を開始してから、２次側１４ｂに起動用ガスが流れ込むことによって、Ｐ２の圧力が上昇していく。
この不還弁Ｖ３では、１４ｉによって大気開放されていることにより常にＰ３＝０であるので、ピストン１４ｃの動作条件が満たされれば、平衡状態にならずピストン１４ｃが１次側１４ａの圧力によって付勢され続け、ピストン１４ｃが不還弁Ｖ３の弁本体部に当たることによって停止する。
このとき、１次側１４ａの起動用ガスのガス圧Ｐ１と、２次側１４ｂの起動用ガスのガス圧Ｐ２との間に、圧力差が発生しない。
また、このとき表示器Ｂが不還弁Ｖ３の弁本体部から突出することにより、不還弁Ｖ３の動作状態を確認できる。この表示器は着色や一部欠損させることなどによって、視認性を向上させてもよい。 On the other hand, when the gas pressure of the starting gas is applied from the primary side 14a, if the gas pressure is equal to or higher than the force by which the spring 14e urges the piston 14c, the piston 14c moves to the secondary side 14b and flows. The starting gas flows to the secondary side 14b through the path 14f.
Here, the gas pressure of the startup gas on the primary side 14a is P1, the gas pressure of the startup gas on the secondary side 14b is P2, the atmospheric pressure P3 on the atmosphere communication path 14i side, and the startup gas on the primary side 14a The pressure receiving area of the piston 14c that receives the gas pressure P1 is A1, the pressure receiving area of the piston 14c that receives the gas pressure P2 of the starting gas on the secondary side 14b is A2, the pressure receiving area A3 on the atmosphere communication path 14i side, and the tip of the piston 14c the diameter d1 (area of ^{S1 = π · d1 2/4} ), the displacement of the spring 14e x, the spring constant and k.
The force F acting on the piston 14c is
F = P1, A1-P3, A3-kx
It is.
The conditions for starting the operation of the piston 14c are P3 = 0 and A1 = S1 in the initial state. Therefore, in the non-return valve V3,
F = P1 · S1-kx> 0
At this time, the piston 14c starts operating.
Since the starting gas flows into the secondary side 14b after the piston 14c starts operating, the pressure of P2 increases.
In this non-return valve V3, P3 = 0 is always set by being open to the atmosphere by 14i. Therefore, if the operating condition of the piston 14c is satisfied, the piston 14c is not brought into an equilibrium state by the pressure of the primary side 14a. The piston 14c is stopped when the piston 14c hits the valve main body of the non-return valve V3.
At this time, no pressure difference is generated between the gas pressure P1 of the starting gas on the primary side 14a and the gas pressure P2 of the starting gas on the secondary side 14b.
At this time, the operating state of the non-return valve V3 can be confirmed by the indicator B projecting from the valve body of the non-return valve V3. The display may be improved in visibility by coloring or partial loss.

図６に示す、１次側のガス圧と２次側のガス圧とに圧力差が生じない不還弁Ｖ４は、図５に示す不還弁Ｖ３と、基本的な構造及び作用は同じである。ただし、Ｏリングの装着溝にシール部１４ｈ１に急激な圧力上昇によるＯリングの脱落が発生しにくくなる加工がされている。 The non-return valve V4 shown in FIG. 6 that does not produce a pressure difference between the primary gas pressure and the secondary gas pressure has the same basic structure and operation as the non-return valve V3 shown in FIG. is there. However, the O-ring mounting groove is processed to make it difficult for the O-ring to drop off due to a sudden pressure increase in the seal portion 14h1.

以上、本発明の起動用ガス管路に不還弁を介在させたガス系消火システムについて、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。 The gas fire extinguishing system in which the nonreturn valve is interposed in the starting gas pipeline of the present invention has been described based on the embodiment. However, the present invention is not limited to the configuration described in the above embodiment. However, the configuration can be changed as appropriate without departing from the spirit of the invention.

本発明の起動用ガス管路に不還弁を介在させたガス系消火システムは、複数の不還弁を起動用ガス管路に直列状態で介在させた場合でも、各不還弁の位置で起動用ガスの圧力が低下せず、起動用ガス管路の末端の圧力を維持して、容器弁の作動の安定性が確保することができるという特性を有していることから、起動用ガス管路に不還弁を介在させたガス系消火システムの用途に好適に用いることができる。 In the gas fire extinguishing system in which the nonreturn valve is interposed in the starting gas pipeline of the present invention, even when a plurality of nonreturn valves are interposed in series in the starting gas conduit, Since the pressure of the starting gas does not decrease and the pressure at the end of the starting gas line is maintained, the stability of the operation of the container valve can be ensured. It can use suitably for the use of the gas fire extinguishing system which interposed the non-return valve in the pipe line.

１消火剤貯蔵容器
２容器弁
６消火対象区画
７噴射ヘッド
１３−１、１３−２、１３−３起動用ガス管路
１４−１、１４−２、１４−３、１４−Ａ、１４−Ｂ不還弁
Ｖ１不還弁
Ｖ２不還弁
Ｖ３不還弁
Ｖ４不還弁 DESCRIPTION OF SYMBOLS 1 Fire extinguisher storage container 2 Container valve 6 Fire extinguishing object section 7 Injection head 13-1, 13-2, 13-3 Gas line for starting 14-1, 14-2, 14-3, 14-A, 14-B Non-return valve V1 Non-return valve V2 Non-return valve V3 Non-return valve V4 Non-return valve

Claims

A container valve is provided in each of the plurality of extinguishing agent storage containers, and the container valve is connected by a starting gas pipe line interposed with a non-return valve that restricts the flow direction of the starting gas. By supplying the starting gas to the starting gas line, the container valve is selectively opened, and the gas-based fire extinguisher stored in the fire extinguisher storage container corresponding to the opened container valve is supplied to the container valve. In the gas fire extinguishing system in which a nonreturn valve is interposed in the starting gas line, the primary gas pressure and 2 are supplied to the nonreturn valve. A gas fire extinguishing system in which a nonreturn valve is interposed in a starting gas pipe, wherein a nonreturn valve that does not cause a pressure difference with the gas pressure on the next side is used.