Multi-point control non-pressure liquid fire extinguishing agent fire extinguishing system and working method thereof

Abstract

The application belongs to the field of fire extinguishing device, and particularly relates to a multi-point control non-pressure liquid fire extinguishing agent fire extinguishing system and a working method thereof. The fire extinguishing system comprises a main tank body, a first end cover and a gas generating mechanism which are detachably connected to two ends of the main tank body respectively; a liquid outlet hole is formed in the first end cover, and a thin metal diaphragm for plugging the liquid outlet hole is detachably connected to one side of the main tank body close to the liquid outlet hole; a liquid spraying pipe is arranged on the other side of the liquid outlet hole, and a plurality of spray heads are arranged on the liquid spraying pipe and used for spraying liquid fire extinguishing agent to each partition layer of a closed space respectively; a piston is slidably arranged in the main tank body and close to the front side of the gas generating mechanism, and a liquid storage cavity for storing liquid fire extinguishing agent is formed between the piston and the first end cover; the spray heads on the liquid spraying pipe of the fire extinguishing system are multi-point controlled, so that the liquid fire extinguishing agent can be sprayed to each partition layer of the closed space respectively, the liquid fire extinguishing agent can be dispersed to each partition layer for fire extinguishing, and the fire of each partition layer can be timely responded.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing devices, specifically to a multi-point controlled non-pressurized liquid extinguishing agent fire extinguishing system and its working method. Background Technology

[0002] Traditional non-pressurized liquid extinguishing agent fire suppression systems are ineffective in spaces with large openings (such as communication cabinets). Due to the large opening area, the extinguishing agent concentration is low and cannot effectively suppress the fire source. If the space has vertical partitions, only the layer closest to the extinguishing device can be effectively extinguished; the other partition layers can only be extinguished through liquid extinguishing agent seeping through the gaps, further reducing the extinguishing effect. Furthermore, the location of the ignition source in the partition layers of protected spaces such as communication cabinets is unpredictable. Especially when the extinguishing device is installed above the protected area, and a fire breaks out in the lowest partition layer, the extinguishing device cannot effectively respond and extinguish the fire in time, resulting in damage. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-point controlled non-pressurized liquid extinguishing agent fire extinguishing system and its working method.

[0004] To address the aforementioned technical problems, this invention provides a multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system, comprising: a main tank, with a first end cap and a gas generating mechanism detachably connected to its two ends respectively; the first end cap has a liquid outlet hole, and a thin metal diaphragm for sealing the liquid outlet hole is detachably connected to the side of the liquid outlet hole near the main tank; a spray pipe, disposed on the other side of the liquid outlet hole, having a plurality of nozzles disposed thereon for spraying liquid extinguishing agent into each partition layer of the enclosed space; a piston, slidably disposed within the main tank and near the front side of the gas generating mechanism, and a storage chamber for storing liquid extinguishing agent is formed between the piston and the first end cap; wherein the gas generating mechanism is adapted to generate a driving force to push the piston toward the first end cap, so that when the pressure in the storage chamber reaches a preset value, the thin metal diaphragm is broken, causing the liquid extinguishing agent to be sprayed from the liquid outlet hole through the spray pipe from each nozzle.

[0005] Furthermore, the multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system further includes: at least one extinguishing agent replenishment tank, each connected to a side of the storage chamber near the first end cap via a connecting pipe, suitable for replenishing the storage chamber with liquid extinguishing agent; wherein each connecting pipe is provided with a first solenoid valve at the end near the corresponding extinguishing agent replenishment tank, suitable for opening when replenishing the storage chamber with liquid extinguishing agent; a second solenoid valve is provided at the end of the spray pipe near the liquid outlet, suitable for closing when replenishing the storage chamber with liquid extinguishing agent; and a pressure relief valve is provided on the side of the main tank near the gas generating mechanism, suitable for opening when replenishing the storage chamber with liquid extinguishing agent.

[0006] Furthermore, the middle part of the liquid outlet is configured as a small diameter section, and its front and rear ends are configured as large diameter sections; a metal washer and a through-hole plug are detachably connected to the rear end of the liquid outlet in sequence; wherein the through-hole plug is adapted to be threaded into the inner wall of the rear end of the liquid outlet so as to press the thin metal diaphragm tightly against the rear end of the small diameter section through the metal washer; and one end of the spray pipe is adapted to extend into the front end of the liquid outlet and abut against the front end of the small diameter section.

[0007] Furthermore, the gas generating mechanism includes: a second end cap, detachably connected to the end of the main tank away from the first end cap; at least two gas-generating agent chambers, respectively disposed inside the second end cap to store gas-generating tablets, both communicating with the interior of the main tank, and adjacent gas-generating agent chambers separated by partitions; and a wire outlet, disposed at the end of the second end cap away from the main tank, suitable for detachably installing a wire outlet connector; wherein the wire outlet connector is suitable for leading out leads connected to the gas-generating tablets in each gas-generating agent chamber, and igniting the gas-generating tablets in the corresponding gas-generating agent chamber through the corresponding leads to generate a large amount of gas to push the piston toward the first end cap side.

[0008] Furthermore, a slag-separating plate is provided inside the second end cap on the side of each of the gas-generating agent chambers facing the liquid storage chamber; and a retaining spring groove is provided inside the second end cap on the outer side of the slag-separating plate, which is suitable for installing a retaining spring to block the slag-separating plate.

[0009] Furthermore, the piston has a pusher portion recessed inward on the side near the gas generating mechanism; and an annular venting groove is provided in the middle section of the piston.

[0010] Furthermore, the liquid extinguishing agent is one of water, heptafluoropropane, hexafluoropropane, and perfluorohexanone.

[0011] On another aspect, the present invention also provides a method for operating a multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system, comprising: a fire-triggered gas generating mechanism to generate a large amount of gas; pushing a piston to squeeze the liquid extinguishing agent in the storage chamber to break the thin metal diaphragm when the pressure in the storage chamber reaches a preset value; pushing the piston to push the liquid extinguishing agent in the storage chamber from the liquid outlet into the spray pipe, and spraying it out from each nozzle respectively.

[0012] Furthermore, the operating method of the multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system further includes: when the piston moves toward the first end cap to a preset position, closing the second solenoid valve and simultaneously opening the pressure relief valve and the first solenoid valve, so that the liquid extinguishing agent in the extinguishing agent replenishment tank fills the storage chamber under the action of a pushing force; when the liquid extinguishing agent in the storage chamber is full, simultaneously closing the pressure relief valve and the first solenoid valve and opening the second solenoid valve; triggering the gas generating mechanism again to generate a large amount of gas to push the liquid extinguishing agent in the storage chamber back into the spray pipe from the liquid outlet, and spraying it out from each nozzle.

[0013] The beneficial effects of the present invention are that the first end cap and the gas generating mechanism are detachably connected to the main tank, which facilitates reuse after replacing the thin metal diaphragm and the gas generating tablet. The nozzles on the spray pipe are deployed at multiple points, which facilitates the spraying of liquid extinguishing agent to each partition layer of the enclosed space, so that the liquid extinguishing agent can be dispersed to each partition layer for fire extinguishing and timely response to the fire situation in each partition layer.

[0014] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a top view of the multi-point deployment non-pressurized liquid extinguishing agent fire extinguishing system of the present invention;

[0018] Figure 2 yes Figure 1A cross-sectional view along the AA direction.

[0019] In the picture:

[0020] Main tank 1, first end cap 2, liquid outlet 21, gas generating mechanism 3, second end cap 31, gas generating agent chamber 32, wire outlet 33, slag separator 34, snap ring groove 35, thin metal diaphragm 4, spray pipe 5, nozzle 51, second solenoid valve 52, piston 6, push part 61, annular venting groove 62, extinguishing agent replenishment tank 7, first solenoid valve 71, pressure relief valve 8, metal gasket 9, vent plug 10. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 1 and Figure 2 As shown, this embodiment provides a multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system, including: a main tank 1, with a first end cap 2 and a gas generating mechanism 3 detachably connected to its two ends respectively; the first end cap 2 has a liquid outlet 21, and a thin metal diaphragm 4 for sealing the liquid outlet 21 is detachably connected to the side of the liquid outlet 21 near the main tank 1; a spray pipe 5 is set on the other side of the liquid outlet 21, and a plurality of nozzles 51 are set on it, respectively for spraying liquid extinguishing agent into each partition layer of the enclosed space; a piston 6 is slidably set in the main tank 1 and near the front side of the gas generating mechanism 3, and a storage chamber for storing liquid extinguishing agent is formed between the piston 6 and the first end cap 2; wherein the gas generating mechanism 3 is adapted to generate a driving force to push the piston 6 to move towards the first end cap 2, so that when the pressure in the storage chamber reaches a preset value, the thin metal diaphragm 4 is broken, so that the liquid extinguishing agent is sprayed out from the liquid outlet 21 through each nozzle 51.

[0024] In this embodiment, the first end cap 2 and the gas generating mechanism 3 are detachably connected to the main tank 1, which facilitates reuse after replacing the thin metal diaphragm 4 and the gas generating tablet; the nozzles 51 on the spray pipe 5 are deployed at multiple points, which facilitates the spraying of liquid extinguishing agent to each partition layer of the enclosed space, so that the liquid extinguishing agent can be dispersed to each partition layer for fire extinguishing and timely response to the fire situation in each partition layer.

[0025] In this embodiment, the nozzle 51 can be an atomizing nozzle, and the enclosed space can be, but is not limited to, an electrical cabinet, a multi-layer storage cabinet, etc.

[0026] In some application scenarios, traditional fire extinguishing systems can only store a certain amount of extinguishing agent in their liquid storage chambers. When the enclosed space is large, even if all the liquid extinguishing agent is sprayed out, the fire source cannot be completely extinguished.

[0027] In other application scenarios, if there are still embers in an enclosed space, opening the enclosed space could cause the embers to suddenly come into contact with a large amount of air, resulting in a deflagration and an accident. Therefore, secondary fire extinguishing is required.

[0028] In this embodiment, the multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system further includes: at least one extinguishing agent replenishment tank 7, which is connected to the side of the liquid storage chamber near the first end cap 2 via a connecting pipe, and is adapted to replenish the liquid storage chamber with liquid extinguishing agent; wherein each connecting pipe is provided with a first solenoid valve 71 at the end near the corresponding extinguishing agent replenishment tank 7, which is adapted to open when replenishing the liquid storage chamber with liquid extinguishing agent; a second solenoid valve 52 is provided at the end of the spray pipe near the liquid outlet 21, which is adapted to close when replenishing the liquid storage chamber with liquid extinguishing agent; and a pressure relief valve 8 is provided on the side of the main tank 1 near the gas generating mechanism 3, which is adapted to open when replenishing the liquid storage chamber with liquid extinguishing agent.

[0029] In this embodiment, the second solenoid valve 52 at the end of the spray pipe 5 near the outlet 21 is normally open. After the first liquid extinguishing agent breaks through the thin metal diaphragm 4 and sprays out, it is closed when it is necessary to fill the storage chamber with extinguishing agent to seal the storage chamber and prevent the liquid extinguishing agent from flowing out of the outlet 21 when the liquid extinguishing agent is filling the storage chamber.

[0030] In this embodiment, optionally, the first solenoid valve 71, the second solenoid valve 52, and the pressure relief valve 8 are all solenoid valves and are electrically connected to the control module (which may be a PLC). A first trigger position is provided on the inner side of the main tank 1, near the connecting pipe on the front side of the piston 6, and a second trigger position is provided on the inner side of the main tank 1, near the pressure relief valve 8 on the rear side of the piston. When the piston 6 is pushed to the first trigger position by a large amount of gas generated by the gas generating mechanism 3, a first trigger signal is sent to the control module. The control module controls the second solenoid valve 52 to close and controls the corresponding first solenoid valve 71 and pressure relief valve 8 to open, thus extinguishing the fire. The fire extinguishing agent replenishment tank 7... It can be that after filling with liquid extinguishing agent, it is pressurized and stored. The liquid extinguishing agent in the extinguishing agent replenishment tank 7 enters the storage chamber through the corresponding connecting pipe by the pressure difference between the extinguishing agent replenishment tank 7 and the storage chamber, pushing the piston 6 towards the pressure relief valve 8. When the piston 6 is pushed to the second trigger position, a second trigger signal is sent to the control module to control the pressure relief valve 8 and each of the first solenoid valves 71 to close, and control the second solenoid valve 52 to open, so that the gas generating mechanism 3 can generate a large amount of gas again to push the piston 6 towards the first end cap 2, and spray the liquid extinguishing agent in the storage chamber again from each nozzle 51 of the spray pipe 5 for secondary fire extinguishing.

[0031] In this embodiment, the first trigger position and the second trigger position can be triggered by photoelectric sensors. When the photoelectric sensor at the first trigger position detects the piston 6, it sends a first trigger signal to the control module. When the photoelectric sensor at the second trigger position detects the piston 6, it sends a second trigger signal to the control module.

[0032] In this embodiment, the middle part of the liquid outlet 21 is configured as a small diameter part, and its front and rear ends are configured as large diameter parts; the rear end of the liquid outlet 21 is detachably connected to a metal washer 9 and a through-hole plug 10 in sequence; wherein the through-hole plug 10 is adapted to be threaded into the inner wall of the rear end of the liquid outlet 21 so as to press the thin metal diaphragm 4 against the rear end of the small diameter part through the metal washer 9; and one end of the spray pipe 5 is adapted to extend into the front end of the liquid outlet 21 and abut against the front end of the small diameter part.

[0033] In this embodiment, one end of the through-hole plug 10 is threaded into the rear end of the liquid outlet 21, and the thin metal diaphragm 4 is pressed tightly against the small diameter part by the metal washer 9, and the other end of the through-hole plug 10 is exposed outside the liquid outlet 21. The purpose is to facilitate the disassembly and replacement of the thin metal diaphragm 4 when resetting the fire extinguishing system.

[0034] In some application scenarios, traditional non-pressurized fire extinguishing systems only have one gas-generating agent chamber 32, which cannot push the liquid extinguishing agent that has been refilled into the liquid storage chamber out of the main tank 1 without disassembly.

[0035] In this embodiment, the gas generating mechanism 3 includes: a second end cap 31, detachably connected to the end of the main tank 1 away from the first end cap 2; at least two gas generating agent chambers 32, respectively disposed inside the second end cap 31 to store gas generating tablets, both of which communicate with the interior of the main tank 1, and adjacent gas generating agent chambers 32 are separated by partitions; and a wire outlet 33, disposed at the end of the second end cap 31 away from the main tank 1, suitable for detachably installing a wire outlet connector; wherein the wire outlet connector is suitable for leading out leads connected to the gas generating tablets in each gas generating agent chamber 32, and igniting the gas generating tablets in the corresponding gas generating agent chamber 32 through the corresponding leads to generate a large amount of gas to push the piston 6 toward the first end cap 2.

[0036] In this embodiment, adjacent gas-generating agent compartments 32 are separated by partitions. The gas-generating tablets in each gas-generating agent compartment 32 are led out of the outlet hole 21 through the outlet hole connector via corresponding leads. When the gas generating mechanism 3 of the fire extinguishing system is triggered for the first time, it can be a temperature sensor, smoke sensor, or carbon monoxide concentration sensor directly connected to the leads. When the temperature detected by the temperature sensor exceeds its set threshold, the smoke concentration detected by the smoke sensor exceeds its set threshold, or the carbon monoxide concentration sensor detects that the carbon monoxide concentration exceeds its set threshold, the gas-generating tablets in the corresponding gas-generating agent compartment 32 are triggered to ignite. Alternatively, the temperature sensor, smoke sensor, or carbon monoxide concentration sensor can be connected to the corresponding leads through a control module. When the control module receives a signal from each sensor that exceeds its set threshold, it controls the leads to ignite the gas-generating tablets. Alternatively, the gas-generating tablets can be manually ignited.

[0037] In this embodiment, when the liquid extinguishing agent is refilled into the storage chamber for secondary fire extinguishing, the leads of the gas-generating tablets in the untriggered gas-generating agent compartment 32 can be controlled by the control module. When the control module receives the second trigger signal, it controls the corresponding lead to ignite the corresponding gas-generating tablet. Alternatively, the ignition can be manually triggered by the operator. The gas-generating tablets can be, but are not limited to, aerosols.

[0038] In this embodiment, a slag-separating plate 34 is also provided inside the second end cap 31 on the side of each of the gas-generating agent chambers 32 facing the liquid storage chamber; and a retaining spring groove 35 is provided inside the second end cap 31 on the outside of the slag-separating plate 34, which is suitable for installing a retaining spring to block the slag-separating plate 34.

[0039] In this embodiment, the removable retaining spring in the retaining spring groove 35 can restrict the position of the slag-separating plate 34. After the gas-generating tablets in each gas-generating agent chamber 32 have finished reacting, when it is necessary to replace the gas-generating tablets, the retaining spring and the slag-separating plate 34 can be removed, and the gas-generating tablets can be refilled into each gas-generating agent chamber 32 to achieve the effect of reuse.

[0040] In this embodiment, the piston 6 is recessed inward on the side near the gas generating mechanism 3 with a pushing part 61; and the piston 6 is provided with an annular venting groove 62 in the middle section.

[0041] In this embodiment, the pusher 61 facilitates the convergence of a large amount of gas generated by the gas-producing tablet to push the piston 6 toward the first end cap 2. The annular venting groove 62 is adapted to reduce the contact area between the piston 6 and the inner wall of the main canister 1, so as to reduce the resistance to the piston 6's forward movement and make the piston 6 be pushed more smoothly.

[0042] In this embodiment, the liquid fire extinguishing agent may be one of water, heptafluoropropane, hexafluoropropane, or perfluorohexanone.

[0043] In specific implementations, the selection of liquid extinguishing agents can be based on actual fire extinguishing needs. For example, water cannot be selected as the liquid extinguishing agent for fire extinguishing systems in electrical cabinets.

[0044] Example 2

[0045] Based on the above embodiment 1, this embodiment also provides a working method for a multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system, including: a fire-triggered gas generating mechanism 3 to generate a large amount of gas; pushing a piston 6 to squeeze the liquid extinguishing agent in the storage chamber to break the thin metal diaphragm 4 when the pressure in the storage chamber reaches a preset value; pushing the piston 6 to push the liquid extinguishing agent in the storage chamber from the liquid outlet 21 into the spray pipe 5, and spraying it out from each nozzle 51 respectively.

[0046] In a specific implementation, after discovering a fire, staff can manually trigger a fuse to ignite a gas-generating tablet in one gas-generating agent compartment 32. Alternatively, when a temperature sensor detects that the temperature has reached a threshold, a smoke sensor detects that the smoke concentration has reached a threshold, or a carbon monoxide concentration sensor detects that the corresponding concentration has reached a threshold, the corresponding fuse can be used to ignite a gas-generating tablet in another gas-generating agent compartment 32 to generate a large amount of gas. This gas will push the piston 6 to compress the liquid extinguishing agent in the storage chamber. When the pressure of the liquid extinguishing agent on the thin metal diaphragm 4 exceeds its pressure tolerance, the liquid extinguishing agent will be pushed by the piston 6 to break through the thin metal diaphragm 4 and spray the liquid extinguishing agent from each nozzle 51 of the spray pipe 5 into each partition layer of the enclosed space.

[0047] In this embodiment, the working method of the multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system further includes: when the piston 6 moves toward the first end cap 2 to a preset position, closing the second solenoid valve 71 and simultaneously opening the pressure relief valve 8 and the first solenoid valve 52, so that the liquid extinguishing agent in the extinguishing agent replenishment tank 7 fills the storage chamber under the action of a pushing force; when the liquid extinguishing agent in the storage chamber is full, simultaneously closing the pressure relief valve 8 and the first solenoid valve 52 and opening the second solenoid valve 71; triggering the gas generating mechanism 3 again to generate a large amount of gas to push the liquid extinguishing agent in the storage chamber back into the spray pipe 5 from the liquid outlet 21, and spraying it out from each nozzle 51 respectively.

[0048] In this embodiment, when the piston 6 moves toward the first end cap 2 to the preset position, that is, when the piston 6 moves to the first trigger position, the corresponding photoelectric sensor is triggered. Since the amount of liquid extinguishing agent sprayed at each nozzle 51 of the multi-point fire extinguishing system is insufficient, there are hidden spark hazards remaining. In order to prevent the hidden sparks from suddenly coming into contact with a large amount of fresh air and causing deflagration when the staff opens the closed space after the fire extinguishing for cleaning, after the first liquid extinguishing agent is sprayed for fire extinguishing, the liquid extinguishing agent can be filled into the storage chamber at least once according to the number and volume of the extinguishing agent replenishment tank 7, so as to perform secondary fire extinguishing or even more fire extinguishing on each partition layer of the closed space until all hidden spark hazards are eliminated.

[0049] In summary, one end of the through-hole plug 10 is threaded into the rear end of the outlet hole 21, and the thin metal diaphragm 4 is tightly pressed against the small diameter portion by the metal washer 9. The other end of the through-hole plug 10 is exposed outside the outlet hole 21, facilitating the removal and replacement of the thin metal diaphragm 4 when resetting the fire extinguishing system for reuse. The removable retaining spring in the retaining spring groove 35 can restrict the position of the slag-separating plate 34. After the gas-generating tablets in each gas-generating agent chamber 32 have finished reacting, when it is necessary to replace the gas-generating tablets, the retaining spring and the slag-separating plate 34 can be removed, and gas-generating tablets can be refilled into each gas-generating agent chamber 32 to achieve the effect of reuse. To prevent hidden sparks from suddenly coming into contact with a large amount of fresh air and causing a deflagration when staff open the enclosed space after fire extinguishing for cleanup, after the first spray of liquid extinguishing agent, the storage chamber can be filled with liquid extinguishing agent at least once, depending on the number and volume of the extinguishing agent replenishment tank 7. This allows for secondary or even more fire extinguishing of each partition layer in the enclosed space until all hidden spark hazards are eliminated.

[0050] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system, characterized in that, include: The main tank (1) has a first end cap (2) and a gas generating mechanism (3) detachably connected to its two ends respectively; the first end cap (2) has a liquid outlet hole (21) and a thin metal diaphragm (4) for sealing the liquid outlet hole (21) is detachably connected to the side of the liquid outlet hole (21) near the main tank 1. The spray pipe (5) is located on the other side of the liquid outlet (21), and several nozzles (51) are installed on it, which are used to spray liquid extinguishing agent into each partition layer of the enclosed space. A piston (6) is slidably disposed inside the main tank (1) and close to the front side of the gas generating mechanism (3), and a storage chamber for storing liquid extinguishing agent is formed between the piston (6) and the first end cap (2); wherein the gas generating mechanism (3) is adapted to generate a driving force to push the piston (6) to move towards the first end cap (2) so as to break the thin metal diaphragm (4) when the pressure in the storage chamber reaches a preset value, so that the liquid extinguishing agent is sprayed from the outlet hole (21) through the spray pipe (5) from each nozzle (51); At least one fire extinguishing agent replenishment tank (7) is connected to the side of the storage chamber near the first end cap (2) via a connecting pipe, and is suitable for replenishing liquid fire extinguishing agent into the storage chamber; wherein each connecting pipe is provided with a first solenoid valve (71) at the end near the corresponding fire extinguishing agent replenishment tank (7), which is suitable for opening when replenishing liquid fire extinguishing agent into the storage chamber; the spray pipe (5) is provided with a second solenoid valve (52) at the end near the liquid outlet (21), which is suitable for closing when replenishing liquid fire extinguishing agent into the storage chamber; and a pressure relief valve (8) is provided on the side of the main tank (1) near the gas generating mechanism (3), which is suitable for opening when replenishing liquid fire extinguishing agent into the storage chamber; The first solenoid valve (71), the second solenoid valve (52), and the pressure relief valve (8) are all electrically connected to the control module. A first trigger position is set on the inner side of the main tank (1) near the connecting pipe in front of the piston (6), and a second trigger position is set on the inner side of the main tank (1) near the pressure relief valve (8) in front of the piston. When the piston (6) is pushed to the first trigger position by a large amount of gas generated by the gas generating mechanism (3), a first trigger signal is sent to the control module. The control module controls the second solenoid valve (52) to close and controls the corresponding first solenoid valve (71) and pressure relief valve (8) to open, and the extinguishing agent is replenished. The pressure difference between the tank (7) and the storage chamber causes the liquid extinguishing agent in the extinguishing agent replenishment tank (7) to enter the storage chamber through the corresponding connecting pipe, pushing the piston (6) toward the pressure relief valve (8). When the piston (6) is pushed to the second trigger position, a second trigger signal is sent to the control module to control the pressure relief valve (8) and each of the first solenoid valves (71) to close, and control the second solenoid valve (52) to open. The gas generating mechanism (3) generates a large amount of gas again to push the piston (6) toward the first end cap (2), and sprays the liquid extinguishing agent in the storage chamber out again from each nozzle (51) of the spray pipe (5) for secondary fire extinguishing. The gas generating mechanism (3) includes: The second end cap (31) is detachably connected to the end of the main tank (1) away from the first end cap (2); At least two gas-generating agent compartments (32) are respectively located inside the second end cap (31) to store gas-generating tablets. They are all connected to the interior of the main tank (1), and adjacent gas-generating agent compartments (32) are separated by partitions.

2. The multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system according to claim 1, characterized in that, The middle part of the liquid outlet (21) is set as a small diameter part, and its front and rear ends are set as large diameter parts; The rear end of the liquid outlet (21) is detachably connected to a metal washer (9) and a throat plug (10); wherein The sluice gate plug (10) is adapted to engage with the inner wall thread of the rear end portion of the liquid outlet (21) to press the thin metal diaphragm (4) against the rear end of the small diameter portion via a metal washer (9); and One end of the spray pipe (5) is adapted to extend into the front end of the liquid outlet (21) and abut against the front end of the small diameter portion.

3. The multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system according to claim 2, characterized in that, The gas generating mechanism (3) also includes: The outlet hole (33) is located at the end of the second end cap (31) away from the main tank body (1), and is suitable for detachable installation of the outlet hole connector; wherein The outlet connector is adapted to lead out leads that are connected to the gas-generating tablets in each gas-generating agent compartment (32), and ignite the gas-generating tablets in the corresponding gas-generating agent compartment (32) through the corresponding leads to generate a large amount of gas to push the piston (6) to move toward the first end cap (2).

4. The multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system according to claim 3, characterized in that, The second end cap (31) is further provided with a slag separator (34) on the side of each of the gas-generating agent chambers (32) facing the liquid storage chamber; and The second end cap (31) has a retaining spring groove (35) on the outside of the slag-blocking plate (34) for installing a retaining spring to block the slag-blocking plate (34).

5. The multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system according to claim 4, characterized in that, The piston (6) has a recessed pusher (61) on the side near the gas generating mechanism (3); and The piston (6) is provided with an annular vent groove (62) in the middle section.

6. The multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system according to claim 5 is characterized in that, The liquid extinguishing agent is one of water, heptafluoropropane, hexafluoropropane, and perfluorohexanone.

7. A method for operating a multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system as described in any one of claims 1-6, characterized in that, include: Fire-triggered gas generating mechanism (3) to generate a large amount of gas; The piston (6) is pushed to squeeze the liquid extinguishing agent in the storage chamber so as to break the thin metal diaphragm (4) when the pressure in the storage chamber reaches the preset value; The piston (6) pushes the liquid extinguishing agent in the storage chamber into the spray pipe (5) from the outlet (21), and sprays it out from each nozzle (51).

8. The working method of the multi-point deployed non-pressurized liquid extinguishing agent fire extinguishing system according to claim 7, characterized in that, Also includes: When the piston (6) moves toward the first end cap (2) to the preset position, the second solenoid valve (71) is closed, and the pressure relief valve (8) and the first solenoid valve (52) are opened at the same time, so that the liquid extinguishing agent in the extinguishing agent replenishment tank (7) is filled into the storage chamber under the action of a pushing force; When the liquid extinguishing agent in the storage chamber is full, the pressure relief valve (8) and the first solenoid valve (52) are closed at the same time, and the second solenoid valve (71) is opened; the gas generating mechanism (3) is triggered again to generate a large amount of gas to push the liquid extinguishing agent in the storage chamber back into the spray pipe (5) from the liquid outlet (21) and spray it out from each nozzle (51).

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