Fire extinguishing system and fire extinguishing method

Abstract

The invention relates to a fire extinguishing system and a fire extinguishing method. The fire extinguishing system comprises: a liquid container for storing a liquid fire extinguishing material; the gas container is used for compressing and storing gas fire extinguishing materials; the spray guns are used for spraying liquid fire extinguishing materials and gas fire extinguishing materials; the pneumatic pump is respectively communicated with the liquid container, the gas container and each spray gun through a plurality of pipelines, and is used for respectively conveying the liquid fire extinguishing material and the gas fire extinguishing material to each spray gun through the pressure of the gas fire extinguishing material in the gas container and spraying the liquid fire extinguishing material and the gas fire extinguishing material; and the plurality of one-way valves are respectively arranged on each pipeline. Through gas-liquid mixed injection, the cooling effect can be improved, and re-combustion is avoided; the fire extinguishing effect is improved, the fire extinguishing agent consumption is reduced, the fire extinguishing agent storage amount is reduced, and the system weight is reduced; excessive pump sets are not needed, the system is simplified, and the total weight is reduced.

Description

Technical Field

[0001] The present invention relates to the field of fire protection, and in particular to a fire extinguishing system and a fire extinguishing method. Background Art

[0002] In the face of green aviation's climate development goals, the aviation industry is facing increasingly stringent emission and economic requirements, and the transformation and development of aircraft and power systems has become increasingly important and urgent. At present, the international aviation powers, especially European and American aviation powers, attach great importance to the research and development of green aviation power. A number of major research plans have been issued at the national level to promote the design of all-electric and hybrid concept flight platforms, promote the development of hybrid technology, and accelerate the commercial operation of all-electric and hybrid aircraft to strengthen their leading position. The advantages of hybrid electric propulsion technology in reducing fuel consumption and emissions have attracted the attention of the aviation industry. GE, Rolls-Royce, Safran and other companies have been actively deploying hybrid power technology, with power levels ranging from kilowatts to megawatts to meet different application scenarios and customer needs.

[0003] The power of current hybrid vehicles mainly comes from large lithium batteries, and lithium iron phosphate is mainly used. Lithium iron phosphate is prone to thermal runaway in the presence of an ignition source, which can cause a fire. However, there are at least the following technical problems with the fire extinguishing system of airborne power batteries: 1. The poor cooling effect of gas fire extinguishing agents causes the battery temperature to rise sharply after the fire extinguishing agent is used up, posing a risk of re-ignition. 2. The system is complex and the equipment is too heavy. 3. The amount of fire extinguishing agent used is large and the fire extinguishing efficiency is low, resulting in a large weight of fire extinguishing agent that needs to be carried. Summary of the invention

[0004] To overcome the problems existing in the related art, the exemplary embodiments of the present disclosure provide a fire extinguishing system and a fire extinguishing method.

[0005] An exemplary embodiment of the first aspect of the present disclosure provides a fire extinguishing system, comprising: a liquid container for storing liquid fire extinguishing material; a gas container for compressing and storing gas fire extinguishing material; one or more spray guns for spraying the liquid fire extinguishing material and the gas fire extinguishing material; a pneumatic pump connected to the liquid container, the gas container and each of the spray guns through multiple pipelines, respectively, and used to transport the liquid fire extinguishing material and the gas fire extinguishing material to each of the spray guns and spray them through the pressure of the gas fire extinguishing material in the gas container; and multiple one-way valves, respectively arranged in each of the pipelines.

[0006] In some embodiments, the pneumatic pump includes: a shell, which is divided into a plurality of chambers, each of which is connected to the liquid container or the gas container, and each of which is connected to the spray gun; a piston, which is arranged in the shell and can move back and forth in the shell under the pressure of the gas fire extinguishing material in the gas container to change the volume of each of the chambers.

[0007] In some embodiments, the multiple chambers include: a first chamber, a second chamber, a third chamber and a fourth chamber; the pneumatic pump also includes: a partition fixed to the middle of the shell, dividing the shell into chamber A and chamber B; the piston is vertically penetrated by the partition and is slidably and sealedly connected to the partition, and can reciprocate in a direction perpendicular to the partition; the piston is located at one end of the chamber A and is provided with a first piston plate parallel to the partition and slidably sealed with the shell, the first piston plate divides the chamber A into the first chamber close to the partition and the second chamber away from the partition, the piston is located at one end of the chamber B and is provided with a second piston plate parallel to the partition and slidably sealed with the shell, the second piston plate divides the chamber B into the third chamber close to the partition chamber and the fourth chamber away from the partition; the gas container is connected with two of the first chamber, the second chamber, the third chamber and the fourth chamber through the pipeline as the first air chamber and the second air chamber, and when the volume of the first air chamber is expanded, the volume of the second air chamber is correspondingly reduced; the liquid container is connected with two chambers of the first chamber, the second chamber, the third chamber and the fourth chamber that are not connected with the gas container through the pipeline, as the first liquid chamber and the second liquid chamber, and when the volume of the first air chamber is expanded, the volume of the first liquid chamber is correspondingly reduced; each of the spray guns is connected with at least one of the first air chamber and the second air chamber through the pipeline, and is connected with at least one of the first liquid chamber and the second liquid chamber.

[0008] In some embodiments, in a balanced state, the volumes of the first chamber, the second chamber, the third chamber, and the fourth chamber are the same.

[0009] In some embodiments, there is one spray gun, which is connected to the first air cavity, the second air cavity, the first liquid cavity and the second liquid cavity through pipelines respectively, and is used to spray the gas-liquid mixture composed of the liquid fire extinguishing material and the gas fire extinguishing material; or, there are two spray guns, one of which is connected to the first air cavity and the first liquid cavity, and the other is connected to the second air cavity and the second liquid cavity; or, there are two spray guns, one of which is connected to the first air cavity and the second liquid cavity, and the other is connected to the second air cavity and the first liquid cavity.

[0010] In some embodiments, the volume of the pneumatic pump is greater than or equal to 1 L; the initial gas pressure in the gas container is greater than or equal to 2.5 MPa.

[0011] In some embodiments, the gas container includes a pressure-increasing device for maintaining the initial gas pressure after the gas container discharges the gas fire-extinguishing material.

[0012] In some embodiments, the pneumatic pump further comprises an elastic reset mechanism connected to the piston.

[0013] In some embodiments, the liquid fire extinguishing material is water, and the gaseous fire extinguishing material is a halogenated alkane material; or, the liquid fire extinguishing material is perfluorohexanone, and the gaseous fire extinguishing material is nitrogen and / or carbon dioxide.

[0014] In a second aspect, according to some other exemplary embodiments, the present disclosure further provides a fire extinguishing method, comprising: delivering the liquid fire extinguishing material and the gas fire extinguishing material to each of the spray guns respectively and spraying them by means of the pressure of the gas fire extinguishing material in the gas container.

[0015] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: through gas-liquid mixed injection, the cooling effect can be improved to avoid re-ignition; the fire extinguishing effect can be improved, and the amount of fire extinguishing agent can be saved, thereby reducing the storage amount of fire extinguishing agent and reducing the weight of the system; there is no need for too many pump groups, which simplifies the system and reduces the overall weight.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present disclosure may be better understood by describing exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a schematic diagram of a fire extinguishing system according to an exemplary embodiment of the disclosure;

[0019] Figure 2 is a schematic diagram of a pneumatic pump structure of a fire extinguishing system according to an exemplary embodiment of the disclosure;

[0020] Figure 3 is a schematic diagram of a fire extinguishing system according to an exemplary embodiment of the disclosure;

[0021] Figure 4 is a cross-sectional schematic diagram of a fire extinguishing system according to an exemplary embodiment of the disclosure;

[0022] Figure 5 is a schematic diagram of a spray gun structure of a fire extinguishing system according to an exemplary embodiment of the disclosure;

[0023] Figure 6 The invention is a schematic cross-sectional view of a spray gun of a fire extinguishing system according to an exemplary embodiment of the disclosure. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present disclosure will be described below. It should be noted that in the specific description of these implementation methods, in order to provide a concise description, it is impossible for this specification to provide a detailed description of all the features of the actual implementation methods. It should be understood that in the actual implementation of any implementation method, just as in the process of any engineering project or design project, in order to achieve the specific goals of the developer and to meet system-related or business-related restrictions, various specific decisions are often made, and this will also change from one implementation method to another. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for ordinary technicians in the field related to the content disclosed by the present disclosure, some changes in design, manufacturing or production based on the technical content disclosed in the present disclosure are just conventional technical means, and should not be understood as insufficient content of the present disclosure.

[0025] Unless otherwise defined, the technical or scientific terms used in the claims and the specification shall have the usual meaning understood by persons with ordinary skills in the technical field to which the present disclosure belongs. The words "first", "second" and similar words used in the patent application specification and the claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "one" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalent elements, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0026] In order to solve the above technical problems, Figure 1 As shown, the present disclosure provides a fire extinguishing system 100 , which may include: a liquid container 110 , a gas container 120 , one or more spray guns 130 , a pneumatic pump 140 , a plurality of pipes 150 for connection, and a plurality of one-way valves 160 .

[0027] Among them, the liquid container 110 can be used to store liquid fire extinguishing materials, the gas container 120 can be used to compress and store gas fire extinguishing materials, and one or more spray guns 130 can be used to spray liquid fire extinguishing materials and gas fire extinguishing materials. The fire extinguishing system 100 disclosed in the present invention can use a gas-liquid mixture to extinguish a fire. Through the spray gun 130, the gas-liquid mixture is sprayed to produce a mist effect, and physical cooling can be performed efficiently to avoid the re-ignition caused by high temperature after the fire is extinguished and the spraying is stopped. And spraying by gas-liquid mixture can also save the amount of fire extinguishing agent. Compared with the method of simple liquid fire extinguishing, the reserve amount of liquid fire extinguishing materials can be reduced, thereby reducing the overall weight of the system. In the fields of new energy vehicles, new energy aircraft, etc., saving weight can improve the vehicle's endurance, load-bearing capacity, etc.

[0028] The pneumatic pump 140 can be connected to the liquid container 110, the gas container 120 and each spray gun 130 through a plurality of pipelines 150, and is used to deliver the liquid fire extinguishing material and the gas fire extinguishing material to each spray gun 130 and spray them through the pressure of the gas fire extinguishing material in the gas container 120. In the embodiment of the present disclosure, the pneumatic pump 140 is used to pump the liquid fire extinguishing material and the gas fire extinguishing material to the spray gun 130, and spray them through the spray gun 130. The power source of the pneumatic pump 140 can be the air pressure of the compressed gas. The pneumatic pump 140 can be connected to the gas container 120 through the pipeline 150. The gas container 120 stores compressed gas. When the gas container 120 ventilates the pneumatic pump 140, the gas fire extinguishing material is released from the gas container 120 to the pneumatic pump 140 based on the pressure of the compressed gas itself. The air pressure can be converted into energy, so that the liquid fire extinguishing material in the liquid container 110 can be extracted from the liquid container 110 and delivered to the spray gun 130, and the gas fire extinguishing material can also be delivered to the spray gun 130. Similarly, based on the energy of the gas pressure, the liquid fire extinguishing material and the gas fire extinguishing material can be sprayed from the spray gun 130 to achieve fire extinguishing.

[0029] The gas container 120 is used to store the gas fire extinguishing material in the form of compressed gas. By compressing the gas under normal pressure, the storage space efficiency can be improved and a large amount of gas storage space can be saved. The gas fire extinguishing material in the gas container 120 can be a high-pressure gas, which can restore the gas volume under normal pressure when released, and the released pressure can be converted into a driving force. In some cases, the compressed gas can also be stored in a liquid state in the gas container 120. Some gases are liquefied into a liquid state after being compressed to a certain proportion, and can be restored to a gaseous state after the container is opened. The system can be simplified by driving the fire extinguishing agent to be delivered and sprayed by the pressure internal energy of the compressed gas. There is no need to set a pump in the liquid container 110 and the gas container 120 to extract and transport the liquid fire extinguishing material and the gas fire extinguishing material. The volume and overall weight of the fire extinguishing system 100 can also be reduced, saving the space and weight of the new energy vehicle, and improving the vehicle's endurance and load-bearing capacity.

[0030] In the disclosed embodiment, the fire extinguishing system 100 also includes a plurality of one-way valves 160, which may be respectively arranged in each pipeline 150, so as to avoid the backflow of liquid fire extinguishing materials and gas fire extinguishing materials, so that when the pneumatic pump extracts and transports liquid fire extinguishing materials and gas fire extinguishing materials through the pressure of compressed gas, it can convert the internal energy of the released gas fire extinguishing materials into energy that is transported and sprayed toward the spray gun 130, thereby realizing the transport and ensuring the spraying of the fire extinguishing agent.

[0031] Through the fire extinguishing system 100 of the embodiment of the present disclosure, the fire is extinguished by mixing gas and liquid, which can improve the fire extinguishing efficiency and fire extinguishing effect, effectively physically reduce the temperature, and avoid re-ignition. And by mixing gas and liquid and spraying in a mist form, it is possible to save fire extinguishing materials, thereby reducing the liquid fire extinguishing materials and gas fire extinguishing materials that need to be stored, reducing the volume of the container, and effectively reducing the weight of new energy vehicles, new energy aircraft, etc. In addition, the fire extinguishing system 100 of the present disclosure drives the pneumatic pump 140 for conveying and spraying liquid fire extinguishing materials and gas fire extinguishing materials through the pressure of compressed gas, and there is no need to use multiple separate pumps such as centrifugal pumps to extract and convey liquid fire extinguishing materials and gas fire extinguishing materials, thereby reducing the complexity of the fire extinguishing system 100 and reducing the overall weight.

[0032] In some embodiments, the pneumatic pump 140 may include a housing and a piston. The space in the housing may be divided into a plurality of chambers, each of which is sealed from each other. The piston may be disposed in the housing, and may reciprocate in the housing under the pressure of the gas fire extinguishing material in the gas container 120 to change the volume of each chamber. Each chamber may increase or decrease in volume under the drive of compressed gas. Each chamber may be connected to the liquid container 110 or the gas container 120, and each chamber may be connected to the spray gun 130. Among them, regarding the chamber connected to the gas container 120, since the gas container 120 stores the gas fire extinguishing material in a compressed manner, the pressure in the gas container 120 is large. When the chamber is connected to the gas container 120, the gas fire extinguishing material in the gas container 120 is discharged into the chamber under the action of pressure, thereby increasing the pressure in the chamber, thereby being able to push the piston to move and expand the volume of the chamber. At the same time, since the shell of the pneumatic pump 140 is a rigid shell, the total internal volume remains unchanged. When a chamber is pressurized and the volume is increased by connecting to the gas container 120, the volume of another one or more chambers is reduced accordingly. The chamber with the reduced volume discharges the liquid fire extinguishing material or gas fire extinguishing material inside the chamber to the outside. Since a one-way valve 160 is provided on the pipeline 150, the liquid fire extinguishing material or gas fire extinguishing material discharged from the chamber will not return to the liquid container 110 or the gas container 120, so that the liquid fire extinguishing material or gas fire extinguishing material already in the chamber can be discharged to the spray gun 130 and sprayed. Specifically, the one-way valve 160 between the liquid container 110 and the pneumatic pump 140 only allows liquid to flow from the liquid container 110 to the pneumatic pump 140; the one-way valve 160 between the gas container 120 and the pneumatic pump 140 only allows gas to flow from the gas container 120 to the pneumatic pump 140; the one-way valve 160 between the pneumatic pump 140 and the spray gun 130 only allows gas or liquid to flow to the spray gun 130. In the absence of a fire, all the one-way valves 160 can be in a closed state, and all the pipelines 150 are in a disconnected state. In the event of a fire, the one-way valve 160 between the gas container 120 and the pneumatic pump 140 can be selectively opened and closed, and opened when compressed gas needs to be introduced, and otherwise kept closed to cut off the air intake channel of the pneumatic pump 140.

[0033] In some embodiments, the liquid fire extinguishing material is water, and the gas fire extinguishing material is a halogenated alkane material. At present, the electric energy of hybrid power mainly comes from large lithium batteries, and lithium iron phosphate is mainly used. Lithium iron phosphate is prone to thermal runaway in the presence of an ignition source, which in turn causes a fire. In terms of fire extinguishing of large lithium iron phosphate batteries, halogenated alkane fire extinguishing agents are used. The application of halogenated alkanes can effectively reduce the combustion heat of the battery and effectively extinguish the fire of lithium iron phosphate batteries. Halogenated alkane gas fire extinguishing agents mainly block the chain reaction in combustion through chemical mechanisms, but the chemical inhibition effect of halogenated alkanes tends to saturation when the amount of fire extinguishing agent is high, and further increasing the amount of fire extinguishing agent is not conducive to the fire extinguishing of large power batteries. In addition, due to the poor cooling effect of gas fire extinguishing agents, the battery temperature still rises sharply after the fire extinguishing agent is used up, and there is a hidden danger of re-ignition. The disclosed embodiment adopts a gas-liquid mixture to extinguish the fire, giving play to the dual effects of chemical inhibition and physical cooling of the fire extinguishing agent, avoiding the concentration saturation of a single fire extinguishing agent and the occurrence of battery re-ignition.

[0034] In other embodiments, the liquid fire extinguishing material is perfluorohexanone, and the gaseous fire extinguishing material is nitrogen and / or carbon dioxide. The amount of perfluorohexanone can be 2.8 to 3.0 g / W·h. Perfluorohexanone is easy to transport, has good compatibility, is clean and environmentally friendly, has high fire extinguishing efficiency, and is low in toxicity. It can be used in conjunction with nitrogen and carbon dioxide for gas-liquid mixed injection to improve fire extinguishing efficiency.

[0035] In some embodiments, the fire extinguishing system 100 drives the spraying of gas-liquid mixed fire extinguishing materials through the reciprocating movement of the piston, and the spraying process is generally continuous spraying. At the same time, since the movement of the piston is periodic, and the liquid gas inventory in the spraying process pipeline 150 also has periodic changes, when the fire is extinguished by the fire extinguishing system 100, the spraying amount of the spray gun 130 also has certain periodic changes. This periodic change can improve the efficiency of fire extinguishing. Compared with continuous spraying, less fire extinguishing agent (liquid fire extinguishing material and gas fire extinguishing material) is consumed. On the other hand, periodic spraying can more effectively reduce the battery temperature, reduce the production of CO and CO2 and reduce the heat release rate than continuous application, and more effectively extinguish the fire of lithium iron phosphate battery. Therefore, through the fire extinguishing system 100 provided by the present disclosure, a better spray fire extinguishing efficiency can be obtained.

[0036] In some embodiments, Figure 2 As shown, the piston may include a first piston 2421 and a second piston 2422. The first piston 2421 and the second piston 2422 divide the pneumatic pump 240 into three chambers, namely a first air chamber 2451, a second air chamber 2452 and a middle liquid chamber 2453. The pneumatic pump 240 may also include an elastic reset mechanism 270 connected to the piston. The elastic reset mechanism 270 may be disposed between the first piston 2421 and the second piston 2422 (eg, Figure 2As shown), it is possible to drive the piston to move in the direction of the equilibrium position when the piston deviates from the equilibrium position. The equilibrium position may be the position of the piston when the pressures in each chamber are the same. The elastic reset mechanism 270 may be used to expand the volume of the middle liquid chamber 2453 after the middle liquid chamber 2453 is compressed. When the volume of the middle liquid chamber 2453 decreases, the elastic reset mechanism 270 is compressed. The elastic reset mechanism 270 may also be arranged in the first air chamber 2451 and the second air chamber 2452, and when the volume of the middle liquid chamber 2453 decreases, the elastic reset mechanism 270 is stretched. In this embodiment, the first air chamber 2451 and the second air chamber 2452 may be respectively connected to the gas container 120 through the pipeline 150, the middle liquid chamber 2453 is connected to the liquid container 110 through the pipeline 150, and the first air chamber 2451, the middle liquid chamber 2453 and the second air chamber 2452 are all connected to the spray gun 130 through the pipeline 150. A one-way valve 160 is provided on each pipeline 150. Specifically, a first air inlet valve is provided on the pipeline 150 between the first air cavity 2451 and the gas container 120, and a first air outlet valve is provided on the pipeline 150 between the first air cavity 2451 and the spray gun 130; a second air inlet valve is provided on the pipeline 150 between the second air cavity 2452 and the gas container 120, and a second air outlet valve is provided on the pipeline 150 between the second air cavity 2452 and the spray gun 130; a first liquid inlet valve is provided on the pipeline 150 between the middle liquid cavity 2453 and the liquid container 110, and a first liquid outlet valve is provided on the pipeline 150 between the middle liquid cavity 2453 and the spray gun 130. In the present embodiment, the first liquid inlet valve and the first liquid outlet valve can be kept in a normally open state when extinguishing a fire. When the first air chamber 2451 is inflated, the first air inlet valve is opened, the first exhaust valve is closed, and the second air inlet valve is closed. The compressed gas is discharged into the first air chamber 2451 based on its own pressure, so that the internal pressure of the first air chamber 2451 increases, thereby pushing the first piston 2421 to Figure 2 The first piston 2421 moves downward in the middle of the liquid chamber 2453, so that the volume of the first air chamber 2451 is expanded, so that under the push of the first piston 2421, the liquid in the middle liquid chamber 2453 and the gas in the second air chamber 2452 are discharged, and mixed spraying is performed through the spray gun 130, and the elastic reset mechanism 270 is compressed. After that, the first air inlet valve can be closed, and the first exhaust valve can be opened. Under the elastic force of the elastic reset mechanism 270, the volume of the middle liquid chamber 2453 is expanded, so that the liquid enters the middle liquid chamber 2453 from the liquid container 110. The second air inlet valve is opened, and the second exhaust valve is closed to inflate the second air chamber 2452, and the exhaust of the first air chamber 2451 and the discharge of the liquid in the middle liquid chamber 2453 are completed accordingly. The above process is repeated and alternated, and the gas pressure of the gas container 120 is used to drive the pneumatic pump 240 to achieve gas-liquid mixed fire extinguishing, without the need to set up extra power devices such as pumps, saving system components, reducing system complexity, and reducing system weight.

[0037] In some embodiments, Figure 3 , Figure 4 As shown, the multiple chambers may include: a first chamber 4441, a second chamber 4442, a third chamber 4443 and a fourth chamber 4444. The pneumatic pump may include: a partition 443, fixed to the middle of the housing 441, dividing the housing 441 into chamber A and chamber B; a piston 442 may be an I-shaped piston, vertically penetrated through the partition 443 and slidably sealed with the partition 443, and capable of moving in a direction vertical to the partition 443 (such as Figure 4 The piston 442 can reciprocate under the drive of the compressed gas in the gas container 120. The piston 442 is located at one end of the chamber A and is provided with a first piston plate 4421 which is parallel to the partition 443 and is slidably sealed with the shell 441. The first piston plate 4421 divides the chamber A into a first chamber 4441 close to the partition 443 and a second chamber 4442 far from the partition 443. The piston 442 is located at one end of the chamber B and is provided with a second piston plate 4422 which is parallel to the partition 443 and is slidably sealed with the shell 441. The second piston plate 4422 divides the chamber B into a third chamber 4443 close to the partition 443 and a fourth chamber 4444 far from the partition 443. By setting four chambers, two of which are used as gas chambers and the other two as liquid chambers, the liquid and gas can be more efficiently introduced and discharged, the efficiency of gas-liquid mixed injection is higher, and the fire extinguishing effect is better. In some embodiments, the pneumatic pump 140 may further include two elastic reset mechanisms 270 ( Figure 4 The elastic return mechanism 270 is connected to the piston 442. One elastic return mechanism 270 can be arranged in the first chamber 4441, between the first piston plate 4421 and the housing 441, and another elastic return mechanism 270 can be arranged in the fourth chamber 4444, between the second piston plate 4422 and the housing 441; or, one elastic return mechanism 270 can be arranged in the second chamber 4442, between the first piston plate 4421 and the partition plate 443, and another elastic return mechanism 270 can be arranged in the third chamber 4443, between the second piston plate 4422 and the partition plate 443. The I-shaped piston is assisted to return to its original position by elastic force.

[0038] The gas container 120 is connected to two of the first chamber 4441, the second chamber 4442, the third chamber 4443 and the fourth chamber 4444 through the pipeline 150 as the first air chamber 4451 and the second air chamber 4452, and when the volume of the first air chamber 4451 is expanded, the volume of the second air chamber 4452 is reduced accordingly. The two gas-connected chambers can be alternately expanded and reduced, thereby alternately pushing the movement of the piston 442, so that the air intake, exhaust, liquid intake and liquid discharge of the pneumatic pump 140 can be synchronously realized during the reciprocating movement of the piston 442; on the other hand, the specific two chambers as the gas-connected chambers can be determined according to the actual spatial distribution requirements. The liquid container 110 is connected to two chambers of the first chamber 4441, the second chamber 4442, the third chamber 4443 and the fourth chamber 4444 that are not connected to the gas container 120 through the pipeline 150, as the first liquid chamber 4453 and the second liquid chamber 4454, and when the volume of the first gas chamber 4451 is expanded, the volume of the first liquid chamber 4453 is correspondingly reduced. Each spray gun 130 is connected to at least one of the first gas chamber 4451 and the second gas chamber 4452 through the pipeline 150, and is connected to at least one of the first liquid chamber 4453 and the second liquid chamber 4454.

[0039] In some embodiments, Figure 4 As shown, the two middle chambers are used as chambers for communicating gas, respectively, and the two chambers at both ends are used as chambers for communicating liquid. Specifically, the second chamber 4442 is used as the first gas chamber 4451, the third chamber 4443 is used as the second gas chamber 4452, the first chamber 4441 is used as the first liquid chamber 4453, and the fourth chamber 4444 is used as the second liquid chamber 4454. In this embodiment, the piston 442 can be driven to move back and forth by alternately inletting air into the two gas chambers to achieve the spraying of gas-liquid mixed fire extinguishing materials. In some cases, the reserve volume of the liquid fire extinguishing material in the fire extinguishing system 100 is larger than that of the compressed gas fire extinguishing material. Therefore, the volume of the liquid container 110 is larger than that of the gas container 120. In this embodiment, Figure 4As shown, the two chambers at both ends of the pneumatic pump 140 serve as chambers for connecting liquids, and the two chambers in the middle serve as chambers for connecting gas, which can improve space utilization, reduce the total length of the pipelines 150 required in the fire extinguishing system 100, reduce weight, and improve transportation efficiency. In the implementation process of fire extinguishing in this embodiment, the one-way valve 160 between the gas container 120 and the first air cavity 4451 and the second air cavity 4452 can be controlled to open and close to achieve alternating air intake, and the one-way valves 160 on the remaining pipelines 150 can all be kept in a normally open state, thereby reducing the complexity of the system and simplifying the control method. The exemplary description of the fire extinguishing process can be divided into a first state and a second state. In the first state, the one-way valve 160 between the first air cavity 4451 and the gas container 120 is opened, and the one-way valve 160 between the second air cavity 4452 and the gas container 120 is closed, so that the first air cavity 4451 is inflated, and the pressure in the first air cavity 4451 increases, pushing the piston 442 to Figure 4 At this time, the first liquid chamber 4453 is compressed and the volume is reduced, thereby discharging water to the spray gun 130; the second gas chamber 4452 is compressed and the volume is reduced, thereby discharging air to the spray gun 130; the volume of the second liquid chamber 4454 increases and the internal pressure decreases, thereby extracting liquid fire extinguishing material from the liquid container 110 into the second liquid chamber 4454 to achieve liquid inlet. In the second state, the one-way valve 160 between the second gas chamber 4452 and the gas container 120 is opened, and the one-way valve 160 between the first gas chamber 4451 and the gas container 120 is closed, so that the second gas chamber 4452 is inflated, the pressure in the second gas chamber 4452 increases, and the piston 442 is pushed to Figure 4 , at this time, the second liquid chamber 4454 is compressed, the volume is reduced, and the spray gun 130 is discharged; the first air chamber 4451 is compressed, the volume is reduced, and the spray gun 130 is exhausted; the volume of the first liquid chamber 4453 increases, and the internal pressure decreases, so that the liquid fire extinguishing material is drawn from the liquid container 110 into the first liquid chamber 4453 to achieve liquid filling. During the above-mentioned first state, the pneumatic pump 140 simultaneously completes liquid filling, liquid discharge, air intake and exhaust; similarly, during the second state, the pneumatic pump 140 also simultaneously completes liquid filling, liquid discharge, air intake and exhaust. Therefore, driven by the pressure of the compressed gas itself, the pneumatic pump 140 can spray gaseous fire extinguishing materials and liquid fire extinguishing materials, ensuring that while extinguishing the fire, the extraction and transportation of liquid and gas are completed efficiently and concisely, and the system is simple and low in weight.

[0040] In some embodiments, the alternating frequency of air intake of the first air cavity 4451 and the second air cavity 4452 may be 2Hz-4Hz, that is, the time from the start of air intake in the first air cavity 4451 to the stop of air intake in the first air cavity 4451 and the start of air intake in the second air cavity 4452 is 0.25s-0.5s. After the first air cavity 4451 starts to take in air, the piston 442 is pushed to the maximum volume point by the air pressure in the gas container 120 from the minimum volume point, and the time taken is 0.25s-0.5s, which is also a spraying cycle of the spray gun 130. The alternating frequency ensures that each air intake makes the corresponding gas chamber reach the maximum volume, thereby ensuring the air intake efficiency. On the other hand, after reaching the maximum volume, it switches to perform a new air intake and spraying process, thereby achieving efficient fire extinguishing. In other embodiments, a stroke or position sensor may be provided to control the air intake by the moving distance or position of the piston 442. When the piston 442 moves a preset distance or moves to a preset position, that is, when the air intake of the gas chamber reaches the maximum volume, the air intake check valve 160 of one of the air chambers is closed and the other is opened. In still other embodiments, a flow meter may be provided on the pipeline 150 between the first air chamber 4451 and the gas container 120, and on the pipeline 150 between the second air chamber 4452 and the gas container 120, to confirm the timing of alternating air intake according to the gas flow rate. By controlling the alternating air intake, the efficiency of the compressed gas driving the pneumatic pump 140 can be improved, the effect of gas-liquid mixed injection can be ensured, and thus the fire extinguishing effect can be ensured.

[0041] In some embodiments, the two chambers at both ends can be used as chambers for connecting gas, and the two chambers in the middle can be used as chambers for connecting liquid. Specifically, the first chamber 4441 can be used as the first air chamber, the fourth chamber 4444 can be used as the second air chamber, the second chamber 4442 can be used as the first liquid chamber, and the third chamber 4443 can be used as the second liquid chamber. In this embodiment, the middle chamber is used as a chamber for connecting liquid, and the chambers at both ends are used as chambers for connecting gas, which can be applied to other specific assembly scenarios. For example, when the space of the plane is limited, the liquid container 110 can be set close to the pneumatic pump 140, and two gas containers 120 can be set, which are respectively located at both ends of the pneumatic pump 140 and are respectively connected to the first air chamber and the second air chamber of the pneumatic pump 140. In other embodiments, the first chamber 4441 can be used as the first air chamber, the second chamber 4442 can be used as the second air chamber, the third chamber 4443 can be used as the first liquid chamber, and the fourth chamber 4444 can be used as the second liquid chamber. In this embodiment, the two chambers on one side of the partition 443 are used as chambers connected to the liquid, and the two chambers on the other side of the partition 443 are used as chambers connected to the gas, which can be applicable to other specific assembly scenarios. For example, in some assembly scenarios, the gas container 120 and the liquid container 110 need to be arranged longitudinally (piston movement direction) with the pneumatic pump 140, then the gas container 120 can be set at one end of the pneumatic pump 140, and the gas container 120 is connected to the two chambers close to the pneumatic pump 140, and the liquid container 110 is set at the other end of the pneumatic pump 140, and the liquid container 110 is connected to the two chambers close to the pneumatic pump 140, so as to match the actual assembly scenario. The fire extinguishing process of the above two embodiments is the same as the fire extinguishing principle of the aforementioned embodiment, both of which drive the piston to move by alternately intake air into the first air cavity and the second air cavity, and during the process of intake air into the first air cavity and the process of intake air into the second air cavity, the pneumatic pump 140 simultaneously completes the processes of liquid intake, liquid discharge, air intake and exhaust, and can efficiently spray gas-liquid mixed fire extinguishing materials, ensure fire extinguishing efficiency and effect, and reduce the complexity and weight of the system.

[0042] In some embodiments, the volume of the pneumatic pump 140 may be greater than or equal to 1L; the initial gas pressure in the gas container 120 may be greater than or equal to 2.5MPa. By compressing the gas, the gas in the gas container 120 is kept at a high pressure. When the corresponding one-way valve 160 is opened, the gas can be discharged into the pneumatic pump 140 without the need for other power sources, and can drive the piston to move, and simultaneously realize air intake, exhaust, liquid intake, and liquid discharge. The weight of the system is reduced. The volume of the pneumatic pump can be greater than or equal to 1L, which can ensure that the amount of the sprayed fire extinguishing agent is sufficient.

[0043] In some embodiments, the volume V of the pneumatic pump 140 may be in the range of 1L≤V≤2L, and the difference between the maximum volume and the minimum volume of a gas chamber, such as the first gas chamber or the second gas chamber, that is, the single air intake volume is 0.5L-1L; the initial air pressure P in the gas container 120 may be in the range of 2.5MPa≤P≤4.2MPa. In this way, the injection volume of a single air intake cycle is guaranteed while avoiding insufficient driving force of air pressure caused by excessive volume.

[0044] In some embodiments, in a balanced state, the volumes of the first chamber 4441, the second chamber 4442, the third chamber 4443, and the fourth chamber 4444 may be the same. In the disclosed embodiment, the volume ratio of each chamber may be set so that the volume of each chamber is substantially the same, so that the volume ratio of the liquid fire extinguishing material and the gas fire extinguishing material sprayed each time is close to 1:1, which can better extinguish the fire, and can also ensure that the injection requirements can be met under the drive of compressed gas to avoid system failure.

[0045] In some embodiments, the volume of the liquid container 110 is two times or more than the volume of the gas container 120. Since the gaseous fire extinguishing material is stored in the gas container 120 in the form of compressed gas, on the one hand, space is saved, and on the other hand, the pneumatic pump 140 is driven by the pressure of the compressed gas to realize the transportation and injection of the liquid fire extinguishing material and the gaseous fire extinguishing material. Setting the volume of the liquid container 110 to be two times or more than the volume of the gas container 120 can ensure that the consumption speed of the liquid fire extinguishing material and the gas fire extinguishing material is basically the same during the gas-liquid mixed injection, and the liquid container 110 and the gas container 120 can be emptied at basically the same time. This avoids the situation where there is still fire extinguishing agent in one container while the other container has been emptied, thereby reducing the ineffective carrying capacity of the fire extinguishing agent.

[0046] In some exemplary embodiments, the total volume V of the pneumatic pump 140 may be in the range of 1L≤V≤2L, the initial gas pressure P in the gas container 120 may be in the range of 2.5MPa≤P≤4.2MPa, the volume VG of the gas container 120 may be in the range of 3.8L≤VG≤10L, and the volume VL of the liquid container 110 may be in the range of 7.6L≤VL≤20L. The fire extinguishing system 100 of the disclosed embodiment can effectively reduce the overall occupied space size and reduce the system weight.

[0047] In some embodiments, there may be one spray gun 130, which is connected to the first air cavity, the second air cavity, the first liquid cavity, and the second liquid cavity through the pipeline 150, respectively, and is used to spray a gas-liquid mixture composed of liquid fire extinguishing materials and gas fire extinguishing materials. In this embodiment, during the inflation of the first air cavity, the second air cavity and the first liquid cavity respectively discharge gas fire extinguishing materials and liquid fire extinguishing materials to the spray gun 130, and spray through the spray gun 130. During the inflation of the second air cavity, the first air cavity and the second liquid cavity respectively discharge gas fire extinguishing materials and liquid fire extinguishing materials to the spray gun 130, and spray through the spray gun 130. In the disclosed embodiment, the spray gun 130 can realize gas-liquid mixed injection, thereby improving the fire extinguishing efficiency. One spray gun 130 can maintain the injection pressure of liquid and gas, and can improve the injection efficiency, including the injection distance. The effect of intermittent injection can also be achieved by controlling the inflation timing of the first air cavity and the second air cavity.

[0048] In some embodiments, Figure 5 , Figure 6 As shown, the spray gun 130 may include an axial spray outlet 131 and multiple radial spray outlets 131. A swirl groove is provided at the position of each spray outlet 131, so that a mist spray effect can be better formed. By providing the spray outlets 131 at multiple positions, a water mist covering the fire position can be formed, which can improve the fire extinguishing efficiency.

[0049] In some embodiments, Figure 3 , Figure 4 As shown, there can be two spray guns 130, one of which is connected to the first air cavity and the first liquid cavity, and the other is connected to the second air cavity and the second liquid cavity. In this embodiment, the two spray guns 130 can spray at the same time, the two spray guns 130 can be set at different positions, and the spray angles can be the same or different, and the coverage position can be adjusted as needed. A spray gun 130 is connected to the first air cavity and the first liquid cavity. When the first air cavity delivers gaseous fire extinguishing material to the spray gun 130, the first liquid cavity is in a liquid intake state and does not discharge liquid to the spray gun 130, while the pipeline 150 still contains the liquid fire extinguishing material discharged in the previous stage. The discharged gaseous fire extinguishing material can drive the liquid fire extinguishing material in the pipeline 150 to be mixed and sprayed together; correspondingly, when the first liquid cavity delivers liquid fire extinguishing material to the spray gun 130, the first air cavity is in an air intake state and does not exhaust gas to the spray gun 130, while the pipeline 150 contains the gaseous fire extinguishing material discharged in the previous stage. The liquid fire extinguishing material discharged from the first liquid cavity can drive the gas fire extinguishing material in the pipeline 150 to be mixed and sprayed together. The spraying method of the other spray gun 130 is the same. Through the two spray guns 130, the spraying is alternately carried out in the manner of gas driving liquid and liquid driving gas, which ensures the spraying efficiency and can spray from multiple positions.

[0050] In some embodiments, there are two spray guns 130, one of which is connected to the first air cavity and the second liquid cavity, and the other spray gun 130 is connected to the second air cavity and the first liquid cavity. In this embodiment, the exhaust of the first air cavity is synchronized with the drainage of the second liquid cavity, and the exhaust of the second air cavity is synchronized with the drainage of the first liquid cavity, so that the injection pressure is better, the spray distance of the water mist is farther, and the mist formed by the mixture is more complete. In addition, when one spray gun 130 is spraying, the two chambers connected to the other spray gun 130 do not exhaust or drain to the outside, so that each spray gun 130 can spray intermittently, thereby forming intermittent spraying, and the air intake time of the first air cavity and the second air cavity is the same, that is, the air intake time is the same, so that the time of spraying and the time of non-spraying of the two spray guns 130 are basically the same, and the duty cycle (the proportion of the spraying time to the total spraying time) reaches about 50%, reducing the production of CO and CO2 and reducing the heat release rate, thereby obtaining a better spray fire extinguishing efficiency.

[0051] In some embodiments, the gas container 120 may include a pressurizing device for maintaining the initial gas pressure after the gas fire extinguishing material is discharged from the gas container 120. In the embodiment of the present disclosure, the gas container 120 may be provided with a pressurizing device, for example, an elastic device is provided in the container to push the piston, and after the gas is discharged, the elastic force of the elastic device reduces the volume of the stored gas fire extinguishing material, thereby maintaining the gas pressure, so that even after a certain amount of gas is discharged, the piston driving the pneumatic pump 140 can still be guaranteed to reciprocate.

[0052] Based on the same inventive concept, the present disclosure also provides a fire extinguishing method, which can be applied to the fire extinguishing system 100 of any of the aforementioned embodiments. The fire extinguishing method may include: using the pressure of the gaseous fire extinguishing material in the gas container 120 to deliver the liquid fire extinguishing material and the gaseous fire extinguishing material to each spray gun 130 and spraying them. The pressure of the compressed gas in the gas container 120 drives the pneumatic pump 140 to deliver the liquid fire extinguishing material in the liquid container 110 to the spray gun 130, and can also deliver the gaseous fire extinguishing material, and spray the gas-liquid mixture through the spray gun 130. Through the fire extinguishing method of the embodiment of the present disclosure, mist fire extinguishing can be efficiently formed, the fire extinguishing efficiency and fire extinguishing effect can be improved, and the system and control method are simplified.

[0053] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0054] In the context of this application, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0055] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0056] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the embodiments of the present application.

Claims

1. A fire extinguishing system, comprising: Liquid containers for storing liquid fire extinguishing materials; Gas containers for compressed storage of gaseous fire extinguishing materials; One or more spray guns for spraying the liquid fire extinguishing material and the gas fire extinguishing material; A pneumatic pump, connected to the liquid container, the gas container and each of the spray guns through a plurality of pipelines, and used to transport the liquid fire extinguishing material and the gas fire extinguishing material to each of the spray guns for spraying by the pressure of the gas fire extinguishing material in the gas container; A plurality of one-way valves are respectively arranged on each of the pipelines.

2. The fire extinguishing system according to claim 1, wherein: The pneumatic pump comprises: A shell, wherein the shell is divided into a plurality of chambers, each of the chambers is communicated with the liquid container or the gas container, and each of the chambers is communicated with the spray gun; A piston is disposed in the housing and can reciprocate in the housing under the pressure of the gas fire extinguishing material in the gas container to change the volume of each chamber.

3. The fire extinguishing system according to claim 2, wherein: The plurality of chambers include: a first chamber, a second chamber, a third chamber, and a fourth chamber; The pneumatic pump further comprises: a partition plate fixed to the middle of the housing to separate the housing into chamber A and chamber B; The piston is vertically penetrated through the partition and is slidably sealed with the partition, and can reciprocate in a direction perpendicular to the partition; the piston is located at one end of the A chamber and is provided with a first piston plate parallel to the partition and slidably sealed with the shell, the first piston plate divides the A chamber into the first chamber close to the partition and the second chamber away from the partition; the piston is located at one end of the B chamber and is provided with a second piston plate parallel to the partition and slidably sealed with the shell, the second piston plate divides the B chamber into the third chamber close to the partition and the fourth chamber away from the partition; The gas container is connected to two of the first chamber, the second chamber, the third chamber and the fourth chamber through the pipeline to form a first air cavity and a second air cavity, and when the volume of the first air cavity is expanded, the volume of the second air cavity is reduced accordingly; The liquid container is connected to two chambers of the first chamber, the second chamber, the third chamber and the fourth chamber that are not connected to the gas container through the pipeline, respectively, as the first liquid chamber and the second liquid chamber, and when the volume of the first gas chamber is expanded, the volume of the first liquid chamber is correspondingly reduced; Each of the spray guns is communicated with at least one of the first air cavity and the second air cavity through the pipeline, and is communicated with at least one of the first liquid cavity and the second liquid cavity.

4. The fire extinguishing system according to claim 3, wherein: In a balanced state, the volumes of the first chamber, the second chamber, the third chamber, and the fourth chamber are the same.

5. The fire extinguishing system according to claim 3, wherein: The number of the spray gun is one, which is connected to the first air cavity, the second air cavity, the first liquid cavity and the second liquid cavity through pipelines respectively, and is used to spray the gas-liquid mixture composed of the liquid fire extinguishing material and the gas fire extinguishing material; or, There are two spray guns, one of which is connected to the first air cavity and the first liquid cavity, and the other is connected to the second air cavity and the second liquid cavity; or, There are two spray guns, one of which is connected to the first air cavity and the second liquid cavity, and the other is connected to the second air cavity and the first liquid cavity.

6. The fire extinguishing system according to claim 3, wherein: The volume of the pneumatic pump is greater than or equal to 1L; the initial gas pressure in the gas container is greater than or equal to 2.5MPa.

7. The fire extinguishing system according to claim 6, wherein: The gas container comprises a pressure increasing device for maintaining the initial gas pressure after the gas container discharges the gas fire extinguishing material.

8. The fire extinguishing system according to any one of claims 2 to 7, wherein: The pneumatic pump also includes an elastic reset mechanism connected to the piston.

9. The fire extinguishing system according to claim 1, wherein: The liquid fire extinguishing material is water, and the gaseous fire extinguishing material is a halogenated alkane material; or, the liquid fire extinguishing material is perfluorohexanone, and the gaseous fire extinguishing material is nitrogen and / or carbon dioxide.

10. A fire extinguishing method, applied to the fire extinguishing system according to any one of claims 1 to 9, the method comprising: The liquid fire extinguishing material and the gas fire extinguishing material are respectively delivered to each of the spray guns and sprayed by the pressure of the gas fire extinguishing material in the gas container.

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