A spring-equipped pulse-discharge aerosol fire extinguishing device and a fire extinguishing method

Abstract

The application discloses a spring-equipped pulse spraying type aerosol fire extinguishing device and a fire extinguishing method, which comprise a cylinder body and a fire extinguishing agent column arranged in the cylinder body, a front cover is arranged on the front side of the cylinder body, a spraying opening is formed in the surface of the front cover, the fire extinguishing agent column is connected with one end of a starting part, a piston in sliding cooperation with the cylinder body is arranged in the region between the fire extinguishing agent column and the spraying opening, a spring is arranged on the inner side of the cylinder body, a spraying pipe is vertically arranged on the inner side of the spring, the top of the spraying pipe is connected with the spraying opening, and the lower side of the spraying pipe is matched with a channel formed in the interior of the piston; the cooperation of the piston, the spring and the spraying pipe enables the fire extinguishing agent to be intermittently sprayed from the spraying opening, a continuous pulse spraying process can be realized, the pressure in the battery box is periodically increased and reduced, the combustible gas in the battery in the battery box can be completely discharged, and the risk of rekindling is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy battery fire extinguishing, and in particular to a pulse spraying aerosol fire extinguishing device provided with a spring and a fire extinguishing method. Background Art

[0002] At present, aerosol fire extinguishing devices are often installed in the battery compartment of new energy batteries to extinguish the fire of the batteries therein. When the battery has thermal runaway, a large amount of flammable gas escapes from the battery and enters the battery box (that is, the battery compartment where the battery is located). At this time, after the aerosol fire extinguishing device is activated, due to the large gas production of traditional aerosol fire extinguishing devices, the aerosol fire extinguishing agent will quickly fill the entire battery box. In this process, only part of the flammable gas is pushed out of the battery compartment. More flammable gas is often pressed inside the battery and cannot be completely discharged due to the large gas production of the aerosol fire extinguishing device when spraying, which causes the positive pressure in the battery compartment to be too high. Therefore, after the aerosol fire extinguishing device is sprayed, the pressure in the battery compartment drops, and a large amount of flammable gas escapes from the battery again. There is still a risk of re-ignition. Therefore, it is necessary to improve the traditional aerosol fire extinguishing device and design a fire extinguishing device that can continuously pulse spray so that the pressure in the battery box increases and decreases periodically, thereby solving the above problems. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a pulse spraying aerosol fire extinguishing device and a fire extinguishing method provided with a spring, which can realize a continuous pulse spraying process, so that the pressure in the battery box increases and decreases periodically, which is conducive to the complete discharge of the combustible gas inside the battery in the battery box and prevents the risk of re-ignition.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a pulse spraying aerosol fire extinguishing device provided with a spring, comprising a cylinder and a fire extinguishing agent column arranged in the cylinder, a front cover is provided on the front side of the cylinder, a nozzle is opened on the surface of the front cover, the fire extinguishing agent column is connected to one end of the starting component, the area between the fire extinguishing agent column and the nozzle is provided with a piston that slides with the cylinder, a spring is provided on the inside of the cylinder, a spraying pipe is vertically provided on the inside of the spring, the top of the spraying pipe is connected to the nozzle, and the lower side of the spraying pipe cooperates with the channel opened inside the piston.

[0005] Preferably, a rubber sealing plug is fixedly provided in the channel, and the lower side of the spray pipe is a pointed structure.

[0006] Preferably, a tear line is provided on the surface of the rubber sealing plug.

[0007] Preferably, the tear line is in a straight line or a cross shape.

[0008] Preferably, the front cover is threadedly connected to the top of the cylinder, and the bottom of the cylinder is threadedly connected to the rear cover.

[0009] Preferably, the fire extinguishing agent column is a column structure formed by pressing aerosol generating agent powder.

[0010] Preferably, the starting component is an electric ignition head or a thermal wire structure, and the end surface of the fire extinguishing agent column is connected to one end of the starting component.

[0011] Preferably, the spring is a compression spring, the top of which is connected to a retaining ring fixed inside the cylinder, and the bottom of which is connected to the top of the piston.

[0012] Preferably, a partition is further provided in the cylinder, a spray pipe is passed through the partition, and a coolant is provided in the area where the partition and the front cover are located.

[0013] In addition, the present invention also discloses a fire extinguishing method using the pulse spray aerosol fire extinguishing device, which comprises the following steps:

[0014] S1: When the battery in the battery box experiences thermal runaway, the starting component ignites the fire extinguishing agent column, which burns to produce gaseous fire extinguishing substances;

[0015] S2: As the gas production increases, the pressure in the area between the lower side of the piston and the fire extinguishing agent column gradually increases. Eventually, the gas thrust overcomes the friction between the piston and the cylinder and the elastic force of the spring, pushing the piston toward the lower end of the discharge pipe.

[0016] S3: When the piston moves to the lower end of the spray pipe and passes through the spray pipe and the rubber sealing plug, when the lower end of the spray pipe exceeds the lower side of the piston, the spray pipe connects the area under the piston with the nozzle, and the fire extinguishing material under the piston enters the nozzle along the spray pipe and is then sprayed out from the nozzle;

[0017] S4: After the gaseous fire extinguishing substance under the piston has been sprayed for a period of time, the gas thrust weakens. The spring is squeezed by the piston and compressed, generating a rebound force, which pushes the piston to move in the opposite direction, causing the piston to leave the rubber seal and the spray pipe. The area under the piston is separated from the spray pipe, and the fire extinguishing substance is blocked by the piston again, and stops spraying from the nozzle.

[0018] S5: Repeat steps S2 to S4, the piston periodically reciprocates, and the lower area of ​​the piston is periodically connected and disconnected with the nozzle, so that the fire extinguishing material is intermittently sprayed from the nozzle, realizing a pulsed spraying process;

[0019] S6: Fire extinguishing material is intermittently sprayed into the battery box from the nozzle. When the gaseous fire extinguishing material is sprayed into the battery box, the internal pressure of the battery box increases. When the fire extinguishing material stops spraying, the gas inside the battery box will be discharged from the gaps in the box body, causing the internal pressure of the battery box to decrease. Ultimately, the pressure in the battery box increases and decreases periodically.

[0020] S7: When the pressure inside the battery box increases, the combustible gas diluted by the fire extinguishing material will be pressed out from the gaps in the battery box. When the pressure inside the battery box decreases, the combustible gas inside the battery escapes and enters the battery box, and the above process is repeated.

[0021] Beneficial effects of the present invention:

[0022] The present invention uses the cooperation of the piston, spring and spray pipe to allow the fire extinguishing material to be sprayed intermittently from the nozzle, which can realize a continuous pulse spraying process, so that the pressure in the battery box increases and decreases periodically, which is beneficial to the complete discharge of the combustible gas inside the battery in the battery box and prevents the risk of re-ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the internal structure of a spring-equipped pulse spray aerosol fire extinguishing device;

[0024] Figure 2 It is a schematic diagram of the planar structure of a rubber sealing plug;

[0025] Figure 3 It is a schematic diagram of the planar structure of another rubber sealing plug. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 3 As shown, a pulse spray aerosol fire extinguishing device with a spring includes a cylinder 1 and a fire extinguishing agent column 2 arranged in the cylinder 1. A front cover 3 is provided on the front side of the cylinder 1, and a nozzle 4 is opened on the surface of the front cover 3. The fire extinguishing agent column 2 is connected to one end of the starting component 2.1. The area between the fire extinguishing agent column 2 and the nozzle 4 is provided with a piston 5 that slides with the cylinder 1. A spring 6 is provided on the inside of the cylinder 1. A spray pipe 7 is vertically provided inside the spring 6. The top of the spray pipe 7 is connected to the nozzle 4, and the bottom of the spray pipe 7 cooperates with a channel 8 opened in the piston 5.

[0028] Preferably, a rubber sealing plug 9 is fixedly installed in the channel 8, and the underside of the discharge pipe 7 has a pointed structure. In this embodiment, the rubber sealing plug 9 serves two purposes: first, it blocks the channel 8 when the discharge pipe 7 is not inserted into the channel 8, ensuring the tightness of the piston 5; second, it allows the discharge pipe 7 to pass through the rubber sealing plug 9 without obstructing its passage. Because the rubber sealing plug 9 is made of a rubber elastic material, once the discharge pipe 7 passes through it, it is unlikely to flow down the hole after the discharge pipe 7 exits, leaving only a linear gap. This still provides a certain sealing performance, meeting the pressure accumulation process on the underside of the piston 5.

[0029] Preferably, a tear line 10 is provided on the surface of the rubber sealing plug 9. By pre-setting the tear line 10, the spray pipe 7 can be more easily passed through the rubber sealing plug 9, and after the spray pipe 7 leaves, the tear line 10 returns to a linear gap, thereby ensuring a certain sealing performance.

[0030] Preferably, the tear line 10 is in the shape of a straight line or a cross. Figure 2 and 3 The rubber sealing plug 9 and the tear line 10 shown are respectively in the shape of a straight line and a cross.

[0031] Preferably, the front cover 3 is threadedly connected to the top of the cylinder 1, and the bottom of the cylinder 1 is threadedly connected to the back cover 11. Through this threaded connection, the installation of the cylinder 1, the front cover 3 and the back cover 11 is more convenient.

[0032] Preferably, the fire extinguishing agent charge 2 is a columnar structure formed by pressing aerosol generating agent powder. When the aerosol generating agent burns, it produces a large amount of gas, thereby pushing the piston 5 upward. In addition, the aerosol generating agent pressed into a columnar structure burns more slowly than the powdered aerosol generating agent, which can ensure the continuous release of the fire extinguishing agent.

[0033] Preferably, the starting component 2.1 is an electric ignition head or a thermal wire structure, and the end face of the fire extinguishing agent column 2 is connected to one end of the starting component 2.1. When the starting component 2.1 is an electric ignition head structure, it can be connected to a fire detection device, which is a temperature sensor and / or a smoke sensor. When a fire, overheating, or the like occurs, the fire detection device detects that a high temperature environment is generated in the battery compartment due to the fire, and sends a signal to the microprocessor, which controls the starting component 2.1 to ignite the fire extinguishing agent column 2. When the starting component 2.1 is a thermal wire structure, the thermal wire structure can be directly ignited when a fire occurs, and then the thermal wire directly ignites the fire extinguishing agent column 2, without the need for additional fire detection devices and other external equipment, which is simpler and less costly.

[0034] Preferably, the spring 6 is a compression spring, with its top connected to a retaining ring 12 fixed inside the cylinder 1 and its bottom connected to the top of the piston 5. The retaining ring 12 can easily limit the position of the spring 6. In addition, depending on the actual situation, the spring 6 can also be designed as a tension spring, so that the spring 6 is installed at the bottom of the piston 5 and the reciprocating movement of the piston 5 is achieved by the tension of the spring.

[0035] Preferably, a partition 13 is further provided in the barrel 1, and a spray pipe 7 is passed through the partition 13. A coolant 14 is provided in the area between the partition 13 and the front cover 3. The coolant 14 can cool the fire extinguishing material passing through the spray pipe 7, thereby preventing the nozzle 4 from overheating.

[0036] Preferably, a silica gel layer is provided on the outer surface of the fire extinguishing agent charge 2. The silica gel layer can effectively isolate the heat generated by the combustion of the fire extinguishing agent charge 2 and prevent the surface temperature of the cylinder 1 from being too high.

[0037] In addition, the present invention also discloses a fire extinguishing method using the pulse spray aerosol fire extinguishing device, which comprises the following steps:

[0038] S1: When the battery in the battery box experiences thermal runaway, the starting component 2.1 ignites the fire extinguishing agent column 2, which burns to produce gaseous fire extinguishing substances;

[0039] S2: As the gas production increases, the pressure in the area between the lower side of the piston 5 and the fire extinguishing agent column 2 gradually increases. Eventually, the gas thrust overcomes the friction between the piston 5 and the cylinder 1 and the elastic force of the spring 6, pushing the piston 5 toward the lower end of the discharge pipe 7.

[0040] S3: When the piston 5 moves to the lower end of the spray pipe 7 and passes through the spray pipe 7 and the rubber sealing plug 9, when the lower end of the spray pipe 7 exceeds the lower side of the piston 5, the spray pipe 7 connects the area under the piston 5 with the nozzle 4, and the fire extinguishing material under the piston 5 flows along the spray pipe 7 into the nozzle 4 and is then sprayed out from the nozzle 4;

[0041] S4: After the gaseous fire extinguishing substance under the piston 5 has been sprayed for a period of time, the gas thrust weakens, and the spring 6 is compressed by the piston 5 to generate a rebound force, thereby pushing the piston 5 to move in the opposite direction, causing the piston 5 to leave the rubber sealing plug 9 and the spray pipe 7. The area under the piston 5 is separated from the spray pipe 7, and the fire extinguishing substance is blocked by the piston 5 again, and stops spraying from the nozzle 4;

[0042] S5: Repeat steps S2 to S4, the piston 5 periodically reciprocates, and the lower area of ​​the piston 5 is periodically connected and disconnected with the nozzle 4, so that the fire extinguishing material is intermittently sprayed from the nozzle 4, realizing a pulsed spraying process;

[0043] S6: Fire extinguishing material is intermittently sprayed into the battery box from the nozzle 4; when the gaseous fire extinguishing material is sprayed into the battery box, the internal pressure of the battery box increases; when the fire extinguishing material stops spraying, the gas inside the battery box will be released and discharged from the gaps in the box body, so that the internal pressure of the battery box is reduced; finally, the pressure inside the battery box increases and decreases periodically; in this step, when the fire extinguishing material is sprayed from the nozzle 4 to extinguish the fire in the battery box, the gas inside the battery box increases, causing the pressure to increase; and when the fire extinguishing material stops spraying, the gas inside the battery box will be released and discharged from the gaps in the box body, so that the internal pressure of the battery box is reduced, so the pressure inside the battery box increases and decreases periodically.

[0044] S7: When the pressure inside the battery compartment increases, the flammable gas diluted with the fire extinguishing agent is forced out through the gaps in the battery compartment. When the pressure inside the battery compartment decreases, the flammable gas inside the battery escapes and enters the battery compartment, repeating the above process. Through this reciprocating cycle of low and high pressure, the majority of the flammable gas generated in the battery is diluted with the fire extinguishing agent and continuously discharged from the battery compartment, completing the entire fire extinguishing process and effectively preventing the risk of re-ignition.

[0045] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features in the embodiments of this application may be arbitrarily combined with each other unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A pulse spraying aerosol fire extinguishing device provided with a spring, comprising a cylinder (1) and a fire extinguishing agent column (2) arranged in the cylinder (1), a front cover (3) being provided on the front side of the cylinder (1), a nozzle (4) being provided on the surface of the front cover (3), the fire extinguishing agent column (2) being connected to one end of a starting component (2.1), and characterized in that: A piston (5) that is slidably engaged with the cylinder (1) is provided in the area between the fire extinguishing agent column (2) and the nozzle (4); a spring (6) is provided on the inner side of the cylinder (1); a spray pipe (7) is vertically provided on the inner side of the spring (6); the top of the spray pipe (7) is connected to the nozzle (4); the lower side of the spray pipe (7) is engaged with a channel (8) opened inside the piston (5); a rubber sealing plug (9) is fixedly provided in the channel (8); the lower side of the spray pipe (7) is a tip structure; the spring (6) is a compression spring, the top of which is connected to a retaining ring (12) fixed on the inner side of the cylinder (1), and the bottom of which is connected to the top of the piston (5).

2. The spring-loaded pulse spray aerosol fire extinguishing device according to claim 1, characterized in that: A tear line (10) is provided on the surface of the rubber sealing plug (9).

3. The spring-loaded pulse spray aerosol fire extinguishing device according to claim 2, characterized in that: The tear line (10) is in the shape of a straight line or a cross.

4. The spring-loaded pulse spray aerosol fire extinguishing device according to claim 1, characterized in that: The front cover (3) is threadedly connected to the top of the cylinder (1), and the bottom of the cylinder (1) is threadedly connected to the rear cover (11).

5. The spring-loaded pulse spray aerosol fire extinguishing device according to claim 1, characterized in that: The fire extinguishing agent column (2) is a column structure formed by pressing aerosol generating agent powder.

6. The spring-loaded pulse spray aerosol fire extinguishing device according to claim 1, characterized in that: The starting component (2.1) is an electric ignition head or a thermal wire structure, and the end face of the fire extinguishing agent column (2) is connected to one end of the starting component (2.1).

7. The spring-loaded pulse spray aerosol fire extinguishing device according to claim 1, characterized in that: A partition (13) is further provided in the cylinder (1), a spray pipe (7) is passed through the partition (13), and a coolant (14) is provided in the area where the partition (13) and the front cover (3) are located.

8. A fire extinguishing method using the pulse spray aerosol fire extinguishing device according to any one of claims 1 to 7, characterized in that: It includes the following steps: S1: When the battery in the battery box experiences thermal runaway, the starting component (2.1) ignites the fire extinguishing agent column (2), and the fire extinguishing agent column (2) burns to produce gaseous fire extinguishing substances; S2: As the gas production increases, the pressure in the area between the lower side of the piston (5) and the fire extinguishing agent column (2) gradually increases, and eventually the gas thrust overcomes the friction between the piston (5) and the cylinder (1) and the elastic force of the spring (6) to push the piston (5) toward the lower end of the spray pipe (7); S3: When the piston (5) moves to the lower end of the spray pipe (7) and passes through the spray pipe (7) and the rubber sealing plug (9), when the lower end of the spray pipe (7) exceeds the lower side of the piston (5), the spray pipe (7) connects the lower side area of ​​the piston (5) with the nozzle (4), and the fire extinguishing material on the lower side of the piston (5) enters the nozzle (4) along the spray pipe (7) and is then sprayed out from the nozzle (4); S4: After the gaseous fire extinguishing material in the lower area of ​​the piston (5) has been sprayed for a period of time, the gas thrust weakens, and the spring (6) is compressed by the piston (5) to generate a rebound force, thereby pushing the piston (5) to move in the opposite direction, causing the piston (5) to leave the rubber sealing plug (9) and the spraying pipe (7), and the lower area of ​​the piston (5) is separated from the spraying pipe (7), and the fire extinguishing material is blocked by the piston (5) again, and stops being sprayed from the nozzle (4); S5: Repeating steps S2 to S4, the piston (5) periodically moves back and forth, and the lower area of ​​the piston (5) and the nozzle (4) are periodically connected and disconnected, so that the fire extinguishing material is intermittently sprayed from the nozzle (4), realizing a pulse spraying process; S6: The fire extinguishing substance is intermittently sprayed from the nozzle (4) into the battery box; when the gaseous fire extinguishing substance is sprayed into the battery box, the pressure inside the battery box increases; when the fire extinguishing substance stops spraying, the gas inside the battery box is discharged from the gaps in the box body, causing the pressure inside the battery box to decrease; ultimately, the pressure inside the battery box increases and decreases periodically; S7: When the pressure inside the battery box increases, the combustible gas diluted by the fire extinguishing material will be pressed out from the gaps in the battery box. When the pressure inside the battery box decreases, the combustible gas inside the battery escapes and enters the battery box, and the above process is repeated.

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