Intermittent spraying type fire extinguishing device and method for aerosol-boosted liquid fire extinguishing agent

Abstract

The intermittent spraying type fire extinguishing device comprises a shell and a gas production fire extinguishing agent arranged in the shell, a front cover is arranged on the front side of the shell, a spraying opening is formed in the surface of the front cover, the end face of the gas production fire extinguishing agent is connected with one end of a starting component, and a piston in sliding fit with the shell is arranged in the shell; the piston is connected with the bottom of the front cover through a screw rod of a ball screw mechanism, the top of the screw rod is fixedly connected with the center of the rotating cover, a liquid fire extinguishing agent is arranged between the piston and the front cover, spraying holes are formed in the surface of the rotating cover, and when the rotating cover rotates, the spraying holes and the spraying holes are periodically overlapped and staggered; the intermittent spraying process can be continuously carried out, so that the pressure of the battery box is periodically increased and reduced, combustible gas in a battery in the battery box can be completely discharged, and the risk of re-combustion is prevented.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing technology for new energy batteries, specifically to an intermittent spray fire extinguishing device and method for aerosol-assisted liquid fire extinguishing agent. Background Technology

[0002] When new energy batteries experience thermal runaway, they often continuously produce flammable gases. Traditional aerosol fire extinguishing devices are unable to extinguish the flames instantly, while pulse fire extinguishing devices can extinguish the flames instantly but cannot achieve a sustained suppression effect. Combining pulse fire extinguishing devices with traditional aerosol fire extinguishing devices allows the pulse fire extinguishing device to extinguish the flames generated instantly during battery thermal runaway, while the traditional aerosol fire extinguishing device provides some suppression after the pulse fire extinguishing device has finished spraying. Theoretically, this combination overcomes each other's shortcomings, achieving both instantaneous flame extinguishing and sustained suppression. However, the following problem still exists: taking the battery compartment as an example, when the battery experiences thermal runaway, a large amount of flammable gas escapes from the battery and enters the battery box. When the fire extinguishing device is activated, due to the large gas production of traditional aerosol fire extinguishing devices, the aerosol extinguishing agent quickly fills the entire battery box (i.e., the battery compartment where the battery is located). During this process, only a portion of the combustible gas is expelled from the battery compartment. More combustible gas is often trapped inside the battery due to the excessive positive pressure inside the battery compartment when the aerosol fire extinguishing device is discharged, preventing complete discharge. Therefore, after the aerosol fire extinguishing device finishes discharging, the pressure inside the battery compartment drops, and a large amount of combustible gas escapes from the battery again, still posing a risk of reignition. Therefore, it is necessary to improve the traditional aerosol fire extinguishing device and design a fire extinguishing device that can continuously and intermittently discharge, 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 this invention is to overcome the above-mentioned shortcomings and provide an intermittent discharge fire extinguishing device and method for aerosol-assisted liquid fire extinguishing agent, which can continuously carry out the intermittent discharge process, so that the pressure of the battery box increases and decreases periodically, which is conducive to the complete discharge of flammable gas inside the battery in the battery box and prevents the risk of reignition.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent, comprising a shell and a gas-generating fire extinguishing agent disposed within the shell, a front cover provided on the front side of the shell, a nozzle being provided on the surface of the front cover, the end face of the gas-generating fire extinguishing agent being connected to one end of an actuating component, a piston being disposed within the shell and slidingly engaged therewith, the piston being connected to the bottom of the front cover via a ball screw mechanism, the top of the screw being fixedly connected to the center of a rotating cover, a liquid fire extinguishing agent being disposed between the piston and the front cover, and a spray hole being provided on the surface of the rotating cover, wherein the spray hole and the nozzle periodically overlap and intersect when the rotating cover rotates.

[0005] Preferably, the ball screw mechanism includes a nut fixed inside the piston, the spiral groove area in which the nut contacts the screw is filled with balls, and the top side of the screw is rotatably connected to the center of the front cover via a bearing.

[0006] Preferably, the rotating cover is located on the upper or lower side of the front cover.

[0007] Preferably, the gas-generating extinguishing agent is an aerosol generator, and the liquid extinguishing agent is perfluorohexanone extinguishing agent.

[0008] Preferably, the gas-generating fire extinguishing agent is a cylindrical structure formed by pressing aerosol generator powder.

[0009] Preferably, the starting component is an electric ignition head or a thermal wire structure.

[0010] Preferably, the outer edge of the front cover is threaded to the top of the housing, and the bottom of the housing is threaded to the outer edge of the rear cover.

[0011] Preferably, the gas-generating fire extinguishing agent is located in the area where the rear cover is located, and a silicone layer is provided between the outer surface of the gas-generating fire extinguishing agent and the inner surface of the rear cover.

[0012] Preferably, a guide rail is also provided vertically on the inner side of the housing, and a guide groove is provided on the outer side of the piston, with the guide groove slidingly engaging with the guide rail.

[0013] In addition, the present invention also discloses a fire extinguishing method for the above-mentioned aerosol-propelled intermittent discharge fire extinguishing device for liquid fire extinguishing agent, which includes the following steps: S1: When thermal runaway occurs in the battery box, the starting component ignites the gas-generating fire extinguishing agent, which produces gas. S2: The airflow pushes the piston to move to the position of the front cover, and the screw rotates through the ball screw mechanism. S3: When the screw rotates, it drives the rotating cover to rotate, so that the nozzles on the surface of the rotating cover and the nozzles on the surface of the front cover periodically overlap and intersect. S4: When the nozzle and the spray port coincide, the liquid extinguishing agent is sprayed out from the spray port. Under the action of the high temperature inside the battery box, it is converted into a gaseous state to extinguish the fire inside the battery box. When the nozzle and the spray port are intersected, the shell is sealed and a pressure-holding process is carried out. Finally, the above process is repeated periodically to realize the intermittent discharge process, which makes the pressure inside the battery box increase and decrease periodically. S5: When the pressure inside the battery box increases, the flammable gas diluted by the fire extinguishing agent is forced out from the gaps in the battery box. When the pressure inside the battery box decreases, the flammable gas inside the battery escapes and enters the battery box, and the above process is repeated.

[0014] The beneficial effects of this invention are: In this invention, the airflow pushes the piston to move to the position of the front cover, and the ball screw mechanism causes the screw to rotate. When the screw rotates, it drives the rotating cover to rotate, so that the spray holes on the surface of the rotating cover and the spray nozzles on the surface of the front cover periodically overlap and intersect. This allows the liquid fire extinguishing agent to continuously and intermittently release, causing the pressure in the battery box to increase and decrease periodically. This is beneficial for the complete discharge of flammable gases inside the battery in the battery box and prevents the risk of reignition. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of an intermittent spray fire extinguishing device that uses aerosol-propelled liquid fire extinguishing agent. Figure 2 for Figure 1 Top view of the front cover structure; Figure 3 for Figure 1 A top view of the rotating cover; Figure 4 This is a schematic diagram of the planar structure in which the piston fits into the inner wall of the housing. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1 to 4 As shown, an intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent includes a housing 1 and a gas-generating fire extinguishing agent 2 disposed within the housing 1. A front cover 3 is provided on the front side of the housing 1, and a nozzle 4 is opened on the surface of the front cover 3. The end face of the gas-generating fire extinguishing agent 2 is connected to one end of an actuating component 5. A piston 7 is provided inside the housing 1 and slides therewith. The piston 7 is connected to the bottom of the front cover 3 through a screw 6.1 of a ball screw mechanism 6. The top of the screw 6.1 is fixedly connected to the center of a rotating cover 8. Liquid fire extinguishing agent 12 is disposed between the piston 7 and the front cover 3. A spray hole 9 is opened on the surface of the rotating cover 8. When the rotating cover 8 rotates, the spray hole 9 and the nozzle 4 periodically overlap and intersect.

[0018] Preferably, the ball screw mechanism 6 includes a nut 6.2 fixedly disposed inside the piston 7. The spiral groove area where the nut 6.2 contacts the screw 6.1 is filled with balls. The top side of the screw 6.1 is rotatably connected to the center of the front cover 3 via a bearing. The ball screw mechanism 6 is a commonly used component in the field of manufacturing. It consists of a nut 6.2, a screw 6.1, a ball return tube, balls, a dustproof plate, a reversing device, etc. Since the balls roll along the spiral groove area formed by the screw and nut during operation, the movement resistance is extremely small. Therefore, when the piston 7 is compressed and moves upward, it will drive the nut 6.2 to move upward, and the screw 6.1 will rotate, thereby driving the rotating cover 8 to rotate. In addition, in this invention, the bearing can play a good limiting role for the screw 6.1, making its rotation process stable and reliable, while preventing the screw 6.1 from moving axially.

[0019] Preferably, the rotating cover 8 is located on the upper or lower side of the front cover 3.

[0020] Preferably, the gas-generating extinguishing agent 2 is an aerosol generator, and the liquid extinguishing agent 12 is a perfluorohexanone extinguishing agent. The aerosol generator produces a large amount of gas when burning, which can push the piston 7 to move; the perfluorohexanone extinguishing agent selected for the liquid extinguishing agent 12 has a boiling point of 49°C and is easily vaporized by its high temperature when a fire occurs, thereby changing the gas pressure in the release area.

[0021] Preferably, the gas-generating extinguishing agent 2 is a cylindrical structure formed by pressing aerosol generator powder. This cylindrical aerosol generator burns more slowly than powdered aerosol generators, ensuring a continuous release of the extinguishing substance.

[0022] Preferably, the starting component 5 is an electric ignition head or a thermal wire structure. When the starting component 5 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 or overheating occurs, the fire detection device detects the high-temperature environment generated by the fire in the battery compartment and sends a signal to the microprocessor. The microprocessor then controls the starting component 5 to ignite the gas-generating extinguishing agent 2. When the starting component 5 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 gas-generating extinguishing agent 2, eliminating the need for additional fire detection devices and other external equipment, making it simpler and less costly.

[0023] Preferably, the outer edge of the front cover 3 is threaded to the top of the housing 1, and the bottom of the housing 1 is threaded to the outer edge of the rear cover 10. This threaded connection method improves the ease of installation of the entire fire extinguishing device and facilitates the production process.

[0024] Preferably, the gas-generating fire extinguishing agent 2 is located in the area where the rear cover 10 is located, and a silicone layer 11 is provided between the outer surface of the gas-generating fire extinguishing agent 2 and the inner surface of the rear cover 10. The silicone layer 11 can effectively isolate the heat generated when the gas-generating fire extinguishing agent 2 is burning, and prevent the surface temperature of the rear cover 10 and the shell 1 from becoming too high.

[0025] Preferably, a guide rail 13 is vertically provided on the inner side of the housing 1, and a guide groove 14 is provided on the outer side of the piston 7, with the guide groove 14 slidingly engaging with the guide rail 13. The sliding engagement between the guide groove 14 and the guide rail 13 ensures the stability of the piston 7's movement and also prevents the piston 7 from rotating radially.

[0026] Preferably, a diaphragm is also attached to the nozzle 4 on the surface of the front cover 3. This diaphragm can prevent moisture from the outside air from entering the nozzle 4 during storage and transportation, thus preventing the extinguishing agent from absorbing moisture. At the same time, the diaphragm is easy to break under pressure, so it does not affect the discharge process of the extinguishing device.

[0027] In the actual production process of the fire extinguishing device, a certain gap can be reserved between the rotating cover 8 and the front cover 3. If the rotation of the rotating cover 8 is obstructed or the pressure inside the shell 1 increases suddenly, and if the nozzle 9 and the nozzle 4 are in an interleaved state at this time, the airflow will directly enter the outside through the gap and the nozzle 4 to relieve pressure.

[0028] To ensure that perfluorohexanone liquid extinguishing agent does not leak from gaps in the contact area between piston 7 and screw 6.1 during storage and transportation, a sealing ring can be added to the area where piston 7 contacts screw 6.1, which can effectively prevent the above-mentioned leakage phenomenon.

[0029] In addition, the present invention also discloses a fire extinguishing method for the above-mentioned aerosol-propelled intermittent discharge fire extinguishing device for liquid fire extinguishing agent, which includes the following steps: S1: When thermal runaway occurs in the battery box, the starting component 5 ignites the gas-generating fire extinguishing agent 2, and the gas-generating fire extinguishing agent 2 produces gas. S2: The airflow pushes the piston 7 to move to the position of the front cover 3, and the screw 6.1 rotates due to the action of the ball screw mechanism 6; S3: When the screw 6.1 rotates, it drives the rotating cover 8 to rotate, so that the nozzle 9 on the surface of the rotating cover 8 and the nozzle 4 on the surface of the front cover 3 periodically overlap and intersect. S4: When nozzle 9 coincides with nozzle 4, liquid extinguishing agent 12 is sprayed out from nozzle 4. Under the action of high temperature inside the battery box, it is converted into gaseous state to extinguish the fire inside the battery box. When nozzle 9 and nozzle 4 are staggered, the shell 1 is sealed and undergoes a pressure-holding process. Finally, the above process is repeated periodically to achieve intermittent discharge, causing the pressure inside the battery box to increase and decrease periodically. In this step, when the extinguishing material is sprayed out from the nozzle to extinguish the fire in the battery box, the gas inside the battery box increases, resulting in an increase in pressure. When the shell is sealed and undergoes a pressure-holding process, the pressure inside the battery box is released from the gaps in the battery box itself, and the pressure decreases. Therefore, the pressure inside the battery box increases and decreases periodically.

[0030] S5: When the pressure inside the battery compartment increases, the flammable gas, diluted with the 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 alternating low-pressure and high-pressure cycle, the flammable gas generated inside the battery is ultimately diluted with the extinguishing agent and continuously discharged from the battery compartment, completing the entire fire extinguishing process and effectively preventing the risk of reignition.

[0031] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent, comprising a housing (1) and a gas-generating fire extinguishing agent (2) disposed within the housing (1), a front cover (3) provided on the front side of the housing (1), a nozzle (4) provided on the surface of the front cover (3), and the end face of the gas-generating fire extinguishing agent (2) connected to one end of a starting component (5), characterized in that: The housing (1) is provided with a piston (7) that slides with it. The piston (7) is connected to the bottom of the front cover (3) through the screw (6.1) of the ball screw mechanism (6). The top of the screw (6.1) is fixedly connected to the center of the rotating cover (8). A liquid fire extinguishing agent (12) is provided between the piston (7) and the front cover (3). The rotating cover (8) has a spray hole (9) on its surface. When the rotating cover (8) rotates, the spray hole (9) and the nozzle (4) periodically overlap and intersect.

2. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 1, characterized in that: The ball screw mechanism (6) includes a nut (6.2) fixed inside the piston (7). The spiral groove area where the nut (6.2) contacts the screw (6.1) is filled with balls. The top side of the screw (6.1) is rotatably connected to the center of the front cover (3) through a bearing.

3. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 1, characterized in that: The rotating cover (8) is located on the upper or lower side of the front cover (3).

4. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 1, characterized in that: The gas-generating extinguishing agent (2) is an aerosol generator, and the liquid extinguishing agent (12) is a perfluorohexanone extinguishing agent.

5. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 4, characterized in that: The gas-generating fire extinguishing agent (2) is a columnar structure formed by pressing aerosol generator powder.

6. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 1, characterized in that: The starting component (5) is an electric ignition head or a thermal wire structure.

7. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 1, characterized in that: The outer edge of the front cover (3) is threaded to the top of the housing (1), and the bottom of the housing (1) is threaded to the outer edge of the rear cover (10).

8. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 7, characterized in that: The gas-generating fire extinguishing agent (2) is located in the area where the rear cover (10) is located, and a silicone layer (11) is provided between the outer surface of the gas-generating fire extinguishing agent (2) and the inner surface of the rear cover (10).

9. The intermittent spray fire extinguishing device for aerosol-propelled liquid fire extinguishing agent according to claim 1, characterized in that: The inner side of the housing (1) is also provided with a vertical guide rail (13), and the outer side of the piston (7) is provided with a guide groove (14), which slides in cooperation with the guide rail (13).

10. A method for extinguishing a fire using an intermittent spray fire extinguishing device for aerosol-propelled liquid extinguishing agent as described in any one of claims 1 to 9, characterized in that: It includes the following steps: S1: When thermal runaway occurs in the battery box, the starting component (5) ignites the gas-generating fire extinguishing agent (2), and the gas-generating fire extinguishing agent (2) generates gas; S2: The airflow pushes the piston (7) to move to the position of the front cover (3), and the screw (6.1) rotates through the action of the ball screw mechanism (6); S3: When the screw (6.1) rotates, it drives the rotating cover (8) to rotate, so that the nozzle (9) on the surface of the rotating cover (8) and the nozzle (4) on the surface of the front cover (3) periodically overlap and intersect. S4: When the nozzle (9) coincides with the nozzle (4), the liquid extinguishing agent (12) is sprayed out from the nozzle (4). Under the action of the high temperature inside the battery box, it is converted into a gaseous state to extinguish the fire inside the battery box. When the nozzle (9) and the nozzle (4) are intersected, the shell (1) is sealed and a pressure-holding process is carried out. Finally, the above process is repeated periodically to realize the intermittent discharge process, so that the pressure inside the battery box increases and decreases periodically. S5: When the pressure inside the battery box increases, the flammable gas diluted by the fire extinguishing agent is forced out from the gaps in the battery box. When the pressure inside the battery box decreases, the flammable gas inside the battery escapes and enters the battery box, and the above process is repeated.

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