A pulse-jet aerosol fire extinguishing device and extinguishing method with an exhaust pipe

Abstract

This invention discloses a pulse-jet aerosol fire extinguishing device and method with an exhaust pipe, comprising a cylinder and an extinguishing agent column disposed within the cylinder. A front cover is provided on the front side of the cylinder, and a nozzle is opened on the surface of the front cover. The extinguishing agent column is connected to one end of an actuation component. A piston that slides within the cylinder is provided in the area between the extinguishing agent column and the nozzle. Multiple exhaust pipes are arranged axially on the outer side of the cylinder. The upper end of each exhaust pipe communicates with a higher area inside the cylinder, and the lower end communicates with a lower area inside the cylinder. The thickness of the piston is less than the distance between the upper and lower ends of the exhaust pipes. This invention facilitates the complete discharge of flammable gases inside the battery within the battery box, preventing the risk of reignition.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing technology for new energy batteries, specifically to a pulse-jet aerosol fire extinguishing device and method with an exhaust pipe. Background Technology

[0002] Currently, aerosol fire suppression systems are often kept in the battery compartments of new energy batteries to extinguish fires within the batteries. When a battery experiences thermal runaway, a large amount of flammable gas escapes from the battery and enters the battery box (i.e., the battery compartment where the battery is located). When the aerosol fire suppression system is activated, due to the large gas production of traditional aerosol fire suppression systems, the aerosol extinguishing agent quickly fills the entire battery box. During this process, only a portion of the flammable gas is expelled from the battery box. More flammable gas is often trapped inside the battery box due to the large gas production during aerosol fire suppression system discharge, resulting in excessive positive pressure and preventing complete expulsion. Therefore, after the aerosol fire suppression system finishes discharging, the pressure inside the battery box drops, and a large amount of flammable gas escapes from the battery again, still posing a risk of reignition. Therefore, it is necessary to improve traditional aerosol fire suppression systems and design a fire suppression system capable of continuous pulse discharge, causing the pressure inside the battery box to increase and decrease 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 a pulse-jet aerosol fire extinguishing device and method with an exhaust pipe, which can realize a continuous pulse-jet process, so that the pressure inside the battery box increases and decreases periodically, which is conducive to the complete discharge of flammable gas inside the battery and prevents the risk of reignition.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a pulse-jet aerosol fire extinguishing device with an exhaust pipe, comprising a cylinder and an extinguishing agent column disposed within the cylinder, a front cover provided on the front side of the cylinder, a nozzle being provided on the surface of the front cover, the extinguishing agent column being connected to one end of an actuation component, a piston being provided in the area between the extinguishing agent column and the nozzle, which slides in cooperation with the cylinder, and multiple sets of exhaust pipes being provided axially on the outer side of the cylinder, the upper end of the exhaust pipe communicating with the higher area inside the cylinder, and the lower end communicating with the lower area inside the cylinder, the thickness of the piston being less than the distance between the upper and lower ends of the exhaust pipe.

[0005] Preferably, the front cover is threaded to the top of the cylinder, and the bottom of the cylinder is threaded to the rear cover.

[0006] Preferably, the extinguishing agent column is a column structure formed by pressing aerosol generator powder.

[0007] Preferably, the starting component is an electric ignition head or a thermal wire structure, and the end face of the extinguishing agent column is connected to one end of the starting component.

[0008] Preferably, the outer surface of the extinguishing agent column is provided with a silicone layer.

[0009] Preferably, the exhaust pipe has a U-shaped pipe structure.

[0010] Preferably, the axial spacing between the multiple sets of exhaust pipes is the same.

[0011] Preferably, each group of exhaust pipes consists of multiple pipes, which are arranged in a ring array on the outside of the cylinder.

[0012] In addition, this invention discloses a fire extinguishing method for the above-mentioned pulse-jet aerosol fire extinguishing device, which includes the following steps:

[0013] S1: When the battery in the battery box experiences thermal runaway, the starting component ignites the extinguishing agent column, which burns to produce gaseous extinguishing substances.

[0014] S2: As the gas production increases, the pressure in the area between the lower side of the piston and the extinguishing agent column gradually increases. Eventually, the gas thrust overcomes the friction between the piston and the cylinder and pushes the piston toward the location of the exhaust pipe.

[0015] S3: When the piston moves to the cylinder area corresponding to the upper and lower ends of the exhaust pipe, the exhaust pipe connects the upper and lower areas of the piston. The extinguishing material on the lower side of the piston enters the upper side of the piston through the exhaust pipe and is then sprayed out from the nozzle.

[0016] S4: When the piston moves to other areas of the cylinder, the upper or lower end of the exhaust pipe is blocked by the side of the piston, and the extinguishing material cannot pass through the exhaust pipe and stops being sprayed from the nozzle;

[0017] S5: Repeat steps S3 and S4 to intermittently release the extinguishing material from the nozzle, thus achieving a pulse release process;

[0018] S6: The extinguishing agent is intermittently sprayed from the nozzle into the battery box; when the gaseous extinguishing agent is sprayed into the battery box, the internal pressure of the battery box increases; when the extinguishing agent stops spraying, the gas inside the battery box will be released from the gaps in its body, causing the internal pressure of the battery box to decrease; ultimately, the pressure inside the battery box increases and decreases periodically.

[0019] S7: When the pressure inside the battery box increases, the flammable gas diluted by the fire extinguishing agent will be 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.

[0020] The beneficial effects of this invention are:

[0021] This invention, through the cooperation of the piston and the exhaust pipe, enables the fire extinguishing material to be intermittently sprayed from the nozzle, achieving a continuous pulse spray process. This causes the pressure inside the battery box to increase and decrease periodically, which is beneficial for the complete discharge of flammable gases inside the battery and prevents the risk of reignition. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of a pulse-jet aerosol fire extinguishing device with an exhaust pipe. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, a pulse-jet aerosol fire extinguishing device with an exhaust pipe includes a cylinder 1 and a fire extinguishing agent column 2 disposed inside 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 an actuation component 2.1. A piston 5 that slides and engages with the cylinder 1 is provided in the area between the fire extinguishing agent column 2 and the nozzle 4. Multiple sets of exhaust pipes 6 are provided axially on the outer side of the cylinder 1. The upper end of the exhaust pipe 6 communicates with the higher area inside the cylinder 1, and the lower end communicates with the lower area inside the cylinder 1. The thickness of the piston 5 is less than the distance between the upper and lower ends of the exhaust pipe 6. In this embodiment, when the thickness of piston 5 is less than the distance between the upper and lower ends of exhaust pipe 6, the exhaust pipe 6 can connect the upper and lower areas of piston 5 when piston 5 moves to the area of ​​cylinder 1 corresponding to the upper and lower ends of exhaust pipe 6. The extinguishing material on the lower side of piston 5 enters the upper side of piston 5 along exhaust pipe 6 and is then sprayed out from nozzle 4. When piston 5 moves to other positions, one end of exhaust pipe 6 will be blocked by the side of piston 5. At this time, the upper and lower sides of piston 5 are independent spatial areas, and the lower side of piston 5 can start the pressure accumulation or pressure holding process, as can be seen in the following method steps.

[0025] Preferably, the front cover 3 is threaded to the top of the cylinder 1, and the bottom of the cylinder 1 is threaded to the rear cover 7.

[0026] Preferably, the extinguishing agent column 2 is a cylindrical structure formed by pressing aerosol generator powder. When the aerosol generator burns, it produces a large amount of gas, which pushes the piston 5 upwards. Furthermore, this cylindrical aerosol generator burns more slowly than powdered aerosol generators, ensuring the continuous release of the extinguishing agent.

[0027] Preferably, the ignition component 2.1 is an electric ignition head or a thermal wire structure, with the end face of the extinguishing agent column 2 connected to one end of the ignition component 2.1. When the ignition 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 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 ignition component 2.1 to ignite the extinguishing agent column 2. When the ignition 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 extinguishing agent column 2, eliminating the need for additional fire detection devices and other external equipment, making it simpler and less costly.

[0028] Preferably, the outer surface of the extinguishing agent column 2 is provided with a silicone layer 8. The silicone layer 8 can effectively isolate the heat generated during the combustion of the extinguishing agent column 2, preventing the surface temperature of the cylinder 1 from becoming too high.

[0029] Preferably, the exhaust pipe 6 has a U-shaped pipe structure. As shown in the figure, this U-shaped pipe structure of the exhaust pipe 6 is symmetrical and easy to install. It only requires drilling corresponding holes on the surface of the cylinder 1 and then installing the exhaust pipe 6.

[0030] Preferably, the axial spacing between the multiple sets of exhaust pipes 6 is the same. This design ensures the stability of the pulse emission frequency.

[0031] Preferably, there are multiple exhaust pipes 6 in each group, and they are arranged in a ring array on the outside of the cylinder 1. With this design, when the piston 5 moves to the area of ​​the cylinder 1 corresponding to the upper and lower ends of the exhaust pipe 6, the exhaust pipe 6 connects the upper and lower areas of the piston 5. The extinguishing material on the lower side of the piston 5 can enter the upper side of the piston 5 evenly and quickly through the multiple exhaust pipes 6, and then be sprayed out from the nozzle 4.

[0032] In addition, this invention discloses a fire extinguishing method for the above-mentioned pulse-jet aerosol fire extinguishing device, which includes the following steps:

[0033] S1: When the battery in the battery box experiences thermal runaway, the starting component 2.1 ignites the extinguishing agent column 2, which burns to produce gaseous extinguishing substances;

[0034] S2: As the gas production increases, the pressure in the area between the lower side of piston 5 and the extinguishing agent column 2 gradually increases. Eventually, the gas thrust overcomes the friction between piston 5 and cylinder 1 and pushes piston 5 toward the location of exhaust pipe 6.

[0035] S3: When piston 5 moves to the area of ​​cylinder 1 corresponding to the upper and lower ends of exhaust pipe 6, exhaust pipe 6 connects the upper and lower areas of piston 5, and the extinguishing material on the lower side of piston 5 enters the upper side of piston 5 along exhaust pipe 6 and then sprays out from nozzle 4.

[0036] S4: When piston 5 moves to other areas of cylinder 1, the upper or lower end of exhaust pipe 6 is blocked by the side of piston 5, and the extinguishing material cannot pass through exhaust pipe 6 and stops being sprayed from the nozzle.

[0037] S5: Repeat steps S3 and S4 to intermittently release the extinguishing material from nozzle 4, thus achieving a pulse release process;

[0038] S6: The extinguishing agent is intermittently sprayed from nozzle 4 into the battery box; when the gaseous extinguishing agent is sprayed into the battery box, the internal pressure of the battery box increases; when the extinguishing agent stops spraying, the gas inside the battery box will be released from the gaps in its body, causing the internal pressure of the battery box to decrease; ultimately, the pressure inside the battery box increases and decreases periodically; in this step, when the extinguishing agent is sprayed from nozzle 4 to extinguish the fire in the battery box, the increase in gas inside the battery box leads to an increase in pressure; and when the extinguishing agent stops spraying, the gas inside the battery box will be released from the gaps in its body, causing the internal pressure of the battery box to decrease, so the pressure inside the battery box increases and decreases periodically.

[0039] S7: 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, most of the flammable gas generated inside the battery can be 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.

[0040] 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. A pulse-jet aerosol fire extinguishing device with an exhaust pipe, comprising a cylinder (1) and a fire extinguishing agent column (2) disposed within the cylinder (1), a front cover (3) provided on the front side of the cylinder (1), a nozzle (4) being provided on the surface of the front cover (3), and the fire extinguishing agent column (2) being connected to one end of an activation component (2.1), characterized in that: The area between the extinguishing agent column (2) and the nozzle (4) is provided with a piston (5) that slides with the cylinder (1). Multiple sets of exhaust pipes (6) are provided on the outer side of the cylinder (1) along the axial direction. The upper end of the exhaust pipe (6) is connected to the higher area inside the cylinder (1), and the lower end is connected to the lower area inside the cylinder (1). The thickness of the piston (5) is less than the distance between the upper and lower ends of the exhaust pipe (6). The extinguishing agent column (2) is a column structure made of aerosol generating agent powder. The starting component (2.1) is an electric ignition head or a thermal wire structure. The end face of the extinguishing agent column (2) is connected to one end of the starting component (2.1).

2. The pulse-jet aerosol fire extinguishing device with an exhaust pipe according to claim 1, characterized in that: The front cover (3) is threaded to the top of the cylinder (1), and the bottom of the cylinder (1) is threaded to the rear cover (7).

3. A pulse-jet aerosol fire extinguishing device with an exhaust pipe according to claim 1, characterized in that: The outer surface of the extinguishing agent column (2) is provided with a silicone layer (8).

4. A pulse-jet aerosol fire extinguishing device with an exhaust pipe according to claim 1, characterized in that: The exhaust pipe (6) has a U-shaped pipe structure.

5. A pulse-jet aerosol fire extinguishing device with an exhaust pipe according to claim 1, characterized in that: The axial spacing between the multiple sets of exhaust pipes (6) is the same.

6. A pulse-jet aerosol fire extinguishing device with an exhaust pipe according to claim 1, characterized in that: Each set of exhaust pipes (6) consists of multiple pipes, which are arranged in a ring array on the outside of the cylinder (1).

7. A method for extinguishing a fire using the pulse-jet aerosol fire extinguishing device according to any one of claims 1 to 6, 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 extinguishing agent column (2), and the extinguishing agent column (2) burns to produce gaseous extinguishing substances; S2: As the gas production increases, the pressure in the area between the lower side of the piston (5) and the extinguishing agent column (2) gradually increases. Eventually, the gas thrust overcomes the friction between the piston (5) and the cylinder (1) and pushes the piston (5) toward the location of the exhaust pipe (6). S3: When the piston (5) moves to the area of ​​the cylinder (1) between the upper and lower ends of the exhaust pipe (6), the exhaust pipe (6) connects the upper and lower areas of the piston (5), and the extinguishing material on the lower side of the piston (5) enters the upper side of the piston (5) along the exhaust pipe (6) and then sprays out from the nozzle (4). S4: When the piston (5) moves to other areas of the cylinder (1), the upper or lower end of the exhaust pipe (6) is blocked by the side of the piston (5), and the extinguishing material cannot pass through the exhaust pipe (6) and stops being sprayed from the nozzle; S5: Repeat steps S3 and S4 to intermittently release the extinguishing material from the nozzle (4) to achieve the pulse release process; S6: The extinguishing agent is intermittently sprayed from the nozzle (4) into the battery box; when the gaseous extinguishing agent is sprayed into the battery box, the internal pressure of the battery box increases; when the extinguishing agent stops spraying, the gas inside the battery box will be released from the gaps in its box, causing the internal pressure of the battery box to decrease; ultimately causing the pressure inside the battery box to increase and decrease periodically. S7: When the pressure inside the battery box increases, the flammable gas diluted by the fire extinguishing agent will be 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.

Images