Intermittent spraying type fire extinguishing device having fan blades and fire extinguishing method

Abstract

An intermittent spraying type fire extinguishing device having fan blades (7) and a fire extinguishing method, wherein the intermittent spraying type fire extinguishing device comprises a housing (1) and a gas-producing fire extinguishing agent (2) provided in the housing (1); a front cover (3) is arranged on the front side of the housing (1); nozzles (4) are formed on the surface of the front cover (3); an end face of the gas-producing fire extinguishing agent (2) is connected to one end of a starting part (5); a rotating shaft (6) rotatably connected to the front cover (3) is arranged in the housing (1); helical blades are arranged on the surface of the rotating shaft (6); the top of the rotating shaft (6) is fixedly connected to the center of a rotating cover (8); spraying holes (9) are formed on the surface of the rotating cover (8); when the rotating cover (8) rotates, the spraying holes (9) coincide and are staggered with the nozzles (4) periodically. An intermittent spraying process can be continuously carried out, so that the pressure of a battery compartment increases and decreases periodically, facilitating complete discharge of combustible gas inside batteries in the battery compartment, avoiding the risk of re-ignition.

Description

Intermittent spraying fire extinguishing device with fan blades and fire extinguishing method Technical Field

[0001] The present invention relates to the technical field of new energy battery fire extinguishing, and in particular to an intermittent spraying fire extinguishing device with fan blades and a fire extinguishing method. Background Art

[0002] When new energy batteries experience thermal runaway, they often continue to produce flammable gases. Traditional aerosol fire extinguishing devices are difficult to extinguish the flames instantly. Pulse fire extinguishing devices can extinguish the flames instantly but cannot achieve the effect of continuous suppression. When the pulse fire extinguishing device is used in combination with the traditional aerosol fire extinguishing device, the pulse fire extinguishing device can extinguish the flames generated instantly when the battery experiences thermal runaway, and the traditional aerosol fire extinguishing device can suppress the flames to a certain extent after the pulse fire extinguishing device is sprayed. Theoretically, the combination of the two overcomes each other's shortcomings, can extinguish the flames instantly and achieve the effect of continuous suppression; however, the following problems still exist. Taking the battery compartment where the battery is located as an example, when the battery experiences thermal runaway, a large amount of flammable gas escapes from the battery and enters the battery box At this time, after the fire extinguishing device is activated, due to the large gas production of the traditional aerosol fire extinguishing device, the aerosol fire extinguishing agent will quickly fill the entire battery box (that is, the battery compartment where the battery is located). 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 excessive positive pressure in the battery compartment when the aerosol fire extinguishing device is sprayed. Therefore, when the aerosol fire extinguishing device is completed, the pressure in the battery compartment drops, and a large amount of flammable gas escapes from the inside of the battery again, and 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 spray continuously and intermittently, so that the pressure of 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 an intermittent spraying fire extinguishing device with fan blades and a fire extinguishing method, which can continuously perform an intermittent spraying process so that the pressure of 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: an intermittent spraying fire extinguishing device with fan blades, comprising a shell and a gas-generating fire extinguishing agent arranged in the shell, a front cover is provided on the front side of the shell, a nozzle is opened on the surface of the front cover, the end face of the gas-generating fire extinguishing agent is connected to one end of the starting component, a rotating shaft rotatably connected to the front cover is provided in the shell, fan blades are provided on the surface of the rotating shaft, the top of the rotating shaft is fixedly connected to the center of the rotating cover, a spray hole is opened on the surface of the rotating cover, and when the rotating cover rotates, the spray hole and the nozzle periodically overlap and intersect.

[0005] Preferably, the top side of the rotating shaft is rotatably connected to the center of the front cover through a bearing.

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

[0007] Preferably, the gas-generating fire extinguishing agent is an aerosol generating agent.

[0008] Preferably, the gas-generating fire extinguishing agent is a columnar structure formed by pressing aerosol generating agent 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 threadedly connected to the top of the shell, and the bottom of the shell is threadedly connected to the outer edge of the rear cover.

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

[0012] Preferably, a coolant is provided in the area between the fan blades and the front cover, and a partition net is provided on the upper and lower surfaces of the coolant, and the partition net is fixedly connected to the inner side of the shell.

[0013] In addition, the present invention also discloses a fire extinguishing method using the intermittent spraying fire extinguishing device with fan blades, which comprises the following steps:

[0014] S1: When thermal runaway of the battery in the battery box occurs, the starting component ignites the gas-generating fire extinguishing agent, which produces gas and fire extinguishing substances;

[0015] S2: The airflow passes through the fan blades. During this process, the fan blades rotate under the thrust of the airflow.

[0016] S3: The rotation of the fan blades causes the rotating shaft to rotate, which in turn drives the rotating cover to rotate, so that the nozzle holes on the surface of the rotating cover and the nozzles on the surface of the front cover periodically overlap and intersect;

[0017] S4: When the nozzle hole and the nozzle outlet coincide, the fire extinguishing substance is sprayed out from the nozzle outlet to extinguish the fire in the battery box. When the nozzle hole and the nozzle outlet intersect, the shell is sealed and the pressure is held back. Finally, the above process is repeated periodically to realize the intermittent spraying process, so that the pressure in the battery box increases and decreases periodically.

[0018] S5: When the pressure inside the battery box increases, the combustible gas diluted by the fire extinguishing material is 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.

[0019] Beneficial effects of the present invention:

[0020] The present invention applies fan blades used in the mechanical field to the field of fire extinguishing devices, so that the fan blades rotate under the thrust of the airflow, thereby driving the rotating cover to rotate, so that the spray holes on the surface of the rotating cover and the nozzles on the surface of the front cover periodically overlap and intersect, so that the fire extinguishing material can be continuously sprayed intermittently, so that the pressure of the battery box increases and decreases periodically, which is beneficial to the complete discharge of combustible gases inside the batteries in the battery box and prevents the risk of re-ignition; in addition, the structure of the fan blades has low starting resistance, and when pushed by the airflow, it is easy to start and rotate, and is not prone to rotation obstruction, and its rotation is sensitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the internal structure of an intermittent spraying fire extinguishing device with fan blades;

[0022] FIG2 is a schematic diagram of the top structure of the front cover in FIG1 ;

[0023] FIG3 is a schematic diagram of the top view of the rotating cover in FIG1 ;

[0024] FIG4 is a schematic diagram of the three-dimensional structure of the fan blade. Implementation Method

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0026] As shown in Figures 1 to 4, an intermittent spraying fire extinguishing device with fan blades includes a shell 1 and a gas-generating fire extinguishing agent 2 arranged in the shell 1. A front cover 3 is provided on the front side of the shell 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 the starting component 5. A rotating shaft 6 rotatably connected to the front cover 3 is provided in the shell 1, and a fan blade 7 is provided on the surface of the rotating shaft 6. The top of the rotating shaft 6 is fixedly connected to the center of a rotating cover 8. A nozzle 9 is opened on the surface of the rotating cover 8. When the rotating cover 8 rotates, the nozzle 9 and the nozzle 4 periodically overlap and intersect.

[0027] Preferably, the top side of the rotating shaft 6 is rotatably connected to the center of the front cover 3 through a bearing. The bearing can effectively limit the rotating shaft 6, making its rotation process stable and reliable, while preventing the rotating shaft 6 from axial movement.

[0028] Preferably, the rotating cover 8 is located on the upper side or the lower side of the front cover 3 .

[0029] Preferably, the gas-generating fire extinguishing agent 2 is an aerosol generating agent.

[0030] Preferably, the gas-generating fire extinguishing agent 2 is a columnar structure formed by pressing aerosol generating agent powder. 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.

[0031] The aerosol generator is a prior art, for example, the invention patent disclosed in Chinese Patent Publication No. CN101745195B is "An aging-resistant aerosol generator and its preparation process", which discloses that the aerosol generator is composed of an oxidant, a reducing agent, and a binder. The oxidant is potassium nitrate, the binder is phenolic resin, and the reducing agent is melamine. The mass percentages thereof are: potassium nitrate 74% to 80%, phenolic resin 8% to 15%, and the balance is melamine.

[0032] Its preparation method is:

[0033] Step 1: dissolving phenolic resin in ethanol to prepare a phenolic resin solution with a mass concentration of 40% to 55%;

[0034] Step 2: Grind the oxidizing agent and reducing agent to a fineness of 80-200 standard mesh, mix them according to the required proportion, and sieve them through 80-200 mesh three times to make them evenly mixed;

[0035] Step 3: Then add the phenolic resin solution to the mixed powder, stir for 10 minutes, and then use a 40-mesh screen to force granulate. Then dry the agent in an environment with a temperature of 40°C and a relative humidity of less than 20% until the volatile components are less than 1%;

[0036] Step 4: The dried medicine is pressed under a pressure of 10 MPa to form an aerosol generating agent column structure.

[0037] 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, overheating, or the like occurs, the fire detection device detects the high temperature environment generated in the battery box due to the fire and sends a signal to the microprocessor, which controls the starting component 5 to ignite the gas-generating fire 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 fire extinguishing agent 2, without the need for additional fire detection devices and other external equipment, which is simpler and less costly.

[0038] Preferably, the outer edge of the front cover 3 is threadedly connected to the top of the housing 1, and the bottom of the housing 1 is threadedly connected to the outer edge of the rear cover 10. Through this threaded connection method, the convenience of installation of the entire fire extinguishing device can be improved and the production process is convenient.

[0039] Preferably, the gas-generating fire extinguishing agent 2 is located in the area where the back 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 back cover 10. The silicone layer 11 can effectively isolate the heat generated by the combustion of the gas-generating fire extinguishing agent 2, preventing the surface temperature of the back cover 10 and the housing 1 from being too high.

[0040] Preferably, a coolant 12 is provided in the area between the fan blades 7 and the front cover 3. Screens 13 are provided on both the upper and lower surfaces of the coolant 12 and are fixedly connected to the inner side of the housing 1. Since the combustion of the gas-generating fire extinguishing agent 2 (e.g., an aerosol generating agent) generates high-temperature substances, the coolant 12 can cool the passing high-temperature fire extinguishing substances, preventing excessive temperatures at the nozzle 4. The screen 13 also serves to limit the coolant 12. In this embodiment, a through-hole for the rotating shaft 6 is provided at the center of the screen, which does not affect the rotation of the rotating shaft 6.

[0041] Preferably, a diaphragm is also attached to the nozzle 4 on the surface of the front cover 3, which can prevent moisture in the outside air from entering through the nozzle 4 during storage and transportation, causing the fire extinguishing agent to absorb moisture. At the same time, it is easy to rupture when under pressure, so it does not affect the spraying process of the fire extinguishing device.

[0042] The fan blade 7 of the present invention is a fan blade or propeller blade structure as shown in Figure 4. The fan blade 7 has a small starting resistance and is easy to start and rotate when pushed by airflow. It is not easy to be blocked in rotation and its rotation is sensitive.

[0043] During the actual production 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 in the shell 1 increases suddenly, if the spray hole 9 and the nozzle 4 are in an intertwined state at this time, the airflow there will directly enter the outside through the nozzle 4 and the gap to relieve the pressure.

[0044] In addition, the present invention also discloses a fire extinguishing method using the intermittent spraying fire extinguishing device with fan blades, which comprises the following steps:

[0045] S1: When a battery in the battery box experiences thermal runaway, the starting component 5 ignites the gas-generating fire extinguishing agent 2, which generates gas and fire extinguishing substances;

[0046] S2: The airflow passes through the position of the fan blade 7. During this process, the fan blade 7 rotates due to the thrust of the airflow.

[0047] S3: The rotation of the fan blades 7 causes the rotating shaft 6 to rotate, thereby driving the rotating cover 8 to rotate, so that the spray holes 9 on the surface of the rotating cover 8 and the nozzles 4 on the surface of the front cover 3 periodically overlap and intersect;

[0048] S4: When the spray hole 9 and the nozzle 4 coincide with each other, the fire extinguishing material is sprayed out from the nozzle 4 to extinguish the fire in the battery box. When the spray hole 9 and the nozzle 4 intersect, the shell 1 is sealed and the pressure is held. Finally, the above process is repeated periodically to realize the intermittent spraying process, so that the pressure in the battery box increases and decreases periodically. In this step, when the fire extinguishing material is sprayed out from the nozzle to extinguish the fire in the battery box, the gas inside the battery box increases, causing the pressure to increase. When the shell is sealed and the pressure is held, the internal pressure of the battery box is released from the gap of the battery box itself, and the pressure decreases. Therefore, the pressure in the battery box increases and decreases periodically.

[0049] S5: When the pressure inside the battery box increases, the flammable gas diluted with the fire extinguishing agent is forced out through 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, repeating the above process. Through this reciprocating cycle of low and high pressure, the flammable gas generated in the battery is finally diluted with the fire extinguishing agent and continuously discharged from the battery box, completing the entire fire extinguishing process and effectively preventing the risk of re-ignition.

[0050] 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. An intermittent spraying fire extinguishing device with fan blades, comprising a housing (1) and a gas-generating fire extinguishing agent (2) arranged in the housing (1), a front cover (3) being arranged on the front side of the housing (1), a nozzle (4) being arranged on the surface of the front cover (3), an end face of the gas-generating fire extinguishing agent (2) being connected to one end of a starting component (5), characterized in that: A rotating shaft (6) rotatably connected to the front cover (3) is provided in the housing (1); a fan blade (7) is provided on the surface of the rotating shaft (6); the top of the rotating shaft (6) is fixedly connected to the center of a rotating cover (8); a spray hole (9) is provided 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.

2. An intermittent spraying fire extinguishing device with fan blades according to claim 1, characterized in that: The top side of the rotating shaft (6) is rotatably connected to the center of the front cover (3) via a bearing.

3. The intermittent spraying fire extinguishing device with fan blades according to claim 1, characterized in that: The rotating cover (8) is located on the upper side or the lower side of the front cover (3).

4. The intermittent spraying fire extinguishing device with fan blades according to claim 1, characterized in that: The gas-generating fire extinguishing agent (2) is an aerosol generating agent.

5. The intermittent spraying fire extinguishing device with fan blades according to claim 2, characterized in that: The gas-generating fire extinguishing agent (2) is a columnar structure formed by pressing aerosol generating agent powder.

6. The intermittent spraying fire extinguishing device with fan blades according to claim 1, characterized in that: The starting component (5) is an electric ignition head or a thermal wire structure.

7. The intermittent spraying fire extinguishing device with fan blades according to claim 1, characterized in that: The outer edge of the front cover (3) is threadedly connected to the top of the shell (1), and the bottom of the shell (1) is threadedly connected to the outer edge of the rear cover (10).

8. An intermittent spraying fire extinguishing device with fan blades 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 silica gel 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 spraying fire extinguishing device with fan blades according to claim 1, characterized in that: A coolant (12) is provided in the area between the fan blades (7) and the front cover (3), and a partition net (13) is provided on the upper and lower surfaces of the coolant (12), and the partition net (13) is fixedly connected to the inner side of the shell (1).

10. A fire extinguishing method using the intermittent spraying fire extinguishing device with fan blades according to any one of claims 1 to 9, characterized in that: It includes the following steps: S1: When a battery in the battery box experiences thermal runaway, the starting component (5) ignites the gas-generating fire extinguishing agent (2), and the gas-generating fire extinguishing agent (2) generates gas and fire extinguishing substances; S2: the airflow passes through the position where the fan blade (7) is located. During this process, the fan blade (7) rotates due to the thrust of the airflow; S3: During the rotation of the fan blades (7), the rotating shaft (6) is rotated, thereby driving the rotating cover (8) to rotate, so that the spray holes (9) on the surface of the rotating cover (8) and the spray ports (4) on the surface of the front cover (3) are periodically overlapped and staggered; S4: When the spray hole (9) and the nozzle (4) overlap, the fire extinguishing substance is sprayed out from the nozzle (4) to extinguish the fire in the battery box. When the spray hole (9) and the nozzle (4) intersect, the shell (1) is sealed and the pressure is held. Finally, the above process is repeated periodically to realize an intermittent spraying process, so that the pressure in the battery box increases and decreases periodically. S5: When the pressure in the battery box increases, the combustible gas diluted by the fire extinguishing material is pressed out from the gaps in the battery box. When the pressure in the battery box decreases, the combustible gas inside the battery escapes and enters the battery box, and the above process is repeated in a cycle.

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