Fire extinguishing device for automobile battery box

Abstract

The invention relates to the technical field of fire extinguishing equipment, in particular to an automobile battery box fire extinguishing device which comprises fire-resistant cover cloth, an operating rod, an air pipe and an air storage tank, a circle of balance weight strip is fixed to the edge of the top face of the fire-resistant cover cloth at intervals, and a circle of limiting belt is further arranged on the edge of the fire-resistant cover cloth and wraps the balance weight strip. A tightening rope connected end to end is further arranged in the limiting belt, at least one crevasse is formed in the side face of the limiting belt, and the tightening rope can be pulled out of the crevasse. A gas extinguishing agent is stored in the gas storage tank, the gas storage tank is connected with the operating rod through a gas pipe, and a spraying hole is formed in the tail end of the operating rod. The device can quickly extinguish the automobile fire hazard caused by the thermal runaway of the lithium battery.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing equipment, and particularly to a fire extinguishing device for an automotive battery box. Background Art

[0002] Currently, the ownership of new energy vehicles and electric bicycles in China is very large and shows an increasing trend year by year. At the same time, fires caused by thermal runaway of lithium batteries occur frequently. The substances burned by lithium batteries are mainly electrolytes and combustible materials inside the battery. During thermal runaway, the electrolyte will boil, spray out, and react with oxygen in the air, generating flames and smoke. At the same time, the positive and negative electrode materials, separators, etc. inside the battery may also burn or decompose at high temperatures, releasing harmful gases. For the existing methods using water, foam, and dry powder as fire extinguishing agents, the fire extinguishing agent cannot enter the lithium battery compartment, making it difficult to quickly extinguish vehicle fires caused by thermal runaway of lithium batteries.

[0003] In the prior art, the invention patent with the application publication number CN104707276A provides an oxygen-free fire extinguishing method, which seals the fire source with a sealed bag, a fire extinguishing box, a fire-resistant sealing plate, and a fire-resistant sealing tarpaulin ( Figure 4 ) to make it lack oxygen and go out. The fire-resistant sealing tarpaulin is provided with a sealing connection device (2) around its perimeter, which can seal and connect multiple sealing tarpaulins to cover a large area of the fire source, making it lack oxygen and go out due to sealing. When a motor vehicle catches fire, a sealed bag (1) made of fire-resistant sealing material is used to quickly cover the burning vehicle into the sealed bag (1). A drawstring (2) capable of tightening and sealing the bag mouth is installed at the sealed bag mouth, and the bag mouth is sealed. The burning vehicle will soon go out on its own in an oxygen-free environment. The invention patent with the application publication number CN106823203A provides a fire extinguishing felt, which includes a fire extinguishing cloth and a drawstring. The drawstring is sewn on the edge of the fire extinguishing cloth. The fire extinguishing cloth is a multi-layer structure, and each layer is woven from alkali-removed fiberglass material impregnated with a liquid fire extinguishing material. It also includes a sealed bag or a sealed tank. When not in use, the fire extinguishing cloth is folded and placed in the sealed bag or the sealed tank. Due to the above structure, it can adsorb thick smoke and toxic gases while extinguishing the fire, and has a good effect on isolating the temperature of the fire source.

[0004] In the process of implementing the present invention, the inventor found that there are at least the following problems in the prior art: 1. Oxygen can exacerbate battery combustion, but it is not a necessary condition for battery combustion. The inside of a lithium battery contains electrolyte and other combustible materials. These materials can undergo violent chemical reactions when the battery is in thermal runaway or short circuit, releasing combustible gases and heat. Even in the absence of oxygen, the chemical reactions inside the battery may continue and generate heat and flames. The oxygen-free fire extinguishing method in the patented technology cannot extinguish the battery fire. Instead, it may cause an explosion due to sealing, resulting in a larger-scale fire. In addition, it is difficult to operate by putting the burning vehicle into a sealed bag, and the implementation cost is high. 2. The fire extinguishing principle of a fire blanket is also to isolate oxygen, and it also cannot extinguish the battery fire. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention develops a fire extinguishing device for an automotive battery box, which can quickly extinguish vehicle fires caused by thermal runaway of lithium batteries.

[0006] The technical solution adopted by the present invention to solve the technical problems is as follows: An embodiment of the present invention provides a fire extinguishing device for an automotive battery box, including a fire-resistant cover cloth. A circle of counterweight strips is fixedly spaced at the top edge of the fire-resistant cover cloth. A limit belt is also provided at the edge of the fire-resistant cover cloth. The limit belt wraps the counterweight strips. The cross-sectional perimeter of the cavity between the limit belt and the fire-resistant cover cloth is less than twice the cross-sectional perimeter of the counterweight strips. A tightening rope that is joined end to end is also provided in the limit belt. At least one break is provided on the side of the limit belt, and the tightening rope can be pulled out from the break. At least two traction rods are evenly provided at the edge of the fire-resistant cover cloth. One end of the traction rod is connected to the fire-resistant cover cloth; the fire extinguishing device for the automotive battery box further includes an operating rod, an air pipe, and a gas storage tank. A gas fire extinguishing agent is stored in the gas storage tank. The gas storage tank is connected to the operating rod through the air pipe, and a spray hole is provided at the end of the operating rod. One end of the traction rod is connected to the fire-resistant cover cloth by adhesion or sewing. The operating rod is a hollow round tube. A valve is provided at the air outlet of the gas storage tank. The valve is a manual valve. One end of the air pipe is connected to the air outlet of the gas storage tank, and the other end is connected to the upper end of the operating rod.

[0007] As an optimization, the end of the operating rod is set to be T-shaped. Both ends of the T-shaped tube are sealed, and a plurality of spray holes are provided on the T-shaped tube.

[0008] As an optimization, the counterweight strip is a long strip-shaped cloth bag filled with iron sand.

[0009] As an optimization, the fire extinguishing device for the automotive battery box further includes an exhaust pipe and an exhaust fan. One end of the exhaust pipe penetrates through the center of the fire-resistant cover cloth, and the other end is connected to the air inlet of the exhaust fan. The exhaust pipe is sealed with the fire-resistant cover cloth.

[0010] As an optimization, the surface of the refractory cover cloth is coated with a silica gel layer, and the refractory cover cloth is a rectangle with a length of 10 to 12 m and a width of 8 to 10 m.

[0011] As an optimization, the gaseous fire extinguishing agent stored in the gas storage tank is any one of heptafluoropropane, 2-bromo-3,3,3-trifluoropropene, and perfluorohexanone.

[0012] As an optimization, the gaseous fire extinguishing agent stored in the gas storage tank is carbon dioxide plus perfluorohexanone.

[0013] As an optimization, a plurality of socket sleeves are arranged around the center of the refractory cover cloth. The socket sleeves penetrate through the refractory cover cloth. A magnet and a pressing plate are further arranged at the end of the operating rod. The magnet is embedded at the end of the operating rod, and the top surface of the magnet is flush with the surface of the operating rod. The pressing plate is a circular iron plate with a circular hole in the center. The diameter of the central hole of the pressing plate is the same as the diameter of the operating rod. The socket sleeve includes a flared opening, a connecting plate, an upper valve sleeve, a lower valve sleeve, a valve core, a gear, a rack, a spring, a sealing plate, and a torsion spring. The flared opening is a circular tube with a flared opening at one end. The connecting plate is fixed on the outside of the flared opening. The connecting plate is connected to and sealed with the refractory cover cloth. The upper valve sleeve and the lower valve sleeve form a spherical cavity that is vertically and horizontally through. The valve core is arranged in the spherical cavity. The main body of the valve core is spherical. Through holes with a diameter larger than the diameter of the operating rod are arranged at the upper and lower ends of the valve core. Rotating shafts corresponding to the upper valve sleeve and the lower valve sleeve are arranged on the left and right sides of the valve core. Sealing plates are arranged at the two openings on the left and right of the spherical cavity. The two ends of the torsion spring are respectively connected to the sealing plate and the rotating shaft. One rotating shaft passes through the sealing plate and is connected to the gear. The rack is arranged vertically. The rack meshes with the gear. A square rod is arranged at the upper end of the rack. A square guiding hole corresponding to the square rod is arranged on the connecting plate. A baffle is arranged at the top of the square rod. The square rod passes through the guiding hole on the connecting plate. The spring is arranged on the square rod between the baffle and the connecting plate.

[0014] As an optimization, the magnet is composed of multiple long strip-shaped magnet rods. The magnet rods are distributed circumferentially along the central axis of the operating rod. The magnet rods are parallel to the central axis of the operating rod. The injection holes are arranged in the gaps between the magnet rods.

[0015] As an optimization, the magnet is an open ring, and the injection holes are arranged at the opening of the magnet.

[0016] The effects provided in the invention content are only the effects of the embodiments, rather than all the effects of the present invention. The above technical solutions have the following advantages or beneficial effects:

[0017] 1. When it is necessary to extinguish the fire in the vehicle battery box, two people each hold a traction rod and control the position of the fire-resistant cover cloth directly above the vehicle, and then lower the fire-resistant cover cloth; pull out the tightening rope from the break in the limit belt and tighten it until all adjacent counterweight strips are fitted together; then hold the operating rod and place the end of the operating rod below the vehicle battery box with the injection holes facing upwards, and open the valve of the gas storage tank to spray the chemical gas fire extinguishing agent. By setting the cross-sectional perimeter of the cavity between the limit belt and the fire-resistant cover cloth to be less than twice the cross-sectional perimeter of the counterweight strip, when tightening the tightening rope, it can ensure that all adjacent counterweight strips are fitted together but will not cross and overlap each other in the cavity between the limit belt and the fire-resistant cover cloth. By setting the fire-resistant cover cloth and arranging the counterweight strip, limit belt, and tightening rope at the edge of the fire-resistant cover cloth, the fire-resistant cover cloth can be made to fit the ground, and the burning electric vehicle can be enclosed in the narrow space between the fire-resistant cover cloth and the ground, reducing the entry of external air and reducing the fire. By setting the gas storage tank and spraying the chemical gas fire extinguishing agent below the battery box through the operating rod, the chemical gas fire extinguishing agent can enter the battery compartment along with the convective gas generated by the combustion, quickly blocking the combustion reaction chain and forcing the flame in the battery compartment to go out. The space formed between the fire-resistant cover cloth and the ground can also slow down the dissipation of the chemical gas fire extinguishing agent, maintain the concentration of the chemical gas fire extinguishing agent in the space, and accelerate the fire extinguishing speed. After the fire is extinguished, it is necessary to wait for the battery to cool down to avoid reignition. During the waiting process, the spraying speed of the gas fire extinguishing agent can be reduced, and it is only necessary to keep the space filled with the gas fire extinguishing agent. This device can quickly extinguish vehicle fires caused by battery thermal runaway.

[0018] 2. By setting the end of the operating rod to be T-shaped, more injection holes can be set, improving the spraying speed of the chemical gas fire extinguishing agent. During fire extinguishing, the lower part of the T-shaped pipe contacts the ground and the injection holes face upwards, which can make the reaction force generated by the spraying of the gas fire extinguishing agent downward, preventing the operating rod from swinging or reversing, and facilitating the rapid dispersion of the sprayed gas fire extinguishing agent to fill the space between the fire-resistant cover cloth and the ground.

[0019] 3. By setting the counterweight strip as a long strip-shaped cloth bag wrapped with iron sand, the counterweight strip has a certain flexibility and can be deformed to a certain extent. When tightening the limit belt, the fitting degree between adjacent counterweight strips can be improved, the fitting degree between the counterweight strip and the ground can be improved, the sealing performance of the space between the fire-resistant cover cloth and the ground can be enhanced, and the fire extinguishing speed can be increased.

[0020] 4. When opening the valve of the gas storage tank, start the exhaust fan at the same time, and close the exhaust fan when chemical gas fire extinguishing agent appears in the extracted air. By setting the exhaust pipe and the exhaust fan, the air in the space between the fire-resistant cover cloth and the ground can be quickly discharged, improving the fire extinguishing speed. The exhaust port of the exhaust fan can also be connected to a gas collection device or an exhaust gas treatment device.

[0021] 5. The surface of the fire-resistant cover cloth is coated with a silica gel layer, which can improve the sealing performance and prevent air from flowing through the gaps in the cloth. Since cars are usually long and strip-shaped, setting the fire-resistant cover cloth as a rectangle can improve the utilization rate of the fire-resistant cover cloth.

[0022] 6. Set the gaseous fire extinguishing agent stored in the gas storage tank to be carbon dioxide plus perfluoromethylcyclohexanone. Perfluoromethylcyclohexanone has less volume requirement for the gas storage tank, which is more convenient for storage on ships and in underground garages and for quick movement during fire extinguishing.

[0023] 7. When the socket sleeve is not provided, the operating rod can only be inserted from one side of the fire-resistant cover cloth, resulting in a gap between the operating rod and the fire-resistant cover cloth and inconvenient movement of the operating rod. By setting the socket sleeve, the sealing of the fire-resistant cover cloth can be ensured when the operating rod is not inserted; during fire extinguishing, it can not only ensure that the operating rod quickly passes through the fire-resistant cover cloth but also ensure the sealing between the operating rod and the fire-resistant cover cloth. By arranging multiple socket sleeves around the center on the fire-resistant cover cloth, the staff can flexibly select the socket sleeve closest to the battery box to insert the operating rod for fire extinguishing according to the location of the burning car. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a perspective view of the working state of the first embodiment of the present invention.

[0025] Figure 2 It is Figure 1 a partial enlarged view of area D in

[0026] Figure 3 It is a top view of the operating rod in the first embodiment of the present invention.

[0027] Figure 4 It is a perspective view of the working state of the second embodiment of the present invention.

[0028] Figure 5 It is Figure 4 a partial enlarged view of area C in

[0029] Figure 6 It is a perspective view of the socket sleeve in the second embodiment of the present invention.

[0030] Figure 7 It is a perspective view of the plugged state of the operating rod and the socket sleeve in the second embodiment of the present invention.

[0031] Figure 8 It is a front view of the plugged state of the operating rod and the socket sleeve in the second embodiment of the present invention.

[0032] Figure 9 It is Figure 8 a sectional view taken along the direction of A-A.

[0033] Figure 10 It is Figure 8 a perspective view after sectional view taken along the direction of A-A.

[0034] Figure 11 This is a partial view of the end part of the operating rod in the third embodiment of the present invention.

[0035] Figure 12 This is the overall structure diagram of the fourth embodiment of the present invention.

[0036] Wherein: refractory cover cloth 1, counterweight bar 2, limit band 3, tightening rope 4, towing bar 5, socket sleeve 6, pressing plate 7, exhaust pipe 8, exhaust fan 9, operating rod 10, air pipe 11, air storage tank 12, vehicle 13, magnet 101, injection hole 102, bell mouth 61, connecting plate 62, upper valve sleeve 63, lower valve sleeve 64, valve core 65, gear 66, rack 67, spring 68, sealing plate 69, torsion spring 610, rotating shaft 651, square rod 671, baffle 672. Detailed implementation manners

[0037] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation manners and in conjunction with its accompanying drawings.

[0038] Figures 1 to 3 This is the first embodiment of the present invention, as shown in Figure 1 、 Figure 2As shown in the figure, an automobile battery box fire extinguishing device includes a fire-resistant cover cloth 1, an exhaust pipe 8, a suction fan 9, an operating rod 10, an air pipe 11, and a gas storage tank 12. A circle of counterweight strips 2 is fixedly spaced at the top edge of the fire-resistant cover cloth 1. A limit belt 3 is also provided at the edge of the fire-resistant cover cloth 1. The limit belt 3 wraps the counterweight strips 2. The cross-sectional perimeter of the cavity between the limit belt 3 and the fire-resistant cover cloth 1 is less than twice the cross-sectional perimeter of the counterweight strip 2. A tightening rope 4 that is connected end to end is also provided in the limit belt 3. At least one break is provided on the side of the limit belt 3, and the tightening rope 4 can be pulled out from the break. A traction rod 5 is respectively provided at the four corners of the edge of the fire-resistant cover cloth 1. One end of the traction rod 5 is connected to the fire-resistant cover cloth 1; a gas fire extinguishing agent is stored in the gas storage tank 12. The gas storage tank 12 is connected to the operating rod 10 through the air pipe 11, and a spray hole 102 is provided at the end of the operating rod 10. One end of the traction rod 5 is connected to the fire-resistant cover cloth 1 by adhesion or sewing. The operating rod 10 is a hollow round tube. A valve is provided at the air outlet of the gas storage tank 12. The valve is a manual valve. One end of the air pipe 11 is connected to the air outlet of the gas storage tank 12, and the other end is connected to the upper end of the operating rod 10. One end of the exhaust pipe 8 penetrates through the center of the fire-resistant cover cloth 1, and the other end is connected to the air inlet of the suction fan 9. The exhaust pipe 8 is sealed with the fire-resistant cover cloth 1. When the valve of the gas storage tank 12 is opened, the suction fan 9 is started at the same time. When chemical gas fire extinguishing agent appears in the extracted air, the suction fan 9 is turned off. By providing the exhaust pipe 8 and the suction fan 9, the air between the fire-resistant cover cloth 1 and the ground can be quickly discharged, improving the fire extinguishing speed. The exhaust port of the suction fan 9 can also be connected to a gas collection device or an exhaust gas treatment device. The main harmful components in the extracted air are carbon monoxide CO, carbon dioxide CO2, nitrogen oxides NOx, and hydrogen fluoride HF. The corresponding exhaust gas treatment device can be a low-nitrogen combustion device plus an activated carbon air filter.

[0039] As Figure 3 shown, the end of the operating rod 10 is set to be T-shaped. The two ends of the T-shaped tube are sealed, and a plurality of spray holes 102 are provided on the T-shaped tube. By setting the end of the operating rod 10 to be T-shaped, more spray holes 102 can be provided, improving the spraying speed of the chemical gas fire extinguishing agent. During fire extinguishing, the lower part of the T-shaped tube contacts the ground and the spray holes 102 face upward, so that the reaction force generated by the spraying of the gas fire extinguishing agent is downward, preventing the operating rod 10 from swinging or reversing, and facilitating the rapid dispersion of the ejected gas fire extinguishing agent to fill the space between the fire-resistant cover cloth 1 and the ground.

[0040] The counterweight strip 2 is a long strip-shaped cloth bag wrapped with iron sand. By setting the counterweight strip 2 as a long strip-shaped cloth bag wrapped with iron sand, the counterweight strip 2 has a certain flexibility and can be deformed to a certain extent. When the limit belt 3 is tightened, the fitting degree between adjacent counterweight strips 2 can be improved, the fitting degree between the counterweight strip 2 and the ground can be improved, the sealing performance of the space between the fire-resistant cover cloth 1 and the ground can be enhanced, and the fire extinguishing speed can be improved.

[0041] The surface of the refractory cover cloth 1 is coated with a silica gel layer, and the refractory cover cloth 1 is a rectangle with a length of 10 - 12 m and a width of 8 - 10 m. Coating the surface of the refractory cover cloth 1 with a silica gel layer can improve the sealing performance and prevent air from flowing through the gaps in the cloth. Since cars are usually long and strip-shaped, setting the refractory cover cloth 1 as a rectangle can improve the utilization rate of the refractory cover cloth 1.

[0042] The gaseous fire extinguishing agent stored in the gas storage tank 12 is any one of heptafluoropropane, 2-bromo-3,3,3-trifluoropropene, and perfluoromethyl isopropyl ketone. Preferably, the gaseous fire extinguishing agent stored in the gas storage tank 12 is a mixture of carbon dioxide and perfluoromethyl isopropyl ketone. Perfluoromethyl isopropyl ketone and carbon dioxide have similarities in molecular structure and are mutually soluble. A large amount of compressed carbon dioxide gas dissolves in the perfluoromethyl isopropyl ketone liquid. When the saturated solution of the two is ejected from the multiple rows of small holes of the nozzle, due to the rapid decrease in pressure, a large amount of carbon dioxide gas escapes from the solution, spraying the perfluoromethyl isopropyl ketone into an ultra-fine mist jet with a large scattering area. In the hot environment of an electric vehicle fire, the low-boiling perfluoromethyl isopropyl ketone droplets quickly vaporize into a gas jet and disperse into all spaces inside the vehicle. Since the density of perfluoromethyl isopropyl ketone gas is less than that of heptafluoropropane gas, and the extinguishing concentration of perfluoromethyl isopropyl ketone gas is lower than that of heptafluoropropane, when extinguishing fires of the same scale, the mass consumption of the perfluoromethyl isopropyl ketone fire extinguishing agent is 40% of that of the heptafluoropropane fire extinguishing agent. Perfluoromethyl isopropyl ketone has less volume requirement for the gas storage tank 12, making it more convenient for storage and rapid movement during fire extinguishing on ships and in underground garages.

[0043] When it is necessary to extinguish the fire in the vehicle battery box, two people respectively hold a traction rod 5 and control the position of the refractory cover cloth 1 above the vehicle, and then lower the refractory cover cloth 1; pull out and tighten the tightening rope 4 from the break in the limit belt 3 until all adjacent counterweight strips 2 are fitted together; then hold the operating rod 10 and place the end of the operating rod 10 under the vehicle battery box with the spraying hole 102 facing upwards, and open the valve of the gas storage tank 12, then the chemical gaseous fire extinguishing agent can be sprayed out.

[0044] By setting the cross-sectional perimeter of the cavity between the limit belt 3 and the refractory cover cloth 1 to be less than twice the cross-sectional perimeter of the counterweight strip 2, when tightening the tightening rope 4, it can be ensured that all adjacent counterweight strips 2 are fitted together without overlapping and crossing each other in the cavity between the limit belt 3 and the refractory cover cloth 1.

[0045] By setting the fire-resistant cover cloth 1 and arranging the counterweight strip 2, the limit belt 3, and the tightening rope 4 at the edge of the fire-resistant cover cloth 1, the fire-resistant cover cloth 1 can be made to fit the ground, and the burning electric vehicle can be enclosed in the narrow space between the fire-resistant cover cloth 1 and the ground, reducing the entry of external air and minimizing the fire. During the research and development of this patent, it was found that when simply using the heat-resistant cover cloth to extinguish a car fire, the heat-resistant cover cloth could not completely block the entry of external air into the enclosed space, and the battery could also burn in an oxygen-free state, so the fire could not be quickly extinguished, and the small internal fire continued to burn. The continuous high temperature inside the vehicle would completely damage the internal facilities. Therefore, in the event of a fire in the vehicle battery box, the vehicle is enclosed in the narrow space formed by the heat-resistant cover cloth and the ground. While blocking the inflow of external air, a high-concentration chemical gas fire extinguishing agent is injected into the enclosed space. The chemical gas fire extinguishing agent has excellent dispersion performance. By setting the gas storage tank 12 and spraying the chemical gas fire extinguishing agent under the battery box through the operating rod 10, the chemical gas fire extinguishing agent can enter the battery compartment along with the convective gas generated by combustion. When the concentration of the chemical gas fire extinguishing agent reaches a certain value, usually 7-10%, the combustion reaction chain can be quickly blocked, forcing the flame in the battery compartment to go out. The space formed between the fire-resistant cover cloth 1 and the ground can also slow down the dissipation of the chemical gas fire extinguishing agent, maintain the concentration of the chemical gas fire extinguishing agent in the space, and accelerate the fire extinguishing speed. After the fire is extinguished, it is necessary to wait for the battery to cool down to avoid re-ignition. During the waiting process, the spraying speed of the gas fire extinguishing agent can be reduced, and it is only necessary to keep the space filled with the gas fire extinguishing agent. This device can quickly extinguish the car fire caused by battery thermal runaway.

[0046] Figures 4 to 10This is the second embodiment of the present invention, which is different from the first embodiment in that: a plurality of socket sleeves 6 are arranged around the center on the refractory cover cloth 1, the socket sleeves 6 penetrate through the refractory cover cloth 1, and a magnet 101 and a pressing plate 7 are further arranged at the end of the operating rod 10. The magnet 101 is embedded at the end of the operating rod 10, and the top surface of the magnet 101 is flush with the surface of the operating rod 10. The pressing plate 7 is a circular iron plate with a circular hole in the center, and the diameter of the central hole of the pressing plate 7 is the same as the diameter of the operating rod 10; the socket sleeve 6 includes a flared mouth 61, a connecting plate 62, an upper valve sleeve 63, a lower valve sleeve 64, a valve core 65, a gear 66, a rack 67, a spring 68, a sealing plate 69, and a torsion spring 610. The flared mouth 61 is a circular tube with a flared opening at one end. The connecting plate 62 is fixed on the outside of the flared mouth 61, and the connecting plate 62 is connected to and sealed with the refractory cover cloth 1. The upper valve sleeve 63 and the lower valve sleeve 64 form a spherical cavity that is vertically and horizontally through. The valve core 65 is arranged in the spherical cavity. The main body of the valve core 65 is spherical. Through holes with a diameter larger than the diameter of the operating rod 10 are arranged at the upper and lower ends of the valve core 65. Rotating shafts 651 corresponding to the upper valve sleeve 63 and the lower valve sleeve 64 are arranged on the left and right sides of the valve core 65. Sealing plates 69 are arranged at the left and right openings of the spherical cavity. The two ends of the torsion spring 610 are respectively connected to the sealing plate 69 and the rotating shaft 651. One rotating shaft 651 passes through the sealing plate 69 and then connects to the gear 66. The rack 67 is arranged vertically, the rack 67 meshes with the gear 66, a square rod 671 is arranged at the upper end of the rack 67, a square guiding hole corresponding to the square rod 671 is arranged on the connecting plate 62, a baffle 672 is arranged at the top of the square rod 671, the square rod 671 passes through the guiding hole on the connecting plate 62, and the spring 68 is arranged on the square rod 671 between the baffle 672 and the connecting plate 62. The magnet 101 is an open ring, and the injection hole 102 is arranged at the opening of the magnet 101.

[0047] In the free state, under the action of the torsion spring 610, the through holes at the upper and lower ends of the valve core 65 are in a horizontal state. The upper and lower ends of the upper valve sleeve 63 and the lower valve sleeve 64 are closed, and gas cannot pass through. When the operating rod 10 is inserted from the bell mouth 61, first, the pressing plate 7 contacts the baffle 672. As the insertion depth of the operating rod 10 increases, the pressing plate 7 drives the rack 67 to move downward, and the rack 67 drives the gear 66 to rotate, thereby driving the valve core 65 to rotate. When the pressing plate 7 fits with the bell mouth 61, the through holes at the upper and lower ends of the valve core 65 are in a vertical state, and the upper and lower ends of the upper valve sleeve 63 and the lower valve sleeve 64 are penetrated. At this time, there is still a certain distance between the lower end of the operating rod 10 and the upper end of the valve core 65. The operating rod 10 continues to be inserted until it inserts into and penetrates the upper and lower through holes of the valve core 65 and enters the area below the automotive battery box under the fireproof cover cloth 1. During this process, the pressing plate 7 is restricted by the bell mouth 61 and cannot move, the rack 67 stops moving, and the pressing plate 7 makes a sliding contact with the magnet 101 until it disengages. When the operating rod 10 is withdrawn from the socket sleeve 6, the pressing plate 7 will be re-adsorbed at the end of the operating rod 10. Under the action of the torsion spring 610, the through holes at the upper and lower ends of the valve core 65 return to the horizontal state, realizing the sealing of the socket sleeve 6. When the socket sleeve 6 is not provided, the operating rod 10 can only be inserted from one side of the fireproof cover cloth 1, there will be a gap between the operating rod 10 and the fireproof cover cloth 1, and the movement of the operating rod 10 is inconvenient. By providing the socket sleeve 6, the sealing of the fireproof cover cloth 1 can be ensured when the operating rod 10 is not inserted. During fire extinguishing, it can not only ensure that the operating rod 10 quickly passes through the fireproof cover cloth 1, but also ensure the sealing between the operating rod 10 and the fireproof cover cloth 1. By arranging a plurality of socket sleeves 6 around the center on the fireproof cover cloth 1, the staff can flexibly select the socket sleeve 6 closest to the battery box according to the position of the burning vehicle and insert the operating rod 10 for fire extinguishing.

[0048] Figure 11 This is the third embodiment of the present invention, and the difference from the second embodiment is that: the magnet 101 is composed of a plurality of long strip-shaped magnet rods, the magnet rods are circumferentially distributed along the central axis of the operating rod 10, the magnet rods are parallel to the central axis of the operating rod 10, and the injection holes 102 are arranged in the gaps between the magnet rods.

[0049] Figure 12 This is the fourth embodiment of the present invention, and the difference from the previous three embodiments is that: the automotive battery box fire extinguishing device further includes a vehicle carrier 13, the vehicle carrier 13 is a transport vehicle with a cargo bed, and the fireproof cover cloth 1, the operating rod 10, the air pipe 11, and the air storage tank 12 are all placed in the cargo bed of the vehicle carrier 13.

[0050] Although the specific embodiments of the invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. An automotive battery box fire extinguishing device, comprising a fire-resistant cover cloth (1), characterized in that: A weight bar (2) is fixedly arranged at intervals along the top edge of the refractory cover cloth (1). A limiting belt (3) is also arranged at the edge of the refractory cover cloth (1). The limiting belt (3) wraps the weight bar (2). The cross-sectional perimeter of the cavity between the limiting belt (3) and the refractory cover cloth (1) is less than twice the cross-sectional perimeter of the weight bar (2). A tightening rope (4) connected end to end is arranged in the limiting belt (3). At least one break is arranged on the side surface of the limiting belt (3). The tightening rope (4) can be pulled out from the break. At least two traction rods (5) are evenly arranged at the edge of the refractory cover cloth (1). One end of the traction rod (5) is connected to the refractory cover cloth (1). The vehicle battery box fire extinguishing device further comprises an operating rod (10), an air pipe (11), and an air storage tank (12). The air storage tank (12) stores a gaseous fire extinguishing agent. The air storage tank (12) is connected to the operating rod (10) through the air pipe (11). A spray hole (102) is arranged at the end of the operating rod (10).

2. The fire extinguishing device for an automotive battery box according to claim 1, wherein, The end of the operating rod (10) is arranged in a T shape. Both ends of the T-shaped pipe are sealed. A plurality of spray holes (102) are arranged on the T-shaped pipe.

3. The fire extinguishing device for an automotive battery box according to claim 1, characterized in that, The weight bar (2) is a long strip-shaped cloth bag filled with iron sand.

4. The fire extinguishing device for an automotive battery box according to claim 1, characterized in that, The vehicle battery box fire extinguishing device further comprises an exhaust pipe (8) and an exhaust fan (9). One end of the exhaust pipe (8) penetrates through the center of the refractory cover cloth (1), and the other end is connected to the air inlet of the exhaust fan (9). A seal is provided between the exhaust pipe (8) and the refractory cover cloth (1).

5. The fire extinguishing device for an automotive battery box according to claim 1, wherein The surface of the refractory cover cloth (1) is coated with a silica gel layer. The refractory cover cloth (1) is a rectangle with a length of 10 - 12 m and a width of 8 - 10 m.

6. The fire extinguishing device for an automotive battery box according to claim 1, characterized in that, The gaseous fire extinguishing agent stored in the air storage tank (12) is any one of heptafluoropropane, 2-bromo-3,3,3-trifluoropropene, and perfluoromethyl isopropyl ketone.

7. The fire extinguishing device for an automotive battery box according to claim 1, characterized in that, The gaseous fire extinguishing agent stored in the air storage tank (12) is carbon dioxide plus perfluoromethyl isopropyl ketone.

8. The fire extinguishing device for an automotive battery box according to claim 1, characterized in that, A plurality of socket sleeves (6) are arranged around the center on the refractory cover cloth (1). The socket sleeves (6) penetrate through the refractory cover cloth (1). A magnet (101) and a pressing plate (7) are further arranged at the end of the operating rod (10). The magnet (101) is embedded at the end of the operating rod (10), and the top surface of the magnet (101) is flush with the surface of the operating rod (10). The pressing plate (7) is a circular iron plate with a round hole in the center. The diameter of the central hole of the pressing plate (7) is the same as the diameter of the operating rod (10). The socket sleeve (6) includes a bell mouth (61), a connecting plate (62), an upper valve sleeve (63), a lower valve sleeve (64), a valve core (65), a gear (66), a rack (67), a spring (68), a sealing plate (69), and a torsion spring (610). The bell mouth (61) is a round tube with a trumpet-shaped opening at one end. The connecting plate (62) is fixed on the outer side of the bell mouth (61), and the connecting plate (62) is connected to and sealed with the refractory cover cloth (1). The upper valve sleeve (63) and the lower valve sleeve (64) form a spherical cavity that is vertically and horizontally through. The valve core (65) is arranged in the spherical cavity. The main body of the valve core (65) is spherical. Through holes with a diameter larger than the diameter of the operating rod (10) are arranged at the upper and lower ends of the valve core (65). Rotating shafts (651) corresponding to the upper valve sleeve (63) and the lower valve sleeve (64) are arranged on the left and right sides of the valve core (65). Sealing plates (69) are arranged at the left and right openings of the spherical cavity. The two ends of the torsion spring (610) are respectively connected to the sealing plate (69) and the rotating shaft (651). A rotating shaft (651) passes through the sealing plate (69) and then connects to the gear (66). The rack (67) is arranged vertically, and the rack (67) meshes with the gear (66). A square rod (671) is arranged at the upper end of the rack (67). A square guide hole corresponding to the square rod (671) is arranged on the connecting plate (62). A baffle (672) is arranged at the top of the square rod (671). The square rod (671) passes through the guide hole on the connecting plate (62). The spring (68) is arranged on the square rod (671) between the baffle (672) and the connecting plate (62).

9. The fire extinguishing device for an automotive battery box according to claim 8, wherein, The magnet (101) is composed of a plurality of long strip-shaped magnet rods. The magnet rods are circumferentially distributed along the central axis of the operating rod (10), and the magnet rods are parallel to the central axis of the operating rod (10). The injection holes (102) are arranged in the gaps between the magnet rods.

10. The fire extinguishing device for an automotive battery box according to claim 8, characterized in that, The magnet (101) is an open ring, and the injection holes (102) are arranged at the opening of the magnet (101).

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