A handheld low-pressure dual-fluid water mist lithium battery fire extinguisher

Abstract

The present invention discloses a handheld low-pressure dual-fluid fine water mist lithium battery fire extinguisher, comprising a steel cylinder, a fire extinguishing pipe, a fire extinguishing nozzle and a spraying device, wherein a vertically arranged partition is provided in the steel cylinder, and the partition divides the internal space of the steel cylinder into a large chamber and a small chamber, wherein the large chamber is connected to the spraying device, wherein the large chamber is filled with high-pressure nitrogen, and the small chamber is filled with a combination of tap water and high-pressure nitrogen, and a siphon is inserted in the small chamber, wherein one end of the siphon is connected to the spraying device, and the other end is inserted into the tap water. The handheld low-pressure dual-fluid fine water mist lithium battery fire extinguisher of the present invention uses tap water and nitrogen as working media, has low cost and good economy.

Description

Technical Field

[0001] The invention relates to a fire extinguisher, and more particularly to a handheld low-pressure double-fluid fine water mist lithium battery fire extinguisher. Background Art

[0002] In recent years, power banks have frequently caught fire on airplanes. The essence of this phenomenon is that the lithium battery in the power bank has thermal runaway in an adverse environment. Lithium batteries are very likely to short-circuit under conditions such as squeezing, overheating, and overcharging. Once a short circuit occurs, a large amount of heat will be generated inside the battery instantly, which may trigger thermal runaway of the lithium battery or even explode. Relevant studies have shown that when a 18650 lithium battery has thermal runaway, it will generate a high temperature of about 600 ° C, about 1000 ppm of CO, and a large amount of black dust, including toxic organic substances such as naphthalene, benzene, pentadiene, and styrene. In the enclosed space of a civil aircraft cabin, if a large amount of toxic substances are released instantly, it will seriously threaten the safety of passengers' lives. In addition, in the flight environment of a passenger aircraft, the high altitude, relatively dry air, low air pressure, and certain turbulence will all become the cause of the power bank fire. However, due to the suddenness of thermal runaway of lithium batteries, high temperatures can be generated instantly, and lithium battery fires are deep internal fires, which cannot be effectively suppressed by general fire extinguishing agents. At present, the fire extinguishing agents used on civil airliners are still halon 1301 and halon 1211. Since the use of halon fire extinguishing agents will damage the ozone layer, in 1987, the United Nations passed the Montreal Protocol on Substances that Deplete the Ozone Layer, requiring all countries to stop producing halon fire extinguishing agents after 2010. Halon fire extinguishing agents cannot completely suppress lithium battery fires.

[0003] According to the "Lithium Battery Emergency Handling Guidelines" issued by the Transport Department of the Civil Aviation Administration of China, when a lithium battery catches fire in the cabin, the handling principles for relevant personnel are: use a water fire extinguisher or other non-flammable liquid to cool the battery core and device, cool the battery core in the battery that caught fire, and prevent the heat from spreading to the adjacent battery core. If there is no water fire extinguisher, other non-flammable liquids can be used to cool the battery core and device (such as carbonated drinks, cola, coffee, juice, etc.). If there is an open flame, use a halon fire extinguisher to control the spread of the lithium battery fire to the surrounding fire. After using a halon or water fire extinguisher to extinguish the fire, the lithium battery should be fully covered and soaked with water or non-flammable liquid containing water immediately, because only water or non-flammable liquid containing water can sufficiently cool the battery core in the lithium battery or lithium battery pack and prevent it from re-igniting. It is forbidden to move the lithium battery before the open fire is extinguished. Confirm that the lithium battery after the fire is extinguished no longer emits smoke and other phenomena. After the state is stable, use auxiliary tools such as trash cans filled with water, ice buckets, etc. to move it to an area with less risk. At the same time, during the fire-fighting process, every passenger must wear a protective respiratory protection device (PBE) to reduce the harm of harmful gases to the human body.

[0004] At present, with the existing lithium battery fire disposal technology on aircraft, there is a lack of special fire extinguishers in the cabin for lithium battery fires. At the same time, the harmful gases produced by lithium battery fires cannot be effectively treated, so that toxic gases are discharged into the cabin, which may pose a secondary threat to the health of passengers. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a low-pressure dual-fluid fine water mist lithium battery fire extinguisher, which can effectively suppress lithium battery fires and purify harmful smoke, and can be used to extinguish lithium battery fires in aircraft cabins.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a handheld low-pressure dual-fluid fine water mist lithium battery fire extinguisher, comprising a steel cylinder, a fire extinguishing pipe, a fire extinguishing nozzle and a spraying device, wherein the spraying device is installed on the bottle mouth of the steel cylinder, one end of the fire extinguishing pipe is connected to the spraying device, and the other end is connected to the fire extinguishing nozzle, a vertically arranged partition is provided in the steel cylinder, the partition divides the internal space of the steel cylinder into a large chamber and a small chamber, the large chamber is connected to the spraying device, wherein the large chamber is filled with high-pressure nitrogen, the small chamber is filled with a combination of tap water and high-pressure nitrogen, a siphon is inserted in the small chamber, one end of the siphon is connected to the spraying device, and the other end is inserted into the tap water.

[0007] As a further improvement of the present invention, the spraying device includes a pressure gauge, an output valve and a pressing handle. The output valve is fixedly installed at the bottle mouth of the steel cylinder to be connected to the large chamber and the siphon tube and communicate with each other. The pressure gauge is fixed between the output valve and the steel cylinder to detect the pressure in the steel cylinder. The output valve is linked to the pressing handle and is controlled by the pressing handle to press nitrogen and tap water into the fire extinguishing pipe respectively.

[0008] As a further improvement of the present invention, the fire extinguishing nozzle includes a mixing chamber, a nitrogen interface, a tap water interface and a nozzle, the nitrogen interface and the tap water interface are both fixed on the upper end surface of the mixing chamber and communicated with the interior of the mixing chamber, the nozzle is fixed on the lower end surface of the mixing chamber and communicated with the interior of the mixing chamber, and the nitrogen interface and the tap water interface are respectively connected to the nitrogen channel and the tap water channel in the fire extinguishing pipe and communicated with each other.

[0009] As a further improvement of the present invention, the fire extinguishing nozzle is provided with an isolation cover for covering the burning lithium battery.

[0010] As a further improvement of the present invention, the isolation cover includes a hollow cover body, the upper end of the cover body is sleeved on the fire extinguishing nozzle, and a purification channel is opened in the side wall of the cover body. The purification channel extends spirally from top to bottom in the side wall of the cover body, and the upper end extends to the inner wall of the cover body to communicate with the internal space of the cover body, and the lower end extends to the outer wall of the cover body to communicate with the outside world. Activated carbon particles are attached to the channel wall of the purification channel.

[0011] As a further improvement of the present invention, an electric vacuum pump is provided on the side wall of the fire extinguishing pipe near the ejection device, the air inlet of the electric vacuum pump is connected to the isolation cover through the fire extinguishing pipe, and the air outlet of the electric vacuum pump is connected to the outside after being equipped with a filter.

[0012] Beneficial effects of the present invention:

[0013] 1. This portable low-pressure dual-fluid water mist fire extinguisher can effectively extinguish lithium battery fires. It is light in weight, uses less water, and is economical.

[0014] 2. High air pressure is stored internally, and the output pressure is controlled by a pressure regulating valve to achieve stable working pressure. The atomization effect of fine water mist will not decrease with the decrease of pressure.

[0015] 3. The working medium is tap water and nitrogen, without any additives, green and environmentally friendly, and the inert gas has good spatial dispersion and dispersibility, making the droplets evenly distributed.

[0016] 4. This fire extinguishing agent is designed with a toxic smoke collection and purification filter device, which can reduce the harm to the human body caused by toxic smoke generated by thermal runaway of lithium batteries.

[0017] 5. The water mist nozzle is close to the fire source, and the water mist can directly act on the fire area to improve the fire extinguishing efficiency. The high kinetic energy nitrogen directly acts on the surface of the lithium battery to accelerate its cooling. At the same time, in a confined space, the inert gas can inhibit the chemical reaction inside the lithium battery, which has the dual effects of physical cooling and chemical inhibition. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a fire extinguisher of the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the medium cylinder;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the fire extinguishing sprinkler;

[0021] Figure 4 for Figure 1 Schematic diagram of the structure of the middle isolation cover. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments given in the accompanying drawings.

[0023] Reference Figures 1 to 4 As shown, a handheld low-pressure dual-fluid fine water mist lithium battery fire extinguisher of this embodiment includes a steel cylinder 1, a fire extinguishing pipe 2, a fire extinguishing nozzle 3 and a spraying device 4, wherein the spraying device 4 is installed on the bottle mouth of the steel cylinder 1, one end of the fire extinguishing pipe 2 is connected to the spraying device 4, and the other end is connected to the fire extinguishing nozzle 3, and a vertical partition 11 is provided in the steel cylinder 1, and the partition 11 divides the internal space of the steel cylinder 1 into a large chamber 12 and a small chamber 13, and the large chamber 12 is connected to the spraying device 4. The discharge device 4 is connected, wherein the large chamber 12 is filled with high-pressure nitrogen, and the small chamber 13 is filled with a combination of tap water and high-pressure nitrogen. A siphon 14 is inserted into the small chamber 13, and one end of the siphon 14 is connected to the discharge device 4, and the other end is inserted into the tap water. In the fire extinguisher of this embodiment, the high-pressure nitrogen filled in the large chamber 12 is used to maintain the output pressure at 1.2Mpa by a pressure regulating valve, and the small chamber 13 is filled with nitrogen and tap water, and the water consumption is about 0.5 L, the nitrogen filling pressure is 2 Mpa, and the driving gas is used to press the tap water out of the bottle through the siphon 14. In this way, when using the fire extinguisher of this embodiment, you only need to operate the spray device 4 by hand. Through the release effect of the spray device 4, the high-pressure nitrogen and tap water are pressed into the fire extinguishing pipe 2, and then they can be mixed in the fire extinguishing pipe 2 or mixed in the fire extinguishing nozzle 3 and then sprayed from the fire extinguishing nozzle 3, so as to achieve the effect of extinguishing the lithium battery through the fine water mist mixed with nitrogen and tap water.

[0024] As an improved specific implementation method, the spraying device 4 includes a pressure gauge 41, an output valve 42 and a pressing handle 43. The output valve 42 is fixedly installed at the bottle mouth of the steel cylinder 1 to be connected to the large chamber 12 and the siphon tube 14 and communicate with each other. The pressure gauge 41 is fixed between the output valve 42 and the steel cylinder 1 to detect the pressure in the steel cylinder 1. The output valve 42 is linked with the pressing handle 43 and is controlled by the pressing handle 43 to press nitrogen and tap water into the fire extinguishing pipe 2 respectively. In this way, through the arrangement of the pressure gauge 41, the output valve 42 and the pressing handle 43, the effect of controlling whether nitrogen and tap water are output from the steel cylinder 1 can be effectively achieved by pressing the handle 43. The pressing handle 43 in this embodiment is also provided with a safety pin.

[0025] As an improved specific implementation method, the fire extinguishing nozzle 3 includes a mixing chamber 31, a nitrogen interface 32, a tap water interface 33 and a nozzle 34. The nitrogen interface 32 and the tap water interface 33 are both fixed on the upper end surface of the mixing chamber 31 and communicated with the interior of the mixing chamber 31. The nozzle 34 is fixed on the lower end surface of the mixing chamber 31 and communicated with the interior of the mixing chamber 31. The nitrogen interface 32 and the tap water interface 33 are respectively connected to the nitrogen channel and the tap water channel in the fire extinguishing pipe 2 and communicated with each other. Since the mixing of nitrogen and tap water requires a certain contact time, and the fire extinguishing pipe 2 is generally a hose structure, if the nitrogen and tap water are mixed in the fire extinguishing pipe 2, it is likely to cause the fire extinguishing pipe 2 to deform, which will cause problems that the operator cannot control. In this way, through the setting of the mixing chamber 31, a sufficient mixing space and time can be provided for nitrogen and tap water, so that the two can be better mixed.

[0026] As an improved specific implementation method, the fire extinguishing nozzle 3 is provided with an isolation cover 5 for covering the burning lithium battery, and the isolation cover 5 includes a hollow cover body 51, the upper end of the cover body 51 is sleeved on the fire extinguishing nozzle 3, and a purification channel 511 is opened in the side wall of the cover body 51, and the purification channel 511 extends in a spiral shape from top to bottom in the side wall of the cover body 51, and the upper end extends to the inner wall of the cover body 51 to communicate with the internal space of the cover body 51, and the lower end extends to the outer wall of the cover body 51 to communicate with the outside world. Activated carbon particles are attached to the channel wall of the purification channel 511. Through the setting of the isolation cover 5, the burning lithium battery can be isolated from the outside world, and through the setting of the purification channel 511, the toxic gas and polluted gas generated during the fire of the lithium battery can be effectively purified, and the method of extending the purification channel 511 in a spiral shape can maximize the contact time between the toxic gas and the activated carbon particles, thereby increasing the purification effect.

[0027] As an improved specific implementation method, an electric vacuum pump 6 is provided on the side wall of the fire extinguishing pipe 2 near the ejection device 4. The air inlet of the electric vacuum pump 6 is connected with the isolation cover 5 through the fire extinguishing pipe 2. The air outlet of the electric vacuum pump 6 is connected with the outside after being equipped with a filter. In this way, through the setting of the above-mentioned structure, the toxic gas generated by the fire of the lithium battery in the isolation cover 5 can be actively extracted, and then purified and discharged to the outside.

[0028] In summary, the fire extinguisher of this embodiment uses tap water and nitrogen as working media, which is low in cost and good in economy. For harmful gases generated by thermal runaway of lithium batteries, an isolation cover is used to isolate them, and an electric vacuum pump and a filter device are used to treat and purify them, effectively reducing the derivative disasters of lithium battery fires. At the same time, the fire extinguisher is light in weight, small in size, uses less water, has high fire extinguishing efficiency, and can effectively suppress lithium battery fires.

[0029] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A handheld low-pressure dual-fluid water mist lithium battery fire extinguisher, comprising a steel cylinder (1), a fire extinguishing pipe (2), a fire extinguishing nozzle (3) and a spraying device (4), wherein the spraying device (4) is mounted on the mouth of the steel cylinder (1), one end of the fire extinguishing pipe (2) is connected to the spraying device (4), and the other end is connected to the fire extinguishing nozzle (3), characterized in that: The steel cylinder (1) is provided with a vertical partition (11), the partition (11) divides the internal space of the steel cylinder (1) into a large chamber (12) and a small chamber (13), the large chamber (12) is connected to the spraying device (4), wherein the large chamber (12) is filled with high-pressure nitrogen, the small chamber (13) is filled with a combination of tap water and high-pressure nitrogen, and a siphon (14) is inserted into the small chamber (13), one end of the siphon (14) is connected to the spraying device (4), and the other end is inserted into the tap water; the fire extinguishing spray An isolation cover (5) for covering the ignited lithium battery is sleeved on the head (3); an electric vacuum pump (6) is provided on the side wall of the fire extinguishing pipe (2) near the ejection device (4); an air inlet of the electric vacuum pump (6) is connected to the isolation cover (5) through the fire extinguishing pipe (2); an air outlet of the electric vacuum pump (6) is connected to the outside after being provided with a filter; the fire extinguishing pipe (2) has a double-layer structure; the middle inner pipe is connected to the steel cylinder for passing the fire extinguishing material; the interlayer pipe is connected to the electric vacuum pump, and smoke is exhausted through the electric vacuum pump.

2. The handheld low-pressure dual-fluid water mist lithium battery fire extinguisher according to claim 1 is characterized in that: The spraying device (4) comprises a pressure gauge (41), an output valve (42) and a pressing handle (43). The output valve (42) is fixedly mounted at the mouth of the steel cylinder (1) to be connected to the large chamber (12) and the siphon tube (14) and to be in communication with each other. The pressure gauge (41) is fixed between the output valve (42) and the steel cylinder (1) to detect the pressure in the steel cylinder (1). The output valve (42) is linked to the pressing handle (43) and is controlled by the pressing handle (43) to press nitrogen and tap water into the fire extinguishing pipe (2) respectively.

3. The handheld low-pressure dual-fluid water mist lithium battery fire extinguisher according to claim 2 is characterized in that: The fire extinguishing nozzle (3) comprises a mixing chamber (31), a nitrogen interface (32), a tap water interface (33) and a nozzle (34); the nitrogen interface (32) and the tap water interface (33) are both fixed on the upper end surface of the mixing chamber (31) and communicate with the interior of the mixing chamber (31); the nozzle (34) is fixed on the lower end surface of the mixing chamber (31) and communicates with the interior of the mixing chamber (31); the nitrogen interface (32) and the tap water interface (33) are respectively connected to the nitrogen channel and the tap water channel in the fire extinguishing pipe (2) and communicate with each other.

4. The handheld low-pressure dual-fluid water mist lithium battery fire extinguisher according to claim 3 is characterized by: The isolation cover (5) comprises a hollow cover body (51), the upper end of the cover body (51) is sleeved on the fire extinguishing nozzle (3), a purification channel (511) is provided in the side wall of the cover body (51), the purification channel (511) extends in a spiral shape from top to bottom in the side wall of the cover body (51), the upper end extends to the inner side wall of the cover body (51) to communicate with the internal space of the cover body (51), and the lower end extends to the outer side wall of the cover body (51) to communicate with the outside, and activated carbon particles are attached to the channel wall of the purification channel (511).

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