CN215537988U - Fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent - Google Patents
Fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent Download PDFInfo
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- CN215537988U CN215537988U CN202120385293.5U CN202120385293U CN215537988U CN 215537988 U CN215537988 U CN 215537988U CN 202120385293 U CN202120385293 U CN 202120385293U CN 215537988 U CN215537988 U CN 215537988U
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- valve
- tank body
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- liquid nitrogen
- fire
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- 239000007788 liquid Substances 0.000 title claims abstract description 161
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 79
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 16
- 239000012774 insulation material Substances 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 239000011888 foil Substances 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 229920002635 polyurethane Polymers 0.000 claims abstract description 4
- 239000004814 polyurethane Substances 0.000 claims abstract description 4
- 239000011810 insulating material Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000007590 electrostatic spraying Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 238000005429 filling process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 150000001350 alkyl halides Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
A fire-fighting vehicle using liquid nitrogen as a fire extinguishing agent belongs to the technical field of special fire-fighting vehicles. Comprises a vehicle body, a tank body, a functional valve, a liquid nitrogen evaporator and a liquid nitrogen discharging mechanism. The tank body is made of special low-temperature-resistant steel plate materials and comprises an outer layer, a middle layer and an inner layer, wherein a heat insulation material layer is arranged between the outer layer and the middle layer and filled with polyurethane heat insulation materials, a vacuum layer is arranged between the middle layer and the inner layer, and an aluminum foil layer is arranged on the outer surface of the tank body. The functional valves comprise a pressure gauge valve, a pressure gauge, an evaporator valve, a safety valve, a liquid level meter, a vacuum pumping valve, a feeding valve, a liquid discharging valve, a liquid filling valve and an emptying valve. The inlet pipe orifice of the liquid nitrogen evaporator is connected with the outlet of the evaporator valve, and the inlet of the evaporator valve is connected with the lower part of the tank body. The tank body has good heat insulation effect, nitrogen does not leak under the pressure-resistant state of 0.8MPa at the temperature of liquid nitrogen-196 ℃, fire fighting and rapid temperature reduction are realized, the fire fighting is rapid, the environment is not polluted, and the material of a fire place are not damaged.
Description
Technical Field
The utility model belongs to the technical field of special fire-fighting and fire-extinguishing vehicles, and particularly relates to a fire-fighting and fire-extinguishing vehicle taking liquid nitrogen as a fire extinguishing agent.
Background
At present, fire extinguishing agents used for fire fighting at home and abroad mainly comprise water, foam, alkyl halide series, high-pressure carbon dioxide, low-pressure carbon dioxide and the like. The existing fire extinguishing agent is used, so that the secretary files and valuables are seriously polluted and damaged; the alkyl halide series fire extinguishing agent also has a destructive effect on the atmospheric ozone layer and is restricted and eliminated in the global range; the high-pressure carbon dioxide and the low-pressure carbon dioxide have certain influence on the effect of the atmospheric greenhouse. Utilize the liquid nitrogen as fire extinguishing agent, can absorb a large amount of heats in gasification, make the fire cool down rapidly, reach the effect of putting out a fire fast to nitrogen gas can not the polluted environment, can play the guard action to secretary archives, valuables etc.. Although nitrogen is known to have the best fire extinguishing effect, liquid nitrogen is difficult to store for a long time and is rarely applied in special emergency occasions. So far, fire-fighting and fire-extinguishing vehicles using liquid nitrogen as fire extinguishing agent are rare, and the liquid nitrogen storage tank has poor heat insulation performance due to poor heat insulation treatment, and serious liquid leakage can occur after long-term storage, and when a fire disaster occurs, the storage tank performance can not meet the specified requirements.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a fire fighting vehicle using liquid nitrogen as a fire extinguishing agent, which can store liquid nitrogen at-196 ℃ for a long period of time without loss and leakage, can be applied to a fire scene, can rapidly cool down, extinguish a fire, does not pollute the environment, can protect secretary files, valuables, etc., and can effectively solve the above problems.
The technical scheme of the utility model is as follows: a fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire-extinguishing agent is composed of vehicle body, tank, valves with different functions, liquid nitrogen evaporator and liquid nitrogen releasing mechanism.
The vehicle body carries the tank body and provides power for the ultralow temperature liquid pump in the liquid nitrogen discharge mechanism.
The tank body is a circular tank body with two ends provided with arched seal heads and is fixed on a chassis frame body of the vehicle body through a support plate. The tank body is made of special low-temperature-resistant steel plate materials and comprises an outer layer, a middle layer and an inner layer, wherein a heat insulation material layer is arranged between the outer layer and the middle layer, polyurethane heat insulation materials are filled in the tank body, vacuumizing treatment is carried out, a vacuum layer is arranged between the middle layer and the inner layer, vacuumizing treatment is carried out, and an aluminum foil layer is arranged on the outer surface of the tank body. The pressure of the tank body is 0.8MPa, and the tank body is suitable for constant pressure of-196 ℃ and does not leak.
The tank body is welded with a plurality of pipe joints and is provided with various functional valves, including a pressure gauge valve, a pressure gauge, an evaporator valve, a safety valve, a liquid level meter, a vacuum pumping valve, a feeding valve, a liquid discharge valve, a liquid filling valve and an emptying valve. The pressure gauge valve and the pressure gauge are arranged on the upper side of the side surface of the tank body, and are communicated with the inside of the tank body, so that the pressure in the tank body can be displayed at any time; the safety valve is positioned at the upper part of the tank body, the set safety pressure is 0.8MPa, and the safety valve is automatically opened when the pressure in the tank exceeds a set value so as to ensure the safety of the tank body; the liquid level meter valve and the liquid level meter are positioned at the upper part of the tank body and communicated with the inside of the tank body, and the liquid level meter can display the liquid nitrogen storage in the tank body; the vacuumizing valve is connected to the vacuum layer of the tank body, and after the tank body is manufactured, air in the vacuum layer is exhausted and the vacuum layer is kept in a vacuum state; the feed valve is connected into the heat insulation material layer of the tank body, sufficient heat insulation materials are filled into the heat insulation material layer through the feed valve, the heat insulation material layer is vacuumized, and the heat insulation material layer is kept in a vacuum state; the liquid discharge valve, the liquid charging valve and the evaporator valve are respectively positioned at the lower part of the tank body and are communicated with the interior of the tank body, the liquid discharge valve is connected with the ultralow-temperature liquid pump through a pipeline, the liquid charging valve is in a normally closed state and is opened when being connected with a liquid nitrogen filling pipeline for filling liquid nitrogen, the outlet of the evaporator valve is connected with a liquid nitrogen inlet at the lower part of the liquid nitrogen evaporator, and the evaporator valve is opened when the liquid nitrogen evaporator works; the emptying valve is positioned at the upper part of the tank body and communicated with the interior of the tank body, and is in a normally closed state, when liquid nitrogen is filled, the emptying valve is opened to facilitate the discharge of air in the tank, and the emptying valve is closed after the filling is finished.
The liquid nitrogen evaporator is arranged at the end socket side of the tank body, the inlet pipe orifice of the liquid nitrogen evaporator is connected with the outlet of the evaporator valve, and the inlet of the evaporator valve is connected with the lower part of the tank body. When the pressure in the tank is not enough during fire extinguishing, the evaporator valve is opened to vaporize the liquid nitrogen entering the evaporator, thereby increasing the pressure in the tank. The liquid nitrogen evaporator can be one of a coil natural air cooling type or a coil forced air cooling type.
The liquid nitrogen discharge mechanism comprises a nozzle, a hose, an ultralow temperature liquid pump and a liquid discharge valve. The nozzle and the hose are pre-installed together, the liquid discharge valve is in a normally closed state, when fire extinguishing is carried out, the liquid discharge valve is opened, the ultra-low temperature liquid pump is started, and the liquid nitrogen spraying pressure is increased. The hose can be one of a low-temperature-resistant soft fiber pipe or a low-temperature-resistant metal corrugated pipe.
The use method of the utility model comprises the following steps:
before liquid nitrogen is filled for the first time, the heat insulation material layer and the vacuum layer are ensured to be in a vacuum state, the safety valve, the liquid level meter valve, the pressure gauge valve and the emptying valve are in an open state, and the liquid discharge valve, the evaporator valve and the liquid filling valve are in a closed state.
And in the liquid nitrogen filling process, firstly, connecting a liquid nitrogen filling pipeline with a liquid filling valve, then opening the liquid filling valve for filling, paying attention to observe a liquid level meter in the filling process, closing the liquid filling valve in time when the liquid level meter is full, then closing the emptying valve 17, removing the liquid nitrogen filling pipeline, and completing filling.
In the fire fighting process, in the fire fighting site, the hose is connected with the outlet of the ultralow temperature liquid pump, the hose and the pre-installed nozzle are led to the position near a fire source and aligned with the fire point, then the liquid discharge valve is opened, the ultralow temperature liquid pump is started, and liquid nitrogen is sprayed to the fire point from the nozzle to extinguish the fire rapidly. When the pressure in the tank is insufficient, the evaporator valve is opened again, the pressure in the tank is increased under the action of the liquid nitrogen evaporator, the sprayed liquid nitrogen is guaranteed to have enough pressure, and the fire extinguishing effect is improved. When the liquid level meter displays that the liquid nitrogen in the tank is insufficient, the liquid discharge valve, the ultralow temperature liquid pump and the evaporator valve are closed, and the fire extinguishing is finished.
The utility model has the beneficial effects that: the tank body is formed by welding three layers of special low-temperature-resistant steel plate materials, and due to the existence of the heat insulation material layer, the vacuum layer and the outermost aluminum foil layer, the heat insulation effect can be effectively achieved, the pressure resistance of the tank body is guaranteed to be 0.8MPa, the tank body is adaptive to the constant pressure stability of 196 ℃ below zero, and nitrogen is not leaked; due to the existence of the liquid nitrogen evaporator, when the pressure in the tank is insufficient during fire extinguishing, the pressure in the tank can be increased through vaporization of liquid nitrogen after the tank is opened, and the fire extinguishing efficiency is ensured; thirdly, the liquid is vaporized to quickly cool, the fire is quickly extinguished, the environment is not polluted, and the material of the fire place is not damaged. The utility model is economical and practical, is applied to fire-fighting and cooling in industries such as industry, civil use, military industry and the like, and can generate remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1-vehicle body, 2-liquid nitrogen evaporator, 3-evaporator valve, 4-pressure gauge, 5-safety valve, 6-liquid level meter, 7-vacuum pumping valve, 8-feeding valve, 9-aluminum foil layer, 10-heat insulation material layer, 11-vacuum layer, 12-nozzle, 13-hose, 14-ultra-low temperature liquid pump, 15-liquid discharging valve, 16-liquid charging valve, 17-air discharging valve, 18-tank body and 19-support plate.
Detailed Description
The following describes in detail a specific embodiment of the liquid nitrogen storage tank according to the present invention with reference to the accompanying drawings.
As shown in figure 1, the fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent is composed of a vehicle body 1, a tank 18, various functional valves, a liquid nitrogen evaporator and a liquid nitrogen discharge mechanism.
The vehicle body 1 carries a tank 18 and powers an ultra-low temperature liquid pump 14 in a liquid nitrogen dispensing mechanism.
The tank body 18 is a circular tank body with two ends provided with arched seal heads and is fixed on a chassis frame body of the vehicle body 1 through a support plate 19. The tank body 18 is made of special low-temperature resistant steel plate materials and comprises an outer layer, a middle layer and an inner layer, wherein a heat insulation material layer 10 is arranged between the outer layer and the middle layer, polyurethane heat insulation materials are filled in the tank body, vacuumizing treatment is carried out, a vacuum layer 11 is arranged between the middle layer and the inner layer, vacuumizing treatment is carried out, and the outer surface of the tank body 18 is an aluminum foil layer 9 formed after polishing and electrostatic spraying treatment by aluminum foil powder. The pressure of the tank body 18 is 0.8MPa, and the tank body is suitable for constant pressure of-196 ℃ and does not leak.
The tank body 18 is welded with a plurality of pipe joints and is provided with various functional valves, including a pressure gauge valve and a pressure gauge 4, a safety valve 5, a liquid level gauge valve and a liquid level gauge 6, a vacuum pumping valve 7, a feeding valve 8, a liquid discharging valve 15, a liquid filling valve 16 and an emptying valve 17. The pressure gauge valve and the pressure gauge 4 are arranged on the upper side of the side surface of the tank body 18 and communicated with the inside of the tank body 18, so that the pressure in the tank body 18 can be displayed at any time; the safety valve 5 is positioned at the upper part of the tank body 18, the set safety pressure is 0.8MPa, and when the pressure in the tank exceeds the set value, the safety valve is automatically opened to ensure the safety of the tank body 10; the liquid level meter valve and the liquid level meter 6 are positioned at the upper part of the tank body 18 and communicated with the inside of the tank body 18, and the liquid level meter 6 can display the liquid nitrogen storage in the tank body 18; the vacuumizing valve 7 is connected to the vacuum layer 11 of the tank body 18, after the tank body 18 is manufactured, a vacuumizing pump is arranged on the vacuumizing valve 7 to exhaust air in the vacuum layer 11, then the vacuumizing valve 7 is closed, and the vacuumizing pump is removed to keep the vacuum state in the vacuum layer 11; the feed valve 8 is connected into the heat insulating material layer 10 of the tank body 18, the heat insulating material layer 10 is filled with enough heat insulating material through the feed valve 8, then a vacuum-pumping pump is arranged to keep the interior of the heat insulating material layer 10 in a vacuum state, then the feed valve 8 is closed, and the vacuum-pumping pump is removed to keep the interior of the vacuum layer 11 in the vacuum state; the liquid discharge valve 15 and the liquid charging valve 16 are respectively positioned at the lower part of the tank body 18 and communicated with the inside of the tank body 18, the liquid discharge valve 15 is connected with the ultralow temperature liquid pump 14 through a pipeline, and the liquid charging valve 16 is in a normally closed state and is opened when being connected with a liquid nitrogen filling pipeline and liquid nitrogen is filled; the emptying valve 17 is positioned at the upper part of the tank body 18 and communicated with the interior of the tank body 18, the emptying valve 17 is in a normally closed state, when liquid nitrogen is filled, the emptying valve 17 is opened to facilitate the discharge of air in the tank, and the emptying valve 17 is closed after the filling is finished.
The liquid nitrogen evaporator 2 is of a coil pipe type structure and is arranged on the sealing end side of the tank body 18, the inlet pipe orifice of the liquid nitrogen evaporator 2 is connected with the outlet of the evaporator valve 3, and the inlet of the evaporator valve 3 is connected with the lower part of the tank body 18. When the pressure in the tank is insufficient during fire extinguishing, the evaporator valve 3 is opened to vaporize the liquid nitrogen entering the evaporator 2 and increase the pressure in the tank.
The liquid nitrogen discharge mechanism comprises a nozzle 12, a hose 13, an ultra-low temperature liquid pump 14 and a drain valve 15. The nozzle 12 and the hose 13 are pre-installed together, the liquid discharge valve 15 is in a normally closed state, and when fire extinguishing is carried out, the liquid discharge valve 15 is opened, the ultralow temperature liquid pump 14 is started, and the liquid nitrogen spraying pressure is increased.
The use method of the utility model comprises the following steps:
before liquid nitrogen is filled for the first time, the heat insulation material layer 10 and the vacuum layer 11 are ensured to be in a vacuum state, the safety valve 5, the liquid level meter valve, the pressure gauge valve and the emptying valve 17 are in an open state, and the liquid discharge valve 15, the evaporator valve 3 and the liquid charging valve 16 are in a closed state.
In the liquid nitrogen filling process, a liquid filling pipeline is connected with a liquid filling valve 16, then filling is carried out, in the filling process, attention is paid to observing the liquid level meter 6, when the liquid level meter is full, the liquid filling valve 16 is closed in time, then an emptying valve 17 is closed, and filling is finished.
In the fire fighting process, when the fire fighting site is reached, the hose 13 is firstly connected with the outlet of the ultra-low temperature liquid pump 14, the hose 13 and the pre-installed nozzle 12 are led to the position near a fire source and aligned with the fire point, then the liquid discharge valve 15 is opened, the ultra-low temperature liquid pump 14 is started, and liquid nitrogen is sprayed to the fire point from the nozzle 12 to quickly extinguish the fire. When the pressure in the tank is insufficient, the evaporator valve 3 is opened again, the pressure in the tank is increased under the action of the evaporator 2, the sprayed liquid nitrogen is ensured to have enough pressure, and the fire extinguishing effect is improved. When the liquid level meter displays that the liquid nitrogen in the tank is insufficient, the liquid discharge valve 15, the ultralow temperature liquid pump 14 and the evaporator valve 3 are closed, and the fire extinguishing is finished.
After the fire extinguishing work is finished, liquid nitrogen is refilled for reuse.
It should be noted that this embodiment is one of the preferred embodiments of the present invention, and all simple modifications made according to this embodiment are within the scope of the present invention.
Claims (4)
1. A fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent is composed of a vehicle body (1), a tank body (18), a functional valve, a liquid nitrogen evaporator and a liquid nitrogen discharge mechanism,
the vehicle body (1) bears a tank body (18) and provides power for an ultralow temperature liquid pump (14) in the liquid nitrogen discharge mechanism;
the tank body (18) is a circular tank body with two ends provided with arched end sockets and is fixed on a chassis frame body of the vehicle body (1) through a support plate (19), the tank body (18) is made of special low-temperature-resistant steel plate materials and comprises an outer layer, a middle layer and an inner layer, a heat-insulating material layer (10) is arranged between the outer layer and the middle layer, polyurethane heat-insulating materials are filled in the tank body and vacuumized, a vacuum layer (11) is arranged between the middle layer and the inner layer and vacuumized, and the outer surface of the tank body (18) is an aluminum foil layer (9) formed after polishing and electrostatic spraying treatment by aluminum foil powder;
a plurality of pipe joints are welded on the tank body (18) and functional valves are arranged, wherein the functional valves comprise a pressure gauge valve, a pressure gauge (4), a safety valve (5), a liquid level meter valve, a liquid level meter (6), a vacuum pumping valve (7), a feeding valve (8), a liquid discharging valve (15), a liquid filling valve (16), an emptying valve (17) and an evaporator valve (3);
the liquid nitrogen evaporator (2) is arranged at the end socket side of the tank body (18), a liquid nitrogen inlet pipe orifice of the liquid nitrogen evaporator (2) is positioned at the lower part and is connected with an outlet of the evaporator valve (3), and a nitrogen outlet of the liquid nitrogen evaporator (2) is positioned at the upper part and is communicated with the tank body (18);
the liquid nitrogen discharging mechanism comprises a nozzle (12), a hose (13), an ultralow temperature liquid pump (14) and a liquid discharge valve (15), wherein the nozzle (12) and the hose (13) are pre-installed together, the ultralow temperature liquid pump (14) is communicated with the liquid discharge valve (15), and the liquid discharge valve (15) is communicated with the lower part of a tank body (18).
2. A fire fighting vehicle using liquid nitrogen as fire extinguishing agent according to claim 1, characterized in that the pressure gauge valve and the pressure gauge (4) are installed on the upper side of the tank (18) and connected to the inside of the tank (18); the safety valve (5) is positioned at the upper part of the tank body (18), and the safety pressure is set to be 0.8 MPa; the liquid level meter valve and the liquid level meter (6) are positioned at the upper part of the tank body (18) and communicated with the inside of the tank body (18); the vacuumizing valve (7) is connected to the vacuum layer (11) of the tank body (18), and after the vacuum layer (11) is vacuumized, the vacuumizing valve (7) is in a normally closed state; the feed valve (8) is connected into the heat insulation material layer (10) of the tank body (18), sufficient heat insulation material is filled into the heat insulation material layer (10) through the feed valve (8), and after the vacuum pumping treatment, the feed valve (8) is in a normally closed state; the inlets of the liquid discharge valve (15), the liquid charging valve (16) and the evaporator valve (3) are respectively positioned at the lower part of the tank body (18) and communicated with the inside of the tank body (18).
3. A fire fighting vehicle using liquid nitrogen as a fire extinguishing agent according to claim 1, wherein the liquid nitrogen evaporator (2) is one of a coil natural air cooling type and a coil forced air cooling type.
4. A fire fighting vehicle using liquid nitrogen as a fire extinguishing agent according to claim 1, wherein the hose (13) of the liquid nitrogen dispensing mechanism is one of a soft fiber pipe or a metal bellows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120385293.5U CN215537988U (en) | 2021-02-08 | 2021-02-08 | Fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120385293.5U CN215537988U (en) | 2021-02-08 | 2021-02-08 | Fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215537988U true CN215537988U (en) | 2022-01-18 |
Family
ID=79838450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120385293.5U Expired - Fee Related CN215537988U (en) | 2021-02-08 | 2021-02-08 | Fire-fighting and fire-extinguishing vehicle using liquid nitrogen as fire extinguishing agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215537988U (en) |
-
2021
- 2021-02-08 CN CN202120385293.5U patent/CN215537988U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220118 |