Liquid nitrogen fire extinguishing device

Abstract

The utility model discloses a liquid nitrogen fire extinguishing device, which relates to the field of fire extinguishing equipment and comprises a main high-pressure nitrogen cylinder, a standby high-pressure nitrogen cylinder, a three-way valve, a heat exchanger, a liquid nitrogen gas-liquid separator, a liquid nitrogen tank and a liquid nitrogen spray head, a cylinder valve of the main high-pressure nitrogen cylinder is connected with a main pressure reducing valve, a cylinder valve of the standby high-pressure nitrogen cylinder is connected with a standby pressure reducing valve, a first inlet of the three-way valve is connected with the main pressure reducing valve, a second inlet of the three-way valve is connected with the standby pressure reducing valve, and an outlet of the three-way valve is connected with a nitrogen inlet of the heat exchanger. A liquid outlet of the liquid nitrogen gas-liquid separator is connected with an inlet of the liquid nitrogen tank, an inlet of the liquid nitrogen gas-liquid separator is connected with a nitrogen and liquid nitrogen outlet of the heat exchanger, a gas outlet of the liquid nitrogen separator is connected with a nitrogen inlet of the heat exchanger, an outlet of the liquid nitrogen tank is connected with a first control valve, and the first control valve is connected with a liquid nitrogen output pipeline. And the liquid nitrogen output pipeline is connected with the liquid nitrogen spray head. The reliability of the liquid nitrogen fire extinguishing device is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of liquid nitrogen fire extinguishing technology, and in particular to a liquid nitrogen fire extinguishing device. Background Technology

[0002] Liquid nitrogen fire suppression and explosion control devices can extinguish open flames within 5 seconds and prevent reignition of lithium-ion batteries through the highly efficient cooling effect of liquid nitrogen. Simultaneously, the vaporized liquid nitrogen fills the confined space of the prefabricated compartment, achieving efficient inerting and explosion suppression, making it suitable for fire safety protection in lithium battery application sites such as energy storage power stations and data centers. However, if the liquid nitrogen level in existing liquid nitrogen fire suppression and explosion control devices cannot be guaranteed in a timely manner, the reliability of fire suppression will be affected. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model proposes a liquid nitrogen fire extinguishing device.

[0004] The present invention discloses a liquid nitrogen fire extinguishing device, comprising: a main high-pressure nitrogen cylinder, a backup high-pressure nitrogen cylinder, a three-way valve, a heat exchanger, a liquid nitrogen gas-liquid separator, a liquid nitrogen tank, and a liquid nitrogen nozzle;

[0005] The main high-pressure nitrogen cylinder is connected to a main pressure reducing valve, the backup high-pressure nitrogen cylinder is connected to a backup pressure reducing valve, the first inlet of the three-way valve is connected to the main pressure reducing valve, the second inlet of the three-way valve is connected to the backup pressure reducing valve, and the outlet of the three-way valve is connected to the nitrogen inlet of the heat exchanger.

[0006] The liquid nitrogen gas-liquid separator is installed on the liquid nitrogen tank, and the liquid outlet of the liquid nitrogen gas-liquid separator is connected to the inlet of the liquid nitrogen tank. The inlet of the liquid nitrogen gas-liquid separator is connected to the nitrogen and liquid nitrogen outlets of the heat exchanger, and the gas outlet of the liquid nitrogen separator is connected to the nitrogen inlet of the heat exchanger.

[0007] The outlet of the liquid nitrogen tank is connected to a first control valve, which is connected to a liquid nitrogen output pipeline, which is connected to a liquid nitrogen nozzle.

[0008] Preferably, there are multiple liquid nitrogen nozzles and multiple liquid nitrogen output pipelines, and each liquid nitrogen output pipeline is equipped with a second control valve.

[0009] Preferably, it also includes a controller, and both the first control valve and the second control valve are electrically connected to the controller.

[0010] Preferably, the liquid nitrogen tank is also equipped with a level gauge for detecting the liquid nitrogen level in the tank. The level gauge is electrically connected to the controller, and the controller is electrically connected to an alarm.

[0011] Preferably, a first pressure gauge is connected between the main pressure reducing valve and the first inlet, and a second pressure gauge is connected between the standby pressure reducing valve and the second inlet.

[0012] Preferably, a first flow meter is connected between the first pressure gauge and the first inlet, and a second flow meter is connected between the second pressure gauge and the second inlet, which can adjust the nitrogen flow rate to ensure the efficiency of liquid nitrogen replenishment.

[0013] Preferably, the liquid nitrogen tank includes a tank body, an insulation layer, and a protective layer arranged sequentially from the inside out.

[0014] Preferably, the liquid nitrogen gas-liquid separator is further provided with an insulation layer for heat preservation or a cooling mechanism for cooling.

[0015] The proposed liquid nitrogen fire extinguishing device, by setting up a main high-pressure nitrogen cylinder, a backup high-pressure nitrogen cylinder, a three-way valve, a heat exchanger, and a liquid nitrogen gas-liquid separator, can replenish liquid nitrogen in a timely manner when the liquid nitrogen in the liquid nitrogen tank is insufficient, ensuring the liquid nitrogen in the liquid nitrogen tank, effectively improving the reliability of the liquid nitrogen fire extinguishing device, and effectively avoiding the waste of unliquefied nitrogen separated by the liquid nitrogen separator during the replenishment process. Attached Figure Description

[0016] Figure 1 This is a block diagram of a liquid nitrogen fire extinguishing device in one embodiment of the present invention. Detailed Implementation

[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Reference Figure 1 The present invention proposes a liquid nitrogen fire extinguishing device, comprising: a main high-pressure nitrogen cylinder 1, a spare high-pressure nitrogen cylinder, a three-way valve 3, a heat exchanger 4, a liquid nitrogen gas-liquid separator 5, a liquid nitrogen tank 6, and a liquid nitrogen nozzle 7.

[0019] The main high-pressure nitrogen cylinder 1 is connected to the main pressure reducing valve 2, the spare high-pressure nitrogen cylinder is connected to the spare pressure reducing valve, the first inlet of the three-way valve 3 is connected to the main pressure reducing valve 2, the second inlet of the three-way valve 3 is connected to the spare pressure reducing valve, and the outlet of the three-way valve 3 is connected to the nitrogen inlet of the heat exchanger 4.

[0020] The liquid nitrogen gas-liquid separator 5 is installed on the liquid nitrogen tank 6, and the liquid outlet of the liquid nitrogen gas-liquid separator 5 is connected to the inlet of the liquid nitrogen tank 6. The inlet of the liquid nitrogen gas-liquid separator 5 is connected to the nitrogen and liquid nitrogen outlet of the heat exchanger 4, and the gas outlet of the liquid nitrogen separator is connected to the nitrogen inlet of the heat exchanger 4.

[0021] The outlet of the liquid nitrogen tank 6 is connected to a first control valve, which is connected to a liquid nitrogen output pipeline. The liquid nitrogen output pipeline is connected to a liquid nitrogen nozzle 7, which is installed inside the battery box. The heat exchanger 7 is used to cool nitrogen gas into liquid nitrogen.

[0022] This embodiment, by setting up a main high-pressure nitrogen cylinder 1, a backup high-pressure nitrogen cylinder, a three-way valve 3, a heat exchanger 4, and a liquid nitrogen gas-liquid separator 5, can replenish liquid nitrogen in the liquid nitrogen tank 6 in a timely manner when the liquid nitrogen volume is insufficient, ensuring that the liquid nitrogen volume and pressure in the liquid nitrogen tank 6 are constant, effectively improving the reliability of the liquid nitrogen fire extinguishing device, and effectively avoiding the waste of unliquefied nitrogen separated by the liquid nitrogen separator during the replenishment process.

[0023] In this embodiment, the liquid nitrogen gas-liquid separator 5 is also provided with an insulation layer for heat preservation or a cooling mechanism for cooling.

[0024] This embodiment is configured in such a way that the liquid nitrogen gas-liquid separator 5 can be kept cold, so that the temperature of the liquid nitrogen gas-liquid separator 5 does not exceed the preset temperature, thereby effectively preventing the already hydraulically pumped liquid nitrogen from turning back into gas.

[0025] In this embodiment, there are multiple liquid nitrogen nozzles 7 and multiple liquid nitrogen output pipelines, and each liquid nitrogen output pipeline is equipped with a second control valve.

[0026] In practice, multiple liquid nitrogen nozzles 7 are connected to multiple liquid nitrogen output pipelines in a one-to-one correspondence. Each liquid nitrogen output pipeline is connected to a first control valve, and each liquid nitrogen output pipeline is equipped with a second control valve to facilitate precise suppression of explosion and fire extinguishing of the corresponding battery box.

[0027] In a further embodiment, a controller is also included, and both the first control valve and the second control valve are electrically connected to the controller so that they can be automatically activated in a timely manner to extinguish fires and suppress explosions when the controller receives a fire extinguishing command.

[0028] In this embodiment, the liquid nitrogen tank 6 is also equipped with a level gauge for detecting the liquid nitrogen level in the liquid nitrogen tank 6. The level gauge is electrically connected to the controller, and the controller is electrically connected to an alarm.

[0029] This embodiment is configured in such a way that it can promptly remind staff to replenish liquid nitrogen when the liquid nitrogen level in liquid nitrogen tank 6 is insufficient.

[0030] To ensure safety during the liquid nitrogen replenishment process, in this embodiment, a first pressure gauge is connected between the main pressure reducing valve 2 and the first inlet, and a second pressure gauge is connected between the standby pressure reducing valve and the second inlet.

[0031] In a further embodiment, a first flow meter is connected between the first pressure gauge and the first inlet, and a second flow meter is connected between the second pressure gauge and the second inlet, which can adjust the speed of nitrogen gas, thereby ensuring the efficiency of liquid nitrogen replenishment.

[0032] In this embodiment, the liquid nitrogen tank 6 includes a tank body, a heat insulation layer, and a protective layer arranged sequentially from the inside out.

[0033] In a further embodiment, the insulation layer is a vacuum insulation layer.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A liquid nitrogen fire extinguishing apparatus, characterized by, It comprises: A main high-pressure nitrogen cylinder (1), a spare high-pressure nitrogen cylinder, a three-way valve (3), a heat exchanger (4), a liquid nitrogen gas-liquid separator (5), a liquid nitrogen tank (6) and a liquid nitrogen spray head (7); The cylinder valve of the main high-pressure nitrogen cylinder (1) is connected with a main pressure reducing valve (2), the cylinder valve of the spare high-pressure nitrogen cylinder is connected with a spare pressure reducing valve, the first inlet of the three-way valve (3) is connected with the main pressure reducing valve (2), the second inlet of the three-way valve (3) is connected with the spare pressure reducing valve, and the outlet of the three-way valve (3) is connected with the nitrogen inlet of the heat exchanger (4); The liquid nitrogen gas-liquid separator (5) is arranged on the liquid nitrogen tank (6), the liquid outlet of the liquid nitrogen gas-liquid separator (5) is connected with the inlet of the liquid nitrogen tank (6), the inlet of the liquid nitrogen gas-liquid separator (5) is connected with the nitrogen and liquid nitrogen outlet of the heat exchanger (4), and the gas outlet of the liquid nitrogen separator is connected with the nitrogen inlet of the heat exchanger (4); The outlet of the liquid nitrogen tank (6) is connected with a first control valve, the first control valve is connected with a liquid nitrogen output pipeline, and the liquid nitrogen output pipeline is connected with the liquid nitrogen spray head (7).

2. The liquid nitrogen fire extinguishing apparatus of claim 1, wherein, The liquid nitrogen spray head (7) is multiple, and the liquid nitrogen output pipeline is multiple, and a second control valve is arranged on each liquid nitrogen output pipeline.

3. The liquid nitrogen fire extinguishing apparatus of claim 2, wherein, It also comprises a controller, and the first control valve and the second control valve are electrically connected with the controller.

4. The liquid nitrogen fire extinguishing apparatus of claim 3, wherein, The liquid level meter for detecting the liquid nitrogen height in the liquid nitrogen tank (6) is further arranged on the liquid nitrogen tank (6), the liquid level meter is electrically connected with the controller, and the controller is electrically connected with an alarm.

5. The liquid nitrogen fire extinguishing apparatus of claim 1, wherein, The first pressure table is connected between the first inlet and the main pressure reducing valve (2), and the second pressure table is connected between the second inlet and the spare pressure reducing valve.

6. The liquid nitrogen fire extinguishing apparatus of claim 5, wherein, The first flowmeter is connected between the first pressure table and the first inlet, and the second flowmeter is connected between the second pressure table and the second inlet, so as to adjust the speed of nitrogen and ensure the efficiency of supplementing liquid nitrogen.

7. The liquid nitrogen fire extinguishing apparatus of claim 1, wherein The liquid nitrogen tank (6) comprises a tank body, a heat insulation layer and a protective layer arranged in sequence from inside to outside.

8. The liquid nitrogen fire extinguishing apparatus of claim 1, wherein, The liquid nitrogen gas-liquid separator (5) is further provided with a heat preservation layer for heat preservation or a cooling mechanism for cooling.

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