Liquid nitrogen supply system

Abstract

The present application discloses a liquid nitrogen supply system. The liquid nitrogen supply system comprises a liquid storage tank, a delivery pipe, and a flow rate regulating mechanism. In a liquid nitrogen delivery direction, the delivery pipe has an inlet end and an outlet end which are communicated with the liquid storage tank. The flow rate regulating mechanism comprises a gas-liquid separator, a gas storage tank, a first control valve and a second control valve, wherein a first liquid inlet end of the gas-liquid separator is communicated with the side of the delivery pipe close to the inlet end, a first liquid outlet end of the gas-liquid separator is communicated with the side of the delivery pipe close to the outlet end, a first gas outlet end of the gas-liquid separator is communicated with the gas storage tank, the first control valve is arranged in the delivery pipe and is communicated with the gas-liquid separator, a second gas outlet end of the gas storage tank is communicated with the delivery pipe, a communication point between the second gas outlet end and the delivery pipe is located on the side of a communication point between the first liquid inlet end and the delivery pipe close to the inlet end, and the second control valve is connected between the second gas outlet end and the delivery pipe. The liquid nitrogen supply system adjusts the liquid nitrogen delivery amount on the basis of the liquid nitrogen consumption of a liquid nitrogen-consuming device.

Description

Liquid nitrogen supply system Technical Field

[0001] This application relates to the field of liquid nitrogen transportation, and in particular to a liquid nitrogen supply system. Background Technology

[0002] In related technologies, liquid nitrogen supply systems are used to deliver liquid nitrogen to liquid nitrogen-using equipment. However, under different usage conditions, it is difficult for the liquid nitrogen-using equipment to maintain a consistent amount of liquid nitrogen. The liquid nitrogen supply system can only deliver liquid nitrogen according to a preset liquid nitrogen delivery amount, and it is difficult for the liquid nitrogen supply system to adjust the liquid nitrogen delivery amount according to the usage of the liquid nitrogen-using equipment. Summary of the Invention

[0003] In order to enable the liquid nitrogen supply system to adjust the liquid nitrogen delivery rate according to the amount of liquid nitrogen used, this application provides a liquid nitrogen supply system.

[0004] The liquid nitrogen supply system provided in this application adopts the following technical solution:

[0005] A liquid nitrogen supply system includes: a storage tank and a delivery pipeline, the storage tank being used to store liquid nitrogen, the delivery pipeline having an inlet end and an outlet end along the liquid nitrogen delivery direction of the delivery pipeline, the inlet end of the delivery pipeline being connected to the storage tank, and the delivery pipeline being used to deliver liquid nitrogen.

[0006] The speed regulating mechanism includes a gas-liquid separator, a gas storage tank, a first control valve, and a second control valve. The first liquid inlet of the gas-liquid separator is connected to the side of the conveying pipeline near the inlet end. The first liquid outlet of the gas-liquid separator is connected to the side of the conveying pipeline near the outlet end. The first gas outlet of the gas-liquid separator is connected to the first gas inlet of the gas storage tank. The first control valve is located in the conveying pipeline and connected to the gas-liquid separator. The first control valve is used to connect or block the first liquid inlet and the conveying pipeline to control the flow direction of liquid nitrogen in the conveying pipeline. The second gas outlet of the gas storage tank is connected to the conveying pipeline, and the connection point between the second gas outlet and the conveying pipeline is located on the side of the connection point between the first liquid inlet and the conveying pipeline near the inlet end. The second control valve is connected between the second gas outlet and the conveying pipeline. The second control valve is used to connect or block the second gas outlet and the conveying pipeline. The gas storage tank is used to store nitrogen and to convey nitrogen to the conveying pipeline.

[0007] By adopting the above technical solution, the gas-liquid separator and the delivery pipeline are connected or blocked by the first control valve, so that the gas-liquid separator separates liquid nitrogen and nitrogen gas in the delivery pipeline, and the nitrogen gas is stored in the storage tank. The pressure in the delivery pipeline decreases to reduce the delivery speed of liquid nitrogen in the delivery pipeline, thereby reducing the liquid nitrogen delivery volume of the liquid nitrogen supply system. The gas-liquid separator and the delivery pipeline are connected or blocked by the second control valve, so that the nitrogen gas in the storage tank flows into the delivery pipeline. The pressure in the delivery pipeline increases to increase the delivery speed of liquid nitrogen in the delivery pipeline, thereby increasing the liquid nitrogen delivery volume of the liquid nitrogen supply system. Compared with the prior art, the liquid nitrogen supply system can adjust the liquid nitrogen delivery volume according to the liquid nitrogen usage of the liquid nitrogen-using equipment, thereby improving the user experience of the liquid nitrogen supply system.

[0008] Preferably, there are multiple conveying pipes, which are spaced apart. Each conveying pipe is connected to the gas-liquid separator and the first control valve. The first air outlet of each gas-liquid separator is connected to the first air inlet. The second control valve has a second air inlet and multiple third air outlets. The second air inlet is connected to the second air outlet, and the multiple third air outlets correspond one-to-one with and are connected to the multiple conveying pipes. The second control valve is used to connect or block one or more of the second air inlet and the multiple third air outlets.

[0009] By adopting the above technical solution, and by installing a gas-liquid separator in each conveying pipeline, when it is necessary to reduce the conveying speed of liquid nitrogen in the conveying pipeline, the gas-liquid separator separates the nitrogen in the corresponding conveying pipeline. The separated nitrogen is stored in a gas storage tank. The gas storage tank and one or more of the multiple conveying pipelines are connected or disconnected through a second control valve. The gas storage tank can supply nitrogen to one or more of the multiple conveying pipelines. The liquid nitrogen supply system can use the nitrogen separated from the conveying pipeline to increase the conveying speed of liquid nitrogen in the corresponding conveying pipeline, thereby achieving the technical effect of dynamically adjusting the conveying speed of liquid nitrogen in multiple conveying pipelines.

[0010] Preferably, the liquid nitrogen supply system further includes: a third control valve, which is connected between the storage tank and the plurality of delivery pipes. The third control valve has a second inlet and a plurality of second outlets. The second inlet is connected to the storage tank, and the plurality of second outlets are corresponding to and connected to the plurality of delivery pipes. The third control valve is used to connect or block one or more of the second inlet and the plurality of second outlets.

[0011] By adopting the above technical solution, when a liquid nitrogen user connected to a delivery pipeline stops using liquid nitrogen, the third control valve blocks the second inlet and the corresponding second outlet, as well as the connection between the second inlet and the remaining second outlet. The storage tank then delivers liquid nitrogen to the delivery pipeline connected to the storage tank. This prevents the storage tank from continuously delivering liquid nitrogen to the delivery pipeline connected to the liquid nitrogen user that has stopped using liquid nitrogen. It also prevents the liquid nitrogen output from the storage tank from being distributed, which would cause the liquid nitrogen delivery volume in the delivery pipeline connected to the storage tank to fall short of the preset liquid nitrogen delivery volume. This improves the operational reliability of the liquid nitrogen supply system.

[0012] Preferably, the liquid nitrogen supply system further includes: a flow meter and a controller. The flow meter is installed in the delivery pipeline and is used to detect the flow rate of liquid nitrogen in the delivery pipeline. The controller is communicatively connected to the first control valve, the second control valve, and the flow meter. The controller is used to receive a flow rate adjustment signal, compare the flow rate adjustment signal with the detection signal of the flow meter, and generate a control signal. The controller is also used to control the working state of the first control valve and the working state of the second control valve according to the control signal.

[0013] By adopting the above technical solution, the flow rate of liquid nitrogen in the delivery pipeline is detected by a flow meter. When the liquid nitrogen usage of the liquid nitrogen-using equipment changes, the operator sends a flow rate adjustment signal to the controller. The controller compares the flow rate adjustment signal with the detection signal of the flow meter to determine the difference between the liquid nitrogen delivery volume of the delivery pipeline and the change in liquid nitrogen usage of the liquid nitrogen-using equipment, and generates a control signal. The controller controls the first control valve to connect or disconnect the delivery pipeline and the gas-liquid separator, and controls the second control valve to connect or disconnect the gas storage tank of the delivery pipeline, thereby adjusting the liquid nitrogen delivery volume of the delivery pipeline. This achieves the technical effect of adjusting the liquid nitrogen delivery volume of the delivery pipeline according to the change in liquid nitrogen usage of the liquid nitrogen-using equipment.

[0014] Preferably, the liquid nitrogen supply system further includes: a first throttle valve and a pressure detection device, wherein the first throttle valve is connected between the second control valve and the delivery pipeline, the pressure detection device is disposed in the delivery pipeline, and the pressure detection device is used to detect the pressure in the delivery pipeline; both the first throttle valve and the pressure detection device are communicatively connected to the controller, and the controller is also used to control the first throttle valve to adjust the flow rate of nitrogen according to the detection signal of the pressure detection device.

[0015] By adopting the above technical solution, the storage tank delivers nitrogen to the delivery pipeline. When the pressure in the delivery pipeline exceeds the preset pressure range, the pressure detection device is triggered and sends a detection signal to the controller. The controller controls the first throttle valve to reduce the flow rate of nitrogen based on the detection signal from the pressure detection device. This can prevent the delivery pipeline from cracking due to excessive pressure and causing liquid nitrogen leakage, and can also prevent the delivery pipeline from bursting, thereby improving the safety of the liquid nitrogen supply system.

[0016] Preferably, the liquid nitrogen supply system further includes a second throttle valve, which is located in the delivery pipeline and is used to control the flow rate of liquid nitrogen in the delivery pipeline.

[0017] By adopting the above technical solution, when the liquid nitrogen usage of the liquid nitrogen-using equipment is large, the operator controls the second throttle valve to increase the flow rate of liquid nitrogen in the delivery pipeline; when the liquid nitrogen usage of the liquid nitrogen-using equipment is small, the operator controls the second throttle valve to decrease the flow rate of liquid nitrogen in the delivery pipeline. This achieves the technical effect of adjusting the liquid nitrogen delivery volume according to the liquid nitrogen usage of the liquid nitrogen-using equipment.

[0018] Preferably, the liquid nitrogen supply system further includes a leak detection device, which is disposed in the delivery pipeline and is used to detect whether liquid nitrogen is leaking in the delivery pipeline and to generate a leak signal.

[0019] By adopting the above technical solution, a leak detection device is used to detect whether liquid nitrogen is leaking in the delivery pipeline. When liquid nitrogen leaks in the delivery pipeline, the leak detection device is triggered and generates a leak signal. The operator controls the third control valve to block the storage tank and the delivery pipeline where the liquid nitrogen leaks, thereby reducing the amount of liquid nitrogen leakage and improving the working reliability of the liquid nitrogen supply system.

[0020] Preferably, the liquid storage tank includes a tank body, a heat insulation layer, a reflective layer, and a protective layer. The heat insulation layer is disposed on the outer peripheral wall of the tank body, the reflective layer is disposed on the outer peripheral wall of the heat insulation layer, and the protective layer is disposed on the outer peripheral wall of the heat insulation layer. The heat insulation layer is used to block heat conducted from the external environment to the tank body, and the reflective layer is used to reflect heat from the external environment.

[0021] By adopting the above technical solution, and by setting a heat insulation layer, a reflective layer, and a protective layer on the outer peripheral wall of the tank, the heat insulation layer can block the heat conducted from the external environment to the tank, and the reflective layer can reflect the heat conducted from the external environment to the tank, so that the temperature inside the tank is maintained within a preset temperature range. This can prevent the temperature inside the tank from becoming too high and causing liquid nitrogen to vaporize into nitrogen gas, thereby reducing the amount of liquid nitrogen lost. Furthermore, by setting a protective layer to protect the tank, the heat insulation layer, and the reflective layer, wear on the tank, the heat insulation layer, and the reflective layer can be reduced, thereby improving the service life of the liquid storage tank.

[0022] Preferably, the liquid nitrogen supply system further includes an alarm device and a controller. The tank is equipped with a first temperature detector and a liquid level detector. The first temperature detector is used to detect the temperature inside the tank, and the liquid level detector is used to detect the liquid nitrogen level in the tank. The first temperature detector, the liquid level detector, and the alarm device are all communicatively connected to the controller. The controller is used to activate the alarm device to sound an alarm based on the detection signal from the first temperature detector and / or the detection signal from the liquid level detector.

[0023] By adopting the above technical solution, when the temperature inside the storage tank exceeds the preset temperature, the first temperature detection element is triggered and sends a detection signal to the controller. The controller then controls the alarm device to sound an alarm based on the detection signal from the first temperature detection element. The operator adjusts the temperature inside the storage tank according to the alarm signal, thereby preventing the liquid nitrogen from vaporizing into nitrogen gas due to excessively high temperatures, reducing liquid nitrogen loss, and improving the reliability of the liquid nitrogen supply system. Furthermore, when the liquid nitrogen level in the storage tank falls below the preset level, the liquid level detection element is triggered and sends a detection signal to the controller. The controller then controls the alarm device to sound an alarm based on the detection signal from the liquid level detection element. The operator adds liquid nitrogen to the storage tank according to the alarm signal, ensuring a continuous supply of liquid nitrogen to the delivery pipeline.

[0024] Preferably, the liquid nitrogen supply system further includes a cooling device and a controller. The delivery pipeline includes a pipe body, a vacuum layer, and a second temperature detection element. The cooling device and the vacuum layer are both located on the outer peripheral wall of the pipe body, and the second temperature detection element is located inside the pipe body. The vacuum layer is used to block heat conducted from the external environment to the pipe body. The second temperature detection element is used to detect the temperature of the pipe body. The second temperature detection element and the cooling device are both communicatively connected to the controller. The controller is used to control the cooling device to start or stop working based on the detection signal from the second temperature detection element.

[0025] By adopting the above technical solution, a vacuum layer is set on the outer peripheral wall of the pipe. This vacuum layer can block heat conducted from the external environment to the pipe, thereby preventing the liquid nitrogen inside the pipe from vaporizing into nitrogen gas due to excessively high temperatures. This reduces the amount of liquid nitrogen lost during the liquid nitrogen transport process. Furthermore, by installing a cooling device on the outer peripheral wall of the pipe and a second temperature detection device inside the pipe, when the temperature inside the pipe exceeds a preset temperature, the second temperature detection device is triggered and sends a detection signal to the controller. The controller then controls the cooling device to start working based on the detection signal from the second temperature detection device, thereby reducing the temperature inside the pipe and maintaining it within the preset temperature range. This reduces the amount of liquid nitrogen vaporized into nitrogen gas, thus improving the operational reliability of the liquid nitrogen supply system.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By connecting or disconnecting the gas-liquid separator and the delivery pipeline through a first control valve, the gas-liquid separator separates liquid nitrogen and nitrogen gas in the delivery pipeline, and the nitrogen gas is stored in a gas storage tank. The pressure in the delivery pipeline decreases to reduce the delivery speed of liquid nitrogen in the delivery pipeline, thereby reducing the liquid nitrogen delivery volume of the liquid nitrogen supply system. By connecting or disconnecting the gas-liquid separator and the delivery pipeline through a second control valve, the nitrogen gas in the gas storage tank flows into the delivery pipeline, and the pressure in the delivery pipeline increases to increase the delivery speed of liquid nitrogen in the delivery pipeline, thereby increasing the liquid nitrogen delivery volume of the liquid nitrogen supply system. Compared with the prior art, the liquid nitrogen supply system can adjust the liquid nitrogen delivery volume according to the liquid nitrogen usage of the liquid nitrogen-using equipment, thereby improving the user experience of the liquid nitrogen supply system.

[0028] 2. By installing a gas-liquid separator in each delivery pipeline, when it is necessary to reduce the delivery speed of liquid nitrogen in the delivery pipeline, the gas-liquid separator separates the nitrogen in the corresponding delivery pipeline. The separated nitrogen is stored in a gas storage tank. The gas storage tank and one or more of the multiple delivery pipelines are connected or disconnected through a second control valve. The gas storage tank can deliver nitrogen to one or more of the multiple delivery pipelines. The liquid nitrogen supply system can use the nitrogen separated from the delivery pipeline to increase the delivery speed of liquid nitrogen in the corresponding delivery pipeline, thereby achieving the technical effect of dynamically adjusting the delivery speed of liquid nitrogen in multiple delivery pipelines.

[0029] 3. When the storage tank supplies nitrogen to the delivery pipeline and the pressure in the delivery pipeline exceeds the preset pressure range, the pressure detection device is triggered and sends a detection signal to the controller. The controller controls the first throttle valve to reduce the flow rate of nitrogen based on the detection signal from the pressure detection device. This can prevent the delivery pipeline from cracking due to excessive pressure and causing liquid nitrogen leakage, and can also prevent the delivery pipeline from bursting, thereby improving the safety of the liquid nitrogen supply system. Attached Figure Description

[0030] Figure 1 is a schematic diagram of a liquid nitrogen supply system according to an embodiment of this application;

[0031] Figure 2 is a cross-sectional view of the liquid storage tank according to an embodiment of this application;

[0032] Figure 3 is a cross-sectional view of the conveying pipeline according to an embodiment of this application;

[0033] Figure 4 is a cross-sectional view of the conveying pipeline according to an embodiment of this application from another angle.

[0034] Explanation of reference numerals in the attached drawings: 100, Liquid nitrogen supply system; 1, Storage tank; 11, Tank body; 111, First temperature sensor; 112, Liquid level sensor; 12, Insulation layer; 13, Reflective layer; 14, Protective layer; 2, Delivery pipeline; 21, Inlet end; 22, Outlet end; 23, Pipe body; 24, Vacuum layer; 25, Second temperature sensor; 3, Speed ​​regulating mechanism; 31, Gas-liquid separator; 311, First liquid inlet; 312, First liquid outlet; 313, First gas outlet; 32, Gas storage tank; 321, First gas inlet; 322, Second gas outlet; 33, First control valve; 331, Third liquid inlet; 332, Third liquid outlet; 333, Fourth liquid outlet; 34, Second control valve; 341, Second gas inlet; 342, Third gas outlet; 4. Third control valve; 41. Second inlet; 42. Second outlet; 5. Flow meter; 6. First throttle valve; 7. Pressure sensor; 8. Second throttle valve; 9. Leakage detector; 10. Cooling device. Detailed Implementation

[0035] The present application will be further described in detail below with reference to Figures 1-4.

[0036] This application discloses a liquid nitrogen supply system 100.

[0037] Referring to Figure 1, the liquid nitrogen supply system 100 according to an embodiment of this application includes: a storage tank 1, a delivery pipeline 2, and a speed regulating mechanism 3. The storage tank 1 is used to store liquid nitrogen. Along the liquid nitrogen delivery direction of the delivery pipeline 2, the delivery pipeline 2 has an inlet end 21 and an outlet end 22. The inlet end 21 of the delivery pipeline 2 is connected to the storage tank 1, and the outlet end 22 of the delivery pipeline 2 is connected to the liquid nitrogen using equipment. The delivery pipeline 2 is used to deliver liquid nitrogen. In the embodiment shown in Figure 1, the liquid nitrogen delivery direction of the delivery pipeline 2 can refer to the left-to-right direction in Figure 1. That is, the left end of the delivery pipeline 2 is the inlet end 21, the right end of the delivery pipeline 2 is the outlet end 22, and the storage tank 1 is located on the left side of the delivery pipeline 2.

[0038] The speed regulating mechanism 3 includes a gas-liquid separator 31, a gas storage tank 32, a first control valve 33, and a second control valve 34. The first liquid inlet 311 of the gas-liquid separator 31 is connected to the side of the conveying pipe 2 near the inlet 21, and the first liquid outlet 312 of the gas-liquid separator 31 is connected to the side of the conveying pipe 2 near the outlet 22. That is, the connection between the first liquid inlet 311 and the conveying pipe 2 is located on the side of the connection between the first liquid outlet 312 and the conveying pipe 2 near the inlet 21. The first air outlet 313 of the gas-liquid separator 31 is connected to the first air inlet 321 of the gas storage tank 32. A control valve 33 is installed in the delivery pipeline 2 and connected to the gas-liquid separator 31 to control the flow direction of liquid nitrogen in the delivery pipeline 2. Specifically, heat exchange between the liquid nitrogen in the delivery pipeline 2 and the external environment causes some of the liquid nitrogen in the delivery pipeline 2 to evaporate into nitrogen gas. When the first control valve 33 connects the delivery pipeline 2 and the first liquid inlet 311, both the liquid nitrogen and nitrogen gas in the delivery pipeline 2 flow into the gas-liquid separator 31. The gas-liquid separator 31 separates the liquid nitrogen and nitrogen gas. The liquid nitrogen flows back into the delivery pipeline 2 from the first liquid outlet 312, and the nitrogen gas flows into the storage tank 1 from the first gas outlet 313. When the first control valve 33 blocks the delivery pipeline 2 and the first liquid inlet 311, the liquid nitrogen and nitrogen gas in the delivery pipeline 2 flow directly into the liquid nitrogen using equipment along the delivery pipeline 2.

[0039] Specifically, the first control valve 33 is provided with a third inlet end 331, a third outlet end 332, and a fourth outlet end 333. The third inlet end 331 is connected to the side of the infusion pipeline near the inlet end 21, the third outlet end 332 is connected to the first inlet end 311, and the fourth outlet end 333 is connected to the side of the infusion pipeline near the outlet end 22. The first control valve 33 is used to connect or disconnect the third inlet end 331 and the third outlet end 332, and to connect or disconnect the third inlet end 331 and the fourth outlet end 333. When the first control valve 33 connects the third inlet end 331 and the third outlet end 332, the third inlet end 331 and the fourth outlet end 333 are connected. When 332, the first control valve 33 blocks the third inlet end 331 and the fourth outlet end 333. When the first control valve 33 blocks the third inlet end 331 and the third outlet end 332, the first control valve 33 connects the third inlet end 331 and the fourth outlet end 333. The first control valve 33 connects the third inlet end 331 and the third outlet end 332 to connect the first control valve 33 to the conveying pipeline 2 and the gas-liquid separator 31. The first control valve 33 blocks the third inlet end 331 and the third outlet end 332 to block the conveying pipeline 2 and the gas-liquid separator 31.

[0040] The second outlet 322 of the gas storage tank 32 is connected to the delivery pipe 2, and the connection between the second outlet 322 and the delivery pipe 2 is located on the side of the connection between the first liquid inlet 311 and the delivery pipe 2 near the inlet end 21. That is, the connection between the second outlet 322 and the delivery pipe 2 is located to the left of the connection between the first liquid inlet 311 and the delivery pipe 2. The second control valve 34 is connected between the second outlet 322 and the delivery pipe 2. The second control valve 34 is used to connect or block the second outlet 322 and the delivery pipe 2. The gas storage tank 32 is used to store nitrogen and to deliver nitrogen to the delivery pipe 2.

[0041] Specifically, when the second control valve 34 connects the second outlet 322 and the delivery pipe 2, the nitrogen in the storage tank 32 flows into the delivery pipe 2. When the second control valve 34 blocks the second outlet 322 and the delivery pipe 2, the nitrogen in the storage tank 32 stops flowing into the delivery pipe 2.

[0042] Furthermore, when the first control valve 33 connects the delivery pipeline 2 and the gas-liquid separator 31, the second control valve 34 blocks the second outlet 322 and the delivery pipeline 2, so that the nitrogen in the delivery pipeline 2 is stored in the gas storage tank 32. When the first control valve 33 blocks the delivery pipeline 2 and the gas-liquid separator 31, the second control valve 34 can connect or block the second outlet 322 and the delivery pipeline 2.

[0043] Specifically, when the amount of liquid nitrogen used by the liquid nitrogen-using equipment increases, the first control valve 33 blocks the delivery pipeline 2 and the gas-liquid separator 31, and the second control valve 34 connects the gas storage tank 32 and the delivery pipeline 2. The nitrogen in the gas storage tank 32 flows into the delivery pipeline 2 to increase the pressure in the delivery pipeline 2. By increasing the pressure in the delivery pipeline 2, the delivery speed of liquid nitrogen in the delivery pipeline 2 can be increased, thereby increasing the liquid nitrogen delivery volume of the liquid nitrogen supply system 100.

[0044] When the amount of liquid nitrogen used by the liquid nitrogen device decreases, the first control valve 33 connects the delivery pipeline 2 and the gas-liquid separator 31, and the second control valve 34 blocks the gas storage tank 32 and the delivery pipeline 2. The nitrogen in the delivery pipeline 2 flows into the gas storage tank 32 to reduce the pressure in the delivery pipeline 2. By reducing the pressure in the delivery pipeline 2, the delivery speed of liquid nitrogen in the delivery pipeline 2 can be reduced, thereby reducing the amount of liquid nitrogen delivered by the liquid nitrogen supply system 100.

[0045] In some specific embodiments, nitrogen may be pre-stored in the gas storage tank 32, and a pressure source is provided in the gas storage tank 32 to apply pressure to the nitrogen in the gas storage tank 32 so that the nitrogen flows into the delivery pipeline 2.

[0046] In some specific embodiments, the first control valve 33 and the second control valve 34 can both be gate valves, but this application is not limited to this, and the first control valve 33 and the second control valve 34 can also be ball valves, etc.

[0047] Therefore, by connecting or disconnecting the gas-liquid separator 31 and the delivery pipeline 2 through the first control valve 33, the gas-liquid separator 31 separates liquid nitrogen and nitrogen gas in the delivery pipeline 2, and the nitrogen gas is stored in the gas storage tank 32. The pressure in the delivery pipeline 2 decreases to reduce the delivery speed of liquid nitrogen in the delivery pipeline 2, thereby reducing the liquid nitrogen delivery volume of the liquid nitrogen supply system 100. By connecting or disconnecting the gas-liquid separator 31 and the delivery pipeline 2 through the second control valve 34, the nitrogen gas in the gas storage tank 32 flows into the delivery pipeline 2, and the pressure in the delivery pipeline 2 increases to increase the delivery speed of liquid nitrogen in the delivery pipeline 2, thereby increasing the liquid nitrogen delivery volume of the liquid nitrogen supply system 100. Compared with the prior art, the liquid nitrogen supply system 100 can adjust the liquid nitrogen delivery volume according to the liquid nitrogen usage of the liquid nitrogen user equipment, thereby improving the user experience of the liquid nitrogen supply system 100.

[0048] Referring to FIG1, in some embodiments of this application, there are multiple delivery pipes 2, which are spaced apart. In the embodiment shown in FIG1, the multiple delivery pipes 2 are spaced apart along the first direction of the liquid nitrogen supply system 100, which can refer to the up and down direction in FIG1.

[0049] Each conveying pipe 2 is connected to a gas-liquid separator 31 and a first control valve 33. The first outlet 313 of the multiple gas-liquid separators 31 is connected to the first inlet 321. Specifically, the first control valve 33 of each conveying pipe 2 can connect the conveying pipe 2 and the corresponding gas-liquid separator 31. The gas-liquid separator 31 separates the liquid nitrogen and nitrogen gas in the corresponding conveying pipe 2. The nitrogen gas in the multiple conveying pipes 2 is stored in the gas storage tank 32.

[0050] Furthermore, the second control valve 34 is provided with a second air inlet 341 and a plurality of third air outlets 342. The second air inlet 341 is connected to the second air outlet 322, and the plurality of third air outlets 342 are corresponding to and connected to a plurality of conveying pipes 2. The second control valve 34 is used to connect or block one or more of the second air inlet 341 and the plurality of third air outlets 342.

[0051] In the embodiment shown in Figure 1, there are three delivery pipes 2, arranged from top to bottom along the first direction of the liquid nitrogen supply system 100. The three delivery pipes 2 are the first delivery pipe 2, the second delivery pipe 2, and the third delivery pipe 2. There are also three third outlets 342, which are spaced apart along the second direction of the liquid nitrogen supply system 100. The third outlet 342 on the right side of the three third outlets 342 is connected to the first delivery pipe 2, the third outlet 342 in the middle of the three third outlets 342 is connected to the second delivery pipe 2, and the third outlet 342 on the left side of the three third outlets 342 is connected to the third delivery pipe 2. The second direction of the liquid nitrogen supply system 100 can be the left-right direction shown in Figure 1.

[0052] When the amount of liquid nitrogen used by the liquid nitrogen-using equipment connected to the first delivery pipeline 2 increases, the second control valve 34 connects the second inlet 341 with the third outlet 342 on the right among the three third outlets 342, and blocks the second outlet 322 and the remaining third outlets 342. The gas storage tank 32 delivers nitrogen to the first delivery pipeline 2, thereby increasing the delivery speed of liquid nitrogen in the first delivery pipeline 2.

[0053] When the amount of liquid nitrogen used by the liquid nitrogen user connected to the first delivery pipe increases, and the amount of liquid nitrogen used by the liquid nitrogen user connected to the second delivery pipe increases, the second control valve 34 connects the second inlet end 341 to the third outlet end 342 on the right side of the three third outlet ends 342, and connects the second inlet end 341 to the third outlet end 342 in the middle of the three third outlet ends 342, and blocks the second outlet end 322 and the remaining third outlet ends 342. The gas storage tank 32 delivers nitrogen to both the first delivery pipe 2 and the second delivery pipe 2, thereby increasing the delivery speed of liquid nitrogen in the first delivery pipe 2 and the delivery speed of liquid nitrogen in the second delivery pipe 2.

[0054] By connecting or blocking one or more of the second air inlet 341 and the plurality of third air outlets 342 through the second control valve 34, the gas storage tank 32 can supply nitrogen to one or more of the plurality of delivery pipes 2, thereby increasing the delivery speed of liquid nitrogen in the corresponding delivery pipe 2. Compared with setting a second control valve 34 in each delivery pipe 2, this arrangement can reduce the manufacturing cost of the liquid nitrogen supply system 100.

[0055] Furthermore, by installing a gas-liquid separator 31 in each conveying pipe 2, when it is necessary to reduce the conveying speed of liquid nitrogen in the conveying pipe 2, the gas-liquid separator 31 separates the nitrogen in the corresponding conveying pipe 2. The separated nitrogen is stored in the gas storage tank 32. The gas storage tank 32 is connected or disconnected from one or more of the multiple conveying pipes 2 through the second control valve 34. The gas storage tank 32 can convey nitrogen to one or more of the multiple conveying pipes 2. The liquid nitrogen supply system 100 can use the nitrogen separated from the conveying pipe 2 to increase the conveying speed of liquid nitrogen in the corresponding conveying pipe 2, thereby achieving the technical effect of dynamically adjusting the conveying speed of liquid nitrogen in multiple conveying pipes 2 by the liquid nitrogen supply system 100.

[0056] Referring to FIG1, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: a third control valve 4, the third control valve 4 being connected between the storage tank 1 and a plurality of delivery pipes 2, the third control valve 4 being provided with a second inlet end 41 and a plurality of second outlet ends 42, the second inlet end 41 being connected to the storage tank 1, and the plurality of second outlet ends 42 being corresponding to and connected to the plurality of delivery pipes 2, the third control valve 4 being used to connect or block one or more of the second inlet end 41 and the plurality of second outlet ends 42.

[0057] In the embodiment shown in Figure 1, there are three second liquid outlets 42, which are arranged sequentially along the first direction of the liquid nitrogen supply system 100. The upper second liquid outlet 42 is connected to the first conveying pipe 2, the middle second liquid outlet 42 is connected to the second conveying pipe 2, and the lower second liquid outlet 42 is connected to the third conveying pipe 2.

[0058] When a liquid nitrogen user connected to a delivery pipe 2 stops using liquid nitrogen, the third control valve 4 blocks the second inlet 41 and the corresponding second outlet 42, as well as the connection between the second inlet 41 and the remaining second outlet 42. The storage tank 1 then delivers liquid nitrogen to the delivery pipe 2 connected to the storage tank 1. This prevents the storage tank 1 from continuously delivering liquid nitrogen to the delivery pipe 2 connected to the liquid nitrogen user that has stopped using liquid nitrogen. It also prevents the output liquid nitrogen of the storage tank 1 from being distributed, which would cause the liquid nitrogen delivery volume in the delivery pipe 2 connected to the storage tank 1 to fail to reach the preset liquid nitrogen delivery volume. This improves the operational reliability of the liquid nitrogen supply system 100.

[0059] Referring to Figure 1, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: a flow meter 5 and a controller. The flow meter 5 is disposed in the delivery pipe 2 and is used to detect the flow rate of liquid nitrogen in the delivery pipe 2. The controller is communicatively connected to the first control valve 33, the second control valve 34 and the flow meter 5. The controller is used to receive a flow rate adjustment signal, compare the flow rate adjustment signal with the detection signal of the flow meter 5 and generate a control signal. The controller is also used to control the working state of the first control valve 33 and the working state of the second control valve 34 according to the control signal.

[0060] Specifically, when the liquid nitrogen usage of the liquid nitrogen-using equipment increases or decreases, the operator sends a flow rate adjustment signal to the controller based on the changed liquid nitrogen usage. The controller compares the flow rate adjustment signal with the detection signal of the flow meter 5 and generates a control signal.

[0061] When the liquid nitrogen usage of the liquid nitrogen-using equipment increases, and the liquid nitrogen delivery volume of the delivery pipeline 2 is lower than the liquid nitrogen usage of the liquid nitrogen-using equipment, the controller generates a first control signal. Based on the first control signal, the controller controls the first control valve 33 to block the delivery pipeline 2 and the gas-liquid separator 31, and controls the second control valve 34 to connect the delivery pipeline 2 and the gas storage tank 32. The gas storage tank 32 delivers nitrogen to the delivery pipeline 2 to increase the pressure inside the delivery pipeline 2, thereby increasing the liquid nitrogen delivery volume of the delivery pipeline 2.

[0062] When the amount of liquid nitrogen used by the liquid nitrogen user decreases, and the amount of liquid nitrogen delivered by the delivery pipeline 2 is higher than the amount of liquid nitrogen used by the liquid nitrogen user, the controller generates a second control signal. The controller controls the first control valve 33 to connect the delivery pipeline 2 and the gas-liquid separator 31, and controls the second control valve 34 to block the delivery pipeline 2 and the gas storage tank 32. The gas-liquid separator 31 separates the nitrogen in the delivery pipeline 2 to reduce the pressure in the delivery pipeline 2, thereby reducing the amount of liquid nitrogen delivered in the delivery pipeline 2.

[0063] It should be noted that the controller can calculate the liquid nitrogen delivery volume of the delivery pipeline 2 based on the detection signal of the flow meter 5.

[0064] The flow rate of liquid nitrogen in the delivery pipeline 2 is detected by the flow meter 5. When the liquid nitrogen usage of the liquid nitrogen user changes, the operator sends a flow rate adjustment signal to the controller. The controller compares the flow rate adjustment signal with the detection signal of the flow meter 5 to determine the difference between the liquid nitrogen delivery volume of the delivery pipeline 2 and the change in liquid nitrogen usage of the liquid nitrogen user and generates a control signal. The controller controls the first control valve 33 to connect or disconnect the delivery pipeline 2 and the gas-liquid separator 31, and controls the second control valve 34 to connect or disconnect the gas storage tank 32 of the delivery pipeline 2, thereby adjusting the liquid nitrogen delivery volume of the delivery pipeline 2. This achieves the technical effect of the liquid nitrogen supply system 100 adjusting the liquid nitrogen delivery volume of the delivery pipeline 2 according to the change in liquid nitrogen usage of the liquid nitrogen user.

[0065] Referring to Figure 1, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: a first throttle valve 6 and a pressure detection element 7. The first throttle valve 6 is connected between the second control valve 34 and the delivery pipeline 2. The first throttle valve 6 is used to control the flow rate of nitrogen delivered from the gas storage tank 32 to the delivery pipeline 2. The pressure detection element 7 is disposed in the delivery pipeline 2 and is used to detect the pressure in the delivery pipeline 2. Both the first throttle valve 6 and the pressure detection element 7 are communicatively connected to a controller. The controller is also used to control the first throttle valve 6 to adjust the flow rate of nitrogen according to the detection signal of the pressure detection element 7.

[0066] Specifically, the delivery pipeline 2 can withstand pressure within a preset pressure range. When the storage tank 1 delivers nitrogen to the delivery pipeline 2 and the pressure in the delivery pipeline 2 exceeds the preset pressure range, the pressure detection element 7 is triggered and sends a detection signal to the controller. The controller controls the first throttle valve 6 to reduce the flow rate of nitrogen based on the detection signal from the pressure detection element 7. This can prevent the delivery pipeline 2 from cracking due to excessive pressure, thus preventing liquid nitrogen leakage, and can also prevent the delivery pipeline 2 from bursting, thereby improving the safety of the liquid nitrogen supply system 100.

[0067] Furthermore, when the pressure in the delivery pipeline 2 is lower than the preset pressure range, the pressure detection element 7 is triggered and sends a detection signal to the controller. The controller controls the first throttle valve 6 to increase the flow rate of nitrogen based on the detection signal from the pressure detection element 7, so that the liquid nitrogen delivery volume of the delivery pipeline 2 is equal to the preset liquid nitrogen delivery volume.

[0068] Referring to Figure 1, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: a second throttle valve 8, which is disposed in the delivery pipe 2 and is used to control the flow rate of liquid nitrogen in the delivery pipe 2.

[0069] Specifically, the operator can adjust the second throttle valve 8 according to the amount of liquid nitrogen used by the liquid nitrogen user equipment. When the amount of liquid nitrogen used by the liquid nitrogen user equipment is large, the operator controls the second throttle valve 8 to increase the flow rate of liquid nitrogen in the delivery pipeline 2. When the amount of liquid nitrogen used by the liquid nitrogen user equipment is small, the operator controls the second throttle valve 8 to decrease the flow rate of liquid nitrogen in the delivery pipeline 2. In this way, the liquid nitrogen supply system 100 can achieve the technical effect of adjusting the liquid nitrogen delivery volume according to the amount of liquid nitrogen used by the liquid nitrogen user equipment.

[0070] Referring to FIG4, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: a leak detection element 9, which is disposed in the delivery pipeline 2 and is used to detect whether liquid nitrogen is leaking in the delivery pipeline 2 and to generate a leak signal.

[0071] Specifically, the leak detection element 9 can be a pressure detection element 7 and / or a sound detection element and / or a gas detection element. When the leak detection element 9 is a pressure detection element 7, it determines whether liquid nitrogen is leaking in the delivery pipeline 2 by detecting the pressure value inside the pipeline 2. Specifically, when the pressure value inside the delivery pipeline 2 is lower than a preset pressure value, the leak detection element 9 is triggered and generates a leak signal. The operator controls the third control valve 4 to block the storage tank 1 and the delivery pipeline 2 where the liquid nitrogen leak has occurred, based on the leak signal. It should be noted that when the leak detection element 9 is a pressure detection element 7, it is installed inside the delivery pipeline 2.

[0072] When the leak detection element 9 is a sound detection element, when liquid nitrogen leaks in the delivery pipeline 2, liquid nitrogen flows from the delivery pipeline 2 into the external environment and quickly vaporizes into nitrogen gas and generates noise. The leak detection element 9 determines whether liquid nitrogen is leaking in the delivery pipeline 2 by detecting the noise generated when liquid nitrogen leaks. Specifically, when there is noise in the delivery pipeline 2 that is higher than the preset decibel value, the leak detection element 9 is triggered and generates a leak signal. The operator controls the third control valve 4 to block the storage tank 1 and the delivery pipeline 2 where liquid nitrogen is leaking according to the leak signal.

[0073] When the leak detection element 9 is a gas detection element, the leak detection element 9 determines whether liquid nitrogen is leaking in the delivery pipeline 2 by detecting the nitrogen concentration at the interface between the delivery pipeline 2 and the external environment. Specifically, when the nitrogen concentration at the interface between the delivery pipeline 2 and the external environment is higher than the preset concentration value, the leak detection element 9 is triggered and generates a leak signal. The operator controls the third control valve 4 to block the storage tank 1 and the delivery pipeline 2 where liquid nitrogen is leaking according to the leak signal.

[0074] In some specific embodiments, the delivery pipeline 2 may be equipped with a pressure detection element 7, a sound detection element, and a gas detection element to detect whether liquid nitrogen is leaking inside the delivery pipeline 2.

[0075] The leakage detection device 9 detects whether liquid nitrogen is leaking in the delivery pipeline 2. When liquid nitrogen leaks in the delivery pipeline 2, the leakage detection device 9 is triggered and generates a leakage signal. The operator controls the third control valve 4 to block the storage tank 1 and the delivery pipeline 2 where liquid nitrogen is leaking, thereby reducing the amount of liquid nitrogen leakage and improving the working reliability of the liquid nitrogen supply system 100.

[0076] Referring to Figure 2, in some embodiments of this application, the storage tank 1 includes a tank body 11, a heat insulation layer 12, a reflective layer 13, and a protective layer 14. The tank body 11 is used to store liquid nitrogen and is connected to a third control valve 4. The tank body 11 supplies liquid nitrogen to the delivery pipeline 2. The heat insulation layer 12 is disposed on the outer peripheral wall of the tank body 11, the reflective layer 13 is disposed on the outer peripheral wall of the heat insulation layer 12, and the protective layer 14 is disposed on the outer peripheral wall of the heat insulation layer 12. The heat insulation layer 12 is used to block the heat conducted from the external environment to the tank body 11, and the reflective layer 13 is used to reflect the heat from the external environment.

[0077] By providing a heat insulation layer 12, a reflective layer 13, and a protective layer 14 on the outer periphery of the tank 11, the heat insulation layer 12 can block the heat conducted from the external environment to the tank 11, and the reflective layer 13 can reflect the heat conducted from the external environment to the tank 11, so that the temperature inside the tank 11 is maintained within a preset temperature range. This can prevent the temperature inside the tank 11 from becoming too high, causing liquid nitrogen to vaporize into nitrogen gas, thereby reducing the amount of liquid nitrogen lost. Furthermore, by providing a protective layer 14 to protect the tank 11, the heat insulation layer 12, and the reflective layer 13, wear on the tank 11, the heat insulation layer 12, and the reflective layer 13 can be reduced, thereby improving the service life of the liquid storage tank 1.

[0078] In some specific embodiments, the heat insulation layer 12 can be aerogel, the reflective layer 13 can be aluminum foil, and the protective layer 14 can be stainless steel. However, this application is not limited to these. The heat insulation layer 12 can also be polyurethane foam, the reflective layer 13 can also be silver-plated film, and the protective layer 14 can also be glass fiber reinforced plastic.

[0079] Referring to Figure 2, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: an alarm device and a controller. A first temperature detector 111 and a liquid level detector 112 are provided inside the tank 11. The first temperature detector 111 is used to detect the temperature inside the tank 11, and the liquid level detector 112 is used to detect the liquid nitrogen level in the tank 11. The first temperature detector 111, the liquid level detector 112 and the alarm device are all communicatively connected to the controller. The controller is used to trigger an alarm based on the detection signal from the first temperature detector 111 and / or the detection signal from the liquid level detector 112.

[0080] Specifically, when the temperature inside the liquid storage tank 1 is higher than the preset temperature, the first temperature detection element 111 is triggered and sends a detection signal to the controller. The controller controls the alarm device to sound an alarm based on the detection signal from the first temperature detection element 111. The operator adjusts the temperature inside the liquid storage tank 1 according to the signal from the alarm device, thereby preventing the liquid nitrogen from vaporizing into nitrogen gas due to excessively high temperature inside the liquid storage tank 1, reducing the amount of liquid nitrogen lost, and thus improving the working reliability of the liquid nitrogen supply system 100.

[0081] Furthermore, when the liquid nitrogen level in the storage tank 1 is lower than the preset liquid level, the liquid level detection device 112 is triggered and sends a detection signal to the controller. The controller controls the alarm device to sound an alarm based on the detection signal from the liquid level detection device 112. The operator adds liquid nitrogen to the storage tank 1 according to the alarm device signal so that the storage tank 1 can continuously supply liquid nitrogen to the delivery pipeline 2.

[0082] In some specific embodiments, the first temperature detection element 111 can be a thermocouple and the liquid level detection element 112 can be an ultrasonic liquid level sensor. However, this application is not limited to this. The first temperature detection element 111 can also be an infrared temperature sensor, etc., and the liquid level detection element 112 can also be a capacitive liquid level sensor, etc.

[0083] Furthermore, the alarm device can issue a first alarm signal and a second alarm signal. The controller controls the alarm device to issue the first alarm signal based on the detection signal of the first temperature detection element 111, and the controller controls the alarm device to issue the second alarm signal based on the detection signal of the liquid level detection element 112. The operator can identify the type of problem that has occurred in the liquid storage tank 1 by using the first alarm signal and the second alarm signal.

[0084] Referring to Figures 3 and 4, in some embodiments of this application, the liquid nitrogen supply system 100 may further include: a cooling device 10 and a controller; the delivery pipe 2 includes a pipe body 23, a vacuum layer 24, and a second temperature detection element 25; the pipe body 23 is connected to a third control valve 4; the pipe body 23 is used to deliver liquid nitrogen; the cooling device 10 and the vacuum layer 24 are both disposed on the outer peripheral wall of the pipe body 23; the second temperature detection element 25 is disposed inside the pipe body 23; the vacuum layer 24 is used to block heat conducted from the external environment to the pipe body 23; the second temperature detection element 25 is used to detect the temperature of the pipe body 23; the second temperature detection element 25 and the cooling device 10 are both communicatively connected to the controller; the controller is used to control the cooling device 10 to start or stop working according to the detection signal of the second temperature detection element 25.

[0085] By providing a vacuum layer 24 on the outer periphery of the tube 23, the vacuum layer 24 can block heat conducted from the external environment to the tube 23, thereby preventing the liquid nitrogen inside the tube 23 from vaporizing into nitrogen gas due to excessively high temperatures, thus reducing the amount of liquid nitrogen lost during the liquid nitrogen supply process. Furthermore, by providing a cooling device 10 on the outer periphery of the tube 23 and a second temperature detection element 25 inside the tube 23, when the temperature inside the tube 23 exceeds a preset temperature, the second temperature detection element 25 is triggered and sends a detection signal to the controller. The controller controls the cooling device 10 to start working based on the detection signal from the second temperature detection element 25, thereby reducing the amount of liquid nitrogen vaporized into nitrogen gas and improving the operational reliability of the liquid nitrogen supply system 100.

[0086] When the temperature inside the tube 23 is lower than the preset temperature, the second temperature detection element 25 is triggered and sends a detection signal to the controller. The controller controls the cooling device 10 to stop working based on the detection signal from the second temperature detection element 25.

[0087] It should be noted that the outer peripheral wall of the tube 23 is not completely covered by the vacuum layer 24, and there is an exposed area on the outer peripheral wall of the tube 23. The cooling device 10 is located in the exposed area on the outer peripheral wall of the tube 23.

[0088] In some specific embodiments, the second temperature detection element 25 can be a thermocouple, but this application is not limited to this. The second temperature detection element 25 can also be an infrared temperature sensor, etc.

[0089] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A liquid nitrogen supply system, characterized in that, include: A storage tank (1) and a conveying pipe (2) are provided. The storage tank (1) is used to store liquid nitrogen. The conveying pipe (2) has an inlet end (21) and an outlet end (22) along the liquid nitrogen conveying direction of the conveying pipe (2). The inlet end (21) of the conveying pipe (2) is connected to the storage tank (1). The conveying pipe (2) is used to convey liquid nitrogen. Speed ​​regulating mechanism (3), the speed regulating mechanism (3) includes a gas-liquid separator (31), a gas storage tank (32), a first control valve (33) and a second control valve (34). The first liquid inlet (311) of the gas-liquid separator (31) is connected to the side of the conveying pipe (2) near the inlet end (21). The first liquid outlet (312) of the gas-liquid separator (31) is connected to the side of the conveying pipe (2) near the outlet end (22). The first gas outlet (313) of the gas-liquid separator (31) is connected to the first gas inlet (321) of the gas storage tank (32). The first control valve (33) is located in the conveying pipe (2) and connected to the gas-liquid separator (31). The first control valve (33) is used to connect... The first liquid inlet (311) and the delivery pipe (2) are connected or blocked to control the flow direction of liquid nitrogen in the delivery pipe (2). The second outlet (322) of the gas storage tank (32) is connected to the delivery pipe (2), and the connection between the second outlet (322) and the delivery pipe (2) is located on the side of the connection between the first liquid inlet (311) and the delivery pipe (2) near the inlet (21). The second control valve (34) is connected between the second outlet (322) and the delivery pipe (2). The second control valve (34) is used to connect or block the second outlet (322) and the delivery pipe (2). The gas storage tank (32) is used to store nitrogen and deliver nitrogen to the delivery pipe (2).

2. The liquid nitrogen supply system according to claim 1, characterized in that, There are multiple conveying pipes (2), which are spaced apart. Each conveying pipe (2) is connected to the gas-liquid separator (31) and the first control valve (33). The first outlet (313) of the multiple gas-liquid separators (31) is connected to the first inlet (321). The second control valve (34) is provided with a second inlet (341) and multiple third outlets (342). The second inlet (341) is connected to the second outlet (322). The multiple third outlets (342) correspond one-to-one with the multiple conveying pipes (2) and are connected. The second control valve (34) is used to connect or block one or more of the second inlet (341) and the multiple third outlets (342).

3. A liquid nitrogen supply system according to claim 2, characterized in that, Also includes: The third control valve (4) is connected between the liquid storage tank (1) and the plurality of conveying pipes (2). The third control valve (4) is provided with a second inlet end (41) and a plurality of second outlet ends (42). The second inlet end (41) is connected to the liquid storage tank (1), and the plurality of second outlet ends (42) are corresponding to and connected to the plurality of conveying pipes (2). The third control valve (4) is used to connect or block one or more of the second inlet end (41) and the plurality of second outlet ends (42).

4. A liquid nitrogen supply system according to claim 1, characterized in that, Also includes: A flow meter (5) and a controller are provided. The flow meter (5) is located in the conveying pipe (2) and is used to detect the flow rate of liquid nitrogen in the conveying pipe (2). The controller is communicatively connected to the first control valve (33), the second control valve (34) and the flow meter (5). The controller is used to receive the flow rate adjustment signal, compare the flow rate adjustment signal with the detection signal of the flow meter (5) and generate a control signal. The controller is also used to control the working state of the first control valve (33) and the working state of the second control valve (34) according to the control signal.

5. A liquid nitrogen supply system according to claim 4, characterized in that, Also includes: The first throttle valve (6) and the pressure sensor (7) are connected between the second control valve (34) and the delivery pipeline (2). The pressure sensor (7) is located inside the delivery pipeline (2) and is used to detect the pressure inside the delivery pipeline (2). Both the first throttle valve (6) and the pressure sensor (7) are communicatively connected to the controller. The controller is also used to control the first throttle valve (6) to adjust the flow rate of nitrogen according to the detection signal of the pressure sensor (7).

6. A liquid nitrogen supply system according to claim 1, characterized in that, Also includes: The second throttle valve (8) is located in the conveying pipe (2) and is used to control the flow rate of liquid nitrogen in the conveying pipe (2).

7. A liquid nitrogen supply system according to claim 1, characterized in that, Also includes: Leakage detection device (9) is provided in the conveying pipeline (2) and is used to detect whether liquid nitrogen is leaking in the conveying pipeline (2) and to generate a leakage signal.

8. A liquid nitrogen supply system according to claim 1, characterized in that, The storage tank (1) includes a tank body (11), a heat insulation layer (12), a reflective layer (13), and a protective layer (14). The heat insulation layer (12) is disposed on the outer peripheral wall of the tank body (11), the reflective layer (13) is disposed on the outer peripheral wall of the heat insulation layer (12), and the protective layer (14) is disposed on the outer peripheral wall of the heat insulation layer (12). The heat insulation layer (12) is used to block the heat conducted from the external environment to the tank body (11), and the reflective layer (13) is used to reflect the heat from the external environment.

9. A liquid nitrogen supply system according to claim 8, characterized in that, Also includes: An alarm device and a controller are provided. The tank (11) is equipped with a first temperature detection element (111) and a liquid level detection element (112). The first temperature detection element (111) is used to detect the temperature inside the tank (11), and the liquid level detection element (112) is used to detect the liquid nitrogen level in the tank (11). The first temperature detection element (111), the liquid level detection element (112) and the alarm device are all communicatively connected to the controller. The controller is used to control the alarm device to trigger an alarm based on the detection signal of the first temperature detection element (111) and / or the detection signal of the liquid level detection element (112).

10. A liquid nitrogen supply system according to claim 1, characterized in that, Also includes: The cooling device (10) and controller are provided. The conveying pipe (2) includes a pipe body (23), a vacuum layer (24), and a second temperature detection element (25). The cooling device (10) and the vacuum layer (24) are both located on the outer peripheral wall of the pipe body (23). The second temperature detection element (25) is located inside the pipe body (23). The vacuum layer (24) is used to block the heat conducted from the external environment to the pipe body (23). The second temperature detection element (25) is used to detect the temperature of the pipe body (23). The second temperature detection element (25) and the cooling device (10) are both connected to the controller. The controller is used to control the cooling device (10) to start or stop working according to the detection signal of the second temperature detection element (25).

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