Pressure stabilizing discharge device for a cryogenic vessel and cryogenic vessel

Abstract

The present application provides a kind of steady voltage discharge device, including shell, inlet pipe, separation component, discharge pipe and backflow pipe, wherein, shell is provided with containing cavity, and containing cavity is divided and forms installation cavity and backflow cavity.The one end of inlet pipe is communicated liquid nitrogen cold screen, the other end is communicated installation cavity, to import gas-liquid mixture in liquid nitrogen cold screen to installation cavity, discharge pipe is communicated in the top of installation cavity.Simultaneously, installation cavity is provided with separation component, to be used for separating liquid nitrogen in gas-liquid mixture and stabilizing the gas pressure of gas-liquid mixture, from so that liquid nitrogen in gas-liquid mixture condenses and settles in backflow cavity, and nitrogen gas can be discharged from discharge pipe outside installation cavity.In addition, one end of backflow pipe is communicated liquid nitrogen cold screen, the other end is communicated backflow cavity, so that the liquid nitrogen in backflow cavity can be backflowed to liquid nitrogen cold screen by backflow pipe, to reduce the loss of liquid nitrogen, and reduce heat leakage.

Description

Technical Field

[0001] This invention relates to the field of cryogenic medium container technology, and particularly to a pressure stabilization and discharge device for a cryogenic container and a cryogenic container. Background Technology

[0002] A cryogenic medium mobile container with a vacuum jacket and high-vacuum multilayer insulation material incorporates a liquid nitrogen cooling shield between the inner container and the outer shell to minimize the heat flow of the cryogenic medium flowing into or containing it. The cold source for the liquid nitrogen cooling shield is provided by a liquid nitrogen container inside the vacuum jacket. The liquid nitrogen remains in the pipes of the liquid nitrogen cooling shield, readily and endothermally converting into a gas-liquid mixture of nitrogen gas and liquid nitrogen, which is then discharged from the vacuum piping system.

[0003] However, due to transportation vibrations and other reasons, the internal pressure of the liquid nitrogen system in ultra-low temperature mobile containers may fluctuate, resulting in excessive gas phase load and excessive gas velocity. This increases the mixing and carrying capacity of the gas and liquid, causing some small droplets of liquid nitrogen to be entrained by the nitrogen gas flow and discharged from the vacuum pipeline system with the nitrogen, which will waste cooling capacity and reduce the insulation performance of ultra-liquid nitrogen. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure stabilizing and discharge device that can stabilize the pressure in a vacuum pipeline system and reduce the loss of liquid nitrogen, thereby reducing the waste of cooling capacity.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A pressure-stabilizing and venting device for a cryogenic container, the cryogenic container including a liquid tank for containing liquid nitrogen and a liquid nitrogen cooling screen disposed within the cryogenic container and communicating with the liquid tank; the pressure-stabilizing and venting device is connected to the liquid nitrogen cooling screen for condensing and settling the gas-liquid mixture flowing out of the liquid nitrogen cooling screen, the pressure-stabilizing and venting device including: a shell having an internal receiving cavity; the receiving cavity being divided into a communicating installation cavity and a reflux cavity, the reflux cavity being located at the bottom of the receiving cavity; an inlet pipe; one end of the inlet pipe communicating with the liquid nitrogen cooling screen, and the other end communicating with the installation cavity. The system includes: a gas-liquid mixture for introducing the liquid nitrogen cooling screen into the receiving cavity; a separation component disposed within the mounting cavity for separating liquid nitrogen and nitrogen gas in the gas-liquid mixture and causing the liquid nitrogen to settle, so that the liquid nitrogen can settle from the mounting cavity into the reflux cavity under the action of gravity; a discharge pipe connected to the mounting cavity and located at the top of the mounting cavity for discharging nitrogen gas; and a reflux pipe, one end of which is connected to the liquid nitrogen cooling screen and the other end of which is connected to the bottom of the reflux cavity for returning the liquid nitrogen in the reflux cavity to the liquid nitrogen cooling screen.

[0007] In one embodiment of this application, the separation assembly includes a plurality of demisters and a plurality of partition plates; the plurality of demisters are arranged sequentially in the mounting cavity and located between the inlet pipe and the outlet pipe to enable the gas-liquid mixture to condense and settle in stages; the partition plates are used to allow the gas-liquid mixture to pass through, and the partition plates are installed between adjacent demisters.

[0008] In one embodiment of this application, the demister is a filter screen.

[0009] In one embodiment of this application, the mesh size of the plurality of filter screens increases sequentially from the inlet pipe to the outlet pipe.

[0010] In one embodiment of this application, the partition plate is provided with a plurality of vent holes so that the gas-liquid mixture can penetrate the partition plate.

[0011] In one embodiment of this application, a liquid distribution plate is provided between the mounting cavity and the reflux cavity; the liquid distribution plate has multiple through holes so that the liquid nitrogen can flow from the mounting cavity to the reflux cavity through the through holes.

[0012] In one embodiment of this application, the housing includes an inner liner and an outer shell; the inner liner is installed inside the outer shell, and a vacuum layer is formed between the inner liner and the outer shell; the inner liner has the receiving cavity.

[0013] In one embodiment of this application, a heat insulation element is provided in the vacuum layer.

[0014] In one embodiment of this application, the receiving cavity is cylindrical; the connection between the inlet pipe and the mounting cavity is located on one side of the axial direction of the receiving cavity, and the connection between the outlet pipe and the mounting cavity is located on the other side of the axial direction of the receiving cavity.

[0015] This application also provides a cryogenic container, including an outer shell, a storage tank for storing a cryogenic medium, a liquid tank for loading liquid nitrogen, a liquid nitrogen cooling screen for regulating temperature, and any one of the aforementioned pressure stabilizing and discharge devices; the storage tank, the liquid tank, the liquid nitrogen cooling screen, and the pressure stabilizing and discharge device are all disposed inside the outer shell; the liquid nitrogen cooling screen is installed on the outer wall of the storage tank; the pressure stabilizing and discharge device is connected to the liquid tank through the liquid nitrogen cooling screen and is located above the liquid nitrogen cooling screen.

[0016] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects:

[0017] In this invention, the pressure-stabilizing and discharging device includes a housing, an inlet pipe, a separation component, a discharge pipe, and a return pipe. The housing has a receiving cavity, which is divided into an installation cavity and a return cavity. One end of the inlet pipe is connected to a liquid nitrogen cooling screen, and the other end is connected to the installation cavity, to introduce a gas-liquid mixture from the liquid nitrogen cooling screen into the installation cavity. The discharge pipe is connected to the top of the installation cavity. Simultaneously, a separation component is provided within the installation cavity to separate liquid nitrogen from the gas-liquid mixture and stabilize the gas pressure of the mixture, causing the liquid nitrogen in the gas-liquid mixture to condense and settle into the return cavity, while nitrogen gas can be discharged from the installation cavity through the discharge pipe. Furthermore, one end of the return pipe is connected to the liquid nitrogen cooling screen, and the other end is connected to the return cavity, allowing liquid nitrogen in the return cavity to flow back into the liquid nitrogen cooling screen through the return pipe, thereby reducing liquid nitrogen loss and heat leakage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a cryogenic container according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a pressure-stabilizing emission device according to an embodiment of the present invention.

[0020] The annotations in the attached figures are explained as follows:

[0021] 10-Liquid tank; 11-Liquid nitrogen cooling shield; 12-Pressure stabilizing and discharge device; 20-Shell; 21-Containing cavity; 22-Installation cavity; 23-Return cavity; 24-Inner liner; 25-Outer shell; 26-Insulation component; 30-Inlet pipe; 40-Separation assembly; 41-Demisting component; 42-Divider plate; 43-Distribution plate; 50-Discharge pipe; 60-Return pipe. Detailed Implementation

[0022] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0023] In the description of this invention, it should be understood that, in the embodiments shown in the drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In practical applications, the pressure fluctuations within the liquid nitrogen system of cryogenic mobile containers can occur due to transportation vibrations, leading to excessive gas phase load and high gas velocity. This increases the agitation and carrying capacity of the gas and liquid, causing some small droplets of liquid nitrogen to be entrained by the nitrogen gas flow and discharged from the vacuum piping system, resulting in wasted cooling capacity and reduced insulation performance of the cryogenic medium. Therefore, a cryogenic container is proposed to address these issues.

[0026] The solution is further illustrated by the following examples:

[0027] Please see Figure 1 The cryogenic container of this embodiment is used to store cryogenic media. Specifically, the cryogenic container includes an outer shell, a storage tank, a liquid tank 10, a liquid nitrogen cooling shield 11, and a pressure stabilizing and discharging device 12. The storage tank, liquid tank 10, liquid nitrogen cooling shield 11, and pressure stabilizing and discharging device 12 are all housed within the outer shell. The storage tank is used to store the cryogenic media for storage and transportation. The liquid tank 10 stores liquid nitrogen as a cold source. The liquid nitrogen cooling shield 11 connects to the liquid tank 10 and is attached to the outer wall of the storage tank. By circulating liquid nitrogen within the cooling shield 11, the temperature inside the storage tank is adjusted, ensuring the safe storage of the cryogenic media. Simultaneously, the cooling shield 11 also regulates the temperature of the cryogenic media flowing into or out of the storage tank, thereby reducing the temperature difference between the cryogenic media inside the storage tank and the external temperature of the storage tank, and thus reducing the impact of thermal stress caused by temperature changes on the storage tank. The pressure stabilizing discharge device 12 is used to condense and settle the gas-liquid mixture flowing out of the liquid nitrogen cooling screen 11, so as to separate the liquid nitrogen and nitrogen gas in the gas-liquid mixture.

[0028] In this embodiment, the pressure stabilizing and discharge device 12 is connected to the liquid tank 10 through the liquid nitrogen cooling screen 11, so that the gas-liquid mixture in the liquid tank 10 and the liquid nitrogen cooling screen 11 can be separated by the pressure stabilizing and discharge device 12, and the liquid nitrogen can be returned to the liquid tank 10 and the nitrogen can be discharged to the external environment.

[0029] It should be noted that, in this embodiment, the pressure stabilizing discharge device 12 is installed inside the cryogenic container and located above the liquid nitrogen cooling screen 11, so that the liquid nitrogen separated by the pressure stabilizing discharge device 12 automatically flows back into the liquid nitrogen cooling screen 11 under the action of gravity, thereby reducing the loss of liquid nitrogen and reducing the waste of cooling capacity.

[0030] Please see Figure 2 The pressure-stabilizing discharge device of this embodiment includes a housing 20, an inlet pipe 30, a separation component 40, a discharge pipe 50, and a return pipe 60. The housing 20 has an internal receiving cavity 21. Specifically, in this embodiment, the receiving cavity 21 is divided into a communicating installation cavity 22 and a return cavity 23, with the return cavity 23 located at the bottom of the receiving cavity 21. Meanwhile, one end of the inlet pipe 30 is connected to the liquid nitrogen cooling screen 11, and the other end is connected to the installation cavity 22, allowing the inlet pipe 30 to guide the gas-liquid mixture within the liquid nitrogen cooling screen 11 into the receiving cavity 21. The separation component 40 is disposed within the installation cavity 22 to separate liquid nitrogen and nitrogen gas from the gas-liquid mixture flowing out of the liquid nitrogen cooling screen 11, causing the liquid nitrogen to condense and settle. Under gravity, the liquid nitrogen settles from the installation cavity 22 into the return cavity 23. Furthermore, since one end of the reflux pipe 60 is connected to the liquid nitrogen cooling screen 11 and the other end is connected to the bottom of the reflux chamber 23, the reflux pipe 60 can reflux the liquid nitrogen accumulated in the reflux chamber 23 back into the liquid nitrogen cooling screen 11. In addition, the discharge pipe 50 is connected to the mounting chamber 22 and located at the top of the mounting chamber 22 for discharging the nitrogen gas separated from the gas-liquid mixture to the external environment.

[0031] Therefore, after liquid nitrogen flows from the liquid tank 10 to the liquid nitrogen cooling screen 11, it absorbs heat and heats up, forming a gas-liquid mixture. This mixture then flows through the inlet pipe 30 into the mounting cavity 22. At this point, the gas-liquid mixture encounters the separation component 40 located within the mounting cavity 22, causing the liquid nitrogen in the mixture to condense and settle, thus separating the liquid nitrogen from the nitrogen gas. Because nitrogen gas is relatively light, the nitrogen gas in the mounting cavity 22 flows out along the discharge pipe 50 and is discharged into the external environment. Simultaneously, due to the greater mass of liquid nitrogen, it flows and collects under gravity into the return cavity 23 below the mounting cavity 22, and then flows back to the liquid nitrogen cooling screen 11 through the return pipe 60. This prevents the gas-liquid mixture from carrying liquid nitrogen out of the pressure-stabilizing discharge device 12, thereby reducing the waste of liquid nitrogen and cooling capacity.

[0032] It should be noted that when the internal pressure of the liquid tank 10 fluctuates due to transportation or other reasons, the flow rate and pressure of the gas-liquid mixture flowing out of the liquid tank 10 and the liquid nitrogen cooling screen 11 become excessive, resulting in an excessively high proportion of liquid nitrogen entrained in the gas-liquid mixture. However, since the installation cavity 22 is equipped with a separation component 40, it can buffer the pressure and flow rate of the gas-liquid mixture flowing out of the liquid tank 10 and the liquid nitrogen cooling screen 11, thereby preventing nitrogen or the gas-liquid mixture from being discharged into the external environment at excessively high pressure and flow rate, and also preventing the loss of liquid nitrogen and the waste of cooling capacity.

[0033] See Figure 2In this embodiment, the receiving cavity 21 is cylindrical. The connection between the inlet pipe 30 and the mounting cavity 22 is located on one side of the axial direction of the receiving cavity 21, while the connection between the outlet pipe 50 and the mounting cavity 22 is located on the other side of the axial direction of the receiving cavity 21. Specifically, the connection between the inlet pipe 30 and the mounting cavity 22 is located at the axial end of the receiving cavity 21, while the connection between the outlet pipe 50 and the mounting cavity 22 is located at the top of the receiving cavity 21 and at the end of the mounting cavity 22 away from the inlet pipe 30. Meanwhile, the separation assembly 40 is installed inside the mounting cavity 22 and located between the inlet pipe 30 and the outlet pipe 50, thereby allowing the gas-liquid mixture to have sufficient settling distance after flowing into the mounting cavity 22 from the inlet pipe 30, improving the settling efficiency of the separation assembly 40 for liquid nitrogen in the gas-liquid mixture.

[0034] Furthermore, in this embodiment, the reflux chamber 23 is located at the bottom of the receiving chamber 21 and below the connection between the inlet pipe 30 and the mounting chamber 22. This allows the liquid nitrogen in the gas-liquid mixture to directly settle into the reflux chamber 23 under the influence of gravity when it flows from the liquid nitrogen cooling screen 11 into the mounting chamber 22, and then flow back from the reflux chamber 23 to the liquid nitrogen cooling screen 11 or the liquid tank 10 along the reflux pipe 60.

[0035] Specifically, in this embodiment, the reflux chamber 23 is only a chamber at the bottom of the receiving chamber 21 near the connection between the inlet pipe 30 and the mounting chamber 22, and its volume is much smaller than that of the mounting chamber 22. That is, the reflux chamber 23 occupies only a small portion of the space at the bottom of the receiving chamber 21. It should be noted that the reflux chamber 23 is provided and located below the connection between the inlet pipe 30 and the mounting chamber 22 so that when the concentration of liquid nitrogen entrained in the gas-liquid mixture is too high, the liquid nitrogen can directly settle into the reflux chamber 23 and flow back into the liquid nitrogen cooling screen 11 along the reflux pipe 60, without having to pass through the separation component 40 for condensation and settling.

[0036] In some other embodiments, the reflux chamber 23 may also fill the bottom of the receiving chamber 21, that is, the entire reflux chamber 23 is located below the mounting chamber 22, so that the liquid nitrogen after condensation and sedimentation of the separation component 40 is collected into the reflux chamber 23 under the action of gravity.

[0037] See Figure 2 A liquid distribution plate 43 is provided between the mounting cavity 22 and the reflux cavity 23, and the liquid distribution plate 43 has multiple through holes to allow liquid nitrogen to flow from the mounting cavity 22 into the reflux cavity 23. The liquid distribution plate 43 also supports the separation component 40 located in the mounting cavity 22 to prevent the separation component 40 from falling into the reflux cavity 23, thereby making the reflux cavity 23 a cavity.

[0038] See Figure 2The separation assembly 40 includes multiple demisters 41 and multiple partition plates 42. The multiple demisters 41 are arranged sequentially within the mounting cavity 22, located between the inlet pipe 30 and the outlet pipe 50, to condense and settle the gas-liquid mixture in stages. In this embodiment, the multiple demisters 41 and multiple partition plates 42 are arranged sequentially along the axial direction of the mounting cavity 22, so that the gas-liquid mixture flowing in from the inlet pipe 30 can pass sequentially through the demisters 41 and partition plates 42, and ultimately be settled and separated by the separation assembly 40, allowing nitrogen gas to flow out of the pressure-stabilizing discharge device 12 from the outlet pipe 50.

[0039] Specifically, in this embodiment, four demisters 41 and three partition plates 42 are provided, so that the three partition plates 42 can space the four demisters 41. It should be noted that in this embodiment, one of the demisters 41 is located entirely in the space of the mounting cavity 22 above the reflux cavity 23, and the other three demisters 41 fill the remaining space in the mounting cavity 22, with the bottoms of the three demisters 41 abutting against the bottom wall of the mounting cavity 22 and also against the bottom wall of the receiving cavity 21.

[0040] In this embodiment, the demister 41 is a filter screen, and the mesh size of multiple filter screens increases sequentially from the inlet pipe 30 to the outlet pipe 50. That is, from the inlet pipe 30 to the outlet pipe 50, the mesh size of the filter screen increases sequentially, so that the subsequent filter screen can further settle the liquid nitrogen in the gas-liquid mixture, and finally achieve the separation of liquid nitrogen and nitrogen gas in the gas-liquid mixture.

[0041] Specifically, the demister 41 is a metal wire mesh, so that liquid nitrogen in the gas-liquid mixture can condense and settle on the demister 41. In some other embodiments, the demister 41 may also be a non-metallic wire mesh, or a baffle-type demister, to condense and settle liquid nitrogen in the gas-liquid mixture.

[0042] In this embodiment, the partition plate 42 is used to allow the gas-liquid mixture to pass through, and the partition plate 42 is installed between adjacent demisters 41 to space them apart. Furthermore, the partition plate 42 has multiple vent holes to allow the gas-liquid mixture to pass through it. It should be noted that the vent holes on each partition plate 42 have different diameters, and the diameters of the vent holes on the partition plate 42 gradually decrease from the inlet pipe 30 to the outlet pipe 50.

[0043] See Figure 2The shell 20 includes an inner liner 24 and an outer shell 25. The inner liner 24 has a receiving cavity 21. The inner liner 24 is installed inside the outer shell 25, and a vacuum layer is formed between the inner liner 24 and the outer shell 25 to create thermal insulation and prevent heat leakage from the inner liner 24. Furthermore, in this embodiment, the vacuum layer is filled with a heat insulation element 26 to enhance the thermal insulation performance between the inner liner 24 and the outer shell 25. The heat insulation element 26 is made of heat-insulating material.

[0044] In summary, after the gas-liquid mixture flows into the mounting cavity 22 from the inlet pipe 30, the liquid nitrogen and nitrogen gas in the gas-liquid mixture are separated by the condensation and settling action of the separation component 40. This allows the nitrogen gas to be discharged from the pressure stabilizing discharge device 12 through the discharge pipe 50. The liquid nitrogen, under the action of gravity, collects in the return cavity 23 and flows back to the liquid nitrogen cooling screen 11 through the return pipe 60. This reduces the amount of liquid nitrogen discharged with the nitrogen gas outside the pressure stabilizing discharge device 12, thereby reducing the loss of liquid nitrogen and reducing heat leakage.

[0045] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pressure-stabilizing and discharge device for a cryogenic container, the cryogenic container comprising a liquid tank for containing liquid nitrogen, and a liquid nitrogen cooling screen disposed within the cryogenic container and communicating with the liquid tank; characterized in that, The pressure stabilizing and discharge device is connected to the liquid nitrogen cooling screen for condensing and settling the gas-liquid mixture flowing out of the liquid nitrogen cooling screen. The pressure stabilizing and discharge device includes: The housing has an internal receiving cavity; the receiving cavity is divided into a communicating mounting cavity and a return cavity, and the return cavity is located at the bottom of the receiving cavity; Inlet pipe; one end of the inlet pipe is connected to the liquid nitrogen cooling screen, and the other end is connected to the mounting cavity, for introducing the gas-liquid mixture in the liquid nitrogen cooling screen into the receiving cavity; A separation assembly, disposed within the mounting cavity, is used to separate liquid nitrogen and nitrogen gas in a gas-liquid mixture, and to allow the liquid nitrogen to settle, enabling it to settle from the mounting cavity into the reflux cavity under gravity. The separation assembly includes multiple demisters and multiple partition plates. The multiple demisters are arranged sequentially within the mounting cavity and located between the inlet pipe and the outlet pipe to condense and settle the gas-liquid mixture in stages. The partition plates allow the gas-liquid mixture to pass through, and the partition plates are installed between adjacent demisters. An exhaust pipe, which connects to the mounting cavity and is located at the top of the mounting cavity, is used to exhaust nitrogen gas; A reflux pipe; one end of the reflux pipe is connected to the liquid nitrogen cooling screen, and the other end is connected to the bottom of the reflux cavity, so as to reflux the liquid nitrogen in the reflux cavity back into the liquid nitrogen cooling screen.

2. The pressure-stabilizing discharge device according to claim 1, characterized in that, The defoaming component is a filter screen.

3. The pressure-stabilizing discharge device according to claim 2, characterized in that, From the inlet pipe to the outlet pipe, the mesh size of the multiple filter screens increases sequentially.

4. The pressure-stabilizing discharge device according to claim 1, characterized in that, The partition plate has multiple vent holes so that the gas-liquid mixture can pass through the partition plate.

5. The pressure-stabilizing discharge device according to claim 1, characterized in that, A liquid distribution plate is provided between the mounting cavity and the reflux cavity; the liquid distribution plate has multiple through holes so that the liquid nitrogen can flow from the mounting cavity to the reflux cavity through the through holes.

6. The pressure-stabilizing discharge device according to claim 1, characterized in that, The shell includes an inner liner and an outer shell; the inner liner is installed inside the outer shell, and a vacuum layer is formed between the inner liner and the outer shell; the inner liner has the receiving cavity.

7. The pressure-stabilizing discharge device according to claim 6, characterized in that, The vacuum layer is equipped with heat insulation components.

8. The pressure-stabilizing discharge device according to claim 1, characterized in that, The receiving cavity is cylindrical; the connection between the inlet pipe and the mounting cavity is located on one side of the axial direction of the receiving cavity, and the connection between the outlet pipe and the mounting cavity is located on the other side of the axial direction of the receiving cavity.

9. A cryogenic container, characterized in that, The cryogenic container includes an outer shell, a storage tank for storing cryogenic media, a liquid tank for loading liquid nitrogen, a liquid nitrogen cooling screen for regulating temperature, and a pressure stabilizing and discharging device as described in any one of claims 1-8; the storage tank, the liquid tank, the liquid nitrogen cooling screen, and the pressure stabilizing and discharging device are all disposed inside the outer shell; the liquid nitrogen cooling screen is installed on the outer wall of the storage tank; the pressure stabilizing and discharging device is connected to the liquid tank through the liquid nitrogen cooling screen and is located above the liquid nitrogen cooling screen.

Images