An apparatus and method for integrating automatic liquid nitrogen addition and vacuum pumping of a superconducting suspension device

Abstract

The present invention provides a device and method for automatically adding liquid nitrogen and evacuating air in an integrated manner for a superconducting suspension device, which relates to the technical field of superconducting magnetic levitation technology and includes a double-layer pipeline, a superconducting suspension device, and a vacuum pumping device. The double-layer pipeline includes an outer vacuum pipe and an inner liquid nitrogen pipe. The central axis of the liquid nitrogen pipe coincides with the central axis of the vacuum pipe, and a gap is provided between the outer wall of the liquid nitrogen pipe and the inner wall of the vacuum pipe. The superconducting suspension device is located on the side of the double-layer pipeline. The vacuum pipe is connected to the vacuum pumping interface of the superconducting suspension device through a first interface, and the liquid nitrogen pipe is connected to the liquid nitrogen inlet of the superconducting suspension device through a second interface. Through the double-layer pipeline, the present invention realizes the multi-purpose use of one pipe. Liquid nitrogen is filled into the superconducting suspension device through the inner liquid nitrogen pipe. The vacuum layer between the outer wall of the liquid nitrogen pipe and the inner wall of the vacuum pipe serves as the vacuum evacuation and maintenance pipeline for the superconducting suspension device on the one hand, and on the other hand, insulates the liquid nitrogen filled into the superconducting suspension device by the inner liquid nitrogen pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting magnetic levitation, and more specifically, to a device and method for automatically adding liquid nitrogen and evacuating air in an integrated manner for a superconducting suspension device. Background Art

[0002] A superconducting suspension device consists of superconducting bulk materials, a liquid nitrogen container, and a vacuum container. The vacuum container plays a role in maintaining low temperature. The superconducting bulk materials inside it are under the continuous low temperature provided by the liquid nitrogen container, enabling the superconducting suspension device to levitate above the track. Therefore, the liquid nitrogen heat preservation time of the superconducting suspension device and the vacuum degree of the vacuum container are key factors in the performance of the superconducting suspension device. In transportation, multiple superconducting suspension devices are arranged on each suspension frame to meet the usage requirements of the levitation weight. In the prior art, different devices are used to add liquid nitrogen and evacuate air for each superconducting suspension device one by one, which has a large workload and cumbersome operation. In addition, when the vacuum degree of a single superconducting suspension device is lost in engineering applications, it cannot repair or maintain its normal state by itself, resulting in accelerated evaporation of liquid nitrogen and rapid loss of the levitation performance of the superconducting suspension device. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for automatically adding liquid nitrogen and evacuating air in an integrated manner for a superconducting suspension device to solve the above problems. To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0004] On the one hand, the present application provides a device for automatically adding liquid nitrogen and evacuating air in an integrated manner for a superconducting suspension device, including: a double-layer pipeline, a superconducting suspension device, and a vacuum pumping device. The double-layer pipeline, the double-layer pipeline includes an outer vacuum pipe and an inner liquid nitrogen pipe. The central axis of the liquid nitrogen pipe coincides with the central axis of the vacuum pipe. There is a gap between the outer wall of the liquid nitrogen pipe and the inner wall of the vacuum pipe, and the gap is a vacuum layer. The superconducting suspension device is located on the side of the double-layer pipeline. On the side of the vacuum pipe and the liquid nitrogen pipe close to the superconducting suspension device, there are respectively a first interface and a second interface. The number and position of the first interface and the second interface correspond to the number and position of the superconducting suspension device. The vacuum pipe is connected to the superconducting suspension device through the first interface, and the liquid nitrogen pipe is connected to the superconducting suspension device through the second interface. The vacuum pumping device is connected to the vacuum pipe.

[0005] On the other hand, the present application also provides a method for automatically adding liquid nitrogen and evacuating air for a superconducting suspension device, including:

[0006] Obtaining in real time the pressure value of the vacuum layer inside the superconducting suspension device and the pressure value of the vacuum layer inside the vacuum pipe;

[0007] When the pressure value of the vacuum layer in the superconducting suspension device is greater than the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube is greater than the second preset pressure value, the vacuum pumping device, the vacuum baffle valve and the high-vacuum solenoid valve are turned on to perform vacuum preparation on the vacuum layers of the superconducting suspension device and the vacuum tube. When the pressure value of the vacuum layer in the superconducting suspension device is less than or equal to the third preset pressure value, the high-vacuum solenoid valve is closed. When the pressure value of the vacuum layer in the vacuum tube is less than or equal to the fourth preset pressure value, the vacuum baffle valve and the vacuum pumping device are closed;

[0008] When the pressure value of the vacuum layer in the superconducting suspension device is greater than the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube is less than or equal to the second preset pressure value, the high-vacuum solenoid valve is first turned on to supplement the vacuum of the vacuum layer in the vacuum tube to the vacuum of the vacuum layer in the superconducting suspension device. When the pressure value of the vacuum layer in the vacuum tube is greater than the second preset pressure value during the supplement process, the vacuum pumping device and the vacuum baffle valve are turned on. When the pressure value of the vacuum layer in the superconducting suspension device is less than or equal to the third preset pressure value, the high-vacuum solenoid valve is closed. When the pressure value of the vacuum layer in the vacuum tube is less than or equal to the fourth preset pressure value, the vacuum baffle valve and the vacuum pumping device are closed;

[0009] When the pressure value of the vacuum layer in the superconducting suspension device is less than or equal to the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube is greater than the second preset pressure value, the vacuum pumping device and the vacuum baffle valve are turned on. When the pressure value of the vacuum layer in the vacuum tube is less than or equal to the fourth preset pressure value, the vacuum baffle valve and the vacuum pumping device are closed;

[0010] Keep the pressure value of the vacuum layer in the superconducting suspension device less than or equal to the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube less than or equal to the second preset pressure value. When the liquid level indicator shows that the liquid nitrogen level in the superconducting suspension device is lower than the preset liquid level, pre-cool the liquid nitrogen pipe. After the pre-cooling is completed, turn on the cryogenic solenoid valve to inject liquid nitrogen into the superconducting suspension device until it is full of liquid nitrogen, and then close the cryogenic solenoid valve.

[0011] The beneficial effects of the present invention are as follows:

[0012] Through the double-layer pipeline, the present invention realizes the multi-purpose use of one pipe. Liquid nitrogen is filled into the superconducting suspension device through the inner pipeline. Through the vacuum layer between the outer pipeline and the inner pipeline, on the one hand, it serves as the vacuum evacuation and maintenance pipeline of the superconducting suspension device, and on the other hand, it insulates the path of filling liquid nitrogen into the superconducting suspension device through the inner pipeline.

[0013] Other features and advantages of the present invention will be described in the subsequent specification, and part of them will become obvious from the specification, or be understood by implementing the embodiments of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures specifically pointed out in the written specification, claims, and drawings. Brief Description of the Drawings

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of the device for integrating automatic liquid nitrogen addition and vacuum pumping of the present invention;

[0016] Figure 2 It is a schematic diagram of the position settings of the liquid nitrogen inlet, liquid nitrogen detection port, vacuum layer pressure value detection port, and vacuum pumping interface of the superconducting suspension device;

[0017] Figure 3 It is a schematic flowchart of the method for automatic liquid nitrogen addition and vacuum pumping of the present invention.

[0018] Markings in the figure:

[0019] 1. Third interface; 2. Superconducting suspension device; 3. Low-temperature solenoid valve; 4. High-vacuum solenoid valve; 5. Vacuum pumping device; 6. Fourth interface; 7. Vacuum tube; 8. Liquid nitrogen tube; 9. First interface; 10. Second interface; 21. Liquid nitrogen inlet; 22. Liquid nitrogen detection port; 23. Vacuum layer pressure value detection port; 24. Vacuum pumping interface. Specific embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] It should be noted that: Similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present invention, terms such as "first" and "second" are only used for differential description and cannot be understood as indicating or implying relative importance.

[0022] Embodiment 1:

[0023] As Figure 1 shown, this embodiment provides a device for automatically adding liquid nitrogen and evacuating air in an integrated manner for a superconducting levitator, including: a double-layer pipe, a superconducting levitator 2, and an air evacuation device 5. The double-layer pipe includes an outer vacuum pipe 7 and an inner liquid nitrogen pipe 8; the central axis of the liquid nitrogen pipe 8 coincides with the central axis of the vacuum pipe 7; there is a gap between the outer wall of the liquid nitrogen pipe 8 and the inner wall of the vacuum pipe 7.

[0024] It should be noted that the number of superconducting levitators 2 can be one or more. As Figure 1 shown, in this embodiment, the number of superconducting levitators 2 is multiple, and the double-layer pipe is U-shaped. Figure 1 Both end faces of the U-shaped double-layer pipe should be closed surfaces. Figure 1 The end faces are not drawn to show the positional relationship between the vacuum pipe 7 and the liquid nitrogen pipe 8.

[0025] The gap between the outer wall of the liquid nitrogen pipe 8 and the inner wall of the vacuum pipe 7 is a vacuum layer. When the liquid nitrogen pipe 8 injects liquid nitrogen into the superconducting levitator 2, the vacuum layer of the vacuum pipe 7 provides a heat preservation environment for the liquid nitrogen pipe 8. When the superconducting levitator 2 needs to be evacuated, the excess gas in the superconducting levitator 2 is sent out through the vacuum layer of the vacuum pipe 7.

[0026] In this embodiment, both the vacuum pipe 7 and the liquid nitrogen pipe 8 are made of 304 stainless steel to prevent rust and moisture. To keep the liquid nitrogen pipe 8 suspended inside the vacuum pipe 7, rib plates need to be provided between the liquid nitrogen pipe 8 and the vacuum pipe 7, and the rib plates are made of materials with low thermal conductivity.

[0027] In this embodiment, multiple superconducting levitators 2 are located on both sides of the U-shaped double-layer pipe. At least one first interface 9 and at least one second interface 10 are respectively provided on the sides of the vacuum pipe 7 and the liquid nitrogen pipe 8 close to the superconducting levitator 2. The number and positions of the first interfaces 9 and the second interfaces 10 correspond to the number and positions of the superconducting levitators 2. The vacuum pipe 7 is connected to the superconducting levitator 2 through the first interface 9, and the liquid nitrogen pipe 8 is connected to the superconducting levitator 2 through the second interface 10.

[0028] The air evacuation device 5 is arranged in the middle of the two vertical sections of the U-shaped double-layer pipe. The air evacuation device 5 is provided with two air extraction pipes, which are respectively connected to the vacuum pipes 7 on both sides of the air evacuation device 5. A vacuum baffle valve is provided at the connection between the air evacuation device 5 and the vacuum pipe 7.

[0029] It is not difficult to understand that the function of the air evacuation device 5 is: on the one hand, to evacuate the superconducting levitator 2, and on the other hand, to evacuate the gap between the outer wall of the liquid nitrogen pipe 8 and the inner wall of the vacuum pipe 7.

[0030] In this embodiment, the air evacuation device 5 adopts a combined device of a scroll vacuum pump and a molecular pump.

[0031] As Figure 2 shown, the superconducting suspension device 2 box body is provided with a liquid nitrogen inlet 21, a liquid nitrogen detection port 22, a vacuum layer pressure value detection port 23 and a vacuum pumping interface 24; the liquid nitrogen inlet 21 is connected to a liquid nitrogen pipe 8 through a second interface 10; the liquid nitrogen detection port 22 is connected to a liquid level indicator; the vacuum layer pressure value detection port 23 is connected to a first pressure value detection device for measuring the pressure value of the vacuum layer inside the superconducting suspension device 2; the vacuum pumping interface 24 is connected to a vacuum pipe 7 through a first interface 9.

[0032] It should be noted that the liquid level indicator can be a liquid level gauge or a temperature measurement sensor.

[0033] The bottom of the U-shaped double-layer pipe is provided with a third interface 1 for connecting to a liquid nitrogen tank.

[0034] It can be understood that the device of this embodiment is installed on a maglev train. In actual applications, since the liquid nitrogen tank is large in volume and not convenient to be installed on a maglev train, the liquid nitrogen tank is usually arranged at a station or a place specially used for filling liquid nitrogen.

[0035] Both ends of the U-shaped double-layer pipe are provided with a fourth interface 6, and the fourth interface 6 is connected to a second pressure value detection device. The second pressure value detection device is used for measuring the pressure value of the vacuum layer inside the vacuum pipe 7 and can be used to judge whether the vacuum pipe 7 leaks air.

[0036] In this embodiment, both the first pressure value detection device and the second pressure value detection device are selected as vacuum gauges of model RBF-181-KF25.

[0037] A high-vacuum solenoid valve 4 is provided at the connection between the first interface 9 and the vacuum pumping interface 24. When there are multiple superconducting suspension devices 2, the high-vacuum solenoid valves 4 connected to each superconducting suspension device 2 can be independently opened and closed.

[0038] A cryogenic solenoid valve 3 is provided at the connection between the second interface 10 and the liquid nitrogen inlet 21. When there are multiple superconducting suspension devices 2, the cryogenic solenoid valves 3 connected to each superconducting suspension device 2 can be independently opened and closed.

[0039] It should be noted that each high-vacuum solenoid valve 4 and each cryogenic solenoid valve 3 can be individually opened. When the first pressure value detection device connected to a single superconducting suspension device 2 shows that the vacuum of the vacuum layer of this superconducting suspension device 2 is lost, the high-vacuum solenoid valve 4 connected to this superconducting suspension device 2 is controlled to open to pump vacuum for this superconducting suspension device 2. When the liquid level indicator connected to a single superconducting suspension device 2 shows that this superconducting suspension device 2 needs to be filled with liquid nitrogen, the cryogenic solenoid valve 3 connected to this superconducting suspension device 2 is controlled to open to fill liquid nitrogen for this superconducting suspension device 2.

[0040] The device proposed in this application has good heat preservation effect during the liquid nitrogen injection process. By setting a layer of vacuum tube 7 outside the liquid nitrogen tube 8, it replaces the heat preservation layer of the traditional low-temperature liquid filling tube. The double-layer pipeline controls multiple superconducting levitators 2 to add liquid nitrogen and evacuate the air, saving pipe materials and pipeline installation space, and reducing the use and maintenance costs.

[0041] Embodiment 2:

[0042] Corresponding to the device in the above embodiment, as Figure 3 shown, this embodiment proposes a method for automatically adding liquid nitrogen and evacuating the air of a superconducting levitator, including:

[0043] S100. Obtain the pressure value of the vacuum layer in the superconducting levitator 2 and the pressure value of the vacuum layer in the vacuum tube 7 in real time.

[0044] It should be noted that the pressure value of the vacuum layer in the superconducting levitator 2 is obtained by the first pressure value detection device, and the pressure value of the vacuum layer in the vacuum tube 7 is obtained by the second pressure value detection device.

[0045] S210. When the pressure value of the vacuum layer in the superconducting levitator 2 is greater than the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube 7 is greater than the second preset pressure value, turn on the vacuum pumping device 5, the vacuum baffle valve and the high-vacuum solenoid valve 4 to perform vacuum preparation on the superconducting levitator 2 and the vacuum tube 7. When the pressure value of the vacuum layer in the superconducting levitator 2 is less than or equal to the third preset pressure value, close the high-vacuum solenoid valve 4. When the pressure value of the vacuum layer in the vacuum tube 7 is less than or equal to the fourth preset pressure value, close the vacuum baffle valve and the vacuum pumping device 5;

[0046] S220. When the pressure value of the vacuum layer in the superconducting levitator 2 is greater than the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube 7 is less than or equal to the second preset pressure value, first turn on the high-vacuum solenoid valve 4 to supplement the vacuum in the vacuum tube 7 to the vacuum in the superconducting levitator 2. When the pressure value of the vacuum layer in the vacuum tube 7 is greater than the second preset pressure value during the supplement process, turn on the vacuum pumping device 5 and the vacuum baffle valve. When the pressure value of the vacuum layer in the superconducting levitator 2 is less than or equal to the third preset pressure value, close the high-vacuum solenoid valve 4. When the pressure value of the vacuum layer in the vacuum tube 7 is less than or equal to the fourth preset pressure value, close the vacuum baffle valve and the vacuum pumping device 5;

[0047] S230. When the pressure value of the vacuum layer in the superconducting levitator 2 is less than or equal to the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube 7 is greater than the second preset pressure value, turn on the vacuum pumping device 5 and the vacuum baffle valve. When the pressure value of the vacuum layer in the vacuum tube 7 is less than or equal to the fourth preset pressure value, close the vacuum baffle valve and the vacuum pumping device 5.

[0048] It should be noted that steps S210 - S230 are parallel steps, and their purpose is to keep the pressure value of the vacuum layer in the superconducting suspension device 2 less than or equal to the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube 7 less than or equal to the second preset pressure value in real time. When liquid nitrogen needs to be filled into the superconducting suspension device 2, liquid nitrogen is filled into the superconducting suspension device 2.

[0049] The first preset pressure value is 10 Pa. When the pressure value of the vacuum layer in the superconducting suspension device 2 is greater than 10 Pa, the liquid nitrogen in the superconducting suspension device 2 is likely to volatilize, and the heat preservation and insulation effect decreases. Therefore, at this time, the superconducting suspension device 2 needs to be evacuated. The second preset pressure value is 1 Pa. When the pressure value of the vacuum layer in the vacuum tube 7 is greater than 1 Pa, the heat preservation and insulation ability of the vacuum tube 7 for the liquid nitrogen tube 8 is poor, resulting in easy volatilization of the liquid nitrogen during the transportation of the liquid nitrogen tube 8. Therefore, at this time, the vacuum tube 7 needs to be evacuated.

[0050] The third preset pressure value is 1×10 -2 Pa. When the pressure value of the vacuum layer in the superconducting suspension device 2 ≤ 1×10 -2 Pa, the superconducting suspension device 2 has a good heat preservation and insulation effect on liquid nitrogen. The fourth preset pressure value is 1×10 -3 Pa. When the pressure value of the vacuum layer in the vacuum tube 7 ≤ 1×10 -3 Pa, the vacuum layer in the vacuum tube 7 has a good heat preservation and insulation effect on the liquid nitrogen in the liquid nitrogen tube 8, and the volatilization of the liquid nitrogen during the transportation in the liquid nitrogen tube 8 is small.

[0051] When the pressure value of the vacuum layer in the superconducting suspension device 2 ≤ 10 Pa and the pressure value of the vacuum layer in the vacuum tube 7 ≤ 1 Pa, the pressure value requirements for liquid nitrogen filling are met, making the pressure value of the vacuum layer in the superconducting suspension device 2 ≤ 1×10 -2 Pa and the pressure value of the vacuum layer in the vacuum tube 7 ≤ 1×10 -3 Pa. On the one hand, it is used to further reduce the volatilization of liquid nitrogen during the liquid nitrogen filling process, and on the other hand, it is also to avoid the frequent opening and closing of the vacuum pumping device 5. If the vacuum pumping device 5 is closed whenever the pressure value of the vacuum layer in the superconducting suspension device 2 ≤ 10 Pa and the vacuum pumping device 5 is opened whenever the pressure value of the vacuum layer in the superconducting suspension device 2 > 10 Pa, or the vacuum pumping device 5 is closed whenever the pressure value of the vacuum layer in the vacuum tube 7 ≤ 1 Pa and the vacuum pumping device 5 is opened whenever the pressure value of the vacuum layer in the vacuum tube 7 > 1 Pa, it will cause the frequent opening and closing of the vacuum pumping device 5.

[0052] S300. Keep the pressure value of the vacuum layer in the superconducting suspension device 2 less than or equal to the first preset pressure value and keep the pressure value of the vacuum layer in the vacuum tube 7 less than or equal to the second preset pressure value. When the liquid level indicator shows that the liquid nitrogen level in the superconducting suspension device 2 is lower than the preset liquid level, pre-cool the liquid nitrogen pipe 8. After the pre-cooling is completed, open the cryogenic solenoid valve 3 to inject liquid nitrogen into the superconducting suspension device 2 until it is full of liquid nitrogen, and then close the cryogenic solenoid valve 3.

[0053] The preset liquid level is the liquid level at which the superconducting suspension device 2 needs to be filled with liquid nitrogen, and it is set according to the actual situation. In practical applications, it can be set that the superconducting suspension device 2 is filled with liquid nitrogen every twelve hours of operation. The liquid level indicator can be a liquid level gauge or a temperature measurement sensor. When the temperature shown by the temperature measurement sensor is closer to the liquid nitrogen temperature range, it means that the liquid nitrogen level is closer to the liquid nitrogen detection port 22. Through Figure 2 It can be known that the liquid nitrogen detection port 22 is arranged at the top of the superconducting suspension device 2. Therefore, when the temperature shown by the temperature measurement sensor is -196 degrees Celsius, it is considered that the superconducting suspension device 2 is full of liquid nitrogen. When the temperature shown by the temperature measurement sensor is higher than the preset temperature, it means that the liquid nitrogen level is lower than the preset liquid level, and the superconducting suspension device 2 needs to be filled with liquid nitrogen.

[0054] The purpose of setting the first pre-pressure value > the second preset pressure value > the third preset pressure value > the fourth pre-pressure value is to keep the pressure value of the vacuum layer in the vacuum tube 7 lower than the pressure value of the vacuum layer in the superconducting suspension device 2 in real time. When there are multiple superconducting suspension devices 2 and the pressure values of the vacuum layers of a smaller number of superconducting suspension devices 2 are greater than 10 Pa, first open the high-vacuum solenoid valves 4 connected to these superconducting suspension devices 2 to supplement the vacuum in the vacuum layer of the vacuum tube 7 to the vacuum in the vacuum layer of the superconducting suspension device 2, so that the pressure values of the vacuum layers of these superconducting suspension devices 2 drop to meet the requirements, while the pressure value of the vacuum layer in the vacuum tube 7 still does not exceed 1 Pa, avoiding frequent opening and closing of the vacuum pumping device 5.

[0055] This application can simultaneously perform vacuum preparation and liquid nitrogen filling for multiple superconducting suspension devices 2, with high working efficiency. It can also perform vacuum preparation and liquid nitrogen filling for a single superconducting suspension device 2, avoiding the loss of the pressure value of the vacuum layer of a single superconducting suspension device 2. And the vacuum preparation and liquid nitrogen filling are carried out independently. During the actual operation of the train, this application can keep the pressure values of the vacuum layers of the superconducting suspension device 2 and the vacuum tube 7 in real time and perform liquid nitrogen filling when the superconducting suspension device 2 needs to be filled with liquid nitrogen.

[0056] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0057] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An integrated device for automatically adding liquid nitrogen and evacuating air in a superconducting suspension device, characterized in that, Comprising: A double-layer pipeline, the double-layer pipeline comprising an outer vacuum tube (7) and an inner liquid nitrogen tube (8); The central axis of the liquid nitrogen tube (8) coincides with the central axis of the vacuum tube (7); there is a gap between the outer wall of the liquid nitrogen tube (8) and the inner wall of the vacuum tube (7), and the gap is a vacuum layer; a superconducting suspension device (2), the superconducting suspension device (2) is located on the side of the double-layer pipeline, and a first interface (9) and a second interface (10) are respectively provided on one side of the vacuum tube (7) and the liquid nitrogen tube (8) close to the superconducting suspension device (2), and the number and positions of the first interface (9) and the second interface (10) correspond to the number and positions of the superconducting suspension device (2), the vacuum tube (7) is connected to the superconducting suspension device (2) through the first interface (9), and the liquid nitrogen tube (8) is connected to the superconducting suspension device (2) through the second interface (10); A vacuum pumping device (5), the vacuum pumping device (5) is connected to the vacuum layer of the vacuum tube (7); Wherein, it is characterized in that a liquid nitrogen inlet (21), a liquid nitrogen detection port (22), a vacuum layer pressure value detection port (23) and a vacuum pumping interface (24) are provided on the box body of the superconducting suspension device (2); the liquid nitrogen inlet (21) is connected to the liquid nitrogen tube (8) through the second interface (10); the liquid nitrogen detection port (22) is connected to a liquid level indicator; the vacuum layer pressure value detection port (23) is connected to a first pressure value detection device; the vacuum pumping interface (24) is connected to the vacuum tube (7) through the first interface (9); Wherein, a fourth interface (6) is provided at the end of the double-layer pipeline, and the fourth interface (6) is connected to a second pressure value detection device; Wherein, a high-vacuum solenoid valve (4) is provided at the connection between the first interface (9) and the vacuum pumping interface (24), and when there are multiple superconducting suspension devices (2), the high-vacuum solenoid valves (4) connected to each superconducting suspension device (2) can be independently opened and closed; Wherein, a cryogenic solenoid valve (3) is provided at the connection between the second interface (10) and the liquid nitrogen inlet (21), and when there are multiple superconducting suspension devices (2), the cryogenic solenoid valves (3) connected to each superconducting suspension device (2) can be independently opened and closed; Wherein, a vacuum baffle valve is provided at the connection between the vacuum pumping device (5) and the vacuum tube (7).

2. The device for automatically adding liquid nitrogen and evacuating air in an integrated manner for the superconducting suspension device according to claim 1, wherein One end of the double-layer pipeline is provided with a third interface (1) for connecting a liquid nitrogen tank.

3. The device for automatically adding liquid nitrogen and evacuating air in the superconducting suspension device according to claim 1, wherein The liquid level indicator is a liquid level gauge or a temperature measuring sensor.

4. A method for automatically adding liquid nitrogen and evacuating a superconducting levitator, characterized in that, Using a device for automatic liquid nitrogen addition and vacuum pumping integration of a superconducting suspension device according to any one of claims 1-3, comprising: Obtaining in real time the pressure value of the vacuum layer in the superconducting suspension device (2) and the pressure value of the vacuum layer in the vacuum tube (7); When the pressure value of the vacuum layer in the superconducting suspension device (2) is greater than the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube (7) is greater than the second preset pressure value, the vacuum pumping device (5), the vacuum baffle valve and the high-vacuum solenoid valve (4) are turned on to perform vacuum preparation on the superconducting suspension device (2) and the vacuum tube (7). When the pressure value of the vacuum layer in the superconducting suspension device (2) is less than or equal to the third preset pressure value, the high-vacuum solenoid valve (4) is closed. When the pressure value of the vacuum layer in the vacuum tube (7) is less than or equal to the fourth preset pressure value, the vacuum baffle valve and the vacuum pumping device (5) are closed; When the pressure value of the vacuum layer in the superconducting suspension device (2) is greater than the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube (7) is less than or equal to the second preset pressure value, the high-vacuum solenoid valve (4) is first turned on to supplement the vacuum in the vacuum tube (7) to the vacuum in the superconducting suspension device (2); When the pressure value of the vacuum layer in the vacuum tube (7) is greater than the second preset pressure value during the supplementing process, the vacuum pumping device (5) and the vacuum baffle valve are turned on. When the pressure value of the vacuum layer in the superconducting suspension device (2) is less than or equal to the third preset pressure value, the high-vacuum solenoid valve (4) is closed. When the pressure value of the vacuum layer in the vacuum tube (7) is less than or equal to the fourth preset pressure value, the vacuum baffle valve and the vacuum pumping device (5) are closed; When the pressure value of the vacuum layer in the superconducting suspension device (2) is less than or equal to the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube (7) is greater than the second preset pressure value, the vacuum pumping device (5) and the vacuum baffle valve are turned on. When the pressure value of the vacuum layer in the vacuum tube (7) is less than or equal to the fourth preset pressure value, the vacuum baffle valve and the vacuum pumping device (5) are closed; Keep the pressure value of the vacuum layer in the superconducting suspension device (2) less than or equal to the first preset pressure value and the pressure value of the vacuum layer in the vacuum tube (7) less than or equal to the second preset pressure value. When the liquid level indicator shows that the liquid nitrogen level in the superconducting suspension device (2) is lower than the preset liquid level, pre-cool the liquid nitrogen tube (8). After the pre-cooling is completed, turn on the cryogenic solenoid valve (3) to inject liquid nitrogen into the superconducting suspension device (2) until it is full of liquid nitrogen, and then close the cryogenic solenoid valve (3).

5. The method for automatically adding liquid nitrogen and evacuating the superconducting magnetic levitator according to claim 4, characterized in that, The first preset pressure value > the second preset pressure value > the third preset pressure value > the fourth preset pressure value.

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