Heat insulation supporting device for low-temperature refrigerator storage tank of superconducting maglev train

Abstract

The invention provides a heat insulation supporting device for a low-temperature refrigerator storage tank of a superconducting maglev train. Comprising an outer Dewar, and a cold shield, a first central supporting rod, a liquid helium storage tank, a first heat exchanger clamping ring, a second heat exchanger clamping ring, supporting fins, a first flange, a second flange, a third flange, a fourth flange, a fifth flange, a second central supporting rod and a liquid nitrogen storage tank which are arranged in the outer Dewar. The heat transfer path from the outer Dewar to the left end of the liquid helium storage tank is prolonged; a preset gap is formed between the supporting fin and the second cold shield end cover to prevent thermal short circuit; the supporting fins are connected to the other end of the first center supporting rod, a path is fully prolonged, heat leakage is reduced, the first center supporting rod is provided with a right supporting point, a reliable two-end fixed supporting structure is formed, heat leakage is reduced, and high vibration resistance is achieved. The second central supporting rod is not in contact with the liquid nitrogen storage tank, so that the heat transfer path from the outer Dewar to the liquid nitrogen storage tank is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting magnetic levitation, and in particular to a heat insulation support device for a low-temperature refrigerator storage tank of a superconducting magnetic levitation train. Background Art

[0002] The Dewar superconducting coils in the superconducting magnets of the superconducting maglev train need to be cooled to the liquid helium temperature zone (4.5K) to reach the superconducting state and generate suspension and propellant guiding force. In order to maintain the ultra-low temperature superconducting state, the liquid helium soaking the superconducting coils needs to be continuously replenished. Due to the inevitable heat leakage from the external room temperature and liquid nitrogen temperature zone, the liquid helium will continue to evaporate into helium gas. Therefore, an ultra-low temperature 4.5K refrigerator is needed to further cool the cold helium gas and condense it into liquid to achieve a liquid helium closed loop.

[0003] The efficiency (COP) of domestically produced liquid helium 4.5K refrigerators is only 0.06-0.07%, and the efficiency of vehicle-mounted refrigerators is even lower. One of the main limiting factors is the large heat leakage of the internal support insulation structure of the 4.5K refrigerator tank. The efficiency of vehicle-mounted refrigerators on Japan's Yamanashi Line and the Central Maglev Shinkansen, which will be put into operation after 2034, can reach 0.1%, and they also have 10g vibration resistance.

[0004] Due to the limited efficiency of ultra-low temperature refrigerators in ultra-low temperature environments, reducing the heat leakage of the refrigerator tank support structure by even 1% in a limited space will be a major breakthrough in improving the efficiency of the refrigerator. At the same time, as a vehicle-mounted refrigerator, it is necessary to have engineering capabilities to resist vibration. Enhancing the load-bearing capacity and reducing heat leakage have become the core goals of the design of the refrigerator insulation support structure. However, the design of the detachable insulation support structure needs to consider the influence of multiple factors such as structural form, material selection, stiffness matching, heat transfer, and detachable maintenance, and the design scheme is relatively complex.

[0005] At present, the tank support structures are all refrigeration machine support structures that are used for static placement and have no confined space and vibration resistance requirements. They do not involve vehicle-mounted vibration resistance, confined space, ultra-low heat leakage and detachable functions, and are not suitable for vehicle-mounted refrigeration machines. Summary of the invention

[0006] The present invention provides a heat-insulating support device for a low-temperature refrigerator tank of a superconducting maglev train, which can solve the technical problem in the prior art that the tank support structure is not suitable for an on-board refrigerator.

[0007] The present invention provides a heat insulation support device for a low-temperature refrigerator storage tank of a superconducting maglev train, the device comprising an outer dewar and a cold shield arranged in the outer dewar, a first central support rod, a liquid helium storage tank, a first heat exchanger clamp ring, a second heat exchanger clamp ring, support fins, a first flange, a second flange, a third flange, a fourth flange, a fifth flange, a second central support rod, and a liquid nitrogen storage tank;

[0008] The outer Dewar comprises an outer Dewar body, a first outer Dewar end cap and a second outer Dewar end cap, one end of the outer Dewar body is sealed and connected to the first outer Dewar end cap, and the other end is sealed and connected to the second outer Dewar end cap;

[0009] The cold shield comprises a cold shield body, a first cold shield end cover and a second cold shield end cover, one end of the cold shield body is connected to the first cold shield end cover, and the other end is connected to the second cold shield end cover;

[0010] One end of the first central support rod is connected to the first outer dewar end cover, and the other end passes through the first cold shield end cover and the second cold shield end cover and then extends out of the cold shield; the first cold shield end cover and the first central support rod are connected via the first flange; the second cold shield end cover and the first central support rod are connected via the second flange;

[0011] The liquid helium storage tank is disposed in the cold shield, and the liquid helium storage tank is an annular cavity structure, which is sleeved on the first central support rod and does not contact the first central support rod, and one end of the liquid helium storage tank close to the first cold shield end cover is connected to the first central support rod through the third flange;

[0012] The first heat exchanger clamping ring is connected to the first central support rod and is located between the first outer Dewar end cover and the first cold shield end cover, and the first heat exchanger clamping ring is used to install the heat exchanger;

[0013] The second heat exchanger clamp ring is arranged in the cold shield and between the first cold shield end cover and the liquid helium storage tank; the second heat exchanger clamp ring is connected to the first central support rod for installing the heat exchanger;

[0014] One end of the support fin is connected to the other end of the first central support rod through the second flange, and the other end is connected to the inner wall of the outer dewar body; there is a preset gap between the support fin and the second cold shield end cover;

[0015] One end of the second central support rod is connected to the second outer Dewar end cover via the fourth flange;

[0016] The liquid nitrogen storage tank is located between the supporting fins and the second outer Dewar end cover. The liquid nitrogen storage tank is an annular cavity structure, which is sleeved on the second central support rod and does not contact the second central support rod. One end of the liquid nitrogen storage tank close to the second cold shield end cover is connected to the other end of the second central support rod through the fifth flange.

[0017] Preferably, the first flange is made of red copper; the second flange, the third flange, the fourth flange and the fifth flange are all made of stainless steel plus a layer of glass fiber gasket; the first center support rod is made of carbon fiber reinforced composite material or alumina fiber reinforced composite material; the second center support rod is made of glass fiber material or alumina fiber reinforced composite material.

[0018] Preferably, the supporting fins include 6 fins that are equally spaced along the circumferential direction, and the interior of each fin is made of stainless steel material and the exterior is made of fiberglass shell.

[0019] Preferably, the first heat exchanger clamping ring and the second heat exchanger clamping ring have the same structure, and both include a first semicircular tube, a second semicircular tube, a first connecting bolt, a second connecting bolt, a first semicircular ring, a second semicircular ring, a first connecting screw, a second connecting screw, a first fixing portion and a second fixing portion; the first semicircular tube and the second semicircular tube are sleeved on the first central support rod, and the two ends of the first semicircular tube and the second semicircular tube are fixed by the first connecting bolt and the second connecting bolt; the first semicircular ring and the second semicircular ring are arranged opposite to each other and are used to surround the heat exchanger, and the two ends of the first semicircular ring and the second semicircular ring are fixed by the first connecting screw and the second connecting screw, and the circumferential fixation of the heat exchanger is achieved by adjusting the connection length of the first connecting screw and the second connecting screw; the first fixing portion is used to fix the first semicircular ring to the first semicircular tube and the second semicircular tube; the second fixing portion is used to achieve axial fixation of the heat exchanger.

[0020] Preferably, the first semicircular tube and the second semicircular tube are made of stainless steel.

[0021] Preferably, the first semicircular tube and the second semicircular tube of the second heat exchanger clamp are also fixed to the first center support rod by gluing, and the first semicircular tube and the second semicircular tube of the second heat exchanger clamp are provided with a positioning groove and a solid glue groove arranged along the axial direction, the positioning groove is used for installation positioning, and the solid glue groove is used to store the glue amount.

[0022] Preferably, the number of the first heat exchanger clamp ring and the second heat exchanger clamp ring can be set to multiple, and the multiple first heat exchanger clamp rings and the multiple second heat exchanger clamp rings are connected to the first central support rod at intervals; the heat exchangers on the multiple first heat exchanger clamp rings and the multiple second heat exchanger clamp rings have different temperature zones, and the heat exchanger temperature zone gradually decreases along the direction from the first outer Dewar end cover to the second outer Dewar end cover.

[0023] Preferably, the device further comprises a circular clamping ring and a plurality of connecting pieces, wherein the circular clamping ring is sleeved on the liquid nitrogen storage tank, and the connecting pieces are used to connect the circular clamping ring and the outer Dewar body.

[0024] Preferably, the device further comprises two O-rings, and the two O-rings are respectively arranged between the outer Dewar body and the first outer Dewar end cover and the second outer Dewar end cover.

[0025] By applying the technical solution of the present invention, the heat transfer path from the outer Dewar (the outer surface is at room temperature) to the left end of the liquid helium storage tank is extended by the first central support rod not in contact with the liquid helium storage tank; there is a preset gap between the support fin and the second cold shield end cover to prevent thermal short circuit; the second cold shield end cover is connected to the first central support rod through the second flange, and the support fin is also connected to the other end of the first central support rod, so as to fully extend the path to reduce heat leakage, and the first central support rod has a right fulcrum, forming a reliable two-end fixed support structure, which not only reduces heat leakage but also has high vibration resistance; the second central support rod does not contact the liquid nitrogen storage tank, and the heat transfer path from the outer Dewar (the outer surface is at room temperature) to the liquid nitrogen storage tank is extended. The heat insulation support device of the present invention has the advantages of low heat leakage, vibration resistance, and detachability, ensuring that it has low heat leakage and high load-bearing capacity in the liquid helium temperature zone, and improving the refrigeration efficiency of the ultra-low temperature liquid helium temperature zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a heat insulation support device for a cryogenic refrigerator tank of a superconducting maglev train provided according to an embodiment of the present invention is shown;

[0028] Figure 2 Shows Figure 1 Schematic diagram of the structure of the middle supporting fin;

[0029] Figure 3a Shows Figure 1 A front view of the first and second heat exchanger clamps;

[0030] Figure 3b Shows Figure 1 A side view of the first and second heat exchanger clamp rings;

[0031] Figure 3c Shows Figure 1 A front view of the semicircular tubes of the first and second heat exchanger clamps;

[0032] Figure 4 Shows Figure 1 A schematic diagram of the structure of the first central support rod;

[0033] Figure 5 Shows Figure 1 Schematic diagram of the structure of the circular clamp and the connecting parts.

[0034] The above drawings include the following reference numerals:

[0035] 101, outer Dewar body; 102, first outer Dewar end cover; 103, second outer Dewar end cover; 201, cold shield body; 202, first cold shield end cover; 203, second cold shield end cover; 3, first central support rod; 4, liquid helium storage tank; 5, first heat exchanger clamping ring; 501, first semicircular ring; 502, second semicircular ring; 503, first connecting screw; 504, second connecting screw; 505, first fixing part; 506, second fixing part; 507, first semicircular tube; 5071, positioning groove; 5072, solid glue groove; 6, second heat exchanger clamping ring; 7, supporting fin; 8, first flange; 9, second flange; 10, third flange; 11, fourth flange; 12, fifth flange; 13, second central support rod; 14, liquid nitrogen storage tank; 15, circular clamping ring; 16, connecting piece. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0039] like Figure 1 As shown, the present invention provides a heat insulation support device for a low-temperature refrigerator storage tank of a superconducting maglev train, the device comprising an outer dewar and a cold shield arranged in the outer dewar, a first central support rod 3, a liquid helium storage tank 4, a first heat exchanger clamp ring 5, a second heat exchanger clamp ring 6, a support fin 7, a first flange 8, a second flange 9, a third flange 10, a fourth flange 11, a fifth flange 12, a second central support rod 13, and a liquid nitrogen storage tank 14; wherein the outer dewar and the cold shield are both barrel-shaped structures;

[0040] The outer Dewar comprises an outer Dewar body 101, a first outer Dewar end cover 102 and a second outer Dewar end cover 103, one end of the outer Dewar body 101 is sealed and connected to the first outer Dewar end cover 102, and the other end is sealed and connected to the second outer Dewar end cover 103;

[0041] The cold shield comprises a cold shield body 201, a first cold shield end cover 202 and a second cold shield end cover 203, one end of the cold shield body 201 is connected to the first cold shield end cover 202, and the other end is connected to the second cold shield end cover 203;

[0042] One end of the first central support rod 3 is connected to the first outer dewar end cover 102, and the other end passes through the first cold shield end cover 202 and the second cold shield end cover 203 and then extends out of the cold shield; the first cold shield end cover 202 and the first central support rod 3 are connected via the first flange 8; the second cold shield end cover 203 and the first central support rod 3 are connected via the second flange 9;

[0043] The liquid helium storage tank 4 is disposed in the cold shield. The liquid helium storage tank 4 is an annular cavity structure, which is sleeved on the first central support rod 3 and does not contact the first central support rod 3. One end of the liquid helium storage tank 4 close to the first cold shield end cover 202 is connected to the first central support rod 3 through the third flange 10.

[0044] The first heat exchanger clamp ring 5 is connected to the first central support rod 3 and is located between the first outer Dewar end cover 102 and the first cold shield end cover 202. The first heat exchanger clamp ring 5 is used to install the heat exchanger;

[0045] The second heat exchanger clamp ring 6 is arranged in the cold shield and between the first cold shield end cover 202 and the liquid helium storage tank 4; the second heat exchanger clamp ring 6 is connected to the first central support rod 3 for installing the heat exchanger;

[0046] One end of the support fin 7 is connected to the other end of the first central support rod 3 through the second flange 9, and the other end is connected to the inner wall of the outer dewar body 101; there is a preset gap between the support fin 7 and the second cold shield end cover 203;

[0047] One end of the second central support rod 13 is connected to the second outer Dewar end cover 103 via the fourth flange 11;

[0048] The liquid nitrogen storage tank 14 is located between the supporting fins 7 and the second outer Dewar end cover 103. The liquid nitrogen storage tank 14 is an annular cavity structure, which is sleeved on the second central support rod 13 and does not contact the second central support rod 13. One end of the liquid nitrogen storage tank 14 close to the second cold shield end cover 203 is connected to the other end of the second central support rod 13 through the fifth flange 12.

[0049] The present invention extends the heat transfer path from the outer Dewar (outer surface is at room temperature) to the left end of the liquid helium storage tank 4 by not contacting the first central support rod 3 with the liquid helium storage tank 4; a preset gap is provided between the support fin 7 and the second cold shield end cover 203 to prevent thermal short circuit; the second cold shield end cover 203 is connected to the first central support rod 3 by the second flange 9, and the support fin 7 is also connected to the other end of the first central support rod 3, so as to fully extend the path to reduce heat leakage, and make the first central support rod 3 have a right fulcrum, forming a reliable two-end fixed support structure, which not only reduces heat leakage but also has high vibration resistance; the second central support rod 13 does not contact the liquid nitrogen storage tank 14, and extends the heat transfer path from the outer Dewar (outer surface is at room temperature) to the liquid nitrogen storage tank 14. The heat insulation support device of the present invention has the advantages of low heat leakage, vibration resistance, and detachability, ensuring that it has low heat leakage and high load-bearing capacity in the liquid helium temperature zone, and improving the refrigeration efficiency of the ultra-low temperature liquid helium temperature zone.

[0050] According to an embodiment of the present invention, the first flange 8 is made of copper material to improve the cooling efficiency, and the second flange 9, the third flange 10, the fourth flange 11, and the fifth flange 12 are all made of stainless steel plus a layer of glass fiber gasket, and the glass fiber gasket is used to enhance the thermal insulation effect.

[0051] The first central support rod 3 can be made of high-strength and high-modulus carbon fiber reinforced composite material (CFRP) or alumina fiber reinforced composite material (AluminaFRP); CFRP has low thermal conductivity at low temperatures and low cost; AluminaFRP is a low thermal conductivity composite material in the full temperature range (4.5K~300K). The second central support rod 13 can be made of high-strength glass fiber GFRP material or AluminaFRP material, which has low thermal conductivity in the range from room temperature to liquid nitrogen temperature.

[0052] According to an embodiment of the present invention, the supporting fin 7 includes 6 fins that are arranged at equal intervals along the circumferential direction, and the interior of each fin is made of stainless steel material and the exterior is made of glass fiber shell.

[0053] According to an embodiment of the present invention, the first heat exchanger clamp ring 5 and the second heat exchanger clamp ring 6 have the same structure, both of which include a first semicircular tube 507, a second semicircular tube, a first connecting bolt, a second connecting bolt, a first semicircular ring 501, a second semicircular ring 502, a first connecting screw 503, a second connecting screw 504, a first fixing portion 505 and a second fixing portion 506; the first semicircular tube 507 and the second semicircular tube are sleeved on the first central support rod 3, and the first semicircular tube 507 and the second semicircular tube are connected at both ends by the first connecting bolt and the second connecting bolt. Fixed; the first semicircular ring 501 and the second semicircular ring 502 are arranged opposite to each other and are used to surround the heat exchanger. The two ends of the first semicircular ring 501 and the second semicircular ring 502 are fixed by the first connecting screw 503 and the second connecting screw 504. The circumferential fixation of the heat exchanger is achieved by adjusting the connection length of the first connecting screw 503 and the second connecting screw 504; the first fixing portion 505 is used to fix the first semicircular ring 501 with the first semicircular tube 507 and the second semicircular tube; the second fixing portion 506 is used to achieve axial fixation of the heat exchanger.

[0054] In this embodiment, the heat exchanger is embraced by the first semicircular ring 501 and the second semicircular ring 502, which mainly supports the heat exchanger in the gravity direction (vertical direction); in addition, there are two axial clamping rings (second fixing part 506) on the outside, and the position of the axial clamping ring is adjusted to determine the appropriate clamping degree. The clamping ring is connected with screws to embrace the heat exchanger on the left and right sides for easy assembly and clamping; finally, the heat exchanger is clamped both vertically and axially.

[0055] According to an embodiment of the present invention, the first semicircular tube 507 and the second semicircular tube are made of stainless steel.

[0056] According to one embodiment of the present invention, the first semicircular tube 507 and the second semicircular tube of the second heat exchanger clamp 6 are also fixed to the first central support rod 3 by gluing, and the first semicircular tube 507 and the second semicircular tube of the second heat exchanger clamp 6 have a positioning groove 5071 and a solid glue groove 5072 arranged along the axial direction, the positioning groove 5071 is used for installation positioning, and the solid glue groove 5072 is used to store low-temperature glue.

[0057] According to an embodiment of the present invention, the number of the first heat exchanger clamp ring 5 and the second heat exchanger clamp ring 6 can be set to multiple, and the multiple first heat exchanger clamp rings 5 ​​and the multiple second heat exchanger clamp rings 6 are connected to the first central support rod 3 at intervals; the heat exchangers on the multiple first heat exchanger clamp rings 5 ​​and the multiple second heat exchanger clamp rings 6 have different temperature zones, and the temperature zone of the heat exchanger gradually decreases along the direction from the first outer Dewar end cover 102 to the second outer Dewar end cover 103.

[0058] For example, Figure 1 As shown, the number of the first heat exchanger clamp ring 5 is set to 1, and the number of the second heat exchanger clamp ring 6 is set to 2. The heat exchangers installed on the first heat exchanger clamp ring 5 and the two second heat exchanger clamp rings 6 are divided into 1st, 2nd, and 3rd level heat exchangers according to different temperature zones, which are 60K, 12K, and 4.5K from the left end to the right end. Each level of heat exchanger is supported by the heat exchanger clamp ring connected to the CFRP first central support rod 3, and each level considers the thermal insulation support of different temperature zones and different parts.

[0059] In this embodiment, the first semicircular tube 507 and the second semicircular tube of the 2nd and 3rd stage heat exchanger are fixedly connected to the first center support rod 3 by gluing and bolting. A positioning groove 5071 and a solid glue groove 5072 are provided to match the first center support rod 3. The solid glue groove 5072 can fix the glue amount between the semicircular tube and the first center support ring to improve the bonding strength. In this way, space is saved. Since the resin glue is softer, the shrinkage of the first center support rod 3 of CFRP is small at low temperature, and the shrinkage of the metal semicircular tube is large. It can also offset the deformation of the buffer semicircular tube due to cold shrinkage, and prevent the stainless steel semicircular tube from causing excessive compressive stress to the first center support rod 3 after cold shrinkage.

[0060] According to an embodiment of the present invention, the device further comprises a circular retaining ring 15 and a plurality of connecting pieces 16 , wherein the circular retaining ring 15 is sleeved on the liquid nitrogen storage tank 14 , and the connecting pieces 16 are used to connect the circular retaining ring 15 and the outer Dewar body 101 .

[0061] In this embodiment, the liquid nitrogen storage tank 14 is clamped by two circular special-shaped clamping rings to increase the supporting stiffness. The four GFRP insulation screws on the outer circle are in contact with and support the outer Dewar, and are connected to the liquid nitrogen storage tank 14 after passing through a circular arc, forming a certain insulation heat transfer path to reduce heat leakage.

[0062] According to an embodiment of the present invention, the device further comprises two O-rings, which are respectively arranged between the outer Dewar body 101 and the first outer Dewar end cover 102 and the second outer Dewar end cover 103 .

[0063] Since the cold head in the liquid nitrogen temperature zone of the refrigerator has a high refrigeration efficiency, the requirements for reducing heat leakage of the liquid nitrogen storage tank 14 are not so strict. However, it is still considered to use a high-strength and high-modulus GFRP second central support rod 13 to support the liquid nitrogen storage tank 14. Similarly, it does not contact with the liquid nitrogen storage tank 14 to generate heat leakage.

[0064] The entire structure is first assembled with the left side portion of the liquid helium storage tank 4, then assembled with the right side portion of the liquid nitrogen storage tank 14, and finally the end cover portion is encapsulated, which has the performance of being conveniently disassembled and easy to maintain.

[0065] In summary, the present invention provides a heat insulation support device for a cryogenic refrigerator tank of a superconducting maglev train, which has the following beneficial effects:

[0066] 1. The heat from the outer Dewar to the liquid helium storage tank 4 is greatly reduced by the heat insulation support device, and the heat at the left end is resisted and cooled by the heat exchangers at various levels. The heat from the outer Dewar at the right end of the first central support rod 3 is greatly reduced by the support fin 7 (a composite structure of stainless steel + glass fiber shell) and has high toughness. Secondly, the second flange 9 insulated by the glass fiber composite material further reduces heat leakage. At the same time, the second flange 9 is the right fulcrum of the first central support rod 3, rather than forming a cantilever structure, which fully guarantees the stability and vibration resistance of all its supported structures;

[0067] 2. The first and second heat exchanger clamp rings 6 are made of stainless steel, and the connecting screws are made of GFRP composite materials, which can fully transfer the coldness of the heat exchanger to the central support rod, and reduce the heat leakage caused by the temperature difference between the upper and lower parts of the clamp ring through the thermal insulation effect of GFRP;

[0068] 3. A split semicircular connector 16 (first and second semicircular connecting pipes) is added at the connection between the first central support rod 3 and the clamp ring to increase the assemblability; a glass fiber sleeve is added to the leftmost 1st stage heat exchanger to further reduce the heat leakage from room temperature to 60K, and then the split semicircular connector 16 made of stainless steel is fixed by screws for connection with the clamp ring; the split semicircular connector 16 made of stainless steel at the 2nd and 3rd stage heat exchangers is directly bonded to the first central support rod 3 using low-temperature glue, which can facilitate assembly and provide a certain resistance to cold shrinkage deformation;

[0069] 4. All equipment from the liquid helium storage tank 4 to the left end can be assembled first and then installed into the outer Dewar cylinder. Then, the components of the assembled right-side liquid nitrogen storage tank 14 and other equipment are assembled from the right end to the outer Dewar. Finally, the detachable end cover is O-sealed and screwed, so that the entire structure can be disassembled for easy maintenance and testing.

[0070] Parts of the present invention that are not described in detail are well known to those skilled in the art.

[0071] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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.

Claims

1. A heat-insulating support device for a cryogenic refrigerator tank of a superconducting maglev train, characterized in that: The device comprises an outer dewar and a cold shield arranged in the outer dewar, a first central support rod, a liquid helium storage tank, a first heat exchanger clamp ring, a second heat exchanger clamp ring, a support fin, a first flange, a second flange, a third flange, a fourth flange, a fifth flange, a second central support rod, and a liquid nitrogen storage tank; The outer Dewar comprises an outer Dewar body, a first outer Dewar end cap and a second outer Dewar end cap, one end of the outer Dewar body is sealed and connected to the first outer Dewar end cap, and the other end is sealed and connected to the second outer Dewar end cap; The cold shield comprises a cold shield body, a first cold shield end cover and a second cold shield end cover, one end of the cold shield body is connected to the first cold shield end cover, and the other end is connected to the second cold shield end cover; One end of the first central support rod is connected to the first outer dewar end cover, and the other end passes through the first cold shield end cover and the second cold shield end cover and then extends out of the cold shield; the first cold shield end cover and the first central support rod are connected via the first flange; the second cold shield end cover and the first central support rod are connected via the second flange; The liquid helium storage tank is disposed in the cold shield, and the liquid helium storage tank is an annular cavity structure, which is sleeved on the first central support rod and does not contact the first central support rod, and one end of the liquid helium storage tank close to the first cold shield end cover is connected to the first central support rod through the third flange; The first heat exchanger clamping ring is connected to the first central support rod and is located between the first outer Dewar end cover and the first cold shield end cover, and the first heat exchanger clamping ring is used to install the heat exchanger; The second heat exchanger clamp ring is arranged in the cold shield and between the first cold shield end cover and the liquid helium storage tank; the second heat exchanger clamp ring is connected to the first central support rod for installing the heat exchanger; One end of the support fin is connected to the other end of the first central support rod through the second flange, and the other end is connected to the inner wall of the outer dewar body; there is a preset gap between the support fin and the second cold shield end cover; One end of the second central support rod is connected to the second outer Dewar end cover via the fourth flange; The liquid nitrogen storage tank is located between the supporting fins and the second outer Dewar end cover. The liquid nitrogen storage tank is an annular cavity structure, which is sleeved on the second central support rod and does not contact the second central support rod. One end of the liquid nitrogen storage tank close to the second cold shield end cover is connected to the other end of the second central support rod through the fifth flange.

2. The device according to claim 1, characterized in that The material of the first flange is red copper; the material of the second flange, the third flange, the fourth flange, and the fifth flange are all stainless steel plus a layer of glass fiber gasket; the material of the first center support rod is carbon fiber reinforced composite material or alumina fiber reinforced composite material; the material of the second center support rod is glass fiber material or alumina fiber reinforced composite material.

3. The device according to claim 1, characterized in that The supporting fins include 6 fins which are arranged at equal intervals along the circumferential direction. The interior of each fin is made of stainless steel material and the exterior is made of a glass fiber shell.

4. The device according to claim 1, characterized in that The first heat exchanger clamping ring and the second heat exchanger clamping ring have the same structure, and both include a first semicircular tube, a second semicircular tube, a first connecting bolt, a second connecting bolt, a first semicircular ring, a second semicircular ring, a first connecting screw, a second connecting screw, a first fixing portion and a second fixing portion; the first semicircular tube and the second semicircular tube are sleeved on the first central support rod, and the two ends of the first semicircular tube and the second semicircular tube are fixed by the first connecting bolt and the second connecting bolt; the first semicircular ring and the second semicircular ring are arranged opposite to each other and are used to surround the heat exchanger, and the two ends of the first semicircular ring and the second semicircular ring are fixed by the first connecting screw and the second connecting screw, and the circumferential fixation of the heat exchanger is achieved by adjusting the connection length of the first connecting screw and the second connecting screw; the first fixing portion is used to fix the first semicircular ring to the first semicircular tube and the second semicircular tube; the second fixing portion is used to achieve axial fixation of the heat exchanger.

5. The device according to claim 1, characterized in that The first semicircular tube and the second semicircular tube are made of stainless steel.

6. The device according to claim 1, characterized in that The first semicircular tube and the second semicircular tube of the second heat exchanger clamp are also fixed to the first center support rod by gluing. The first semicircular tube and the second semicircular tube of the second heat exchanger clamp are provided with a positioning groove and a solid glue groove arranged along the axial direction. The positioning groove is used for installation positioning, and the solid glue groove is used for storing glue.

7. The device according to claim 1, characterized in that The number of the first heat exchanger clamp ring and the second heat exchanger clamp ring can be set to multiple, and the multiple first heat exchanger clamp rings and the multiple second heat exchanger clamp rings are connected to the first central support rod at intervals; the heat exchangers on the multiple first heat exchanger clamp rings and the multiple second heat exchanger clamp rings have different temperature zones, and the heat exchanger temperature zone gradually decreases along the direction from the first outer Dewar end cover to the second outer Dewar end cover.

8. The device according to claim 1, characterized in that The device also includes a circular clamp ring and a plurality of connecting pieces. The circular clamp ring is sleeved on the liquid nitrogen storage tank, and the connecting pieces are used to connect the circular clamp ring and the outer Dewar body.

9. The device according to claim 1, characterized in that The device also includes two O-type sealing rings, which are respectively arranged between the outer Dewar body and the first outer Dewar end cover and the second outer Dewar end cover.

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