Supporting device and low-temperature container

Abstract

The invention relates to a supporting device and a low-temperature container. The supporting device is used for supporting an inner barrel and an outer barrel of the low-temperature container and comprises a plurality of fixed supporting assemblies and a plurality of sliding supporting assemblies. Each fixed supporting assembly comprises a first supporting pipe, a first lengthening pipe, a first supporting seat and a first supporting cover; a plurality of first through holes are formed in a shell of the inner barrel, and a plurality of second through holes in one-to-one correspondence with the first through holes are formed in a shell of the outer barrel; one end of the first extension tube penetrates through one first through hole to enter the inner cylinder, and the other end is hermetically connected with the inner cylinder; the side wall of the first supporting base is fixedly connected with the inner wall face of the end, away from the outer barrel, of the first lengthening pipe. One end of the first supporting pipe is fixedly connected with the end face, close to the outer cylinder, of the first supporting seat, and the other end penetrates out of the corresponding second through hole and is connected with the inner wall of the top face of the first supporting cover; the side walls of the first supporting covers are inserted into the corresponding second through holes, the outer wall faces of the first supporting covers are connected with the outer cylinder in a sealed mode, and the inner wall faces of the first supporting covers do not make contact with the wall faces of the first supporting pipes. According to the application, heat leakage of the low-temperature container can be reduced, and economic loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic containers, and in particular to a supporting device and a cryogenic container. Background Art

[0002] The key to storage and transportation of cryogenic liquids (such as liquid hydrogen) is to keep them cold. At present, in order to avoid and reduce the evaporation loss of cryogenic liquids during storage and transportation, low-temperature horizontal containers usually adopt a double-wall structure, that is, composed of an inner cylinder and an outer cylinder that are arranged in sequence, with a vacuum interlayer between the inner cylinder and the outer cylinder, and a support structure is set in the vacuum interlayer.

[0003] However, due to the limited size of the interlayer of the cryogenic container, the supporting structure used in the related technology has a short heat conduction path, resulting in large heat leakage of the cryogenic liquid, causing serious economic losses.

[0004] Therefore, there is an urgent need to provide a support device and a low-temperature container to solve the above technical problems. Summary of the invention

[0005] The embodiments of the present invention provide a supporting device and a cryogenic container, which can reduce heat leakage of the cryogenic container and reduce economic losses.

[0006] An embodiment of the present invention provides a support device for supporting an inner cylinder and an outer cylinder of a cryogenic container, the support device comprising: a plurality of fixed support assemblies and a plurality of sliding support assemblies; each of the fixed support assemblies is respectively arranged in a vacuum interlayer at one end of the cryogenic container, each of the sliding support assemblies is respectively arranged at the other end of the cryogenic container, each of the sliding support assemblies is respectively used to support the inner cylinder and the outer cylinder, and the inner cylinder can slide along the axial direction of the cryogenic container;

[0007] Each of the fixed support assemblies comprises: a first support tube, a first extension tube, a first support seat and a first support cover;

[0008] The shell of the inner cylinder is provided with a plurality of first through holes, and the shell of the outer cylinder is provided with a plurality of second through holes corresponding to each of the first through holes; one end of the first extension tube passes through one of the first through holes to enter the inner cylinder, and the other end is sealedly connected to the inner cylinder; the side wall of the first support seat is fixedly connected to the inner wall surface of the end of the first extension tube away from the outer cylinder; one end of the first support tube is fixedly connected to the end surface of the first support seat close to the outer cylinder, and the other end passes through the corresponding second through hole and is connected to the inner wall of the top surface of the first support cover; the side wall of the first support cover is inserted into the corresponding second through hole, and the outer wall surface of the first support cover is sealedly connected to the outer cylinder, and the inner wall surface does not contact the wall surface of the first support tube.

[0009] Another embodiment of the present invention provides a low-temperature container, comprising the supporting device described in the above embodiment.

[0010] The embodiment of the present invention provides a support device and a cryogenic container. First, for each fixed support assembly, by inserting a first extension tube into the inner cylinder, the distance between the inner cylinder and the outer cylinder can be extended, thereby extending the length of the first support tube, and further extending the heat transfer path of the cryogenic medium. Secondly, by setting a first support cover, the outer wall surface of the first support cover is sealed and connected to the outer cylinder, and the inner wall surface does not contact the wall surface of the first support tube. Therefore, after the heat flow reaches the top of the first support cover, it needs to be transferred to its side wall until it reaches the connection between the side wall and the outer cylinder, thereby further extending the heat transfer path of the cryogenic medium. It can be seen that the present application can greatly extend the heat transfer path of the heat flow, reduce heat leakage, and reduce economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A three-dimensional schematic diagram of a supporting device provided in one embodiment of the present invention;

[0013] Figure 2 for Figure 1 Schematic diagram of the middle AA section;

[0014] Figure 3 for Figure 2 A partial enlarged view of point I in the middle;

[0015] Figure 4 for Figure 1 Schematic diagram of the middle BB section;

[0016] Figure 5 for Figure 1 A partial enlarged view of the J in the middle;

[0017] Figure 6 A three-dimensional schematic diagram of a sliding support assembly provided in another embodiment of the present invention;

[0018] Figure 7 for Figure 6 Schematic diagram of the CC section;

[0019] Figure 8 for Figure 6 A cross-sectional schematic diagram of the sliding support assembly;

[0020] Fig. 9 for Figure 3 A partial enlarged view of point H in the middle.

[0021] Reference numerals:

[0022] 10-Inner cylinder;

[0023] 20-Outer cylinder;

[0024] 30-Fixed support assembly;

[0025] 301-first support tube; 302-first extension tube; 303-first support seat; 304-first support cover; 305-second support cover; 306-first pad; 307-second pad; 308-first head;

[0026] 40-sliding support assembly;

[0027] 401-second support tube; 402-second extension tube; 403-second support seat; 404-third support cover; 405-fourth support cover; 406-third pad; 407-fourth pad; 408-second end cap; 409-housing; 410-first inner tube; 411-second inner tube;

[0028] 412-first connection component;

[0029] 4121-first support; 4122-first pin shaft; 4123-first connecting rod support;

[0030] 413-second connection component;

[0031] 4131-second connecting rod support; 4132-second pin shaft; 4133-third connecting rod support;

[0032] 414-third connection component;

[0033] 4141- fourth connecting rod support; 4142- force bearing circular plate; 4143- force relieving circular plate; 4144- fixing ring;

[0034] 5-Extension tube. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] like Figure 1 to Figure 3 As shown, an embodiment of the present invention provides a supporting device for supporting an inner cylinder 10 and an outer cylinder 20 of a cryogenic container, the supporting device comprising: a plurality of fixed supporting assemblies 30 and a plurality of sliding supporting assemblies 40; each fixed supporting assembly 30 is respectively arranged in a vacuum interlayer at one end of the cryogenic container, each sliding supporting assembly 40 is respectively arranged at the other end of the cryogenic container, each sliding supporting assembly 40 is respectively used to support the inner cylinder 10 and the outer cylinder 20, and the inner cylinder 10 can slide along the axial direction of the cryogenic container;

[0037] Each fixed support assembly 30 includes: a first support tube 301, a first extension tube 302, a first support seat 303 and a first support cover 304;

[0038] A plurality of first through holes are provided on the shell of the inner cylinder 10, and a plurality of second through holes corresponding to each of the first through holes are provided on the shell of the outer cylinder 20; one end of the first extension tube 302 passes through a first through hole to enter the inner cylinder 10, and the other end is sealed with the inner cylinder 10; the side wall of the first support seat 303 is fixedly connected to the inner wall surface of the end of the first extension tube 302 away from the outer cylinder 20; one end of the first support tube 301 is fixedly connected to the end surface of the first support seat 303 close to the outer cylinder 20, and the other end passes through the corresponding second through hole and is connected to the inner wall of the top surface of the first support cover 304; the side wall of the first support cover 304 is inserted into the corresponding second through hole, and the outer wall surface of the first support cover 304 is sealed with the outer cylinder 20, and the inner wall surface does not contact the wall surface of the first support tube 301.

[0039] In this embodiment, first, for each fixed support assembly 30, by inserting the first extension tube 302 into the inner cylinder 10, the length of the first support tube 301 can be lengthened, thereby extending the heat transfer path of the cryogenic medium. Secondly, by setting the first support cover 304, the outer wall surface of the first support cover 304 is sealed and connected to the outer cylinder 20, and the inner wall surface does not contact the wall surface of the first support tube 301. Therefore, after the heat flow reaches the top of the first support cover 304, it needs to be transferred to its side wall until it reaches the connection between the side wall and the outer cylinder 20, thereby further extending the heat transfer path of the cryogenic medium. It can be seen that the present application can greatly extend the heat transfer path of the heat flow, reduce heat leakage, and reduce economic losses.

[0040] In addition, in order to ensure that the low-temperature container is supported stably and evenly, multiple fixed support assemblies 30 are evenly distributed along the circumference of the inner cylinder 10. The number of fixed support assemblies 30 is preferably four, and of course the user can also set it according to needs. In addition, the material of the first support tube 301 is preferably a material with high strength and low thermal conductivity such as glass fiber reinforced plastic.

[0041] In some embodiments, Figure 3 and Fig. 9As shown, each fixed support assembly 30 further includes a second support cover 305;

[0042] The second support cover 305 is sleeved on the outside of the first support cover 304, the lower end of the first support cover 304 is fixedly connected to the lower end of the second support cover 305, the outer wall surface of the upper end of the second support cover 305 is sealedly connected to the outer cylinder 20, and except for the fixed connection between the first support cover 304 and the second support cover 305, other areas of the two are not in contact.

[0043] In this step, since the second support cover 305 is provided and there is a gap in the interlayer between the first support cover 304 and the second support cover 305, it is equivalent to adding a folding structure to extend the heat leakage path. Specifically, when the heat reaches the top surface of the first support cover 304, it needs to be transferred from the top surface to the bottom end of its side wall, and then transferred to the side wall of the second support cover 305 through the connection between it and the second support cover 305. The heat is further transferred along the side wall of the second support cover 305 until it reaches the outer cylinder 20. In this way, the heat leakage path can be further extended and the heat leakage loss can be reduced.

[0044] In some embodiments, Figure 3 As shown, each fixed support assembly 30 further includes a first pad 306 and a second pad 307;

[0045] Each first pad 306 is coaxially disposed with a first through hole and fixed to the outer wall of the inner cylinder 10 ; each second pad 307 is coaxially disposed with a second through hole and fixed to the outer wall of the outer cylinder 20 .

[0046] In this embodiment, the strength of the cylinder is reduced due to the through holes formed in the inner cylinder 10 and the outer cylinder 20. In this embodiment, the cylinder can be effectively reinforced by welding the first pad 306 and the second pad 307 around the holes.

[0047] In some embodiments, the cross-section of the first extension tube 302 is circular; each fixed support assembly 30 further includes a first head 308; the open ends of the first head 308 are fixedly connected to the first extension tube 302 and the first support seat 303, respectively.

[0048] In this embodiment, by providing the first sealing head 308 , the stability of the fixed support assembly 30 can be enhanced.

[0049] In some embodiments, Figure 4 and Figure 5 As shown, each sliding support assembly 40 includes: a second support tube 401, a second extension tube 402, a second support seat 403, a third support cover 404 and a fourth support cover 405;

[0050] A plurality of third through holes are provided on the shell of the inner cylinder 10, and a plurality of fourth through holes corresponding to each of the third through holes are provided on the shell of the outer cylinder 20; one end of the second extension tube 402 passes through a third through hole to enter the inner cylinder 10, and the other end is sealed and connected to the inner cylinder 10; the side wall of the second support seat 403 is connected to the inner wall surface of the end of the second extension tube 402 away from the outer cylinder 20; one end of the second support tube 401 is slidably connected to the end surface of the second support seat 403 close to the outer cylinder 20, and the other end passes through the corresponding fourth through hole and is connected to the inner wall of the top surface of the third support cover 404;

[0051] The fourth support cover 405 is sleeved on the outside of the third support cover 404, and the side walls of the fourth support cover 405 and the third support cover 404 are inserted into the corresponding fourth through holes; the lower end of the third support cover 404 is fixedly connected to the lower end of the fourth support cover 405, and the outer wall surface of the upper end of the fourth support cover 405 is sealed and connected to the outer cylinder 20, and except for the fixed connection between the third support cover 404 and the fourth support cover 405, other areas of the two are not in contact.

[0052] In this embodiment, by inserting the second extension tube 402 into the inner cylinder 10, the length of the second support tube 401 can be lengthened, thereby extending the heat transfer path of the low-temperature medium. Secondly, by setting the third support cover 404 and the fourth support cover 405, and there is a gap in the interlayer between the third support cover 404 and the fourth support cover 405, it is equivalent to adding a folding structure to extend the heat leakage path. Specifically, when the heat reaches the top surface of the third support cover 404, it needs to be transferred from the top surface to the bottom end of its side wall, and transferred to the side wall of the fourth support cover 405 through the connection between it and the fourth support cover 405. The heat is further transferred along the side wall of the fourth support cover 405 until it reaches the outer cylinder 20. In this way, the heat leakage path can be further extended, the heat leakage loss can be reduced, and the economic loss can be reduced.

[0053] In addition, in order to ensure that the low-temperature container is supported stably and evenly, multiple sliding support assemblies 40 are evenly distributed along the circumference of the inner cylinder 10. The number of sliding support assemblies 40 is preferably four, and of course the user can also set it according to needs. In addition, the material of the first support tube 301 is preferably a material with high strength and low thermal conductivity such as glass fiber reinforced plastic.

[0054] It should be noted that during the storage and transportation of the cryogenic container, the inner cylinder 10 is affected by the cryogenic medium and will shrink and deform. In this embodiment, the second support tube 401 is slidably connected to the second support seat 403, so that the inner cylinder 10 can move freely along the axial direction, effectively absorbing the shrinkage displacement and ensuring the safety of the equipment.

[0055] In some embodiments, each sliding support assembly 40 further includes a third pad 406 and a fourth pad 407;

[0056] Each third pad 406 is coaxially disposed with a third through hole and fixed to the outer wall of the inner cylinder 10 ; each fourth pad 407 is coaxially disposed with a fourth through hole and fixed to the outer wall of the outer cylinder 20 .

[0057] In this embodiment, the strength of the cylinder is reduced due to the through holes formed in the inner cylinder 10 and the outer cylinder 20. In this embodiment, the cylinder can be effectively reinforced by welding the third pad 406 and the fourth pad 407 around the holes.

[0058] In some embodiments, the cross-section of the second extension tube 402 is circular; each sliding support assembly 40 also includes a second head 408; the open ends of the second head 408 are fixedly connected to the second extension tube 402 and the second support seat 403 respectively.

[0059] In this embodiment, the stability of the fixed support assembly 30 can be enhanced by providing the second seal 408 .

[0060] In the above embodiment, the sliding support assembly 40 and the fixed support assembly 30 are both arranged in the circumferential direction of the cryogenic container. The inventors found in their work that if the sliding support assembly 40 is arranged in the radial direction of the cryogenic container, the heat leakage path can be further extended and heat leakage can be reduced.

[0061] like Figures 6 to 8 As shown, the specific structure of another sliding support assembly 40 is specifically introduced below:

[0062] First, it includes an extension tube 5, one end of which is fixed to an end of the inner cylinder 10 axially away from the fixed support assembly 30, and each sliding support assembly 40 is distributed along the circumference of the extension tube 5;

[0063] Each sliding support assembly 40 includes: an outer shell 409, a first inner tube 410, a second inner tube 411, a first connecting assembly 413412, a second connecting assembly 413 and a third connecting assembly 414;

[0064] One end of the first inner tube 410 is hinged to the side wall of the extension tube 5 through the first connecting component 413412, and the other end is hinged to one end of the second inner tube 411 through the second connecting component 413; the open end of the outer shell 409 passes through the outer cylinder 20 and is sleeved on the outside of the second inner tube 411, and the other end is fixedly connected to the outer cylinder 20; the other end of the second inner tube 411 is connected to the third connecting component 414, and the third connecting component 414 is fixedly connected to the inner wall surface of the outer shell 409, and the first inner tube 410, the second inner tube 411, the first connecting component 413412 and the second connecting component 413 are not in contact with the inner wall of the outer shell 409.

[0065] In this embodiment, first, the sliding support assembly 40 is installed on the side wall of the extension tube 5, so that the sliding support assembly 40 passes through the radial gap between the head of the inner cylinder 10 and the head of the outer cylinder 20. Since the radial space is relatively large, the operating space of the sliding support assembly 40 can be greatly increased, and a longer first inner tube 410 and a second inner tube 411 are used. Secondly, the first inner tube 410 and the second inner tube 411 are connected in sequence, the outer shell 409 is sleeved on the outside of the second inner tube 411, and one end of the second inner tube 411 is connected to the inner wall of the outer shell 409 through the third connecting assembly 414. In this way, during the storage and transportation process, the heat of the low-temperature medium will flow through the extension tube 5, the first connecting assembly 413412, the first inner tube 410, the second connecting assembly 413, the second inner tube 411 and the third connecting assembly 414 in sequence to reach the outer shell 409, and then be transferred from the outer shell 409 to the outer cylinder 20, thereby greatly increasing the heat leakage path, reducing heat leakage, and reducing economic losses.

[0066] It should be noted that multiple sliding support assemblies 40 are evenly distributed along the circumference of the extension tube 5, preferably two, respectively connected to the upper half of the extension tube 5. Of course, both the upper and lower parts can also be set, and this application does not make specific limitations.

[0067] It should be noted that during the storage and transportation of the cryogenic container, the inner cylinder 10 is affected by the cryogenic medium and will shrink and deform. Since the sliding support assembly 40 is arranged on the end cap of the inner cylinder 10, it is far away from the fixed point at the other end. Therefore, the shrinkage displacement from the fixed end to the sliding end is large, resulting in a large pulling force on the sliding support assembly 40, which poses a safety risk.

[0068] In order to solve the above problems, the inventor proposes that the first connecting component 413412 and the second connecting component 413 can be connected by a pin shaft, and the shrinkage displacement can be effectively absorbed through the movable connection.

[0069] The specific structures of the first connecting component 413412 and the second connecting component 413 adopt the following scheme:

[0070] 1. The first connecting assembly 413412 includes: a first support 4121, a first pin shaft 4122 and a first connecting rod support 4123;

[0071] A cylindrical boss is disposed at one end of the first connecting rod support 4123, and two parallel-arranged support ears are disposed at the other end. A first pin hole matching the first pin shaft 4122 is disposed on the first support 4121 and each support ear respectively.

[0072] One end of the first support 4121 is connected to the side wall of the extension tube 5, and the other end is inserted between the two support ears of the first connecting rod support 4123. The first pin shaft 4122 passes through the first support 4121 and the first pin hole of each support ear in turn; the cylindrical boss of the first connecting rod support 4123 is inserted into one end of the first inner tube 410 and sealed therewith.

[0073] 2. The second connecting assembly 413 includes: a second pin shaft 4132, a second connecting rod support 4131 and a third connecting rod support 4133;

[0074] A cylindrical boss is provided at one end of the second connecting rod support 4131, and two parallel supporting ears are provided at the other end; a cylindrical boss is provided at one end of the third connecting rod support 4133, and one supporting ear is provided at the other end; each supporting ear is provided with a second pin hole matching the second pin shaft 4132;

[0075] The cylindrical boss of the second connecting rod support 4131 is inserted into the other end of the first inner tube 410 and is sealed therewith; the cylindrical boss of the third connecting rod support 4133 is inserted into one end of the second inner tube 411 and is sealed therewith; the support ear of the third connecting rod support 4133 is inserted between the two support ears of the second connecting rod support 4131, and the second pin shaft 4132 passes through the second pin hole of each support ear in turn.

[0076] In the above embodiment, the first connecting component 413412 and the second connecting component 413 are connected by a pin shaft. When the inner cylinder 10 is subjected to impact force and cold shrinkage, the displacement caused by the axial force will be automatically absorbed, so that the overall structural stress is reduced and the structure is more stable.

[0077] In some embodiments, the third connecting assembly 414 includes a fourth connecting rod support 4141, a force-bearing circular plate 4142, a force-relief circular plate 4143, and a fixing ring 4144, which are coaxially arranged in sequence; the outer diameter of the force-bearing circular plate 4142 is equal to the inner diameter of the housing 409, and the side wall of the force-bearing circular plate 4142 is sealed and connected to the inner wall surface of the housing 409;

[0078] A cylindrical boss is provided at one end of the fourth connecting rod support 4141, and a round rod is provided at the other end. The cylindrical boss is inserted into an end of the second inner tube 411 away from the first inner tube 410 and is sealed and connected thereto.

[0079] The centers of the force-bearing circular plate 4142 and the force-relieving circular plate 4143 are respectively provided with round holes matching the round rods. The round rods respectively pass through the round holes on the force-bearing circular plate 4142 and the force-relieving circular plate 4143, and the force-relieving circular plate 4143 is fastened to the force-bearing circular plate 4142 by the fixing ring 4144.

[0080] In this embodiment, by adopting the above connection method, the outer shell 409 can be tightly connected with the second inner tube 411 and the outer cylinder 20, thereby playing an effective supporting role.

[0081] An embodiment of the present invention further provides a low-temperature container, comprising the supporting device described in any of the above embodiments, which will not be described in detail here.

[0082] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the existence of other identical factors in the process, method, article or equipment including the elements.

[0083] Finally, it should be noted that the above is only a preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A supporting device, characterized in that: The support device is used for supporting an inner cylinder (10) and an outer cylinder (20) of a cryogenic container, the support device comprising: a plurality of fixed support assemblies (30) and a plurality of sliding support assemblies (40); each of the fixed support assemblies (30) is respectively arranged in a vacuum interlayer at one end of the cryogenic container, each of the sliding support assemblies (40) is respectively arranged at the other end of the cryogenic container, each of the sliding support assemblies (40) is respectively used for supporting the inner cylinder (10) and the outer cylinder (20), and the inner cylinder (10) can slide along the axial direction of the cryogenic container; Each of the fixed support assemblies (30) comprises: a first support tube (301), a first extension tube (302), a first support seat (303) and a first support cover (304); The shell of the inner cylinder (10) is provided with a plurality of first through holes, and the shell of the outer cylinder (20) is provided with a plurality of second through holes corresponding to each of the first through holes; one end of the first extension tube (302) passes through one of the first through holes and enters the inner cylinder (10), and the other end is sealedly connected to the inner cylinder (10); the side wall of the first support seat (303) is fixedly connected to the inner wall surface of the end of the first extension tube (302) away from the outer cylinder (20); one end of the first support tube (301) is fixedly connected to the end surface of the first support seat (303) close to the outer cylinder (20), and the other end passes through the corresponding second through hole and is connected to the inner wall of the top surface of the first support cover (304); the side wall of the first support cover (304) is inserted into the corresponding second through hole, and the outer wall surface of the first support cover (304) is sealedly connected to the outer cylinder (20), and the inner wall surface does not contact the wall surface of the first support tube (301).

2. The support device according to claim 1, characterized in that: Each of the fixed support assemblies (30) further comprises a second support cover (305); The second support cover (305) is sleeved on the outside of the first support cover (304), the lower end of the first support cover (304) is fixedly connected to the lower end of the second support cover (305), the outer wall surface of the upper end of the second support cover (305) is sealedly connected to the outer cylinder (20), and except for the fixed connection between the first support cover (304) and the second support cover (305), other areas of the two are not in contact.

3. The supporting device according to claim 2, characterized in that: Each of the fixed support assemblies (30) further comprises a first pad (306) and a second pad (307); Each of the first pads (306) is coaxially arranged with one of the first through holes and fixed on the outer wall of the inner cylinder (10); each of the second pads (307) is coaxially arranged with one of the second through holes and fixed on the outer wall of the outer cylinder (20).

4. The supporting device according to claim 1, characterized in that: The cross section of the first extension tube (302) is circular; each of the fixed support assemblies (30) further comprises a first end cap (308); the opening end of the first end cap (308) is respectively fixedly connected to the first extension tube (302) and the first support seat (303).

5. The supporting device according to claim 1, characterized in that: Each of the sliding support assemblies (40) comprises: a second support tube (401), a second extension tube (402), a second support seat (403), a third support cover (404) and a fourth support cover (405); The shell of the inner cylinder (10) is provided with a plurality of third through holes, and the shell of the outer cylinder (20) is provided with a plurality of fourth through holes corresponding to each of the third through holes; one end of the second extension tube (402) passes through one of the third through holes and enters the inner cylinder (10), and the other end is sealedly connected to the inner cylinder (10); the side wall of the second support seat (403) is connected to the inner wall surface of the end of the second extension tube (402) away from the outer cylinder (20); one end of the second support tube (401) is slidably connected to the end surface of the second support seat (403) close to the outer cylinder (20), and the other end passes through the corresponding fourth through hole and is connected to the inner wall of the top surface of the third support cover (404); The fourth support cover (405) is sleeved on the outside of the third support cover (404), and the side walls of the fourth support cover (405) and the third support cover (404) are both inserted into the corresponding fourth through holes; the lower end of the third support cover (404) is fixedly connected to the lower end of the fourth support cover (405), the outer wall surface of the upper end of the fourth support cover (405) is sealedly connected to the outer cylinder (20), and except for the fixed connection between the third support cover (404) and the fourth support cover (405), other areas of the two are not in contact.

6. The supporting device according to claim 5, characterized in that: Each of the sliding support assemblies (40) further comprises a third pad (406) and a fourth pad (407); Each of the third pads (406) is coaxially arranged with one of the third through holes and fixed on the outer wall of the inner cylinder (10); each of the fourth pads (407) is coaxially arranged with one of the fourth through holes and fixed on the outer wall of the outer cylinder (20).

7. The supporting device according to claim 5, characterized in that: The cross-section of the second extension tube (402) is circular; each of the sliding support assemblies (40) further comprises a second end cap (408); the opening end of the second end cap (408) is respectively fixedly connected to the second extension tube (402) and the second support seat (403).

8. The supporting device according to claim 1, characterized in that: It also includes an extension tube (5), one end of which is fixed to an end of the inner cylinder (10) axially away from the fixed support assembly (30), and each of the sliding support assemblies (40) is respectively distributed along the circumference of the extension tube (5); Each of the sliding support assemblies (40) comprises: an outer shell (409), a first inner tube (410), a second inner tube (411), a first connecting assembly (413) (412), a second connecting assembly (413) and a third connecting assembly (414); One end of the first inner tube (410) is hinged to the side wall of the extension tube (5) through the first connecting component (413) (412), and the other end is hinged to one end of the second inner tube (411) through the second connecting component (413); the open end of the outer shell (409) passes through the outer cylinder (20) and is sleeved on the outside of the second inner tube (411), and the other end is fixedly connected to the outer cylinder (20); the other end of the second inner tube (411) is connected to the third connecting component (414), and the third connecting component (414) is fixedly connected to the inner wall of the outer shell (409), and the first inner tube (410), the second inner tube (411), the first connecting component (413) (412) and the second connecting component (413) are not in contact with the inner wall of the outer shell (409).

9. The supporting device according to claim 8, characterized in that: The third connecting assembly (414) comprises a fourth connecting rod support (4141), a force-bearing circular plate (4142), a force-relieving circular plate (4143) and a fixing ring (4144) which are coaxially arranged in sequence; the outer diameter of the force-bearing circular plate (4142) is equal to the inner diameter of the outer shell (409), and the side wall of the force-bearing circular plate (4142) is sealedly connected to the inner wall surface of the outer shell (409); One end of the fourth connecting rod support (4141) is provided with a cylindrical boss, and the other end is provided with a round rod, and the cylindrical boss is inserted into an end of the second inner tube (411) away from the first inner tube (410) and is sealedly connected thereto; The centers of the force-bearing circular plate (4142) and the force-relief circular plate (4143) are respectively provided with circular holes matching the round rods. The round rods respectively pass through the circular holes on the force-bearing circular plate (4142) and the force-relief circular plate (4143), and the force-relief circular plate (4143) is fastened to the force-bearing circular plate (4142) by the fixing ring (4144).

10. A cryogenic container, characterized in that: The invention comprises the supporting device according to any one of claims 1 to 9.

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