Low-temperature constant-temperature system and low-temperature container

Abstract

The invention relates to a low-temperature constant-temperature system and a low-temperature container. The system comprises a thermostat, a cold supply container and a cold screen coil pipe, a cold shielding layer of the thermostat is arranged in a vacuum cavity between an inner container and an outer tank body of the low-temperature container in a sleeved mode, a cold shield coil pipe is laid on the outer wall of the cold shielding layer, one end of the cold shield coil pipe is communicated with the cold supply container, and the other end of the cold shield coil pipe is communicated with the outside. The cold supply container is of an axial symmetry structure and is arranged at one end of the vacuum chamber between the inner container and the outer tank body; the cold supply container comprises a first seal head, a second seal head and a first shell, the first seal head and the second seal head are connected to the two ends of the first shell respectively, and the convex surfaces of the first seal head and the second seal head face the same direction as the convex surface of the seal head of the outer tank body; one end of the cold shielding layer is connected with a sealing end socket, and the other end is hermetically connected with the straight edge of the first end socket; during working, a cold supply medium in the cold supply container flows in the cold shield coil pipe, so that the cold shield layer is maintained at a preset temperature. According to the invention, the layout is reasonable, and the maximization of the volume of the inner container can be met while effective cooling is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic containers, and particularly to a cryogenic constant temperature system and a cryogenic container. Background Art

[0002] As an important cold storage device, the heat insulation problem of cryogenic containers is the key to storage and transportation. At present, a cryogenic constant temperature system is mostly used to maintain a certain low-temperature cold environment for cryogenic containers, so as to reduce the heat loss of cryogenic containers and meet the requirements of application scenarios such as cryogenic scientific experiments and cryogenic liquid storage and transportation.

[0003] At present, cryogenic constant temperature systems mostly include cryostats and cold supply containers, etc. Among them, the cold supply container is used to store cold supply media to meet the cold quantity requirements of cryogenic containers during storage and transportation. Usually, both the cryostat and the cold supply container are arranged in the vacuum chamber between the inner container and the outer tank of the cryogenic container. However, due to the limited chamber space in the cryogenic container, when the existing cryogenic constant temperature system increases the cold supply volume of the cold supply container, it also compresses the volume of the inner container and reduces the liquid storage capacity of the inner container.

[0004] Therefore, there is an urgent need to provide a cryogenic constant temperature system and a cryogenic container to solve the above technical problems. Summary of the Invention

[0005] The embodiments of the present invention provide a cryogenic constant temperature system and a cryogenic container, with a reasonable layout, which can maximize the volume of the inner container while ensuring effective cold supply.

[0006] An embodiment of the present invention provides a cryogenic constant temperature system. The cold shield layer of the cryostat is sleeved in the vacuum chamber between the inner container and the outer tank of the cryogenic container. The cold shield coil is laid on the outer wall of the cold shield layer. One end of the cold shield coil is communicated with the cold supply container, and the other end is communicated with the outside.

[0007] The cold supply container is an axisymmetric structure and is arranged at one end of the vacuum chamber between the inner container and the outer tank. The cold supply container includes a first head, a second head, and a first shell. The first head and the second head are respectively connected to both ends of the first shell, and the convex surfaces of the first head and the second head face the same direction as the convex surface of the head of the outer tank. One end of the cold shield layer is connected with a sealing head, and the other end is hermetically connected with the straight edge of the first head.

[0008] During operation, the cold supply medium in the cold supply container flows in the cold shield coil, so that the cold shield layer is maintained at a preset temperature.

[0009] Another embodiment of the present invention provides a cryogenic container, which includes an inner container, an outer tank, and the cryogenic constant temperature system described in the above embodiment.

[0010] An embodiment of the present invention provides a low-temperature constant-temperature system and a low-temperature container. First, by providing a cold shield layer and a cold screen coil, the cold shield layer can be cooled by a cooling medium, so that the cold shield layer has a lower temperature and reduces the heat dissipation loss of the low-temperature container. Secondly, by designing the cooling container into a structure composed of a first head, a second head, and a first shell, and the convex surfaces of the first head and the second head face the same direction as the convex surface of the head of the outer tank, in this way, while ensuring that the cooling container has a large volume, the smallest chamber can be occupied. Specifically, due to the large cooling volume, more cooling medium can be stored, meeting the requirements of the low-temperature container for longer-term lossless storage and transportation. In addition, since the chamber occupied is small under the same volume, a larger inner container can be provided inside the low-temperature container to meet the requirements of the storage capacity of the low-temperature medium. It can be seen that the low-temperature constant-temperature system designed in this application has a reasonable layout, and while ensuring effective cooling, it can meet the maximization of the volume of the inner container. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is a sectional view of the overall structure of the low-temperature constant-temperature system and the low-temperature container provided by an embodiment of the present invention;

[0013] Figure 2 It is a schematic structural diagram of a thermostat and a cooling container provided by an embodiment of the present invention;

[0014] Figure 3 is Figure 1 a schematic diagram of the A-A cross-section in

[0015] Figure 4 is Figure 3 a partial enlarged view at I in

[0016] Figure 5 is Figure 2 a schematic diagram of the B-B cross-section in

[0017] Figure 6 is Figure 5 a partial enlarged view at H in

[0018] Figure 7 is Figure 2 a partial enlarged view at C in

[0019] Figure 8For Figure 2 Partial enlarged view at position D in

[0020] Figure 9 Provided by another embodiment of the present invention Figure 2 Partial structural schematic diagram of the cold shield coil at position C in

[0021] Reference numerals:

[0022] 10 - thermostat

[0023] 101 - cold shield layer

[0024] 20 - cooling container

[0025] 201 - first head; 202 - second head; 203 - first shell; 204 - liquid outlet joint

[0026] 30 - cold shield coil

[0027] 301 - first manifold; 302 - second manifold; 303 - flat tube; 304 - round tube; 305 - liquid outlet pipe; 306 - exhaust pipe; 307 - adapter; 308 - regulating valve

[0028] 40 - inner container

[0029] 50 - outer tank

[0030] 60 - cold conduction copper braid; 61 - copper braid fixing plate

[0031] 70 - sliding support

[0032] 701 - steel - aluminum composite pipe; 702 - fiberglass pipe; 703 - outer sleeve; 704 - sealing plate; 705 - lower ball socket; 706 - lower ball head; 707 - upper ball socket; 708 - upper ball head; 709 - bolt; 710 - limiting plate; 711 - disc spring group; 712 - nut pressing plate; 713 - lock nut

[0033] 80 - support ring

[0034] 90 - axial support Detailed implementation manners

[0035] To make the objectives, 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 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As shown in Figure 1 and Figure 2 FIG. 4, an embodiment of the present invention provides a low-temperature constant temperature system, which includes a thermostat 10, a cooling container 20, and a cold shield coil 30;

[0037] The cold shield layer 101 of the thermostat 10 is sleeved in the vacuum chamber between the inner container 40 and the outer tank 50 of the low-temperature container. The cold shield coil 30 is laid on the outer wall of the cold shield layer 101. One end of the cold shield coil 30 is communicated with the cooling container 20, and the other end is communicated with the outside;

[0038] The cooling container 20 has an axisymmetric structure and is arranged at one end of the vacuum chamber between the inner container 40 and the outer tank 50. The cooling container 20 includes a first head 201, a second head 202, and a first shell 203. The first head 201 and the second head 202 are respectively connected to both ends of the first shell 203, and the convex surfaces of the first head 201 and the second head 202 face the same direction as the convex surface of the head of the outer tank 50. One end of the cold shield layer 101 is connected with a sealing head, and the other end is hermetically connected to the straight edge of the first head 201;

[0039] During operation, the cooling medium in the cooling container 20 flows in the cold shield coil 30 to maintain the cold shield layer 101 at a preset temperature.

[0040] In this embodiment, first, by providing the cold shield layer 101 and the cold shield coil 30, the cold shield layer 101 can be cooled by the cooling medium, so that the cold shield layer 101 has a lower temperature and reduces the heat dissipation loss of the low-temperature container. Secondly, by designing the cooling container 20 into a structure composed of a first head 201, a second head 202, and a first shell 203, and the convex surfaces of the first head 201 and the second head 202 face the same direction as the convex surface of the head of the outer tank 50. In this way, while ensuring that the cooling container 20 has a large volume, the smallest chamber can be occupied. Specifically, due to the large cooling volume, more cooling medium can be stored, meeting the requirements of the low-temperature container for longer-term lossless storage and transportation. In addition, since the chamber occupied is small under the same volume, a larger inner container 40 can be provided in the low-temperature container to meet the requirements of the storage capacity of the low-temperature medium. It can be seen that the layout of the low-temperature constant temperature system designed in the present application is reasonable, and while ensuring effective cooling, the volume of the inner container 40 can be maximized.

[0041] It should be noted that the cryogenic container can be a container for storing cryogenic media such as liquid hydrogen and liquid helium, and the cooling medium in the cooling container 20 can be liquid nitrogen, etc., which is not specifically limited in this application. In addition, one end of the cold shield layer 101 is sealed by an independent head, and the other end shares a head with the cooling container 20, which not only saves materials and space, but also facilitates the heat transfer between the cooling container 20 and the cold shield layer 101. By adopting the cooling container 20 in the above form, the stored cooling medium can meet the requirements of the non-destructive storage time marked on the cryogenic container, and can at least meet the storage requirements of 45 days or more.

[0042] In some embodiments, as Figure 2 , Figures 5 to 8 shown, at least one liquid outlet joint 204 is provided at the bottom end of the cooling container 20, and the cold screen coil 30 includes: at least one liquid outlet pipe 305, a first collecting pipe 301, a second collecting pipe 302, a plurality of flat pipes 303 and an exhaust pipe 306;

[0043] One end of each liquid outlet pipe 305 is respectively connected to a liquid outlet joint 204 of the cooling container 20, and the other end is respectively connected to the first collecting pipe 301; the first collecting pipe 301 is circumferentially wound around one end of the cold shield layer 101 close to the cooling container 20; the second collecting pipe 302 is circumferentially wound around the other end of the cold shield layer 101, one end of the exhaust pipe 306 is connected to the second collecting pipe 302, and the other end passes through the outer tank 50 and communicates with the outside; one end of each flat pipe 303 is respectively communicated with the first collecting pipe 301, the other end is communicated with the second collecting pipe 302, and each flat pipe 303 is circumferentially and equally spaced along the cold shield layer 101, and the long sides of each flat pipe 303 are respectively attached to the outer wall of the cold shield layer 101.

[0044] In this embodiment, since heat exchange efficiency is a key factor in ensuring that the cold shielding layer 101 reaches the required temperature and reduces the loss of cold, the cold shield coil 30, under the premise of meeting the required medium flow rate for heat exchange, must ensure that the contact surface with the cold shielding layer 101 is as large as possible to reduce the contact thermal resistance. In this embodiment, on the one hand, by making the flat tubes 303 equally spaced along the circumference of the cold shielding layer 101, it can not only ensure that the difference in the mass flow of the medium in each flat tube 303 is within the set range, but also fully consider the temperature difference at the farthest end of the flat tube 303 in the circumference, so as to ensure that the temperature of the cold shielding layer 101 is uniform. On the other hand, by using the flat tube 303, the long side of the flat tube 303 can form a surface contact with the outer wall of the cold shielding layer 101, thereby increasing the heat exchange area, improving the heat exchange efficiency, and ensuring that the cold shielding layer 101 reaches the required temperature. In addition, the cross section of the flat tube 303 is preferably a rectangular cross section, and the area of ​​the cross section and the length of each side are determined according to the outer diameter of the cold shielding layer 101 and the required medium flow rate. First, the flow area of ​​the cross section of the flat tube 303 meets the heat exchange requirement. Second, the length of the long side of the flat tube 303 differs from the outer diameter of the cold shielding layer 101 by three orders of magnitude to ensure the fit between the two. In addition, the number of flat tubes 303 can be 6, which can be determined by the user according to the heat exchange requirements, and this application does not make specific restrictions. In addition, in order to further ensure the fit between the flat tube 303 and the cold shielding layer 101, the contacting parts can be welded.

[0045] In some embodiments, the first collecting pipe 301, the second collecting pipe 302, the liquid outlet pipe 305 and the flat pipe 303 are all aluminum alloy pipes, and the material of the cooling container 20 is 300 series stainless steel. Therefore, the liquid outlet joint 204 of each cooling container 20 is provided with a steel-aluminum transition joint to ensure a stable sealing connection between pipes of different materials.

[0046] It should be noted that when two liquid outlet joints 204 are symmetrically arranged at the bottom of the cooling container 20, each liquid outlet pipe 305 can be connected to the liquid outlet joint 204 and led out to form a semi-ring collecting pipe on the cold shielding layer 101. At this time, the flat tube 303 can be connected to each semi-ring collecting pipe. The partial schematic diagram is shown in FIG. Figure 9 Of course, other arrangements can also be used, as long as the plurality of flat tubes 303 are evenly distributed along the cold shielding layer 101 and the difference in the mass flow of the medium in each flat tube 303 is within a set range, and this application does not make any specific restrictions.

[0047] In some embodiments, the cold shield coil 30 further includes: a plurality of round tubes 304 and a plurality of conversion joints 307;

[0048] Both ends of each flat tube 303 are connected to a round tube 304 via a conversion joint 307 , and are connected to the first collecting tube 301 and the second collecting tube 302 via the corresponding round tube 304 .

[0049] In this embodiment, by using the circular tube 304 and the adapter, the connection stability between the flat tube 303 and the manifold can be improved. Of course, the user can also weld the two ends of the flat tube 303 to the corresponding manifolds respectively, as long as the sealing performance can be ensured.

[0050] In addition, a flow regulating valve 308 is provided on the second manifold 302 to regulate the flow rate of the cooling medium.

[0051] In some embodiments, as Figure 8 shown, a plurality of cold-conducting copper braided tapes 60 are laid on the end head of the thermostat 10 away from the cooling container 20, and each cold-conducting copper braided tape 60 is uniformly distributed along the axial direction of the end head;

[0052] One end of each cold-conducting copper braided tape 60 is connected to the center of the top of the end head respectively, and the other end extends to the edge of the end head and is connected to the cold shield layer 101.

[0053] By adopting the above embodiments, the temperature field of the end head of the sliding-end thermostat 10 can be ensured to be uniform. In addition, a copper braided tape fixing plate 61 can also be used to fix the cold-conducting copper braided tapes 60 to improve the stability.

[0054] The inventor also found in the work that in order to ensure the stable connection between the cryostat 10 and the cryogenic container, the support structure of the existing cryogenic temperature control system mostly adopts a multi-layer folded steel sleeve structure, and the wall thickness of the steel sleeve is as thin as possible. Although this support structure can extend the heat leakage path and reduce the heat leakage to a certain extent, due to its long path and thin wall thickness, the structural strength, stiffness and stability will decrease, and the cryogenic container is prone to unstable support during transportation or external force impact.

[0055] Based on this, the inventor improved the support structure of the cryogenic temperature control system in the following way:

[0056] As Figure 2 、 Figure 5 and Figure 6 shown, in some embodiments, the system further includes a plurality of sliding supports 70, which are respectively arranged along the radial direction at one end of the outer tank 50 away from the cooling container 20;

[0057] Each sliding support 70 includes a steel-aluminum composite tube 701, a first hinge, a second hinge, a glass fiber tube 702 and an outer sleeve 703; the steel-aluminum composite tube 701 is composed of an inner lining steel tube and an external aluminum tube;

[0058] One end of the steel-aluminum composite pipe 701 passes through the head of the thermostat 10, and the other end is connected to one end of the first hinge member. The other end of the first hinge member is connected to one end of the fiberglass pipe 702. The other end of the fiberglass pipe is connected to the second hinge member, and the other end of the second hinge member is connected to the outer sleeve 703. One end of the outer sleeve 703 is inserted into the chamber between the outer tank 50 and the thermostat 10, and the other end passes through the outer tank 50 and is provided with a sealing plate 704.

[0059] In this embodiment, by adopting the spherical hinge fiberglass connecting rod structure, while ensuring the connection strength, the axial and radial cold shrinkage amounts can be effectively compensated. The inventor's test on the sliding support 70 shows that the sliding support 70 can not only meet the connection strength requirements at room temperature, but also withstand the influence brought by the axial cold shrinkage amount of at least 10 m of the cold shield layer 101 cylinder and the radial cold shrinkage amount of the rod. In addition, the outer sleeve 703 is closed by the sealing plate 704 to form a closed jacket, so as to communicate with the main vacuum chamber of the cryogenic container and reduce heat leakage.

[0060] In addition, by adopting the fiberglass pipe 702 as the support member, the heat leakage amount can be reduced and the structural strength can be improved. In addition, the material of the fiberglass pipe 702 can be G10 cryogenic fiberglass.

[0061] In some embodiments, both the first hinge member and the second hinge member are spherical hinge structures. The first hinge member includes a lower ball socket 705 and a lower ball head 706, and the second hinge member includes an upper ball socket 707 and an upper ball head 708.

[0062] One end of the inner lining steel pipe away from the axis is connected to the lower ball socket 705. One end of the lower ball head 706 is assembled with the lower ball socket 705, and the other end is connected to one end of the fiberglass pipe 702. The other end of the fiberglass pipe 702 is connected to one end of the upper ball head 708. The other end of the upper ball head 708 is assembled with the upper ball socket 707. One end of the upper ball socket 707 away from the fiberglass pipe 702 is connected to one end of the outer sleeve 703. The outer end center of the upper ball head 708 is connected with a bolt 709. A limiting plate 710 is arranged inside the outer sleeve 703, and the bolt 709 passes through the plate hole on the limiting plate 710. A disc spring group 711 is arranged above the limiting plate 710, a nut pressing plate 712 is arranged above the disc spring group 711, and a locking nut 713 is arranged above the nut pressing plate 712.

[0063] In this embodiment, through the above specific connection method, the support strength requirements can be met, and the support member can effectively absorb the displacement amounts in both the axial and radial directions. In addition, the connection method between the lower ball head 706 and the fiberglass pipe 702, and the connection method between the fiberglass pipe 702 and the upper ball head 708 both adopt low-temperature epoxy resin glue for bonding. Low-temperature epoxy resin glue is also used for bonding.

[0064] In some embodiments, the system further includes a stainless steel support ring 80 disposed at one end of the outer tank 50 close to the cooling container 20; the outer diameter of the support ring 80 is equal to the inner diameter of the cold shield layer 101, one end of the support ring 80 is embedded in the cold shield layer 101 by a preset distance, and the embedded part is detachably connected to the cold shield layer 101; the other end of the support ring 80 is hermetically connected to the straight edge of the first head 201.

[0065] In this embodiment, the support ring 80 and the cold shield layer 101 are connected by bolt locking or riveting. In this way, while ensuring stable connection, it is convenient for later maintenance. In addition, as a connecting member between the cooling container 20 and the cold shield layer 101, the stainless steel support ring 80 can increase the heat transfer between the two, further cooling the thermostat 10.

[0066] In some embodiments, the low-temperature constant temperature system further includes an axial support member 90. One end of the axial support member 90 is hermetically connected to the head of the inner container 40 close to the cooling container 20, and the other end passes through the cooling container 20 and the outer tank 50 and is hermetically connected to the head of the outer tank 50.

[0067] In this embodiment, the cooling container 20 is fixed to the outer tank 50 through the axial support member 90, ensuring the integrity of the cold shield structure and the reliability of the support structure on the fixed end side.

[0068] The embodiment of the present invention also provides a low-temperature container, including an inner container 40, an outer tank 50 and the low-temperature constant temperature system of any one of the above embodiments, which will not be elaborated here.

[0069] 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 actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0070] Finally, it should be noted that the above are only the preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention and are 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 low temperature constant temperature system, characterized in that: It comprises a thermostat (10), a cooling container (20) and a cooling screen coil (30); The cold shielding layer (101) of the thermostat (10) is sleeved in a vacuum chamber between an inner container (40) and an outer tank body (50) of a low-temperature container, the cold shielding coil (30) is laid on the outer wall of the cold shielding layer (101), one end of the cold shielding coil (30) is connected to the cold supply container (20), and the other end is connected to the outside; The cold supply container (20) is an axisymmetric structure, and is arranged at one end of the vacuum chamber between the inner container (40) and the outer tank body (50); the cold supply container (20) comprises a first head (201), a second head (202) and a first shell (203), wherein the first head (201) and the second head (202) are respectively connected to two ends of the first shell (203), and the convex surfaces of the first head (201) and the second head (202) are oriented in the same direction as the convex surface of the head of the outer tank body (50); one end of the cold shielding layer (101) is connected to a sealing head, and the other end is sealed to the straight edge of the first head (201); During operation, the cooling medium in the cooling container (20) flows in the cold shield coil (30) so that the cold shield layer (101) is maintained at a preset temperature.

2. The system according to claim 1, characterized in that At least one liquid outlet joint (204) is provided at the bottom end of the cooling container (20), and the cooling screen coil (30) comprises: at least one liquid outlet pipe (305), a first collecting pipe (301), a second collecting pipe (302), a plurality of flat tubes (303) and an exhaust pipe (306); One end of each of the liquid outlet pipes (305) is respectively connected to a liquid outlet joint (204) of the cooling container (20), and the other end is respectively connected to the first collecting pipe (301); the first collecting pipe (301) surrounds the cold shielding layer (101) along the circumferential direction at one end close to the cooling container (20); the second collecting pipe (302) surrounds the other end of the cold shielding layer (101) along the circumferential direction, one end of the exhaust pipe (306) is connected to the second collecting pipe (302), and the other end passes through the outer tank body (50) to communicate with the outside; one end of each of the flat tubes (303) is respectively connected to the first collecting pipe (301), and the other end is connected to the second collecting pipe (302), and each of the flat tubes (303) is respectively distributed at equal intervals along the circumferential direction of the cold shielding layer (101), and the long side of each of the flat tubes (303) is respectively in contact with the outer wall of the cold shielding layer (101).

3. The system according to claim 2, characterized in that The first collecting pipe (301), the second collecting pipe (302), the liquid outlet pipe (305) and the flat tube (303) are all aluminum alloy pipes, and the cooling container (20) is made of stainless steel; the liquid outlet joint (204) of each cooling container (20) is provided with a steel-aluminum transition joint.

4. The system according to claim 2, characterized in that The cold shield coil (30) further comprises: a plurality of round tubes (304) and a plurality of conversion joints (307); Both ends of each flat tube (303) are connected to a round tube (304) via a conversion joint (307) and are connected to the first collecting tube (301) and the second collecting tube (302) via the corresponding round tube (304).

5. The system according to claim 2, characterized in that A plurality of cooling copper braided belts (60) are provided on the end of the thermostat (10) away from the cooling container (20), and each of the cooling copper braided belts (60) is evenly distributed along the axial direction of the end of the thermostat; One end of each of the cold-conducting copper braided belts (60) is connected to the top center of the end cap, and the other end extends to the edge of the end cap and is connected to the cold shielding layer (101).

6. The system according to claim 2, characterized in that The system further comprises a plurality of sliding support members (70), which are respectively arranged radially at one end of the outer tank body (50) away from the cooling container (20); Each of the sliding support members (70) comprises a steel-aluminum composite pipe (701), a first hinge, a second hinge, a glass fiber reinforced plastic pipe (702) and an outer sleeve (703); the steel-aluminum composite pipe (701) is composed of an inner lining steel pipe and an outer aluminum pipe; One end of the steel-aluminum composite pipe (701) passes through the head of the thermostat (10), and the other end is connected to one end of the first hinge, the other end of the first hinge is connected to one end of the glass fiber reinforced plastic pipe (702), the other end of the glass fiber reinforced plastic is connected to the second hinge, and the other end of the second hinge is connected to the outer sleeve (703); one end of the outer sleeve (703) is inserted into the chamber between the outer tank body (50) and the thermostat (10), and the other end passes through the outer tank body (50) and is provided with a sealing plate (704).

7. The system according to claim 6, characterized in that The first hinged component and the second hinged component are both ball joint structures; the first hinged component includes a lower ball socket (705) and a lower ball head (706), and the second hinged component includes an upper ball socket (707) and an upper ball head (708); The end of the inner lining steel pipe away from the axis is connected to the lower ball socket (705), one end of the lower ball head (706) is assembled with the lower ball socket (705), and the other end is connected to one end of the glass fiber reinforced plastic pipe (702); the other end of the glass fiber reinforced plastic pipe (702) is connected to one end of the upper ball head (708), and the other end of the upper ball head (708) is assembled with the upper ball socket (707), and the end of the upper ball socket (707) away from the glass fiber reinforced plastic pipe (702) is connected to the outer One end of the sleeve (703) is connected; the outer end center of the upper ball head (708) is connected with a bolt (709); a limit plate (710) is provided inside the outer sleeve (703), and the bolt (709) passes through a plate hole on the limit plate (710); a disc spring group (711) is provided above the limit plate (710), a nut pressure plate (712) is provided above the disc spring group (711), and a locking nut (713) is provided above the nut pressure plate (712).

8. The system according to claim 1, characterized in that The system further comprises a support ring (80) which is arranged at one end of the outer tank body (50) close to the cold supply container (20); the outer diameter of the support ring (80) is equal to the inner diameter of the cold shielding layer (101); one end of the support ring (80) is embedded in the cold shielding layer (101) by a preset distance, and the embedded part is detachably connected to the cold shielding layer (101); the other end of the support ring (80) is sealed to the straight edge of the first head (201).

9. The system according to claim 1, characterized in that The system further comprises an axial support member (90), one end of which is sealingly connected to a head of the inner container (40) at one end close to the cooling container (20), and the other end of which is sealingly connected to the head of the outer tank body (50) after passing through the cooling container (20) and the outer tank body (50).

10. A cryogenic container, characterized in that: include: An inner container (40), an outer tank body (50), and a low-temperature constant temperature system as claimed in any one of claims 1 to 9.

Images