Inner and outer container connection device for cryogenic storage tank and cryogenic storage tank

Abstract

The present invention discloses an internal and external container connecting device for a cryogenic storage tank and a cryogenic storage tank. The internal and external container connecting device for a cryogenic storage tank includes a hanging belt, a first connecting assembly, and a second connecting assembly, the first connecting assembly is for connecting the external container, the first connecting assembly includes a first connecting seat and a first connecting member, the first connecting seat is for connecting the external container, and a first position limiting engagement seat is provided on the first connecting seat, the first connecting member is rotatably connected to one end of the hanging belt, and a first position limiting part is provided on the first connecting member, the first position limiting part is fitted and housed in the first position limiting engagement seat, and restricts the first connecting member from twisting on the first connecting seat with the hanging belt as a rotation axis, and the second connecting assembly is for connecting the inner container, and the second connecting assembly is rotatably connected to the other end of the hanging belt. The present application can effectively prevent the hanging belt from twisting and breaking, and improve the reliability of the internal and external container connecting device.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with an application number of 2022112993626 and an application title of "Inner and Outer Container Connection Device of Cryogenic Storage Tank and Cryogenic Storage Tank", which was filed with the Chinese Patent Office on October 21, 2022, and the entire content of which is incorporated herein by reference.

[0002] This application relates to the technical field of cryogenic storage tanks, and particularly to an inner and outer container connection device of a cryogenic storage tank and a cryogenic storage tank.

Background Art

[0003] A cryogenic storage tank is a facility for storing and transporting cryogenic media. Industrially stored and transported liquefied gases include liquefied natural gas, liquid oxygen, liquid nitrogen, liquid hydrogen, liquid helium, and liquefied argon, etc.

[0004] A cryogenic storage tank usually includes a double structure consisting of an inner container and an outer container. A vacuum space is formed between the inner container and the outer container, and the inner container is connected and supported in the outer container by an inner and outer container connection device.

[0005] In related technologies, the inner container is connected and supported in the outer container by installing a plurality of suspension belts. One end of the suspension belt is fixed to the inner container, and the other end is connected to the outer container. During the process of assembling and tightening the suspension belt, the suspension belt is prone to twisting and breaking, resulting in the loss of the connection and support function and low reliability.

[0006] Therefore, there is still room for improvement in the prior art.

Summary of the Invention

Problems to be Solved by the Invention

[0007] This application provides a highly reliable inner and outer container connection device of a cryogenic storage tank and a cryogenic storage tank.

Means for Solving the Problems

[0008] In the first aspect, the embodiment of the present application provides an inner and outer container connection device for a cryogenic storage tank. The cryogenic storage tank includes an inner container and an outer container. The outer container covers the inner container. The inner and outer container connection device is for connecting the inner container and the outer container, and the inner and outer container connection device includes a suspension belt, a first connection assembly, and a second connection assembly. The first connection assembly is for connecting the outer container. The first connection assembly includes a first connection seat and a first connection member. The first connection seat is for connecting the outer container, and a first position limiting engagement seat is provided on the first connection seat. The first connection member is rotatably connected to one end of the suspension belt, and a first position limiting portion is provided on the first connection member. The first position limiting portion is fitted and accommodated in the first position limiting engagement seat to limit the first connection member from twisting around the suspension belt as a rotation axis and connecting to the first connection seat.

[0009] The second connection assembly is for connecting the inner container, and the second connection assembly is rotatably connected to the other end of the suspension belt.

[0010] In the inner and outer container connection device, a position limiting guide groove for fitting with the first position limiting portion is provided in the first position limiting engagement seat, and an adjustment structure is provided on the first connection member. The adjustment structure moves the first position limiting portion along the position limiting guide groove to adjust the distance between the first connection member and the second connection assembly.

[0011] In the inner and outer container connection device, the adjustment structure includes an adjustment nut and an adjustment screw protruding from the first connection member. The adjustment screw is provided with a position limiting guide groove, and when the adjustment screw is fitted with the adjustment nut, the adjustment screw can move the first position limiting portion along the position limiting guide groove so as to adjust the distance between the first connection member and the second connection assembly.

[0012] In the inner and outer container connection device, a locking protrusion protrudes in the first position limiting engagement seat, a locking stage is provided on the first connection member, and when the distance between the first connection member and the second connection assembly is adjusted to the maximum, the locking stage abuts against the locking protrusion.

[0013] In the inner and outer container connection device, a first through hole is provided on the first connection member, a plurality of second through holes are provided on the first connection seat, the alignment of the second through holes at positions different from the first through hole on the first connection member is adjusted, the first through hole and the second through hole are drilled with screws to fix the first connection member, and the distance between the first connection member and the second connection assembly is adjusted.

[0014] In the inner and outer container connection device, the suspension belt is annular, the first connection assembly further includes a first pin shaft, the first pin shaft penetrates the first connection member, the second connection assembly includes a second connection member and a second pin shaft, the second connection member is fixedly connected to the inner container, the second pin shaft penetrates the second connection member and is provided parallel to the first pin shaft, and both ends of the suspension belt are inserted onto the first pin shaft and the second pin shaft respectively and can rotate around the first pin shaft and the second pin shaft.

[0015] In the inner and outer container connection device, the first connection assembly further includes a first bushing, the second connection assembly further includes a second bushing, one end of the suspension belt is inserted onto the first pin shaft by the first bushing, and the other end of the suspension belt is inserted onto the second pin shaft by the second bushing.

[0016] In some embodiments of the present application, a first stopper portion and a second stopper portion are provided on the first bushing. The first stopper portion and the second stopper portion are distributed and installed at intervals in the axial direction of the first pin shaft. One end of the suspension belt is inserted between the first stopper portion and the second stopper portion. A third stopper portion and a fourth stopper portion are provided on the second bushing. The third stopper portion and the fourth stopper portion are distributed and installed at intervals in the axial direction of the second pin shaft. The other end of the suspension belt is inserted between the third stopper portion and the fourth stopper portion.

[0017] In the inner and outer container connection device, the second connection assembly further includes a second connection seat. A second position-limiting engagement seat is provided on the second connection seat. A second position-limiting portion is provided on the second connection member. The second position-limiting portion is fitted and accommodated in the second position-limiting engagement seat to limit the second connection member from twisting onto the second connection seat with the suspension belt as the rotation axis. The second connection member is connected to the inner container by the second connection seat.

[0018] In the inner and outer container connection device, the suspension belt is made of carbon fiber, and the material of the suspension belt is a fiber-reinforced resin composite material.

[0019] In the inner and outer container connection device, the fiber in the fiber-reinforced resin composite material is carbon fiber, aramid fiber or glass fiber.

[0020] The resin in the fiber-reinforced resin composite material is epoxy resin, polyamide resin or high-density polyethylene resin.

[0021] In a second aspect, the present application provides a cryogenic storage tank, including an inner container, an outer container, and an inner and outer container connection device of the cryogenic storage tank according to any one of the above, wherein the outer container covers the inner container, and the inner and outer container connection device connects the inner container and the outer container respectively. A plurality of the inner and outer container connection devices are provided at an end of the inner container, are distributed at intervals in the circumferential direction of the inner container, and at least two of the inner and outer container connection devices are provided above the lateral axis plane of the inner container.

Advantages of the Invention

[0022] Compared with the prior art, the present application provides an inner and outer container connection device. The first connection assembly of the inner and outer container connection device is connected to the outer container, the second connection assembly is connected to the inner container, one end of the suspension belt is rotatably connected to the first connection member of the first connection assembly, the other end is rotatably connected to the second connection assembly, and the first position limiting portion on the first connection member fits and is accommodated in the first position limiting engagement seat of the first connection seat to limit the position of the first connection member and prevent the first connection member from twisting on the first connection seat with the suspension belt as the rotation axis, thereby preventing the suspension belt from twisting and breaking and improving the reliability of the inner and outer container connection device and its cryogenic storage tank. In addition, both ends of the suspension belt are rotatably connected to the first connection assembly and the second connection assembly respectively. When the inner container is displaced due to thermal expansion and contraction, the suspension belt is rotatable relative to the first connection assembly and the second connection assembly, reducing the acting force on the suspension belt due to the displacement of the inner container, effectively preventing the suspension belt from breaking, and improving the reliability of the inner and outer container connection device and the cryogenic storage tank.

Brief Description of the Drawings

[0023]

Figure 1

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Mode for Carrying Out the Invention

[0024] This application provides an inner and outer container connection device for a low-temperature storage tank and a low-temperature storage tank. In order to make the object, technical solution and effect of this application clearer, the following will further describe this application in detail with reference to the drawings and by way of examples. It should be understood that the specific examples described here are only for the purpose of explaining this application and do not limit this application.

[0025] The cryogenic storage tank is a facility for storing and transporting cryogenic media. Referring to FIGS. 1 and 2, the cryogenic storage tank includes an inner container 100, an outer container 200, and a plurality of inner and outer container connection devices 300. The inner container 100 is for storing cryogenic media. The outer container 200 covers the inner container 100, and a vacuum space is formed between the inner container 100 and the outer container 200. The inner and outer container connection devices 300 are for connecting the inner container 100 and the outer container 200. The plurality of inner and outer container connection devices 300 are provided at the end of the inner container 100, are distributed at intervals along the circumferential direction of the inner container 100, and at least two inner and outer container connection devices 300 are provided on the upper side of the lateral axis plane of the inner container 100. The inner and outer container connection devices 300 connect and support the inner container 100 in the outer container 200. The lateral axis plane of the inner container 100 is a horizontal plane passing through the axis of the inner container 100, for example, the plane S in FIG. 2.

[0026] Referring to FIGS. 2 to 4, the inner and outer container connection device 300 of the cryogenic storage tank includes a suspension belt 10, a first connection assembly 20, and a second connection assembly 30. One end of the suspension belt 10 is rotatably connected to the first connection assembly 20, and the other end is rotatably connected to the second connection assembly 30. When the inner container 100 is displaced due to thermal expansion and contraction, the rotatably connected suspension belt 10 can disperse and reduce the tensile force on the suspension belt 10 caused by the displacement of the inner container 100, and can reduce the possibility of damage to the suspension belt 10.

[0027] The material of the suspension belt 10 is a fiber-reinforced resin composite. The fiber in the fiber-reinforced resin composite may be carbon fiber, aramid fiber, or glass fiber. The resin may be epoxy resin, polyamide resin, or high-density polyethylene resin. Since the thermal conductivity of the fiber-reinforced resin composite is low, the suspension belt 10 has a low thermal conductivity, and is low-temperature resistant, fatigue-resistant, and highly reliable.

[0028] The cryogenic medium stored in the cryogenic storage tank is generally at -196°C or higher for liquid nitrogen, but the ultra-low temperature medium temperature is -253°C or lower. Here, liquid hydrogen and liquid helium media have the characteristics of low boiling point, low density, and small latent heat of vaporization, and the requirements for the heat preservation of the container are becoming even more stringent. Taking a container with the same structure as an example, the standard heat leakage amount for storing liquid hydrogen is 1.16 times that of liquid nitrogen, and the static evaporation rate is 5.87 times that of liquid nitrogen. The heat leakage of the heat preservation of the cryogenic storage tank mainly has three aspects: the support heat leakage of the inner and outer containers 200, the heat leakage of the heat insulation, and the heat leakage of the pipe. The suspension belt 10 in the present application adopts a fiber-reinforced resin composite material, has a low thermal conductivity, can effectively reduce the support heat leakage of the inner and outer container connection device 300, and can improve the heat insulation performance of the cryogenic storage tank.

[0029] Referring to FIGS. 2 to 4, the first connection assembly 20 is connected to the outer container 200. The first connection assembly 20 includes a first connection seat 21 and a first connection member 22. The first connection seat 21 is connected to the outer container 200. A first position-limiting engagement seat 211 is provided on the first connection seat 21. The first connection member 22 is rotatably connected to one end of the suspension belt 10. A first position-limiting portion 221 is provided on the first connection member 22. The first position-limiting portion 221 is fitted and accommodated in the first position-limiting engagement seat 211. By limiting the position of the first connection member 22 within the first position-limiting engagement seat 211, the first connection member 22 is restricted from twisting on the first connection seat 21 with the suspension belt 10 as the rotation axis, preventing the suspension belt 10 from breaking due to twisting, and improving the reliability of the inner and outer container connection device 300.

[0030] Referring to FIGS. 4 and 5, a position-limiting guide groove 2111 is provided in the first position-limiting engagement seat 211. The first position-limiting portion 221 is fitted and accommodated in the position-limiting guide groove 2111. By the fitting of the first position-limiting portion 221 and the position-limiting guide groove 2111, the first connection member 22 is position-limited, and the first connection member 22 is restricted from twisting on the first connection seat 21 with the suspension belt 10 as the rotation axis, effectively preventing the suspension belt 10 from breaking due to twisting.

[0031] An adjustment structure 222 is provided on the first connecting member 22. The adjustment structure 222 moves the first position limiting portion 221 along the position limiting guide groove 2111 to adjust the distance between the first connecting member 22 and the second connecting assembly 30 and apply a biasing force to the hanging belt 10. By adjusting the position of the first position limiting portion 221 in the position limiting guide groove 2111 using the adjustment structure 222, an operator can adjust the distance between the first connecting member 22 and the second connecting assembly 30, adjust the slack of the hanging belt 10, apply a biasing force to the hanging belt 10, and keep the hanging belt 10 in a tensioned state, facilitating assembly.

[0032] 4, 5, and 7 to 9, the adjustment structure 222 includes an adjustment nut 2221 and an adjustment screw 2222. The adjustment screw 2222 protrudes from the first connecting member 22 and has a position limiting guide groove 2111 formed therein. The adjustment screw 2222 is fitted with the adjustment nut 2221, and the adjustment screw 2222 can move the first position limiting portion 221 along the position limiting guide groove 2111, thereby adjusting the distance between the first connecting member 22 and the second connecting assembly 30 and applying a biasing force to the suspension belt 10.

[0033] Specifically, when the adjusting nut 2221 is fitted onto the adjusting screw 2222 and fastened, the adjusting screw 2222 passes through the adjusting nut 2221 and protrudes therefrom, shortening the distance between the first connecting member 22 and the second connecting assembly 30, thereby tightening the hanging belt 10. When the adjusting nut 2221 is rotated in the opposite direction, the adjusting screw 2222 retracts in the opposite direction, increasing the distance between the first connecting member 22 and the second connecting assembly 30, thereby transitioning the hanging belt 10 from a tightened state to a loosened state. The position limiting guide groove 2111 serves to limit the position of the first position limiting portion 221 and prevent twisting, and also serves as a movement guide for the adjusting screw 2222 during the protruding and retracting process.

[0034] In this embodiment, a locking protrusion 2112 protrudes within the first position-limiting engagement seat 211. A lock stage 223 is provided on the first connection member 22. When the distance between the first connection member 22 and the second connection assembly 30 is adjusted to the maximum, the lock stage 223 abuts against the locking protrusion 2112. The lock stage 223 abuts against the locking protrusion 2112 to limit the maximum distance between the first connection member 22 and the second connection assembly 30, preventing the suspension belt 10 from being excessively pulled, and further improving the reliability of the inner and outer container connection device 300.

[0035] Here, the position-limiting guide groove 2111 is provided on the locking protrusion 2112, and the adjustment screw 2222 penetrates the position-limiting guide groove 2111. One side of the two opposite sides of the locking protrusion 2112 abuts against the lock stage 223, and the other side abuts against the adjustment nut 2221. By rotating the adjustment nut 2221 in fitting with the adjustment screw 2222, the adjustment screw 2222 protrudes or retracts with respect to the locking protrusion 2112, adjusting the position of the adjustment screw 2222 in the position-limiting guide groove 2111 of the first position-limiting portion 221.

[0036] In other embodiments, a first through hole is provided on the first connection member 22, a plurality of second through holes are provided on the first connection seat 21, the alignment between the first through hole on the first connection member 22 and the second hole at a position different from the first through hole is adjusted, and the first connection member 22 is fixed by drilling the first through hole and the second through hole with screws, thereby adjusting the position of the first connection member 22 in the position-limiting guide groove 2111 and adjusting the distance between the first connection member 22 and the second connection assembly 30. In this embodiment, the method of fitting the adjustment screw 2222 and the adjustment nut 2221 is adopted, with a simple structure and more convenient operation.

[0037] Referring to FIGS. 4 to 7, an opening 212 and a closing plate 213 may be installed on the first connection seat 21 on the side opposite to the suspension belt 10. After adjusting the suspension belt 10 to an appropriate slack by fitting the adjustment screw 2222 and the adjustment nut 2221, the opening 212 is covered by the closing plate 213 to seal the side of the first connection seat 21 facing away from the suspension belt 10.

[0038] Referring to FIGS. 4, 8 and 9, the suspension belt 10 is annular. The first connection assembly 20 further includes a first pin shaft 23. The first pin shaft 23 penetrates the first connection member 22. One end of the suspension belt 10 is inserted into the first pin shaft 23 and is rotatable about the first pin shaft 23. The first pin shaft 23 has a biasing function with respect to the suspension belt 10.

[0039] The first connection assembly 20 may further include a first bush 24, and one end of the suspension belt 10 is inserted into the first pin shaft 23 by the first bush 24. The first bush 24 can reduce the frictional force of the rotation of the suspension belt 10 around the first pin shaft 23 and reduce the wear of the suspension belt 10.

[0040] A first stopper portion 241 and a second stopper portion 242 are provided on the first bush 24. The first stopper portion 241 and the second stopper portion 242 are provided at intervals along the axial direction of the first pin shaft 23. One end of the suspension belt 10 is inserted between the first stopper portion 241 and the second stopper portion 242 to prevent the suspension belt 10 from sliding in the axial direction of the first pin shaft 23 and improve the connection stability of the inner and outer container connection device 300.

[0041] The second connection assembly 30 includes a second connection member 31 and a second pin shaft 32. The second connection member 31 is connected to the inner container 100. The second pin shaft 32 penetrates the second connection member 31 and is provided parallel to the first pin shaft 23. The other end of the suspension belt 10 is inserted into the second pin shaft 32 and can rotate around the second pin shaft 32. The second pin shaft 32 has a biasing function with respect to the suspension belt 10.

[0042] Since the suspension belt 10 is rotatably provided around the first pin shaft 23 and the second pin shaft 32, when the inner container 100 is displaced due to thermal expansion and contraction, the suspension belt 10 rotates and disperses the pulling force exerted on the suspension belt 10 by the inner container 100 to reduce it, and the possibility of the suspension belt 10 breaking can be reduced.

[0043] The second connection assembly 30 may further include a second bush 33, and one end of the suspension belt 10 is inserted into the second pin shaft 32 by the second bush 33. The second bush 33 can reduce the frictional force of the suspension belt 10 rotating around the second pin shaft 32 and reduce the wear of the suspension belt 10.

[0044] A third stopper portion 331 and a fourth stopper portion 332 are provided on the second bush 33. The third stopper portion 331 and the fourth stopper portion 332 are provided at intervals in the axial direction of the second pin shaft 32. By inserting the other end of the suspension belt 10 between the third stopper portion 331 and the fourth stopper portion 332, the suspension belt 10 is prevented from sliding in the axial direction of the second pin shaft 32, and the connection stability of the inner and outer container connection device 300 is improved.

[0045] When the adjustment screw 2222 of the adjustment structure 222 and the adjustment nut 2221 are fitted, the first position limiting portion 221 is moved within the position limiting guide groove 2111, and by adjusting the distance between the first connection member 22 and the second connection assembly 30, that is, the distance between the first pin shaft 23 and the second pin shaft 32, the slack of the suspension belt 10 is adjusted.

[0046] In other embodiments, referring to FIG. 10, the structure of the second connection assembly 30 may be the same as that of the first connection assembly 20. The second connection assembly 30 further includes a second connection seat. The second connection member 31 is fixedly connected to the inner container 100 by the second connection seat. A second position-limiting engagement seat is provided on the second connection seat. The second connection member 31 is provided with a second position-limiting portion 311, and the second position-limiting portion 311 is fitted and accommodated in the second position-limiting engagement seat to limit the second connection member 31 from twisting around the suspension belt 10 as the rotation axis relative to the second connection seat.

[0047] In the present application, the first connection assembly 20 of the inner and outer container connection device 300 is connected to the outer container 200, the second connection assembly 30 is connected to the inner container 100, one end of the suspension belt 10 is rotatably connected to the first connection member 22 of the first connection assembly 20, and the other end is rotatably connected to the second connection assembly 30. The first position-limiting portion 221 on the first connection member 22 is fitted and accommodated in the first position-limiting engagement seat 211 of the first connection seat 21 to limit the position of the first connection member 22 and regulate the first connection member 22 from twisting around the suspension belt 10 as the rotation axis relative to the first connection seat 21, thereby preventing the suspension belt 10 from twisting and breaking, improving the reliability of the inner and outer container connection device 300 and its cryogenic storage tank. At the same time, both ends of the suspension belt 10 are rotatably connected to the first connection assembly 20 and the second connection assembly 30 respectively. When the inner container 100 is displaced due to thermal expansion and contraction, the suspension belt 10 is rotatable relative to the first connection assembly 20 and the second connection assembly 30, reducing the acting force on the suspension belt 10 caused by the displacement of the inner container 100, effectively preventing the suspension belt 10 from breaking, and improving the reliability of the inner and outer container connection device 300 and the cryogenic storage tank.

[0048] A person skilled in the art can make equivalent substitutions or modifications based on the technical solution of the present disclosure and its inventive concept, and all these changes or substitutions fall within the protection scope of the claims appended to this application.

Claims

1. An inner and outer container connection device for a cryogenic storage tank including an inner container and an outer container, wherein the outer container covers the inner container, and the inner and outer container connection device is for connecting the inner container and the outer container, the inner and outer container connection device includes a suspension belt, a first connection assembly, and a second connection assembly, the first connection assembly is for connecting to the outer container, the first connection assembly includes a first connection seat and a first connection member, the first connection seat is for connecting to the outer container, and a first position limiting engagement seat is provided on the first connection seat. One end of the first connection member is rotatably connected to one end of the suspension belt, and a first position limiting portion is provided at the other end of the first connection member. A position limiting guide groove for fitting with the first position limiting portion is provided in the first position limiting engagement seat. The first position limiting portion is fitted and accommodated in the position limiting guide groove to limit the first connection member from twisting on the first connection seat with the suspension belt as the rotation axis, the second connection assembly is for connecting to the inner container, and the second connection assembly is rotatably connected to the other end of the suspension belt characterized in that it is an inner and outer container connection device for a cryogenic storage tank.

2. An adjustment structure is provided on the first connection member, and the adjustment structure moves the first position limiting portion along the position limiting guide groove to adjust the distance between the first connection member and the second connection assembly. The inner and outer container connection device according to claim 1, characterized in that.

3. The adjustment structure includes an adjustment nut and an adjustment screw protruding from the first connection member. The adjustment screw penetrates the position limiting guide groove. The adjustment screw is fitted with the adjustment nut so that the adjustment screw can move the first position limiting portion along the position limiting guide groove to adjust the distance between the first connection member and the second connection assembly. The inner and outer container connection device according to claim 2, characterized in that.

4. A locking protrusion protrudes in the first position limiting engagement seat, a locking stage is provided on the first connection member, and when the distance between the first connection member and the second connection assembly is adjusted to the maximum, the locking stage abuts against the locking protrusion. The inner and outer container connection device according to claim 3, characterized in that. Claim 5 The first connecting member is provided with a first through hole, the first connecting seat is provided with a plurality of second through holes, the alignment between the second through hole at a position different from the first through hole on the first connecting member is adjusted, the first through hole and the second through hole are drilled with screws to fix the first connecting member, and the distance between the first connecting member and the second connecting assembly is adjusted. The inner and outer container connecting device according to claim 2, characterized in that. Claim 6 The suspension belt is annular, the first connecting assembly further includes a first pin shaft, the first pin shaft penetrates the first connecting member, the second connecting assembly includes a second connecting member and a second pin shaft, the second connecting member is fixedly connected to the inner container, the second pin shaft penetrates the second connecting member and is provided parallel to the first pin shaft, and both ends of the suspension belt are inserted onto the first pin shaft and the second pin shaft respectively and are rotatable about the first pin shaft and the second pin shaft. The inner and outer container connecting device according to claim 1, characterized in that. Claim 7 The first connecting assembly further includes a first bush, the second connecting assembly further includes a second bush, one end of the suspension belt is inserted onto the first pin shaft by the first bush, and the other end of the suspension belt is inserted onto the second pin shaft by the second bush. The inner and outer container connecting device according to claim 6, characterized in that. Claim 8 The first bush is provided with a first stopper portion and a second stopper portion, the first stopper portion and the second stopper portion are distributed at intervals in the axial direction of the first pin shaft, one end of the suspension belt is inserted between the first stopper portion and the second stopper portion, the second bush is provided with a third stopper portion and a fourth stopper portion, the third stopper portion and the fourth stopper portion are distributed at intervals in the axial direction of the second pin shaft, and the other end of the suspension belt is inserted between the third stopper portion and the fourth stopper portion. The inner and outer container connecting device according to claim 7, characterized in that. Claim 9 The second connection assembly further includes a second connection base, on which a second position-limiting engagement seat is provided, and on the second connection member, a second position-limiting portion is provided. The second position-limiting portion is fitted and accommodated within the second position-limiting engagement seat to limit the second connection member from being twisted onto the second connection base with the suspension belt as the rotation axis. The second connection member is connected to the inner container by the second connection base. The inner and outer container connection device according to claim 6, characterized in that.

10. The material of the suspension belt is a fiber-reinforced resin composite material. The inner and outer container connection device according to claim 1, characterized in that.

11. The fiber in the fiber-reinforced resin composite material is carbon fiber, aramid fiber or glass fiber. The resin in the fiber-reinforced resin composite material is epoxy resin, polyamide resin or high-density polyethylene resin. The inner and outer container connection device according to claim 10, characterized in that.

12. An inner container, an outer container, and a plurality of inner and outer container connection devices of a cryogenic storage tank according to any one of claims 1 to 11, wherein the outer container covers the inner container, the inner and outer container connection devices connect the inner container and the outer container respectively, the plurality of inner and outer container connection devices are provided at an end of the inner container, are distributed at intervals in the circumferential direction of the inner container, and at least two of the inner and outer container connection devices are provided above the lateral axis plane of the inner container. The cryogenic storage tank, characterized in that.

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