Cryogenic storage tank

Abstract

The present invention relates to a low-temperature storage tank, comprising an inner container, an outer container and a support assembly; the outer container surrounds the inner container and forms an interlayer with the inner container; the support assembly is arranged in the interlayer; the support assembly comprises a movable support member and a fixed support member, and the movable support member and the fixed support member are arranged around the circumference of the inner container so that the stress of the inner container on the movable support member and the fixed support member is dispersed, and the problem of excessive local stress will not be caused. The movable support member and the fixed support member are both obliquely extended from the inner peripheral wall of the outer container to the outer peripheral wall of the inner container, and the extended arrangement makes the movable support member and the fixed support member have a certain length, and thus have a certain elasticity. Due to the elastic force, the movable support member or the fixed support member can effectively alleviate the impact force, reduce the impact force between the inner container and the outer container, and extend the service life of the storage tank.

Description

Technical Field

[0001] The invention relates to the field of natural gas, and in particular to a cryogenic storage tank. Background Art

[0002] The International Maritime Organization (IMO) requires the reduction of the sulfur content of fuel oil from July 1, 2010. From 2010, the sulfur content of fuel oil must be less than 3.5%, and from 2020 it will be reduced to 0.5%. In view of this, countries around the world have built dual-fuel powered ships, mainly fuel oil and natural gas, to meet IMO emission standards.

[0003] In view of the fact that the natural gas filling facilities are not perfect and the filling process is relatively cumbersome in the current technology, customers hope to fill less frequently to meet long-term operation needs. Therefore, liquefied natural gas (LNG) storage tanks continue to break through the capacity limit, from the original 200 cubic meters to 390 cubic meters to 500 cubic meters, and up to the current largest 685 cubic meters, and even 900 cubic meters of double-layer liquefied natural gas (LNG) storage tanks. At the same time, large seagoing ships are used for ocean transportation, and the one-way sailing distance is getting longer and longer. The volume of the required liquefied natural gas (LNG) storage tanks also tends to be larger, so the reliability of the internal and external connections of the liquefied natural gas (LNG) storage tanks is particularly important.

[0004] At present, cryogenic storage tanks generally include an outer container, an inner container contained in the outer container, and a support structure disposed between the outer container and the inner container. The inner container is used to contain cryogenic liquefied natural gas, and the support structure is used to support the inner container in the outer container. Since the inner container contains liquefied natural gas, during the acceleration or turning process of the ship, due to the effect of inertia, the support structure is likely to cause a large impact on the inner container, causing deformation of the inner container, thereby affecting the service life of the storage tank. Summary of the invention

[0005] The object of the present invention is to provide a low-temperature storage tank to increase the service life of the storage tank.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, the present invention provides a low-temperature storage tank, comprising an inner container, an outer container and a support assembly; the inner container is used to contain natural gas; the outer container surrounds the inner container and forms an interlayer between the outer container and the inner container; the support assembly is arranged in the interlayer; the support assembly comprises a movable support member and a fixed support member, and the movable support member and the fixed support member are both arranged around the circumference of the inner container; the movable support member and the fixed support member both extend obliquely from the inner circumferential wall of the outer container to the outer circumferential wall of the inner container; the two ends of the fixed support member are fixedly connected to the outer container and the inner container respectively, one end of the movable support member is fixedly connected to the inner circumferential wall of the outer container, and the other end movably abuts against the outer circumferential wall of the inner container.

[0008] In some embodiments, the support assembly also includes a ring plate; the ring plate is circumferentially arranged around the inner circumferential wall of the outer container and fixedly connected to the inner circumferential wall of the outer container, the ring plate extends toward the inner container and has a gap between the inner container; the ring plate is respectively arranged corresponding to the movable support member and the fixed support member, and the fixed support member and the movable support member are respectively welded to the corresponding sides of the ring plate.

[0009] In some embodiments, the ends of the fixed support member and the movable support member connected to the outer container are both provided with folded edges, and the folded edges are fitted to the ring plate.

[0010] In some embodiments, the movable support member and the fixed support member pass through the gap between the corresponding annular plate and the inner container, and the folded edge is welded to the inner peripheral wall of the outer container and the annular plate.

[0011] In some embodiments, an end of the movable support member for abutting against the inner container is provided with an abutment plate, so that the movable support member can be movably abutted against the inner container through the abutment plate; the abutment plate is circumferentially arranged around the outer circumference of the inner container.

[0012] In some embodiments, a pad is provided on the outer peripheral wall of the inner container corresponding to the support assembly, the movable support member movably abuts against the pad, and the fixed support member is welded to the pad.

[0013] In some embodiments, a first reinforcing plate is disposed on the inner circumferential wall of the inner container, the first reinforcing plate is circumferentially disposed around the inner circumferential wall of the inner container, and the first reinforcing plate is disposed corresponding to the pad.

[0014] In some embodiments, a second reinforcing plate is provided on the inner circumferential wall of the outer container, and the second reinforcing plate is circumferentially arranged around the inner circumferential wall of the outer container; the second reinforcing plates are respectively correspondingly arranged on the outer sides of the movable support member and the fixed support member.

[0015] In some embodiments, the movable support member and the fixed support member are both made of low-temperature resistant steel plates.

[0016] In some embodiments, the slope of the movable support and the fixed support to the axis of the inner container is no greater than 15 degrees.

[0017] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0018] In the present invention, the movable support and the fixed support are both arranged around the inner container, the fixed support is fixedly connected to the outer container and the inner container respectively, one end of the movable support is fixed to the inner circumferential wall of the outer container, and the other end is movably abutted against the outer circumferential wall of the inner container, and the inner container is surrounded by the movable support and the fixed support so that the stress of the inner container on the movable support and the fixed support is dispersed, and the problem of excessive local stress will not be caused. During the acceleration or turning process of the ship, the impact force generated by the inertia of the inner container can be effectively dispersed, reducing the impact on the inner container, thereby ensuring the structural stability of the inner container and improving the service life of the inner container.

[0019] Furthermore, both the movable support member and the fixed support member extend obliquely from the inner circumferential wall of the outer container to the outer circumferential wall of the inner container. The extended arrangement makes the movable support member and the fixed support member have a certain length and thus have a certain elasticity. The movable support member and the fixed support member extend obliquely between the inner container and the outer container. The forces exerted on the movable support member or the fixed support member by the inner container and the outer container are not on the same straight line. When the movable support member or the fixed support member is subjected to the force between the inner container and the outer container, the movable support member or the fixed support member can effectively alleviate the impact force due to the elastic force, reduce the impact force between the inner container and the outer container, and extend the service life of the storage tank.

[0020] At the same time, the movable support member and the fixed support member have a certain length, which prolongs the distance of heat conduction and reduces the heat exchange rate between the inner container 1 and the outer container 2 to maintain the low temperature environment of the inner container 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of a cryogenic storage tank of the present invention;

[0022] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 yes Figure 1 The enlarged view of point B in the middle;

[0024] Figure 4 yes Figure 2 Enlarged view of point C in the middle;

[0025] Figure 5 yes Figure 2 The enlarged view of point D in the middle;

[0026] Figure 6 yes Figure 3 Enlarged view of point E in the middle;

[0027] Figure 7 yes Figure 3 Enlarged view of point F in the middle.

[0028] The following are the descriptions of the reference numerals:

[0029] 1. Inner container; 11. Pad; 12. First reinforcing plate; 2. Outer container; 21. Second reinforcing plate; 3. Support assembly; 31. Movable support; 311. Folding edge; 32. Fixed support; 321. Folding edge; 33. Ring plate; 34. Abutment plate; 4. Connection place; 5. Saddle; 6. Interlayer; 7. Insulation material. DETAILED DESCRIPTION

[0030] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0031] See also Figures 1 to 3 This embodiment provides a cryogenic storage tank, which is mainly used for storing natural gas fuel on marine or inland ships. The cryogenic storage tank includes an inner container 1, an outer container 2, a support assembly 3, a connection place 4 and a saddle 5. The outer container 2 is fixed on the saddle 5; the inner container 1 is fixed in the outer container 2 through the support assembly 3.

[0032] The cryogenic storage tank of the present invention can be applied not only to natural gas storage tanks, but also to land storage tanks, cryogenic tank trucks and cryogenic box tanks.

[0033] Low-temperature storage tanks are generally placed in horizontal storage tanks and vertical storage tanks. The following takes a horizontal storage tank as an example, and the radial direction of the storage tank is used as the length direction of the storage tank.

[0034] In actual use, the inner container 1 releases natural gas to the corresponding mechanism on the ship through equipment such as pipelines, valves or vaporizers, and the connecting place 4 surrounds the equipment such as pipelines, valves or vaporizers. When natural gas leaks at the connection of the pipeline, valve or vaporizer, the leaked natural gas is absorbed by the connecting place 4 to avoid natural gas leakage to other locations of the ship, thereby ensuring the safety of the ship.

[0035] See also Figure 2 and Figure 3The inner container 1 is a hollow structure for containing cryogenic liquid. The inner container 1 is connected with corresponding pipelines for air intake or exhaust to replenish or discharge natural gas. At the same time, the inner container 1 is also provided with a corresponding boosting device to maintain the pressure of the natural gas in the inner container 1.

[0036] A pad 11 is provided on the outer periphery of the inner container 1. The pad 11 is provided around the outer peripheral wall of the inner container 1 and is attached to and fixed on the outer peripheral wall of the inner container 1. The pad 11 is used to connect with the support assembly 3 to fix the inner container 1 in the outer container 2.

[0037] In this embodiment, the pad 11 is welded to the outer peripheral wall of the inner container 1, and two pads 11 are provided along the length direction of the inner container 1. The outer surface of the pad 11 is smooth. In some embodiments, more than two pads 11 may be provided.

[0038] A first reinforcing plate 12 is disposed on the inner peripheral wall of the inner container 1 . A plurality of first reinforcing plates 12 are disposed inside the inner container 1 along the length direction of the inner container 1 .

[0039] In this embodiment, a first reinforcing plate 12 is provided inside the inner container 1 corresponding to each pad 11 to improve the strength and rigidity of the inner container 1 at the pad 11 .

[0040] The outer container 2 is disposed outside the inner container 1 and surrounds the inner container 1 to isolate the inner container 1 from the external environment and maintain the temperature of the inner container 1 .

[0041] The outer container 2 is a hollow structure, and the internal space of the outer container 2 is larger than the outer circumference of the inner container 1. An interlayer 6 is formed between the outer container 2 and the inner container 1. The interlayer 6 is filled with a thermal insulation material 7 and is evacuated by a vacuum device to form an insulation layer. The insulation layer can reduce the heat transfer between the inner container 1 and the outer container 2, achieve cold preservation and protection of the inner container 1, reduce the heat exchange between the inner container 1 and the outside world, so as to better maintain the low temperature environment in the inner container 1.

[0042] A second reinforcing plate 21 is disposed on the inner peripheral wall of the outer container 2 . A plurality of second reinforcing plates 21 are disposed inside the outer container 2 along the length direction of the outer container 2 to enhance the strength of the outer container 2 .

[0043] See also Figures 1 to 7 The supporting assembly 3 is arranged in the interlayer 6 and is used to fix the inner container 1 inside the outer container 2 to support the inner container 1.

[0044] The support assembly 3 is made of low temperature resistant steel to ensure the stability of the connection between the support assembly 3 and the inner container 1 .

[0045] The support assembly 3 includes a movable support member 31, a fixed support member 32 and a ring plate 33. The two ends of the fixed support member 32 are respectively fixedly connected to the outer container 2 and the inner container 1; one end of the movable support member 31 is fixedly connected to the outer container 2, and the other end is movably abutted against the outer peripheral wall of the inner container 1 to support the inner container 1.

[0046] The ring plate 33 is disposed around the inner periphery of the outer container 2 and is fixedly connected to the inner peripheral wall of the outer container 2. In this embodiment, the ring plate 33 is a circumferentially closed annular structure, and its outer side is welded to the inner peripheral wall of the outer container 2.

[0047] In this embodiment, two ring plates 33 are provided, and the two ring plates 33 are provided corresponding to the movable support member 31 and the fixed support member 32 respectively, so that the movable support member 31 and the fixed support member 32 are connected to the outer container 2 through the ring plates 33 .

[0048] The ring plate 33 extends toward the inner container 1 so that the ring plate 33 has a certain height inwardly along the radial direction of the outer container 2 or the inner container 1. There is a gap between the inner side of the ring plate 33 and the outer periphery of the inner container 1. In this embodiment, the ring plate 33 extends inwardly along the radial direction of the inner container 1 so that the ring plate 33 is vertically connected to the inner peripheral wall of the outer container 2.

[0049] The movable support member 31 and the fixed support member 32 are both circumferentially closed structures, and the movable support member 31 and the fixed support member 32 are structures with gradually decreasing sizes in the axial direction. In this embodiment, the movable support member 31 and the fixed support member 32 are both conical structures.

[0050] The tapered structure of the movable support member 31 and the fixed support member 32 makes it easier to arrange inner containers 1 of different sizes in the outer container 2 by using movable support members 31 and fixed support members 32 of different lengths and tapering degrees.

[0051] In this embodiment, the slope of the movable support member 31 and the fixed support member 32 with respect to the axis of the inner container 1 is not greater than 15 degrees, so as to ensure that the movable support member 31 and the fixed support member 32 have a longer length, extend the distance of heat conduction, and reduce the heat exchange rate between the inner container 1 and the outer container 2, so as to maintain the low temperature environment of the inner container 1.

[0052] Furthermore, a folded edge 311 is disposed outwardly along the radial direction at one end of the movable support member 31 with a larger diameter, and a folded edge 321 is disposed outwardly along the radial direction at one end of the fixed support member 32 with a larger diameter.

[0053] See also Figure 2 , Figure 4 and Figure 5 The movable support member 31 is arranged around the inner container 1 . In this embodiment, the movable support member 31 is arranged around the pad 11 .

[0054] Furthermore, one end of the movable support member 31 for abutting against the inner container 1 is provided with an abutment plate 34, so as to movably abut against the inner container 1 through the abutment plate 34. The inner end of the abutment plate 34 extends inwardly beyond the movable support member 31 along the radial direction of the inner container 1, so as to make the movable support member 31 indirectly abut against the outer peripheral wall of the inner container 1 through the abutment plate 34. In this embodiment, the abutment plate 34 movably abuts against the pad 11 of the inner container 1, so that the abutment plate 34 and the pad 11 can slide relative to each other along the radial direction of the inner container 1.

[0055] The movable support member 31 passes through the gap between the corresponding ring plate 33 and the inner container 1. Specifically, the folded edge 311 of the movable support member 31 is attached to the side of the pad 11 and fixed on the side of the ring plate 33, and the bottom end of the folded edge 311 of the movable support member 31 is welded to the inner wall of the outer container 2 and the ring plate 33.

[0056] See also Figure 3 , Figure 6 and Figure 7 The fixed support member 32 is arranged around the inner container 1 . In this embodiment, the fixed support member 32 is arranged around the pad 11 , and one end of the fixed support member 32 away from the folded edge 321 is welded to the pad 11 .

[0057] The fixed support member 32 passes through the gap between the corresponding ring plate 33 and the inner container 1. Specifically, the side of the folded edge 321 of the fixed support member 32 facing the pad 11 is attached to and fixed on the side of the ring plate 33, and the bottom end of the folded edge 321 of the fixed support member 32 is welded to the ring plate 33 and the inner wall of the outer container 2.

[0058] In this embodiment, a second reinforcing plate 21 is correspondingly provided on the outer side of the movable support member 31 and the fixed support member 32. When the movable support member or the fixed support member 32 is accidentally broken or bent, the second reinforcing plate 21 can play a supporting role to avoid contact between the inner container 1 and the outer container 2, thereby protecting the inner container 1 and the outer container 2.

[0059] See again Figure 2 and Figure 3 The saddle 5 is fixedly connected to the outer peripheral wall of the outer container 2 and is received under the outer container 2. Specifically, the saddle 5 is fixed on the ship and arranged at intervals along the length direction of the outer container 2 to fix the outer container 2 at a corresponding position on the ship.

[0060] In this embodiment, the saddle 5 is arranged corresponding to the support assembly 3 , and the saddle 5 corresponds to the ring plate 33 of the support assembly 3 to enhance the strength of the outer container 2 at the ring plate 33 .

[0061] In the present invention, the inner container 1 is used in a low temperature environment. When the inner container 1 is used, the temperature will change, so that under the effect of thermal expansion and contraction, the length of the inner container 1 will change to a certain extent. One end of the movable support member 31 is attached to the outer peripheral wall of the inner container 1. When the length of the inner container 1 changes, the outer peripheral wall of the inner container 1 can slide relative to the movable support member 31. The fixed support member 32 is fixed to the inner container 1 and the movable support member 31 is attached to the inner container 1. After the inner container 1 expands and contracts, the inner container 1 moves relative to the movable support member 31. After the length of the inner container 1 changes, the inner container 1 will not apply a shear force along the radial direction of the inner container 1 to the support assembly 3, so as to ensure that the length change of the inner container 1 will not be disturbed by the support assembly 3.

[0062] In the present invention, the movable support member 31 and the fixed support member 32 are both arranged around the inner container 1, and the fixed support member 32 is respectively fixedly connected to the outer container 2 and the inner container 1, and one end of the movable support member 31 is fixed to the inner circumferential wall of the outer container 2. The movable support member 31 and the fixed support member 32 surround the inner container 1 so that the stress of the inner container 1 on the movable support member 31 and the fixed support member 32 is dispersed, and the problem of excessive local stress will not be caused. During the acceleration or turning process of the ship, the impact force generated by the inertia of the inner container 1 can be effectively dispersed, reducing the impact on the inner container 1, thereby ensuring the structural stability of the inner container 1 and improving the service life of the inner container 1.

[0063] Furthermore, the movable support member 31 and the fixed support member 32 are both obliquely extended from the inner circumferential wall of the outer container 2 to the outer circumferential wall of the inner container 1. The extended arrangement makes the movable support member 31 and the fixed support member 32 have a certain length, and thus have a certain elasticity. The movable support member 31 and the fixed support member 32 are obliquely extended between the inner container 1 and the outer container 2. The forces of the inner container 1 and the outer container 2 on the movable support member 31 or the fixed support member 32 are not on the same straight line. When the movable support member 31 or the fixed support member 32 is subjected to the force between the inner container 1 and the outer container 2, the movable support member 31 or the fixed support member 32 can effectively alleviate the impact force due to the elastic force, thereby reducing the impact force between the inner container 1 and the outer container 2.

[0064] At the same time, when the size of the inner container 1 in the radial direction changes after thermal expansion and contraction, the elastic force of the movable support member 31 and the fixed support member 32 can also effectively alleviate the squeezing force on the inner container 1 .

[0065] The ring plate 33 extends toward the inner container 1, and the fixed support member 32 and the movable support member 31 are respectively welded to the side surfaces of the corresponding ring plate 33, so that the fixed support member 32 and the movable support member 31 are respectively fixedly connected to the outer container 2. By setting the ring plate 33, the fixed support member 32 or the movable support member 31 is welded to different height positions on the corresponding ring plate 33 to adjust the position between the fixed support member 32 or the movable support member 31 and the inner container 1, thereby effectively avoiding the problem that the inner container 1 cannot be assembled due to errors during manufacturing or installation. The setting of the ring plate 33 effectively alleviates the errors caused by the manufacturing or installation process and ensures the assembly between the support component 3 and the inner container 1.

[0066] The folded edge 311 / 321 is attached to the ring plate 33 and welded to the inner wall of the outer container 2 and the ring plate 33. Through the setting of the folded edge 311 / 321, the welding area of ​​the fixed support member 32 or the movable support member 31 and the ring plate 33 is increased, thereby enhancing the stability of the welding of the fixed support member 32 or the movable support member 31.

[0067] The side of the folded edge 311 of the movable support member 31 and the side of the folded edge 321 of the fixed support member 32 facing the pad 11 are attached and fixed to the side of the ring plate 33. When the force of the fixed support member 32 or the movable support member 31 is transmitted to the folded edge 311 / 321, since the side of the folded edge 311 / 321 facing the pad 11 is welded to the ring plate 33, the folded edge 311 / 321 is not easy to tear between the ring plate 33, thereby ensuring the stability of the welding between the folded edge 311 / 321 and the ring plate 33.

[0068] The bottom of the folded edge 311 / 321 is welded to the inner wall of the outer container 2 and the ring plate 33 , so that the folded edge 311 / 321 , the outer container 2 and the ring plate 33 are welded as a whole, thereby enhancing the welding strength of the folded edge 311 / 321 and the ring plate 33 .

[0069] The abutment plate 34 is circumferentially arranged around the outer periphery of the inner container 1, and the inner end of the abutment plate 34 extends inwardly beyond the movable support member 31 and fits against the outer peripheral wall of the inner container 1. The abutment plate 34 is always in contact with the outer peripheral wall of the inner container 1. The movable support member 31 is connected through the abutment plate 34 so that this end of the movable support member 31 is always supported on the outer periphery of the inner container 1, which can effectively compensate for the gap between the inner container 1 and the movable support member 31 due to manufacturing and installation, thereby ensuring uniform force on the outer periphery of the inner container 1.

[0070] Low-temperature resistant steel is used as the material of the support component 3. Compared with the prior art that the support component 3 uses glass fiber reinforced plastics as the material, the low-temperature resistant material has a greater shear resistance than the glass fiber reinforced plastics used in the prior art. When the support component 3 receives radial force along the inner container 1, it is not easy to bend or break, thereby ensuring the elasticity of the fixed support member 32 and the movable support member 31 and ensuring the rationality of the low-temperature storage tank.

[0071] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A cryogenic storage tank, characterized in that: include: Inner container, used to contain cryogenic liquid; an outer container, surrounding the inner container and forming an interlayer with the inner container; A support assembly is arranged in the interlayer; the support assembly comprises a movable support member and a fixed support member, the movable support member and the fixed support member are both arranged around the circumference of the inner container; the movable support member and the fixed support member both extend obliquely from the inner circumferential wall of the outer container to the outer circumferential wall of the inner container; the two ends of the fixed support member are respectively fixedly connected to the outer container and the inner container, one end of the movable support member is fixedly connected to the inner circumferential wall of the outer container, and the other end movably abuts against the outer circumferential wall of the inner container; The support assembly further includes a ring plate; the ring plate is disposed around the inner peripheral wall of the outer container and is fixedly connected to the inner peripheral wall of the outer container, and the ring plate extends toward the inner container and has a gap between the ring plate and the inner container; The fixed support member and the movable support member are both provided with a folded edge at one end connected to the outer container, and the folded edge is attached to the ring plate; the movable support member and the fixed support member pass through the gap between the corresponding ring plate and the inner container, and the folded edge is welded to the inner peripheral wall of the outer container and the ring plate; An abutment plate is provided at one end of the movable support member for contacting with the inner container, so that the movable support member can be movably abutted against the inner container through the abutment plate; the abutment plate is circumferentially arranged around the outer circumference of the inner container.

2. The cryogenic storage tank according to claim 1, characterized in that: The ring plates are respectively arranged corresponding to the movable support members and the fixed support members, and the fixed support members and the movable support members are respectively welded to the side surfaces of the corresponding ring plates.

3. The cryogenic storage tank according to claim 1, characterized in that: A pad is provided on the outer peripheral wall of the inner container corresponding to the support assembly, the movable support member is movably abutted against the pad, and the fixed support member is welded to the pad.

4. The cryogenic storage tank according to claim 3, characterized in that: A first reinforcing plate is arranged on the inner peripheral wall of the inner container. The first reinforcing plate is arranged circumferentially around the inner peripheral wall of the inner container. The first reinforcing plate is arranged corresponding to the pad.

5. The cryogenic storage tank according to claim 1, characterized in that: A second reinforcing plate is arranged on the inner circumferential wall of the outer container, and the second reinforcing plate is arranged around the inner circumferential wall of the outer container; the second reinforcing plates are respectively arranged on the outer sides of the movable support member and the fixed support member.

6. The cryogenic storage tank according to claim 1, characterized in that: The movable support member and the fixed support member are both made of low-temperature resistant steel plates.

7. The cryogenic storage tank according to claim 1, characterized in that: The slope of the movable support member and the fixed support member with respect to the axis of the inner container is not greater than 15 degrees.

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