Double-layer liquid hydrogen spherical tank

Abstract

The present application relates to the technical field of low-temperature liquid hydrogen storage, and particularly relates to a double-layer liquid hydrogen spherical tank. The double-layer liquid hydrogen spherical tank provided by the present application comprises an outer tank, an inner tank, a connecting unit and a supporting unit. The inner tank is arranged in the outer tank at intervals. The connecting unit comprises a plurality of connecting assemblies arranged at intervals around the lateral side of the inner tank. Each connecting assembly comprises two connecting rods. One end of each connecting rod is movably connected to the outer wall of the inner tank, and the other end of each connecting rod is movably connected to the inner wall of the outer tank, so that the inner tank is supported on the inner wall of the outer tank. The supporting unit is supported on the outer wall of the outer tank. The two connecting rods in each connecting assembly are arranged oppositely, and the connecting rods are arranged obliquely relative to the radial line of the inner tank. Under the action of a seismic load, when the inner tank is twisted, the tensile force of the connecting rods will generate a tangential tensile force component to offset the rotational inertia force component of the inner tank, so that the twisting of the inner tank relative to the outer tank can be limited, and the failure risk of the spherical tank can be reduced.

Description

Technical Field

[0001] This invention relates to the field of cryogenic liquid hydrogen storage technology, and more particularly to a double-walled liquid hydrogen spherical tank. Background Technology

[0002] Hydrogen, as an excellent energy carrier, boasts advantages such as high efficiency, cleanliness, and zero pollution, making it one of the most promising clean energy sources currently available. Key technologies for hydrogen energy utilization include hydrogen production, storage, transportation, and application, with hydrogen storage being a crucial link in the hydrogen energy industry chain. Cryogenic liquid hydrogen storage containers mainly come in two types: cylindrical and spherical, with a depth greater than 500m³. 3 Liquid hydrogen storage tanks are generally spherical containers. Currently, the main structure of existing cryogenic liquid hydrogen spherical tanks is a double-layer spherical tank structure, with insulation material filling the gap between the inner and outer tanks. However, due to the inadequacy of the support structure between the inner and outer tanks, under extreme conditions (such as earthquakes), the inner and outer tanks are prone to relative rotation, leading to tank failure. Summary of the Invention

[0003] This application provides a double-walled liquid hydrogen spherical tank, which to some extent improves the technical problem in related technologies where the inner and outer tanks are prone to relative rotation under extreme conditions (such as earthquakes) due to insufficient support structure between them, leading to tank failure.

[0004] This application provides a double-walled liquid hydrogen spherical tank, comprising:

[0005] An outer tank and an inner tank, wherein the inner tank is disposed at an interval within the outer tank;

[0006] The connecting unit includes multiple connecting components spaced apart around the periphery of the inner tank. Each connecting component includes two connecting rods, one end of which is movably connected to the outer wall of the inner tank and the other end of which is movably connected to the inner wall of the outer tank, so that the inner tank is supported by the inner wall of the outer tank.

[0007] Support unit, supported on the outer wall of the outer tank;

[0008] In this connection assembly, the two connecting rods are arranged opposite each other, and the connecting rods are inclined relative to the radial line of the inner tank to restrict the inner tank from twisting relative to the outer tank.

[0009] In some embodiments, the included angle between the two connecting rods in the connecting assembly is 30 to 175°.

[0010] In some embodiments, the openings formed by the two connecting rods in the connecting assembly face the inner tank.

[0011] In some embodiments, at least one connecting unit is provided at the upper and lower parts between the inner tank and the outer tank.

[0012] In some embodiments, there is a height difference between the connection point of the connecting rod to the outer tank and the connection point of the connecting rod to the inner tank.

[0013] In some embodiments, the connecting rod includes a connecting portion and a first movable portion and a second movable portion disposed opposite to each other at both ends of the connecting portion, wherein the first movable portion and the second movable portion each include a first hinge seat and a second hinge seat.

[0014] In the first movable part, one end of the first hinge seat is fixed to the inner wall of the outer tank, one end of the second hinge seat is rotatably hinged to the other end of the first hinge seat in a first direction, and one end of the connecting part is rotatably hinged to the other end of the second hinge seat in a second direction.

[0015] In the second movable part, one end of the first hinge seat is fixed to the outer wall of the inner tank, one end of the second hinge seat is rotatably hinged to the other end of the first hinge seat in a first direction, and the other end of the connecting part is rotatably hinged to the other end of the second hinge seat in a second direction.

[0016] Wherein, the first direction and the second direction are perpendicular.

[0017] In some embodiments, the connecting part includes a first connecting rod, a second connecting rod, and a threaded tension joint. The first connecting rod is connected to a second hinge seat of the first movable part, the second connecting rod is connected to a second hinge seat of the second movable part, and the threaded tension joint is threaded between the first connecting rod and the second connecting rod, with the threads of the first connecting rod and the second connecting rod having opposite directions.

[0018] In some embodiments, the connecting rod further includes a third connecting rod and a cooling block, wherein the third connecting rod is connected to the second hinge seat of the first movable part, and the cooling block is fixedly disposed between the third connecting rod and the first connecting rod.

[0019] In some embodiments, the cold insulation block includes a cold insulation block body, connecting bolts, connecting nuts, and connecting plates disposed on both sides of the cold insulation block body. The two connecting plates are respectively connected to the first connecting rod and the third connecting rod, and the cold insulation block body and the connecting plates are connected by the connecting bolts and the connecting nuts.

[0020] In some embodiments, the insulation block is disposed close to the inner wall of the outer tank.

[0021] The beneficial effects of this application are as follows:

[0022] This application provides a double-walled liquid hydrogen spherical tank. Because the two connecting rods in the connecting assembly are arranged opposite each other and the connecting rods are inclined relative to the radial line of the inner tank, under seismic loads, when the inner tank twists, the tension of the connecting rods will generate a tangential tensile force component to counteract the rotational inertia force component of the inner tank. This can limit the twisting of the inner tank relative to the outer tank and reduce the failure risk of the spherical tank. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0024] Figure 1 This is a schematic diagram of the structure of the double-layered liquid hydrogen spherical tank provided in this embodiment.

[0025] Figure 2 for Figure 1 Top view.

[0026] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0027] Figure 4 for Figure 2 Side view of the connecting rod in the middle.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Double-layer liquid hydrogen spherical tank, 10-Outer tank, 20-Inner tank, 30-Connecting unit, 300-Connecting assembly, 310-Connecting rod, 310a-First connecting rod, 310b-Second connecting rod, 310c-First hinge point, 310d-Second hinge point, 310e-Third hinge point, 310f-Fourth hinge point, 311-First movable part, 311a-First hinge seat, 311b-Second hinge seat, 312-The... Part II, 313-Connecting part, 313a-First connecting rod, 313b-Second connecting rod, 313c-Threaded tension joint, 313d-Third connecting rod, 314-Cold insulation block, 314a-Cold insulation block body, 314b-Connecting plate, 314c-Connecting bolt, 314d-Connecting nut, 314e-Cold insulation gasket, 40-Support unit, 41-Outer tank support column, 42-Support column tie rod, 43-Foundation damping, 50-Insulation material. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0035] Combination Figure 1 and Figure 2This application provides a double-layer liquid hydrogen spherical tank 1, including an outer tank 10, an inner tank 20, a connecting unit 30, and a supporting unit 40. The inner tank 20 is spaced apart within the outer tank 10; the connecting unit 30 includes a plurality of connecting components 300 spaced apart around the circumference of the inner tank 20, each connecting component 300 including two connecting rods 310, one end of which is movably connected to the outer wall of the inner tank 20 and the other end of which is movably connected to the inner wall of the outer tank 10, so that the inner tank 20 is supported by the inner wall of the outer tank 10; the supporting unit 40 is supported by the outer wall of the outer tank 10; wherein, the two connecting rods 310 in the connecting component 300 are arranged opposite to each other, and the connecting rods 310 are inclined relative to the radial line of the inner tank 20 to restrict the inner tank 20 from twisting relative to the outer tank 10.

[0036] The inner tank 20 and the outer tank 10 are concentrically arranged. The inner tank 20 can be made of austenitic stainless steel, aluminum alloy, or titanium alloy capable of withstanding liquid hydrogen at -253℃, while the outer tank 10 can be made of low-temperature carbon steel. Considering the convenience of construction within the annular space, the gap width between the inner tank 20 and the outer tank 10 can be 1.0 to 3.0 m, and the gap between the inner tank 20 and the outer tank 10 is filled with thermal insulation material 50, which can be vacuum-filled with expanded perlite, vacuum-filled with glass microspheres, etc.

[0037] The support unit 40 includes an outer tank support column 41, a support column tie rod 42, and a foundation damping 43. Multiple outer tank support columns 41 are provided and are distributed at intervals around the outer tank 10 to support the outer tank 10, so that there is a gap between the outer tank 10 and the ground. A support column tie rod 42 is provided between two adjacent outer tank support columns 41. The foundation damping 43 is set at the bottom of the outer tank support column 41 to reduce the impact of horizontal seismic loads on the spherical tank and improve the seismic resistance of the storage tank system.

[0038] Multiple connecting components 300 are evenly distributed around the periphery of the inner tank 20 to ensure uniform force distribution. The connecting rods 310 can be made of a metal material capable of withstanding the cryogenic temperature of liquid hydrogen. The two ends of the connecting rods 310 are respectively connected to the outer wall of the inner tank 20 and the inner wall of the outer tank 10, so that the inner tank 20 can be suspended in the outer tank 10, achieving the spaced arrangement of the inner tank 20 in the outer tank 10. Since the connecting rods 310 are movably connected to both the outer wall of the inner tank 20 and the inner wall of the outer tank 10, when the inner tank 20 contracts in a cold state, it can deform freely in the radial direction of the spherical coordinates without constraint. When the inner tank 20 undergoes radial contraction or expansion, the angle of the connecting rods 310 changes accordingly until an equilibrium state is reached.

[0039] The two connecting rods 310 in each connecting assembly 300 are arranged opposite each other along one of the radial lines of the inner tank 20, and the connecting rods 310 are inclined relative to the radial line. Thus, the two connecting rods 310 in the connecting assembly 300 can form a figure-eight shape. Under seismic load, when the inner tank 20 is torn, the tension of the connecting rods 310 will generate a tangential tensile force component to counteract the rotational inertia force component of the inner tank 20. This can limit the torsion of the inner tank 20 relative to the outer tank 10 and reduce the failure risk of the spherical tank.

[0040] In some embodiments, the openings formed by the two connecting rods 310 in the connecting assembly 300 face the inner tank 20.

[0041] As mentioned above, the two connecting rods 310 in the connecting assembly 300 are in the shape of an "eight". Therefore, the connecting assembly 300 has an opening. In order to make the connection points between the inner tank 20 and the connecting rods 310 more evenly distributed, thereby making the force more even, the opening formed by the two connecting rods 310 faces the inner tank 20, and the included angle between the two connecting rods 310 in the connecting assembly 300 can be 30° to 175°. Within this angle range, the limiting effect of the connecting assembly 300 is the best.

[0042] Of course, in other embodiments, the opening formed by the two connecting rods 310 may also face the outer tank 10, and there is no limitation on this.

[0043] In some embodiments, in order to improve the supporting effect of the outer tank 10 on the inner tank 20, at least one connecting unit 30 is provided at the upper and lower parts between the inner tank 20 and the outer tank 10.

[0044] A connecting unit 30 is disposed in the gap between the inner tank 20 and the outer tank 10. The upper part of the gap between the inner tank 20 and the outer tank 10 is the portion above the equator of the two tanks, and the lower part is the portion below the equator of the two tanks. Providing at least one connecting unit 30 in both the upper and lower parts of the gap ensures the uniformity of the supporting force on the inner tank 20 and improves the supporting effect of the outer tank 10 on the inner tank 20. Of course, one, two, or more connecting units 30 can be provided in the upper and lower parts of the gap respectively; there is no limitation on this.

[0045] Under normal operating conditions, the connecting unit 30 mainly bears the gravity load of the inner tank 20. Under seismic load conditions, the tensile force of the connecting rod 310 will increase or decrease due to the vertical seismic force. When the inner tank 20 is subjected to horizontal seismic load, the connecting unit 30 restricts the horizontal displacement and rotation of the inner tank 20. Therefore, the connecting rod 310 can be regarded as bearing axial tensile force under any conditions and not bearing bending moment.

[0046] In some embodiments, there is a height difference between the connection point of the connecting rod 310 to the outer tank 10 and the connection point of the connecting rod 310 to the inner tank 20.

[0047] That is, for the same connecting rod 310, the connection point between it and the outer tank 10 and the connection point between it and the inner tank 20 have a difference in the vertical plane. This height difference can be determined based on the expansion displacement of the inner tank 20 at low and high temperatures, ensuring the free contraction and expansion of the inner tank 20. Of course, since the connecting rod 310 is inclined relative to the radial line of the inner tank 20, the connection point between the connecting rod 310 and the outer tank 10 and the connection point between the connecting rod 310 and the inner tank 20 also have a difference in the horizontal direction.

[0048] Under normal operating conditions, when the inner tank 20 is refilled with liquid hydrogen, the inner tank 20 will undergo radial contraction. When the inner tank 20 is empty, the temperature rise will cause the inner tank 20 to expand radially. Since the connecting rod 310 has a difference in both the horizontal and vertical directions, it can be ensured that the free contraction of the inner tank 20 is unrestrained and will not cause excessive local stress at the tank wall connection position.

[0049] In some implementations, combined Figure 3 and Figure 4 The connecting rod 310 includes a connecting portion 313 and a first movable portion 311 and a second movable portion 312 disposed opposite to each other at both ends of the connecting portion 313. The first movable portion 311 and the second movable portion 312 each include a first hinge seat 311a and a second hinge seat 311b. In the first movable portion 311, one end of the first hinge seat 311a is fixed to the inner wall of the outer tank 10, and one end of the second hinge seat 311b is rotatably hinged to the other end of the first hinge seat 311a around a first direction. One end of the connecting portion 313 is rotatably hinged to the other end of the second hinge seat 311b around a second direction. In the second movable portion 312, one end of the first hinge seat 311a is fixed to the outer wall of the inner tank 20, and one end of the second hinge seat 311b is rotatably hinged to the other end of the first hinge seat 311a around a first direction. The other end of the connecting portion 313 is rotatably hinged to the other end of the second hinge seat 311b around a second direction. The first direction and the second direction are perpendicular.

[0050] Both the first movable part 311 and the second movable part 312 have two hinge points, i.e., two rotational degrees of freedom. Specifically, the second direction is parallel to the axial direction of the inner tank 20 and the outer tank 10. Under horizontal seismic load, the inner tank 20 will move horizontally relative to the outer tank 10 under the action of inertial force. Under this condition, the connecting rod 310 will restrict the horizontal displacement of the inner tank 20's spherical shell, and the tension of all connecting rods 310 will generate a resultant force component opposite to the direction of horizontal movement, thus counteracting the effect of inertial force.

[0051] Under vertical seismic load, the inner tank 20 will move vertically relative to the outer tank 10 under the action of inertial force. When the inner tank 20 moves upward, the connecting rod 310 above the equator will generate a downward tensile force component to counteract the upward inertial force of the inner tank 20. When the inner tank 20 moves downward, the connecting rod 310 below the equator will generate an upward tensile force component to counteract the downward inertial force of the inner tank 20.

[0052] To further explain the principle by which the connecting component 300 in this application embodiment restricts the rotation of the inner tank 20 relative to the outer tank 10, the following is combined with... Figure 2 Taking the force on one of the connecting units 30 as an example, and for ease of explanation, the two connecting rods 310 in this connecting unit 30 are named the first connecting rod 310a and the second connecting rod 310b, respectively. In the first connecting rod 310a, the hinge points on the two second hinge seats 311b are named the first hinge point 310c and the second hinge point 310d, respectively; in the second connecting rod 310b, the hinge points on the two second hinge seats 311b are named the third hinge point 310e and the fourth hinge point 310f, respectively.

[0053] When the inner tank 20 rotates clockwise, the distance between the first hinge point 310c and the second hinge point 310d in the first connecting rod 310a decreases, and the first connecting rod 310a is in a relaxed state and not under any force. The first connecting rod 310a exerts no force on the inner tank 20. In the second connecting rod 310b, the distance between the first hinge point 310c and the second hinge point 310d decreases, and the second connecting rod 310b is in a tensile state. The second connecting rod 310b will generate a tensile force on the inner tank 20. This tensile force can be decomposed into two components: one component is tangential to the connection point of the inner tank 20, and the other component is radial. The tangential component can prevent the rigid clockwise rotation of the inner tank 20, and the radial component can prevent the rigid radial displacement of the inner tank 20.

[0054] Similarly, when the inner tank 20 rotates counterclockwise, the force on the connecting rod 310 is the opposite of that described above.

[0055] In some embodiments, to determine the spatial position of the inner tank 20 inside the outer tank 10, the connecting part 313 includes a first connecting rod 313a, a second connecting rod 313b, and a threaded tension joint 313c. The first connecting rod 313a is connected to the second hinge seat 311b of the first movable part 311, the second connecting rod 313b is connected to the second hinge seat 311b of the second movable part 312, and the threaded tension joint 313c is threaded between the first connecting rod 313a and the second connecting rod 313b, and the thread directions of the first connecting rod 313a and the second connecting rod 313b are opposite.

[0056] Because the threads of the first connecting rod 313a and the second connecting rod 313b are in opposite directions, when rotating the threaded locking joint, the first connecting rod 313a and the second connecting rod 313b can be simultaneously screwed into or out of the threaded tensioning joint 313c to adjust the total length of the connecting rod 310. When installing the inner tank 20, the threaded tensioning joint 313c can be adjusted to make the center of the inner tank 20 coincide with the center of the outer tank 10, ensuring that the inner tank 20 and the outer tank 10 are concentric and preventing uneven gaps between the inner tank 20 and the outer tank 10 from causing excessive deviation in the insulation space. After adjustment, the two ends of the threaded tensioning joint 313c can be welded and fixed to the first connecting rod 313a and the second connecting rod 313b respectively to prevent loosening of the threaded connection under low-temperature conditions.

[0057] In some embodiments, since the connecting rod 310 has a high thermal conductivity, in order to reduce the amount of cold lost through the connecting rod 310, the connecting rod 310 further includes a third connecting rod 313d and a cold insulation block 314. The third connecting rod 313d is connected to the second hinge seat 311b of the first movable part 311, and the cold insulation block 314 is fixedly disposed between the third connecting rod 313d and the first connecting rod 313a.

[0058] As mentioned above, the connecting rod 310 is made of a metal material that can withstand the low temperature of liquid hydrogen. Since metal materials have high thermal conductivity, a cold insulation block 314 is provided in the connecting rod 310 to prevent the rod from conducting the cold energy of the inner tank 20 and the annular gap to the outer tank 10 to a certain extent.

[0059] In some embodiments, the cold insulation block 314 includes a cold insulation block body 314a, a connecting bolt 314c, a connecting nut 314d, and connecting plates 314b disposed on both sides of the cold insulation block body 314a. The two connecting plates 314b are respectively connected to the first connecting rod 313a and the third connecting rod 313d. The cold insulation block body 314a and the connecting plates 314b are connected by the connecting bolt 314c and the connecting nut 314d.

[0060] The insulation block body 314a is made of solid thermal insulation material 50 that can withstand cryogenic liquid hydrogen and has a certain compressive strength. The connecting plate 314b can be a steel plate, and the two connecting plates 314b are welded to the first connecting rod 313a and the third connecting rod 313d respectively. After the connecting bolt 314c is tightened, the connecting nut 314d can be welded to the connecting bolt 314c to prevent the threaded connection from loosening under low temperature conditions.

[0061] In addition, a cold insulation gasket 314e can be installed at the bolt holes of the connecting plate 314b to reduce the heat conduction between the connecting bolt 314c and the connecting plate 314b.

[0062] In some embodiments, the cold insulation block 314 is disposed close to the inner wall of the outer tank 10.

[0063] In addition, the insulation material 50 filling the space between the inner tank 20 and the outer tank 10 will also transfer cold energy to the connecting rod 310. If the cold insulation block 314 is installed near the inner tank 20, the insulation material 50 will transfer more cold energy to the part of the connecting rod 310 near the outer tank 10, resulting in the outer tank 10 being too cold. Since the material of the outer tank 10 cannot withstand low temperatures, the cold insulation block 314 should be arranged as close as possible to the outer tank 10.

[0064] The double-walled liquid hydrogen spherical tank 1 provided in this application has two connecting rods 310 in the connecting assembly 300 arranged opposite to each other, and the connecting rods 310 are inclined relative to the radial line of the inner tank 20. Under seismic load, when the inner tank 20 is torn, the tension of the connecting rods 310 will generate a tangential tension component to counteract the rotational inertia component of the inner tank 20, thereby limiting the torsion of the inner tank 20 relative to the outer tank 10 and reducing the failure risk of the spherical tank.

[0065] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0066] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A double-walled liquid hydrogen spherical tank, characterized in that, include: An outer tank and an inner tank, wherein the inner tank is disposed at an interval within the outer tank; The connecting unit includes multiple connecting components spaced apart around the periphery of the inner tank. Each connecting component includes two connecting rods, one end of which is movably connected to the outer wall of the inner tank and the other end of which is movably connected to the inner wall of the outer tank, so that the inner tank is supported by the inner wall of the outer tank. The two connecting rods in the connecting component are arranged opposite to each other, and the connecting rods are inclined relative to the radial line of the inner tank to limit the torsion of the inner tank relative to the outer tank. Support unit, supported on the outer wall of the outer tank; The inner tank and the outer tank are provided with at least one connecting unit at the upper and lower parts. When the inner tank moves upward, the connecting rod above the equator will generate a downward pulling force to counteract the upward inertial force of the inner tank. When the inner tank moves downward, the connecting rod below the equator will generate an upward pulling force to counteract the downward inertial force of the inner tank. The upper part between the inner tank and the outer tank is the portion of the inner tank and the outer tank above the equator, and the lower part between the inner tank and the outer tank is the portion of the inner tank and the outer tank below the equator.

2. The double-walled liquid hydrogen spherical tank according to claim 1, characterized in that, The included angle between the two connecting rods in the connecting assembly is 30° to 175°.

3. The double-walled liquid hydrogen spherical tank according to claim 1, characterized in that, The openings formed by the two connecting rods in the connecting assembly face the inner tank.

4. The double-walled liquid hydrogen spherical tank according to claim 1, characterized in that, There is a height difference between the connection point of the connecting rod to the outer tank and the connection point of the connecting rod to the inner tank.

5. The double-walled liquid hydrogen spherical tank according to any one of claims 1-4, characterized in that, The connecting rod includes a connecting part and a first movable part and a second movable part disposed opposite to each other at both ends of the connecting part. The first movable part and the second movable part each include a first hinge seat and a second hinge seat. In the first movable part, one end of the first hinge seat is fixed to the inner wall of the outer tank, one end of the second hinge seat is rotatably hinged to the other end of the first hinge seat in a first direction, and one end of the connecting part is rotatably hinged to the other end of the second hinge seat in a second direction. In the second movable part, one end of the first hinge seat is fixed to the outer wall of the inner tank, one end of the second hinge seat is rotatably hinged to the other end of the first hinge seat in a first direction, and the other end of the connecting part is rotatably hinged to the other end of the second hinge seat in a second direction. Wherein, the first direction and the second direction are perpendicular.

6. The double-walled liquid hydrogen spherical tank according to claim 5, characterized in that, The connecting part includes a first connecting rod, a second connecting rod, and a threaded tension joint. The first connecting rod is connected to the second hinge seat of the first movable part, and the second connecting rod is connected to the second hinge seat of the second movable part. The threaded tension joint is threaded between the first connecting rod and the second connecting rod, and the thread directions of the first connecting rod and the second connecting rod are opposite.

7. The double-walled liquid hydrogen spherical tank according to claim 6, characterized in that, The connecting rod also includes a third connecting rod and a cold insulation block. The third connecting rod is connected to the second hinge seat of the first movable part, and the cold insulation block is fixedly disposed between the third connecting rod and the first connecting rod.

8. The double-walled liquid hydrogen spherical tank according to claim 7, characterized in that, The cold insulation block includes a cold insulation block body, connecting bolts, connecting nuts, and connecting plates disposed on both sides of the cold insulation block body. The two connecting plates are respectively connected to the first connecting rod and the third connecting rod. The cold insulation block body and the connecting plates are connected by the connecting bolts and the connecting nuts.

9. The double-walled liquid hydrogen spherical tank according to claim 7, characterized in that, The insulation block is positioned close to the inner wall of the outer tank.

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