Double-layer liquid hydrogen spherical tank

Abstract

The invention relates to the technical field of low-temperature liquid hydrogen storage, in particular to a double-layer liquid hydrogen spherical tank. The embodiment of the invention provides a double-layer liquid hydrogen spherical tank. The double-layer liquid hydrogen spherical tank comprises an outer tank, an inner tank, a connecting unit and a supporting unit. The inner tanks are arranged in the outer tank at intervals; the connecting unit comprises a plurality of connecting assemblies arranged around the peripheral side of the inner tank at intervals, each connecting assembly comprises two connecting rod pieces, one end of each connecting rod piece is movably connected to the outer wall of the inner tank, and the other end of each connecting rod piece 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 rod pieces in the connecting assembly are oppositely arranged, the connecting rod pieces are obliquely arranged relative to the radial line of the inner tank, under the action of earthquake loads, when the inner tank is twisted, the tensile force of the connecting rod pieces generates a tangential tensile force component to offset the rotating inertia force component of the inner tank, and therefore twisting of the inner tank relative to the outer tank can be limited; the failure risk of the spherical tank is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic liquid hydrogen storage, and in particular to a double-layer liquid hydrogen spherical tank. Background Art

[0002] As an excellent energy carrier, hydrogen has the advantages of high efficiency, cleanliness and no pollution. It is one of the clean energy sources with the most promising application prospects. The key technologies for hydrogen energy utilization include hydrogen production, storage, transportation and application, among which hydrogen storage is a key link in the hydrogen energy industry chain. There are two main types of cryogenic liquid hydrogen storage containers: cylindrical and spherical containers. 3 Liquid hydrogen storage tanks generally use spherical containers. At present, the main structure of existing cryogenic liquid hydrogen spherical tanks is a double-layer spherical tank structure, and the gap between the inner and outer tanks is filled with insulation materials. However, due to the lack of supporting structure between the inner and outer tanks, under extreme conditions (such as earthquakes), the inner and outer tanks are prone to relative rotation, resulting in tank failure. Summary of the invention

[0003] The present application provides a double-layer liquid hydrogen spherical tank, which to a certain extent improves the technical problem in the related technology that due to the insufficient support structure between the inner and outer tanks, the inner and outer tanks are prone to relative rotation under extreme conditions (such as earthquakes), resulting in tank failure.

[0004] The embodiment of the present application provides a double-layer liquid hydrogen spherical tank, comprising:

[0005] An outer tank and an inner tank, wherein the inner tank is spaced apart and arranged in the outer tank;

[0006] A connecting unit, comprising a plurality of connecting assemblies spaced around the circumference of the inner tank, wherein the connecting assemblies include two connecting rods, one end of the connecting rods being movably connected to the outer wall of the inner tank and the other end of the connecting rods being 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;

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

[0008] Wherein, the two connecting rods in the connecting assembly are arranged opposite to each other, and the connecting rods are arranged obliquely relative to the radial line of the inner tank to limit the torsion of the inner tank relative to the outer tank.

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

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

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

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

[0013] In some embodiments, the connecting rod comprises a connecting portion and a first movable portion and a second movable portion which are arranged at two ends of the connecting portion, and the first movable portion and the second movable portion both comprise 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 hinged to the other end of the first hinge seat rotatably around the first direction, and one end of the connecting part is hinged to the other end of the second hinge seat rotatably around the 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 hinged to the other end of the first hinge seat rotatably around the first direction, and the other end of the connecting part is hinged to the other end of the second hinge seat rotatably around the second direction;

[0016] The first direction is perpendicular to the second direction.

[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 the second hinge seat of the first movable part, the second connecting rod is connected to the second hinge seat of the second movable part, the threaded tension joint is threadedly connected 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.

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

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

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

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

[0022] The present application provides a double-layer liquid hydrogen spherical tank. Since the two connecting rods in the connecting assembly are arranged relative to each other and the connecting rods are arranged obliquely relative to the radial line of the inner tank, when the inner tank is twisted under the action of seismic load, the tension of the connecting rods will generate a tangential tension component to offset the rotational inertia force component of the inner tank, thereby limiting the twisting of the inner tank relative to the outer tank and reducing the failure risk of the spherical tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

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

[0025] Figure 2 for Figure 1 Top view of the .

[0026] Figure 3 for Figure 2 A partial enlarged view of .

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

[0028] Description of reference numerals:

[0029] 1-double-layer liquid hydrogen spherical tank, 10-outer tank, 20-inner tank, 30-connection unit, 300-connection assembly, 310-connection rod, 310a-first connection rod, 310b-second connection 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-first hinge point Two movable parts, 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 sleeve, 40-support unit, 41-outer tank support, 42-support rod, 43-foundation damping, 50-insulation material. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0035] Combination Figure 1 and Figure 2The embodiment of the present application provides a double-layer liquid hydrogen spherical tank 1, comprising an outer tank 10, an inner tank 20, a connecting unit 30 and a supporting unit 40. The inner tank 20 is arranged in the outer tank 10 at intervals; the connecting unit 30 comprises a plurality of connecting assemblies 300 arranged at intervals around the circumference of the inner tank 20, and the connecting assembly 300 comprises two connecting rods 310, one end of the connecting rod 310 is movably connected to the outer wall of the inner tank 20, and the other end is movably connected to the inner wall of the outer tank 10, so that the inner tank 20 is supported on the inner wall of the outer tank 10; the supporting unit 40 is supported on the outer wall of the outer tank 10; wherein the two connecting rods 310 in the connecting assembly 300 are arranged opposite to each other, and the connecting rods 310 are arranged obliquely relative to the radial line of the inner tank 20, so as to limit the inner tank 20 from twisting relative to the outer tank 10.

[0036] The inner tank 20 and the outer tank 10 are arranged concentrically. The inner tank 20 can be made of austenitic stainless steel, aluminum alloy or titanium alloy that can withstand -253°C liquid hydrogen, and the outer tank 10 can be made of low-temperature carbon steel. Considering the convenience of construction in the annular space, the gap width between the inner tank 20 and the outer tank 10 can be 1.0-3.0m, and the gap between the inner tank 20 and the outer tank 10 is filled with an insulating material 50, which can be vacuum + expanded perlite filling, vacuum + glass microspheres, etc.

[0037] The supporting unit 40 includes an outer tank support 41, a support rod 42 and a foundation damper 43. There are multiple outer tank supports 41, and the multiple outer tank supports 41 are spaced apart on the circumference of 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 rod 42 is provided between two adjacent outer tank supports 41, and the foundation damper 43 is provided at the bottom of the outer tank support 41 to reduce the impact of horizontal seismic loads on the spherical tank and improve the seismic resistance of the tank system.

[0038] A plurality of connecting assemblies 300 can be evenly spaced around the inner tank 20 to ensure uniform force. The connecting rod 310 can be made of a metal material that can withstand the low temperature of liquid hydrogen. The two ends of the connecting rod 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, and the inner tank 20 is arranged at intervals in the outer tank 10. Since the connecting rod 310 is movably connected to the outer wall of the inner tank 20 and the inner wall of the outer tank 10, when the inner tank 20 shrinks in a cold state, it can be deformed freely in the radial direction of the spherical coordinates without being constrained. When the inner tank 20 shrinks or expands radially, the angle of the connecting rod 310 changes accordingly until it reaches a balanced state.

[0039] The two connecting rods 310 in each connecting assembly 300 are relatively arranged along one of the radial lines of the inner tank 20, and the connecting rods 310 are inclined relative to the radial line, so that the two connecting rods 310 in the connecting assembly 300 can form an "eight" shape. Under the action of seismic load, when the inner tank 20 is twisted, the tension of the connecting rod 310 will generate a tangential tension component to offset the rotational inertia force component of the inner tank 20, thereby limiting the twisting of the inner tank 20 relative to the outer tank 10 and reducing the failure risk of the spherical tank.

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

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

[0042] Of course, in other embodiments, the opening formed by the two connecting rods 310 may also face the outer tank 10, which is not limited thereto.

[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 part and the lower part between the inner tank 20 and the outer tank 10 .

[0044] The connection unit 30 is arranged in the gap between the inner tank 20 and the outer tank 10. The upper part between the inner tank 20 and the outer tank 10 is the part above the equator of the inner tank 20 and the outer tank 10, and the lower part between the inner tank 20 and the outer tank 10 is the part below the equator of the inner tank 20 and the outer tank 10. At least one connection unit 30 is arranged at the upper and lower parts of the gap, which can ensure the uniformity of the supporting force of the inner tank 20 and improve the supporting effect of the outer tank 10 on the inner tank 20. Of course, one, two or more connection units 30 can be arranged at the upper and lower parts of the gap, respectively, and there is no limitation to this.

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

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

[0047] That is, for the same connecting rod 310, there is a difference between 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 in the vertical plane, and the height difference can be determined according to the expansion displacement of the inner tank 20 at low temperature and high temperature to ensure 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, there is also a difference between 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 in the horizontal direction.

[0048] Under normal working conditions, when the inner tank 20 is refilled with liquid hydrogen, the inner tank 20 will shrink radially. When the inner tank 20 is empty, the temperature rise causes the inner tank 20 to expand radially. Since the connecting rod 310 has differences in both the horizontal and vertical directions, the free shrinkage of the inner tank 20 can be guaranteed to be unconstrained, which will not cause excessive local stress at the tank wall connection position.

[0049] In some embodiments, in combination 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 which are relatively arranged at both ends of the connecting portion 313, and the first movable portion 311 and the second movable portion 312 both 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 can be hinged to the other end of the first hinge seat 311a rotatably around a first direction, and one end of the connecting portion 313 can be hinged to the other end of the second hinge seat 311b rotatably 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, one end of the second hinge seat 311b can be hinged to the other end of the first hinge seat 311a rotatably around a first direction, and the other end of the connecting portion 313 can be hinged to the other end of the second hinge seat 311b rotatably around a second direction; wherein the first direction and the second direction are perpendicular.

[0050] The first movable part 311 and the second movable part 312 each have two hinge points, that is, two rotational degrees of freedom. Specifically, the second direction is parallel to the axis direction of the inner tank 20 and the outer tank 10. Under the action of horizontal seismic load, the inner tank 20 will move horizontally relative to the outer tank 10 under the action of inertia. Under this condition, the connecting rod 310 will limit the horizontal displacement of the spherical shell of the inner tank 20, and the tension of all connecting rods 310 will produce a resultant force component opposite to the horizontal movement direction, offsetting the action of inertia.

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

[0052] To further explain the principle of the connection assembly 300 of the embodiment of the present application to limit the rotation of the inner tank 20 relative to the outer tank 10, the following is combined with Figure 2 The force of one of the connection units 30 is taken as an example for description. For the convenience of description, the two connection rods 310 in the connection unit 30 are respectively named as the first connection rod 310a and the second connection rod 310b. In the first connection rod 310a, the hinge points on the two second hinge seats 311b are respectively named as the first hinge point 310c and the second hinge point 310d; in the second connection rod 310b, the hinge points on the two second hinge seats 311b are respectively named as the third hinge point 310e and the fourth hinge point 310f:

[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 becomes smaller, the first connecting rod 310a is in a relaxed state, and is not subjected to force, so the first connecting rod 310a has 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 becomes smaller, the second connecting rod 310b is in a tension state, and the second connecting rod 310b will generate a pulling force on the inner tank 20, decomposing the pulling force into two components, one of which is the tangential direction of the connection point of the inner tank 20, and the other is the radial direction of the connection point of the inner tank 20. The tangential component can prevent the clockwise rigid rotation of the inner tank 20, and the radial component can prevent the radial rigid displacement of the inner tank 20.

[0054] Likewise, when the inner tank 20 rotates counterclockwise, the force applied to the connecting rod 310 is opposite to the above situation.

[0055] In some embodiments, in order 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 elastic 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, the threaded elastic joint 313c is threadedly connected 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] Since the thread directions of the first connecting rod 313a and the second connecting rod 313b are opposite, when the threaded locking joint is rotated, the first connecting rod 313a and the second connecting rod 313b can be screwed into or out of the threaded elastic joint 313c at the same time to adjust the total length of the connecting rod 310. When installing the inner tank 20, the threaded elastic joint 313c can be adjusted to coincide with the spherical center of the inner tank 20 and the spherical center of the outer tank 10, so that the inner tank 20 and the outer tank 10 are arranged concentrically to prevent the gap between the inner tank 20 and the outer tank 10 from being uneven, resulting in excessive deviation of the insulation space. Of course, after the adjustment is completed, the two ends of the threaded elastic joint 313c can be welded and fixed to the first connecting rod 313a and the second connecting rod 313b respectively to prevent the threaded connection from loosening under low temperature conditions.

[0057] In some embodiments, since the thermal conductivity of the connecting rod 310 is relatively large, in order to reduce the amount of cold lost through the connecting rod 310, the connecting rod 310 also includes a third connecting rod 313d and a cold isolation block 314, the third connecting rod 313d is connected to the second hinge seat 311b of the first movable part 311, and the cold isolation 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, and the metal material has a strong thermal conductivity. Therefore, a cold isolation block 314 is provided in the connecting rod 310 to prevent the suspension rod from transferring the cold of the inner tank 20 and the annular gap to the outer tank 10 to a certain extent.

[0059] In some embodiments, the cold isolation block 314 includes a cold isolation block body 314a, connecting bolts 314c, connecting nuts 314d, and connecting plates 314b arranged on both sides of the cold isolation 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 isolation block body 314a and the connecting plates 314b are connected by connecting bolts 314c and connecting nuts 314d.

[0060] The cold block body 314a is made of a solid heat-insulating material 50 that can withstand low-temperature 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. When the connecting bolt 314c is tightened, the connecting nut 314d can be welded and fixed to the connecting bolt 314c to prevent the threaded connection from loosening under low temperature conditions.

[0061] In addition, a cold-insulating sleeve 314e may be provided at the bolt hole of the connecting plate 314b to reduce the contact 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 filled between the inner tank 20 and the outer tank 10 will also transfer cold to the connecting rod 310. If the cold insulation block 314 is installed close to the inner tank 20, the insulation material 50 will transfer more cold to the part of the connecting rod 310 close to the outer tank 10, thereby causing the temperature of the outer tank 10 to be too low. The material of the outer tank 10 cannot withstand low temperatures, so the cold insulation block 314 should be arranged as close to the outer tank 10 as possible.

[0064] The present application provides a double-layer liquid hydrogen spherical tank 1. Since the two connecting rods 310 in the connecting assembly 300 are arranged relatively to each other and the connecting rods 310 are arranged obliquely relative to the radial line of the inner tank 20, when the inner tank 20 is twisted under the action of seismic load, the tension of the connecting rod 310 will generate a tangential tension component to offset the rotational inertia force component of the inner tank 20, thereby limiting the twisting of the inner tank 20 relative to the outer tank 10 and reducing the failure risk of the spherical tank.

[0065] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

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

Claims

1. A double-layer liquid hydrogen spherical tank, characterized in that: include: An outer tank and an inner tank, wherein the inner tank is spaced apart and arranged in the outer tank; A connecting unit, comprising a plurality of connecting assemblies spaced around the circumference of the inner tank, wherein the connecting assemblies include two connecting rods, one end of the connecting rods being movably connected to the outer wall of the inner tank and the other end of the connecting rods being 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; A supporting unit, supported on the outer wall of the outer tank; Wherein, the two connecting rods in the connecting assembly are arranged opposite to each other, and the connecting rods are arranged obliquely relative to the radial line of the inner tank to limit the torsion of the inner tank relative to the outer tank.

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

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

4. The double-layer liquid hydrogen spherical tank according to claim 1 is characterized in that: At least one connecting unit is disposed at each of the upper portion and the lower portion between the inner tank and the outer tank.

5. The double-layer liquid hydrogen spherical tank according to claim 1 is characterized in that: There is a height difference between a connection point between the connection rod and the outer tank and a connection point between the connection rod and the inner tank.

6. The double-layer liquid hydrogen spherical tank according to any one of claims 1 to 5, characterized in that: The connecting rod comprises a connecting portion and a first movable portion and a second movable portion which are arranged at two ends of the connecting portion, and the first movable portion and the second movable portion both comprise 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 hinged to the other end of the first hinge seat rotatably around the first direction, and one end of the connecting part is hinged to the other end of the second hinge seat rotatably around the 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 hinged to the other end of the first hinge seat rotatably around the first direction, and the other end of the connecting part is hinged to the other end of the second hinge seat rotatably around the second direction; The first direction is perpendicular to the second direction.

7. The double-layer liquid hydrogen spherical tank according to claim 6 is 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, the second connecting rod is connected to the second hinge seat of the second movable part, the threaded tension joint is threadedly connected 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.

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

9. The double-layer liquid hydrogen spherical tank according to claim 8 is characterized in that: The cold isolation block includes a cold isolation block body, connecting bolts, connecting nuts and connecting plates arranged on both sides of the cold isolation block body. The two connecting plates are respectively connected to the first connecting rod and the third connecting rod. The cold isolation block body and the connecting plates are connected by the connecting bolts and the connecting nuts.

10. The double-layer liquid hydrogen spherical tank according to claim 8 is characterized in that: The cold insulation block is arranged close to the inner wall of the outer tank.

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