A liquid hydrogen cylinder

Abstract

This invention relates to the field of liquid hydrogen storage technology, specifically to a liquid hydrogen cylinder, comprising a support structure for supporting an inner liner and an outer liner that are nested together. The support structure includes: a first tube connected at both ends to the inner liner and the outer liner respectively; at least one second tube fitted over the first tube, with a gap between the second and first tubes, and the second end of the second tube connected to the outer liner, while the first end is not in contact with the inner liner; the inner liner has a first inlet and a first outlet, and the outer liner has a second inlet and a second outlet, connected by an inlet pipe and an outlet pipe; at least one third tube fitted over the inlet and outlet pipes, with a gap between the third tube and the inlet and outlet pipes, and the third tube connected to the outer liner but not in contact with the inner liner. This invention provides a liquid hydrogen cylinder with high mechanical strength and low heat leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid hydrogen storage, in particular to a liquid hydrogen cylinder. BACKGROUND

[0002] The hydrogen capacity density is three times that of kerosene, and the volume energy density is five times that of kerosene, so that the application research of hydrogen has become one of the hotspots at present, and the liquid hydrogen cylinder for vehicles is the most core key equipment. The liquid hydrogen cylinder for vehicles has strict requirements on the heat insulation performance and maintenance time, for example, the liquid hydrogen cylinder for vehicles requires that hydrogen cannot be discharged at least for three days, which requires that the heat leakage of the liquid hydrogen cylinder be controlled below 10W, so that the contact area of the structure in contact with the liquid hydrogen cylinder needs to be reduced, for example, the contact area of the support structure, which undoubtedly reduces the mechanical strength of the liquid hydrogen cylinder itself. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to overcome the defects that the mechanical strength and heat leakage of the liquid hydrogen cylinder in the prior art cannot be considered, so as to provide a liquid hydrogen cylinder with high mechanical strength and low heat leakage.

[0004] To solve the above technical problems, the present application provides a liquid hydrogen cylinder, comprising a support structure for supporting an inner container and an outer container which are arranged in each other, the support structure comprising:

[0005] a first pipe body connected to the inner container and the outer container at both ends;

[0006] at least one second pipe body arranged outside the first pipe body, a gap being reserved between the second pipe body and the first pipe body, and a second end of the second pipe body being connected to the outer container and a first end being arranged in non-contact with the inner container;

[0007] a first liquid inlet and a first liquid outlet are arranged on the inner container, a second liquid inlet and a second liquid outlet are arranged on the outer container, the first liquid inlet and the second liquid inlet are communicated through a liquid inlet pipe, the first liquid outlet and the second liquid outlet are communicated through a liquid outlet pipe, at least one third pipe body is arranged on the liquid inlet pipe and the liquid outlet pipe, a gap is reserved between the third pipe body and the liquid inlet pipe and the liquid outlet pipe, and the third pipe body is connected to the outer container and arranged in non-contact with the inner container; a rod body is arranged on the axis of the first pipe body, one end of the rod body is connected to the head of the inner container, and the other end is connected to the end plate of the first pipe body.

[0008] Optionally, the second pipe body comprises two concentrically arranged second pipe bodies, and a gap is reserved between the two second pipe bodies.

[0009] Optionally, the end portions of the first pipe body and the second pipe body are connected by a sealing plate.

[0010] Optionally, the first end of the first pipe body is connected with the head of the inner container, and the second ends of the first pipe body and the second pipe body extend to the outside of the outer container.

[0011] Optionally, the third pipe body comprises three concentrically arranged third pipe bodies, and a gap is reserved between two adjacent third pipe bodies.

[0012] Optionally, the liquid inlet pipe and the liquid outlet pipe are respectively provided with a first valve and a second valve, the connection between the first valve and the liquid inlet pipe and the connection between the second valve and the liquid outlet pipe are located in the vacuum cavity formed between the inner container and the outer container, and the operating ends of the first valve and the second valve are located outside the outer container.

[0013] Optionally, the inner container is made of carbon fiber material, and the outer container is made of aluminum alloy material.

[0014] The technical scheme of the present application has the following advantages:

[0015] 1. The liquid hydrogen cylinder provided by the present application connects the inner container and the outer container through the first pipe body to ensure the mechanical strength of the support structure and reduce the weight, and at least one second pipe body is arranged on the side of the first pipe body close to the outer container, and the second pipe body is arranged in non-contact with the inner container, so that the mechanical strength of the support structure is further improved, the contact area with the inner container is reduced, the flow path of the gas between the inner container and the outer container is prolonged, that is, the thermal bridge is prolonged, and the heat leakage is reduced.

[0016] 2. The liquid hydrogen cylinder provided by the present application further improves the mechanical strength of the support structure by arranging the rod body in the first pipe body, and prevents the relative rotation between the inner container and the outer container, thereby ensuring the stability of the structure.

[0017] 3. The liquid hydrogen cylinder provided by the present application further prolongs the flow path of the gas between the inner container and the outer container by arranging the third pipe body on the liquid inlet pipe and the liquid outlet pipe, that is, the thermal bridge is prolonged, thereby reducing the heat leakage; at the same time, the leaked gas can exchange heat with the gas in the liquid inlet pipe and the liquid outlet pipe to perform temperature compensation, thereby maximizing the utilization of energy.

[0018] 4. The liquid hydrogen cylinder provided by the present application saves the installation space by arranging the connection between the first valve and the liquid inlet pipe and the connection between the second valve and the liquid outlet pipe in the vacuum cavity formed between the inner container and the outer container, improves the cold insulation performance, and avoids the use of vacuum stop valve, thereby reducing the weight of the entire device.

[0019] 5. The liquid hydrogen cylinder provided by the present application is made of carbon fiber material for the inner container and aluminum alloy material for the outer container, and the overall weight is reduced by 30% to 40% compared with the traditional austenitic stainless steel inner container and outer container structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a liquid hydrogen cylinder provided by the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Inner liner; 2. Outer liner; 3. First tube body; 4. Second tube body; 5. End plate; 6. Rod body; 7. Sealing plate; 8. Vacuum chamber; 9. Insulation layer; 10. Inlet pipe; 11. Outlet pipe; 12. Third tube body; 13. First valve; 14. Second valve; 15. Pressure cover flange. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 One embodiment of the liquid hydrogen cylinder shown includes a support structure for supporting the space between an inner liner 1 and an outer liner 2 that are nested together, comprising a first tube 3 and two layers of second tubes 4.

[0027] The first end of the first tube 3 is connected to the end cap of the inner liner 1, and the second end is welded with an end plate 5, which extends to the outside of the outer liner 2. A rod 6 is provided on the axis of the first tube 3, one end of which is connected to the end cap of the inner liner 1, and the other end is connected to the end plate of the first tube 3.

[0028] Two layers of second tubes 4 are sequentially fitted around the first tube 3 from the inside out. Gaps are reserved between the second tubes 4 and the first tube 3, as well as between the two second tubes 4. The ends of the first tube 3 and the second tubes 4 are connected by a sealing plate 7. The second end of the second tube 4 is connected to the outer liner 2 and extends to the outside of the outer liner. The first end is not in contact with the inner liner 1.

[0029] The liquid hydrogen cylinder further comprises an inner container 1 and an outer container 2 which are sleeved with each other, the liquid hydrogen cylinder is in a horizontal structure, the inner container 1 is made of carbon fiber material, the outer container 2 is made of aluminum alloy material, a vacuum cavity 8 is formed between the inner container 1 and the outer container 2, and the support structure comprises a pair of structures arranged along the axial direction and arranged on the axis of the inner container 1 and the outer container 2.

[0030] In order to facilitate the filling and output of liquid hydrogen, a first liquid inlet and a first liquid outlet are arranged on the inner container 1 close to the bottom, a second liquid inlet and a second liquid outlet are arranged at the corresponding positions of the outer container 2, the first liquid inlet and the second liquid inlet are communicated through a liquid inlet pipe 10, the first liquid outlet and the second liquid outlet are communicated through a liquid outlet pipe 11, three third pipe bodies 12 are sleeved on the liquid inlet pipe and the liquid outlet pipe from the inside to the outside in sequence, a gap is reserved between the third pipe body 12 and the liquid inlet pipe and the liquid outlet pipe, a gap is reserved between the adjacent two third pipe bodies 12, the third pipe body 12 is connected with the outer container 2, and is arranged in a non-contact manner with the inner container 1.

[0031] In order to facilitate the control of the filling and output of liquid hydrogen, a first valve 13 is further communicated with the part of the liquid inlet pipe located in the vacuum cavity 8, a second valve 14 is further communicated with the part of the liquid outlet pipe located in the vacuum cavity 8, and the operating ends of the first valve 13 and the second valve 14 are located outside the outer container 2. The first valve 13 and the second valve 14 are arranged in an inclined manner in the vacuum cavity, and are connected with the outer container through a gland flange 15.

[0032] When it is needed to fill liquid hydrogen into the inner container 1, the first valve 13 communicated with the liquid inlet pipe is opened, the liquid hydrogen is injected into the inner container 1 through the liquid inlet pipe, and after being filled to a predetermined position, the first valve 13 is closed; when it is needed to supply hydrogen, the second valve 14 communicated with the liquid outlet pipe is opened, the liquid hydrogen in the inner container 1 flows out to a predetermined position through the liquid outlet pipe, and then the second valve 14 is closed.

[0033] The arrangement of the two-layer second pipe body 4 prolongs the heat bridge by 2.5 times, the arrangement of the three-layer third pipe body 12 increases the length of the heat bridge by about 3 times, and the problem of high heat leakage at the support of the liquid hydrogen cylinder is solved.

[0034] Obviously, the above embodiments are only examples for clearly illustrating, and are not limitations to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments do not need to be exhausted, and the changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A liquid hydrogen cylinder comprising a support structure for the support between an inner liner (1) and an outer liner (2) which are mutually nested, characterized in that, The support structure comprises: a first pipe body (3) connected with the inner container (1) and the outer container (2) at two ends respectively; at least one second pipe body (4) sleeved outside the first pipe body (3), a gap being reserved between the second pipe body (4) and the first pipe body (3), and a second end of the second pipe body (4) being connected with the outer container (2) and a first end being arranged in non-contact with the inner container (1); the inner container (1) is provided with a first liquid inlet and a first liquid outlet, the outer container (2) is provided with a second liquid inlet and a second liquid outlet, the first liquid inlet and the second liquid inlet are communicated through a liquid inlet pipe (10), the first liquid outlet and the second liquid outlet are communicated through a liquid outlet pipe (11), at least one third pipe body (12) is sleeved on the liquid inlet pipe (10) and the liquid outlet pipe (11), a gap is reserved between the third pipe body (12) and the liquid inlet pipe (10) and the liquid outlet pipe (11), the third pipe body (12) is connected with the outer container (2) and arranged in non-contact with the inner container (1); and a rod body (6) is arranged on an axis of the first pipe body (3), one end of the rod body (6) is connected with an end cover of the inner container (1), and the other end is connected with an end plate (5) of the first pipe body (3).

2. The liquid hydrogen cylinder of claim 1, wherein, The second pipe body (4) comprises two concentrically arranged second pipe bodies, and a gap is reserved between the two second pipe bodies.

3. The liquid hydrogen cylinder of claim 2, wherein, End portions of the first pipe body (3) and the second pipe body (4) are connected through a sealing plate (7).

4. The liquid hydrogen cylinder according to any one of claims 1 to 3, characterized in that, A first end of the first pipe body (3) is connected with an end cover of the inner container (1), and second ends of the first pipe body (3) and the second pipe body (4) are extended to outside of the outer container (2).

5. The liquid hydrogen cylinder of claim 1, wherein, The third pipe body (12) comprises three concentrically arranged third pipe bodies, and a gap is reserved between adjacent two third pipe bodies (12).

6. The liquid hydrogen cylinder of claim 1, wherein, The support structure further comprises a first valve (13) communicated with the liquid inlet pipe (10) and a second valve (14) communicated with the liquid outlet pipe (11), the connection positions of the first valve (13) and the second valve (14) with the liquid inlet pipe (10) and the liquid outlet pipe (11) are located in a vacuum cavity (8) formed between the inner container (1) and the outer container (2), and operation ends of the first valve (13) and the second valve (14) are located outside of the outer container (2).

7. The liquid hydrogen cylinder according to claim 5 or 6, characterized by The inner container (1) is made of carbon fiber material, and the outer container (2) is made of aluminum alloy material.

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