Double-wall liquid hydrogen container and manufacturing method

Abstract

The invention provides a double-wall liquid hydrogen container and a manufacturing method, relates to the technical field of hydrogen energy storage equipment, and solves the technical problem of heavy self weight of a low-temperature hydrogen storage container in the prior art. The device comprises a container body, the container body is of a double-layer shell structure, and the container body is made of epoxy resin-based carbon fiber composite prepreg.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy storage equipment, and in particular to a double-walled liquid hydrogen container and a manufacturing method thereof. Background Art

[0002] At present, the materials commonly used for low-temperature hydrogen storage containers are stainless steel, aluminum alloy, ceramics, etc. For strength and safety reasons, the container wall thickness is relatively thick, which increases the deadweight of such containers. The most important thing is the support parts connecting the inner and outer containers, which are generally made of light metal with high thermal conductivity. In this way, the heat from the external environment can easily be transferred to the inner tank through these support parts (thermal bridge), greatly affecting the insulation effect. Summary of the invention

[0003] The purpose of the present invention is to provide a double-walled liquid hydrogen container and a manufacturing method to solve the technical problem of the relatively heavy weight of low-temperature hydrogen storage containers in the prior art. The preferred technical solutions among the many technical solutions provided by the present invention can produce a number of technical effects as described below.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a double-walled liquid hydrogen container, comprising a container body, wherein the container body is a double-layer shell structure, and the material used for the container body is epoxy resin-based carbon fiber composite material prepreg.

[0006] Optionally, the container body includes an inner shell, an outer shell and an annular support, the inner shell is located inside the outer shell, the annular support is located between the inner shell and the outer shell, the outer wall of the inner shell and the inner wall of the outer shell are fixedly connected by the annular support, and the two ends of the inner shell are respectively connected to the two ends of the outer shell.

[0007] Optionally, the number of the annular support member is at least one, and a plurality of embedded holes are provided on the annular support member.

[0008] Optionally, the inner shell includes an inner cylinder and a head assembly, there are two head assemblies, the two head assemblies are respectively fixedly connected to the two ends of the inner cylinder, the annular support member surrounds the connection position between the inner cylinder and the head assembly, and the head assembly is fixedly connected to the end of the outer shell.

[0009] Optionally, the head assembly includes an inner head and a positioning tube, the open end of the inner head is fixedly connected to the end of the inner cylinder, the central end surface of the inner head is fixedly connected to the end of the positioning tube and a first through hole is provided in the central area of ​​the inner head, and the positioning tube is fixedly connected to the end of the outer cylinder.

[0010] Optionally, the outer shell includes an outer cylinder and an outer head, there are two outer heads, the two outer heads are respectively fixedly connected to the two ends of the outer cylinder, a second through hole is provided in the central area of ​​the outer head, and the second through hole is fixedly connected to the end of the inner shell.

[0011] The present invention provides a method for manufacturing a double-walled liquid hydrogen container, comprising the following steps:

[0012] Step S1: winding a strip of epoxy resin-based carbon fiber composite material prepreg on a corresponding core mold by a winding molding process, and then heating and demolding in a curing furnace to obtain an inner cylinder, a head assembly, an outer cylinder and an outer head;

[0013] Step S2: overlapping the open end of the head assembly on the outer side wall of the open end of the inner cylinder and bonding them with an adhesive, and then winding the bundled epoxy resin-based carbon fiber composite material prepreg around the joint between the head assembly and the inner cylinder by a winding molding process to form a preliminarily processed inner shell;

[0014] Step S3: winding the strip-shaped epoxy resin-based carbon fiber composite material prepreg on the pre-processed inner shell by a winding molding process, winding at least one layer, to form a reprocessed inner shell;

[0015] Step S4: winding multiple layers of strip-shaped epoxy resin-based carbon fiber composite material prepreg at the connection between the head assembly and the inner cylinder, and placing a pre-buried pipe on each layer to form a pre-processed annular support member;

[0016] Step S5: placing the reprocessed inner shell and the preprocessed annular support into an autoclave for curing to form an inner shell in which the inner shell and the annular support are cured together;

[0017] Step S6: placing the inner shell into the outer cylinder, the outer head is sleeved on the positioning tube on the head assembly, and then the open end of the outer cylinder is overlapped to the outer side wall of the open end of the outer head and bonded with an adhesive, and then the bundled epoxy resin-based carbon fiber composite material prepreg is wound around the joint between the outer head and the outer cylinder by a winding molding process to form a preliminarily processed container body;

[0018] Step S7: winding the strip-shaped epoxy resin-based carbon fiber composite material prepreg on the primary processing container body by a winding molding process, winding at least one layer, to form a reprocessed container body;

[0019] Step S8: placing the reprocessed container body into an autoclave for curing to form a product of the container body.

[0020] Optionally, in step S1, the number of winding layers, winding position and winding direction of the strip-shaped epoxy resin-based carbon fiber composite material prepreg are determined according to the designed thicknesses of the inner cylinder, the head assembly, the outer cylinder and the outer head.

[0021] Optionally, in step S2, a first annular groove is cut on the outer wall of the end of the inner cylinder;

[0022] When the two end cap assemblies are respectively overlapped to the two ends of the inner cylinder, the positioning tubes on the two end cap assemblies are centrally positioned.

[0023] Optionally, in step S6, a second annular groove is cut on the end of the annular support member on the inner shell;

[0024] In step S8, threads are machined on the positioning tube.

[0025] The present invention provides a double-walled liquid hydrogen container, in which the container body is a double-layer shell structure. The container body is manufactured by using epoxy resin-based carbon fiber composite material prepreg through a winding molding process and a thermal curing molding technology, so that the container has the basic characteristics of light weight, high strength, and good thermal insulation, and has high impact strength and good flame retardancy, meeting all safety requirements, and solving the technical problem of the relatively heavy weight of low-temperature hydrogen storage containers in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic structural diagram of a double-walled liquid hydrogen container provided by an embodiment of the present invention;

[0028] Figure 2 is a cross-sectional view of a double-walled liquid hydrogen container provided by an embodiment of the present invention;

[0029] Figure 3 It is a partial cross-sectional view during processing of a method for manufacturing a double-walled liquid hydrogen container provided in an embodiment of the present invention.

[0030] In the figure, 1 is the inner shell; 11 is the inner cylinder; 12 is the inner head; 13 is the positioning tube;

[0031] 2. Outer shell; 21. Outer cylinder; 22. Outer head;

[0032] 3. Annular support. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The present invention provides a double-walled liquid hydrogen container, including a container body, wherein the container body is a double-layer shell structure, and the material used for the container body is epoxy resin-based carbon fiber composite material prepreg. The present invention provides a double-walled liquid hydrogen container, wherein the container body is a double-layer shell structure, and the container body is manufactured by using epoxy resin-based carbon fiber composite material prepreg through a winding molding process and a thermal curing molding technology, so that it has the basic characteristics of light weight, high strength, and good thermal insulation, and has high impact strength and good flame retardancy, meeting all safety requirements, and solving the technical problem of the relatively heavy dead weight of low-temperature hydrogen storage containers existing in the prior art.

[0037] As an optional embodiment, the container body includes an inner shell 1, an outer shell 2 and an annular support 3. The inner shell 1 is located in the outer shell 2. There is a vacuum insulation cavity between the inner shell 1 and the outer shell 2. The vacuum insulation cavity will form a vacuum in order to achieve the effect of heat insulation between the inner shell 1 and the outer shell 2. The annular support 3 is located between the inner shell 1 and the outer shell 2. The outer wall of the inner shell 1 and the inner wall of the outer shell 2 are fixedly connected by the annular support 3. The annular support 3 is used to fix and limit the inner shell 1 and the outer shell 2. The two ends of the inner shell 1 are respectively connected to the two ends of the outer shell 2.

[0038] As an optional implementation, the number of the annular support member 3 is at least one, and a plurality of pre-buried holes are provided on the annular support member 3 to allow gas to circulate, thereby facilitating vacuuming of the vacuum insulation chamber.

[0039] As an optional embodiment, the inner shell 1 includes an inner cylinder 11 and a head assembly, there are two head assemblies, and the two head assemblies are respectively fixedly connected to the two ends of the inner cylinder 11. There are two annular support members 3, and the annular support members 3 surround the connection position between the inner cylinder 11 and the head assembly. The head assembly is fixedly connected to the end of the outer shell 2.

[0040] As an optional embodiment, the head assembly includes an inner head 12 and a positioning tube 13, the open end of the inner head 12 is fixedly connected to the end of the inner cylinder 11, the central end surface of the inner head 12 is fixedly connected to the end of the positioning tube 13, and the central area of ​​the inner head 12 is provided with a first through hole, and the positioning tube 13 is fixedly connected to the end of the outer shell 2. The number and diameter of the first through holes on the inner heads 12 in the two head assemblies may be different, the diameters of the positioning tubes 13 in the two head assemblies may be different, and the positioning tube 13 may be threadedly connected to the flange.

[0041] As an optional embodiment, the outer shell 2 includes an outer cylinder 21 and an outer head 22. There are two outer heads 22. The two outer heads 22 are fixedly connected to the two ends of the outer cylinder 21 respectively. A second through hole is provided in the central area of ​​the outer head 22. The second through hole is fixedly connected to the end of the inner shell 1. The diameters of the second through holes on the two outer heads 22 may be different. The second through holes are consistent with the diameters of the corresponding positioning tubes 13. The positioning tubes 13 pass through the corresponding second through holes and the positioning tubes 13 are fixedly connected to the second through holes.

[0042] The present invention provides a method for manufacturing a double-walled liquid hydrogen container, comprising the following steps:

[0043] Step S1: winding a strip-shaped epoxy resin-based carbon fiber composite material prepreg on a corresponding core mold by a winding molding process, that is, winding a plurality of strip-shaped epoxy resin-based carbon fiber composite material prepregs on an inner cylinder core mold, a head assembly core mold, an outer cylinder core mold and an outer head core mold according to a certain winding angle and winding position, and winding multiple layers, and then heating and demolding through a curing furnace to obtain an inner cylinder 11, a head assembly, an outer cylinder 21 and an outer head 22;

[0044] Step S2: overlap the open end of the head assembly on the outer side wall of the open end of the inner cylinder 11 and bond them with an adhesive, and then use a filament-shaped epoxy resin-based carbon fiber composite material prepreg to wrap the joint between the head assembly and the inner cylinder 11 by a winding molding process, so as to avoid air leakage at the connection between the head assembly and the inner cylinder 11, further enhance the sealing performance, and form a pre-processed inner shell;

[0045] Step S3: winding the strip-shaped epoxy resin-based carbon fiber composite material prepreg on the pre-processed inner shell by a winding molding process, winding at least one layer, to enhance the overall connectivity and form a reprocessed inner shell;

[0046] Step S4: wrapping multiple layers of strip-shaped epoxy resin-based carbon fiber composite material prepreg at the connection between the head assembly and the inner cylinder 11, and placing at least one embedded tube on each layer, that is, placing an embedded tube on each layer of strip-shaped epoxy resin-based carbon fiber composite material prepreg, so that the embedded tube is pressed by the epoxy resin-based carbon fiber composite material prepreg to form a pre-processed annular support member;

[0047] Step S5: placing the reprocessed inner shell and the preprocessed annular support into an autoclave for curing, so that the connection between the head assembly and the inner cylinder 11 forms an integrated structure, forming an inner shell in which the inner shell 1 and the annular support 3 are cured together;

[0048] Step S6: placing the inner shell into the outer cylinder 21, and the outer head 22 is sleeved on the positioning tube 13 on the head assembly, and the outer head 22 is positioned by the positioning tube 13, and then the open end of one outer cylinder 21 is overlapped to the outer side wall of the open end of the outer head 22 and bonded with an adhesive, and then the bundled epoxy resin-based carbon fiber composite material prepreg is wound around the joint between the outer head 22 and the outer cylinder 21 by a winding molding process, in order to avoid air leakage at the connection between the outer head 22 and the outer cylinder 21, and further enhance the sealing performance, and then the above operation is performed on another outer cylinder 21 and the outer head 22, and the bundled epoxy resin-based carbon fiber composite material prepreg can also be wound around the connection between the outer head 22 and the positioning tube 13 to form a preliminarily processed container body;

[0049] Step S7: winding the strip-shaped epoxy resin-based carbon fiber composite material prepreg on the primary processing container body by a winding molding process, winding at least one layer, to enhance the overall connectivity and form a secondary processing container body;

[0050] Step S8: Put the reprocessed container body into an autoclave for solidification, so that the connection between the outer cylinder 21 and the outer head 22 forms an integrated structure, forming a product of the container body.

[0051] As an optional implementation, in step S1, the number of winding layers, winding position and winding direction of the strip-shaped epoxy resin-based carbon fiber composite material prepreg are determined according to the designed thickness of the inner cylinder 11, the head assembly, the outer cylinder 21 and the outer head 22.

[0052] As an optional implementation, in step S2, a first annular groove is cut on the outer wall of the end of the inner cylinder 11 to facilitate the opening end of the head assembly to overlap the first annular groove;

[0053] When the two end cap assemblies are overlapped to the two ends of the inner cylinder 11 respectively, the positioning tubes 13 on the two end cap assemblies are centrally positioned.

[0054] As an optional implementation, in step S6, a second annular groove is cut on the end of the annular support member 3 on the inner shell 1 so that the opening end of the outer head 22 extends into the second annular groove;

[0055] In step S8, threads are processed on the positioning tube 13 to facilitate connection with the flange.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A double-walled liquid hydrogen container, characterized in that: comprising a container body, wherein The container body is a double-layer shell structure, and the material used for the container body is epoxy resin-based carbon fiber composite material prepreg.

2. The double-walled liquid hydrogen container according to claim 1, characterized in that: The container body comprises an inner shell (1), an outer shell (2) and an annular support member (3); the inner shell (1) is located inside the outer shell (2); the annular support member (3) is located between the inner shell (1) and the outer shell (2); the outer wall of the inner shell (1) and the inner wall of the outer shell (2) are fixedly connected via the annular support member (3); and the two ends of the inner shell (1) are respectively connected to the two ends of the outer shell (2).

3. The double-walled liquid hydrogen container according to claim 2, characterized in that: The number of the annular support member (3) is at least one, and a plurality of embedded holes are provided on the annular support member (3).

4. The double-walled liquid hydrogen container according to claim 2, characterized in that: The inner shell (1) comprises an inner cylinder (11) and a head assembly, wherein there are two head assemblies, and the two head assemblies are respectively fixedly connected to the two ends of the inner cylinder (11), and the annular support member (3) surrounds the connection position between the inner cylinder (11) and the head assembly, and the head assembly is fixedly connected to the end of the outer shell (2).

5. The double-walled liquid hydrogen container according to claim 4, characterized in that: The head assembly comprises an inner head (12) and a positioning tube (13); the open end of the inner head (12) is fixedly connected to the end of the inner cylinder (11); the central end surface of the inner head (12) is fixedly connected to the end of the positioning tube (13); and a first through hole is provided in the central area of ​​the inner head (12); and the positioning tube (13) is fixedly connected to the end of the outer shell (2).

6. The double-walled liquid hydrogen container according to claim 2, characterized in that: The outer shell (2) comprises an outer cylinder (21) and an outer seal (22), there are two outer seals (22), the two outer seals (22) are respectively fixedly connected to the two ends of the outer cylinder (21), a second through hole is provided in the central area of ​​the outer seal (22), and the second through hole is fixedly connected to the end of the inner shell (1).

7. A method for manufacturing a double-walled liquid hydrogen container according to any one of claims 1 to 6, characterized in that: The steps include: Step S1: winding a strip of epoxy resin-based carbon fiber composite material prepreg on a corresponding core mold by a winding molding process, and then heating and demoulding in a curing furnace to obtain an inner cylinder (11), a head assembly, an outer cylinder (21) and an outer head (22); Step S2: overlapping the open end of the head assembly on the outer side wall of the open end of the inner cylinder (11) and bonding them with an adhesive, and then winding the epoxy resin-based carbon fiber composite material prepreg in a bundle shape around the joint between the head assembly and the inner cylinder (11) by a winding molding process to form a pre-processed inner shell; Step S3: winding the strip-shaped epoxy resin-based carbon fiber composite material prepreg on the pre-processed inner shell by a winding molding process, winding at least one layer, to form a reprocessed inner shell; Step S4: winding multiple layers of strip-shaped epoxy resin-based carbon fiber composite material prepreg at the connection between the head assembly and the inner cylinder (11), and placing a pre-buried pipe on each layer to form a pre-processed annular support member; Step S5: placing the reprocessed inner shell and the preprocessed annular support into an autoclave for curing, thereby forming an inner shell in which the inner shell (1) and the annular support (3) are cured together; Step S6: placing the inner shell into the outer cylinder (21), sleeve the outer end cap (22) on the positioning tube (13) on the end cap assembly, overlap the open end of the outer cylinder (21) with the outer side wall of the open end of the outer end cap (22) and bond them with an adhesive, and then wrap the bundled epoxy resin-based carbon fiber composite material prepreg around the joint between the outer end cap (22) and the outer cylinder (21) using a winding molding process to form a primary processed container body; Step S7: winding the strip-shaped epoxy resin-based carbon fiber composite material prepreg on the primary processing container body by a winding molding process, winding at least one layer, to form a reprocessed container body; Step S8: placing the reprocessed container body into an autoclave for curing to form a product of the container body.

8. The method according to claim 7, characterized in that: In step S1, the number of winding layers, the winding position and the winding direction of the strip-shaped epoxy resin-based carbon fiber composite material prepreg are determined according to the designed thicknesses of the inner cylinder (11), the head assembly, the outer cylinder (21) and the outer head (22).

9. The manufacturing method according to claim 7, characterized in that: In step S2, a first annular groove is cut on the outer wall of the end of the inner cylinder (11); When the two end cap assemblies are respectively overlapped onto the two ends of the inner cylinder (11), the positioning tubes (13) on the two end cap assemblies are centrally positioned.

10. The manufacturing method according to claim 7, characterized in that: In step S6, a second annular groove is cut on the end of the annular support member (3) on the inner shell (1); In step S8, threads are machined on the positioning tube (13).

Images