Hydrogen storage cylinder structure and manufacturing method

Abstract

The invention relates to the technical field of hydrogen storage devices, in particular to a hydrogen storage cylinder structure and a manufacturing method.The hydrogen storage cylinder structure comprises a cylinder core mold, the cylinder core mold is provided with a hollow gas storage cavity, and a through hole is formed in the end of the cylinder core mold; the inner wall support is of a cylindrical net-shaped structure, the inner wall support is arranged in the air storage cavity, the inner wall support extends in the axial direction of the air cylinder core mold, and the inner wall support is configured to be arranged on an air bag in a sleeving mode, and in the air inflation process of the air bag, the inner wall support is stressed to deform in the radial direction, so that the inner wall support is located in the air storage cavity. The state is changed from a contraction state to a fixed supporting state by being unfolded to be attached to the inner wall surface of the gas storage cavity of the gas cylinder core mold; and the winding layer is fixedly arranged on the peripheral surface of the gas cylinder core mold in a winding manner. The deformation problem of the hydrogen storage cylinder in the production process can be solved, the process difficulty is reduced, and the fatigue life of the hydrogen storage cylinder is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage devices, and in particular to a hydrogen storage cylinder structure and a manufacturing method. Background Art

[0002] There are four types of hydrogen storage cylinders: all-metal cylinders (Type I), metal liner fiber hoop-wrapped cylinders (Type II), metal liner fiber fully wrapped cylinders (Type III) and non-metal liner fiber fully wrapped cylinders (Type IV). Type I and Type II cylinders are relatively heavy and difficult to meet the unit mass hydrogen storage density requirements. Compared with Type III cylinders, Type IV cylinders generally use a non-metallic liner such as plastic and carbon fiber winding manufacturing method, which makes the cylinders lighter, lower cost, and higher mass hydrogen storage density.

[0003] Type IV gas cylinders are in the manufacturing process. Usually, tension is applied to the carbon fiber during the winding stage to ensure that the fiber is always in a tensioned state and to ensure that the fiber strength is exerted. During the cylinder winding stage, the inflation method is usually used, that is, the plastic liner is filled with inert gas that matches the winding tension to support the liner and avoid deformation. During the curing stage of the cylinder, in order to ensure that the fiber is always in a tensioned state during the release of the internal stress of the winding layer, the cylinder will still be inflated. During the manufacturing process, the surface of the liner will be treated with surface treatment (plasma treatment / brush glue) to make the liner and the winding layer tightly bonded to ensure that the deformation of the two is consistent and avoid the liner rupture and failure due to different deformation. However, the process of bonding the liner and the winding layer by surface treatment / brush glue is complicated, the stability is not good, and the uniformity of the surface treatment is not guaranteed. Part of the liner surface may be separated from the winding layer. In addition, the rigidity of the plastic liner is low, and the liner will inevitably deform when it is wound under high tension; during the curing stage, the resin of the winding layer softens when heated, releasing the internal stress of the winding layer, and the wound Type IV gas cylinder will shrink and deform. During use. The gas cylinder will be constantly inflated and deflated (pressure increase and decrease), and the cylinder will expand and shrink as a whole. However, the components of the gas cylinder, such as the liner, valve seat, and winding layer, have different moduli and different deformation amounts after being compressed. Under the fatigue conditions of inflation and deflation, the liner is prone to rupture and failure.

[0004] Therefore, a hydrogen storage cylinder structure and a manufacturing method are needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a hydrogen storage cylinder structure and a manufacturing method, which can solve the deformation problem of the hydrogen storage cylinder during the production process, reduce the process difficulty, and increase the fatigue life of the hydrogen storage cylinder.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The hydrogen storage cylinder structure includes:

[0008] A gas cylinder core mold, wherein the gas cylinder core mold has a hollow gas storage cavity, and a through hole is opened at the end of the gas cylinder core mold;

[0009] An inner wall bracket, wherein the inner wall bracket is a cylindrical mesh structure, the inner wall bracket is arranged in the gas storage cavity, and the inner wall bracket extends along the axial direction of the gas cylinder core mold, and the inner wall bracket is configured as: being sleeved on the airbag, during the inflation of the airbag, the inner wall bracket is deformed by force in the radial direction, and is expanded from a contracted state to be in contact with the inner wall surface of the gas storage cavity of the gas cylinder core mold to a fixed support state;

[0010] The winding layer is fixedly wound on the outer peripheral surface of the gas cylinder core mold.

[0011] Furthermore, the inner wall bracket is woven by a plurality of woven parts to form a mesh structure, and a ratchet structure is provided at the hinged nodes of the woven parts, so that the inner wall bracket can only change from a contracted state to a fixed support state in one direction.

[0012] Furthermore, the ratchet structure includes a ratchet and a rotating shaft, wherein an annular ratchet groove is opened on one of the woven parts, the ratchet is fixedly set on the other woven part, the rotating shaft is set at the hinge of the two woven parts and is located in the annular ratchet groove, and the ratchet and the annular ratchet groove cooperate to achieve unidirectional rotation.

[0013] Furthermore, an adhesive layer is coated on the inner wall bracket, and the inner wall bracket is bonded to the inner wall of the air storage cavity through the adhesive layer.

[0014] Furthermore, the mesh of the inner wall support is hexagonal or rhombus-shaped.

[0015] Furthermore, a support ring is provided on the gas cylinder core mold.

[0016] Furthermore, a plurality of the support rings are arranged at intervals along the axial direction of the gas cylinder core mold.

[0017] Furthermore, the support ring and the gas cylinder core mold are integrally injection molded.

[0018] Furthermore, a connecting joint is fixedly provided on the gas cylinder core mold, the connecting joint is located at the through hole, and the connecting joint protrudes relative to the through hole.

[0019] A manufacturing method for manufacturing the hydrogen storage cylinder structure as described above comprises the following steps:

[0020] S1, soaking the inner wall bracket in adhesive liquid;

[0021] S2, sleeve the inner wall bracket on the airbag;

[0022] S3, inserting the inner wall bracket and the air bag into the gas storage cavity of the gas cylinder core mold through the through hole;

[0023] S4, inflating the airbag so that the inner wall bracket is expanded in a contracted state as the airbag expands, until the inner wall bracket is in contact with the inner wall surface of the air storage cavity of the gas cylinder core mold, and then stopping inflating the airbag;

[0024] S5, deflating the airbag and taking the airbag out of the air storage cavity;

[0025] S6, winding a wrapping layer on the outer circumferential surface of the gas cylinder core mold along the circumference of the gas cylinder core mold;

[0026] S7, curing the winding layer to form a gas storage cylinder.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides a hydrogen storage gas cylinder structure, wherein the gas cylinder core mold has a hollow gas storage cavity, and an inner wall bracket with a cylindrical mesh structure is arranged in the gas storage cavity. The inner wall bracket can be expanded from a contracted state to a fixed support state by the action of the airbag inflation and expansion, and fit with the inner wall surface of the gas storage cavity of the gas cylinder core mold, thereby supporting the gas cylinder core mold, and then a winding layer is wound. By arranging the inner wall bracket, the gas cylinder core mold can be effectively supported, thereby preventing the deformation problem of the hydrogen storage gas cylinder during the production process. After use, the airbag can be taken out when it is deflated. By using the airbag, it is convenient to place and fix the inner wall bracket, and there is no need to inflate the gas cylinder core mold in each link of the gas storage cylinder production, and there is no need to consider whether the inflation pressure matches the winding tension of the winding layer and other factors, thereby reducing the process difficulty. In addition, by arranging the inner wall bracket and the winding layer, the strength of the hydrogen storage gas cylinder structure is improved, and the fatigue life of the hydrogen storage gas cylinder structure is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a hydrogen storage cylinder structure of the present invention;

[0030] Figure 2 It is a schematic diagram of an inner wall bracket in a hydrogen storage cylinder structure of the present invention;

[0031] Figure 3 It is a schematic diagram of a ratchet structure in a hydrogen storage cylinder structure of the present invention;

[0032] Figure 4 It is a flow chart of a manufacturing method of the present invention.

[0033] In the figure:

[0034] 1. Gas cylinder core mold; 11. Connecting joint; 12. Support ring; 2. Inner wall bracket; 21. Airbag; 22. Mesh; 23. Braided piece; 3. Wrapping layer; 4. Ratchet structure; 41. Ratchet teeth; 42. Annular ratchet groove; 43. Rotating shaft. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable 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, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the process of manufacturing hydrogen storage cylinders, in order to solve the deformation problem of hydrogen storage cylinders in the production process, reduce the process difficulty, and increase the fatigue life of hydrogen storage cylinders, such as Figure 1-Figure 3 As shown, the present invention provides a hydrogen storage gas cylinder structure. The hydrogen storage gas cylinder structure includes a gas cylinder core mold 1, an inner wall bracket 2 and a winding layer 3.

[0039] Among them, the gas cylinder core mold 1 has a hollow air storage cavity, and a through hole is opened at the end of the gas cylinder core mold 1; the inner wall bracket 2 is a cylindrical mesh structure, the inner wall bracket 2 is arranged in the air storage cavity, and the inner wall bracket 2 extends along the axial direction of the gas cylinder core mold 1, and the inner wall bracket 2 is configured as: it is sleeved on the airbag 21, and during the inflation of the airbag 21, the inner wall bracket 2 is deformed by force in the radial direction, and is expanded from a contracted state to a fixed support state in contact with the inner wall surface of the air storage cavity of the gas cylinder core mold 1; the winding layer 3 is fixedly wrapped on the outer circumferential surface of the gas cylinder core mold 1.

[0040] By providing the inner wall bracket 2, the gas cylinder core mold 1 can be effectively supported, thereby preventing the hydrogen storage gas cylinder from being deformed during the production process. The airbag 21 can be taken out after being deflated after use. By using the airbag 21, it is convenient to place and fix the inner wall bracket 2. There is no need to inflate the gas cylinder core mold 1 in each link of the gas storage cylinder production, and there is no need to consider whether the inflation pressure matches the winding tension of the winding layer 3 and other factors, thereby reducing the process difficulty. In addition, by providing the inner wall bracket 2 and the winding layer 3, the strength of the hydrogen storage gas cylinder structure is improved, and the fatigue life of the hydrogen storage gas cylinder structure is improved.

[0041] Furthermore, the inner wall bracket 2 is woven with a plurality of woven pieces 23 to form a mesh structure, and a ratchet structure 4 is provided at the hinged nodes of the woven pieces 23, so that the inner wall bracket 2 can only change from a contracted state to a fixed support state in one direction. Through the above arrangement, during the process of inflation using the airbag 21, the inner wall bracket 2 is deformed, and due to the provision of a ratchet mechanism, the inner wall bracket 2 is unidirectionally unfolded and maintained in an unfolded state. Even if the airbag 21 is subsequently deflated and taken out, the inner wall bracket 2 will not retract, thereby effectively supporting the gas cylinder core mold 1 and ensuring that the strength of the gas cylinder core mold 1 meets the requirements for charging and discharging hydrogen.

[0042] Further, the ratchet structure 4 includes a ratchet 41 and a rotating shaft 43, wherein an annular ratchet groove 42 is provided on one of the braided pieces 23, the ratchet 41 is fixedly arranged on the other braided piece 23, the rotating shaft 43 is arranged at the hinge of the two braided pieces 23 and is located in the annular ratchet groove 42, and the ratchet 41 cooperates with the annular ratchet groove 42 to realize unidirectional rotation. The inner wall bracket 2 is unidirectionally unfolded by the cooperation of the ratchet 41 and the annular ratchet groove 42. By setting the rotating shaft 43, the smoothness and stability of the rotation and unfolding can be guaranteed.

[0043] Furthermore, an adhesive layer is coated on the inner wall bracket 2, and the inner wall bracket 2 is bonded to the inner wall of the gas storage cavity through the adhesive layer. By providing the adhesive layer, after the inner wall bracket 2 is unfolded to a fixed support state, the inner wall bracket 2 is bonded to the gas cylinder core mold 1, thereby playing the role of fixing the inner wall bracket 2.

[0044] Furthermore, the mesh 22 of the inner wall bracket 2 is hexagonal or rhombus-shaped. Taking advantage of the easy deformation of rhombus and hexagon, during the expansion of the airbag 21, the inner wall bracket 2 becomes larger in radial direction and shorter in axial direction, thereby achieving the fitting connection between the inner wall bracket 2 and the cylinder core mold 1.

[0045] Furthermore, a support ring 12 is fixedly provided on the gas cylinder core mold 1. Specifically, in the present embodiment, the support ring 12 is a steel support ring, which is embedded in the gas cylinder core mold 1. By placing the support ring 12 in the gas cylinder core mold 1, the strength of the gas cylinder core mold 1 can be improved, thereby ensuring that the gas cylinder core mold 1 does not deform during the hydrogen filling process, and the service life of the hydrogen storage cylinder can be extended.

[0046] Furthermore, a plurality of support rings are arranged at intervals along the axial direction of the gas cylinder core mold 1. Through the above arrangement, the strength of the hydrogen storage gas cylinder can be further improved.

[0047] Furthermore, the support ring 12 is integrally injection molded with the gas cylinder core mold 1. The injection molding process is adopted to facilitate the manufacture of the gas cylinder core mold 1 and to ensure the bonding strength between the support ring 12 and the gas cylinder core mold 1.

[0048] Furthermore, a connection joint 11 is fixedly provided on the gas cylinder core mold 1, and the connection joint 11 is located at the through hole, and the connection joint 11 extends relative to the through hole. Specifically, an external thread is provided on the connection joint 11 to facilitate the subsequent installation of the switch valve. In this embodiment, the connection joint 11 can be integrally injection molded with the gas cylinder core mold 1.

[0049] Furthermore, the inner wall bracket 2 is made of 316L stainless steel, so that the inner wall bracket 2 has good rigidity and toughness.

[0050] like Figure 4 As shown, this embodiment also provides a manufacturing method for manufacturing the above hydrogen storage cylinder structure, comprising the following steps:

[0051] S1, soaking the inner wall bracket 2 in the adhesive liquid;

[0052] S2, sleeve the inner wall bracket 2 on the airbag 21;

[0053] S3, inserting the inner wall bracket 2 and the air bag 21 into the gas storage cavity of the gas cylinder core mold 1 through the through hole;

[0054] S4, inflate the airbag 21, so that the inner wall bracket 2 is expanded in a contracted state as the airbag 21 expands, until the inner wall bracket 2 fits with the inner wall surface of the gas storage cavity of the gas cylinder core mold 1, and stop inflating the airbag 21;

[0055] S5, deflate the airbag 21 and remove the airbag 21 from the air storage chamber;

[0056] S6, winding a wrapping layer 3 on the outer circumferential surface of the gas cylinder core mold 1 along the circumferential direction of the gas cylinder core mold 1;

[0057] S7, curing the winding layer 3 to form a gas storage cylinder.

[0058] Specifically, the winding layer 3 is made of carbon fiber and heat-fixing resin. After the winding layer 3 is wound on the gas cylinder core mold 1, a curing process is performed to ensure that the winding layer 3 is stably connected to the gas cylinder core mold 1.

[0059] Furthermore, in step S5, in order to prevent the inner wall bracket 2 from being bonded to the airbag 21 under the action of the viscose liquid, thereby preventing the airbag 21 from being removed, in this embodiment, the airbag 21 can be deflated and removed in time when the viscose liquid is not solidified. In other embodiments, an anti-sticking material can also be coated on the surface of the airbag 21, so that when the airbag 21 is separated from the inner wall bracket 2, it will not be affected by the viscose liquid.

[0060] Furthermore, the material of the airbag 21 should have good elasticity and processability, and can be made of PE, PA, TPU, NBR and other materials.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The structure of the hydrogen storage cylinder is characterized by: include: A gas cylinder core mold (1), wherein the gas cylinder core mold (1) has a hollow gas storage cavity, and a through hole is formed at the end of the gas cylinder core mold (1); An inner wall bracket (2), the inner wall bracket (2) is a cylindrical mesh structure, the inner wall bracket (2) is arranged in the gas storage cavity, and the inner wall bracket (2) extends along the axial direction of the gas cylinder core mold (1), and the inner wall bracket (2) is configured to be sleeved on the air bag (21), and during the inflation of the air bag (21), the inner wall bracket (2) is deformed by force in the radial direction, and is expanded from a contracted state to be in contact with the inner wall surface of the gas storage cavity of the gas cylinder core mold (1) and becomes a fixed support state; A wrapping layer (3), wherein the wrapping layer (3) is fixedly wrapped around the outer peripheral surface of the gas cylinder core mold (1).

2. The hydrogen storage cylinder structure according to claim 1, characterized in that: The inner wall support (2) is formed of a mesh structure by weaving a plurality of woven pieces (23), and a ratchet structure (4) is provided at the hinged nodes of the woven pieces (23), so that the inner wall support (2) can only change from a contracted state to a fixed support state in one direction.

3. The hydrogen storage cylinder structure according to claim 2, characterized in that: The ratchet structure (4) comprises a ratchet tooth (41) and a rotating shaft (43), wherein an annular ratchet groove (42) is provided on one of the braided pieces (23), the ratchet tooth (41) is fixedly arranged on the other braided piece (23), the rotating shaft (43) is arranged at the hinge of the two braided pieces (23) and is located in the annular ratchet groove (42), and the ratchet tooth (41) cooperates with the annular ratchet groove (42) to realize unidirectional rotation.

4. The hydrogen storage cylinder structure according to claim 1, characterized in that: The inner wall bracket (2) is coated with an adhesive layer, and the inner wall bracket (2) is bonded to the inner wall of the air storage cavity via the adhesive layer.

5. The hydrogen storage cylinder structure according to claim 1, characterized in that: The mesh (22) of the inner wall support (2) is hexagonal or rhombus-shaped.

6. The hydrogen storage cylinder structure according to claim 1, characterized in that: A support ring (12) is provided on the gas cylinder core mold (1).

7. The hydrogen storage cylinder structure according to claim 6, characterized in that: A plurality of support rings (12) are arranged at intervals along the axial direction of the gas cylinder core mold (1).

8. The hydrogen storage cylinder structure according to any one of claims 6-7, characterized in that: The support ring (12) and the gas cylinder core mold (1) are integrally injection molded.

9. The hydrogen storage cylinder structure according to claim 1, characterized in that: A connecting joint (11) is fixedly arranged on the gas cylinder core mold (1); the connecting joint (11) is located at the through hole, and the connecting joint (11) protrudes relative to the through hole.

10. A manufacturing method, characterized in that: The method for manufacturing the hydrogen storage cylinder structure according to any one of claims 1 to 9 comprises the following steps: S1, soaking the inner wall bracket (2) with adhesive liquid; S2, sleeve the inner wall bracket (2) onto the airbag (21); S3, inserting the inner wall bracket (2) and the air bag (21) into the gas storage cavity of the gas cylinder core mold (1) through the through hole; S4, inflating the airbag (21) so that the inner wall bracket (2) is expanded in a contracted state as the airbag (21) expands, until the inner wall bracket (2) is in contact with the inner wall surface of the air storage cavity of the gas cylinder core mold (1), and then stopping inflating the airbag (21); S5, deflating the airbag (21), and removing the airbag (21) from the air storage chamber; S6. Winding a wrapping layer (3) on the outer circumferential surface of the gas cylinder core mold (1) along the circumferential direction of the gas cylinder core mold (1); S7, curing the winding layer (3) to form a gas storage cylinder.

Images