Hydrogen storage cylinder with anti-bend inner liner

Abstract

This invention discloses a hydrogen storage cylinder with anti-inner liner buckling, relating to the field of hydrogen storage technology. It includes an inner liner, a fiber-wound layer, a valve seat, and an end plug. The inner liner has grooves at both ends, with a venting cylinder at the center of each groove. The valve seat includes an insert and an interface; the insert is embedded in the groove, and the interface connects to the insert. The end plug is threaded to the interface. The fiber-wound layer is wound from one valve seat through the inner liner to another. A lubricant layer is applied to the outer side of the valve seat to reduce friction, allowing relative sliding between the valve seat and the fiber-wound layer during pressure cycling. The insert has a conical surface for flaring the port of the fiber-wound layer. Compared to existing technologies, this invention enables the automatic release of hydrogen gas accumulated between the inner liner and the fiber-wound layer, thereby preventing the inner liner from buckling.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage technology, and in particular to a hydrogen storage cylinder with an anti-bendable inner liner. Background Technology

[0002] High-pressure hydrogen storage cylinders with fully wound plastic liner (referred to as "Type IV hydrogen storage cylinders") have broad development prospects as the main hydrogen storage equipment for hydrogen fuel cell vehicles. Type IV hydrogen storage cylinders have advantages such as high hydrogen storage density and good fatigue resistance, but the plastic liner has low rigidity, which poses a risk of buckling instability during use. Summary of the Invention

[0003] The purpose of this invention is to provide a hydrogen storage cylinder that prevents the inner liner from buckling, so that the hydrogen gas accumulated between the inner liner and the fiber winding layer can be automatically discharged.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention discloses a hydrogen storage cylinder with an anti-bending inner liner, comprising an inner liner, a fiber winding layer, a valve seat, and an end plug;

[0006] The inner liner has grooves at both ends, and the center of the groove is a venting cylinder; the valve seat includes an insert and an interface, the insert is connected to the interface, and the insert is embedded in the groove; the valve seat has a central hole that passes through the insert and the interface, the end plug is threaded to the central hole from the side where the interface is located, and the venting cylinder is inserted into the central hole from the side where the insert is located; the fiber winding layer is wound from one valve seat through the inner liner to the other valve seat;

[0007] The valve seat is coated with a lubricant layer on its outer side to allow it to slide relative to the fiber winding layer; the embedded part has a conical surface for flaring the port of the fiber winding layer.

[0008] Preferably, the end plug comprises a cover plate, an external thread section, and a cylindrical section connected in sequence.

[0009] Preferably, a sealing ring one is provided between the interface and the cover plate, and a sealing ring two is provided between the cylindrical section and the interface.

[0010] Preferably, a plurality of sealing rings are provided between the embedded part and the ventilated cylinder.

[0011] Preferably, the interface has a cylindrical surface and a conical surface, and the conical surface, the cylindrical surface, and the conical surface are connected in sequence; the diameters of the conical surface and the conical surface gradually increase from the end near the cylindrical surface to the end away from the cylindrical surface.

[0012] Preferably, the groove includes an annular plate and a conical plate, the end of the venting cylinder opposite to the end plug is connected to the inner edge of the annular plate, and the outer edge of the annular plate is connected to the inner edge of the conical plate; the diameter of the conical plate gradually decreases from the end near the cylindrical surface to the end opposite to the cylindrical surface.

[0013] Preferably, the embedding part further has a conical surface three, an end face and an inner cylindrical surface, the conical surface three is used to fit the conical plate, the end face is used to fit the annular plate, and the inner cylindrical surface is used to fit the venting cylinder;

[0014] The annular plate has an annular protrusion one, and the end face has an annular groove one that matches the annular protrusion one; the venting cylinder has an annular protrusion two, and the inner cylindrical surface has an annular groove two that matches the annular protrusion two.

[0015] Preferably, the inner liner is made of plastic.

[0016] Preferably, the valve seat and the end plug are made of metal.

[0017] Compared with related technologies, the present invention achieves the following technical effects:

[0018] This invention uses an embedded design to limit the valve seat and the inner liner to each other, and the conical surface of the valve seat and the fiber winding layer to limit each other to ensure that the valve seat will not fly out under high pressure.

[0019] When the inner liner is vented, the valve seat slides axially inward relative to the fiber winding layer. During the inflation and pressure holding process, the embedded part of the valve seat flares and shapes the port of the fiber winding layer. As the valve seat slides inward, the port of the fiber winding layer cannot remain tightly attached to the valve seat, but instead forms a gas channel between the two. The hydrogen gas that accumulates in the gap between the inner liner and the fiber winding layer is discharged to the atmosphere through the gas channel, thus avoiding the problem of inner liner buckling.

[0020] During the sliding process of the valve seat, the lubricant layer reduces friction, allowing the valve seat and the fiber winding layer to generate a greater relative displacement, thereby increasing the flaring and shaping effect of the fiber winding layer. This creates a larger gas channel when the inner liner is vented, facilitating the release of hydrogen from the gaps.

[0021] In a preferred embodiment of the present invention, hydrogen is discharged along a preset path by setting up multi-stage sealing rings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a hydrogen storage cylinder with anti-inner liner buckling according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A detailed structural distribution diagram of the hydrogen storage cylinders;

[0025] Figure 3 This is a schematic diagram of the valve seat;

[0026] Figure 4 This is a schematic diagram of bubbles being discharged along a gas channel.

[0027] In the picture:

[0028] 1-Inner liner; 2-Fiber winding layer; 3-Valve seat; 4-End plug; 5-Sealing assembly; 6-Bubble;

[0029] 11-Groove; 12-Ventilation cylinder; 111-Annular plate; 112-Conical plate; 121-Annular protrusion two; 1111-Annular protrusion one;

[0030] 31-Embedded part; 32-Interface; 33-Lubricant layer; 311-Conical surface one; 312-Conical surface three; 313-End face; 321-Cylindrical surface; 322-Conical surface two; 314-Inner cylindrical surface;

[0031] 41-Cover plate; 42-External thread section; 43-Cylindrical section;

[0032] 51 - Sealing ring one; 52 - Sealing ring two; 53 - Sealing ring three. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0034] The purpose of this invention is to provide a hydrogen storage cylinder that prevents the inner liner from buckling, so that the hydrogen gas accumulated between the inner liner and the fiber winding layer can be automatically discharged.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 , Figure 2 and Figure 4 The dotted line in the diagram represents the plane of central symmetry. For ease of understanding, Figure 4 The dimensions of bubble 6 and the hydrogen storage cylinder have been enlarged in the original image; in reality, the proportion of bubble 6 is smaller than that of the actual cylinder. Figure 4 The proportions shown.

[0036] Reference Figures 1-4 This embodiment provides a hydrogen storage cylinder (hereinafter referred to as a hydrogen storage cylinder) with an anti-bending inner liner, including an inner liner 1, a fiber winding layer 2, a valve seat 3, and an end plug 4.

[0037] The inner liner 1 has grooves 11 at both ends, with a venting cylinder 12 at the center of the grooves 11. Hydrogen gas flows in and out of the inner liner 1 through the venting cylinder 12. The valve seat 3 includes an insert 31 and an interface 32. The insert 31 connects to the interface 32 and is embedded in the groove 11. The valve seat 3 has a central hole that passes through the insert 31 and the interface 32. An end plug 4 is threaded to the central hole from the side where the interface 32 is located, and the venting cylinder 12 is inserted into the central hole from the side where the insert 31 is located. A fiber winding layer 2 is wound from one valve seat 3 through the inner liner 1 to the other valve seat 3, so as to simultaneously bind the valve seat 3 and the inner liner 1 inside.

[0038] The valve seat 3 is coated with a lubricant layer 33 on its outer side to allow the valve seat 3 to slide relative to the fiber winding layer 2. The insert 31 has a conical surface 311, with the smaller diameter end of the conical surface 311 being closer to the port of the fiber winding layer 2 than the larger diameter end, thereby widening the port of the fiber winding layer 2 through the conical surface 311 during inflation and pressure holding.

[0039] The working principle of the hydrogen storage cylinder in this embodiment is as follows:

[0040] The applicant's research found that the buckling was mainly related to the pressure difference formed by hydrogen accumulation in the gap between the inner liner 1 and the fiber winding layer 2 due to hydrogen permeation during the use of the hydrogen storage cylinder.

[0041] Therefore, in this embodiment, the bubbles 6 formed by hydrogen gas accumulation in the gap between the inner liner 1 and the fiber winding layer 2 are periodically and automatically discharged during the venting of the inner liner 1, thus avoiding the problem of inner liner buckling.

[0042] When the inner liner 1 is inflated, the valve seat 3 slides outward along the axial direction relative to the fiber winding layer 2, the port of the fiber winding layer 2 increases, and the inner surface near the port is tightly attached to the embedded part 31.

[0043] When the inner liner 1 is pressurized, hydrogen permeation occurs under high pressure. Hydrogen dissolves into the inner liner 1, diffuses, and then desorbs into the gap between the inner liner 1 and the fiber winding layer 2. The gap between the inner liner 1 and the fiber winding layer 2 is distributed between the inner liner and the fiber winding layer.

[0044] When the inner liner 1 is vented, the valve seat 3 slides axially inward relative to the fiber winding layer 2. During the inflation and pressure holding process, the embedded part 31 of the valve seat 3 flares out and shapes the port of the fiber winding layer 2. As the valve seat 3 slides inward, the port of the fiber winding layer 2 cannot remain tightly attached to the valve seat 3, but forms a gas channel between it and the valve seat 3. The hydrogen gas accumulated in the gap is discharged to the atmosphere through the gas channel, avoiding the problem of inner liner buckling.

[0045] When the inner liner 1 is inflated again, any remaining hydrogen near the port of the fiber winding layer 2 will be expelled into the atmosphere by the valve seat 3 as it slides outward relative to the fiber winding layer 2.

[0046] During the sliding process of the valve seat 3, the lubricant layer 33 reduces friction, allowing the valve seat 3 and the fiber winding layer 2 to generate a greater relative displacement, thereby increasing the flaring and shaping effect of the fiber winding layer 2. This results in a larger gas channel being formed when the inner liner 1 is vented, facilitating the release of hydrogen from the gap.

[0047] As a possible example, in this embodiment, the end plug 4 includes a cover plate 41, an external thread section 42, and a cylindrical section 43 connected in sequence.

[0048] The external thread section 42 is used to mate with the internal thread section of the center hole of the valve seat 3. The cover plate 41 is used to contact and limit the end face of the interface 32 to restrict the screwing distance of the external thread section 42. The cylindrical section 43 is used to insert into the vent cylinder 12, and the insertion of the two keeps the vent cylinder 12 in its own shape and position. When the end plug 4 is installed, the vent cylinder 12 is not ventilated; when the end plug 4 is removed, the vent cylinder 12 is ventilated.

[0049] As a possible example, in this embodiment, a sealing ring 51 is provided between the interface 32 and the cover plate 41, and a sealing ring 52 is provided between the cylindrical section 43 and the interface 32.

[0050] By setting sealing ring 51 and sealing ring 52, the sealing performance between interface 32 and end plug 4 is improved.

[0051] As a possible example, in this embodiment, a plurality of sealing rings 53 are provided between the embedded part 31 and the venting cylinder 12. Sealing ring 51, sealing ring 52, and sealing ring 53 constitute the sealing assembly 5 of this embodiment. Exemplarily, the number of sealing rings 53 is three.

[0052] By setting a sealing ring 353, the sealing performance between the interface 32 and the groove 11 is improved.

[0053] As a possible example, in this embodiment, the interface 32 has a cylindrical surface 321 and a conical surface 322, with the conical surface 311, cylindrical surface 321, and conical surface 322 connected in sequence. The diameters of the conical surface 311 and the conical surface 322 gradually increase from the end near the cylindrical surface 321 to the end away from the cylindrical surface 321.

[0054] Conical surface 311 is used to flare the end of the fiber winding layer 2 when the inner liner 1 is inflated and pressurized. Conical surface 322 is used to restrict the size of the gas passage when the inner liner 1 is deflated.

[0055] As a possible example, in this embodiment, the groove 11 includes an annular plate 111 and a conical plate 112. The end of the venting cylinder 12 away from the end plug 4 is connected to the inner edge of the annular plate 111, and the outer edge of the annular plate 111 is connected to the inner edge of the conical plate 112. The diameter of the conical plate 112 gradually decreases from the end near the cylindrical surface 321 to the end away from the cylindrical surface 321.

[0056] As a possible example, in this embodiment, the embedded part 31 also has a conical surface 312, an end face 313 and an inner cylindrical surface 314. The conical surface 312 is used to fit the conical plate 112, the end face 313 is used to fit the annular plate 111, and the inner cylindrical surface 314 is used to fit the venting cylinder 12. The inner cylindrical surface 314 is part of the central hole of the valve seat 3.

[0057] The annular plate 111 has an annular protrusion 1111, and the end face 313 has an annular groove 1 that matches the annular protrusion 1111. The venting cylinder 12 has an annular protrusion 2 121, and the inner cylindrical surface 314 has an annular groove 2 that matches the annular protrusion 2 121.

[0058] The engagement of the annular protrusion 1111 with the annular groove 1 restricts the radial relative movement of the embedded part 31 and the groove 11. The engagement of the annular protrusion 2 121 with the annular groove 2 restricts the axial relative movement of the embedded part 31 and the groove 11.

[0059] As a possible example, in this embodiment, the inner liner 1 is made of plastic, while the valve seat 3 and end plug 4 are made of metal. Depending on the specific needs, those skilled in the art may choose other materials.

[0060] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A hydrogen storage cylinder with an anti-bending inner liner, characterized in that, Includes inner liner, fiber-wound layer, valve seat and end plug; The inner liner has grooves at both ends, and the center of the groove is a venting cylinder; the valve seat includes an insert and an interface, the insert is connected to the interface, and the insert is embedded in the groove; the valve seat has a central hole that passes through the insert and the interface, the end plug is threaded to the central hole from the side where the interface is located, and the venting cylinder is inserted into the central hole from the side where the insert is located; the fiber winding layer is wound from one valve seat through the inner liner to the other valve seat; The valve seat is coated with a lubricant layer on its outer side to allow it to slide axially relative to the fiber winding layer; the embedded part has a conical surface for flaring the port of the fiber winding layer. The interface has a cylindrical surface and a conical surface, and the conical surface, the cylindrical surface, and the conical surface are connected in sequence. The diameters of the conical surface and the conical surface gradually increase from the end closest to the cylindrical surface to the end furthest from the cylindrical surface. The groove includes an annular plate and a conical plate. The end of the venting cylinder opposite to the end plug is connected to the inner edge of the annular plate, and the outer edge of the annular plate is connected to the inner edge of the conical plate. The diameter of the conical plate gradually decreases from the end near the cylindrical surface to the end opposite to the cylindrical surface. The embedded part also has a conical surface three, an end face and an inner cylindrical surface. The conical surface three is used to fit the conical plate, the end face is used to fit the annular plate, and the inner cylindrical surface is used to fit the venting cylinder. The annular plate has an annular protrusion one, and the end face has an annular groove one that matches the annular protrusion one; the venting cylinder has an annular protrusion two, and the inner cylindrical surface has an annular groove two that matches the annular protrusion two.

2. The hydrogen storage cylinder with anti-inner liner buckling according to claim 1, characterized in that: The end plug comprises a cover plate, an external threaded section, and a cylindrical section connected in sequence.

3. The hydrogen storage cylinder with anti-inner liner buckling according to claim 2, characterized in that: A sealing ring one is provided between the interface and the cover plate, and a sealing ring two is provided between the cylindrical section and the interface.

4. The hydrogen storage cylinder with anti-inner liner buckling according to claim 1, characterized in that: Several sealing rings are provided between the embedded part and the ventilated cylinder.

5. The hydrogen storage cylinder with anti-inner liner buckling according to claim 1, characterized in that: The inner liner is made of plastic.

6. The hydrogen storage cylinder with anti-inner liner buckling according to claim 1, characterized in that: The valve seat and the end plug are made of metal.

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