Inner container structure of high-pressure gas cylinder

Abstract

The utility model provides a high-pressure gas cylinder liner structure, which comprises a liner, a cylinder valve seat and an adapter, the liner is an integrally formed structure comprising a liner body and a liner bottleneck, an area surrounded between the liner bottleneck and the liner body forms a concave mounting area, the end part of the cylinder valve seat is provided with a limiting boss mounted in the mounting area, and the adapter is connected with the limiting boss. The adapter is detachably arranged in the cylinder valve seat in a penetrating manner; one end of the inner container bottle opening is provided with an inner container thin protrusion extending in the circumferential direction of the inner container body, the side, used for forming the installation area, of the inner wall of the inner container thin protrusion is in abutting fit with the limiting boss, and the other side of the inner wall is in sealing fit with the end, installed in the bottle valve seat, of the adapter. An anti-shrinkage structure used for limiting the relative position of the inner container and the cylinder valve seat is arranged between the inner container and the cylinder valve seat, and the anti-shrinkage structure is arranged to avoid the abutting position of the limiting boss and the inner container thin protrusion. By the adoption of the scheme, the problem that in the prior art, sealing of a high-pressure gas cylinder inner container structure adopting a radial sealing mode is prone to failure due to influences of factors such as precision, slippage and high pressure can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen storage equipment, in particular to a high-pressure gas cylinder liner structure. Background Art

[0002] At present, with the development of the hydrogen energy industry, hydrogen storage is still one of the most important links. At present, the storage and transportation of hydrogen is mainly carried out through high-pressure containers. According to the different application fields of hydrogen, the storage and transportation containers also have different styles and specifications. Taking the high-pressure IV type hydrogen storage cylinder as an example, the IV type cylinder is one of the main cylinders currently used. It is a cylinder made of plastic liner as the lining and solidified by carbon fiber winding. Because of the existence of the liner, the sealing structure used for sealing is bound to contact the plastic liner to form an assembly pair. In the existing technology, radial sealing is more often used, that is, the sealing position is set between the two matching side walls.

[0003] However, the radial sealing method has high requirements on assembly accuracy and molding accuracy. It is easy to encounter problems such as difficulty in loading and unloading due to coaxiality errors between the inner liner and the valve seat during assembly. It is also easy to encounter sealing failures due to changes in material properties, expansion and contraction of the gas cylinder during fatigue testing of the gas cylinder, resulting in slippage of the sealing position, etc. This is especially difficult to control under high pressure conditions. Utility Model Content

[0004] The utility model provides a high-pressure gas cylinder liner structure to solve the problem that the sealing of the high-pressure gas cylinder liner structure adopting radial sealing method in the prior art is easily invalidated due to factors such as precision, slippage, and high pressure.

[0005] In order to solve the above problems, the utility model provides a high-pressure gas cylinder liner structure, including an inner liner, a bottle valve seat and an adapter, the inner liner is an integrally formed structure, the inner liner includes an inner liner body and an inner liner bottle mouth arranged at the end of the inner liner body, the area surrounded by the inner liner bottle mouth and the inner liner body forms a concave installation area, the end of the bottle valve seat has a limiting boss installed in the installation area and the shape of the bottle valve seat is adapted to the shape of the installation area, and the adapter is detachably inserted into the bottle valve seat; wherein, one end of the inner liner bottle mouth has an inner liner thin convex extending along the circumferential direction of the inner liner body, the inner liner thin convex is used to form a side of the inner wall of the installation area and abuts with the limiting boss, and the other side of the inner liner thin convex is sealed with the end face of one end of the adapter installed in the bottle valve seat, an anti-shrinkage structure is arranged between the inner liner and the bottle valve seat, the anti-shrinkage structure avoids the abutment position of the limiting boss and the inner liner thin convex, and the anti-shrinkage structure is used to limit the relative position of the inner liner and the bottle valve seat.

[0006] Furthermore, the bottle mouth of the liner includes a concave bottom plate, a bottle mouth barrel section and a bottle mouth thin plate arranged around the outer periphery of the end of the bottle mouth barrel section which are connected in sequence. The bottle mouth barrel section extends along the axial direction of the liner. The concave bottom plate and the bottle mouth thin plate are both annular plates and are parallel to the radial direction of the liner. The bottle mouth thin plate forms a thin convexity of the liner. The end of the liner body has a concave barrel section, and the end of the concave bottom plate facing away from the bottle mouth barrel section is connected to the concave barrel section.

[0007] Furthermore, the end surface of one end of the adapter inserted into the bottle valve seat has an annular sealing groove, and the high-pressure gas cylinder inner liner structure also includes an annular sealing ring, which is arranged in the annular sealing groove and cooperates with the thin convex seal of the inner liner.

[0008] Furthermore, the outer diameter of the inner shell thin protrusion is larger than the outer diameter of the annular sealing groove.

[0009] Furthermore, the thickness of the inner liner body is 2-5 mm, and the thickness of the inner liner thin convex part is 0.2-0.5 mm.

[0010] Furthermore, the liner is made of nylon material.

[0011] Furthermore, the anti-shrinkage structure includes a plurality of anti-slip dovetails arranged on the inner wall of the installation area, and any one of the anti-slip dovetails is an annular structure extending along the circumference of the inner liner. The outer surface of the end of the bottle valve seat installed in the installation area is correspondingly provided with a plurality of anti-slip grooves, and the plurality of anti-slip dovetails are arranged one by one in the plurality of anti-slip grooves.

[0012] Furthermore, the inner bottle mouth includes a concave bottom plate, a bottle mouth tube section and a bottle mouth thin plate arranged around the end periphery of the bottle mouth tube section which are connected in sequence, and a plurality of anti-slip dovetails are distributed on the concave bottom plate and the bottle mouth tube section at intervals.

[0013] Furthermore, the anti-shrinkage structure includes a plurality of anti-rotation protrusions spaced apart on the periphery of the bottle valve seat, the inner liner body has a plurality of anti-rotation opening grooves at positions for forming the installation area, and the plurality of anti-rotation protrusions are arranged one-to-one in the plurality of anti-rotation opening grooves.

[0014] Furthermore, the inner liner is formed by injection molding or rotational molding and covers the bottle valve seat.

[0015] The technical scheme of the utility model is applied to provide a high-pressure gas cylinder liner structure, including an inner liner, a bottle valve seat and an adapter, the inner liner is an integrally formed structure, the inner liner includes an inner liner body and an inner liner bottle mouth arranged at the end of the inner liner body, the area surrounded by the inner liner bottle mouth and the inner liner body forms a concave installation area, the end of the bottle valve seat has a limiting boss installed in the installation area and the shape of the bottle valve seat is adapted to the shape of the installation area, and the adapter is detachably inserted into the bottle valve seat; wherein, one end of the inner liner bottle mouth has an inner liner thin convex extending along the circumferential direction of the inner liner body, the inner liner thin convex is used to form a side of the inner wall of the installation area and abuts with the limiting boss, and the other side of the inner liner thin convex is sealed with the end face of one end of the adapter installed in the bottle valve seat, an anti-shrinkage structure is arranged between the inner liner and the bottle valve seat, the anti-shrinkage structure avoids the abutment position of the limiting boss and the inner liner thin convex, and the anti-shrinkage structure is used to limit the relative position of the inner liner and the bottle valve seat.

[0016] By adopting this scheme, the radial sealing method between the bottle valve seat and the inner liner commonly used in the prior art is replaced by an axial sealing method through the sealing cooperation between the thin convex part of the inner liner and the end face of the adapter, which avoids the situation in which the radial sealing method in the prior art has high requirements for assembly accuracy and molding accuracy, and the seal is easily invalidated due to factors such as accuracy, slippage, and high pressure. The axial sealing method adopted in this scheme can not only meet the high-pressure sealing requirements, but also ensure the sealing effect of the sealing position even when the molding accuracy fluctuates greatly. On the other hand, by setting an anti-shrinkage structure, relative movement or relative rotation between the inner liner and the bottle valve seat can be avoided when the gas cylinder is wound, and at the same time, the thin convex structure of the inner liner can be prevented from being damaged due to shrinkage and deformation of the inner liner material, further ensuring the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of a high-pressure gas cylinder liner structure provided by an embodiment of the utility model is shown;

[0019] Figure 2 Shows Figure 1 A cross-sectional view of

[0020] Figure 3 Shows Figure 2 A partial enlarged view of

[0021] Figure 4 Shows Figure 3 A partial enlarged view of

[0022] Figure 5 Shows Figure 1A schematic diagram of the structure of the cylinder valve seat in the inner liner structure of the high-pressure gas cylinder;

[0023] Figure 6 Shows Figure 1 Schematic diagram of the structure of the transfer joint in the inner liner structure of the high-pressure gas cylinder.

[0024] The above drawings include the following reference numerals:

[0025] 10. liner; 11. liner body; 111. concave cylinder section; 12. liner bottle mouth; 121. concave bottom plate; 122. bottle mouth cylinder section; 123. bottle mouth thin plate;

[0026] 20. Bottle valve seat;

[0027] 30. adapter; 301. annular sealing groove;

[0028] 40. Annular sealing ring;

[0029] 51. Anti-slip dovetail; 52. Anti-rotation opening slot. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] like Figures 1 to 6 As shown, an embodiment of the utility model provides a high-pressure gas cylinder liner structure, including a liner 10, a bottle valve seat 20 and an adapter 30. The liner 10 is an integrally formed structure. The liner 10 includes a liner body 11 and a liner bottle mouth 12 arranged at the end of the liner body 11. The area surrounded by the liner bottle mouth 12 and the liner body 11 forms a concave installation area. The end of the bottle valve seat 20 has a limiting boss installed in the installation area and the shape is adapted to the shape of the installation area. The adapter 30 is detachably inserted through In the bottle valve seat 20; wherein, one end of the inner liner bottle mouth 12 has a thin liner protrusion extending circumferentially along the inner liner body 11, and the inner liner thin protrusion is used to form a side of the inner wall of the installation area to abut and cooperate with the limiting boss, and the other side of the inner liner thin protrusion is sealed with the end face of one end of the adapter 30 installed in the bottle valve seat 20, and an anti-shrinkage structure is arranged between the inner liner 10 and the bottle valve seat 20, and the anti-shrinkage structure avoids the abutment position setting of the limiting boss and the inner liner thin protrusion, and the anti-shrinkage structure is used to limit the relative position of the inner liner and the bottle valve seat.

[0032] In this embodiment, the radial sealing method between the bottle valve seat 20 and the inner liner 10 commonly used in the prior art is replaced by an axial sealing method through the sealing cooperation between the thin convex part of the inner liner and the end face of the adapter 30, which avoids the situation that the radial sealing method in the prior art has high requirements for assembly accuracy and molding accuracy, and the seal is easily invalidated due to factors such as accuracy, slippage, and high pressure. The axial sealing method adopted in this scheme can not only meet the high-pressure sealing requirements, but also ensure the sealing effect of the sealing position even when the molding accuracy fluctuates greatly. On the other hand, by setting an anti-shrinkage structure, it is possible to avoid relative movement or relative rotation between the inner liner 10 and the bottle valve seat 20 when the gas cylinder is wound, and at the same time, it is possible to prevent the thin convex structure of the inner liner from being damaged due to shrinkage, deformation, etc. of the inner liner material, thereby further ensuring the sealing effect. Among them, the shape of the limiting boss is adapted to the shape of the installation area, and the limiting boss is installed in the installation area and is stopped in the installation area by the thin convex part of the inner liner.

[0033] It is understandable that the existing high-pressure gas cylinder liner structure needs to be matched with a special valve, and the assembly interchangeability is low, which is not conducive to valve replacement. The adapter 30 in this embodiment is used to switch the valve. Specifically, the adapter 30 and the bottle valve seat 20 are threadedly connected. The adapter 30 forms a sealing pair with the liner 10 and the bottle valve seat 20, and provides installation space for the valve, that is, the valve selected for the high-pressure gas cylinder liner structure will be installed on the adapter 30, and another sealing pair will be formed between the adapter 30. Preferably, the adapter 30 in this embodiment can be designed according to the style of the bottle valve seat 20 and / or the valve to increase the versatility of the high-pressure gas cylinder liner structure and the valve.

[0034] The liner 10 is formed by injection molding or rotational molding and covers the bottle valve seat 20. The liner 10 and the bottle valve seat 20 are matched by rotational molding or injection molding, and the bottle valve seat 20 is integrated with the liner 10 as an insert. Compared with other molding processes, the liner 10 obtained by injection molding or rotational molding of nylon materials in this embodiment has better precision and density, and is lighter than the liner of the type III gas cylinder made of metal materials.

[0035] like Figures 2 to 4 As shown, the inner liner bottle mouth 12 includes a concave bottom plate 121, a bottle mouth barrel section 122 and a bottle mouth thin plate 123 arranged around the outer periphery of the end of the bottle mouth barrel section 122 which are connected in sequence. The bottle mouth barrel section 122 extends along the axial direction of the inner liner 10. The concave bottom plate 121 and the bottle mouth thin plate 123 are both annular plates and are parallel to the radial direction of the inner liner 10. The bottle mouth thin plate 123 forms a thin convex of the inner liner. The end of the inner liner body 11 has a concave barrel section 111, and the end of the concave bottom plate 121 away from the bottle mouth barrel section 122 is connected to the concave barrel section 111.

[0036] In this embodiment, the bottle mouth thin plate 123 is the inner liner thin convex. When the inner liner thin convex is processed, if the injection molding process is used, the inner liner thin convex of the required thickness can be directly injected once; if rotational molding is used, after processing the inner liner thin convex of a certain thickness, if the thickness meets the required thickness requirement, no further processing is required. If the thickness is thicker than the required thickness, machining or rolling processes are added to process the inner liner thin convex to the required thickness. This arrangement facilitates the rapid molding of the inner liner thin convex. At the same time, since the inner liner thin convex in this embodiment can be formed only by the bottle mouth thin plate 123, there is no need to further design the shape of the inner liner thin convex, avoiding the situation of adding molding processes. At the same time, it also avoids the situation that when the shape of the inner liner thin convex is complex, it is easy to deform due to external factors such as high pressure, thereby affecting the assembly accuracy or sealing.

[0037] Preferably, the thickness of the inner liner body 11 is 2-5 mm, and the thickness of the inner liner thin convex part is 0.2-0.5 mm.

[0038] like Figure 4 and Figure 6 As shown, the end surface of the adapter 30 that is inserted into the bottle valve seat 20 has an annular sealing groove 301, and the high-pressure gas cylinder liner structure also includes an annular sealing ring 40, which is arranged in the annular sealing groove 301 and seals with the thin convex part of the liner. This arrangement facilitates the installation and positioning of the annular sealing ring 40.

[0039] Specifically, the outer diameter of the inner liner thin protrusion is larger than the outer diameter of the annular sealing groove 301. This arrangement ensures the abutment between the annular sealing ring 40 and the inner liner thin protrusion, and ensures the reliability of the annular sealing ring 40 sealing between the inner liner thin protrusion and the end face of the adapter 30.

[0040] It is understandable that, since the thin convex portion of the inner liner in this embodiment is formed only by the bottle mouth thin plate 123, the control accuracy of the outer diameter of the thin convex portion of the inner liner can be appropriately relaxed, and the dimensional change caused by the free shrinkage of the material can be accepted.

[0041] Optionally, the outer diameter of the inner liner thin protrusion is less than or equal to the radial dimension of the inner wall of the bottle valve seat 20 in the circumferential direction thereof.

[0042] Specifically, the inner liner 10 of the present embodiment is made of nylon material, which is higher in hardness than the inner liner 10 made of plastic material, which is beneficial to ensuring the stability of the inner liner 10 after molding, and is also beneficial to avoiding the situation where the inner liner 10 is easily deformed due to other factors after molding, thereby affecting the assembly accuracy.

[0043] like Figures 2 to 4As shown, the anti-shrinkage structure includes a plurality of anti-slip dovetails 51 arranged on the inner wall of the installation area, and any one of the anti-slip dovetails 51 is an annular structure extending along the circumference of the inner liner 10. The outer surface of the end of the bottle valve seat 20 installed in the installation area is correspondingly provided with a plurality of anti-slip grooves, and the plurality of anti-slip dovetails 51 are arranged in the plurality of anti-slip grooves in a one-to-one correspondence.

[0044] In this embodiment, there are three anti-slip dovetails 51, which are used to pull the inner liner 10 after the inner liner 10 and the bottle valve seat 20 are formed, so that the inner liner 10 and the bottle valve seat 20 are tightly combined and do not loosen. It can be understood that the structural style, number, and setting position of the anti-slip dovetails 51 and the anti-slip grooves can be designed and selected according to actual conditions, and no examples are given here one by one.

[0045] Specifically, the inner bottle mouth 12 includes a concave bottom plate 121, a bottle mouth tube section 122, and a bottle mouth thin plate 123 arranged around the outer periphery of the end of the bottle mouth tube section 122, which are connected in sequence. A plurality of anti-slip dovetails 51 are distributed at intervals on the concave bottom plate 121 and the bottle mouth tube section 122. In this way, the anti-slip dovetails 51 are avoided from being arranged at the edge of the installation area, so as to avoid the anti-slip dovetails 51 at the edge position being easily deformed by the force during installation, and the stability of the installation area is ensured on the basis of ensuring the anti-slip effect.

[0046] like Figure 5 As shown, the anti-shrinkage structure includes a plurality of anti-rotation protrusions arranged at intervals on the outer periphery of the bottle valve seat 20, and the position of the inner liner body 11 for forming the installation area has a plurality of anti-rotation opening grooves 52, and the plurality of anti-rotation protrusions are arranged in the plurality of anti-rotation opening grooves 52 in a one-to-one correspondence. In this embodiment, the number of the anti-rotation opening grooves 52 is preferably 1-8, and the anti-rotation opening grooves 52 and the anti-rotation protrusions are used to limit the relative rotation of the inner liner 10 and the bottle valve seat 20 after the inner liner 10 and the bottle valve seat 20 are formed, so as to avoid relative rotation between the inner liner 10 and the bottle valve seat 20 when the gas cylinder is wound. It can be understood that the structural style, quantity, and setting position of the anti-rotation protrusions and the anti-rotation opening grooves 52 can be designed and selected according to actual conditions, and examples are not given here one by one.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-pressure gas cylinder liner structure, characterized in that: The invention comprises an inner liner (10), a bottle valve seat (20) and an adapter (30), wherein the inner liner (10) is an integrally formed structure, wherein the inner liner (10) comprises an inner liner body (11) and an inner liner bottle mouth (12) arranged at the end of the inner liner body (11), wherein the area surrounded by the inner liner bottle mouth (12) and the inner liner body (11) forms a concave installation area, wherein the end of the bottle valve seat (20) has a limiting boss installed in the installation area and having a shape matching the shape of the installation area, and the adapter (30) is detachably inserted into the bottle valve seat (20); wherein one end of the inner liner bottle mouth (12) has an inner liner thin protrusion extending along the circumferential direction of the inner liner body (11), and the inner liner thin protrusion is used to One side of the inner wall forming the installation area is abutted with the limiting boss, and the other side of the inner liner thin convex is sealed with the end face of one end of the adapter (30) installed in the bottle valve seat (20). An anti-shrinkage structure is arranged between the inner liner (10) and the bottle valve seat (20). The anti-shrinkage structure avoids the abutment position of the limiting boss and the inner liner thin convex. The anti-shrinkage structure includes a plurality of anti-slip dovetails (51) arranged on the inner wall of the installation area. The outer surface of the limiting boss is correspondingly provided with a plurality of anti-slip grooves. The plurality of anti-slip dovetails (51) are arranged in a one-to-one correspondence in the plurality of anti-slip grooves to limit the relative position of the inner liner (10) and the bottle valve seat (20).

2. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The inner liner bottle mouth (12) comprises a concave bottom plate (121), a bottle mouth barrel section (122) and a bottle mouth thin plate (123) arranged around the outer periphery of the end of the bottle mouth barrel section (122) which are connected in sequence; the bottle mouth barrel section (122) extends along the axial direction of the inner liner (10); the concave bottom plate (121) and the bottle mouth thin plate (123) are both annular plates and parallel to the radial direction of the inner liner (10); the bottle mouth thin plate (123) forms the inner liner thin convex; the end of the inner liner body (11) has a concave barrel section (111); the end of the concave bottom plate (121) away from the bottle mouth barrel section (122) is connected to the concave barrel section (111).

3. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The end surface of one end of the adapter (30) inserted into the bottle valve seat (20) has an annular sealing groove (301), and the high-pressure gas cylinder liner structure also includes an annular sealing ring (40), which is arranged in the annular sealing groove (301) and cooperates with the thin convex seal of the liner.

4. The high-pressure gas cylinder liner structure according to claim 3, characterized in that: The outer diameter of the inner shell thin protrusion is larger than the outer diameter of the annular sealing groove (301).

5. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The thickness of the inner liner body (11) is 2-5 mm, and the thickness of the inner liner thin convex part is 0.2-0.5 mm.

6. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The inner liner (10) is made of nylon material.

7. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: Any one of the anti-slip dovetails (51) is an annular structure extending along the circumference of the inner liner (10).

8. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The inner liner bottle mouth (12) comprises an inner concave bottom plate (121), a bottle mouth tube section (122) and a bottle mouth thin plate (123) arranged around the outer periphery of the end of the bottle mouth tube section (122) which are connected in sequence, and a plurality of anti-slip dovetails (51) are distributed at intervals on the inner concave bottom plate (121) and the bottle mouth tube section (122).

9. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The anti-shrinkage structure comprises a plurality of anti-rotation protrusions arranged at intervals on the outer periphery of the bottle valve seat (20); the inner liner body (11) has a plurality of anti-rotation opening grooves (52) at a position used to form the installation area; and the plurality of anti-rotation protrusions are arranged one-to-one in the plurality of anti-rotation opening grooves (52).

10. The high-pressure gas cylinder liner structure according to claim 1, characterized in that: The inner liner (10) is formed by injection molding or rotational molding and covers the bottle valve seat (20).

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