A two-way through metal bottle mouth structure for type IV hydrogen storage bottle

Abstract

The present invention discloses a bidirectional through-type metal bottle mouth structure of a type IV hydrogen storage bottle, comprising a metal valve seat, a plastic liner and a fiber winding layer; a valve seat hole is provided inside the metal valve seat, comprising an annular flange, a valve seat column section and a valve seat extension; the valve seat column section is provided with an L-shaped through hole and a radial through hole; the valve seat hole is an irregular through hole, provided with an annular groove; the valve seat extension is provided with a winding inclined surface, a self-tightening conical surface, a circumferential groove and an axial through hole; the plastic liner comprises an inner plastic joint, an outer plastic joint, a conical connecting section, an L-shaped connector, a radial connector, an axial connector and a reinforcement section, the trumpet-shaped annular boss on the upper part of the inner plastic joint is tightly embedded in the annular groove, and the lower part of the inner plastic joint, the L-shaped connector and the radial connector are surrounded by a "sun"-shaped bundling structure, which wraps the lower part of the valve seat column section inside and outside. The present invention realizes a bundled fastening connection and strengthens the sealing effect, thereby ensuring the reliability and stability of the connection between the plastic liner and the metal valve seat.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure composite hydrogen storage containers, and in particular relates to a two-way penetrating metal bottle mouth structure of a type IV hydrogen storage bottle. Background Art

[0002] Under the background of the "30·60" goal, hydrogen energy has attracted more and more attention and has been applied in national production and life, and will become an important part of my country's energy system. In the core link of the hydrogen energy industry chain - storage, transportation and use, hydrogen storage bottles are one of the most critical and weakest parts of this link, especially the design and research of the new generation of type IV hydrogen storage bottles need to be further improved.

[0003] Type IV hydrogen storage bottle is a new type of hydrogen storage bottle composed of plastic liner and metal bottle mouth. It has the advantages of light weight, low cost, high hydrogen storage mass density, high pressure bearing capacity, etc. However, since the connection between the plastic liner and the metal bottle mouth is not tight enough, if it is not designed properly, it will cause hydrogen leakage, which will pose a serious threat to people's lives and property. Therefore, designing a reliable sealed bottle mouth structure is very important for the safety of Type IV hydrogen storage bottles, and it is also the focus of current research on Type IV hydrogen storage bottles.

[0004] At present, some designs of bottle mouths of hydrogen storage bottles have been carried out at home and abroad. For example, Chinese patent ZL202111001227.4 realizes the reliability of the connection between the metal bottle mouth and the plastic liner by fastening the connection structure and the anti-rotation structure, and sets an octagonal pad and an O-ring to ensure the sealing of the bottle mouth; Chinese patent ZL202111001227.4 uses the buckle structure formed by the combination of the gland, the plastic liner and the valve seat, as well as the labyrinth seal and the cone seal to improve the reliability and sealing of the bottle mouth, and US patent US7731051B2 sets the bolt and the bushing to interfere with the plastic liner to ensure the connection strength and sealing performance of the bushing and the plastic liner. It can be seen that there are various designs for the connection and sealing forms of the metal bottle mouth and the plastic liner at present, but in the harsh high-pressure (70MPa) variable temperature environment, the bottle mouth structure of the type IV hydrogen storage bottle still exposes problems such as unstable connection between the plastic liner and the metal bottle mouth, poor sealing effect, poor resistance to pressure shock and temperature alternation.

[0005] In summary, there is an urgent need to design a metal bottle mouth structure for a type IV hydrogen storage bottle with high connection strength, good sealing performance, and strong resistance to variable working conditions and dynamic impact, so as to enhance the safety and reliability of the type IV hydrogen storage bottle and greatly improve the service life of the type IV hydrogen storage bottle. Summary of the invention

[0006] To solve the above technical problems existing in the prior art, the present invention provides a two-way through-type metal bottle mouth structure for type-IV hydrogen storage bottles. The present invention mainly adopts an integrated structure in which a plastic inner liner axially and radially penetrates a metal valve seat, supplemented by a multi-cone surface seal, and realizes a three-way high-strength bundling connection between the plastic inner liner and the metal valve seat through a tight fit, improving the bonding effect and sealing reliability between the plastic inner liner and the metal valve seat. At the same time, it has good resistance to alternating working conditions and dynamic impacts, making the combination between the plastic inner liner and the metal valve seat more reliable and stable, and having good adaptability under variable pressure and temperature working conditions and dynamic impact effects.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A two-way through-type metal bottle mouth structure for type-IV hydrogen storage bottles, characterized in that it includes a metal valve seat, a plastic inner liner, and a fiber winding layer;

[0009] The metal valve seat includes an annular flange, a valve seat column section, and a valve seat extension part, and a valve seat hole is provided inside; the valve seat column section is provided with an L-shaped through hole and a radially penetrating hole; the horizontal section of the L-shaped through hole is radially provided in the valve seat column section, and the vertical section is axially provided in the valve seat extension part; the valve seat extension part is axially provided with an axially penetrating hole, and a circumferential groove is provided on the outer cylindrical surface, and the axially penetrating hole is vertically connected to the circumferential groove; a bevel surface is provided on the upper surface of the valve seat extension part. A winding cone surface is provided on the upper part of the valve seat extension part for fiber winding transition, and a self-tightening cone surface is provided on the lower part;

[0010] The valve seat hole is an irregular through hole, which sequentially includes a valve seat first cylindrical surface, a valve seat first conical surface, a valve seat threaded surface, an annular groove, a valve seat second conical surface, and a valve seat second cylindrical surface from top to bottom; the valve seat second cylindrical surface is respectively connected to the L-shaped through hole and the radially penetrating hole;

[0011] The plastic inner liner includes an inner plastic joint, an outer plastic joint, a conical connection section, an L-shaped connection body, a radial connection body, an axial connection body, and a strengthening section. The inner plastic joint and the outer plastic joint are connected by the conical connection section; the inner plastic joint is clamped between the metal valve seat and the bottle valve, and the upper trumpet-shaped annular boss is tightly embedded inside the annular groove; the outer conical surface of the trumpet-shaped annular boss is tightly attached to the valve seat second conical surface; the upper end of the inner plastic joint is flush with the lower end of the valve seat threaded surface, the outer surface is tightly attached to the surface of the valve seat hole, and the bottom is wrapped around the lower part of the valve seat column section; the L-shaped connection body is embedded inside the L-shaped through hole, and the radial connection body is embedded inside the radially penetrating hole; a "day"-shaped bundling structure is formed by enclosing the lower part of the inner plastic joint, the L-shaped connection body, and the radial connection body, wrapping the inside and outside of the lower part of the valve seat column section; the conical connection section is tightly attached to the self-tightening cone surface;

[0012] The outer plastic joint includes a first end joint at the upper part and a second end joint at the lower part. The upper end of the first end joint is flush with the lower end of the winding conical surface, closely adheres to the inclined surface, and extends downward to be connected with the second end joint. The axial connecting body is embedded inside the axially penetrating hole, and the strengthening section is embedded inside the circumferential groove. The first end joint, the second end joint, the axial connecting body, and the strengthening section enclose a bundling structure that wraps the upper and lower parts outside the valve seat extension part.

[0013] The fiber winding layer winds around the outer wall surfaces of the plastic inner liner and the metal valve seat.

[0014] Further, the angles of the first conical surface and the second conical surface of the valve seat are the same, both being 15 - 45°.

[0015] Further, the angle of the inclined surface is 15 - 30°.

[0016] Further, the angles of the winding conical surface and the self - tightening conical surface are the same, both being 15 - 45°.

[0017] Further, 4 - 8 L - shaped through - holes are provided.

[0018] Further, the radially penetrating holes are provided in 1 - 3 layers, with 4 - 8 holes in each layer.

[0019] Further, 4 - 8 axially penetrating holes are provided.

[0020] Further, the metal valve seat is made of aluminum alloy; the inner layer of the fiber winding layer is carbon fiber, and the outer layer is a glass fiber protective layer.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] ⑴ The present invention mainly adopts an integrated structure form in which the plastic inner liner penetrates through the metal valve seat. By using the multi - dimensional axially and radially penetrating holes and L - shaped through - holes, a multi - directional and tight bundling structure of the upper, lower, inner, and outer parts of the plastic inner liner and the metal valve seat is formed, greatly improving the connection strength between the plastic inner liner and the metal valve seat, making the combination between the plastic inner liner and the metal valve seat more reliable and stable, and having good adaptability under various pressure and temperature conditions and dynamic impact effects.

[0023] ⑵ In the present invention, a clever design of a combined opening of a flared structure and a radially penetrating hole - L - shaped through - hole is adopted in the middle and lower sections of the valve seat hole inside the metal valve seat. A gradually changing annular boss is formed at the upper end of the inner joint of the plastic inner liner, and it continues downward to be connected with a plurality of "day" - shaped bundling structures evenly distributed at the lower end of the valve seat hole, effectively realizing that the plastic inner liner and the metal valve seat always remain in close contact during the installation process of the bottle valve and under complex filling and pressure - releasing conditions.

[0024] ⑶ In the present invention, the outer side of the metal valve seat extension portion is designed with an axial through hole and a circumferential groove, and the external joint of the plastic liner is coated on the upper, middle and lower parts of the metal valve seat extension portion in multiple layers. By combining multiple binding structures evenly distributed on the outer diameter side, the metal valve seat and the plastic liner are further improved in their ability to resist external dynamic interference. At the same time, the inner and outer connecting sections of the metal valve seat and the upper surface of the extension portion are provided with conical surfaces, which effectively extend the leakage path between the plastic liner and the metal valve seat, and fully ensure the self-tightening excellent sealing of the plastic liner and the metal valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the metal valve seat structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the metal valve seat of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the plastic liner of the present invention;

[0029] Description of reference numerals:

[0030] Metal valve seat 1; annular flange 11; valve seat column section 12; L-shaped through hole 121; radial through hole 122; valve seat extension 13; axial through hole 131; circumferential groove 132; inclined surface 133; winding cone 134; self-tightening cone 135; valve seat hole 14; valve seat first cylindrical surface 141; valve seat first conical surface 142; valve seat threaded surface 143; annular groove 144; valve seat second conical surface 145; valve seat second cylindrical surface 146; plastic liner 2; inner plastic joint 21; trumpet-shaped annular boss 211; outer plastic joint 22; first end joint 221; second end joint 222; conical connecting section 23; L-shaped connector 24; radial connector 25; axial connector 26; reinforcement section 27; fiber winding layer 3. DETAILED DESCRIPTION

[0031] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] The present invention will be described in detail below in conjunction with exemplary embodiments with reference to the accompanying drawings.

[0034] refer to Figures 1 to 4, a two-way through-type metal bottle mouth structure of a type-IV hydrogen storage bottle according to the present invention, comprising a metal valve seat 1, a plastic inner liner 2, and a fiber winding layer 3; the metal valve seat 1 includes an annular flange 11, a valve seat column section 12, and a valve seat extension 13, and a valve seat hole 14 is opened on the inner side; the valve seat column section 12 is provided with an L-shaped through hole 121 and a radial through hole 122; the horizontal section of the L-shaped through hole 121 is opened radially on the valve seat column section 12, and the vertical section is opened axially on the valve seat extension 13; the valve seat extension 13 is provided with an axial through hole 131 axially, and a circumferential groove 132 is opened on the outer cylindrical surface, and the axial through hole 131 is vertically communicated with the circumferential groove 132; a bevel surface 133 is provided on the upper surface of the valve seat extension 13. A winding conical surface 134 is provided on the upper part of the valve seat extension 13 for fiber winding transition, and a self-tightening conical surface 135 is provided on the lower part.

[0035] The valve seat hole 14 is an irregular through hole, which sequentially includes a valve seat first cylindrical surface 141, a valve seat first conical surface 142, a valve seat thread surface 143, an annular groove 144, a valve seat second conical surface 145, and a valve seat second cylindrical surface 146 from top to bottom; the valve seat second cylindrical surface 146 is respectively communicated with the L-shaped through hole 121 and the radial through hole 122.

[0036] The plastic inner liner 2 includes an inner plastic joint 21, an outer plastic joint 22, a conical connection section 23, an L-shaped connection body 24, a radial connection body 25, an axial connection body 26, and a strengthening section 27. The inner plastic joint 21 and the outer plastic joint 22 are connected by the conical connection section 23. The inner plastic joint 21 is clamped between the metal valve seat 1 and the bottle valve, and the upper trumpet-shaped annular boss 211 is tightly clamped inside the annular groove 144. The outer conical surface of the trumpet-shaped annular boss 211 is tightly attached to the valve seat second conical surface 145. The upper end of the inner plastic joint 21 is flush with the lower end of the valve seat thread surface 143, the outer cylindrical surface is tightly attached to the surface of the valve seat hole 14, and the bottom is covered with the lower part of the valve seat column section 12. The L-shaped connection body 24 is clamped inside the L-shaped through hole 121, and the radial connection body 25 is clamped inside the radial through hole 122. The lower part of the inner plastic joint 21, the L-shaped connection body 24, and the radial connection body 25 enclose a "day" - shaped bundling structure to wrap the inside and outside of the lower part of the valve seat column section 12. The conical connection section 23 is tightly attached to the self-tightening conical surface 135.

[0037] The outer plastic joint 22 includes an upper first end joint 221 and a lower second end joint 222. The upper end of the first end joint 221 is flush with the lower end of the winding cone 134, closely fits the inclined surface 133, and extends downward to connect with the second end joint 222. The axial connector 26 is embedded in the axial through hole 131, and the reinforcement section 27 is embedded in the circumferential groove 132. The first end joint 221, the second end joint 222, the axial connector 26 and the reinforcement section 27 form a binding structure, which wraps the outer side of the valve seat extension 13 from top to bottom.

[0038] The fiber winding layer 3 is wound around the plastic inner liner 2 and the outer wall surface of the metal valve seat 1 .

[0039] The metal valve seat 1 is assembled with the mold and placed in the mold cavity. The plastic liner 2 is injected into the gap between the metal valve seat 1 and the mold and into the L-shaped through hole 121, the radial through hole 122, the axial through hole 131 and the circumferential groove 132 to form an integrated two-way through structure, and then the mold is demolded. The fiber winding layer 3 is wound around the outer wall of the plastic liner 2 and the metal valve seat 1.

[0040] The first conical surface 142 of the valve seat and the second conical surface 145 of the valve seat have the same angle, both of which are 15 to 45 degrees.

[0041] The angle of the inclined surface 133 is 15-30°.

[0042] The winding cone surface 134 and the self-tightening cone surface 135 have the same angle, which is 15 to 45 degrees.

[0043] The number of the L-shaped through holes 121 is 4 to 8.

[0044] The radial through holes 122 are arranged in 1 to 3 layers, with 4 to 8 holes in each layer.

[0045] The number of the axial through holes 131 is 4 to 8.

[0046] The metal valve seat 1 is made of aluminum alloy.

[0047] The inner layer of the fiber winding layer 3 is carbon fiber, and the outer layer is a glass fiber protective layer.

[0048] The working principle of the present invention is as follows:

[0049] A two-way through-type metal bottle mouth structure for a type IV hydrogen storage bottle mainly adopts an integrated structure in which a plastic liner penetrates a metal valve seat along the axis and radial direction, supplemented by multiple conical seals, which cleverly achieves a three-way high-strength binding connection and tight fit between the metal valve seat and the plastic liner, improves the combination effect and sealing reliability of the plastic liner and the metal valve seat, and at the same time has good resistance to alternating working conditions and dynamic impacts.

[0050] The plastic inner liner 2 is composed of an inner plastic joint 21, an outer plastic joint 22 and various connecting bodies. The inner plastic joint 21 is clamped between the metal valve seat 1 and the bottle valve. The inner plastic joint 21 penetrates through the L-shaped through hole 121 and the radial through hole 122 formed inside the valve seat column section 12 in multiple directions and two-way through the L-shaped connecting body 24 and the radial connecting body 25, and encloses a "day" - shaped bundling structure at the lower part of the valve seat column section 12. The outer plastic joint 22 includes a first end joint 221 at the upper part and a second end joint 222 at the lower part along the axial direction. The first end joint 221 and the second end joint 222 penetrate through the axial through hole 131 and the circumferential groove 132 formed outside the valve seat extension 13 in multiple directions and two-way through the axial connecting body 26 and the strengthening section 27, and enclose a bundling structure outside the valve seat extension 13. Finally, the plastic inner liner 2 can not only tightly cover the outside of the metal valve seat 1, but also form radial, axial and circumferential bundling between the inner and outer sides of the metal valve seat, improving the bonding strength between the metal valve seat 1 and the plastic inner liner 2. Under the three-way stable constraint, the adaptability of the bottle mouth structure to sudden changes in pressure or temperature is greatly enhanced.

[0051] In addition, multiple forms of conical surface sealing, threaded connection and wrapping and embedding are set between the metal valve seat 1, the plastic inner liner 2 and the bottle valve to extend the leakage path of the internal hydrogen, improve the reliability of the connection between the metal valve seat and the plastic inner liner, ensure that the hydrogen storage bottle has good sealing performance, and greatly improve the service life of the hydrogen storage bottle. The metal valve seat 1 is connected with the bottle valve through the valve seat thread surface 143 at the upper part. The flared annular boss 211 at the upper part of the inner plastic joint 21 is embedded in the annular groove 144 and tightly fits on the second conical surface 145 of the valve seat, enhancing the embedding and sealing effect between the plastic inner liner 2 and the metal valve seat 1 while ensuring the smooth progress of the injection molding process. The inner plastic joint 21 and the outer plastic joint 22 are connected by a conical connecting section 23 and tightly fit on the self-tightening conical surface 135 at the lower part of the valve seat extension 13. The inclined surface 133 and the winding conical surface 134 at the upper part of the valve seat extension 13 are jointly used to ensure the fitting degree between the metal valve seat 1 and the plastic inner liner 2 and strengthen the sealing effect.

[0052] The fiber winding layer 3 is generally divided into a circumferential winding layer and a longitudinal winding layer. The inner layer of carbon fiber is wound on the outer wall surfaces of the metal valve seat 1 and the plastic inner liner 2, and then the outer layer of glass fiber is wound on the carbon fiber.

[0053] There are generally two pathways for gas leakage in hydrogen storage bottles, one is leakage through the bottle valve, and the other is leakage from the connection gap between the metal valve seat and the plastic liner. Hydrogen storage bottles often face working environments with pressure changes and temperature changes, and even withstand the impact of dynamic shocks. Under such complex working conditions, it is easy to cause instability in the connection between the plastic liner and the metal valve seat, resulting in hydrogen leakage. The present invention is an improvement on the connection and sealing form between the metal valve seat and the plastic liner. Regarding leakage at the connection between the metal valve seat 1 and the plastic liner 2: the present invention adopts an integrated two-way through-type wrapping structure, and forms a multi-point bundling structure in the valve seat column section and the extension part, which not only ensures the connection strength between the plastic liner and the metal valve seat, and avoids the disembedding and peeling that are easy to occur between the two materials, but also effectively extends the hydrogen leakage path, and is supplemented by multiple conical seals to ensure the sealing reliability and dynamic stability between the metal valve seat 1 and the plastic liner 2.

[0054] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle, characterized in that: It includes a metal valve seat, a plastic inner liner and a fiber winding layer; The metal valve seat includes an annular flange, a valve seat column section and a valve seat extension part, and a valve seat hole is formed on the inner side; an L-shaped through hole and a radial through hole are formed in the valve seat column section; the horizontal section of the L-shaped through hole is formed in the valve seat column section along the radial direction, and the vertical section is formed in the valve seat extension part along the axial direction; an axial through hole is formed in the valve seat extension part along the axial direction, and a circumferential groove is formed on the outer cylindrical surface, and the axial through hole is vertically communicated with the circumferential groove; a bevel surface is provided on the upper surface of the valve seat extension part; a winding conical surface is arranged on the upper part of the valve seat extension part for fiber winding transition, and a self-tightening conical surface is arranged on the lower part; The valve seat hole is an irregular through hole, which sequentially includes a valve seat first cylindrical surface, a valve seat first conical surface, a valve seat thread surface, an annular groove, a valve seat second conical surface and a valve seat second cylindrical surface from top to bottom; the valve seat second cylindrical surface is respectively communicated with the L-shaped through hole and the radial through hole; The plastic inner liner includes an inner plastic joint, an outer plastic joint, a conical connection section, an L-shaped connection body, a radial connection body, an axial connection body and a strengthening section. The inner plastic joint and the outer plastic joint are connected by the conical connection section; the inner plastic joint is clamped between the metal valve seat and the bottle valve, and the upper trumpet-shaped annular boss is tightly clamped inside the annular groove; the outer conical surface of the trumpet-shaped annular boss is tightly attached to the valve seat second conical surface; the upper end of the inner plastic joint is flush with the lower end of the valve seat thread surface, and the outer surface is tightly attached to the surface of the valve seat hole, and the bottom is covered on the lower part of the valve seat column section; the L-shaped connection body is clamped inside the L-shaped through hole, and the radial connection body is clamped inside the radial through hole; an "8" - shaped bundling structure is formed by enclosing the lower part of the inner plastic joint, the L-shaped connection body and the radial connection body, which wraps the inside and outside of the lower part of the valve seat column section; the conical connection section is tightly attached to the self-tightening conical surface; The outer plastic joint includes a first end joint at the upper part and a second end joint at the lower part. The upper end of the first end joint is flush with the lower end of the winding conical surface, tightly attached to the bevel surface, and extends downward to be connected with the second end joint; the axial connection body is clamped inside the axial through hole, and the strengthening section is clamped inside the circumferential groove; a bundling structure is formed by enclosing the first end joint, the second end joint, the axial connection body and the strengthening section, which wraps the outside of the valve seat extension part up and down; The fiber winding layer is wound on the outer wall surfaces of the plastic inner liner and the metal valve seat.

2. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle as claimed in claim 1, characterized in that: The valve seat first conical surface and the valve seat second conical surface have the same angle, both of which are 15 - 45°.

3. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle as claimed in claim 1, characterized in that: The angle of the bevel surface is 15 - 30°.

4. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle as claimed in claim 1, characterized in that: The winding conical surface and the self-tightening conical surface have the same angle, both of which are 15 - 45°.

5. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle as claimed in claim 1, characterized in that: 4 - 8 L-shaped through holes are formed.

6. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle as claimed in claim 1, characterized in that: The radial through holes are formed in 1 - 3 layers, and there are 4 - 8 in each layer.

7. A two-way through metal bottle mouth structure of a Type IV hydrogen storage bottle as claimed in claim 1, characterized in that: 4 - 8 axial through holes are formed.

8. A two-way through metal bottle mouth structure of a type IV hydrogen storage bottle as claimed in any one of claims 1 to 7, characterized in that: The metal valve seat is made of aluminum alloy material; the inner layer of the fiber winding layer is carbon fiber, and the outer layer is a glass fiber protective layer.

Images