Bottle opening structure and IV type hydrogen storage bottle applying same

Abstract

The invention relates to the technical field of high-pressure hydrogen storage bottles, discloses a bottle opening structure and an IV type hydrogen storage bottle applying the bottle opening structure, and aims at improving the axial constraining force at a bottle opening of an inner container and the connecting strength between the inner container and a bottle valve seat, avoiding leakage failure and further improving the safety and reliability of the IV type hydrogen storage bottle. The bottle opening structure comprises a bottle valve seat, the bottom of the bottle valve seat is provided with a first limiting convex part and a first limiting groove, and the outer side of the first limiting convex part forms the side wall of the first limiting groove; at least one limiting hole is formed in the first limiting convex part and is communicated with the inner side and the outer side of the first limiting convex part; the inner container comprises a bottle opening section; the bottle opening section comprises a second limiting convex part, a third limiting convex part and at least one connecting part, and the connecting part is connected between the first limiting convex part and the second limiting convex part; wherein the second limiting convex part is connected into the first limiting groove, the third limiting convex part is connected to the inner side of the first limiting convex part, and the connecting part is arranged in the limiting hole in a penetrating mode.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure hydrogen storage bottles, and in particular to a bottle mouth structure and an IV type hydrogen storage bottle using the same. Background Art

[0002] As global energy consumption increases and the degree of air pollution caused by traditional energy increases year by year, hydrogen energy, as a clean energy, has attracted widespread attention due to its advantages such as high energy density, cleanliness and zero pollution. The hydrogen storage tank is the core device for providing hydrogen energy. Type IV hydrogen storage cylinders have the potential for lightweighting because their inner liner is made of plastic and is relatively small in weight. Therefore, Type IV hydrogen storage cylinders are becoming a research hotspot around the world.

[0003] However, during the service of Type IV hydrogen storage cylinders, leakage failure at the connection between the plastic liner and the valve seat at the cylinder mouth is one of the main failure modes in its engineering applications, which seriously threatens the safety and reliability of Type IV hydrogen storage cylinders.

[0004] In the related art, the mouth structure of the IV type hydrogen storage cylinder usually includes a plastic liner and a bottle mouth valve seat, the bottle mouth valve seat includes a neck and a shoulder, and the plastic liner is usually connected to the shoulder of the bottle mouth valve seat, resulting in insufficient axial restraint at the mouth of the plastic liner. After installing the bottle mouth valve and other structures, the mouth of the plastic liner is easily deformed due to external extrusion force, resulting in leakage failure, affecting the safety and reliability of the IV type hydrogen storage cylinder. Summary of the invention

[0005] In view of this, the present invention provides a bottle mouth structure and a type IV hydrogen storage bottle using the same, so as to solve the problem that the axial restraint force at the bottle mouth of the plastic liner of the type IV hydrogen storage bottle is insufficient, thereby reducing the safety and reliability of the type IV hydrogen storage bottle.

[0006] In the first aspect, the present invention provides a bottle mouth structure, which is applied to a Type IV hydrogen storage bottle, comprising: a bottle valve seat, a first limiting protrusion and a first limiting groove are provided at the bottom of the bottle valve seat, and the outer side of the first limiting protrusion forms a side wall of the first limiting groove; at least one limiting hole is provided on the first limiting protrusion, and the limiting hole connects the inner side and the outer side of the first limiting protrusion; an inner liner, comprising a bottle mouth section; the bottle mouth section comprises a second limiting protrusion, a third limiting protrusion and at least one connecting portion, and the connecting portion is connected between the first limiting protrusion and the second limiting protrusion; wherein the second limiting protrusion is connected to the first limiting groove, the third limiting protrusion is connected to the inner side of the first limiting protrusion, and the connecting portion is penetrated into the limiting hole.

[0007] Optionally, the bottle valve seat is coaxially arranged with the bottle mouth section, and a mounting hole is formed together along the axial direction; the first limiting protrusion, the first limiting groove, the second limiting protrusion, and the third limiting protrusion are all annular and arranged around the mounting hole.

[0008] Optionally, a plurality of limiting holes are arranged at intervals along the circumference of the first limiting protrusion; and / or a plurality of limiting holes are arranged at intervals along the axial direction of the first limiting protrusion; and / or the limiting holes are arc-shaped and extend along the circumference of the first limiting protrusion.

[0009] Optionally, the bottle valve seat includes a first central section and a supporting section, a first limiting protrusion and a first limiting groove are arranged at the bottom of the first central section; the supporting section is connected to the bottom of the first central section and extends around the outer peripheral side of the first central section; the inner liner includes a transition section extending around the outer peripheral side of the bottle mouth section, the transition section covers and is connected to the bottom of the supporting section; in the direction perpendicular to the top to the bottom of the supporting section, a concave-convex structure is arranged at the connection between the transition section and the supporting section.

[0010] Optionally, the concave-convex structure includes a second limiting groove and a fourth limiting protrusion; the second limiting groove is arranged on the outer peripheral side of the supporting section, and the fourth limiting protrusion is arranged on the transition section; or, the fourth limiting protrusion is arranged on the outer peripheral side of the supporting section, and the second limiting groove is arranged on the transition section.

[0011] Optionally, the bottle valve seat is coaxially arranged with the bottle mouth section, and a mounting hole is formed together along the axial direction; the bottle mouth structure also includes a conversion body, which is connected to the mounting hole; the first end of the conversion body is connected to the bottle valve seat, and the second end of the conversion body is sealed and fitted to the inner side of the third limiting protrusion.

[0012] Optionally, the bottle mouth structure further includes a radial sealing component; the radial sealing component is sleeved on the outer peripheral side of the second end of the conversion body and abuts between the conversion body and the third limiting protrusion.

[0013] Optionally, the bottle mouth structure also includes an axial seal; the first end of the conversion body is provided with a flange, and the flange is located on the top of the bottle valve seat; the axial seal abuts between the flange and the bottle valve seat, and the axial seal is arranged around the mounting hole.

[0014] Optionally, the top end of the first end of the conversion body is flush with the top end of the bottle valve seat; or, the top end of the first end of the conversion body is lower than the top end of the bottle valve seat.

[0015] In a second aspect, the present invention further provides a type IV hydrogen storage bottle, comprising: a bottle mouth structure as described above.

[0016] By utilizing the technical solution of the present invention, the connecting portion of the bottle mouth section of the inner liner is connected between the second limiting protrusion and the third limiting protrusion, and the connecting portion is inserted into the limiting hole at the bottom of the bottle valve seat. On the one hand, the connecting portion and the limiting hole work together to limit the relative displacement between the bottle mouth section and the bottle valve seat in the direction from top to bottom, that is, in the axial direction of the bottle mouth section, thereby improving the axial restraining force of the bottle mouth section, avoiding the stratification of the bottle mouth section and the bottle valve seat of the inner liner, thereby avoiding leakage failure of the IV type hydrogen storage cylinder, and improving the safety and reliability of the IV type hydrogen storage cylinder. On the other hand, the second limiting protrusion is connected to the first limiting groove, the third limiting protrusion is connected to the inner side of the first limiting protrusion, the connecting portion is connected between the second limiting protrusion and the third limiting protrusion, and is inserted into the limiting hole, thereby improving the connection strength between the inner liner and the bottle valve seat, increasing the torsional moment of the inner liner, and further improving the safety and reliability of the IV type hydrogen storage cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of a bottle mouth structure according to an embodiment of the present invention;

[0019] Figure 2 This is a structural schematic diagram of a bottle valve seat from one perspective according to an embodiment of the present invention;

[0020] Figure 3 This is a structural schematic diagram of a bottle valve seat according to an embodiment of the present invention from another perspective;

[0021] Figure 4 An axial cross-sectional view of a bottle valve seat according to an embodiment of the present invention;

[0022] Figure 5 A radial cross-sectional view of a bottle valve seat according to an embodiment of the present invention;

[0023] Figure 6 for Figure 5 A partial enlarged view of the middle A;

[0024] Figure 7 A schematic diagram of the structure of an inner container according to an embodiment of the present invention;

[0025] Figure 8 An axial cross-sectional view of an inner container according to an embodiment of the present invention;

[0026] Fig. 9 for Figure 8 A partial enlarged view of point B in the middle;

[0027] Fig.10 The figure is a schematic structural diagram of a converter according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Bottle valve seat; 10. Bottle valve seat center hole; 11. First center section; 111. First limiting convex part; 112. First limiting groove; 113. Limiting hole; 114. Second sealing groove; 115. First internal thread section; 116. Plane section; 117. Narrow neck section; 12. Support section; 121. Second limiting groove;

[0030] 2. liner; 20. bottle mouth; 21. bottle mouth section; 211. second limiting convex part; 212. third limiting convex part; 213. connecting part; 22. transition section; 221. fourth limiting convex part; 23. main body section;

[0031] 3. Converter; 30. Converter center hole; 31. Second center section; 311. First sealing groove; 312. External thread section; 32. Flange; 321. Second internal thread section; 322. Third sealing groove; 323. Boss section;

[0032] 4. Carbon fiber bearing layer;

[0033] 5. Glass fiber protective layer;

[0034] 6. radial sealing assembly; 61. radial sealing ring; 62. retaining ring;

[0035] 7. Axial seal;

[0036] 8. Mounting hole. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] The inner liner of the Type IV gas cylinder in the related art is a plastic liner, and the axial restraint force at the mouth of the plastic liner is insufficient. After installing the bottle mouth valve and other structures, the mouth of the plastic liner is easily deformed due to external extrusion force, resulting in separation of the joint between the inner liner mouth and the bottle valve seat, resulting in leakage failure, affecting the safety and reliability of the Type IV hydrogen storage cylinder.

[0039] The present invention provides a bottle mouth structure and a type IV hydrogen storage bottle using the same, so as to solve the problem that the axial restraint force at the bottle mouth of the plastic liner of the type IV hydrogen storage bottle is insufficient, thereby reducing the safety and reliability of the type IV hydrogen storage bottle.

[0040] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0041] According to an embodiment of the present invention, on the one hand, a bottle mouth structure is provided, which is applied to a Type IV hydrogen storage bottle. The bottle mouth structure includes a bottle valve seat 1 and an inner liner 2, wherein the bottle valve seat 1 is usually made of metal, and the inner liner 2 is usually made of plastic.

[0042] Specifically, the bottom of the bottle valve seat 1 is provided with a first limiting protrusion 111 and a first limiting groove 112, and the outer side of the first limiting protrusion 111 forms the side wall of the first limiting groove 112. That is, the first limiting protrusion 111 is adjacent to the inner side of the first limiting groove 112, the side of the first limiting protrusion 111 close to the first limiting groove 112 is the outer side of the first limiting protrusion 111, and the side of the first limiting protrusion 111 away from the first limiting groove 112 is the inner side of the first limiting protrusion 111.

[0043] The first limiting protrusion 111 is provided with at least one limiting hole 113, which connects the outer side and the inner side of the first limiting protrusion 111. That is, the limiting hole 113 connects the first limiting groove 112 and the side of the first limiting protrusion 111 away from the first limiting groove 112.

[0044] like Figure 2-6 As shown, a bottle valve seat center hole 10 is provided at the center of the bottle valve seat 1, and the bottle valve seat center hole 10 axially penetrates the bottle valve seat 1. The first limiting protrusion 111 and the first limiting groove 112 are sequentially arranged along the radial direction of the bottle valve seat center hole 10, and the side of the first limiting protrusion 111 facing the bottle valve seat center hole 10 is the inner side of the first limiting protrusion 111; the side of the first limiting protrusion 111 facing the first limiting groove 112 is the outer side of the first limiting protrusion 111.

[0045] Further, the liner 2 includes a bottle mouth section 21, which includes a second limiting protrusion 211, a third limiting protrusion 212 and at least one connecting portion 213, and the connecting portion 213 is connected between the first limiting protrusion 111 and the second limiting protrusion 211. Among them, the second limiting protrusion 211 is connected to the first limiting groove 112, and the third limiting protrusion 212 is connected to the inner side of the first limiting protrusion 111, that is, the third limiting protrusion 212 is located in the central hole 10 of the bottle valve seat, and the connecting portion 213 is penetrated in the limiting hole 113.

[0046] like Figure 7-9As shown, the bottle mouth section 21 has a bottle mouth 20, and the bottle mouth 20 is connected to the interior of the liner 2. It can be understood that the liner 2 is connected to the bottom of the bottle valve seat 1 through the bottle mouth section 21, and the bottle mouth 20 corresponds to and is connected to the central hole 10 of the bottle valve seat, so that the bottle mouth valve and other structures are connected to the interior of the liner 2 through the bottle mouth 20 to achieve the output of hydrogen energy.

[0047] In this embodiment, the bottle mouth section 21 of the inner liner 2 is connected to the bottom of the bottle valve seat 1, and the connecting portion 213 of the bottle mouth section 21 is connected between the second limiting protrusion 211 and the third limiting protrusion 212, and the connecting portion 213 is inserted into the limiting hole 113 at the bottom of the bottle valve seat 1. On the one hand, the connecting portion 213 and the limiting hole 113 work together to limit the relative displacement of the bottle mouth section 21 and the bottle valve seat 1 in the direction from top to bottom, that is, in the axial direction of the bottle mouth section 21, thereby improving the axial restraining force of the bottle mouth section 21, avoiding the stratification of the bottle mouth section 21 of the inner liner 2 and the bottle valve seat 1, thereby avoiding leakage failure of the IV type hydrogen storage cylinder, and improving the safety and reliability of the IV type hydrogen storage cylinder. On the other hand, the second limiting protrusion 211 is connected to the first limiting groove 112, the third limiting protrusion 212 is connected to the inner side of the first limiting protrusion 111, and the connecting portion 213 is passed through the limiting hole 113, thereby improving the connection strength between the inner liner 2 and the bottle valve seat 1, increasing the torsional moment of the inner liner 2, and further improving the safety and reliability of the Type IV hydrogen storage cylinder.

[0048] The inner liner 2 can be integrally injection molded at the bottom of the bottle valve seat 1. During injection molding, the bottle valve seat 1 is placed in the mold, and the injection molding material of the inner liner 2 flows and fills the first limiting groove 112, the limiting hole 113 and the inner side of the first limiting protrusion 111 to form the second limiting protrusion 211, the connecting part 213 and the third limiting protrusion 212, without the need for special processing, and the production cost is low.

[0049] It can be understood that the shape structure of the second limiting protrusion 211 is compatible with the shape structure of the first limiting groove 112, the shape structure of the third limiting protrusion 212 is compatible with the shape structure of the first limiting protrusion 111, and the shape structure of the connecting portion 213 is compatible with the shape structure of the limiting hole 113.

[0050] In some embodiments, the bottle valve seat 1 is coaxially arranged with the bottle mouth section 21, and a mounting hole 8 is formed together along the axial direction. That is, the central hole 10 of the bottle valve seat and the bottle mouth 20 together form the mounting hole 8, so as to facilitate the installation of the bottle mouth valve and other structures. Among them, the first limiting protrusion 111, the first limiting groove 112, the second limiting protrusion 211, and the third limiting protrusion 212 are all annular, and are all arranged around the mounting hole 8, preferably coaxially arranged around the mounting hole 8. The first limiting protrusion 111 and the first limiting groove 112 are constructed in an annular shape, which is convenient for simplifying the structure of the bottle valve seat 1 and facilitating processing and manufacturing.

[0051] In some embodiments not shown, along the radial direction of the mounting hole 8, multiple groups of the first limiting protrusions 111 and the first limiting grooves 112 can be sequentially arranged from the inside to the outside, and the first limiting protrusions 111 in each group are provided with the above-mentioned limiting holes 113. Correspondingly, the bottle mouth section 21 forms multiple groups of the above-mentioned second limiting protrusions 211 and third limiting protrusions 212, and each group of the second limiting protrusions 211 and the third limiting protrusions 212 is connected with the above-mentioned connecting portion 213, so as to further improve the axial restraining force of the bottle mouth 20.

[0052] In some embodiments not shown, the first limiting protrusion 111 may be constructed as an annular structure, the first limiting groove 112 may be constructed as an arcuate groove structure extending circumferentially around the first limiting protrusion 111, and a plurality of the arcuate groove structures may be arranged circumferentially around the first limiting protrusion 111.

[0053] More specifically, in some embodiments, the first limiting protrusion 111, the first limiting groove 112, the second limiting protrusion 211, and the third limiting protrusion 212 are all annular. Figure 6 As shown, along the circumference of the first limiting protrusion 111, a plurality of limiting holes 113 are arranged at intervals, preferably evenly spaced, to improve the connection strength between the bottle mouth section 21 and the bottle valve seat 1. The present invention does not specifically limit the number of the limiting holes 113 arranged along the circumference of the first limiting protrusion 111, and the number of the limiting holes 113 can be 1, 2, 3, 4 or other numbers.

[0054] In some embodiments, the first limiting protrusion 111, the first limiting groove 112, the second limiting protrusion 211, and the third limiting protrusion 212 are all annular. Figure 4 As shown, along the axial direction of the first limiting protrusion 111, a plurality of limiting holes 113 are arranged at intervals, preferably evenly spaced, to further improve the connection strength between the bottle mouth section 21 and the bottle valve seat 1. The present invention does not specifically limit the number of the limiting holes 113 arranged along the axial direction of the first limiting protrusion 111, and the number of the limiting holes 113 may be 1, 2, 3, 4 or other numbers.

[0055] In some embodiments, the limiting hole 113 is in an arc shape and extends along the circumference of the first limiting protrusion 111. The present invention does not specifically limit the size of the central angle of the arc-shaped limiting hole 113, and the central angle can be any angle less than 180°. For example, the central angle can be 30°, 45°, 60°, 90°, etc.

[0056] It should be noted that the limiting hole 113 may also be in a strip-shaped structure, a circular hole-shaped structure, etc. The present invention does not specifically limit the shape and structure of the limiting hole 113, as long as it can cooperate with the connecting portion 213 to perform the function of axially constraining the bottle mouth section 21.

[0057] For example, Figure 3-6 As shown, along the circumference of the first limiting protrusion 111, two limiting holes 113 are arranged at intervals, and along the axial direction of the first limiting protrusion 111, two limiting holes 113 are arranged at intervals. That is, the first limiting protrusion 111 is provided with four limiting holes 113, wherein each limiting hole 113 is an arc-shaped hole structure with a central angle of 90°.

[0058] It can be understood that the shape of the connection part 213 depends on the shape of the limiting hole 113. When the limiting hole 113 is configured as a circular arc hole structure, the connection part 213 is correspondingly configured as a circular arc plate structure. In addition, the number of connection parts 213 depends on the number of limiting holes 113. The present invention does not specifically limit the number of limiting holes 113 and connection parts 213, as long as the axial constraint requirements of the inner liner 2 are met.

[0059] In some embodiments, the bottle valve seat 1 includes a first central segment 11 and a support segment 12, a first limiting protrusion 111 and a first limiting groove 112 are arranged at the bottom of the first central segment 11, and the bottle valve seat center hole 10 is formed in the middle of the first central segment 11 and axially penetrates the first central segment 11. The support segment 12 is connected to the bottom of the first central segment 11 and extends around the outer peripheral side of the first central segment 11. Specifically, the support segment 12 is configured as an annular structure extending around the first central segment 11.

[0060] Furthermore, the liner 2 includes a transition section 22 extending around the outer peripheral side of the bottle mouth section 21. Specifically, the transition section 22 is constructed as an annular structure extending around the bottle mouth section 21. The transition section 22 covers and is connected to the bottom of the support section 12, and the bottom includes the bottom end face of the support section 12 and the side end face close to the bottom. In the direction perpendicular to the top to the bottom of the support section 12, that is, in the radial direction of the support section 12, a concave-convex structure is provided at the connection between the transition section 22 and the support section 12 to further improve the axial restraint force between the bottle valve seat 1 and the bottle mouth section 21, and ensure the connection strength between the bottle valve seat 1 and the liner 2.

[0061] In some embodiments, the concave-convex structure includes a second limiting groove 121 and a fourth limiting convex portion 221. Figure 3 and Figure 8 As shown, the second limiting groove 121 can be arranged on the outer peripheral side of the support segment 12, that is, the side end face of the support segment 12 away from the first center segment 11; the fourth limiting protrusion 221 can be arranged on the transition segment 22, that is, along the radial direction, the side of the transition segment 22 facing the support segment 12.

[0062] In some embodiments not shown, the fourth limiting protrusion 221 may also be provided on the outer peripheral side of the supporting section 12 , and correspondingly, the second limiting groove 121 is provided on the transition section 22 .

[0063] Exemplarily, the second limiting groove 121 can be constructed as an annular groove structure, an arc groove structure, a strip groove structure, etc., and the shape and structure of the fourth limiting protrusion 221 are adapted to the second limiting groove 121 .

[0064] In some embodiments, the liner 2 further includes a main body section 23, and the transition section 22 is connected between the bottle mouth section 21 and the main body section 23. An annular recess is formed at the top of the transition section 22, and the support section 12 of the bottle mouth valve is connected to the annular recess.

[0065] Furthermore, in some embodiments, the bottle mouth structure further includes a conversion body 3, and the bottle valve seat 1, the bottle mouth section 21 and the conversion body 3 are coaxially arranged. Specifically, the conversion body 3 is connected to the mounting hole 8, the first end of the conversion body 3 is connected to the bottle valve seat 1, and the second end of the conversion body 3 is sealed and matched to the inner side of the third limiting protrusion 212.

[0066] The material of the converter 3 is usually metal. Fig. 9 As shown, a converter body center hole 30 is provided at the center of the converter body 3, and the converter body center hole 30 axially penetrates the converter body 3. The center hole of the converter body 3 is used to install a bottle mouth valve to realize the output of hydrogen energy.

[0067] In this way, the third limiting protrusion 212 of the bottle mouth section 21 is clamped between the first limiting protrusion 111 of the bottle valve seat 1 and the second end of the converter 3. The first limiting protrusion 111 and the converter 3 jointly limit the deformation of the third limiting protrusion 212, thereby improving the sealing effect between the converter 3 and the bottle mouth section 21, and further ensuring the safety and reliability of the Type IV hydrogen storage cylinder.

[0068] In some embodiments, a first internal thread section 115 is provided in the central hole 10 of the bottle valve seat 1, and accordingly, an external thread section 312 is provided at the first end of the conversion body 3, and the external thread section 312 of the conversion body 3 is threadedly connected to the first internal thread section 115 of the bottle valve seat 1.

[0069] In some embodiments, the conversion body center hole 30 of the conversion body 3 is provided with a second internal thread section 321, and the second internal thread section 321 is used for threaded connection with the bottle mouth valve.

[0070] In some embodiments, the bottle mouth structure also includes a radial sealing assembly 6, which is sleeved on the outer peripheral side of the second end of the converter 3 and abuts between the converter 3 and the third limiting protrusion 212 to achieve a sealing fit between the second end of the converter 3 and the bottle mouth section 21.

[0071] Specifically, a first sealing groove 311 is provided on the outer peripheral side of the second end of the conversion body 3, and the radial sealing assembly 6 is arranged in the first sealing groove 311. Exemplarily, the first sealing groove 311 is annular, and the radial sealing assembly 6 includes a radial sealing ring 61 and a retaining ring 62, which are both arranged in the first sealing groove 311 to improve the sealing effect.

[0072] In which, along the axial direction of the converter 3, a plurality of first sealing grooves 311 may be arranged at intervals, and correspondingly, a plurality of radial sealing components 6 may also be arranged correspondingly. Figure 1 and Fig.10 As shown, along the axial direction, two first sealing grooves 311 are arranged at intervals, and two radial sealing assemblies 6 are correspondingly arranged, and the two radial sealing assemblies 6 are respectively arranged in the two first sealing grooves 311. It can be understood that the number of the first sealing grooves 311 and the radial sealing assemblies 6 can also be one, three or other numbers.

[0073] In some embodiments, at the seal fit between the second end of the converter 3 and the third limiting protrusion 212, the outer peripheral surface of the converter 3 is inclined toward the middle in the direction close to the bottle mouth section 21, and accordingly, the inner side surface of the third limiting protrusion 212, that is, the surface on the side that seals with the converter 3, is also inclined toward the middle. With such an arrangement, when the converter 3 is screwed by the tool during assembly, the interference of the radial sealing ring 61 installed on the converter 3 gradually increases during the pressing process, thereby further improving the sealing effect.

[0074] Specifically, the conversion body 3 includes a second central segment 31 and a flange 32 extending around the outer circumference of the second central segment 31, wherein the flange 32 is located at one axial end of the second central segment 31, specifically, at the top of the second central segment 31. The flange 32 and the top structure of the second central segment 31 together form the first end of the conversion body 3, and the bottom structure of the second central segment 31 forms the second end of the conversion body 3.

[0075] The external thread section 312 and the first sealing groove 311 are both formed on the outer peripheral side of the second central section 31 and are located on one axial side of the flange 32, specifically below the flange 32. The first sealing groove 311 is located at one end of the external thread section 312 away from the flange 32. The conversion body center hole 30 is formed at the center of the second central section 31.

[0076] In some embodiments, the bottle mouth structure further includes an axial seal 7, and the first end of the converter 3 is provided with the above-mentioned flange 32, and the flange 32 is located at the top of the bottle valve seat 1. The axial seal 7 abuts between the flange 32 and the bottle valve seat 1, and the axial seal 7 is arranged around the mounting hole 8. The flange 32 is provided and the axial seal 7 is provided between the flange 32 and the bottle valve seat 1, so as to ensure the sealing between the converter 3 and the bottle valve seat 1, thereby improving the sealing of the bottle mouth structure as a whole, and ensuring the safety and reliability of the IV type hydrogen storage cylinder. Exemplarily, the axial seal 7 can be a sealing ring.

[0077] Exemplarily, a second sealing groove 114 is provided at the top of the bottle valve seat 1; or, exemplary, a second sealing groove 114 is provided at the bottom of the flange 32. The second sealing groove 114 is annular, and the axial seal 7 is disposed in the second sealing groove 114 and abuts between the flange 32 and the bottle valve seat 1.

[0078] In some embodiments, a third sealing groove 322 may be further provided on the top of the conversion body 3. The third sealing groove 322 is annular and arranged around the conversion body center hole 30. The third sealing groove 322 is used to install a sealing ring to achieve sealing cooperation between the conversion body 3 and the bottle mouth valve.

[0079] In some embodiments, a boss portion 323 may be further provided on the top of the converter 3, and the boss portion 323 is arranged around the converter center hole 30. The outer peripheral side of the boss portion 323 is in a hexagonal column shape, which is convenient for the disassembly tool to clamp the converter 3, thereby improving the convenience of disassembly and assembly of the converter 3.

[0080] In some embodiments, the top of the first end of the conversion body 3 is flush with the top of the bottle valve seat 1; or, the top of the first end of the conversion body 3 is lower than the top of the bottle valve seat 1. This arrangement can prevent the conversion body 3 from being loosened due to external force impact, resulting in sealing failure, and further ensure the sealing effect of the bottle mouth structure.

[0081] Exemplarily, a sink groove is provided at the top of the bottle valve seat 1, the conversion body 3 is threadedly connected to the bottle valve seat center hole 10 of the bottle valve seat 1, and the flange 32 of the conversion body 3 is connected to the sink groove. In the axial direction, the depth of the sink groove should be greater than or equal to the thickness of the flange 32 to prevent the top of the conversion body 3 from protruding from the bottle valve seat 1.

[0082] In some embodiments, a flat surface 116 is provided on the outer peripheral side of the first central section 11 of the bottle valve seat 1 to facilitate the fixing of the bottle valve seat 1 and the assembly and disassembly of the conversion body 3 in the bottle valve seat 1. Two flat surfaces 116 may be provided, and the two flat surfaces 116 are symmetrically arranged along the radial direction of the bottle valve seat 1.

[0083] In some embodiments, a carbon fiber bearing layer 4 and a glass fiber protective layer 5 are provided on the outer side of the inner liner 2. Both the carbon fiber bearing layer 4 and the glass fiber protective layer 5 can be made by a winding process to ensure the strength of the Type IV hydrogen storage bottle.

[0084] The bottle valve seat 1 further includes a neck portion 117, which is located at the junction of the first central section 11 and the support section 12. The neck portion 117 is specifically located at the outer peripheral side of the first central section 11 and is formed as an annular recess. The carbon fiber bearing layer 4 can be embedded in the neck portion 117 to facilitate axial fixation of the carbon fiber bearing layer 4.

[0085] According to an embodiment of the present invention, in another aspect, there is also provided a type IV hydrogen storage bottle, comprising the bottle mouth structure described in any of the above embodiments. Since the type IV hydrogen storage bottle of the present invention comprises the above bottle mouth structure, it has the same technical effect as the bottle mouth structure of the present invention, and will not be described in detail here.

[0086] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A bottle mouth structure, applied to a type IV hydrogen storage bottle, characterized in that: include: A bottle valve seat (1), wherein a first limiting protrusion (111) and a first limiting groove (112) are provided at the bottom of the bottle valve seat (1), and the outer side of the first limiting protrusion (111) forms a side wall of the first limiting groove (112); at least one limiting hole (113) is provided on the first limiting protrusion (111), and the limiting hole (113) communicates the inner side and the outer side of the first limiting protrusion (111); The inner liner (2) comprises a bottle mouth section (21); the bottle mouth section (21) comprises a second position-limiting protrusion (211), a third position-limiting protrusion (212) and at least one connecting portion (213); the connecting portion (213) is connected between the first position-limiting protrusion (111) and the second position-limiting protrusion (211); The second limiting protrusion (211) is connected to the first limiting groove (112), the third limiting protrusion (212) is connected to the inner side of the first limiting protrusion (111), and the connecting portion (213) is inserted into the limiting hole (113).

2. The bottle mouth structure according to claim 1, characterized in that: The bottle valve seat (1) and the bottle mouth section (21) are coaxially arranged and a mounting hole (8) is formed together along the axial direction; The first limiting protrusion (111), the first limiting groove (112), the second limiting protrusion (211), and the third limiting protrusion (212) are all annular in shape and are arranged around the mounting hole (8).

3. The bottle mouth structure according to claim 2, characterized in that: Along the circumference of the first limiting protrusion (111), a plurality of limiting holes (113) are arranged at intervals; and / or, Along the axial direction of the first limiting protrusion (111), a plurality of limiting holes (113) are arranged at intervals; and / or, The limiting hole (113) is in an arc shape and extends along the circumference of the first limiting protrusion (111).

4. The bottle mouth structure according to claim 1, characterized in that: The bottle valve seat (1) comprises a first central section (11) and a supporting section (12); the first limiting protrusion (111) and the first limiting groove (112) are arranged at the bottom of the first central section (11); the supporting section (12) is connected to the bottom of the first central section (11) and extends around the outer circumference of the first central section (11); The inner liner (2) comprises a transition section (22) extending around the outer peripheral side of the bottle mouth section (21), and the transition section (22) covers and is connected to the bottom of the support section (12); in a direction perpendicular to the top to the bottom of the support section (12), a concave-convex structure is provided at the connection between the transition section (22) and the support section (12).

5. The bottle mouth structure according to claim 4, characterized in that: The concave-convex structure comprises a second limiting groove (121) and a fourth limiting convex portion (221); the second limiting groove (121) is arranged on the outer peripheral side of the supporting section (12), and the fourth limiting convex portion (221) is arranged on the transition section (22); or, The fourth limiting protrusion (221) is arranged on the outer peripheral side of the supporting section (12), and the second limiting groove (121) is arranged on the transition section (22).

6. The bottle mouth structure according to any one of claims 1 to 5, characterized in that: The bottle valve seat (1) and the bottle mouth section (21) are coaxially arranged and a mounting hole (8) is formed together along the axial direction; The bottle mouth structure also includes a conversion body (3), which is connected to the mounting hole (8); a first end of the conversion body (3) is connected to the bottle valve seat (1), and a second end of the conversion body (3) is sealed and fitted to the inner side of the third limiting protrusion (212).

7. The bottle mouth structure according to claim 6, characterized in that: The bottle mouth structure also includes a radial sealing component (6); The radial sealing component (6) is sleeved on the outer peripheral side of the second end of the conversion body (3) and abuts between the conversion body (3) and the third limiting protrusion (212).

8. The bottle mouth structure according to claim 6, characterized in that: The bottle mouth structure also includes an axial sealing member (7); The first end of the conversion body (3) is provided with a flange (32), and the flange (32) is located on the top of the bottle valve seat (1); the axial seal (7) is abutted between the flange (32) and the bottle valve seat (1), and the axial seal (7) is arranged around the mounting hole (8).

9. The bottle mouth structure according to claim 6, characterized in that: The top end of the first end of the conversion body (3) is flush with the top end of the bottle valve seat (1); or, the top end of the first end of the conversion body (3) is lower than the top end of the bottle valve seat (1).

10. A type IV hydrogen storage bottle, characterized in that: include: The bottle mouth structure according to any one of claims 1 to 9.

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