阅读说明：本技术 一种纤维缠绕塑料内胆储氢气瓶瓶口结构 (Fiber winding plastic inner container hydrogen storage cylinder opening structure ) 是由 李曰兵 汪志欣 朱吉琦 高增梁 马夏康 金伟娅 何兴 于 2021-08-23 设计创作，主要内容包括：一种纤维缠绕塑料内胆储氢气瓶瓶口结构,属于储氢气瓶瓶口结构技术领域。它包括塑料内胆；塑料内胆上端口处设置有金属瓶口,金属瓶口包括金属环形外壳及金属环形内衬,金属环形内衬配合插接在塑料内胆的上端口处,金属环形外壳配合设置在塑料内胆的上部,且金属环形外壳通过碳纤维层与塑料内胆缠绕固定。本发明通过设置的紧固连接结构保证了金属瓶口与塑料内胆端口在一体成型时的紧固连接；金属环形内衬与塑料内胆的结合面为锥形面,使金属环形内衬在锥形面的限位下不易向外移动与塑料内胆相脱开；另外,通过设置的止转结构能够防止金属瓶口外壳与塑料内胆之间发生相对转动；且通过设置的侧壁密封及端面密封结构,保证了整体结构的密封性。(A fiber winding plastic liner hydrogen storage cylinder mouth structure belongs to the technical field of hydrogen storage cylinder mouth structures. It comprises a plastic inner container; the upper port of the plastic liner is provided with a metal bottle mouth, the metal bottle mouth comprises a metal annular shell and a metal annular lining, the metal annular lining is matched and inserted in the upper port of the plastic liner, the metal annular shell is matched and arranged on the upper portion of the plastic liner, and the metal annular shell is wound and fixed with the plastic liner through a carbon fiber layer. The invention ensures the fastening connection of the metal bottle mouth and the plastic liner port during the integral molding through the arranged fastening connection structure; the joint surface of the metal annular lining and the plastic liner is a conical surface, so that the metal annular lining is not easy to move outwards to be separated from the plastic liner under the limit of the conical surface; in addition, the rotation stopping structure can prevent the relative rotation between the metal bottle mouth shell and the plastic liner; and through the side wall seal and the end face seal structure, the sealing performance of the whole structure is ensured.)

1. A fiber-wound plastic liner hydrogen storage cylinder mouth structure comprises a plastic liner (1); the method is characterized in that: a metal bottle mouth is arranged at the upper port of the plastic inner container (1), the metal bottle mouth comprises a metal annular shell (2) and a metal annular lining (3) which are integrally formed with the plastic inner container (1), the metal annular lining (3) is inserted at the upper port of the plastic inner container (1) in a matching way, the metal annular shell (2) is arranged at the upper part of the plastic inner container (1) in a matching way, and the metal annular shell (2) is wound and fixed with the plastic inner container (1) through a carbon fiber layer (7); the plastic inner container (1) and the metal annular shell (2) are provided with a fastening connection structure and a rotation stopping structure, and a sealing structure is arranged between the plastic inner container (1) and the metal annular lining (3).

2. The mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 1, wherein the outer side wall of the upper port of the plastic liner (1) is provided with a tooth-shaped groove (12), the inner side wall of the metal annular shell (2) is provided with a tooth-shaped boss (21) matched with the tooth-shaped groove (12), and the tooth-shaped groove (12) and the tooth-shaped boss (21) are combined to form a fastening connection structure.

3. The mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 1, characterized in that a cylindrical boss (11) is provided on the outer side wall of the upper portion of the plastic liner (1), a cylindrical groove (22) matched with the cylindrical boss (11) is provided on the inner side wall of the metal annular shell (2), and the cylindrical boss (11) and the cylindrical groove (22) are combined to form a rotation-stopping structure.

4. The bottle mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 1, wherein the sealing structure comprises a side wall sealing structure and an end face sealing structure.

5. The mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 4, wherein the metal annular liner (3) is a T-shaped annular structure, the outer side wall of the vertical section of the metal annular liner (3) is provided with a plurality of side wall sealing grooves, the side wall sealing grooves are internally provided with O-shaped sealing rings (51) and retaining rings (52), and in the process that the metal annular liner (3) is inserted and installed at the upper port of the plastic liner (1), the inner side wall of the plastic liner (1) extrudes the O-shaped sealing rings (51) and the retaining rings (52) to form a side wall sealing structure.

6. The fiber-wound plastic liner hydrogen storage cylinder mouth structure according to claim 5, characterized in that the step surface on the metal annular liner (3) is tightly attached to the top end surface of the plastic liner (1), the step surface of the metal annular liner (3) is provided with an octagonal ring groove (4), an octagonal pad (41) matched with the octagonal ring groove (4) is arranged in the octagonal ring groove (4), and when the mouth valve of the hydrogen storage cylinder is screwed into the metal mouth, the side wall of the octagonal ring groove (4) extrudes the octagonal pad (41) to form a self-tightening end face sealing structure.

7. The structure of the fiber-wound plastic liner opening of a cylinder for storing hydrogen as claimed in claim 5, wherein the inner side of the metal annular shell (2) is provided with a limiting groove, and the upper end surface of the metal annular liner (3) is tightly attached to the bottom end surface of the limiting groove.

8. The mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 1, wherein the inner side walls of the metal annular shell (2) and the metal annular liner (3) are provided with internal threads (9) for installing a mouth valve.

9. The mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 1, wherein the matching surface of the inner side wall of the plastic liner (1) and the metal annular liner (3) is a conical surface, and the included angle α between the generatrix of the conical surface and the vertical direction is 3-5 °.

10. The mouth structure of a fiber-wound plastic liner hydrogen storage cylinder according to claim 1, characterized in that a carbon fiber layer protective layer (8) is arranged outside the carbon fiber layer (7).

Technical Field

The invention belongs to the technical field of a hydrogen storage cylinder opening structure, and particularly relates to a fiber-wound plastic liner hydrogen storage cylinder opening structure.

Background

The zero emission of hydrogen energy is considered as an ultimate energy source of automobiles, and is accompanied by rapid development and industrialization of hydrogen fuel cells and electric automobiles. The IV-type hydrogen storage cylinder is a worldwide research hotspot due to the characteristics of light weight, fatigue resistance and the like, and the key of hydrogen energy application is how to design and manufacture a vehicle-mounted hydrogen storage cylinder with light weight, high pressure, high hydrogen storage mass ratio and long service life.

The existing vehicle hydrogen storage technology is that hydrogen storage cylinders store hydrogen under high pressure, the existing hydrogen storage cylinders have four forms, the hydrogen storage cylinder with a metal liner has a large weight-volume ratio and is difficult to meet the requirement of unit mass hydrogen storage density, and the hydrogen storage cylinder is not ideal for a vehicle-mounted hydrogen supply system, while a non-metal liner fiber fully-wound cylinder has the defects of infirm connection between a metal cylinder opening and the non-metal liner, unsatisfactory sealing effect, easy occurrence of hydrogen leakage risk during use and great potential safety hazard. The main technical difficulty of the high-pressure IV-type hydrogen storage cylinder is to solve the problem of hydrogen leakage caused by the cylinder mouth under the working condition of high-pressure use.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a fiber winding composite gas cylinder opening structure which has good sealing performance and is firm in connection between a metal opening and a plastic liner.

The invention provides the following technical scheme: a fiber-wound plastic liner hydrogen storage cylinder mouth structure comprises a plastic liner; the method is characterized in that: a metal bottle mouth is arranged at the upper end opening of the plastic liner, the metal bottle mouth comprises a metal annular shell and a metal annular lining which are integrally formed with the plastic liner, the metal annular lining is matched and inserted at the upper end opening of the plastic liner, the metal annular shell is matched and arranged at the upper part of the plastic liner, and the metal annular shell is wound and fixed with the plastic liner through a carbon fiber layer; and a fastening connection structure and a rotation stopping structure are arranged between the plastic inner container and the metal annular shell, and a sealing structure is arranged between the plastic inner container and the metal annular lining.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that a toothed groove is formed in the outer side wall of an upper port of the plastic liner, a toothed boss matched with the toothed groove is arranged on the inner side wall of the metal annular shell, and the toothed groove and the toothed boss are combined to form a fastening connection structure.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that a cylindrical boss is arranged on the outer side wall of the upper portion of the plastic liner, a cylindrical groove matched with the cylindrical boss is arranged on the inner side wall of the metal annular shell, and the cylindrical boss and the cylindrical groove are combined to form a rotation stopping structure.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that the sealing structure comprises a side wall sealing structure and an end face sealing structure.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that the metal annular liner is of a T-shaped annular structure, a plurality of sidewall sealing grooves are formed in the outer side wall of the vertical section of the metal annular liner, O-shaped sealing rings and retaining rings are arranged in the sidewall sealing grooves, the metal annular liner is installed at the upper end opening of the plastic liner in an inserting mode, and the inner side wall of the plastic liner extrudes the O-shaped sealing rings and the retaining rings to form a sidewall sealing structure.

The fiber-wound plastic liner hydrogen storage cylinder mouth structure is characterized in that a step surface on the metal annular liner is tightly attached to the top end surface of the plastic liner, an octagonal ring groove is formed in the step surface of the metal annular liner, an octagonal pad matched with the octagonal ring groove is arranged in the octagonal ring groove, and when a mouth valve of the hydrogen storage cylinder is screwed into a metal bottle mouth, the side wall of the octagonal ring groove extrudes the octagonal pad to form a self-tightening end face sealing structure.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that a limiting groove is formed in the inner side of the metal annular shell, and the upper end face of the metal annular liner is tightly attached to the bottom end face of the limiting groove.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that internal threads convenient for installing a cylinder opening valve are arranged on the inner side wall of the metal annular shell and the inner side wall of the metal annular liner.

The fiber-wound plastic liner hydrogen storage cylinder opening structure is characterized in that the matching surface of the inner side wall of the plastic liner and the metal annular liner is a conical surface, and the included angle alpha between the generatrix of the conical surface and the vertical direction is 3-5 degrees.

The bottleneck structure of the fiber-wound plastic liner hydrogen storage cylinder is characterized in that a carbon fiber layer protective layer is arranged on the outer side of the carbon fiber layer.

By adopting the technology, compared with the prior art, the invention has the following beneficial effects:

the inner surface of the metal annular shell is provided with the fastening connection structure matched with the mouth of the plastic liner, so that the fastening connection of the metal mouth and the port of the plastic liner during integral forming is ensured; the joint surface of the metal annular lining and the plastic liner is a conical surface, so that the metal annular lining is not easy to move outwards to be separated from the plastic liner under the limit of the conical surface; in addition, the rotation stopping structure can prevent the relative rotation between the metal bottle mouth shell and the plastic liner; and through the O-shaped sealing ring and the self-tightening octagonal gasket structure, the leakage of hydrogen from the joint between the metal bottle mouth and the plastic liner bottle mouth is effectively prevented, and the sealing performance of the structure is ensured.

Drawings

FIG. 1 is a schematic view of the overall internal structure of an embodiment of the present invention;

FIG. 2 is a schematic view of the internal structure of the plastic liner according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of a metal ring housing in an embodiment;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 5 is an enlarged schematic view of the structure at B in fig. 1.

In the figure: 1. a plastic inner container; 11. a columnar boss; 12. a toothed groove; 2. a metal annular housing; 21. a toothed boss; 22. a columnar groove; 3. a metallic annular liner; 4. an octagonal ring groove; 41. an octagonal cushion; 5. a first seal groove; 51. an O-shaped sealing ring; 52. a retainer ring; 6. a second seal groove; 7. a carbon fiber layer; 8. a carbon fiber layer protective layer; 9. an internal thread.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.

Referring to fig. 1-5, a fiber-wound plastic liner hydrogen storage cylinder mouth structure comprises a plastic liner 1, a metal mouth is installed at the upper end of the plastic liner 1, the metal mouth comprises a metal annular housing 2 and a metal annular liner 3 with a T-shaped annular structure, the metal annular housing 2 and the plastic liner 1 are integrally formed, and the lower portion of the metal annular liner 3 is inserted into the upper end of the plastic liner 1.

Wherein, the lateral wall of the plastic liner 1 is provided with a dentate groove 12, the inner lateral wall of the metal annular shell 2 is provided with a dentate boss 21 matched with the metal annular shell, the dentate groove 12 and the dentate boss 21 are combined to form a fastening connection structure, the metal annular shell 2 and the plastic liner 1 are integrally formed through a blow molding process, and during molding, the metal annular shell 2 and the plastic liner 1 are connected through the fastening connection structure.

In order to effectively prevent the relative rotation between the plastic inner container 1 and the metal annular shell 2, a cylindrical boss 11 is arranged on the outer side wall of the plastic inner container 1, a cylindrical groove 22 matched with the inner side wall of the metal annular shell 2 is arranged on the inner side wall of the metal annular shell 2, and the cylindrical boss 11 is inserted into the cylindrical groove 22 and is clamped and fixed to form a rotation stopping structure.

The joint surface of the metal annular lining 3 and the plastic liner 1 is a conical surface, so that the metal annular lining 3 is not easy to move outwards to be separated from the plastic liner 1 under the limit of the conical surface, and the included angle alpha between the generatrix of the conical surface and the vertical direction is 3-5 degrees.

Wherein, the 3 lateral walls of metal annular inside lining are equipped with first seal groove 5 and second seal groove 6, all are equipped with O type sealing washer 51 and retaining ring 52 in first seal groove 5 and the second seal groove 6, peg graft the installation between metal annular inside lining 3 and the plastic inner bag 1, extrude O type sealing washer 51 and retaining ring 52 and form lateral wall seal structure.

2 inside walls of metal annular shell and 3 inside walls of metal annular inside lining all be equipped with bottleneck valve assorted internal thread 9, closely laminate between the step face on the metal annular inside lining 3 and the top face of plastic inner bag 1, be equipped with octagonal ring groove 4 on the step face of metal annular inside lining 3, be equipped with in octagonal ring groove 4 with octagonal ring groove 4 matched with octagonal pad 41, when the bottleneck valve of hydrogen storage cylinder is twisted in the metal bottleneck, octagonal ring groove 4's lateral wall extrusion octagonal pad 41 forms the terminal surface seal structure of self-tightening formula.

Wherein, for the winding of convenient carbon fiber layer 7, the arc profile of metal ring shape shell 2 bottom is laminated with plastic inner bag 1 contact part shape mutually, and carbon fiber layer 7's outside is equipped with carbon fiber layer protective layer 8.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.