阅读说明：本技术 非金属内胆缠绕气瓶的端部密封结构 (End sealing structure of gas cylinder wound by non-metallic liner ) 是由 刘雅振 张继恒 石凤文 张增营 刘妍 于 2019-06-13 设计创作，主要内容包括：本发明公开了一种非金属内胆缠绕气瓶的端部密封结构,包括复合层、阀座、阀座适配器,阀座适配器耦接至阀座的气瓶内胆。阀座与适配器间通过螺纹密封连接,适配器与气瓶内胆间通过O型圈连接。适配器与气瓶阀门间以螺纹密封连接。该非金属复合气瓶端部密封结构的设计保证气瓶的使用安全,简化了生产工艺,解决气瓶在使用过程中出现的密封失效问题。(The invention discloses an end sealing structure of a gas cylinder wound by a non-metal liner, which comprises a composite layer, a valve seat and a valve seat adapter, wherein the valve seat adapter is coupled to the gas cylinder liner of the valve seat. The valve seat is connected with the adapter in a sealing mode through threads, and the adapter is connected with the inner container of the gas cylinder through an O-shaped ring. The adapter is connected with the gas cylinder valve in a threaded sealing way. The design of the end sealing structure of the nonmetal composite gas cylinder ensures the use safety of the gas cylinder, simplifies the production process and solves the problem of sealing failure of the gas cylinder in the use process.)

1. The utility model provides an end seal structure of nonmetal inner bag winding gas cylinder, nonmetal inner bag winding gas cylinder include inner bag and the composite bed of parcel at the inner bag surface, its characterized in that, end seal structure includes:

the valve seat is of a sleeve structure and is provided with a bottom flange and a neck, the inner surface of the bottom flange of the valve seat is sleeved on the outer wall of the opening of the liner, and the end surface of the composite layer at the opening position of the liner is tightly attached to the outer surface of the neck; and

and the valve seat adapter is in sealing fit with the inner ring of the valve seat and then extends to the opening position of the inner container.

2. An end seal structure for a non-metallic liner wrapped gas cylinder according to claim 1, characterized in that the valve seat flange and the neck are integrally formed.

3. The end sealing structure of the gas cylinder wound by the non-metal liner according to claim 1, wherein the bottom of the inner ring wall of the valve seat is provided with an inner concave section, the end necking section of the liner is inserted into the inner concave section of the valve seat, and the inner wall of the end necking section of the liner is flush with the inner ring wall of the valve seat.

4. The end sealing structure of the gas cylinder wound by the non-metal liner according to claim 3, characterized in that an annular groove is formed in the step of the inner concave section of the inner ring wall of the valve seat, an outward-turning convex hook is arranged on the end necking section of the liner, and the outward-turning convex hook is clamped in the annular groove.

5. An end seal structure of a non-metallic liner wrapped gas cylinder according to claim 4, characterized in that a composite layer anchoring structure is further provided on the valve seat.

6. The end sealing structure of a cylinder wound by a non-metallic liner according to claim 5, wherein the annular groove is semicircular, square or triangular, and the shape of the annular groove is matched with that of the protruding hook.

7. An end seal structure for a non-metallic liner wrapped gas cylinder according to claim 1, wherein the inner surface of the neck of the valve seat is in threaded sealing engagement with the outer surface of the adapter of the valve seat.

8. An end seal structure of a non-metal liner wrapped gas cylinder according to claim 5, characterized in that the composite layer anchoring structure is a protrusion with a triangular or M-shaped cross section.

9. The end seal structure of a non-metallic liner wrapped gas cylinder according to claim 8, wherein the sharp corners of the raised structure are chamfered or rounded.

10. An end sealing structure of a cylinder wound by a non-metal liner according to claim 1, characterized in that an annular sealing groove is formed on the outer surface of the valve seat adapter and used for assembling an O-shaped ring and a retainer ring.

Technical Field

The invention relates to the technical field of design and manufacture of gas cylinders, in particular to an end sealing structure of a gas cylinder with a fully-wound non-metal liner.

Background

Gas cylinders are generally referred to as mobile pressure vessels that are intended to be re-filled for use with permanent, liquefied or dissolved gases. With the development of composite material forming technology and the market development trend of light weight, the composite gas cylinder, especially the gas cylinder with a non-metal liner fully wound, has been the mainstream internationally. The composite gas cylinder consists of a composite layer and an inner container. Wherein, the gas type inner container is a gas cylinder made of non-metallic materials. Compared with other gas cylinder products, the non-metal liner wound gas cylinder has the following advantages: the corrosion-resistant steel has the advantages of no stress corrosion and hydrogen embrittlement, excellent fatigue resistance, excellent corrosion resistance (acid and alkali corrosion resistance) and excellent impact resistance.

The gas cylinder inner bag is non-metallic material, can't be directly with valve sealing connection, therefore the gas cylinder manufacturer has designed the disk seat structure in order to seal the kneck of inner bag and valve. The sealing failure between the valve seat and the inner container can cause the gas cylinder to leak, and further danger is generated.

The failure of the non-metal liner composite gas cylinder mainly occurs in the sealing failure between the non-metal liner and the metal valve seat, so the design of the sealing structure at the end part of the gas cylinder is very important.

The valve seat structure that present conventional use is for designing the connected mode that is used for strengthening complicated structures such as the connection locked groove between inner bag and the valve seat on the valve seat flange, guarantees the effective sealed of gas cylinder through the joint strength of reinforcing inner bag and valve seat. The valve seat structure disclosed in the prior art chinese patent CN 102282409B is an example to illustrate the defects therein: 1. the nonmetal inner container has certain gas permeability, and the inner container is possibly gathered in the lock groove structure after permeating, so that the inner container is extruded out of the lock groove structure when the pressure in the gas cylinder is reduced, and the sealing failure is caused. 2. The hole designed on the inner side wall of the valve seat for improving the sealing failure under high pressure can enable the inner container of the gas cylinder to bear great torsional force in the valve installation process, and local stress concentration of the inner container can be caused, so that the sealing failure is caused.

Disclosure of Invention

The invention aims to provide an end sealing structure of a gas cylinder with a fully-wound non-metal inner container, which solves the problem of sealing failure of the gas cylinder in the using process, and the design of the end sealing structure of the non-metal composite gas cylinder ensures the use safety of the gas cylinder and simplifies the production process.

In order to achieve the purpose, the invention designs a technical scheme for solving the problem of sealing aging of the gas cylinder in the using process, the nonmetal liner is wound on an end sealing structure of the gas cylinder, the gas cylinder comprises a liner and a composite layer wrapped on the outer surface of the liner, the end sealing structure comprises a valve seat, the valve seat is of a sleeve structure and is provided with a bottom flange and a neck, the inner surface of the bottom flange of the valve seat is sleeved on the outer wall of an opening of the liner, and the end face of the composite layer at the opening position of the liner is tightly attached to the outer surface of the neck. The gas cylinder end sealing structure further comprises a valve seat adapter which extends to the opening position of the inner container after being in sealing fit with the inner ring of the valve seat.

In the above solution, the composite layer 110, the valve seat 120, the valve seat adapter 130, and the cylinder liner 140 coupled to the valve seat. The valve seat is connected with the adapter in a sealing mode through threads, and the adapter is sealed with the inner container of the gas cylinder through sealing structures such as O-shaped rings, O-shaped rings and check rings which are arranged on the adapter. The valve seat and the adapter can be made of stainless steel, aluminum, copper and other metals and are formed by spinning, stamping, turning, 3D printing and the like. The inner container of the gas cylinder can be made of plastics or rubber such as polyethylene, nylon and the like, and the forming mode can be rotary molding, blow molding, injection molding, extrusion, mould pressing and the like. The inner container and the valve seat are integrally formed or are installed after being formed, then the valve seat adapter with the sealing structure is screwed into the valve seat, and finally the positioning pin is punched and installed.

Preferably, the valve seat bottom flange and the valve seat neck are integrally formed.

Preferably, the bottom of the inner ring wall of the valve seat is provided with an inward concave section, the end necking section of the inner container is inserted into the inward concave section of the valve seat, and the inner wall of the end necking section of the inner container is flush with the inner ring wall of the valve seat.

Preferably, the inner ring wall of the valve seat is provided with an annular groove at the step of the inward concave section, the end necking section of the liner is provided with an outward turning convex hook, and the outward turning convex hook is clamped in the annular groove.

Preferably, the valve seat is also provided with a composite layer anchoring structure.

Preferably, the annular groove is semicircular, square or triangular, and the shape of the annular groove is matched with that of the convex hook.

Preferably, the inner surface of the neck of the valve seat is in threaded sealing connection with the outer surface of the adapter of the valve seat.

Preferably, the composite anchoring structure is a protrusion having a triangular or M-shaped cross-section.

Preferably, the sharp corners of the protruding structures are designed to be chamfered or rounded.

Preferably, the outer surface of the valve seat adapter is provided with an annular sealing groove for assembling an O-shaped ring and a check ring.

Drawings

Fig. 1 is a schematic view of an end sealing structure of a gas cylinder with a non-metal liner wound thereon.

Fig. 2 is a schematic view of a base in the sealing structure of the present invention.

FIG. 3 is a schematic view of a seal structure provided by the present invention without a composite layer anchoring structure.

FIG. 4 is a cross-sectional view of the annular groove on the inner surface of the neck of the valve seat.

FIG. 5 is a schematic diagram of a convex section with a chamfer or fillet at the sharp corner.

FIG. 6 is a schematic view of a protrusion of the composite layer anchoring structure.

FIG. 7 is a schematic view of a seal configuration valve seat adapter.

FIG. 8 is a schematic view of the upper surface mounting alignment pin of the valve seat adapter.

FIG. 9 is a schematic view of the assembly of an O-ring and a retainer ring in an annular seal groove in the upper surface of the valve seat adapter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1 to 8, an end sealing structure of a gas cylinder with a non-metal liner wound is provided in an embodiment of the present invention.

As shown in fig. 1, the cylinder end sealing structure 110 is a composite layer, 120 is a valve seat, 130 is an adapter, and 140 is a liner. The valve seat and the adapter are processed by stainless steel bars. The inner container of the gas cylinder is made of high-density polyethylene, the valve seat is placed in a mold before the inner container is formed, and the valve seat and the inner container are integrally formed through a rotational molding process.

The end sealing structure comprises a valve seat, the valve seat is composed of a flange 1, a neck-shaped part 2 and a composite layer anchoring structure 3, and the end sealing structure is shown in figure 3. And for the gas cylinder with low pressure grade, the composite layer anchoring structure 3 in the valve seat structure can be omitted.

As shown in fig. 2 and 3, when the valve seat is enough to bear the pressure in the gas cylinder, the valve seat structure in the gas cylinder end sealing structure can be composed of only a flange and a neck, 110 is a composite layer, 120 is a valve seat, 130 is an adapter, and 140 is a liner. The valve seat and the adapter are processed by aluminum alloy rods. The inner container of the gas cylinder is made of nylon 6(PA6), the valve seat is firstly placed in a mould before the inner container is formed, and the valve seat and the inner container are integrally formed through a blow molding process. Thereafter, the excess portion is removed by drilling or the like, and finally, the seat adapter equipped with the seal structure is screwed in.

The valve seat is of a sleeve structure and is provided with a bottom flange and a neck, the inner surface of the bottom flange of the valve seat is sleeved on the outer wall of the opening of the liner, and the end face of the composite layer at the opening position of the liner is tightly attached to the outer surface of the neck. The cylinder liner is in contact with the lower surface 5 of the flange of the valve seat and the transition section 6 of the inner surface of the neck of the valve seat and a part of the straight section. The inner surface 6 of the neck of the valve seat is a curved surface, the straight line segment 8 is an annular groove, the section of the groove can be semicircular, square, triangular and the like, referring to fig. 4, chamfers or fillets are processed at sharp corners, referring to fig. 5.

As shown in fig. 6, an oblique section is designed above the groove between the threads connecting the valve seat and the adapter. On the inner surface 10 of the neck of the valve seat is a thread for sealing between the valve seat and the adapter. The shape of the annular groove is matched with that of the convex hook. The composite anchoring structure 3 is a protrusion with a triangular or M-shaped cross section. The sharp corners of the protruding structures are designed to be chamfered or rounded. The outer surface 7 of the neck of the valve seat is an inclined plane, and the position 11 of the neck of the valve seat is a rectangular section vertical to the end part of the valve seat.

The upper surface 4 of the flange part of the valve seat bears the load from the composite layer, and can reduce the failure mode of valve seat flying out in the burst test and reduce the whole diameter and thickness of the flange of the valve seat by matching with the anchoring structure 3 of the composite layer, thereby effectively reducing the weight and the manufacturing cost of the gas cylinder. The lower surface 5 of the composite layer is a plane, and the structure has two advantages: 1. the water can be prevented from flowing into the gas cylinder 2, and the plane structure is contacted with the inner container, so that the stress concentration and damage caused by the shearing force acting on the inner container in the test or use process can be avoided.

The gas cylinder liner contacts with the lower surface 5 of the flange of the valve seat, the transition section 6 of the inner surface of the neck of the valve seat and a part of the straight line section so as to connect the liner and the valve seat. The transition section between the neck of the valve seat and the lower surface of the flange of the valve seat is a curved surface 6, so that the flow resistance of molten plastic in the rotational molding process is reduced, and the stress concentration at the tail end of the valve seat is avoided. The annular groove at 8 positions of the straight line section of the neck of the valve seat has a semicircular cross section, so that the connection strength between the liner of the gas cylinder and the valve seat is effectively increased. The shape of the groove is processed by a fillet, so that the forming processing difficulty and the risk of incomplete fitting with the inner container are reduced. An oblique section is designed above the groove and between the threads connecting the valve seat and the adapter, so that the adapter can be conveniently screwed in. On the inner surface 10 of the neck of the valve seat is a thread for sealing between the valve seat and the adapter. The valve seat flange lower surface 5 is a flat surface. The composite anchoring structure 3 is a protrusion, and the cross section of the protrusion may be triangular. The outer surface 7 of the neck of the valve seat is a bevel, and the position 11 of the neck of the valve seat is a rectangular section vertical to the end part of the valve seat.

The valve seat adapter provides sealing connection with the nonmetal inner container, and can avoid damage to the inner container in the process of installing and disassembling the cylinder valve. The valve seat adapter and the inner container are sealed through a sealing structure, and the sealing structure comprises but is not limited to sealing structures such as an O-shaped ring and an O-shaped ring with a retainer ring. The valve seat adapter is connected with the valve seat in a sealing mode through threads. The adapter is screwed into the valve seat after the sealing structure is assembled. In the process of forming the inner container, the inner container and the valve seat are integrally formed, and redundant parts are removed through operations such as drilling and the like. During the cylinder winding process, the composite layer anchoring structure is completely covered. And finally screwing in the valve seat adapter. The valve seat and anchoring structure of the gas cylinder need to be subjected to stress checking through finite elements, and the yield stress of the selected material is not exceeded.

The composite layer anchoring structure is designed to ensure that the composite layer can completely cover the anchoring structure when the position of the anchoring structure is designed, and the anchoring structure enables the load borne by the whole valve seat to be dispersed in the composite layer, so that the risk of valve seat flying out and failure in a blasting test can be reduced, the diameter of a flange of the valve seat is reduced, and the weight and the cost of the gas cylinder are reduced. The design of the anchoring structure needs to bear the axial stress in a drop test and the end stress in the use process, and the stress is checked through finite elements, so that the yield stress of the selected material is not exceeded.

The gas cylinder end sealing structure further comprises a valve seat adapter which is in sealing fit with the inner ring of the valve seat and then extends to the opening position of the inner container. The valve seat bottom flange and the valve seat neck are integrally formed.

And an annular sealing groove is formed in the outer surface of the valve seat adapter and used for assembling the O-shaped ring 9 and the check ring 8. The valve seat flange lower surface 5 is a flat surface. The bottom of the inner ring wall of the valve seat is provided with an inward concave section, the end necking section of the inner container is inserted into the inward concave section of the valve seat, and the inner wall of the end necking section of the inner container is flush with the inner ring wall of the valve seat. An annular groove is formed in the step of the inward concave section of the inner ring wall of the valve seat, an outward turning convex hook is arranged at the end necking section of the inner container, and the outward turning convex hook is clamped in the annular groove.

As shown in fig. 7, the valve seat adapter structure includes an adapter body and a sealing structure, where the adapter 16 is a bevel and 12 is an annular groove for fitting an O-ring, a retainer ring with an O-ring, or other type of sealing structure, and the sealing structure is a radial seal. An annular groove fitted with an O-ring and a retaining ring, see fig. 9. The valve seat adapters 13 and 14 are both threads for sealing, the threads at 13 are used for sealing connection between the adapters and the valve seats, and the threads at 14 are used for sealing connection between the adapters and the gas cylinder valves. The valve seat adapter 15 is mounted in contact with the upper surface of the neck of the valve seat and is perforated at 17 after mounting to mount the dowel pins, as shown in fig. 8.

The design of the valve seat adapter can ensure that the cylinder valve can be normally detached and installed without damaging the inner container. In the structural design that the cylinder valve is directly connected with the valve seat, the liner can be damaged by the torsional force brought in the process of disassembly and assembly, and the sealing failure is caused. The mode of sealing through the sealing structures such as the O-shaped ring and the like between the valve seat adapter and the inner container of the gas cylinder is compared with the mode of directly sealing through the valve seat, so that the valve seat and the inner container are more convenient to integrally form, and the process is simplified.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of this patent does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The above description is only exemplary embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.