CN109210365B - Sealing structure of high-pressure composite container and high-pressure composite container - Google Patents

Abstract

The invention discloses a sealing structure of a high-pressure composite container and the high-pressure composite container, wherein the sealing structure comprises a bottle opening, a supporting lining and an end head, the bottle opening is arranged on a shell in the high-pressure composite container, external threads are arranged on the outer wall of the bottle opening, internal threads are arranged on the inner wall of the bottle opening, the supporting lining is fixedly connected with the bottle opening through the internal threads, the end head is fixedly connected with the bottle opening through the external threads, and the end head is axially abutted to the supporting lining. According to the sealing structure of the high-pressure composite container and the high-pressure composite container, the threads are arranged on the inner wall and the outer wall of the bottle opening, so that the supporting lining and the end head are connected with the bottle opening through the inner threads and the outer threads respectively, when high pressure or pressure and temperature alternation exists in the high-pressure composite container, the bottle opening cannot be loosened or separated relative to the supporting lining and the end head due to the pulling force of the inner threads and the outer threads, meanwhile, the problem of sealing reduction caused by bottle opening deformation can be solved through the pulling force of the threads, and the sealing durability is ensured.

Description

Sealing structure of high-pressure composite container and high-pressure composite container

Technical Field

The invention relates to the technical field of high-pressure composite container sealing, in particular to a sealing structure of a high-pressure composite container and the high-pressure composite container.

Background

Most taxis are modified with Compressed Natural Gas (CNG) to replace fuel oil, and the working pressure of a common CNG high-pressure gas cylinder is 20 MPa; some vehicle production manufacturers have also promoted vehicles that use CNG or CNG mixed with fuel. The automobile adopting the hydrogen medium battery is also the current hot spot, the working pressure of the hydrogen storage high-pressure gas cylinder is generally 35MPa and 70MPa, and the IV-type cylinder (high-pressure plastic liner composite container) with 70MPa is the current heat-generating spot. In addition to vehicles, high-pressure gas cylinders are also fully applied in other fields, for example, a plastic liner composite container (working pressure 2MPa) is adopted for part of liquefied petroleum gas in Europe. A large number of high-pressure containers are widely used in daily life, and the traditional pure metal or metal lining composite container has the problem of heavy weight and is difficult to transport; and the higher the storage pressure is, the more complicated the production process of the metal plastic liner is, the higher the cost is, and the risk of being corroded by high-pressure gas also exists. In order to meet the requirement of light weight, a high-pressure plastic liner composite container is produced, and due to the characteristics of plastics, the product has excellent performances of corrosion resistance, fatigue resistance, light weight and the like. Compared with a pure metal or metal lining composite container, the tightness of the high-pressure plastic liner composite container is guaranteed more rigorously, and the main reason is that the plastic liner shell and the metal end are made of different materials, so that the connection between the plastic liner and the metal end is loosened in the repeated use process, and the sealing performance is reduced.

Disclosure of Invention

The invention aims to provide a sealing structure of a high-pressure composite container and the high-pressure composite container, which are used for solving the problems in the prior art, preventing leakage and permeation of high-pressure gas medium in the high-pressure composite container and ensuring the sealing property of the container.

The invention provides a sealing structure of a high-pressure composite container, which comprises:

the bottle mouth is arranged on a shell in the high-pressure composite container, an external thread is arranged on the outer wall of the bottle mouth, and an internal thread is arranged on the inner wall of the bottle mouth;

the supporting lining is fixedly connected with the bottle mouth through the internal thread;

the end head is fixedly connected with the bottle opening through the external thread and is axially abutted to the supporting lining.

The sealing structure of the high-pressure composite container is preferably configured such that a first step is provided on an outer wall of the support liner, and the first step abuts against an end of the bottle mouth;

the end head is provided with a second step, the second step extends towards the direction of the axis of the end head, and the second step is abutted against the first step;

the supporting lining and the end head are made of metal.

The sealing structure of the high-pressure composite container as described above preferably further comprises a first sealing ring, wherein a first groove is provided on a surface of the first step abutting against the mouth, and the first sealing ring is fixedly clamped in the first groove and sealed between the first step and the end of the mouth.

The sealing structure of the high-pressure composite container as described above preferably further comprises a collar, the collar is fixedly disposed on the housing, and an inner ring of the collar abuts against the end head.

The sealing structure of the high-pressure composite container as described above, wherein preferably, the bottom surface of the collar is fixedly attached to the housing;

the end head is provided with a section which is abutted against the inner ring of the lantern ring;

the end is provided with a first cambered surface, the lantern ring is provided with a second cambered surface, and the first cambered surface, the second cambered surface and the cambered surface on the shell form a smooth and continuous cambered surface.

The invention also provides a high-pressure composite container, which comprises a shell, a bottleneck valve, a reinforcing layer and the sealing structure of the high-pressure composite container, wherein the bottleneck valve is fixedly penetrated through the supporting lining and then blocks the bottleneck, and the reinforcing layer is wrapped on the shell and the end head.

The high-pressure composite container as described above, preferably, the casing is provided with a straight portion, the bottle mouth is formed on the straight portion and is communicated with the inner cavity of the casing, and the bottom surface of the end is attached to the straight portion.

In the high-pressure composite container as described above, preferably, the shell is a single layer made of one of PA, PE, polyester, PP, POM and EVOH;

the shell and the bottle mouth are integrally formed.

The high-pressure composite container as described above, wherein the shell preferably has a layered structure of two or more layers; the shell is made of one or a combination of more than two of PA, PE, polyester, PP, POM and EVOH.

The high-pressure composite container as described above, wherein preferably, further comprising a second seal ring and a third seal ring;

a second groove is formed in the end face of the supporting lining, and the second sealing ring is fixedly clamped in the second groove and sealed between the bottleneck valve and the end face of the supporting lining;

the inner side wall of the supporting lining is provided with a third groove, and a third sealing ring is fixedly clamped in the third groove and is sealed between the bottleneck valve and the inner side wall of the supporting lining.

According to the sealing structure of the high-pressure composite container and the high-pressure composite container, the threads are arranged on the inner wall and the outer wall of the bottle opening, so that the supporting lining and the end head are connected with the bottle opening through the internal threads and the external threads respectively, when high pressure or pressure and temperature alternation exists in the high-pressure composite container, the bottle opening cannot be loosened or separated relative to the supporting lining and the end head due to the pulling force of the internal threads and the external threads, meanwhile, the problem of sealing reduction caused by bottle opening deformation can be solved through the pulling force of the threads, and the sealing durability is ensured.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a sealing structure of a high-pressure composite container according to an embodiment of the present invention;

FIG. 2 is a partial exploded view of FIG. 1;

FIG. 3 is a cross-sectional view of a seal configuration for a high pressure composite container provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of a support liner;

FIG. 5 is a cross-sectional view of a metal end;

FIG. 6 is a schematic view of a bottle mouth on a housing;

FIG. 7 is a schematic structural diagram of a high pressure composite vessel provided by an embodiment of the present invention;

FIG. 8 is a cross-sectional view of FIG. 7;

FIG. 9 is an enlarged view of a portion of FIG. 8;

fig. 10 is a cross-sectional view of the housing.

Description of reference numerals:

100-end 110-second step 120-first cambered surface

130-section 200-support liner 210-first step

300-bottle mouth 310-end 400-shell

410-straight part 500-collar 510-second cambered surface

600-bottleneck valve 700-reinforcing layer 10-first sealing ring

20-second seal ring 30-third seal ring

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 1 to 6, an embodiment of the present invention provides a sealing structure of a high-pressure composite container, including a bottle opening 300, a support liner 200, and an end head 100, where the bottle opening 300 is disposed on a casing 400 of the high-pressure composite container, an external thread is disposed on an outer wall of the bottle opening 300, an internal thread is disposed on an inner wall of the bottle opening 300, the support liner 200 is fixedly connected to the bottle opening 300 through the internal thread, the end head 100 is fixedly connected to the bottle opening 300 through the external thread, and the end head 100 is axially abutted to the support liner 200.

The casing 400 in the high-pressure composite container is generally made of plastic, the bottle mouth 300 and the casing 400 can be integrally formed, and when high pressure or pressure and temperature alternation exists in the high-pressure composite container, the plastic bottle mouth 300 is easily deformed by pressure or temperature change, so that the sealing performance of the bottle mouth 300 is reduced. In order to solve the above problems, in this embodiment, the inner wall and the outer wall of the bottle mouth 300 are both provided with threads, so that the support lining 200 and the end head 100 are respectively connected with the bottle mouth 300 through the inner threads and the outer threads, when high pressure or pressure and temperature alternation exists in the high-pressure composite container, the bottle mouth 300 cannot be loosened or separated from the support lining 200 and the end head 100 relatively due to the tensile force of the inner threads and the outer threads, and meanwhile, the problem of reduced sealing performance caused by the deformation of the bottle mouth 300 can be solved through the tensile force of the threads, and the sealing durability is ensured.

To prevent rotation of the spout 300 relative to the support liner 200 and the tip 100, the internal and external threads are counter-threaded.

Further, as shown in fig. 3 to 6, a first step 210 is provided on the outer wall of the support liner 200, and the first step 210 abuts against the end 310 of the bottle mouth 300; the tip 100 is provided with a second step 110, the second step 110 extends in the direction of the axis of the tip 100, and the second step 110 abuts against the first step 210. During installation, the support lining 200 can be screwed into the bottle mouth 300, so that the first step 210 is abutted against the end part 310 of the bottle mouth 300, the inner wall of the bottle mouth 300 can be supported, and meanwhile, the sealing performance between the support lining 200 and the bottle mouth 300 is ensured; then, the end head 100 can be fixed on the bottle mouth 300 through external threads, so that the second step 110 is pressed on the first step 210, and meanwhile, the bottom surface of the second step 110 is abutted to the shell 400, thereby realizing the support of the outer wall of the bottle mouth 300 and simultaneously ensuring the sealing performance between the end head 100 and the outer wall of the bottle mouth 300, and when high pressure or pressure and temperature alternation exists in a high-temperature composite container, the tight fit between the bottle mouth 300 and the support lining 200 or the end head 100 can be ensured through the pulling force of the internal and external threads, so that the sealing performance is ensured. In order to ensure the structural strength of the sealing structure, the supporting lining 200 and the end head 100 may be made of metal. Meanwhile, the supporting lining 200 and the end 100 which are made of metal are respectively in threaded connection with the bottle mouth 300 which is made of plastic, so that the problem that the plastic bottle mouth 300 is inconsistent with the end 100 which is made of metal and the supporting lining 200 in expansion caused by heat and contraction caused by difference of materials can be solved through thread tension, and the sealing durability is ensured.

Further, as shown in fig. 3, the sealing structure of the high-pressure composite container further includes a first sealing ring 10, a first groove is disposed on a surface of the first step 210 abutting against the mouth 300, and the first sealing ring 10 is fixedly clamped in the first groove and sealed between the first step 210 and the end of the mouth 300. Specifically, the cross-sectional diameter of the first sealing ring 10 is greater than the depth of the first groove, so that the first sealing ring 10 can protrude out of the surface of the first step 210, after the first step 210 abuts against the end 310 of the bottle mouth 300, the first sealing ring 10 can be squeezed between the first step 210 and the bottle mouth 300, and due to the fact that the end head 100, the support lining 200 and the bottle mouth 300 are assembled through internal and external threads, a meshing force which cannot move mutually is formed among the end head 100, the support lining 200 and the bottle mouth 300 through a thread force, and the meshing force ensures that the first sealing ring 10 is stably compressed for a long time, so that leakage and permeation of high-pressure gas media in a container are prevented, and sealing durability is ensured. The cross-sectional diameter of the first seal ring 10 refers to the diameter of the cross section of the first seal ring 10 in a direction parallel to the axial direction thereof.

Further, as shown in fig. 2 and 3, the sealing structure of the high pressure composite container further includes a collar 500, the collar 500 is fixedly disposed on the housing 400, and an inner ring of the collar 500 abuts against the head 100. The material of the collar 500 may be plastic, and the collar 500 may be welded to the housing 400, and may be specifically fixed to the housing 400 by hot plate welding, ultrasonic welding, or laser welding. Thus, the collar 500 seals the seal gap between the tip 100 and the housing 400, and prevents the high-pressure gas medium from leaking from the mating interface between the tip 100 and the housing 400.

Specifically, as shown in fig. 3, the bottom surface of the collar 500 is fixedly attached to the housing 400; the end head 100 is provided with a section 130, and the section 130 is abutted with the inner ring of the lantern ring 500; the inner ring surface of the lantern ring 500 can be a plane, so that the inner ring surface can be tightly attached to the section 130, and a gap is avoided; in addition, by providing the cross-section 130, a sharp corner similar to that of the collar 500 can be prevented from being formed on the tip 100, so that stress concentration due to the sharp corner can be prevented, and structural strength can be ensured.

The end 100 can be provided with the first cambered surface 120, the lantern ring 500 is provided with the second cambered surface 510, and the cambered surfaces on the first cambered surface 120, the second cambered surface 510 and the shell 400 form smooth and continuous cambered surfaces, so that the fiber winding layer can be conveniently and tightly wrapped on the surfaces of the shell 400, the lantern ring 500 and the end 100, and the gas medium leakage caused by gaps on the winding interface after the fiber winding layer is wound can be avoided.

As shown in fig. 7 and 8, the embodiment of the present invention further provides a high pressure composite container, which includes a shell 400, a finish valve 600, a reinforcing layer 700, and a sealing structure of the high pressure composite container according to any embodiment of the present invention, wherein the finish valve 600 is fixed to pass through the support liner 200 to close the finish 300, and the reinforcing layer 700 is wrapped on the shell 400 and the end head 100. The reinforcing layer 700 may be a fiber winding layer, and the reinforcing layer 700 may ensure the strength of the casing 400 and enhance the sealing performance against high-pressure gas medium.

As shown in fig. 6, 9 and 10, the housing 400 is provided with the straight portion 410, the bottle opening 300 is formed on the straight portion 410 and is communicated with the inner cavity of the housing, and the bottom surface of the end head 100 is attached to the straight portion 410, so that the end head 100 and the housing 400 can be conveniently matched, the matching interface between the end head 100 and the housing 400 is prolonged, that is, the leakage path of gas is prolonged, thereby effectively preventing the leakage or permeation of high-pressure gas in the container, and ensuring the sealing effect of the container.

The housing 400 is made of plastic and is obtained by a blow molding or rotational molding process. According to the permeation characteristics of different molecular weights for bearing high-pressure gas, the shell 400 with a layered structure may be adopted to prevent permeation of small molecule gas such as hydrogen molecules and ensure sealing performance when storing different gases, in this embodiment, the shell 400 may be a layered structure including at least two layers. The material of the case 400 may be one or a combination of two or more of PA, PE, polyester, PP, POM, and EVOH. That is, the layered structure of each layer is made of a single material, for example, the housing 400 includes three layers, which may be PA, PE, and PP. . Of course, the shell may have only one layer, and the material thereof may be any one of PA, PE, polyester, PP, POM, and EVOH. In order to facilitate the processing and molding of the bottle mouth 300, the housing 400 and the bottle mouth 300 may be integrally molded.

Further, as shown in fig. 9, the high pressure composite hermetic container may include a second seal ring 20 and a third seal ring 30; a second groove for installing a second sealing ring 20 is arranged on the end surface of the support lining 200, and the second sealing ring 20 is sealed between the bottleneck valve 600 and the end surface of the support lining 200; a third groove for installing a third sealing ring 30 is provided on the inner sidewall of the support liner 200, and the third sealing ring 30 is sealed between the mouthpiece valve 600 and the inner sidewall of the support liner 200. The bottleneck valve 600 may include a sealing cover and a fixing section, the diameter of the sealing cover is greater than that of the fixing section, so that a step surface may be formed at a joint of the sealing cover and the fixing section, when the bottleneck valve 600 is installed in the support liner 200, the step surface is pressed against an end surface of the support liner 200, so that the second sealing ring 20 is pressed between the step surface and the support liner 200, and meanwhile, the third sealing ring 30 is pressed between the fixing section and an inner side wall of the support liner 200, thereby ensuring the sealing performance of the bottleneck valve 600 after installation, and preventing a gas medium from leaking or permeating from a matching interface of the bottleneck valve 600 and the support liner 200.

The material of each sealing ring may be FKM, EPDM, FVMQ, PTFE, silicone resin, or the like, and preferably, the material of each sealing ring is one of FKM, EPDM, and PTFE.

According to the sealing structure of the high-pressure composite container and the high-pressure composite container provided by the embodiment of the invention, the threads are arranged on the inner wall and the outer wall of the bottle opening, so that the supporting lining and the end head are respectively connected with the bottle opening through the internal threads and the external threads, when high pressure or pressure and temperature alternation exists in the high-pressure composite container, the bottle opening cannot be loosened or separated relative to the supporting lining and the end head due to the pulling force of the internal threads and the external threads, meanwhile, the problem of sealing reduction caused by bottle opening deformation can be solved through the pulling force of the threads, and the sealing durability is ensured.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims (9)

1. A sealing structure of a high-pressure composite container, comprising:

the bottle mouth is arranged on a shell in the high-pressure composite container, an external thread is arranged on the outer wall of the bottle mouth, and an internal thread is arranged on the inner wall of the bottle mouth;

the supporting lining is fixedly connected with the bottle mouth through the internal thread;

the end head is fixedly connected with the bottle opening through the external thread and is abutted against the support lining in the axial direction;

the sleeve ring is fixedly arranged on the shell, and the inner ring of the sleeve ring is abutted to the end head;

the lantern ring is made of plastic, and the bottom surface of the lantern ring is fixedly attached to the shell.

2. The sealing structure of a high-pressure composite container according to claim 1, wherein a first step is arranged on the outer wall of the support liner, and the first step is abutted with the end part of the bottle mouth;

the end head is provided with a second step, the second step extends towards the direction of the axis of the end head, and the second step is abutted against the first step;

the supporting lining and the end head are made of metal.

3. The sealing structure of a high-pressure composite container according to claim 2, further comprising a first sealing ring, wherein a first groove is formed in a surface of the first step, which is abutted against the mouth, and the first sealing ring is fixedly clamped in the first groove and sealed between the first step and the end of the mouth.

4. The sealing structure of a high-pressure composite container according to claim 1, wherein a cross section is provided on the end head, and the cross section abuts against the inner ring of the collar;

the end is provided with a first cambered surface, the lantern ring is provided with a second cambered surface, and the first cambered surface, the second cambered surface and the cambered surface on the shell form a smooth and continuous cambered surface.

5. A high-pressure composite container, which is characterized by comprising a shell, a bottleneck valve, a reinforcing layer and the sealing structure of the high-pressure composite container as claimed in any one of claims 1 to 4, wherein the bottleneck valve is fixedly penetrated through the supporting lining to seal the bottleneck, and the reinforcing layer is wrapped on the shell and the end head.

6. The high pressure composite container according to claim 5, wherein the housing is provided with a flat portion, the mouth is formed on the flat portion and communicates with the inner cavity of the housing, and the bottom surface of the tip abuts against the flat portion.

7. The composite container according to claim 5, wherein the shell is a single layer made of one of PA, PE, polyester, PP, POM and EVOH;

the shell and the bottle mouth are integrally formed.

8. The high pressure composite vessel according to claim 5, wherein the shell is a layered structure of two or more layers; the shell is made of one or a combination of more than two of PA, PE, polyester, PP, POM and EVOH.

9. The high pressure composite vessel of claim 5, further comprising a second seal ring and a third seal ring;

a second groove is formed in the end face of the supporting lining, and the second sealing ring is fixedly clamped in the second groove and sealed between the bottleneck valve and the end face of the supporting lining;

the inner side wall of the supporting lining is provided with a third groove, and a third sealing ring is fixedly clamped in the third groove and is sealed between the bottleneck valve and the inner side wall of the supporting lining.

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