CN112393112B

CN112393112B - Bottleneck seal structure and high-pressure composite container

Info

Publication number: CN112393112B
Application number: CN202011444759.0A
Authority: CN
Inventors: 姜林; 高德俊; 吕昊; 翁益明; 苏卫东; 粱新龙
Original assignee: Yapp Automotive Parts Co Ltd
Current assignee: Yapp Automotive Parts Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-08-09
Anticipated expiration: 2040-12-08
Also published as: CN112393112A

Abstract

The invention discloses a bottle mouth sealing structure and a high-pressure composite container, wherein the sealing structure comprises a metal end, a first pore passage and a second pore passage are arranged on the metal end, the first pore passage is communicated with the second pore passage, and the extending directions of the first pore passage and the second pore passage are intersected. According to the bottle mouth sealing structure and the high-pressure composite container, the metal end head with the first pore channel and the second pore channel which are mutually intersected is arranged, so that the plastic shell parts in the first pore channel and the second pore channel can form an integral structure, and a net-shaped structure is formed in the metal end head, so that fastening force can be provided at each part in the metal end head, the metal end head can be in close contact with the plastic shell, the sealing performance of the connection between the metal end head and the plastic shell is ensured, and the looseness of the fit between the metal end head and the plastic shell after long-term use is prevented.

Description

Bottleneck seal structure and high-pressure composite container

Technical Field

The invention relates to a high-pressure composite container, in particular to a bottle mouth sealing structure and a 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 promoted vehicles that use CNG or CNG mixed with fuel. The automobile adopting the hydrogen medium battery is also the current hotspot, the working pressure of the hydrogen storage high-pressure gas cylinder is generally 35MPa and 70MPa, and an IV-shaped cylinder (a high-pressure plastic inner container composite container) with 70MPa is the current heating point. 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.

In view of the current situation, the connection between the metal end and the plastic inner container is a hot point and a difficult point for research. Fig. 1 is a schematic view of a high-pressure plastic liner composite container in the prior art, which includes a metal end 1, a plastic liner 2 and a fiber composite material layer 3, wherein the metal end 1 is installed on the plastic liner 2, and then is formed by winding and wrapping the fiber composite material layer 3. Fig. 2 is a view showing a sealing structure in the high pressure plastic liner composite container shown in fig. 1, and as shown in fig. 1 and 2, the large-area contact of the metal end 1 with the plastic liner 2 is technically impossible and expensive even if feasible; the sealing structure does not consider the limit on the axes of the metal end 1 and the plastic inner container 2; the structure does not consider the pressurization that the internal pressure of the plastic inner container 2 changes continuously when winding, which can cause the joint of the metal end 1 and the plastic inner container 2 to generate a gap to cause leakage, as shown by a leakage path 4 shown by an arrow in figure 2; the structure does not consider the limit of the bottle mouth when bearing the installation torque, and the bonding strength of the metal end 1 and the fiber composite material layer 3 is reduced after the installation; the escape path P of the compressed gas in the structure is short, so that the risk of escape of the compressed gas can be increased, and particularly, the compressed gas is small molecular gas CNG, hydrogen, helium and the like. Therefore, it is necessary to develop a sealing structure capable of solving the above problems.

Disclosure of Invention

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

The invention provides a bottle mouth sealing structure, which comprises:

the metal end is provided with a first pore channel and a second pore channel, the first pore channel is communicated with the second pore channel, and the extending directions of the first pore channel and the second pore channel are intersected.

The bottle mouth sealing structure as described above, preferably, the metal end includes a connecting portion and a sealing portion, the connecting portion protrudes from the sealing portion, the first duct and the second duct are both disposed on the sealing portion, and the first duct and the second duct are vertically communicated.

The bottle mouth sealing structure as described above, preferably, the metal end is provided with a mounting hole penetrating through the connecting portion and the sealing portion, a sidewall of the mounting hole is provided with an extending portion, the extending portion protrudes out of the bottom of the sealing portion, and an outer side surface of the extending portion is provided with a step.

The bottle mouth sealing structure as described above, preferably, further includes a sealing gasket, the sealing gasket is sleeved on the extending portion, the outer diameter of the sealing gasket is larger than the outer diameter of the step, and a part of the sealing gasket is pressed against the step.

The bottle mouth sealing structure as described above, preferably, further includes a locking structure, the locking structure is provided with a fixing hole and a pressing groove, the pressing groove is matched with the sealing gasket, and the fixing hole is fixedly connected with the extending portion.

The bottle mouth sealing structure as described above, preferably, the metal end is provided with a mounting hole penetrating through the connecting portion and the sealing portion, the mounting hole includes a mounting section and a connecting section, and an inner diameter of the mounting section is smaller than an inner diameter of the connecting section.

The spout sealing structure as described above, wherein preferably, the first porthole penetrates the connecting section.

The bottle mouth sealing structure as described above, wherein preferably, the first duct is provided with a plurality of first ducts, and the plurality of first ducts are uniformly distributed in the radial direction and the circumferential direction of the sealing portion;

the second duct is annular.

The invention also provides a high-pressure composite container, which comprises the bottle mouth sealing structure provided by the invention, and further comprises a plastic shell, a bottle mouth valve and a fiber winding reinforcing layer;

the plastic shell is fixedly connected with the metal end after raw materials are filled into the first pore channel and the second pore channel by adopting an injection molding or rotational molding process;

the bottleneck valve is fixedly arranged in a mounting hole on the metal end head;

the fiber winding reinforcing layer is fixedly wound on the plastic shell and the metal end.

The high-pressure composite container as described above, wherein, preferably, further comprises a sealing ring for sealing engagement with the spout valve, wherein the sealing ring is connected to the plastic shell filled on the inner wall of the mounting hole.

According to the bottle mouth sealing structure and the high-pressure composite container, the metal end head with the first pore channel and the second pore channel which are mutually intersected is arranged, so that the plastic shell parts in the first pore channel and the second pore channel can form an integral structure, and a net-shaped structure is formed in the metal end head, so that fastening force can be provided at each part in the metal end head, the metal end head can be in close contact with the plastic shell, the sealing performance of the connection between the metal end head and the plastic shell is ensured, and the looseness of the fit between the metal end head and the plastic shell after long-term use is prevented.

Drawings

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

FIG. 1 is a schematic view of a high pressure plastic liner composite container in the prior art;

FIG. 2 is a sealing structure of the high pressure plastic liner composite container shown in FIG. 1;

FIG. 3 is a schematic diagram of a metal end according to one embodiment;

FIG. 4 is a partial cross-sectional view of FIG. 3;

FIG. 5 is a schematic structural diagram (I) of a bottle mouth sealing structure according to an embodiment of the present invention;

fig. 6 is a schematic structural view (ii) of a bottle mouth sealing structure according to an embodiment of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6;

FIG. 8 is a structural schematic view (one) of a bottle mouth sealing structure according to another embodiment of the present invention;

fig. 9 is a structural schematic view (ii) of a bottle mouth sealing structure according to another embodiment of the present invention.

Description of reference numerals:

1-metal end 2-plastic inner container 3-fiber composite material layer

4-leakage path

100-metal end 110-seal 111-first channel

112-second porthole 120-connecting portion 121-extension

122-mounting hole 123-step 124-connecting section

125-mounting section 200-plastic housing 300-gasket

400-locking structure 500-fiber winding reinforced layer 600-bottle mouth valve

700-sealing 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. 3 to 9, an embodiment of the invention provides a bottle opening sealing structure, which includes a metal end 100, the metal end 100 is provided with a first hole 111 and a second hole 112, the first hole 111 is communicated with the second hole 112, and an extending direction of the first hole 111 intersects an extending direction of the second hole 112.

In the molding process of the high pressure composite container, the plastic shell 200 may be connected to the metal tip 100 through an injection molding or rotational molding process, wherein a flowable material may be molded by using a mold through the injection molding or rotational molding process, the metal tip 100 may be fixed in a proper molding position in advance before molding, the material of the plastic shell 200 may be filled into the first and

second passages

111 and 112 during the molding process, since the first and

second passages

111 and 112 intersect and communicate with each other, thereby the material in the first and

second passages

111 and 112 may be connected to each other, after the plastic shell 200 is formed by cooling, the material in the first and

second passages

111 and 112 may form an integral structure after cooling, and the plastic shell portion in the metal tip 100 may form a mesh structure, thereby providing fastening force at a plurality of portions in the metal tip 100, the metal end 100 and the plastic shell 200 can be in close contact, the connection tightness of the metal end 100 and the plastic shell 200 is ensured, and the looseness of the fit between the metal end 100 and the plastic shell 200 after long-term use is prevented.

The metal end 100 may be made of a metal material such as aluminum alloy or stainless steel, the plastic housing 200 may be made of PA, PE, PPA, polyester, PP, POM, or EVOH, and the plastic housing 200 may have a multi-layer structure, in which each layer may be made of one of the above materials, so that the multi-layer structure may effectively prevent high-pressure gas molecules such as hydrogen gas molecules from permeating through the material.

Further, the metal terminal 100 includes a connecting portion 120 and a sealing portion 110, the connecting portion 120 protrudes from the sealing portion 110, the first opening 111 and the second opening 112 are both disposed on the sealing portion 110, and the first opening 111 and the second opening 112 are vertically connected.

The sealing part 110 and the connecting part 120 can be integrally formed, the connecting part 120 is used for connecting a bottle mouth valve 600 of a high-pressure composite container, the sealing part 110 is used for being connected with the plastic shell 200 in a sealing mode, the first pore passage 111 and the second pore passage 112 are vertically communicated, and therefore the metal end 100 and the plastic shell 200 can bear the pressure of gas from the inside of the container in the positive direction, namely the bonding force between the metal end 100 and the plastic shell 200 is consistent with the direction of the gas pressure from the inside of the container, component force in other directions cannot be generated, and the metal end 100 is prevented from being loosened due to uneven stress for a long time.

Further, in a specific embodiment, as shown in fig. 5 to 7, a mounting hole 122 penetrating through the connecting portion 120 and the sealing portion 110 is formed on the metal end 100, an extending portion 121 is formed on a sidewall of the mounting hole 122, the extending portion 121 protrudes out of a bottom of the sealing portion 110, and a step 123 is formed on an outer side surface of the extending portion 121.

Wherein the mouthpiece valve 600 may be fixedly mounted into the mounting hole 122. The extension 121 is used for the sleeved installation of the sealing gasket 300 and the fixed connection with the locking structure 400, and the locking structure 400 can press the sealing gasket 300 on the step 123 of the outer side surface of the extension 121 and the plastic shell 200 abutting on the step 123.

As shown in fig. 7 in particular, the present embodiment includes a gasket 300 having an outer diameter larger than that of the step 123, and a portion of the gasket 300 is pressed against the step 123. That is, a part of the gasket 300 is pressed against the bottom surface of the step 123, and the side surface of the step 123 abuts against the plastic housing 200, at this time, the remaining part of the gasket 300 may be pressed against the plastic housing 200, so that a potential gap at the position where the plastic housing 200 abuts against the side surface of the step 123 may be blocked, and the sealing property may be further ensured.

The material of the gasket 300 may be FKM, EPDM, FVMQ, PTFE, silicone, or the like, and in order to enhance the hydrogen gas corrosion resistance and the low temperature resistance, the material of the gasket 300 in this embodiment is preferably FKM, EPDM, or PTFE.

Further, as shown in fig. 6 and 7, the locking structure 400 of the present embodiment includes a fixing hole and a pressing groove, the pressing groove is engaged with the gasket 300, and the fixing hole is fixedly connected with the extending portion 121. The inner diameter of the pressing groove is larger than that of the fixing hole, so that a blocking surface is formed between the pressing groove and the fixing hole, the sealing gasket 300 can be abutted against the blocking surface after being installed in the pressing groove, and the sealing gasket 300 is tightly pressed through the fixed connection of the locking structure 400 and the extension part 121. Wherein, in order to facilitate the connection of the locking structure 400 and the extension 121, the fixing hole and the extension 121 may be screwed.

Further, as shown in fig. 8 and 9, the metal end 100 is provided with a mounting hole 122 penetrating through the connecting portion 120 and the sealing portion 110, the mounting hole 122 includes a mounting section 125 and a connecting section 124, and an inner diameter of the mounting section 125 is smaller than an inner diameter of the connecting section 124.

It can be understood that, a step 123 structure is formed between the connecting section 124 and the mounting section 125, when the metal end 100 and the plastic shell 200 are molded by injection or rotational molding, the raw material of the plastic shell 200 can be filled to the step 123 structure, so that the surface of the molded raw material is flush with the inner surface of the mounting section 125, and meanwhile, the raw material can be fastened on the inner surface of the connecting section 124 and integrally molded with the plastic shell 200 wrapped at the bottom of the metal end 100, so that the outer side, the bottom and the inner side of the sealing part 110 of the metal end 100 connected with the plastic shell 200 can be tightly wrapped, thereby effectively preventing the leakage of high-pressure gas in the container and ensuring the sealing effect.

The first hole channels 111 can penetrate through the connecting section 124, so that raw materials in each first hole channel 111 and the plastic shell 200 at the step 123 structure are integrally formed, the integral strength of the structure is enhanced, the connection tightness between the metal end 100 and the plastic shell 200 is ensured, and a gap between the metal end 100 and the plastic shell 200 after long-term use is avoided.

Further, as shown in fig. 3 and 4, the first hole 111 may be provided in a plurality of pieces, and the plurality of first holes 111 are uniformly distributed in the radial direction and the circumferential direction of the sealing portion 110; in this embodiment, four first hole passages 111 may be provided in the radial direction of the seal portion 110, and six groups are uniformly provided in the circumferential direction of the seal portion 110 with the four first hole passages 111 as a group.

In addition, the second hole 112 is annular, and the annular second hole 112 extends from the bottom of the sealing portion 110 to the inside along the circumferential direction thereof, so as to be cross-communicated with the first hole 111, so that the raw materials injected into the holes can be integrally molded, the raw materials in the holes can be tightly connected with the metal tip 100, and the connection reliability between the metal tip 100 and the plastic housing 200 is ensured.

The invention also provides a high-pressure composite container, which comprises the bottle mouth sealing structure provided by any embodiment of the invention, and further comprises a plastic shell 200, a bottle mouth valve 600 and a fiber winding reinforcing layer 500; the plastic shell 200 is fixedly connected with the metal end 100 after raw materials are filled into the first pore channel 111 and the second pore channel 112 by adopting an injection molding or rotational molding process; the bottleneck valve 600 is fixedly arranged in the mounting hole 122 on the metal end 100; the filament wound reinforcing layer 500 is fixedly wound on the plastic shell 200 and the metal tip 100.

As shown in fig. 6 and 9, after the metal terminal 100 and the plastic case 200 are fixed, the fiber-wound reinforcing layer 500 is fixedly wound around the outer surfaces of the plastic case 200 and the metal terminal 100 to bear the pressure resistance of the high pressure composite container.

It should be noted that, in an embodiment, when the step 123 structure is formed between the connecting section 124 and the mounting section 125 in the mounting hole 122, as shown in fig. 9, the container further includes a sealing ring 700 for sealing engagement with the mouthpiece valve 600, and the sealing ring 700 is connected to the plastic housing 200 filled on the inner wall of the mounting hole 122.

Specifically, when the mouthpiece valve 600 is mounted into the mounting hole 122, the mouthpiece valve 600 may be screwed with the metal tip 100, and at the same time, the mouthpiece valve 600 may extend to the plastic housing 200 in the mounting hole 122 to be engaged with the sealing ring 700 at the plastic housing 200, thereby ensuring the sealing effect of the mouthpiece valve 600 and the mouthpiece sealing structure without the sealing gasket 300 and the locking structure 400 in the above embodiments, and simplifying the structural design.

According to the bottle mouth sealing structure and the high-pressure composite container provided by the embodiment of the invention, the metal end head with the first pore channel and the second pore channel which are mutually intersected is arranged, so that the plastic shell parts in the first pore channel and the second pore channel can form an integral structure, and a net-shaped structure is formed in the metal end head, so that fastening force can be provided at each part in the metal end head, the metal end head and the plastic shell can be in close contact, the sealing performance of the connection between the metal end head and the plastic shell is ensured, and the looseness of the fit between the metal end head and the plastic shell after long-term use is prevented.

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

1. A finish seal structure, comprising:

the metal end is provided with a first pore channel and a second pore channel, the first pore channel is communicated with the second pore channel, the extending directions of the first pore channel and the second pore channel are intersected, and the first pore channel horizontally extends outwards along the radial direction of the container on the metal end and extends out of the surface of the metal end.

2. The finish sealing structure of claim 1, wherein the metal end comprises a connecting portion and a sealing portion, the connecting portion protrudes from the sealing portion, the first duct and the second duct are both disposed on the sealing portion, and the first duct and the second duct are vertically communicated.

3. The bottle mouth sealing structure according to claim 2, wherein a mounting hole penetrating through the connecting portion and the sealing portion is formed in the metal end, an extending portion is formed in a side wall of the mounting hole, the extending portion protrudes out of the bottom of the sealing portion, and a step is formed in an outer side surface of the extending portion.

4. The bottleneck sealing structure of claim 3, further comprising a gasket, wherein said gasket is sleeved on said extension portion, the outer diameter of said gasket is larger than the outer diameter of said step, and a portion of said gasket is compressed on said step.

5. The bottleneck sealing structure of claim 4, further comprising a locking structure, wherein the locking structure is provided with a fixing hole and a pressing groove, the pressing groove is matched with the sealing gasket, and the fixing hole is fixedly connected with the extending part.

6. The bottleneck sealing structure of claim 2, wherein the metal end is provided with a mounting hole penetrating through the connecting portion and the sealing portion, the mounting hole comprises a mounting section and a connecting section, and the inner diameter of the mounting section is smaller than that of the connecting section.

7. The finish seal structure of claim 6, wherein the first bore extends through the connecting section.

8. The bottleneck sealing structure according to any one of claims 2 to 7, wherein a plurality of the first portholes are provided, and the plurality of the first portholes are uniformly distributed in a radial direction and a circumferential direction of the sealing portion;

the second hole channel is annular.

9. A high pressure composite container comprising the finish seal structure of any one of claims 1 to 8, said high pressure composite container further comprising a plastic shell, a finish valve and a fiber wound reinforcement layer;

10. The high pressure composite container according to claim 9, further comprising a sealing ring for sealing engagement with the finish valve, the sealing ring being coupled to the plastic shell filled on the inner wall of the mounting hole.