CN108131554B

CN108131554B - Sealing device for plastic liner of high-pressure composite container

Info

Publication number: CN108131554B
Application number: CN201810021202.2A
Authority: CN
Inventors: 姜林; 刘亮; 翁益明; 周传军
Original assignee: Yapp Automotive Parts Co Ltd
Current assignee: Yapp Automotive Parts Co Ltd
Priority date: 2017-12-31
Filing date: 2018-01-10
Publication date: 2023-06-30
Anticipated expiration: 2038-01-10
Also published as: CN108131554A; CN208546740U

Abstract

The invention relates to a sealing device of a plastic liner of a high-pressure composite container, which comprises a metal end of aluminum alloy or stainless steel, a plastic liner of single-layer or multi-layer material, a composite layer formed by fiber and resin, an elastomer rubber sealing ring, a bottleneck valve and a metal sealing liner, wherein the metal end is wrapped by the plastic liner and is connected with the plastic liner in a reinforcing way through a reinforcing part, and the two sealing rings are respectively arranged on the metal end and the plastic liner; the sealing gasket, the metal end and the plastic lining extrude the sealing ring, the composite layer wraps the sealing gasket and the plastic lining in a winding mode, and the bottleneck valve is connected with the metal end through metal threads, so that a sealing structure is finally formed. In order to ensure that the connection between the metal end and the plastic lining is more reliable, the metal end is embedded in the plastic lining during molding, and the metal end and the plastic lining are reliably connected through the characteristics of holes, grooves, corrugations and the like on the metal end.

Description

Sealing device for plastic liner of high-pressure composite container

Technical Field

The invention relates to a sealing device, in particular to a sealing device for a plastic liner of a high-pressure composite container, and belongs to the technical field of oil tank structural components.

Background

Most taxis are refitted with Compressed Natural Gas (CNG) to replace fuel oil, and the working pressure of a common CNG high-pressure gas cylinder is 20MPa; some vehicle manufacturers have promoted CNG or vehicles in which CNG is mixed with fuel, such as audi, general, etc. The hydrogen fuel cell automobile is also a current hot spot, the working pressure of a hydrogen storage high-pressure gas cylinder is generally 35MPa and 70MPa, and an IV type bottle (high-pressure plastic lining composite container) with the pressure of 70MPa is a current research and development hot spot. In addition to vehicles, high-pressure gas cylinders are also used in other fields, for example, some liquefied petroleum gases in europe use plastic lined composite containers (operating pressure 2 MPa). 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 large weight and is not easy to transport; and the higher the storage pressure is, the more complex the production process of the metal liner is, the higher the cost is, and the risk of corrosion by high-pressure gas exists. In order to meet the requirement of light weight, high-pressure plastic lining composite containers are produced, and the products have the advantages of corrosion resistance, fatigue resistance and the like because of the characteristics of plastics, and mainly manufacturers are Toyota, hexagon (Norway), quantum (U.S.), and the like. Compared with a pure metal or metal lining composite container, the high-pressure plastic lining composite container has more severe guarantee on tightness, and the main reason is that the plastic lining and the metal end are made of different materials, so that the plastic lining and the metal end are connected loose in the repeated use process, and the sealing performance is reduced.

In view of the current situation, the connection of the metal tip and the plastic liner becomes a hot spot and a difficult point of research. Fig. 1 shows a high pressure plastic liner composite vessel, with a metal tip 1 mounted on a plastic liner 2, and then wrapped around by a composite layer 3. Fig. 2 illustrates a sealing structure of an end face: the large surface contact of the metal tip 1 with the plastic liner is not technically feasible, and even viable costs are high; the limit on the axes of the metal end 1 and the plastic liner 2 is not considered in the structure; the structure does not consider the pressurization of the continuous change of the internal pressure of the plastic lining during winding, which can lead to the generation of gaps at the joint of the metal end head 1 and the plastic lining to cause leakage; the structure does not consider the limitation of the bottleneck when bearing the installation torque, and the bonding strength of the metal end 1 and the composite layer 3 is reduced after the installation; the escape path P of the compressed gas in the structure is shorter, so that the risk of escaping the compressed gas, especially small molecular gas hydrogen and helium, can be increased; therefore, a new solution is urgently needed to solve the technical problem.

Disclosure of Invention

The invention provides a sealing device for a plastic liner of a high-pressure composite container, which aims at the technical problems in the prior art, has ingenious design and compact structure, is used for ensuring that a metal end is connected with a plastic liner more reliably, is embedded into the metal end when the plastic liner is formed, ensures that the metal end and the plastic liner are reliably connected through the characteristics of holes, grooves, waves and the like on the metal end, and simultaneously has a wave structure capable of inhibiting the escape of compressed gas to a certain extent; in order to reduce the escape of compressed gas, a hydrogen escape path P is increased; the connection of the metal end, the plastic lining and the bottleneck valve is comprehensively considered, and the assembly is sealed by using a few sealing rings.

In order to achieve the above purpose, the technical scheme of the invention is that the sealing device of the plastic liner of the high-pressure composite container comprises a metal end of aluminum alloy or stainless steel, a plastic liner of single-layer or multi-layer material, a composite layer formed by fiber and resin, an elastomer rubber sealing ring, a bottleneck valve and a metal sealing liner, wherein the metal end is wrapped by the plastic liner and is connected with the plastic liner in a reinforcing way through a reinforcing part, and the two sealing rings are respectively arranged on the metal end and the plastic liner; the sealing gasket, the metal end and the plastic lining extrude the installed sealing ring, the composite layer wraps the sealing gasket and the plastic lining in a winding mode, and the bottleneck valve is connected with the metal end through metal threads, so that a sealing structure is finally formed.

As an improvement of the invention, the reinforcing component is one or more of holes, grooves, a corrugated structure and a special-shaped structure arranged on the metal end.

As an improvement of the invention, the metal end head comprises a straight end head, namely a bottle mouth position, and an arc end head, namely a sealing head position, wherein the thickness of the arc end head gradually becomes thinner from inside to outside, the hole and the groove are arranged at the arc end head, and the corrugated structure is arranged at the straight end head.

As an improvement of the invention, the holes are distributed at the outermost side of the end of the arc-shaped section, the wall thickness is thinner, and the axial direction of the holes is perpendicular to the joint surface as much as possible. In the forming process, molten plastic is extruded through the holes to a minimum section and forms a back-off structure, so that enough material can be extruded; and forming a back-off structure. Considering the equal diameter openings at the same time, the following conditions are satisfied for the areas of the opening 11a and the

minimum cross sections

11b, 11c of the cross section (the normal direction of the cross section is parallel to the normal direction of the bonding surface) that initially contact the preform.

Min (the sectional area of 11a, the sectional area of 11 c) is not less than the sectional area of 11b;

the pore structure is not limited to the structure in the schematic diagram, but is limited to all cases where the above formula may occur.

As an improvement of the invention, the grooves are distributed at the thicker position of the arc-shaped section end head, the grooves are arranged into a small inlet and large internal structure, and in the forming process, molten plastics pass through the grooves to form inverted buckles. In the scheme, in order to ensure that the material can be extruded into the groove to form the back-off, the inlet is small, the inside is large, and the main feeding direction is parallel to the normal direction of the joint surface as much as possible; to ensure venting, through holes are designed.

As an improvement of the invention, the corrugated structure is distributed at the end of the straight section, namely the position of the bottle mouth, in the molding process, the plastic lining forms annular limit seal corrugations after blow molding, the sections of each corrugation are connected end to end after rotating 360 degrees, and the corrugations connected end to end are arrayed along the axial position of the bottle mouth. In order to enhance the connection strength between the metal end at the bottle mouth and the plastic lining, the leakage path of compressed gas is increased, and the plastic lining is characterized in that the metal end adopts a corrugated structure after blow molding. The single corrugated section structure is not limited to a rectangle or an isosceles trapezoid, but is limited to end-to-end connection after each section rotates 360 degrees, and the corrugations connected end-to-end are arrayed along the axial position of the bottle mouth.

As an improvement of the invention, the special-shaped structure is distributed at the end of the straight section, namely the bottle mouth position. To ensure that the bottle mouth position can bear large torque. The metal end is provided with a profiled geometry 14a which prevents radial rotation, and other features, such as pre-installation grooves, may be provided on top of the profiled geometry in order to ensure the installation of the seal ring.

The utility model provides a sealing device of high pressure composite container plastic inner bag, seal structure comprises aluminum alloy or stainless steel's metal end, the plastic lining of individual layer or multilayer material, the composite bed that fibre and resin constitute, elastomer rubber seal and bottleneck valve, the metal end is wrapped up by the plastic lining to strengthen through the reinforcing part and connect, and strengthen through hole, groove, ripple etc. and connect, the composite bed wraps up the plastic lining through winding mode, on sealing washer preinstallation and the plastic lining, metal end, the sealing washer that the extrusion of plastic lining had been installed, bottleneck valve and metal end pass through the metal screw thread and are connected, form sealedly. The scheme adopts external thread connection, and sealing occurs on the plastic lining and the metal end, so that 1 sealing ring can be saved, and meanwhile, a sealing gasket is omitted.

The utility model provides a sealing device of high-pressure composite container plastic inner bag, seal structure comprises aluminum alloy or stainless steel's metal end, the plastic lining that has sealing characteristic, the composite bed that fibre and resin constitute, elastomer rubber seal and bottleneck valve, the metal end is strengthened by the plastic lining and is connected through reinforcing part, the composite bed wraps up the plastic lining through winding mode, on sealing washer preinstallation and the plastic lining, metal end, the sealing washer that the extrusion of plastic lining had been installed, bottleneck valve and metal end pass through the metal screw thread and are connected, form sealedly.

As an improvement of the invention, the reinforcing component is one or more of a hole, a groove, a corrugated structure, a clamping groove and a slotted hole structure which are arranged on the metal end, the clamping groove is circumferentially arranged at the bottle mouth position, and the clamping groove is connected with the plastic lining in a material extrusion mode during blow molding; the slotted hole structure is circumferentially arranged at the bottle mouth position, and the slotted hole structure enters in a material extrusion mode during blow molding. According to the scheme, another connecting structure is adopted at the bottle opening position, the torque bearing capacity is guaranteed through the clamping groove, and the metal end is connected with the plastic lining through the slotted hole structure to guarantee sealing. The clamping grooves of the scheme are arranged in a circumferential direction. During blow molding, the clamping groove is connected with the plastic lining in a material extrusion mode, and clamping groove features can be formed on the metal end under the possible condition, so that the bottle mouth positions are connected more reliably. The slot hole structure in this scheme, this structure is the hoop and arranges. During blow molding, the slot structure is made to enter along the extrusion direction of the broken line by extrusion. The structure forms radial limiting connection, improves the connection strength and enhances the sealing.

Compared with the prior art, the invention has the advantages that 1) the technical scheme has compact and ingenious overall structural design, the scheme comprehensively considers the connection of the metal end, the plastic liner and the bottleneck valve, the scheme designs the metal end with holes and grooves, and when the plastic liner is formed, the connection of the plastic liner and the metal end surface is realized, and the escape path of compressed gas is prolonged; 2) The scheme adopts a plurality of closed wavy lines which are connected end to end, so that the connection strength of the bottle mouth is enhanced, and compressed gas escape is inhibited; 3) The special-shaped structure, holes and grooves are added at the position of the bottle mouth, so that the connection strength and sealing between the plastic lining and the metal end are enhanced; 4) According to the scheme, the assembly of the bottleneck valve is comprehensively considered, the sealing of the whole system is realized, the use of the sealing ring is reduced, the cost is reduced, and the reliability of the system is improved.

Drawings

FIG. 1 is a schematic diagram of a prior art compression vessel;

FIG. 2 is a schematic diagram of a prior art seal structure;

FIG. 3 is a schematic structural view of embodiment 1;

FIG. 4 is a schematic view of a metal header structure;

FIG. 5 is a schematic view of the structure of the hole;

FIG. 6 is a schematic diagram of a slot configuration;

FIG. 7 is a schematic diagram of a corrugated structure;

FIG. 8 is a schematic view of a bottle mouth special-shaped structure;

FIG. 9 is a schematic structural view of embodiment 2;

FIG. 10 is a schematic structural view of embodiment 3;

FIG. 11 is a schematic diagram of a card slot structure;

FIG. 12 is a schematic view of a slot structure.

In the figure: 1. metal end, 2, plastic liner, 3, composite layer, 4, sealing ring, 5, bottleneck valve, 6, sealing gasket, 10, sealing structure, 11, hole, 12, groove, 12a, inlet, 12b, through hole, 13, corrugated structure, 14, special-shaped structure, 15, flange, 15a, sealing ring mounting groove, 16, clamping groove, 16a, clamping groove profile, 16b, clamping groove profile, 17, slotted hole structure, 21, back-off structure, 22, back-off, 23, annular limiting sealing corrugation 26 buckle, 27 buckle, 28 sealing ring mounting groove.

The specific embodiment is as follows:

in order to enhance the understanding of the present invention, the present embodiment will be described in detail with reference to the accompanying drawings.

Example 1: referring to fig. 3, a sealing device of a plastic liner of a high-pressure composite container is composed of a metal end 1 of aluminum alloy or stainless steel, a plastic liner 2 of single-layer or multi-layer material, a composite layer 3 composed of fiber and resin, an elastomer rubber sealing ring 4, a bottleneck valve 5 and a metal sealing liner 6, wherein the metal end 1 is wrapped by the plastic liner 2 and is connected with the plastic liner by reinforcement parts in a reinforcing way, and the 2 sealing rings 4 are respectively arranged on the metal end 1 and the plastic liner 2; the sealing gasket 6, the metal end 1 and the plastic liner 2 extrude the installed sealing ring 4, the composite layer 3 wraps the sealing gasket 6 and the plastic liner 2 in a winding mode, the bottleneck valve 5 and the metal end 1 are connected through metal threads, and finally a sealing structure is formed, and the reinforcing component is one or more of a hole 11, a groove 12, a corrugated structure 13 and a special-shaped structure 14 arranged on the metal end. The compressed gas leakage path P is most likely to occur along the interface of the metal tip 1 and the plastic liner 2. The design shown in fig. 1 greatly increases the path for the gas to escape. The structure adopts 2 sealing rings, the upper sealing ring 4 prevents gas from flowing out from the gap between the sealing gasket 6 and the metal end, and the lower sealing ring prevents gas from flowing out from the gap between the sealing gasket 6 and the metal end 1 through the composite layer.

The distribution of 4 basic features is introduced to the metal tip 1 as shown in fig. 4, with all features being distributed circumferentially as a whole; the hole grooves are distributed at the positions (arc sections) of the seal head, and the opening direction is consistent with the normal direction of the joint surface as much as possible; the ripple feature and the special-shaped geometric feature are distributed at the position of the bottle mouth.

Further, as shown in fig. 5, the metal end includes a flat end, i.e. a bottle mouth position, and an arc end, i.e. a sealing head position, where the thickness of the arc end gradually becomes thinner from inside to outside, the hole 11 and the groove 12 are arranged at the arc end, the corrugated structure 13 and the special-shaped structure 14 are arranged at the flat end, the hole 11 is distributed at the outermost side of the arc end, the wall thickness is thinner, and the axial direction of the hole is perpendicular to the bonding surface as much as possible. During the forming process, the molten plastic is extruded through the holes 11 to a minimum section 11b and forms a back-off structure 21, in order to satisfy that enough material can be extruded to 11b; and the back-off structure 21 is formed. Considering the equal diameter openings at the same time, the following conditions are satisfied for the areas of the cross sections (normal to the cross section is parallel to the normal to the bonding surface) 11a (opening that initially contacts the preform), 11b (minimum cross section), 11 c.

Further, as shown in FIG. 6, the slots 12 are distributed at a thicker end of the arcuate segment, the slots being configured with a smaller inlet and a larger interior, and the molten plastic passing through the slots 12 during the molding process forms a undercut 22. In the scheme, in order to ensure that the material can be extruded into the groove 12 to form the back-off 22, the inlet 12a is small and the inside is large, and the main feeding direction is parallel to the normal direction of the joint surface as much as possible; to ensure the exhaust, the through hole 12b is designed.

Further, as shown in fig. 7, the corrugated structure is distributed at the end of the straight section, namely at the position of the bottle mouth, in the molding process, the plastic liner 2 forms annular limit seal corrugations 23,23' after blow molding, each corrugated section rotates for 360 degrees and then is connected end to end, and the corrugations connected end to end are arrayed along the axial position of the bottle mouth. To increase the strength of the connection of the metal tip 1 to the plastic liner 2 at the finish, the leakage path for the compressed gas is increased, the metal tip 1 is corrugated 13,13 'to form features 23,23' in the plastic liner 2 after blow molding. The single corrugated section structure is not limited to a rectangle (13 a length is equal to 13b length) and an isosceles trapezoid (13 a 'length is greater than 13b' length), but is limited to an end-to-end connection after each section rotates 360 degrees, and the corrugations connected end-to-end are arrayed along the axial position of the bottle mouth.

Further, as shown in fig. 8, the special-shaped structures 14 are distributed at the ends of the straight sections, namely at the positions of the bottle mouth, so as to ensure that the positions of the bottle mouth can bear large torque. The metal tip 1 is provided with a profiled geometric feature 14a which prevents radial rotation, this feature not being limited to the schematic illustration shown in the figures. In order to ensure the mounting of the sealing ring, other features may be present on the special-shaped geometric features, such as the sealing ring mounting groove 15a, which allows for the assembly of the finish valve, and the sealing ring is arranged on the whole, so that the amount of the sealing ring can be reduced. When the plastic lining is formed, the plastic lining is connected with the metal lining, and the plastic is extruded into the metal end through the structures such as holes, grooves, corrugations and the like, so that the connection strength is improved, the working procedures are reduced, the requirements on the structure, the size, the performance, the process and the like of the high-pressure container are reduced, and the development and manufacturing cost is reduced. The escape path of the compressed gas is structurally increased, and the escape path is sealed by the sealing ring, so that the emission is effectively reduced, and the safety performance of the product is improved.

Example 2: referring to fig. 9, a sealing device for a plastic liner of a high-pressure composite container, the sealing structure is composed of a metal end 1 of aluminum alloy or stainless steel, a plastic liner 2 of single-layer or multi-layer material, a composite layer 3 composed of fiber and resin, an elastomer rubber sealing ring 4 and a bottleneck valve 5, the metal end 1 is wrapped by the plastic liner 2 and is connected with the plastic liner through reinforcement parts in a reinforcing way, the composite layer 3 wraps the plastic liner 2 in a winding way, the sealing ring 4 is pre-installed on the plastic liner 2, the metal end 1 and the plastic liner 2 squeeze the installed sealing ring 4, and the bottleneck valve 5 and the metal end 1 are connected through metal threads to form a seal. In the sealing structure 10 shown in fig. 9, compared with the embodiment 1, the scheme adopts external screw connection, and sealing is performed on the plastic lining and the metal end, so that 1 sealing ring 4 can be saved, and meanwhile, the sealing gasket 6 is omitted. The reinforcing member described in this embodiment is provided as one or more of a hole, a groove, a corrugation, and the like, wherein the same as in embodiment 1 is described with respect to the characteristics of the hole, the groove, the corrugation.

Example 3: referring to fig. 10, a sealing device of a plastic liner of a high-pressure composite container is provided, wherein the sealing structure is composed of a metal end 1 of aluminum alloy or stainless steel, a plastic liner 2 with sealing characteristics, a composite layer 3 composed of fiber and resin, an elastomer rubber sealing ring 4 and a bottleneck valve 5, and the metal end 1 is connected by the plastic liner 2 in a reinforcing way through a reinforcing part; the composite layer 3 wraps the plastic liner 2 in a winding way, the sealing ring 4 is pre-installed on the plastic liner 2, the metal end head 1 and the plastic liner 2 squeeze the installed sealing ring 4, the bottleneck valve 5 and the metal end head 1 are connected through metal threads to form a seal, the reinforcing component is one or more of a hole, a groove, a corrugated structure, a clamping groove and a slotted hole structure arranged on the metal end head, the clamping groove 16 is circumferentially arranged at the bottleneck position, and the clamping groove 16 is connected with the plastic liner 2 in a material extruding way during blow molding; the slot structure is circumferentially arranged at the bottle mouth position, and the slot structure 17 enters along the dotted line direction 17a in a material extrusion mode during blow molding. In the sealing structure shown in fig. 10, compared with the embodiment 1 and the embodiment 2, another connecting structure is adopted at the bottle opening position, the torque bearing capacity is ensured through the clamping groove 16, and the connection between the metal end 1 and the plastic lining 2 is realized through the slot hole structure 17 to ensure sealing. The clamping grooves 16 shown in fig. 11 are arranged circumferentially. During blow molding, the clamping groove 16 is connected to the plastic lining 2 by means of extrusion, and if possible, the

features

16a, 16b can be formed on the metal end 1, so that the connection of the mouth position is more reliable. As shown in fig. 12, the slot structure is arranged in a circumferential direction, and the slot structure 17 is introduced in the direction of a broken line 17a by extrusion during blow molding. The structure forms radial limiting connection, improves the connection strength and enhances the sealing.

The reinforcing member described in this embodiment is provided as one or more of a hole, a groove, a corrugation, and the like, wherein the same as in embodiment 1 is described with respect to the characteristics of the hole, the groove, the corrugation.

In the scheme, when the plastic lining is in blow molding, the metal end is placed on a mould or other supporting pieces, and when the mould is closed, the metal end is wrapped by molten plastic, and part of molten plastic is extruded into holes, grooves and the like of the end, so that connection is realized. In order to ensure the uniformity of stress, the holes and the grooves are symmetrically distributed in the circumferential direction. In the whole arrangement, the holes are close to the edges, and the grooves are arranged at the places where the thickness of the metal end is relatively large.

The wells had 2 types: a joint surface (hereinafter, simply called joint surface) of the metal end and the lining is used as a reference, and the opening direction is parallel to the normal direction of the joint surface as much as possible, so that the extrusion of materials is facilitated; the diameter of the hole is changed from large to small, and the hole is changed into large after a certain thickness is reached, so that the inverted structure can be formed; another type of constant diameter through hole is typically used where the former type of location is not available, such as an edge weakness or vent.

The characteristics of the groove are as follows: the bonding surface is used as a reference, the normal direction of the slot opening is parallel to the normal direction of the bonding surface as much as possible, the opening size is smaller than the size of the hollowed-out area inside, and the inverted buckle structure is formed by the molten plastic; to ensure the compactness of the plastic filling in the tank, small holes can be made in the tank for venting.

The connecting wavy lines (generally at the bottleneck position) are arranged between the metal end and the plastic lining, and the staggered structure of the canine teeth is beneficial to the strength of the joint surface, so that the path of compressed gas leakage is effectively increased. The cross section of the single corrugation can be rectangular, trapezoidal, triangular, etc. The axial position array of the bottle mouth is arranged between the wavy lines, and the distance considers the processing difficulty of the metal end and the plastic extrusion molding process. And a sealing ring is arranged on a leakage path of the compressed gas to block the gas leaked from the lining, eliminate gaps caused by dimensional tolerance and design different schemes for different connections.

In the practical application process, not all measures are necessarily required to be applied because of different storage media and pressures.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.

Claims

1. The sealing device of the plastic liner of the high-pressure composite container is characterized by comprising a metal end of aluminum alloy or stainless steel, a plastic liner of single-layer or multi-layer material, a composite layer formed by fibers and resin, an elastomer rubber sealing ring, a bottleneck valve and a metal sealing liner, wherein the metal end is wrapped by the plastic liner and is connected with the plastic liner in a reinforcing way through a reinforcing part, and the two sealing rings are respectively arranged on the metal end and the plastic liner; the sealing gasket, the metal end and the plastic liner extrude the sealing ring, the composite layer wraps the sealing gasket and the plastic liner in a winding mode, the bottleneck valve is connected with the metal end through metal threads, and finally a sealing structure is formed, and the reinforcing component is a hole, a groove, a corrugated structure and a special-shaped structure which are arranged on the metal end; the metal end head comprises a straight section and an arc section, the thickness of the arc section of the metal end head is gradually thinned from inside to outside, the hole and the groove are formed in the end head of the arc section, and the corrugated structure is formed in the end head of the straight section;

the holes (11) are distributed at the outermost side of the end of the arc-shaped section, the wall thickness is thinner, and in the forming process, molten plastic is extruded to the smallest section (11 b) through the holes (11) and forms a back-off structure (21);

the grooves (12) are distributed at the thicker position of the end of the arc-shaped section, the grooves are arranged into small inlets and large internal structures, and in the forming process, molten plastics form inverted buckles (22) through the grooves (12);

the corrugated structure is distributed at the end of the straight section, namely at the bottle mouth position, and in the forming process, the plastic lining (2) forms annular limit seal corrugations (23, 23') after blow molding;

the special-shaped structures (14) are distributed at the ends of the straight sections, namely the positions of the bottle mouths.

2. The sealing device of the plastic liner of the high-pressure composite container is characterized by comprising a metal end of aluminum alloy or stainless steel, a plastic liner of single-layer or multi-layer material, a composite layer formed by fibers and resin, an elastomer rubber sealing ring and a bottleneck valve, wherein the metal end is wrapped by the plastic liner and is reinforced and connected by a reinforcing part, the composite layer wraps the plastic liner in a winding way, the sealing ring is pre-installed on the plastic liner, the metal end and the plastic liner extrude the sealing ring, the bottleneck valve and the metal end are connected by metal threads to form a seal, and the reinforcing part is a hole, a groove, a corrugated structure and a special-shaped structure which are arranged on the metal end;

the metal end head comprises a straight section and an arc section, the thickness of the arc section of the metal end head is gradually thinned from inside to outside, the hole and the groove are formed in the end head of the arc section, and the corrugated structure is formed in the end head of the straight section;

3. The sealing device of the plastic liner of the high-pressure composite container is characterized by comprising a metal end of aluminum alloy or stainless steel, a plastic liner with sealing property, a composite layer formed by fibers and resin, an elastomer rubber sealing ring and a bottleneck valve, wherein the metal end is connected with the plastic liner in a reinforcing way through a reinforcing part, the composite layer wraps the plastic liner in a winding way, the sealing ring is pre-installed on the plastic liner, the metal end and the plastic liner squeeze the sealing ring, the bottleneck valve is connected with the metal end through metal threads to form a seal, and the reinforcing part is a hole, a groove, a corrugated structure and a special-shaped structure which are arranged on the metal end; the metal end head comprises a straight section and an arc section, the thickness of the arc section of the metal end head is gradually thinned from inside to outside, the hole and the groove are formed in the end head of the arc section, and the corrugated structure is formed in the end head of the straight section;