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CN108119748B - High-pressure composite container with sealing structure - Google Patents

High-pressure composite container with sealing structure Download PDF

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Publication number
CN108119748B
CN108119748B CN201711494394.0A CN201711494394A CN108119748B CN 108119748 B CN108119748 B CN 108119748B CN 201711494394 A CN201711494394 A CN 201711494394A CN 108119748 B CN108119748 B CN 108119748B
Authority
CN
China
Prior art keywords
neck part
inner container
container
sealing
plastic inner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711494394.0A
Other languages
Chinese (zh)
Other versions
CN108119748A (en
Inventor
姜林
刘亮
翁益明
孙超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yapp Automotive Parts Co Ltd
Original Assignee
Yapp Automotive Parts Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yapp Automotive Parts Co Ltd filed Critical Yapp Automotive Parts Co Ltd
Priority to CN201711494394.0A priority Critical patent/CN108119748B/en
Publication of CN108119748A publication Critical patent/CN108119748A/en
Application granted granted Critical
Publication of CN108119748B publication Critical patent/CN108119748B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/04—Protecting sheathings
    • F17C1/06—Protecting sheathings built-up from wound-on bands or filamentary material, e.g. wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/06—Closures, e.g. cap, breakable member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/066—Plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/0663—Synthetics in form of fibers or filaments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0305—Bosses, e.g. boss collars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0382—Constructional details of valves, regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2109—Moulding
    • F17C2209/2127—Moulding by blowing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/228—Assembling processes by screws, bolts or rivets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention relates to a high-pressure composite container with a sealing structure, which comprises a plastic inner container, wherein the plastic inner container is provided with a neck part connected with the plastic inner container, and a supporting cover at least partially surrounding the plastic inner container and the neck part, the neck part is arranged in an opening area of the neck part of the container, and at least one sealing ring is arranged between the neck part and the plastic inner container; the inner wall or the outer wall of the cavity of the inner container near the container port is tightly attached to the neck part, gas molecules are prevented from leaking on the path of the matching surface of the inner container and the neck part in a sealing gasket mode, the plastic inner container is obtained by extrusion blow molding, the plastic inner container is surrounded by a fiber supporting cover formed by reinforced fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin; the technical scheme can realize efficient sealing in a simpler structural form.

Description

High-pressure composite container with sealing structure
Technical Field
The invention relates to a composite container, in particular to a high-pressure composite container with a sealing structure, and belongs to the technical field of oil tank structural parts.
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 the hydrogen storage high-pressure gas cylinder is generally 35MPa and 70MPa, and an IV type bottle (high-pressure plastic liner composite container) with 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 liner composite containers (working 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 light weight requirement, the high pressure plastic liner composite container is produced, and the product has the advantages of corrosion resistance, fatigue resistance and the like because of the characteristics of plastics, and the main 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 liner composite container has more severe guarantee on tightness, and the main reason is that the plastic liner and the metal end are made of different materials, so that the connection between the plastic liner and the metal end can be loosened in the repeated use process, and the sealing performance is reduced.
In view of the current situation, the connection of the metal end and the plastic liner becomes a hot spot and a difficult point of research. Fig. 8 shows a high-pressure plastic liner composite container, in which a metal end 1 is mounted on a plastic liner 2, and then is formed by winding and wrapping a fiber composite material layer 3. Fig. 9 illustrates a sealing structure of an end face: the large-surface contact of the metal end 1 with the plastic liner is not feasible in technology, and even if the process is feasible, the cost is 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 liner during winding, which can lead to the generation of gaps at the joint of the metal end 1 and the plastic liner 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 aims at the technical problems in the prior art, and provides the high-pressure composite container with the sealing structure.
In order to achieve the above object, the present invention provides a high-pressure composite container provided with a sealing structure, characterized in that the container comprises a plastic liner having a neck part connected to the plastic liner, and a support cover at least partially surrounding the plastic liner and the neck part, the neck part being provided in an opening area of a neck of the container, and at least one sealing ring being provided between the neck part and the plastic liner; the inner wall or the outer wall of the cavity of the inner container near the container port is tightly attached to the neck part, gas molecules are prevented from leaking on the path of the matching surface of the inner container and the neck part by adopting a sealing gasket mode, the plastic inner container is obtained by extrusion blow molding, the plastic inner container is surrounded by a fiber supporting cover formed by reinforced fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin. For the plastic liner, thermoplastic plastics such as nylon, HDPE, polyester, PP, POM and the like which are commonly used in the current commerce are considered, meanwhile, the plastic liner can adopt a multi-layer structure, and a barrier layer is added in the middle of the plastic liner to prevent permeation of small molecules such as hydrogen molecules and the like.
As an improvement of the invention, the neck part is assembled from the outside after the plastic inner container is blow-molded, an annular sealing gasket with an L-shaped section is arranged between the neck part and the matching surface of the plastic inner container, the upper half part of the sealing gasket is attached to the opening end surface of the plastic inner container, and a certain compression amount is generated by the compression of the neck part when the neck part is assembled, so that a sealing effect is formed between the neck part and the plastic inner container; the lower half part of the sealing gasket is attached to the inner wall of the opening of the plastic liner, and is pressed by the valve to generate a certain compression amount when the valve is assembled, so that a sealing effect is formed between the pressure container and the valve.
As an improvement of the invention, the neck part and the plastic liner are assembled in a threaded connection mode, an external thread structure is arranged at the outer side of a port of the plastic liner during extrusion blow molding, a step is arranged at the inner side of the port of the neck part, internal thread structures are respectively arranged at the upper part and the lower part of the step, the lower internal thread structure is used for assembling with the plastic liner, and the step compresses the L-shaped sealing gasket when screwing. In addition, the threads above the neck piece port step are used to mount accessories such as valves.
As an improvement of the invention, the main sealing surfaces of the L-shaped sealing gaskets are all provided with a plurality of circumferential bulges, and the arrangement interval and the number can be determined according to specific implementation conditions, so that the compression amount and the compression strength of the sealing gaskets can be increased at the circumferential bulges when the neck part and the valve accessory are assembled to press the gaskets, thereby enhancing the sealing effect.
As an improvement of the invention, the plastic liner is provided with an inward sinking step at the matching point with the edge of the circular piece part of the neck part, so that when the neck part is assembled on the plastic liner, the outer surfaces of the two parts can have a smooth transition, thereby facilitating the subsequent winding of the fiber supporting cover. The plastic inner container, the sealing gasket, the neck part and the fiber supporting cover form a plastic inner container assembly, and a step is arranged at the lower part of the connecting end of the valve and other accessories to accommodate the L-shaped sealing gasket in consideration of the matching of the valve and other accessories with the inner container assembly, and meanwhile, the sealing gasket generates a certain compression amount to form a sealing effect. And meanwhile, the outer side of the top of the connecting end head of the accessory such as the valve is provided with an arc chamfer, so that the valve is convenient to install and the sealing gasket is not damaged. The sealing performance of the plastic liner and the neck part and the sealing performance of the plastic liner assembly and accessories such as the valve can be greatly improved, the potential gas escape leakage path can be effectively sealed through the sealing of the sealing gasket, and the neck part, the liner and the valve accessories form an effective sealing effect.
A high pressure composite container provided with a sealing structure, characterized in that the container comprises a plastic inner container, the plastic inner container is provided with a neck part connected with the plastic inner container, and a supporting cover at least partially surrounding the plastic inner container and the neck part, the neck part is arranged in an opening area of the neck part of the container, and at least one sealing ring is arranged between the neck part and the plastic inner container; the inner wall or the outer wall of the cavity of the liner near the container port is tightly attached to the neck part, and gas molecules are prevented from leaking on the path of the matching surface of the inner wall or the outer wall of the cavity of the liner near the container port by adopting a sealing gasket mode; the container is formed by extrusion blow molding to obtain a plastic inner container, wherein the plastic inner container is surrounded by a fiber supporting cover formed by reinforcing fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin; the plastic inner container is formed by blow molding, the neck part is arranged on the inner side of the plastic inner container, the plastic inner container blank in a molten state is compacted with the neck part after the mold is closed, a circumferential groove with a certain width is formed in the upper surface of the disc part of the neck part, the blank is extruded into the groove during mold closing, and the plastic inner container and the neck part form a whole, so that the connection reliability is enhanced.
As an improvement of the invention, a sealing gasket is arranged above the edge of the plastic liner matched with the neck part 4, a metal gasket is arranged above the sealing gasket, the upper part of the metal gasket is tightly pressed by a fastening collar, the fastening collar is made of metal materials, the metal collar is connected with the neck part in a threaded fit mode, and when the fastening collar is screwed down, the bottom of the fastening collar acts on the sealing gasket through the metal gasket, so that the sealing gasket generates a certain compression amount to form a sealing effect.
As an improvement of the invention, a step is arranged at the inner side of the port of the neck part, a sealing ring is arranged below the step, and when the valve is installed, the lower end surface of the valve presses the sealing ring tightly, so that the sealing ring generates a certain compression amount, a sealing effect is formed, and the sealing performance of the valve relative to the liner assembly is enhanced.
As an improvement of the invention, when the neck piece circular piece part is adhered to the surface of the plastic inner container, the surface of the neck piece circular piece part is provided with a plurality of circular through holes distributed circumferentially, and when the mold is closed for molding, a material blank of the plastic inner container can be extruded into the circular holes, and after cooling and qualitative, the connection between the neck piece and the plastic inner container can be reinforced, and meanwhile, the neck piece is prevented from rotating circumferentially relative to the plastic inner container. In addition, the number and the size of the circular through holes can be adjusted according to actual needs, and it is easy to think that the shape of the through holes can be designed into square shapes or cross shapes.
Compared with the prior art, the neck sealing structure of the pressure container has the advantages that the assembly of accessories such as a bottle mouth valve is considered, and the sealing performance of the container is greatly enhanced by adopting a sealing gasket and a sealing ring on the whole arrangement. Besides threaded connection sealing between the valve and the plastic liner assembly, the sealing gasket/ring sealing mode is added, escape and leakage of gas molecules are effectively avoided, and the safety performance of the product is improved.
Drawings
Figure 1 is a schematic view of a partial external appearance of a pressure vessel according to the invention,
figure 2 is a longitudinal cross-sectional view of embodiment 1 of the present invention,
figure 3 is an enlarged cross-sectional view of the neck attachment region of figure 2,
figure 4 is an enlarged view of figure 3 at the sealing area,
FIG. 5 is a longitudinal sectional view of embodiment 2 of the present invention;
FIG. 6 is an enlarged cross-sectional view of FIG. 5 at the neck attachment area;
FIG. 7 is an enlarged view of FIG. 6 at the sealing area;
FIG. 8 is a schematic diagram of a prior art pressure vessel;
FIG. 9 is a schematic view of a seal structure;
in the figure: the pressure vessel comprises a pressure vessel body, a plastic liner, a 3-fiber supporting cover, a 4-neck part, accessories such as a 5 valve, a 6 sealing gasket, a 7-thread structure, an 8-thread structure, a 9-sunk step, a 10-circumferential bulge structure, an 11-arc chamfer, a 12-sealing gasket, a 13-metal gasket, a 14-fastening collar, a 15-sealing ring, a 16-thread structure, a 17-thread structure, an 18-circumferential groove, a 19-through hole and a 20-circumferential bulge structure.
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. 1-4, a high pressure composite container provided with a sealing structure, the container comprising a plastic liner 2, the plastic liner 2 having a neck part 4 connected to the plastic liner, and a support cap 3 at least partially surrounding the plastic liner and the neck part, the neck part being provided in the open area of the neck of the container, at least one sealing ring being provided between the neck part and the plastic liner; the inner wall or the outer wall of the cavity of the inner container near the container port is tightly attached to the neck part, gas molecules are prevented from leaking on the path of the matching surface of the inner container and the neck part by adopting a sealing gasket mode, the plastic inner container is obtained by extrusion blow molding, the plastic inner container is surrounded by a fiber supporting cover formed by reinforced fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin. For the plastic liner, thermoplastic plastics such as nylon, HDPE, polyester, PP, POM and the like which are commonly used in the current commerce are considered, meanwhile, the plastic liner can adopt a multi-layer structure, and a barrier layer is added in the middle of the plastic liner to prevent permeation of small molecules such as hydrogen molecules and the like. The fiber support cover 3 may be composed of carbon fiber, glass fiber or the like. Preferably, the fiber support cover is made by winding a plastic liner with resin-impregnated fibers or filaments.
As can be seen in fig. 2 to 7, the pressure vessel 1 according to the invention is formed from a plastic liner 2, a neck part 4 preferably made of an aluminum alloy, and a fiber support cap 3 wound around the outer surface of the plastic liner. The neck part 4 comprises a cylindrical part and a disc part which are similar in structure to a flange, a mounting threaded hole in the neck part 4 is used for mounting an accessory 5 such as a valve, and furthermore the mounting threaded hole of the neck part 4 is arranged coaxially with the container opening of the plastic liner 2. The neck part is preferably made of metal and is a one-piece part, and metal materials such as aluminum alloy can be considered, and threads suitable for connecting with accessories such as a valve are designed in the inner hole of the neck part, so that the sealing of the valve and the neck part is ensured in a threaded sealing mode. In addition, the valve and the pressure container are provided with another seal formed by the sealing gasket or the sealing ring, so that the sealing effect between the container and the valve is enhanced. The neck part according to the invention, also called a connecting piece or a metal end, is composed of a cylindrical part, which adjoins the plastic liner port, and a disc part, which adjoins the liner wall in the vicinity of the container port, according to its external shape.
In the embodiment of the pressure vessel according to fig. 2 to 4, the plastic liner 2 is connected to the neck part 4 by means of a screw thread 8, and an annular sealing gasket 6 with an L-shaped cross section is arranged between the mating end faces of the plastic liner 2 and the neck part 4. In the embodiment, after the plastic liner 2 is subjected to blow molding, the neck part 4 is installed in a mode of assembling from the outside, the sealing gasket 6 is firstly put into the end face of the plastic liner 2 to be matched during assembling, then the neck part 4 is installed, the neck part 4 compresses the sealing gasket 6 to generate a certain compression amount when the neck part 4 is screwed down, a sealing effect is formed, and finally the fiber supporting cover 3 is wound, so that the stability of the port structure is enhanced.
It can be seen from fig. 3 that the joint of the accessory 5 such as a valve is connected with the neck member 4 by the screw thread 7, and the end of the accessory 5 such as a valve is provided with a step for accommodating the sealing gasket 6, and when the accessory 5 such as a valve is installed, the outer side wall of the end presses the sealing gasket 6 to form a sealing effect. At the position where the edge of the circular piece part of the neck part 4 is matched with the plastic liner 2, the plastic liner 2 is provided with an inward sinking step 9, so that the matching surface of the neck part 4 and the plastic liner 2 can be in smooth transition, and the fiber supporting cover 3 is convenient to wind.
As can be seen from fig. 4, the main contact surfaces of the sealing gasket 6 and the plastic liner 2, the neck part 4, the valve and other accessories 5 are all provided with a circumferential bulge structure 10, and when the sealing gasket 6 is pressed, the circumferential bulge structure 10 can generate larger compression amount, so that the sealing performance is enhanced. The end of the accessories 5 such as the valve and the like is provided with a circular arc chamfer 11, so that the installation convenience is improved, and the sealing gasket 6 is prevented from being damaged.
The plastic inner container, the sealing gasket, the neck part and the fiber supporting cover form a plastic inner container assembly, and a step is arranged at the lower part of the connecting end of the valve and other accessories to accommodate the L-shaped sealing gasket in consideration of the matching of the valve and other accessories with the inner container assembly, and meanwhile, the sealing gasket generates a certain compression amount to form a sealing effect. And meanwhile, the outer side of the top of the connecting end head of the accessory such as the valve is provided with an arc chamfer, so that the valve is convenient to install and the sealing gasket is not damaged. The sealing performance of the plastic liner and the neck part and the sealing performance of the plastic liner assembly and accessories such as the valve can be greatly improved by the mode, and as shown in the figure 3, the potential gas escape leakage path can be effectively sealed by sealing the sealing gasket, and the neck part, the liner and the valve accessories form an effective sealing effect.
Example 2: referring to fig. 5-7, a high pressure composite container provided with a sealing structure, the container comprising a plastic liner 1, the plastic liner 1 having a neck part 4 connected to the plastic liner, and a support cap 3 at least partially surrounding the plastic liner and the neck part, the neck part being provided in the open area of the neck of the container, at least one sealing ring being provided between the neck part and the plastic liner; the inner wall or the outer wall of the cavity of the liner near the container port is tightly attached to the neck part, and gas molecules are prevented from leaking on the path of the matching surface of the inner wall or the outer wall of the cavity of the liner near the container port by adopting a sealing gasket mode; the container is formed by extrusion blow molding to obtain a plastic inner container, wherein the plastic inner container is surrounded by a fiber supporting cover formed by reinforcing fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin; the plastic inner container is formed by blow molding, the neck part is arranged on the inner side of the plastic inner container, the plastic inner container blank in a molten state is compacted with the neck part after the mold is closed, a circumferential groove with a certain width is formed in the upper surface of the disc part of the neck part, the blank is extruded into the groove during mold closing, and the plastic inner container and the neck part form a whole, so that the connection reliability is enhanced. The neck part 4 is placed during blow molding of the plastic liner 2, and the preform of the plastic liner 2 is pushed into the recess 18 of the neck part 4 during closing of the mold during blow molding, the plastic liner 2 forming a whole with the neck part 4. An annular sealing gasket 12 is arranged above the matching edge of the plastic liner 2 and the neck part 4, a metal gasket 13 is arranged above the sealing gasket 12, the metal gasket 13 compresses the sealing gasket 12 through a fastening collar 14, the fastening collar 14 is connected with the neck part 4 through threads 16, and when the fastening collar 14 is screwed down, the sealing gasket 12 generates a certain compression amount to form a sealing effect. And the lower surface of the sealing gasket, which is in contact with the plastic liner and the neck part, is provided with a plurality of circumferentially protruding structures, so that the compression amount and the compression strength of the sealing gasket are increased, and the sealing effect is enhanced. The inner side and the outer side of the cylindrical part of the neck part are respectively provided with a thread structure, the threads on the outer side are used for installing a fastening lantern ring, the neck part and the fastening lantern ring clamp the plastic liner, and the position stability of the neck part relative to the plastic liner is enhanced; the inner thread is used for installing accessories such as valves and the like. As shown in fig. 5, the sealing gasket and the sealing ring seal the potential gas escape leakage path effectively, and the neck part, the plastic liner and the valve form an effective sealing effect, that is, the whole liner assembly forms an effective sealing whole. As can be seen from fig. 6, the accessory 5 such as a valve is connected with the neck part 4 through the screw thread 17, a step is arranged on the end face of the neck part 4, a sealing ring 15 is arranged below the step, when the accessory 5 such as the valve is assembled, the sealing ring 15 is firstly put in, then the accessory 5 such as the valve is installed, and when the accessory 5 such as the valve is screwed, the end face of the accessory 5 such as the valve compresses the sealing ring 15 to generate a certain compression amount, so that a sealing effect is formed. As can be seen from fig. 6, a plurality of through holes 19, 8 in number, are arranged circumferentially in the disc portion of the neck part 4, and the blank of material is pushed into the through holes 19 during blow molding of the plastic liner 2, preventing the neck part 4 from rotating relative to the plastic liner 2. As can be seen from fig. 7, the lower surface of the gasket 12 is provided with 4 circumferential protruding structures 20, wherein the contact surfaces with the plastic liner 2 and the neck part 4 are respectively provided with two channels, and when the gasket 12 is compressed, the circumferential protruding structures 20 can increase the compression amount, so that the sealing performance is improved.
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 (5)

1. A high pressure composite container provided with a sealing structure, characterized in that the container comprises a plastic inner container, the plastic inner container is provided with a neck part connected with the plastic inner container, and a supporting cover at least partially surrounding the plastic inner container and the neck part, the neck part is arranged in an opening area of the neck part of the container, and at least one sealing ring is arranged between the neck part and the plastic inner container; the inner wall or the outer wall of the cavity of the inner container near the container port is tightly attached to the neck part, gas molecules are prevented from leaking on the path of the matching surface of the inner container and the neck part in a sealing gasket mode, the plastic inner container is obtained by extrusion blow molding, the plastic inner container is surrounded by a fiber supporting cover formed by reinforced fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin;
after the plastic inner container is blow-molded, assembling the neck part from the outside, wherein an annular sealing gasket with an L-shaped section is arranged between the matching surfaces of the neck part and the plastic inner container, the upper half part of the sealing gasket is attached to the opening end surface of the plastic inner container, and the neck part is compressed by the neck part to generate a certain compression amount when assembled, so that a sealing effect is formed between the neck part and the plastic inner container; the lower half part of the sealing gasket is attached to the inner wall of the opening of the plastic liner, and is compressed by the valve to generate a certain compression amount when the valve is assembled, so that a sealing effect is formed between the pressure container and the valve;
the neck part is assembled with the plastic inner container in a threaded connection mode, an external thread structure is arranged on the outer side of a port of the plastic inner container during extrusion blow molding, a step is arranged on the inner side of the port of the neck part, internal thread structures are respectively arranged on the upper portion and the lower portion of the step, the internal thread structure on the lower portion is used for being assembled with the plastic inner container, and the step compresses the L-shaped sealing gasket when being screwed.
2. The high-pressure composite container with the sealing structure according to claim 1, wherein a plurality of circumferential protrusions are arranged on the main sealing surfaces of the L-shaped sealing gaskets, and the compression amount and the compression strength of the sealing gaskets can be increased at the circumferential protrusions when the neck part and the valve accessory are assembled to press the gaskets, so that the sealing effect is enhanced.
3. The high pressure composite container with sealing structure according to claim 2, wherein the plastic liner is provided with an inward-sinking step at the matching point with the edge of the circular piece part of the neck part, so that the outer surfaces of the neck part and the plastic liner can have a smooth transition when the neck part is assembled on the plastic liner, and the subsequent winding of the fiber supporting cover is facilitated.
4. A high pressure composite container provided with a sealing structure, characterized in that the container comprises a plastic inner container, the plastic inner container is provided with a neck part connected with the plastic inner container, and a supporting cover at least partially surrounding the plastic inner container and the neck part, the neck part is arranged in an opening area of the neck part of the container, and at least one sealing ring is arranged between the neck part and the plastic inner container; the inner wall or the outer wall of the cavity of the liner near the container port is tightly attached to the neck part, and gas molecules are prevented from leaking on the path of the matching surface of the inner wall or the outer wall of the cavity of the liner near the container port by adopting a sealing gasket mode; the container is formed by extrusion blow molding to obtain a plastic inner container, wherein the plastic inner container is surrounded by a fiber supporting cover formed by reinforcing fibers and glass limitation, and the fibers are embedded into a matrix formed by synthetic resin;
the plastic inner container is formed by blow molding, the neck part is arranged on the inner side of the plastic inner container, a molten plastic inner container blank and the neck part are compacted after the mold is closed, a circumferential groove with a certain width is formed in the upper surface of a circular piece part of the neck part, the blank is extruded into the groove during mold closing, and the plastic inner container and the neck part form a whole, so that the reliability of connection is enhanced;
a sealing gasket is arranged above the matched edge of the plastic liner and the neck part, a metal gasket is arranged above the sealing gasket, the upper part of the metal gasket is tightly pressed by a fastening lantern ring, the fastening lantern ring is made of metal materials, the metal lantern ring is connected with the neck part in a threaded matching way, and when the fastening lantern ring is screwed down, the bottom of the fastening lantern ring acts on the sealing gasket through the metal gasket, so that the sealing gasket generates a certain compression amount to form a sealing effect;
the inner side of the neck part port is provided with a step, a sealing ring is arranged below the step, and when the valve is installed, the lower end face of the valve tightly presses the sealing ring, so that the sealing ring generates a certain compression amount, a sealing effect is formed, and the sealing performance of the valve relative to the liner assembly is enhanced.
5. The high-pressure composite container with the sealing structure according to claim 4, wherein a plurality of circular through holes distributed circumferentially are formed on the surface of the circular piece part of the neck part, and when the mold is closed, a material blank of the plastic inner container can be extruded into the circular holes, and the connection between the neck part and the plastic inner container can be reinforced after cooling and qualitative.
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