CN219263931U - Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder - Google Patents
Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder Download PDFInfo
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- CN219263931U CN219263931U CN202222759845.1U CN202222759845U CN219263931U CN 219263931 U CN219263931 U CN 219263931U CN 202222759845 U CN202222759845 U CN 202222759845U CN 219263931 U CN219263931 U CN 219263931U
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- 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
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Abstract
The utility model discloses a multistage sealing structure of a high-pressure gas cylinder with a plastic lining and a fiber reinforced composite material. The bottle mouth end of the high-pressure gas bottle is a plastic lining, the upper end of the plastic lining is attached to the metal bottle mouth valve seat through rotational molding, the metal bottle mouth valve seat lining is arranged in the central hole of the metal bottle mouth valve seat, and the bottle mouth valve is in threaded sleeve connection with the upper end of the central through hole of the metal bottle mouth valve seat lining; an O-shaped ring is arranged between the inner peripheral surface of the inner liner of the valve seat of the metal bottle mouth and the outer peripheral surface of the valve seat of the bottle mouth, and gaskets are arranged on the lower end surface of the valve seat of the bottle mouth and the upper end surface of the valve seat of the metal bottle; the inner side part of the upper end of the plastic lining extends towards the center of the central hole of the valve seat of the metal bottle mouth and is embedded into a groove formed in the bottom end of the lining of the valve seat of the metal bottle mouth after passing through the inner peripheral surface of the lower end of the central hole. The utility model adopts the multistage sealing structure and the self-tightening sealing structure of the high-pressure gas cylinder, and the higher the gas pressure increases along with the increase of the internal pressure of the gas cylinder, the tighter the pressure between the plastic liner and the valve seat of the metal bottle mouth is, so that the sealing of the high-pressure gas cylinder is more reliable.
Description
Technical Field
The utility model relates to high-pressure gas storage equipment, in particular to a multistage sealing structure of a plastic lining fiber reinforced composite material high-pressure hydrogen storage cylinder.
Background
As the pressure of the gas cylinder is higher, the design difficulty of the gas cylinder sealing structure is higher. The working pressure of the high-pressure hydrogen storage cylinder reaches 70MPa, the pressure test reaches 105MPa, and the requirement on the reliability of the sealing structure is very high. In particular to a structure of IV type gas cylinders such as a plastic liner high-pressure hydrogen storage cylinder, the design difficulty of reliable sealing structure of the bottle mouth is very high.
There are many patents related to the structure of the IV type gas cylinder, such as U.S. Pat. No. 5,6778,2 to Korean composite research Co., ltd, a design of a port of a metal gas cylinder for a composite High pressure gas cylinder, U.S. Pat. No. 4, 20170276294,1 to Washington Industrial Co., ltd, high gas-tightened metallic nozzle-boss for a High pressure composite vessel, U.S. Pat. No. 3, boss and liner interface for a pressure vessel to Toyota Co., ltd, JP2006060484 "High pressure gas cylinder seal", international patent PCT/JP2009/060067 to Toyota Automation Co., ltd, "manufacturing method of gas cylinders and gas cylinders", utility model patent CN201721786654.7 of medium technology (Chengdu), a structure of a tail of a plastic inner container with an outer diameter of more than 200mm for a High pressure gas cylinder, utility model patent ZL201920758782.3 of Jiangsu hydrogen-rich energy technology equipment Co., ltd, a structure of a plastic inner container carbon fiber fully wound hydrogen storage gas cylinder bottleneck, etc. The patent designs the sealing structure of the gas cylinder in a related manner, has various structural forms, and can realize sealing in the gas storage use process. However, these structures are complicated to manufacture, have high requirements for processing precision, are only suitable for injection molding, require plastic butt welding, have high difficulty and high cost, and have high structural reliability.
Disclosure of Invention
In order to overcome the problems in the background technical field, the utility model provides a multistage sealing structure of a plastic lining fiber reinforced composite material high-pressure gas cylinder, which realizes multistage sealing under high pressure, and the lining does not need welding, and has the advantages of simple and reliable structure, simple manufacture and reliable sealing.
The technical scheme adopted by the utility model is as follows:
the utility model comprises a metal bottleneck valve seat, a metal bottleneck valve seat lining, a bottleneck valve O-shaped ring, a bottleneck valve, a gasket and a fiber reinforced layer outside a plastic lining; the bottleneck end of the high-pressure gas cylinder is processed into a plastic lining, the upper end of the plastic lining is attached to a metal bottleneck valve seat through rotational molding, the metal bottleneck valve seat is provided with a central hole, a metal bottleneck valve seat lining is arranged in the central hole, and a bottleneck valve sleeve is arranged at the upper end of a central through hole of the metal bottleneck valve seat lining and connected through threads; a bottleneck valve O-shaped ring is arranged between the inner peripheral surface of the metal bottleneck valve seat liner and the outer peripheral surface of the bottleneck valve for sealing, and a gasket is also arranged between the lower end surface of the bottleneck valve and the upper end surface of the metal gas cylinder valve seat; the inner side of the upper end of the plastic lining extends towards the center of the central hole of the valve seat of the metal bottle mouth and is embedded and connected with a groove arranged at the bottom end of the lining of the valve seat of the metal bottle mouth through the inner peripheral surface of the lower end of the central hole of the valve seat of the metal bottle mouth.
The plastic lining is made of plastic material. The valve seat of the metal bottle mouth is made of metal materials such as aluminum alloy. The inner lining of the valve seat of the metal bottle mouth is made of metal materials such as stainless steel.
The inner liner of the metal bottleneck valve seat is mainly formed by integrating an inner ring part and an outer ring part, a step is arranged in a central hole of the metal bottleneck valve seat, the inner liner of the metal bottleneck valve seat is arranged in the central hole of the metal bottleneck valve seat, and the bottom surface of the outer ring part is connected to the step surface of the central hole of the metal bottleneck valve seat through a flat gasket support; the bottom surface of inner circle part is higher than the bottom surface of outer lane part, annular groove is seted up to the bottom surface outward flange of the inner circle part of metal bottleneck disk seat inside lining, the inside part of plastics inside lining upper end extends to metal bottleneck disk seat centre bore center and imbeds in the annular groove behind the lower extreme inner peripheral face of metal bottleneck disk seat centre bore, the inner peripheral face of the outer lane part below the annular groove, and annular seal groove has been seted up to the inner peripheral face of the outer lane part that is located the annular groove below, install O type circle retaining ring in the annular seal groove, metal bottleneck disk seat inside lining O type circle is through O type circle retaining ring and plastics inside lining surface contact.
The plastic lining and the valve seat of the metal bottle mouth form a gas cylinder liner, and the fiber reinforced resin matrix composite material is wound outside the gas cylinder liner to form a fiber reinforced layer.
The lower end of the bottleneck valve or the upper end of the metal bottleneck valve seat is provided with an O-shaped ring groove, and the bottleneck valve O-shaped ring is positioned in the O-shaped ring groove to play a role in sealing.
The part outside the upper end of the plastic lining extends and wraps the outer peripheral surface of the lower end of the valve seat of the metal bottle mouth, so that the upper end of the plastic lining is integrally wrapped at the lower end of the valve seat of the metal bottle mouth.
The lower end outer peripheral surface of the metal bottleneck valve seat is provided with an annular groove, a plurality of through holes are arranged at intervals along the circumferential direction at the bottom in the annular groove, and the outer side part of the upper end of the plastic lining extends to pass through the outer peripheral surface of the lower end of the metal bottleneck valve seat and then fills the annular groove and the through holes in the annular groove, so that mutual embedding is realized.
The fiber reinforcement layer is made of carbon fiber, boron fiber, kevlar fiber, glass fiber and the like.
The metal bottleneck valve seat is made of aluminum alloy or other stainless steel or high-strength steel, and the inner lining of the metal bottleneck valve seat is made of stainless steel.
The plastic lining is made of high polymer materials such as nylon 6, nylon 66, polypropylene, HDPE, LDPE and the like.
The bottleneck valve O-shaped ring and the metal bottleneck valve seat lining O-shaped ring are sealing materials with hydrogen corrosion resistance, such as nitrile rubber, silicone rubber, polytetrafluoroethylene and the like.
The gasket and the flat gasket are made of nonmetal such as rubber, polytetrafluorethylene, PA or metal such as pure aluminum and pure copper.
The utility model has the beneficial effects that:
1. the utility model adopts a multistage sealing structure of the high-pressure gas cylinder, so that the sealing of the high-pressure gas cylinder is more reliable.
The high pressure gas, whether it leaks from that path, has a plurality of seal face structures that prevent leakage: the first-stage seal adopts a reliable mature O-shaped ring seal; the second-stage seal is a gasket seal of the end face of the valve seat of the metal bottle mouth.
2. The utility model adopts a self-tightening sealing structure, an O-shaped ring is adopted between the contact surface of the plastic lining and the valve seat of the metal bottle mouth to realize initial sealing, and the higher the acting force of the gas pressure on the plastic lining is, the tighter the pressure between the plastic lining and the valve seat of the metal bottle mouth is, and the more difficult the gas leakage is caused by the clearance between the plastic lining and the valve seat of the metal bottle mouth.
Drawings
FIG. 1 is a cross-sectional view of a seal structure of the present utility model.
In the figure: 1. bottleneck valve, 2, gasket, 3, metal bottleneck disk seat, 4, metal bottleneck disk seat inside lining, 5, bottleneck valve O type circle, 6, O type circle retaining ring, 7, metal bottleneck disk seat inside lining O type circle, 8, fiber reinforcement layer, 9, plastics inside lining, 10, flat gasket, 11, through-hole.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
As shown in fig. 1, the structure comprises a metal bottleneck valve seat 3, a metal bottleneck valve seat lining 4, a bottleneck valve O-ring 5, a bottleneck valve 1, a gasket 2 and a fiber reinforced layer 8 outside a plastic lining 9.
The bottleneck end of the high-pressure gas cylinder is processed into a plastic lining 9, and is no longer made of metal materials. The upper end of the plastic lining 9 is attached to the metal bottleneck valve seat 3 through rotational molding, the metal bottleneck valve seat 3 is provided with a central hole, the metal bottleneck valve seat lining 4 is arranged in the central hole, and the bottleneck valve 1 is sleeved at the upper end of a central through hole of the metal bottleneck valve seat lining 4 and connected through threads; the bottleneck valve O-shaped ring 5 is arranged between the inner peripheral surface of the metal bottleneck valve seat liner 4 and the outer peripheral surface of the bottleneck valve 1 to seal, and the bottleneck valve O-shaped ring is tightly pressed with the inner wall of the metal bottleneck valve seat liner 4 and keeps a continuous pressing force to play a role in sealing. A gasket 2 is arranged between the lower end face of the bottleneck valve 1 and the upper end face of the metal gas cylinder valve seat 3; when the bottleneck valve is screwed down, the gasket is pressed tightly to play a sealing role; the inner part of the upper end of the plastic lining 9 extends towards the center of the central hole of the metal bottleneck valve seat 3 and is embedded and connected with a groove formed at the bottom end of the metal bottleneck valve seat lining 4 through the inner peripheral surface of the lower end of the central hole of the metal bottleneck valve seat 3 in a tight fit manner; the part outside the upper end of the plastic lining 9 extends to the outer edge of the lower end of the metal bottleneck valve seat 3, and when in injection molding or rotational molding, the plastic is filled in the groove on the outer edge of the lower end of the metal bottleneck valve seat 3, so that mutual embedding is realized. In specific implementation, the sealing structures at the upper end and the lower end of the high-pressure gas cylinder are the same.
The metal bottleneck valve seat liner 4 is mainly formed by integrally forming a coaxial inner ring part and an outer ring part, the top surface of the inner ring part and the top surface of the outer ring part are all flush with the upper end surface of the metal bottleneck valve seat 3, a step is arranged in the central hole of the metal bottleneck valve seat 3, the step surface faces outwards, the metal bottleneck valve seat liner 4 is arranged in the central hole of the metal bottleneck valve seat 3, and the bottom surface of the outer ring part is supported and connected to the step surface of the central hole of the metal bottleneck valve seat 3 through a flat gasket 10; the bottom surface of the inner ring part is higher than the bottom surface of the outer ring part to form a lining step, the outer edge of the bottom surface of the inner ring part of the metal bottleneck valve seat lining 4 is provided with an annular groove, namely the outer edge of the lining step is provided with an annular groove, so that the metal bottleneck valve seat lining 4 integrally forms a 'n' -shape, and the upper end of the plastic lining 9 is buckled in the 'n' -shaped opening. The inner side part of the upper end of the plastic lining 9 extends towards the center of the center hole of the metal bottleneck valve seat 3 and is embedded into the annular groove after passing through the inner peripheral surface of the lower end of the center hole of the metal bottleneck valve seat 3 and the inner peripheral surface of the outer ring part below the annular groove, an annular sealing groove is formed in the inner peripheral surface of the outer ring part below the annular groove, an O-shaped ring retainer ring 6 and a metal bottleneck valve seat lining O-shaped ring 7 are arranged in the annular sealing groove, and the metal bottleneck valve seat lining O-shaped ring 7 is in surface contact with the plastic lining 9 through the O-shaped ring retainer ring 6 to form initial sealing. If an initial seal cannot be formed, the channel will continue to leak, rendering the self-seal impractical.
Meanwhile, the lower end of the bottleneck valve 1 is positioned at the annular groove of the plastic lining 9 embedded into the metal bottleneck valve seat lining 4 after being completely filled into the metal bottleneck valve seat lining 4, and meanwhile, the upper end of the plastic lining 9 is radially pressed into the annular groove of the metal bottleneck valve seat lining 4 to realize better sealing. So that the inner peripheral surface of the lower end of the metal bottleneck valve seat liner 4 is attached to the outer peripheral surface of the upper end of the plastic liner 9 through the O-shaped ring 7 of the metal bottleneck valve seat liner to realize sealing.
The plastic lining 9 and the metal bottleneck valve seat 3 form a gas cylinder liner, and a fiber reinforced resin matrix composite material is wound outside the gas cylinder liner to form a fiber reinforced layer 8.
The lower end of the bottleneck valve 1 or the upper end of the metal bottleneck valve seat 3 is provided with a plurality of O-shaped ring grooves, and the bottleneck valve O-shaped ring 5 is positioned in the O-shaped ring grooves to play a sealing role, so that the bottleneck valve 1 and the metal bottleneck valve seat 3 are tightly sealed.
The center of the metal bottleneck valve seat lining 4 is provided with a through hole, the upper end of the through hole of the metal bottleneck valve seat lining 4 is provided with a section of cylindrical internal thread, and the cylindrical thread is used for being in threaded connection with the external thread of the bottleneck valve 1.
The part outside the upper end of the plastic lining 9 extends and wraps the outer peripheral surface of the lower end of the metal bottleneck valve seat 3, so that the upper end of the plastic lining 9 is integrally wrapped at the lower end of the metal bottleneck valve seat 3.
The lower end outer peripheral surface of the metal bottleneck valve seat 3 is provided with an annular groove, a plurality of through holes 11 are arranged at intervals along the circumferential direction at the bottom in the annular groove, and the outer side part of the upper end of the plastic lining 9 extends to pass through the outer peripheral surface of the lower end of the metal bottleneck valve seat 3 and then fills the annular groove and the through holes 11 in the annular groove, so that mutual embedding is realized. The structure is specifically prepared by injection molding or rotational molding, and during injection molding or rotational molding, plastic passes through the through hole 11 and the outer peripheral surface of the lower end of the metal bottleneck valve seat 3 and then fills the annular groove at the lower end of the metal bottleneck valve seat 3, and then enters the through hole 11 to realize mutual embedding.
The principle process of the compression seal of the utility model is as follows:
the utility model forms a secondary seal of a leakage flow passage through a bottleneck valve O-shaped ring 5 and a gasket 2 between a metal bottleneck valve seat 3 and a bottleneck valve 1; the other leakage flow passage forms a secondary seal through the lining O-shaped ring 7 and the flat gasket 10; the binding force of the contact surface between the plastic lining 9 and the annular groove synchronously increases along with the increase of the internal pressure of the gas cylinder, so that the self-tightness seal is formed, namely, the higher the working pressure in the gas cylinder is, the more reliable the seal is.
Thus, the gas in the high pressure gas cylinder, no matter leaking from that one path, needs to pass through two or more than three multi-stage sealing surface structures.
Therefore, high-pressure gas in the gas cylinder cannot leak out, and effective multi-stage sealing is realized.
Therefore, the sealing structure of the high-pressure gas cylinder is provided with double guarantees that the sealing of the valve seat of the metal gas cylinder and the valve of the bottle mouth is sealed by the O-shaped ring and the gasket, and the valve seat of the metal bottle mouth and the plastic lining have double guarantees that the self-tightness performance is increased along with the increase of the internal pressure and the elastic compression ring is compressed, so that the sealing is reliable.
Claims (9)
1. A multistage sealing structure of a plastic lining fiber reinforced composite material high-pressure gas cylinder is characterized in that:
the plastic bottle mouth valve comprises a metal bottle mouth valve seat (3), a metal bottle mouth valve seat lining (4), a bottle mouth valve O-shaped ring (5), a bottle mouth valve (1), a gasket (2) and a fiber reinforcement layer (8) outside a plastic lining (9); the bottleneck end of the high-pressure gas cylinder is processed into a plastic lining (9), the upper end of the plastic lining (9) is attached to a metal bottleneck valve seat (3) through rotational molding, the metal bottleneck valve seat (3) is provided with a central hole, a metal bottleneck valve seat lining (4) is arranged in the central hole, and a bottleneck valve (1) is sleeved at the upper end of a central through hole of the metal bottleneck valve seat lining (4) and connected through threads; a bottleneck valve O-shaped ring (5) is arranged between the inner peripheral surface of the metal bottleneck valve seat liner (4) and the outer peripheral surface of the bottleneck valve (1) for sealing, and a gasket (2) is also arranged between the lower end surface of the bottleneck valve (1) and the upper end surface of the metal bottleneck valve seat (3); the inner side of the upper end of the plastic lining (9) extends towards the center of the central hole of the metal bottleneck valve seat (3) and is embedded and connected with a groove formed in the bottom end of the metal bottleneck valve seat lining (4) through the inner peripheral surface of the lower end of the central hole of the metal bottleneck valve seat (3) in a tight fit manner.
2. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 1, wherein: the metal bottleneck valve seat inner liner (4) is mainly formed by integrating an inner ring part and an outer ring part, a step is arranged in a central hole of the metal bottleneck valve seat (3), the metal bottleneck valve seat inner liner (4) is arranged in the central hole of the metal bottleneck valve seat (3), and the bottom surface of the outer ring part is supported and connected to the step surface of the central hole of the metal bottleneck valve seat (3) through a flat gasket (10);
the bottom surface of inner circle part is higher than the bottom surface of outer lane part, annular groove is seted up to the bottom surface outward flange of the inner circle part of metal bottleneck disk seat inside lining (4), the part of plastic lining (9) upper end inboard extends to metal bottleneck disk seat (3) centre bore center and imbeds the annular groove behind the lower extreme inner peripheral face of metal bottleneck disk seat (3) centre bore, the outer lane part inner peripheral face of annular groove below, and annular seal groove has been seted up to the inner peripheral face of the outer lane part that is located the annular groove below, install O type circle retaining ring (6) in the annular seal groove, metal bottleneck disk seat inside lining O type circle (7) are through O type circle retaining ring (6) and plastic lining (9) surface contact.
3. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 1, wherein: the plastic lining (9) and the metal bottleneck valve seat (3) form a gas cylinder liner, and a fiber reinforced resin matrix composite material is wound outside the gas cylinder liner to form a fiber reinforced layer (8).
4. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 1, wherein: the lower end of the bottleneck valve (1) or the upper end of the metal bottleneck valve seat (3) is provided with an O-shaped ring groove, and the bottleneck valve O-shaped ring (5) is positioned in the O-shaped ring groove to play a sealing role.
5. A plastic lined fiber reinforced composite high pressure gas cylinder multi-stage sealing structure according to claim 1 or 3, wherein:
the part outside the upper end of the plastic lining (9) extends and wraps the outer peripheral surface of the lower end of the metal bottleneck valve seat (3), so that the upper end of the plastic lining (9) is integrally wrapped at the lower end of the metal bottleneck valve seat (3).
6. The multistage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 5, wherein: the lower end outer peripheral surface of the metal bottleneck valve seat (3) is provided with an annular groove, a plurality of through holes (11) are formed in the bottom of the annular groove at intervals along the circumferential direction, and the outer side of the upper end of the plastic lining (9) extends to be full of the annular groove and the through holes (11) in the annular groove after passing through the outer peripheral surface of the lower end of the metal bottleneck valve seat (3), so that mutual embedding is realized.
7. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 1, wherein: the fiber reinforcement layer (8) is made of carbon fiber, boron fiber, kevlar fiber or glass fiber.
8. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 1, wherein: the metal bottleneck valve seat (3) is made of aluminum alloy or stainless steel or high-strength steel, and the metal bottleneck valve seat lining (4) is made of stainless steel.
9. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder as claimed in claim 1, wherein: the plastic lining (9) is made of high polymer materials such as nylon 6, nylon 66, polypropylene, HDPE and LDPE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759845.1U CN219263931U (en) | 2022-10-19 | 2022-10-19 | Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759845.1U CN219263931U (en) | 2022-10-19 | 2022-10-19 | Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder |
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| Publication Number | Publication Date |
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| CN219263931U true CN219263931U (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222759845.1U Active CN219263931U (en) | 2022-10-19 | 2022-10-19 | Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder |
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| CN (1) | CN219263931U (en) |
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2022
- 2022-10-19 CN CN202222759845.1U patent/CN219263931U/en active Active
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