CN115654355A - 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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- CN115654355A CN115654355A CN202211291402.2A CN202211291402A CN115654355A CN 115654355 A CN115654355 A CN 115654355A CN 202211291402 A CN202211291402 A CN 202211291402A CN 115654355 A CN115654355 A CN 115654355A
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- valve seat
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- bottle mouth
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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
Abstract
The invention discloses a multi-stage sealing structure of a high-pressure gas cylinder made of a plastic lining fiber reinforced composite material. The bottle mouth end of the high-pressure gas bottle is provided with a plastic lining, the upper end of the plastic lining is attached to a metal bottle mouth valve seat through rotational molding, the metal bottle mouth valve seat lining is arranged in a central hole of the metal bottle mouth valve seat, and a bottle mouth valve thread is sleeved at the upper end of a central through hole of the metal bottle mouth valve seat lining; an O-shaped ring is arranged between the inner peripheral surface of the metal bottle mouth valve seat lining and the outer peripheral surface of the bottle mouth valve, and a gasket is arranged on the lower end surface of the bottle mouth valve and the upper end surface of the metal gas bottle valve seat; the inner side part of the upper end of the plastic lining extends towards the center of the central hole of the metal bottleneck valve seat and is embedded in a groove formed at the bottom end of the lining of the metal bottleneck valve seat after passing through the inner circumferential surface of the lower end of the central hole. The invention adopts a multi-stage sealing structure and a self-tightening sealing structure of the high-pressure gas cylinder, and the pressure between the plastic lining and the valve seat of the metal bottle mouth is tighter as the acting force of the gas pressure on the plastic lining is larger along with the increase of the internal pressure of the gas cylinder, so that the sealing of the high-pressure gas cylinder is more reliable.
Description
Technical Field
The invention relates to high-pressure gas storage equipment, in particular to a multi-stage sealing structure of a high-pressure hydrogen storage cylinder made of a plastic lining fiber reinforced composite material.
Background
Along with the gas cylinder pressure is higher and higher, the gas cylinder seal structure design degree of difficulty is higher and 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. Particularly, for IV-type gas cylinder structures such as plastic lining high-pressure hydrogen storage gas cylinders, the design difficulty of the reliable sealing structure of the cylinder opening is very high.
There are many patents related to the iv-type gas cylinder structure, such as US7648042B2 "a metal cylinder port design for composite High-pressure gas cylinder, US20170276294A1" High-gas-insulated metallic non-zzle-Boss for a High-pressure composite vessel ", US20170276294A1" Boss and liner interface for a pressure vessel ", toyota JP 20060484" High-pressure gas cylinder seal ", international patent PCT/JP2009/060067" manufacturing method of gas cylinder and gas cylinder ", international patent CN201721786654.7" plastic cylinder tail structure with outer diameter larger than 200mm, and "cylinder liner winding structure of hydrogen storage cylinder, and" wo 2010758782. Of the chinese patent of hydrogen enrichment technology equipment. These patents all made relevant design to the seal structure of gas cylinder, and structural style is various, all can realize sealedly in the gas storage use. However, the structures are complex to manufacture, the requirement on processing precision is high, some structures are only suitable for injection molding and require plastic butt welding, the difficulty is high, the cost is high, and the reliability of some structures needs to be improved.
Disclosure of Invention
In order to overcome the problems in the background technical field, the invention provides the multi-stage sealing structure of the high-pressure gas cylinder made of the plastic lining fiber reinforced composite material, which realizes multi-stage sealing under high pressure, does not need welding of the lining, and has the advantages of simple and reliable structure, simple manufacture and reliable sealing.
The technical scheme adopted by the invention is as follows:
the invention 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 on the outer side of a plastic lining; the mouth 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 mouth valve seat through rotational molding, the metal mouth valve seat is provided with a central hole, the metal mouth valve seat lining is installed in the central hole, and the mouth valve is sleeved at the upper end of a central through hole of the metal mouth valve seat lining and is connected through threads; a bottleneck valve O-shaped ring is arranged between the inner circumferential surface of the metal bottleneck valve seat lining and the outer circumferential 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 part of the upper end of the plastic lining extends to the center of the center hole of the metal bottleneck valve seat and passes through the inner peripheral surface of the lower end of the center hole of the metal bottleneck valve seat to be embedded and connected with a groove arranged at the bottom end of the metal bottleneck valve seat lining in a close fit mode.
The plastic lining is made of plastic material. The metal bottleneck valve seat is made of metal materials such as aluminum alloy and the like. The lining of the valve seat of the metal bottle mouth is made of metal materials such as stainless steel.
The metal bottle mouth valve seat lining 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 bottle mouth valve seat, the metal bottle mouth valve seat lining is arranged in the central hole of the metal bottle mouth valve seat, and the bottom surface of the outer ring part is connected to the step surface of the central hole of the metal bottle mouth valve seat through a flat gasket support; the bottom surface of the inner ring part is higher than that of the outer ring part, an annular groove is formed in the outer edge of the bottom surface of the inner ring part of the metal bottleneck valve seat lining, the part of the inner side of the upper end of the plastic lining extends towards the center of the center hole of the metal bottleneck valve seat and penetrates through the inner peripheral surface of the lower end of the center hole of the metal bottleneck valve seat and the inner peripheral surface of the outer ring part below the annular groove to be embedded into 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 retaining ring and an O-shaped ring of the metal bottleneck valve seat lining are mounted in the annular sealing groove, and the O-shaped ring of the metal bottleneck valve seat lining is in surface contact with the plastic lining through the O-shaped ring retaining ring.
The plastic lining and the metal bottle mouth valve seat form a gas bottle inner container, and a fiber reinforced resin matrix composite material is wound outside the gas bottle inner container to form a fiber reinforced layer.
And an O-shaped ring groove is formed at the lower end of the bottle mouth valve or the upper end of the metal bottle mouth valve seat, and the O-shaped ring of the bottle mouth valve is positioned in the O-shaped ring groove to play a role in sealing.
The outer side of the upper end of the plastic lining extends to wrap the outer peripheral surface of the lower end of the metal bottle mouth valve seat, so that the upper end of the plastic lining is integrally wrapped at the lower end of the metal bottle mouth valve seat.
The outer peripheral surface of the lower end of the metal bottle mouth valve seat is provided with an annular groove, the bottom in the annular groove is provided with a plurality of through holes which are arranged at intervals along the circumferential direction, and the part of the outer side of the upper end of the plastic lining extends through the outer peripheral surface of the lower end of the metal bottle mouth valve seat and then is filled with the annular groove and the through holes in the annular groove, so that mutual embedding is realized.
The fiber reinforced 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 lining of the metal bottleneck valve seat is made of stainless steel.
The plastic lining is made of high-molecular 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, silicon rubber, polytetrafluoroethylene and the like.
The gasket and the flat gasket are made of nonmetal such as rubber, polytetrafluoroethylene and PA, or metal such as pure aluminum and pure copper.
The invention has the beneficial effects that:
1. the invention adopts a multi-stage sealing structure of the high-pressure gas cylinder, so that the sealing of the high-pressure gas cylinder is more reliable.
There are multiple sealing surface configurations to prevent leakage no matter which path the high pressure gas leaks from: the first-stage sealing is sealed by adopting a reliable and mature O-shaped ring; the second level of sealing is gasket sealing of the end face of the metal bottle mouth valve seat.
2. The invention adopts a self-tightening sealing structure, the contact surface between the plastic lining and the metal bottle mouth valve seat adopts an O-shaped ring to realize initial sealing, along with the increase of the internal pressure of the gas cylinder, the larger the acting force of the gas pressure on the plastic lining is, the tighter the pressure between the plastic lining and the metal bottle mouth valve seat is, and the more difficult the gas is leaked through the gap between the plastic lining and the metal bottle mouth valve seat.
Drawings
Fig. 1 is a cross-sectional view of a seal structure of the present invention.
In the figure: 1. the bottle mouth valve comprises a bottle mouth valve body, 2 parts of a gasket, 3 parts of a metal bottle mouth valve seat, 4 parts of a metal bottle mouth valve seat lining, 5 parts of a bottle mouth valve O-shaped ring, 6 parts of an O-shaped ring retainer ring, 7 parts of a metal bottle mouth valve seat lining O-shaped ring, 8 parts of a fiber reinforcement layer, 9 parts of a plastic lining, 10 parts of a flat gasket, 11 parts of a through hole.
Detailed Description
The invention is further described below with reference to the figures 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-shaped ring 5, a bottleneck valve 1, a gasket 2 and a fiber reinforced layer 8 at the outer side of a plastic lining 9.
The mouth end of the high-pressure gas cylinder is processed into a plastic lining 9 and is not 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 installed in the central hole, and the bottleneck valve 1 is sleeved at the upper end of the central through hole of the metal bottleneck valve seat lining 4 and is connected through threads; and a bottleneck valve O-shaped ring 5 is arranged between the inner circumferential surface of the metal bottleneck valve seat lining 4 and the outer circumferential surface of the bottleneck valve 1 for sealing, and plays a role in sealing by pressing against the inner wall of the metal bottleneck valve seat lining 4 and keeping continuous pressing force. A gasket 2 is also 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 bottle mouth valve is screwed down, the gasket is pressed tightly to play a sealing role; the inner side part of the upper end of the plastic lining 9 extends to the center of the center hole of the metal bottle mouth valve seat 3 and is embedded and connected with a groove arranged at the bottom end of the metal bottle mouth valve seat lining 4 in a close fit mode after passing through the inner peripheral surface of the lower end of the center hole of the metal bottle mouth valve seat 3; the part of the outer side of the upper end of the plastic lining 9 extends to the outer edge of the lower end of the metal bottle mouth valve seat 3, and when the plastic lining is subjected to injection molding or rotational molding, the groove on the outer edge of the lower end of the metal bottle mouth valve seat 3 is filled with plastic, 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 bottle mouth valve seat lining 4 is mainly integrally formed by an inner ring part and an outer ring part which are coaxial, the top surface of the inner ring part and the top surface of the outer ring part are flush with the upper end surface of the metal bottle mouth valve seat 3, a step is arranged in the central hole of the metal bottle mouth valve seat 3, the step surface faces outwards, the metal bottle mouth valve seat lining 4 is arranged in the central hole of the metal bottle mouth 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 bottle mouth 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 is integrally formed into a 'l' shape, and the upper end of the plastic lining 9 is buckled in the 'l' shaped opening. The inner side 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 check ring 6 and a metal bottleneck valve seat lining O-shaped ring 7 are installed 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 check ring 6 to form initial sealing. If the initial seal cannot be made, the passage will continue to leak, thereby rendering the self-sealing impossible.
Meanwhile, the lower end of the bottleneck valve 1 is positioned at the annular groove position where the upper end of the plastic lining 9 is embedded into the metal bottleneck valve seat lining 4 after being completely arranged into the metal bottleneck valve seat lining 4, and the upper end of the plastic lining 9 is radially compressed in the annular groove of the metal bottleneck valve seat lining 4 to realize better sealing. Therefore, the inner peripheral surface of the lower end of the metal bottleneck valve seat lining 4 is attached to the outer peripheral surface of the upper end of the plastic lining 9 through the metal bottleneck valve seat lining O-shaped ring 7 to realize sealing.
The plastic lining 9 and the metal bottle mouth valve seat 3 form a gas bottle inner container, and a fiber reinforced resin matrix composite material is wound outside the gas bottle inner container to form a fiber reinforced layer 8.
A plurality of O-shaped ring grooves are formed in the lower end of the bottleneck valve 1 or the upper end of the metal bottleneck valve seat 3, and the bottleneck valve O-shaped ring 5 is located 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.
A through hole is formed in the center of the metal bottleneck valve seat lining 4, a section of cylindrical internal thread is arranged at the upper end of the through hole of the metal bottleneck valve seat lining 4, and the cylindrical internal thread is used for being in threaded connection with the external thread of the bottleneck valve 1.
The part of the outer side of 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 outer peripheral surface of the lower end of the metal bottle mouth valve seat 3 is provided with an annular groove, the bottom in the annular groove is provided with a plurality of through holes 11 which are arranged at intervals along the circumferential direction, and the part of the outer side of the upper end of the plastic lining 9 extends through the outer peripheral surface of the lower end of the metal bottle mouth valve seat 3 to be filled with the annular groove and the through holes 11 in the annular groove, so that mutual embedding is realized. The structure is 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 bottle mouth valve seat 3 and then is filled with the annular groove entering the lower end of the metal bottle mouth valve seat 3 and then enters the through hole 11 to realize mutual embedding.
The principle process of the compression sealing of the invention is as follows:
according to the invention, a secondary seal of a leakage flow channel is formed by 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 secondary sealing through the lining O-shaped ring 7 and the flat gasket 10; the contact surface binding force between the plastic liner 9 and the annular groove is synchronously increased along with the increase of the internal pressure of the gas cylinder, so that the self-tightening 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 which path the gas leaks, needs to pass through two or more 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 high-pressure gas cylinder sealing structure provided by the invention has the double guarantee that the sealing of the metal gas cylinder valve seat and the cylinder port valve is realized through the O-shaped ring sealing and the gasket sealing, the metal cylinder port valve seat and the plastic lining have the double guarantee of self-tightening sealing performance increase and elastic pressing ring pressing along with the increase of internal pressure, and the sealing is reliable.
Claims (9)
1. Multistage seal structure of plastics inside lining fiber reinforcement combined material high pressure cylinder, its characterized in that:
comprises a metal bottleneck valve seat (3), a metal bottleneck valve seat lining (4), a bottleneck valve O-shaped ring (5), a bottleneck valve (1), a gasket (2) and a fiber reinforced layer (8) at the outer side of a plastic lining (9); the mouth 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 mouth valve seat (3) through rotational molding, the metal mouth valve seat (3) is provided with a central hole, a metal mouth valve seat lining (4) is installed in the central hole, and a mouth valve (1) is sleeved at the upper end of the central through hole of the metal mouth valve seat lining (4) and is connected with the upper end of the central through hole through threads; a bottleneck valve O-shaped ring (5) is arranged between the inner peripheral surface of the metal bottleneck valve seat lining (4) and the outer peripheral surface of the bottleneck valve (1) for sealing, and a gasket (2) is arranged between the lower end surface of the bottleneck valve (1) and the upper end surface of the metal gas cylinder valve seat (3); the inner side of the upper end of the plastic lining (9) extends to the center of the center hole of the metal bottleneck valve seat (3) and is embedded and connected with a groove arranged at the bottom end of the metal bottleneck valve seat lining (4) in a tight fit mode after passing through the inner peripheral surface of the lower end of the center hole of the metal bottleneck valve seat (3).
2. The multi-stage sealing structure of the plastic lining fiber reinforced composite material high-pressure gas cylinder as claimed in claim 1, characterized in that: the metal bottle mouth valve seat lining (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 bottle mouth valve seat (3), the metal bottle mouth valve seat lining (4) is arranged in the central hole of the metal bottle mouth 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 bottle mouth 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, 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, 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 passes through the inner peripheral surface of the lower end of the center hole of the metal bottleneck valve seat (3), the inner peripheral surface of the outer ring part below the annular groove is embedded into 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 check ring (6) is installed in the annular sealing groove, an O-shaped ring (7) is installed in the metal bottleneck valve seat lining, and the O-shaped ring (7) of the metal bottleneck valve seat lining is in surface contact with the plastic lining (9) through the O-shaped ring check ring (6).
3. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder according to claim 1, characterized in that: the plastic liner (9) and the metal bottle mouth valve seat (3) form a gas bottle inner container, and a fiber reinforced resin matrix composite material is wound outside the gas bottle inner container to form a fiber reinforced layer (8).
4. The multi-stage sealing structure of the plastic lining fiber reinforced composite material high-pressure gas cylinder as claimed in claim 1, characterized in that: an O-shaped ring groove is formed in the lower end of the bottleneck valve (1) or the upper end of the metal bottleneck valve seat (3), and an O-shaped ring (5) of the bottleneck valve is positioned in the O-shaped ring groove to play a role in sealing.
5. The multi-stage sealing structure of the high-pressure gas cylinder made of the plastic-lined fiber-reinforced composite material according to claim 1 or 3, characterized in that:
the outer side of 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 multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder according to claim 5, characterized in that: the outer peripheral surface of the lower end of the metal bottle mouth valve seat (3) is provided with an annular groove, the bottom in the annular groove is provided with a plurality of through holes (11) which are arranged at intervals along the circumferential direction, and the part of the outer side of the upper end of the plastic lining (9) extends through the outer peripheral surface of the lower end of the metal bottle mouth valve seat (3) to be filled with the through holes (11) in the annular groove and the annular groove, so that mutual embedding is realized.
7. The multi-stage sealing structure of the plastic lining fiber reinforced composite material high-pressure gas cylinder as claimed in claim 1, characterized in that: the fiber reinforced layer (8) is made of carbon fiber, boron fiber, kevlar fiber, glass fiber and the like.
8. The multi-stage sealing structure of the plastic-lined fiber-reinforced composite high-pressure gas cylinder according to claim 1, characterized in that: 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 lining fiber reinforced composite material high-pressure gas cylinder as claimed in claim 1, characterized in that: the plastic inner liner (9) is made of high molecular polymer materials of nylon 6, nylon 66, polypropylene, HDPE and LDPE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211291402.2A CN115654355A (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 |
|---|---|---|---|
| CN202211291402.2A CN115654355A (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 |
|---|---|
| CN115654355A true CN115654355A (en) | 2023-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211291402.2A Pending CN115654355A (en) | 2022-10-19 | 2022-10-19 | Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115654355A (en) |
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2022
- 2022-10-19 CN CN202211291402.2A patent/CN115654355A/en active Pending
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