CN219263931U - Multistage sealing structure of plastic lining fiber reinforced composite material high-pressure gas cylinder - Google Patents

Abstract

The utility model discloses a multi-stage sealing structure of a plastic-lined fiber-reinforced composite material high-pressure gas cylinder. The bottle mouth end of the high-pressure gas cylinder is a plastic lining, and the upper end of the plastic lining is bonded with the metal bottle mouth valve seat through rotational molding. The thread is set on the upper end of the central through hole of the inner lining of the metal bottle mouth valve seat; there is an O-ring between the inner peripheral surface of the metal bottle mouth valve seat lining and the outer peripheral surface of the bottle mouth valve, and the lower end surface of the bottle mouth valve is connected to the metal cylinder valve seat. There is a gasket on the end face; the inner part of the upper end of the plastic lining extends to the center of the center hole of the metal bottle mouth valve seat and is embedded in the groove opened at the inner substrate end of the metal bottle mouth valve seat after passing through the inner peripheral surface of the lower end of the center hole. The utility model adopts a multi-stage sealing structure and a self-tightening sealing structure of a high-pressure gas cylinder. With the increase of the internal pressure of the gas cylinder, the force of the gas pressure on the plastic inner lining is greater, and the pressure between the plastic inner lining and the valve seat of the metal bottle mouth is tighter. The tighter it is, the more reliable the seal of the high-pressure cylinder is.

Description

A plastic-lined fiber-reinforced composite material high-pressure cylinder multi-stage sealing structure

technical field

The utility model relates to a high-pressure gas storage device, in particular to a multi-stage sealing structure of a plastic-lined fiber-reinforced composite material high-pressure hydrogen storage cylinder.

Background technique

As the pressure of the gas cylinder becomes higher and higher, the design of the sealing structure of the gas cylinder becomes more and more difficult. The working pressure of the high-pressure hydrogen storage cylinder reaches 70MPa, and the pressure test reaches 105MPa, which requires very high reliability of the sealing structure. Especially for type IV gas cylinder structures such as plastic-lined high-pressure hydrogen storage cylinders, it is very difficult to design a reliable sealing structure for the bottle mouth.

There are many patents on the structure of type IV gas cylinders, such as the US Patent US7648042B2 of Korea Composite Materials Research Co., Ltd. "a metal gas cylinder port design for composite high-pressure gas storage cylinders", and the US patent of Worthington Industries, Inc. US20170276294A1 "High gas-tightened metallic nozzle-boss for a high pressure composite vessel", US20170276294A1 "Boss and liner interface for apressure vessel", Toyota Corporation JP2006060484 "High pressure gas cylinder sealing", international patent PCT/JP of Toyota Motor Corporation 2009/ 060067 "Gas storage tank and method of making the gas storage tank", utility model patent CN201721786654.7 of Sinoma Science and Technology (Chengdu) Co., Ltd. "Neck and tail structure of high-pressure gas storage cylinder with plastic inner liner and outer diameter greater than 200mm", Jiangsu Guofu Hydrogen Energy Technology Equipment Co., Ltd.'s utility model patent ZL201920758782.3 "a plastic inner carbon fiber fully wound hydrogen storage bottle mouth structure" and so on. These patents have made relevant designs for the sealing structure of the gas cylinder, and the structural forms are various, and the sealing can be realized during the gas storage and use. However, these structures are complicated to manufacture and require high processing precision. Some are only suitable for injection molding and require plastic butt welding, which is difficult and expensive, and the reliability of some structures needs to be improved.

Utility model content

In order to overcome the problems existing in the background technical field, the utility model provides a multi-stage sealing structure of a plastic-lined fiber-reinforced composite material high-pressure gas cylinder, which realizes multi-stage sealing under high pressure, the inner lining does not need to be welded, and the structure is simple and reliable. Simple, reliable sealing.

The technical scheme that the utility model adopts is:

The utility model comprises a metal bottle mouth valve seat, a metal bottle mouth valve seat lining, a bottle mouth valve O-ring, a bottle mouth valve, a gasket and a fiber reinforced layer on the outside of the plastic lining; the bottle mouth end of the high-pressure gas cylinder is processed into Plastic lining, the upper end of the plastic lining and the metal bottle mouth valve seat are pasted together by rotational molding, the metal bottle mouth valve seat is provided with a central hole, the metal bottle mouth valve seat lining is installed in the center hole, and the bottle mouth valve is set The upper end of the central through hole of the bottle mouth valve seat lining is connected by threads; the bottle mouth valve O-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 for sealing, and the bottle mouth There is also a gasket between the lower end surface of the valve and the upper end surface of the metal cylinder valve seat; the inner part of the upper end of the plastic lining extends to the center hole center of the metal bottle mouth valve seat and passes through the lower end of the metal bottle mouth valve seat center hole. The peripheral surface is embedded and connected to the groove opened at the end of the inner substrate of the metal bottle mouth valve seat and tightly fitted.

The plastic lining is made of plastic. The metal bottle mouth valve seat is made of aluminum alloy and other metal materials. The inner lining of the metal bottle mouth valve seat is made of metal materials such as stainless steel.

The metal bottle mouth valve seat lining is mainly composed of an inner ring part and an outer ring part, a step is set in the center hole of the metal bottle mouth valve seat, and the metal bottle mouth valve seat lining is placed in the center of the metal bottle mouth valve seat. In the hole and the bottom surface of the outer ring part is connected to the step surface of the center hole of the metal bottle mouth valve seat through flat gasket support; the bottom surface of the inner ring part is higher than the bottom surface of the outer ring part, and the inner ring of the metal bottle mouth valve seat lining There is an annular groove on the outer edge of the bottom surface of the part, and the inner part of the upper end of the plastic lining extends to the center hole center of the metal bottle mouth valve seat and passes through the inner peripheral surface of the lower end of the metal bottle mouth valve seat center hole and the outer ring part below the annular groove The inner peripheral surface is embedded into the annular groove, and an annular sealing groove is opened on the inner peripheral surface of the outer ring part below the annular groove, and an O-ring retaining ring and a metal bottle mouth valve seat lining are installed in the annular sealing groove O-ring, the inner lining of the metal bottle mouth valve seat. The O-ring is in contact with the surface of the plastic lining through the O-ring back-up ring.

The plastic liner and the metal bottle mouth valve seat constitute the gas cylinder liner, and the fiber-reinforced resin-based composite material is wound outside the gas cylinder liner to form a fiber-reinforced layer.

The lower end of the bottle mouth valve or the upper end of the metal bottle mouth valve seat is provided with an O-ring groove, and the O-ring groove of the bottle mouth valve is located in the O-ring groove to play a sealing role.

The outer part of the upper end of the plastic lining extends and wraps around the outer peripheral surface of the lower end of the metal bottle mouth valve seat, so that the upper end of the plastic inner lining is entirely wrapped around 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, and the bottom of the annular groove is provided with a plurality of through holes arranged at intervals in the circumferential direction, and the outer part of the upper end of the plastic lining extends through the metal bottle mouth valve. The outer peripheral surface of the lower end of the seat is filled with the annular groove and the through hole in the annular groove to realize interfitting.

The material used for the fiber reinforced layer is carbon fiber, boron fiber, Kevlar fiber, glass fiber and the like.

The metal bottle mouth valve seat is made of aluminum alloy or other stainless steel or high-strength steel, and the inner lining of the metal bottle mouth valve seat is made of stainless steel.

The plastic inner lining is a high molecular polymer material such as nylon 6, nylon 66, polypropylene, HDPE, LDPE, etc.

The O-ring of the bottle mouth valve and the O-ring lining of the metal bottle mouth valve seat are hydrogen-resistant sealing materials such as nitrile rubber, silicon rubber and polytetrafluoroethylene.

The materials of the gasket and the flat gasket are non-metals such as rubber, polytetrafluoroethylene, PA, etc., or metal materials such as pure aluminum and pure copper.

The beneficial effect that the utility model has is:

1. The utility model adopts a multi-stage sealing structure of high-pressure gas cylinders, which makes the sealing of high-pressure gas cylinders more reliable.

Regardless of which path the high-pressure gas leaks from, there are multiple sealing surface structures to prevent leakage: the first-stage seal adopts a reliable and mature O-ring seal; the second-stage seal is a gasket seal on the end face of the metal bottle mouth valve seat.

2. The utility model adopts a self-tightening sealing structure, and an O-ring is used between the contact surface of the plastic lining and the metal bottle mouth valve seat to realize the initial sealing. With the increase of the internal pressure of the gas cylinder, the force of the gas pressure on the plastic lining The larger the pressure, the tighter the pressure between the plastic lining and the metal bottle mouth valve seat, and the more difficult it is for the gas to leak through the gap between the plastic lining and the metal bottle mouth valve seat.

Description of drawings

Fig. 1 is a sectional view of the sealing structure of the utility model.

In the figure: 1. Bottle mouth valve, 2. Gasket, 3. Metal bottle mouth valve seat, 4. Metal bottle mouth valve seat lining, 5. Bottle mouth valve O-ring, 6. O-ring retaining ring, 7 , Metal bottle mouth valve seat lining O-ring, 8, fiber reinforced layer, 9, plastic lining, 10, flat gasket, 11, through hole.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figure 1, the structure includes the metal bottle mouth valve seat 3, the metal bottle mouth valve seat lining 4, the bottle mouth valve O-ring 5, the bottle mouth valve 1, the gasket 2 and the fiber reinforced layer on the outside of the plastic lining 9 8.

The bottleneck end of the high-pressure gas cylinder is processed as a plastic lining 9, and is no longer made of metal materials. The upper end of the plastic lining 9 and the metal bottle mouth valve seat 3 are pasted together by rotational molding, the metal bottle mouth valve seat 3 is provided with a central hole, and the metal bottle mouth valve seat lining 4 is installed in the center hole, and the bottle mouth valve 1 is set in the The upper end of the central through hole of the metal bottle mouth valve seat lining 4 is connected by thread; the bottle mouth valve O-ring 5 is arranged between the inner peripheral surface of the metal bottle mouth valve seat lining 4 and the outer peripheral surface of the bottle mouth valve 1 Sealing is performed by pressing against the inner wall of the metal bottle mouth valve seat liner 4 and maintaining a continuous pressing force to play a sealing role. There is also a gasket 2 between the lower end surface of the bottle mouth valve 1 and the upper end surface of the metal gas cylinder valve seat 3; when the bottle mouth valve is tightened, the gasket is compressed to play a sealing role; the inner side of the upper end of the plastic lining 9 The part extends to the center of the center hole of the metal bottle mouth valve seat 3 and is embedded and connected to the groove opened at the bottom end of the metal bottle mouth valve seat liner 4 through the inner peripheral surface of the lower end of the center hole of the metal bottle mouth valve seat 3 and tightly fitted. The outer part 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. During injection molding or rotational molding, the plastic fills the groove on the lower end outer edge of the metal bottle mouth valve seat 3 to achieve mutual fitting . In specific implementation, the sealing structures at the upper and lower ends of the high-pressure gas cylinder are the same.

The metal bottle mouth valve seat lining 4 is mainly composed of 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 both flush with the upper end surface of the metal bottle mouth valve seat 3. A step is set in the center hole of the metal bottle mouth valve seat 3, the step faces outward, the metal bottle mouth valve seat liner 4 is placed in the center hole of the metal bottle mouth valve seat 3 and the bottom surface of the outer ring part is supported by a flat gasket 10 Connected to the step surface of the center hole of the metal bottle mouth valve seat 3; the bottom surface of the inner ring part is higher than the bottom surface of the outer ring part to form a lining step, and the outer edge of the bottom surface of the inner ring part of the metal bottle mouth valve seat lining 4 is opened An annular groove, that is, an annular groove is provided on the outer edge of the lining step, so that the metal bottle mouth valve seat lining 4 forms a "Л" shape as a whole, and the upper end of the plastic lining 9 will be buckled in the "Л" shaped opening. The inner part of the upper end of the plastic lining 9 extends toward the center of the center hole of the metal bottle mouth valve seat 3 and passes through the inner peripheral surface of the lower end of the central hole of the metal bottle mouth valve seat 3 and the inner peripheral surface of the outer ring part below the annular groove, and then is embedded into the ring. In the groove, an annular sealing groove is provided on the inner peripheral surface of the outer ring part below the annular groove, and an O-ring retaining ring 6, a metal bottle mouth valve seat lined with an O-ring 7, and a metal sealing groove are installed in the annular sealing groove. The O-ring 7 of the inner lining of the valve seat of the bottle mouth is in contact with the surface of the plastic lining 9 through the O-ring back-up ring 6 to form an initial seal. If the initial seal cannot be formed, the channel will continue to leak air, making a self-tight seal impossible.

Simultaneously, after the lower end of the bottle mouth valve 1 is fully loaded into the metal bottle mouth valve seat liner 4, the upper end of the plastic liner 9 is embedded in the annular groove of the metal bottle mouth valve seat liner 4, and the upper end of the plastic liner 9 is also blocked. Radial compression achieves better sealing in the annular groove of the metal bottle mouth valve seat liner 4 . In this way, the inner peripheral surface of the lower end of the metal bottle mouth valve seat lining 4 and the upper end outer peripheral surface of the plastic inner lining 9 are bonded together by the O-ring 7 of the metal bottle mouth valve seat lining to realize sealing.

The plastic liner 9 and the metal bottle mouth valve seat 3 constitute the gas cylinder liner, and the fiber-reinforced resin-based composite material is wound outside the gas cylinder liner to form the fiber-reinforced layer 8 .

The lower end of the bottle mouth valve 1 or the upper end of the metal bottle mouth valve seat 3 are provided with multiple O-ring grooves. 3 tightly sealed.

The center of the metal bottle mouth valve seat lining 4 has a through hole, and the upper end of the metal bottle mouth valve seat lining 4 through hole is a section of cylindrical internal thread, and the cylindrical thread is used to be threadedly connected with the external thread of the bottle mouth valve 1.

The outer part of the upper end of the plastic liner 9 extends and wraps around the outer peripheral surface of the lower end of the metal bottle mouth valve seat 3, so that the upper end of the plastic inner liner 9 is integrally wrapped around the lower end of the metal bottle mouth 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, and the bottom of the annular groove is provided with a plurality of through holes 11 arranged at intervals in the circumferential direction, and the outer part of the upper end of the plastic lining 9 extends through the metal bottle mouth valve. The outer peripheral surface of the lower end of the seat 3 is filled with the annular groove and the through hole 11 in the annular groove to realize interfitting. This structure is specifically prepared by injection molding or rotational molding. During injection molding or rotational molding, the 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 fills the annular groove entering the lower end of the metal bottle mouth valve seat 3. , and then enter the through hole 11 to achieve mutual fitting.

The principle process of the utility model compression sealing is:

The utility model forms a secondary seal of a leakage flow path through the bottle mouth valve O-ring 5 and the gasket 2 between the metal bottle mouth valve seat 3 and the bottle mouth valve 1; the other leakage flow path passes through the inner O-ring 7. The flat gasket 10 forms a secondary seal; the bonding force of the contact surface between the plastic liner 9 and the annular groove increases synchronously with the increase in the internal pressure of the gas cylinder, thus forming a self-tight seal, that is, the inner working of the gas cylinder The higher the pressure, the more reliable the seal.

No matter which path the gas in the high-pressure gas cylinder leaks from, it needs to pass through two or more multi-stage sealing surface structures.

As a result, the high-pressure gas in the gas cylinder cannot leak out, and an effective multi-stage seal is realized.

In this way, the sealing structure of the high-pressure gas cylinder of the utility model is provided with the double protection of the sealing of the metal gas cylinder valve seat and the bottle mouth valve through the O-ring seal and the gasket seal. Increased self-tightening sealing performance and elastic compression ring compression double protection, reliable sealing.

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.

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