High-pressure hydrogen storage cylinder sealing structure capable of achieving multiple sealing

Abstract

The utility model relates to a high-pressure hydrogen storage cylinder sealing structure capable of realizing multiple sealing, which comprises a plastic inner container, a cylinder valve seat and a locking nut, the cylinder valve seat is positioned at the opening of the plastic inner container, and the locking nut is in threaded connection with the cylinder valve seat, so that extrusion sealing is formed among the locking nut, the plastic inner container and the cylinder valve seat. The sealing structure is simple in structure and convenient to install, the multi-sealing effect can be achieved by screwing down the locking nut, the air tightness of connection between the plastic inner container and the metal valve seat can be guaranteed, the failure probability is reduced, and the sealing reliability is improved; by arranging the structure with the rotation stopping function and adopting the structure that the plastic inner container wraps the shoulder of the cylinder valve seat, the combination effect of the plastic inner container and the cylinder valve seat is promoted, the connection strength and the overall stability of the structure can be improved, it is guaranteed that the plastic inner container and the cylinder valve seat cannot be separated under the long-term working state, and the service life of the cylinder valve seat is prolonged. Potential safety hazards caused by pressure rise after the hydrogen storage cylinder is inflated are avoided, and the service life and the safety of the hydrogen storage cylinder are effectively prolonged and improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure hydrogen storage sealing, in particular to a sealing structure for a high-pressure hydrogen storage cylinder that can achieve multiple seals. Background Art

[0002] Hydrogen energy is a clean energy source. In the process of utilizing hydrogen energy, hydrogen reacts with oxygen to produce water, releasing energy, and at the same time, no greenhouse gases and harmful substances such as carbon dioxide are generated, which has obvious advantages in improving air quality and energy conservation and emission reduction. Therefore, it is considered an environmentally friendly and renewable energy form. As a recognized clean energy source, hydrogen energy is widely used in fields such as fuel cell vehicles, energy storage systems, and industrial production, and is an important part of the future energy transformation.

[0003] In recent years, on-vehicle hydrogen storage cylinders have received wide attention. Among them, type-IV hydrogen storage cylinders have become a current research hotspot due to many advantages such as safety, light weight, high hydrogen storage density, long service life, and environmental friendliness. The biggest difference between type-IV hydrogen storage cylinders and other types of hydrogen storage cylinders is that the inner liner material is plastic and the outer surface is wound with high-strength carbon fiber. However, type-IV hydrogen storage cylinders face many technical problems. The valve seat is a key link connecting the plastic inner liner and the valve. Currently, the connection strength between the valve seat and the plastic inner liner is not high and is prone to separation. During the charging and discharging process of on-vehicle hydrogen storage cylinders, the internal pressure and temperature will continuously change. For high-pressure hydrogen storage cylinders, the connection between the plastic inner liner and the valve seat is prone to fatigue during repeated high and low temperature changes and expansion and contraction processes, which can lead to the failure of the sealing structure and hydrogen leakage, posing a safety hazard to the use of the cylinder. Therefore, further improvement is needed. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a sealing structure for a high-pressure hydrogen storage cylinder that can achieve multiple seals.

[0005] The utility model is realized by the following technical solutions:

[0006] A sealing structure for a high-pressure hydrogen storage cylinder that can achieve multiple seals, including a plastic inner liner, a valve seat, and a lock nut. The valve seat is located at the mouth of the plastic inner liner, and the lock nut is threadedly connected to the valve seat, so as to form a compression seal among the lock nut, the plastic inner liner, and the valve seat.

[0007] According to the above technical solution, preferably, the plastic inner liner and the valve seat are integrally formed by an injection molding process, so that the valve seat is wrapped at the mouth of the plastic inner liner.

[0008] According to the above technical solution, preferably, the lock nut is threadedly connected to the valve seat and tightly abuts against the outer surface of the plastic inner liner.

[0009] According to the above technical solution, preferably, a sealing plane is provided at the top of the plastic inner liner, the locking nut is tightly connected to the plastic inner liner at the sealing plane, and a sealing ring is provided between the locking nut and the plastic inner liner.

[0010] According to the above technical solution, preferably, the bottle valve seat includes a neck and a shoulder, and an external thread is provided on the neck of the bottle valve seat for threaded connection with the locking nut.

[0011] According to the above technical solution, preferably, an axial limiting groove is provided at the junction of the neck and the shoulder of the bottle valve seat.

[0012] According to the above technical solution, preferably, the shoulder of the bottle valve seat is provided with one or more of an anti-rotation hole, an anti-rotation surface or an anti-rotation groove, which is adapted to the anti-rotation structure at the mouth of the plastic inner liner.

[0013] According to the above technical solution, preferably, the anti-rotation hole or the anti-rotation groove is located on the surface of the shoulder of the bottle valve seat, and the anti-rotation surface is located on the side of the shoulder of the bottle valve seat, so that the vertical projection of the shoulder of the bottle valve seat is a polygonal structure or a non-circular structure.

[0014] The beneficial effects of the present utility model are:

[0015] The structure of the present utility model is simple and convenient to install. By using a bottle valve seat and a locking nut, the effect of multiple seals can be achieved by tightening the locking nut, which can ensure the airtightness of the connection between the plastic inner liner and the metal valve seat, reduce the failure probability, and improve the sealing reliability;

[0016] By setting a structure with an anti-rotation function and adopting a structure in which the shoulder of the bottle valve seat is enveloped by the plastic inner liner, the bonding effect between the plastic inner liner and the bottle valve seat is promoted, the connection strength and the overall structural stability can be improved, and it can be ensured that the plastic inner liner and the bottle valve seat will not be separated under the long-term working condition, avoiding the safety hazards caused by the increase in pressure after the hydrogen storage cylinder is filled with gas, and effectively improving the service life and safety of the hydrogen storage cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view structural schematic diagram of the present utility model.

[0018] Figure 2 is the three-dimensional structural schematic diagram of the bottle valve seat part of the present utility model.

[0019] Figure 3 is the three-dimensional structural schematic diagram of the locking nut part of the present utility model.

[0020] Figure 4 is the three-dimensional structural schematic diagram of the position of the mouth of the plastic inner liner of the present utility model.

[0021] In the figure: 1. Bottle valve seat; 2. Locking nut; 3. Sealing ring; 4. Plastic inner liner; 5. Carbon fiber winding layer;

[0022] 11. Hexagon prism; 12. Internal thread a; 13. External thread; 14. Axial limiting groove; 15. Anti-rotation surface; 16. Anti-rotation hole; 17. Shoulder; 18. Neck; 19. Inner liner limiting groove;

[0023] 21. Internal thread b; 22. Fixed plane; 23. Limiting ring groove; 24. Sealing ring groove;

[0024] 41. Anti-rotation structure; 42. Sealing plane. Specific embodiments

[0025] In order to enable those skilled in the art of the present technology to better understand the technical solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and the best embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the utility model.

[0026] In the description of the utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the utility model.

[0027] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] As shown in the figure, the present utility model includes a plastic inner liner 4, a bottle valve seat 1, and a locking nut 2. The bottle valve seat 1 is located at the mouth of the plastic inner liner 4. In this example, the plastic inner liner 4 and the bottle valve seat 1 are integrally formed by an injection molding process, so that the bottle valve seat 1 is wrapped at the mouth of the plastic inner liner 4. A carbon fiber winding layer 5 is processed outside the plastic inner liner 4 and the bottle valve seat 1. At the same time, the locking nut 2 is threadedly connected to the bottle valve seat 1, so as to form a compression seal among the locking nut 2, the plastic inner liner 4, and the bottle valve seat 1.

[0029] The internal thread b21 of the locking nut 2 is used to connect with the external thread 13 on the bottle valve seat 1, and is tightly abutted against the outer surface of the plastic liner 4. Specifically, a sealing plane 42 is provided on the top of the plastic liner 4, and the locking nut 2 is tightly connected to the plastic liner 4 at the sealing plane 42, and a sealing ring 3 is provided between the locking nut 2 and the plastic liner 4. In this example, a sealing ring groove 24 is provided on the bottom surface of the locking nut 2, and the sealing ring 3 is placed in the sealing ring groove 24.

[0030] The bottle valve seat 1 includes a neck 18 and a shoulder 17. The neck 18 of the bottle valve seat 1 is provided with an external thread 13 for threaded connection with the locking nut 2. The neck 18 of the bottle valve seat 1 is also provided with an internal thread a12 for threaded connection with the bottle mouth valve. At the same time, an axial limiting groove 14 is provided at the junction of the neck 18 and the shoulder 17 of the bottle valve seat 1. In addition, in this example, an inner liner limiting groove 19 can be added to the bottom surface of the shoulder 17 of the bottle valve seat 1 for limiting the position of the plastic inner liner 4 during injection molding.

[0031] The shoulder 17 of the bottle valve seat 1 is provided with one or more of a stop hole 16, a stop surface 15 or a stop groove, which is adapted to the stop structure 41 at the bottle mouth of the plastic liner 4 during injection molding. Specifically, in this example, the stop hole 16 or the stop groove is located on the surface of the shoulder 17 of the bottle valve seat 1, and the stop surface 15 is located on the side of the shoulder 17 of the bottle valve seat 1, so that the vertical projection of the shoulder 17 of the bottle valve seat 1 is a polygonal structure or a non-circular structure. This setting allows the plastic liner 4 and the bottle valve seat 1 to be better combined together during integral injection molding, and will not separate during long-term operation, thereby improving the connection stability between the plastic liner 4 and the bottle valve seat 1 and enhancing the anti-torsion torque between the plastic liner 4 and the bottle valve seat 1.

[0032] In addition, a limiting annular groove 23 may be provided around the outer side of the locking nut 2 to limit the axial position of the carbon fiber winding layer 5 and prevent excessive fiber accumulation in the head section. A prism structure (preferably a hexagonal prism 11 structure in this example) may be provided at the opening of the neck 18 of the bottle valve seat 1, and the bottle valve seat 1 may be fixed during installation by using an installation tool and the hexagonal prism 11. A fixing plane 22 is provided around the outer surface of the locking nut 2 to cooperate with the tool to install and remove the locking nut 2.

[0033] In the present utility model, through an injection molding process, the plastic inner liner and the bottle valve seat are integrally formed. By tightening the lock nut to squeeze the edge of the mouth of the plastic inner liner, a multi-layer sealing structure is formed. The specific principle is as follows: The first layer of sealing is formed by the mouth of the plastic inner liner and the lower surface of the shoulder of the bottle valve seat. When the gas cylinder is working, the internal air pressure promotes a self-sealing between the plastic inner liner and the bottle valve seat. As the internal pressure of the gas cylinder gradually increases, the pressure between the inner liner and the lower surface of the shoulder of the bottle valve seat also gradually increases, and the sealing effect between the plastic inner liner and the bottle valve seat becomes better and better. The second layer of sealing is formed by the plastic inner liner and the upper surface of the shoulder of the bottle valve seat. By tightening the lock nut, the extrusion force is increased, promoting the formation of an extrusion seal between the mouth of the plastic inner liner and the upper surface of the shoulder of the bottle valve seat. The third layer of sealing is formed by the sealing ring. A sealing ring groove is provided on the lower surface of the lock nut for installing the sealing ring. By tightening the lock nut, the extrusion force is increased to squeeze the sealing ring, realizing the seal between the sealing ring and the plastic inner liner.

[0034] The structure of the present utility model is simple and convenient to install. By using the bottle valve seat and the lock nut, the effect of multi-layer sealing can be achieved by tightening the lock nut, which can ensure the airtightness of the connection between the plastic inner liner and the metal valve seat, reduce the failure probability, and improve the sealing reliability. By setting a structure with an anti-rotation function and adopting a structure in which the plastic inner liner envelopes the shoulder of the bottle valve seat, the bonding effect between the plastic inner liner and the bottle valve seat is promoted, the connection strength and the overall structural stability can be improved, ensuring that the plastic inner liner and the bottle valve seat will not be separated under long-term working conditions, avoiding potential safety hazards caused by the increase in pressure after the hydrogen storage cylinder is filled with gas, and effectively improving the service life and safety of the hydrogen storage cylinder.

[0035] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals, characterized in that: It includes a plastic liner (4), a bottle valve seat (1), and a locking nut (2). The bottle valve seat (1) is located at the bottle mouth of the plastic liner (4), and the locking nut (2) is threadedly connected to the bottle valve seat (1), so that an extrusion seal is formed between the locking nut (2), the plastic liner (4) and the bottle valve seat (1).

2. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to claim 1, characterized in that: The plastic liner (4) and the bottle valve seat (1) are integrally formed, so that the bottle valve seat (1) is wrapped around the bottle mouth of the plastic liner (4).

3. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to claim 2, characterized in that: The locking nut (2) is threadedly connected to the bottle valve seat (1) and is tightly abutted against the outer surface of the plastic liner (4).

4. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to claim 3, characterized in that: A sealing plane (42) is provided on the top of the plastic liner (4), the locking nut (2) and the plastic liner (4) are tightly connected at the sealing plane (42), and a sealing ring (3) is provided between the locking nut (2) and the plastic liner (4).

5. The sealing structure of a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to any one of claims 1 to 4, characterized in that: The bottle valve seat (1) comprises a neck (18) and a shoulder (17). The neck (18) of the bottle valve seat (1) is provided with an external thread (13) for being threadedly connected with the locking nut (2).

6. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to claim 5, characterized in that: An axial limiting groove (14) is provided at the junction of the neck (18) and the shoulder (17) of the bottle valve seat (1).

7. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to claim 5, characterized in that: The shoulder (17) of the bottle valve seat (1) is provided with one or more of a rotation-stopping hole (16), a rotation-stopping surface (15) or a rotation-stopping groove, which is compatible with the rotation-stopping structure (41) at the bottle mouth of the plastic liner (4).

8. A sealing structure for a high-pressure hydrogen storage cylinder capable of achieving multiple seals according to claim 7, characterized in that: The anti-rotation hole (16) or the anti-rotation groove is located on the surface of the shoulder (17) of the bottle valve seat (1), and the anti-rotation surface (15) is located on the side of the shoulder (17) of the bottle valve seat (1).

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