Bottle opening sealing structure of vehicle hydrogen storage bottle

Abstract

The invention relates to a vehicle hydrogen storage bottle opening sealing structure which comprises a plastic inner container, a bottle valve seat, a connector and a locking nut, the bottle valve seat is located at a bottle opening of the plastic inner container, the connector is tightly connected into the bottle opening of the plastic inner container through a sealing structure, and the sealing structure and the plastic inner container are sealed by pressing the connector downwards through the locking nut and extruding the sealing structure. The metal connector, the sealing ring and the bottle opening of the plastic inner container are extruded to achieve sealing, the plastic inner container adopts the injection molding technology, the cylinder valve seat serves as an embedded part, the shoulder of the cylinder valve seat is wrapped in the plastic inner container, the binding force of the cylinder valve seat and the plastic inner container in the long-term working process of the gas cylinder is guaranteed, separation is avoided, and the service life of the gas cylinder is prolonged. The cylinder valve seat, the connector and the locking nut are simple in structure and easy to machine, the cylinder valve seat is fixed through the fixing tool, sealing can be achieved by screwing the locking nut through a tool wrench, and installation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure hydrogen storage sealing, and in particular to a sealing structure for a bottle mouth of a hydrogen storage gas cylinder for a vehicle. Background Art

[0002] Hydrogen energy is a clean energy. In the process of hydrogen energy utilization, hydrogen reacts with oxygen to produce water and release energy, while not producing greenhouse gases and harmful substances such as carbon dioxide. It has obvious advantages in improving air quality and saving energy and reducing emissions, so it is considered to be an environmentally friendly and renewable energy form. As a recognized clean energy, hydrogen energy is widely used in fuel cell vehicles, energy storage systems, industrial production and other fields, and is one of the important components of future energy transformation.

[0003] In recent years, on-vehicle hydrogen storage cylinders have received extensive attention. Among them, Type IV hydrogen storage cylinders have become a hot topic of current research due to their many advantages such as safety, light weight, high hydrogen storage density, long life, and environmental protection. The biggest difference between Type IV hydrogen storage bottles and other types of hydrogen storage bottles is that their inner liner is made of plastic and the outer surface is wrapped with high-strength carbon fiber. However, Type IV hydrogen storage cylinders face many technical difficulties, among which the sealing problem between the plastic liner and the bottle mouth is one of the main difficulties. The main problems are poor sealing stability, complex structure of the bottle mouth metal parts, and easy separation of the plastic liner and the bottle valve seat. The bottle valve seat is the key link connecting the plastic liner and the bottle valve, and is the key to preventing hydrogen leakage and ensuring safe use. Therefore, its sealing structure has become a research focus for technicians in this field. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a sealing structure for the mouth of a hydrogen storage cylinder for a vehicle.

[0005] The present invention is achieved through the following technical solutions:

[0006] A sealing structure for the mouth of a hydrogen storage cylinder for a vehicle comprises a plastic liner, a bottle valve seat, a joint and a locking nut. The bottle valve seat is located at the mouth of the plastic liner, and the joint is tightly connected to the mouth of the plastic liner through a sealing structure. The locking nut presses down the joint to squeeze the sealing structure and the plastic liner to form a seal.

[0007] According to the above technical solution, preferably, the plastic liner and the bottle valve seat are integrally formed by an injection molding process.

[0008] According to the above technical solution, preferably, the bottle valve seat includes a neck and a shoulder, and the outer side of the neck is provided with an external thread for threaded connection with the locking nut.

[0009] According to the above technical solution, preferably, a concave limiting groove is provided at the junction of the neck and the shoulder of the bottle valve seat.

[0010] According to the above technical solution, preferably, the upper part of the shoulder of the bottle valve seat is a transition surface, and the shoulder of the bottle valve seat is wrapped during the injection molding of the plastic inner liner; a stop groove is provided below the shoulder of the bottle valve seat, and a stop structure matching the shape of the stop groove is provided at the bottle mouth of the plastic inner liner.

[0011] According to the above technical solution, preferably, a limiting groove and an inverted groove are respectively provided on the inner side of the neck of the bottle valve seat.

[0012] According to the above technical solution, preferably, the joint includes a bearing surface and a joint bevel, and the axial force is transmitted to the bearing surface and the joint is pressed down by tightening the locking nut. A sealing bevel is arranged in the bottle mouth of the plastic liner, and the joint bevel is adapted to the sealing bevel and is tightly connected through the sealing structure.

[0013] According to the above technical solution, preferably, the sealing structure includes a sealing ring and a retaining ring.

[0014] According to the above technical solution, preferably, the locking nut is provided with a loading surface, and the loading surface presses the joint downward by tightening the locking nut, and the outer side surface of the locking nut is symmetrically provided with anti-rotation planes.

[0015] The beneficial effects of the present invention are:

[0016] The vehicle-mounted IV type hydrogen storage cylinder mouth sealing structure provided by the present invention adopts a metal joint, a sealing ring and a plastic liner to squeeze at the bottle mouth to achieve sealing. The plastic liner adopts the injection molding process, and the bottle valve seat is used as an embedded part, and its shoulder is wrapped inside the plastic liner to ensure the bonding force between the bottle valve seat and the plastic liner during the long-term operation of the gas cylinder to avoid separation. The bottle valve seat, joint, and locking nut have a simple structure and are easy to process. The bottle valve seat is fixed by a fixing tool, and the sealing can be achieved by tightening the locking nut with a tool wrench, which is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main structural schematic diagram of the present invention.

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

[0019] Figure 3 It is a schematic diagram of the main structure of the mouth of the plastic liner of the present invention.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the joint part of the present invention.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the locking nut part of the present invention.

[0022] In the figure: 1. Locking nut; 2. Connector; 3. Bottle valve seat; 4. Plastic liner; 5. Sealing structure; 6. CF winding layer; 7. GF protective layer;

[0023] 11. anti-rotation plane; 12. loading surface; 13. internal thread b;

[0024] 21. Internal thread a; 22. Load-bearing surface; 23. Joint bevel; 24. Sealing groove;

[0025] 31. External thread; 32. Flat position; 33. Limiting groove; 34. Transition surface; 35. Anti-rotation groove; 36. Neck; 37. Shoulder; 38. Limiting ring groove; 39. Inverted groove;

[0026] 41. Sealing bevel; 42. Anti-rotation structure. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiment. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the invention.

[0028] In the description of the invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the invention.

[0029] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "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 a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1: As shown in the figure, the present invention can be used for the sealing structure 5 of the bottle mouth of the vehicle-mounted IV type hydrogen storage cylinder. The plastic liner 4 and the bottle valve seat 3 of this sealing structure 5 are integrally formed by the injection molding process. The joint 2 is squeezed by tightening the locking nut 1, and the sealing ring on the joint 2 is squeezed with the sealing surface of the bottle mouth of the plastic liner 4, thereby forming a seal of the overall structure. Specifically, it includes a plastic liner 4, a bottle valve seat 3, a joint 2 and a locking nut 1. The bottle valve seat 3 is located at the bottle mouth of the plastic liner 4. In this example, it is preferred but not limited to that the plastic liner 4 and the bottle valve seat 3 are integrally formed by the injection molding process, and a winding layer and a protective layer (CF winding layer 6 and GF protective layer 7) are provided outside the plastic liner 4. The joint 2 is tightly connected to the bottle mouth of the plastic liner 4 through the sealing structure 5, and the locking nut 1 presses down the joint 2 to squeeze the sealing structure 5 and the plastic liner 4 to form a seal.

[0031] The bottle valve seat 3 includes a neck 36 and a shoulder 37. The outer side of the neck 36 is provided with an external thread 31 for threaded connection with the locking nut 1. An inwardly concave limiting groove 33 is provided at the junction of the neck 36 and the shoulder 37 of the bottle valve seat 3, which is used to constrain the CF winding layer 6 axially and solve the problem of excessive fiber accumulation at the bottle mouth of the head section during winding. In addition, a rotation-stopping groove 35 is provided below the shoulder 37 of the bottle valve seat 3. In this example, the rotation-stopping groove 35 can also be replaced by a rotation-stopping hole. The bottle mouth of the plastic liner 4 is provided with a rotation-stopping structure 42 that matches the shape of the rotation-stopping groove 35, which is used to increase the anti-torsion moment between the plastic liner 4 and the bottle valve seat 3, resist the torque generated by the fiber tension on the cylinder liner during winding, and prevent the plastic liner 4 and the bottle valve seat 3 from rotating relative to each other during the winding process.

[0032] The joint 2 includes a bearing surface 22 and a joint 2 inclined surface. The joint 2 is provided with an internal thread a21 for connecting with the thread on the bottle mouth valve. By tightening the locking nut 1, the axial force is transmitted to the bearing surface 22 and the joint 2 is pressed down. A sealing inclined surface 41 is provided in the bottle mouth of the plastic liner 4. The joint 2 inclined surface is adapted to the sealing inclined surface 41 and is tightly connected through the sealing structure 5. The sealing structure 5 includes a sealing ring and a retaining ring. In this example, two sealing grooves 24 are preferably provided on the joint inclined surface 23 of the side wall of the joint 2 for installing the sealing ring and the retaining ring, and forming a seal with the sealing inclined surface 41 at the bottle mouth of the plastic liner 4.

[0033] The locking nut 1 is provided with a loading surface 12, and the loading surface 12 is pressed down on the connector 2 by tightening the locking nut 1. The locking nut 1 is provided with an internal thread b13 for connecting with an external thread 31 on the bottle valve seat 3. The outer side surface of the locking nut 1 is symmetrically provided with a rotation-stopping plane 11 for installation of a fixture to realize installation and removal of the locking nut 1.

[0034] Embodiment 2: Based on the above embodiment 1, preferably, in the design of the bottle valve seat 3, a flat position 32 can be added on the outside of the neck 36 to fix the bottle valve seat 3 when installing the remaining metal parts. At the same time, a transition surface 34 is preferably added above its shoulder 37. The transition surface 34 has two functions. One is to wrap the shoulder 37 of the bottle valve seat 3 during the injection molding of the plastic liner 4, thereby improving the reliability of the combination of the bottle valve seat 3 and the plastic liner 4 during the operation of the gas cylinder. The second is to facilitate the molding of the plastic liner 4 and the bottle valve seat 3 during the injection molding process, reduce the difficulty of the injection molding process, avoid the formation of a step platform, and cause the phenomenon of fiber overhead during winding. In addition, a limited annular groove 38 is provided on the inside of the neck 36, and the structure can be replaced with a boss form, which is used for axial constraint of the bottle mouth of the plastic liner 4. At the same time, an inverted groove 39 is provided on the inside of the neck 36 to improve the bonding force between the bottle mouth of the plastic liner 4 and the bottle valve seat 3 and limit the movement of the bottle mouth.

[0035] The present invention uses a metal joint, a sealing ring and a plastic liner to extrude at the bottle mouth to achieve sealing. The plastic liner is made by injection molding, and the bottle valve seat is used as an embedded part, and its shoulder is wrapped inside the plastic liner to ensure the bonding force between the bottle valve seat and the plastic liner during long-term operation of the gas cylinder to avoid separation. The bottle valve seat, joint, and locking nut have a simple structure and are easy to process. The bottle valve seat is fixed by a fixing tool, and the sealing can be achieved by tightening the locking nut with a tool wrench, which is convenient to install.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sealing structure for the mouth of a hydrogen storage bottle for a vehicle, characterized in that: It comprises a plastic liner (4), a bottle valve seat (3), a joint (2) and a locking nut (1). The bottle valve seat (3) is located at the bottle mouth of the plastic liner (4), and the joint (2) is tightly connected to the bottle mouth of the plastic liner (4) through a sealing structure (5). The joint (2) is pressed down by the locking nut (1), thereby squeezing the sealing structure (5) and the plastic liner (4) to form a seal.

2. According to claim 1, a sealing structure for the mouth of a hydrogen storage bottle for a vehicle is characterized in that: The plastic liner (4) and the bottle valve seat (3) are integrally formed by an injection molding process.

3. According to claim 2, a sealing structure for the mouth of a hydrogen storage bottle for a vehicle is characterized in that: The bottle valve seat (3) comprises a neck (36) and a shoulder (37), and the neck (36) is provided with an external thread (31) on the outside for being threadedly connected with the locking nut (1).

4. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 3, characterized in that: A concave limiting groove (33) is provided at the junction of the neck (36) and the shoulder (37) of the bottle valve seat (3).

5. A sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 3 or 4, characterized in that: The upper portion of the shoulder (37) of the bottle valve seat (3) is a transition surface (34), and the shoulder (37) of the bottle valve seat (3) is wrapped by the plastic liner (4) during injection molding; A rotation-stop groove (35) is provided below the shoulder (37) of the bottle valve seat (3), and a rotation-stop structure matching the shape of the rotation-stop groove (35) is provided at the bottle mouth of the plastic liner (4).

6. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 5, characterized in that: A limiting groove (33) and an inverted groove (39) are respectively arranged on the inner side of the neck (36) of the bottle valve seat (3).

7. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 1, characterized in that: The joint (2) comprises a bearing surface (22) and a joint (2) inclined surface. By tightening the locking nut (1), the axial force is transmitted to the bearing surface (22) and the joint (2) is pressed downward. A sealing bevel (41) is provided in the bottle mouth of the plastic liner (4), and the bevel of the joint (2) is matched with the sealing bevel (41) and is tightly connected via the sealing structure (5).

8. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 7, characterized in that: The sealing structure (5) comprises a sealing ring and a retaining ring.

9. A sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 7 or 8, characterized in that: The locking nut (1) is provided with a loading surface (12), and the loading surface (12) is pressed downwardly against the joint (2) by tightening the locking nut (1).

10. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 9, characterized in that: The outer side surface of the locking nut (1) is symmetrically provided with a rotation-stopping plane (11).

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