Bottle opening sealing structure of vehicle hydrogen storage bottle

Abstract

The utility model relates to a vehicle hydrogen storage bottle opening sealing structure, which comprises a plastic inner container, a bottle valve seat, a joint and a locking nut, the bottle valve seat is positioned at the bottle opening of the plastic inner container, the joint is tightly connected in 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 joint 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 utility model relates to the technical field of high-pressure hydrogen storage sealing, in particular to a sealing structure for the bottle mouth of a vehicle-mounted hydrogen storage cylinder. Background Art

[0002] Hydrogen energy is a clean energy source. During the utilization of 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 produced. It 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, hydrogen energy is widely used in fields such as fuel cell vehicles, energy storage systems, and industrial production, and is one of the important components of future energy transformation.

[0003] In recent years, vehicle-mounted hydrogen storage cylinders have received extensive attention. Among them, type-IV hydrogen storage cylinders have become a research hotspot due to many advantages such as safety, light weight, high hydrogen storage density, long service life, and environmental protection. The biggest difference between type-IV hydrogen storage cylinders and other types of hydrogen storage cylinders is that their inner liners are made of plastic and high-strength carbon fibers are wound on the outer surface. However, type-IV hydrogen storage cylinders face many technical problems. Among them, the sealing problem between the plastic inner liner and the bottle mouth is one of the main difficulties, mainly including poor sealing stability, complex structure of the bottle mouth metal parts, easy separation of the plastic inner liner and the bottle valve seat, etc. And the bottle valve seat is the key link connecting the plastic inner liner and the bottle valve, and is the key to preventing hydrogen leakage and ensuring use safety. Therefore, its sealing structure has become the research focus of those skilled in the art. 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 the bottle mouth of a vehicle-mounted hydrogen storage cylinder.

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

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

[0007] According to the above technical solution, preferably, the plastic inner liner and the bottle valve seat are integrally formed.

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

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

[0010] According to the above technical solution, preferably, an anti-rotation groove is provided below the shoulder of the bottle valve seat, and an anti-rotation structure adapted to the shape of the anti-rotation groove is provided at the mouth of the plastic inner liner.

[0011] According to the above technical solution, preferably, a bearing surface is provided above the joint, and the axial force is transmitted to the bearing surface by tightening the lock nut to press down the joint, and the sealing structure is squeezed to form a seal with the plastic inner liner.

[0012] According to the above technical solution, preferably, the sealing structure includes a sealing ring and a retaining ring.

[0013] According to the above technical solution, preferably, the lock nut is provided with a loading surface, and the loading surface presses down the joint by tightening the lock nut.

[0014] According to the above technical solution, preferably, anti-rotation planes are symmetrically provided on the outer side surface of the lock nut.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The on-vehicle type-IV hydrogen storage cylinder mouth sealing structure provided by the present utility model realizes sealing by squeezing a metal joint, a sealing ring and the mouth of a plastic inner liner. The plastic inner liner adopts an injection molding process, and the bottle valve seat is used as an embedded part, and its shoulder is wrapped inside the plastic inner liner to ensure the bonding force between the bottle valve seat and the plastic inner liner during the long-term operation of the gas cylinder and prevent separation. The structures of the bottle valve seat, the joint and the lock nut are simple and easy to process. The bottle valve seat is fixed by a fixing tooling, and the lock nut is tightened with a tooling wrench to achieve sealing, which is convenient for installation. 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 front view structural schematic diagram of the mouth of the plastic inner liner of the present utility model.

[0020] Figure 4 is the three-dimensional structural schematic diagram of the joint part of the present utility model.

[0021] Figure 5 is the three-dimensional structural schematic diagram of the lock nut part of the present utility model.

[0022] In the figure: 1. Lock nut; 2. Joint; 3. Bottle valve seat; 4. Plastic inner 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. Bearing surface; 23. Sealing surface; 24. Sealing groove;

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

[0026] 41. Outer wall of the bottle mouth; 42. Anti-rotation structure. Detailed implementation mode

[0027] In order to enable those skilled in the art of the present technology to better understand the technical solutions 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 making creative efforts shall fall within the scope of protection of the utility model.

[0028] 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 of the utility model.

[0029] 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.

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

[0031] Among them, the valve seat 3 includes a neck 36 and a shoulder 37. An external thread 31 is provided on the outer side of the neck 36 for threaded connection with the lock nut 1. An inward concave limiting groove 33 is provided at the junction of the neck 36 and the shoulder 37 of the valve seat 3 for the axial restraint of the CF winding layer 6 and to solve the problem of excessive fiber accumulation at the neck of the head section during winding. In addition, an anti-rotation groove 35 is provided below the shoulder 37 of the valve seat 3. A rotation prevention structure 42 matching the shape of the anti-rotation groove 35 is provided at the neck of the plastic inner liner 4 to increase the anti-torsion moment between the plastic inner liner 4 and the valve seat 3, resist the torque generated by the fiber tension on the inner liner of the gas cylinder during winding, and prevent relative rotation between the plastic inner liner 4 and the valve seat 3 during the winding process.

[0032] A bearing surface 22 is provided above the joint 2. By tightening the lock nut 1, the axial force is transmitted to the bearing surface 22 and the joint 2 is pressed down, squeezing the sealing structure 5 and the plastic inner liner 4 to form a seal. The joint 2 is provided with an internal thread a21 for threaded connection with the thread on the bottle mouth valve. The sealing structure 5 includes a sealing ring and a retaining ring. In this example, it is preferably to provide two sealing grooves 24 on the sealing 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 outer wall 41 of the neck of the plastic inner liner 4.

[0033] The lock nut 1 is provided with a loading surface 12. By tightening the lock nut 1, the loading surface 12 presses down the joint 2. The lock nut 1 is provided with an internal thread b13 for threaded connection with the external thread 31 on the valve seat 3. Anti-rotation planes 11 are symmetrically provided on the outer side surface of the lock nut 1 for the installation of tooling jigs to realize the installation and disassembly of the lock 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 additionally provided outside the neck 36 for fixing the bottle valve seat 3 when installing other metal parts. At the same time, a transition surface 34 is preferably provided above its shoulder 37. The transition surface 34 has two functions. One is that when the plastic inner liner 4 is injection-molded, the shoulder 37 of the bottle valve seat 3 is wrapped, which improves the bonding reliability between the bottle valve seat 3 and the plastic inner liner 4 during the working process of the gas cylinder. The other is to facilitate the molding of the plastic inner liner 4 and the bottle valve seat 3 during the injection molding process, reduce the injection molding process difficulty, and avoid the formation of a stepped platform, resulting in the phenomenon of fiber bridging during winding. In addition, a limiting ring groove 38 is provided inside the neck 36 for axial restraint of the mouth of the plastic inner liner 4. At the same time, an inverted groove 39 is provided inside the neck 36 to improve the bonding force between the mouth of the plastic inner liner 4 and the bottle valve seat 3 and limit the movement of the mouth of the bottle.

[0035] The utility model realizes sealing by extruding a metal joint, a sealing ring and the mouth of a plastic inner liner. The plastic inner liner adopts an injection molding process. The bottle valve seat is used as an embedded part, and its shoulder is wrapped inside the plastic inner liner to ensure the bonding force between the bottle valve seat and the plastic inner liner during the long-term working process of the gas cylinder and avoid separation. The structures of the bottle valve seat, the joint and the locking nut are simple and easy to process. The bottle valve seat is fixed by a fixing tooling, and the locking nut is tightened with a tooling wrench to achieve sealing, which is convenient for installation.

[0036] The above are only the preferred embodiments of the 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 utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the utility model.

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.

3. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 1, 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: A rotation-stop groove (35) is provided below the shoulder (37) of the bottle valve seat (3). A rotation-stop structure (42) having a shape matching that 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 1, characterized in that: A bearing surface (22) is provided above the joint (2), and the axial force is transmitted to the bearing surface (22) by tightening the locking nut (1) and pressing the joint (2) downward, thereby squeezing the sealing structure (5) and the plastic liner (4) to form a seal.

7. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 6, characterized in that: The sealing structure (5) comprises a sealing ring and a retaining ring.

8. A sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 6 or 7, 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).

9. The sealing structure for the mouth of a hydrogen storage bottle for a vehicle according to claim 8, 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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