Bottle opening sealing structure of gas storage bottle

Abstract

The utility model discloses a bottle opening sealing structure of a gas storage bottle. The sealing device comprises a gas storage bottle opening (5) and a bottle opening sealing piece, the bottle opening sealing piece is provided with a center rod (4) and an end cover (2) located above the center rod (4), and an annular sealing ring (6) is arranged between the end cover (2) and the gas storage bottle opening (5). An annular sealing groove is formed in the lower portion of the end cover (2), the annular sealing ring (6) is located between the annular sealing groove and the upper end face of the gas storage bottle opening (5), and the annular sealing ring (6) is an O-shaped sealing ring. A protection ring (3) is arranged downwards from the end cover (2), and the inner side wall of the protection ring (3) is located outside the outer side wall of the gas storage bottle opening (5). And scale marks (10) are arranged on the outer side wall of the gas storage bottle opening (5). The hydrogen storage cylinder is mainly used for storing hydrogen.

Description

Technical Field

[0001] The utility model relates to the technical field of gas cylinder sealing, and particularly to a bottle mouth sealing structure of a gas cylinder. Background Art

[0002] As an excellent energy carrier, hydrogen has advantages such as high efficiency and cleanness. The key technologies for hydrogen energy utilization include hydrogen production, storage and transportation, and application. Among them, hydrogen storage is a key link in the hydrogen energy industry chain. The hydrogen transported and stored is mainly high-pressure gaseous hydrogen, and a hydrogen storage cylinder is a commonly used high-pressure gaseous hydrogen storage device. The pressure of high-pressure gaseous hydrogen is relatively high, usually reaching 70 MPa, and it has very high requirements for the reliability of the bottle mouth sealing structure of the hydrogen storage cylinder.

[0003] Chinese Patent CN218523408U discloses a bottle mouth sealing structure of a high-pressure gas cylinder, which includes a bottle mouth valve seat with a central hole and a plastic inner liner. The top of the plastic inner liner wraps the lower end part of the bottle mouth valve seat. A hollow bottle mouth valve seat inner liner is arranged in the central hole of the bottle mouth valve seat. The bottle mouth valve seat inner liner is in threaded cooperation with the bottle mouth valve seat and abuts against the part of the plastic inner liner extending into the central hole. A bottle mouth valve is sleeved on the upper end part of the bottle mouth valve seat. The bottle mouth valve includes a valve core and a rotating part arranged on the top of the valve core. The valve core is in threaded cooperation with the bottle mouth valve seat. An annular groove is arranged on the upper end surface of the bottle mouth valve seat, and a gasket is arranged in the annular groove. After the bottle mouth valve is installed in place, the rotating part of the bottle mouth valve squeezes the gasket to form the first seal. An O-ring groove is arranged on the lower end part of the valve core, and multiple O-rings are sleeved in the O-ring groove. The bottle mouth valve is in cooperation with the bottle mouth valve seat through the O-rings to form the second seal.

[0004] The main problems existing in the above bottle mouth sealing structure of the high-pressure gas cylinder are as follows: the gasket in the annular groove on the upper end surface of the bottle mouth valve seat is a circumferential sealing gasket and cannot achieve self-tightening sealing. Moreover, this circumferential sealing gasket is not protected and is easily corroded by the medium outside the gas cylinder (such as rainwater). Therefore, there is a risk of gas leakage from the circumferential sealing gasket in the gas cylinder. Summary of the Invention

[0005] The purpose of the utility model is to provide a bottle mouth sealing structure of a gas cylinder to solve the following problems of the existing bottle mouth sealing structure of a gas cylinder: there is a risk of gas leakage from the circumferential sealing gasket in the gas cylinder.

[0006] To solve the above problems, the technical solution adopted by the present utility model is as follows: A bottle mouth sealing structure for a gas storage cylinder, comprising a gas storage cylinder bottle mouth and a bottle mouth sealing member. The bottle mouth sealing member is provided with a central rod and an end cap located above the central rod. A circumferential sealing ring is provided between the end cap and the gas storage cylinder bottle mouth. It is characterized in that: a circumferential sealing groove is provided at the lower part of the end cap, and the circumferential sealing ring is located between the circumferential sealing groove and the upper end surface of the gas storage cylinder bottle mouth. The circumferential sealing ring is an O-ring. A protective ring is provided downward from the end cap, and the inner side wall of the protective ring is located outside the outer side wall of the gas storage cylinder bottle mouth. A scale line is provided on the outer side wall of the gas storage cylinder bottle mouth.

[0007] Adopting the present utility model has the following beneficial effects: The circumferential sealing ring is an O-ring, and self-tightening circumferential sealing can be achieved through its own compression deformation. The scale line and the lower end surface of the protective ring are used in combination to accurately measure and control the compression deformation amount of the circumferential sealing ring, achieving ideal circumferential sealing. The protective ring can protect the circumferential sealing ring, making it not easily corroded by the medium outside the gas storage cylinder. Therefore, there is no risk of gas leakage from the circumferential sealing ring in the gas storage cylinder of the present utility model.

[0008] The present utility model is mainly used for gas storage cylinders storing hydrogen. Gas storage cylinders storing gases such as oxygen, nitrogen, and argon can also adopt the solution of the present utility model. The structure and processing of the present utility model are simple and it is easy to promote and use.

[0009] The following further elaborates on the present utility model in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings and specific embodiments do not limit the scope claimed by the present utility model. Description of the Drawings

[0010] Figure 1 is a schematic diagram of the first embodiment of the bottle mouth sealing structure of the gas storage cylinder of the present utility model.

[0011] Figure 2 is a schematic diagram of the second embodiment of the bottle mouth sealing structure of the gas storage cylinder of the present utility model.

[0012] Figure 1 and Figure 2 In, the same reference numerals represent the same technical features. The relevant technical features and reference numerals are as follows: connection structure 1; end cap 2; protective ring 3; central rod 4; gas storage cylinder bottle mouth 5; circumferential sealing ring 6; axial sealing ring 7; auxiliary installation hole 8; gas transmission hole 9; scale line 10; gas storage cylinder 11. Specific Embodiments

[0013] Figure 1The bottle mouth sealing structure of the gas storage cylinder of the present utility model (referred to as the sealing structure for short) includes the bottle mouth 5 of the gas storage cylinder and the bottle mouth seal. The bottle mouth seal is provided with a central rod 4 and an end cap 2 located above the central rod 4. The external thread section of the central rod 4 is matched with the internal thread section in the hole of the bottle mouth 5 of the gas storage cylinder. Below the external thread section and the internal thread section, an axial sealing groove is provided on the outer side of the central rod 4, and an axial sealing ring 7 is provided between the axial sealing groove and the hole wall of the bottle mouth 5 of the gas storage cylinder. The axial sealing ring 7 is an O-shaped sealing ring.

[0014] A circumferential sealing ring 6 is provided between the end cap 2 and the bottle mouth 5 of the gas storage cylinder. The gas storage cylinder 11 of the present utility model is a single-layer metal structure, and the bottle mouth 5 of the gas storage cylinder is the bottle mouth of the single-layer metal structure gas storage cylinder 11. A circumferential sealing groove is provided at the lower part of the end cap 2, and the circumferential sealing ring 6 is located between the circumferential sealing groove and the upper end face of the bottle mouth 5 of the gas storage cylinder. The circumferential sealing ring 6 is an O-shaped sealing ring. The materials of the circumferential sealing ring 6 and the axial sealing ring 7 are nitrile rubber, ethylene propylene diene monomer rubber or silicone rubber, etc., and can resist the corrosion of the gas in the gas storage cylinder 11.

[0015] A protective ring 3 is provided downward from the end cap 2, and the inner side wall of the protective ring 3 is located outside the outer side wall of the upper part of the bottle mouth 5 of the gas storage cylinder. The central rod 4, the end cap 2 and the protective ring 3 are fixedly connected together.

[0016] Scale lines 10 are provided on the outer side wall of the bottle mouth 5 of the gas storage cylinder, and the scale lines 10 are used in cooperation with the lower end face of the protective ring 3. When components such as the end cap 2, the central rod 4, and the protective ring 3 move downward, after the circumferential sealing ring 6 undergoes compressive deformation to achieve circumferential sealing, the lower end face of the protective ring 3 aligns with a specific scale line 10. At this time, the downward movement of components such as the end cap 2, the central rod 4, and the protective ring 3 can be accurately controlled, so that the compressive deformation amount of the circumferential sealing ring 6 remains optimal.

[0017] A preferred solution of the present utility model is that auxiliary installation holes 8 are provided on the outer side of the end cap 2. The auxiliary installation holes 8 are threaded holes, generally 2 to 4 are provided, and are evenly distributed around the circumferential direction of the end cap 2. During use, the threaded end of the threaded rod is connected to the auxiliary installation hole 8 (figure omitted), and the end cap 2, the central rod 4, and the protective ring 3 are rotated through the threaded rod, which is convenient for the installation of the bottle mouth seal. After the bottle mouth seal is installed, the threaded rod is removed, and the auxiliary installation hole 8 is plugged with a plastic plug.

[0018] The bottle mouth seal is provided with an air inlet hole 9, and a connection structure 1 is provided at the top opening of the air inlet hole 9. The connection structure 1 is used for connecting with the end of an external gas pipeline (figure omitted). Figure 1 The shown connection structure 1 is a boss provided above the end cap 2. The boss is fixedly connected to the end cap 2, and the cross-sectional shape is an annular shape. Figure 2 The shown sealing structure and Figure 1 The shown sealing structure is only different in the connection structure 1. Figure 2The shown connecting structure 1 is a cylindrical groove provided on the upper part of the end cover 2 and an inverted truncated conical groove located below the cylindrical groove.

[0019] Figure 1 、 Figure 2 In [Figures], in addition to showing the sealing structure of the present invention, a gas storage cylinder 11 is also shown. The sealing structure of the present invention includes Figure 1 、 Figure 2 All components except the gas storage cylinder 11 in [Figures]. The bottle mouth seal includes Figure 1 、 Figure 2 All components except the gas storage cylinder 11 and the bottle mouth 5 of the gas storage cylinder in [Figures]. The end cover 2 is circular ring-shaped, the protective ring 3 is cylindrical, and the cross-sectional shapes of the central rod 4 and the bottle mouth 5 of the gas storage cylinder are circular ring-shaped; these components, together with the circumferential sealing ring 6, the axial sealing ring 7, and the gas outlet hole 9, are generally coaxially arranged.

[0020] Figure 1 、 Figure 2 For the shown sealing structure, except for the circumferential sealing ring 6 and the axial sealing ring 7, the materials of the remaining components are generally common metal materials in the art, such as stainless steel.

[0021] When installing the bottle mouth seal, first place the axial sealing ring 7 into the axial sealing groove, place the circumferential sealing ring 6 into the circumferential sealing groove, and then insert the central rod 4 into the hole of the bottle mouth 5 of the gas storage cylinder. Rotate the end cover 2. Through the screwing of the external thread section of the central rod 4 and the internal thread section in the hole of the bottle mouth 5 of the gas storage cylinder, components such as the end cover 2, the central rod 4, the protective ring 3, the circumferential sealing ring 6, and the axial sealing ring 7 move downward. Finally, axial sealing is achieved through the compressive deformation of the axial sealing ring 7, and circumferential sealing is achieved through the compressive deformation of the circumferential sealing ring 6. After the installation of the bottle mouth seal is completed, weld and connect the connecting structure 1 with the end of the external gas pipeline.

[0022] It can be understood that the present invention is described through some specific embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these specific embodiments to adapt to specific situations. Therefore, the present invention is not limited by the disclosed specific embodiments. All changes or equivalent replacements falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A bottle mouth sealing structure of a gas storage cylinder, comprising a bottle mouth (5) of the gas storage cylinder and a bottle mouth seal. The bottle mouth seal is provided with a central rod (4) and an end cap (2) located above the central rod (4). A circumferential sealing ring (6) is provided between the end cap (2) and the bottle mouth (5) of the gas storage cylinder. It is characterized in that: The lower part of the end cap (2) is provided with a circumferential sealing groove. The circumferential sealing ring (6) is located between the circumferential sealing groove and the upper end face of the gas cylinder neck (5). The circumferential sealing ring (6) is an O-ring. A protective ring (3) is provided downward from the end cap (2). The inner side wall of the protective ring (3) is located outside the outer side wall of the gas cylinder neck (5). Scale lines (10) are provided on the outer side wall of the gas cylinder neck (5).

2. The bottle mouth sealing structure of the gas storage cylinder according to claim 1, characterized in that: Auxiliary installation holes (8) are provided on the outer side of the end cap (2). The auxiliary installation holes (8) are threaded holes, and 2 to 4 of them are provided.

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