A structure of a fiber-wound plastic inner-liner high-pressure hydrogen storage cylinder

Abstract

The present invention relates to the technical field of high-pressure hydrogen storage, and specifically discloses a structure of a fiber-wound plastic inner-liner high-pressure hydrogen storage bottle, which includes an inner-liner bottle body. A bottle mouth is provided at the upper end of the inner-liner bottle body, and a bottle mouth sealing assembly is provided at the bottle mouth; the bottle mouth sealing assembly includes an airway core tube, a gland head and a booster cover; the present invention can ensure that the inner-liner high-pressure hydrogen storage bottle for storing hydrogen has sufficient pressure-bearing capacity while effectively ensuring its sealing performance; through the combined force of the bottle mouth sealing assembly, an all-round effective protection against the axial and radial pressures of the bottle mouth is formed; effectively ensure the safety and reliability of the airtightness of the high-pressure hydrogen storage bottle mouth, and prevent medium leakage; effectively solve the technical problem that the sealing performance of the existing plastic inner-liner high-pressure hydrogen storage bottle decreases with the increase of the bearing pressure during use.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure hydrogen storage, and particularly to a structure of a high-pressure hydrogen storage cylinder with a fiber-wound plastic inner liner. Background Art

[0002] Hydrogen energy is called the "ultimate energy in the 21st century" by many scientists in the world, but its development and utilization have been stuck in the "world bottleneck" of "difficult storage and transportation" for a long time. Although hydrogen storage containers have been continuously innovated and improved through the preparation of type I (steel cylinders), type II (wound steel cylinders), type III (aluminum alloy inner liner carbon fiber-wound cylinders), and type IV (plastic inner liner carbon fiber-wound cylinders), it has strongly promoted the development and utilization of hydrogen energy and the high-pressure storage and transportation of hydrogen. In the use process of the existing hydrogen storage structure, its sealing performance significantly decreases with the increase of the bearing pressure, and gas leakage may occur, thus unable to meet the sealing requirements. Therefore, there are still certain limitations in use. Summary of the Invention

[0003] Aiming at the defects in the prior art, the purpose of the present invention is to provide a structure of a high-pressure hydrogen storage cylinder with a fiber-wound plastic inner liner, which can effectively ensure the sealing performance to prevent hydrogen leakage while ensuring that the hydrogen storage cylinder has sufficient bearing pressure.

[0004] The technical solution adopted by the present invention is: a structure of a high-pressure hydrogen storage cylinder with a fiber-wound plastic inner liner, including an inner liner cylinder body. A bottle mouth is provided at the upper end of the inner liner cylinder body, and a bottle mouth sealing assembly is provided at the bottle mouth. The bottle mouth sealing assembly includes a gland head, an airway core tube, and a pressure increasing cover. The lower end of the gland head is sleeved on the bottle mouth and is in threaded cooperation with the outer peripheral surface of the bottle mouth. A valve connection port is provided at the upper end of the gland head. The airway core tube is inserted into the bottle mouth and is in threaded cooperation with the inner wall of the bottle mouth. The upper end of the airway core tube is communicated with the valve connection port. The pressure increasing cover is sleeved on the lower end of the gland head and is in threaded cooperation with the outer peripheral surface of the gland head. The lower end of the pressure increasing cover abuts against the outer surface of the upper end of the inner liner cylinder body.

[0005] In this technical solution, the inner liner cylinder body for storing hydrogen ensures the sealing performance of the whole cylinder body by setting a bottle mouth sealing assembly at the bottle mouth at its upper end. After the airway core tube and the gland head of the bottle mouth sealing assembly are installed, the bottle mouth can be tightly wrapped between the airway core tube and the gland head. The valve connection port provided on the gland head is used to connect the valve pipeline structure. Since a pressure increasing cover is also installed on the gland head, through the combination of the inner core of the airway, the gland head, and the pressure increasing cover, the bottle mouth can be locked and reinforced longitudinally and transversely by two three-layer seals inside and outside, up and down, and the resultant force forms an all-round effective protection against the axial and radial pressures of the bottle mouth, effectively ensuring the safety and reliability of the tightness of the bottle mouth of the high-pressure hydrogen storage cylinder without gas leakage, fundamentally solving the safety hazards of loose sealing, running, emitting, seeping, and leaking of high-pressure gas cylinders.

[0006] Further, a welding sealant is coated on the screw joint surface between the inner peripheral wall of the bottle mouth and the outer peripheral surface of the air passage core tube to form a first sealing layer.

[0007] Further, a welding sealant is coated on the screw joint surface between the outer peripheral surface of the bottle mouth and the inner peripheral wall of the gland head to form a second sealing layer.

[0008] Further, an end face sealing portion that abuts against the upper end face of the bottle mouth is provided corresponding to the upper end of the outer periphery of the air passage core tube, and a sealant groove surrounding the end face sealing portion is provided on the inner peripheral wall of the gland head, and the sealant groove is filled with a welding sealant.

[0009] Further, a welding sealant is coated on the screw joint surface between the pressurizing cover and the gland head to form a third sealing layer.

[0010] Further, a rounded bottle shoulder that transitions from the inner liner bottle body to the bottle mouth is provided between the upper end of the inner liner bottle body and the bottle mouth, and a bottle shoulder abutting portion that abuts against the rounded bottle shoulder is provided at the lower end of the pressurizing cover.

[0011] Further, a rounded bottle bottom that transitions to the bottom of the inner liner bottle body is provided at the lower end of the inner liner bottle body, and a composite bottle positioning post is provided at the lowest position of the rounded bottle bottom, and a tail reinforcing support is sleeved on the composite bottle positioning post.

[0012] Further, the upper end of the tail reinforcing support has a tail end abutting portion that abuts against the surface of the rounded bottle bottom.

[0013] Further, a fiber-reinforced composite layer is evenly wound around the outer peripheral surfaces of the inner liner bottle body, the tail reinforcing support, and the pressurizing cover.

[0014] Further, the inner liner bottle body and the bottle mouth are integrally formed by high-density polyethylene or nylon.

[0015] The beneficial effects of the present invention are as follows: The present invention can ensure that the inner liner high-pressure hydrogen storage bottle for storing hydrogen has sufficient bearing pressure while effectively ensuring its sealing performance; through the combined force of the bottle mouth sealing assembly, it can effectively protect the bottle mouth from axial and radial pressures in all directions; it can effectively ensure the safety and reliability of the airtightness of the high-pressure hydrogen storage bottle mouth, thereby preventing medium leakage; it can effectively solve the technical problem that the sealing performance of the existing plastic inner liner high-pressure hydrogen storage bottle decreases as the bearing pressure increases during use; it has high practical value and promotion value. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the specific embodiments of the present invention, the drawings required for the specific embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is the structural diagram of the inner liner bottle body of the fiber-wound plastic inner liner high-pressure hydrogen storage bottle structure provided by the embodiment of the present invention.

[0018] Figure 2 This is the structural diagram of the bottle mouth sealing assembly of the fiber-wound plastic inner liner high-pressure hydrogen storage bottle structure provided by the embodiment of the present invention Figure 1 。

[0019] Figure 3 This is the structural diagram of the bottle mouth sealing assembly of the fiber-wound plastic inner liner high-pressure hydrogen storage bottle structure provided by the embodiment of the present invention Figure 1 。

[0020] Figure 4 This is the structural diagram of the bottom of the inner liner bottle body of the fiber-wound plastic inner liner high-pressure hydrogen storage bottle structure provided by the embodiment of the present invention.

[0021] Reference numerals: inner liner bottle body 100, bottle mouth 110, rounded bottle shoulder 120, rounded bottle bottom 130, gland head 200, sealing glue groove 210, air duct core pipe 300, end face sealing part 310, pressurizing cover 400, bottle shoulder abutting part 410, composite bottle positioning column 500, tail end strengthening support 600, tail end abutting part 700, fiber-reinforced composite layer 800. Detailed implementation manners

[0022] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0023] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0024] As Figures 1 to 4 shown, a specific embodiment of the present invention provides a fiber-wound plastic inner liner high-pressure hydrogen storage bottle structure, including an inner liner bottle body 100, the upper end of the inner liner bottle body 100 is provided with a bottle mouth 110, and the bottle mouth 110 is provided with a bottle mouth sealing assembly; the inner liner bottle body 100 for storing hydrogen ensures the tightness of the entire bottle body by setting a bottle mouth sealing assembly at the bottle mouth 110 at its upper end, thereby solving safety hazards such as loose sealing, running, leaking, and seeping of high-pressure gas cylinders.

[0025] As Figures 1 to 4As shown in the figure, the bottle mouth sealing assembly in this embodiment includes a gland head 200, an air duct core pipe 300, and a pressurizing cover 400; the lower end of the gland head 200 is sleeved on the bottle mouth 110 and is in threaded cooperation with the outer peripheral surface of the bottle mouth 110, and a valve connection port is provided at the upper end of the gland head 200; the air duct core pipe 300 is inserted into the bottle mouth 110 and is in threaded cooperation with the inner wall of the bottle mouth 110, and the upper end of the air duct core pipe 300 is communicated with the valve connection port; the pressurizing cover 400 is sleeved on the lower end of the gland head 200 and is in threaded cooperation with the outer peripheral surface of the gland head 200, and the lower end of the pressurizing cover 400 abuts against the outer surface of the upper end of the inner liner bottle body 100. Through the above settings, after the air duct core pipe 300 and the gland head 200 of the bottle mouth sealing assembly are installed, the bottle mouth 110 can be tightly wrapped between the air duct core pipe 300 and the gland head 200. The valve connection port provided on the gland head 200 is used to connect the valve pipeline structure; since a pressurizing cover 400 is also installed on the gland head 200; through the combination of the inner core of the air duct, the gland head 200, and the pressurizing cover 400, the bottle mouth 110 can be locked and reinforced longitudinally and transversely by two three-layer seals inside and outside, up and down, and the resultant force forms an all-round effective protection against the axial and radial pressures of the bottle mouth 110; effectively ensuring the safety and reliability of the airtightness of the bottle mouth 110 of the high-pressure hydrogen storage bottle without gas leakage. In actual installation and application, the air duct core pipe 300 is tightly spun with the inner wall of the bottle mouth 110, and at least 13 threads are provided on the inner wall of the bottle mouth 110 to achieve a tight threaded fit with the air duct core pipe 300. Similarly, the gland head 200 is also tightly fitted with the bottle mouth 110 by means of threaded connection, which can effectively prevent the bottle mouth 110 from generating relative displacement with the contact surface during the stress process, that is, effectively enhancing the pressure-bearing strength of the plastic bottle mouth 110 structure; both the air duct core pipe 300 and the gland head 200 are made of metal materials.

[0026] As Figures 1 to 4 shown, in order to avoid gaps between the inner and outer walls of the bottle mouth 110 and the air duct core pipe 300 and the threaded sleeve, a welding sealant is coated on the screw joint surface between the inner peripheral wall of the bottle mouth 110 in this embodiment and the outer peripheral surface of the air duct core pipe 300 to form a first sealing layer. At the same time, a welding sealant is coated on the screw joint surface between the outer peripheral surface of the bottle mouth 110 and the inner peripheral wall of the gland head 200 to form a second sealing layer. The first sealing layer and the second sealing layer can tightly seal the outer wall of the air duct core pipe 300, the inner and outer walls of the bottle mouth 110, and the inner wall of the gland head 200. The welding sealant can tightly seal the gland head 200, the bottle mouth 110, and the air duct core pipe 300, and the installation is more firm, so that the inner liner bottle body 100 will not be separated due to the strong pressure generated by injecting high-pressure gas and the gas will not seep out; preventing the separation, tearing, decapitation, or breaking of the bottle mouth 110 wall from the metal seals of the air duct core pipe 300 or the gland head 200 after the bottle mouth 110 is pressurized, and solving the safety hazard of air leakage at the bottle mouth 110 of the high-pressure container.

[0027] AsFigures 1 to 4 As shown, since the airway core tube 300 is located within the gland head 200, in order to improve the sealing performance between the airway core tube 300 and the gland head 200, in this embodiment, an end face sealing portion 310 that abuts against the upper end face of the bottle mouth 110 is provided on the outer periphery of the airway core tube 300 corresponding to the upper end of the bottle mouth 110. A sealing glue groove 210 is provided on the inner peripheral wall of the gland head 200 and is arranged around the end face sealing portion 310, and a welding sealant is filled in the sealing glue groove 210. In this way, after pouring liquid sealant welding glue into the sealing glue groove 210, the gap between the airway core tube 300 and the inner wall of the gland head 200 can be filled. When the sealant layer cures, a suitable sealant pad will be formed, which is equivalent to installing a suitable sealant ring on the outer periphery of the end face sealing portion 310, facilitating the improvement of the sealing performance. After forming the sealant end, it can effectively restrict the slippage of the sealed bottle mouth 110 within the thread under high pressure. The sealant pad is in close contact and sealed with the gland head 200, so that the sealing performance of the contact surface between the bottle mouth 110 structure and the gland head 200 can be effectively enhanced.

[0028] As Figures 1 to 4 shown, in this embodiment, a welding sealant is also coated on the screwed joint surface between the pressure increasing cover 400 and the gland head 200 to form a third sealing layer. The pressure increasing cover 400 can be tightly installed at the lower end of the gland head 200, making the installation of the pressure increasing cover 400 more firm. The welding sealant is used to fill the gap between the pressure increasing cover 400 and the outer periphery of the gland head 200 to improve the sealing performance. And a rounded bottle shoulder 120 transitioning from the inner liner bottle body 100 to the bottle mouth 110 is provided between the upper end of the inner liner bottle body 100 and the bottle mouth 110. A bottle shoulder abutting portion 410 that abuts against the rounded bottle shoulder 120 is provided at the lower end of the pressure increasing cover 400. In this way, the bottle shoulder abutting portion 410 and the rounded bottle shoulder 120 can form a close surface contact, playing a role in resisting axial pressure, thereby preventing the bottle mouth 110 from bursting under high pressure. The pressure increasing cover 400 is preferably made of a metal material.

[0029] As Figures 1 to 4 shown, in order to prevent the inner liner bottle body 100 from deforming due to pressure, a rounded bottle bottom 130 transitioning towards the bottom of the inner liner bottle body 100 is provided at the lower end of the inner liner bottle body 100. A composite bottle positioning post 500 is provided at the lowest position of the rounded bottle bottom 130, and a tail end reinforcing support 600 is sleeved on the composite bottle positioning post 500. The tail end reinforcing support 600 can be inserted and matched with the composite bottle positioning post 500, and the upper end of the tail end reinforcing support 600 has a tail end abutting portion 700 that abuts against the surface of the rounded bottle bottom 130. In this way, when the pressure inside the bottle increases, the tail end reinforcing support 600 can provide protection for the inner liner bottle body 100 and provide a certain reverse force to ensure that the inner liner bottle body 100 does not deform.

[0030] As Figures 1 to 4As shown, in practical applications, the inner liner bottle body 100 and the bottle mouth 110 are integrally formed of high-density polyethylene or nylon, and can be made by stretch forming process. Compared with traditional gas cylinders, plastic gas storage cylinders have the advantages of light weight and large gas storage mass under the same volume. In order to improve the pressure-bearing performance of the inner liner bottle body 100, in this embodiment, a fiber-reinforced composite layer 800 is evenly wound around the outer peripheral surfaces of the inner liner bottle body 100, the tail reinforcement support 600 and the pressure-increasing cover 400. The fiber-reinforced composite layer 800 wound on the inner liner bottle body 100 can enhance the ability of the inner liner bottle body 100 to withstand internal pressure. After the fiber-reinforced composite layer 800 is wound on the pressure-increasing cover 400, it can play a role in resisting axial pressure and increase the explosion-proof performance of the bottle body under high pressure. Winding the fiber-reinforced composite layer 800 on the tail reinforcement support 600 can further increase the pressure-bearing value at the tail of the plastic hydrogen storage bottle. The fiber-reinforced composite layer 800 can be immersed in an impregnating agent before winding to increase the adhesion area of the fiber wire diameter and strengthen the fiber rigidity. During winding, different winding layers can be set according to the pressure resistance requirements of the composite high-pressure hydrogen storage cylinder, and superposition composite reinforcement can be carried out so that different thickness fiber-reinforced composite layers 800 can withstand different air pressure intensities, and application products that meet different pressure requirements can be prepared.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A structure of a fiber-wound plastic inner liner high-pressure hydrogen storage cylinder, including an inner liner cylinder body (100), characterized in that: a bottle mouth (110) is provided at the upper end of the inner liner cylinder body (100), and a bottle mouth sealing assembly is provided on the bottle mouth (110); The bottle mouth sealing assembly includes a gland head (200), an air duct core pipe (300) and a pressurizing cover (400); the lower end of the gland head (200) is sleeved on the bottle mouth (110) and is in threaded cooperation with the outer peripheral surface of the bottle mouth (110), and a valve connection port is provided at the upper end of the gland head (200); the air duct core pipe (300) is inserted into the bottle mouth (110) and is in threaded cooperation with the inner wall of the bottle mouth (110), and the upper end of the air duct core pipe (300) is communicated with the valve connection port; the pressurizing cover (400) is sleeved on the lower end of the gland head (200) and is in threaded cooperation with the outer peripheral surface of the gland head (200), and the lower end of the pressurizing cover (400) abuts against the outer surface of the upper end of the inner liner cylinder body (100); An end face sealing portion (310) that abuts against the upper end face of the bottle mouth (110) is provided on the outer periphery of the air duct core pipe (300) corresponding to the upper end of the bottle mouth (110), a sealing glue groove (210) arranged around the end face sealing portion (310) is provided on the inner peripheral wall of the gland head (200), and welding sealing glue is filled in the sealing glue groove (210); A rounded bottle bottom (130) that transitions towards the bottom of the inner liner cylinder body (100) is provided at the lower end of the inner liner cylinder body (100), a composite bottle positioning column (500) is provided at the lowest position of the rounded bottle bottom (130), and a tail end reinforcing support (600) is sleeved on the composite bottle positioning column (500).

2. The structure of the fiber-wound plastic inner-liner high-pressure hydrogen storage cylinder according to claim 1, characterized in that; A first sealing layer is formed by coating welding sealing glue on the screw joint surface between the inner peripheral wall of the bottle mouth (110) and the outer peripheral surface of the air duct core pipe (300).

3. The structure of the fiber-wound plastic inner-liner high-pressure hydrogen storage cylinder according to claim 1, wherein; A second sealing layer is formed by coating welding sealing glue on the screw joint surface between the outer peripheral surface of the bottle mouth (110) and the inner peripheral wall of the gland head (200).

4. The structure of the fiber-wound plastic inner liner high-pressure hydrogen storage cylinder according to claim 1, wherein; A third sealing layer is formed by coating welding sealing glue on the screw joint surface between the pressurizing cover (400) and the gland head (200).

5. The structure of the fiber-wound plastic inner-liner high-pressure hydrogen storage cylinder according to claim 1, wherein; A rounded bottle shoulder (120) that transitions from the inner liner cylinder body (100) to the bottle mouth (110) is provided between the upper end of the inner liner cylinder body (100) and the bottle mouth (110), and a bottle shoulder abutting portion (410) that abuts against the rounded bottle shoulder (120) is provided at the lower end of the pressurizing cover (400).

6. The structure of the fiber-wound plastic inner liner high-pressure hydrogen storage cylinder according to claim 1, wherein; The upper end of the tail end reinforcing support (600) has a tail end abutting portion (700) that abuts against the surface of the rounded bottle bottom (130).

7. The structure of the fiber-wound plastic inner-liner high-pressure hydrogen storage cylinder according to any one of claims 1-6, characterized in that ； A fiber-reinforced composite layer (800) is evenly wound around the outer peripheral surfaces of the inner liner cylinder body (100), the tail end reinforcing support (600) and the pressurizing cover (400).

8. The structure of the fiber-wound plastic inner-liner high-pressure hydrogen storage bottle according to any one of claims 1-6, characterized in that; The inner liner cylinder body (100) and the bottle mouth (110) are integrally formed by using high-density polyethylene or nylon.

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