Hydrogen storage wellhead seal structure
Patent Information
- Application Number
- CN202522129867.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-09
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-10-09
AI Technical Summary
储氢井作为一种重要的高压储氢设施，其密封性能直接关系到氢气的安全储存与使用，现有的储氢井口密封结构主要依赖两种密封方式：一是通过连接件的紧密接触形成初始密封，如井口与外部设备接口；二是在法兰盘组之间增设密封圈，并利用高强度螺栓施加预紧力，使密封圈受压变形以增强密封效果，由于氢气的高渗透性及高压环境，法兰连接处承受持续的循环应力，易导致螺栓预紧力松弛
1、一种储氢井口密封结构，包括设置在储氢井口端面的安装槽、沿储氢井口周向设置的第一法兰盘、与储氢井口可拆卸式连接的封盖以及沿封盖周向设置的第二法兰盘；所述安装槽用于容纳封盖的侧壁，且所述安装槽设置为能密封式接触封盖的侧壁；所述第一法兰盘的端面设置为能密封式接触到第二法兰盘的端面；所述第一法兰盘的端面上沿周向设置第一槽，所述第一槽内设置第一密封圈；所述第二法兰盘的端面上沿周向设置与第一槽匹配的第二槽，所述第二槽内设置与第一密封圈匹配的第二密封圈；所述第一槽和第二槽能组合形成密封腔，所述第一密封圈和第二密封圈的组合能过盈填充在所述密封腔内；所述第一法兰盘通过紧固件与第二法兰盘连接。本实用新型通过安装槽和封盖的侧壁紧密接触实现快速定位安装和初步密封；第一密封圈和第二密封圈的L形卡扣设计，在水平与垂直方向形成第二道双重密封屏障，有效防止氢气泄漏。即使初步密封失效，氢气压力会进一步挤压密封圈，增强接触紧密性，确保密封效果；限位环通过半圆环设计卡扣在法兰盘表面，配合密封垫形成第三道密封屏障，防止螺栓松动导致的密封失效，显著提升密封结构的可靠性和长期稳定性。
Smart Images
Figure CN224756765U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydrogen storage well sealing technology, specifically to a hydrogen storage wellhead sealing structure. Background Technology
[0002] With the rapid development of the hydrogen energy industry, high-pressure hydrogen storage technology has become a key link in hydrogen storage and transportation. As an important high-pressure hydrogen storage facility, the sealing performance of hydrogen storage wells directly affects the safe storage and use of hydrogen. Existing wellhead sealing structures mainly rely on two sealing methods: one is to form an initial seal through tight contact of connecting parts, such as the interface between the wellhead and external equipment; the other is to add a sealing ring between flange assemblies and apply pre-tightening force using high-strength bolts, causing the sealing ring to deform under pressure to enhance the sealing effect. Due to the high permeability of hydrogen and the high-pressure environment, the flange connection is subjected to continuous cyclic stress, which can easily lead to loosening of the bolt pre-tightening force. Once the bolts loosen, the clamping force between the flanges decreases, the sealing ring rebounds insufficiently, and micron-level gaps appear at the sealing interface, causing hydrogen leakage. Because the sealing structure lacks means to monitor the sealing status in real time, it usually relies on periodic manual inspections, making it difficult to provide timely warnings in the early stages of leakage, posing a safety hazard.
[0003] Therefore, there is an urgent need to provide a sealing structure that is reliable and stable over a long period of time to solve the problems existing in the prior art. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a reliable and long-term stable hydrogen storage wellhead sealing structure.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A hydrogen storage wellhead sealing structure includes an installation groove disposed on the end face of the hydrogen storage wellhead, a first flange disposed around the circumference of the hydrogen storage wellhead, a cover detachably connected to the hydrogen storage wellhead, and a second flange disposed around the circumference of the cover. The mounting groove is used to accommodate the sidewall of the cap, and the mounting groove is configured to make a sealing contact with the sidewall of the cap. The end face of the first flange is configured to seal against the end face of the second flange; a first groove is provided circumferentially on the end face of the first flange, and a first sealing ring is provided in the first groove; a second groove matching the first groove is provided circumferentially on the end face of the second flange, and a second sealing ring matching the first sealing ring is provided in the second groove. The first groove and the second groove can be combined to form a sealing cavity, and the combination of the first sealing ring and the second sealing ring can be interference-filled in the sealing cavity; The first flange is connected to the second flange by fasteners.
[0007] As a further improvement to the above technical solution: It also includes a limiting mechanism arranged along the circumference of the first flange and the circumference of the second flange; The limiting mechanism includes a limiting ring; The limiting ring includes two sets of spliced semicircular rings, and the inner side of the semicircular ring is provided with a limiting groove that can simultaneously accommodate the first flange and the second flange. After the two sets of semicircular rings are spliced together, the limiting groove can be fastened to the surface of the first flange and the second flange, and the limiting groove can seal the splice seam between the first flange and the second flange.
[0008] As a further improvement to the above technical solution: The limiting mechanism also includes a connecting component, and the two sets of semicircular rings are spliced together and detachably connected to the cover through the connecting component; The connecting assembly includes a connecting plate disposed on a semi-circular ring and a fixing plate disposed on a cover, the connecting plate and the fixing plate being connected by fasteners.
[0009] As a further improvement to the above technical solution: The fastener is a bolt.
[0010] As a further improvement to the above technical solution: The limiting mechanism also includes a sealing gasket, which is disposed on the splicing end face of the two sets of semicircular rings.
[0011] As a further improvement to the above technical solution: The limiting ring is also equipped with a connecting pipe that connects the limiting groove and the hydrogen leak detection equipment.
[0012] As a further improvement to the above technical solution: The surface of the connecting pipe is provided with connecting threads.
[0013] As a further improvement to the above technical solution: The cross-sections of the first and second sealing rings are both L-shaped and matched.
[0014] As a further improvement to the above technical solution: The cover is provided with a connection port for connecting to an external pipe.
[0015] Compared with the prior art, the advantages of this utility model are: 1. A hydrogen storage wellhead sealing structure, comprising an installation groove disposed on the end face of the hydrogen storage wellhead, a first flange disposed circumferentially along the hydrogen storage wellhead, a cap detachably connected to the hydrogen storage wellhead, and a second flange disposed circumferentially along the cap; the installation groove is used to accommodate the side wall of the cap, and the installation groove is configured to sealably contact the side wall of the cap; the end face of the first flange is configured to sealably contact the end face of the second flange; a first groove is disposed circumferentially on the end face of the first flange, and a first sealing ring is disposed in the first groove; a second groove matching the first groove is disposed circumferentially on the end face of the second flange, and a second sealing ring matching the first sealing ring is disposed in the second groove; the first groove and the second groove can be combined to form a sealing cavity, and the combination of the first sealing ring and the second sealing ring can interference fill the sealing cavity; the first flange is connected to the second flange by fasteners. This invention achieves rapid positioning and initial sealing through the close contact between the installation groove and the side wall of the cap; the L-shaped snap-fit design of the first and second sealing rings forms a second double sealing barrier in the horizontal and vertical directions, effectively preventing hydrogen leakage. Even if the initial seal fails, the hydrogen pressure will further compress the sealing ring, enhancing the tightness of the contact and ensuring the sealing effect. The limiting ring is snapped onto the flange surface through a semi-circular ring design, forming a third sealing barrier with the sealing gasket to prevent seal failure caused by loose bolts, significantly improving the reliability and long-term stability of the sealing structure.
[0016] 2. This utility model, through the connection of a hydrogen leak detection device to the external pipe, can monitor the sealing status in real time, promptly detect potential leaks, and provide early warnings. It solves the problem of the lag in traditional sealing structures that rely on manual inspection. The precise matching design of the mounting groove and connecting parts reduces installation errors and achieves rapid positioning and initial sealing, improving construction efficiency. The combined use of the connecting plate, fixing plate, and high-strength bolts enhances the stability of the limiting ring, ensuring that the sealing structure can withstand continuous cyclic stress under high pressure. Attached Figure Description
[0017] Figure 1 This is a perspective view of a hydrogen storage wellhead sealing structure in this embodiment; Figure 2 A partial cross-sectional view of the sealing structure at the hydrogen storage wellhead after the limiting ring has been removed; Figure 3 This is a schematic diagram of the assembly of the limit ring.
[0018] In the attached diagram: 1. Hydrogen storage wellhead; 2. Installation groove; 3. Cover; 4. First flange; 5. First groove; 6. First sealing ring; 7. Second flange; 8. Second groove; 9. Second sealing ring; 10. Fastener; 11. Limiting mechanism; 11.1. Semicircular ring; 11.2. Connecting plate; 11.3. Fixing plate; 11.4. Sealing gasket. Detailed Implementation
[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] Example: Please see Figures 1-3 Hydrogen storage wells are underground storage facilities specifically designed for storing hydrogen. They typically utilize natural underground geological structures for long-term hydrogen storage, which is a mature existing technology. As the main structure for hydrogen storage, hydrogen storage wells usually utilize underground geological conditions to achieve safe storage of high-pressure hydrogen. The hydrogen storage wellhead 1 is equipped with a cover 3 for connecting to external equipment. The cover 3 is equipped with a connection port for connecting to external pipelines, such as hydrogen pipelines, to realize hydrogen transportation.
[0021] The sealing structure of the hydrogen storage wellhead 1 in this embodiment includes an installation groove 2 disposed on the end face of the hydrogen storage wellhead 1, a first flange 4 disposed around the circumference of the hydrogen storage wellhead 1, a cap 3 detachably connected to the hydrogen storage wellhead 1, and a second flange 7 disposed around the circumference of the cap 3. The installation groove 2 is used to accommodate the side wall of the cap 3, and the installation groove 2 is configured to make a sealing contact with the side wall of the cap 3. The installation groove 2 precisely matches the size of the cap 3, realizing rapid positioning and initial sealing, while reducing installation errors and forming the first sealing barrier.
[0022] The end face of the first flange 4 is configured to sealably contact the end face of the second flange 7; a first groove 5 is provided circumferentially on the end face of the first flange 4, and a first sealing ring 6 is provided in the first groove 5; a second groove 8 matching the first groove 5 is provided circumferentially on the end face of the second flange 7, and a second sealing ring 9 matching the first sealing ring 6 is provided in the second groove 8; the first groove 5 and the second groove 8 can be combined to form a sealing cavity, and the combination of the first sealing ring 6 and the second sealing ring 9 can interference fill the sealing cavity to form a second sealing barrier; The first flange 4 is connected to the second flange 7 by fasteners 10, which are bolts. The first flange 4 and the second flange 7 rigidly connect the hydrogen storage wellhead 1 to the cap 3, and withstand the mechanical stress under high pressure. It also includes a limiting mechanism 11 arranged circumferentially along the first flange 4 and the second flange 7; the limiting mechanism 11 includes a limiting ring; the limiting ring includes two sets of spliced semicircular rings 11.1, which are horizontally symmetrically designed, and the inner side of the semicircular rings 11.1 is provided with a limiting groove that can simultaneously accommodate the first flange 4 and the second flange 7; after the two sets of semicircular rings 11.1 are spliced, they are locked onto the surfaces of the first flange 4 and the second flange 7 through the limiting groove, so as to limit the first flange 4 and the second flange 7 and prevent the seal failure caused by loose bolts. The limiting groove can seal the splice seam between the first flange 4 and the second flange 7.
[0023] The limiting mechanism 11 in this embodiment also includes a connecting component. The two sets of semicircular rings 11.1 are spliced together and detachably connected to the cover 3 through the connecting component. The connecting component includes a connecting plate 11.2 disposed on the semicircular ring 11.1 and a fixing plate 11.3 disposed on the cover 3. The connecting plate 11.2 and the fixing plate 11.3 are connected by fasteners 10. The connecting plate 11.2 and the fixing plate 11.3 enhance the stability of the limiting ring.
[0024] The limiting mechanism 11 also includes a sealing gasket 11.4, which is disposed on the splicing end face of the two sets of semicircular rings 11.1. The sealing gasket 11.4 fills the gap between the semicircular rings 11.1 to form a third sealing barrier.
[0025] The limiting ring is also equipped with a connecting pipe that connects the limiting groove and the hydrogen leak detection device. The connecting pipe is connected to the hydrogen leak detection device to monitor the sealing status in real time and issue timely leak warnings. The connecting pipe surface is provided with connecting threads. The surface of the connecting pipe is provided with connecting threads.
[0026] The first sealing ring 6 and the second sealing ring 9 both have matching L-shaped cross-sections, which can interlock to form a complete circular ring that fills the sealing cavity. Through the L-shaped first sealing ring 6 and the second sealing ring 9, the first sealing ring 6 and the second sealing ring 9 are doubly interlocked in the horizontal and vertical directions. Under the pre-tightening force of the fastener 10, they deform and fill the micro gaps. If the initial seal fails, the hydrogen pressure will further compress the first sealing ring 6 and the second sealing ring 9, enhancing the tightness of the contact.
[0027] The working principle of the sealing structure of the hydrogen storage wellhead 1 in this embodiment is as follows: the cover 3 is inserted into the mounting groove 2 at the top of the hydrogen storage wellhead 1, and a preliminary seal is achieved through close contact. The first flange 4 and the second flange 7 are fastened with bolts, causing the first sealing ring 6 and the second sealing ring 9 to be squeezed and deformed against each other, forming a double snap-fit seal in the horizontal and vertical directions. The limiting ring is snapped onto the surface of the first flange 4 and the second flange 7, and the connecting plate 11.2 and the fixing plate 11.3 are fixed with bolts, so that the sealing gasket 11.4 is compressed and fills the gap, forming a third sealing barrier, and limiting the first flange 4 and the second flange 7 to prevent the seal from failing.
[0028] If the initial seal fails, the hydrogen pressure will horizontally compress the first sealing ring 6 and the second sealing ring 9, further enhancing the tightness of the sealing contact surface. An external detection device connected to the connecting pipe monitors the sealing status in real time, providing timely warnings in case of leakage and ensuring the safe operation of the hydrogen storage well. Through multiple sealing and limiting designs, combined with real-time monitoring, the sealing performance and reliability of the hydrogen storage wellhead 1 are significantly improved, making it suitable for high-pressure hydrogen storage environments.
[0029] The above description is merely a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A hydrogen storage wellhead sealing structure, characterized in that, It includes an installation groove set on the end face of the hydrogen storage wellhead, a first flange set along the circumference of the hydrogen storage wellhead, a cover detachably connected to the hydrogen storage wellhead, and a second flange set along the circumference of the cover. The mounting groove is used to accommodate the sidewall of the cap, and the mounting groove is configured to make a sealing contact with the sidewall of the cap. The end face of the first flange is configured to seal against the end face of the second flange; a first groove is provided circumferentially on the end face of the first flange, and a first sealing ring is provided in the first groove; a second groove matching the first groove is provided circumferentially on the end face of the second flange, and a second sealing ring matching the first sealing ring is provided in the second groove. The first groove and the second groove can be combined to form a sealing cavity, and the combination of the first sealing ring and the second sealing ring can be interference-filled in the sealing cavity; The first flange is connected to the second flange by fasteners.
2. The hydrogen storage wellhead sealing structure according to claim 1, characterized in that, It also includes a limiting mechanism arranged along the circumference of the first flange and the circumference of the second flange; The limiting mechanism includes a limiting ring; The limiting ring includes two sets of spliced semicircular rings, and the inner side of the semicircular ring is provided with a limiting groove that can simultaneously accommodate the first flange and the second flange. After the two sets of semicircular rings are spliced together, the limiting groove can be fastened to the surface of the first flange and the second flange, and the limiting groove can seal the splice seam between the first flange and the second flange.
3. The hydrogen storage wellhead sealing structure according to claim 2, characterized in that, The limiting mechanism also includes a connecting component, and the two sets of semicircular rings are spliced together and detachably connected to the cover through the connecting component; The connecting assembly includes a connecting plate disposed on a semi-circular ring and a fixing plate disposed on a cover, the connecting plate and the fixing plate being connected by fasteners.
4. The hydrogen storage wellhead sealing structure according to claim 3, characterized in that, The fastener is a bolt.
5. The hydrogen storage wellhead sealing structure according to claim 2, characterized in that, The limiting mechanism also includes a sealing gasket, which is disposed on the splicing end face of the two sets of semicircular rings.
6. The hydrogen storage wellhead sealing structure according to claim 2, characterized in that, The limiting ring is also equipped with a connecting pipe that connects the limiting groove and the hydrogen leak detection equipment.
7. The hydrogen storage wellhead sealing structure according to claim 6, characterized in that, The surface of the connecting pipe is provided with connecting threads.
8. The hydrogen storage wellhead sealing structure according to claim 1, characterized in that, The cross-sections of the first and second sealing rings are both L-shaped and matched.
9. The hydrogen storage wellhead sealing structure according to claim 1, characterized in that, The cover is provided with a connection port for connecting to an external pipe.