A seal structure for a high-pressure vessel

Abstract

The utility model discloses a kind of sealing structure for high-pressure vessel, it is related to sealing technical field.The sealing structure for high-pressure vessel of the application, including flange body and flange cover connected coaxially, flange cover has the first end face towards flange body, flange body has the second end face towards flange cover, one of first end face and second end face is provided with convex ring, and the other is provided with ring groove, sealing element is arranged in ring groove, convex ring is embedded in ring groove and with sealing element abutment.This application's sealing structure, convex ring and ring groove on it can limit sealing element, avoid sealing element to produce position deviation under high pressure, improve the overall sealing performance of sealing structure;Meanwhile, ring groove can provide sealing element with expansion accommodation space, effectively avoid sealing element to be damaged under the action of larger bolt pretightening force, prolong the service life of sealing structure.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing structure for high-pressure vessels. Background Technology

[0002] Hydrogen energy has become a hot research area both domestically and internationally in recent years. It is a secondary clean energy source and is hailed as the "ultimate energy of the 21st century." Currently, hydrogen energy is generally stored using high-pressure hydrogen storage containers. Since the hydrogen pressure in these containers can reach up to 70 MPa, effective sealing through a sealing structure is necessary to prevent hydrogen leakage.

[0003] The existing sealing structure consists of five parts: a connecting flange, a flange cover, a seal, bolts, and nuts. The connecting flange and the flange cover are connected by bolts and nuts, and both share the internal pressure load. The seal is located between the flange and the flange cover to perform the sealing function. The existing technology has the following drawbacks: First, the seal is prone to displacement under high pressure during use, leading to a decrease in the overall sealing performance of the sealing structure. Second, to ensure a good seal, the bolts and nuts need to be tightened as much as possible; however, the large preload generated after tightening the bolts can easily crush the seal, causing damage and thus reducing the overall sealing performance of the sealing structure.

[0004] CN111878578A discloses a cryogenic sealing device with a V-ring, including a sealing assembly and a V-ring. The sealing assembly includes a T-cap, at least two springs, and a housing. The housing includes a columnar portion with an upwardly opening, a semi-circular ring wall, and a trapezoidal platform. The V-ring includes a columnar ring body and a V-ring body disposed on the top plane of the columnar ring body. Both the columnar ring body and the V-ring body are integral pieces made of modified PTFE material. This device is used in cryogenic environments for liquefied natural gas, but is not suitable for use in high-pressure hydrogen environments, and its structure is relatively complex. Utility Model Content

[0005] In order to overcome the problems of easy displacement and crushing damage of the sealing components in the existing technology, which leads to a decrease in sealing performance, this utility model provides a sealing structure for high-pressure vessels.

[0006] The sealing structure for high-pressure vessels provided by this utility model includes a flange body and a flange cover coaxially connected. The flange cover has a first end face facing the flange body, and the flange body has a second end face facing the flange cover. A convex ring is provided on one of the first end face and the second end face, and an annular groove is provided on the other end face. A sealing element is placed in the annular groove, and the convex ring is embedded in the annular groove and abuts against the sealing element.

[0007] By adopting the above technical solution, the seal element housed in the annular groove can be limited by the convex ring and the annular groove, preventing the seal element from shifting position under high pressure and improving the overall sealing performance of the sealing structure. At the same time, the annular groove can provide the seal element with expansion and contraction space, effectively preventing the seal element from being damaged under the action of large bolt preload and extending the service life of the sealing structure.

[0008] In one specific implementation, the convex ring is concentrically disposed on the first end face, and the annular groove is concentrically formed on the second end face.

[0009] In one specific implementation, the convex ring includes a first ring body and a second ring body that are concentrically arranged and have gradually increasing diameters, and the ring groove includes a first groove body and a second groove body that are concentrically arranged and have gradually increasing diameters, wherein the first ring body is embedded in the first groove body and the second ring body is embedded in the second groove body.

[0010] By adopting the above technical solution, the sealing elements in both the first and second tanks can seal the high-pressure vessel, thereby achieving a double seal on the high-pressure vessel and effectively improving the sealing effect.

[0011] In one specific implementation, the seal includes a first sealing body housed in the first groove and a second sealing body housed in the second groove, wherein the first ring body abuts against the first sealing body and the second ring body abuts against the second sealing body.

[0012] By adopting the above technical solution, the first ring body and the second ring body can respectively abut against the first sealing body and the second sealing body, thereby preventing the first sealing body and the second sealing body from shifting position.

[0013] In one specific implementation, the first sealing body includes a deformable sealing body, a sealing groove formed on the sealing body, and a first elastic body accommodated in the sealing groove. The first elastic body has two elastic ends, which respectively abut against the two side walls of the sealing groove.

[0014] By adopting the above technical solution, the two elastic ends can tightly fit the sealing body onto the first ring and the first groove, effectively ensuring the sealing effect of the first sealing body.

[0015] In one specific implementation, the sealing body is annular, the sealing groove is circumferentially formed on the inner side of the sealing body, and the first elastic body is annular with its centerline coinciding with the centerline of the sealing body.

[0016] In one specific implementation, the first elastic body includes an outer spring and an inner spring, both of which are V-shaped and each has a V-shaped opening. The inner spring is housed in the opening of the outer spring, and the two ends of the outer spring are connected to the two ends of the inner spring in pairs to form the two elastic ends.

[0017] By adopting the above technical solution, the first elastic body can output better rebound performance under the cooperation of the outer spring and the inner spring, which further improves the sealing effect of the first sealing body.

[0018] In one specific implementation, the sealing body has two integrally formed sealing lips, the sealing groove is formed between the two sealing lips, and the two elastic ends respectively abut against the two sealing lips.

[0019] By adopting the above technical solution, the two sealing lips can press against the first ring and the first groove under the action of the two elastic ends, effectively improving the sealing effect.

[0020] In one specific implementation, each of the sealing lips includes a lip body, the ends of the two lip bodies are bent toward each other to form two limiting portions, and the two elastic ends abut against the two limiting portions.

[0021] By adopting the above technical solution, the first elastomer is effectively prevented from falling out of the sealing groove during use, thus extending the service life of the first seal.

[0022] In one specific implementation, the second seal includes a second elastomer and a sealing layer covering the second elastomer.

[0023] By adopting the above technical solution, the resilience and sealing performance of the second sealing body are effectively improved, so that the second sealing body can have an excellent sealing effect.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] The seal, housed in the annular groove, is limited by the convex ring and the annular groove, preventing the seal from shifting under high pressure and improving the overall sealing performance of the sealing structure. At the same time, the annular groove provides space for the seal to expand and contract, effectively preventing damage to the seal under large bolt preload and extending the service life of the sealing structure. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the sealing structure according to an embodiment of this application.

[0027] Figure 2 yes Figure 1 A schematic diagram of the axial section.

[0028] Figure 3 yes Figure 2 Enlarged diagram of point A in the diagram.

[0029] Figure 4 yes Figure 2 Enlarged diagram of point B in the image.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Flange cover; 11. First end face; 2. Flange body; 21. Second end face; 3. Raised ring; 31. First ring body; 32. Second ring body; 4. Ring groove; 41. First groove body; 42. Second groove body; 5. Seal; 51. First sealing body; 511. Sealing body; 512. Sealing groove; 513. First elastic body; 5131. Outer spring; 5132. Inner spring; 514. Elastic end; 515. Sealing lip; 5151. Lip body; 5152. Limiting part; 52. Second sealing body; 521. Second elastic body; 522. Sealing layer. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] See Figure 1-4 As shown, a sealing structure for a high-pressure vessel is illustrated, comprising a flange body 2 and a flange cover 1 coaxially connected by bolts and nuts. The flange cover 1 has a first end face 11 facing the flange body 2, and the flange body 2 has a second end face 21 facing the flange cover 1. A raised ring 3 is concentrically arranged on the first end face 11, and an annular groove 4 is concentrically arranged on the second end face 21. A sealing element 5 is placed in the annular groove 4, and the raised ring 3 is embedded in the annular groove 4 and abuts against the sealing element 5.

[0034] In this way, the convex ring 3 and the annular groove 4 cooperate to form a tongue and groove structure. After the flange body 2 and flange cover 1 are locked with bolts and nuts, the sealing element 5, which is housed in the annular groove 4, can be limited by the convex ring 3 and the annular groove 4, effectively preventing the sealing element 5 from shifting position under high pressure and improving the overall sealing performance of the sealing structure. At the same time, the annular groove 4 can provide space for the expansion and contraction of the sealing element 5, effectively preventing the sealing element 5 from being damaged under large bolt preload and extending the service life of the sealing structure. In specific design, the depth of the annular groove 4 can be flexibly set according to the expansion and contraction of the sealing element 5.

[0035] In this embodiment, combined with Figure 2As shown, the convex ring 3 includes a first ring body 31 and a second ring body 32 that are concentrically arranged and have gradually increasing diameters, and the ring groove 4 includes a first groove body 41 and a second groove body 42 that are concentrically arranged and have gradually increasing diameters. The first ring body 31 is embedded in the first groove body 41, and the second ring body 32 is embedded in the second groove body 42.

[0036] The sealing element 5 includes a first sealing body 51 housed in a first groove 41 and a second sealing body 52 housed in a second groove 42. A first ring 31 presses against the first sealing body 51 and a second ring 32 presses against the second sealing body 52.

[0037] The first sealing body 51 and the second sealing body 52, respectively housed in the first groove 41 and the second groove 42, can achieve double sealing of the high-pressure vessel, effectively improving the sealing effect; while the first ring body 31 and the second ring body 32 can respectively abut against the first sealing body 51 and the second sealing body 52, preventing the first sealing body 51 and the second sealing body 52 from shifting position.

[0038] In this embodiment, combined with Figure 3 As shown, the first sealing body 51 includes a deformable sealing body 511, a sealing groove 512 formed on the sealing body 511, and a first elastic body 513 housed in the sealing groove 512. The first elastic body 513 has two elastic ends 514, which respectively abut against the two side walls of the sealing groove 512. The sealing body 511 is annular, the sealing groove 512 is circumferentially formed on the inner side of the sealing body 511, and the first elastic body 513 is annular with its centerline coinciding with the centerline of the sealing body 511. The two elastic ends 514 can tightly fit the sealing body 511 onto the first annular body 31 and the first groove 41, forming the first seal of the sealing structure of this application, resulting in a good sealing effect.

[0039] Among them, the sealing body 511 is a jacket made of polymer material, which can be PTFE, filled PTFE, PEEK, filled PEEK, PVDF, PPS or other high-performance polymer materials.

[0040] In this embodiment, the first elastic body 513 includes an outer spring 5131 and an inner spring 5132. Both the outer spring 5131 and the inner spring 5132 are V-shaped and each has a V-shaped opening. The inner spring 5132 is housed in the opening of the outer spring 5131. The two ends of the outer spring 5131 and the two ends of the inner spring 5132 are connected to each other to form two elastic ends 514. The first elastic body 513 can output better rebound performance with the cooperation of the outer spring 5131 and the inner spring 5132, further improving the sealing effect of the first sealing body 51.

[0041] Both the outer spring 5131 and the inner spring 5132 are nickel alloy springs. When the inner spring 5132 is housed in the opening of the outer spring 5131, it is slightly compressed so that it can remain in a rebound state, thereby providing the first elastic body 513 with better rebound performance.

[0042] In this embodiment, two sealing lips 515 are integrally formed on the sealing body 511, and a sealing groove 512 is formed between the two sealing lips 515. Each sealing lip 515 includes a lip body 5151. The ends of the two lip bodies 5151 are bent toward each other to form two limiting portions 5152. Two elastic ends 514 abut against the two limiting portions 5152 respectively.

[0043] The two sealing lips 515 can press against the first ring body 31 and the first groove body 41 under the action of the two elastic ends 514, effectively improving the sealing effect. The limiting part 5152 can prevent the first elastic body 513 from falling out of the sealing groove 512 during use, thus extending the service life of the first sealing body 51.

[0044] In this embodiment, combined with Figure 4 As shown, the second sealing body 52 includes a second elastic body 521 and a sealing layer 522 covering the second elastic body 521. The second elastic body 521 is a rubber ring, and the sealing layer 522 is a polymer material coating layer, which can be made of PTFE. The rubber ring can improve excellent resilience, while the PTFE coating layer can improve excellent sealing performance. The combination of the two can form the second seal of this application, resulting in a good sealing effect.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing structure for a high-pressure vessel, comprising a flange body (2) and a flange cover (1) coaxially connected, characterized in that: The flange cover (1) has a first end face (11) facing the flange body (2), and the flange body (2) has a second end face (21) facing the flange cover (1). A protruding ring (3) is provided on one of the first end face (11) and the second end face (21), and an annular groove (4) is provided on the other end face. A sealing element (5) is placed in the annular groove (4), and the protruding ring (3) is embedded in the annular groove (4) and abuts against the sealing element (5).

2. The sealing structure for a high-pressure vessel according to claim 1, characterized in that: The convex ring (3) is concentrically disposed on the first end face (11), and the annular groove (4) is concentrically disposed on the second end face (21).

3. A sealing structure for a high-pressure vessel according to claim 1 or 2, characterized in that: The convex ring (3) includes a first ring body (31) and a second ring body (32) arranged concentrically and with gradually increasing diameter. The ring groove (4) includes a first groove body (41) and a second groove body (42) arranged concentrically and with gradually increasing diameter. The first ring body (31) is embedded in the first groove body (41), and the second ring body (32) is embedded in the second groove body (42).

4. A sealing structure for a high-pressure vessel according to claim 3, characterized in that: The sealing element (5) includes a first sealing body (51) housed in the first groove (41) and a second sealing body (52) housed in the second groove (42), wherein the first ring (31) presses against the first sealing body (51) and the second ring (32) presses against the second sealing body (52).

5. A sealing structure for a high-pressure vessel according to claim 4, characterized in that: The first sealing body (51) includes a deformable sealing body (511), a sealing groove (512) formed on the sealing body (511), and a first elastic body (513) housed in the sealing groove (512). The first elastic body (513) has two elastic ends (514), which abut against the two side walls of the sealing groove (512).

6. A sealing structure for a high-pressure vessel according to claim 5, characterized in that: The sealing body (511) is annular, the sealing groove (512) is circumferentially opened on the inner side of the sealing body (511), and the first elastic body (513) is annular and its center line coincides with the center line of the sealing body (511).

7. A sealing structure for a high-pressure vessel according to claim 5, characterized in that: The first elastic body (513) includes an outer spring (5131) and an inner spring (5132). Both the outer spring (5131) and the inner spring (5132) are V-shaped and each has a V-shaped opening. The inner spring (5132) is housed in the opening of the outer spring (5131). The two ends of the outer spring (5131) are connected to the two ends of the inner spring (5132) respectively to form the two elastic ends (514).

8. A sealing structure for a high-pressure vessel according to claim 5, characterized in that: The sealing body (511) has two sealing lips (515) integrally formed, the sealing groove (512) is formed between the two sealing lips (515), and the two elastic ends (514) respectively abut against the two sealing lips (515).

9. A sealing structure for a high-pressure vessel according to claim 8, characterized in that: Each of the sealing lips (515) includes a lip body (5151), and the ends of the two lip bodies (5151) are bent toward each other to form two limiting portions (5152), and the two elastic ends (514) abut against the two limiting portions (5152).

10. A sealing structure for a high-pressure vessel according to claim 4, characterized in that: The second sealing body (52) includes a second elastic body (521) and a sealing layer (522) covering the second elastic body (521).

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