Bidirectional pressure-bearing low-temperature sealing structure

Abstract

The utility model relates to a bidirectional pressure-bearing low-temperature sealing structure. The sealing structure comprises a sealing ring, an upper coating layer, a lower coating layer, an upper flange and a lower flange. The sealing ring main body is annular, the cross section of the sealing ring main body is H-shaped, the upper coating layer and the lower coating layer are sleeved on the outer surface of the sealing ring, and the sealing ring, the upper coating layer and the lower coating layer are arranged between the upper flange and the lower flange. According to the two-way pressure-bearing low-temperature sealing structure, the upper wrapping layer and the lower wrapping layer are pressed through elastic deformation of the sealing ring after installation and pressure bearing, the wrapping layers make contact with the flange to form an inner sealing face and an outer sealing face, the two-way pressure-bearing low-temperature sealing structure is suitable for two-way pressure-bearing sealing in a low-temperature medium, the sealing effect is ensured, and the good engineering application prospect is achieved.

Description

Technical Field

[0001] The utility model relates to a two-way pressure-bearing low-temperature sealing structure, belonging to the field of sealing structures. Background Art

[0002] At present, the traditional low-temperature sealing structure can only achieve single-way pressure-bearing. That is, when there is pressure on one side of the sealing structure, good sealing performance can be maintained. However, for the cryogenic storage tank of a launch vehicle, due to its complex operating conditions, the sealing surface of the storage tank has a low-temperature and two-way pressure-bearing working environment. The requirements for the sealing structure include: reliable connection, meeting the working environment where there is pressure on both sides of the sealing structure; good adaptability, requiring the working temperature of the sealing structure to reach up to 323K at the highest and down to 77K at the lowest; reliable sealing, requiring the gas leakage rate at the sealing structure to be lower than 1.0×10-4 Pa·m3 / s; convenient installation, requiring the sealing structure to be easy to disassemble and install.

[0003] If a traditional single-way pressure-bearing low-temperature sealing structure is adopted, then in the two-way pressure-bearing working condition, it may cause deformation of the sealing structure and result in sealing failure. Therefore, providing a two-way pressure-bearing low-temperature sealing structure to overcome the drawbacks of the existing sealing structure and ensure good sealing performance and stability is an urgent technical problem in this field at present. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: overcoming the deficiencies of the prior art and providing a two-way pressure-bearing low-temperature sealing structure.

[0005] The technical solution of the utility model is: a two-way pressure-bearing low-temperature sealing structure, including: a sealing ring, an upper covering layer, a lower covering layer, an upper flange, and a lower flange;

[0006] The sealing ring is annular and has an H-shaped cross-section; the upper covering layer is sleeved on the upper surface of the sealing ring, and the lower covering layer is sleeved on the lower surface of the sealing ring, also being an annular structure, and the cross-sectional shape adapts to the contour of the sealing ring; the sealing ring, the upper covering layer, and the lower covering layer form a sealing main body structure, which is arranged between the upper flange and the lower flange.

[0007] Preferably, the cross-section of the sealing ring is symmetric about the left and right, with a solid ring part in the middle, and grooves are provided at the middle positions of the upper and lower surfaces of the sealing main body structure; the cavities on the left and right sides of the solid ring part are the inner cavities; and lips are provided at the four end edges of the H-shaped cross-section of the sealing main body structure.

[0008] Preferably, the upper flange and the lower flange are annular structures, and a sealing groove is provided on the lower surface of the upper flange and the upper surface of the lower flange, and a boss is provided in the middle of the sealing groove, and the boss cooperates with the groove of the sealing main body structure: the bosses of the upper flange and the lower flange are embedded in the grooves of the sealing main body structure;

[0009] The lip contacts with the sealing groove to form a sealing surface.

[0010] Preferably, the height M1 of the sealing main body structure in the free state is greater than the sum M2 of the depths of the two sealing grooves of the upper flange and the lower flange; a gap is formed between the upper flange and the lower flange.

[0011] Preferably, after the gas or liquid cryogenic medium enters the inner cavity of the sealing main body structure from the gap between the inner circles of the upper flange and the lower flange, the medium pressure pushes the lip of the sealing main body structure to continue to expand towards the sealing groove, and the load of the sealing surface increases.

[0012] The utility model has the following advantages compared with the prior art:

[0013] (1) The utility model provides a two-way pressure-bearing cryogenic sealing structure. After the sealing ring and the coating layer are installed, they are extruded by the sealing groove surfaces of the upper flange and the lower flange, causing the metal edge of the sealing ring to undergo elastic deformation and having a tendency to expand towards the sealing groove. A load is generated on the sealing surface, and the coating layer is pressed tightly to achieve initial sealing; after the gas or liquid cryogenic medium enters the inner cavities on both sides of the sealing ring from the gap between the upper flange and the lower flange, a medium pressure is generated, pushing the lip of the sealing ring to continue to expand towards the sealing groove, increasing the load of the sealing surface, and further enhancing the sealing performance, thereby realizing two-way pressure-bearing cryogenic sealing and improving the sealing and stability of the structure;

[0014] (2) In the utility model, the convex platforms in the middle of the sealing grooves of the upper flange and the lower flange are embedded into the grooves of the sealing ring and the coating layer, preventing the sealing ring and the coating layer from moving due to excessive inner cavity pressure during use, thereby effectively avoiding the sealing failure caused by the deformation of the sealing structure.

[0015] (3) The working temperature of the sealing structure proposed by the utility model is 77K - 323K, and the working pressure can reach 2MPa, applicable to gas or liquid media, improving the adaptability of the sealing structure. Description of the Drawings

[0016] Figure 1 is a partial installation schematic diagram of the two-way pressure-bearing cryogenic sealing structure of the utility model;

[0017] Figure 2 is an installation schematic diagram of the two-way pressure-bearing cryogenic sealing structure of the utility model;

[0018] Figure 3 is a three-dimensional cross-sectional view of the sealing ring and the coating layer of the utility model.

[0019] The reference numerals include:

[0020] 1 - sealing ring, 2 - upper coating layer, 3 - lower coating layer, 4 - upper flange, 5 - lower flange, 6 - inner cavity, 7 - solid ring part, 8 - lip, 9 - groove, 10 - sealing groove, 11 - convex platform, 12 - sealing surface, 13 - gap. Detailed implementation manners

[0021] The following clearly and completely describes the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model.

[0022] As Figure 1 、 Figure 2 and Figure 3 shown, the embodiment of the present invention provides a bidirectional pressure-bearing low-temperature sealing structure, which includes a sealing ring 1, an upper cladding layer 2, a lower cladding layer 3, an upper flange 4, and a lower flange 5. The main body of the sealing ring 1 is annular, and the cross-section is H-shaped. The upper cladding layer 2 and the lower cladding layer 3 are respectively sleeved on the upper and lower surfaces of the sealing ring 1. The upper cladding layer 2 and the lower cladding layer 3 are annular structures, and the cross-sectional shapes are adapted to the outer contour of the sealing ring 1. The sealing ring 1, the upper cladding layer 2, and the lower cladding layer 3 form a main sealing structure, which is arranged between the upper flange 4 and the lower flange 5.

[0023] To further optimize the above solution, GH4169 superalloy is selected as the material of the sealing ring 1, perfluoroethylene-propylene is selected as the material of the upper cladding layer 2 and the lower cladding layer 3, and 5A06 aluminum alloy is selected as the material of the upper flange 4 and the lower flange 5;

[0024] Specifically, the cross-section of the sealing ring 1 is symmetric about the left and right, and the middle is a solid ring part 7. Grooves 9 are provided at the middle positions of the upper and lower surfaces of the solid ring part 7. The contours of the corresponding upper cladding layer 2 and lower cladding layer 3 change accordingly, that is: grooves 9 are provided at the middle positions of the upper and lower surfaces of the main sealing structure; the cavities formed on the left and right sides of the solid ring part 7 are the inner cavities 6; lips are provided at the four end edges of the sealing ring 1, and the contours of the corresponding upper cladding layer 2 and lower cladding layer 3 change accordingly, that is: lips 8 are provided at the end edges of the H-shaped cross-section of the main sealing structure. As Figure 1 shown: the cross-section of the main sealing structure formed by the sealing ring 1, the upper cladding layer 2, and the lower cladding layer 3 is H-shaped, inner cavities 6 are formed on both sides of the solid ring part 7, lips 8 are provided at the four ends of the H-shaped main sealing structure, and two grooves 9 are provided at the middle of the upper and lower surfaces.

[0025] As Figure 1 and Figure 2As shown in the figure: The upper flange 4 and the lower flange 5 are annular structures. A sealing groove 10 is provided on the lower surface of the upper flange 4 and the upper surface of the lower flange 5, and a boss 11 is provided in the middle of the sealing groove 10; the lip 8 contacts the sealing groove 10 to form a sealing surface 12; the total height of the upper covering layer 2 and the lower covering layer 3 of the sealing ring 1 in the free state, that is, the height M1 of the sealing main structure in the free state, is greater than the sum M2 of the depths of the two sealing grooves 10 of the upper flange 4 and the lower flange 5, forming a gap 13 left between the upper flange 4 and the lower flange 5; in this embodiment, the maximum height of the upper covering layer 2, the lower covering layer 3 and the sealing ring 1 in the free state is 5.25 mm, which is greater than the sum 4.4 mm of the depths of the two sealing grooves 10 of the upper flange 4 and the lower flange 5.

[0026] In a bidirectional pressure-bearing low-temperature sealing structure provided by an embodiment of the present invention, after the sealing ring 1, the upper covering layer 2, and the lower covering layer 3 are installed, they are extruded by the forming surfaces of the sealing grooves 10 of the upper flange 4 and the lower flange 5. The extrusion deformation amount is close to the difference between the height M1 of the sealing main structure in the free state and the sum M2 of the depths of the two sealing grooves 10 of the upper flange 4 and the lower flange 5. In this embodiment, the extrusion deformation amount is 0.85 mm, which causes elastic deformation of the lips 8 at the four ends of the sealing main structure, with a tendency to expand towards the sealing grooves 10, generating a load on the sealing surface 12, and the upper covering layer 2 and the lower covering layer 3 are pressed tightly to achieve initial sealing; when a gas or liquid low-temperature medium enters the two side cavities 6 from the gap 13 in the inner ring between the upper flange 4 and the lower flange 5, a medium pressure is generated, pushing the lips 8 to continue to expand towards the sealing grooves 10, increasing the load on the sealing surface 12, and further enhancing the sealing performance, thereby achieving bidirectional pressure-bearing low-temperature sealing.

[0027] In an embodiment of the present invention, the boss 11 of the upper flange 4 and the lower flange 5 is embedded in the groove 9 jointly formed by the sealing ring 1, the upper covering layer 2, and the lower covering layer 3 to prevent the sealing ring 1, the upper covering layer 2, and the lower covering layer 3 from moving due to excessive internal cavity pressure during use.

[0028] The specific embodiments of the present invention have been described above. The present invention is not limited by the described embodiments. The present invention can be further understood through specific implementation manners. Those skilled in the technical field to which the present invention belongs make some non-essential adjustments and improvements to the present invention based on the content of the invention. All other embodiments obtained without departing from the spirit and scope of the present invention belong to the scope of protection of the present invention.

[0029] The content not described in detail in the specification of the present utility model belongs to the prior art well-known to those skilled in the art.

Claims

1. A two-way pressure-bearing low-temperature sealing structure, characterized in that Including: Sealing ring (1), upper covering layer (2), lower covering layer (3), upper flange (4), lower flange (5); The sealing ring (1) is annular and has an H-shaped cross-section; the upper covering layer (2) is sleeved on the upper surface of the sealing ring (1), and the lower covering layer (3) is sleeved on the lower surface of the sealing ring (1), also in an annular structure, and the cross-sectional shape adapts to the contour of the sealing ring (1); the sealing ring (1), upper covering layer (2), and lower covering layer (3) form a main sealing structure, which is arranged between the upper flange (4) and the lower flange (5).

2. The double-direction pressure-bearing low-temperature sealing structure according to claim 1, wherein: The cross-section of the sealing ring (1) is symmetric left and right, with a solid ring part (7) in the middle, and grooves (9) are provided at the middle positions of the upper and lower surfaces of the main sealing structure; the cavities on both sides of the solid ring part (7) are the inner cavities (6); lips (8) are provided at the four end edges of the H-shaped cross-section of the main sealing structure.

3. A two-way pressure-bearing low-temperature sealing structure according to claim 2, characterized in that: The upper flange (4) and the lower flange (5) are annular structures. A sealing groove (10) is provided on the lower surface of the upper flange (4) and the upper surface of the lower flange (5), and a boss (11) is provided in the middle of the sealing groove (10). The boss (11) cooperates with the groove (9) of the main sealing structure: the bosses (11) of the upper flange (4) and the lower flange (5) are embedded in the groove (9) of the main sealing structure; The lips (8) contact the sealing groove (10) to form a sealing surface (12).

4. The double-direction pressure-bearing low-temperature sealing structure according to claim 3, wherein: The height M1 of the main sealing structure in the free state is greater than the sum M2 of the depths of the two sealing grooves (10) of the upper flange (4) and the lower flange (5); a gap (13) is formed between the upper flange (4) and the lower flange (5).

5. The two-way pressure-bearing low-temperature sealing structure according to claim 4, characterized in that: After the gas or liquid cryogenic medium enters the inner cavity (6) of the main sealing structure from the gap (13) inside the upper flange (4) and the lower flange (5), the medium pressure pushes the lips (8) of the main sealing structure to continue to expand towards the sealing groove (10), and the load of the sealing surface (12) increases.

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