Ultrahigh pressure sealing assembly and sealing device

Abstract

The utility model discloses an ultrahigh pressure sealing assembly and a sealing device, the sealing assembly comprises a sealing ring and a supporting ring, the supporting ring is annularly arranged on the outer side of the sealing ring along the circumferential direction, the supporting ring is provided with a supporting surface facing the sealing ring, the supporting surface is an arc-shaped surface which is recessed outwards along the radial direction, and the supporting ring is provided with a sealing ring. The sealing ring at least has the sealing state of being extruded in the axial direction, and in the sealing state, the outer side circumferential face of the sealing ring abuts against the supporting face and makes face contact with the supporting face, so that the sealing ring can effectively keep the arc-shaped state of the outer side circumferential portion, the sealing ring is prevented from being crushed and deformed, and the sealing performance of the sealing ring is improved. Meanwhile, the sealing ring can bear larger load, sealing failure is avoided, sealing reliability is improved, and the sealing requirement of the ultrahigh pressure environment can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a sealing component and a sealing device, and in particular to a sealing component and a sealing device suitable for an ultra-high pressure environment. Background Art

[0002] At present, seals used in ultra-high pressure environments with loads above 100MPa are usually made of polymer materials such as plastics and rubber, but their main disadvantage is that they cannot withstand high temperatures. For example, if the temperature exceeds 250°C, few materials can meet the sealing requirements of such ultra-high pressure. In addition, most polymer materials have poor radiation resistance and are prone to material performance degradation, which affects the service life of the seals. Seals used in high-temperature environments generally use metal sealing rings, such as metal flat gaskets, but their main disadvantage is that metal flat gaskets have high rigidity and small self-deformation, making it difficult to form an effective sealing mating surface with the flange sealing surface, and are difficult to process for seals and equipment.

[0003] C-type sealing rings made of metal materials can meet the sealing requirements of high temperature and high pressure environments at the same time. In the prior art, common metal C-type sealing rings are mainly composed of a metal substrate and a soft metal layer on the surface. For example, a typical C-type sealing ring is made of a nickel-based high-temperature alloy substrate with silver plating on the surface. In order to increase the sealing stress, elastic elements such as filling springs and filling O-type rubber rings are filled inside the C-type ring. The C-type sealing ring produces compression deformation during installation to provide the necessary sealing load, and can provide sufficient rebound and continuous load when the clamping load fluctuates. The soft metal layer on the surface undergoes plastic deformation during the compression process and meshes with the flange sealing surface. Therefore, the C-type sealing ring is widely used in high-pressure and ultra-high-pressure sealing conditions.

[0004] However, when the C-shaped sealing ring 3' is installed in the flange sealing groove 21', Figure 1 As shown, during the assembly process, under the action of the bolt load, the circular shape of the C-shaped sealing ring 3' changes to an elliptical shape. At this time, the upper end face and the lower end face of the C-shaped sealing ring 3' are in contact with the end faces of the upper flange 1' and the lower flange 2' respectively, and the outer end face of the C-shaped sealing ring 3' is in contact with the outer wall of the flange groove 21'. Under the action of the ultra-high pressure medium, the arc-shaped cross-section of the C-shaped sealing ring 3' is easily deformed by high pressure extrusion, and changes from an elliptical shape to a square shape, as shown in FIG. Figure 2 , Figure 3 As shown, the seal fails.

[0005] Therefore, it is necessary to provide a new sealing assembly and sealing device to improve the sealing reliability of the C-type sealing ring. Utility Model Content

[0006] The utility model aims to provide a new sealing component to improve the sealing reliability when the sealing component is used in a sealing device, especially in a sealing device under an ultra-high pressure environment.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a sealing assembly, which includes a sealing ring and a support ring, wherein the support ring is circumferentially arranged on the outside of the sealing ring, and the support ring has a support surface facing the sealing ring, and the support surface is an arc-shaped surface that is concave radially outward, and the sealing ring has at least a sealing state of being squeezed in the axial direction. In the sealing state, the outer circumferential surface of the sealing ring abuts against the support surface and is in surface contact with the support surface.

[0008] In some embodiments, the sealing ring has a hollow cavity, and the inner peripheral portion of the sealing ring is also provided with an opening extending through along the circumferential direction, and the opening is connected to the hollow cavity.

[0009] In some embodiments, the sealing assembly further includes an elastic element disposed in the hollow cavity and capable of axial deformation.

[0010] In some embodiments, the sealing ring has a C-shaped cross section, and has an opening located on the inner peripheral portion and extending therethrough in the circumferential direction.

[0011] In some embodiments, the sealing ring further has an initial state, in which a gap is set between the outer peripheral surface of the sealing ring and the supporting surface.

[0012] In some embodiments, the height of the sealing ring in the initial state is greater than the height of the supporting ring, and the height of the sealing ring in the sealing state is equal to or slightly greater than the height of the supporting ring.

[0013] In some embodiments, the support ring is made of metal; the sealing ring includes a substrate made of metal, and a silver layer plated on the outer surface of the substrate.

[0014] Another object of the utility model is to provide a new sealing device, which includes a first component having a first sealing surface, a second component having a second sealing surface, and a sealing assembly for axial sealing between the first sealing surface and the second sealing surface, at least one of the first component and the second component is provided with a mounting groove, the sealing assembly is arranged in the mounting groove and is axially located between the first component and the second component, the sealing assembly is as described above, wherein the sealing ring is axially extruded between the first component and the second component and is used for sealing between the first sealing surface and the second sealing surface.

[0015] In some embodiments, an inner peripheral wall of the mounting groove is spaced apart from an inner peripheral portion of the sealing ring, and an outer peripheral wall of the mounting groove cooperates with an outer peripheral wall of the support ring.

[0016] In some embodiments, the mounting groove is provided on one of the first component and the second component, the height of the support ring is smaller than the height of the mounting groove, and at least one of the first component and the second component has a medium cavity.

[0017] Due to the application of the above technical scheme, the utility model has the following advantages compared with the prior art: in the sealing assembly and the sealing device, a support ring is arranged on the outer side of the sealing ring, and when the sealing ring is squeezed in the axial direction and converted into a sealing state, its outer peripheral portion can abut against the supporting surface of the inner peripheral portion of the support ring, so that the arc surfaces of the two are in contact, which enables the sealing ring to effectively maintain the arc state of the outer peripheral portion to avoid the sealing ring being crushed and deformed, and also enables the sealing ring to withstand a larger load, avoid sealing failure, ensure the reliability of the seal, and meet the sealing requirements under ultra-high pressure environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] It should be noted that the following figure is not drawn according to the actual scale, but is only used to illustrate the main structure of each component in the sealing assembly and its matching relationship in the sealing device.

[0020] Attached Figure 1 It is a schematic diagram of a C-type sealing ring used in a flange sealing device in the prior art, wherein the C-type sealing ring is in a normal state;

[0021] Attached Figure 2 For attachment Figure 1 A structural diagram of a damage form of a C-type sealing ring in a flange sealing device;

[0022] Attached Figure 3 For attachment Figure 1 A schematic diagram of another form of damage to the C-type sealing ring in the flange sealing device;

[0023] Attached Figure 4 This is a schematic cross-sectional structure diagram of a sealing assembly according to an embodiment of the present utility model;

[0024] Attached Figure 5 For attachment Figure 4A schematic diagram of the cooperation between the sealing assembly and the mounting groove in the sealing device;

[0025] Attached Figure 6 This is a schematic cross-sectional structure diagram of a sealing assembly according to another embodiment of the present utility model;

[0026] Attached Figure 7 For attachment Figure 4 Schematic diagram of the dimensions of the support ring in the sealing assembly;

[0027] Attached Figure 8 For attachment Figure 4 Dimensional diagram of a support ring and a sealing ring in a sealing assembly;

[0028] Attached Fig. 9 This is a schematic structural diagram of a support ring according to an embodiment;

[0029] Attached Fig.10 For the attached Figure 4 A schematic structural diagram of a sealing device of a sealing assembly, wherein the sealing assembly is in a sealed state;

[0030] Wherein: 1', upper flange; 2', lower flange; 21', flange groove; 3', C-type sealing ring; 10, sealing assembly; 20, first component; 201, first sealing surface; 202, mounting groove; 30, second component; 301, second sealing surface; 1, sealing ring; 11, hollow cavity; 12, opening; 2, support ring; 21, support surface; 3, elastic element. DETAILED DESCRIPTION

[0031] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the utility model can be more easily understood by those skilled in the art. Obviously, the embodiments described in this application are only part of the embodiments of the application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0032] See also Figure 4A sealing assembly 10 is shown, and the sealing assembly 10 includes a sealing ring 1 and a supporting ring 2. The supporting ring 2 is circumferentially arranged on the outer side of the sealing ring 1. The supporting ring 2 has a supporting surface 21 facing the sealing ring 1, and the supporting surface 21 is an arc-shaped surface that is concave radially outward. The sealing ring 1 has at least a sealing state of being squeezed in the axial direction. When the sealing assembly 10 is installed in a sealing device for sealing connection, the sealing ring 1 is squeezed in the axial direction and is in the above-mentioned sealing state. When the sealing ring 1 is in this sealing state, the outer peripheral surface of the sealing ring 1 abuts against the supporting surface 21 and is in surface contact with the supporting surface 21, which enables the outer peripheral portion of the sealing ring 1 to maintain surface contact with the supporting ring 2, thereby expanding the contact area, so that the sealing ring 1 can withstand a larger load and is not easily crushed and deformed, thereby avoiding sealing failure.

[0033] See also Fig.10 A sealing device is shown, which includes a first component 20 having a first sealing surface 201, a second component 30 having a second sealing surface 301, and a sealing assembly 10 for axial sealing between the first sealing surface 201 and the second sealing surface 301. A mounting groove 202 is provided on at least one of the first component 20 and the second component 30, and the sealing assembly 10 is arranged in the mounting groove 202 and is axially located between the first component 20 and the second component 30, wherein the mounting groove 202 is specifically arranged on the first component 20, and at least one of the first component 10 and the second component 20 has a medium cavity, and the sealing assembly 10 is located on the circumferential outer side of the medium cavity to prevent the medium in the medium cavity from leaking outward from between the first sealing surface 201 and the second sealing surface 301.

[0034] In the Figure 4 After the sealing assembly 10 shown is installed in the mounting groove 202, the first component 20 and the second component 30 are pressed axially, so that when the sealing assembly 10 is squeezed between the first component 20 and the second component 30, the sealing ring 1 is squeezed axially and is in a sealed state, and its two axial end surfaces respectively contact the second sealing surface 301 and the bottom groove wall of the mounting groove 202, that is, a seal is formed between the first sealing surface 201 and the second sealing surface 301.

[0035] In the sealing assembly 10, the sealing ring 1 has a hollow cavity 11, and the inner peripheral portion of the sealing ring 1 is also provided with an opening 12 extending through the circumferential direction, and the opening 12 is connected to the hollow cavity 11. The sealing assembly 10 is used in a sealing device, and the medium can enter the hollow cavity 11 through the opening 12, so that the inside of the sealing ring 1 provides an outward force under the action of the medium. That is, the sealing ring 1 has a self-enhancing effect of the medium pressure. The higher the medium pressure, the greater the sealing contact stress, and the better the sealing performance.

[0036] For example Figure 6In another sealing assembly 10 shown, the sealing assembly 10 also includes an elastic element 3 disposed in the hollow cavity 11 and capable of axial deformation. The elastic element 3 can specifically be a cylindrical spring. The elastic element 3 is axially supported in the hollow cavity 11 of the sealing ring 1, so that the sealing ring 1 can withstand a larger axial load.

[0037] Specifically, in this embodiment, the cross section of the sealing ring 1 is C-shaped, and the opening 12 is provided on the inner peripheral portion of the sealing ring 1 and extends through the circumferential direction, that is, the sealing ring 1 is preferably a C-shaped ring. The sealing ring 1 adopts a C-shaped ring, which solves the problem of high temperature adaptability, and the sealing ring 1 itself has good compression and rebound characteristics, and can well adapt to the processing texture and slight deformation of the position to be sealed in the first component 20 and the second component 30 in the equipment. Here, the support ring 2 is made of metal material, and the sealing ring 1 includes a substrate made of metal material, and a silver layer plated on the outer surface of the above substrate.

[0038] The sealing ring 1 also has an initial state, which is the state in which the sealing ring 1 has not been squeezed in the axial direction. In the initial state, the outer peripheral surface of the sealing ring 1 is set with a gap between the support surface 21, and the height of the sealing ring 1 in the initial state is greater than the height of the support ring 2, and the height of the sealing ring 1 in the sealed state is equal to or slightly greater than the height of the support ring 2. In this way, when the sealing ring 1 is squeezed in the axial direction and converted to the sealed state, the height of the sealing ring 1 is reduced and the outer diameter is increased, and the outer peripheral portion of the sealing ring 1 moves radially outward and abuts against the support surface 21, and the gap between the two provides space for the sealing ring 1 to deform in the radial direction; at the same time, in the sealed state, the two axial end faces of the sealing ring 1 are slightly higher than the axial end faces of the support ring 2, or are flush with the axial end faces of the support ring 2, which can ensure that the axial end faces on both sides of the sealing ring 1 are combined with the surface to be sealed to play a sealing role.

[0039] Specifically, see Figures 4 to 8 As shown, the outer diameter of the support ring 2 is φdo, the inner diameter is φdi, and the height is W; the outer diameter of the sealing ring 1 in the initial state is φdc, where φdc<φdi. In the sealing device, the height of the mounting groove 202 is H, H≥W; the outer diameter of the mounting groove 202 is also φdo, and the inner diameter of the mounting groove 202 is smaller than the inner diameter of the sealing ring 1. In some embodiments, the support ring 2 can be formed by splicing two arc rings along the circumferential direction, such as Fig. 9 As shown, this makes it easier to process and install the support ring 2.

[0040] When the sealing assembly 10 is installed in the mounting groove 202, the outer peripheral portion of the support ring 2 and the outer groove wall of the mounting groove 202 are in contact with each other, and their height is not higher than the depth of the mounting groove 202; there is a distance between the inner peripheral portion of the sealing ring 1 and the mounting groove 202, and the sealing ring 1 is in a sealed state under the axial extrusion of the first component 20 and the second component 30. It is compressed in the axial direction and increases along the outer diameter, so that the outer peripheral portion of the sealing ring 1 and the supporting surface 21 of the support ring 2 fit each other to achieve arc surface contact.

[0041] The test confirmed that the sealing assembly 10 has no leakage when used in a sealing environment with a water pressure test pressure of 380 MPa, the sealing ring 1 and the support ring 2 can remain intact, and the corresponding sealing equipment can maintain long-term operation. It can be seen that the sealing assembly 10 can be used in high-pressure and ultra-high-pressure sealing environments, and can meet the sealing requirements in high-temperature and high-pressure environments at the same time.

[0042] In summary, the sealing assembly 10 provided by the embodiment of the utility model, when used in a sealing device, when the sealing ring 1 is subjected to axial extrusion force and converted to a sealing state, its outer peripheral surface can be against the arc-shaped support surface 21, thereby increasing the contact area of ​​the outer peripheral portion of the sealing ring 1 in the sealing state, which enables the sealing ring 1 to effectively maintain the arc state of the outer peripheral portion, avoiding the sealing ring 1 from being crushed and deformed, and also enables the sealing ring 1 to withstand a larger load, avoiding sealing failure, and improving the reliability of the seal. By adding a support ring 2 as a contoured ring structure in the sealing assembly 10, the application of the C-type sealing ring can be expanded to ultra-high pressure conditions above 100MPa, and its sealing effect can be guaranteed, reducing the risk of leakage, which has reference significance for the design and transformation of ultra-high pressure systems, and is conducive to improving the safety and environmental protection level of enterprises.

[0043] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing assembly, characterized in that: The sealing assembly includes a sealing ring and a support ring, wherein the support ring is circumferentially arranged on the outer side of the sealing ring, and the support ring has a support surface facing the sealing ring, and the support surface is an arcuate surface that is concave radially outward. The sealing ring has at least a sealing state of being squeezed in the axial direction, and in the sealing state, the outer peripheral surface of the sealing ring abuts against the support surface and is in surface contact with the support surface.

2. The sealing assembly according to claim 1, characterized in that: The sealing ring has a hollow cavity, and the inner peripheral portion of the sealing ring is also provided with an opening extending through the circumferential direction, and the opening is connected to the hollow cavity.

3. The sealing assembly according to claim 2, characterized in that: The sealing assembly further comprises an elastic element which is arranged in the hollow cavity and can be deformed in the axial direction.

4. The sealing assembly according to claim 1, characterized in that: The sealing ring has a C-shaped cross section and has an opening located on the inner peripheral portion and extending through the ring in the circumferential direction.

5. The sealing assembly according to claim 1, characterized in that: The sealing ring also has an initial state, in which a gap is set between the outer peripheral surface of the sealing ring and the supporting surface.

6. The sealing assembly according to claim 5, characterized in that: The height of the sealing ring in the initial state is greater than the height of the supporting ring, and the height of the sealing ring in the sealing state is equal to or slightly greater than the height of the supporting ring.

7. The sealing assembly according to claim 1, characterized in that: The support ring is made of metal material; the sealing ring comprises a base body made of metal material and a silver layer plated on the outer surface of the base body.

8. A sealing device, comprising a first component having a first sealing surface, a second component having a second sealing surface, and a sealing assembly for axially sealing between the first sealing surface and the second sealing surface, wherein at least one of the first component and the second component is provided with a mounting groove, the sealing assembly is arranged in the mounting groove and is axially located between the first component and the second component, characterized in that: The sealing assembly as claimed in any one of claims 1 to 7, wherein the sealing ring is pressed between the first component and the second component in the axial direction to seal between the first sealing surface and the second sealing surface.

9. The sealing device according to claim 8, characterized in that: The inner peripheral wall of the installation groove is spaced apart from the inner peripheral portion of the sealing ring, and the outer peripheral wall of the installation groove is matched with the outer peripheral wall of the support ring.

10. The sealing device according to claim 8, characterized in that: The mounting groove is provided on one of the first component and the second component, the height of the support ring is smaller than the height of the mounting groove, and at least one of the first component and the second component has a medium cavity.

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