Sealing assembly and connecting structure

Abstract

The invention provides a sealing assembly and a connecting structure. The sealing assembly is used for connecting a first connecting piece and a second connecting piece in a sealing mode and comprises at least one main body sealing ring. Each body seal ring has an outer side and an inner side. A first auxiliary sealing piece is annularly arranged on the outer side face, at least closest to the first connecting piece, of the main body sealing ring, and a second auxiliary sealing piece is annularly arranged on the inner side face, at least closest to the second connecting piece, of the main body sealing ring. The first auxiliary sealing piece seals the main body sealing ring and the first connecting piece and controls the pressure distribution of the sealing assembly on the outer edge side curved surface, and the second auxiliary sealing piece seals the main body sealing ring and the second connecting piece and controls the pressure distribution of the sealing assembly on the inner edge side curved surface. Therefore, one degree of freedom is added equivalently, the deformation amount of the sealing assembly can be accurately adjusted, so that the gap of the sealing surface is controlled, and the problem that the surface of the first connecting piece is scratched during relative movement can be avoided while reliable sealing is realized.

Description

Technical Field

[0001] This invention relates to the field of high-pressure sealing technology, and in particular to a sealing component and connection structure. Background Technology

[0002] Currently, end caps, plungers, or other shaft parts typically use expansion sealing rings for sealing and fixation. However, conventional expansion sealing rings usually rely solely on their own material and structural properties to control their deformation. Under high / ultra-high pressure conditions, they cannot accurately adjust the amount of deformation, resulting in larger gaps on the sealing surface and a higher risk of sealing failure. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a sealing component and a connection structure.

[0004] In a first aspect, the sealing assembly of the present invention is used to seal a first connector and a second connector and includes at least one main sealing ring. Each of the main sealing rings has an outer surface and an inner surface. A first auxiliary seal is provided on the outer surface of at least the main sealing ring closest to the first connector, and a second auxiliary seal is provided on the inner surface of at least the main sealing ring closest to the second connector.

[0005] Furthermore, at least on the outermost surface of the main sealing ring closest to the first connector, a third auxiliary seal is also provided, the third auxiliary seal being spaced apart from the first auxiliary seal in the axial direction of the main sealing ring. The first auxiliary seal is configured to seal the first connector or two adjacent main sealing rings under a first pressure; the second auxiliary seal is configured to seal the second connector or two adjacent main sealing rings under a second pressure; and the third auxiliary seal is configured to seal the first connector or two adjacent main sealing rings under a third pressure, wherein the third pressure is less than the first pressure and the second pressure.

[0006] Furthermore, a first groove for receiving the first auxiliary seal is provided on the outer surface of the main sealing ring, and the first groove is formed as a U-shaped groove or an L-shaped groove.

[0007] Furthermore, the inner side of the main sealing ring or the second connecting member is provided with a second groove for receiving the second auxiliary sealing member, and the second groove is formed as a U-shaped groove.

[0008] Furthermore, a third groove for receiving the third auxiliary seal is provided on the outer side of the main sealing ring, and the third groove is formed as a U-shaped groove.

[0009] Furthermore, the first auxiliary seal is provided on the outer surface of each of the main sealing rings.

[0010] Furthermore, each of the main sealing rings also has a first end face. A fourth auxiliary seal is provided on the first end face of each of the main sealing rings, and the fourth auxiliary seal is configured to seal the second connector under the first pressure, the second pressure, or the third pressure.

[0011] Furthermore, a fourth groove for receiving the fourth auxiliary seal is provided on the first end face of the main sealing ring, and the fourth groove is formed as a U-shaped groove.

[0012] Furthermore, there is only one main sealing ring. The outer surface of the main sealing ring is provided with the first auxiliary sealing element and the third auxiliary sealing element, which are spaced apart. The inner surface of the main sealing ring is provided with the second auxiliary sealing element, and the third pressure is less than the first pressure and the second pressure.

[0013] Furthermore, there are multiple main sealing rings, which are arranged sequentially around each other. A first auxiliary sealing element is provided on the outer side of each main sealing ring, a second auxiliary sealing element is provided on the inner side of the innermost main sealing ring, and a third auxiliary sealing element is provided on the outer side of the outermost main sealing ring.

[0014] In a second aspect, the connection structure of the present invention includes a first connector, a second connector, and any of the sealing components described above, wherein the sealing component is disposed between the first connector and the second connector and seals the first connector and the second connector.

[0015] The present invention has the following beneficial effects: In this application, a first auxiliary seal is provided on the outer surface of the main sealing ring closest to the first connector, and a second auxiliary seal is provided on the inner surface of the main sealing ring closest to the second connector. The first auxiliary seal can seal the connection between the main sealing ring and the first connector and control the pressure distribution of the sealing assembly on the outer curved surface. The second auxiliary seal can seal the connection between the main sealing ring and the second connector and control the pressure distribution of the sealing assembly on the inner curved surface. This effectively adds a degree of freedom, allowing for precise adjustment of the deformation of the sealing assembly, thereby controlling the gap in the sealing surface. This achieves reliable sealing while avoiding scratches on the inner surface of the first connector caused by relative movement between the sealing assembly and the surface of the first connector.

[0016] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0017] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0018] Figure 1 This is a schematic diagram illustrating the connection between the components of a sealing structure provided in an embodiment of this application; Figure 2 A schematic diagram illustrating the connection between the components of another sealing structure provided in this application embodiment; Figure 3 This is a three-dimensional structural diagram of a sealing assembly provided in an embodiment of this application, wherein the first connecting member has been removed for clarity; Figure 4 A schematic diagram illustrating the connection between the components of another sealing structure provided in this application embodiment; Figure 5 This is a schematic diagram showing the connection between the first sealing component and the second connector provided in an embodiment of this application; Figure 6 A three-dimensional structural schematic diagram of the main sealing ring in the first type of sealing assembly provided in the embodiments of this application; Figure 7 This is a schematic diagram showing the connection between the second sealing component and the second connector provided in the embodiments of this application; Figure 8 This is a schematic diagram showing the connection between the third sealing component and the second connector provided in an embodiment of this application.

[0019] The reference numerals in the attached figures are explained as follows: 100. Sealing assembly; 10. Main sealing ring; 11. Outer surface; 12. Inner surface; 13. First end face; 14. Second end face; 20. First auxiliary seal; 30. Second auxiliary seal; 40. Third auxiliary seal; 50. Fourth auxiliary seal; C1. First groove; C2. Second groove; C3. Third groove; C4. Fourth groove; 200. First connector; 300. Second connecting member; 310. Main body; 320. Supporting part; 400. End cap. Detailed Implementation

[0020] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0021] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0022] This application provides a sealing assembly that can be used for sealing between end caps, plungers, or other shaft-like parts. It can also be used between other components that require sealing. The application scenarios of the sealing assembly are not specifically limited in the embodiments of this application.

[0023] Please refer to Figures 1 to 8 The sealing assembly 100 is disposed between the sealing connection of the first connector 200 and the second connector 300 to seal the connection between the first connector 200 and the second connector 300. The first connector 200 can be a cylinder or a sleeve, and the second connector 300 can be a plunger (e.g., a piston disposed inside the first connector 200 and cooperating with it) that is located within the first connector 200. Figure 1 and Figure 4 (as shown) or other shaft-like parts (such as) that pass through the first connector 200. Figure 2 (As shown).

[0024] The sealing assembly 100 may include at least one main sealing ring 10, each main sealing ring 10 having an outer surface 11 and an inner surface 12. Specifically, the sealing assembly 100 may include one or more main sealing rings 10, and when there are multiple main sealing rings 10, the multiple main sealing rings 10 are arranged sequentially around each other. That is, when there are multiple main sealing rings 10, one of two adjacent main sealing rings 10 is fitted over the outside of the other.

[0025] It should be noted that the function of the main sealing ring 10 is to compensate for the deformation of the first connecting piece 200 under high pressure by its own radial expansion under high pressure, so as to avoid failure of the sealing surface.

[0026] The first auxiliary seal 20 is provided on the outer surface 11 of at least the main sealing ring 10 closest to the first connector 200, that is, the first auxiliary seal 20 is provided on the outer surface 11 of at least the outermost main sealing ring 10. In other words, when there is one main sealing ring 10, it is the main sealing ring closest to the first connector 200; when there are multiple main sealing rings 10, the first auxiliary seal 20 may be provided on the outer surface 11 of only the outermost main sealing ring 10, or the first auxiliary seal 20 may be provided on the outer surface 11 of the outermost and some other main sealing rings 10, or the first auxiliary seal 20 may be provided on the outer surface 11 of all the main sealing rings 10.

[0027] At least the inner surface 12 of the main sealing ring 10 closest to the second connector 300 is provided with a second auxiliary seal 30, that is, at least the innermost main sealing ring 10 is provided with a second auxiliary seal 30. In other words, when there is one main sealing ring 10, it is the main sealing ring closest to the second connector 300; when there are multiple main sealing rings 10, the second auxiliary seal 30 may be provided only on the inner surface 12 of the innermost main sealing ring 10, or the second auxiliary seal 30 may be provided on the inner surface 12 of the outermost and some other main sealing rings 10, or the second auxiliary seal 30 may be provided on the inner surface 12 of all the main sealing rings 10.

[0028] In the sealing assembly 100 of this application, a first auxiliary seal 20 is provided on the outer side 11 of the main sealing ring 10 closest to the first connector 200, and a second auxiliary seal 30 is provided on the inner side 12 of the main sealing ring 10 closest to the second connector 300. The first auxiliary seal 20 can seal and connect the main sealing ring 10 and the first connector 200 and can control the pressure distribution of the sealing assembly 100 on the outer edge curved surface. The second auxiliary seal 30 can seal and connect the main sealing ring 10 and the second connector 300 and can control the pressure distribution of the sealing assembly 100 on the inner edge curved surface. This is equivalent to adding a degree of freedom, which allows for precise adjustment of the deformation of the sealing assembly 100, thereby controlling the gap of the sealing surface (e.g., controlling the gap of the sealing surface to be within 0.3 mm). This achieves reliable sealing while avoiding scratches on the inner surface of the first connector 200 caused by relative movement between the sealing assembly 100 and the inner surface of the first connector 200.

[0029] Furthermore, based on the installation position and / or different material selection of the first auxiliary seal 20, the deformation of the sealing assembly 100 can be precisely adjusted under different pressure conditions (such as high pressure / ultra-high pressure), thereby greatly reducing the possibility of sealing failure of the sealing surface.

[0030] In some embodiments, please refer to Figures 1 to 4 as well as Figure 6 and Figure 7 At least on the outer side 11 of the main sealing ring 10 closest to the first connector 200, a third auxiliary seal 40 is also provided, and the third auxiliary seal 40 and the first auxiliary seal 20 are spaced apart in the axial direction of the main sealing ring 10.

[0031] The outermost first auxiliary seal 20 is configured to seal the first connector 200 under the first pressure, and the first auxiliary seal 20 located between the two main sealing rings 10 is configured to seal the two adjacent main sealing rings 10 under the first pressure.

[0032] The innermost second auxiliary seal 30 is configured to seal the connection of the second connector 300 under the second pressure, and the second auxiliary seal 30 located between the two main sealing rings 10 is configured to seal the connection of the two adjacent main sealing rings 10 under the second pressure.

[0033] The innermost third auxiliary seal 40 is configured to seal the first connector 200 under a third pressure. The third auxiliary seal 40 located between the two main sealing rings 10 is also configured to seal the two adjacent main sealing rings 10 under a third pressure, where the third pressure is less than the first and second pressures. For example, the third pressure is less than 40 MPa, and the first and second pressures are not less than 40 MPa.

[0034] That is, the first auxiliary seal 20 (e.g., a Y-ring) is used for sealing under high-pressure conditions (typically above 40 MPa, applicable to pressures up to 600 MPa and above), but it cannot effectively seal under medium- and low-pressure conditions (typically below 40 MPa). The second auxiliary seal 30 (e.g., a Y-ring) is used for sealing under high-pressure conditions (typically above 40 MPa, applicable to pressures up to 600 MPa and above), but it cannot effectively seal under medium- and low-pressure conditions (typically below 40 MPa). The third auxiliary seal 40 (e.g., a Glyd ring) is used for sealing under medium- and low-pressure conditions (typically 40 MPa and below), but it cannot effectively seal under higher pressure conditions. Therefore, based on the arrangement of the first auxiliary seal 20, the second auxiliary seal 30, and the third auxiliary seal 40, the sealing assembly 100 can be used for sealing under both medium- and low-pressure and high / ultra-high-pressure conditions.

[0035] Specifically, under medium and low pressure conditions, the third auxiliary seal 40 located on the outer edge curved surface can play a sealing role. The pressure distribution on the inner edge curved surface of the sealing assembly 100 is greater than that on the outer edge curved surface. This results in a larger displacement of the lower half of the sealing assembly 100 (i.e., the part of the sealing assembly 100 located on the side of the third auxiliary seal 40 away from the first auxiliary seal 20). In other words, the radial deformation of the sealing assembly 100 is greater in the lower half. This allows for greater radial deformation of the sealing assembly 100 at the position of the third auxiliary seal 40, which can better compensate for the radial deformation of the first connecting member 200 caused by the working pressure, thereby further improving the sealing performance of the sealing surface.

[0036] Under high / ultra-high pressure conditions, the first auxiliary seal 20 and the second auxiliary seal 30 can perform a sealing function. The pressure distribution on the inner edge curved surface of the sealing assembly 100 is greater than that on the outer edge curved surface. This results in a greater displacement of the upper part of the sealing assembly 100 (i.e., the part of the sealing assembly 100 located on the side of the first auxiliary seal 20 away from the second auxiliary seal 30). In other words, the radial deformation of the sealing assembly 100 in the upper part is greater. This allows the radial deformation of the sealing assembly 100 at the position of the first auxiliary seal 20 to be greater, thereby better compensating for the radial deformation of the first connecting member 200 caused by the working pressure, and further improving the sealing performance of the sealing surface.

[0037] It should be noted that, in this embodiment, by controlling the axial positions of the three seals—the first auxiliary seal 20, the second auxiliary seal 30, and the third auxiliary seal 40—within the sealing assembly 100, the pressure distribution under different conditions (medium / low pressure, high pressure / ultra-high pressure) can be controlled, allowing the pressure on the inner and outer edges of the sealing assembly 100 to be adjusted as needed. Furthermore, by controlling the thickness of the main sealing ring 10 in the sealing assembly 100, the overall deformation of the sealing assembly 100 can be controlled. Additionally, by designing and adjusting the above two parameters (the axial positions of the three seals and the thickness of the main sealing ring 10) to control the deformation, the required radial gap with the cylinder body can be maintained. This avoids the seal from failing to seal effectively due to excessive gaps in the sealing surface, and prevents the main sealing ring 10 from contacting the cylinder body surface during relative movement due to excessive expansion, thus preventing scratches on the inner surface of the first connecting member 200.

[0038] Since the main sealing ring 10 needs to operate continuously under high / ultra-high pressure conditions (typical pressures such as 600 MPa and above), the different pressure distributions on the inner and outer arc surfaces of the main sealing ring 10 will cause a complex stress state in the internal structure of the main sealing ring 10. Therefore, the material selection for the main sealing ring 10 needs to meet certain requirements for strength, stiffness, temperature resistance and thermal expansion performance, and wear resistance.

[0039] In terms of strength, the material selected for the main sealing ring 10 needs to meet the fatigue life strength requirements under the service life (e.g., 200,000 cycles). The finite element analysis method can be used to analyze the critical points.

[0040] In terms of stiffness, the parameter related to material deformation is the elastic modulus. It is necessary to comprehensively consider the elastic modulus of the material itself, the elastic modulus of the cylinder material, and the structural cross-section to select a suitable material to ensure that the deformation under pressure meets the requirements.

[0041] Regarding temperature resistance and thermal expansion, some operating conditions may involve significant temperature variations, requiring consideration of the material's temperature resistance and the deformation caused by the coefficient of thermal expansion.

[0042] In terms of wear resistance, since the main sealing ring 10 may come into contact with the cylinder body, the material of the main sealing ring 10 needs to have good wear resistance when the two move relative to each other.

[0043] In some embodiments, please refer to Figures 1 to 5 as well as Figure 7 and Figure 8 The second auxiliary seal 30 is located axially between the first auxiliary seal 20 and the third auxiliary seal 40.

[0044] In some embodiments, please refer to Figures 1 to 3 , Figure 5 , Figure 7 and Figure 8 There can be one main sealing ring 10. The outer side 11 of the main sealing ring 10 is provided with a first auxiliary sealing element 20 and a third auxiliary sealing element 40 arranged at intervals, and the inner side 12 of the main sealing ring 10 is provided with a second auxiliary sealing element 30, and the third pressure is less than the first pressure and the second pressure.

[0045] In this embodiment, based on the configuration of the first auxiliary seal 20, the second auxiliary seal 30 and the third auxiliary seal 40, the sealing assembly 100 can be used for sealing under both medium and low pressure and high / ultra-high pressure conditions.

[0046] In some embodiments, please refer to Figure 4There are multiple main sealing rings 10, which are arranged in sequence around each other. Each main sealing ring 10 has a first auxiliary sealing element 20 on its outer side 11, a second auxiliary sealing element 30 on its inner side 12, and a third auxiliary sealing element 40 on its outer side 11.

[0047] In this embodiment, the gap size of each layer of the main sealing ring 10 can be adjusted more flexibly by using multiple main sealing rings 10, which is suitable for situations where the gap of the sealing surface varies greatly. Furthermore, the gap of the sealing surface that needs compensation can be compensated for by the expansion and deformation of multiple main sealing rings 10. This sealing assembly 100 can also be used for sealing under medium and low pressure as well as high / ultra-high pressure conditions.

[0048] Furthermore, it should be noted that the core of the multi-layer main sealing ring 10 is to generate and control the expansion and deformation of the main sealing ring 10 through the internal and external pressure difference.

[0049] In some embodiments, please refer to Figures 1 to 8 The outer surface 11 of the main sealing ring 10 is provided with a first groove C1 for receiving the first auxiliary sealing member 20. Depending on the installation position of the first auxiliary sealing member 20, the first groove C1 can be formed as a U-shaped groove or an L-shaped groove.

[0050] Specifically, such as Figures 1 to 7 As shown, in order to facilitate installation, when the first auxiliary seal 20 is made of a material with high elasticity and easy deformation (such as rubber), the first groove C1 can be formed on the side surface between the two end faces of the main sealing ring 10, so that the first groove C1 is formed as a U-shaped groove.

[0051] like Figure 8 As shown, when the first auxiliary seal 20 is made of a material with low elasticity and resistance to deformation (such as polytetrafluoroethylene), the first groove C1 can be formed at the connection position between one end face and the side face of the main sealing ring 10. In this case, the first groove C1 is formed as an L-shaped groove, which facilitates the installation of the first auxiliary seal 20. Furthermore, the first auxiliary seal 20 can be further limited in the axial direction of the sealing assembly 100 by parts inside the end cap.

[0052] In some embodiments, please refer to Figures 1 to 8 A second groove C2 for receiving the second auxiliary seal 30 is provided on the inner side 12 of the main sealing ring 10 or on the second connector 300. Depending on the installation position of the second auxiliary seal 30, the second groove C2 can be formed as a U-shaped groove.

[0053] In some embodiments, a third groove C3 for receiving the third auxiliary seal 40 is further provided on the outer surface 11 of the main sealing ring 10. Depending on the installation position of the third auxiliary seal 40, the third groove C3 may be formed as a U-shaped groove. Specifically, the third auxiliary seal 40 may be made of a highly elastic material.

[0054] In some embodiments, a first auxiliary seal 20 is provided on the outer surface 11 of each main sealing ring 10. The first auxiliary seal 20 on the outermost main sealing ring 10 is used to seal the first auxiliary seal 20 and the first connector 200, while the first auxiliary seals 20 at other locations are used to seal and connect two adjacent main sealing rings 10.

[0055] In some embodiments, please refer to Figure 5 , Figure 7 and Figure 8 The main sealing ring 10 also has a first end face 13. A fourth auxiliary seal 50 is provided on the first end face 13 of each main sealing ring 10, and the fourth auxiliary seal 50 is configured to seal the connection of the second connector 300 under a first pressure, a second pressure, or a third pressure. In other words, the fourth auxiliary seal 50 is used for the end face sealing ring, and can achieve effective sealing under both low-pressure and high-pressure / ultra-high-pressure conditions.

[0056] In some embodiments, please refer to Figure 5 , Figure 7 and Figure 8 The main sealing ring 10 has a fourth groove C4 on its first end face 13 to accommodate the fourth auxiliary seal 50. Depending on the installation position of the fourth auxiliary seal 50, the fourth groove C4 can be formed as a U-shaped groove. Specifically, the fourth auxiliary seal 50 can be made of a highly elastic material.

[0057] In some embodiments, please refer to Figures 1 to 8 The main sealing ring 10 is formed into a circular ring structure with a uniform inner diameter. This not only simplifies the structure of the main sealing ring, but also avoids failure caused by stress concentration under ultra-high pressure.

[0058] Please refer to Figure 1 , Figure 2 and Figure 4 This application also provides a connection structure 00, which includes a first connector 200, a second connector 300, and a sealing component 100 as described in any of the above embodiments. The sealing component 100 is disposed between the first connector 200 and the second connector 300 and seals the connection between the first connector 200 and the second connector 300.

[0059] Furthermore, the connection structure 00 provided in the above embodiments and the sealing component 100 embodiments belong to the same concept, and the specific implementation process can be found in the sealing component 100 embodiments, which will not be repeated here.

[0060] In some embodiments, such as Figure 1 and Figure 4 As shown, the first connecting member 200 is a cylinder or sleeve, the second connecting member 300 is a plunger disposed in the first connecting member 200, and the sealing assembly 100 is disposed between the first connecting member 200 and the second connecting member 300, and seals the connection between the first connecting member 200 and the second connecting member 300.

[0061] Specifically, the second connector 30 may include a main body 310 and a support portion 320 disposed at one end of the main body 310 and protruding circumferentially from the main body 310. A sealing assembly 100 is disposed between the main body 310 of the second connector 300 and the first connector 200 and supported on the support portion 320. Furthermore, the connection structure 300 also includes an end cap 400, which is disposed on the end of the main body 310 opposite to the support portion 320 and connected to the main body 310.

[0062] In some embodiments, such as Figure 2 As shown, the first connecting member 200 is a cylinder or sleeve, the second connecting member 300 is a shaft-like part passing through the first connecting member 200, and the sealing assembly 100 is disposed between the first connecting member 200 and the second connecting member 300, sealingly connecting the first connecting member 200 and the second connecting member 300. Furthermore, this connection structure 00 also includes an end cap 400, which is disposed on the end side of the first connecting member 200 and connected to the first connecting member 200 to clamp the sealing assembly 100. The second connecting member 300 passes through the first connecting member 200, the sealing assembly 100, and the end cap 400.

[0063] Additionally, it should be noted that, in Figure 2 In the embodiment shown, there is no need to provide a fourth auxiliary seal 50 on the first end face 13 of each main sealing ring 10, and a third auxiliary seal 40 can be provided on both the inner side 12 and the outer side 11 of each main sealing ring 10.

[0064] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A sealing assembly (100) for sealing a first connector (200) and a second connector (300), characterized in that, Includes at least one main sealing ring (10); Each of the main sealing rings (10) has an outer side (11) and an inner side (12); Among them, at least the outer side (11) of the main sealing ring (10) closest to the first connector (200) is provided with a first auxiliary seal (20), and at least the inner side (12) of the main sealing ring (10) closest to the second connector (300) is provided with a second auxiliary seal (30).

2. The sealing assembly (100) according to claim 1, characterized in that, At least the outer side (11) of the main sealing ring (10) closest to the first connector (200) is also provided with a third auxiliary seal (40), which is spaced apart from the first auxiliary seal (20) in the axial direction of the main sealing ring (10). Wherein, the first auxiliary seal (20) is configured to seal the first connector (200) or the two adjacent main sealing rings (10) under a first pressure; the second auxiliary seal (30) is configured to seal the second connector (300) or the two adjacent main sealing rings (10) under a second pressure; the third auxiliary seal (40) is configured to seal the first connector (200) or the two adjacent main sealing rings (10) under a third pressure, and the third pressure is less than the first pressure and the second pressure.

3. A sealing assembly (100) according to claim 2, characterized in that, The outer side (11) of the main sealing ring (10) is provided with a first groove (C1) for receiving the first auxiliary sealing element (20), and the first groove (C1) is formed as a U-shaped groove or an L-shaped groove.

4. A sealing assembly (100) according to claim 2, characterized in that, The inner side (12) of the main sealing ring (10) or the second connector (300) is provided with a second groove (C2) for receiving the second auxiliary sealing member (30), and the second groove (C2) is formed as a U-shaped groove.

5. A sealing assembly (100) according to claim 2, characterized in that, The outer side (11) of the main sealing ring (10) is also provided with a third groove (C3) for receiving the third auxiliary sealing element (40), and the third groove (C3) is formed as a U-shaped groove.

6. A sealing assembly (100) according to claim 1, characterized in that, The first auxiliary seal (20) is provided on the outer side (11) of each of the main sealing rings (10).

7. A sealing assembly (100) according to any one of claims 2-6, characterized in that, Each of the main sealing rings (10) also has a first end face (13); Each of the main sealing rings (10) is provided with a fourth auxiliary seal (50) on its first end face (13), and the fourth auxiliary seal (50) is configured to seal the second connector (300) under the first pressure, the second pressure or the third pressure.

8. A sealing assembly (100) according to any one of claims 2-6, characterized in that, The main sealing ring (10) is one; The outer side (11) of the main sealing ring (10) is provided with the first auxiliary sealing element (20) and the third auxiliary sealing element (40) spaced apart, and the inner side (12) of the main sealing ring (10) is provided with the second auxiliary sealing element (30), and the third pressure is less than the first pressure and the second pressure.

9. A sealing assembly (100) according to any one of claims 2-6, characterized in that, There are multiple main sealing rings (10), and the multiple main sealing rings (10) are arranged in sequence around the perimeter; Each of the main sealing rings (10) has a first auxiliary seal (20) on its outer side (11), a second auxiliary seal (30) on its innermost side (12), and a third auxiliary seal (40) on its outermost side (11).

10. A connection structure, characterized in that, It includes a first connector (200), a second connector (300), and a sealing assembly (100) as described in any one of claims 1-9, wherein the sealing assembly (100) is disposed between the first connector (200) and the second connector (300) and seals the first connector (200) and the second connector (300).

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