Self-tightening type elastic sealing assembly

Abstract

The utility model discloses a self-tightening type elastic sealing assembly which comprises a sealing ring, a C-shaped ring and a spring, the sealing ring is provided with a hollow cavity, the periphery of the inner side of the sealing ring is provided with a first annular opening, and the first annular opening is communicated with the hollow cavity; the C-shaped ring is arranged in the hollow cavity, the C-shaped ring and the sealing ring are coaxially arranged, a second annular opening is formed in the periphery of the inner side of the C-shaped ring, and the second annular opening communicates with the first annular opening; the spring is an annular spring, and the spring is coaxially arranged in the C-shaped ring. When the sealing assembly is subjected to axial pressure, under the superposition effect of the C-shaped ring and the spring, the shaft end faces on the two sides of the sealing ring can bear larger pressure, and the sealing requirement can be met under the working condition that the pressure is rapidly alternated.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a self-tightening elastic sealing assembly, and more particularly to a self-tightening elastic sealing assembly resistant to high pressure alternation. Background Technology

[0002] For seals used in special operating environments with high pressure and rapid pressure changes, such as internal seals of compressors, where the working pressure is 100MPa or higher and the pressure changes rapidly during operation, the following two sealing solutions are commonly used:

[0003] One type uses a metal C-type sealing ring, which consists of a spring, an intermediate layer, and a sealing layer. The spring is typically made of a high-temperature nickel-based alloy, the intermediate layer is made of a temperature- and corrosion-resistant material, and the sealing layer is made of a flexible metal such as silver or nickel. During use, the helical spring compresses to provide the necessary sealing load, offering sufficient rebound compensation and continuous load even under fluctuating bolt loads. The intermediate layer bridges the discontinuous loads between spring sections into a continuous sealing load. The sealing layer undergoes plastic deformation during compression, creating a meshing seal with the flange face. However, the sealing layer of the metal C-type sealing ring lacks sufficient wear resistance and cannot withstand rapidly changing pressure conditions.

[0004] Another method uses a spring-loaded sealing ring, specifically a high-performance seal consisting of a special spring installed within a U-shaped special engineering plastic core. When this spring-loaded sealing ring is installed in the groove, the built-in energy-storing spring is compressed. The spring force causes the jacket sealing lip to generate a certain contact stress with the sealing surfaces on both sides, thus forming a seal. As the system pressure increases, the system pressure causes the sealing jacket to gradually expand, increasing the sealing force and forming a more effective seal between the jacket and the contact sealing surfaces. However, the strength of the jacket material is usually insufficient. Under high pressure and rapid alternation conditions above 100 MPa, the jacket material will be damaged due to frequent compression and deformation.

[0005] Therefore, it is necessary to provide a new self-tightening elastic sealing assembly suitable for high-pressure and alternating working conditions. Utility Model Content

[0006] The purpose of this invention is to provide a self-tightening elastic sealing assembly to meet the sealing requirements of high-pressure and pressure-alternating working environments.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a self-tightening elastic sealing assembly, the sealing assembly comprising:

[0008] A sealing ring having a hollow cavity, and a first annular opening on the inner periphery of the sealing ring, the first annular opening communicating with the hollow cavity;

[0009] A C-shaped ring is disposed in the hollow cavity and coaxially arranged with the sealing ring. The inner circumference of the C-shaped ring has a second annular opening, which communicates with the first annular opening.

[0010] A spring, wherein the spring is a ring spring, and the spring is coaxially disposed in the C-ring.

[0011] Preferably, the sealing ring includes a first ring body and a second ring body, which are coaxially arranged and are spliced ​​together along the axial direction to form the sealing ring.

[0012] Furthermore, the sealing assembly also includes a back pressure ring, which fits around the outer periphery of the sealing ring, wherein the outer axial end face of the back pressure ring is axially lower than the outer axial end face of the sealing ring.

[0013] In some embodiments, the sealing ring has a mounting portion and a sealing portion that are connected radially, the sealing portion being located inside the mounting portion and having an axial height higher than the mounting portion, wherein the mounting portion and the back pressure ring are mutually engaged and connected.

[0014] In some embodiments, the inner periphery of the back pressure ring is provided with an annular mounting groove, the mounting groove including a first groove wall and a second groove wall disposed opposite to each other, both of the first groove wall and the second groove wall being planar; the two side shaft end faces of the mounting part are also planar, the mounting part is wholly or partially disposed in the mounting groove, and the two side shaft end faces of the mounting part are respectively in surface contact with the first groove wall and the second groove wall.

[0015] In some embodiments, the two axial end faces of the back pressure ring have annular protrusions extending outward along the axial direction, and the annular protrusions are not higher than the sealing portion along the axial direction.

[0016] In some embodiments, the first ring body has a first annular groove, and the second ring body has a second annular groove. When the first ring body and the second ring body are spliced ​​together along the axial direction, the first annular groove and the second annular groove cooperate with each other to form the hollow cavity.

[0017] In some embodiments, the first ring body has a first end face, and the second ring body has a second end face. One of the first end face and the second end face is provided with a protrusion and the other is provided with a concave portion. When the first ring body and the second ring body are spliced ​​together axially, the first end face and the second end face are connected axially, and the protrusion and the concave portion are correspondingly engaged with each other.

[0018] In some embodiments, the first ring body is provided with a first connecting portion, and the second ring body is provided with a second connecting portion. When the first ring body and the second ring body are spliced ​​together along the axial direction, the first connecting portion and the second connecting portion cooperate with each other to make the first ring body and the second ring body interlocked and fixed along the axial direction.

[0019] In some embodiments, both the sealing ring and the back pressure ring are made of non-metallic materials, and the hardness of the back pressure ring is greater than that of the sealing ring.

[0020] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0021] The self-tightening elastic sealing assembly provided in this embodiment of the utility model has a C-shaped ring with a spring built into the hollow cavity of the sealing ring. When the sealing assembly is subjected to axial pressure, the two axial end faces of the sealing ring can withstand greater pressure under the superimposed action of the C-shaped ring and the spring, and can meet the sealing requirements under the condition of rapid pressure alternation.

[0022] In a preferred embodiment of this utility model, the sealing ring is further configured as a split assembly structure, which facilitates the assembly of the sealing assembly; by adding a back pressure ring, the overall structure of the sealing assembly can be simplified and installed more easily, the back pressure ring can form a secondary seal on the outside of the sealing ring, and the overall pressure bearing capacity of the sealing assembly is improved. Attached Figure Description

[0023] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a longitudinal sectional view of the sealing assembly of Embodiment 1 of this utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the middle sealing ring;

[0026] Figure 3 This is a schematic diagram of the sealing ring in the sealing assembly of Embodiment 2 of this utility model;

[0027] Figure 4 This is a schematic diagram of the back pressure ring in the sealing assembly of Embodiment 3 of this utility model;

[0028] Figure 5 This is a longitudinal sectional view of the sealing assembly of Embodiment 3 of this utility model;

[0029] Figure 6 This is a longitudinal sectional view of the sealing assembly of Embodiment 4 of this utility model;

[0030] Wherein: 1. Sealing ring; 11. First ring body; 11a. First annular groove; 12. Second ring body; 12a. Second annular groove; 13. Hollow cavity; 14. First annular opening; 111. First plane; 121. Second plane; 112. Protrusion; 122. Recess; 113. First connecting part; 123. Second connecting part; 1a. Mounting part; 1b. Sealing part;

[0031] 2. C-shaped ring; 21. Second annular opening; 3. Spring; 4. Back pressure ring; 41. Mounting groove; 411. First groove wall; 412. Second groove wall; 42. Annular protrusion. Detailed Implementation

[0032] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the advantages and features of this utility model can be more easily understood by those skilled in the art. Obviously, the embodiments described in this application are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0033] See Figures 1 to 6 The self-tightening elastic sealing assembly shown includes a sealing ring 1, a C-ring 2, and a spring 3. The sealing ring 1 has a hollow cavity 13, and the inner circumference of the sealing ring 1 has a first annular opening 14, which communicates with the hollow cavity 13. The C-ring 2 is disposed in the hollow cavity 13 and is coaxially arranged with the sealing ring 1. The inner circumference of the C-ring 2 has a second annular opening 21, which communicates with the first annular opening 14. The spring 3 is an annular spring, which is coaxially built into the C-ring 2.

[0034] During installation, the spring 3 is first installed in the C-ring 2, and then the C-ring 2 is placed into the hollow cavity 13 of the sealing ring 1 through the first annular opening 14, thus realizing the installation of the C-ring 2 with the spring 3 in the sealing ring 1. The two axial end faces of the sealing ring 1 are sealing surfaces. When subjected to axial pressure, the C-ring 2 and the spring 3 work together to achieve axial self-tightening. The two axial end faces of the sealing ring 1 can withstand greater pressure and meet the sealing requirements under the condition of rapid pressure change.

[0035] In this self-tightening elastic sealing assembly, the sealing ring 1 is assembled from two parts, making it easier to install the C-shaped ring 2 with the spring 3 into the inner cavity of the sealing ring 1. This makes the installation of the sealing assembly more convenient and consistent, and also prevents deformation of the sealing ring 1 during installation, thus avoiding affecting the overall sealing performance of the sealing assembly. Specifically, the sealing ring 1 includes a first ring body 11 and a second ring body 12, which are coaxially arranged and axially joined to form the sealing ring 1. The first ring body 11 has a first annular groove 11a, and the second ring body 12 has a second annular groove 12a. When the first ring body 11 and the second ring body 12 are axially joined, the first annular groove 11a and the second annular groove 12a cooperate to form the hollow cavity 13. Specifically, the first annular groove 11a and the second annular groove 12a are symmetrically arranged.

[0036] In some embodiments, a connecting structure is provided between the first ring body 11 and the second ring body 12, and the two are assembled and fixed into a whole by the connecting structure. Figure 6 In the illustrated embodiment, a first connecting portion 113 is provided on the first ring body 11, and a second connecting portion 123 is provided on the second ring body 12. The first connecting portion 113 and the second connecting portion 123 cooperate and connect with each other, so that the first ring body 11 and the second ring body 12 are interlocked and fixed, allowing the C-shaped ring 2 to be stably placed in the hollow cavity 13 of the sealing ring 1. After forming a sealing assembly, it is then assembled to the position to be sealed. In a specific configuration, one of the first connecting portion 113 and the second connecting portion 123 can be a slot, and the other can be a snap-fit ​​protrusion. After the snap-fit ​​protrusion is inserted into the slot and rotated at a certain angle, the snap-fit ​​protrusion is limited in the slot, thereby achieving axial fixation of the first ring body 11 and the second ring body 12.

[0037] In some embodiments, the sealing assembly further includes a back pressure ring 4, wherein the first ring body 11 and the second ring body 12 are fixed to each other by being mounted in the back pressure ring 4. Specifically, as Figure 1 , Figure 5 As shown, the back pressure ring 4 fits around the outer periphery of the sealing ring 1, fixing the first ring body 11 and the second ring body 12 together, thereby ensuring that the C-shaped ring 2 is stably placed in the hollow cavity 13 of the sealing ring 1. When the sealing assembly includes the back pressure ring 4, it is not necessary to provide a connecting structure between the first ring body 11 and the second ring body 12 for engagement and fixation.

[0038] When the back pressure ring 4 is set, its outer axial end face is lower than the outer axial end face of the sealing ring 1. When used in a sealing environment, the sealing connection of the part to be sealed is achieved by the sealing ring 1 being squeezed axially. Referring to the figures, the sealing ring 1 has a mounting part 1a and a sealing part 1b connected radially. The sealing part 1b is located inside the mounting part 1a, and the height of the sealing part 1b in the axial direction is higher than that of the mounting part 1a. The mounting part 1a and the back pressure ring 4 are connected to each other. Specifically, the inner periphery of the back pressure ring 4 is provided with an annular mounting groove 41. The mounting groove 41 includes a first groove wall 411 and a second groove wall 412 arranged opposite to each other. Both the first groove wall 411 and the second groove wall 412 are planes. The two axial end faces of the mounting part 1a are both planes, specifically the first plane 111 and the second plane 121, respectively. The mounting part 1a is wholly or partially disposed in the mounting groove 41. The two axial end faces of the mounting part 1a are in surface contact with the first groove wall 411 and the second groove wall 412, respectively. That is, the first plane 111 is in surface contact with the first groove wall 411, and the second plane 121 is in surface contact with the second groove wall 412. This makes the sealing ring 1 fit in the mounting groove 41 in the axial direction, so that the first ring body 11 and the second ring body 12 are always in constant position in the axial direction, thereby ensuring that the C-shaped ring 2 is stably placed in the sealing ring 1.

[0039] In some embodiments, both axial end faces of the back pressure ring 4 are flat, and both axial end faces of the sealing ring 1 protrude axially from the two axial end faces of the back pressure ring 4, such as... Figure 4 , Figure 5 As shown; in some other embodiments, annular protrusions 42 extending outward along the axial direction are respectively provided on the two axial end faces of the back pressure ring 4. The annular protrusions 42 are not higher than the outer axial end face of the sealing ring 1, that is, not higher than the axial end face of the sealing part 1b. In this way, when the sealing assembly is used in the position to be sealed, the annular protrusions 42 on the back pressure ring 4 can contact the sealing surface without affecting the sealing performance of the sealing element 1, thereby improving the overall pressure bearing capacity of the sealing assembly.

[0040] In some embodiments, the end faces of the first ring body 11 and the second ring body 12 that are connected along the axial direction are both planes, such as... Figure 3 As shown; in other embodiments, the end faces of the first ring body 11 and the second ring body 12 that are axially connected are connected by a concave-convex fit structure, such as... Figure 1 , Figure 5In the illustrated embodiment, the two end faces of the first ring body 11 and the second ring body 12 that are connected along the axial direction are the first end face and the second end face, respectively. Specifically, the first ring body 11 has a first end face and the second ring body 12 has a second end face. One of the first end face and the second end face is provided with a protrusion 112 and the other is provided with a recess 122. When the first ring body 11 and the second ring body 12 are spliced ​​along the axial direction, when the first end face and the second end face are connected along the axial direction, the protrusion 112 and the recess 122 correspond to each other and cooperate with each other, so that the first ring body 11 and the second ring body 12 are aligned in the axial and radial directions, preventing the two from sliding radially during the installation process and affecting the coaxiality.

[0041] In this invention, both the sealing ring 1 and the back pressure ring 4 are made of non-metallic materials, with the back pressure ring 4 having a higher hardness than the sealing ring 1. Specifically, the sealing ring 1 can be made of a high-molecular-weight material with a large deformation capacity, such as modified polytetrafluoroethylene (PTFE), which can compensate for unevenness in the installation groove at the sealing position when installed. The sealing ring 1 can also be made of a wear-resistant material, such as ultra-high molecular weight polyethylene (UPE), to extend the overall lifespan of the sealing assembly under rapidly alternating pressure environments. The back pressure ring 4 can be made of a higher-strength material, such as polyetheretherketone (PEEK). When the sealing assembly is installed at the sealing position, the back pressure ring 4 forms a secondary seal on the outside of the sealing ring 1 and enhances the overall pressure-bearing capacity of the sealing assembly.

[0042] In summary, the self-tightening elastic sealing assembly provided by this utility model embodiment, by embedding a C-shaped ring 2 with a spring 3 inside the hollow cavity 13 of the sealing ring 1, achieves axial self-tightening under the superimposed action of the C-shaped ring 2 and the spring 3 when subjected to axial pressure. The two axial end faces of the sealing ring 1 can withstand greater pressure, meeting the sealing requirements under conditions of rapid pressure alternation. Furthermore, the sealing ring 1 is configured as a split assembly structure, which facilitates the assembly of the sealing assembly. The addition of a back pressure ring 4 further simplifies the overall structure and installation of the sealing assembly. The back pressure ring 4 can form a secondary seal on the outside of the sealing ring 1, and improves the overall pressure-bearing capacity of the sealing assembly, meeting the requirements of special working conditions with high pressure and rapid pressure alternation, such as the sealing environment inside a compressor.

[0043] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A self-tightening elastic sealing assembly, characterized in that, The sealing assembly includes: A sealing ring having a hollow cavity, and a first annular opening on the inner periphery of the sealing ring, the first annular opening communicating with the hollow cavity; A C-shaped ring is disposed in the hollow cavity and coaxially arranged with the sealing ring. The inner circumference of the C-shaped ring has a second annular opening, which communicates with the first annular opening. A spring, wherein the spring is a ring spring, and the spring is coaxially disposed in the C-ring.

2. The self-tightening elastic sealing assembly according to claim 1, characterized in that: The sealing ring includes a first ring body and a second ring body, which are coaxially arranged and are spliced ​​together along the axial direction to form the sealing ring.

3. The self-tightening elastic sealing assembly according to claim 2, characterized in that: The sealing assembly further includes a back pressure ring, which is fitted around the outer periphery of the sealing ring, wherein the outer axial end face of the back pressure ring is axially lower than the outer axial end face of the sealing ring.

4. The self-tightening elastic sealing assembly according to claim 3, characterized in that: The sealing ring has a mounting portion and a sealing portion that are connected radially. The sealing portion is located inside the mounting portion and its axial height is higher than that of the mounting portion. The mounting portion and the back pressure ring are connected to each other.

5. The self-tightening elastic sealing assembly according to claim 4, characterized in that: The inner periphery of the back pressure ring is provided with an annular mounting groove, the mounting groove including a first groove wall and a second groove wall disposed opposite to each other, both the first groove wall and the second groove wall being planar. The two axial end faces of the mounting part are also flat. The mounting part is wholly or partially disposed in the mounting groove, and the two axial end faces of the mounting part are in surface contact with the first groove wall and the second groove wall, respectively.

6. The self-tightening elastic sealing assembly according to claim 4, characterized in that: The two axial end faces of the back pressure ring have annular protrusions that extend outward along the axial direction, and the annular protrusions are not higher than the sealing part along the axial direction.

7. The self-tightening elastic sealing assembly according to claim 2, characterized in that: The first ring body has a first annular groove, and the second ring body has a second annular groove. When the first ring body and the second ring body are spliced ​​together along the axial direction, the first annular groove and the second annular groove cooperate with each other to form the hollow cavity.

8. The self-tightening elastic sealing assembly according to claim 2, characterized in that: The first ring body has a first end face, and the second ring body has a second end face. One of the first end face and the second end face is provided with a protrusion and the other is provided with a concave portion. When the first ring body and the second ring body are spliced ​​together along the axial direction, the first end face and the second end face are connected along the axial direction, and the protrusion and the concave portion are correspondingly engaged with each other.

9. The self-tightening elastic sealing assembly according to claim 2, characterized in that: The first ring body is provided with a first connecting part, and the second ring body is provided with a second connecting part. When the first ring body and the second ring body are spliced ​​together along the axial direction, the first connecting part and the second connecting part cooperate with each other to make the first ring body and the second ring body interlock and fix each other along the axial direction.

10. The self-tightening elastic sealing assembly according to claim 3, characterized in that: Both the sealing ring and the back pressure ring are made of non-metallic materials, and the hardness of the back pressure ring is greater than that of the sealing ring.

Images