Lip-shaped sealing ring

Abstract

The invention discloses a lip-shaped sealing ring, and relates to the technical field of sealing rings, the lip-shaped sealing ring comprises a metal framework, a sealing ring outer main body, a protection piece and a spring, the metal framework is semi-embedded in the sealing ring outer main body to form radial support, a spring groove is formed in the outer ring surface of the sealing ring outer main body, and the spring is embedded in the spring groove; the protection piece is arranged on the outer side of the rotating shaft in a sleeving mode, the sealing ring outer body is arranged on the outer side of the protection piece in a sleeving mode, an oil groove is formed in the inner ring face, making contact with the protection piece, of the sealing ring outer body, and the oil groove is communicated with the spring groove through a plurality of lubricating channels distributed circumferentially. The main lip is effectively prevented from being directly abraded in the dynamic sealing process, meanwhile, the stress concentration effect of the edge of the metal framework is eliminated, and therefore the sealing reliability is remarkably improved, and the service life is remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing rings, in particular to a lip-shaped sealing ring. Background Art

[0002] In the field of high-end equipment such as aviation equipment and marine engineering equipment, the reliability of the bearing system directly determines the overall performance and service life of the equipment. Lip seals, as key components of bearing seals, fit tightly to the surface of the rotating shaft through elastic deformation to form a physical isolation barrier. They can prevent the leakage of internal lubricating media (such as hydraulic oil) and block external pollutants such as dust and moisture from invading the interior of the equipment. They play an irreplaceable role in ensuring the stable operation of equipment under complex working conditions.

[0003] However, traditional lip seals have significant technical flaws when subjected to long-term harsh operating conditions such as high-speed rotation, alternating pressure, and media erosion. First, the insufficient strength of the outer body material of the seal ring causes abnormal wear of the main lip area that performs the main sealing function, making it difficult to maintain the integrity of the sealing interface. Second, during the dynamic compensation process, the sharp edge of the metal skeleton and the junction area of ​​the outer body of the seal ring are prone to local stress concentration, which can cause fatigue cracking or structural failure of the outer body material of the seal ring over a long period of time. These problems not only lead to a decrease in sealing performance and an increase in media leakage, but also significantly shorten the service life of the seal ring, increasing the maintenance cost and downtime risk of high-end equipment.

[0004] Therefore, how to develop a lip seal that can effectively avoid direct wear of the main lip during the dynamic sealing process, while eliminating the stress concentration effect at the edge of the metal skeleton, thereby significantly improving the sealing reliability and service life, has become a technical problem that needs to be urgently solved by people in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a lip seal ring that effectively avoids direct wear of the main lip during the dynamic sealing process, and at the same time eliminates the stress concentration effect at the edge of the metal skeleton, thereby significantly improving the sealing reliability and service life.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a lip-shaped sealing ring, comprising a metal skeleton, a sealing ring outer body, a protective member and a spring. The metal skeleton is half-embedded in the interior of the sealing ring outer body to form a radial support. A spring groove is provided on the outer ring surface of the sealing ring outer body, and the spring is embedded in the spring groove. The protective member is sleeved on the outside of the rotating shaft, and the sealing ring outer body is sleeved on the outside of the protective member. An oil groove is provided on the inner ring surface of the sealing ring outer body in contact with the protective member, and the oil groove is connected to the spring groove through a plurality of lubrication channels distributed circumferentially.

[0007] Preferably, the outer body of the sealing ring includes an integrally formed main lip, a lip waist, an outer protective lip, a support portion and an inner lining. The main lip and the lip waist form a U-shaped curved structure. The oil groove is provided on the inner annular surface of the main lip facing the rotating shaft. The spring groove is provided at the bending point of the main lip and the lip waist. The support portion extends from the outer side of the lip waist and has an L-shaped cross-section. The outer end portion of the support portion is bent inward and together with the lip waist forms an installation cavity for the metal frame. The metal frame is embedded in the installation cavity and is pressed and fixed by the inner lining. The outer protective lip is provided on the side of the lip waist away from the support portion.

[0008] Preferably, the edges of the metal skeleton are rounded.

[0009] Preferably, the protective member is made of oil-resistant and friction-resistant nitrile rubber material.

[0010] Preferably, the number of the lubrication channels is set to 16.

[0011] Preferably, the inner diameter of the protective member is smaller than the outer diameter of the rotating shaft, and the two are interference fit, with the interference being 0.9 mm to 0.95 mm.

[0012] Preferably, the metal skeleton is made of 45# steel; and the outer body of the sealing ring is made of polyurethane modified with 5% carbon fiber.

[0013] Preferably, the stiffness of the spring is 0.35 N / mm to 0.4 N / mm.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: 1) A replaceable protective member serves as a sacrificial layer, directly replacing the main lip of the seal ring's outer body to form a friction interface with the rotating shaft. Combined with the fluid dynamic pressure lifting effect generated by the oil groove during shaft operation, a continuous oil film isolation layer is formed between the seal ring's outer body and the protective member, ensuring that the core component responsible for the main sealing function is completely isolated from direct friction. This design avoids abnormal wear of the main lip through the friction mechanism and significantly extends the overall life of the seal ring. 2) The edges of the metal skeleton are rounded, and its smooth transition profile perfectly matches the embedded structure of the outer body of the seal ring, effectively dispersing local stress during the dynamic compensation process. This design fundamentally eliminates the material fatigue cracking or structural failure problems caused by the sharp edges of the metal skeleton in traditional seal rings, ensuring the structural integrity and sealing stability of the seal ring under long-term alternating loads. 3) The oil circuit design, based on 16 evenly distributed lubrication channels connecting the spring groove and the oil groove, forms a continuous lubricating oil film replenishment mechanism during the operation of the rotating shaft. This oil film not only fills the microscopic gaps on the contact surface to improve seal fit and reduce medium leakage, but also efficiently introduces friction heat into the oil circulation system to accelerate heat dissipation, thereby maintaining a stable fluid lubrication state under high-temperature and high-speed conditions and avoiding sudden failure caused by dry friction. 4) The outer body of the sealing ring is made of polyurethane modified with 5% carbon fiber. The addition of carbon fiber significantly enhances the mechanical properties of the material, while giving it excellent wear resistance and dimensional stability. This enhancement makes the outer body of the sealing ring more resistant to deformation and wear under complex working conditions such as high-speed rotation, high pressure and medium erosion. It can maintain the designed interference fit and sealing contact pressure for a long time, thereby effectively extending the service life of the sealing ring and reducing maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of a lip seal ring of the present invention; Figure 2 A three-dimensional cross-sectional view of a lip seal ring of the present invention Figure One ; Figure 3 A three-dimensional cross-sectional view of a lip seal ring of the present invention Figure Two .

[0017] Explanation of the accompanying drawings: 1. Metal skeleton; 2. Upper surface; 3. Rear surface; 4. Outer body of the sealing ring; 5. Inner lining; 6. Outer protective lip; 7. Lip waist; 8. Oil groove; 9. Protective part; 10. Main lip; 11. Spring; 12. Front end face; 13. Lubrication channel; 14. Spring groove; 15. Support part. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] like Figures 1-3As shown, a lip seal ring comprises a metal skeleton 1, a seal ring outer body 4, a protective member 9 and a spring 11. The metal skeleton 1 is half-embedded in the interior of the seal ring outer body 4 to form a radial support. A spring groove 14 is provided on the outer ring surface of the seal ring outer body 4. The spring 11 is embedded in the spring groove 14. The protective member 9 is sleeved on the outside of the rotating shaft, and the seal ring outer body 4 is sleeved on the outside of the protective member 9. An oil groove 8 is provided on the inner ring surface of the seal ring outer body 4 in contact with the protective member 9. The oil groove 8 is connected to the spring groove 14 through a plurality of lubrication channels 13 distributed circumferentially.

[0020] Specifically, the outer body 4 of the sealing ring and the protective member 9 adopt a sliding sleeve connection structure, wherein the protective member 9 is designed as a replaceable sacrificial layer, and its inner diameter is smaller than the outer diameter of the rotating shaft to form an interference fit. During the dynamic sealing process, the protective member 9 directly replaces the main lip 10 to become the friction interface, delaying the loss of the core components of the outer body 4 of the sealing ring through its own wear; When the rotating shaft is running, the lubricating oil accumulated in the oil groove 8 is sheared to form a high-pressure oil film layer. The fluid dynamic pressure generated by the oil film slightly lifts the outer body 4 of the sealing ring, so that the solid contact between the protective part 9 and the outer body 4 of the sealing ring is transformed into a micron-level oil film isolation state. This design ensures that the outer body 4 of the sealing ring, which undertakes the main sealing function, is almost not involved in direct friction, thereby significantly extending the service life of the core sealing structure.

[0021] Specifically, the outer body 4 of the sealing ring includes an integrally formed main lip 10, a lip waist 7, an outer protective lip 6, a support portion 15 and an inner lining 5. The main lip 10 and the lip waist 7 form a U-shaped curved structure. The oil groove 8 is provided on the inner annular surface of the main lip 10 facing the rotating shaft. The spring groove 14 is provided at the bending point between the main lip 10 and the lip waist 7. The support portion 15 extends from the outside of the lip waist 7 and has an L-shaped cross-section. The outer end portion of the support portion 15 is bent inward and together with the lip waist 7 forms an installation cavity of the metal skeleton 1. The metal skeleton 1 is embedded in the installation cavity and is pressed and fixed by the inner lining 5. The outer protective lip 6 is provided on the side of the lip waist 7 away from the support portion 15.

[0022] Specifically, the front end face 12 of the support portion 15 fits against the end cover of the sealed device during installation, with the lip facing the sealed medium cavity, and the rear surface 3, upper surface 2 and outer protective lip 6 exposed to the external environment, forming a multi-stage barrier structure for external particles.

[0023] Specifically, the edges of the metal skeleton 1 are rounded.

[0024] Specifically, the rounded metal skeleton 1 provides rigid support for the outer body 4 of the sealing ring, and its smoothly transitioned edge profile eliminates stress concentration sources, thereby fundamentally avoiding material wear or structural failure of the outer body 4 of the sealing ring due to local stress concentration.

[0025] Specifically, the protective member 9 is made of oil-resistant and friction-resistant nitrile rubber material.

[0026] Specifically, the number of the lubrication channels 13 is set to 16.

[0027] Specifically, the inner diameter of the protective member 9 is smaller than the outer diameter of the rotating shaft, and the two are interference fit, with the interference amount being 0.9 mm to 0.95 mm.

[0028] Specifically, the metal frame 1 is made of 45# steel; and the outer body 4 of the sealing ring is made of polyurethane modified with 5% carbon fiber.

[0029] Specifically, the stiffness of the spring 11 is 0.35 N / mm to 0.4 N / mm.

[0030] Specifically, under the action of a preset interference fit, the main lip 10 and the protective member 9 fit tightly against the rotating shaft to form an initial sealing pressure, while the spring 11 applies a dynamic radial compensating tightening force through a contraction force; when the rotating shaft is running, the lubricating oil in the oil groove 8 generates a fluid dynamic pressure effect under the shear action of the axial surface, forming a continuous oil film between the main lip 10 and the protective member 9. This oil film significantly improves the fit by filling the microscopic gaps on the contact surface, effectively reducing the leakage of the lubricating oil medium, and introducing friction heat into the oil circulation system to accelerate heat dissipation, thereby avoiding dry friction wear on the contact surface under high temperature and high speed conditions.

[0031] The working principle of the present invention is as follows: In the initial installation state, the protective part 9 is tightly fitted onto the rotating shaft with an interference fit of 0.9mm to 0.95mm to form basic sealing pressure. At the same time, the spring 11 provides continuous radial compensation force to the main lip 10 with a stiffness of 0.35N / mm to 0.4N / mm. When the rotating shaft is running, the lubricating oil in the oil groove 8 generates a fluid dynamic pressure effect under the shear action of the axial surface, forming a micron-level oil film isolation layer between the main lip 10 and the protective part 9. The oil film significantly improves the sealing fit by filling the microscopic gaps on the contact surface. In addition, the lubricating oil in the 16 circumferentially distributed lubrication channels 13 is continuously replenished to the oil groove 8 to maintain the integrity of the oil film and introduce friction heat into the oil circulation system to accelerate heat dissipation, so that the outer body 4 of the sealing ring that performs the main sealing function is completely separated from direct friction, thereby effectively extending the service life of the sealing ring.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A lip seal ring, characterized in that: The invention comprises a metal skeleton (1), a sealing ring outer body (4), a protective member (9) and a spring (11), wherein the metal skeleton (1) is half-enclosed and embedded in the interior of the sealing ring outer body (4) to form a radial support, a spring groove (14) is provided on the outer ring surface of the sealing ring outer body (4), and the spring (11) is embedded in the spring groove (14), the protective member (9) is sleeved on the outer side of the rotating shaft, and the sealing ring outer body (4) is sleeved on the outer side of the protective member (9), an oil groove (8) is provided on the inner ring surface of the sealing ring outer body (4) in contact with the protective member (9), and the oil groove (8) is connected to the spring groove (14) through a plurality of lubrication channels (13) distributed circumferentially.

2. A lip seal according to claim 1, characterized in that: The outer body (4) of the sealing ring includes an integrally formed main lip (10), a lip waist (7), an outer protective lip (6), a support portion (15) and an inner lining (5), wherein the main lip (10) and the lip waist (7) form a U-shaped curved structure, the oil groove (8) is provided on the inner annular surface of the main lip (10) facing the rotating shaft, the spring groove (14) is provided at the bending point between the main lip (10) and the lip waist (7), the support portion (15) extends from the outer side of the lip waist (7) and has an L-shaped cross section, the outer end portion of the support portion (15) is bent inward, and together with the lip waist (7) forms an installation cavity of the metal frame (1), the metal frame (1) is embedded in the installation cavity and is pressed and fixed by the inner lining (5), and the outer protective lip (6) is provided on the side of the lip waist (7) away from the support portion (15).

3. A lip seal according to claim 2, characterized in that: The edges of the metal frame (1) are rounded.

4. The lip seal according to claim 1, characterized in that: The protective member (9) is made of an oil-resistant and friction-resistant nitrile rubber material.

5. The lip seal according to claim 1, characterized in that: The number of the lubrication channels (13) is set to 16.

6. The lip seal ring according to claim 1, characterized in that: The inner diameter of the protective member (9) is smaller than the outer diameter of the rotating shaft, and the two are interference fit, with the interference amount being 0.9 mm to 0.95 mm.

7. The lip seal according to claim 1, characterized in that: The metal frame (1) is made of 45# steel; the outer body (4) of the sealing ring is made of polyurethane modified with 5% carbon fiber.

8. The lip seal ring according to claim 1, characterized in that: The stiffness of the spring (11) is 0.35 N / mm to 0.4 N / mm.

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