Multi-lip bearing sealing ring

Abstract

The utility model discloses a multi-lip bearing sealing ring which comprises a sealing ring body and a supporting framework installed in the sealing ring, a first sealing lip is arranged on the outer extension edge of the sealing ring body, and a second sealing lip is arranged on the inner extension edge of the sealing ring body. A third sealing lip and a fourth sealing lip extend from the inner extension edge of the sealing ring body in the circle center direction of the sealing ring body, and the first sealing lip, the second sealing lip, the third sealing lip and the fourth sealing lip are each of an annular structure. A first inner groove is formed between the second sealing lip and the fourth sealing lip, a second inner groove is formed between the third sealing lip and the fourth sealing lip, the unique multi-lip sealing structure design forms a labyrinth sealing effect, when trying to pass through the sealing ring, lubricating oil or impurities need to pass through a plurality of zigzag channels, and therefore the sealing effect is greatly improved. The length and resistance of a leakage path are increased, the labyrinth effect effectively prevents leakage of lubricating oil and invasion of impurities, and the sealing performance is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing rings, and in particular to a multi-lip bearing sealing ring. Background Technology

[0002] Bearing seals are crucial components used to prevent grease leakage and the intrusion of external contaminants into the bearing, ensuring its safe and long-lasting operation under required conditions. Bearing seals can be categorized into contact and non-contact types based on their contact method. Non-contact seals do not directly contact the rolling elements and are suitable for high-speed applications; while contact seals are pressed directly onto the shaft, providing better sealing, but resulting in higher frictional torque and temperature.

[0003] Prior art document CN215720270U discloses a high-speed elevator bearing seal ring. While it incorporates an internal L-shaped skeleton for elasticity, the lack of support at the outer lip results in insufficient rigidity, leading to poor stability in contact with the bearing and inadequate installation bonding. The document also incorporates an outer sealing flange and an outer sealing lip to effectively improve the sealing performance at the outer ring position. However, single-lip or double-lip bearing seal rings have limited elastic deformation capabilities, making their performance susceptible to adverse effects under extreme conditions such as high and low temperatures and high speeds. For example, at high temperatures, the seal material may age and harden, increasing the sealing gap between the sealing lip and the shaft; at low temperatures, the material may become brittle, reducing its elasticity and flexibility and affecting the sealing effect.

[0004] Prior art document CN206563037U discloses a novel multi-lip wind turbine slewing bearing seal ring. This multi-lip design meets the requirement of a large number of sealing surfaces in wind turbine slewing bearings, increasing the radial compression between the inner and outer lips and the bearing race. After prolonged operation, it can automatically elastically recover and compensate, maintaining a closed sealing circuit. While the aforementioned document provides a multi-lip bearing seal ring, it lacks a corresponding internal skeleton structure. This prevents the seal ring from maintaining its shape and necessary tension during use, resulting in poor rigidity and a rapid decline in its bonding strength and stability over long-term operation.

[0005] This application addresses the problems in the two existing technologies by designing a sealing ring with an internal skeleton and an external multi-lip structure. This allows the sealing ring to be widely used in bearing seals of various industrial machinery, preventing lubricant leakage and impurity intrusion through reliable sealing, thereby ensuring the normal operation and service life of the equipment. Utility Model Content

[0006] The purpose of this invention is to provide a multi-lip bearing seal to solve the problems mentioned in the background art.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0008] A multi-lip bearing seal ring includes a seal ring body and a support frame installed inside the seal ring. The outer edge of the seal ring body is provided with a first sealing lip, and the inner edge of the seal ring body is provided with a second sealing lip. The inner edge of the seal ring body extends towards the center of the seal ring body with a third sealing lip and a fourth sealing lip. The first, second, third, and fourth sealing lips are all annular structures. An inner groove is formed between the second and fourth sealing lips, and an inner groove is formed between the third and fourth sealing lips.

[0009] Preferably, a pressure-reducing groove is provided between the first sealing lip and the sealing ring body, and a pressure-reducing groove is provided between the second sealing lip and the sealing ring body.

[0010] Preferably, the sidewall of the first sealing lip is provided with an inclined surface.

[0011] Preferably, the support frame is provided with an extension portion one on the side near the outer edge of the sealing ring body, and an extension portion two on the side near the inner edge of the sealing ring body, and the extension portion two is provided in an inclined manner.

[0012] Preferably, the support frame is a metal frame, which can be made of stainless steel or carbon steel.

[0013] Preferably, the sealing ring body, the first sealing lip, the second sealing lip, the third sealing lip, and the fourth sealing lip can all be made of nitrile rubber or fluororubber.

[0014] Beneficial effects: Multi-lip bearing seals are contact-type sealing devices. Their sealing lips directly contact the bearing journal or housing surface, forming a physical barrier to prevent lubricant leakage and external impurities from entering the bearing. During bearing operation, the sealing lips slightly deform with the shaft's rotation, maintaining tight contact with the shaft surface to achieve a good sealing effect.

[0015] The labyrinthine structure, consisting of four sealing lips and double inner grooves, forms two tortuous annular channels: inner groove one between the second and fourth sealing lips, and inner groove two between the third and fourth sealing lips. When lubricating oil or impurities attempt to pass through the seal, they must traverse multiple tortuous channels, increasing the length and resistance of the leakage path. The combination of multiple sealing lips and the labyrinth effect enables the multi-lip bearing seal to provide excellent sealing performance, effectively preventing lubricating oil leakage and the intrusion of external impurities, improving sealing performance, protecting the normal operation of the bearing, and extending the bearing's service life.

[0016] The composite design of the metal skeleton and elastic material further enhances the adaptability to working conditions: the extension part one (rigid support of the outer edge) and the inclined extension part two (stress dispersion of the inner edge) of the support skeleton enable the multi-lip bearing seal ring to adapt to different working conditions, such as high temperature, low temperature, high speed, and high pressure. The properties of the elastic material enable it to maintain good sealing performance under various working conditions, while the metal skeleton provides the necessary strength and stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0018] Figure 2 This is a schematic diagram of a partial cross-sectional structure used in an embodiment to illustrate the assembly of the sealing ring and the bearing;

[0019] Figure 3 This is a schematic diagram illustrating the structure of the sealing ring body in an embodiment.

[0020] Figure 4 This is a schematic diagram illustrating the structure of the supporting skeleton, used as an example.

[0021] Reference numerals: 1. Sealing ring body; 2. Support frame; 3. First sealing lip; 4. Second sealing lip; 5. Third sealing lip; 6. Fourth sealing lip; 7. Inner groove one; 8. Inner groove two; 9. Pressure relief groove one; 10. Pressure relief groove two; 11. Inclined surface; 12. Extension one; 13. Extension two. Detailed Implementation

[0022] See Figures 1 to 4 As shown, a multi-lip bearing seal ring includes a seal ring body 1 and a support frame 2 installed inside the seal ring. The support frame 2 is a metal frame, which can be made of stainless steel or carbon steel. By installing the metal frame inside the seal ring body 1, the seal ring body 1 can be provided with the necessary strength and stability. The support frame 2 is a metal frame, which can be made of stainless steel or carbon steel.

[0023] The support frame 2 has an extension 12 on the side near the outer edge of the sealing ring body 1 and an extension 23 on the side near the inner edge of the sealing ring body 1. The extension 23 is inclined. By adding extension 12 and extension 23, the support frame 2 is positioned in the outer and inner edges of the sealing ring body 1, thereby improving the rigidity of the outer and inner edges of the sealing ring body 1 and improving the stability of the contact between the sealing ring and the bearing. Under the same application scenario and sealing effect, the installation bonding force between the sealing ring and the bearing using the improved support frame 2 is 1.5 times higher than that of the existing support frame 2. The inclined structure of extension 23 can evenly distribute the axial pressure generated by the bearing during operation to the sealing ring body, reducing local stress concentration by 50-60% and reducing the risk of the sealing ring falling off due to stress fatigue by 50-70%, thus significantly extending the service life of the sealing ring.

[0024] A first sealing lip 3 is provided on the outer edge of the sealing ring body 1. By installing the first sealing lip 3, the sealing ring body 1 achieves an interference fit with the sealing groove of the bearing outer ring. A bevel 11 is provided on the side wall of the first sealing lip 3. The bevel 11 on the first sealing lip 3 can serve as a guide to facilitate the assembly of the first sealing lip 3. A pressure-reducing groove 9 is provided between the first sealing lip 3 and the sealing ring body 1. The pressure-reducing groove 9 serves to reduce pressure. If the interference between the bearing outer ring and the first sealing lip 3 is large, the pressure-reducing groove 9 is compressed, and the first sealing lip 3 can move towards the pressure-reducing groove 9, thereby facilitating installation.

[0025] A second sealing lip 4 is provided on the inner edge of the sealing ring body 1. A third sealing lip 5 and a fourth sealing lip 6 extend from the inner edge of the sealing ring body 1 towards the center of the sealing ring body 1. The first sealing lip 3, the second sealing lip 4, the third sealing lip 5, and the fourth sealing lip 6 are all annular structures. An inner groove 7 is formed between the second sealing lip 4 and the fourth sealing lip 6, and an inner groove 8 is formed between the third sealing lip 5 and the fourth sealing lip 6. Through the design of the second sealing lip 4, the third sealing lip 5, and the fourth sealing lip 6 on the inner edge of the sealing ring body 1, and the inner grooves 7 and 8 formed between the sealing lips, a unique three-lip seal is achieved. The structural design creates a labyrinthine sealing effect. When lubricating oil or impurities attempt to pass through the sealing ring, they must traverse multiple tortuous channels, increasing the length and resistance of the leakage path. This labyrinth effect effectively prevents lubricating oil leakage and impurity intrusion, greatly improving sealing performance. The second sealing lip 4, the third sealing lip 5, and the fourth sealing lip 6 have their sealing lips in direct contact with the bearing journal or housing surface, forming a physical barrier to prevent lubricating oil leakage and external impurities from entering the bearing. The sealing lips deform slightly as the shaft rotates, always maintaining close contact with the shaft surface, thus achieving a good sealing effect.

[0026] A pressure-reducing groove 2 10 is provided between the third sealing lip 5 and the sealing ring body 1. The pressure-reducing groove 2 10 plays a role in reducing pressure. If the interference between the bearing inner ring and the third sealing lip 5 is large, the pressure-reducing groove 2 10 is compressed, and the third sealing lip 5 can move towards the pressure-reducing groove 2 10. The fourth sealing lip 6 can move towards the inner groove 1 7, which facilitates installation.

[0027] The sealing ring body 1, the first sealing lip 3, the second sealing lip 4, the third sealing lip 5, and the fourth sealing lip 6 can all be made of nitrile rubber or fluororubber. The properties of the elastic material enable it to maintain good sealing performance under various working conditions. The use of nitrile rubber or fluororubber can adapt to the small displacement and deformation of the bearing during operation, ensuring that the sealing lip and the sealing surface always remain in close contact.

Claims

1. A multi-lip bearing seal ring, comprising a seal ring body (1) and a support frame (2) installed inside the seal ring, characterized in that, The sealing ring body (1) has a first sealing lip (3) on its outer edge and a second sealing lip (4) on its inner edge. The inner edge of the sealing ring body (1) extends toward the center of the sealing ring body (1) with a third sealing lip (5) and a fourth sealing lip (6). The first sealing lip (3), the second sealing lip (4), the third sealing lip (5) and the fourth sealing lip (6) are all annular. An inner groove 1 (7) is formed between the second sealing lip (4) and the fourth sealing lip (6), and an inner groove 2 (8) is formed between the third sealing lip (5) and the fourth sealing lip (6).

2. The multi-lip bearing seal ring according to claim 1, characterized in that, A pressure-reducing groove (9) is provided between the first sealing lip (3) and the sealing ring body (1), and a pressure-reducing groove (10) is provided between the third sealing lip (5) and the sealing ring body (1).

3. A multi-lip bearing seal ring according to claim 2, characterized in that, The first sealing lip (3) has a bevel (11) on its side wall.

4. A multi-lip bearing seal ring according to claim 1, characterized in that, The support frame (2) is provided with an extension part one (12) on the side near the outer edge of the sealing ring body (1), and the support frame (2) is provided with an extension part two (13) on the side near the inner edge of the sealing ring body (1), and the extension part two (13) is arranged in an inclined manner.

5. A multi-lip bearing seal ring according to claim 4, characterized in that, The supporting frame (2) is made of metal and can be made of stainless steel or carbon steel.

6. A multi-lip bearing seal ring according to claim 1, characterized in that, The sealing ring body (1), the first sealing lip (3), the second sealing lip (4), the third sealing lip (5) and the fourth sealing lip (6) can all be made of nitrile rubber or fluororubber.

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