Wind power deviation bearing sealing structure

Abstract

The application provides a wind power variable-axle bearing sealing structure, which comprises a first bearing sleeve ring, a second bearing sleeve ring and a sealing structure, the sealing structure is arranged between the first bearing sleeve ring and the second bearing sleeve ring, the sealing structure is a double sealing ring composed of an inner sealing ring and an outer sealing ring, the inner sealing ring is a double-lip sealing structure, and the outer sealing ring can avoid the direct exposure of the inner sealing ring to the environment, prevent the invasion of soil dust and sand, slow down the aging of the sealing ring, and improve the service life of the sealing ring; the outer sealing ring can improve the sealing performance of the bearing, ensure the storage of the lubricating grease in the bearing, improve the running stability of the bearing, and reduce the maintenance cost.

Description

Technical Field

[0001] This invention belongs to the field of bearing technology, and in particular to the sealing structure of wind power deflection bearings. Background Technology

[0002] With the rapid development of the wind power industry, more and more large-megawatt units are occupying the market, naturally leading to higher requirements for various subsystems. For wind turbines, the pitch bearing, as a core component, directly affects the operational stability of the entire system. The bearing seal isolates the external environment from the internal environment of the bearing, prevents grease leakage, and ensures that the internal grease is not leaked or damaged, thus playing a good role in bearing lubrication. Given that the lifespan of wind turbines is generally only around 25 years, and the operating environment is usually harsh, the lifespan of seals on the market is generally only about 3 years. Such conditions not only affect the seals but also seriously impact the normal operation of the entire wind turbine system. At best, it causes system maintenance difficulties and a sharp increase in costs; at worst, it leads to system shutdown and direct economic losses. Pitch bearing seal failure not only causes grease leakage, directly affecting bearing lubrication, but also, if leakage is not effectively controlled, it leads to changes in internal lubrication factors, causing poor bearing operation. Furthermore, if grease leaks into the environment, it will pollute the environment, contradicting the clean energy principle of wind power generation.

[0003] For bearing sealing, there are many types of seals available, but they mainly improve the interference fit and interface. However, no matter how the shape of a single seal is changed, it is inevitably in direct contact with the harsh external environment. The corrosion problem of the seal is not well solved, and the increase of the sealing groove exacerbates the wear of the seal. At the same time, the improvement effect on the grease leakage problem is minimal, and it cannot fundamentally solve these two problems. Summary of the Invention

[0004] In view of the above problems, the purpose of this application is to design a sealing structure for wind turbine deflection bearings that can be applied in various harsh environments, resist the corrosion of ozone, ultraviolet rays, salt water, etc., and effectively improve the problems of grease leakage and aging deterioration of the sealing ring.

[0005] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a wind turbine deflection bearing sealing structure, comprising a first bearing ring, a second bearing ring, and a sealing structure, wherein the sealing structure is disposed between the first bearing ring and the second bearing ring, and the sealing structure is a double sealing ring composed of an inner sealing ring and an outer sealing ring; the inner sealing ring is a double-lip sealing structure; the inner sealing ring is provided with a first lip and a second lip, both of which are fitted and sealed with the second bearing ring, the first lip being radially interference-fitted with the end face of the second bearing ring, and the second lip being axially interference-fitted with the circumferential surface of the second bearing ring.

[0006] Furthermore, the mounting surface of the outer sealing ring contacts the outer diameter of the first bearing ring, and an outer sealing ring connector is provided on the mounting surface of the outer sealing ring. The outer sealing ring connector is connected and fitted with the outer sealing connection groove of the first bearing ring. A third lip is provided on the outer sealing ring, and the third lip is fitted and sealed with the second bearing ring.

[0007] Furthermore, a retaining groove is provided on the circumferential surface of the second bearing ring, and the second lip is interference-fitted with the inner wall of the retaining groove; an annular groove is provided on the end face of the second bearing ring near the side of the first bearing ring, the first lip is installed in the annular groove, and the third lip is located outside the annular groove.

[0008] Furthermore, the third lip is radially interference-fitted with the end face of the second bearing ring for sealing, and the outer surface of the outer sealing ring connector is provided with several barbs, which are interference-fitted with the outer sealing connection groove for sealing; the outer sealing ring mounting surface is interference-fitted with the outer diameter of the first bearing ring for sealing.

[0009] Furthermore, the mounting surface of the inner sealing ring contacts the outer diameter of the first bearing ring, and an inner sealing ring connector is provided on the mounting surface of the inner sealing ring. The inner sealing ring connector is connected and fitted with the inner sealing connection groove of the first bearing ring. A raised ring is provided on the outer surface of the inner sealing ring connector, and the raised ring is press-fitted with the inner sealing connection groove for sealing. The mounting surface of the inner sealing ring is press-fitted with the outer diameter of the first bearing ring for sealing.

[0010] Furthermore, the first bearing ring is the inner bearing ring, the second bearing ring is the outer bearing ring, the sealing structure is installed on the inner bearing ring, the outer diameter of the inner bearing ring is the sealing diameter, the inner sealing groove and the outer sealing groove are set on the outer diameter of the inner bearing ring, the inner sealing ring connector is connected to the inner sealing groove of the outer diameter of the inner bearing ring, the outer sealing ring connector is connected to the outer sealing groove of the outer diameter of the inner bearing ring, the first lip of the inner sealing ring is connected to the end face of the outer bearing ring, and the second lip is connected to the inner diameter surface of the outer bearing ring.

[0011] Furthermore, the first bearing ring is the outer bearing ring, the second bearing ring is the inner bearing ring, the sealing structure is installed on the outer bearing ring, the inner diameter of the outer bearing ring is the sealing diameter, the inner sealing groove and the outer sealing groove are set on the inner diameter of the outer bearing ring, the inner sealing ring connector is connected to the inner sealing groove of the inner diameter of the outer bearing ring, the outer sealing ring connector is connected to the outer sealing groove of the inner diameter of the outer bearing ring, the first lip of the inner sealing ring is connected to the end face of the inner bearing ring, and the second lip is connected to the surface of the inner diameter of the inner bearing ring.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The sealing structure of the present invention consists of a double sealing ring composed of an inner sealing ring and an outer sealing ring; the outer sealing ring can prevent the inner seal from being directly exposed to the environment, avoiding the intrusion of dirt and dust, slowing down the aging of the sealing ring, and improving the service life of the sealing ring; the outer seal can increase the sealing performance of the bearing, reduce the possibility of grease leakage from a single seal, ensure the amount of grease inside the bearing, improve the bearing's operational stability, and reduce maintenance costs; generally, eccentric bearings are subjected to large loads and low speeds, and there are certain requirements for the bearing seal positioning and torque. The sealing position and spacing of the present invention can be flexibly adapted according to the specific size of the bearing and environmental needs to meet different conditions; the present invention can select the most suitable main parameters according to the bearing size and blade root size, and finally perform seal ring positioning to verify the design scheme. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a sealing structure installed on a bearing;

[0014] Figure 2 This is an enlarged schematic diagram of point A in Example 1;

[0015] Figure 3 This is an enlarged schematic diagram of point B in Example 2;

[0016] In the diagram: 1. Inner ring of bearing; 2. Outer ring of bearing; 3. Inner seal ring; 4. First lip; 5. Second lip; 6. Inner seal ring mounting surface; 7. Inner seal ring connector; 8. Inner seal connecting groove; 9. Outer seal ring; 10. Third lip; 11. Outer seal ring mounting surface; 12. Outer seal ring connector; 13. Outer seal connecting groove; 14. Retaining groove; 15. Annular groove. Detailed Implementation

[0017] To make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] Example 1

[0019] See appendix Figure 1 and 2The wind turbine deflection bearing sealing structure includes a first bearing ring, a second bearing ring, and a sealing structure. The sealing structure is located between the first and second bearing rings and consists of a double sealing ring composed of an inner sealing ring 3 and an outer sealing ring 9. The inner sealing ring 3 is a double-lip sealing structure. The inner sealing ring 3 is provided with a first lip 4 and a second lip 5, both of which cooperate with the second bearing ring for sealing. The first lip 4 is radially interference-fitted with the end face of the second bearing ring, and the second lip 5 is axially interference-fitted with the circumferential surface of the second bearing ring. The sealing ring structure is made of nitrile rubber, and the double sealing structure can delay ozone damage.

[0020] Furthermore, the outer sealing ring mounting surface 11 contacts the outer diameter of the first bearing ring, and an outer sealing ring connector 12 is provided on the outer sealing ring mounting surface 11. The outer sealing ring connector 12 is connected and fitted with the outer sealing connecting groove 13 of the first bearing ring. A third lip 10 is provided on the outer sealing ring 9, and the third lip 10 is fitted and sealed with the second bearing ring.

[0021] Furthermore, a retaining groove 14 is provided on the circumferential surface of the second bearing ring, and the second lip 5 is interference-fitted with the inner wall of the retaining groove 14; an annular groove 15 is provided on the end face of the second bearing ring near the first bearing ring, the first lip 4 is installed in the annular groove 15, and the third lip 10 is located outside the annular groove 15; the retaining groove 14 and the annular groove 15 are designed to be set during forging, which can control the interference of the sealing ring and avoid excessive sealing, which would cause the bearing starting torque to be too large and affect the overall performance of the fan. This ensures both the sealing performance of the bearing and the starting torque within a reasonable range, and also facilitates factory testing by the bearing manufacturer; the design of the annular groove 15 facilitates the subsequent replacement of the inner sealing ring 3; the retaining groove 14 facilitates radial positioning of the sealing structure, and the second lip 5 fits with the retaining groove 14 to prevent internal grease leakage.

[0022] Furthermore, the third lip 10 is radially interference-fitted with the end face of the second bearing ring for sealing, and the outer surface of the outer sealing ring connector 12 is provided with several barbs, which are interference-fitted with the outer sealing connection groove 13 for sealing; the outer sealing ring mounting surface 11 is interference-fitted with the outer diameter of the first bearing ring for sealing; the barb structure facilitates the assembly of the sealing ring and can effectively prevent the sealing ring from moving outward, and this groove structure effectively ensures the firmness of the sealing ring installation.

[0023] Furthermore, the inner sealing ring mounting surface 6 contacts the outer diameter of the first bearing ring, and an inner sealing ring connector 7 is provided on the inner sealing ring mounting surface 6. The inner sealing ring connector 7 is connected and fitted with the inner sealing connection groove 8 of the first bearing ring. A raised ring is provided on the outer surface of the inner sealing ring connector 7, and the raised ring is press-fitted with the inner sealing connection groove 8 for sealing. The inner sealing ring mounting surface 6 is press-fitted with the outer diameter of the first bearing ring for sealing.

[0024] Furthermore, the first bearing ring is the inner bearing ring 1, the second bearing ring is the outer bearing ring 2, the sealing structure is installed on the inner bearing ring 1, the outer diameter of the inner bearing ring 1 is the sealing diameter, the inner sealing connecting groove 8 and the outer sealing connecting groove 13 are provided on the outer diameter of the inner bearing ring 1, the inner sealing ring connecting body 7 is connected to the inner sealing connecting groove 8 on the outer diameter of the inner bearing ring 1, the outer sealing ring connecting body 12 is connected to the outer sealing connecting groove 13 on the outer diameter of the inner bearing ring 1, the first lip 4 of the inner sealing ring 3 is connected to the end face of the outer bearing ring 2, and the second lip 5 is connected to the inner diameter surface of the outer bearing ring 2.

[0025] Example 2

[0026] See appendix Figure 1 and 3 A wind turbine deflection bearing sealing structure includes a first bearing ring, a second bearing ring, and a sealing structure. The sealing structure is located between the first and second bearing rings and is a double sealing ring composed of an inner sealing ring 3 and an outer sealing ring 9. The inner sealing ring 3 is a double-lip sealing structure. The inner sealing ring 3 is provided with a first lip 4 and a second lip 5, both of which are fitted with the second bearing ring for sealing. The first lip 4 is radially interference-fitted with the end face of the second bearing ring for sealing, and the second lip 5 is axially interference-fitted with the circumferential surface of the second bearing ring for sealing.

[0027] Furthermore, the outer sealing ring mounting surface 11 contacts the outer diameter of the first bearing ring, and an outer sealing ring connector 12 is provided on the outer sealing ring mounting surface 11. The outer sealing ring connector 12 is connected and fitted with the outer sealing connecting groove 13 of the first bearing ring. A third lip 10 is provided on the outer sealing ring 9, and the third lip 10 is fitted and sealed with the second bearing ring.

[0028] Furthermore, a retaining groove 14 is provided on the circumferential surface of the second bearing ring, and the second lip 5 is interference-fitted with the inner wall of the retaining groove 14; an annular groove 15 is provided on the end face of the second bearing ring near the side of the first bearing ring, the first lip 4 is installed in the annular groove 15, and the third lip 10 is installed outside the annular groove 15.

[0029] Furthermore, the third lip 10 is radially interference-fitted with the end face of the second bearing ring for sealing, and the outer surface of the outer sealing ring connector 12 is provided with several barbs, which are interference-fitted with the outer sealing connection groove 13 for sealing; the outer sealing ring mounting surface 11 is interference-fitted with the outer diameter of the first bearing ring for sealing.

[0030] Furthermore, the inner sealing ring mounting surface 6 contacts the outer diameter of the first bearing ring, and an inner sealing ring connector 7 is provided on the inner sealing ring mounting surface 6. The inner sealing ring connector 7 is connected and fitted with the inner sealing connection groove 8 of the first bearing ring. A raised ring is provided on the outer surface of the inner sealing ring connector 7, and the raised ring is press-fitted with the inner sealing connection groove 8 for sealing. The inner sealing ring mounting surface 6 is press-fitted with the outer diameter of the first bearing ring for sealing.

[0031] Furthermore, the first bearing ring is the outer bearing ring 2, the second bearing ring is the inner bearing ring 1, the sealing structure is installed on the outer bearing ring 2, the inner diameter of the outer bearing ring 2 is the sealing diameter, the inner sealing connecting groove 8 and the outer sealing connecting groove 13 are provided on the inner diameter of the outer bearing ring 2, the inner sealing ring connecting body 7 is connected to the inner sealing connecting groove 8 of the inner diameter of the outer bearing ring 2, the outer sealing ring connecting body 12 is connected to the outer sealing connecting groove 13 of the inner diameter of the outer bearing ring 2, the first lip 4 of the inner sealing ring 3 is connected to the end face of the inner bearing ring 1, and the second lip 5 is connected to the inner diameter surface of the inner bearing ring 1.

[0032] The position of the inner sealing connection groove 8 is adjusted according to the bearing operating conditions. The first lip and the second lip of the inner sealing ring seal two adjacent surfaces that are perpendicular to each other. The adjustment angle range is large and the sealing is reliable.

[0033] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A wind turbine deflection bearing sealing structure, comprising a first bearing ring, a second bearing ring, and a sealing structure, wherein the sealing structure is disposed between the first bearing ring and the second bearing ring, characterized in that: The sealing structure is a double sealing ring consisting of an inner sealing ring and an outer sealing ring; the inner sealing ring is a double-lip sealing structure; the inner sealing ring is provided with a first lip and a second lip, both of which are sealed with the second bearing ring. The first lip is radially interference-fitted with the end face of the second bearing ring, and the second lip is axially interference-fitted with the circumferential surface of the second bearing ring. The outer sealing ring mounting surface contacts the outer diameter of the first bearing ring, and an outer sealing ring connector is provided on the outer sealing ring mounting surface. The outer sealing ring connector is connected and fitted with the outer sealing connection groove of the first bearing ring. A third lip is provided on the outer sealing ring, and the third lip is fitted and sealed with the second bearing ring. The second bearing ring has a retaining groove on its circumferential surface, and the second lip is interference-fitted with the inner wall of the retaining groove; an annular groove is provided on the end face of the second bearing ring near the first bearing ring, the first lip is installed in the annular groove, and the third lip is located outside the annular groove.

2. The wind power deflection bearing sealing structure according to claim 1, characterized in that: The third lip is radially interference-fitted with the end face of the second bearing ring for sealing; the outer surface of the outer sealing ring connector is provided with several barbs, which are interference-fitted with the outer sealing groove for sealing; the mounting surface of the outer sealing ring is interference-fitted with the outer diameter of the first bearing ring for sealing.

3. The wind power deflection bearing sealing structure according to claim 1, characterized in that: The inner sealing ring mounting surface contacts the outer diameter of the first bearing ring. An inner sealing ring connector is provided on the inner sealing ring mounting surface, and the inner sealing ring connector is connected and fitted with the inner sealing connection groove of the first bearing ring. A raised ring is provided on the outer surface of the inner sealing ring connector, and the raised ring is press-fitted with the inner sealing connection groove for sealing. The inner sealing ring mounting surface is press-fitted with the outer diameter of the first bearing ring for sealing.

4. The wind turbine deflection bearing sealing structure according to any one of claims 1-3, characterized in that: The first bearing ring is the inner bearing ring, and the second bearing ring is the outer bearing ring. The sealing structure is installed on the inner bearing ring, and the outer diameter of the inner bearing ring is the sealing diameter. The inner sealing groove and the outer sealing groove are set on the outer diameter of the inner bearing ring. The inner sealing ring connector is connected to the inner sealing groove on the outer diameter of the inner bearing ring, and the outer sealing ring connector is connected to the outer sealing groove on the outer diameter of the inner bearing ring. The first lip of the inner sealing ring is connected to the end face of the outer bearing ring, and the second lip is connected to the surface of the inner diameter of the outer bearing ring.

5. The wind turbine deflection bearing sealing structure according to any one of claims 1-3, characterized in that: The first bearing ring is the outer bearing ring, and the second bearing ring is the inner bearing ring. The sealing structure is installed on the outer bearing ring, and the inner diameter of the outer bearing ring is the sealing diameter. The inner sealing groove and the outer sealing groove are set on the inner diameter of the outer bearing ring. The inner sealing ring connector is connected to the inner sealing groove of the inner diameter of the outer bearing ring, and the outer sealing ring connector is connected to the outer sealing groove of the inner diameter of the outer bearing ring. The first lip of the inner sealing ring is connected to the end face of the inner bearing ring, and the second lip is connected to the surface of the inner diameter of the inner bearing ring.

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