Multi-lip sealing ring for variable pitch and yaw bearing of fan

Abstract

The utility model provides a multi-lip sealing ring for a variable pitch bearing and a yaw bearing of a fan, which belongs to the technical field of wind driven generators, overcomes the defect of poor sealing effect of the existing rubber sealing ring, and comprises an upper sealing lip and a lower sealing lip, a right sealing lip is arranged between the upper sealing lip and the lower sealing lip, and the upper sealing lip and the lower sealing lip are integrally formed. The section cutting plane of the upper sealing lip is in a triangular shape, the included angle of the two sides of the upper sealing lip is an obtuse angle, the section cutting plane of the lower sealing lip is in a long strip shape, the upper sealing lip and the lower sealing lip are arranged in a right upper inclined shape and a left lower inclined shape together, and the right sealing lip is in a long strip shape and is in smooth connection with the lower sealing lip through a concave arc. The sealing grooves are in contact with the side faces of the sealing grooves, and the sealing effect is good; a gap is formed between the right side of the bearing sealing groove and the right sealing lip and has a follow-up compensation sealing function; the lower portion of the dustproof lip is provided with the concave arc face, the dustproof lip is fully lubricated, the dustproof lip and the sealing lip are connected through the concave semicircle, and sufficient elastic space is provided for a lip opening so that the lip opening can not be torn.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind turbines, and particularly relates to a multi-lip sealing ring for variable pitch and yaw bearings of a wind turbine. Background Art

[0002] As people's pursuit of a better environment becomes increasingly high, wind power, as a clean energy and renewable resource, is becoming increasingly popular. The country's continuous investment in the wind power industry has enabled the industry to develop efficiently and rapidly.

[0003] Yaw and pitch bearings play a vital role in wind turbines, ensuring the rotor and blades maintain the proper angle with the wind direction to fully utilize wind energy. Yaw and pitch bearings consist of an inner ring, outer ring, cage, rolling elements, grease, and a rubber seal. The rubber seal primarily seals the grease inside the bearing and prevents foreign matter from entering. As wind turbines evolve from small to large megawatts, the pressure-maintaining capabilities of the yaw and pitch bearings are increasing, placing increasingly stringent demands on the rubber seals.

[0004] To meet surface roughness and corrosion protection requirements during yaw and pitch bearing machining, sandblasting and zinc spraying are used to treat the bearing surface. Before sandblasting and zinc spraying, a set of rubber seals must be installed to ensure the accuracy of the bearing raceway is not affected. After sandblasting and zinc spraying, the previously installed rubber seals are removed and replaced with a complete set of rubber seals. Grease injection and other processes are then carried out.

[0005] The rubber seals in yaw and pitch bearings are required to have a service life of up to 20 years. However, prolonged exposure to harsh high-altitude sunlight significantly impacts the lifespan of the seals. Existing rubber seals are exposed to long periods of sunlight and UV radiation, shortening their lifespan. Furthermore, the repeated installation of the rubber seals during the sandblasting and zinc spraying processes during bearing machining is cumbersome and expensive.

[0006] Among Chinese patent documents, there is an invention publication numbered CN110848269A, entitled "A Rubber Seal Ring for a Wind Turbine Yaw Pitch Bearing." The invention discloses a rubber seal ring for a wind turbine yaw pitch bearing, comprising a seal ring body with a trapezoidal boss at its upper end, a mounting handle at its lower end, a forward-projecting fulcrum at its left end, and a dust lip and a sealing lip at its right end. The trapezoidal boss is configured for detachable connection with the protective seal ring. The end of the seal ring body with the fulcrum overlaps the support platform of the pitch bearing, where the fulcrum contacts the inner wall of the support platform. The mounting handle is inserted into the mounting groove of the pitch bearing. The dust lip fits against the inner wall of the inner or outer ring of the pitch bearing. The sealing lip cooperates with the sealing groove of the pitch bearing and contacts the inner and outer rings of the pitch bearing to form a sealed cavity. The invention solves the complex process and sealing issues associated with bearing manufacturing. It can reduce seal ring aging and significantly extend the service life of the seal ring. It also provides excellent pressure retention and effectively prevents grease leakage.

[0007] However, the sealing lip of the above-mentioned rubber sealing ring is sharp. When it contacts the inner side of the inner ring or outer ring of the pitch and yaw bearing, the sealing effect is poor and even noise is generated. This is a technical problem that we urgently need to solve. Utility Model Content

[0008] The purpose of the utility model is to provide a multi-lip sealing ring for a wind turbine pitch and yaw bearing to solve the above-mentioned technical problems existing in the prior art.

[0009] According to the above purpose, the basic technical solution of the utility model is: a multi-lip sealing ring for wind turbine pitch and yaw bearings, comprising a body, a sealing lip being provided on the right side of the body, characterized in that: the sealing lip comprises an upper sealing lip and a lower sealing lip, and a right sealing lip is further provided between the upper sealing lip and the lower sealing lip, the cross-section of the upper sealing lip is triangular, the angle between its two sides is an obtuse angle, and an arc is provided at the angle, the cross-section of the lower sealing lip is long strip-shaped, and the end thereof is provided with a rounded corner, the upper sealing lip and the lower sealing lip together form an upper right and lower left inclined arrangement, the right sealing lip is also long strip-shaped, one side of which is co-edge with the upper sealing lip, the lip end is perpendicular to the side, and the other side is smoothly connected to the lower sealing lip through an inward concave arc.

[0010] Furthermore, a sealing groove is provided on the outer ring or inner ring of the pitch and yaw bearing, the cross-section of the sealing groove is a rectangle with one end open, the upper side of the sealing groove abuts against the upper sealing lip, and the lower side of the sealing groove abuts against the lower sealing lip.

[0011] Furthermore, a gap is provided between the right side of the sealing groove and the right sealing lip.

[0012] More specifically, when the upper sealing lip is worn, the right side of the sealing groove abuts against the right sealing lip.

[0013] The multi-lip sealing ring for the pitch and yaw bearings of a wind turbine further comprises a dust lip that is in rotational contact with the inner side surface of the outer ring or inner ring of the pitch and yaw bearings.

[0014] Furthermore, the dust lip is arranged on the upper right side of the body, which is consistent with the extending direction of the sealing lip.

[0015] More specifically, the dust lip is provided with an inwardly concave arc surface close to its lower portion.

[0016] Furthermore, the dust lip and the sealing lip are connected via an indented semicircle.

[0017] Compared with the prior art, the advantages and beneficial effects of this utility model are:

[0018] 1. This product is equipped with an upper sealing lip, a lower sealing lip and a right sealing lip, and is provided with multiple lip openings, which are in contact with each side of the sealing groove respectively, and have a good sealing effect;

[0019] 2. A gap is provided between the right side of the bearing seal groove and the right sealing lip of the utility model product to play a subsequent compensatory sealing function;

[0020] 3. The dust lip of this utility model has a concave arc surface close to its lower part, which can store grease and provide grease replenishment for the dust lip, fully lubricating the dust lip and extending the service life of the dust lip;

[0021] 4. The dustproof lip and the sealing lip of the utility model are connected by an inwardly concave semicircle, which provides sufficient elastic space for the lip to prevent it from being torn. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the product of the utility model;

[0023] Figure 2 This is a structural diagram of the product's dust lip installed on the outer ring of the bearing;

[0024] Figure 3 This is a structural diagram of the product's dust lip installed on the inner ring of the bearing;

[0025] In the figure: 1. Main body; 2. Sealing lip; 3. Upper sealing lip; 4. Right sealing lip; 5. Lower sealing lip; 6. Concave arc; 7. Dustproof lip; 8. Concave arc surface. DETAILED DESCRIPTION

[0026] Combine Figures 1 to 3 , which is a schematic diagram of the principle structure of an embodiment of a multi-lip sealing ring for a wind turbine pitch and yaw bearing of the present utility model.

[0027] Example 1, combined Figure 1 、 Figure 2 , The dotted line in the figure is the natural state of the lip. The wind turbine pitch and yaw bearing uses a multi-lip sealing ring installed between the inner ring on the left and the outer ring on the right. It includes a body 1, and a sealing lip 2 is provided on the right side of the body 1. The sealing lip 2 includes an upper sealing lip 3 and a lower sealing lip 5. A right sealing lip 4 is also provided between the upper sealing lip 3 and the lower sealing lip 5. The cross-section of the upper sealing lip 3 is triangular, and the angle between its two sides is an obtuse angle. There is an arc at the angle. The cross-section of the lower sealing lip 5 is long and has a rounded corner at its end. The upper sealing lip 3 and the lower sealing lip 5 together form an upper right and lower left inclined arrangement. The right sealing lip 4 is also long and has one side co-edge with the upper sealing lip 3. The end of the lip is perpendicular to the side, and the other side is smoothly connected to the lower sealing lip 5 through an indented arc 6.

[0028] Preferably, a sealing groove is provided on the outer ring of the pitch and yaw bearing, and the cross-section of the sealing groove is a rectangle with one end open, the upper side of the sealing groove abuts against the upper sealing lip 3, the lower side of the sealing groove abuts against the lower sealing lip 5, and a gap is provided between the right side of the sealing groove and the right sealing lip 4.

[0029] Preferably, it also includes a dust lip 7 that is in rotational contact with the inner side surface of the outer ring or inner ring of the pitch and yaw bearings. The dust lip 7 is arranged on the upper right side of the main body 1 and is consistent with the extension direction of the sealing lip 2. The dust lip 7 is provided with a concave arc surface 8 close to its lower part, which can provide grease replenishment for the dust lip 2. The dust lip 7 is connected to the sealing lip 2 through a concave semicircle, which provides sufficient elasticity to the lip and prevents it from being torn.

[0030] Example 2, combined with Figure 1 、 Figure 3 , The dotted line in the figure is the natural state of the lip. The wind turbine pitch and yaw bearing uses a multi-lip sealing ring installed between the inner ring on the left and the outer ring on the right, including a body 1. A sealing lip 2 is provided on the right side of the body 1. The sealing lip 2 includes an upper sealing lip 3, a lower sealing lip 5 and a right sealing lip 4. The cross-section of the upper sealing lip 3 is triangular, and the angle between its two sides is an obtuse angle. An arc is provided at the angle. The cross-section of the lower sealing lip 5 is long and has rounded corners at its ends. The upper sealing lip 3 and the lower sealing lip 5 together form an upper right and lower left inclined arrangement. The right sealing lip 4 is also long and has one side co-edge with the upper sealing lip 3. The end of the lip is perpendicular to the side, and the other side is smoothly connected to the lower sealing lip 5 through an indented arc 6.

[0031] Preferably, a sealing groove is provided on the inner ring of the pitch and yaw bearing, and the cross-section of the sealing groove is a rectangle with one end open. The upper side of the sealing groove abuts against the upper sealing lip 3, and the lower side of the sealing groove abuts against the lower sealing lip 5. A gap is provided between the right side of the sealing groove and the right sealing lip 4. When the upper sealing lip 3 is worn, the right side of the sealing groove abuts against the right sealing lip 4.

[0032] Preferably, it also includes a dust lip 7 that is in rotational contact with the inner side surface of the outer ring or inner ring of the pitch and yaw bearings. The dust lip 7 is arranged on the upper right side of the main body 1 and is consistent with the extension direction of the sealing lip 2. The dust lip 7 is provided with a concave arc surface 8 close to its lower part, which can provide grease replenishment for the dust lip 2. The dust lip 7 is connected to the sealing lip 2 through a concave semicircle, which provides sufficient elasticity to the lip and prevents it from being torn.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0034] Although this document frequently uses the following terms: 1. body; 2. sealing lip; 3. upper sealing lip; 4. right sealing lip; 5. lower sealing lip; 6. concave arc; 7. dust lip; 8. concave arc surface, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of this utility model; interpreting them as any additional limitations is contrary to the spirit of this utility model.

[0035] The above is an introduction to the multi-lip sealing ring for wind turbine pitch and yaw bearings provided by the present invention. The introduction uses specific preferred embodiments to illustrate the principles and implementation methods of the present invention. These embodiments are only used to help understand the principles and core ideas of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the design ideas of the present invention, the implementation plans in the above embodiments can be further combined or replaced, and the present invention can be improved and modified in several ways. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-lip seal ring for a wind turbine pitch and yaw bearing, comprising a body (1), a sealing lip (2) being provided on the right side of the body (1), and characterized in that: The sealing lip (2) comprises an upper sealing lip (3) and a lower sealing lip (5), and a right sealing lip (4) is further provided between the upper sealing lip (3) and the lower sealing lip (5). The cross-section of the upper sealing lip (3) is triangular, and the angle between its two sides is an obtuse angle, and an arc is provided at the angle. The cross-section of the lower sealing lip (5) is long strip-shaped, and its end is provided with a rounded corner. The upper sealing lip (3) and the lower sealing lip (5) together form an upper right and lower left inclined arrangement. The right sealing lip (4) is also long strip-shaped, and one side of it shares a side with the upper sealing lip (3), and the end of the lip is perpendicular to the side, and the other side is smoothly connected to the lower sealing lip (5) through an indented arc (6).

2. The multi-lip seal ring for wind turbine pitch and yaw bearings according to claim 1, characterized in that: A sealing groove is provided on the outer ring or the inner ring of the pitch and yaw bearings. The cross section of the sealing groove is a rectangle with one end open. The upper side of the sealing groove abuts against the upper sealing lip (3), and the lower side of the sealing groove abuts against the lower sealing lip (5).

3. The multi-lip seal ring for wind turbine pitch and yaw bearings according to claim 2, characterized in that: A gap is provided between the right side of the sealing groove and the right sealing lip (4).

4. The multi-lip seal ring for wind turbine pitch and yaw bearings according to claim 3 is characterized in that: When the upper sealing lip (3) is worn, the right side of the sealing groove abuts against the right sealing lip (4).

5. The multi-lip seal ring for wind turbine pitch and yaw bearings according to any one of claims 1 to 4, characterized in that: It also includes a dust lip (7) that is in rotational contact with the inner side of the outer ring or inner ring of the pitch and yaw bearing.

6. The multi-lip seal ring for wind turbine pitch and yaw bearings according to claim 5, characterized in that: The dustproof lip (7) is arranged on the upper right side of the body (1) and is consistent with the extending direction of the sealing lip (2).

7. The multi-lip seal ring for wind turbine pitch and yaw bearings according to claim 6, characterized in that: The dustproof lip (7) is provided with an inwardly concave arc surface (8) close to its lower portion.

8. The multi-lip seal ring for wind turbine pitch and yaw bearings according to claim 5, characterized in that: The dustproof lip (7) and the sealing lip (2) are connected via an inwardly concave semicircle.

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