High-safety grease-leakage-proof wind power variable pitch bearing

Abstract

The invention discloses a high-safety grease-leakage-proof wind power variable pitch bearing which comprises a bearing inner ring (1) and a bearing outer ring (2) which are matched with each other, a rolling body (3) is connected between the bearing inner ring (1) and the bearing outer ring (2), a retainer (4) is arranged on the outer side of the rolling body (3), and an upper sealing belt (5) and a lower sealing belt (6) are arranged between the upper end and the lower end of the bearing inner ring (1) and the upper end and the lower end of the bearing outer ring (2) respectively. The bearing inner ring (1) is a rotating ring, the bearing outer ring (2) is a fixed ring, and the upper sealing belt (5) and the lower sealing belt (6) are both fixed on the bearing inner ring (1). The sealing device has the advantages that the sealing tape is more convenient to replace on the premise that the sealing performance is guaranteed, manual movement is not needed, the replacement efficiency is improved, and potential safety hazards are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine pitch bearing sealing structures, and in particular to a wind turbine pitch bearing with high safety and grease leakage prevention. Background Art

[0002] Wind turbine pitch bearings all need to be sealed. The design life of the bearing is generally 20 years, while the life of the sealing belt is less than 20 years. Therefore, it is inevitable to replace the sealing belt during the service life of the bearing. Due to the bearing structure, the existing wind turbine pitch seal design generally has one side of the sealing belt fixedly installed on the moving ring, and the other side of the sealing belt fixedly installed on the stationary ring.

[0003] The reason for this is that the two faces of the pitch bearing must be staggered in height, and the reference surface of the highly protruding ring of each face is used as the installation reference. For example, on one of the faces, the sealing belt is fixedly rooted and installed on the low-height ring, and the other highly protruding ring has a sealing groove, and the sealing lip penetrates or presses against the sealing groove.

[0004] The sealing belt installed on the moving ring is easy to replace because the person can stay still and the bearing can be rotated to achieve the replacement of the sealing belt. However, the sealing belt installed on the fixed ring is difficult to replace because the person has to move around the bearing to replace it. Since the variable pitch bearing is located at high altitude, some bearing outer rings are exposed to the outside. Even with safety belts and other protective equipment, it is still dangerous for people to move around the bearing. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the sealing belt of the existing wind turbine pitch bearing is difficult to replace and has a high risk factor. A high-safety and grease-leakage-proof wind turbine pitch bearing is provided. While ensuring the sealing performance, the sealing belt is more convenient to replace and no manual movement is required, which improves the replacement efficiency and reduces safety hazards.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A wind turbine pitch bearing with high safety and grease leakage prevention, comprising a bearing inner ring and a bearing outer ring that cooperate with each other, a rolling body connected between the bearing inner ring and the bearing outer ring, and an internal space between the two filled with grease to realize the rotation between the inner and outer rings; A retainer is provided on the outer side of the rolling element, an upper sealing belt is provided between the upper ends of the bearing inner ring and the bearing outer ring, and a lower sealing belt is provided between the lower ends of the bearing inner ring and the bearing outer ring; The inner ring of the bearing is a rotating ring, the outer ring of the bearing is a fixed ring, and the upper sealing belt and the lower sealing belt are both fixed on the inner ring of the bearing; The upper end of the upper sealing belt is provided with a clamping platform, the right end is provided with a fixing bolt, and the left side is provided with a "3"-shaped sealing lip. The inner ring of the bearing is provided with an inwardly concave step platform 1 and a transverse fixing groove. The step platform 1 is connected to the outer side of the fixing groove. The fixing bolt of the upper sealing belt is embedded in the fixing groove and the clamping platform is just clamped on the step platform 1. The fixing bolt is a horizontally placed conical structure, with one end close to the fixing groove being a small end and the other end away from the fixing groove being a large end. A bulge is arranged on the large end, and the height of the bulge before extrusion is greater than the height of the fixing groove. A group of protruding deformed teeth are arranged on the small end, and the deformed teeth are in contact with the inner wall of the fixing groove. A narrow and long air bag is arranged in the fixing bolt, and the air bag is arranged along the axis of the fixing bolt and its two ends are respectively arranged facing the bulge and the deformed teeth. A group of air guide holes are connected to the side of the air bag close to the deformed teeth, and the end of each air guide hole faces the corresponding deformed teeth. The bulge and the inflated deformed teeth are in interference contact with the inner wall of the fixing groove, so that when squeezed, the gas is transported from the outside to the inside and transmitted to the vicinity of the deformed teeth to make it expand and increase the extrusion force and friction between the fixing bolt and the fixing groove, thereby improving the connection strength. The sealing lip comprises an upper sealing lip, a middle sealing lip and a lower sealing lip. The tail of the lower sealing lip is connected with a hook-back boss. A clamping lip is also provided at the connection between the lower sealing lip and the fixing bolt. The inner wall of the outer ring of the bearing is provided with a supporting platform, a sealing groove 1 and a sealing groove 2 in sequence from top to bottom. The inner side of the sealing groove 2 is provided with an upward clamping groove. The upper sealing lip overlaps the supporting platform of the outer ring of the bearing, the middle sealing lip extends into the sealing groove 1, the lower sealing lip extends into the sealing groove 2 and its tail is embedded in the clamping groove. The hook-back boss just abuts against the innermost side of the sealing groove 2, the clamping lip abuts against the inner wall of the inner ring of the bearing, and the sealing lip contacts the inner ring and the outer ring of the bearing to form a sealing cavity.

[0007] Furthermore, the right side of the lower sealing belt is an L-shaped mounting handle, a group of snap-in strips are provided on the vertical section of the mounting handle, the lower surface of the inner ring of the bearing is provided with a concave step platform 2 and a vertical mounting groove, the mounting groove is provided with a transverse groove, the vertical section of the mounting handle is embedded in the mounting groove, the snap-in strip is embedded in the groove and is in interference contact with the inner wall of the mounting groove, and the transverse section of the mounting handle rests on the step platform 2.

[0008] Furthermore, the left side of the lower sealing belt is provided with a first oil sealing lip, a second oil sealing lip, a third oil sealing lip, a first dustproof lip and a second dustproof lip, the angle between the second oil sealing lip and the third oil sealing lip is an acute angle, the first oil sealing lip is arranged between the second oil sealing lip and the vertical section of the mounting handle and it contacts with the inner and outer rings of the bearing to form a sealing cavity, the inner wall of the outer ring of the bearing is provided with a vertical oil sealing groove, a transverse oil sealing groove, a first dustproof platform and a second dustproof platform from top to bottom, the second oil sealing lip is embedded in the vertical oil sealing groove, the three oil sealing lips are embedded in the transverse oil sealing groove, the first dustproof lip is clamped with the first dustproof platform, and the second dustproof lips are overlapped on the second dustproof platform.

[0009] Furthermore, the two dustproof platforms are arranged at an incline, and the angle between them and the vertical direction is smaller than the angle between the two dustproof lips and the vertical direction.

[0010] Furthermore, the card platform is an inverted trapezoidal structure, and its width gradually decreases from top to bottom.

[0011] Furthermore, the lengths of the upper sealing lip and the lower sealing lip are both greater than the length of the middle sealing lip, and the corresponding length of the second sealing groove is greater than the length of the first sealing groove.

[0012] Furthermore, the transition portion between the sealing groove 2 and the inner wall of the bearing outer ring is configured as an inclined slope section, which is arranged obliquely upward to gradually reduce the opening of the sealing groove 2, so as to further improve the stable connection and sealing performance after the sealing lip is embedded.

[0013] Compared with the prior art, the advantages of the technical solution of the present invention are: (1) The present invention changes the traditional lower sealing belt rooting on the outer ring to rooting on the inner ring, and adopts a new structure to achieve sealing, which not only ensures a good sealing effect, but also achieves the purpose of rooting the sealing belt on the dynamic coil. When replacing, people do not need to move, which is convenient for replacement, improves replacement efficiency, and reduces safety hazards; (2) The sealing tape of the present invention adopts a unique air bag structure. The fixing bolt is a cone structure, which is convenient for the front end to be embedded in the fixing groove. When the bulge structure at the rear end is also embedded in the fixing groove, the bulge is compressed toward the air bag, and the gas squeezed by the air bag moves toward the deformed tooth mouth, so that the deformed tooth mouth is pushed out to both sides by the gas, so that it forms an interference fit with the inner wall of the fixing groove, thereby increasing the squeezing force and friction between the tooth mouth and the inner wall of the groove, making the fixation more secure; (3) The sealing belt of the present invention adopts a "3"-shaped special-shaped structure, which can effectively seal the grease layer by layer, improve the sealing performance, and ensure that there is no oil leakage. At the same time, it is also easy to disassemble and replace during replacement, thereby improving work efficiency and reducing the workload of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a wind turbine variable pitch bearing with high safety and grease leakage prevention according to the present invention; Figure 2 for Figure 1 A partial enlarged view of; Figure 3 for Figure 1 B is a partial enlarged view; Figure 4 It is the structural diagram of the upper sealing belt of the present invention; Figure 5 It is the structural diagram of the lower sealing belt of the present invention; Figure 6 It is a schematic diagram of the upper structure of the bearing inner ring and the bearing outer ring of the present invention; Figure 7 It is a schematic diagram of the lower structure of the bearing inner ring and the bearing outer ring of the present invention. Implementation Example

[0015] To make the present invention more clear, a high-safety grease leakage-proof wind turbine pitch bearing of the present invention is further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0016] See also Figure 1 A wind turbine pitch bearing with high safety and grease leakage prevention includes a bearing inner ring 1 and a bearing outer ring 2 that cooperate with each other, a rolling body 3 is connected between the bearing inner ring 1 and the bearing outer ring 2, and the internal space between the two is filled with grease, a retainer 4 is provided on the outside of the rolling body 3, an upper sealing belt 5 is provided between the upper ends of the bearing inner ring 1 and the bearing outer ring 2, and a lower sealing belt 6 is provided between the lower ends of the bearing inner ring 1 and the bearing outer ring 2, and the characteristics are: See also Figure 1 , Figure 2 and Figure 3 , the inner ring 1 of the bearing is a rotating ring, the outer ring 2 of the bearing is a fixed ring, and the upper sealing belt 5 and the lower sealing belt 6 are both fixed on the inner ring of the bearing; See also Figure 1 , Figure 2 , Figure 4 and Figure 6 The upper end of the upper sealing belt 5 is provided with a clamping platform 51, the right end is provided with a fixing bolt 52, and the left side is provided with a "3"-shaped sealing lip 53. The clamping platform 51 is an inverted trapezoidal structure, and its width gradually decreases from top to bottom. The inner ring 1 of the bearing is provided with a concave step platform 11 and a horizontal fixing groove 12. The step platform 11 is connected to the outer side of the fixing groove 12. The fixing bolt 52 of the upper sealing belt 5 is embedded in the fixing groove 12 and the clamping platform 51 is just clamped on the step platform 11; The fixing bolt 52 is a horizontally placed conical structure, with a small end 521 at one end close to the fixing groove 12 and a large end 522 at the other end away from the fixing groove. A bulge 523 is provided on the large end 522. The height of the bulge 523 before extrusion is greater than the height of the fixing groove 12. A group of protruding deformed teeth 524 are provided on the small end 521. The deformed teeth 524 are in contact with the inner wall of the fixing groove 12. A narrow and long air bag 525 is provided in the fixing bolt 52. The air bag 525 is arranged along the axis of the fixing bolt 52 and has two ends. The air bag 525 is arranged facing the bulge 523 and the deformed tooth 524 respectively. A group of air guide holes 526 are connected to one side of the air bag 525 close to the deformed tooth 524. The end of each air guide hole 526 faces the corresponding deformed tooth 524. The bulge 523 and the inflated deformed tooth 524 are in interference contact with the inner wall of the fixing groove 12, so that when squeezed, the gas is transported from the outside to the inside and transferred to the vicinity of the deformed tooth to make it swell and enlarge, thereby increasing the squeezing force and friction between the fixing bolt and the fixing groove, and improving the connection strength. The sealing lip 53 comprises an upper sealing lip 531, a middle sealing lip 532 and a lower sealing lip 533. The tail of the lower sealing lip 533 is connected with a hooking boss 5331. A clamping lip 5332 is further provided at the connection between the lower sealing lip 533 and the fixing bolt 52. The inner wall of the bearing outer ring 2 is provided with a supporting platform 21, a sealing groove 1 22 and a sealing groove 23 from top to bottom. The inner side of the sealing groove 23 is provided with an upward clamping groove 231. The upper sealing lip 531 overlaps the supporting platform 21 of the bearing outer ring 2. The middle sealing lip 532 extends into the sealing groove 1 22. The lower sealing lip 533 extends into the sealing groove 23 and its tail is embedded in the clamping groove 231. The hooking boss 5331 just abuts against the innermost side of the sealing groove 23. The clamping lip 5332 abuts against the inner wall of the bearing inner ring 1. The sealing lip 53 contacts the bearing inner ring 1 and the bearing outer ring 2 to form a sealing cavity. The lengths of the upper sealing lip 531 and the lower sealing lip 533 are both greater than the length of the middle sealing lip 532, and the corresponding length of the second sealing groove 23 is greater than the length of the first sealing groove 22. The transition portion between the second sealing groove 23 and the inner wall of the bearing outer ring 1 is set as an inclined slope section 232. The slope section 232 is arranged obliquely upward to gradually reduce the opening of the second sealing groove 23, so as to further improve the stable connection and sealing performance after the sealing lip is embedded; See also Figure 1 , Figure 3 , Figure 5 and Figure 7 The right side of the lower sealing belt 6 is an L-shaped mounting handle 61, a set of clamping strips 6111 are provided on the vertical section 611 of the mounting handle, the lower surface of the bearing inner ring 1 is provided with a concave step platform 2 13 and a vertical mounting groove 14, the vertical section 611 of the mounting handle 61 is embedded in the mounting groove 14 and the clamping strip 6111 is in interference contact with the inner wall of the mounting groove 14, and the horizontal section 612 of the mounting handle 61 is against the step platform 2 13; The left side of the lower sealing belt 6 is provided with a first oil sealing lip 62, a second oil sealing lip 63, a third oil sealing lip 64, a first dustproof lip 65 and a second dustproof lip 66. The angle between the second oil sealing lip 63 and the third oil sealing lip 64 is an acute angle. The first oil sealing lip 62 is arranged between the second oil sealing lip 63 and the vertical section 611 of the mounting handle 61 and contacts with the inner and outer rings of the bearing to form a sealed cavity. The inner wall of the bearing outer ring 2 is provided with a vertical oil sealing groove 24, a horizontal oil sealing groove 25, a first dustproof platform 26 and a second dustproof platform 27 from top to bottom. The second oil sealing lip 63 is embedded in the vertical oil sealing groove 24, the three oil sealing lips 64 are embedded in the horizontal oil sealing groove 25, the first dustproof lip 65 is snap-fitted with the first dustproof platform 26, and the second dustproof lip 66 is overlapped on the second dustproof platform 27.

[0017] In the present invention, the fixing bolt 52 of the upper sealing belt 5 can be embedded in the fixing groove 12 of the bearing inner ring 1. During the embedding process, since the fixing bolt 52 is a vertebral structure, its small end 521 is easy to insert and the extrusion force with the inner wall of the fixing groove 12 gradually increases. When the bulge 523 of the large end 522 is embedded, the bulge 523 is subjected to the extrusion force of the inner wall of the fixing groove 12 toward the middle of the fixing bolt 52, and the gas outside the air bag 525 in the middle of the fixing bolt 52 is squeezed inwardly and transmitted to the position close to the deformed tooth opening 524 through the air guide hole 526, so that the deformed tooth opening 524 is deformed and expanded, thereby increasing the fixing The extrusion and friction between the inner side of the bolt 52 and the inner wall of the fixed groove 12, when the fixed bolt 52 is fully embedded in the fixed groove 12, the clamping platform 51 is just stuck on the step platform 11, achieving a dustproof sealing effect; at the same time, the "3"-shaped sealing lip 53 on the left side of the upper sealing belt 5 extends into the corresponding sealing groove 1 22 and sealing groove 2 23 respectively, and the hook boss 5331 of the lower sealing lip 533 cooperates with the tail of the lower sealing lip 533, tightly attached to the inner side of the sealing groove 2 23, and the clamping lip 5332 is also blocked between the inner ring 1 and the outer ring 2 of the bearing, forming a sealing cavity between the inner and outer rings to seal the grease. The installation handle of the lower sealing belt 6 is also embedded in the corresponding groove according to the principle of the upper sealing belt 5 to achieve the sealing of the lower part.

[0018] The upper sealing belt 5 and the lower sealing belt 6 of the present invention are both rooted on the inner ring 1 of the bearing. The working mode of the variable pitch bearing is generally that the inner ring of the bearing and the outer ring of the bearing rotate relative to each other, and the internal cavity is filled with grease. The grease below is sealed by the lower sealing belt, and the grease above is sealed by the upper sealing belt to prevent it from leaking out. Normally, the inner ring of the variable pitch is a rotating ring, and the outer ring is a fixed ring. If you want to replace the lower sealing belt, since the inner ring of the bearing where the lower sealing belt is rooted is rotating, people do not need to move to complete the replacement. The present invention realizes that the sealing belt is rooted on the moving ring while ensuring the sealing effect. People do not need to move during replacement, which facilitates replacement and reduces safety hazards.

[0019] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A wind turbine pitch bearing with high safety and grease leakage prevention, comprising a bearing inner ring (1) and a bearing outer ring (2) which cooperate with each other, a rolling body (3) connected between the bearing inner ring (1) and the bearing outer ring (2), a retainer (4) provided on the outer side of the rolling body (3), an upper sealing belt (5) and a lower sealing belt (6) provided between the upper and lower ends of the bearing inner ring (1) and the bearing outer ring (2), respectively, characterized in that: The inner ring (1) of the bearing is a rotating ring, the outer ring (2) of the bearing is a fixed ring, and the upper sealing belt (5) and the lower sealing belt (6) are both fixed on the inner ring (1) of the bearing; The upper end of the upper sealing belt (5) is provided with a clamping platform (51), the right end is provided with a fixing bolt (52), and the left side is provided with a "3"-shaped sealing lip (53); the inner ring of the bearing (1) is provided with an inwardly concave step platform (11) and a transverse fixing groove (12); the step platform (11) is connected to the outer side of the fixing groove (12); the fixing bolt (52) of the upper sealing belt (5) is embedded in the fixing groove (12) and the clamping platform (51) is just clamped on the step platform (11); The fixing bolt (52) is a horizontally placed conical structure, wherein the end close to the fixing groove (12) is a small end (521), and the end away from the fixing groove (12) is a large end (522). The large end (522) is provided with a bulge (523). The height of the bulge (523) before extrusion is greater than the height of the fixing groove (12). The small end (521) is provided with a group of protruding deformed teeth (524). The deformed teeth (524) are in contact with the inner wall of the fixing groove (12). The fixing bolt (52) A narrow and long air bag (525) is provided inside, and the air bag (525) is arranged along the axis of the fixing bolt (52) and its two ends are respectively arranged facing the bulge (523) and the deformed thread opening (524). A side of the air bag (525) close to the deformed thread opening (524) is connected to a group of air guide holes (526), ​​and the end of each air guide hole (526) faces the corresponding deformed thread opening (524). The bulge (523) and the inflated deformed thread opening (524) are both in interference contact with the inner wall of the fixing groove (12); The sealing lip (53) comprises an upper sealing lip (531), a middle sealing lip and a lower sealing lip (532). The tail of the lower sealing lip (533) is connected to a hooking boss (5331). A clamping lip (5332) is further provided at the connection between the lower sealing lip (533) and the fixing bolt (52). The inner wall of the bearing outer ring (2) is provided with a supporting platform (21), a sealing groove 1 (22) and a sealing groove 2 (23) in sequence from top to bottom. The inner side of the sealing groove 2 (23) is provided with an upward clamping groove (231). ), the upper sealing lip (531) overlaps the supporting platform (21) of the bearing outer ring (2), the middle sealing lip (532) extends into the sealing groove 1 (22), the lower sealing lip (533) extends into the sealing groove 2 (23) and its tail is embedded in the clamping groove (231), the hook boss (5331) just abuts against the innermost side of the sealing groove 2 (23), the clamping lip (5332) abuts against the inner wall of the bearing inner ring (1), and the sealing lip (53) contacts the bearing inner ring (1) and the bearing outer ring (2) to form a sealing cavity.

2. The high-security grease-leakage-proof wind turbine variable pitch bearing according to claim 1 is characterized in that: The right side of the lower sealing belt (6) is an L-shaped mounting handle (61), and a group of snap-fit ​​strips (6111) are provided on the vertical section (611) of the mounting handle (61). The lower surface of the bearing inner ring (1) is provided with a concave step platform 2 (13) and a vertical mounting groove (14), and the mounting groove (14) is provided with a transverse groove (141). The vertical section (611) of the mounting handle (61) is embedded in the mounting groove (14), and the snap-fit ​​strip (6111) is embedded in the groove (141) and is in interference contact with the inner wall of the mounting groove (14), and the transverse section (612) of the mounting handle (61) is against the step platform 2 (13).

3. The high-security grease-leakage-proof wind turbine variable pitch bearing according to claim 2 is characterized in that: The left side of the lower sealing belt (6) is provided with a first oil sealing lip (62), a second oil sealing lip (63), a third oil sealing lip (64), a first dustproof lip (65) and a second dustproof lip (66); the angle between the second oil sealing lip (63) and the third oil sealing lip (64) is an acute angle; the first oil sealing lip (62) is provided between the second oil sealing lip (63) and the vertical section (611) of the mounting handle (61) and contacts with the inner and outer rings of the bearing to form a sealing cavity; The inner wall of the bearing outer ring (2) is provided with a vertical oil sealing groove (24), a transverse oil sealing groove (25), a first dustproof platform (26) and a second dustproof platform (27) in sequence from top to bottom; the second oil sealing lip (63) is embedded in the vertical oil sealing groove (24); the third oil sealing lip (64) is embedded in the transverse oil sealing groove (25); the first dustproof lip (65) is engaged with the first dustproof platform (26); and the second dustproof lip (66) is overlapped on the second dustproof platform (27).

4. The high-security grease-leakage-proof wind turbine variable pitch bearing according to claim 3 is characterized in that: The two dustproof platforms (27) are arranged at an incline, and the angle between them and the vertical direction is smaller than the angle between the two dustproof lips (66) and the vertical direction.

5. The wind turbine pitch bearing with high safety and grease leakage prevention according to any one of claims 1 to 4, characterized in that: The card platform (51) is an inverted trapezoidal structure, and its width gradually decreases from top to bottom.

6. The wind turbine pitch bearing with high safety and grease leakage prevention according to any one of claims 1 to 4, characterized in that: The lengths of the upper sealing lip (531) and the lower sealing lip (533) are both greater than the length of the middle sealing lip (532), and the corresponding length of the second sealing groove (23) is greater than the length of the first sealing groove (22).

7. The high-security grease-leakage-proof wind turbine pitch bearing according to any one of claims 1 to 4, characterized in that: The transition portion between the second sealing groove (23) and the inner wall of the bearing outer ring (2) is provided as an inclined slope section (232), and the slope section (232) is arranged obliquely upward so that the opening of the second sealing groove (23) gradually becomes smaller.

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