Variable pitch bearing for wind power generation

Abstract

The utility model relates to the technical field of variable pitch bearings, in particular to a variable pitch bearing for wind power generation, which comprises an outer ring and an inner ring, the outer ring is sleeved outside the inner ring, an annular groove is arranged on the inner surface of the outer ring, a convex ring is mounted on the outer side surface of the inner ring, one end of the convex ring extends into the annular groove, and a plurality of first mounting grooves are arranged on two sides of the convex ring. A ball is arranged in each first mounting groove, annular guide grooves are formed in the two sides of the interior of the annular groove, one end of each ball extends into the corresponding annular guide groove, the side face of one end of each ball makes contact with the side face of the corresponding annular guide groove, a plurality of second mounting grooves are formed in the outer surface of the convex ring, and a rolling shaft is rotationally connected into each second mounting groove. Through cooperation of the convex ring and the annular groove, the inner ring can be preliminarily limited, then the inner ring can be secondarily limited through the limiting baffle, the connection stability between the inner ring and the outer ring is improved, and the installation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pitch bearings, in particular to a pitch bearing for wind power generation. Background Technique

[0002] The pitch bearing is a rotating connecting component between the blade and the hub of a wind turbine generator and is a key component in the electric pitch system.

[0003] When the existing pitch bearing is installed, the outer ring is fixed to the hub of the wind turbine generator through bolts, and the inner ring is fixed to the blade. However, due to the lack of a limiting mechanism between the outer ring and the inner ring, during use, the inner ring and the outer ring will be separated under the influence of axial force, resulting in poor installation effect. Moreover, during use, the outer ring and the mounting holes on the outer ring are exposed to the external environment, causing the outer ring and the mounting holes to be corroded by the external environment. Due to the relatively concentrated internal stress in the mounting holes during use, the pitch bearing will be damaged, resulting in poor use effect. Therefore, we propose a pitch bearing for wind power generation. Content of the Utility Model

[0004] The purpose of the utility model is to solve the above-mentioned disadvantages existing in the prior art and propose a pitch bearing for wind power generation.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: design a pitch bearing for wind power generation, including an outer ring and an inner ring, the outer ring is sleeved outside the inner ring, and: an annular groove is opened on the inner surface of the outer ring, a convex ring is installed on the outer side surface of the inner ring, and one end of the convex ring extends into the annular groove;

[0006] A plurality of first mounting grooves are opened on both sides of the convex ring, a ball is arranged inside each first mounting groove, annular guide grooves are opened on both sides inside the annular groove, one end of the ball extends into the annular guide groove, and the side surface of one end of the ball is in contact with the side surface of the annular guide groove;

[0007] A plurality of second mounting grooves are opened on the outer surface of the convex ring, a roller is rotatably connected inside each second mounting groove, one side of each roller extends outside the second mounting groove, and the side surface of the roller is in contact with the inner end surface inside the annular groove;

[0008] Limiting baffles are arranged on both the upper and lower sides of the outer ring, and the inner side of each limiting baffle extends to the side surface of the inner ring. A plurality of first mounting holes are opened on the side surface of each limiting baffle, a plurality of second mounting holes are opened on the top side surface of the outer ring, the second mounting holes and the first mounting holes are arranged correspondingly, and a plurality of fastening bolts are arranged on one side of one of the limiting baffles. One end of the fastening bolt slidably penetrates through the corresponding first mounting hole and the second mounting hole;

[0009] Second sealing rings are installed on both sides of the outer ring. The second sealing rings are located between the limit baffle and the outer ring. When the limit baffle is fixed on the outer ring, the side surface of the limit baffle abuts against the side surface of the second sealing ring.

[0010] A first sealing ring is installed at one end of one of the limit baffles away from the outer ring. A connecting gasket is installed at one end of the screw head of the fastening bolt. When the fastening bolt is tightened, the side surface of the connecting gasket abuts against the side surface of the first sealing ring.

[0011] Preferably, a plurality of positioning holes are provided at the top of the inner ring.

[0012] Preferably, when the limit baffle is fixed on the outer ring, there is a gap between the inner surface of the limit baffle and the positioning holes provided at the top of the inner ring.

[0013] Preferably, a toothed ring is installed on the inner surface of the inner ring.

[0014] Preferably, the outer surface edge of the limit baffle is aligned with the outer surface edge of the outer ring.

[0015] Preferably, when the fastening bolt is tightened, the side surface of the limit baffle has a clearance fit with the side surface of the inner ring.

[0016] Preferably, oil films are provided on the surfaces of both the inner ring and the outer ring.

[0017] The beneficial effects of the design solution proposed by the present utility model in the application process are as follows:

[0018] Through the cooperation of the convex ring and the annular groove, the inner ring can be preliminarily positioned, and then the inner ring can be secondarily positioned through the limit baffle, increasing the connection stability between the inner ring and the outer ring and improving the installation effect.

[0019] Through the cooperation of the first sealing ring and the fastening bolt, the first installation hole and the second installation hole can be sealed, preventing the interiors of the first installation hole and the second installation hole from being corroded by the external environment. Furthermore, through the second sealing ring, the gap between the limit baffle and the outer ring is sealed, preventing the outer ring from being corroded by the external environment and improving the service effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the structural exploded view of the present utility model;

[0021] Figure 2 is the top view of the present utility model;

[0022] Figure 3 is the schematic structural view of the inner ring of the present utility model;

[0023] Figure 4 is the schematic structural view of the outer ring of the present utility model.

[0024] In the figure: 1. Limit baffle; 2. First mounting hole; 3. Outer ring; 4. Second mounting hole; 5. Roller; 6. Ball; 7. Inner ring; 8. Positioning hole; 9. First sealing ring; 10. Fastening bolt; 11. Connecting gasket; 12. Tooth ring; 13. First mounting groove; 14. Second mounting groove; 15. Convex ring; 16. Second sealing ring; 17. Annular guiding groove; 18. Annular groove. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] Refer to Figures 1 - 4 , a pitch bearing for wind power generation, including an outer ring 3 and an inner ring 7. The outer ring 3 is sleeved outside the inner ring 7, and: an annular groove 18 is formed on the inner surface of the outer ring 3, and a convex ring 15 is installed on the outer side surface of the inner ring 7. One end of the convex ring 15 extends into the annular groove 18. When the outer ring 3 and the inner ring 7 are installed together, the convex ring 15 will extend into the annular groove 18, so that the installation of the inner ring 7 and the outer ring 3 can be more stable.

[0027] As Figure 1 , Figure 3 and Figure 4 shown, a plurality of first mounting grooves 13 are formed on both sides of the convex ring 15. A ball 6 is arranged inside each first mounting groove 13. Annular guiding grooves 17 are formed on both sides inside the annular groove 18. One end of the ball 6 extends into the annular guiding groove 17, and the side surface of one end of the ball 6 is in contact with the side surface of the annular guiding groove 17. During actual use, when the inner ring 7 is installed in the outer ring 3, the ball 6 will contact the inner wall of the annular guiding groove 17, so that the friction force when the inner ring 7 and the outer ring 3 rotate relative to each other can be reduced.

[0028] As Figure 1 , Figure 3 and Figure 4 shown, a plurality of second mounting grooves 14 are formed on the outer surface of the convex ring 15. A roller 5 is rotatably connected inside each second mounting groove 14. One side of each roller 5 extends outside the second mounting groove 14, and the side surface of the roller 5 is in contact with the inner end surface inside the annular groove 18. During actual use, the roller 5 can rotate when the inner ring 7 and the outer ring 3 rotate relative to each other, and the friction force between the inner ring 7 and the outer ring 3 can be reduced.

[0029] As Figure 1 and Figure 2As shown in the figure, limiting baffles 1 are provided on both the upper and lower sides of the outer ring 3, and the inner sides of each limiting baffle 1 extend to the side surface of the inner ring 7. A number of first mounting holes 2 are provided on the side surface of each limiting baffle 1, and a number of second mounting holes 4 are provided on the top side surface of the outer ring 3. The second mounting holes 4 are arranged corresponding to the first mounting holes 2. A number of fastening bolts 10 are provided on one side of one of the limiting baffles 1. One end of the fastening bolt 10 slidably penetrates through the corresponding first mounting hole 2 and the second mounting hole 4. During the actual installation process, after the outer ring 3 and the inner ring 7 are fixed together, the limiting baffle 1 is placed at the preset position on the outer ring 3, so that the first mounting hole 2 on the limiting baffle 1 is aligned with the second mounting hole 4 on the outer ring 3. Then, the fastening bolt 10 is observed through the first mounting hole 2 and the second mounting hole 4, and the pitch bearing is fixed on the hub through the fastening bolt 10, and the installation can be completed.

[0030] It should be noted that when the fastening bolt 10 is tightened, the side surface of the limiting baffle 1 has a clearance fit with the side surface of the inner ring 7. In this way, the inner ring 7 can be secondarily limited through the limiting baffle 1, further increasing the stability between the inner ring 7 and the outer ring 3.

[0031] It should be noted that as Figure 2 shown, the outer surface edge of the limiting baffle 1 is aligned with the outer surface edge of the outer ring 3. In this way, when installing the pitch bearing, the limiting baffle 1 will not cause interference.

[0032] As Figure 1 shown, second sealing rings 16 are installed on both sides of the outer ring 3. The second sealing rings 16 are both located between the limiting baffle 1 and the outer ring 3. When the limiting baffle 1 is fixed on the outer ring 3, the side surface of the limiting baffle 1 abuts against the side surface of the second sealing ring 16. During the actual installation process, when the limiting baffle 1 and the outer ring 3 are fixed together, the second sealing ring 16 will seal the gap between the outer ring 3 and the limiting baffle 1, preventing the outer ring 3 from being corroded by the external environment.

[0033] As Figure 1 and Figure 2 shown, a first sealing ring 9 is installed at one end of one of the limiting baffles 1 away from the outer ring 3, and a connecting gasket 11 is installed at one end of the screw head of the fastening bolt 10. When the fastening bolt 10 is tightened, the side surface of the connecting gasket 11 abuts against the side surface of the first sealing ring 9. During the actual use process, when the fastening bolt 10 is tightened, the connecting gasket 11 will squeeze the first sealing ring 9 to seal the gap between the fastening bolt 10 and the first mounting hole 2, so as to prevent the inside of the first mounting hole 2 and the second mounting hole 4 from communicating with the external environment and being corroded.

[0034] Specifically, during the installation of the present utility model, the staff first installs the inner ring 7 inside the outer ring 3, so that the convex ring 15 extends into the annular groove 18. In this way, through the cooperation of the convex ring 15 and the annular groove 18, the inner ring 7 can be preliminarily limited. Then, the limit baffle 1 is placed at the preset position on the outer ring 3, so that the first installation hole 2 is aligned with the second installation hole 4. After that, the fastening bolt 10 is inserted into the corresponding first installation hole 2 and second installation hole 4, and screwed into the threaded hole of the hub on the wind turbine, then the pitch bearing can be fixed. Under the action of the limit baffle 1, the inner ring 7 can be secondarily limited, improving the connection stability between the inner ring 7 and the outer ring 3. And during the installation process, under the action of the second sealing ring 16, the outer ring 3 can be blocked to prevent the outer ring 3 from being oxidized and corroded by the external environment. Through the cooperation of the first sealing ring 9 and the connecting gasket 11, the first installation hole 2 and the second installation hole 4 can be sealed to prevent the inside of the first installation hole 2 and the second installation hole 4 from being rusted by the external environment, improving the use effect.

[0035] Furthermore, as Figure 3 shown, a number of positioning holes 8 are provided at the top of the inner ring 7. During the installation process, the positioning rod at the end of the wind turbine blade will be inserted into the positioning holes 8 on the inner ring 7, fixing the blade and the inner ring 7 together firmly.

[0036] Furthermore, as Figure 2 shown, when the limit baffle 1 is fixed on the outer ring 3, there is a distance between the inner surface of the limit baffle 1 and the positioning holes 8 provided at the top of the inner ring 7, so that the limit baffle 1 will not interfere with the installation of the blade.

[0037] Furthermore, as shown in the figure, a toothed ring 12 is installed on the inner surface of the inner ring 7. During use, the toothed ring 12 will mesh with the gear connected to the drive motor installed inside the hub of the wind turbine, so that the drive motor can drive the inner ring 7 to rotate, and then the angle of the blade can be adjusted.

[0038] Furthermore, oil films are provided on the surfaces of both the inner ring 7 and the outer ring 3. Through the oil films, the inner ring 7 and the outer ring 3 can be protected against rust, extending the service life of the inner ring 7 and the outer ring 3.

[0039] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A pitch bearing for wind power generation, comprising an outer ring (3) and an inner ring (7), characterized in that: The outer ring (3) is sleeved outside the inner ring (7), and: an annular groove (18) is provided on the inner surface of the outer ring (3), a convex ring (15) is installed on the outer side surface of the inner ring (7), and one end of the convex ring (15) extends into the annular groove (18); A number of first mounting grooves (13) are provided on both sides of the convex ring (15), a ball (6) is provided inside each first mounting groove (13), annular guide grooves (17) are provided on both inner sides of the annular groove (18), one end of the ball (6) extends into the annular guide groove (17), and the side surface of one end of the ball (6) is in contact with the side surface of the annular guide groove (17); A number of second mounting grooves (14) are provided on the outer surface of the convex ring (15), a roller (5) is rotatably connected inside each second mounting groove (14), one side of each roller (5) extends outside the second mounting groove (14), and the side surface of the roller (5) is in contact with the inner end surface of the annular groove (18); Limit baffles (1) are provided on both the upper and lower sides of the outer ring (3), and the inner side of each limit baffle (1) extends to the side surface of the inner ring (7). A number of first mounting holes (2) are provided on the side surface of each limit baffle (1), a number of second mounting holes (4) are provided on the top side surface of the outer ring (3), the second mounting holes (4) are arranged corresponding to the first mounting holes (2), a number of fastening bolts (10) are provided on one side of one of the limit baffles (1), and one end of the fastening bolt (10) slidably penetrates through the corresponding first mounting hole (2) and the second mounting hole (4); Second sealing rings (16) are installed on both sides of the outer ring (3), and the second sealing rings (16) are both located between the limit baffle (1) and the outer ring (3). When the limit baffle (1) is fixed on the outer ring (3), the side surface of the limit baffle (1) abuts against the side surface of the second sealing ring (16); A first sealing ring (9) is installed at one end of one of the limit baffles (1) away from the outer ring (3), and a connecting gasket (11) is installed at one end of the screw head of the fastening bolt (10). When the fastening bolt (10) is tightened, the side surface of the connecting gasket (11) abuts against the side surface of the first sealing ring (9).

2. The pitch bearing for wind power generation according to claim 1, wherein: A number of positioning holes (8) are provided on the top of the inner ring (7).

3. The pitch bearing for wind power generation according to claim 2, wherein: When the limit baffle (1) is fixed on the outer ring (3), there is a gap between the inner surface of the limit baffle (1) and the positioning holes (8) provided on the top of the inner ring (7).

4. A pitch bearing for wind power generation according to claim 1, characterized in that: A toothed ring (12) is installed on the inner surface of the inner ring (7).

5. The pitch bearing for wind power generation according to claim 1, wherein: The outer surface edge of the limit baffle (1) is aligned with the outer surface edge of the outer ring (3).

6. The pitch bearing for wind power generation according to claim 1, wherein: When the fastening bolt (10) is tightened, the side surface of the limit baffle (1) has a clearance fit with the side surface of the inner ring (7).

7. A pitch bearing for wind power generation according to claim 1, characterized in that: Oil films are provided on the surfaces of both the inner ring (7) and the outer ring (3).

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