Double-oil-way bearing structure of wind driven generator

Abstract

The invention discloses a double-oil-way bearing structure of a wind driven generator, relates to the technical field of bearing structures, and provides the following scheme aiming at the problems of poor lubrication and heating of a bearing in a single-oil-way two-bearing structure in the prior art: the double-oil-way bearing structure comprises a bearing seat, one side of the bearing seat is provided with an oil stop ring; the side, away from the bearing seat, of the oil stop ring is connected with an outer bearing cover, the annular inner wall of the outer bearing cover is connected with an outer oil slinger, a deep groove ball bearing is arranged on one side of the outer oil slinger, and a check ring is attached to the outer wall of the other side of the outer oil slinger. When the deep groove ball bearing is lubricated, grease enters the deep groove ball bearing along the oil injection channel through the oil injection hole, when the cylindrical roller bearing is lubricated, grease enters the cylindrical roller bearing along the oil injection channel through the hole to lubricate the two bearings, and waste grease flows into the oil receiving shell through the oil discharge hole after the bearings are lubricated by the grease. And the two bearings are lubricated through respective oil injection channels.

Description

Technical Field

[0001] The invention relates to the technical field of bearing structures, and in particular to a bearing structure with dual oil circuits for a wind turbine generator. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and ultimately outputs alternating current. A wind turbine generally consists of a wind rotor, a generator (including a device), a stabiliser (tail wing), a tower, a speed limit safety mechanism and an energy storage device. The working principle of a wind turbine is relatively simple. The wind rotor rotates under the action of wind force, and it converts the kinetic energy of the wind into the mechanical energy of the wind rotor shaft. The generator rotates and generates electricity driven by the wind rotor shaft. Broadly speaking, wind energy is also solar energy, so it can also be said that a wind turbine is a heat energy generator that uses the sun as a heat source and the atmosphere as a working medium.

[0003] At present, due to the heavy weight and high speed of the rotor of high-power double-fed asynchronous wind turbines, a three-bearing structure is required when selecting bearings:

[0004] The driving end uses a deep groove ball bearing + cylindrical roller bearing, and the non-driving end uses a cylindrical roller bearing. The two bearings at the driving end share one oil circuit. This single oil circuit structure will cause poor lubrication of the bearing far from the lubrication point, resulting in overheating of the bearing. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a wind turbine dual-oil-circuit bearing structure, which overcomes the deficiencies of the prior art and effectively solves the problems of poor bearing lubrication and heating in the dual-bearing structure with a single oil circuit in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A bearing structure with dual oil circuits for a wind turbine generator comprises a bearing seat, an oil stop ring is arranged on one side of the bearing seat, and an outer bearing cover is connected to the side of the oil stop ring away from the bearing seat, an outer oil slinging ring is connected to the annular inner wall of the outer bearing cover, and a deep groove ball bearing is arranged on one side of the outer oil slinging ring, a retaining ring is fitted on the outer wall of the other side of the outer oil slinging ring, an oil slinging ring is arranged on the side of the deep groove ball bearing away from the outer oil slinging ring, and an inner oil slinging ring is arranged on the inner side of the oil slinging ring, a cylindrical roller bearing is arranged on the side of the inner oil slinging ring away from the deep groove ball bearing, and an inner bearing cover is arranged on one side of the cylindrical roller bearing.

[0008] Preferably, the bearing seat is fixed on the external end cover, and the inner hole of the bearing seat and the cylindrical roller bearing are matched with a small clearance.

[0009] Preferably, a short bolt is screwed on one side of the outer wall of the oil stop ring, and the oil stop ring is connected and fixed to the bearing seat by the short bolt, and an O-ring is installed at the inner hole of the oil stop ring for radial fixation of the deep groove ball bearing.

[0010] Preferably, both ends of the outer wall of one side of the outer bearing cover are threaded with fastening bolts, and the outer bearing cover is connected and fixed to the oil stop ring by the fastening bolts.

[0011] Preferably, the outer oil-slinging ring, the deep groove ball bearing, the inner oil-slinging ring and the cylindrical roller bearing are all heat-shrink-fitted onto a rotating shaft, and the inner bearing cover is mounted on the rotating shaft.

[0012] Preferably, the annular outer wall of the inner bearing cover is screwed with long bolts, and the inner bearing cover is fixed to the bearing seat by the long bolts.

[0013] Preferably, the oil deflector ring is located between the cylindrical roller bearing and the oil stop ring, and the oil deflector ring is axially fixed by a connected compression spring.

[0014] Preferably, an oil filling hole is opened on one side of the annular outer wall of the oil stop ring, and the oil filling hole is connected to a first oil filling channel interconnected with the deep groove ball bearing. A through hole is opened on the other side of the annular outer wall of the oil stop ring, and the through hole is connected to a second oil filling channel interconnected with the cylindrical roller bearing.

[0015] Preferably, an oil drain hole is provided at the bottom end of the annular outer wall of the inner oil slinger ring, and an oil collecting shell is inserted into the bottom end of the oil drain hole.

[0016] The beneficial effects of the present invention are:

[0017] When the deep groove ball bearing is lubricated, the grease enters the deep groove ball bearing through the oil injection hole and along the oil injection channel. When the cylindrical roller bearing is lubricated, the grease enters the cylindrical roller bearing through the hole and along the oil injection channel to lubricate the two bearings. After the grease lubricates the bearings, the waste grease flows into the oil receiving shell through the oil discharge hole. The two bearings are lubricated through their respective oil injection channels, which solves the technical problems of poor bearing lubrication and heating in the existing two-bearing structure with a single oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic cross-sectional view of the overall structure of a bearing structure with dual oil circuits for a wind turbine proposed by the present invention;

[0019] Figure 2 A schematic diagram of a lubrication structure of a deep groove ball bearing of a wind turbine dual oil circuit bearing structure proposed by the present invention;

[0020] Figure 3 A schematic diagram of the lubrication structure of a cylindrical roller bearing of a wind turbine dual oil circuit bearing structure proposed by the present invention;

[0021] Figure 4 This is a schematic diagram of the overall structural operation direction of a bearing structure with dual oil circuits for a wind turbine proposed by the present invention.

[0022] In the figure: 1. bearing seat; 2. short bolt; 3. long bolt; 4. oil stop ring; 5. outer bearing cover; 6. outer oil ring; 7. deep groove ball bearing; 8. retaining ring; 9. O-ring; 10. fastening bolt; 11. oil drain hole; 12. oil receiving shell; 13. compression spring; 14. oil stop ring; 15. inner oil ring; 16. rotating shaft; 17. cylindrical roller bearing; 18. inner bearing cover; 19. oil filling hole; 20. first oil filling channel; 21. through hole; 22. second oil filling channel. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example:

[0025] Reference Figure 1-4 A bearing structure of a wind turbine with double oil circuits, comprising a bearing seat 1, an oil stop ring 4 is arranged on one side of the bearing seat 1, an outer bearing cover 5 is connected to the side of the oil stop ring 4 away from the bearing seat 1, an outer oil slinging ring 6 is connected to the annular inner wall of the outer bearing cover 5, a deep groove ball bearing 7 is arranged on one side of the outer oil slinging ring 6, a retaining ring 8 is attached to the outer wall of the other side of the outer oil slinging ring 6, an oil slinging ring 14 is arranged on the side of the deep groove ball bearing 7 away from the outer oil slinging ring 6, an inner oil slinging ring 15 is arranged on the inner side of the oil slinging ring 14, a cylindrical roller bearing 17 is arranged on the side of the inner oil slinging ring 15 away from the deep groove ball bearing 7, and an inner bearing cover 18 is arranged on one side of the cylindrical roller bearing 17;

[0026] The bearing seat 1 is fixed on the external end cover, and the inner hole of the bearing seat 1 and the cylindrical roller bearing 17 are matched with a small gap. The bearing seat 1 is connected and fixed with the external end cover to support the operation of the rotating shaft 16. A short bolt 2 is screwed on one side of the outer wall of the oil stop ring 4. The oil stop ring 4 is connected and fixed to the bearing seat 1 through the short bolt 2. An O-ring 9 is installed at the inner hole of the oil stop ring 4 for radial fixation of the deep groove ball bearing 7. The oil stop ring 4 is fixed on the bearing seat 1 through the short bolt 2, and the deep groove ball bearing 7 is radially fixed by the O-ring 9;

[0027] Both ends of the outer wall of one side of the outer bearing cover 5 are screwed with fastening bolts 10, the outer bearing cover 5 is connected and fixed with the oil stop ring 4 by the fastening bolts 10, the outer bearing cover 5 is fixed on the oil stop ring 4 by the fastening bolts 10, the outer oil slinger ring 6, the deep groove ball bearing 7, the inner oil slinger ring 15 and the cylindrical roller bearing 17 are heat-shielded with a rotating shaft 16, the inner bearing cover 18 is installed on the rotating shaft 16, the annular outer wall of the inner bearing cover 18 is screwed with a long bolt 3, and the inner bearing cover 18 is fixed to the bearing seat 1 by the long bolt 3;

[0028] The oil retaining ring 14 is located between the cylindrical roller bearing 17 and the oil stop ring 4. The oil retaining ring 14 is axially fixed by the connected compression spring 13. The oil retaining ring 14 is axially fixed by the set compression spring 13. An oil filling hole 19 is opened on one side of the annular outer wall of the oil stop ring 4. The oil filling hole 19 is connected to a first oil filling channel 20 interconnected with the deep groove ball bearing 7. A through hole 21 is opened on the other side of the annular outer wall of the oil stop ring 4. The through hole 21 is connected to a second oil filling channel 20 interconnected with the cylindrical roller bearing 17. The oil injection passage 22, when the deep groove ball bearing 7 is lubricated, the grease enters the deep groove ball bearing 7 through the oil injection hole 19 along the oil injection passage 20, and when the cylindrical roller bearing 17 is lubricated, the grease enters the cylindrical roller bearing 17 through the hole 21 along the oil injection passage 22, so as to lubricate the two bearings. The bottom end of the annular outer wall of the inner oil slinger 15 is provided with an oil discharge hole 11, and the bottom end of the oil discharge hole 11 is connected with an oil receiving shell 12. After the grease lubricates the bearing, the waste grease flows into the oil receiving shell 12 through the oil discharge hole 11.

[0029] When the deep groove ball bearing 7 is lubricated, grease enters the deep groove ball bearing 7 through the oil injection hole 19 and along the oil injection channel 20. When the cylindrical roller bearing 17 is lubricated, grease enters the cylindrical roller bearing 17 through the hole 21 and along the oil injection channel 22 to lubricate the two bearings. After the grease lubricates the bearings, the waste grease flows into the oil receiving shell 12 through the oil discharge hole 11. The two bearings are lubricated through their respective oil injection channels.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wind turbine dual oil circuit bearing structure, comprising a bearing seat (1), characterized in that: An oil stop ring (4) is provided on one side of the bearing seat (1), and an outer bearing cover (5) is connected to the side of the oil stop ring (4) away from the bearing seat (1); an outer oil slinger ring (6) is connected to the annular inner wall of the outer bearing cover (5), and a deep groove ball bearing (7) is provided on one side of the outer oil slinger ring (6); a retaining ring (8) is attached to the outer wall of the other side of the outer oil slinger ring (6); an oil slinger ring (14) is provided on the side of the deep groove ball bearing (7) away from the outer oil slinger ring (6), and an inner oil slinger ring (15) is provided on the inner side of the oil slinger ring (14); a cylindrical roller bearing (17) is provided on the side of the inner oil slinger ring (15) away from the deep groove ball bearing (7), and an inner bearing cover (18) is provided on one side of the cylindrical roller bearing (17).

2. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: The bearing seat (1) is fixed on the external end cover, and the inner hole of the bearing seat (1) and the cylindrical roller bearing (17) are matched with a small clearance.

3. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: A short bolt (2) is screwed onto one side of the outer wall of the oil stop ring (4), and the oil stop ring (4) is connected and fixed to the bearing seat (1) via the short bolt (2). An O-ring (9) is installed at the inner hole of the oil stop ring (4) for radial fixation of the deep groove ball bearing (7).

4. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: Both ends of the outer wall of one side of the outer bearing cover (5) are screwed with fastening bolts (10), and the outer bearing cover (5) is connected and fixed to the oil stop ring (4) via the fastening bolts (10).

5. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: The outer oil-slinging ring (6), the deep groove ball bearing (7), the inner oil-slinging ring (15) and the cylindrical roller bearing (17) are heat-shielded on a rotating shaft (16), and the inner bearing cover (18) is installed on the rotating shaft (16).

6. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: A long bolt (3) is screwed onto the annular outer wall of the inner bearing cover (18), and the inner bearing cover (18) is fixed to the bearing seat (1) via the long bolt (3).

7. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: The oil deflector ring (14) is located between the cylindrical roller bearing (17) and the oil stop ring (4), and the oil deflector ring (14) is axially fixed by a connected compression spring (13).

8. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: An oil injection hole (19) is provided on one side of the annular outer wall of the oil stop ring (4), and a first oil injection channel (20) is connected to the oil injection hole (19) and is interconnected with the deep groove ball bearing (7); a through hole (21) is provided on the other side of the annular outer wall of the oil stop ring (4), and a second oil injection channel (22) is connected to the through hole (21) and is interconnected with the cylindrical roller bearing (17).

9. A wind turbine dual oil circuit bearing structure according to claim 1, characterized in that: An oil discharge hole (11) is provided at the bottom end of the annular outer wall of the inner oil slinger ring (15), and an oil receiving shell (12) is inserted into the bottom end of the oil discharge hole (11).

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