Novel double-fed asynchronous wind turbine generator bearing structure

Abstract

The utility model discloses a novel double-fed asynchronous wind turbine generator bearing structure which comprises a bearing outer cover, an outer bearing, an inner bearing, a bearing inner cover, an oil flinger and an inner oil seal. The bearing outer cover is arranged on the outer side of the outer bearing to form an outer bearing chamber, and the bearing inner cover is arranged on the outer side of the inner bearing to form an inner bearing chamber; oil injection holes are formed in the upper portion of the outer bearing chamber and the upper portion of the inner bearing chamber, an oil way entering a bearing outer cover cavity is formed in the outer bearing chamber, and an oil way entering a bearing inner cover cavity is formed in the inner bearing chamber. The oil flinger is arranged between the outer bearing and the inner bearing; the bearing inner cover and the inner oil seal are matched with each other through the groove part and the convex tooth part to form a longitudinally arranged multi-labyrinth structure; the utility model can effectively solve the problems of oil path blockage and grease waste caused by long oil injection path due to the fact that two bearing oil injection holes at the driving end are both arranged on the bearing outer cover, on the other hand, the labyrinth structure solves the grease leakage problem of a generator, and ensures the safe operation of a wind turbine generator.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine bearings, in particular to a novel double-fed asynchronous wind turbine bearing structure. Background Art

[0002] Doubly-fed asynchronous wind turbines currently use a "two-column and one-ball" bearing structure, i.e., a cylindrical roller bearing and a deep groove ball bearing at the drive end, and a single cylindrical roller bearing at the non-drive end. The bearings are lubricated with grease. The existing bearing unit structure has two shortcomings: first, the two bearing oil filling holes at the drive end are both set on the bearing outer cover, and the oil filling path is long, which is easy to cause oil blockage and grease waste; second, with the increase of the power of the doubly-fed generator, the air volume of the direct-cooled doubly-fed motor increases, and the internal pressure is affected. If the sealing structure of the bearing unit is insufficient, it is very easy for grease to enter the motor, causing internal contamination of the motor and lack of bearing grease. Grease entering the motor is easy to bring about the risk of fire, and insufficient grease is easy to cause poor bearing lubrication or even dry grinding of the bearing, resulting in bearing failure. Utility Model Content

[0003] The utility model aims to solve the deficiencies in the prior art and provide a new type of double-fed asynchronous wind turbine bearing structure, which can effectively prevent the oil blockage and grease waste caused by the long oil injection path in the prior structure, and on the other hand, the grease leakage problem inside the generator can be solved by setting a bearing unit maze structure. The optimization of the bearing unit structure saves the cost of the wind turbine, reduces the bearing failure caused by poor lubrication of the bearing, and ensures the safe and reliable operation of the wind turbine.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the utility model is as follows: a novel double-fed asynchronous wind turbine bearing structure, comprising a bearing outer cover, an outer bearing, an inner bearing, a bearing inner cover, an oil-slinging plate and an inner oil seal, wherein the outer bearing and the inner bearing are seal-mounted at the center of the end cover, the bearing outer cover is arranged on the outer side of the outer bearing to form an outer bearing chamber, and the bearing inner cover is arranged on the outer side of the inner bearing to form an inner bearing chamber; the upper parts of the outer bearing chamber and the inner bearing chamber are both provided with oil filling holes, and the outer bearing chamber is formed with an oil path entering the bearing outer cover cavity, and the inner bearing chamber is formed with an oil path entering the bearing inner cover cavity; the oil-slinging plate is arranged between the outer bearing and the inner bearing to fully lubricate the inner and outer bearings; the outer side of the bearing inner cover is formed with a plurality of grooves and sealing teeth, the inner oil seal is formed with a plurality of convex teeth matched with the grooves, and the bearing inner cover and the inner oil seal cooperate with each other through the grooves and the convex teeth to form a longitudinally arranged multiple labyrinth structure.

[0005] Furthermore, a waste oil collection channel is provided at the lower portion of the outer bearing chamber.

[0006] Furthermore, it also includes an outer oil seal and a grounding ring; the outer oil seal is arranged on the outer side of the bearing outer cover, and the grounding ring is connected to the outer oil seal.

[0007] Furthermore, an insulating bushing is provided between the outer bearing, the inner bearing and the end cover to block the shaft current loop.

[0008] Furthermore, the width of the groove portion is 6 mm, and the width of the convex tooth portion is 5 mm.

[0009] Furthermore, the lengths of the groove portion and the convex tooth portion are both 16 mm.

[0010] Furthermore, the total length of the multiple maze structure ranges from 100 to 125 mm.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0012] The utility model is aimed at a doubly-fed asynchronous wind turbine generator. By improving the existing bearing unit oil filling method and maze structure, it can effectively solve the problem that the two bearing oil filling holes at the driving end are both arranged on the bearing outer cover, the oil filling path is long, and it is easy to cause oil path blockage and grease waste. On the other hand, the optimization of the bearing unit maze structure can solve the generator grease leakage problem, avoid causing internal pollution of the motor and lack of bearing grease, and ensure the safe and reliable operation of the wind turbine generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the structure of the outer bearing and the upper part of the inner bearing. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with specific embodiments.

[0016] See also Figure 1 to Figure 2 As shown, the novel doubly-fed asynchronous wind turbine bearing structure provided in this embodiment includes a bearing outer cover 5, an outer bearing, an inner bearing, a bearing inner cover 9, an oil slinger 7, an inner oil seal 10, an outer oil seal 4 and a grounding ring 3;

[0017] The outer bearing and the inner bearing are seal-mounted in the center of the end cover 1, an insulating bushing 2 is provided between the outer bearing and the inner bearing and the end cover 1, the outer oil seal 4 is arranged on the outside of the bearing outer cover 5, and the grounding ring 3 is connected to the outer oil seal 4 to block the shaft current circuit.

[0018] The bearing outer cover 5 is arranged on the outer side of the outer bearing, forming an outer bearing chamber 6; the bearing inner cover 9 is arranged on the outer side of the inner bearing, forming an inner bearing chamber 8; the upper parts of the outer bearing chamber 6 and the inner bearing chamber 8 are both provided with oil filling holes, and the outer bearing chamber is provided with an oil passage 12 entering the bearing outer cover cavity, and the inner bearing chamber is provided with an oil passage 13 entering the bearing inner cover cavity, and the lower part of the outer bearing chamber 6 is provided with a waste oil collection channel 11; the oil slinger 7 is arranged between the outer bearing and the inner bearing, and is used to fully lubricate the inner and outer bearings;

[0019] The outer side of the bearing inner cover 9 is formed with three grooves and four circular sealing teeth 14, and the inner oil seal 10 is formed with three convex teeth 15 matched with the grooves. The bearing inner cover 9 and the inner oil seal 10 cooperate with each other through the grooves and the convex teeth 15 to form a longitudinally arranged triple maze structure; in this triple maze structure, the gap between the bearing inner cover 9 and the inner oil seal 10 shall not be greater than 0.5mm, that is, the groove width is 6mm, and the convex teeth width is 5mm. If the gap is too large, grease will easily pass through and cannot play a sealing role. If the gap is too small, interference between the bearing inner cover and the inner oil seal components is easy to occur; in addition, the convex teeth and the groove lengths of the maze of this structure are both 16mm, and the total length of the three mazes ranges from 100mm to 125mm.

[0020] The external automatic grease injection pump, according to a preset program, injects a certain amount of grease from the oil injection holes of the inner and outer bearing chambers through the two oil paths 12 and 13 into the cavity 16 of the bearing outer cover and the cavity 17 of the bearing inner cover, and then enters the bearing to lubricate the bearing. The oil-slinging plate 7 allows the two bearings to be fully lubricated and allows the waste grease to enter the waste oil collection box through the waste oil collection channel 11. At the same time, the three-way maze structure can successfully prevent the grease from entering the motor, causing pollution inside the motor and waste of grease, thereby ensuring the safe and reliable operation of the motor.

[0021] The embodiments described above are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made based on the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel double-fed asynchronous wind turbine bearing structure, comprising an end cover, a bearing outer cover, an outer bearing, an inner bearing and a bearing inner cover, wherein the outer bearing and the inner bearing are seal-mounted at the center of the end cover, the bearing outer cover is arranged on the outer side of the outer bearing to form an outer bearing chamber, and the bearing inner cover is arranged on the outer side of the inner bearing to form an inner bearing chamber, characterized in that: It also includes an oil-slinging pan and an inner oil seal; the upper parts of the outer bearing chamber and the inner bearing chamber are both provided with oil filling holes, and the outer bearing chamber is formed with an oil path entering the bearing outer cover cavity, and the inner bearing chamber is formed with an oil path entering the bearing inner cover cavity; the oil-slinging pan is arranged between the outer bearing and the inner bearing, and is used to fully lubricate the inner and outer bearings; the outer side of the bearing inner cover is formed with a plurality of grooves and sealing teeth, and the inner oil seal is formed with a plurality of convex teeth matching the grooves, and the bearing inner cover and the inner oil seal cooperate with each other through the grooves and the convex teeth to form a longitudinally arranged multiple maze structure.

2. According to claim 1, a novel double-fed asynchronous wind turbine bearing structure is characterized in that: A waste oil collection channel is provided at the lower part of the outer bearing chamber.

3. According to claim 1, a novel double-fed asynchronous wind turbine bearing structure is characterized in that: It also includes an outer oil seal and a grounding ring; the outer oil seal is arranged on the outer side of the bearing outer cover, and the grounding ring is connected to the outer oil seal.

4. The novel double-fed asynchronous wind turbine bearing structure according to claim 1 is characterized in that: An insulating bushing is provided between the outer bearing, the inner bearing and the end cover to block the shaft current loop.

5. The novel double-fed asynchronous wind turbine bearing structure according to claim 1 is characterized in that: The width of the groove portion is 6 mm, and the width of the convex tooth portion is 5 mm.

6. A novel double-fed asynchronous wind turbine bearing structure according to claim 1, characterized in that: The lengths of the groove portion and the convex tooth portion are both 16 mm.

7. The novel double-fed asynchronous wind turbine bearing structure according to claim 1 is characterized in that: The total length of the multiple maze structure ranges from 100 to 125 mm.

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