CN109958591B - Air cooling device of wind driven generator bearing and wind driven generator comprising same - Google Patents

Abstract

The invention discloses an air cooling device for a wind turbine bearing and a wind turbine comprising the same. The air cooling device is used for cooling the bearing and the bearing connecting parts of the wind turbine. The air cooling device includes an air inlet fan, an air outlet pipeline and a jet device. And the air transport duct, the jet device is used to spray the cooling air to the surface of the bearing and/or the surface of the bearing connecting part, one end of the air transport duct is connected with the air inlet fan, the other end of the air transport duct is connected with the jet device, the air outlet The piping and air transport piping are independent of each other. The invention transports the cooling air to the jet device through the air transport pipeline, and the jet device can spray the cooling air to the inner surface of the inner ring of the bearing and/or the inner surface of the bearing connecting part in the form of a high-speed jet, which solves the problem in the prior art. The defect of low convective heat transfer intensity of bearing air cooling improves the cooling efficiency of bearing air cooling.

Description

Air cooling device for wind turbine bearing and wind turbine including the same

technical field

The invention relates to the field of wind power generation, in particular to an air cooling device for a wind turbine bearing and a wind turbine comprising the same.

Background technique

Bearings are the core components of wind turbines, and they are also a high-incidence area for mechanical failures. When the bearing is running, the friction between the rollers and the track generates heat. If the heat cannot be dissipated in time and effectively, it will lead to excessive deformation of various parts of the bearing and the parts connected to the bearing. This will seriously affect the normal operation of the generator, and gradually destroy the bearing structure, shorten the bearing life, and eventually cause the bearing to fail to operate normally or even be damaged. Therefore, a reasonable bearing cooling design is a necessary guarantee for the normal operation of the generator set, especially for the permanent magnet direct drive generator set, the bearing volume is large and the heat generation is relatively large, so the importance of reasonable and effective cooling of the bearing is more prominent.

For existing wind turbines, liquid cooling or air cooling are usually used to control the bearing temperature within a reasonable range. Liquid cooling has the advantage of high cooling efficiency, and the upper limit of cooling power it can provide is often greater than the heat generation of existing bearings. However, the liquid cooling system inevitably involves problems such as corrosion, leakage, and antifreeze. Its cost is relatively high and requires regular maintenance. Therefore, bearing liquid cooling has only been applied on some models. The more widely used method today is Air cooling. Bearing air cooling has obvious advantages such as easy implementation, low cost and basically maintenance-free. A common form of air cooling is where the cooling air is driven by a fan near the bearing, and the cooling air flows over the partially exposed bearing surfaces, removing most of the heat generated by the bearing away from these surfaces. However, due to the limited effective heat dissipation area of the bearing air cooling and the convection heat transfer intensity of the air cooling is much lower than that of the liquid cooling, the cooling power provided by the existing bearing air cooling method is close to its limit. Air cooling may not even meet the cooling needs. Therefore, how to further improve the bearing air cooling efficiency, that is, the convective heat transfer intensity of air cooling, is of great significance for bearing design and operation, as well as bearing cooling design and implementation.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an air cooling device for a wind turbine bearing and a wind turbine including the same in order to overcome the defect of low convective heat transfer intensity of bearing air cooling in the prior art.

The present invention solves the above-mentioned technical problems through the following technical solutions:

An air cooling device for a bearing of a wind turbine, used for cooling a bearing and a bearing connection part of a wind turbine, the air cooling device comprises an air inlet fan and an air outlet pipe, and is characterized in that the air cooling device further comprises A jet device and an air transport duct, the jet device is used for spraying cooling air to the surface of the bearing and/or the surface of the bearing connecting part, one end of the air transport duct is connected with the air intake fan, so One end of the air transport duct away from the air inlet fan is connected to the jet device, and the air outlet duct and the air transport duct are independent of each other.

In this solution, the cooling air is entered by the air intake fan, and flows along the end of the air transport duct connected with the intake fan to the other end of the air transport duct, thereby entering the jet device, and then the jet device flows to the surface of the bearing and/or the bearing connecting part The surface is sprayed to achieve the purpose of cooling the bearing and the bearing connecting parts, and the heated air is discharged from the wind turbine through the air outlet pipe. The jet device sprays the cooling air to the surface of the bearing and/or the surface of the bearing connecting part in the form of high-speed jet, which enhances the strength of air convection heat transfer and enhances the effect of air cooling of the bearing.

Preferably, the fluidic device is fixed on the inner surface of the bearing and/or the inner surface of the bearing connecting part, the bearing is engaged with the bearing connecting part, the bearing includes an inner ring and an outer ring , the jet device is used for spraying cooling air to the inner surface of the inner ring and/or the inner surface of the bearing connecting part.

In this solution, the cooling air mainly cools the inner surface of the inner ring of the bearing and/or the inner surface of the bearing connecting part.

Preferably, the jet device includes at least one jet loop and a plurality of jet holes;

The jet ring pipe is connected to the end of the air transport pipe away from the air inlet fan, the jet ring pipe is formed by at least one circular arc pipe, and the outer diameter of the jet ring pipe is smaller than the inner diameter of the inner ring , the jet ring tube is coaxial with the bearing;

A plurality of the jet holes are arranged on the jet ring pipe, and are arranged on the radially outer side of the jet ring pipe, and are arranged at intervals along the circumferential direction of the jet ring pipe.

In this solution, the cooling air enters the jet ring pipe through the air transport pipe, and is sprayed to the inner surface of the inner ring and/or the inner surface of the bearing connecting part through the jet holes on the jet ring pipe, so as to achieve the cooling effect of the bearing and the bearing connecting part. Effect. The jet ring tube is coaxial with the bearing, and the jet hole is arranged on the jet ring tube, and is arranged on the radial outer side of the jet ring tube along the circumferential direction of the jet ring tube, so that the bearing can be cooled evenly. In order for the cooling air to be sprayed on the inner surface of the inner ring of the bearing and/or the inner surface of the bearing connecting part, the outer diameter of the jet ring tube needs to be smaller than the inner diameter of the inner ring. In order to ensure the cooling effect of the bearing, multiple jet rings can be arranged.

Preferably, when the jet device includes two or more jet loops arranged along the axial direction of the jet loop, two adjacent jet loops in the axial direction of the jet loop The distance between the jet rings is 4-20 times the diameter of the jet holes.

In this solution, when multiple jet rings are set up, the two adjacent jet rings in the axial direction of the jet rings need to meet a certain distance. While satisfying the bearing cooling effect, it is also necessary to ensure that the jet rings They do not affect each other and save costs.

Preferably, when the jet device includes two or more jet loops arranged along the axial direction of the jet loop, a plurality of the jet loops are connected to the air transport pipe at the joints. They are arranged staggered along the circumferential direction of the jet ring.

In this solution, the joints of the plurality of jet loops and the air transport pipes are staggered along the circumferential direction of the jet loops to prevent interference between the plurality of jet loops, and to facilitate installation and later maintenance.

Preferably, the jet device includes a jet channel, at least one jet nozzle and a plurality of jet holes;

One end of the jet channel is connected with one end of the air transport pipe away from the air intake fan, and the jet channel is formed by at least one pipeline;

One end of the jet nozzle is connected with one end of the jet channel away from the air transport pipe, and the jet nozzle is arranged along the circumferential direction of the inner ring;

The plurality of jet holes are arranged on the jet nozzle, and the jet holes are opposite to the inner surface of the inner ring, and the plurality of jet holes are arranged at intervals along the circumferential direction and the axial direction of the inner ring.

In this scheme, the cooling air enters the jet channel through the air transport pipe, then flows from the jet channel to the jet nozzle, and is sprayed to the inner ring from the jet hole on the jet nozzle to achieve the purpose of bearing cooling. The jet channel is connected by a plurality of pipelines, which is convenient for splicing and installation, as well as for later repair and maintenance. The arrangement of the jet nozzles along the circumferential direction of the inner ring and the arrangement of the jet holes along the circumferential and axial intervals of the inner ring are all to allow the bearing to cool down evenly.

Preferably, along the axial direction of the inner ring, the total axial length of the jet nozzle is greater than 1/2 of the total axial length of the inner ring.

In this solution, the total axial length of the jet nozzle should not be too short, otherwise the inner surface of the entire inner ring cannot be cooled.

Preferably, the included angle between the axial direction of the jet hole and the axial direction of the inner ring is 45°-90°, and the jet hole and the inner wall of the inner ring are along the radial direction of the bearing. The shortest distance between them does not exceed 200 mm and does not exceed 20 times the diameter of the jet hole.

In this solution, the angle between the axial direction of the jet hole and the axial direction of the inner ring is between 45°-90° and the shortest distance between the jet hole and the inner wall of the inner ring along the radial direction of the bearing is to prevent The jet intensity before the cooling air ejected through the jet holes reaches the inner surface of the inner ring is greatly attenuated.

Preferably, the distance between the two adjacent jet holes in the circumferential and axial directions of the inner ring is 2-10 times the diameter of the jet holes.

In this solution, the distance between the two adjacent jet holes in the circumferential or axial direction of the inner ring is to ensure that the bearing can be cooled evenly.

Preferably, the bend and the connection between the jet device and the air transport pipe adopt a structure with a smooth shape, which is used to reduce the high-speed airflow at the bend and the connection between the jet device and the air transport pipe. pressure loss in .

Preferably, the air outlet fan is arranged on the air outlet duct or the air outlet fan is arranged close to the air outlet duct.

In this solution, the air outlet fan is beneficial to promote the air flow out of the inside of the wind turbine.

A wind power generator includes a bearing and a bearing connecting part, the bearing connecting part is the central part of the stator, and is characterized in that the wind power generator further comprises the above-mentioned air cooling device for the wind power generator bearing.

The positive improvement effect of the present invention is that: the present invention transports the cooling air to the jet device through the air transport pipeline, and the jet device can spray the cooling air to the inner surface of the inner ring of the bearing and/or the bearing connecting part in the form of a high-speed jet. It solves the defect of low convective heat transfer intensity of bearing air cooling in the prior art, and improves the cooling efficiency of bearing air cooling.

Description of drawings

FIG. 1 is a schematic structural diagram of an air cooling device for a wind turbine and a wind turbine including the same according to Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of the jet device according to Embodiment 1 of the present invention.

FIG. 3 is a schematic structural diagram of a jet device according to Embodiment 2 of the present invention.

Description of reference numbers:

10 intake fan

20 Air Transport Ducts

30 Jet device

301 Jet Loop

302 jet hole

303 Jet channel

304 jet nozzle

40 Air outlet pipe

50 Exhaust fan

60 Bearings

601 inner ring

602 outer ring

70 Bearing connection parts

80 Cooling air

Detailed ways

The present invention is further described below by way of examples, but the present invention is not limited to the scope of the described examples.

Example 1

The invention provides an air cooling device for a wind generator bearing and a wind generator comprising the same, which are used for cooling the bearing of the wind generator. As shown in FIGS. 1-2 , the air cooling device includes an air intake fan 10 , an air transport duct 20 , a jet device 30 , an air outlet duct 40 and an air outlet fan 50 . In addition to the above-mentioned air cooling device, the wind turbine also includes a bearing 60 and a bearing connecting part 70, the bearing connecting part 70 is the central part of the stator, the jet device 30 is fixed on the inner surface of the bearing 60, and the air outlet pipe 40 Provided on the bearing connecting member 70, one end of the air outlet pipe 40 is communicated with the inside of the wind turbine, and the other end is communicated with the external environment of the wind turbine. In other alternative embodiments, the fluidic device 30 may also be disposed on the inner surface of the bearing 60 and/or on the inner surface of the bearing connecting member 70, or at least a portion of the fluidic device 30 needs to be close to the inner surface of the bearing 60 and/or Or the inner surface of the bearing connecting part 70 is arranged to achieve better cooling effect.

The jet device 30 is used to spray the cooling air 80 to the surface of the bearing 60 and the surface of the bearing connecting part 70 , especially the surface of the bearing connecting part 70 close to the bearing 60 . One end of the air transport duct 20 is connected to the air intake fan 10, one end of the air transport duct 20 away from the intake fan 10 is connected to the jet device 30, the air outlet duct 40 and the air transport duct 20 are independent of each other, and the air transport duct 20 is used to The cooling air 80 is transported from the air intake fan 10 to the jet device 30 . In other alternative embodiments, the jet device 30 is not limited to spraying the cooling air 80 to both the surface of the bearing 60 and the surface of the bearing connecting part 70 , at least to one of the surfaces, especially the bearing 60 . and/or the higher temperature surface of the bearing connection member 70 .

The bearing 60 includes two inner rings 601 and one outer ring 602. The inner ring 601 is fixed and the outer ring 602 can rotate. The temperature of the inner ring 601 and the outer ring 602 is caused by friction between the bearing rollers. The jet device 30 is mainly used to cool the temperature of the inner surface of the inner ring 601 and the temperature of the inner surface of the bearing connecting part 70 close to the bearing 60. The inner ring 601 is engaged with the bearing connecting part 70, and a part of the heat of the inner ring 601 is connected by the bearing. The part 70 is dissipated, and another part of the heat is taken away by the cooling air 80 injected by the jet device 30 . It should be noted that, in other alternative embodiments, the number of the inner ring 601 and the outer ring 602 is not limited to a fixed value, nor is it limited to the inner ring 601 being fixed, and the outer ring 602 can be rotated, which can be determined according to the actual situation. needs to be replaced. The cooling method of the outer ring 602 belongs to the prior art in the art, and will not be repeated here.

The jet device 30 includes two jet rings 301 and a plurality of jet holes 302 formed on the jet rings 301 , and the jet holes 302 are arranged radially outside the jet rings 301 . The diameter of the jet ring pipe 301 is 100 mm, and it is connected to the end of the air transport pipe 20 away from the air intake fan 10 . One end of the jet ring pipe 301 connected to the air transport pipe 20 is staggered along the circumferential direction of the jet ring pipe 301 , so that there is no interference between multiple jet rings, and it is also convenient for installation and later maintenance. The jet ring tube 301 is fixed on the inner ring 601. In other alternative embodiments, the jet ring tube 301 is not limited to be fixed on the inner ring 601, but can also be fixed on the bearing connecting part 70, which needs to ensure the stability of the jet device 30. The specific fixing method is not described in detail, and those skilled in the art can adopt a known fixing method in the prior art, such as clamp fixing. The inlet connection of the jet ring pipe 301 is not limited to the Y type, and other smooth structures can also be used, mainly to reduce the pressure loss of the cooling air 80 during transportation. Except for the inlet connection of the jet ring pipe 301, its bending and The connection and bend of the air transport duct 20 can adopt a smooth structure.

The jet ring pipe 301 is connected by four circular arc pipes, which is convenient for splicing and installation, as well as for later repair and maintenance. In order to enable the cooling air 80 to be sprayed to the inner surface of the inner ring 601 and the inner surface of the bearing connecting part 70 , especially the inner surface of the bearing connecting part 70 close to the bearing 60 , the outer diameter of the jet ring pipe 301 is smaller than the inner diameter of the inner ring 601 , the diameter of the jet ring pipe 301 is 100mm. The two jet rings 301 are coaxial with the bearing 60 , and each jet ring 301 corresponds to a different inner ring 601 to ensure that the inner surface of each inner ring 601 can be cooled evenly. The distance between two adjacent jet rings 301 in the axial direction of the jet rings 301 is 180 mm.

In other alternative embodiments, the jet loops 301 are not limited to two, nor is it limited that each jet loop 301 corresponds to a different inner ring 601 . What needs to be satisfied is that between two adjacent jet loops 301 A certain distance can achieve sufficient cooling effect of the bearing 60 and the bearing connecting member 70 . The jet ring pipe 301 is not limited to being formed by connecting four circular arc pipes, and can be formed by at least one circular arc pipe. The jet ring pipe 301 is not limited to spray the cooling air 80 to both the inner surface of the inner ring 601 and the inner surface of the bearing connecting part 70, at least it is sufficient to spray the inner surface of one of them, especially the temperature of the inner ring 601 is relatively high. A high inner surface and/or a higher temperature inner surface of the bearing connection member 70 . The distance between two adjacent jet rings 301 along the axial direction of the jet rings 301 is not limited to 180 mm, and generally 4-20 times the diameter of the jet holes 302 is used. The diameter of the jet ring tube 301 is not limited to 100 mm. In order to prevent the cooling air 80 ejected through the jet holes 302 from reaching the inner surface of the inner ring 601 and/or the inner surface of the bearing connecting part 70, the jet intensity is greatly attenuated, and the requirements must be met. The shortest distance between the jet holes 302 on the jet ring tube 301 and the inner wall of the inner ring 601 along the radial direction of the bearing 60 is no more than 200 mm and no more than 20 times the diameter of the jet holes 302 .

The jet holes 302 are arranged on the radially outer side of the jet ring pipe 301 , the diameter of the jet holes 302 is 10 mm, and the jet holes 302 are arranged at intervals along the circumferential direction of the jet ring pipe 301 . The included angle between the axial direction of the jet holes 302 and the axial direction of the inner ring 601 is 90°, and the distance between the two adjacent jet holes 302 in the circumferential direction of the inner ring 601 is 40 mm. In other alternative embodiments, the diameter of the jet hole 302 is not limited to 10 mm. In order to make the cooling air 80 pass through the jet hole 302 at a relatively high flow rate to form a jet, the diameter of the jet hole 302 should not be too large, and it needs to be smaller. value of . The included angle between the axial direction of the jet hole 302 and the axial direction of the inner ring 601 is not limited to 90°, generally 45°-90°, and 90° is the best. The distance between the two adjacent jet holes 302 in the circumferential direction of the inner ring 601 is not limited to 40 mm, and generally 2-10 times the diameter of the jet holes 302 may be used.

The air outlet fan 50 is arranged on the air outlet duct 40, and the air outlet duct 40 is used to discharge the heated air. The cooling air 80 is taken from the air inside the wind turbine or from the outside environment. The air inside the wind turbine can be directly inhaled by the air inlet fan 10 and transported to the air transport duct 20. The air inlet fan 10 is used to drive the cooling air 80 to spray to the bearing at high speed. 60 and/or the surface of the bearing connection part 70 . The air in the external environment needs to be filtered and dehumidified, and then inhaled by the air intake fan 10 to be transported to the air transport duct 20 . The cooling air 80 enters the jet ring pipe 301 through the air transport pipe 20 , and is sprayed to the inner surface of the inner ring 601 and the inner surface of the bearing connecting part 70 through the jet holes 302 on the jet ring pipe 301 to reach the bearing 60 and the bearing connecting part 70 The effect of cooling of the portion close to the bearing 60 . The heated air is guided to the air outlet duct 40 by the power of the air outlet fan 50 , and is discharged to the outside of the wind turbine through the air outlet duct 40 . In other alternative embodiments, the air outlet fan 50 may also be disposed close to the air outlet duct 40 .

In this embodiment, the cooling air 80 is transported to the jet device 30 through the air transport pipe 20, and the jet device 30 can spray the cooling air 80 to the inner surface of the inner ring 601 of the bearing 60 and the inner surface of the bearing connecting part 70 in a concentrated manner, which solves the problem of the current situation. In the prior art, the air-cooled bearing 60 has the defect of low convective heat transfer intensity, which improves the cooling efficiency of the air-cooled bearing 60 .

Example 2

The structure of this embodiment is basically the same as that of Embodiment 1, and the difference lies in that the jet device 30 is different.

As shown in FIG. 3 , the jet device 30 includes a jet channel 303 , a plurality of jet nozzles 304 and a plurality of jet holes 302 . One end of the jet channel 303 is connected to one end of the air transport duct 20 away from the air intake fan 10 , and one end of the jet channel 303 away from the air transport duct 20 is connected to the jet nozzle 304 . The jet channel 303 is formed by connecting a plurality of pipelines, which is convenient for splicing and installation, and is also convenient for later repair and maintenance. The jet nozzles 304 are arranged along the circumferential direction of the inner ring 601 , so that the inner ring 601 can be cooled uniformly. Along the axial direction of the inner ring 601 , the total axial length of the jet nozzle 304 is less than 1/2 of the total axial length of the inner ring 601 , which not only satisfies the sufficient bearing cooling effect, but also reduces the cost. The jet channel 303 is fixed on the inner ring 601. In other alternative embodiments, the jet channel 303 is not limited to be fixed on the inner ring 601, but can also be fixed on the bearing connecting member 70. It is necessary to ensure the stability of the jet device 30. The specific fixing method is not described in detail, and those skilled in the art can adopt a known fixing method in the prior art, for example, fixing with a clamp. The jet nozzles 304 are not limited to a plurality, and at least one jet nozzle 304 is used.

The jet holes 302 are arranged on the jet nozzle 304 , and the jet holes 302 are opposite to the inner surface of the inner ring 601 . The distance between the two adjacent jet holes 302 in the axial direction of the inner ring 601 may also be 2-10 times the diameter of the jet holes 302 . The cooling air 80 enters the jet channel 303 through the air transport pipe 20 , and then flows from the jet channel 303 to the jet nozzle 304 , and is sprayed to the inner ring 601 from the jet holes 302 on the jet nozzle 304 to achieve the purpose of cooling the bearing 60 . In other alternative embodiments, the jet holes 302 on the jet nozzle 304 are not limited to only spray the cooling air 80 to the inner surface of the inner ring 601 , but can also be sprayed to the inner surface of the bearing connecting part 70 , which at least meets the requirements of spraying to the inner surface of the inner ring 601 . One of the inner surfaces, in particular the higher temperature inner surface of the inner ring 601 and/or the higher temperature inner surface of the bearing connection part 70 .

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (9)

1. an air cooling device for a wind turbine bearing, used for cooling a bearing and a bearing connection part of a wind turbine, the air cooling device comprises an air inlet fan and an air outlet pipeline, characterized in that the air cooling device Also includes a jet device and an air transport duct for spraying cooling air to the surface of the bearing and/or the surface of the bearing connecting part, the jet device being fixed on the inner surface of the bearing and /or on the inner surface of the bearing connecting part, one end of the air transport duct is connected to the air intake fan, and one end of the air transport duct away from the intake fan is connected to the jet device, and the outlet The air duct and the air transport duct are independent of each other; The bearing includes an inner ring, and the fluidic device includes: At least one jet ring pipe is connected to the end of the air transport pipe away from the air inlet fan, the jet ring pipe is formed by at least one circular arc pipe, and the outer diameter of the jet ring pipe is smaller than the inner ring The inner diameter of the jet ring is coaxial with the bearing; A plurality of jet holes are arranged on the jet ring pipe and are arranged on the radially outer side of the jet ring pipe, and the plurality of jet holes are arranged at intervals along the circumferential direction of the jet ring pipe. 2 . The air cooling device for wind turbine bearings according to claim 1 , wherein the bearing is engaged with the bearing connecting part, the bearing further comprises an outer ring, and the jet device is used for cooling the bearing. 3 . Cooling air is sprayed onto the inner surface of the inner ring and the inner surface of the bearing connection part. 3 . The air cooling device for wind turbine bearings according to claim 1 , wherein when the jet device comprises at least two jet rings arranged along the axial direction of the jet ring, 3 . The distance between two adjacent jet rings in the axial direction of the jet rings is 4-20 times the diameter of the jet holes. 4 . The air cooling device for wind turbine bearings according to claim 1 , wherein when the jet device comprises at least two jet rings arranged along the axial direction of the jet ring, more The joints of the jet ring pipe and the air transport pipe are arranged staggered along the circumferential direction of the jet ring pipe. 5 . The air cooling device for wind turbine bearings according to claim 1 , wherein the included angle between the axial direction of the jet hole and the axial direction of the inner ring is 45 . 6 . °-90°, the shortest distance between the jet hole and the inner wall of the inner ring along the radial direction of the bearing is no more than 200mm and no more than 20 times the diameter of the jet hole. 6. The air cooling device for a wind turbine bearing according to any one of claims 1 to 4, wherein the two adjacent jet holes along the circumferential and axial directions of the inner ring have The hole spacing is 2-10 times the diameter of the jet holes. 7 . The air cooling device for wind turbine bearing according to claim 1 , wherein the bend and the connection between the jet device and the air transport pipe adopt a smooth-shaped structure to reduce the high-speed airflow. 8 . Pressure losses in bends and junctions of the fluidic device and the air transport duct. 8 . The air cooling device for a bearing of a wind turbine according to claim 1 , wherein the air outlet fan is arranged on the air outlet duct or the air outlet fan is arranged close to the air outlet duct. 9 . 9. A wind power generator, comprising a bearing and a bearing connecting part, wherein the bearing connecting part is the central part of the stator, characterized in that the wind power generator further comprises the wind power generator according to any one of claims 1-8 Air cooling unit for wind turbine bearings.

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