CN111140432A

CN111140432A - Wind turbine generator system variable pitch system and wind turbine generator system

Info

Publication number: CN111140432A
Application number: CN201811307834.1A
Authority: CN
Inventors: 谭术平; 仵文松; 韩佳; 肖长远; 曾昌勇
Original assignee: CSIC Haizhuang Windpower Co Ltd
Current assignee: CSIC Haizhuang Windpower Co Ltd
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2020-05-12
Anticipated expiration: 2038-11-05
Also published as: CN111140432B

Abstract

The invention discloses a wind turbine generator system and a pitch system thereof, wherein the wind turbine generator system comprises a hub, a pitch bearing and a pitch drive, the pitch bearing comprises an outer ring and an inner ring, the outer ring is connected with the hub, the inner ring is used for being connected with blades, and a pitch bearing gear is arranged on the pitch bearing, wherein: the variable-pitch drive is arranged in a selected area and meshed with the variable-pitch bearing gear through the variable-pitch drive gear, and the selected area is an area where the radial deformation of the outer ring and the inner ring is smaller than a preset value. According to the technical scheme, the variable pitch drive is installed in the area where the radial deformation of the outer ring and the inner ring of the variable pitch bearing is smaller than the preset value, and when the variable pitch bearing runs, the variable pitch drive is installed in the area where the radial deformation of the outer ring and the inner ring is smaller, so that the opening formed when the variable pitch drive gear is meshed with the variable pitch bearing gear can be reduced as much as possible, and therefore the abrasion between the variable pitch drive gear and the variable pitch bearing gear can be reduced.

Description

Wind turbine generator system variable pitch system and wind turbine generator system

Technical Field

The invention relates to the technical field of wind turbines, in particular to a variable pitch system of a wind turbine and the wind turbine.

Background

With the gradual reduction of traditional energy and the gradual protrusion of environmental problems, wind energy with characteristics of reproducibility, cleanness and the like is widely applied. The utilization of wind turbine generators to convert wind energy into electric energy is one of the main ways of wind energy utilization. The wind turbine mainly comprises a main transmission system, a variable pitch system and a yaw system, and the wind turbine can complete the conversion work of wind energy through the mutual matching of the systems.

In the existing wind turbine generator pitch system, the pitch drive is mostly arranged in an area with less fatigue damage to the hub or an area easy to install, but deformation of the inner ring and the outer ring along the radial direction when the pitch bearing operates is not fully considered, so that an opening may occur when the pitch drive gear is meshed with the pitch bearing gear at the position where the pitch bearing is arranged in the process of operation of the pitch bearing, namely, a gap between the pitch drive gear and the pitch bearing gear is increased, and abrasion between the pitch drive gear and the pitch bearing gear is aggravated.

In summary, how to reduce the openings when the pitch drive gear and the pitch bearing gear are meshed as much as possible so as to reduce the wear between the pitch drive gear and the pitch bearing gear is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of this, the present invention provides a pitch system of a wind turbine and a wind turbine, so as to reduce as much as possible openings that occur when a pitch drive gear is meshed with a pitch bearing gear, thereby reducing wear between the pitch drive gear and the pitch bearing gear.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides a wind turbine generator system becomes oar system, includes wheel hub, becomes oar bearing, becomes the oar drive, it includes outer lasso, inner race to become the oar bearing, outer lasso with wheel hub coupling, inner race is used for linking with the blade, it is provided with becomes oar bearing gear on the oar bearing to become, wherein:

the variable-pitch drive is arranged in a selected area and meshed with the variable-pitch bearing gear through the variable-pitch drive gear, and the selected area is an area where the radial deformation of the outer ring and the inner ring is smaller than a preset value.

Preferably, the included angle between the mounting line of the variable pitch drive and the datum line ranges from 46 degrees to 72 degrees, or ranges from 239 degrees to 263 degrees, including end point values;

the mounting line is a connecting line between a center point of the variable pitch drive mounting position and a center point of the variable pitch bearing mounting position, and an included angle of 5 degrees is formed between the horizontal line and the reference line along the counterclockwise direction.

Preferably, the variable pitch drive is installed in an area where the radial deformation of the outer ring and the inner ring is equal to 0.

Preferably, the pitch bearing gear is arranged on the inner race of the pitch bearing.

Preferably, the pitch bearing further comprises a lightning protection device mounted on the pitch bearing.

Preferably, the seal ring included in the pitch bearing is specifically a double-lip seal ring.

A wind turbine comprising a wind turbine pitch system according to any preceding claim.

The invention provides a wind turbine generator system and a pitch system thereof, wherein the wind turbine generator system comprises a hub, a pitch bearing and a pitch drive, the pitch bearing comprises an outer ring and an inner ring, the outer ring is connected with the hub, the inner ring is used for being connected with blades, and a pitch bearing gear is arranged on the pitch bearing, wherein: the variable-pitch drive is arranged in a selected area and meshed with the variable-pitch bearing gear through the variable-pitch drive gear, and the selected area is an area where the radial deformation of the outer ring and the inner ring is smaller than a preset value.

According to the technical scheme, the variable pitch drive is installed in the area where the radial deformation of the outer ring and the inner ring of the variable pitch bearing is smaller than the preset value, and when the variable pitch bearing runs, the variable pitch drive is installed in the area where the radial deformation of the outer ring and the inner ring is smaller, so that the opening formed when the variable pitch drive gear is meshed with the variable pitch bearing gear can be reduced as much as possible, and therefore the abrasion between the variable pitch drive gear and the variable pitch bearing gear can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pitch system of a wind turbine generator according to an embodiment of the present invention;

fig. 2 is a data diagram of radial deformation of an outer ring and an inner ring of a pitch bearing according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Please refer to fig. 1, which shows a schematic structural diagram of a pitch system of a wind turbine generator system according to an embodiment of the present invention, including a hub 1, a pitch bearing 2, and a pitch drive, where the pitch bearing 2 includes an outer race 21 and an inner race 22, the outer race 21 is coupled to the hub 1, the inner race 22 is used for coupling to a blade, and a pitch bearing gear is disposed on the pitch bearing 2, where:

the variable pitch drive is arranged in a selected area and meshed with the variable pitch bearing gear through the variable pitch drive gear, and the selected area is an area where the radial deformation of the outer ring 21 and the inner ring 22 is smaller than a preset value.

The wind turbine generator system variable pitch system can comprise a hub 1, a variable pitch bearing 2 and a variable pitch drive. Wherein, the hub 1 is used for connecting the blades and the main shaft, bearing the load from the blades and transmitting the load to the main shaft; the variable pitch bearing 2 is arranged between the blade and the hub 1 and comprises an outer ring 21 and an inner ring 22, the outer ring 21 is connected with the hub 1 through bolts and the like, and the inner ring 22 is used for being connected with the blade through bolts and the like; the variable pitch drive is used for driving the variable pitch bearing 2 to rotate when the wind direction changes so as to change the windward angle of the blade, so that the blade is kept in the optimal windward state, the lift force of the blade is controlled, and the torque and the power on the blade are controlled.

When the pitch drive is installed, the radial deformation data of the outer ring 21 and the inner ring 22 of the pitch bearing 2 is obtained in advance through calculation and analysis, and specifically as shown in fig. 2, a radial deformation data diagram of the outer ring and the inner ring of the pitch bearing provided by the embodiment of the present invention is shown, where the radial deformation unit is mm. The angle value marked in fig. 2 corresponds to the angle value in fig. 1, and based on the direction of the hub 1 shown in fig. 1, the rear end of the hub 1 is 0 °, the front end of the hub 1 is 180 °, at this time, the gravity direction of the blade coincides with the 265 ° direction in fig. 1, the horizontal line direction coincides with the 355 ° direction in fig. 1, that is, the 0 ° direction marked in fig. 1 forms an angle of 5 ° with the horizontal line, and the line of the marked 0 ° direction is located above the horizontal line, that is, the horizontal line direction rotates 5 ° counterclockwise as the 0 ° direction marked in fig. 2 and as the 0 ° direction marked in fig. 1.

As can be seen from fig. 2, the radial deformation tendency of the outer race 21 is approximately the same as that of the inner race 22, and the maximum radial deformation of both the outer race 21 and the inner race 22 is approximately 1.5 mm. After the radial deformation data shown in fig. 2 is obtained, a value with a smaller radial deformation is selected as a preset value in advance, for example, any value (including an endpoint value) between 0 mm and 0.05mm is selected as the preset value. After the preset value is selected, the angle ranges corresponding to the radial deformation of the outer and

inner rings

21 and 22 smaller than the preset value are determined, and the angle ranges are mapped to the structure shown in fig. 1, so as to obtain the selected area in fig. 1. The pitch drive is then mounted at any position in the selected region and the mounted pitch drive is meshed with the pitch bearing gear via the pitch drive gear.

Because the mounting position of the variable pitch drive is the region with relatively small radial deformation of the outer ring 21 and the inner ring 22, when the variable pitch bearing 2 runs, the opening formed when the variable pitch drive gear is meshed with the variable pitch bearing gear can be obviously reduced, namely, the gap between the variable pitch drive gear and the variable pitch bearing gear can be obviously reduced, so that the abrasion between the variable pitch drive gear and the variable pitch bearing gear can be obviously reduced, and the service life of the variable pitch drive and the variable pitch bearing can be further prolonged.

According to the pitch system of the wind turbine generator, provided by the embodiment of the invention, the included angle range between the mounting line of the pitch drive and the datum line can be 46-72 degrees, or 239-263 degrees, including endpoint values;

the mounting line is a connecting line between the center point of the variable pitch drive mounting position and the center point of the variable pitch bearing 2 mounting position, and the horizontal line and the reference line form an included angle of 5 degrees along the anticlockwise direction.

When the radial deformation of the outer ring 21 and the inner ring 22 is equal to 0, the corresponding angle values are respectively 46 °, 72 °, 239 ° and 263 °, and then, areas corresponding to 46 ° to 72 °, and 239 ° to 263 ° are determined in fig. 1, and the radial deformation of the outer ring 21 and the inner ring 22 of the pitch bearing 2 is relatively small in the areas.

And mounting a variable pitch drive at any position in the determined area, wherein the variable pitch drive is meshed with the variable pitch bearing gear through the variable pitch drive gear. At this time, the included angle between the mounting line of the pitch drive and the reference line is between 46 ° and 72 °, or between 239 ° and 263 °, and includes end point values (46 °, 72 °, 239 °, 263 °), that is, the value of the angle a marked in fig. 1 is between 46 ° and 72 °, or between 239 ° and 263 °, and includes end point values. That is, the included angle between the installation line of the pitch drive and the reference line may be any value within the above-mentioned included angle range. The mounting line mentioned here is a connecting line between the center point of the mounting position of the pitch drive and the center point of the mounting position of the pitch bearing 2, the reference line is a line marked in the direction of 0 ° in fig. 2, and the horizontal line and the reference line form an angle of 5 ° in the counterclockwise direction.

Because the radial deformation of the outer ring 21 and the inner ring 22 of the variable pitch bearing 2 in the included angle range is relatively small, the openings formed when the variable pitch drive gear is meshed with the variable pitch bearing gear can be reduced when the variable pitch bearing 2 runs, and therefore the abrasion of the variable pitch drive gear and the variable pitch bearing gear is reduced.

According to the pitch control system of the wind turbine generator, the pitch control drive can be installed in the area where the radial deformation of the outer ring 21 and the inner ring 22 is equal to 0.

According to fig. 2, the corresponding angle values (i.e. 46 °, 72 °, 239 °, 263 °) when the radial deformation of the outer and

inner races

21, 22 is equal to 0 are determined, and the determined angle values are mapped to the structure of fig. 1 to determine the selected area. The pitch drive is then mounted on the selected area, i.e. directly on an angle value a equal to any of 46 °, 72 °, 239 °, 263 °.

When the pitch bearing 2 is operated, because the radial deformation of the outer ring 21 and the inner ring 22 at the mounting position of the pitch drive is approximately equal to 0, the opening which is formed when the pitch drive gear is meshed with the pitch bearing gear can be almost completely avoided, and therefore the abrasion between the pitch drive gear and the pitch bearing gear can be obviously reduced.

According to the pitch system of the wind turbine generator, the pitch bearing gear can be arranged on the inner ring 22 of the pitch bearing 2.

The pitch bearing gear may be machined on the inner ring 22 of the pitch bearing 2 so that the pitch bearing 2 forms an internal toothed structure such that an internal mesh is formed between the pitch drive gear and the pitch bearing gear.

The wind turbine generator pitch system provided by the embodiment of the invention further comprises a lightning protection device arranged on the pitch bearing 2.

The wind turbine generator system pitch system can further comprise lightning protection devices installed on the pitch bearing 2, the lightning protection devices can be distributed on the pitch bearing 2 in an equal division mode, the lightning protection devices can comprise a gasket pressing plate, a carbon fiber brush and a current collecting claw, wherein the carbon fiber brush is used for compensating static unbalance, and the pitch bearing 2 is protected from being damaged.

The lightning protection device can effectively conduct current acting on the hub 1 and the blades to the ground through the current collecting claws so as to avoid damage to a circuit of the wind turbine generator caused by lightning stroke.

According to the pitch control system of the wind turbine generator, the sealing ring included in the pitch control bearing 2 can be a double-lip sealing ring.

The sealing ring arranged inside the variable pitch bearing 2 and used for sealing can be specifically a double-lip sealing ring, the sealing lip outside the sealing ring is used for preventing dust outside from entering the variable pitch bearing 2, and the sealing lip inside the sealing ring is used for preventing lubricating grease inside the variable pitch bearing 2 from leaking so as to keep the working pressure in the cavity.

Wherein, the material of the double-lip sealing ring can be oil-proof nitrile rubber.

The embodiment of the invention also provides a wind turbine generator, which comprises any one of the wind turbine generator variable pitch systems.

The variable-pitch system of any wind turbine generator is applied to the wind turbine generator, so that the openings formed when the variable-pitch driving gear and the variable-pitch bearing gear are meshed are reduced as much as possible, the abrasion between the variable-pitch driving gear and the variable-pitch bearing gear is reduced, the service lives of the variable-pitch driving gear and the variable-pitch bearing are prolonged, the fault rate and the maintenance rate of the wind turbine generator are reduced, and the service life of the wind turbine generator is prolonged.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present invention that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a wind turbine generator system becomes oar system, its characterized in that includes wheel hub, becomes oar bearing, becomes the oar drive, it includes outer lasso, inner race to become the oar bearing, outer lasso with wheel hub couples, inner race is used for linking with the blade, it becomes oar bearing gear to be provided with on the oar bearing, wherein:

2. The wind turbine generator pitch system according to claim 1, wherein an included angle between the mounting line of the pitch drive and the reference line ranges from 46 ° to 72 °, or from 239 ° to 263 °, inclusive;

3. The wind turbine generator pitch system according to claim 2, wherein the pitch drive is mounted in a region where the radial deformation of the outer and inner rings is equal to 0.

4. The wind turbine generator pitch system of claim 1, wherein the pitch bearing gear is disposed on the inner race of the pitch bearing.

5. The wind turbine generator pitch system of claim 1, further comprising a lightning protection device mounted on the pitch bearing.

6. The wind turbine generator pitch system according to claim 1, wherein the seal ring included in the pitch bearing is specifically a double-lip seal ring.

7. Wind turbine comprising a wind turbine pitch system according to any of claims 1 to 6.