CN109185056B

CN109185056B - Variable pitch driving device, variable pitch driving system and wind generating set

Info

Publication number: CN109185056B
Application number: CN201811277603.0A
Authority: CN
Inventors: 王永刚; 王珺
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2018-10-30
Filing date: 2018-10-30
Publication date: 2020-03-17
Anticipated expiration: 2038-10-30
Also published as: CN109185056A

Abstract

The invention relates to a variable pitch driving device, a variable pitch driving system and a wind generating set, wherein the variable pitch driving device is used for driving a wind turbine to rotate by a preset angle and comprises: the sliding ring device comprises a fixed ring and a rotating ring which are coaxially arranged, an oil duct is arranged between the fixed ring and the rotating ring, and a fixed part is arranged on the outer peripheral side of the rotating ring; the variable-pitch bearing is arranged between the fixing part and the wind turbine and comprises an inner ring and an outer ring; the driving device comprises a driving rod piece, the driving rod piece is communicated with the oil duct and movably connected to the inner ring or the outer ring so as to drive the inner ring or the outer ring to drive the wind turbine to rotate in a reciprocating mode through oil pressure. The invention provides stable and strong power for the wind turbine by arranging the slip ring device with the oil channel and the driving rod piece communicated with the oil channel of the slip ring device and adopting a hydraulic driving technology to provide driving force for the driving rod piece, thereby having simple structure and easy maintenance, improving the reliability of the system and reducing the maintenance cost.

Description

Variable pitch driving device, variable pitch driving system and wind generating set

Technical Field

The invention relates to the technical field of wind power generation, in particular to a variable pitch driving device, a variable pitch driving system and a wind generating set.

Background

The wind generating set is a power generation system for converting wind energy into electric energy, wherein the size of the blade pitch angle directly influences the wind energy absorbed by the wind generating set. The pitch angle of the blades of the wind generating set needs to be continuously adjusted according to the wind speed during operation, and the wind generating set is ensured to be in an optimal operation state, wherein the pitch angle of the blades is adjusted by adopting a variable pitch driving device.

The existing variable-pitch driving device is provided with an electric variable-pitch driving device and a linear type hydraulic cylinder variable-pitch driving device. The electric variable pitch driving device comprises an electric motor, a variable pitch gear box and a storage battery, wherein an execution unit in the electric variable pitch driving device is composed of the electric motor, the variable pitch gear box and the storage battery, the cost of the execution unit is high, a generator set cannot be started for power generation at any time and can be started only after the storage battery is charged, the response speed of the system is low, the hidden danger that a wind wheel is overspeed is caused, and the generator set has potential overload risks.

The execution unit of the linear hydraulic cylinder variable pitch driving device is a linear hydraulic cylinder and a control loop thereof, and has the advantages of large transmission torque, large rigidity, accurate positioning, high dynamic response speed and the like; but because the control circuit has more components, complex control circuit and large volume, the failure rate is high and the maintenance is very inconvenient.

Disclosure of Invention

The invention aims to provide a variable pitch driving device, a variable pitch driving system and a wind generating set.

In one aspect, an embodiment of the present invention provides a pitch driving apparatus for driving a wind turbine to rotate by a predetermined angle, where the pitch driving apparatus includes: the sliding ring device comprises a fixed ring and a rotating ring which are coaxially arranged, an oil duct is arranged between the fixed ring and the rotating ring, and a fixed part is arranged on the outer peripheral side of the rotating ring; the variable-pitch bearing is arranged between the fixing part and the wind turbine and comprises an inner ring and an outer ring which are coaxially arranged; the driving device comprises a driving rod piece, the driving rod piece is communicated with the oil duct and movably connected to the inner ring or the outer ring so as to drive the inner ring or the outer ring to drive the wind turbine to rotate in a reciprocating mode through oil pressure.

According to an aspect of an embodiment of the present invention, the oil passages include a first oil passage and a second oil passage which are arranged at an interval in an axial direction of the slip ring device, the driving rod includes a first rod and a second rod which are connected to each other at a predetermined angle, one end of the first rod is movably connected to an inner ring/outer ring of the pitch bearing, the other end of the first rod is communicated with the first oil passage, one end of the second rod is pivotally connected to the first rod, and the other end of the second rod is communicated with the second oil passage, so that the first rod and the second rod work together to drive the inner ring or the outer ring to drive the wind turbine to rotate back and forth.

According to an aspect of an embodiment of the present invention, the first rod includes a first hollow rod and a first piston rod, the first hollow rod and the first piston rod are coaxially arranged, the first hollow rod is provided with a first oil pipe communicated with the first oil passage, the outer ring/the inner ring is provided with a mounting shaft extending outward in a radial direction of the outer ring/the inner ring, an end portion of the first piston rod is provided with a strip hole, and the first rod is movably connected to the inner ring or the outer ring through the matching of the strip hole and the mounting shaft.

According to an aspect of the embodiment of the present invention, the second rod includes a second hollow rod and a second piston rod, which are coaxially disposed, the second hollow rod is provided with a second oil pipe communicating with the second oil passage, and an end of the second piston rod is pivotally connected to the first hollow rod.

According to an aspect of an embodiment of the present invention, the first oil passage includes a first arc-shaped groove formed by an outer surface of the fixed ring being recessed radially inward and a second arc-shaped groove formed by an inner surface of the rotating ring being recessed radially inward, and an annular seal is provided between the first arc-shaped groove and the second arc-shaped groove to form a closed passage; the second oil duct comprises a third arc-shaped groove formed by the outer surface of the fixing ring and inwards recessed along the radial direction and a fourth arc-shaped groove formed by the inner surface of the rotating ring and inwards recessed along the radial direction, and an annular sealing piece is arranged between the third arc-shaped groove and the fourth arc-shaped groove to form a closed channel.

According to an aspect of an embodiment of the present invention, the driving apparatus further includes a hydraulic station, the first arc-shaped groove is provided with a first main oil groove communicated with the hydraulic station, and the third arc-shaped groove is provided with a second main oil groove communicated with the hydraulic station.

According to an aspect of the embodiment of the present invention, the second arc-shaped groove is provided with a first oil groove communicated with the first oil pipe, and the fourth arc-shaped groove is provided with a second oil groove communicated with the second oil pipe.

According to an aspect of an embodiment of the present invention, the first oil pipe includes a first oil inlet pipe and a first oil return pipe, and the second oil pipe includes a second oil inlet pipe and a second oil return pipe; the second arc-shaped groove is provided with a first oil inlet groove communicated with the first oil inlet pipe and a first oil return groove communicated with the first oil return pipe, and the fourth arc-shaped groove is provided with a second oil inlet groove communicated with the second oil inlet pipe and a second oil return groove communicated with the second oil return pipe.

According to one aspect of the embodiment of the invention, the number of the fixing parts is more than two, the fixing parts are uniformly distributed on the outer peripheral side of the rotating ring, each fixing part is provided with a variable pitch bearing, and each variable pitch bearing is correspondingly provided with a driving device.

In another aspect, an embodiment of the present invention further provides a pitch control driving system for a wind turbine generator system, where the pitch control driving system includes: the wind turbine is arranged on the outer peripheral side of a rotor of a generator of the wind generating set and comprises blades and a guide rod for supporting the blades along the axial direction of the wind turbine; according to any one of the pitch-variable driving devices, the slip ring device of the pitch-variable driving device is coaxially arranged with the generator, and the inner ring or the outer ring of the pitch-variable bearing of the pitch-variable driving device is connected with the guide rod so as to drive the inner ring or the outer ring to drive the wind turbine to rotate in a reciprocating manner.

In another aspect, an embodiment of the present invention further provides a wind turbine generator system, which includes the pitch drive system as described above.

According to the variable pitch driving device provided by the embodiment of the invention, the slip ring device with the oil passage and the driving rod piece communicated with the oil passage of the slip ring device are arranged, and the driving force is provided for the driving rod piece by adopting a hydraulic driving technology, so that stable and strong power can be provided for the wind turbine. In addition, the pitch-variable driving system and the wind generating set provided by the embodiment of the invention have the advantages of simple structure and easiness in maintenance, the reliability of the system is improved, and the maintenance cost is reduced.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view, partially in section, of a pitch drive arrangement according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of region A of the pitch drive apparatus shown in FIG. 1;

FIG. 3 is a schematic view of a retaining ring in the pitch drive of FIG. 1;

FIG. 4 is a partial schematic view of a rotating ring of the pitch drive arrangement of FIG. 1;

FIG. 5 is a schematic partial cross-sectional view of another pitch drive arrangement provided by an embodiment of the present invention;

FIG. 6 is an enlarged schematic view of region B of the pitch drive arrangement shown in FIG. 5;

FIG. 7 is a partial schematic view of a rotating ring in the pitch drive of FIG. 5;

FIG. 8 is a schematic structural diagram of a pitch drive system provided by an embodiment of the invention;

wherein:

1-a first tubing; 1 a-a first oil inlet pipe; 1 b-a first oil return pipe; 2-a second oil pipe; 2 a-a second oil inlet pipe; 2 b-a second oil return pipe; 3-a first oil groove; 4-a second oil groove; 3 a-a first oil inlet tank; 3 b-a first oil return groove; 4 a-a second oil inlet groove; 4 b-a second oil return groove;

10-a slip ring arrangement; 11-a fixed ring; 12-a rotating ring; 13-a first oil gallery; 13 a-a first arc-shaped slot; 13 b-a second arc-shaped slot; 14-a second oil passage; 14 a-a third arc-shaped slot; 14 b-a fourth arc-shaped slot; 15-a fixed part; 16-oil ducts;

20-a pitch bearing; 21-an inner ring of a pitch bearing; 22-an outer ring of the pitch bearing; 22 a-mounting shaft; 30-a drive device; 31-a first bar; 31 a-a first hollow rod; 31 b-a first piston rod; 31 c-elongated holes; 32-a second bar; 32 a-a second hollow rod; 32 b-a second piston rod member; 33-a hydraulic station; 331-a first main oil sump; 332-a second main sump; 40-medial axis;

100-a pitch drive; 200-a wind turbine; 210-a blade; 220-guide bar.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with reference to the orientation words as shown in the drawings, and is not intended to limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

For better understanding of the present invention, a pitch driving device, a pitch driving system and a wind generating set provided by the embodiment of the present invention are described in detail below with reference to fig. 1 to 8.

Referring to fig. 1, an embodiment of the present invention provides a pitch driving apparatus 100 for driving a wind turbine to rotate by a predetermined angle, where the pitch driving apparatus 100 includes: a slip ring arrangement 10, a pitch bearing 20 and a drive arrangement 30.

The slip ring device 10 includes a fixed ring 11 and a rotating ring 12 coaxially disposed, an oil passage 16 is disposed between the fixed ring 11 and the rotating ring 12, and a fixed portion 15 is disposed on an outer peripheral side of the rotating ring 12. The stationary ring 11 is fixedly connected to the center shaft 40 for supplying oil to the oil passage 16 of the slip ring device 10. The center shaft 40 may be designed as a hollow structure, and the hydraulic pressure station 33 may be disposed in the center shaft 40 for supplying oil to the oil passage 16 of the slip ring apparatus 10. Of course, the hydraulic station 33 may be provided at other locations.

The variable pitch bearing 20 is arranged between the fixing portion 15 and the wind turbine, the variable pitch bearing 20 comprises an inner ring 21 and an outer ring 22 which are coaxially arranged, the inner ring 21 and the fixing portion 15 are fixed or the inner ring and the fixing portion are integrally formed, the outer ring 22 is connected with the wind turbine, and a rolling piece is arranged between the inner ring 21 and the outer ring 22. As an alternative embodiment, the outer ring 22 may also be fixed to the fixing portion 15 or may be integrally formed with the fixing portion and the inner ring 21 may have a height higher than that of the outer ring 22 in the axial direction, so that the end portion of the inner ring 21 is connected to the wind turbine.

The driving device 30 includes a driving rod communicating with the oil passage 16 and movably connected to the inner ring 21 or the outer ring 22 to drive the inner ring 21 or the outer ring 22 to rotate the wind turbine 200 in a reciprocating manner by oil pressure.

According to the pitch-variable driving device 100 provided by the embodiment of the invention, the slip ring device 10 with the oil passage 16 and the driving rod piece communicated with the oil passage 16 of the slip ring device 10 are arranged, and a hydraulic driving technology is adopted to provide driving force for the driving rod piece, so that stable and strong power can be provided for the wind turbine.

The specific structure of each component of the pitch drive apparatus 100 provided by the embodiments of the present invention is described in further detail below with reference to the accompanying drawings.

For convenience of description, the embodiment of the present invention is described by taking the example that the outer ring 22 of the pitch bearing 20 is connected to the wind turbine, and the inner ring 21 is connected to the fixing portion 15.

Referring to fig. 1 and 2, the oil passages 16 include a first oil passage 13 and a second oil passage 14 spaced apart from each other in an axial direction of the slip ring device 10, and the driving rod includes a first rod 31 and a second rod 32 connected to each other at a predetermined angle, one end of the first rod 31 is movably connected to the outer ring 22, and the other end of the first rod is communicated with the first oil passage 13, one end of the second rod 32 is pivotally connected to the first rod 31, and the other end of the second rod is communicated with the second oil passage 14, such that the first rod 31 and the second rod 32 cooperate to drive the outer ring 22 to drive the wind turbine 200 to rotate in a reciprocating manner.

Since the outer ring 22 performs a reciprocating circular motion around its own axial direction, the motion locus of the end of the first pin 31 connected to the outer ring 22 is synthesized into an arc by the respective linear motions of the first pin 31 and the second pin 32 connected to each other at a predetermined angle. The predetermined angle is determined according to the size and the movement locus of the first pin 31 and the second pin 32.

When the wind turbine is driven to rotate by the outer ring 22, the wind turbine rotates by a preset pitch angle around the self axial direction, and when the wind turbine receives the propeller, the outer ring 22 drives the wind turbine to reversely rotate around the self axial direction to return to the original position. The size of the preset pitch angle can be adaptively adjusted according to the wind power.

Further, the first rod 31 includes a first hollow rod 31a and a first piston rod 31b which are coaxially disposed, the first hollow rod 31a is provided with the first oil pipe 1 communicated with the first oil passage 13, the outer ring 22 is provided with a mounting shaft 22a extending radially outward, and the mounting shaft 22a may be fixed to a mounting lug extending radially outward from the outer ring 22. The end of the first piston rod 31b is provided with a long hole 31c, and the first rod 31 is movably connected to the outer ring 22 through the long hole 31c and the fitting of the mounting shaft 22 a.

The second rod 32 includes a second hollow rod 32a and a second piston rod 32b which are coaxially disposed, the second hollow rod 32a is provided with a second oil pipe 2 communicating with the second oil passage 14, and an end of the second piston rod 32b is pivotally connected to the first hollow rod 31 a.

The purpose of the elongated hole 31c formed at the end of the first piston rod 31b is to prevent the first rod 31 and the second rod 32 from being clamped during the respective linear motion processes, and the elongated hole 31c is movably connected to the mounting shaft 22a, so that the respective linear motion trajectories of the first rod 31 and the second rod 32 are combined into an arc.

Referring to fig. 1, 3 and 4, the first oil passage 13 includes a first arc-shaped groove 13a formed by radially inwardly recessing the outer surface of the fixed ring 11 and a second arc-shaped groove 13b formed by radially inwardly recessing the inner surface of the rotating ring 12, and an annular sealing member (not shown) is disposed between the first arc-shaped groove 13a and the second arc-shaped groove 13b to form a closed passage to prevent hydraulic oil from overflowing from a junction of the first arc-shaped groove 13a and the second arc-shaped groove 13 b.

The second oil passage 14 includes a third arc-shaped groove 14a formed by radially inwardly recessing the outer surface of the fixed ring 11 and a fourth arc-shaped groove 14b formed by radially inwardly recessing the inner surface of the rotating ring 12, and an annular seal (not shown in the drawings) is provided between the third arc-shaped groove 14a and the fourth arc-shaped groove 14b to form a closed passage to prevent oil from overflowing from the junction of the third arc-shaped groove 14a and the fourth arc-shaped groove 14 b.

Optionally, the first arc-shaped groove 13a, the second arc-shaped groove 13b, the third arc-shaped groove 14a and the fourth arc-shaped groove 14b are 1/2 arcs respectively, so as to facilitate processing.

Wherein, the first arc-shaped groove 13a is provided with a first main oil groove 331 communicated with the hydraulic station 33, and the third arc-shaped groove 14a is provided with a second main oil groove 332 communicated with the hydraulic station 33. The second arc-shaped groove 13b is provided with a first oil groove 3 communicated with the first oil pipe 1, and the fourth arc-shaped groove 14b is provided with a second oil groove 4 communicated with the second oil pipe 2.

Thus, when the hydraulic station 33 receives the command for opening the propeller, the hydraulic oil is supplied from the oil tank to the first oil passage 13 through the first main oil groove 331 on the fixed ring 11, then enters the first hollow rod 31a of the first rod 31 through the first oil groove 3 and the first oil pipe 1 on the rotating ring 12, and provides the oil pressure driving force to the first piston rod 31 b; the hydraulic oil is supplied from the oil tank to the second oil passage 14 through the second main oil groove 332 on the fixed ring 11, then enters the second hollow rod 32a through the second oil groove 4 and the second oil pipe 2 on the rotating ring 12, and provides an oil pressure driving force to the second piston rod 32b to respectively drive the first rod 31 and the second rod 32 to move, so that the outer ring 22 connected with the first rod 31 drives the wind turbine to rotate around its own axial direction by a predetermined pitch angle.

When the hydraulic station 33 receives a blade retracting instruction, hydraulic oil in the first hollow rod 31a flows back to the first oil passage 13 through the first oil pipe 1 and the first oil groove 3, and then is recovered to the oil tank through the first main oil groove 331; the hydraulic oil in the second hollow rod 32a flows back into the second oil passage 14 through the second oil pipe 2 and the second oil groove 4, and is then recovered to the oil tank through the second main oil groove 332. At this time, the first piston rod 31b and the second piston rod 32b start to carry the outer ring 22 to rotate reversely, so that the outer ring 22 connected to the first rod 31 carries the wind turbine to return to the original position along the original movement track.

After the hydraulic station 33 receives the opening command or the retracting command, the hydraulic oil drives the first rod 31 or the second rod 32 to slightly delay the movement, so as to be an optional implementation manner, the first oil pipe 1 disposed on the first rod 31 may be divided into an oil inlet pipe and an oil return pipe, the second oil pipe 2 disposed on the second rod 32 may be divided into an oil inlet pipe and an oil return pipe, and the rotating ring 12 is also correspondingly provided with an oil inlet groove and an oil return groove. The oil inlet pipe and the oil return pipe are independently arranged, so that the speed and the flow of each driving rod piece can be more flexibly and accurately controlled.

Referring to fig. 5, 6 and 7, the first oil pipe 1 includes a first oil inlet pipe 1a and a first oil return pipe 1b, the second oil pipe 2 includes a second oil inlet pipe 2a and a second oil return pipe 2b, the second arc-shaped groove 13b is provided with a first oil inlet groove 3a communicated with the first oil inlet pipe 1a and a first oil return groove 3b communicated with the first oil return pipe 1b, and the fourth arc-shaped groove 14b is provided with a second oil inlet groove 4a communicated with the second oil inlet pipe 2a and a second oil return groove 4b communicated with the second oil return pipe 2 b.

Thus, when the hydraulic station 33 receives the opening command, the hydraulic oil is supplied from the oil tank to the first oil passage 13 through the first main oil groove 331 on the fixed ring 11, and then enters the first hollow rod 31a of the first rod 31 through the first oil inlet groove 3a and the first oil inlet pipe 1a on the rotating ring 12, and provides the oil pressure driving force to the first piston rod 31 b; the hydraulic oil is supplied from the oil tank to the second oil passage 14 through the second main oil groove 332 on the fixed ring 11, and then enters the second hollow rod 32a of the second rod 32 through the second oil inlet groove 4a and the second oil inlet pipe 2a on the rotating ring 12, and provides an oil pressure driving force to the second piston rod 32b to respectively drive the first rod 31 and the second rod 32 to move, so that the outer ring 22 connected to the first rod 31 rotates the wind turbine around its axial direction by a predetermined pitch angle.

When the hydraulic station 33 receives a blade retracting instruction, hydraulic oil in the first hollow rod 31a flows back to the first oil passage 13 through the first oil return pipe 1b and the first oil return groove 3b, and is then retracted into the oil tank through the first main oil groove 331; the hydraulic oil in the second hollow rod 32a flows back to the second oil passage 14 through the second oil return pipe 2b and the second oil return groove 4b, and is then recovered to the oil tank through the second main oil groove 332. At this time, the first piston rod 31b and the second piston rod 32b start to carry the outer ring 22 to rotate reversely, so that the outer ring 22 connected to the first rod 31 carries the wind turbine to return to the original position along the original movement track.

It should be noted that, when the driving force required by the wind turbine is small, the slip ring device 10 in the embodiment of the present invention may adopt a single oil passage 16, and an oil groove communicated with the driving rod is provided on the oil passage 16; when the driving force required by the wind turbine is large, the slip ring device 10 can also adopt a double-oil-channel design, namely a first oil channel 13 and a second oil channel 14, each oil channel is provided with a corresponding oil inlet groove and an oil return groove, and the oil inlet grooves and the oil return grooves are respectively connected to a corresponding first rod piece 31 and a corresponding second rod piece 32, if the second rod piece 32 fails due to fault in the working process, the first rod piece 31 can continue to drive the wind turbine to rotate, even if the wind turbine does not reach a preset angle, the wind turbine can at least continue to drive the generator to generate electricity without stopping working, and compared with a single channel and a single driving rod piece, the reliability of the variable pitch driving device is improved, and meanwhile, the power of the hydraulic station 33 is also reduced; or the slip ring device 10 may also adopt a multi-oil-passage design, and the corresponding driving rod members are a plurality of rod members, and are respectively and independently controlled, so as to improve the reliability and safety of the system.

In addition, the number of the fixing portions 15 of the slip ring device 10 in the embodiment of the present invention may be more than two, for example, three, the two or more fixing portions 15 are uniformly distributed on the outer peripheral side of the rotating ring 12, each fixing portion 15 is provided with a pitch bearing 20, each pitch bearing 20 is correspondingly provided with a driving device 30 to drive a corresponding wind turbine to rotate by a predetermined angle, and the two or more driving devices 30 drive the two or more wind turbines to rotate, so as to increase the wind energy accumulation capacity and improve the power generation power and the power generation efficiency.

Although the outer ring 22 of the pitch bearing 20 of the pitch drive apparatus 100 is connected to the wind turbine and the inner ring 21 is fixed to the fixing portion 15 for convenience of description, it should be understood that the pitch drive apparatus 100 according to the exemplary embodiment of the present invention is also applicable to the structure in which the inner ring 21 of the pitch bearing 20 is connected to the wind turbine and the outer ring 22 is fixed to the fixing portion 15, and the description thereof is omitted.

Therefore, the variable pitch driving device 100 provided by the embodiment of the invention adopts the hydraulic driving technology to provide stable and strong power for the wind turbine, and compared with the straight-cylinder hydraulic cylinder in the prior art, the variable pitch driving device is simple in structure and easy to maintain, improves the reliability of the system, and reduces the maintenance cost.

Referring to fig. 8, an embodiment of the present invention further provides a pitch driving system for a wind turbine generator system, where the pitch driving system includes: the pitch drive 100 and the wind turbine 200 as previously described.

The wind turbine 200 is provided on the outer peripheral side of a rotor of a generator M of a wind turbine generator system, and the wind turbine 200 includes a blade 210 and a guide rod 220 that supports the blade 210 in the axial direction thereof.

The slip ring device 10 of the variable pitch driving device 100 is coaxially arranged with the generator M, and the inner ring 21 or the outer ring 22 of the variable pitch bearing 20 of the variable pitch driving device 100 is connected with the guide rod 220 to drive the inner ring 21 or the outer ring 22 to drive the wind turbine 200 to rotate in a reciprocating manner.

In addition, the embodiment of the invention also provides a wind generating set, which comprises the variable pitch driving system.

The wind generating set provided by the embodiment of the invention controls the wind wheel to absorb the wind energy by controlling the pitch angle of the wind turbine 200, has the characteristics of stable output power, small torque oscillation and small cabin oscillation, can effectively reduce noise, and improves the stress condition of the wind turbine 200 and the whole machine, thereby ensuring the safe and reliable operation of the generating set and prolonging the service life of the whole equipment. For example, when strong wind power such as typhoon exists, the wind turbine 200 is controlled to be in a position parallel to the wind direction, and at the moment, the variable pitch of the wind turbine 200 plays a role of pneumatic braking, so that the wind turbine 200 does not rotate any more, and the generator set stops running; when the wind power is small, the wind turbine 200 is controlled to increase the stressed area so as to absorb the wind energy as much as possible.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A pitch drive (100) for driving a wind turbine to rotate through a predetermined angle, the pitch drive (100) comprising:

the sliding ring device (10) comprises a fixing ring (11) and a rotating ring (12) which are coaxially arranged, an oil duct (16) is arranged between the fixing ring (11) and the rotating ring (12), the oil duct (16) comprises a first oil duct (13) and a second oil duct (14) which are arranged at intervals along the axial direction of the sliding ring device (10), and a fixing part (15) is arranged on the outer peripheral side of the rotating ring (12);

the variable-pitch bearing (20) is arranged between the fixing part (15) and the wind turbine, and the variable-pitch bearing (20) comprises an inner ring (21) and an outer ring (22) which are coaxially arranged;

drive arrangement (30), including the drive rod piece, the drive rod piece is including being first member (31) and second member (32) of predetermined angle interconnect, the one end movably of first member (31) is connected to inner circle (21) or outer lane (22), the other end with first oil duct (13) intercommunication, the one end of second member (32) with first member (31) pivot connection, the other end with second oil duct (14) intercommunication make first member (31) with second member (32) are through the oil pressure common effect in order to drive inner circle (21) or outer lane (22) drive wind turbine (200) reciprocating rotation.

2. The pitch drive device (100) according to claim 1, wherein the first rod (31) comprises a first hollow rod (31a) and a first piston rod (31b) which are coaxially arranged, a first oil pipe (1) which is communicated with the first oil passage (13) is arranged on the first hollow rod (31a), a mounting shaft (22a) which extends outwards along the radial direction of the inner ring (21) or the outer ring (22) is arranged on the inner ring (21) or the outer ring (22), an end of the first piston rod (31b) is provided with a long-strip-shaped hole (31c), and the first rod (31) is movably connected to the inner ring (21) or the outer ring (22) through the matching of the long-strip-shaped hole (31c) and the mounting shaft (22 a).

3. The pitch drive (100) according to claim 2, wherein the second rod (32) comprises a second hollow rod (32a) and a second piston rod (32b) which are coaxially arranged, the second hollow rod (32a) is provided with a second oil pipe (2) which is communicated with the second oil channel (14), and the end of the second piston rod (32b) is pivotally connected with the first hollow rod (31 a).

4. The pitch drive (100) according to claim 3, wherein the first oil channel (13) comprises a first arc-shaped groove (13a) formed by the outer surface of the fixed ring (11) being radially inwardly recessed and a second arc-shaped groove (13b) formed by the inner surface of the rotating ring (12) being radially inwardly recessed, and wherein an annular seal is arranged between the first arc-shaped groove (13a) and the second arc-shaped groove (13b) to form a closed channel;

the second oil channel (14) comprises a third arc-shaped groove (14a) formed by the outer surface of the fixed ring (11) and inwards recessed along the radial direction and a fourth arc-shaped groove (14b) formed by the inner surface of the rotating ring (12) and inwards recessed along the radial direction, and an annular sealing piece is arranged between the third arc-shaped groove (14a) and the fourth arc-shaped groove (14b) to form a closed channel.

5. Pitch drive (100) according to claim 4, characterized in that the drive (30) further comprises a hydraulic station (33), a first main oil groove (331) communicating with the hydraulic station (33) being provided on the first arc-shaped groove (13a), a second main oil groove (332) communicating with the hydraulic station (33) being provided on the third arc-shaped groove (14 a).

6. The pitch drive (100) according to claim 4, wherein the second arc-shaped groove (13b) is provided with a first oil groove (3) communicating with the first oil pipe (1), and the fourth arc-shaped groove (14b) is provided with a second oil groove (4) communicating with the second oil pipe (2).

7. The pitch drive (100) according to claim 4, wherein the first oil pipe (1) comprises a first oil inlet pipe (1a) and a first oil return pipe (1b), and the second oil pipe (2) comprises a second oil inlet pipe (2a) and a second oil return pipe (2 b);

the oil return device is characterized in that a first oil inlet groove (3a) communicated with the first oil inlet pipe (1a) and a first oil return groove (3b) communicated with the first oil return pipe (1b) are formed in the second arc-shaped groove (13b), and a second oil inlet groove (4a) communicated with the second oil inlet pipe (2a) and a second oil return groove (4b) communicated with the second oil return pipe (2b) are formed in the fourth arc-shaped groove (14 b).

8. The pitch drive device (100) according to any one of claims 1 to 7, wherein the number of the fixing portions (15) is two or more, the two or more fixing portions (15) are uniformly distributed on the outer circumferential side of the rotating ring (12), each fixing portion (15) is provided with the pitch bearing (20), and each pitch bearing (20) is correspondingly provided with the drive device (30).

9. A pitch drive system for a wind turbine generator system, the pitch drive system comprising:

the wind turbine (200) is arranged on the outer peripheral side of a rotor of a generator (M) of the wind generating set, and the wind turbine (200) comprises a blade (210) and a guide rod (220) which supports the blade (210) along the axial direction of the wind turbine;

a pitch drive arrangement (100) according to any of claims 1 to 8, wherein a slip ring arrangement (10) of the pitch drive arrangement (100) is arranged coaxially with the generator (M), and an inner ring (21) or an outer ring (22) of a pitch bearing (20) of the pitch drive arrangement (100) is connected with the guide rod (220) for driving the inner ring (21) or the outer ring (22) to rotate the wind turbine (200) in a reciprocating manner.

10. A wind park according to claim 9, comprising a pitch drive system according to claim 9.