Variable pitch mechanism and wind generating set

Abstract

The utility model discloses a variable-pitch mechanism and a wind generating set, the variable-pitch mechanism comprises a variable-pitch bearing, and the variable-pitch bearing comprises a variable-pitch inner ring and a variable-pitch outer ring; the mounting seat is connected to one of the variable pitch inner ring and the variable pitch outer ring; the driving assembly comprises at least one driving piece, each driving piece comprises a driving body and a driving end, and the driving end of each driving piece is connected with the other one of the variable pitch inner ring and the variable pitch outer ring; the supporting assembly and the driving assembly are rotationally installed on the installation base through the supporting assembly, the supporting assembly comprises a fixing piece and a rotary bearing, the rotary bearing comprises a rotary inner ring and a rotary outer ring, one of the rotary inner ring and the rotary outer ring is connected to the installation base, the installation base is connected to one side, in the axial direction, of the rotary bearing, and the other one of the rotary inner ring and the rotary outer ring is connected with the fixing piece. The fixing piece is connected to the other side of the slewing bearing in the axial direction, and a driving body of the driving piece is connected to the fixing piece. The variable pitch mechanism and the wind generating set are simple in overall structure, light in weight and convenient to install and maintain.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power generation, and particularly relates to a variable-pitch mechanism and a wind turbine generator set. BACKGROUND

[0002] In a wind turbine generator set, in order to adapt the tilting direction of a blade to different wind directions, a variable-pitch mechanism is usually used to adjust the direction of the blade, so as to change the angle of attack of the blade to the wind direction and ensure that the blade can maintain the best windward state.

[0003] At present, a variable-pitch mechanism formed by combining a variable-pitch bearing and a bearing driving part is usually used. When the bearing driving part drives the variable-pitch bearing, it will be subjected to a large counterforce, and therefore a support structure is usually used to support the bearing driving part for protection. However, the existing support structure is relatively complex and has a large overall weight, which is not conducive to installation and maintenance. CONTENT OF THE UTILITY MODEL

[0004] The application provides a variable-pitch mechanism and a wind turbine generator set. The overall structure of the variable-pitch mechanism is simple, and the weight is relatively light, so that overall installation and subsequent maintenance operations are facilitated.

[0005] The application provides a variable-pitch mechanism, which comprises a variable-pitch bearing, a mounting seat, a driving assembly and a support assembly. The variable-pitch bearing comprises a variable-pitch inner ring and a variable-pitch outer ring. The mounting seat is connected to one of the variable-pitch inner ring and the variable-pitch outer ring. The driving assembly comprises at least one driving piece. The driving piece comprises a driving body and a driving end. The driving end of each driving piece is connected to the other of the variable-pitch inner ring and the variable-pitch outer ring. The support assembly is used to rotatably mount the driving assembly to the mounting seat. The support assembly comprises a fixing piece and a rotary bearing. The rotary bearing comprises a rotary inner ring and a rotary outer ring. One of the rotary inner ring and the rotary outer ring is connected to the mounting seat, and the mounting seat is connected to one side of the rotary bearing in the axial direction. The other is connected to the fixing piece, and the fixing piece is connected to the other side of the rotary bearing in the axial direction. The driving body of the driving piece is connected to the fixing piece.

[0006] The variable-pitch mechanism as above, wherein the fixing piece comprises a connecting structure and a fixing structure. The fixing structure is movably mounted to the connecting structure. The driving body is detachably connected to the fixing structure. The fixing piece is connected to the rotary outer ring through the connecting structure.

[0007] The variable-pitch mechanism as above, wherein the connecting structure comprises a first connecting part and two groups of second connecting parts connected to each other. The first connecting part is connected to the rotary outer ring. The two groups of second connecting parts are oppositely arranged along the radial direction of the driving body. The opposite ends of the fixing structure are movably connected to the two groups of second connecting parts in one-to-one correspondence.

[0008] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the fixed structure comprises a ring-shaped main body and a support shaft protruding from the ring-shaped main body at opposite sides in a radial direction, and each support shaft is movably connected to the corresponding second connecting part through a bearing.

[0009] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the first connecting part is connected to the top of the outer ring, the first connecting part is in a partially circular plate shape, a part of the outer edge of the first connecting part is in an arc shape, the center of the arc of the arc-shaped outer edge of the first connecting part coincides with the center of the circle of the outer ring, and the radius of the arc-shaped outer edge of the first connecting part is less than or equal to the radius of the outer ring.

[0010] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the first connecting part has a connecting hole for passing through a connecting piece, the outer ring is fixedly connected to the first connecting part through the connecting piece; and / or the surface of the inner ring facing the mounting base has a positioning structure, the mounting base has a positioning interface, the positioning structure is opposite to the positioning interface in position and can be fixedly connected.

[0011] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the mounting base has a mounting through hole, the mounting through hole is located below the rotary bearing, and the mounting through hole is opposite to the inner ring in position and is connected in communication, the mounting through hole is used for injecting lubricating medium into the inner ring.

[0012] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the rotary bearing is a double-row four-point angular contact bearing.

[0013] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the driving assembly further comprises a driving support and a linkage, the linkages are connected through the driving support, and each linkage is fixedly connected to the inner ring, and the driving end of each driving part is movably connected to the corresponding linkage.

[0014] The variable pitch mechanism as claimed in any one of the preceding claims, wherein the linkage comprises a linkage base and a transmission rod, the linkage base is fixedly connected to the inner ring, the transmission rod is sequentially passed through the linkage base and the driving end in a direction perpendicular to the mounting base, and at least one of the linkage base and the driving end is rotatably connected to the transmission rod.

[0015] In another aspect, the application also provides a wind turbine generator, which comprises the variable pitch mechanism.

[0016] The variable pitch mechanism comprises a variable pitch bearing, a mounting base, a driving assembly and a support assembly, the mounting base is connected to one of the inner ring and the outer ring, the driving assembly is installed on the mounting base through the support assembly, the driving end of the driving part of the driving assembly is connected to the other one of the inner ring and the outer ring, and the other one of the inner ring and the outer ring is used for connecting the wind power blade, under the driving of the driving end, the relative rotation between the inner ring and the outer ring can be driven, so that the relative rotation between the wind power blade and the mounting base is realized, and the adjustment of the direction of the blade is realized.

[0017] The support assembly comprises a fixing member and a slewing bearing, the driving body of the driving member is detachably connected to the fixing member and connected to the slewing bearing through the fixing member, the slewing bearing comprises a slewing inner ring and a slewing outer ring, the fixing member is fixed to one of the slewing inner ring and the slewing outer ring, the other one is fixed to the mounting seat, and the fixing member and the mounting seat are respectively fixed to two sides of the slewing bearing in the axial direction, and no interference occurs when the two sides rotate relative to each other, the driving member is subjected to a reaction force when driving the variable-pitch bearing to rotate, and the driving body can also be slightly rotated between the slewing bearing and the mounting seat, wherein the slewing bearing can simultaneously transmit the axial force and the radial force of the driving member, and the load condition of the driving member is improved, so that the support assembly can realize the support and load condition improvement of the driving assembly only through the fixing member and the slewing bearing, the overall structure is simple, the weight is light, and the installation and maintenance are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0019] Figure 1 It is a top view of the variable-pitch mechanism of the embodiments of the present application.

[0020] Figure 2 It is a sectional view of the driving member of the variable-pitch mechanism of the embodiments of the present application.

[0021] Figure 3 It is a structural schematic view of the support assembly of the variable-pitch mechanism of the embodiments of the present application.

[0022] Figure 4 It is another angle sectional view of the support assembly of the variable-pitch mechanism of the embodiments of the present application.

[0023] Explanation of reference numerals:

[0024] 10, variable-pitch bearing; 11, variable-pitch inner ring; 12, variable-pitch outer ring;

[0025] 20, mounting seat; 21, mounting through hole;

[0026] 30, driving assembly; 31, driving member; 311, driving body; 312, driving end; 32, driving support member; 33, linkage member; 331, linkage seat; 332, transmission rod;

[0027] 40, support assembly; 41, fixing member; 411, connecting structure; 412, fixing structure; 413, first connecting part; 414, second connecting part; 415, annular body; 416, support shaft; 42, slewing bearing; 421, slewing inner ring; 422, slewing outer ring; 43, connecting member. DETAILED DESCRIPTION

[0028] The features and exemplary embodiments of various aspects of the present application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to explain the principles of the present application, and are not intended to limit the present application. The present application can be implemented without some of the specific details described below. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0029] As shown in Figures 1 to 4 The present application provides a variable pitch mechanism, which comprises a variable pitch bearing 10, a mounting seat 20, a driving assembly 30, and a support assembly 40. The variable pitch bearing 10 comprises a variable pitch inner ring 11 and a variable pitch outer ring 12. The mounting seat 20 is connected to one of the variable pitch inner ring 11 and the variable pitch outer ring 12. The driving assembly 30 comprises at least one driving member 31. The driving member 31 comprises a driving body 311 and a driving end 312. The driving end 312 of each driving member 31 is connected to the other one of the variable pitch inner ring 11 and the variable pitch outer ring 12. The driving assembly 30 is rotatably mounted on the mounting seat 20 through the support assembly 40. The support assembly 40 comprises a fixing member 41 and a slewing bearing 42. The slewing bearing 42 comprises a slewing inner ring 421 and a slewing outer ring 422. One of the slewing inner ring 421 and the slewing outer ring 422 is connected to the mounting seat 20, and the mounting seat 20 is connected to one side of the slewing bearing 42 in the axial direction. The other one of the slewing inner ring 421 and the slewing outer ring 422 is connected to the fixing member 41, and the fixing member 41 is connected to the other side of the slewing bearing 42 in the axial direction. The driving body 311 of the driving member 31 is connected to the fixing member 41.

[0030] In the specific implementation, the variable pitch mechanism of the present application comprises the variable pitch bearing 10, the mounting seat 20, the driving assembly 30, and the support assembly 40. The mounting seat 20 is connected to one of the variable pitch inner ring 11 and the variable pitch outer ring 12. The driving assembly 30 is mounted on the mounting seat 20 through the support assembly 40. The driving end 312 of the driving member 31 of the driving assembly 30 is connected to the other one of the variable pitch inner ring 11 and the variable pitch outer ring 12. The other one of the variable pitch inner ring 11 and the variable pitch outer ring 12 is used to connect a wind turbine blade. Under the driving of the driving end 312, the relative rotation between the variable pitch inner ring 11 and the variable pitch outer ring 12 can be driven, so that the relative rotation between the wind turbine blade and the mounting seat 20 occurs, and the adjustment of the direction of the blade is realized.

[0031] The support assembly 40 includes a fixing member 41 and a slewing bearing 42. The drive body 311 of the drive member 31 is detachably connected to the fixing member 41. The slewing bearing 42 includes an inner slewing ring 421 and an outer slewing ring 422. The fixing member 41 is fixed to one of the inner slewing ring and the outer slewing ring. The drive body 311 of the drive member 31 can be connected to one of the inner slewing ring and the outer slewing ring through the fixing member 41. The fixing member 41 and the drive body 311 are connected together to one side of the slewing bearing 42 in the axial direction. The mounting seat 20 is connected to the other of the inner slewing ring and the outer slewing ring, and the connection position is on the other side of the slewing bearing 42 in the axial direction. This installation fit allows the drive body 311 to rotate relative to the mounting seat 20. When the two rotate relative to each other, they are located on opposite sides of the slewing bearing 42 in the axial direction, and there is no interference in movement.

[0032] When the drive component 31 drives the pitch bearing 10 to rotate, the drive end 312 of the drive component 31 extends from the drive body 311 and pushes the pitch inner ring 11 or the pitch outer ring 12 connected to it to rotate. It is subjected to a reaction force from the pitch inner ring 11 or the pitch outer ring 12. When the drive body 311 is subjected to the reaction force, it can rotate slightly between the slewing bearing 42 and the mounting base 20. The slewing bearing 42 can transmit the axial force and radial force on the drive body 311 at the same time, improving the load condition of the drive component 31. Therefore, the support component 40 can achieve the support and improvement of the load condition of the drive component 30 by only the fixing component 41 and the slewing bearing 42. The overall structure is simple, the weight is light, and it is easy to install and maintain.

[0033] Specifically, such as Figure 2 As shown, the mounting base 20 is integrally connected to the bottom of the outer pitch ring 12, while each drive component 31 of the drive assembly 30 is connected to the inner pitch ring 11. The drive assembly 30 is entirely located within the annular region of the inner pitch ring 11 and rotatably contacts the surface of the mounting base 20 within the annular region via a slewing bearing 42. This arrangement makes efficient use of the internal space of the pitch bearing 10, eliminating the need to increase the overall volume of the wind turbine blades, and the drive assembly 30 is not exposed on the outside of the pitch bearing 10, thus improving the overall aesthetics.

[0034] When the fixing member 41 is rotatably connected to the mounting base 20 via the slewing bearing 42, the fixing member 41 is connected to the top end face of the outer slewing ring 422, and the top surface of the mounting base 20 is connected to the bottom end face of the inner slewing ring 421. When the drive body 311 transmits the load to the fixing member 41, the fixing member 41 can drive the outer slewing ring 422 to rotate relative to the inner slewing ring 421, thereby realizing the relative rotation between the fixing member 41 and the mounting base 20. Furthermore, the fixing member 41 and the mounting base 20 are spaced apart by the slewing bearing 42, so there will be no interference problems such as collision during rotation.

[0035] The slewing bearing 42 is a double-row four-point angular contact slewing bearing, which has strong bearing capacity for axial load and radial load, thereby effectively reducing the deformation and stress of the driving body 311 of each driving member 31 of the driving assembly 30 during work, and meeting the working requirements under a large driving torque of the driving assembly 30. It should be noted that the slewing bearing 42 of the embodiment of the present application includes but is not limited to a double-row four-point angular contact slewing bearing, and can also be other bearings with strong bearing capacity for axial load and radial load.

[0036] The driving member 31 is any one of a hydraulic oil cylinder, an electric push rod or a worm gear, and the mounting seat 20 is any one or a combination of multiple of cast iron, cast steel or a forging. It should be noted that the driving member 31 and the mounting seat 20 are not limited to the above structures or materials.

[0037] As shown in Figure 3 and Figure 4 , the embodiment of the present application, the fixed member 41 includes a connecting structure 411 and a fixed structure 412, the fixed structure 412 is movably installed on the connecting structure 411, the driving body 311 is detachably connected to the fixed structure 412, and the fixed member 41 is connected to the slewing outer ring 422 through the connecting structure 411.

[0038] In specific implementation, the driving body 311 of the driving member 31 can be fixed to the fixed structure 412, and the fixed structure 412 movably connects to the connecting structure 411 connected to the slewing outer ring 422. When the driving body 311 is subjected to a reaction force from the driving end 312, the fixed structure 412 connected to the driving body 311 drives the connecting structure 411 and the slewing outer ring 422 to rotate, and the fixed structure 412 and the connecting structure 411 can also move relative to each other, so that the driving member 31 at the driving body 311 can not only rotate, but also move in the fixed plane for adjustment, thereby decoupling the connection of the driving body 311, and further reducing the deformation and stress of the driving body connection.

[0039] As shown in Figure 3 and Figure 4 , the embodiment of the present application, the connecting structure 411 includes a first connecting part 413 and two groups of second connecting parts 414 connected to each other, the first connecting part 413 is connected to the slewing outer ring 422, and the two groups of second connecting parts 414 are oppositely arranged along the radial direction of the driving body 311. The opposite ends of the fixed structure 412 are movably connected to the two groups of second connecting parts 414 in one-to-one correspondence.

[0040] In specific implementation, the two groups of second connecting parts 414 are movably connected to the radial two sides of the fixing structure 412, and support the two sides of the fixing structure 412 and the driving body 311 fixedly installed in the fixing structure 412, so that the fixing structure 412 and the driving body 311 can be stably installed on the first connecting part 413 and the rotating outer ring 422, avoiding the disconnection between the driving member 31 and the second connecting part 414 when the driving member 31 is subjected to excessive load, and ensuring the overall installation stability of the driving member 31.

[0041] Specifically, each group of second connecting parts 414 has one second connecting part 414, that is, the radial opposite two sides of the driving body 311 are connected with one second connecting part 414, which has a simple structure, can ensure the installation stability of the driving member 31, and can also keep the overall weight of the variable pitch mechanism lighter, facilitating installation and maintenance.

[0042] Alternatively, each group of second connecting parts 414 can also include a plurality of second connecting parts 414, and the plurality of second connecting parts 414 of each group are arranged in sequence along the axial direction of the driving body 311, which can fix each position of the driving body 311 in the axial direction, further improving the installation stability of the driving body 311.

[0043] Specifically, the connecting structure 411 is a structure formed by forging, casting or split structure combination, and is not limited to the above structure.

[0044] As shown in Figure 3 and Figure 4 , the variable pitch mechanism of the embodiment of the application, wherein the fixing structure 412 includes an annular body 415 and a support shaft 416 protruding from the annular body 415 along the radial opposite two sides, and each support shaft 416 is movably connected to the corresponding second connecting part 414 through a bearing.

[0045] In specific implementation, the driving body 311 of the driving member 31 is fixed to the annular body 415, and the support shafts 416 on the two sides of the annular body 415 are movably supported on the two second connecting parts 414 through the bearings, thereby realizing the decoupling of the driving body fixed in the annular body 415 and balancing the bending moment of the driving body 311.

[0046] The arrangement of the bearing can support the support shaft 416 in all directions, and the support shaft 416 can also rotate slightly between the bearing and the corresponding second connecting part 414 to provide the floating of the driving body 311 at the driving end 312 of the driving member 31 during the extension and contraction process, thereby ensuring the extension and contraction stability of the driving end 312 and further ensuring the variable pitch stability of the variable pitch mechanism.

[0047] Specifically, each second connecting part 414 has a mounting hole for mounting a bearing, and the two protruding support shafts 416 of the annular body 415 can be mounted in the mounting holes of the two second connecting parts 414 through the bearing. The bearing can adopt a sliding bearing or a radial spherical bearing structure, which can meet the support requirements of the support shaft 416.

[0048] As shown in Figures 1 to 4 , the first connecting part 413 is connected to the top of the rotating outer ring 422, and the first connecting part 413 is in a partially circular plate structure. The outer edge of the first connecting part 413 is arc-shaped, the arc center of the arc-shaped outer edge of the first connecting part 413 coincides with the center of the rotating outer ring 422, and the radius of the arc-shaped outer edge of the first connecting part 413 is less than or equal to the radius of the rotating outer ring 422.

[0049] In specific implementation, the outer edge of the first connecting part 413 is arc-shaped, and the arc center of the arc-shaped outer edge coincides with the center of the rotating outer ring 422. Since the arc radius of the first connecting part 413 is small, when the first connecting part 413 connected to the top of the rotating outer ring 422 rotates together with the rotating outer ring 422, the outer edge of the first connecting part 413 will not protrude from the top surface of the rotating outer ring 422, thereby avoiding interference with other components in the variable pitch mechanism during rotation of the first connecting part 413. In addition, since the first connecting part 413 does not block the outer circumferential surface of the rotating outer ring 422, it will not affect the grease lubrication of the outer circumferential surface of the rotating outer ring 422. The outer circumferential surface of the rotating outer ring 422 has a plurality of oil injection holes distributed at intervals, which facilitates grease lubrication of the rotating bearing 42 from the outer circumferential surface.

[0050] In addition, as shown in Figure 1 , the first connecting part 413 is in a partially circular plate structure, that is, a part of the outer edge of the first connecting part 413 is arc-shaped, and the other part of the outer edge is linear. Such a shape provides a larger connection area for the connection of the second connecting part 414 and the first connecting part 413, so that the second connecting part 414 can be stably connected to the first connecting part 413.

[0051] Optionally, the first connecting part 413 can also be a fan ring structure, that is, a partial ring structure. The inner edge radius and the outer edge radius of the first connecting part 413 in the fan ring structure can be the same as the inner edge radius and the outer edge radius of the rotating outer ring 422, so as to ensure the connection area of the first connecting part 413 and the rotating outer ring 422, and further ensure the connection stability. The fan ring structure ensures that there is no overlapping part between the first connecting part 413 and the rotating inner ring 421. When the rotating inner ring 421 and the rotating outer ring 422 rotate relative to each other, the rotating inner ring 421 will not contact the first connecting part 413, thereby avoiding the influence on the relative rotation, and enabling the driving member 31 connected to the first connecting part 413 to rotate smoothly.

[0052] In the embodiment of the application, the first connecting part 413 has a connecting hole for penetrating the connecting member 43, and the rotating outer ring 422 is fixedly connected with the first connecting part 413 through the connecting member 43. In addition, the surface of the rotating inner ring 421 facing the mounting seat 20 has a positioning structure, and the mounting seat 20 has a positioning interface. The positioning structure and the positioning interface are positionally opposite and can be fixedly connected.

[0053] In the embodiment, the first connecting part 413 is fixedly connected with the rotating outer ring 422 by penetrating the connecting hole through the connecting member 43. The penetration of the connecting member 43 can ensure the transmission stability between the first connecting part 413 and the rotating outer ring 422, and ensure the synchronous rotation between the first connecting part 413 and the rotating outer ring 422. The rotating inner ring 421 is fixedly connected with the mounting seat 20 through the cooperation of the positioning structure and the positioning interface. Under the cooperation of the rotating outer ring 422 and the rotating inner ring 421, the rotating inner ring 421 can be stably arranged in the rotating outer ring 422. Therefore, the rotating inner ring 421 can be clamped and connected with the surface of the mounting seat 20 through the simple cooperation of the positioning structure and the positioning interface. Such a connection mode is simple in structure, easy to cooperate, and can also ensure the fixed connection between the rotating inner ring 421 and the mounting seat 20.

[0054] Specifically, the connecting member 43 is a bolt, which can be threadedly connected with the connecting hole penetrating the first connecting part 413, and the screw end of the connecting member 43 can also be threadedly connected with the rotating outer ring 422, so as to realize the fixed connection between the rotating outer ring 422 and the first connecting part 413.

[0055] The positioning structure of the rotating inner ring 421 is a protruding structure protruding towards the surface of the mounting seat 20, and the positioning interface of the mounting seat 20 is a recessed interface recessed in the surface thereof. The two can be clamped and connected, so as to realize the fixed connection, and prevent the relative movement between the mounting seat 20 and the rotating inner ring 421.

[0056] Optionally, the first connecting portion 413 and the rotating outer ring 422 can also be fixedly connected through a positioning pin; the mounting seat 20 and the rotating inner ring 421 can also be fixedly connected through the penetration of a connecting bolt or a positioning pin.

[0057] In the embodiment of the application, the mounting seat 20 has a mounting hole 21, which is located below the rotating bearing 42 and is in position opposite to and in communication with the rotating inner ring 421, and is used for injecting lubricating medium into the rotating inner ring 421. The inner surface of the rotating inner ring 421 has a plurality of oil injection holes distributed at intervals, which facilitates the injection of lubricating grease into the rotating bearing 42 from the inner surface of the rotating inner ring 421.

[0058] In the embodiment of the application, the mounting seat 20 has a mounting hole 21, which is located below the rotating bearing 42 and is in position opposite to and in communication with the rotating inner ring 421, and is used for injecting lubricating medium into the rotating inner ring 421. The inner surface of the rotating inner ring 421 has a plurality of oil injection holes distributed at intervals, which facilitates the injection of lubricating grease into the rotating bearing 42 from the inner surface of the rotating inner ring 421.

[0059] As shown in Figure 1 In the embodiment of the application, the drive assembly 30 further comprises a drive support 32 and a linkage 33, the linkages 33 are connected through the drive support 32, and each linkage 33 is fixedly connected to the variable-pitch inner ring 11, and the drive end 312 of each drive member 31 is movably connected to the corresponding linkage 33.

[0060] In the embodiment of the application, the drive end 312 of each drive member 31 is movably connected to the corresponding linkage 33, and when the drive end 312 is extended or retracted, the linkage 33 is driven to move, so that the variable-pitch inner ring 11 is driven to rotate. The drive end 312 and the linkage 33 can move relative to each other, so that the drive end 312 can drive the linkage 33 and the variable-pitch inner ring 11 to rotate only by extension and retraction, thereby realizing variable-pitch operation.

[0061] The linkages 33 are connected through the drive support 32, and under the connection of the drive support 32, the linkages 33 can move synchronously, thereby realizing stable control of the rotation of the variable-pitch inner ring 11. The drive support 32 can transmit and offset the load at the linkages 33, thereby reducing the load acting on each drive member 31 and reducing the deformation and stress of the drive member 31 during operation.

[0062] Specifically, the driving assembly 30 includes two driving members 31 and two linkage members 33, the two driving members 31 are arranged in a central symmetry within the pitch inner ring 11, when driving the pitch inner ring 11, the pitch inner ring 11 can be subjected to balanced force, thereby ensuring stable rotation effect.

[0063] As shown in Figure 1 and Figure 2 shown, the pitch mechanism of the embodiment of the application, wherein the linkage member 33 includes a linkage seat 331 and a transmission rod 332, the linkage seat 331 is fixedly connected to the pitch inner ring 11, the transmission rod 332 is sequentially provided in the linkage seat 331 and the driving end 312 along the direction perpendicular to the mounting seat 20, and at least one of the linkage seat 331 and the driving end 312 is in rotational connection with the transmission rod 332.

[0064] In specific implementation, the transmission rod 332 is in rotational connection with at least one of the linkage seat 331 and the driving end 312, which can ensure the relative rotation between the linkage seat 331 and the driving end 312, so that the extension and contraction action of the driving end 312 can be converted into the rotation of the pitch inner ring 11, thereby realizing the pitch operation.

[0065] Specifically, the transmission rod 332 is a bolt structure, the bolt structure is sequentially provided in the linkage seat 331 and the driving end 312, and is threadedly connected with the linkage seat 331, and the driving end 312 is rotatably mounted on the outer circumferential surface of the transmission rod 332. The bolt structure of the transmission rod 332 facilitates the disassembly and assembly of the linkage seat 331 and the driving end 312, thereby improving the assembly flexibility of the pitch mechanism as a whole.

[0066] The embodiment of the application also provides a wind turbine generator, which includes the pitch mechanism described above.

[0067] In specific implementation, the wind turbine generator of the embodiment of the application includes a wind power blade and a pitch mechanism, the wind power blade is adjusted in angle through the pitch mechanism. The pitch mechanism includes a pitch bearing 10, a mounting seat 20, a driving assembly 30 and a supporting assembly 40, the mounting seat 20 is connected to one of the pitch inner ring 11 and the pitch outer ring 12, the driving assembly 30 is mounted on the mounting seat 20 through the supporting assembly 40, the driving end 312 of the driving member 31 of the driving assembly 30 is connected with the other one of the pitch inner ring 11 and the pitch outer ring 12, and the other one of the pitch inner ring 11 and the pitch outer ring 12 is used for connecting the wind power blade, under the driving of the driving end 312, the relative rotation between the pitch inner ring 11 and the pitch outer ring 12 can be driven, thereby causing the relative rotation between the wind power blade and the mounting seat 20, and realizing the adjustment of the blade direction.

[0068] The support assembly 40 comprises a fixing member 41 and a slewing bearing 42, the driving body 311 of the driving member 31 is detachably connected to the fixing member 41 and connected to the slewing bearing 42 through the fixing member 41, the slewing bearing 42 comprises a slewing inner ring 421 and a slewing outer ring 422, the fixing member 41 is fixed to one of the slewing inner ring and the slewing outer ring, the other one is fixed to the mounting base 20, and the fixing member 41 and the mounting base 20 are respectively fixed to two sides of the slewing bearing 42 in the axial direction, and relative rotation between the two does not interfere, when the driving member 31 drives the variable-pitch bearing 10 to rotate, the driving member 31 is subjected to a reaction force, and the driving body 311 can also be subjected to a small-amplitude rotation between the slewing bearing 42 and the mounting base 20, wherein the slewing bearing 42 can simultaneously transmit the axial force and the radial force of the driving member 31, thereby improving the load condition of the driving member 31, and thus the support assembly 40 can realize the support and load condition improvement of the driving assembly 30 only through the fixing member 41 and the slewing bearing 42, the overall structure is simple, the weight is relatively light, and the installation and maintenance are facilitated.

[0069] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations 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 only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0070] The above is merely a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, modules and units can refer to the corresponding processes in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A variable pitch mechanism, characterized by The utility model relates to a variable pitch bearing (10) comprising a variable pitch inner race (11) and a variable pitch outer race (12), a mounting base (20) connected to one of the variable pitch inner race (11) and the variable pitch outer race (12), a driving assembly (30) comprising at least one driving member (31) comprising a driving body (311) and a driving end (312), the driving end (312) of each driving member (31) being connected to the other of the variable pitch inner race (11) and the variable pitch outer race (12), and a support assembly (40) by which the driving assembly (30) is rotatably mounted to the mounting base (20), the support assembly (40) comprising a fixing member (41) and a rotary bearing (42) comprising a rotary inner race (421) and a rotary outer race (422), one of the rotary inner race (421) and the rotary outer race (422) being connected to the mounting base (20) and the mounting base (20) being connected to one axial side of the rotary bearing (42), the other being connected to the fixing member (41) and the fixing member (41) being connected to the other axial side of the rotary bearing (42), the driving body (311) of the driving member (31) being connected to the fixing member (41). The fixing member (41) comprises a connecting structure (411) and a fixing structure (412), the fixing structure (412) being movably mounted to the connecting structure (411), the driving body (311) being detachably connected to the fixing structure (412), and the fixing member (41) being connected to the rotary outer race (422) through the connecting structure (411). The connecting structure (411) comprises a first connecting part (413) and two groups of second connecting parts (414) connected to each other, the first connecting part (413) being connected to the rotary outer race (422), the two groups of second connecting parts (414) being oppositely arranged along the radial direction of the driving body (311), and opposite ends of the fixing structure (412) being movably connected to the two groups of second connecting parts (414) one by one. The fixing structure (412) comprises an annular body (415) and a support shaft (416) protruding from opposite sides of the annular body (415) in the radial direction, each support shaft (416) being movably connected to the corresponding second connecting part (414) through a bearing member. The first connecting part (413) is connected to the top of the rotary outer race (422), the first connecting part (413) being in the form of a partially circular plate structure, a part of the outer edge of the first connecting part (413) being in the form of an arc, the center of the arc of the arc-shaped outer edge of the first connecting part (413) coinciding with the center of the circle of the rotary outer race (422), and the radius of the arc-shaped outer edge of the first connecting part (413) being less than or equal to the radius of the rotary outer race (422).

2. The pitch mechanism of claim 1, wherein, ​ 3. The variable pitch mechanism of claim 2, wherein, ​ 4. The variable pitch mechanism of claim 3, wherein, ​ 5. The pitch mechanism of claim 3, wherein, ​ 6. The pitch mechanism of claim 3, wherein, The first connecting part (413) has a connecting hole for penetrating a connecting piece (43), and the swivel outer ring (422) is fixedly connected with the first connecting part (413) through the connecting piece (43); and / or, The surface of the swivel inner ring (421) facing the mounting base (20) has a positioning structure, and the mounting base (20) has a positioning interface, the positioning structure is opposite to the positioning interface and can be fixedly connected.

7. The variable pitch mechanism of claim 5, wherein, The mounting base (20) has a mounting through hole (21) below the swivel bearing (42), and the mounting through hole (21) is opposite to the swivel inner ring (421) and is arranged in communication, and the mounting through hole (21) is used for injecting lubricating medium into the swivel inner ring (421).

8. The pitch mechanism of claim 1, wherein, The swivel bearing (42) is a double-row four-point angular contact bearing.

9. The pitch mechanism of claim 1, wherein, The driving assembly (30) further comprises a driving support (32) and a linkage (33), a plurality of linkage (33) are connected through the driving support (32), and each linkage (33) is fixedly connected to the variable pitch inner ring (11), and the driving end (312) of each driving piece (31) is movably connected to the corresponding linkage (33).

10. The pitch mechanism of claim 9, wherein, The linkage (33) comprises a linkage seat (331) and a transmission rod (332), the linkage seat (331) is fixedly connected to the variable pitch inner ring (11), the transmission rod (332) is sequentially penetrated in the linkage seat (331) and the driving end (312) along the direction perpendicular to the mounting base (20), and at least one of the linkage seat (331) and the driving end (312) is rotatably connected with the transmission rod (332).

11. A wind power unit, characterized in that A variable pitch mechanism comprising any one of claims 1 to 10. A variable pitch mechanism comprising any one of claims 1 to 10.

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