A bearing assembly for a hydraulic pitch system of a wind turbine generator set

Abstract

The present invention discloses a bearing assembly of a hydraulic variable pitch system of a wind turbine generator set, comprising a hydraulic actuator, a variable pitch bearing, a web and a hydraulic actuator fixing structure. The variable pitch bearing comprises an outer ring, an inner ring and a roller between the outer ring and the inner ring. The outer periphery of the outer ring is fixedly connected to the hub, the inner side of the inner ring is connected to the web and the outer periphery of the inner ring is connected to the blades. A protrusion structure and at least one manhole structure are provided on the web in the same direction as the hub. One end of the hydraulic actuator is rotatably connected to the inner side of the hub, and the other end of the hydraulic actuator is connected to the upper part of the protrusion structure through the hydraulic actuator fixing structure, and a spherical bearing is provided at the end of the hydraulic actuator connected to the protrusion structure. The hydraulic variable pitch system designed by the present invention has a compact structure, a small volume, occupies less space and is convenient for maintenance. The single web structure effectively reduces the manufacturing cost, and the protrusion structure on the web is integrally formed, eliminating separate connecting components, saving manufacturing costs, and reducing the complexity of the assembly process of the bearing assembly of the hydraulic variable pitch system.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a bearing assembly of a hydraulic pitch control system of a wind generator set. Background Art

[0002] The variable pitch wind turbine achieves the purpose of adjusting the power generation and wind load control of the wind turbine by changing the blade pitch angle.

[0003] At present, there are two main technical forms of wind turbine pitch systems: electric and hydraulic. Among them, the hydraulic pitch system has the characteristics of large output torque per unit mass, few electrical components, and high stability. It is foreseeable that it will be widely used in wind turbines with increasingly longer blades, increasing capacity, and high stability requirements.

[0004] The hydraulic pitch system of the impeller part mainly includes: hydraulic actuator and pitch bearing assembly.

[0005] The continuous lengthening of wind turbine blades has increased the blade root load of wind turbines. The common practice is to increase the hub and pitch bearings, which has led to an increase in the overall cost of wind turbines.

[0006] The variable pitch bearing assembly proposed in CN206770136 includes two webs and a fixed seat assembly, which can effectively enhance the stiffness of the variable pitch bearing and the entire impeller system and improve the stress condition. The fixed seat can better support the hydraulic actuator connecting pin and improve the stress condition of the pin. The design of the fixed seat between the two webs reduces the deformation of the webs. However, this solution has many components, complex assembly and high manufacturing cost.

[0007] The variable pitch bearing assembly of WO2012069062 includes a fixed web and an annular driving structure, which can effectively enhance the stiffness of the variable pitch bearing and the entire impeller system and improve the stress condition. The hydraulic actuator is installed on the fixed web, and the actuator force transmission component is not the entire disc-shaped web, which can save materials and reduce raw material costs. The structural parts of this solution are complex in shape, difficult to assemble, and have high manufacturing costs. Summary of the invention

[0008] In view of the problems existing in the prior art, an object of the present invention is to provide a bearing assembly for a hydraulic pitch system of a wind turbine generator set.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a bearing assembly of a hydraulic pitch system of a wind turbine generator set, comprising a hydraulic actuator, a pitch bearing, a web and a hydraulic actuator fixing structure, wherein the pitch bearing comprises an outer ring, an inner ring and a roller between the outer ring and the inner ring, and is used for relative rotation between the outer ring and the inner ring along a rotation axis, wherein the outer ring is fixedly connected to a hub at its outer periphery, the inner side of the inner ring is connected to a web and the outer periphery of the inner ring is connected to blades;

[0010] A protruding structure and at least one manhole structure are provided on the web in the same direction as the wheel hub. One end of a hydraulic actuator is rotatably connected to the inner side of the wheel hub. The other end of the hydraulic actuator is connected to the upper part of the protruding structure through a hydraulic actuator fixing structure, and a spherical bearing is provided at the end where the hydraulic actuator is connected to the protruding structure.

[0011] Specifically, the raised structure is in the shape of an elongated strip and is symmetrical relative to the center of the axis of the pitch bearing. The height of the raised structure and the connection position of the hydraulic actuator on the hub are flush with the mounting plane of the web and the pitch bearing. Grooves for inserting the pin are provided at both ends of the elongated strip structure. The pressure plate provided on the upper part of the hydraulic actuator fixing structure is fixed to the raised structure by bolts. A sleeve is provided on the outside of the bolt and is clamped between the pressure plate and the raised structure to limit the radial movement of the pin. The lower end of the pin provided on the hydraulic actuator fixing structure is inserted into the groove of the raised structure, and the upper part of the pin passes through the bearing support, the spherical bearing of the hydraulic actuator and the pressure plate. The top of the pin is connected to a pressure sheet fixed on the pressure plate to limit the axial movement of the pin.

[0012] Specifically, the pin shaft adopts a stepped cylindrical structure and is provided with a small diameter end, a large diameter end and a step position. The small diameter end is cooperated and connected with the groove of the raised structure, the large diameter end is cooperated and connected with the radial shaft hole of the pressure plate, and the step position contacts with the inner ring of the spherical bearing at the end of the hydraulic actuator, thereby limiting the axial movement of the end of the hydraulic actuator along the pin shaft.

[0013] Specifically, the bearing support adopts an annular structure, the lower end of the bearing support contacts the protruding structure, and the upper end of the bearing support contacts the inner ring of the spherical bearing, which is used to limit the movement of the inner ring of the ball bearing at the end of the hydraulic actuator along its own axial direction.

[0014] Specifically, the sleeve is made of a plurality of hollow cylinders of the same size or an integrally formed semicircular structure, and the length of the sleeve controls the distance between the pressure plate and the web.

[0015] Specifically, the pressing plate is a plate-shaped structural member, which is fixed on the pressing plate by bolts and is located on the upper part of the pin shaft, and is used to press the pin shaft to limit the axial movement of the pin shaft.

[0016] Specifically, the raised structure is a hollow conical structure and is located on the web near the hub side. The height of the raised structure and the connection position of the hydraulic actuator on the hub are flush with the mounting plane of the web and the pitch bearing. A pin is provided on the upper part of the raised structure. The pin passes through the inner ring of the spherical bearing. A pressure plate is fixed to the upper end of the pin by bolts for limiting the axial freedom of the inner ring of the spherical bearing. The other end of the hydraulic actuator is hinged to the hub.

[0017] Specifically, the web is in the shape of a disc or a long strip, and is connected to the end face of the inner ring of the variable pitch bearing close to the hub.

[0018] Specifically, the protrusion structure, the manhole structure and the web are integrally formed to enhance the rigidity of the web, and the manhole structure is used for maintenance personnel to pass through.

[0019] The present invention has the following beneficial effects:

[0020] The hydraulic variable pitch system designed in the present invention has a compact structure, small size, occupies little space, and is easy to maintain; the single web structure effectively reduces manufacturing costs, and the raised structure on the web is integrally formed, eliminating separate connecting components, further saving manufacturing costs, and has a simple structure, reducing the complexity of the assembly process of the bearing assembly of the hydraulic variable pitch system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a first embodiment of a hydraulic pitch control system for a wind turbine generator set;

[0022] Figure 2 It is a structural schematic diagram of a first embodiment of a bearing assembly of a hydraulic pitch control system of a wind turbine generator set;

[0023] Figure 3 This is a structural schematic diagram of a fixing structure of a hydraulic actuator according to Embodiment 1;

[0024] Figure 4 This is a schematic structural diagram of a web plate of Embodiment 1;

[0025] Figure 5 This is a structural schematic diagram of a second embodiment of a hydraulic pitch control system for a wind turbine generator set.

[0026] In the figure: 1-wheel hub; 2-hydraulic actuator fixing structure; 3-web; 4-hydraulic actuator; 5-pitch bearing; 2.1-pressure plate; 2.2-pressure sheet; 2.3-sleeve; 2.4-pin shaft; 2.5-bearing support; 3.1-protruding structure; 3.2-manhole; 5.1-outer ring; 5.2-inner ring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] like Figure 1-5As shown, a bearing assembly of a hydraulic pitch system of a wind turbine generator set includes a hydraulic actuator 4, a pitch bearing 5, a web 3 and a hydraulic actuator fixing structure 2. The pitch bearing 5 includes an outer ring 5.1, an inner ring 5.2 and a roller between the outer ring 5.1 and the inner ring 5.2, which is used for relative rotation between the outer ring 5.1 and the inner ring 5.2 along the rotation axis. The outer periphery of the outer ring 5.1 is fixedly connected to the hub 1, the inner side of the inner ring 5.2 is connected to the web 3, and the outer periphery of the inner ring 5.2 is connected to the blades; a protruding structure 3.1 and at least one manhole structure 3.2 are provided on the web 3 in the same direction as the hub 1, one end of the hydraulic actuator 4 is rotatably connected to the inner side of the hub 1, and the other end of the hydraulic actuator 4 is connected to the upper part of the protruding structure 3.1 through the hydraulic actuator fixing structure 2, and a spherical bearing is provided at the end of the hydraulic actuator 4 connected to the protruding structure 3.1.

[0029] The web 3 is in the shape of a disk or a long strip, and is connected to the end face of the inner ring of the pitch bearing 5 close to the hub 1. The raised structure 3.1 and the manhole structure 3.2 are integrally formed with the web 3 to enhance the rigidity of the web 3, and the manhole structure 3.2 is used for maintenance personnel to pass through. The height of the raised structure 3.1 is flush with the connection point of the actuator 4 on the hub 1 in the direction of the pitch bearing axis, ensuring that the actuator 4 moves in a plane parallel to the web 3, reducing the weight in other directions, and improving the stress condition of the web 3.

[0030] like Figure 1-4 As shown, in the embodiment 1 of the present invention, the double-cylinder hydraulic pitch system, the raised structure 3.1 is in the shape of an elongated strip and is symmetrical relative to the axis center of the pitch bearing 5. The height of the raised structure 3.1 and the connection position of the hydraulic actuator 4 on the hub 1 are flush with the mounting plane of the web 3 and the pitch bearing 5. Grooves for inserting the pin 2.4 are provided at both ends of the elongated strip structure. The hydraulic actuator fixing structure 2 is used for connecting the end of the hydraulic actuator 4 with the web 3, and mainly comprises a pressure plate 2.1, a pressure sheet 2.2, a sleeve 2.3, a pin 2.4, a bearing support 2.5 and a fastener. There is a spherical bearing at the end of the hydraulic actuator 4, and the pin 2.4 passes through the pressure plate 2.1, the inner ring of the spherical bearing, the bearing support 2.5 and the circular ring on the raised structure 3.1 on the web. The end of the hydraulic actuator 4 is hingedly fixed on the pitch web 3; the distance between the pressure plate 2.1 and the web 3 is controlled by the length of the sleeve 2.3; the fastening bolts pass through the sleeve 2.3 to fix the pressure plate 2.1 to the web 3, and the pressure piece 2.2 is fixed to the pressure plate 2.1 by bolts to limit the axial movement of the pin 2.4. The pin 2.4 has a step position, which is stuck in the inner ring of the ball bearing of the hydraulic actuator 4 to limit the axial freedom of the inner ring of the ball bearing. The bearing support 2.5 is an annular structure, and one end of the bearing support 2.5 is in contact with the web protrusion structure 3.1, and the other end of the bearing support 2.5 is in contact with the inner ring of the ball bearing at the end of the hydraulic actuator 4, so as to limit the movement of the inner ring of the ball bearing at the end of the hydraulic actuator 4 along its own axis.

[0031] The pin 2.4 adopts a stepped cylindrical structure and is provided with a small diameter end, a large diameter end and a step position. The small diameter end is matched and connected with the groove of the raised structure, and the large diameter end is matched and connected with the radial shaft hole of the pressure plate 2.1. The step position contacts the inner ring of the spherical bearing at the end of the hydraulic actuator 4, limiting the axial movement of the end of the hydraulic actuator 4 along the pin 2.4; the bearing support 2.5 adopts an annular structure, the lower end of the bearing support 2.5 contacts the raised structure 3.1, and the upper end of the bearing support 2.5 contacts the inner ring of the spherical bearing, which is used to limit the movement of the inner ring of the spherical bearing at the end of the hydraulic actuator 4 along its own axial direction; the sleeve 2.3 adopts a plurality of hollow cylinders of the same size or an integrally formed semicircular structural member, and the length of the sleeve 2.3 controls the distance between the pressure plate 2.1 and the web 3; the pressing plate 2.2 adopts a plate-like structural member, which is fixed to the pressure plate 2.1 by bolts and is located on the upper part of the pin 2.4, and is used to press the pin 2.4 to limit the axial movement of the pin 2.4.

[0032] like Figure 5 As shown, in the single-cylinder hydraulic pitch system of embodiment 2 of the present invention, the protruding structure 3.1 in the single-cylinder hydraulic pitch system is a hollow conical structure distributed on the pitch circle with the crank of the pitch crank structure as the radius and is located on the side of the web 3 close to the hub 1. The height of the protruding structure 3.1 and the connection position of the hydraulic actuator 4 on the hub 1 are flush with the mounting plane of the web 3 and the pitch bearing 5; the pitch bearing 5, the web 3 and the hydraulic actuator fixing structure 2 together constitute a pitch system bearing assembly, wherein the outer ring 5.1 of the pitch bearing 5 is connected to the hub 1, and the inner ring 5.2 is connected to the web 3 and the blades. The protruding structure 3.1 on the web 3 is conical, with a pin at the end, which passes through the inner ring of the spherical bearing at the end of the hydraulic actuator 4, and a fixed pressing plate is fixed to the end of the pin by bolts to limit the axial latitude of the inner ring of the spherical bearing. The other end of the hydraulic actuator 4 is hinged to the wheel hub 1. The extension and retraction of the hydraulic rod of the hydraulic actuator 4 generates a push-pull force which is transmitted to the inner ring 5.2 of the pitch bearing 5 through the web 3 in the form of torque. The end of the actuator 4 connected to the web 3 rotates around the axis of the pitch bearing 5, performing a crank-connecting rod action, thereby driving the blades to rotate around the rotating axis of the pitch bearing to complete the pitch action.

[0033] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0034] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A bearing assembly for a hydraulic pitch system of a wind turbine generator set, characterized in that: It includes a hydraulic actuator, a pitch bearing, a web and a hydraulic actuator fixing structure. The pitch bearing includes an outer ring, an inner ring and a roller between the outer ring and the inner ring, which is used for relative rotation between the outer ring and the inner ring along the rotation axis. The outer periphery of the outer ring is fixedly connected to the hub, the inner side of the inner ring is connected to the web and the outer periphery of the inner ring is connected to the blade. A protruding structure and at least one manhole structure are provided on the web in the same direction as the wheel hub, one end of a hydraulic actuator is rotatably connected to the inner side of the wheel hub, the other end of the hydraulic actuator is connected to the upper part of the protruding structure through a hydraulic actuator fixing structure, and a spherical bearing is provided at the end of the hydraulic actuator connected to the protruding structure; The raised structure is in the shape of an elongated strip and is symmetrical relative to the center of the axis of the pitch bearing. The height of the raised structure and the connection position of the hydraulic actuator on the hub are flush with the mounting plane of the web and the pitch bearing. Grooves for inserting the pin are provided at both ends of the elongated raised structure. The pressure plate provided on the upper part of the hydraulic actuator fixing structure is fixed to the raised structure by bolts. A sleeve is provided on the outer sleeve of the bolt and is clamped between the pressure plate and the raised structure to limit the radial movement of the pin. The lower end of the pin provided on the hydraulic actuator fixing structure is inserted into the groove of the raised structure. The upper part of the pin passes through the bearing support, the spherical bearing of the hydraulic actuator and the pressure plate. The top of the pin is connected to a pressure sheet fixed to the pressure plate to limit the axial movement of the pin. The bearing support adopts a circular ring structure, the lower end of the bearing support contacts the raised structure, and the upper end of the bearing support contacts the inner ring of the spherical bearing, which is used to limit the movement of the inner ring of the spherical bearing at the end of the hydraulic actuator along its own axis direction; The pin shaft adopts a stepped cylindrical structure and is provided with a small diameter end, a large diameter end and a step position. The small diameter end is matched and connected with the groove of the raised structure, the large diameter end is matched and connected with the radial shaft hole of the pressure plate, and the step position contacts with the inner ring of the spherical bearing at the end of the hydraulic actuator, thereby limiting the axial movement of the end of the hydraulic actuator along the pin shaft.

2. The wind turbine hydraulic pitch system bearing assembly according to claim 1, characterized in that: The sleeve is made of a plurality of hollow cylinders of the same size or an integrally formed semicircular structure, and the length of the sleeve controls the distance between the pressure plate and the web.

3. The wind turbine generator hydraulic pitch system bearing assembly according to claim 1, characterized in that: The pressing piece is a plate-shaped structural member, which is fixed on the pressing plate by bolts and is located on the upper part of the pin shaft, and is used to press the pin shaft to limit the axial movement of the pin shaft.

4. The wind turbine generator hydraulic pitch system bearing assembly according to claim 1, characterized in that: The web is in the shape of a disc or a long strip, and is connected to the end face of the inner ring of the variable pitch bearing close to the hub.

5. The wind turbine generator hydraulic pitch system bearing assembly according to claim 1, characterized in that: The protrusion structure, the manhole structure and the web are integrally formed to enhance the rigidity of the web, and the manhole structure is used for maintenance personnel to pass through.

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