Impeller assembly, method of assembling an impeller, and wind turbine generator system

Abstract

The application relates to a blade wheel assembly, a blade wheel assembling method and a wind turbine generator set. The blade wheel assembly is applied to the wind turbine generator set and comprises blades, a hub, a variable pitch bearing and a pressing assembly. The hub comprises a base body and a bearing mounting portion. The base body has a containing cavity and two or more than two openings communicating with the containing cavity. The wall part of the base body surrounding each opening extends along the axial direction of the opening to form the bearing mounting portion. The variable pitch bearing is arranged inside each opening. The variable pitch bearing comprises a rotatingly matched outer ring and an inner ring. The outer ring is arranged inside the bearing mounting portion and is in interference fit with the bearing mounting portion. The inner ring is connected with the blade. The pressing assembly is connected to the side of each bearing mounting portion away from the base body. The pressing assembly at least partially abuts against the outer surface of the outer ring in the axial direction away from the containing cavity. The application can improve the service life and reliability and reduce the cost.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to rotor assemblies, rotor assembly methods, and wind turbine generator sets. Background Technology

[0002] In existing wind turbine generator sets, the blade pitch angle is adjusted by driving the inner or outer ring of the pitch bearing through the pitch power mechanism. The inner ring of the pitch bearing is connected to the hub, and the outer ring is connected to the blade, so that the outer ring pitch can be adjusted, and the inner ring pitch can be adjusted in the opposite way.

[0003] Whether it is an inner ring pitch type or an outer ring pitch type, the pitch bearing is connected to the hub by bolts. This connection method requires bolt holes to be machined on both the pitch bearing race and the hub flange. These bolt holes are prone to safety problems such as corrosion and fatigue damage, which reduces the life of the pitch bearing. Maintenance or even replacement of the pitch bearing is required to continue to complete the pitch operation, resulting in high economic losses. Summary of the Invention

[0004] This application provides an impeller assembly, an impeller assembly method, and a wind turbine generator set, which can improve service life and reliability, thereby reducing costs.

[0005] On one hand, according to an embodiment of this application, an impeller assembly is proposed for use in a wind turbine generator set. The impeller assembly includes: blades; a hub, including a base and a bearing mounting portion, the base having a receiving cavity and two or more openings communicating with the receiving cavity, the wall portion of the base surrounding each opening extending axially along the opening to form the bearing mounting portion; a pitch bearing, disposed inside each opening, the pitch bearing including a rotating outer ring and an inner ring, the outer ring being disposed inside the bearing mounting portion and interference-fitted with the bearing mounting portion, the inner ring being connected to the blades; and a clamping assembly connected to the side of each bearing mounting portion away from the base, the clamping assembly at least partially abutting against the outer surface of the outer ring axially away from the receiving cavity.

[0006] According to one aspect of the embodiments of this application, the clamping assembly includes a limiting disc and a plug-in assembly. The limiting disc presses against the bearing mounting portion and is detachably connected to the bearing mounting portion through the plug-in assembly. The limiting disc abuts against the outer surface of the outer ring that is axially away from the receiving cavity. The periphery of the limiting disc extends axially and engages with the outer peripheral surface of the bearing mounting portion.

[0007] According to one aspect of the embodiments of this application, the limiting disk includes two or more connecting units that are circumferentially distributed along the opening and connected to each other, and the connecting units have an arc-shaped structure.

[0008] According to one aspect of the embodiments of this application, the plug-in assembly includes a plurality of fasteners that are axially inserted into a limiting disc and a hub to connect the limiting disc and the hub.

[0009] According to one aspect of the embodiments of this application, the limiting plate protrudes radially to the side facing the hub and forms a snap-fit ​​protrusion, and the bearing mounting part is provided with a snap-fit ​​groove on the side facing the snap-fit ​​protrusion, and the snap-fit ​​protrusion extends into the snap-fit ​​groove and snaps into the snap-fit ​​groove.

[0010] According to one aspect of the embodiments of this application, along the radial direction of the opening, the base body at least partially protrudes from the inner surface of the bearing mounting portion and forms a first boss, and the outer ring abuts against the first boss on the side axially away from the clamping assembly.

[0011] According to one aspect of the embodiments of this application, the impeller assembly further includes a limiting member disposed on the first boss, and along the axial direction, one of the limiting member and the outer ring extends at least partially into the interior of the other.

[0012] According to one aspect of the embodiments of this application, the limiting member includes two or more locating pins extending axially, and two or more locating holes are provided on the outer ring, with each locating pin inserted into one of the locating holes.

[0013] According to one aspect of the embodiments of this application, the impeller assembly further includes a motor and a drive wheel connected to the output end of the motor, the drive wheel meshing with the inner ring.

[0014] According to one aspect of the embodiments of this application, the impeller assembly further includes a detector and a trigger. The detector is disposed on the inner ring on the side radially away from the outer ring and can rotate with the inner ring. The trigger is connected to the hub and can provide a trigger signal when the trigger is aligned with the detector.

[0015] On the other hand, according to an embodiment of this application, an impeller assembly method is proposed, comprising: providing a hub, the hub including a base and a bearing mounting portion, the base having a receiving cavity and two or more openings communicating with the receiving cavity, the wall portion of the base surrounding each opening extending axially along the opening to form the bearing mounting portion; heating the bearing mounting portion to deform it to a predetermined size; placing a pitch bearing into the bearing mounting portion, the pitch bearing including an inner ring and an outer ring for rotational engagement; cooling the bearing mounting portion to cool and shrink the axial mounting portion and make it interference fit with the outer ring; connecting clamping components to the side of the bearing mounting portion away from the base, the clamping components at least partially abutting against the outer surface of the outer ring axially away from the receiving cavity; and connecting blades to the inner ring.

[0016] According to one aspect of the present application, the step of heating the bearing mounting portion to deform it to a predetermined size includes: placing an annular heating element on each bearing mounting portion of the hub, the annular heating element abutting against the inner surface of the bearing mounting portion; and energizing the annular heating element to heat the bearing mounting portion.

[0017] In another aspect, an embodiment of this application proposes a wind turbine generator set, including the rotor assembly as described above.

[0018] The impeller assembly, impeller assembly method, and wind turbine generator set provided in this application include an impeller assembly comprising blades, a hub, a pitch bearing, and a clamping assembly. The pitch bearing is inserted into the bearing mounting portion of the hub through an opening. Its outer ring is interference-fitted with the inner side of the bearing mounting portion, and its inner ring is connected to the blade. The outer ring and inner ring are rotatably fitted, allowing the blade to rotate relative to the hub, thus achieving pitch control. A clamping assembly is provided on the side of each bearing mounting portion away from the base, and at least a portion of the clamping assembly abuts against the outer surface of the outer ring axially away from the receiving cavity. That is, the pitch bearing is clamped between the clamping assembly and the bearing mounting portion. By using the clamping assembly to connect the pitch bearing to the bearing mounting portion, there is no need to connect the pitch bearing to the hub using bolts. In other words, there is no need to provide connecting holes for bolts on the pitch bearing. This reduces the size of the pitch bearing, avoids safety issues such as rust and fatigue damage caused by holes, extends the service life and reliability of the pitch bearing, reduces maintenance and replacement frequency, and thus reduces costs. Attached Figure Description

[0019] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of a wind turbine generator set according to an embodiment of this application;

[0021] Figure 2 This is a partial structural schematic diagram of an impeller assembly according to an embodiment of this application;

[0022] Figure 3 This is a partial structural diagram of the clamping component in an impeller assembly according to an embodiment of this application;

[0023] Figure 4 for Figure 2 Enlarged structural diagram at point P;

[0024] Figure 5 for Figure 2 Enlarged structural diagram at point Q;

[0025] Figure 6 This is a partial structural schematic diagram of an impeller assembly according to another embodiment of this application;

[0026] Figure 7 This is a flowchart illustrating an impeller assembly method according to an embodiment of this application.

[0027] in:

[0028] 100 - Impeller assembly;

[0029] 10-Blade; 20-Hub; 21-Base; 211-Receiving cavity; 212-Opening; 213-First boss; 22-Bearing mounting part; 221-Slot;

[0030] 30 - Pitch bearing; 31 - Outer ring; 32 - Inner ring;

[0031] 40 - Clamping assembly; 41 - Limiting disc; 411 - Connecting unit; 412 - Snap-fit ​​protrusion; 42 - Insertion assembly; 421 - Fastener;

[0032] 50-Positioning pin;

[0033] 61-Motor; 71-Detector; 72-Flip-flop;

[0034] 200 - Tower; 300 - Nacelle; 310 - Generator;

[0035] X - Axial direction; Y - Circumferential direction; Z - Radial direction. Detailed Implementation

[0036] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0037] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the impeller assembly, impeller assembly method, or wind turbine generator set of this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] To better understand this application, the following will be combined with... Figures 1 to 7 The impeller assembly, impeller assembly method, and wind turbine generator set are described in detail according to the embodiments of the application.

[0039] Please see Figure 1 , Figure 1 This is a schematic diagram of a wind turbine generator set according to one embodiment of this application. The embodiment provides a wind turbine generator set including an rotor assembly 100, a tower 200, a nacelle 300, and a generator 310. The tower 200 is connected to the wind turbine foundation, the nacelle 300 is located at the top of the tower 200, and the generator 310 is located in the nacelle 300. In some examples, the generator 310 may be located outside the nacelle 300; in other examples, it may be located inside the nacelle 300. The rotor assembly 100 includes blades 10 and a hub 20. Multiple blades 10 are connected to the hub 20. When wind power acts on the blades 10, it drives the entire rotor assembly 100 and the generator 310 to rotate, converting wind energy into electrical energy.

[0040] In wind turbine generators, pitch control technology is typically used to better capture wind energy and convert it into electrical energy. This improves the wind turbine's ability to capture wind energy, increasing its availability and power generation. Pitch control requires the blades 10 to rotate relative to the hub 20. Therefore, to meet the rotational connection requirements between the hub 20 and the blades 10, the blades 10 need to be connected to the hub 20 via a pitch bearing 30.

[0041] The pitch bearing 30 includes an inner ring 32 and an outer ring 31 that are rotatably connected. One of the inner ring 32 and the outer ring 31 is connected to the hub 20 and the other is connected to the blade 10. In existing wind turbine generator sets, the hub 20 and the pitch bearing 30 are usually bolted together during the assembly of the rotor assembly 100. Bolt holes are provided on both the hub 20 and the bearing sleeve of the pitch bearing 30. However, these bolt holes are prone to safety problems such as corrosion and fatigue damage, which reduces the life of the pitch bearing 30. Maintenance or even replacement of the pitch bearing 30 is required to continue pitch operation, resulting in significant economic losses.

[0042] To address the aforementioned shortcomings, this application provides a novel impeller assembly 100 that extends service life and reliability, reduces maintenance and replacement frequency, and thus lowers costs. The impeller assembly 100 proposed in this application can be manufactured and sold as an independent component, or it can be used in the aforementioned embodiments as part of a wind turbine generator set.

[0043] Please see Figure 1 as well as Figure 2This application provides an impeller assembly 100 for use in a wind turbine generator set. The impeller assembly 100 includes blades 10, a hub 20, a pitch bearing 30, and a clamping assembly 40. The hub 20 includes a base 21 and a bearing mounting portion 22. The base 21 has a receiving cavity 211 and two or more openings 212 communicating with the receiving cavity 211. The wall portion of the base 21 surrounding each opening 212 extends along the axial direction X of the opening 212 to form the bearing mounting portion 22. The pitch bearing 30 is disposed inside each opening 212. The pitch bearing 30 includes a rotating outer ring 31 and an inner ring 32. The outer ring 31 is disposed inside the bearing mounting portion 22 and is interference-fitted with the bearing mounting portion 22. The inner ring 32 is connected to the blades 10. The clamping assembly 40 is connected to the side of each bearing mounting portion 22 away from the base 21. The clamping assembly 40 at least partially abuts against the outer surface of the outer ring 31 away from the receiving cavity 211 in the axial direction X.

[0044] The base 21 of the hub 20 has a receiving cavity 211 and two or more openings 212 communicating with the receiving cavity 211. Optionally, the number of openings 212 can be set to two, or of course, it can be set to multiple. For example, the number of openings 212 can be the same as that of the blades 10.

[0045] The wall portion of the base 21 that encloses each opening 212 extends along the axial direction X of the opening 212 to form a bearing mounting portion 22. Each pitch bearing 30 can be respectively disposed on the bearing mounting portion 22 in each opening 212, which is conducive to the assembly and positioning of the pitch bearing 30 and improves the assembly efficiency.

[0046] The pitch bearing 30 includes an outer ring 31 and an inner ring 32 that are rotatably fitted. The outer ring 31 is disposed inside the bearing mounting part 22 and is interference-fitted with the bearing mounting part 22. The inner ring 32 is connected to the blade 10 so that the blade 10 can rotate relative to the hub 20 to realize the pitch function of the blade 10.

[0047] When the impeller assembly 100 provided in this application is used in a wind turbine generator set, the bearing mounting part 22 provided thereon can be used to make an interference fit with the outer ring 31 of the pitch bearing 30, and the blade 10 is connected to the inner ring 32 of the pitch bearing 30, thereby rotatably connecting the blade 10 through the pitch bearing 30.

[0048] The outer ring 31 of the pitch bearing 30 is interference-fitted with the bearing mounting portion 22, which provides a limiting function to prevent radial Z-displacement of the pitch bearing 30 and ensure safety. Furthermore, this design enhances the connection strength between the pitch bearing 30 and the bearing mounting portion 22, further improving the safety and reliability of the impeller assembly 100.

[0049] The clamping assembly 40 is disposed on the side of the bearing mounting portion 22 away from the base 21. The clamping assembly 40 abuts against the bearing mounting portion 22, and at least a portion of the clamping assembly 40 also abuts against the outer surface of the outer ring 31 away from the receiving cavity 211 in the axial X direction. That is, at least a portion of the pitch bearing 30 is clamped between the clamping assembly 40 and the bearing mounting portion 22 in the axial X direction. The clamping assembly 40 and the bearing mounting portion 22 work together to provide the pitch bearing 30 with an axial X clamping force to prevent the pitch bearing 30 from undergoing axial X displacement and to ensure safety.

[0050] The impeller assembly 100 provided in this application embodiment connects the clamping assembly 40 to the side of each bearing mounting portion 22 away from the base 21, and at least part of the clamping assembly 40 abuts against the outer surface of the outer ring 31 away from the receiving cavity 211 in the axial direction X, so that the outer ring 31 is fixed between the clamping assembly 40 and the bearing mounting portion 22 under the clamping force of the clamping assembly 40. That is, by using the clamping assembly 40, the pitch bearing 30 and the hub 20 are no longer connected by bolts. In other words, there is no need to provide connecting holes for placing bolts on the pitch bearing 30. This can reduce the size of the pitch bearing 30, avoid safety problems such as rust and fatigue damage caused by holes, extend the service life and reliability of the pitch bearing 30, reduce the number of maintenance and replacements, and thus reduce costs.

[0051] In some alternative embodiments, the clamping assembly 40 includes a limiting disc 41 and a plugging assembly 42. The limiting disc 41 presses against the bearing mounting portion 22 and is detachably connected to the bearing mounting portion 22 through the plugging assembly 42. The limiting disc 41 abuts against the outer surface of the outer ring 31 that is away from the receiving cavity 211 in the axial direction X. The periphery of the limiting disc 41 extends along the axial direction X and engages with the outer peripheral surface of the bearing mounting portion 22.

[0052] Optionally, the limiting plate 41 can be an annular plate structure, which is not easily deformed, avoids the generation of local stress, and makes each part of the limiting plate 41 bear force evenly.

[0053] The limiting plate 41 and the bearing mounting part 22 are detachably connected by the plug-in assembly 42, which helps to improve the connection strength between the limiting plate 41 and the bearing mounting part 22, thereby improving the connection strength between the pitch bearing 30 and the hub 20 clamped between the two. At the same time, it can better limit the pitch bearing 30 and prevent the pitch bearing 30 from undergoing axial X and radial Z displacement.

[0054] Meanwhile, the periphery of the limiting plate 41 extends along the axial direction X and engages with the outer peripheral surface of the bearing mounting part 22, which can further improve the connection strength between the limiting plate 41 and the bearing mounting part 22 and ensure safety.

[0055] By setting the plug-in assembly 42, a certain connection strength is ensured between the limiting disk 41 and the bearing mounting part 22 in the axial X direction. The locking fit between the outer circumferential surfaces of the limiting disk 41 and the bearing mounting part 22 in the axial X direction ensures a certain connection strength in the radial Z direction. Therefore, this arrangement better guarantees the connection strength between the pitch bearing 30 and the hub 20, helps prevent displacement of the pitch bearing 30 in both the axial X and radial Z directions, improves the service life and safety of the pitch bearing 30, and thus improves the service life and safety of the impeller assembly 100.

[0056] Optionally, the limiting plate 41 can be made as a single ring, or it can be provided separately in multiple parts.

[0057] Please see Figure 3 In some optional embodiments, the limiting disk 41 includes two or more connecting units 411 distributed circumferentially Y along the opening 212 and connected to each other, and the connecting units 411 have an arc-shaped structure.

[0058] Optionally, the number of connection units 411 can be set to two, or of course, it can be set to multiple.

[0059] The segmented structure of the limiting plate 41 allows each connecting unit 411 to be individually fitted and installed with the corresponding structure on the hub 20, reducing assembly difficulty. Furthermore, with the increasing size of wind turbine generators, the pitch bearing 30 is also becoming larger, consequently increasing the size of the limiting plate 41, leading to transportation difficulties. The segmented structure of the limiting plate 41 allows it to be stored or transported as two or more connecting units 411, reducing its volume during storage or transportation, minimizing storage space requirements, and reducing transportation difficulty. Moreover, during maintenance or replacement, only the worn sections need to be replaced, significantly reducing operating costs.

[0060] Optionally, two adjacent connecting units 411 can be connected using a male and female connector, secured by pins or bolts passing through the corresponding male and female connectors. For example, one end of one of the two adjacent connecting units 411 along the circumferential Y direction has a protruding structure, and the corresponding end of the other connecting unit 411 along the circumferential Y direction has a groove structure that matches the protrusion. Both the protruding and groove structures are provided with mounting holes for pin or bolt fixing. When adjacent connecting units 411 are connected and spliced, the protruding structure of one connecting unit 411 mates with the groove structure of the other connecting unit 411, and a pin is inserted into the mounting hole corresponding to the protruding and groove structures, or a bolt is screwed into the mounting hole corresponding to the protruding and groove structures, to achieve further tightening.

[0061] Furthermore, by providing the limit plate 41 separately in this way, the precision requirements for processing and manufacturing can be reduced, and the production efficiency can be improved.

[0062] For example, setting the number of connecting units 411 to 4 can improve transportation and assembly, and increase assembly efficiency and accuracy.

[0063] Please continue reading. Figure 2 and Figure 3 In some alternative embodiments, the plug-in assembly 42 includes a plurality of fasteners 421 that are inserted along the axial direction X into the limiting disc 41 and the hub 20 to connect the limiting disc 41 and the hub 20.

[0064] This configuration improves the connection strength between the limit plate 41 and the hub 20, thereby increasing the connection strength between the pitch bearing 30 and the hub 20, ensuring the safety and reliability of the impeller assembly 100, and extending its service life.

[0065] Optionally, the fastener 421 may include a bolt 4211, with a washer 4212 corresponding to each bolt 4211. When the fastener 421 is inserted into the limiting plate 41 and the hub 20 along the axial direction X, it helps to reduce stress concentration on the limiting plate 41 and at the same time extends the service life of the plug-in assembly 42.

[0066] Optionally, multiple fasteners 421 can be evenly distributed along the axial direction X on the limiting plate 41. Of course, multiple fasteners 421 can also be distributed in a certain regular pattern along the axial direction X on the limiting plate 41.

[0067] Optionally, the spacing between two adjacent fasteners 421 is equal; of course, it can also be unequal.

[0068] For example, each pair of fasteners 421 can be grouped together, with each group set at both ends of the connecting unit 411 in the circumferential Y direction. That is, each group of fasteners 421 is set at the position of adjacent two limiting discs 41 close to each other, which helps to improve the connection strength between the limiting disc 41 and the hub 20 and ensure the safety and reliability of the impeller assembly 100.

[0069] Please see Figure 1 and Figure 4 In some alternative embodiments, the limiting disc 41 protrudes along the radial Z direction on the side facing the hub 20 and forms a snap-fit ​​protrusion 412. The bearing mounting part 22 is provided with a slot 221 on the side facing the snap-fit ​​protrusion 412. The snap-fit ​​protrusion 412 extends into the slot 221 and snaps into the slot 221.

[0070] This configuration helps to improve the connection strength between the limit plate 41 and the hub 20, thereby improving the connection strength between the pitch bearing 30 and the hub 20, ensuring the safety and reliability of the impeller assembly 100, and extending its service life.

[0071] Optionally, the snap-fit ​​protrusion 412 and the snap-fit ​​groove 221 can be a clearance fit, so that there is a certain gap between the snap-fit ​​protrusion 412 and the groove wall of the snap-fit ​​groove 221, which facilitates disassembly and replacement. Of course, the snap-fit ​​protrusion 412 and the snap-fit ​​groove 221 can also be set to an interference fit, which helps to improve the connection strength.

[0072] Optionally, the snap-fit ​​protrusion 412 can be configured to include a first protrusion 4211 and a second protrusion 4212. The first protrusion 4211 extends axially (X-direction) towards the side facing the hub 20, and the second protrusion 4212 connects to the first protrusion 4211 and extends radially (Z-direction) towards the side facing the hub 20. The bearing mounting portion 22 has a slot 221 on the side facing the second protrusion 4212, and the second protrusion 4212 extends into and snaps into the slot 221, facilitating the assembly of the limiting disc 41 and the hub 20 and improving assembly efficiency. Of course, the above is only one embodiment of the snap-fit ​​protrusion 412 in this application, and this application is not limited to this.

[0073] Please see Figure 2 and Figure 5 In some alternative embodiments, along the radial direction Z of the opening 212, the base 21 at least partially protrudes from the inner surface of the bearing mounting portion 22 and forms a first boss 213, and the outer ring 31 abuts against the first boss 213 on the side opposite to the clamping assembly 40 in the axial direction X.

[0074] By setting the first boss 213, it is convenient to install and position the pitch bearing 30, thereby improving the assembly efficiency and accuracy between the pitch bearing 30 and the hub 20.

[0075] Furthermore, by having the outer ring 31 abut against the clamping assembly 40 and the first boss 213 on both sides in the axial direction X, the displacement of the pitch bearing 30 in the axial direction X can be limited. At the same time, the outer ring 31 abuts against the bearing mounting part 22 in the radial direction Z, which can limit the displacement of the pitch bearing 30 in the radial direction Z, thus ensuring the safety of the pitch bearing 30.

[0076] In some alternative embodiments, the impeller assembly 100 further includes a limiting member disposed on the first boss 213 along the axial direction X, wherein one of the limiting member and the outer ring 31 extends at least partially into the interior of the other.

[0077] By setting a limiting element on the first boss 213 to position the outer ring 31, the installation and positioning of the pitch bearing 30 is facilitated, so that the pitch bearing 30 is accurately installed on the bearing mounting part 22, avoiding misalignment and improving assembly efficiency and accuracy.

[0078] Furthermore, since one of the limiting member and the outer ring 31 extends at least partially into the interior of the other, it can also improve the connection strength between the pitch bearing 30 and the hub 20. At the same time, the limiting member can also provide a limiting function for the pitch bearing 30, preventing it from displacing in the circumferential Y direction and ensuring safety and reliability.

[0079] Optionally, the limiting member can be provided on the first boss 213 of the wheel hub 20, and the outer ring 31 can be provided with a limiting hole at the position corresponding to the limiting member of the first boss 213. During assembly, it is only necessary to ensure that the limiting member is aligned with the limiting hole and inserted. Of course, the limiting member can also be provided on the outer ring 31, and the first boss 213 is provided with a limiting hole corresponding to the limiting member on the outer ring 31.

[0080] Of course, the limiting components can also be provided separately, that is, inserted into the limiting holes corresponding to the outer ring 31 and the first boss 213 respectively.

[0081] Please continue reading. Figure 2 and Figure 5 In some optional embodiments, the limiting member includes two or more locating pins 50 extending along the axial direction X, and the outer ring 31 is provided with two or more locating holes, with each locating pin 50 inserted into one of the locating holes.

[0082] The embodiments of this application do not specifically limit the number of positioning pins 50 included in the limiting component. For example, the number of positioning pins 50 can be four. Of course, in some embodiments, the number of positioning pins 50 can also be three or five, as long as the limiting requirement of the pitch bearing 30 can be met.

[0083] Optionally, during installation, each locating pin 50 can be installed on the first boss 213 first, and then the locating holes on the outer ring 31 of the pitch bearing 30 can be set and inserted to correspond with the locating pins 50, which facilitates assembly and improves assembly efficiency and accuracy.

[0084] Setting the number of locating pins 50 to two or more can not only avoid the problem of incorrect correspondence or misalignment between the outer ring 31 and the first boss 213, thus improving assembly accuracy and efficiency, but also enhance the limiting effect of the outer ring 31 in the circumferential Y direction by inserting the locating pins 50 into the locating holes of the outer ring 31, preventing circumferential Y displacement of the outer ring 31 during installation or operation, and improving safety performance.

[0085] Optionally, the locating pin 50 may be one of a cylindrical pin, a diamond pin, etc., and this application does not limit this.

[0086] The limiting component adopts a structure of two or more locating pins 50 extending along the axial direction X. While providing a limiting function for the pitch bearing 30, it can also reduce the amount of machining required when setting the limiting component on the hub 20. It eliminates the need to machine the entire circumference of the first boss 213, saving time and reducing production costs.

[0087] Please see Figure 6 In some alternative embodiments, the impeller assembly 100 further includes a motor 61 and a drive wheel connected to the output end of the motor 61, the drive wheel meshing with the inner ring 32.

[0088] The inner ring 32 of the pitch bearing 30 typically has teeth. The drive wheel meshes with the gears in the inner ring 32, and the inner ring 32 rotates relative to the hub 20, thereby adjusting the pitch angle of the blades 10.

[0089] In order to change the pitch angle of the blade 10, not only is it necessary to provide the pitch bearing 30 for pitch control, but also to provide the motor 61 for pitch control drive, so as to realize the pitch operation of the blade 10, so that the wind turbine can obtain aerodynamic power and thus output power.

[0090] In some alternative embodiments, the impeller assembly 100 further includes a detector 71 and a trigger 72. The detector 71 is disposed on the inner ring 32 on the side radially opposite to the outer ring 31 and can rotate with the inner ring 32. The trigger 72 is connected to the hub 20 and can provide a trigger signal when the trigger 72 is aligned with the detector 71.

[0091] Optionally, the detector 71 is disposed on the inner ring 32 at a preset angle from the zero point position of the blade 10. The absolute value of the preset angle can be any value between 0° and 90°, greater than 0° and less than 90°, and can be any value between 5° and 60°, further selectable as 30° or 45°, depending on actual requirements. Similarly, the detector 71 can also be a sensor capable of mutually triggering the trigger 72, or it can be a stop structure that triggers the trigger 72. Alternatively, the detector 71 can also be disposed at the root of the blade 10.

[0092] For example, the number of detectors 71 can be set to 2, one of which is set at the zero point position of the inner ring 32 corresponding to the blade 10, and the other is set at the 90° position of the inner ring 32 corresponding to the blade 10.

[0093] Optionally, the trigger 72 is connected to the hub 20 and corresponds to the zero point position of the hub 20.

[0094] After the motor 61 operates and causes the blade 10 to pitch, when the trigger 72 aligns with the detector 71 and sends a feedback trigger signal, the motor 61 stops rotating and adjusts the rotation parameters, causing the detector 71 to rotate at a preset angle to achieve zero alignment of the blade 10, thereby ensuring the accuracy of the blade 10 angle and enabling the wind turbine generator set to have higher power generation efficiency.

[0095] Optionally, the impeller assembly 100 also includes a controller that can correct the rotational parameter information of the motor 61 based on the trigger signal fed back when the trigger 72 and the detector 71 are aligned, so as to ensure the accuracy of the blade 10 pitching.

[0096] With the above settings, the motor 61 of the wind turbine generator set can control the pitch of the blade 10 according to the predetermined control method of the wind turbine generator set, and ensure the accuracy of the pitch of the blade 10.

[0097] Please see Figure 7 This application also provides an impeller assembly method, including the following steps:

[0098] S100. A hub 20 is provided. The hub 20 includes a base 21 and a bearing mounting portion 22. The base 21 has a receiving cavity 211 and two or more openings 212 communicating with the receiving cavity 211. The wall portion of the base 21 that surrounds each opening 212 extends along the axial direction X of the opening 212 to form the bearing mounting portion 22.

[0099] S200, Heat the bearing mounting part 22 so that the bearing mounting part 22 is heated and deformed to a predetermined size;

[0100] S300, Place the pitch bearing 30 into the bearing mounting part 22. The pitch bearing 30 includes an inner ring 32 and an outer ring 31 that are rotatably fitted.

[0101] S400, cooling bearing mounting part 22, so that the axial X mounting part is cooled and shrinks and is interference-fitted with the outer ring 31;

[0102] S500, clamping components 40 are connected to the side of the bearing mounting part 22 away from the base 21, and the clamping components 40 at least partially abut against the outer surface of the outer ring 31 away from the receiving cavity 211 in the axial direction X.

[0103] S600, with blade 10 connected to the inner ring 32.

[0104] In step S100, the wall portion of the base 21 that encloses each opening 212 extends along the axial direction X of the opening 212 to form a bearing mounting portion 22, which facilitates the installation and positioning of the pitch bearing 30 and improves assembly efficiency.

[0105] In step S200, the bearing mounting part 22 is heated. Optionally, the bearing mounting part 22 can be heated by a heating device. The heating method can be electric heating, heat conduction heating, etc., which are not limited in this application.

[0106] The bearing mounting part 22 is heated and deformed to a predetermined size. Optionally, after the bearing mounting part 22 is heated, its inner wall near the opening 212 is displaced in the radial direction Z away from the opening 212, so that the size of the accommodating space in the mounting part in the radial direction Z increases, which is beneficial to placing the pitch bearing 30 into the bearing mounting part 22 during assembly.

[0107] In step S300, the pitch bearing 30 is placed into the bearing mounting portion 22 after heat deformation, with its outer ring 31 positioned close to the inner wall of the bearing mounting portion 22.

[0108] Optionally, in step S300, there may be a certain gap between the outer ring 31 and the inner wall of the bearing mounting portion 22, so that the pitch bearing 30 can be inserted into the bearing mounting portion 22 more quickly, improving assembly efficiency. Of course, there may also be no gap between the outer ring 31 and the inner wall of the bearing mounting portion 22, that is, when the pitch bearing 30 is inserted into the bearing mounting portion 22, the outer ring 31 slides against the inner wall of the bearing mounting portion 22, so that the pitch bearing 30 is inserted into the bearing mounting portion 22 more accurately, improving assembly precision.

[0109] In step S400, the bearing mounting section 22 is cooled. Optionally, a cooling device can be used to cool the bearing mounting section 22, which helps improve assembly efficiency. Of course, the bearing mounting section 22 can also be cooled down by letting it stand still, which helps reduce costs and simplify the operation process.

[0110] After the bearing mounting part 22 cools down, its inner wall moves in the radial Z direction towards the side facing the opening 212, so that the inner wall of the bearing mounting part 22 abuts against the outer ring 31 of the pitch bearing 30 and is interference-fitted with the outer ring 31, thereby improving the connection strength between the pitch bearing 30 and the bearing mounting part 22. In addition, the bearing mounting part 22 provides a radial Z force to the pitch bearing 30 to prevent the pitch bearing 30 from undergoing radial Z displacement and to ensure safety.

[0111] In step S500, the clamping assembly 40 is placed on the side of the bearing mounting portion 22 away from the base 21. The clamping assembly 40 abuts against the bearing mounting portion 22, and at least a portion of the clamping assembly 40 also abuts against the outer surface of the outer ring 31 away from the receiving cavity 211 in the axial X direction. That is, at least a portion of the pitch bearing 30 is clamped between the clamping assembly 40 and the bearing mounting portion 22 in the axial X direction. The clamping assembly 40 and the bearing mounting portion 22 work together to provide the pitch bearing 30 with an axial X clamping force to prevent the pitch bearing 30 from undergoing axial X displacement and to ensure safety.

[0112] In step S600, the blade 10 is connected to the inner ring 32 to complete the impeller assembly.

[0113] Optionally, a pitch bearing 30 can be installed in the bearing mounting part 22 of one of the openings 212 first, and then one blade 10 can be installed. After that, another blade 10 can be installed. Of course, multiple blades 10 can also be assembled at the same time. This application embodiment does not limit this.

[0114] In some alternative embodiments, the step S200 of heating the bearing mounting portion 22 to deform it to a predetermined size includes:

[0115] S210. Place an annular heating element on each bearing mounting part 22 corresponding to the hub 20, and the annular heating element abuts against the inner surface of the bearing mounting part 22.

[0116] S220. Power is supplied to the annular heating element to heat the bearing mounting part 22.

[0117] In step S210, the annular heating component is placed on the bearing mounting part 22 and abuts against the inner surface of the bearing mounting part 22, so that the heating component is in full contact with the bearing mounting part 22, which is conducive to heating the bearing mounting part 22. This allows each part of the bearing mounting part 22 to be deformed to a predetermined size by heat. At the same time, after each part of the bearing mounting part 22 is deformed, it is convenient to insert the pitch bearing 30, thereby improving assembly efficiency.

[0118] In step S220, the annular heating element is energized to heat the bearing mounting portion 22, which facilitates the deformation of the bearing mounting portion 22 due to heat, ensuring the effectiveness of the deformation of the bearing mounting portion 22. Of course, other methods can be used to heat the bearing mounting portion 22, as long as it is ensured that the bearing mounting portion 22 can deform due to heat, and this application does not limit this.

[0119] The impeller assembly method provided in this application embodiment utilizes an annular heating component to heat and deform the bearing mounting portion 22, then places the pitch bearing 30 into the bearing mounting portion 22. After the bearing mounting portion 22 cools, it forms an interference fit with the pitch bearing 30. A clamping component 40 is then provided to connect the pitch bearing 30 to the hub 20. This eliminates the need to provide a pitch bearing 30 race and holes in it, and to connect the pitch bearing 30 to the hub 20 using bolts. This method can reduce the size of the pitch bearing 20, while avoiding safety issues such as rust and fatigue damage caused by holes. It can extend the service life and reliability of the pitch bearing 30, reduce the frequency of maintenance and replacement, and thus reduce costs.

[0120] This application also provides a wind turbine generator set, including the rotor assembly 100 as described above.

[0121] This application also provides a wind turbine generator set, which includes an impeller assembly 100 as provided in the above embodiments, which has the performance of improving service life and reliability and reducing cost. Therefore, the service life and reliability of the wind turbine generator set can be improved, thereby reducing the cost of the wind turbine generator set.

[0122] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An impeller assembly (100) used in a wind turbine generator set, characterized in that, The impeller assembly (100) includes: Leaf (10); The hub (20) includes a base (21) and a bearing mounting portion (22). The base (21) has a receiving cavity (211) and two or more openings (212) communicating with the receiving cavity (211). The wall portion of the base (21) that surrounds each opening (212) extends along the axial direction (X) of the opening (212) to form the bearing mounting portion (22). A pitch bearing (30) is disposed inside each of the openings (212). The pitch bearing (30) includes a rotating outer ring (31) and an inner ring (32). The outer ring (31) is disposed inside the bearing mounting part (22) and is interference-fitted with the bearing mounting part (22). The inner ring (32) is connected to the blade (10). A clamping assembly (40) is connected to the side of each of the bearing mounting portions (22) away from the base (21). The clamping assembly (40) at least partially abuts against the outer surface of the outer ring (31) away from the receiving cavity (211) in the axial direction (X). At least a portion of the pitch bearing (30) is clamped between the clamping assembly (40) and the bearing mounting portion (22) in the axial direction (X).

2. The impeller assembly (100) according to claim 1, characterized in that, The clamping assembly (40) includes a limiting disc (41) and a plug-in assembly (42). The limiting disc (41) presses against the bearing mounting part (22) and is detachably connected to the bearing mounting part (22) through the plug-in assembly (42). The limiting disc (41) abuts against the outer surface of the outer ring (31) in the axial direction (X) away from the outer surface of the receiving cavity (211). The periphery of the limiting disc (41) extends along the axial direction (X) and engages with the outer peripheral surface of the bearing mounting part (22).

3. The impeller assembly (100) according to claim 2, characterized in that, The limiting disk (41) includes two or more connecting units (411) distributed circumferentially (Y) along the opening (212) and connected to each other, and the connecting unit (411) has an arc-shaped structure.

4. The impeller assembly (100) according to claim 2, characterized in that, The plug-in assembly (42) includes a plurality of fasteners (421) that are inserted along the axial direction (X) into the limiting plate (41) and the hub (20) to connect the limiting plate (41) and the hub (20).

5. The impeller assembly (100) according to claim 2, characterized in that, The limiting plate (41) protrudes radially (Z) toward the side facing the hub (20) and forms a snap-fit ​​protrusion (412). The bearing mounting part (22) has a slot (221) on the side facing the snap-fit ​​protrusion (412). The snap-fit ​​protrusion (412) extends into the slot (221) and snaps into the slot (221).

6. The impeller assembly (100) according to any one of claims 1 to 5, characterized in that, Along the radial (Z) direction of the opening (212), the base (21) protrudes at least partially from the inner surface of the bearing mounting portion (22) and forms a first boss (213), and the outer ring (31) abuts against the first boss (213) on the side opposite to the clamping assembly (40) in the axial (X) direction.

7. The impeller assembly (100) according to claim 6, characterized in that, The impeller assembly (100) also includes a limiting member disposed on the first boss (213) along the axial direction (X), wherein the limiting member and the outer ring (31) extend at least partially into the interior of the other.

8. The impeller assembly (100) according to claim 7, characterized in that, The limiting member includes two or more positioning pins (50) extending along the axial direction (X), and the outer ring (31) is provided with two or more positioning holes, each of the positioning pins (50) being inserted into one of the positioning holes.

9. The impeller assembly (100) according to claim 6, characterized in that, The impeller assembly (100) also includes a motor (61) and a drive wheel connected to the output end of the motor (61), the drive wheel meshing with the inner ring (32).

10. The impeller assembly (100) according to claim 6, characterized in that, The impeller assembly (100) also includes a detector (71) and a trigger (72). The detector (71) is located on the inner ring (32) on the side of the outer ring (31) in the radial (Z) direction and can rotate with the inner ring (32). The trigger (72) is connected to the hub (20) and can provide a trigger signal when the trigger (72) is aligned with the detector (71).

11. A method for assembling an impeller, characterized in that, include: A hub (20) is provided, the hub (20) including a base (21) and a bearing mounting portion (22), the base (21) having a receiving cavity (211) and two or more openings (212) communicating with the receiving cavity (211), the wall portion of the base (21) enclosing each opening (212) extending along the axial direction (X) of the opening (212) to form the bearing mounting portion (22); The bearing mounting portion (22) is heated so that it deforms to a predetermined size. The pitch bearing (30) is placed in the bearing mounting part (22), the pitch bearing (30) including an inner ring (32) and an outer ring (31) that are rotatably engaged. The bearing mounting portion (22) is cooled so that the axial (X) mounting portion cools and shrinks and is interference-fitted with the outer ring (31); A clamping assembly (40) is connected to the side of the bearing mounting part (22) away from the base (21), and the clamping assembly (40) at least partially abuts against the outer surface of the outer ring (31) away from the receiving cavity (211) in the axial direction (X); The blade (10) is connected to the inner ring (32).

12. The impeller assembly method according to claim 11, characterized in that, The step of heating the bearing mounting portion (22) to deform it to a predetermined size includes: An annular heating element is placed on the hub (20) corresponding to each of the bearing mounting portions (22), and the annular heating element abuts against the inner surface of the bearing mounting portion (22); The annular heating element is energized to heat the bearing mounting portion (22).

13. A wind turbine generator set, characterized in that, Includes the impeller assembly (100) as described in any one of claims 1 to 10.

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