Blade, wind turbine generator unit, and coupling

Abstract

This application relates to a blade, a wind turbine generator set, and a connector. The blade includes: a blade body comprising a first blade segment and a second blade segment distributed along its own axial direction, the first blade segment being used to connect to a hub; and a connector disposed between the first blade segment and the second blade segment, the connector including a first connecting section, a second connecting section, and a transmission component. One of the first connecting section and the second connecting section is partially inserted into the interior of the other, and the transmission component is at least partially located between the first connecting section and the second connecting section. The first connecting section and the second connecting section are rotatably engaged with each other through the transmission component. The end of the first connecting section opposite to the second connecting section is connected to the first blade segment, and the end of the second connecting section opposite to the first connecting section is connected to the second blade segment. The blade of this application can meet the power conversion requirements of wind turbine generator sets, and has lower manufacturing costs and transportation difficulties.

Description

Technical Field

[0001] This application relates to the field of wind power technology, and in particular to a blade, a wind turbine generator set and a connector. Background Technology

[0002] Existing wind turbines mostly use integral blades, connected to the hub via pitch bearings to achieve pitch control. As the level of wind turbines increases, the required hub size also increases. If integral blades are used, the size of the end connecting the blade and the hub needs to be increased, requiring a complete redesign and installation of the blade, as well as matching a pitch bearing of the appropriate size, thus increasing the cost of the blade and the wind turbine used.

[0003] Therefore, there is an urgent need for a new type of blade, wind turbine generator set, and connector. Summary of the Invention

[0004] This application provides a blade, a wind turbine generator set, and a connector. The blade can meet the power conversion requirements of the wind turbine generator set and has a low cost.

[0005] On one hand, according to an embodiment of this application, a blade is provided, comprising: a blade body including a first blade segment and a second blade segment distributed along its own axial direction, the first blade segment being used to connect with a hub; a connector disposed between the first blade segment and the second blade segment, the connector including a first connecting section, a second connecting section, and a transmission component, one of the first connecting section and the second connecting section being partially inserted into the interior of the other, the transmission component being at least partially located between the first connecting section and the second connecting section, the first connecting section and the second connecting section being rotatably engaged with each other through the transmission component, the end of the first connecting section opposite to the second connecting section being connected to the first blade segment, and the end of the second connecting section opposite to the first connecting section being connected to the second blade segment.

[0006] According to one aspect of the embodiments of this application, the transmission component includes a pitch bearing and a drive component, wherein one of the inner ring and the outer ring of the pitch bearing is connected to a first connecting section and the other is connected to a second connecting section, and the drive component is capable of driving the inner ring and the outer ring to rotate relative to each other.

[0007] According to one aspect of the embodiments of this application, the transmission component includes two or more pitch bearings, which are distributed axially, and at least one pitch bearing is provided with a corresponding drive component.

[0008] According to one aspect of the embodiments of this application, the driving component includes a motor and a driving wheel connected to the output end of the motor, and the driving component drives the inner ring and the outer ring to rotate relative to each other through the driving wheel.

[0009] According to one aspect of the embodiments of this application, the drive component includes two or more telescopic cylinders distributed circumferentially along the pitch bearing, the cylinder body of each telescopic cylinder being connected to one of the inner ring and the outer ring, and the cylinder rod of each telescopic cylinder being connected to the other of the inner ring and the outer ring.

[0010] According to one aspect of the embodiments of this application, the first connecting segment is detachably connected to the first leaf segment, and the second connecting segment is detachably connected to the second leaf segment.

[0011] According to one aspect of the embodiments of this application, a first connecting segment is provided with a plurality of first connecting holes, a first leaf segment is provided with a plurality of second connecting holes, each first connecting hole is opposite to a second connecting hole and is detachably connected by a first fastener; a second connecting segment is provided with a plurality of third connecting holes, a second leaf segment is provided with a plurality of fourth connecting holes, each third connecting hole is opposite to a fourth connecting hole and is detachably connected by a second fastener.

[0012] According to one aspect of the embodiments of this application, the blade further includes a threaded sleeve, a threaded sleeve is embedded in a second connecting hole, a first fastener is threadedly connected to the threaded sleeve located in the second connecting hole, and / or, a threaded sleeve is embedded in a fourth connecting hole, and a second fastener is threadedly connected to the threaded sleeve located in the fourth connecting hole.

[0013] According to one aspect of the embodiments of this application, the first connecting segment and the second connecting segment are respectively cylindrical.

[0014] According to one aspect of the embodiments of this application, the first connecting segment includes a first cylindrical body and a first adapter ring. The first adapter ring is connected to one end of the first cylindrical body that is axially opposite to the second connecting segment and is disposed around the first cylindrical body. The first adapter ring protrudes radially from the first cylindrical body and is disposed in the first adapter ring and extends axially.

[0015] According to one aspect of the embodiments of this application, the second connecting section includes a second cylinder and a second adapter ring, the second adapter ring being connected to one end of the second cylinder that is axially away from the first connecting section, and a third connecting hole being disposed on the second adapter ring and extending axially.

[0016] According to one aspect of the embodiments of this application, the first connecting section further includes a first mounting ring, which is axially disposed opposite to the first adapter ring at both ends of the first cylinder, the first adapter ring extending into the interior of the first cylinder, and the driving component connected to the first mounting ring.

[0017] According to one aspect of the embodiments of this application, the second connecting section further includes a second mounting ring, the second mounting ring and the second transition ring are located on the same side of the second cylinder in the axial direction, the second transition ring is provided to protrude from the second cylinder in the axial direction, the second mounting ring is provided to protrude into the interior of the second cylinder, and the second mounting ring is in transmission cooperation with the driving component.

[0018] According to one aspect of the embodiments of this application, the first leaf segment includes a columnar base and an airfoil portion, the airfoil portion being connected to the outer peripheral surface of the base, the base being connected to a first connecting segment, and the base having a plurality of axially extending fixing holes on the side opposite to the first connecting segment in the axial direction, the fixing holes being used for connection with a wheel hub.

[0019] According to one aspect of the embodiments of this application, the cross-section of the substrate in the axial direction is circular or elliptical.

[0020] According to one aspect of the embodiments of this application, the airfoil is a hollow or solid plate-like structure, and the thickness of the airfoil gradually decreases along the direction intersecting the axial direction and starting from the base away from the base.

[0021] According to one aspect of the embodiments of this application, in the axial direction, the value of the depth L in which one of the first connecting segment and the second connecting segment is inserted into the other is in the range of 0.1D≤L≤2D, where D is the outer diameter of the matrix away from the end of the second leaf segment.

[0022] According to one aspect of the embodiments of this application, a first leaf segment and a second leaf segment are spaced apart and form a gap at their axially facing ends, a connector is at least partially exposed in the gap, and the leaf also includes a protective shell, the protective shell covers at least a portion of the connector and closes the gap, one axially overlapping and fixedly connected to one of the first leaf segment and the second leaf segment, and the other axially overlapping and rotatably engaging with the other of the first leaf segment and the second leaf segment.

[0023] In another aspect, according to an embodiment of this application, a wind turbine generator set is provided, including: a hub; the aforementioned blades, wherein the blades are connected to the hub via a first blade segment.

[0024] In another aspect, according to an embodiment of this application, a connector is provided for a blade, the blade including a blade body, the blade body including a first blade segment and a second blade segment distributed along its own axial direction, characterized in that the connector includes: a first connecting section for connecting with the first blade segment; a second connecting section for connecting with the second blade segment, one of the first connecting section and the second connecting section being partially inserted into the interior of the other; and a transmission component, at least partially disposed between the first connecting section and the second connecting section, the first connecting section and the second connecting section being rotatably engaged by the transmission component.

[0025] According to the embodiments of this application, the blade, wind turbine generator set, and connector include a blade body and a connector. The blade body includes a first blade segment and a second blade segment distributed along its own axial direction. The first blade segment can be connected to the hub. The connector can connect to the first blade segment through a first connecting section and to the second blade segment through a second connecting section. By making the blade body a separate unit, it is beneficial to manufacture and transport the blade body. Furthermore, since the first blade segment is connected to the hub, when the size of the hub changes, only the first blade segment that is adapted can be selected to connect to the hub, without the need to adjust the second blade segment. In other words, the modular design of the second blade segment can be realized, reducing design costs. At the same time, since the first connecting section and the second connecting section rotate with each other through a transmission component, the first connecting section and the second connecting section can rotate relative to each other, which can realize the pitch requirements of the blade. There is no need to set a pitch bearing with matching size between the first connecting section and the hub, which effectively reduces the cost of the blade and the wind turbine generator set to which it is applied. Attached Figure Description

[0026] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of a wind turbine generator set according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the overall structure of a blade according to an embodiment of this application;

[0029] Figure 3 This is a partial structural schematic diagram of a blade according to an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the structure of a connector according to an embodiment of this application;

[0031] Figure 5 This is a side view of a connector according to another embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the structure of the first leaf segment according to an embodiment of this application;

[0033] Figure 7 This is a partial structural schematic diagram of a blade according to another embodiment of this application.

[0034] in:

[0035] 1-Leaf;

[0036] 10-Blade body;

[0037] 11-First leaf segment; 111-Leaf root; 112-Second connecting hole; 113-Fixing hole; 11a-Base; 11b-Airfoil section;

[0038] 12-Second leaf segment; 121-Leaf tip; 122-Fourth connecting pore;

[0039] 20-Connector; 21-First connecting section; 211-First cylinder; 212-First adapter ring; 213-First mounting ring; 214-First connecting hole; 215-Weight reduction cavity;

[0040] 22-Second connecting section; 221-Second cylinder; 222-Second adapter ring; 223-Second mounting ring; 224-Third connecting hole;

[0041] 23-Transmission components; 231-Pitch bearing; 232-Drive components; 2321-Motor; 2322-Drive wheel; 2323-Telescopic cylinder;

[0042] 30 - Screw insert; 40 - Clearance; 50 - Protective shell; 60 - First fastener; 70 - Second fastener;

[0043] 2-Hub; 100-Impeller; 200-Generator; 300-Nacelle; 400-Tower; X-Axial axis.

[0044] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0045] 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.

[0046] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the blades, wind turbine generator sets, and couplings of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] Please see Figure 1 This application provides a wind turbine generator set, including a tower 400, a nacelle 300, a generator 200, and an impeller 100. The impeller 100 includes a hub 2 and blades 1. The tower 400 is connected to a wind turbine foundation, and the nacelle 300 is disposed at the top of the tower 400. The nacelle 300 includes a base and can be connected to the tower 400 via the base. The generator 200 is disposed in the nacelle 300. In some examples, the generator 200 can be located outside the nacelle 300; in other examples, the generator 200 can be located inside the nacelle 300. The number of blades 1 can be multiple and spaced around the axis of the hub 2. For example, the number of blades 1 can be three. The generator 200 includes a rotor and a stator that are rotatably coupled. The rotor can be connected to the hub 2, and the stator can be connected to the base of the nacelle 300. When wind force acts on blade 1, blade 1 drives hub 2 to rotate, which in turn drives the rotor of generator 200 to rotate relative to the stator, thus meeting the power generation needs of the wind turbine generator set.

[0048] Existing wind turbines mostly use integral blades, which are connected to the hub via pitch bearings. As the level of wind turbines increases, the size of their hubs also becomes longer. If integral blades are used, the size of the end where the blade connects to the hub needs to be increased. This requires the entire blade to be redesigned and reinstalled, and a pitch bearing of the appropriate size needs to be matched, which increases the cost of the blade and the wind turbine used. In addition, the length of integral blades is relatively large, which is not conducive to transportation.

[0049] Please see Figures 2 to 4 Based on the above-mentioned technical problems, this application provides a new blade 1, including a blade body 10. The blade body 10 includes a first blade segment 11 and a second blade segment 12 distributed along its own axial direction X. The first blade segment 11 is used to connect with the hub 2.

[0050] Optionally, the first leaf segment 11 of the leaf body 10 may include a leaf root 111, and the second leaf segment 12 may include a leaf tip 121.

[0051] Optionally, the length of the first leaf segment 11 may be less than the length of the second leaf segment 12. The first leaf segment 11 may be connected to the hub 2 through its leaf root 111, or optionally, it may be directly connected by bolts.

[0052] In order to meet the connection requirements between the first leaf segment 11 and the second leaf segment 12, this application embodiment also provides a connector 20. The connector 20 can be manufactured and sold separately as an independent product. Of course, it can also be used in the blade 1 provided in the above embodiment and as a component of the blade 1.

[0053] Continue reading Figures 2 to 4 As shown, optionally, the connector 20 provided in this embodiment can be disposed between the first blade segment 11 and the second blade segment 12. The connector 20 includes a first connecting segment 21, a second connecting segment 22, and a transmission component 23. One of the first connecting segment 21 and the second connecting segment 22 is partially inserted into the interior of the other. The transmission component 23 is at least partially located between the first connecting segment 21 and the second connecting segment 22. The first connecting segment 21 and the second connecting segment 22 are rotatably engaged with each other through the transmission component 23. When used in the blade 1 and engaged with the blade body 10, the end of the first connecting segment 21 facing away from the second connecting segment 22 is connected to the first blade segment 11, and the end of the second connecting segment 22 facing away from the first connecting segment 21 is connected to the second blade segment 12.

[0054] Optionally, both the first connecting segment 21 and the second connecting segment 22 can be cylindrical. This is one possible example. In some examples, one of the first connecting segment 21 and the second connecting segment 22 is a cylindrical part and the other can be a shaft-like part.

[0055] Optionally, when the connector 20 is used for the blade 1 and cooperates with the blade body 10, the end of the first connecting section 21 facing away from the second connecting section 22 can be detachably connected to the first blade segment 11. The first connecting section 21 can extend into the interior of the first blade segment 11, or it can be sleeved on the outside of the first blade segment 11. Alternatively, the first connecting section 21 and the first blade segment 11 can be directly connected at the ends facing each other, as long as the connection requirements with the first blade segment 11 can be met.

[0056] Optionally, when the connector 20 is used for the blade 1 and cooperates with the blade body 10, the end of the second connecting section 22 facing away from the first connecting section 21 can be detachably connected to the second blade segment 12. The second connecting section 22 can extend into the interior of the second blade segment 12, or it can be sleeved on the exterior of the second blade segment 12. Alternatively, the second connecting section 22 and the second blade segment 12 can be directly connected at the ends facing each other, as long as the connection requirements with the second blade segment 12 can be met.

[0057] Optionally, the first connecting segment 21 and the second connecting segment 22 have their ends facing each other, with one segment inserted into the interior of the other. This can be achieved by inserting the first connecting segment 21 into the interior of the second connecting segment 22, or vice versa. The depth to which one of the first connecting segment 21 and the second connecting segment 22 is inserted into the other can be set according to the size and number of the transmission components 23.

[0058] Optionally, an annular spacer cavity can be formed between the outer wall surface of one of the first connecting segment 21 and the inner wall surface of the other, and the transmission component 23 can be located in the annular spacer cavity and sleeved on one of the first connecting segment 21 and the second connecting segment 22.

[0059] Optionally, the first connecting section 21 and the second connecting section 22 can rotate about the axis of the blade body 10, with one rotating relative to the other, thereby driving the first blade segment 11 and the second blade segment 12 to rotate relative to each other, thus realizing the pitch of the blade 1.

[0060] The blade 1 provided in this embodiment includes a blade body 10 and a connector 20. The blade body 10 includes a first blade segment 11 and a second blade segment 12 distributed along its own axial direction X. The first blade segment 11 can be used to connect with the hub 2. The connector 20 can be connected to the first blade segment 11 through a first connecting section 21 and to the second blade segment 12 through a second connecting section 22. By making the blade body 10 split, it is beneficial to manufacture and transport the blade body 10.

[0061] Furthermore, the first blade segment 11 is connected to the hub 2. When the size of the hub 2 changes, a suitable first blade segment 11 can be selected and connected to the hub 2 without adjusting the second blade segment 12. In other words, the second blade segment 12 can be modularly designed, reducing design costs. Simultaneously, since the first connecting segment 21 and the second connecting segment 22 rotate relative to each other through the transmission component 23, the pitch requirements of the blade can be met. A pitch bearing 231 of matching size is no longer needed between the first connecting segment 21 and the hub 2, effectively reducing the cost of the blade and the wind turbine generator set it is used in.

[0062] As an alternative implementation, the transmission component 23 includes a pitch bearing 231 and a drive component 232. One of the inner ring and the outer ring of the pitch bearing 231 is connected to the first connecting section 21 and the other is connected to the second connecting section 22. The drive component 232 is capable of driving the inner ring and the outer ring to rotate relative to each other.

[0063] Optionally, the pitch bearing 231 can be sleeved on one of the first connecting section 21 and the second connecting section 22 and clamped between the first connecting section 21 and the second connecting section 22.

[0064] Optionally, the drive component 232 can be located outside the first connecting section 21 and the second connecting section 22. Of course, in some examples, the drive component 232 can also be located inside the first connecting section 21 and the second connecting section 22. The drive component 232 can cooperate with one of the inner ring and the outer ring to drive the inner ring and the outer ring to rotate relative to each other. Of course, in some examples, the drive component 232 can also cooperate with one of the first connecting section 21 and the second connecting section 22 to drive the inner ring and the outer ring to rotate relative to each other through the first connecting section 21 and the second connecting section 22, thereby causing the first blade segment 11 connected to the first connecting section 21 to rotate relative to the second blade segment 12 connected to the second connecting section 22, thus realizing the pitch requirement of the blade 1.

[0065] For example, the drive component 232 can cooperate with the first connecting segment 21 and drive the first connecting segment 21 to rotate relative to the second connecting segment 22. Of course, in some examples, the drive component 232 can also cooperate with the second connecting segment 22 and drive the second connecting segment 22 to rotate relative to the first connecting segment 21.

[0066] The blade provided in this embodiment of the application, by having the transmission component 23 include a pitch bearing 231 and a drive component 232, and the first connecting section 21 and the second connecting section 22 are rotatably connected by the pitch bearing 231, and the drive component 232 drives the inner and outer rings of the pitch bearing 231 to rotate relative to each other, so that the first connecting section 21 and the second connecting section 22 can rotate relative to each other, thereby driving the first blade segment 11 to rotate relative to the second blade segment 12, which can satisfy the pitch requirement of the blade 1. At the same time, the above-described form of the transmission component 23 has a simple structure and is conducive to the forming of the blade 1.

[0067] As an optional implementation, the transmission component 23 may include one pitch bearing 231, or more than two. When there are more than two, the two or more pitch bearings 231 are distributed along the axial direction X of the blade body 10, which can also be understood as being distributed along the axial direction of the first connecting section 21 and the second connecting section 22. At least one pitch bearing 231 is correspondingly provided with a drive component 232.

[0068] Optionally, the number of pitch bearings 231 can be two, three or more, and the two or more pitch bearings 231 can be distributed at intervals along the axial direction X of the blade body 10.

[0069] For example, the number of pitch bearings 231 can be two, with the inner ring of each pitch bearing 231 being connected to the first connecting section 21 and the outer ring being connected to the second connecting section 22.

[0070] The blade 1 provided in this application embodiment enables multi-point rotational connection between the first connecting section 21 and the second connecting section 22 by having two or more pitch bearings 231 included in the transmission component 23 and distributed along the axial direction X. In addition to meeting the requirement of rotational connection between the first connecting section 21 and the second connecting section 22, it can also ensure the smooth performance of the connection and rotation between the two.

[0071] As an optional implementation, the blade 1 provided in this application embodiment includes a driving component 232 comprising a motor 2321 and a driving wheel 2322 connected to the output end of the motor 2321. The driving component 232 drives the inner ring to rotate relative to the outer ring through the driving wheel 2322.

[0072] Optionally, the drive wheel 2322 can be a pulley, or it can be a gear, with the option of a gear being preferred.

[0073] Optionally, the drive wheel 2322 can directly mesh with the inner or outer ring for transmission. Of course, this is an optional embodiment. In some examples, the drive wheel 2322 can mesh with one of the first connecting section 21 and the second connecting section 22 for transmission.

[0074] For example, the first connecting segment 21 can be inserted into the interior of the second connecting segment 22, the inner ring of the pitch bearing 231 is connected to the first connecting segment 21, the outer ring of the pitch bearing 231 is connected to the second connecting segment 22, and the motor 2321 can be connected to the first connecting segment 21 and mesh with the second connecting segment 22 for transmission. The kinetic energy of the motor 2321 is transmitted to the second connecting segment 22 through the drive wheel 2322, so that the second connecting segment 22 drives the outer ring of the pitch bearing 231 to rotate relative to the inner ring, ensuring that the second blade segment 12 rotates relative to the first blade segment 11, thus meeting the pitch requirements.

[0075] The blade provided in this application embodiment has a drive component 232 with the above-described structure, which not only ensures the rotation requirements of the first connecting section 21 and the second connecting section 22, but also enables the first connecting section 21 and the second connecting section 22 to self-lock at the predetermined position after rotating to the predetermined position.

[0076] It is understood that the blades provided in the embodiments of this application, the drive component 232 is not limited to including the motor 2321 and the drive wheel 2322.

[0077] Please see Figure 5In some embodiments, the drive component 232 may include two or more telescopic cylinders 2323. The cylinder body of each telescopic cylinder 2323 is connected to one of the inner and outer rings of the pitch bearing 231, and the cylinder rod of each telescopic cylinder 2323 is connected to the other of the inner and outer rings. The cylinder body of the telescopic cylinder 2323 can be directly connected to one of the inner and outer rings, or indirectly connected through the first connecting section 21 or the second connecting section 22. Similarly, the cylinder rod of the telescopic cylinder 2323 can be directly connected to the other of the inner and outer rings, or indirectly connected through the first connecting section 21 or the second connecting section 22, as long as the driving requirements for relative rotation of the inner and outer rings can be met.

[0078] Continue reading Figures 2 to 5 As shown, in one optional implementation, the first connecting segment 21 and the second connecting segment 22 can be cylindrical bodies.

[0079] Optionally, the first connecting segment 21 and the second connecting segment 22 are coaxially arranged. This ensures their coaxiality and thus guarantees their smooth performance during relative rotation.

[0080] Optionally, the first connecting segment 21 and the second connecting segment 22 may be cylindrical structures.

[0081] Optionally, the outermost connecting segment 21 and the second connecting segment 22 with the larger radial dimension can have a weight-reducing cavity 215, which can reduce the overall weight of the connector 20 and reduce costs.

[0082] As an optional implementation, the first connecting segment 21 is detachably connected to the first leaf segment 11, and the second connecting segment 22 is detachably connected to the second leaf segment 12.

[0083] The above configuration facilitates the separate manufacturing of the first leaf segment 11, the connector 20, and the second leaf segment 12, while also enabling each of the three to be transported separately, which is beneficial for molding and transportation.

[0084] As an optional implementation, the blade 1 provided in this application embodiment has a first connecting segment 21 provided with a plurality of first connecting holes 214, and a first blade segment 11 provided with a plurality of second connecting holes 112. Each first connecting hole 214 is opposite to a second connecting hole 112 and is detachably connected by a first fastener 60. The second connecting segment 22 is provided with a plurality of third connecting holes 224, and the second blade segment 12 is provided with a plurality of fourth connecting holes 122. Each third connecting hole 224 is opposite to a fourth connecting hole 122 and is detachably connected by a second fastener 70.

[0085] Optionally, a plurality of first connecting holes 214 may be spaced apart and evenly distributed in the circumferential direction of the first connecting segment 21, and a plurality of third connecting holes 224 may be spaced apart and evenly distributed in the circumferential direction of the second connecting segment 22.

[0086] The blade 1, the first connecting segment 21, and the first blade segment 11 provided in this application embodiment are connected to each other by a first fastener 60, which ensures both the detachable connection requirement and the connection strength. Correspondingly, the second connecting segment 22 and the second blade segment 12 are connected to each other by a second fastener 70, which also ensures both the detachable connection requirement and the connection strength.

[0087] As an optional implementation, the first connecting segment 21 may include a first cylindrical body 211 and a first adapter ring 212. The first adapter ring 212 is connected to the end of the first cylindrical body 211 that is axially opposite to the second connecting segment 22 and is disposed around the first cylindrical body 211. The first adapter ring 212 protrudes radially from the first cylindrical body 211 and is connected to the first cylindrical body 211. A first connecting hole 214 is disposed on the first adapter ring 212. Both the first connecting hole 214 and the second connecting hole 212 extend along the axial direction X of the blade 1. The first adapter ring 212 and the first blade segment 11 are axially mated together and detachably connected to each other by a first fastener 60.

[0088] In an optional implementation, the second connecting section 22 may include a second cylindrical body 221 and a second transition ring 222. The second transition ring 222 is connected to one end of the second cylindrical body 221 that is axially opposite to the second connecting section 22. The second transition ring 222 protrudes from the second cylindrical body 221 axially along the blade 1. A third connecting hole 224 is provided on the second transition ring 222. Both the third connecting hole 224 and the fourth connecting hole 122 extend axially along the blade 1. The second transition ring 222 and the second blade segment 12 are axially abutted against each other and detachably connected to each other by a second fastener 70.

[0089] The blade 1 provided in this application embodiment, with the first connecting segment 21 and the second connecting segment 22 adopting the above-described form and their respective connection relationships with the corresponding first leaf segment 11 and second leaf segment 12, can ensure the connection requirements between the first connecting segment 21 and the first leaf segment 11 and between the second connecting segment 22 and the second leaf segment 12.

[0090] Optionally, the first connecting segment 21 and the second connecting segment 22 may extend at least partially synchronously into the interior of one of the first leaf segment 11 and the second leaf segment 12 to reduce the mating gap between the first leaf segment 11 and the second leaf segment 12.

[0091] As an optional implementation, in order to facilitate the installation of the drive component 232, the first connecting section 21 of the blade of the present application embodiment further includes a first mounting ring 213. The first mounting ring 213 is disposed opposite to the first transition ring 212 at both ends of the first cylinder 211 in the axial direction X. The first transition ring 212 extends into the interior of the first cylinder 211, and the drive component 232 is connected to the first mounting ring 213.

[0092] By setting the first mounting ring 213, the installation of the drive component 232 can be facilitated, and the rotational connection requirements between the first connecting section 21 and the second connecting section 22 can be met.

[0093] As an optional implementation, the blade 1 provided in this application embodiment further includes a second mounting ring 223 in the second connecting section 22 of the connector 20. The second mounting ring 223 and the second transition ring 222 are located on the same side of the second cylinder 221 in the axial direction X and extend in different directions. The second transition ring 222 protrudes from the second cylinder 221 in the axial direction X, and the second mounting ring 223 protrudes into the interior of the second cylinder 221. The second mounting ring 223 is in a transmission cooperation with the drive component 232, for example, meshing transmission, to obtain the power output by the drive component 232 and realize the relative rotation requirement of the second connecting section 22 and the first connecting section 21.

[0094] As an alternative implementation, the blade 1 also includes a threaded sleeve 30, which is embedded in the second connecting hole 112, and the first fastener 60 is threadedly connected to the threaded sleeve 30 located in the second connecting hole 112.

[0095] In other words, a threaded sleeve 30 can be provided on the first leaf segment 11. The threaded sleeve 30 cooperates with the first fastener 60 to meet the connection requirements with the first connecting section 21. At the same time, the threaded sleeve 30 can also protect the first leaf segment 11, preventing damage to the first leaf segment 11 caused by wear of the hole wall of the second connecting hole 112 formed by the first fastener 60 and the first leaf segment 11. When the threaded sleeve 30 is damaged, only the threaded sleeve 30 in the corresponding position needs to be replaced, which can improve the service life of the first leaf segment 11.

[0096] As an alternative implementation, a threaded sleeve 30 is embedded in the fourth connecting hole 122, and the second fastener 70 is threadedly connected to the threaded sleeve 30 located in the fourth connecting hole 122.

[0097] In other words, a threaded sleeve 30 can be installed on the second leaf segment 12. The threaded sleeve 30 cooperates with the second fastener 70 to meet the connection requirements with the second connecting section 22. At the same time, the threaded sleeve 30 can also protect the second leaf segment 12, preventing damage to the second leaf segment 12 caused by wear of the hole wall of the fourth connecting hole 122 formed by the second fastener 70 and the second leaf segment 12. When the threaded sleeve 30 is damaged, only the threaded sleeve 30 in the corresponding position needs to be replaced, which can improve the service life of the second leaf segment 12.

[0098] Please see Figure 6 As an optional implementation, the blade provided in this application embodiment includes a first blade segment 11 comprising a columnar base 11a and an airfoil portion 11b. The airfoil portion 11b is connected to the outer peripheral surface of the base 11a. The base 11a is connected to the first connecting segment 21. The base 11a has a plurality of fixing holes 113 extending along the axial direction X on the side opposite to the first connecting segment 21. The fixing holes 113 are used to connect with the hub 2.

[0099] Optionally, when the first connecting segment 21 includes a first adapter ring 212, the shape of the first adapter ring 212 can match the shape of the base 11a and be mated with each other.

[0100] The blade provided in this embodiment adopts the above-described structure in its first blade segment 11. The shape of the airfoil 11b can be set according to the aerodynamic performance requirements of the blade, which is beneficial for the blade to meet aerodynamic requirements. At the same time, the base 11a facilitates the connection between the blade and the hub 2 and the first connecting section 21.

[0101] As an alternative implementation, the cross-section of the base 11a in the axial direction X is circular or elliptical. This arrangement facilitates the connection with the hub 2 while also allowing the blades 1 to meet their aerodynamic performance requirements.

[0102] As an alternative implementation, the airfoil 11b is a hollow or solid plate-like structure, and its thickness gradually decreases along the direction intersecting the axial direction and starting from the base away from the base. This form of the airfoil 11b facilitates airflow and improves wind energy conversion efficiency.

[0103] Optionally, the columnar base 11a and the airfoil 11b can be set separately and then connected to each other, or they can be formed into an integral structure by integral laying.

[0104] Please see Figure 7In some optional embodiments, the blade 1, the first blade segment 11 and the second blade segment 12 provided in this application are spaced apart at their ends facing each other in the axial direction X to form a gap 40. The connector 20 is at least partially exposed in the gap 40. The blade 1 also includes a protective shell 50, which covers at least part of the connector 20 and closes the gap 40. One end of the protective shell 50 in the axial direction X partially overlaps with and is fixedly connected to one of the first blade segment 11 and the second blade segment 12, and the other end of the protective shell 50 in the axial direction X partially overlaps with and is rotatably engaged with the other of the first blade segment 11 and the second blade segment 12.

[0105] Optionally, the connector 20 may extend only partially into the first leaf segment 11, or only partially into the second leaf segment 12. Alternatively, in some examples, the connector 20 may extend partly into the first leaf segment 11 and partly into the second leaf segment 12.

[0106] Optionally, the gap value between the first blade segment 11 and the second blade segment 12 is not specifically limited, as long as it can be ensured that the first blade segment 11 and the second blade segment 12 do not interfere with each other when the pitch is rotated.

[0107] Optionally, the protective shell 50 can be connected to the first leaf segment 11 and rotatedly engaged with the second leaf segment 12. Of course, the protective shell 50 can also be connected to the second leaf segment 12 and rotatedly engaged with the first leaf segment 11.

[0108] Optionally, the protective shell 50 can be a flexible deformable material, such as a rubber sleeve, which can provide protection while deforming when the first blade segment 11 and the second blade segment 12 rotate relative to each other, thereby avoiding restrictions on the pitching action of the blade 1 and ensuring pitching requirements.

[0109] The blade 1 provided in this application embodiment, by forming a gap 40 between the first blade segment 11 and the second blade segment 12, can ensure that when the first blade segment 11 and the second blade segment 12 rotate relative to each other to complete the pitch change under the action of the connector 20, the first blade segment 11 and the second blade segment 12 can avoid mutual interference during rotation. At the same time, the setting of the protective shell 50 and its cooperation with the first blade segment 11 and the second blade segment 12 can seal the gap 40, prevent external rainwater or wind and sand dust from entering, prevent the blade body 10 and the connector 20 from rusting, and improve the safety performance of the connector 20.

[0110] As an optional implementation, in the blade 1 provided in this application embodiment, the insertion depth L of one of the first connecting segment 21 and the second connecting segment 22 into the other ranges from 0.1D ≤ L ≤ 2D, where D is the outer diameter of the base body away from the end of the second blade segment, and L can be selected as 0.5D. The aforementioned insertion depth of the first connecting segment 21 and the second connecting segment 22 ensures sufficient installation space for each pitch bearing 231 of the transmission component 23 and improves the load-bearing capacity at the connection between the first connecting segment 21 and the second connecting segment 22.

[0111] The wind turbine generator set provided in this application includes blades 1 and hubs 2 as provided in the above embodiments. The blades 1 can be connected to the hubs 2 via a first blade segment 11, which can be optionally detachable.

[0112] In an alternative example, the first leaf segment 11 may be provided with a plurality of fixing holes 113 extending along the axial direction X, so as to be detachably connected to the hub 2 by fasteners such as bolts.

[0113] The wind turbine generator set provided in this application includes the blades 1 provided in the above embodiments. The blades 1 can be matched with corresponding first blade segments 11 according to different hub 2 sizes, achieving a modular design of the second blade segment 12 and reducing design costs. Simultaneously, since the first connecting section 21 and the second connecting section 22 rotate relative to each other through the transmission component 23, the pitch requirements of the blades can be met. A matching pitch bearing 231 is no longer needed between the first connecting section 21 and the hub 2, effectively reducing the cost of the wind turbine generator set.

[0114] 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. A blade, characterized in that, include: The blade body includes a first blade segment and a second blade segment distributed along its own axis, wherein the first blade segment is used to connect to the hub. A connector, disposed between the first leaf segment and the second leaf segment, includes a first connecting section, a second connecting section, and a transmission component. The second connecting section includes a second cylinder, a second adapter ring, and a second mounting ring. The second mounting ring and the second adapter ring are located on the same side of the second cylinder in the axial direction. The second adapter ring protrudes from the second cylinder along the axial direction. One end of the second connecting section opposite to the first connecting section is connected to the second leaf segment via the second adapter ring. The second mounting ring protrudes into the second cylinder. The first connecting section is inserted into the interior of the second cylinder. The transmission component is at least partially located between the first connecting section and the second connecting section. Between the connecting sections, the transmission component includes a pitch bearing and a drive component. One of the inner and outer rings of the pitch bearing is connected to the first connecting section and the other is connected to the second connecting section. There are two or more pitch bearings distributed along the axial direction. At least one pitch bearing is correspondingly provided with the drive component. The second mounting ring is in transmission engagement with the drive component. The first connecting section and the second connecting section are rotatably engaged with each other through the transmission component. The end of the first connecting section opposite to the second connecting section is connected to the first blade segment, and the end of the second connecting section opposite to the first connecting section is connected to the second blade segment. The second cylinder has a weight reduction cavity.

2. The blade according to claim 1, characterized in that, The driving component includes a motor and a driving wheel connected to the output end of the motor. The driving component drives the inner ring to rotate relative to the outer ring through the driving wheel. Alternatively, the drive component may include two or more telescopic cylinders distributed circumferentially along the pitch bearing, with the cylinder body of each telescopic cylinder connected to one of the inner ring and the outer ring, and the cylinder rod of each telescopic cylinder connected to the other of the inner ring and the outer ring.

3. The blade according to claim 1, characterized in that, The first connecting segment is detachably connected to the first leaf segment, and the second connecting segment is detachably connected to the second leaf segment.

4. The blade according to claim 3, characterized in that, The first connecting segment is provided with a plurality of first connecting holes, and the first leaf segment is provided with a plurality of second connecting holes. Each first connecting hole is opposite to a second connecting hole and is detachably connected by a first fastener. The second adapter ring of the second connecting segment is provided with a plurality of third connecting holes, and the second leaf segment is provided with a plurality of fourth connecting holes. Each of the third connecting holes is opposite to the fourth connecting hole and is detachably connected by a second fastener.

5. The blade according to claim 4, characterized in that, The blade also includes a threaded sleeve, which is embedded in the second connecting hole. The first fastener is threadedly connected to the threaded sleeve located in the second connecting hole, and / or, the threaded sleeve is embedded in the fourth connecting hole, and the second fastener is threadedly connected to the threaded sleeve located in the fourth connecting hole.

6. The blade according to claim 4, characterized in that, The first connecting segment and the second connecting segment are both cylindrical.

7. The blade according to claim 6, characterized in that, The first connecting segment includes a first cylindrical body and a first adapter ring. The first adapter ring is connected to one end of the first cylindrical body that is axially opposite to the second connecting segment and is disposed around the first cylindrical body. The first adapter ring protrudes radially from the first cylindrical body. The first connecting hole is disposed on the first adapter ring and extends along the axial direction.

8. The blade according to claim 7, characterized in that, The first connecting section further includes a first mounting ring, which is disposed axially opposite to the first adapter ring at both ends of the first cylinder. The first adapter ring extends into the interior of the first cylinder, and the driving component is connected to the first mounting ring.

9. The blade according to any one of claims 1 to 7, characterized in that, The first leaf segment includes a columnar base and an airfoil portion. The airfoil portion is connected to the outer peripheral surface of the base. The base is connected to the first connecting segment. The base has a plurality of fixing holes extending along the axial direction on the side opposite to the first connecting segment. The fixing holes are used to connect to the hub.

10. The blade according to claim 9, characterized in that, The cross-section of the substrate along the axial direction is circular or elliptical.

11. The blade according to claim 9, characterized in that, The airfoil is a hollow or solid plate-like structure, and its thickness gradually decreases along the direction intersecting the axis and starting from the base away from the base.

12. The blade according to claim 9, characterized in that, In the axial direction, the depth L in which one of the first connecting segment and the second connecting segment is inserted into the other is in the range of 0.1D≤L≤2D, where D is the outer diameter of the base body away from the end of the second leaf segment.

13. The blade according to any one of claims 1 to 8, characterized in that, The first and second leaf segments are spaced apart and form a gap at their axially facing ends, the connector is at least partially exposed in the gap, and the blade also includes a protective shell that covers at least a portion of the connector and closes the gap. One axially oriented end of the protective shell partially overlaps with and is fixedly connected to one of the first and second leaf segments, and the other axially oriented end of the protective shell partially overlaps with and is rotatably engaged with the other of the first and second leaf segments.

14. A wind turbine generator set, characterized in that, include: Wheel hub; The blade as described in any one of claims 1 to 13, wherein the blade is connected to the hub via the first blade segment.

15. A connector for a blade, the blade comprising a blade body, the blade body including a first blade segment and a second blade segment distributed along its own axial direction, characterized in that, The connector includes: The first connecting segment is used to connect with the first leaf segment; The second connecting section is used to connect with the second leaf segment. The second connecting section includes a second cylinder, a second adapter ring, and a second mounting ring. The second mounting ring and the second adapter ring are located on the same side of the second cylinder in the axial direction. The second adapter ring protrudes from the second cylinder in the axial direction. The end of the second connecting section opposite to the first connecting section is connected to the second leaf segment through the second adapter ring. The second mounting ring protrudes into the interior of the second cylinder. The first connecting section is inserted into the interior of the second cylinder. A transmission component is at least partially disposed between the first connecting section and the second connecting section, and the first connecting section and the second connecting section are rotatably engaged by the transmission component; the transmission component includes a pitch bearing and a drive component, one of the inner ring and the outer ring of the pitch bearing is connected to the first connecting section and the other is connected to the second connecting section; there are two or more pitch bearings, which are distributed along the axial direction, and at least one pitch bearing is correspondingly provided with the drive component, the second mounting ring is in transmission engagement with the drive component, and the second cylinder has a weight reduction cavity.

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