Blade assembly, wind driven generator and noise reducer

Abstract

The utility model relates to a blade assembly, a wind driven generator and a noise reducer, the blade assembly comprises a blade body, the blade body is provided with a blade root, a blade tip, a front edge and a rear edge, and the front edge and the rear edge extend between the blade root and the blade tip; the noise reduction device is arranged on the blade body, the noise reduction device comprises at least one reinforcing piece and a plurality of spacing pieces, the spacing pieces are arranged at intervals in the spanwise direction of the blade body, the reinforcing piece is connected with the at least one spacing piece, and the reinforcing piece and the spacing pieces are arranged adjacent to the rear edge; and in the direction parallel to the chord of the blade body, at least part of the distance piece and the reinforcing piece are located outside the boundary limited by the chord, and a spacing space exists between the reinforcing piece and the rear edge. According to the technical scheme provided by the invention, the blade rotation noise can be reduced.

Description

Technical Field

[0001] This disclosure relates to the technical field of wind turbine blades, and particularly to a blade assembly, a wind turbine, and a noise reducer. Background Technology

[0002] Wind turbines convert wind energy into mechanical energy by rotating blades driven by wind power. The mechanical energy is then converted into electrical energy by rotating the turbine through the hub and gearbox.

[0003] However, during the operation of wind turbines, the blades generate aerodynamic noise when cutting through the air, which causes noise pollution and affects the normal lives of nearby residents. Utility Model Content

[0004] The purpose of this disclosure is to provide a blade assembly, a wind turbine, and a noise reducer that can reduce blade rotation noise.

[0005] According to one aspect of the present disclosure, a blade assembly is provided, the blade assembly comprising: a blade body having a leaf root, a leaf tip, a leading edge, and a trailing edge, the leading edge and the trailing edge extending between the leaf root and the leaf tip;

[0006] A noise reducer is disposed on the blade body. The noise reducer includes at least one reinforcing member and a plurality of spacers, the plurality of spacers being arranged at intervals along the spanwise direction of the blade body. The reinforcing member is connected to at least one of the spacers, and the reinforcing member and the spacers are arranged adjacent to the trailing edge. In a direction parallel to the chord of the blade body, at least a portion of the spacers and the reinforcing member are located outside the boundary defined by the chord, and there is a gap between the reinforcing member and the trailing edge.

[0007] Through the above scheme, the airflow leaving the blade body from the trailing edge can flow through a noise reducer containing at least one reinforcing member and several spacers, thereby reducing aerodynamic noise. Simultaneously, the reinforcing member can be connected to at least one spacer, improving the overall strength of the noise reducer, preventing breakage under aerodynamic loads, improving static and fatigue strength, and extending service life. Furthermore, the reinforcing member and spacers can couple with the trailing edge flow field to participate in noise reduction, altering the intensity and spectral structure of the sound source, and diverting more noise energy to areas less sensitive to the human ear and areas with high atmospheric dissipation rates, thus reducing noise.

[0008] Optionally, in a direction parallel to the chord of the blade body, the spacer portion is located outside the boundary defined by the chord.

[0009] Optionally, the spacer has a first end and a second end, wherein, in a direction parallel to the chord of the blade body, the first end is located within a boundary defined by the chord, and the second end extends beyond the trailing edge.

[0010] Optionally, the spacer is located outside the boundary defined by the chord in a direction parallel to the chord of the blade body.

[0011] With the above solution, all spacers can participate in noise reduction, thus improving the noise reduction effect.

[0012] Optionally, the noise reducer further includes a connector, and a plurality of the spacers are connected to the blade body via the connector, with the connector and the reinforcing member spaced apart.

[0013] The above method allows for the pre-assembly of several spacers and connectors into a single unit, which can then be installed integrally on the blade body during assembly, facilitating installation and improving efficiency.

[0014] Optionally, the noise reducer further includes a positioning element connected to the connecting element; when the noise reducer is connected to the blade body, the positioning element abuts against the trailing edge or a region adjacent to the trailing edge.

[0015] With the above method, during installation, the noise reducer can first determine the installation position by abutting the positioning part against the area of ​​the trailing edge or adjacent to the trailing edge, and then connect the connecting part to the blade body to ensure the accuracy of the installation position and ensure the noise reduction effect.

[0016] Optionally, in the noise reduction device, the first spacer along the spanwise direction of the blade body is defined as the first spacer, the last spacer as the second spacer, the line connecting the first centroid of the first spacer and the second centroid of the first spacer is the first line, the line connecting the first centroid of the second spacer and the second centroid of the second spacer is the second line, the line connecting the first centroids of all the spacers is the third line, and the line connecting the second centroids of all the spacers is the fourth line; wherein the first line, the second line, the third line, and the fourth line form a three-dimensional curved surface.

[0017] Optionally, from a top view of the noise reducer, the reinforcing member is constructed as a quadrilateral and has a first side, a second side, a third side, and a fourth side connected in sequence; the first side and the third side are parallel to each other and have a preset angle between them and the center line of the spacer.

[0018] Through the above-described scheme, the reinforcing member can not only break down large-scale eddies into smaller ones and redirect noise to areas less sensitive to the human ear, thereby reducing noise levels, but also effectively reduce the size of the sound source by tilting the first and third sides at a certain angle, thus lowering the noise level.

[0019] Optionally, the range of the preset included angle is less than 45°.

[0020] Optionally, the reinforcing member has at least two members, with two adjacent reinforcing members arranged symmetrically about the gap between two adjacent spacers and in a generally V-shape, and the openings facing the blade body.

[0021] With the above scheme, the V-shape formed by the two reinforcing members can have a sawtooth structure on both the inner and outer sides of the V-shape. This sawtooth structure can be used to more effectively suppress the size of the sound source, thereby breaking up the large vortex, increasing airflow disturbance and reducing the noise level.

[0022] Optionally, the cross-sectional shapes of some of the spacers may be the same or different; and / or, at least some of the spacers have a cross-sectional shape of rectangle, circle, triangle and ellipse; and / or, the cross-sectional dimensions of at least some of the spacers gradually decrease from the first end of the spacer to the second end of the spacer; and / or, at least some of the spacers are made of plastic, composite material and porous material.

[0023] With the above solution, the cross-sectional dimensions of at least some of the spacers gradually decrease from the first end to the second end. This allows for control of the overall weight of the noise reducer while ensuring the root of the spacers is sufficiently robust, preventing breakage and extending their service life.

[0024] Optionally, the blade body also has a suction side and a pressure side, and the noise reducer is fixed on the suction side.

[0025] Optionally, the blade body also has a suction side and a pressure side, and the noise reducer is fixed on the pressure side.

[0026] The above solution allows the pressure on the pressure side to press the noise reducer against the pressure side, improving the stability of the noise reducer during wind turbine operation.

[0027] According to another aspect of this disclosure, a wind turbine is also provided, which includes at least the aforementioned blade assembly.

[0028] According to another aspect of this disclosure, a noise reduction device is also provided, the noise reduction device comprising at least: a connector for connecting to a blade body; a plurality of spacers connected to the connector and spaced apart along a predetermined direction; and a reinforcing member connected to at least one of the spacers, wherein there is a gap between the reinforcing member and the connector.

[0029] Optionally, the noise reducer further includes a positioning element connected to the connecting element, the positioning element being used to abut against the trailing edge when the noise reducer is connected to the blade body; and / or,

[0030] The cross-sectional shapes of the spacers may be the same or different; and / or,

[0031] At least some of the spacers have a cross-sectional shape that is rectangular, circular, triangular, or elliptical; and / or,

[0032] At least a portion of the spacer's cross-sectional dimensions gradually decrease from the first end of the spacer to the second end of the spacer; and / or,

[0033] At least a portion of the spacer is made of one of the following materials: plastic, resetting material, and porous material. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of a wind turbine generator according to an embodiment of the present disclosure is shown;

[0036] Figure 2 A schematic diagram of the structure of a blade assembly according to an embodiment of the present disclosure is shown;

[0037] Figure 3 A schematic cross-sectional view of a blade assembly according to an embodiment of the present disclosure is shown;

[0038] Figure 4 It shows Figure 3 Enlarged schematic diagram of part A;

[0039] Figure 5 A schematic diagram of a noise reduction device according to an embodiment of the present disclosure is shown;

[0040] Figure 6 A top view schematic diagram of a noise reduction device according to an embodiment of the present disclosure is shown;

[0041] Figure 7 A partial structural schematic diagram of the connection between the noise reducer and the blade body according to another embodiment of the present disclosure is shown;

[0042] Figure 8 A schematic diagram of a noise reduction device according to another embodiment of the present disclosure is shown;

[0043] Figure 9 A top view schematic diagram of a reinforcement according to an embodiment of the present disclosure is shown.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10. Wind turbine; 100. Blade assembly; 200. Hub; 300. Nacelle; 400. Tower;

[0046] 110. Leaf body; 111. Leaf root; 112. Leaf tip; 113. Leading edge; 114. Trailing edge; 115. Chord; 116. Suction side; 117. Pressure side;

[0047] 120. Noise reducer; 121. Reinforcing member; 1211. First side; 1212. Second side; 1213. Third side; 1214. Fourth side; 122. Spacer; 1221. First end; 1222. Second end; 1223. First connecting line; 1224. Second connecting line; 1225. Third connecting line; 1226. Fourth connecting line; 123. Connector; 124. Positioning member;

[0048] α, preset included angle; β, three-dimensional curved surface. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.

[0050] like Figure 1As shown, this disclosure provides a wind turbine generator 10, which may include a blade assembly 100, a hub 200, a nacelle 300, and a tower 400. The nacelle 300 is mounted on top of the tower 400 and may be fixedly connected to the tower 400 or rotatably connected to the tower 400 via a yaw bearing. A generator may be housed inside the nacelle 300. The hub 200 is connected to the generator rotor via a main shaft, or the hub 200 is connected to the generator via a gearbox. The blade assembly 100 is connected to the hub 200, so that when wind blows the blade assembly 100, the wind power can drive the hub 200 to rotate through the blade assembly 100, converting wind energy into mechanical energy. This mechanical energy is then converted into electrical energy by the generator rotor via the hub 200.

[0051] For example, the hub 200 may have at least two blade assemblies 100, which drive the hub 200 to rotate only. For example, there may be two or three blade assemblies 100. The hub 200 may also have one or more blade assemblies 100 and at least one individual blade (hereinafter referred to as blade body 110), which work together to drive the hub 200 to rotate.

[0052] Regarding the specific structure of the blade assembly 100, as follows: Figures 2 to 6 As shown, in some embodiments, the blade assembly 100 may include a blade body 110 having a root 111 and a tip 112 located at opposite ends. The root 111 is the portion of the blade body 110 connected to the hub 200, possessing sufficient strength to withstand wind and centrifugal forces. The tip 112 is the point on the blade body 110 furthest from the hub 200. The blade body 110 also has a leading edge 113 and a trailing edge 114 extending between the root 111 and the tip 112. The leading edge 113 is the foremost point of the cross-section of the blade body 110, the position where the airflow first contacts the blade body 110. The trailing edge 114 is the furthest point of the cross-section of the blade body 110, the position where the airflow leaves the blade body 110. When viewed along the spanwise direction of the blade body 110, all points at the leading edge 113 of the cross-section form a curve, and all points at the trailing edge 114 of the cross-section form a curve. Accordingly, in each cross-section, the line connecting the leading edge 113 and the trailing edge 114 is a chord 115, and the chord length can gradually change along the span of the blade body 110. It should be noted that the span of the blade body 110 refers to the length direction of the blade body 110 in the radial direction of the wind turbine, that is, the direction from the blade root 111 to the blade tip 112.

[0053] In this embodiment, the blade assembly 100 may further include a noise reducer 120, which is disposed on the blade body 110 to reduce aerodynamic noise generated when the blade body 110 rotates. Specifically, the noise reducer 120 may include at least one reinforcing member 121 and a plurality of spacers 122, the spacers 122 being arranged at intervals along the spanwise direction of the blade body 110. The reinforcing member 121 is connected to at least one spacer 122, and the reinforcing member 121 and the spacers 122 are arranged adjacent to the trailing edge 114. Specifically, in a direction parallel to the chord 115, at least a portion of the spacers 122 and the reinforcing member 121 are located outside the boundary defined by the chord 115, and there is a gap between the reinforcing member 121 and the trailing edge 114. That is, in a direction parallel to the chord 115, the reinforcing member 121 and the trailing edge 114 are not in contact, but are spaced apart. In this way, the airflow leaving the blade body 110 from the trailing edge 114 can flow through the noise reducer 120 containing at least one reinforcing member 121 and several spacers 122, and the aerodynamic noise is reduced by the noise reducer 120.

[0054] Simultaneously, the reinforcing member 121 can be connected to at least one spacer 122, improving the overall strength of the noise reducer 120, preventing breakage by aerodynamic loads, improving static strength and fatigue strength, and extending service life. The reinforcing member 121, together with the spacer 122, can couple with the flow field of the trailing edge 114 to participate in noise reduction, changing the intensity and spectral structure of the sound source, and diverting more noise energy to areas less sensitive to the human ear and areas with high atmospheric dissipation rates, thereby reducing noise. In particular, the reinforcing member 121 only needs to have a space between it and the trailing edge 114, thus maximizing the freedom in the design of its shape and raising the noise reduction ceiling of the noise reducer 120.

[0055] It needs to be explained that the blade body 110 has multiple chords 115. Here, a chord 115 refers to the chord 115 whose extension passes through the spacer 122 and / or reinforcing member 121 defined herein, or refers to the chord 115 adjacent to the spacer 122 and / or reinforcing member 121 defined herein. That is, the chord 115 corresponds to the spacer 122 and the reinforcing member 121. For example, as... Figure 3 In the cross-sectional schematic diagram of the blade assembly 100 shown, chord 115 is unique, the extension line of chord 115 passes through spacer 122, and chord 115 is adjacent to spacer 122.

[0056] Optionally, the reinforcing member 121 can be connected to one spacer 122, or the reinforcing member 121 can be connected to at least two spacers 122, thereby connecting at least two spacers 122 into one unit. The blade assembly 100 may have only one noise reducer 120; that is, a single blade body 110 may have only one noise reducer 120. Noise reducers 120 of corresponding lengths can be manufactured according to the required arrangement length, thus requiring only one installation operation to complete the installation of the noise reducer 120. Of course, the blade assembly 100 may also have multiple noise reducers 120, arranged along the spanwise direction of the blade body 110. Thus, according to the required arrangement length, a corresponding number of noise reducers 120 can be selected, and multiple noise reducers 120 can be combined on a single blade body 110 to achieve the required length.

[0057] In some embodiments, such as Figure 7 As shown, in a direction parallel to the chord 115 of the blade body 110, the spacer 122 may be partially located outside the boundary defined by the chord 115, and another part of the spacer 122 may be located inside the boundary defined by the chord 115.

[0058] For example, spacer 122 has a first end 1221 and a second end 1222 disposed opposite to each other. In a direction parallel to the chord 115 of the blade body 110, the first end 1221 is located within the boundary defined by the chord 115, and the second end 1222 extends beyond the trailing edge 114 and is located outside the boundary defined by the chord 115. Optionally, the first end 1221 can be directly connected to the blade body 110. To facilitate the installation of the spacers 122, the first ends 1221 of the spacers 122 can be first fixed to the connector 123, and then fixed to the blade body 110 by the connector 123.

[0059] In other embodiments, such as Figures 4 to 6 As shown, in a direction parallel to the chord 115 of the blade body 110, the spacer 122 is located outside the boundary defined by the chord 115. In this way, the spacer 122 can fully participate in noise reduction, thereby improving the noise reduction effect.

[0060] In this embodiment, the noise reducer 120 may further include a connector 123, and a plurality of spacers 122 are connected to the blade body 110 via the connector 123. The connector 123 and the reinforcing member 121 are spaced apart. In this way, the plurality of spacers 122 and the connector 123 can be pre-formed as a whole, and can be integrally installed on the blade body 110 during assembly, which facilitates the installation operation and improves the installation efficiency.

[0061] For example, the connector 123 can be constructed as a plate, with one side of the connector 123 bonded to the blade body 110, and a plurality of spacers 122 disposed on the ends of the blade body 110. Optionally, the plurality of spacers 122 can be integrally designed with the connector 123, for example, by injection molding, die-cutting, casting, etc. Alternatively, the plurality of spacers 122 can be separately designed with the connector 123 and then connected to each other as a whole.

[0062] To improve the accuracy of the installation position of the noise reducer 120 on the blade body 110, in some embodiments, the noise reducer 120 may further include a positioning member 124, which is connected to the connecting member 123. When the noise reducer 120 is connected to the blade body 110, the positioning member 124 abuts against the trailing edge 114 or a region adjacent to the trailing edge 114. That is, during installation, the noise reducer 120 can first determine its installation position by having the positioning member 124 abut against the region adjacent to the trailing edge 114, and then connect the connecting member 123 to the blade body 110 to ensure the accuracy of the installation position and ensure the noise reduction effect.

[0063] like Figure 3 As shown, the blade body 110 also has a suction side 116 and a pressure side 117, which extend between the blade root 111 and the blade tip 112. The suction side 116, being the side of the blade body 110 facing away from the wind, has lower air pressure and generates lift. The pressure side 117, being the side of the blade body 110 facing the wind, has relatively higher air pressure. In some embodiments, the aforementioned noise reduction device 120 can be fixed to the suction side 116.

[0064] In some other embodiments, the aforementioned noise reducer 120 can also be fixed to the pressure side 117. This allows the pressure on the pressure side 117 to press the noise reducer 120 against it, improving its stability. Furthermore, the suction side 116 has a relatively small effective area on the noise reducer 120, reducing the suction force exerted by the suction side 116 on the noise reducer 120 and further improving its connection stability. Thus, while ensuring the connection stability between the noise reducer 120 and the blade body 110, the connection structure between the noise reducer 120 and the blade body 110 can be appropriately simplified, reducing costs.

[0065] In some embodiments, the properties of the plurality of spacers 122 may be the same or different. Specifically, the cross-sectional shapes of the plurality of spacers 122 may be the same or different; for example, the cross-sectional shape of the spacer 122 may be one or more of a rectangle, a circle, a triangle, and an ellipse. The lengths of the plurality of spacers 122 may be the same or different. The overall shapes of the plurality of spacers 122 may be the same or different; for example, the main extension line of the spacer 122 may be straight or curved. Taking the main extension line of the spacer 122 as an example, the spacer 122 may be a rod-shaped or plate-shaped structure, etc. The materials of the plurality of spacers 122 may be the same or different; for example, at least some of the spacers 122 are made of a material selected from plastics, composite materials, and porous materials.

[0066] In some embodiments, such as Figure 5 As shown, the cross-sectional dimensions of at least a portion of the spacer 122 can be gradually varied. For example, the cross-sectional dimensions of at least a portion of the spacer 122 gradually decrease from the first end 1221 of the spacer 122 to the second end 1222 of the spacer 122. This allows for control of the overall weight of the noise reducer 120 while ensuring that the root of the spacer 122 is sufficiently robust, preventing breakage and extending its service life.

[0067] In some other embodiments, the cross-sectional dimensions of at least a portion of the spacer 122 may also be constant.

[0068] In the noise reduction device 120, the first spacer 122 along the spanwise direction of the blade body 110 is defined as the first spacer, and the last spacer 122 is defined as the second spacer. The line connecting the centroid of the first end 1221 of the first spacer and the centroid of the second end 1222 of the first spacer is the first connecting line; the line connecting the centroid of the first end 1221 of the second spacer and the centroid of the second end 1222 of the second spacer is the second connecting line; the line connecting the centroids of the first ends 1221 of all spacers 122 is the third connecting line; and the line connecting the centroids of the second ends 1222 of all spacers 122 is the fourth connecting line 1226. In some embodiments, such as... Figure 5 As shown, the surface formed by the first connecting line 1223, the second connecting line 1224, the third connecting line 1225, and the fourth connecting line 1226 is a plane. In other words, several spacers 122 are arranged along a straight line to facilitate production operations.

[0069] In some other embodiments, such as Figure 8 As shown, the surface formed by connecting the first line 1223, the second line 1224, the third line 1225, and the fourth line 1226 is a three-dimensional curved surface β. In other words, several spacers 122 are arranged along a curve, such as an arc or... Figure 8 The wavy shape shown is an example.

[0070] In this embodiment, in any two-dimensional plane projection that is not perpendicular to the aforementioned three-dimensional curved surface β, the noise reducer 120 has a first projected area formed by all the reinforcing members 121. The three-dimensional curved surface β has a second projected area, and the overlapping part of the two is a third projected area. The ratio of the third projected area to the second projected area ranges from 1% to 100%. The ratio of the first projected area to the second projected area also ranges from 1% to 100%. That is to say, the reinforcing members 121 do not completely cover the three-dimensional curved surface β.

[0071] The aforementioned reinforcing member 121 can be constructed in any shape, specifically, from Figure 6 From the top-down view shown, the reinforcing member 121 can be circular, triangular, quadrilateral, teardrop-shaped, or any other arbitrary shape.

[0072] Taking the top view of the noise reducer 120 as an example, the reinforcing member 121 is constructed as a quadrilateral. Figure 6 and Figure 9 As shown, the reinforcing member 121 has a first side 1211, a second side 1212, a third side 1213, and a fourth side 1214 connected in sequence. The first side 1211 and the third side 1213 are parallel to each other, and both the first side 1211 and the third side 1213 have a predetermined angle α with the center line of the spacer 122. The predetermined angle α is an acute angle and less than 45°. Thus, when airflow passes through the reinforcing member, the sound source intensity can be effectively suppressed.

[0073] Each noise reducer 120 may have one, two, or more reinforcements 121.

[0074] In some embodiments, such as Figure 6 As shown, each noise reducer 120 has at least two reinforcing members 121, and two adjacent reinforcing members 121 are arranged symmetrically and approximately in a V-shape with respect to the gap between two adjacent spacers 122, with the V-shaped opening facing the blade body 110. It can be understood that the V-shape formed by the two reinforcing members 121 can have serrated structures on both the inner and outer sides, thereby more effectively dispersing large-scale eddies and shifting sound frequencies to areas less sensitive to the human ear, thus reducing noise.

[0075] For example, the reinforcing member 121 can be designed separately from several spacers 122, and the reinforcing member 121 can be connected to the spacers 122 by embedding. The reinforcing member 121 can also be designed as an integral part of the spacers 122 by injection molding, casing, casting or 3D printing.

[0076] According to another aspect of this disclosure, a noise reduction device 120 is also provided. For example... Figure 5 and Figure 6As shown, the noise reduction device 120 may include at least a connector 123, a plurality of spacers 122, and a reinforcing member 121. The connector 123 is used to connect to the blade body 110. The plurality of spacers 122 are connected to the connector 123 and are arranged at intervals along a predetermined direction. The reinforcing member 121 is connected to at least one spacer 122, and there is a gap between the reinforcing member 121 and the connector 123. When the noise reduction device 120 is connected to the blade body 110, the predetermined direction is the spanwise direction of the blade body 110.

[0077] Furthermore, the noise reducer 120 may also include a positioning member 124, which is connected to the connector 123. The positioning member 124 is used to abut against the trailing edge 114 when the noise reducer 120 is connected to the blade body 110; and / or,

[0078] The cross-sectional shapes of the spacers 122 may be the same or different; and / or,

[0079] At least a portion of the spacer 122 has a cross-sectional shape that is rectangular, circular, triangular, or elliptical; and / or,

[0080] At least a portion of the cross-sectional dimensions of the spacer 122 gradually decrease from the first end 1221 of the spacer 122 to the second end of the spacer 122; and / or,

[0081] At least a portion of the spacer 122 is made of one of the following materials: plastic, composite material, and porous material.

[0082] It should be noted that the specific structure of the connector 123, the plurality of spacers 122 and the reinforcing member 121 can be found in the detailed description in the above embodiments, and will not be repeated here.

[0083] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.

[0084] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0085] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A vane assembly, characterized by, The blade assembly (100) comprises: a blade body (110) having a blade root (111), a blade tip (112), a leading edge (113) and a trailing edge (114), the leading edge (113) and the trailing edge (114) extending between the blade root (111) and the blade tip (112); a noise reducer (120) arranged on the blade body (110), the noise reducer (120) comprising at least one reinforcing piece (121) and a plurality of spacing pieces (122), the plurality of spacing pieces (122) being arranged at intervals along a spanwise direction of the blade body (110), the reinforcing piece (121) being connected with at least one of the spacing pieces (122), and the reinforcing piece (121) and the spacing pieces (122) being arranged adjacent to the trailing edge (114); wherein, in a direction parallel to a chord (115) of the blade body (110), at least part of the spacing pieces (122) and the reinforcing piece (121) are located outside a boundary defined by the chord (115), and there is a spacing space between the reinforcing piece (121) and the trailing edge (114).

2. The vane assembly of claim 1, wherein, In a direction parallel to a chord (115) of the blade body (110), part of the spacing pieces (122) are located outside a boundary defined by the chord (115).

3. The vane assembly of claim 2, wherein, The spacing piece (122) has a first end (1221) and a second end (1222), wherein, in a direction parallel to a chord (115) of the blade body (110), the first end (1221) is located within a boundary defined by the chord (115), and the second end (1222) exceeds the trailing edge (114).

4. The vane assembly of claim 1, wherein, In a direction parallel to a chord (115) of the blade body (110), the spacing piece (122) is located outside a boundary defined by the chord (115).

5. The vane assembly of claim 4, wherein, The noise reducer (120) further comprises a connecting piece (123), the plurality of spacing pieces (122) being connected to the blade body (110) through the connecting piece (123), and the connecting piece (123) is arranged at intervals with the reinforcing piece (121).

6. The vane assembly of claim 5, wherein, The noise reducer (120) further comprises a positioning piece (124), the positioning piece (124) being connected with the connecting piece (123); When the noise reducer (120) is connected to the blade body (110), the positioning piece (124) abuts against the trailing edge (114) or a region adjacent to the trailing edge (114).

7. The vane assembly of any one of claims 1 to 6, wherein, In the noise reducer (120), the first interval piece (122) along the spanwise of the blade body (110) is defined as the first interval piece, and the last interval piece (122) is defined as the second interval piece. The first end (1221) of the first interval piece and the second end (1222) of the first interval piece are connected to form a first line (1223). The first end (1221) of the second interval piece and the second end (1222) of the second interval piece are connected to form a second line (1224). The first end (1221) of all the interval pieces (122) are connected to form a third line (1225). The second end (1222) of all the interval pieces are connected to form a fourth line (1226). The first line (1223), the second line (1224), the third line (1225) and the fourth line (1226) are connected to form a three-dimensional curved surface (β).

8. The vane assembly of any one of claims 1 to 6, wherein, From the top view of the noise reducer (120), the reinforcing piece (121) is configured as a quadrilateral, and has a first side (1211), a second side (1212), a third side (1213) and a fourth side (1214) connected in sequence. The first side (1211) and the third side (1213) are parallel to each other, and there is a preset included angle between the first side (1211) and the third side (1213) and the center line of the interval piece (122).

9. The vane assembly of claim 8, wherein, The preset included angle is less than 45°.

10. The vane assembly of claim 8, wherein, The reinforcing piece (121) has at least two, and the adjacent two reinforcing pieces (121) are symmetrically arranged about the gap between the adjacent two interval pieces (122) and are substantially V-shaped, and the opening is arranged towards the blade body (110).

11. The vane assembly of claim 1, wherein, The cross-sectional shapes of the interval pieces (122) can be the same or different; and / or, The cross-sectional shape of at least part of the interval piece (122) is one of a rectangle, a circle, a triangle and an ellipse; and / or, The cross-sectional dimension of at least part of the interval piece (122) gradually decreases from the first end (1221) of the interval piece (122) to the second end (1222) of the interval piece (122); and / or, The material of at least part of the interval piece (122) is one of plastic, composite material and porous material.

12. The vane assembly of claim 1, wherein, The blade body (110) further has a suction side (116) and a pressure side (117), and the noise reducer (120) is fixed on the suction side (116).

13. The vane assembly of claim 1, wherein, The blade body (110) further has a suction side (116) and a pressure side (117), and the noise reducer (120) is fixed on the pressure side (117).

14. A wind driven electrical generator characterised by The wind turbine at least comprises the blade assembly (100) according to any one of claims 1 to 13.

15. A noise reducer characterized by The noise reducer (120) at least comprises: a connecting piece (123) for connecting with the blade body (110); a plurality of interval pieces (122) connected to the connecting piece (123) and arranged in a predetermined direction; and a plurality of interval pieces (122) connected to the connecting piece (123) and arranged in a predetermined direction. The reinforcing member (121) is connected with at least one of the spacing members (122), and there is a spacing space between the reinforcing member (121) and the connecting member (123).

16. The noise reducer of claim 15, wherein The noise reducer (120) further comprises a positioning member (124) connected with the connecting member (123), and the positioning member (124) is used for abutting against the trailing edge (114) when the noise reducer (120) is connected to the blade body (110); and / or, The cross-sectional shapes of the plurality of spacing members (122) can be the same or different; and / or, The cross-sectional shape of at least part of the spacing members (122) is one of a rectangle, a circle, a triangle, and an ellipse; and / or, The cross-sectional size of at least part of the spacing members (122) gradually decreases from the first end (1221) of the spacing member (122) to the second end (1222) of the spacing member (122); and / or, The material of at least part of the spacing members (122) is one of plastic, composite material, and porous material.

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