Blade assembly, wind driven generator and noise reducer

Abstract

The invention 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] The present disclosure relates to the technical field of blades of wind turbines, and particularly to a blade assembly, a wind turbine and a noise reducer. Background Art

[0002] A wind turbine drives the blades to rotate through wind power, converts wind energy into mechanical energy, and then drives the generator to rotate through the hub and gearbox, so as to convert mechanical energy into electrical energy by using the electromagnetic induction principle of the generator.

[0003] However, during the operation of a wind turbine, pneumatic noise is generated when the blades cut the air, forming noise pollution, which affects the normal life of surrounding residents. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a blade assembly, a wind turbine and a noise reducer, which can reduce the noise generated by the rotation of the blades.

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

[0006] a noise reducer disposed on the blade body, the noise reducer including at least one reinforcing member and a plurality of spacers, the plurality of spacers being arranged at intervals in the span direction of the blade body, the reinforcing member being connected to at least one of the spacers, and the reinforcing member and the spacers being disposed adjacent to the trailing edge; wherein, in a direction parallel to the chord of the blade body, at least a part of the spacers and the reinforcing member are located outside the boundary defined by the chord, and there is an interval space between the reinforcing member and the trailing edge.

[0007] Through the above solution, the air flow leaving the blade body from the trailing edge can flow through the noise reducer containing at least one reinforcing member and a plurality of spacers, and the pneumatic noise is reduced by the noise reducer. At the same time, the reinforcing member can be connected to at least one spacer to improve the overall strength of the noise reducer, avoid being broken by pneumatic loads, improve the static strength and fatigue strength, and extend the service life; the reinforcing member can also be coupled with the trailing edge flow field together with the spacers to participate in noise reduction, change the intensity and frequency spectrum structure of the sound source, and transfer more noise energy to areas where the human ear is less sensitive and areas with a high atmospheric dissipation rate, thereby reducing the noise.

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

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

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

[0011] With the above solution, the spacer can fully participate in noise reduction, improving the noise reduction effect.

[0012] Optionally, the noise reducer further includes a connecting member. A plurality of the spacers are connected to the blade body through the connecting member, and the connecting member is spaced from the reinforcing member.

[0013] With the above solution, a plurality of spacers and the connecting member can be pre-formed into one body. During assembly, they can be integrally installed on the blade body, facilitating the installation operation and improving the installation efficiency.

[0014] Optionally, the noise reducer further includes a positioning member connected to the connecting member. When the noise reducer is connected to the blade body, the positioning member abuts against the trailing edge or an area adjacent to the trailing edge.

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

[0016] Optionally, in the noise reducer, the first spacer along the span direction of the blade body is defined as the first spacer, and the last spacer is defined as the second spacer. The line connecting the centroid of the first end and the centroid of the second end of the first spacer is the first line, the line connecting the centroid of the first end and the centroid of the second end of the second spacer is the second line, the line connecting the centroids of the first ends of all the spacers is the third line, and the line connecting the centroids of the second ends of all the spacers is the fourth line. Among them, the first line, the second line, the third line, and the fourth line enclose a three-dimensional surface.

[0017] Optionally, from the top-down view of the noise reducer, the reinforcing member is configured as a quadrilateral and has a first side, a second side, a third side, and a fourth side that are connected in sequence. The first side and the third side are parallel to each other and have a preset included angle with the center line of the spacer.

[0018] Through the above solution, the reinforcing member can not only break up large-scale eddies into small-scale eddies, migrating the noise to the area insensitive to the human ear, thereby reducing the noise level. Moreover, the first side and the third side which are inclined at a certain angle range can also effectively reduce the size of the sound source, thereby reducing the noise level.

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

[0020] Optionally, there are at least two of the reinforcing members, and two adjacent reinforcing members are symmetric about the gap between two adjacent spacers and are arranged substantially in a V shape, with the opening facing the blade body.

[0021] Through the above solution, the V shape formed by the two reinforcing members can form a serrated structure on both the inner and outer sides of the V shape, so that the size of the sound source can be more effectively suppressed by using the serrated structure, thereby breaking up large eddies, increasing air flow disturbance and reducing the noise level.

[0022] Optionally, the cross-sectional shapes of several of the spacers may be the same or different; and / or, the cross-sectional shape of at least some of the spacers is one of a rectangle, a circle, a triangle, and an ellipse; and / or, the cross-sectional size of at least some of the spacers gradually decreases from the first end of the spacer to the second end of the spacer; and / or, the material of at least some of the spacers is one of plastic, composite material, and porous material.

[0023] Through the above solution, the cross-sectional size of at least some of the spacers gradually decreases from the first end of the spacer to the second end of the spacer. In this way, while controlling the overall weight of the noise reducer, it can ensure that the root of the spacer is thick enough to avoid breakage and damage of the spacer and improve the service life.

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

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

[0026] Through the above solution, on the one hand, the pressure on the pressure side can press the noise reducer on the pressure side, improving the stability of the noise reducer during the operation of the fan.

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

[0028] According to another aspect of the present disclosure, a noise reducer is further provided. The noise reducer at least includes: a connecting member for connecting to the blade body; a plurality of spacers connected to the connecting member and arranged at intervals along a preset direction; and a reinforcing member connected to at least one of the spacers, and there is a spaced space between the reinforcing member and the connecting member.

[0029] Optionally, the noise reducer further includes a positioning member connected to the connecting member. The positioning member is configured 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 plurality of spacers may be the same or different; and / or,

[0031] The cross-sectional shape of at least some of the spacers is one of a rectangle, a circle, a triangle, and an ellipse; and / or,

[0032] The cross-sectional dimension of at least some of the spacers gradually decreases from the first end to the second end of the spacer; and / or,

[0033] The material of at least some of the spacers is one of plastic, a reset material, and a porous material. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 Shows a schematic structural diagram of a wind turbine according to an embodiment of the present disclosure;

[0036] Figure 2 Shows a schematic structural diagram of a blade assembly according to an embodiment of the present disclosure;

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

[0038] Figure 4 Shows Figure 3 An enlarged schematic view of part A of

[0039] Figure 5 Shows a schematic structural diagram of a noise reducer according to an embodiment of the present disclosure;

[0040] Figure 6 Shows a top view schematic diagram of a noise reducer according to an embodiment of the present disclosure;

[0041] Figure 7 Shows a partial structural schematic diagram of a noise reducer connected to a blade body according to another embodiment of the present disclosure;

[0042] Figure 8 Shows a structural schematic diagram of a noise reducer according to another embodiment of the present disclosure;

[0043] Figure 9 Shows a top view schematic diagram of a reinforcing member according to an embodiment of the present disclosure.

[0044] Description of reference numerals:

[0045] 10, wind turbine; 100, blade assembly; 200, hub; 300, nacelle; 400, tower;

[0046] 110, blade body; 111, blade root; 112, blade 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 connection line; 1224, second connection line; 1225, third connection line; 1226, fourth connection line; 123, connecting member; 124, positioning member;

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

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

[0050] As Figure 1As shown, the present disclosure provides a wind turbine 10, which may include a blade assembly 100, a hub 200, a nacelle 300, and a tower 400. Among them, the nacelle 300 is installed on the top of the tower 400. The nacelle 300 may be fixedly connected to the tower 400 or rotatably connected to the tower 400 through a yaw bearing. A generator may be provided inside the nacelle 300. The hub 200 is connected to the rotor of the generator through a main shaft, or the hub 200 is connected to the generator through a gearbox. The blade assembly 100 is connected to the hub 200. Thus, when the wind blows the blade assembly 100, the wind energy can drive the hub 200 to rotate through the blade assembly 100, converting the wind energy into mechanical energy, and then driving the rotor of the generator to rotate through the hub 200, and the generator converts the mechanical energy into electrical energy.

[0051] Exemplarily, the hub 200 may have at least two blade assemblies 100, and only the at least two blade assemblies 100 drive the hub 200 to rotate. For example, the blade assembly 100 may be two, three, etc. The hub 200 may also have one or more blade assemblies 100 and at least one single blade (subsequently referred to as a blade body 110), and the blade assembly 100 and the blade cooperate to drive the hub 200 to rotate.

[0052] Regarding the specific structure of the blade assembly 100, as Figures 2 to 6 shown, in some embodiments, the blade assembly 100 may include a blade body 110, and the blade body 110 has a blade root 111 and a blade tip 112 located at opposite ends. Among them, the blade root 111 is the part where the blade body 110 is connected to the hub 200, and it has sufficient strength to withstand wind force and centrifugal force. The blade tip 112 is the point where the blade body 110 is far from the hub 200. The blade body 110 also has a leading edge 113 and a trailing edge 114 extending between the blade root 111 and the blade tip 112. Among them, the leading edge 113 is the point at the forefront of the cross-section of the blade body 110, and it is the position where the air flow first contacts the blade body 110. The trailing edge 114 is the point at the rearmost end of the cross-section of the blade body 110, and it is the position where the air flow leaves the blade body 110. When observing along the span direction of the blade body 110, all the leading edge 113 points of the cross-sections are connected into a curve, and all the trailing edge 114 points of the cross-sections are connected into a curve. Correspondingly, in each cross-section, the connection line between the leading edge 113 and the trailing edge 114 is a chord 115, and along the span direction of the blade body 110, the chord length can gradually change. It should be noted that the span direction of the blade body 110 refers to the length direction of the blade body 110 in the radial direction of the wind turbine rotor, 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 disposed on the blade body 110 to reduce the 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 plurality of spacers 122 are arranged at intervals along the span 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. Among them, in the direction parallel to the chord 115, at least a part of the spacer 122 and the reinforcing member 121 are located outside the boundary defined by the chord 115, and there is a spaced space between the reinforcing member 121 and the trailing edge 114. That is to say, in the direction parallel to the chord 115, the reinforcing member 121 and the trailing edge 114 are not connected and 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 a plurality of spacers 122, and the aerodynamic noise is reduced by the noise reducer 120.

[0054] At the same time, the reinforcing member 121 can be connected to at least one spacer 122 to improve the overall strength of the noise reducer 120, prevent it from being broken by aerodynamic loads, improve the static strength and fatigue strength, and extend the service life; the reinforcing member 121 can also be coupled with the flow field of the trailing edge 114 together with the spacers 122 to participate in noise reduction, change the intensity and frequency spectrum structure of the sound source, and transfer more noise energy to areas where the human ear is less sensitive and areas with a high atmospheric dissipation rate, thereby reducing the noise. In particular, the reinforcing member 121 only needs to satisfy the condition that there is a spaced space between it and the trailing edge 114. In this way, the degree of freedom of the external shape design of the reinforcing member 121 can be maximized, and the noise reduction upper limit of the noise reducer 120 can be improved.

[0055] It should be explained that there are multiple chords 115 on the blade body 110. The chord 115 defined here refers to the chord 115 whose extension line passes through the spacers 122 and / or the reinforcing member 121 defined here, or refers to the chord 115 adjacent to the spacers 122 and / or the reinforcing member 121 defined here. That is to say, the chord 115 corresponds to the spacers 122 and the reinforcing member 121. For example, in the cross-sectional schematic diagram of the blade assembly 100 as Figure 3 shown, the chord 115 is unique, the extension line of the chord 115 passes through the spacer 122, and the chord 115 is adjacent to the spacer 122.

[0056] Optionally, the reinforcing member 121 can be connected to a spacer 122, or the reinforcing member 121 can also be connected to at least two spacers 122, so as to connect at least two spacers 122 into one body. The noise reducer 120 in the blade assembly 100 can have only one, that is to say, there can be only one noise reducer 120 on one blade body 110. The noise reducer 120 with a corresponding length can be produced according to the required layout length, so that the installation of the noise reducer 120 can be completed only by one installation operation. Of course, the blade assembly 100 can also have multiple noise reducers 120. The multiple noise reducers 120 are arranged along the span direction of the blade body 110. Thus, the corresponding number of noise reducers 120 can be selected according to the required layout length, and the required length can be achieved by combining multiple noise reducers 120 on one blade body 110.

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

[0058] Exemplarily, the spacer 122 has a first end 1221 and a second end 1222 which are oppositely arranged. In the direction parallel to the chord 115 of the blade body 110, the first end 1221 is located inside the boundary defined by the chord 115, and the second end 1222 extends beyond the trailing edge 114 and is thus located outside the boundary defined by the chord 115. Optionally, the first end 1221 can be directly connected to the blade body 110. For the convenience of the installation operation of several spacers 122, the first ends 1221 of several spacers 122 can be first fixed on the connecting member 123, and then fixed on the blade body 110 through the connecting member 123.

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

[0060] In this embodiment, the noise reducer 120 can further include a connecting member 123. Several spacers 122 are connected to the blade body 110 through the connecting member 123, and the connecting member 123 is arranged at an interval from the reinforcing member 121. In this way, several spacers 122 and the connecting member 123 can be formed into one body in advance. During assembly, they can be integrally installed on the blade body 110, which is convenient for the installation operation and improves the installation efficiency.

[0061] Exemplarily, the connecting member 123 may be configured as a plate, one side of the connecting member 123 is bonded to the blade body 110, and a plurality of spacers 122 are arranged on the end of the blade body 110. Optionally, the plurality of spacers 122 and the connecting member 123 may be integrally designed, such as injection molding, insert molding, casting, etc. The plurality of spacers 122 may also be separately designed from the connecting member 123 and then connected to each other as a whole.

[0062] In order 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, and the positioning member 124 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 an area adjacent to the trailing edge 114. That is to say, during installation, the noise reducer 120 can first determine the installation position by abutting the positioning member 124 against the trailing edge 114 or an area 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 the noise reduction effect.

[0063] As Figure 3 shown, the blade body 110 also has a suction side 116 and a pressure side 117, wherein the suction side 116 and the pressure side 117 extend between the blade root 111 and the blade tip 112. The suction side 116 is the side of the blade body 110 facing away from the wind, with a lower air pressure and generating lift. The pressure side 117 is the side of the blade body 110 facing the wind, with a relatively higher air pressure. In some embodiments, the aforementioned noise reducer 120 may be fixed on the suction side 116.

[0064] In some other embodiments, the aforementioned noise reducer 120 may also be fixed on the pressure side 117. In this way, on the one hand, the pressure on the pressure side 117 can press the noise reducer 120 against the pressure side 117, improving the stability of the noise reducer 120. On the other hand, the acting area of the suction side 116 on the noise reducer 120 is relatively small, reducing the suction force of the suction side 116 on the noise reducer 120 and further improving the connection stability of the noise reducer 120. In this way, 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 characteristics of a 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. Exemplarily, 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. Exemplarily, the main extension line of the spacer 122 may be straight or curved. Taking the main extension line of the spacer 122 being straight 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. Exemplarily, the material of at least part of the spacer 122 is one of plastic, composite material, and porous material.

[0066] In some embodiments, as Figure 5 shown, the cross-sectional dimensions of at least part of the spacer 122 may be gradually changing. Exemplarily, the cross-sectional dimensions of at least part of the spacer 122 gradually decrease from the first end 1221 to the second end 1222 of the spacer 122. In this way, while controlling the overall weight of the noise reducer 120, it is possible to ensure that the root of the spacer 122 is thick enough to avoid the spacer 122 from being broken and damaged, and improve the service life.

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

[0068] In the noise reducer 120, the first spacer 122 along the span 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 centroids of the first end 1221 and the second end 1222 of the first spacer is the first connection line, the line connecting the centroids of the first end 1221 and the second end 1222 of the second spacer is the second connection line, the line connecting the centroids of the first ends 1221 of all the spacers 122 is the third connection line, and the line connecting the centroids of the second ends 1222 of all the spacers 122 is the fourth connection line 1226. In some embodiments, as Figure 5 shown, the plane formed by surrounding the first connection line 1223, the second connection line 1224, the third connection line 1225, and the fourth connection line 1226 is a plane. In other words, the plurality of spacers 122 are arranged in a straight line, thus facilitating production operations.

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

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

[0071] The aforementioned reinforcing member 121 can be constructed into any shape. Specifically, Figure 6 from the top-down perspective shown, the reinforcing member 121 can be circular, triangular, quadrilateral, teardrop-shaped or any other shape.

[0072] Taking the case where the reinforcing member 121 is constructed as a quadrilateral from the top-down perspective of the noise reducer 120 as an example, as Figure 6 and Figure 9 shown, the reinforcing member 121 has a first side 1211, a second side 1212, a third side 1213 and a fourth side 1214 that are connected in sequence. Among them, the first side 1211 and the third side 1213 are parallel to each other, and there is a preset angle α between both the first side 1211 and the third side 1213 and the center line of the spacer 122. Among them, the preset angle α is an acute angle and less than 45°. In this way, when the 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 reinforcing members 121.

[0074] In some embodiments, as Figure 6 shown, each noise reducer 120 has at least two reinforcing members 121, and there are two adjacent reinforcing members 121 that are symmetric about the gap between two adjacent spacers 122 and are arranged in a substantially V shape, and the opening of the V shape faces the blade body 110. It can be understood that the V shape formed by surrounding the two reinforcing members 121 can form a serrated structure on both the inner and outer sides, so that the serrated structure can be used to more effectively break up large-scale eddies and shift the sound frequency to the area insensitive to the human ear, reducing noise.

[0075] Exemplarily, the reinforcing member 121 can be separately designed from several spacers 122, and the reinforcing member 121 is connected to several spacers 122 in an embedded manner. The reinforcing member 121 can also be integrally designed with several spacers 122 by injection molding, sleeving, casting or 3D printing.

[0076] According to another aspect of the present disclosure, a noise reducer 120 is also provided. As Figure 5 and Figure 6As shown, the noise reducer 120 may at least include a connecting member 123, a plurality of spacer members 122, and a reinforcing member 121. Among them, the connecting member 123 is used to connect to the blade body 110. The plurality of spacer members 122 are connected to the connecting member 123, and the plurality of spacer members 122 are arranged at intervals along a preset direction. The reinforcing member 121 is connected to at least one spacer member 122, and there is a spaced space between the reinforcing member 121 and the connecting member 123. Wherein, when the noise reducer 120 is connected to the blade body 110, the preset direction is the span direction of the blade body 110.

[0077] Further, the noise reducer 120 may further include a positioning member 124. The positioning member 124 is connected to the connecting member 123, and 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 plurality of spacer members 122 may be the same or different; and / or,

[0079] The cross-sectional shape of at least some of the spacer members 122 is one of a rectangle, a circle, a triangle, and an ellipse; and / or,

[0080] The cross-sectional dimension of at least some of the spacer members 122 gradually decreases from the first end 1221 of the spacer member 122 to the second end of the spacer member 122; and / or,

[0081] The material of at least some of the spacer members 122 is one of plastic, composite material, and porous material.

[0082] It should be noted that for the specific structures of the connecting member 123, the plurality of spacer members 122, and the reinforcing member 121, reference may be made to the content detailed in the above embodiments, and details will not be described herein again.

[0083] Among them, the terms "upper", "lower", etc. used in the present disclosure are used to describe the relative positional relationship of each structure in the drawings, and are only for the convenience of description and clarity, rather than to limit the scope of implementation of the present disclosure. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present disclosure.

[0084] It should be noted that: in the present disclosure, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0085] In addition, in this disclosure, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0086] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this disclosure. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any 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 of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements 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 blade assembly, characterized in that, The blade assembly (100) includes: A blade body (110) having a blade root (111), a blade tip (112), a leading edge (113) and a trailing edge (114), wherein the leading edge (113) and the trailing edge (114) extend between the blade root (111) and the blade tip (112); A noise reducer (120) disposed on the blade body (110), the noise reducer (120) including at least one reinforcing member (121) and a plurality of spacers (122), the plurality of spacers (122) being arranged at intervals in the spanwise direction of the blade body (110), the reinforcing member (121) being connected to at least one of the spacers (122), and the reinforcing member (121) and the spacers (122) being arranged adjacent to the trailing edge (114); Wherein, in a direction parallel to the chord (115) of the blade body (110), at least a part of the spacer (122) and the reinforcing member (121) are located outside the boundary defined by the chord (115), and there is a spaced space between the reinforcing member (121) and the trailing edge (114).

2. The blade assembly according to claim 1, characterized in that, In a direction parallel to the chord (115) of the blade body (110), a part of the spacer (122) is located outside the boundary defined by the chord (115).

3. The blade assembly according to claim 2, wherein The spacer (122) has a first end (1221) and a second end (1222), wherein, in a direction parallel to the chord (115) of the blade body (110), the first end (1221) is located inside the boundary defined by the chord (115), and the second end (1222) extends beyond the trailing edge (114).

4. The blade assembly according to claim 1, wherein 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).

5. The blade assembly according to claim 4, wherein The noise reducer (120) further includes a connecting member (123), the plurality of spacers (122) being connected to the blade body (110) through the connecting member (123), and the connecting member (123) being spaced from the reinforcing member (121).

6. The blade assembly according to claim 5, wherein, The noise reducer (120) further includes a positioning member (124), the positioning member (124) being 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).

7. The blade assembly according to any one of claims 1 to 6, characterized in that, In the noise reducer (120), the first spacer (122) along the span 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) and the centroid of the second end (1222) of the first spacer is the first connection line (1223). The line connecting the centroid of the first end (1221) and the centroid of the second end (1222) of the second spacer is the second connection line (1224). The line connecting the centroids of the first ends (1221) of all the spacers (122) is the third connection line (1225). The line connecting the centroids of the second ends (1222) of all the spacers (122) is the fourth connection line (1226). Among them, the first connection line (1223), the second connection line (1224), the third connection line (1225) and the fourth connection line (1226) are connected to form a three-dimensional surface (β).

8. The blade assembly according to any one of claims 1 to 6, characterized in that, Viewed from the top view of the noise reducer (120), the reinforcing member (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) that are connected in sequence. The first side (1211) and the third side (1213) are parallel to each other and have a preset included angle with the center line of the spacer (122).

9. The blade assembly according to claim 8, characterized in that, The range of the preset included angle is less than 45°.

10. The blade assembly according to claim 8, wherein, There are at least two of the reinforcing members (121). Two adjacent reinforcing members (121) are symmetric about the gap between two adjacent spacers (122) and are arranged in a substantially V shape with the opening facing the blade body (110).

11. The blade assembly according to claim 1, characterized in that, The cross-sectional shapes of several spacers (122) can be the same or different; and / or, The cross-sectional shape of at least part of the spacers (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 spacers (122) gradually decreases from the first end (1221) to the second end (1222) of the spacer (122); and / or, The material of at least part of the spacers (122) is one of plastic, composite material and porous material.

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

13. The blade assembly according to claim 1, wherein, The blade body (110) also 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 turbine, characterized in that, The wind turbine at least includes the blade assembly (100) according to any one of claims 1 to 13.

15. A noise reducer, characterized in that, The noise reducer (120) at least includes: A connecting member (123) for connecting to the blade body (110); A plurality of spacers (122) connected to the connecting member (123) and arranged at intervals along a preset direction; The reinforcement member (121) is connected to at least one of the spacers (122), and there is a spaced-apart space between the reinforcement member (121) and the connecting member (123).

16. The noise reducer according to claim 15, characterized in that, The noise reducer (120) further includes a positioning member (124) connected to the connecting member (123), and the positioning member (124) is configured to abut against the trailing edge (114) when the noise reducer (120) is connected to the blade body (110); and / or, The cross-sectional shapes of several of the spacers (122) may be the same or different; and / or, The cross-sectional shape of at least part of the spacers (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 spacers (122) gradually decreases from the first end (1221) of the spacers (122) to the second end (1222) of the spacers (122); and / or, The material of at least part of the spacers (122) is one of plastic, composite material, and porous material.

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