Wind turbine blade, wind power generator set and wind turbine blade manufacturing method

Abstract

The application relates to a wind power blade, a wind turbine generator and a wind power blade manufacturing method. The wind power blade comprises a blade and an elastic capsule. The blade comprises a pressure surface and a suction surface arranged oppositely along a thickness direction, and a leading edge and a trailing edge arranged oppositely along a width direction. The pressure surface comprises a first region between the maximum thickness of the blade and the leading edge, and a second region between the maximum thickness of the blade and the trailing edge. The elastic capsule comprises an inner cavity, a first capsule sheet and a second capsule sheet. The inner cavity is arranged between the first capsule sheet and the second capsule sheet. The first capsule sheet is connected to at least one of the first region and the second region. The second capsule sheet is located on a side of the first capsule sheet away from the pressure surface. The elastic capsule is configured to switch between an expanded state and a contracted state. During the switching between the expanded state and the contracted state, the second capsule sheet moves away from or close to the first capsule sheet, so that the volume of the inner cavity of the elastic capsule increases or decreases.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a wind power blade, a wind turbine generator and a wind power blade manufacturing method. BACKGROUND

[0002] In recent years, wind energy as a large-scale commercial clean renewable energy has been widely concerned by countries. With the rapid development of the wind power industry, wind power blades are becoming larger and larger. The wind power blade is a core component of a wind turbine for capturing wind energy, and its operating state is directly related to the utilization efficiency of wind energy. In the development of wind power generation technology, how to improve the operating safety of the wind power blade has become a research focus. SUMMARY

[0003] The present application provides a wind power blade, a wind turbine generator and a wind power blade manufacturing method, which are beneficial to improve the operating safety of the wind power blade.

[0004] The present application provides a wind power blade, which comprises a blade and an elastic capsule.

[0005] The blade comprises a pressure surface and a suction surface arranged opposite along a thickness direction, and a leading edge and a trailing edge arranged opposite along a width direction. The pressure surface comprises a first region between the maximum thickness of the blade and the leading edge, and a second region between the maximum thickness of the blade and the trailing edge. The elastic capsule comprises an inner cavity, a first capsule piece and a second capsule piece. The inner cavity is arranged between the first capsule piece and the second capsule piece. The first capsule piece is connected to at least one of the first region and the second region. The second capsule piece is located on a side of the first capsule piece away from the pressure surface. The elastic capsule is configured to switch between an expanded state and a contracted state. During the switching between the expanded state and the contracted state, the second capsule piece moves away from or approaches the first capsule piece, so as to increase or reduce the volume of the inner cavity of the elastic capsule.

[0006] The wind power blade of the present application comprises a blade and an elastic capsule. In the case of a gust with a large wind speed or an extreme wind condition with a large wind speed, the aerodynamic shape of the wind power blade is adjusted by adjusting the volume of the elastic capsule, so as to reduce the lift borne by the blade, realize blade load reduction, reduce the structural stress and deformation amount of the blade, and reduce the possibility of damage to the blade structure caused by overloading of the blade in a high-turbulence and high-shear wind condition, which is beneficial to improve the operating safety and environmental adaptability of the wind power blade, and prolong the service life of the wind power blade.

[0007] In some possible implementations, at least part of the inner wall of the elastic capsule is a non-smooth surface.

[0008] The inner wall of the elastic capsule is at least partially a non-smooth surface, so that the inner wall of the elastic capsule is less likely to stick to or block the fluid outlet during the discharge of the fluid, and the elastic capsule is more likely to quickly empty the fluid in the elastic capsule and improve the deformation rate of the elastic capsule.

[0009] In some possible implementations, the elastic capsule further includes an elastic partition wall located in the inner cavity, the first capsule piece and the second capsule piece are connected to the elastic partition wall, and the elastic partition wall is stretched or shrunk when the second capsule piece is away from or close to the first capsule piece. The inner cavity is divided into two or more sub-chambers by the elastic partition wall, the elastic partition wall includes a fluid passage, and the sub-chambers on both sides of the elastic partition wall are connected by the fluid passage.

[0010] During the switching process of the elastic capsule from the contracted state to the expanded state, the second capsule piece is away from the first capsule piece, and the second capsule piece applies a tensile stress to the elastic partition wall to stretch the elastic partition wall. During the deformation of the second capsule piece, the elastic partition wall can constrain the second capsule piece, so that the shape of the deformed second capsule piece meets the shape requirement by using the elastic partition wall, and the possibility that the overall shape of the elastic capsule does not meet the expected shape due to the free deformation of the second capsule piece is reduced. During the switching process of the elastic capsule from the expanded state to the contracted state, the second capsule piece is close to the first capsule piece, and the second capsule piece releases the elastic partition wall. Under the action of the elastic recovery force, the elastic partition wall applies a tensile stress to the second capsule piece. Under the joint action of the elastic recovery force of the second capsule piece and the elastic recovery force of the elastic partition wall, the second capsule piece relatively quickly switches from the expanded state to the contracted state, which is beneficial to improve the deformation rate of the elastic capsule, improve the response rate of the elastic capsule, and is beneficial to the elastic capsule to complete the shape adjustment in a relatively short time, so that the wind power blade adjusts the aerodynamic performance in a relatively short time.

[0011] In some possible implementations, the number of elastic partition walls is two or more, and the two or more elastic partition walls are arranged at intervals along the length direction or the width direction of the blade. Each elastic partition wall has one sub-chamber on each side. The two or more elastic partition walls are distributed at different positions in the inner cavity. During the deformation of the second capsule piece, the two or more elastic partition walls can constrain the second capsule piece at different positions, which is beneficial to further accurately control the shape of the deformed second capsule piece to meet the shape requirement.

[0012] In some possible implementations, the elastic partition wall is connected to the first capsule piece to form a first connection region, the elastic partition wall is connected to the second capsule piece to form a second connection region, and the orthographic projection of the first connection region and the orthographic projection of the second connection region do not overlap in the direction perpendicular to the pressure surface.

[0013] When the elastic capsule is in the contracted state, the first connecting region and the second connecting region are arranged staggeredly and do not correspond to each other, so that the first capsule piece, the elastic partition wall and the second capsule piece are in a mutually stacked state, which is conducive to reducing the possibility that the second capsule piece protrudes too high in the area corresponding to the elastic partition wall due to the local cushioning of the second capsule piece by the elastic partition wall, and reducing the possibility that the aerodynamic shape of the wind turbine blade is adversely affected due to the local over-protrusion of the second capsule piece.

[0014] In some possible implementations, the blade includes a blade root and a blade tip arranged oppositely along a length direction, and the two or more sub-chambers are arranged at intervals along a width direction of the blade, and the elastic partition wall extends along the length direction of the blade, and the fluid channel is arranged at an end of the elastic partition wall close to the blade tip. The aerodynamic shape of the wind turbine blade is adjusted by the elastic capsule in a rotating state of the wind turbine blade. The fluid channel is arranged at the end of the elastic partition wall close to the blade tip, so that in the rotating state of the wind turbine blade, the fluid medium in the inner cavity of the elastic capsule relatively quickly fills or discharges each sub-chamber through the fluid channel under the action of centrifugal force, which is conducive to improving the response rate and deformation rate of the shape change of the elastic capsule.

[0015] In some possible implementations, the first capsule piece, the second capsule piece and the elastic partition wall are integrally formed. The first capsule piece, the second capsule piece and the elastic partition wall form an integral structure. The connection strength between the first capsule piece, the second capsule piece and the elastic partition wall is relatively large, so that the structural strength of the first capsule piece, the second capsule piece and the elastic partition wall at the first connecting region and the second connecting region is relatively large, the impact resistance and fatigue resistance of the first connecting region and the second connecting region are improved, the possibility that at least one of the first connecting region and the second connecting region is prone to cracking or breaking due to the alternating stress borne by the reciprocating movement of the second capsule piece is reduced, and the service life of the elastic capsule is prolonged.

[0016] In some possible implementations, the elastic capsule includes a sealing edge surrounding the inner cavity, the first capsule piece and the second capsule piece are connected with the sealing edge respectively, the sealing edge is connected with the pressure surface, and the thickness of the sealing edge gradually decreases in a direction away from the inner cavity. The elastic capsule is connected with the pressure surface through the first capsule piece and the sealing edge, the connection area between the elastic capsule and the pressure surface is increased, the connection strength and stability between the elastic capsule and the pressure surface are improved, and the possibility that the elastic capsule separates from the blade due to the reciprocating expansion or contraction of the elastic capsule is reduced. The thickness of the sealing edge gradually decreases in the direction away from the inner cavity, so that the sealing edge and the pressure surface can be smoothly transitioned, and the possibility that the shape of the sealing edge adversely affects the aerodynamic shape of the wind turbine blade is reduced.

[0017] In some possible implementation manners, the wind power blade further comprises an adhesive member, and the first bladder piece and the sealing edge are adhered to the pressure surface through the adhesive member. The first bladder piece and the sealing edge are respectively connected and fixed to the pressure surface in an adhesive manner, which is conducive to reducing the difficulty of connecting the elastic bladder body to the blade, and does not need to additionally provide a connecting structure on the elastic bladder body and the blade, thereby reducing the processing difficulty of the elastic bladder body and the blade.

[0018] In some possible implementation manners, the wind power blade further comprises a protective member, the protective member is arranged around the sealing edge, and at least one of the sealing edge, the adhesive member and the pressure surface is connected to the protective member, and the protective member covers the outer side surface of the sealing edge and the outer side surface of the adhesive member.

[0019] The protective member can protect the sealing edge and the adhesive member from the outside, which is conducive to blocking water, sunlight and other substances, preventing the adhesive member from aging, deforming or failing, and reducing the possibility of connection failure between the sealing edge and the adhesive member and connection failure between the adhesive member and the pressure surface.

[0020] In some possible implementation manners, the adhesive member comprises an annular adhesive portion and a strip-shaped adhesive portion, the strip-shaped adhesive portion is located in the annular adhesive portion, the first bladder piece is adhered to the strip-shaped adhesive portion, and the sealing edge is adhered to the annular adhesive portion. The elastic bladder body is adhered and fixed to the pressure surface through the annular adhesive portion and the strip-shaped adhesive portion. The adhesive member comprises the annular adhesive portion and the strip-shaped adhesive portion, which is conducive to reducing the amount of adhesive used and reducing costs while ensuring the connection strength.

[0021] In some possible implementation manners, the width of the sealing edge ranges from 30 mm to 50 mm.

[0022] The width of the sealing edge ranges from 30 mm to 50 mm, which is conducive to ensuring that the sealing edge has good structural strength, ensuring that the sealing edge and the pressure surface have a large connection area, improving the connection strength between the sealing edge and the pressure surface, and realizing a smooth transition between the sealing edge and the pressure surface.

[0023] In some possible implementation manners, the surface of the sealing edge away from the pressure surface is a slope, and the slope has a slope value ranging from 1:50 to 1:10, which is conducive to realizing a smooth transition between the sealing edge and the pressure surface and reducing the possibility that the shape of the sealing edge adversely affects the aerodynamic shape of the wind power blade.

[0024] In some possible implementation manners, the first bladder piece, the second bladder piece and the sealing edge are an integrally formed structure.

[0025] The first capsule, the second capsule and the edge band form an integral structure. The connection strength between the first capsule, the second capsule and the edge band is relatively large, so that the structural strength of the first capsule, the second capsule and the edge band at the connection area is relatively large, the impact resistance and fatigue resistance of the connection area are improved, the possibility of cracks or fractures caused by the alternating stress borne by the connection area due to the reciprocating movement of the second capsule is reduced, and the service life of the elastic capsule body is prolonged.

[0026] In some implementable manners, two or more elastic capsule bodies are arranged along the length direction of the blade. The two or more elastic capsule bodies can be used to more flexibly adjust the aerodynamic shape of the wind power blade, so as to adjust the aerodynamic performance of the wind power blade, and improve the ability to adjust and optimize the aerodynamic performance of the wind power blade.

[0027] In some implementable manners, the two or more elastic capsule bodies are arranged at intervals along the length direction of the blade. There is a spacing between any two adjacent elastic capsule bodies. On the one hand, there is no positional interference between any two adjacent elastic capsule bodies, so that each elastic capsule body is easy to install and fix on the pressure surface. On the other hand, it is beneficial to prevent the mutual extrusion between any two adjacent second capsules when the second capsules expand, and reduce the possibility that the shape of each elastic capsule body does not conform to the expected shape due to the mutual extrusion of the second capsules.

[0028] In some implementable manners, the spacing between any two adjacent elastic capsule bodies along the length direction of the blade is 5-10 mm.

[0029] In some implementable manners, a protective coating is arranged on the exposed surface of the elastic capsule body.

[0030] The protective coating can protect the elastic capsule body, prevent water or sunlight and other substances from entering, prevent the elastic capsule body from aging and failure, and prolong the service life of the elastic capsule body.

[0031] In some implementable manners, the material of the elastic capsule body comprises an ultraviolet absorber.

[0032] The ultraviolet absorber can efficiently absorb ultraviolet rays in sunlight, reduce the damage of ultraviolet rays to the elastic capsule body, and prolong the service life of the elastic capsule body.

[0033] In some implementable manners, the material of the elastic capsule body comprises a fiber material, so as to increase the structural strength of the elastic capsule body, improve the fatigue resistance of the elastic capsule body, and prolong the service life of the elastic capsule body.

[0034] In some feasible embodiments, the blade includes a hollow chamber, and the wind turbine blade also includes a fluid distribution device, at least partially located within the hollow chamber, connected to an elastic bladder, and in communication with the inner cavity.

[0035] The fluid distribution device can reuse the hollow chamber of the blade to improve the space utilization of the hollow chamber and reduce the difficulty of arranging the fluid distribution device.

[0036] In some feasible embodiments, the elastic bladder includes a fluid inlet and a fluid outlet disposed on the first bladder, the fluid inlet and the fluid outlet communicating with the inner cavity, the blade includes a first through hole and a second through hole penetrating the pressure surface, and the wind turbine blade also includes a fluid distribution device, the fluid distribution device including an input line, an output line, a first valve and a second valve, the input line and the output line passing through the first through hole and the second through hole respectively and connected to the fluid inlet and the fluid outlet, and the first valve and the second valve being configured to control the input line and the output line to be open or closed.

[0037] The design of providing a first and second through-hole on the blade allows the elastic bladder and fluid distribution device to be connected via input and output pipelines, reducing the difficulty of connecting the elastic bladder and fluid distribution device. After the first bladder plate is connected to the pressure surface, it can cover the first and second through-holes, thus protecting them and reducing the possibility of debris or water entering the blade interior through the first and second through-holes.

[0038] In some feasible embodiments, the blade includes a blade root and a blade tip arranged opposite each other along the length direction, with the fluid inlet located near the blade root and the fluid outlet located near the blade tip along the length direction of the blade.

[0039] The aerodynamic shape of the wind turbine blade is adjusted by an elastic bladder while the blade is rotating. During this rotation, the fluid medium, introduced into the cavity of the elastic bladder through the fluid inlet, can fill the cavity relatively quickly under centrifugal force, which helps to improve the response rate and deformation rate of the elastic bladder during expansion.

[0040] When the wind turbine blade is rotating, the fluid medium in the inner cavity of the elastic bladder can be discharged from the fluid outlet relatively quickly under the action of centrifugal force, which is beneficial to improving the response rate and deformation rate of the shape change during the contraction process of the elastic bladder.

[0041] In some possible implementation manners, the elastic bladder includes a fluid inlet and outlet arranged on the first bladder sheet, the fluid inlet and outlet are in communication with the inner cavity, the blade includes a through hole penetrating the pressure surface, and the wind turbine blade further includes a fluid distribution device, the fluid distribution device includes a pipeline and a valve, the pipeline penetrates the through hole and is connected with the fluid inlet and outlet, and the valve is configured to control the pipeline to be turned on or turned off.

[0042] The elastic bladder fills or discharges the fluid medium through the fluid inlet and outlet, which is beneficial to reduce the number of openings on the elastic bladder and the number of through holes arranged on the blade, and reduce the possibility of adversely affecting the structural strength of the blade due to a large number of through holes arranged on the blade.

[0043] The application provides a wind turbine generator.

[0044] The application provides a manufacturing method of a wind turbine blade.

[0045] The blade includes a pressure surface and a suction surface arranged opposite to each other in a thickness direction, a leading edge and a trailing edge arranged opposite to each other in a width direction, the pressure surface includes a first region between the maximum thickness of the blade and the leading edge and a second region between the maximum thickness of the blade and the trailing edge.

[0046] The elastic bladder includes an inner cavity, a first bladder sheet and a second bladder sheet, the inner cavity is arranged between the first bladder sheet and the second bladder sheet, the first bladder sheet is connected to at least one of the first region and the second region, and the second bladder sheet is located on a side of the first bladder sheet away from the pressure surface.

[0047] In some possible implementation manners, the manufacturing method of the wind turbine blade includes:

[0048] A strip-shaped adhesive part is arranged on the pressure surface.

[0049] A ring-shaped adhesive part is arranged along an edge of the elastic bladder.

[0050] The elastic bladder is attached to the pressure surface, and the elastic bladder and the pressure surface are connected through the strip-shaped adhesive part and the ring-shaped adhesive part.

[0051] Pressure stress is applied to the elastic bladder.

[0052] After the strip-shaped adhesive part and the ring-shaped adhesive part are cured, the pressure stress applied to the elastic bladder is stopped.

[0053] The wind power blade, the wind turbine generator set and the wind power blade manufacturing method of the present application have the following beneficial effects: in the gust of large wind speed or the extreme wind condition of large wind speed, the aerodynamic shape of the wind power blade is adjusted by adjusting the volume size of the elastic bag body, so as to reduce the lift borne by the blade, realize the load reduction of the blade, reduce the structural stress and deformation amount of the blade, and reduce the possibility of damage to the structure of the blade due to overloading of the blade in the high turbulence and high shear wind condition, thereby being beneficial to improving the operation safety, environmental adaptability and service life of the wind power blade. BRIEF DESCRIPTION OF DRAWINGS

[0054] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0055] Figure 1 The structural schematic diagram of the wind turbine generator set provided for some embodiments of the present application is shown in the figure.

[0056] Figure 2 The partial structural schematic diagram of the wind power blade provided for some embodiments of the present application is shown in the figure.

[0057] Figure 3 The partial cross-sectional structural schematic diagram of the wind power blade in the first state provided for some embodiments of the present application is shown in the figure.

[0058] Figure 4 The partial cross-sectional structural schematic diagram of the wind power blade in the second state provided for some embodiments of the present application is shown in the figure.

[0059] Figure 5 The partial cross-sectional structural schematic diagram of the wind power blade in the second state provided for some embodiments of the present application is shown in the figure. Figure 4 The enlarged schematic diagram of the middle M is shown in the figure.

[0060] Figure 6 The partial cross-sectional structural schematic diagram of the elastic bag body in the inflated state provided for some embodiments of the present application is shown in the figure.

[0061] Figure 7 The partial cross-sectional structural schematic diagram of the elastic bag body in the inflated state provided for some embodiments of the present application is shown in the figure.

[0062] Figure 8 The partial cross-sectional structural schematic diagram of the elastic bag body in the contracted state provided for some embodiments of the present application is shown in the figure.

[0063] Figure 9 The partial cross-sectional structural schematic diagram of the elastic bag body including the elastic partition wall provided for some embodiments of the present application is shown in the figure.

[0064] Figure 10 The partial structural schematic diagram of the elastic bag body including the fluid inlet and the fluid outlet in the same sub-chamber provided for some embodiments of the present application is shown in the figure.

[0065] Figure 11 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0066] Figure 12 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder; Figure 11 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0067] Figure 13 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0068] Figure 14 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0069] Figure 15 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0070] Figure 16 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0071] Figure 17 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0072] Figure 18 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder;

[0073] Figure 19 A wind turbine blade according to some embodiments of the present application comprises a partial cross-sectional view of a wind turbine blade and a partial cross-sectional view of a connection between the wind turbine blade and an elastic bladder.

[0074] In the drawings, the drawings are not necessarily drawn to scale.

[0075] Legend of reference signs:

[0076] 10, wind turbine generator set; 20, tower; 30, nacelle; 40, wind wheel; 50, hub; 60, wind power blade; 70, blade; 701, hollow chamber; 702, first through hole; 703, second through hole; 704, through hole; 71, pressure surface; 711, first area; 712, second area; 72, suction surface; 73, leading edge; 74, trailing edge; 75, blade root; 76, blade tip; 80, elastic bag body; 801, inner cavity; 802, sub-chamber; 803, first connecting area; 804, second connecting area; 805, fluid inlet; 806, fluid outlet; 807, fluid inlet and outlet; 81, first bag piece; 82, second bag piece; 83, elastic partition wall; 831, fluid channel; 84, edge sealing; 85, protective coating; 90, adhesive; 91, annular adhesive part; 92, strip-shaped adhesive part; 100, protective member; 110, fluid distribution device; 111, input pipeline; 112, output pipeline; 113, first valve; 114, second valve; 115, pipeline; 116, valve; X, thickness direction; Y, width direction; Z, length direction. DETAILED DESCRIPTION

[0077] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0079] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to the other embodiments.

[0080] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connection", "attach" and "attachment" should be construed broadly and, for example, can be fixed connection, or detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0082] "Multiple" appearing in the present application refers to two or more (including two).

[0083] Referring to Figure 1 As shown in the drawings, the embodiments of the present application provide a wind turbine generator set 10. The wind turbine generator set 10 includes a tower 20, a nacelle 30 and a wind wheel 40. The nacelle 30 is arranged at the top of the tower 20. The wind wheel 40 includes a hub 50 and a wind power blade 60. The wind power blade 60 is connected to the hub 50. The hub 50 is connected to the main shaft of the nacelle 30. The wind power blade 60 can generate torque under the action of wind. The wind power blade 60 and the hub 50 drive the main shaft of the nacelle 30 to rotate, so as to convert wind energy into mechanical energy. The main shaft of the nacelle 30 can be connected to the rotor of a generator, so as to convert mechanical energy into electrical energy.

[0084] Referring to Figures 2 to 5 As shown in the drawings, the embodiments of the present application provide a wind power blade 60. The wind power blade 60 includes a blade 70 and an elastic capsule 80. The blade 70 includes a pressure surface 71 and a suction surface 72 oppositely arranged along a thickness direction X, and a leading edge 73 and a trailing edge 74 oppositely arranged along a width direction Y. The pressure surface 71 includes a first region 711 between the maximum thickness of the blade 70 and the leading edge 73, and a second region 712 between the maximum thickness of the blade 70 and the trailing edge 74. The elastic capsule 80 includes an inner cavity 801, a first capsule sheet 81 and a second capsule sheet 82. The inner cavity 801 is arranged between the first capsule sheet 81 and the second capsule sheet 82. The first capsule sheet 81 is connected to at least one of the first region 711 and the second region 712. The second capsule sheet 82 is located on the side of the first capsule sheet 81 away from the pressure surface 71. The elastic capsule 80 is configured to switch between an expanded state and a contracted state. During the switching between the expanded state and the contracted state, the second capsule sheet 82 moves away from or approaches the first capsule sheet 81, so as to increase or reduce the volume of the inner cavity 801 of the elastic capsule 80.

[0085] In the embodiments of the present application, the maximum thickness of the blade 70 refers to the position where the perpendicular distance between the suction surface 72 and the pressure surface 71 is the largest along the thickness direction X in the cross section of the blade 70 perpendicular to the length direction Z.

[0086] In the embodiments of the present application, the pressure surface 71 of the blade 70 also serves as the windward surface, and the suction surface 72 also serves as the leeward surface. The pressure surface 71 and the suction surface 72 are connected at the leading edge 73 and the trailing edge 74. The blade 70 is a structure with uneven thickness. The thickness of the blade 70 changes in the direction from the leading edge 73 to the trailing edge 74. The blade 70 has a maximum thickness between the leading edge 73 and the trailing edge 74. The pressure surface 71 has a highest point at the maximum thickness of the blade 70. The thickness of the blade 70 decreases from the maximum thickness to the leading edge 73. The thickness of the blade 70 decreases from the maximum thickness to the trailing edge 74.

[0087] The first region 711 and the second region 712 of the pressure surface 71 are arranged along the width direction Y. The first region 711 and the second region 712 of the pressure surface 71 are directly connected at the maximum thickness of the blade 70. The first region 711 and the second region 712 are smoothly connected.

[0088] In the embodiments of the present application, the first capsule 81 is connected to the first region 711. Alternatively, the first capsule 81 is connected to the second region 712. Alternatively, part of the first capsule 81 is connected to the first region 711, and the other part is connected to the second region 712.

[0089] In some possible implementation manners, Figures 3 to 5 The structure in which the elastic capsule 80 is connected to the second region 712 is schematically shown.

[0090] In the embodiments of the present application, the elastic capsule 80 itself has an elastic deformation performance. When the inner cavity 801 of the elastic capsule 80 is filled with a fluid medium, the elastic capsule 80 can switch from a contracted state to an expanded state. When the fluid medium is discharged from the inner cavity 801 of the elastic capsule 80, the elastic capsule 80 can switch from the expanded state to the contracted state. Exemplarily, the fluid medium can be air or liquid.

[0091] In the embodiments of the present application, referring to Figure 3 As shown in the figure, when the elastic capsule 80 is not filled with a fluid medium and is in a contracted state, the elastic capsule 80 can have a flat structure. The first capsule 81 and the second capsule 82 are stacked with each other, and the volume of the inner cavity 801 is in a minimum state. The elastic capsule 80 can be attached to the surface of the blade 70, and the shape of the elastic capsule 80 has little or no influence on the overall aerodynamic shape of the wind power blade 60, so that the aerodynamic performance of the blade 70 can remain the original aerodynamic performance.

[0092] Referring to Figure 4 andFigure 5 As shown, when the elastic bladder 80 is filled with fluid medium and in the inflated state, the second bladder sheet 82 is away from the first bladder sheet 81, the volume of the inner cavity 801 is increased, and the shape of the elastic bladder 80 is changed. The shape of the elastic bladder 80 affects the overall aerodynamic shape of the wind power blade 60, so that the overall aerodynamic shape of the wind power blade 60 is changed, thereby reducing the lift carried by the blade 70 and achieving the load reduction of the blade 70. When the load of the blade 70 is reduced, the structural stress and deformation of the blade 70 are reduced.

[0093] In some possible implementations, the thickness of the first bladder sheet 81 ranges from 1 mm to 2 mm. For example, the thickness of the first bladder sheet 81 can be 1 mm, 1.5 mm, or 2 mm. The thickness of the second bladder sheet 82 ranges from 1 mm to 2 mm. For example, the thickness of the second bladder sheet 82 can be 1 mm, 1.5 mm, or 2 mm.

[0094] The wind power blade 60 of the embodiment of the present application includes the blade 70 and the elastic bladder 80. The wind turbine generator set 10 can adjust the aerodynamic shape of the wind power blade 60 by adjusting the volume of the elastic bladder 80 according to the changes in wind speed and wind direction, so as to optimize the energy capture efficiency of the wind power blade 60 and improve the overall power generation efficiency of the wind turbine generator set 10. In the gust of large wind speed or extreme wind condition of large wind speed, the aerodynamic shape of the wind power blade 60 is adjusted by adjusting the volume of the elastic bladder 80, so as to reduce the lift carried by the blade 70 and achieve the load reduction of the blade 70, reduce the structural stress and deformation of the blade 70, and reduce the possibility of structural damage of the blade 70 due to overloading of the blade 70 in the high-turbulence and high-shear wind condition, so as to improve the operation safety and environmental adaptability of the wind power blade 60 and prolong the service life of the wind power blade 60. In addition, the wind turbine generator set 10 can simultaneously reduce the load of the blade 70 by the pitch change mode of the wind power blade 60 and the shape change mode of the elastic bladder 80, so as to reduce the possibility of overloading of the blade 70 due to pitch change lag in the pitch change mode of the wind power blade 60.

[0095] When the elastic bladder 80 arranged on the pressure surface 71 is in the contracted state, the shape of the elastic bladder 80 has little or no effect on the overall aerodynamic shape of the wind power blade 60, so that the aerodynamic performance of the blade 70 can remain the original aerodynamic performance. When air flows through the blade 70, due to the design of the overall aerodynamic shape of the blade 70, the air can generate a relatively high pressure on the pressure surface 71 and a relatively low pressure on the suction surface 72. When the blade 70 operates, the air flows on the pressure surface 71. The air has a relatively slow flow rate and a relatively high pressure on the pressure surface 71. The air has a relatively fast flow rate and a relatively low pressure on the suction surface 72.

[0096] When the elastic bag 80 arranged at the pressure surface 71 is in the expanded state, the overall aerodynamic shape of the wind turbine blade 60 formed by the blade 70 and the elastic bag 80 changes, thereby reducing the pressure of air on the windward surface of the wind turbine blade 60, achieving overall load reduction of the wind turbine blade 60, and further achieving load reduction of the blade 70.

[0097] In the embodiments of the present application, the load borne by the wind turbine blade 60 as a whole can be controlled by controlling the shape change of the elastic bag 80 arranged at the pressure surface 71.

[0098] In some implementable manners, the elastic bag 80 is connected to the second region 712. When the elastic bag 80 is in the expanded state, the second bag piece 82 does not exceed the maximum thickness of the blade 70 along the thickness direction X of the blade 70.

[0099] In some implementable manners, the elastic bag 80 is a structure manufactured independently. The elastic bag 80 and the blade 70 are in a split structure. The elastic bag 80 can be assembled with the blade 70 to form the wind turbine blade 60.

[0100] In some examples, the elastic bag 80 is adhesively fixed to the pressure surface 71. For example, the elastic bag 80 is adhesively fixed to the first region 711 of the pressure surface 71. Alternatively, the elastic bag 80 is adhesively fixed to the second region 712 of the pressure surface 71. Alternatively, a part of the elastic bag 80 is adhesively fixed to the first region 711, and another part is adhesively fixed to the second region 712.

[0101] In some implementable manners, the material of the elastic bag 80 is an insulating material, which is conducive to avoiding lightning strikes on the elastic bag 80.

[0102] In some implementable manners, the material of the elastic bag 80 includes but is not limited to rubber and polyurethane (TPU), so that the elastic bag 80 itself has good elastic deformation capability, which is conducive to improving the response rate of the shape change of the elastic bag 80, and at the same time, the elastic bag 80 has good fatigue resistance and manufacturing process properties.

[0103] In some implementable manners, along the length direction Z of the blade 70, the elastic bag 80 can be arranged at the middle section of the blade 70. On the one hand, the elastic bag 80 is conducive to reducing the lift of the blade 70 by controlling the shape of the elastic bag 80, so that the load of the blade 70 is controlled. On the other hand, when the elastic bag 80 is in the contracted state, it is not easy to affect the aerodynamic performance of the middle section of the blade 70 and the tip 76 section.

[0104] In some feasible embodiments, at least a portion of the inner wall of the elastic bladder 80 is a non-smooth surface. This reduces the likelihood of the inner wall of the elastic bladder 80 adhering to or blocking the fluid outlet during fluid discharge, facilitating rapid emptying of the fluid from the elastic bladder 80 and increasing its deformation rate. The non-smooth surface on the inner wall of the elastic bladder 80 can be formed by at least one of grooves, regular patterns, irregular patterns, and surface protrusions.

[0105] When the elastic bladder 80 is in a contracted state, there are areas of contact between the inner walls of the elastic bladder 80. When the elastic bladder 80 is in a contracted state, the contact area between the inner walls of the elastic bladder 80 is relatively small on the non-smooth surface area. This makes it less likely for large areas of adhesion to form between the inner walls of the elastic bladder 80, which helps reduce the possibility of significant resistance during the expansion process due to large areas of adhesion between the inner walls of the elastic bladder 80.

[0106] In some examples, the inner wall of at least one of the first capsule 81 and the second capsule 82 is a non-smooth surface.

[0107] See also some of the possible implementation methods. Figures 6 to 8 As shown, the elastic capsule 80 also includes an elastic partition wall 83. The elastic partition wall 83 is located in the inner cavity 801. The first capsule piece 81 and the second capsule piece 82 are respectively connected to the elastic partition wall 83. When the second capsule piece 82 moves away from or closer to the first capsule piece 81, the elastic partition wall 83 stretches or contracts.

[0108] The inner cavity 801 is divided into two or more sub-chambers 802 by an elastic partition wall 83. The elastic partition wall 83 includes a fluid channel 831. The sub-chambers 802 on both sides of the elastic partition wall 83 are connected by the fluid channel 831. The fluid medium filled into the elastic bladder 80 can flow between the different sub-chambers 802 through the fluid channel 831.

[0109] During the transition from a contracted to an expanded state, the second capsule 82 moves away from the first capsule 81. The second capsule 82 applies tensile stress to the elastic partition wall 83, thus stretching the elastic partition wall 83. During the deformation of the second capsule 82, the elastic partition wall 83 can constrain the second capsule 82, thereby controlling the overall shape of the second capsule 82 after deformation to meet the required profile, reducing the possibility that the overall shape of the elastic capsule 80 may not achieve the expected profile due to the free deformation of the second capsule 82.

[0110] During the switching process of the elastic capsule 80 from the expanded state to the contracted state, the second capsule sheet 82 is close to the first capsule sheet 81, and the second capsule sheet 82 releases the elastic partition wall 83. Under the action of the elastic restoring force, the elastic partition wall 83 exerts a tensile stress on the second capsule sheet 82. Under the combined action of the elastic restoring force of the second capsule sheet 82 and the elastic restoring force of the elastic partition wall 83, the second capsule sheet 82 can be switched from the expanded state to the contracted state relatively quickly, which is beneficial to improve the deformation rate of the elastic capsule 80 and the response rate of the elastic capsule 80, and is beneficial to the elastic capsule 80 to complete the shape adjustment in a relatively short time, so that the wind power blade 60 adjusts the aerodynamic performance in a relatively short time.

[0111] When the elastic capsule 80 is in the contracted state, the elastic partition wall 83 can play a tensioning and restraining role on the second capsule sheet 82, so that the second capsule sheet 82 and the first capsule sheet 81 remain in the adhering state, and the possibility of the second capsule sheet 82 and the first capsule sheet 81 accidentally separating from the adhering state and causing the aerodynamic shape of the wind power blade 60 to be adversely affected is reduced.

[0112] In some examples, the elastic partition wall 83 can be a sheet structure. The thickness of the elastic partition wall 83 can be in the range of 1 millimeter to 2 millimeters. For example, the thickness of the elastic partition wall 83 can be 1 millimeter, 1.5 millimeters, or 2 millimeters.

[0113] In some examples, the number of elastic partition walls 83 is one. One elastic partition wall 83 divides the inner cavity 801 into two sub-chambers 802.

[0114] In some examples, the number of elastic partition walls 83 is more than two. More than two elastic partition walls 83 divide the inner cavity 801 into more than three sub-chambers 802.

[0115] In some examples, the fluid passage 831 on the elastic partition wall 83 can be a hole structure.

[0116] In some examples, the material of the elastic partition wall 83 includes but is not limited to rubber, polyurethane. The material of the first capsule sheet 81 can include but is not limited to rubber, polyurethane. The material of the second capsule sheet 82 can include but is not limited to rubber, polyurethane.

[0117] In some examples, the material of the elastic partition wall 83 can be the same as or different from the material of the first capsule sheet 81. The material of the first capsule sheet 81 can be the same as or different from the material of the second capsule sheet 82.

[0118] In some realizable ways, see Figure 7As shown, the number of elastic partition walls 83 is two or more. The two or more elastic partition walls 83 are arranged along the length direction Z or the width direction Y of the blade 70. The two or more elastic partition walls 83 divide the inner cavity 801 into three or more sub-chambers 802. Each elastic partition wall 83 has one sub-chamber 802 on each side.

[0119] The two or more elastic partition walls 83 are arranged along the length direction Z of the blade 70. Each sub-chamber 802 is arranged along the length direction Z of the blade 70. Alternatively, the two or more elastic partition walls 83 are arranged along the width direction Y of the blade 70. Each sub-chamber 802 is arranged along the width direction Y of the blade 70.

[0120] The two or more elastic partition walls 83 are distributed at different positions in the inner cavity 801. During the deformation of the second capsule 82, the two or more elastic partition walls 83 can constrain the second capsule 82 at different positions, which is conducive to further accurately controlling the shape of the deformed second capsule 82 to meet the external shape requirements.

[0121] In some implementable manners, referring to Figure 7 and Figure 8 As shown, the elastic partition wall 83 is connected with the first capsule 81 to form a first connection area 803. The elastic partition wall 83 is connected with the second capsule 82 to form a second connection area 804. In the direction perpendicular to the pressure surface 71, the orthographic projection of the first connection area 803 does not overlap with the orthographic projection of the second connection area 804.

[0122] When the elastic capsule 80 is in the contracted state, the first connection area 803 and the second connection area 804 are arranged staggered with each other, and the positions of the first connection area 803 and the second connection area 804 do not correspond to each other, so that the first capsule 81, the elastic partition wall 83 and the second capsule 82 are in a mutually stacked state, which is conducive to reducing the possibility that the second capsule 82 protrudes too high in the area corresponding to the elastic partition wall 83 due to the local heightening of the second capsule 82 by the elastic partition wall 83, and reducing the possibility that the aerodynamic shape of the wind turbine blade 60 is adversely affected due to the local protrusion of the second capsule 82.

[0123] When the elastic capsule 80 is in the expanded state, the elastic partition wall 83 is arranged inclined relative to the first capsule 81 and the second capsule 82, so that the first connection area 803 and the second connection area 804 are arranged staggered with each other, and the positions of the first connection area 803 and the second connection area 804 do not correspond to each other.

[0124] In some implementable manners, referring to Figure 2 and Figure 9As shown, the blade 70 includes a blade root 75 and a blade tip 76 arranged opposite along the length direction Z. Two or more sub-chambers 802 are arranged along the width direction Y of the blade 70. The elastic partition wall 83 extends along the length direction Z of the blade 70, and the fluid passage 831 is arranged at the end of the elastic partition wall 83 close to the blade tip 76.

[0125] The aerodynamic shape of the wind power blade 60 is adjusted by the elastic capsule 80 in the rotating state of the wind power blade 60. The fluid passage 831 is arranged at the end of the elastic partition wall 83 close to the blade tip 76, so that in the rotating state of the wind power blade 60, the fluid medium in the inner cavity 801 of the elastic capsule 80 can relatively quickly fill or discharge each sub-chamber 802 through the fluid passage 831 under the action of centrifugal force, which is beneficial to improve the response rate and deformation rate of the shape change of the elastic capsule 80.

[0126] In some implementable manners, the first capsule sheet 81, the second capsule sheet 82, and the elastic partition wall 83 are integrally formed.

[0127] The first capsule sheet 81, the second capsule sheet 82, and the elastic partition wall 83 form an integral structure. The connection strength between the first capsule sheet 81, the second capsule sheet 82, and the elastic partition wall 83 is relatively large, so that the structural strength of the first connection region 803 and the second connection region 804 of the first capsule sheet 81, the second capsule sheet 82, and the elastic partition wall 83 is relatively large, the impact resistance and fatigue resistance of the first connection region 803 and the second connection region 804 are improved, the possibility that at least one of the first connection region 803 and the second connection region 804 is easily cracked or fractured due to the alternating stress borne by the second capsule sheet 82 reciprocatingly moving is reduced, and the service life of the elastic capsule 80 is prolonged.

[0128] In some examples, the first capsule sheet 81, the second capsule sheet 82, and the elastic partition wall 83 are made of the same material.

[0129] In some implementable manners, referring to Figure 9 and Figure 10 As shown, the elastic capsule 80 includes a sealing edge 84 surrounding the inner cavity 801. The first capsule sheet 81 and the second capsule sheet 82 are respectively connected with the sealing edge 84. The sealing edge 84 is connected with the pressure surface 71. In the direction away from the inner cavity 801, the thickness of the sealing edge 84 gradually decreases.

[0130] The inner cavity 801 of the elastic capsule 80 does not extend into the sealing edge 84. When the second capsule sheet 82 of the elastic capsule 80 expands or shrinks, the position of the sealing edge 84 on the pressure surface 71 does not change. The sealing edge 84 of the elastic capsule 80 does not expand or shrink.

[0131] The elastic bag 80 is connected to the pressure surface 71 through the first bag piece 81 and the edge 84, which increases the connection area between the elastic bag 80 and the pressure surface 71, and is beneficial to improve the connection strength and stability between the elastic bag 80 and the pressure surface 71, and reduce the possibility of the elastic bag 80 separating from the blade 70 due to the reciprocating expansion or contraction of the elastic bag 80.

[0132] The edge 84 is arranged around the first bag piece 81. The edge 84 can play a limiting and restraining role on the first bag piece 81. When the second bag piece 82 expands, the second bag piece 82 will exert tensile stress on the first bag piece 81. Since the first bag piece 81 is limited by the edge 84, the force borne on the first bag piece 81 can be dispersed to the edge 84 and the blade 70, which reduces the possibility of the edge of the first bag piece 81 separating from the pressure surface 71 and turning up due to the edge of the first bag piece 81 being pulled by the second bag piece 82.

[0133] In the direction away from the inner cavity 801, the thickness of the edge 84 gradually decreases, so that the edge 84 and the pressure surface 71 can be smoothly transitioned, which is beneficial to reduce the possibility of the profile of the edge 84 adversely affecting the aerodynamic profile of the wind turbine blade 60.

[0134] In some examples, the edge 84 can be a solid structure.

[0135] In some implementable manners, referring to Figure 10 As shown, the elastic bag 80 can include a fluid inlet 805 and a fluid outlet 806 arranged on the first bag piece 81. The fluid inlet 805 and the fluid outlet 806 are in communication with the inner cavity 801.

[0136] In some examples, the inner cavity 801 can include N sub-chambers 802, where N is an odd number greater than 1. The fluid inlet 805 and the fluid outlet 806 can be arranged on the region of the first bag piece 81 corresponding to the middle sub-chamber 802. For example, referring to Figure 10 As shown, the inner cavity 801 can include three sub-chambers 802. The fluid inlet 805 and the fluid outlet 806 are arranged on the region of the first bag piece 81 corresponding to the middle second sub-chamber 802.

[0137] When it is necessary to control the expansion of the elastic bag 80, the fluid medium input through the fluid inlet 805 can flow to the two side sub-chambers 802, which is beneficial to improve the expansion rate and deformation consistency of the elastic bag 80.

[0138] When it is necessary to control the contraction of the elastic bag 80, the fluid medium in the two side sub-chambers 802 can be discharged through the fluid outlet 806, which is beneficial to improve the consistency of the discharge rate of the fluid medium in the two side sub-chambers 802, thereby being beneficial to improve the contraction rate and deformation consistency of the elastic bag 80.

[0139] In some implementable manners, referring to Figs. 1-2, the wind power blade 60 further comprises an adhesive 90. The first capsule 81 and the edge 84 are adhered to the pressure surface 71 through the adhesive 90. Figure 11 and Figure 12 As shown, the wind power blade 60 further comprises an adhesive 90. The first capsule 81 and the edge 84 are adhered to the pressure surface 71 through the adhesive 90.

[0140] The first capsule 81 and the edge 84 are respectively adhered to the pressure surface 71, which on one hand, is conducive to reducing the difficulty of connecting the elastic capsule 80 and the blade 70, and on the other hand, does not need to additionally set a connecting structure on the elastic capsule 80 and the blade 70, which is conducive to reducing the processing difficulty of the elastic capsule 80 and the blade 70.

[0141] In some examples, the first capsule 81 and the edge 84 are adhered to the first region 711 through the adhesive 90. Alternatively, the first capsule 81 and the edge 84 are adhered to the second region 712 through the adhesive 90. Alternatively, a part of the first capsule 81 and the edge 84 is adhered to the first region 711 through the adhesive 90, and the other part is adhered to the second region 712 through the adhesive 90.

[0142] In some examples, the adhesive 90 can include but is not limited to an adhesive glue. For example, the adhesive glue includes an acrylate glue.

[0143] In some examples, the thickness of the adhesive 90 can be 0.5 mm to 1 mm. For example, the thickness of the adhesive 90 can be 0.5 mm, 0.8 mm, or 1 mm.

[0144] In some examples, the edge 84 can be a rectangular structure with four edges.

[0145] In some examples, the width of the edge 84 can be 30 mm to 50 mm. For example, the width of the edge 84 can be 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm.

[0146] The width of the edge 84 is 30 mm to 50 mm, which on one hand, is conducive to ensuring that the edge 84 itself has good structural strength, on the other hand, is conducive to ensuring that the edge 84 and the pressure surface 71 have a larger connecting area, improving the connecting strength between the edge 84 and the pressure surface 71, and on the other hand, is conducive to realizing a smooth transition between the edge 84 and the pressure surface 71.

[0147] In some examples, the surface of the edge 84 facing away from the pressure surface 71 is beveled. The slope of the bevel ranges from 1:50 to 1:10, which helps to ensure a smooth transition between the edge 84 and the pressure surface 71 and reduces the possibility that the profile of the edge 84 adversely affects the aerodynamic profile of the wind turbine blade 60. By way of example, the slope of the bevel can be 1:50, 1:40, 1:30, 1:20, or 1:10.

[0148] In some examples, the first capsule 81, the second capsule 82, and the edge 84 are integrally formed.

[0149] The first capsule 81, the second capsule 82, and the edge 84 form an integral structure. The connection strength between the first capsule 81, the second capsule 82, and the edge 84 is relatively high, so that the structural strength of the first capsule 81, the second capsule 82, and the edge 84 at the connection region is relatively high, which improves the impact resistance and fatigue resistance of the connection region and reduces the possibility that the connection region is prone to cracking or breaking due to the alternating stress caused by the reciprocating movement of the second capsule 82, which helps to prolong the service life of the elastic capsule 80.

[0150] In some examples, the first capsule 81, the second capsule 82, and the edge 84 are made of the same material.

[0151] In some examples, the adhesive 90 can cover the entire surface of the first capsule 81 and the edge 84 facing the pressure surface 71.

[0152] In some examples, as shown in Figure 13 The adhesive 90 can include an annular adhesive portion 91 and a strip-shaped adhesive portion 92. The strip-shaped adhesive portion 92 is located within the annular adhesive portion 91. The first capsule 81 is adhered to the strip-shaped adhesive portion 92. The edge 84 is adhered to the annular adhesive portion 91.

[0153] The elastic capsule 80 is adhered and fixed to the pressure surface 71 by the annular adhesive portion 91 and the strip-shaped adhesive portion 92, which helps to reduce the amount of adhesive used and reduce costs while ensuring connection strength.

[0154] By way of example, the two ends of the strip-shaped adhesive portion 92 are respectively connected to the annular adhesive portion 91.

[0155] By way of example, the number of strip-shaped adhesive portions 92 is two or more. The two or more strip-shaped adhesive portions 92 are arranged at intervals.

[0156] In some possible implementations, as shown in Figure 12 and Figure 14As shown, the wind power blade 60 further comprises a protective piece 100. The protective piece 100 is arranged around the sealing edge 84. At least one of the sealing edge 84, the adhesive piece 90 and the pressure surface 71 is connected with the protective piece 100. The protective piece 100 covers the outer side of the sealing edge 84 and the outer side of the adhesive piece 90, so that the outer side of the sealing edge 84 and the outer side of the adhesive piece 90 are not exposed.

[0157] The protective piece 100 can protect the sealing edge 84 and the adhesive piece 90 at the periphery of the sealing edge 84 and the adhesive piece 90, which is conducive to blocking water, sunlight and other substances, preventing the adhesive piece 90 from aging, deforming or failing, and reducing the possibility of connection failure between the sealing edge 84 and the adhesive piece 90 and connection failure between the adhesive piece 90 and the pressure surface 71.

[0158] In some examples, the sealing edge 84, the adhesive piece 90 and the pressure surface 71 are all connected with the protective piece 100, which is conducive to further improving the sealing effect and protection effect of the protective piece 100.

[0159] In some examples, the material of the protective piece 100 includes but is not limited to silica gel.

[0160] In some examples, the sealing edge 84 is a rectangular structure. The protective piece 100 is a rectangular structure.

[0161] In some examples, the thickness of the protective piece 100 gradually decreases in the direction away from the inner cavity 801, so that the protective piece 100 and the pressure surface 71 can be smoothly transitioned, which is conducive to reducing the possibility that the profile of the protective piece 100 adversely affects the aerodynamic profile of the wind power blade 60.

[0162] In some realizable manners, along the length direction Z of the blade 70, the pressure surface 71 is provided with two or more elastic capsules 80.

[0163] Through the two or more elastic capsules 80, the aerodynamic profile of the wind power blade 60 can be more flexibly adjusted to adjust the aerodynamic performance of the wind power blade 60, which is conducive to improving the ability to adjust and optimize the aerodynamic performance of the wind power blade 60.

[0164] In some examples, the two or more elastic capsules 80 are arranged at intervals along the length direction Z of the blade 70. Any two adjacent elastic capsules 80 have a spacing, on the one hand, there is no positional interference between any two adjacent elastic capsules 80, so that each elastic capsule 80 is easy to install and fix on the pressure surface 71, on the other hand, it is conducive to preventing the problem that any two adjacent second capsules 82 are easily pressed against each other when the second capsules 82 expand, reducing the possibility that the profile of each elastic capsule 80 does not conform to the expected profile due to the mutual pressing of the second capsules 82.

[0165] Exemplarily, the interval between any two adjacent elastic capsules 80 along the length direction Z of the blade 70 is 5-10 mm. For example, the interval between any two adjacent elastic capsules 80 is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0166] In some examples, each elastic capsule 80 is configured to be controlled to expand or contract individually.

[0167] In some implementable manners, referring to Figure 15 As shown, the exposed surface of the elastic capsule 80 is provided with a protective coating 85. The protective coating 85 can play a protective role on the elastic capsule 80, which is conducive to blocking water or sunlight and other substances, preventing the elastic capsule 80 from aging and failure, and prolonging the service life of the elastic capsule 80.

[0168] In some examples, the exposed surface of each of the second capsule sheet 82 and the edge 84 is provided with a protective coating 85. The surface of the first capsule sheet 81 facing the pressure surface 71 can not be provided with a protective coating 85.

[0169] In some examples, the material of the protective coating 85 can include but is not limited to polyurethane.

[0170] In some examples, the thickness of the protective coating 85 can be 0.2-0.4 mm. For example, the thickness of the protective coating 85 can be 0.2 mm, 0.3 mm, or 0.4 mm.

[0171] In some implementable manners, the material of the elastic capsule 80 includes an ultraviolet absorber. The ultraviolet absorber can efficiently absorb ultraviolet rays in sunlight, reduce the damage of ultraviolet rays to the elastic capsule 80, and be conducive to prolonging the service life of the elastic capsule 80.

[0172] In some examples, the ultraviolet absorber can include but is not limited to UV-326.

[0173] In some implementable manners, the material of the elastic capsule 80 includes a fiber material, which is conducive to increasing the structural strength of the elastic capsule 80, improving the fatigue resistance of the elastic capsule 80, and prolonging the service life of the elastic capsule 80.

[0174] In some examples, the fiber material can include but is not limited to glass fiber and carbon fiber.

[0175] In some implementable manners, referring to Figure 16 As shown, the blade 70 includes a hollow chamber 701. The wind turbine blade 60 further includes a fluid distribution device 110. At least part of the fluid distribution device 110 is located in the hollow chamber 701. The fluid distribution device 110 is connected with the elastic capsule 80. The fluid distribution device 110 communicates with the inner cavity 801.

[0176] The fluid distribution device 110 is configured to control the inflow of fluid medium into the inner cavity 801 of the elastic bladder 80 or control the outflow of fluid medium from the inner cavity 801 of the elastic bladder 80, so as to control the shape of the elastic bladder 80.

[0177] When the wind speed and the wind direction meet the normal working requirements of the wind turbine generator set 10, the fluid distribution device 110 can control the elastic bladder 80 to be in the contracted state. When the wind speed and the wind direction do not meet the normal working requirements of the wind turbine generator set 10, the fluid distribution device 110 can control the elastic bladder 80 to be in the expanded state, so as to realize the load reduction of the wind power blade 60 and ensure the structural safety of the wind power blade 60.

[0178] The fluid distribution device 110 can multiplex the hollow chamber 701 of the blade 70, so as to improve the space utilization rate of the hollow chamber 701 and reduce the arrangement difficulty of the fluid distribution device 110.

[0179] In some examples, the fluid distribution device 110 can include a pump for conveying fluid medium.

[0180] In some examples, the fluid medium can be air. When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the contracted state to the expanded state, the fluid distribution device 110 can draw air from the atmospheric environment and fill the air into the inner cavity 801 of the elastic bladder 80, so as to expand the elastic bladder 80. When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the expanded state to the contracted state, the air in the elastic bladder 80 can be discharged to the atmospheric environment through the fluid distribution device 110, so as to contract the elastic bladder 80.

[0181] In some examples, the number of the elastic bladders 80 is more than two. The number of the fluid distribution devices 110 can be more than two. The number of the elastic bladders 80 is one-to-one corresponding to the number of the fluid distribution devices 110. One fluid distribution device 110 can control the expansion or contraction of one elastic bladder 80.

[0182] In some examples, the number of the elastic bladders 80 is more than two. The number of the fluid distribution devices 110 can be one. One fluid distribution device 110 can control the expansion or contraction of multiple elastic bladders 80 at the same time.

[0183] In some implementable manners, referring to Figure 17As shown, the elastic capsule 80 includes a fluid inlet 805 and a fluid outlet 806 arranged on the first capsule sheet 81. The fluid inlet 805 and the fluid outlet 806 are in communication with the inner cavity 801. The blade 70 includes a first through hole 702 and a second through hole 703 penetrating the pressure surface 71. The wind power blade 60 further includes a fluid distribution device 110. The fluid distribution device 110 includes an input pipeline 111, an output pipeline 112, a first valve 113 and a second valve 114. The input pipeline 111 and the output pipeline 112 pass through the first through hole 702 and the second through hole 703 respectively and are connected with the fluid inlet 805 and the fluid outlet 806. The first valve 113 and the second valve 114 are configured to control the input pipeline 111 and the output pipeline 112 to be conducted or cut off.

[0184] The first through hole 702 and the second through hole 703 are arranged on the blade 70 in such a manner that the elastic capsule 80 and the fluid distribution device 110 are connected through the input pipeline 111 and the output pipeline 112, which is conducive to reducing the connection difficulty of the elastic capsule 80 and the fluid distribution device 110.

[0185] After the first capsule sheet 81 is connected with the pressure surface 71, the first capsule sheet 81 can cover the first through hole 702 and the second through hole 703, so that the first capsule sheet 81 can play a protective role on the first through hole 702 and the second through hole 703, reducing the possibility of foreign matter or water entering the inside of the blade 70 through the first through hole 702 and the second through hole 703.

[0186] When the fluid distribution device 110 needs to control the elastic capsule 80 to switch from the contracted state to the expanded state, the second valve 114 is closed to cut off the output pipeline 112, and the first valve 113 is opened to conduct the input pipeline 111, so that the fluid medium is filled into the inner cavity 801 of the elastic capsule 80 through the input pipeline 111 and the fluid inlet 805, so that the elastic capsule 80 is expanded. When the elastic capsule 80 is expanded to a predetermined shape, the first valve 113 is closed to cut off the input pipeline 111.

[0187] When the fluid distribution device 110 needs to control the elastic capsule 80 to switch from the expanded state to the contracted state, the second valve 114 is opened to conduct the output pipeline 112, and the fluid medium in the inner cavity 801 of the elastic capsule 80 is discharged through the output pipeline 112. When the elastic capsule 80 is contracted to a predetermined shape, the second valve 114 is closed to cut off the output pipeline 112.

[0188] In some examples, the first valve 113 can include but is not limited to a solenoid valve, a hydraulic valve. The second valve 114 can include but is not limited to a solenoid valve, a hydraulic valve.

[0189] In some examples, referring to Figure 2 and Figure 18As shown, the blade 70 includes a blade root 75 and a blade tip 76 oppositely arranged along a length direction Z. The fluid inlet 805 is arranged close to the blade root 75 along the length direction Z of the blade 70. The fluid outlet 806 is arranged close to the blade tip 76.

[0190] The aerodynamic shape of the wind turbine blade 60 is adjusted by the elastic capsule 80 in the rotating state of the wind turbine blade 60. In the rotating state of the wind turbine blade 60, the fluid medium in the inner cavity 801 of the elastic capsule 80 can be relatively quickly filled into the inner cavity 801 under the action of centrifugal force, which is conducive to improving the response rate and deformation rate of the shape change of the elastic capsule 80 in the expansion process.

[0191] In the rotating state of the wind turbine blade 60, the fluid medium in the inner cavity 801 of the elastic capsule 80 can be relatively quickly discharged from the fluid outlet 806 under the action of centrifugal force, which is conducive to improving the response rate and deformation rate of the shape change of the elastic capsule 80 in the contraction process.

[0192] In some examples, the number of fluid inlets 805 can be one or more than two. The number of fluid outlets 806 can be one or more than two.

[0193] In some realizable modes, referring to Figure 19 As shown, the elastic capsule 80 includes a fluid inlet and outlet 807 arranged on the first capsule sheet 81. The fluid inlet and outlet 807 is in communication with the inner cavity 801. The blade 70 includes a through hole 704 penetrating the pressure surface 71. The wind turbine blade 60 further includes a fluid distribution device 110. The fluid distribution device 110 includes a pipeline 115 and a valve 116. The pipeline 115 penetrates the through hole 704 and is connected with the fluid inlet and outlet 807. The valve 116 is configured to control the pipeline 115 to be turned on or cut off.

[0194] The term "fluid inlet and outlet 807" refers to a single opening of the elastic capsule 80. The single opening is used as an inlet and an outlet, and is therefore defined as the fluid inlet and outlet 807. The term does not refer to a separate inlet and outlet. The fluid medium can enter or exit the inside of the elastic capsule 80 through the fluid inlet and outlet 807.

[0195] The elastic capsule 80 realizes the filling or discharge of the fluid medium through the fluid inlet and outlet 807, which is conducive to reducing the number of openings on the elastic capsule 80, and at the same time, reducing the number of through holes 704 arranged correspondingly on the blade 70, and reducing the possibility of adversely affecting the structural strength of the blade 70 due to the opening of more through holes 704 on the blade 70.

[0196] When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the contracted state to the expanded state, the valve 116 is opened, so that the pipeline 115 is connected, and the fluid medium in the inner cavity 801 of the elastic bladder 80 is discharged through the pipeline 115. When the elastic bladder 80 is contracted to a predetermined shape, the valve 116 is closed, so that the pipeline 115 is cut off.

[0197] When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the contracted state to the expanded state, the valve 116 is opened, so that the pipeline 115 is connected, and the fluid medium in the inner cavity 801 of the elastic bladder 80 is discharged through the pipeline 115. When the elastic bladder 80 is contracted to a predetermined shape, the valve 116 is closed, so that the pipeline 115 is cut off.

[0198] In some examples, the valve 116 can include but is not limited to a solenoid valve, a hydraulic valve.

[0199] The embodiment of the present application provides a manufacturing method of a wind power blade 60, which comprises the following steps.

[0200] Providing a blade 70, the blade 70 comprising a pressure surface 71 and a suction surface 72 arranged opposite to each other along a thickness direction X, a leading edge 73 and a trailing edge 74 arranged opposite to each other along a width direction Y, the pressure surface 71 comprising a first region 711 between the maximum thickness of the blade 70 and the leading edge 73 and a second region 712 between the maximum thickness of the blade 70 and the trailing edge 74;

[0201] Providing an elastic bladder 80, the elastic bladder 80 comprising an inner cavity 801, a first bladder piece 81 and a second bladder piece 82, the inner cavity 801 being arranged between the first bladder piece 81 and the second bladder piece 82, the first bladder piece 81 being connected to at least one of the first region 711 and the second region 712, and the second bladder piece 82 being located on a side of the first bladder piece 81 away from the pressure surface 71.

[0202] The manufacturing method of the wind power blade 60 of the embodiment of the present application can be used to manufacture the wind power blade 60 of the above-mentioned embodiment.

[0203] In some examples, the manufacturing method of the wind power blade 60 comprises the following steps.

[0204] Providing a strip-shaped adhesive part 92 on the pressure surface 71;

[0205] Providing a ring-shaped adhesive part 91 along the edge of the elastic bladder 80;

[0206] Attaching the elastic bladder 80 to the pressure surface 71, and connecting the elastic bladder 80 to the pressure surface 71 through the strip-shaped adhesive part 92 and the ring-shaped adhesive part 91;

[0207] Applying a pressure stress to the elastic bladder 80;

[0208] After the strip-shaped bonding part 92 and the ring-shaped bonding part 91 are cured, the pressure stress applied to the elastic bag body 80 is stopped.

[0209] The elastic bag body 80 and the pressure surface 71 are connected and fixed by bonding, which is beneficial to reduce the connection operation difficulty between the elastic bag body 80 and the blade 70, and does not need to additionally set a connection structure on the elastic bag body 80 and the blade 70, which is beneficial to reduce the assembly difficulty of the elastic bag body 80 and the blade 70.

[0210] After the elastic bag body 80 and the blade 70 are bonded, the pressure stress is continuously applied to the elastic bag body 80, which is beneficial to reduce the possibility that the elastic bag body 80 rebounds and causes the elastic bag body 80 and the blade 70 to separate.

[0211] Exemplarily, the cross section of the strip-shaped bonding part 92 arranged on the pressure surface 71 is triangular. The elastic bag body 80 can extrude the strip-shaped bonding part 92, so that the strip-shaped bonding part 92 can gradually expand and increase in width, thereby facilitating uniformity of the width of the strip-shaped bonding part 92.

[0212] Exemplarily, two or more strip-shaped bonding parts 92 are arranged on the pressure surface 71. The two or more strip-shaped bonding parts 92 are arranged at intervals. The interval between any two adjacent strip-shaped bonding parts 92 can be 90 mm to 110 mm. For example, the interval between any two adjacent strip-shaped bonding parts 92 can be 90 mm, 100 mm or 110 mm.

[0213] Exemplarily, during the process of attaching the elastic bag body 80 to the pressure surface 71, one side of the elastic bag body 80 is lightly placed on one end of the strip-shaped bonding part 92, and then a flat plate is used to push the elastic bag body 80, so as to gradually attach the elastic bag body 80 to the pressure surface 71. The way of using the flat plate to push the elastic bag body 80 can extrude the excess adhesive.

[0214] Exemplarily, a sandbag or the like can be placed on the elastic bag body 80 to continuously apply pressure stress to the elastic bag body 80.

[0215] Exemplarily, after the strip-shaped bonding part 92 and the ring-shaped bonding part 91 are cured, the adhesive exposed on the periphery of the elastic bag body 80 is trimmed. After trimming, the adhesive and the pressure surface 71 can form a step or the adhesive can not be fully bonded. A protective piece 100 is arranged on the periphery of the elastic bag body 80 and the adhesive, so as to achieve smooth transition between the protective piece 100 and the pressure surface 71. The protective piece 100 covers the outer side of the elastic bag body 80 and the outer side of the adhesive.

[0216] For example, silica gel is coated on the periphery of the elastic bag body 80 and the adhesive, so as to achieve smooth transition between the silica gel and the pressure surface 71. The cured silica gel forms the protective piece 100.

[0217] Exemplarily, two or more elastic capsules 80 are arranged on the blade 70. The two or more elastic capsules 80 are arranged at intervals so as to facilitate trimming and cleaning of the adhesive extruded by adjacent two elastic capsules 80.

[0218] The manufacturing method of the wind power blade 60 of the embodiment of the present application is used to manufacture the wind power blade 60. The wind power blade 60 manufactured by applying the manufacturing method of the wind power blade 60 comprises the blade 70 and the elastic capsule 80. In the gust of wind with a large wind speed or the extreme wind condition with a large wind speed, the aerodynamic shape of the wind power blade 60 is adjusted by adjusting the size of the volume of the elastic capsule 80, so as to reduce the lift force borne by the blade 70, realize the load reduction of the blade 70, reduce the structural stress and deformation amount of the blade 70, and reduce the possibility of the structural damage of the blade 70 caused by the overload of the blade 70 in the wind condition with high turbulence and high shear, thereby being beneficial to improving the operation safety and environmental adaptability of the wind power blade 60 and prolonging the service life of the wind power blade 60.

[0219] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent components can be substituted for the components thereof, especially, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 wind turbine blade, characterized in that, The wind turbine blade comprises: a blade including a pressure surface and a suction surface arranged oppositely along a thickness direction, a leading edge and a trailing edge arranged oppositely along a width direction, the pressure surface including a first region between the leading edge and a maximum thickness of the blade and a second region between the trailing edge and the maximum thickness of the blade; an elastic capsule including an inner cavity, a first capsule sheet and a second capsule sheet, the inner cavity being arranged between the first capsule sheet and the second capsule sheet, the first capsule sheet being connected to at least one of the first region and the second region, the second capsule sheet being located on a side of the first capsule sheet away from the pressure surface, the elastic capsule being configured to switch between an expanded state and a contracted state, during the switching between the expanded state and the contracted state, the second capsule sheet is away from or close to the first capsule sheet, so that the volume of the inner cavity of the elastic capsule is increased or decreased; the elastic capsule further comprises an elastic partition wall, the elastic partition wall being located in the inner cavity, the first capsule sheet and the second capsule sheet being connected to the elastic partition wall respectively, when the second capsule sheet is away from or close to the first capsule sheet, the elastic partition wall is stretched or contracted, the inner cavity is divided into two or more sub-chambers by the elastic partition wall, the elastic partition wall comprises a fluid passage, the sub-chambers on both sides of the elastic partition wall are communicated through the fluid passage; the elastic partition wall is connected to the first capsule sheet to form a first connection region, and is connected to the second capsule sheet to form a second connection region, in a direction perpendicular to the pressure surface, the orthographic projection of the first connection region does not overlap with the orthographic projection of the second connection region.

2. A wind turbine blade according to claim 1, characterised in that At least part of the inner wall of the elastic capsule is a non-smooth surface.

3. A wind turbine blade according to claim 1, characterised in that The number of the elastic partition walls is two or more, the two or more elastic partition walls are arranged at intervals along the length direction or the width direction of the blade, and one sub-chamber is arranged on each side of each elastic partition wall.

4. A wind turbine blade according to claim 1, characterised in that The blade comprises a blade root and a blade tip arranged oppositely along a length direction, the two or more sub-chambers are arranged at intervals along the width direction of the blade, the elastic partition wall extends along the length direction of the blade, and the fluid passage is arranged at an end of the elastic partition wall close to the blade tip.

5. A wind turbine blade according to claim 1, characterised in that The first capsule sheet, the second capsule sheet and the elastic partition wall are integrally formed.

6. A wind turbine blade according to claim 1, characterised in that The elastic capsule comprises a sealing edge surrounding the inner cavity, the first capsule sheet and the second capsule sheet are connected to the sealing edge respectively, the sealing edge is connected to the pressure surface, and the thickness of the sealing edge gradually decreases in a direction away from the inner cavity.

7. A wind turbine blade according to claim 6, characterised in that The wind turbine blade further comprises an adhesive member, the first capsule sheet and the sealing edge are adhered to the pressure surface through the adhesive member.

8. A wind turbine blade according to claim 7, characterised in that The wind turbine blade further comprises a protective member, the protective member surrounds the sealing edge, at least one of the sealing edge, the adhesive member and the pressure surface is connected to the protective member, and the protective member covers the outer side surface of the sealing edge and the outer side surface of the adhesive member.

9. A wind turbine blade according to claim 7, characterised in that The adhesive member comprises an annular adhesive part and a strip-shaped adhesive part, the strip-shaped adhesive part is located in the annular adhesive part, The first capsule is bonded to the strip-shaped bonding portion, and the edge is bonded to the ring-shaped bonding portion.

10. A wind turbine blade according to claim 6, characterised in that The width of the edge is 30-50 mm.

11. A wind turbine blade according to claim 6, characterised in that The surface of the edge opposite to the pressure surface is a slope, and the slope has a slope ratio of 1:50-1:

10.

12. A wind turbine blade according to claim 6, characterised in that The first capsule, the second capsule and the edge are integrally formed.

13. A wind turbine blade according to claim 1 characterised in that, Along the length direction of the blade, two or more elastic capsules are arranged on the pressure surface.

14. A wind turbine blade according to claim 13, characterised in that Two or more elastic capsules are arranged at intervals along the length direction of the blade.

15. A wind turbine blade according to claim 14, characterised in that Along the length direction of the blade, the interval between any two adjacent elastic capsules is 5-10 mm.

16. A wind turbine blade according to claim 1 characterised in that The exposed surface of the elastic capsule is provided with a protective coating.

17. A wind turbine blade according to claim 1 characterised in that The material of the elastic capsule comprises an ultraviolet absorber; and / or The material of the elastic capsule comprises a fiber material.

18. A wind turbine blade according to claim 1 characterised in that The blade comprises a hollow chamber, and the wind turbine blade further comprises a fluid distribution device, at least part of the fluid distribution device being located in the hollow chamber, the fluid distribution device being connected to the elastic capsule, and the fluid distribution device being in communication with the inner cavity.

19. A wind turbine blade according to claim 1 characterised in that The elastic capsule comprises a fluid inlet and a fluid outlet arranged on the first capsule, the fluid inlet and the fluid outlet being in communication with the inner cavity, the blade comprising a first through hole and a second through hole penetrating the pressure surface, The wind turbine blade further comprises a fluid distribution device, the fluid distribution device comprising an input pipeline, an output pipeline, a first valve and a second valve, the input pipeline and the output pipeline penetrating the first through hole and the second through hole respectively and being connected to the fluid inlet and the fluid outlet, the first valve and the second valve being configured to control the input pipeline and the output pipeline to be in conduction or cut off.

20. A wind turbine blade according to claim 19, characterised in that The blade comprises a blade root and a blade tip arranged oppositely along the length direction, Along the length direction of the blade, the fluid inlet is arranged close to the blade root, and the fluid outlet is arranged close to the blade tip.

21. A wind turbine blade according to claim 1, characterised in that The elastic capsule comprises a fluid inlet and a fluid outlet arranged on the first capsule, the fluid inlet and the fluid outlet being in communication with the inner cavity, the blade comprising a through hole penetrating the pressure surface, The wind turbine blade further comprises a fluid distribution device, the fluid distribution device comprising a pipeline and a valve, the pipeline penetrating the through hole and being connected to the fluid inlet and the fluid outlet, and the valve being configured to control the pipeline to be in conduction or cut off.

22. A wind power unit characterized by The wind turbine blade according to any one of claims 1-21.

23. A method of manufacturing a wind turbine blade, c h a r a c t e r i s e d in that Comprise: A blade is provided, the blade comprising a pressure surface and a suction surface arranged oppositely along the thickness direction, a leading edge and a trailing edge arranged oppositely along the width direction, the pressure surface comprising a first region between the maximum thickness of the blade and the leading edge and a second region between the maximum thickness of the blade and the trailing edge; An elastic capsule is provided, the elastic capsule comprising an inner cavity, a first capsule and a second capsule, the first capsule and the second capsule being arranged oppositely along the thickness direction, the first capsule being connected to at least one of the first region and the second region, and the second capsule being arranged on the side of the first capsule opposite to the pressure surface. The elastic capsule further comprises an elastic partition wall in the inner cavity, the first capsule piece and the second capsule piece are connected with the elastic partition wall respectively, the elastic partition wall stretches or shrinks when the second capsule piece is away from or close to the first capsule piece, The inner cavity is divided into two or more sub-chambers by the elastic partition wall, the elastic partition wall comprises a fluid channel, the sub-chambers on both sides of the elastic partition wall are communicated through the fluid channel; The elastic partition wall is connected with the first capsule piece to form a first connection area, and the elastic partition wall is connected with the second capsule piece to form a second connection area, The orthographic projection of the first connection area and the orthographic projection of the second connection area do not overlap in the direction perpendicular to the pressure surface.

24. The method of manufacturing a wind turbine blade according to claim 23, wherein, A strip-shaped adhesive part is arranged on the pressure surface; A ring-shaped adhesive part is arranged along the edge of the elastic capsule; The elastic capsule is attached to the pressure surface, and the elastic capsule is connected with the pressure surface through the strip-shaped adhesive part and the ring-shaped adhesive part; Pressure stress is applied to the elastic capsule; After the strip-shaped adhesive part and the ring-shaped adhesive part are cured, the pressure stress applied to the elastic capsule is stopped.

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