Wind power blade, wind generating set and wind power blade manufacturing method

Abstract

The invention relates to a wind power blade, a wind generating set and a wind power blade manufacturing method. The wind power blade comprises a blade body and an elastic bag body. Each blade comprises a pressure surface and a suction surface which are oppositely arranged in the thickness direction, and a front edge and a rear edge which are oppositely arranged in the 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. The elastic capsule body comprises an inner cavity, a first capsule piece and a second capsule piece. An inner cavity is formed between the first capsule piece and the second capsule piece. The first capsule sheet is connected to at least one of the first region and the second region. The second capsule piece is located on the side, back to the pressure face, of the first capsule piece. The elastic capsule is configured to switch between an expanded state and a contracted state. And in the switching process of the expansion state and the contraction state, the second capsule piece is far away from or close to the first capsule piece, so that the volume of the inner cavity of the elastic capsule body is increased or decreased.

Description

Technical Field

[0001] This application relates to the field of wind power generation, and particularly to a wind turbine blade, a wind turbine generator set, and a method for manufacturing a wind turbine blade. Background Art

[0002] In recent years, as a large-scale commercialized clean and renewable energy source, wind energy has received extensive attention from various countries. With the rapid development of the wind power industry, wind turbine blades are continuously becoming larger. Wind turbine blades are the core components for wind turbines to capture wind energy, and their 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 wind turbine blades has become the research focus. Summary of the Invention

[0003] This application provides a wind turbine blade, a wind turbine generator set, and a method for manufacturing a wind turbine blade, which are beneficial to improving the operating safety of the wind turbine blade.

[0004] This application provides a wind turbine blade, which includes a blade and an elastic bladder.

[0005] The blade includes a pressure surface and a suction surface that are oppositely arranged in the thickness direction, and a leading edge and a trailing edge that are oppositely arranged in the width direction. The pressure surface includes a first region located between the maximum thickness of the blade and the leading edge and a second region located between the maximum thickness of the blade and the trailing edge. The elastic bladder includes an inner cavity, a first bladder piece, and a second bladder piece. The inner cavity is arranged between the first bladder piece and the second bladder piece. The first bladder piece is connected to at least one of the first region and the second region. The second bladder piece is located on the side of the first bladder piece facing away from the pressure surface. The elastic bladder is configured to switch between an expanded state and a contracted state. During the switching process between the expanded state and the contracted state, the second bladder piece moves away from or close to the first bladder piece, so that the volume of the inner cavity of the elastic bladder increases or decreases.

[0006] The wind turbine blade of this application includes a blade and an elastic bladder. Under gusts with a relatively high wind speed or extreme wind conditions with a relatively high wind speed, by adjusting the volume of the elastic bladder, the aerodynamic shape of the wind turbine blade is adjusted to reduce the lift borne by the blade, achieve blade load reduction, reduce the structural stress and deformation of the blade, and reduce the possibility of blade structural damage caused by blade overload under high-turbulence and high-shear wind conditions, which is beneficial to improving the operating safety and environmental adaptability of the wind turbine blade and extending the service life of the wind turbine blade.

[0007] In some realizable ways, at least part of the inner wall of the elastic bladder is a non-smooth surface.

[0008] At least a part of the inner wall of the elastic bladder is a non-smooth surface, so that during the process of discharging the fluid, the possibility of adhesion or blockage of the fluid outlet by the inner wall of the elastic bladder is reduced, which is beneficial to quickly empty the fluid in the elastic bladder and improve the deformation rate of the elastic bladder.

[0009] In some feasible ways, the elastic bladder further includes an elastic partition wall located in the inner cavity. The first bladder piece and the second bladder piece are respectively connected to the elastic partition wall. When the second bladder piece moves away from or approaches the first bladder piece, the elastic partition wall stretches or contracts. 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 communicated through the fluid passage.

[0010] During the process of the elastic bladder switching from the contracted state to the expanded state, the second bladder piece moves away from the first bladder piece, and the second bladder piece applies a tensile stress to the elastic partition wall to stretch the elastic partition wall. During the deformation of the second bladder piece, the elastic partition wall can play a constraining role on the second bladder piece, so as to control the shape of the second bladder piece after overall deformation to meet the shape requirements by using the elastic partition wall, and reduce the possibility that the overall shape of the elastic bladder is not easy to reach the expected shape due to the free deformation of the second bladder piece. During the process of the elastic bladder switching from the expanded state to the contracted state, the second bladder piece approaches the first bladder piece, and the second bladder piece releases the elastic partition wall. Under the action of the elastic restoring force, the elastic partition wall applies a tensile stress to the second bladder piece. Under the combined action of its own elastic restoring force and the elastic restoring force of the elastic partition wall, the second bladder piece switches from the expanded state to the contracted state relatively quickly, which is beneficial to improving the deformation rate of the elastic bladder and the response rate of the elastic bladder, and is beneficial to the elastic bladder to complete the shape adjustment in a relatively short time, so that the wind turbine blade can adjust the aerodynamic performance in a relatively short time.

[0011] In some feasible ways, 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. A sub-chamber is arranged on each side of each elastic partition wall. The two or more elastic partition walls are distributed at different positions in the inner cavity. During the deformation of the second bladder piece, the two or more elastic partition walls can play a constraining role on the second bladder piece at different positions, which is beneficial to further accurately control the shape of the second bladder piece after overall deformation to meet the shape requirements through the two or more elastic partition walls.

[0012] In some feasible ways, the elastic partition wall is connected to the first bladder piece to form a first connection area, and the elastic partition wall is connected to the second bladder piece to form a second connection area. Along the direction perpendicular to the pressure surface, the orthographic projection of the first connection area does not overlap with the orthographic projection of the second connection area.

[0013] When the elastic bladder is in a contracted state, the first connection area and the second connection area are staggered and their positions do not correspond to each other, so that the first bladder sheet, the elastic partition wall and the second bladder sheet are stacked on each other, which helps to reduce the possibility of the second bladder sheet bulging too high in the area corresponding to the elastic partition wall due to the elastic partition wall partially raising the second bladder sheet, and reduces the possibility of the aerodynamic shape of the wind turbine blade being adversely affected due to the excessive protrusion of the second bladder sheet.

[0014] In some achievable embodiments, the blade includes a blade root and a blade tip that are arranged opposite to each other along the length direction, two or more sub-chambers are arranged at intervals along the width direction of the blade, an elastic partition wall extends along the length direction of the blade, and a fluid channel is arranged at the end of the elastic partition wall near the blade tip. When the wind turbine blade is in a rotating state, the aerodynamic shape of the wind turbine blade is adjusted by the elastic sac. The fluid channel is arranged at the end of the elastic partition wall near the blade tip, so when the wind turbine blade is in a rotating state, the fluid medium in the inner cavity of the elastic sac is relatively quickly filled into each sub-chamber or discharged from 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 sac.

[0015] In some achievable embodiments, the first capsule, the second capsule and the elastic partition wall are an integrally formed structure. The first capsule, the second capsule and the elastic partition wall form an integral structure. The connection strength between the first capsule, the second capsule and the elastic partition wall is relatively large, so that the structural strength of the first capsule, the second capsule and the elastic partition wall in the first connection area and the second connection area is relatively large, the impact resistance and fatigue resistance of the first connection area and the second connection area are improved, and the possibility of cracks or fractures caused by at least one of the first connection area and the second connection area bearing alternating stress due to the reciprocating movement of the second capsule is reduced, which is conducive to extending the service life of the elastic capsule.

[0016] In some achievable embodiments, the elastic bladder includes an edge seal surrounding the inner cavity, the first bladder sheet and the second bladder sheet are respectively connected to the edge seal, the edge seal is connected to the pressure surface, and the thickness of the edge seal gradually decreases in the direction away from the inner cavity. The elastic bladder is connected to the pressure surface through the first bladder sheet and the edge seal, which increases the connection area between the elastic bladder and the pressure surface, helps to improve the connection strength and connection stability between the elastic bladder and the pressure surface, and reduces the possibility of the elastic bladder being separated from the blade due to the reciprocating expansion or contraction of the elastic bladder. In the direction away from the inner cavity, the thickness of the edge seal gradually decreases, so that the edge seal and the pressure surface can have a smooth transition, which helps to reduce the possibility that the shape of the edge seal has an adverse effect on the aerodynamic shape of the wind turbine blade.

[0017] In some implementable ways, the wind turbine blade further includes an adhesive member. The first bladder and the edge seal are adhesively bonded to the pressure surface through the adhesive member. The first bladder and the edge seal are each connected and fixed to the pressure surface by adhesive bonding. On the one hand, it is beneficial to reduce the difficulty of the connection operation between the elastic bladder and the blade. On the other hand, there is no need to additionally provide connection structures on the elastic bladder and the blade, which is beneficial to reducing the processing difficulty of the elastic bladder and the blade.

[0018] In some implementable ways, the wind turbine blade further includes a protective member. The protective member is disposed around the edge seal, and at least one of the edge seal, the adhesive member, and the pressure surface is connected to the protective member. The protective member covers the outer side surface of the edge seal and the outer side surface of the adhesive member.

[0019] The protective member can form a protection for the edge seal and the adhesive member around the periphery of the edge seal and the adhesive member, which is beneficial to blocking substances such as water or sunlight, preventing the adhesive member from aging, deforming or failing, and is also beneficial to reducing the possibility of connection failure between the edge seal and the adhesive member and connection failure between the adhesive member and the pressure surface.

[0020] In some implementable ways, the adhesive member includes an annular adhesive portion and a strip-shaped adhesive portion. The strip-shaped adhesive portion is located inside the annular adhesive portion. The first bladder is adhesively bonded to the strip-shaped adhesive portion, and the edge seal is adhesively bonded to the annular adhesive portion. The elastic bladder is adhesively fixed to the pressure surface through the annular adhesive portion and the strip-shaped adhesive portion. The way that the adhesive member includes an annular adhesive portion and a strip-shaped adhesive portion is beneficial to reducing the usage amount of the adhesive and lowering the cost while ensuring the connection strength.

[0021] In some implementable ways, the width of the edge seal ranges from 30 millimeters to 50 millimeters.

[0022] The way that the width of the edge seal ranges from 30 millimeters to 50 millimeters is beneficial, on the one hand, to ensuring that the edge seal itself has good structural strength. On the other hand, it is beneficial to ensuring that there is a large connection area between the edge seal and the pressure surface, improving the connection strength between the edge seal and the pressure surface. On the third hand, it is beneficial to achieving a smooth transition between the edge seal and the pressure surface.

[0023] In some implementable ways, the surface of the edge seal facing away from the pressure surface is an inclined surface, and the slope of the inclined surface ranges from 1:50 to 1:10, which is beneficial to ensuring a smooth transition between the edge seal and the pressure surface and reducing the possibility that the shape of the edge seal has an adverse effect on the aerodynamic shape of the wind turbine blade.

[0024] In some implementable ways, the first bladder, the second bladder, and the edge seal are an integrally formed structure.

[0025] The first bladder piece, the second bladder piece and the sealing edge form an integral structure. The connection strength between the first bladder piece, the second bladder piece and the sealing edge is relatively large, so that the structural strength of the connection area of the first bladder piece, the second bladder piece and the sealing edge is relatively large, improving the impact resistance and fatigue resistance of the connection area, reducing the possibility of cracks or fractures easily occurring in the connection area due to the reciprocating movement of the second bladder piece under alternating stress, and being beneficial to extending the service life of the elastic bladder.

[0026] In some realizable ways, along the length direction of the blade, two or more elastic bladders are arranged on the pressure surface. Two or more elastic bladders can facilitate more flexible adjustment of the aerodynamic shape of the wind turbine blade, so as to adjust the aerodynamic performance of the wind turbine blade, which is beneficial to improving the ability to adjust and optimize the aerodynamic performance of the wind turbine blade.

[0027] In some realizable ways, two or more elastic bladders are arranged at intervals along the length direction of the blade. There is a spacing between any two adjacent elastic bladders. On the one hand, there is no position interference between any two adjacent elastic bladders, making it easy to install and fix each elastic bladder on the pressure surface. On the other hand, when the second bladder expands, it is not easy for any two adjacent second bladders to squeeze each other, reducing the possibility that the shape of each elastic bladder does not conform to the expected shape due to the mutual extrusion of the second bladders.

[0028] In some realizable ways, along the length direction of the blade, the spacing between any two adjacent elastic bladder parts is 5 mm to 10 mm.

[0029] In some realizable ways, a protective coating is provided on the exposed surface of the elastic bladder.

[0030] The protective coating can play a protective role for the elastic bladder, which is beneficial to blocking substances such as water or sunlight, preventing the elastic bladder from aging and failing, and extending the service life of the elastic bladder.

[0031] In some realizable ways, the material of the elastic bladder includes ultraviolet absorbers.

[0032] The ultraviolet absorbers can efficiently absorb ultraviolet rays in sunlight, reducing the damage of ultraviolet rays to the elastic bladder, which is beneficial to extending the service life of the elastic bladder.

[0033] In some realizable ways, the material of the elastic bladder includes fiber materials, which is beneficial to increasing the structural strength of the elastic bladder, improving the anti-fatigue performance of the elastic bladder, and extending the service life of the elastic bladder.

[0034] In some realizable ways, the blade includes a hollow chamber, and the wind power blade further includes a fluid distribution device. At least part of the fluid distribution device is located in the hollow chamber. The fluid distribution device is connected to the elastic bladder and is in communication with the inner cavity.

[0035] The fluid distribution device can multiplex the hollow chamber of the blade to improve the space utilization rate of the hollow chamber and at the same time reduce the layout difficulty of the fluid distribution device.

[0036] In some realizable ways, the elastic bladder includes a fluid inlet and a fluid outlet provided on the first bladder piece. The fluid inlet and the fluid outlet are in communication with the inner cavity. The blade includes a first through hole and a second through hole penetrating the pressure surface. The wind power blade further includes a fluid distribution device. The fluid distribution device includes an input pipeline, an output pipeline, a first valve and a second valve. The input pipeline and the output pipeline respectively pass through the first through hole and the second through hole and are connected to the fluid inlet and the fluid outlet. The first valve and the second valve are configured to control the conduction or cut-off of the input pipeline and the output pipeline.

[0037] The way of arranging the first through hole and the second through hole on the blade enables the elastic bladder and the fluid distribution device to be connected through the input pipeline and the output pipeline, which is beneficial to reducing the connection difficulty between the elastic bladder and the fluid distribution device. After the first bladder piece is connected to the pressure surface, the first bladder piece can cover the first through hole and the second through hole, so that the first bladder piece can protect the first through hole and the second through hole and reduce the possibility of foreign objects, water and other substances entering the blade interior through the first through hole and the second through hole.

[0038] In some realizable ways, the blade includes 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.

[0039] Adjust the aerodynamic shape of the wind power blade through the elastic bladder when the wind power blade is in a rotating state. When the wind power blade is in a rotating state, the fluid medium filled into the inner cavity of the elastic bladder through the fluid inlet can relatively quickly fill the inner cavity under the action of centrifugal force, which is beneficial to improving the response rate and deformation rate of the shape change during the expansion of the elastic bladder.

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

[0041] In some feasible embodiments, the elastic bladder includes a fluid inlet / outlet provided on the first bladder piece. The fluid inlet / outlet is in communication with the inner cavity. The blade includes a through-hole penetrating the pressure surface. The wind power blade further includes a fluid distribution device. The fluid distribution device includes a pipeline and a valve. The pipeline passes through the through-hole and is connected to the fluid inlet / outlet. The valve is configured to control the conduction or cut-off of the pipeline.

[0042] The elastic bladder realizes the filling or discharging of the fluid medium through the fluid inlet / outlet, which is beneficial to reducing the number of openings on the elastic bladder and simultaneously beneficial to reducing the number of corresponding through-holes provided on the blade, and reducing the possibility of adversely affecting the structural strength of the blade due to the presence of a large number of through-holes on the blade.

[0043] This application provides a wind power generation set, which includes a wind power blade.

[0044] This application provides a manufacturing method of a wind power blade, which includes: Providing a blade, the blade includes a pressure surface and a suction surface oppositely arranged in the thickness direction, a leading edge and a trailing edge oppositely arranged in the width direction. The pressure surface includes a first region located between the maximum thickness of the blade and the leading edge and a second region located between the maximum thickness of the blade and the trailing edge; Providing an elastic bladder, the elastic bladder includes an inner cavity, a first bladder piece and a second bladder piece. The inner cavity is arranged between the first bladder piece and the second bladder piece. The first bladder piece is connected to at least one of the first region and the second region. The second bladder piece is located on the side of the first bladder piece facing away from the pressure surface.

[0045] In some feasible embodiments, the manufacturing method of the wind power blade includes: Providing a strip-shaped bonding part on the pressure surface; Providing an annular bonding part along the edge of the elastic bladder; Fitting the elastic bladder to the pressure surface, and connecting the elastic bladder and the pressure surface through the strip-shaped bonding part and the annular bonding part; Applying a compressive stress to the elastic bladder; After the strip-shaped bonding part and the annular bonding part are cured, stop applying the compressive stress to the elastic bladder.

[0046] The wind power blade, the wind power generation set and the manufacturing method of the wind power blade of this application have the following beneficial effects: In gusts with relatively high wind speeds or extreme wind conditions with relatively high wind speeds, by adjusting the volume of the elastic bladder, the aerodynamic shape of the wind power blade is adjusted to reduce the lift borne by the blade, realize blade load reduction, reduce the structural stress and deformation of the blade, and reduce the possibility of blade structural damage caused by blade overload in high-turbulence and high-shear wind conditions, which is beneficial to improving the operation safety and environmental adaptability of the wind power blade and extending the service life of the wind power blade. Description of the Drawings

[0047] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0048] Figure 1 Schematic structural diagram of a wind turbine generator provided for some embodiments of the present application; Figure 2 Partial structural schematic diagram of a wind turbine blade provided for some embodiments of the present application; Figure 3 Partial sectional structural schematic diagram of a wind turbine blade in a first state provided for some embodiments of the present application; Figure 4 Partial sectional structural schematic diagram of a wind turbine blade in a second state provided for some embodiments of the present application; Figure 5 For Figure 4 Enlarged schematic diagram at M in Figure 6 Partial sectional structural schematic diagram of an elastic bladder in an expanded state in a wind turbine blade provided for some embodiments of the present application; Figure 7 Partial sectional structural schematic diagram of an elastic bladder in an expanded state provided for some embodiments of the present application; Figure 8 Partial sectional structural schematic diagram of an elastic bladder in a contracted state provided for some embodiments of the present application; Figure 9 Partial sectional structural schematic diagram of an elastic bladder including an elastic partition wall provided for some embodiments of the present application; Figure 10 Partial structural schematic diagram of an elastic bladder including a fluid inlet and a fluid outlet in the same sub-chamber provided for some embodiments of the present application; Figure 11 Partial sectional structural schematic diagram of a wind turbine blade including the connection state of a blade and an elastic bladder provided for some embodiments of the present application; Figure 12 For Figure 11 Enlarged schematic diagram at P in Figure 13 Partial structural schematic diagram of an adhesive provided for some embodiments of the present application; Figure 14 Partial structural schematic diagram of the connection state between a protective member and an elastic bladder in a wind turbine blade provided for some embodiments of the present application; Figure 15 Partial sectional structural schematic diagram of a wind turbine blade including a protective member and a protective coating provided for some embodiments of the present application; Figure 16 Partial sectional structural schematic diagram of a wind turbine blade including a fluid distribution device provided for some embodiments of the present application; Figure 17 Schematic partial sectional view of the first connection method between the fluid distribution device and the elastic bladder provided in some embodiments of the present application; Figure 18 Schematic partial view of the elastic bladder provided in some embodiments of the present application, including fluid inlets and outlets in different sub-chambers; Figure 19 Schematic partial sectional view of the second connection method between the fluid distribution device and the elastic bladder provided in some embodiments of the present application.

[0049] In the drawings, the drawings are not necessarily drawn to actual scale.

[0050] Explanation of reference numerals: 10, Wind turbine generator set; 20, Tower barrel; 30, Nacelle; 40, Wind wheel; 50, Hub; 60, Wind turbine blade; 70, Blade; 701, Hollow chamber; 702, First through hole; 703, Second through hole; 704, Through hole; 71, Pressure surface; 711, First region; 712, Second region; 72, Suction surface; 73, Leading edge; 74, Trailing edge; 75, Root; 76, Tip; 80, Elastic bladder; 801, Inner cavity; 802, Sub-chamber; 803, First connection region; 804, Second connection region; 805, Fluid inlet; 806, Fluid outlet; 807, Fluid inlet and outlet; 81, First bladder piece; 82, Second bladder piece; 83, Elastic partition wall; 831, Fluid channel; 84, Sealing edge; 85, Protective coating; 90, Adhesive; 91, Annular adhesive part; 92, Strip-shaped adhesive part; 100, Protective part; 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 implementation manners

[0051] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and above-mentioned drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims or above-mentioned drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0053] Reference to "embodiment" in this application means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0054] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only for illustrative purposes and should not constitute any limitation to this application.

[0056] The "plurality" mentioned in this application means two or more (including two).

[0057] See Figure 1 As shown, an embodiment of this application provides a wind turbine 10. The wind turbine 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 wind turbine blades 60. The wind turbine blades 60 are connected to the hub 50. The hub 50 is connected to the main shaft of the nacelle 30. The wind turbine blades 60 can generate torque under the action of wind. The wind turbine blades 60 and the hub 50 drive the main shaft of the nacelle 30 to rotate, so that wind energy can be converted into mechanical energy. The main shaft of the nacelle 30 can be connected to the rotor of the generator, so that mechanical energy can be converted into electrical energy.

[0058] SeeFigures 2 to 5 As shown in the figure, an embodiment of the present application provides a wind turbine blade 60. The wind turbine blade 60 includes a blade 70 and an elastic bladder 80. The blade 70 includes a pressure surface 71 and a suction surface 72 that are oppositely arranged in the thickness direction X, and a leading edge 73 and a trailing edge 74 that are oppositely arranged in the 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 bladder 80 includes an inner cavity 801, a first bladder piece 81, and a second bladder piece 82. The inner cavity 801 is arranged between the first bladder piece 81 and the second bladder piece 82. The first bladder piece 81 is connected to at least one of the first region 711 and the second region 712. The second bladder piece 82 is located on the side of the first bladder piece 81 facing away from the pressure surface 71. The elastic bladder 80 is configured to switch between an expanded state and a contracted state. During the switching process between the expanded state and the contracted state, the second bladder piece 82 moves away from or closer to the first bladder piece 81, so that the volume of the inner cavity 801 of the elastic bladder 80 increases or decreases.

[0059] In the embodiment of the present application, the maximum thickness of the blade 70 refers to the position where the vertical 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.

[0060] In the embodiment 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 structural member 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. 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, the thickness of the blade 70 decreases.

[0061] The first region 711 and the second region 712 of the pressure surface 71 are arranged side by side in 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 transition between the first region 711 and the second region 712 is smooth.

[0062] In the embodiment of the present application, the first bladder piece 81 is connected to the first region 711. Alternatively, the first bladder piece 81 is connected to the second region 712. Alternatively, a part of the first bladder piece 81 is connected to the first region 711, and another part is connected to the second region 712.

[0063] In some feasible ways, Figures 3 to 5 Schematically shows the structural form in which the elastic bladder 80 is connected to the second region 712.

[0064] In the embodiments of the present application, the elastic bladder 80 itself has the performance of elastic deformation. When the inner cavity 801 of the elastic bladder 80 is filled with a fluid medium, the elastic bladder 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 bladder 80, the elastic bladder 80 can switch from an expanded state to a contracted state. Exemplarily, the fluid medium can be air or liquid.

[0065] In the embodiments of the present application, as shown in Figure 3 When the elastic bladder 80 is not filled with a fluid medium and is in a contracted state, the elastic bladder 80 can be in a flat structure. The first bladder piece 81 and the second bladder piece 82 are stacked on top of each other, and the volume of the inner cavity 801 is in the smallest state. The elastic bladder 80 can be attached to the surface of the blade 70, and the shape of the elastic bladder 80 has little or no impact on the overall aerodynamic shape of the wind turbine blade 60, so that the aerodynamic performance of the blade 70 can maintain its original aerodynamic performance.

[0066] As shown in Figure 4 and Figure 5 When the elastic bladder 80 is filled with a fluid medium and is in an expanded state, the second bladder piece 82 moves away from the first bladder piece 81, and the volume of the inner cavity 801 increases, causing the shape of the elastic bladder 80 to change. The shape of the elastic bladder 80 has an impact on the overall aerodynamic shape of the wind turbine blade 60, causing the overall aerodynamic shape of the wind turbine blade 60 to change, thereby reducing the lift force borne by the blade 70 and realizing load reduction of the blade 70. When the load on the blade 70 is reduced, the structural stress borne by the blade 70 is reduced, and the deformation amount is reduced.

[0067] In some feasible ways, the thickness of the first bladder piece 81 ranges from 1 mm to 2 mm. For example, the thickness of the first bladder piece 81 can be 1 mm, 1.5 mm, or 2 mm. The thickness of the second bladder piece 82 ranges from 1 mm to 2 mm. For example, the thickness of the second bladder piece 82 can be 1 mm, 1.5 mm, or 2 mm.

[0068] The wind turbine blade 60 of the embodiment of the present application includes a blade 70 and an elastic bladder 80. The wind turbine generator set 10 can adjust the aerodynamic shape of the wind turbine 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 turbine blade 60, which is beneficial to improving the overall power generation efficiency of the wind turbine generator set 10. In the case of gusts with relatively high wind speeds or extreme wind conditions with relatively high wind speeds, the aerodynamic shape of the wind turbine blade 60 is adjusted by adjusting the volume of the elastic bladder 80 to reduce the lift borne by the blade 70, achieve load reduction of the blade 70, reduce the structural stress and deformation of the blade 70, and reduce the possibility of structural damage to the blade 70 caused by overload of the blade 70 in high-turbulence and high-shear wind conditions, which is beneficial to improving the operation safety and environmental adaptability of the wind turbine blade 60 and extending the service life of the wind turbine blade 60. In addition, the wind turbine generator set 10 can reduce the load on the blade 70 by means of blade pitch change of the wind turbine blade 60 and deformation of the elastic bladder 80 at the same time, reducing the possibility of blade 70 overload caused by pitch lag when only relying on the blade pitch change of the wind turbine blade 60.

[0069] When the elastic bladder 80 disposed on the pressure surface 71 is in a contracted state, the shape of the elastic bladder 80 has little or no influence on the overall aerodynamic shape of the wind turbine blade 60, so that the aerodynamic performance of the blade 70 can maintain its original aerodynamic performance. When air flows through the blade 70, due to the design of the overall aerodynamic shape of the blade 70, higher pressure can be generated on the pressure surface 71 by the air, and lower pressure can be generated on the suction surface 72. When the blade 70 is operating, air will flow through the pressure surface 71. The air flow velocity on the pressure surface 71 is relatively slow and the pressure is relatively high. The air flow velocity on the suction surface 72 is relatively fast and the pressure is relatively low.

[0070] When the elastic bladder 80 disposed on the pressure surface 71 is in an expanded state, the overall aerodynamic shape of the wind turbine blade 60 formed by the blade 70 and the elastic bladder 80 changes, so that the pressure generated by the air on the windward surface of the wind turbine blade 60 itself can be reduced, so as to achieve overall load reduction of the wind turbine blade 60, and further achieve load reduction of the blade 70.

[0071] In the embodiment of the present application, by controlling the shape change of the elastic bladder 80 disposed on the pressure surface 71, the magnitude of the load borne by the overall wind turbine blade 60 can be controlled.

[0072] In some implementable ways, the elastic bladder 80 is connected to the second region 712. When the elastic bladder 80 is in an expanded state, along the thickness direction X of the blade 70, the second bladder piece 82 does not exceed the maximum thickness of the blade 70.

[0073] In some realizable ways, the elastic bladder 80 itself is a structurally independent component manufactured separately. The elastic bladder 80 and the blade 70 are of a split structure. The elastic bladder 80 can be assembled with the blade 70 to form the wind turbine blade 60.

[0074] In some examples, the elastic bladder 80 is adhesively fixed to the pressure side 71. Exemplarily, the elastic bladder 80 is adhesively fixed to the first region 711 of the pressure side 71. Alternatively, the elastic bladder 80 is adhesively fixed to the second region 712 of the pressure side 71. Alternatively, a part of the elastic bladder 80 is adhesively fixed to the first region 711 and another part is adhesively fixed to the second region 712.

[0075] In some realizable ways, the material of the elastic bladder 80 is an insulating material, which is beneficial to avoiding lightning strikes on the elastic bladder 80.

[0076] In some realizable ways, the material of the elastic bladder 80 includes but is not limited to rubber and polyurethane (TPU), enabling the elastic bladder 80 itself to have good elastic deformation ability, which is beneficial to improving the response rate of the shape change of the elastic bladder 80, and at the same time enabling the elastic bladder 80 to have good fatigue resistance and manufacturability.

[0077] In some realizable ways, along the length direction Z of the blade 70, the middle section of the blade 70 can be provided with the elastic bladder 80. On the one hand, it is beneficial to reduce the lift of part of the blade 70 by controlling the shape of the elastic bladder 80, so that the load of the blade 70 is controlled. On the other hand, when the elastic bladder 80 is in a contracted state, it is not easy to affect the aerodynamic performance of the middle section and the tip section 76 of the blade 70.

[0078] In some realizable ways, at least part of the inner wall of the elastic bladder 80 is a non-smooth surface, which reduces the possibility of adhesion or blockage of the fluid outlet on the inner wall of the elastic bladder 80 during the process of discharging the fluid, is beneficial to the elastic bladder 80 quickly emptying the fluid in the elastic bladder 80, and improves the deformation rate of the elastic bladder 80. 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.

[0079] When the elastic bladder 80 is in a contracted state, there are areas where the inner walls of the elastic bladder 80 come into contact with each other. When the elastic bladder 80 is in a contracted state, in the non-smooth surface area of the elastic bladder 80, the contact area between the inner walls of the elastic bladder 80 is relatively small, making it not easy for a large-area adhesion area to appear between the inner walls of the elastic bladder 80, which is beneficial to reducing the possibility that the expansion process of the elastic bladder 80 is subject to a large resistance due to the existence of a large-area adhesion area on the inner wall of the elastic bladder 80.

[0080] In some examples, the inner wall of at least one of the first bladder piece 81 and the second bladder piece 82 is a non-smooth surface.

[0081] In some implementable ways, as shown in Figures 6 to 8 the figure, the elastic bladder 80 further includes an elastic partition wall 83. The elastic partition wall 83 is located in the inner cavity 801. The first bladder piece 81 and the second bladder piece 82 are respectively connected to the elastic partition wall 83. When the second bladder piece 82 moves away from or close to the first bladder piece 81, the elastic partition wall 83 stretches or contracts.

[0082] The inner cavity 801 is divided into more than two sub-chambers 802 by the 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 communicate through the fluid channel 831. The fluid medium filled in the elastic bladder 80 can flow between different sub-chambers 802 through the fluid channel 831.

[0083] During the process of the elastic bladder 80 switching from the contracted state to the expanded state, the second bladder piece 82 moves away from the first bladder piece 81, and the second bladder piece 82 applies a tensile stress to the elastic partition wall 83 to stretch the elastic partition wall 83. During the deformation process of the second bladder piece 82, the elastic partition wall 83 can play a constraining role on the second bladder piece 82, so that the shape of the second bladder piece 82 after overall deformation can be controlled to meet the shape requirements by using the elastic partition wall 83, and the possibility that the overall shape of the elastic bladder 80 is not easy to reach the expected shape due to the free deformation of the second bladder piece 82 is reduced.

[0084] During the process of the elastic bladder 80 switching from the expanded state to the contracted state, the second bladder piece 82 moves close to the first bladder piece 81, and the second bladder piece 82 releases the elastic partition wall 83. Under the action of the elastic restoring force, the elastic partition wall 83 applies a tensile stress to the second bladder piece 82. Under the combined action of its own elastic restoring force and the elastic restoring force of the elastic partition wall 83, the second bladder piece 82 can switch from the expanded state to the contracted state relatively quickly, which is beneficial to improving the deformation rate of the elastic bladder 80, improving the response rate of the elastic bladder 80, and facilitating the elastic bladder 80 to complete the shape adjustment in a relatively short time, so that the wind turbine blade 60 can adjust the aerodynamic performance in a relatively short time.

[0085] When the elastic bladder 80 is in the contracted state, the elastic partition wall 83 can play a role in tightening and constraining the second bladder piece 82, so that the second bladder piece 82 is kept in a fitting state with the first bladder piece 81, and the possibility that the aerodynamic shape of the wind turbine blade 60 is adversely affected due to the accidental detachment of the second bladder piece 82 from the fitting state with the first bladder piece 81 is reduced.

[0086] In some examples, the elastic partition wall 83 can be a sheet-like structure. The thickness of the elastic partition wall 83 can range from 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.

[0087] In some examples, the number of the elastic partition walls 83 is one. One elastic partition wall 83 divides the inner cavity 801 into two sub-chambers 802.

[0088] In some examples, the number of the 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.

[0089] In some examples, the fluid channel 831 on the elastic partition wall 83 can be a pore structure.

[0090] In some examples, the material of the elastic partition wall 83 includes but is not limited to rubber and polyurethane. The material of the first bladder piece 81 can include but is not limited to rubber and polyurethane. The material of the second bladder piece 82 can include but is not limited to rubber and polyurethane.

[0091] In some examples, the material of the elastic partition wall 83 can be the same as or different from the material of the first bladder piece 81. The material of the first bladder piece 81 can be the same as or different from the material of the second bladder piece 82.

[0092] In some implementable ways, as shown in Figure 7 As shown, the number of the elastic partition walls 83 is more than two. More than two elastic partition walls 83 are arranged at intervals along the length direction Z or the width direction Y of the blade 70. More than two elastic partition walls 83 divide the inner cavity 801 into more than three sub-chambers 802. One sub-chamber 802 is arranged on each side of each elastic partition wall 83.

[0093] More than two elastic partition walls 83 are arranged at intervals along the length direction Z of the blade 70. Each sub-chamber 802 is arranged at intervals along the length direction Z of the blade 70. Or, more than two elastic partition walls 83 are arranged at intervals along the width direction Y of the blade 70. Each sub-chamber 802 is arranged at intervals along the width direction Y of the blade 70.

[0094] More than two elastic partition walls 83 are distributed at different positions in the inner cavity 801. During the deformation of the second bladder piece 82, more than two elastic partition walls 83 can play a constraining role on the second bladder piece 82 at different positions, which is beneficial to further accurately controlling the shape of the second bladder piece 82 after overall deformation to meet the shape requirements through more than two elastic partition walls 83.

[0095] In some implementable ways, as shown in Figure 7 and Figure 8As shown, the elastic partition wall 83 is connected to the first bladder piece 81 to form a first connection area 803. The elastic partition wall 83 is connected to the second bladder piece 82 to form a second connection area 804. Along 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.

[0096] When the elastic bladder 80 is in a contracted state, the first connection area 803 and the second connection area 804 are arranged staggeredly from each other, and their positions do not correspond to each other, so that the first bladder piece 81, the elastic partition wall 83, and the second bladder piece 82 are in a mutually stacked state, which is beneficial to reducing the possibility that the area of the second bladder piece 82 corresponding to the elastic partition wall 83 bulges too high due to the local elevation of the second bladder piece 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 excessive protrusion of the second bladder piece 82.

[0097] When the elastic bladder 80 is in an expanded state, the elastic partition wall 83 is inclined relative to the first bladder piece 81 and the second bladder piece 82, so that the first connection area 803 and the second connection area 804 are arranged staggeredly from each other, and their positions do not correspond to each other.

[0098] In some implementable ways, refer to Figure 2 and Figure 9 As shown, the blade 70 includes a blade root 75 and a blade tip 76 that are oppositely arranged along the length direction Z. More than two sub-chambers 802 are arranged at intervals 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 channel 831 is arranged at the end of the elastic partition wall 83 close to the blade tip 76.

[0099] When the wind turbine blade 60 is rotating, the aerodynamic shape of the wind turbine blade 60 is adjusted by the elastic bladder 80. The fluid channel 831 is arranged at the end of the elastic partition wall 83 close to the blade tip 76. Therefore, when the wind turbine blade 60 is rotating, the fluid medium in the inner cavity 801 of the elastic bladder 80 can be relatively quickly filled into each sub-chamber 802 or discharged from each sub-chamber 802 through the fluid channel 831 under the action of centrifugal force, which is beneficial to improving the response rate and deformation rate of the shape change of the elastic bladder 80.

[0100] In some implementable ways, the first bladder piece 81, the second bladder piece 82, and the elastic partition wall 83 are an integrally formed structure.

[0101] The first bladder piece 81, the second bladder piece 82, and the elastic partition wall 83 form an integral structure. The connection strength between the first bladder piece 81, the second bladder piece 82, and the elastic partition wall 83 is relatively large, such that the structural strength of the first bladder piece 81, the second bladder piece 82, and the elastic partition wall 83 in the first connection region 803 and the second connection region 804 is relatively large, improving the impact resistance and fatigue resistance of the first connection region 803 and the second connection region 804, reducing the possibility that at least one of the first connection region 803 and the second connection region 804 bears alternating stress due to the reciprocating movement of the second bladder piece 82 and is prone to cracks or fractures, and being beneficial to extending the service life of the elastic bladder 80.

[0102] In some examples, the materials of the first bladder piece 81, the second bladder piece 82, and the elastic partition wall 83 are the same.

[0103] In some implementable ways, referring to Figure 9 and Figure 10 as shown, the elastic bladder 80 includes a sealing edge 84 surrounding the inner cavity 801. The first bladder piece 81 and the second bladder piece 82 are respectively connected to the sealing edge 84. The sealing edge 84 is connected to the pressure surface 71. Along the direction away from the inner cavity 801, the thickness of the sealing edge 84 gradually decreases.

[0104] The inner cavity 801 of the elastic bladder 80 does not extend into the sealing edge 84. When the second bladder piece 82 of the elastic bladder 80 expands or contracts, the position of the sealing edge 84 on the pressure surface 71 does not change. The sealing edge 84 of the elastic bladder 80 does not expand or contract.

[0105] The elastic bladder 80 is connected to the pressure surface 71 through the first bladder piece 81 and the sealing edge 84, increasing the connection area between the elastic bladder 80 and the pressure surface 71, being beneficial to improving the connection strength and connection stability between the elastic bladder 80 and the pressure surface 71, and reducing the possibility that the elastic bladder 80 separates from the blade 70 due to the reciprocating expansion or contraction of the elastic bladder 80.

[0106] The sealing edge 84 is arranged to surround the first bladder piece 81. The sealing edge 84 can play a role of limiting and constraining the first bladder piece 81. When the second bladder piece 82 expands, the second bladder piece 82 will apply a tensile stress to the first bladder piece 81. Since the first bladder piece 81 is restricted by the sealing edge 84, the acting force borne by the first bladder piece 81 can be dispersed to the sealing edge 84 and the blade 70, reducing the possibility that the edge of the first bladder piece 81 separates from the pressure surface 71 and turns up due to being pulled by the second bladder piece 82.

[0107] Along the direction away from the inner cavity 801, the thickness of the sealing edge 84 gradually decreases, enabling a smooth transition between the sealing edge 84 and the pressure surface 71, being beneficial to reducing the possibility that the outer shape of the sealing edge 84 has an adverse effect on the aerodynamic shape of the wind turbine blade 60.

[0108] In some examples, the edge seal 84 can be a solid structural member.

[0109] In some implementable ways, referring to Figure 10 as shown, the elastic bladder 80 can include a fluid inlet 805 and a fluid outlet 806 provided on the first bladder sheet 81. The fluid inlet 805 and the fluid outlet 806 communicate with the inner cavity 801.

[0110] 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 provided in the region of the first bladder sheet 81 corresponding to the middle sub-chamber 802. Exemplarily, 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 provided in the region of the first bladder sheet 81 corresponding to the middle second sub-chamber 802.

[0111] When it is necessary to control the expansion of the elastic bladder 80, the fluid medium input through the fluid inlet 805 can flow to the sub-chambers 802 on both sides, which is beneficial to improving the expansion rate and deformation consistency of the elastic bladder 80.

[0112] When it is necessary to control the contraction of the elastic bladder 80, the fluid medium in the sub-chambers 802 on both sides can be discharged through the fluid outlet 806, which is beneficial to improving the consistency of the discharge rate of the fluid medium in the sub-chambers 802 on both sides, and thus is beneficial to improving the contraction rate and deformation consistency of the elastic bladder 80.

[0113] In some implementable ways, referring to Figure 11 and Figure 12 as shown, the wind turbine blade 60 further includes an adhesive member 90. The first bladder sheet 81 and the edge seal 84 are adhesively bonded to the pressure surface 71 through the adhesive member 90.

[0114] The first bladder sheet 81 and the edge seal 84 are each connected and fixed to the pressure surface 71 by an adhesive bonding method. On the one hand, it is beneficial to reduce the connection operation difficulty between the elastic bladder 80 and the blade 70. On the other hand, there is no need to additionally provide a connection structure on the elastic bladder 80 and the blade 70, which is beneficial to reducing the processing difficulty of the elastic bladder 80 and the blade 70.

[0115] In some examples, the first bladder sheet 81 and the edge seal 84 are adhesively bonded to the first region 711 through the adhesive member 90. Or, the first bladder sheet 81 and the edge seal 84 are adhesively bonded to the second region 712 through the adhesive member 90. Or, a part of each of the first bladder sheet 81 and the edge seal 84 is adhesively bonded to the first region 711 through the adhesive member 90, and the other part of each is adhesively bonded to the second region 712 through the adhesive member 90.

[0116] In some examples, the bonding member 90 may include, but is not limited to, adhesive. For example, the adhesive includes acrylate adhesive.

[0117] In some examples, the thickness of the bonding member 90 ranges from 0.5 mm to 1 mm. For example, the thickness of the bonding member 90 can be 0.5 mm, 0.8 mm, or 1 mm.

[0118] In some examples, the edge seal 84 can be a rectangular structure with four sides.

[0119] In some examples, the width of the edge seal 84 can range from 30 mm to 50 mm. Exemplarily, the width of the edge seal 84 can be 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm.

[0120] The way that the width of the edge seal 84 ranges from 30 mm to 50 mm is beneficial in that, on the one hand, it helps ensure that the edge seal 84 itself has good structural strength, on the other hand, it helps ensure that there is a large connection area between the edge seal 84 and the pressure surface 71, improving the connection strength between the edge seal 84 and the pressure surface 71, and on yet another hand, it helps achieve a smooth transition between the edge seal 84 and the pressure surface 71.

[0121] In some examples, the surface of the edge seal 84 facing away from the pressure surface 71 is an inclined surface. The slope of the inclined surface ranges from 1:50 to 1:10, which is beneficial for ensuring a smooth transition between the edge seal 84 and the pressure surface 71 and reducing the possibility that the shape of the edge seal 84 has an adverse effect on the aerodynamic shape of the wind turbine blade 60. Exemplarily, the slope of the inclined surface can be 1:50, 1:40, 1:30, 1:20, or 1:10.

[0122] In some examples, the first bladder 81, the second bladder 82, and the edge seal 84 are an integrally formed structure.

[0123] The first bladder 81, the second bladder 82, and the edge seal 84 form an integral structure. The connection strength between the first bladder 81, the second bladder 82, and the edge seal 84 is relatively large, such that the structural strength of the connection area between the first bladder 81, the second bladder 82, and the edge seal 84 is relatively large, improving the impact resistance and fatigue resistance of the connection area, and reducing the possibility of cracks or fractures occurring in the connection area due to the reciprocating movement of the second bladder 82 under alternating stress, which is beneficial for extending the service life of the elastic bladder 80.

[0124] In some examples, the first bladder 81, the second bladder 82, and the edge seal 84 are made of the same material.

[0125] In some examples, the bonding member 90 can cover the entire surface of the first bladder 81 and the edge seal 84 facing the pressure surface 71.

[0126] In some examples, refer to Figure 13 As shown, the bonding member 90 may include an annular bonding portion 91 and a strip-shaped bonding portion 92. The strip-shaped bonding portion 92 is located within the annular bonding portion 91. The first bladder piece 81 is bonded to the strip-shaped bonding portion 92. The edge seal 84 is bonded to the annular bonding portion 91.

[0127] The elastic bladder 80 is bonded and fixed to the pressure surface 71 through the annular bonding portion 91 and the strip-shaped bonding portion 92, which is beneficial to reducing the usage amount of the adhesive and lowering the cost while ensuring the connection strength.

[0128] Exemplarily, both ends of the strip-shaped bonding portion 92 are respectively connected to the annular bonding portion 91.

[0129] Exemplarily, the number of the strip-shaped bonding portions 92 is more than two. The more than two strip-shaped bonding portions 92 are arranged at intervals.

[0130] In some realizable ways, refer to Figure 12 and Figure 14 As shown, the wind turbine blade 60 further includes a protective member 100. The protective member 100 is disposed around the edge seal 84. At least one of the edge seal 84, the bonding member 90, and the pressure surface 71 is connected to the protective member 100. The protective member 100 covers the outer side surfaces of the edge seal 84 and the bonding member 90, such that the outer side surfaces of the edge seal 84 and the bonding member 90 are not exposed.

[0131] The protective member 100 can form a protection for the edge seal 84 and the bonding member 90 at the periphery thereof, which is beneficial to blocking substances such as water or sunlight, preventing the bonding member 90 from aging, deforming or failing, and also beneficial to reducing the possibility of connection failure between the edge seal 84 and the bonding member 90 and connection failure between the bonding member 90 and the pressure surface 71.

[0132] In some examples, the edge seal 84, the bonding member 90, and the pressure surface 71 are all connected to the protective member 100, which is beneficial to further improving the sealing effect and protection effect of the protective member 100.

[0133] In some examples, the material of the protective member 100 includes but is not limited to silicone.

[0134] In some examples, the edge seal 84 is a rectangular structure. The protective member 100 is a rectangular structure.

[0135] In some examples, along the direction away from the inner cavity 801, the thickness of the protective member 100 gradually decreases, such that a smooth transition can be achieved between the protective member 100 and the pressure surface 71, which is beneficial to reducing the possibility that the shape of the protective member 100 has an adverse effect on the aerodynamic shape of the wind turbine blade 60.

[0136] In some feasible embodiments, along the length direction Z of the blade 70, two or more elastic capsules 80 are provided on the pressure surface 71.

[0137] Two or more elastic capsules 80 can facilitate more flexible adjustment of the aerodynamic profile of the wind turbine blade 60 to adjust the aerodynamic performance of the wind turbine blade 60, which is beneficial to enhancing the ability to adjust and optimize the aerodynamic performance of the wind turbine blade 60.

[0138] In some examples, two or more elastic capsules 80 are arranged at intervals along the length direction Z of the blade 70. There is a spacing between any two adjacent elastic capsules 80. On the one hand, there is no positional interference between any two adjacent elastic capsules 80, making it easy to install and fix each elastic capsule 80 on the pressure surface 71. On the other hand, when the second capsule piece 82 expands, it is not easy for any two adjacent second capsule pieces 82 to squeeze each other, reducing the possibility that the shape of each elastic capsule 80 does not conform to the expected shape due to the mutual extrusion of the second capsule pieces 82.

[0139] Exemplarily, along the length direction Z of the blade 70, the spacing between any two adjacent elastic capsules 80 is 5 mm to 10 mm. For example, the spacing between any two adjacent elastic capsules 80 is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm.

[0140] In some examples, each elastic capsule 80 is configured to be individually controlled to achieve expansion or contraction.

[0141] In some feasible embodiments, referring to Figure 15 As shown, a protective coating 85 is provided on the exposed surface of the elastic capsule 80. The protective coating 85 can play a protective role for the elastic capsule 80, which is beneficial to blocking substances such as water or sunlight, preventing the elastic capsule 80 from aging and failing, and extending the service life of the elastic capsule 80.

[0142] In some examples, protective coatings 85 are provided on the exposed surfaces of the second capsule piece 82 and the edge seal 84 respectively. The surface of the first capsule piece 81 facing the pressure surface 71 may not be provided with a protective coating 85.

[0143] In some examples, the material of the protective coating 85 may include but is not limited to polyurethane.

[0144] In some examples, the thickness range of the protective coating 85 can be 0.2 mm to 0.4 mm. For example, the thickness of the protective coating 85 can be 0.2 mm, 0.3 mm, 0.4 mm.

[0145] In some practicable embodiments, the material of the elastic capsule 80 includes an ultraviolet absorber, which can efficiently absorb ultraviolet rays in sunlight, reduce the damage of ultraviolet rays to the elastic capsule 80, and help extend the service life of the elastic capsule 80.

[0146] In some examples, the UV absorber may include, but is not limited to, UV-326.

[0147] In some achievable embodiments, the material of the elastic bladder 80 includes fiber material, which helps to increase the structural strength of the elastic bladder 80 , improve the fatigue resistance of the elastic bladder 80 , and help to extend the service life of the elastic bladder 80 .

[0148] In some examples, the fiber material may include, but is not limited to, glass fiber, carbon fiber.

[0149] In some possible implementations, see Figure 16 As shown, the blade 70 includes a hollow chamber 701 . The wind turbine blade 60 also 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 to the elastic bladder 80 . The fluid distribution device 110 is in communication with the inner chamber 801 .

[0150] The fluid distribution device 110 is configured to control the filling of the fluid medium into the inner cavity 801 of the elastic bladder 80 or control the discharge of the fluid medium in the inner cavity 801 of the elastic bladder 80 , so as to control the shape of the elastic bladder 80 .

[0151] When the wind speed and 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 a contracted state. When the wind speed and 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 an expanded state to reduce the load on the wind turbine blade 60 and ensure the structural safety of the wind turbine blade 60.

[0152] The fluid distribution device 110 can reuse the hollow chamber 701 of the blade 70 to improve the space utilization of the hollow chamber 701 and reduce the difficulty of arranging the fluid distribution device 110 .

[0153] In some examples, fluid dispensing device 110 may include a pump for delivering the fluid medium.

[0154] 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 inner cavity 801 of the elastic bladder 80 with air 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 to contract the elastic bladder 80.

[0155] In some examples, the number of elastic bladders 80 is more than two. The number of fluid distribution devices 110 can be more than two. The number of elastic bladders 80 and the number of fluid distribution devices 110 are set in one-to-one correspondence. One fluid distribution device 110 can independently control the expansion or contraction of one elastic bladder 80.

[0156] In some examples, the number of elastic bladders 80 is more than two. The number of fluid distribution devices 110 can be one. One fluid distribution device 110 can simultaneously control the expansion or contraction of multiple elastic bladders 80.

[0157] In some realizable ways, as shown in Figure 17 The elastic bladder 80 includes a fluid inlet 805 and a fluid outlet 806 provided on the first bladder piece 81. The fluid inlet 805 and the fluid outlet 806 communicate 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 turbine 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 respectively pass through the first through hole 702 and the second through hole 703 and are connected to the fluid inlet 805 and the fluid outlet 806. The first valve 113 and the second valve 114 are configured to control the conduction or cut-off of the input pipeline 111 and the output pipeline 112.

[0158] The way of arranging the first through hole 702 and the second through hole 703 on the blade 70 enables the elastic bladder 80 and the fluid distribution device 110 to be connected through the input pipeline 111 and the output pipeline 112, which is beneficial to reducing the connection difficulty between the elastic bladder 80 and the fluid distribution device 110.

[0159] After the first bladder piece 81 is connected to the pressure surface 71, the first bladder piece 81 can cover the first through hole 702 and the second through hole 703, so that the first bladder piece 81 can protect the first through hole 702 and the second through hole 703 and reduce the possibility of foreign objects, water and other substances entering the inside of the blade 70 through the first through hole 702 and the second through hole 703.

[0160] When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the contracted state to the expanded state, the second valve 114 is closed so that the output pipeline 112 is cut off, and the first valve 113 is opened so that the input pipeline 111 is conducted, so as to fill the inner cavity 801 of the elastic bladder 80 with a fluid medium through the input pipeline 111 and the fluid inlet 805, so as to expand the elastic bladder 80. When the elastic bladder 80 expands to a predetermined shape, the first valve 113 is closed so that the input pipeline 111 is cut off.

[0161] When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the expanded state to the contracted state, the second valve 114 is opened so that the output pipeline 112 is conducted, and the fluid medium in the inner cavity 801 of the elastic bladder 80 is discharged through the output pipeline 112. When the elastic bladder 80 contracts to a predetermined shape, the second valve 114 is closed so that the output pipeline 112 is cut off.

[0162] In some examples, the first valve 113 may include but is not limited to a solenoid valve and a hydraulic valve. The second valve 114 may include but is not limited to a solenoid valve and a hydraulic valve.

[0163] In some examples, refer to Figure 2 and Figure 18 As shown, the blade 70 includes a blade root 75 and a blade tip 76 that are oppositely arranged along the length direction Z. Along the length direction Z of the blade 70, the fluid inlet 805 is arranged close to the blade root 75. The fluid outlet 806 is arranged close to the blade tip 76.

[0164] When the wind power blade 60 is in a rotating state, the aerodynamic shape of the wind power blade 60 is adjusted through the elastic bladder 80. When the wind power blade 60 is in a rotating state, the fluid medium filled into the inner cavity 801 of the elastic bladder 80 through the fluid inlet 805 can relatively quickly fill the inner cavity 801 under the action of centrifugal force, which is beneficial to improving the response rate and deformation rate of the shape change during the expansion process of the elastic bladder 80.

[0165] When the wind power blade 60 is in a rotating state, the fluid medium in the inner cavity 801 of the elastic bladder 80 can be discharged from the fluid outlet 806 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 80.

[0166] In some examples, the number of fluid inlets 805 may be one or more than two. The number of fluid outlets 806 may be one or more than two.

[0167] In some implementable ways, refer to Figure 19As shown, the elastic bladder 80 includes a fluid inlet / outlet 807 provided on the first bladder piece 81. The fluid inlet / outlet 807 communicates 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 passes through the through-hole 704 and is connected to the fluid inlet / outlet 807. The valve 116 is configured to control the conduction or cutoff of the pipeline 115.

[0168] The term "fluid inlet / outlet 807" refers to a single opening of the elastic bladder 80. This single opening is used both as an inlet and an outlet, and thus is defined as the fluid inlet / outlet 807. This term does not refer to separate inlets and outlets. The fluid medium can enter the interior of the elastic bladder 80 or be discharged from the interior of the elastic bladder 80 via the fluid inlet / outlet 807.

[0169] The elastic bladder 80 realizes the filling or discharging of the fluid medium through the fluid inlet / outlet 807, which is beneficial to reducing the number of openings on the elastic bladder 80 and at the same time beneficial to reducing the number of corresponding through-holes 704 provided on the blade 70, and reducing the possibility of adversely affecting the structural strength of the blade 70 due to the opening of a large number of through-holes 704 on the blade 70.

[0170] 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 to make the pipeline 115 conductive, so as to fill the inner cavity 801 of the elastic bladder 80 with the fluid medium through the pipeline 115 and the fluid inlet / outlet 807, so that the elastic bladder 80 expands. When the elastic bladder 80 expands to a predetermined shape, the valve 116 is closed to make the pipeline 115 cutoff.

[0171] When the fluid distribution device 110 needs to control the elastic bladder 80 to switch from the expanded state to the contracted state, the valve 116 is opened to make the pipeline 115 conductive, 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 contracts to a predetermined shape, the valve 116 is closed to make the pipeline 115 cutoff.

[0172] In some examples, the valve 116 may include, but is not limited to, a solenoid valve and a hydraulic valve.

[0173] The embodiment of the present application provides a manufacturing method of a wind turbine blade 60, which includes: Providing a blade 70, the blade 70 includes a pressure surface 71 and a suction surface 72 oppositely arranged along the thickness direction X, a leading edge 73 and a trailing edge 74 oppositely arranged along the width direction Y, the pressure surface 71 includes a first region 711 located between the maximum thickness of the blade 70 and the leading edge 73 and a second region 712 located between the maximum thickness of the blade 70 and the trailing edge 74; Provide an elastic bladder 80, the elastic bladder 80 includes an inner cavity 801, a first bladder piece 81 and a second bladder piece 82. The inner cavity 801 is arranged between the first bladder piece 81 and the second bladder piece 82. Connect the first bladder piece 81 to at least one of the first region 711 and the second region 712. The second bladder piece 82 is located on the side of the first bladder piece 81 facing away from the pressure surface 71.

[0174] The manufacturing method of the wind turbine blade 60 in the embodiment of the present application can be used to manufacture the wind turbine blade 60 in the above embodiment.

[0175] In some examples, the manufacturing method of the wind turbine blade 60 includes: Set a strip-shaped bonding part 92 on the pressure surface 71; Set an annular bonding part 91 along the edge of the elastic bladder 80; Attach the elastic bladder 80 to the pressure surface 71. The elastic bladder 80 and the pressure surface 71 are connected through the strip-shaped bonding part 92 and the annular bonding part 91; Apply a compressive stress to the elastic bladder 80; After the strip-shaped bonding part 92 and the annular bonding part 91 are cured, stop applying the compressive stress to the elastic bladder 80.

[0176] The elastic bladder 80 and the pressure surface 71 are connected and fixed by bonding. On the one hand, it is beneficial to reduce the difficulty of connecting the elastic bladder 80 and the blade 70. On the other hand, there is no need to additionally set connection structures on the elastic bladder 80 and the blade 70, which is beneficial to reducing the assembly difficulty of the elastic bladder 80 and the blade 70.

[0177] After the elastic bladder 80 and the blade 70 are bonded, continuously applying a compressive stress to the elastic bladder 80 is beneficial to reducing the possibility that the elastic bladder 80 rebounds and causes the separation of the elastic bladder 80 and the blade 70.

[0178] Exemplarily, the cross-section of the strip-shaped bonding part 92 provided on the pressure surface 71 is triangular. The elastic bladder 80 can squeeze the strip-shaped bonding part 92 so that the strip-shaped bonding part 92 can gradually expand and increase in width, which is convenient for ensuring the uniform width of the strip-shaped bonding part 92.

[0179] Exemplarily, two or more strip-shaped bonding parts 92 are provided on the pressure surface 71. The two or more strip-shaped bonding parts 92 are arranged at intervals. The distance between any two adjacent strip-shaped bonding parts 92 can range from 90 mm to 110 mm. For example, the distance between any two adjacent strip-shaped bonding parts 92 can be 90 mm, 100 mm, 110 mm.

[0180] Exemplarily, during the process of the elastic bladder 80 being attached to the pressure surface 71, one side of the elastic bladder 80 is gently placed at one end of the strip-shaped bonding portion 92, and then a flat plate is used to press the elastic bladder 80, gradually attaching the elastic bladder 80 to the pressure surface 71. By pressing the elastic bladder 80 with a flat plate, the excess adhesive can be extruded.

[0181] Exemplarily, an object such as a sandbag can be placed on the elastic bladder 80 to continuously apply compressive stress to the elastic bladder 80.

[0182] Exemplarily, after the strip-shaped bonding portion 92 and the annular bonding portion 91 are cured, the adhesive exposed around the elastic bladder 80 is trimmed. There may be a situation where a step is formed or the bonding is not full between the trimmed adhesive and the pressure surface 71. A protective member 100 is provided around the elastic bladder 80 and the adhesive to achieve a smooth transition with the pressure surface 71 through the protective member 100. The protective member 100 covers the outer side surface of the elastic bladder 80 and the outer side surface of the adhesive.

[0183] For example, silicone is used to coat around the elastic bladder 80 and the adhesive to achieve a smooth transition with the pressure surface 71 through the silicone. The cured silicone forms the protective member 100.

[0184] Exemplarily, two or more elastic bladders 80 are provided on the blade 70. The two or more elastic bladders 80 are arranged at intervals to facilitate trimming and cleaning of the adhesive extruded between two adjacent elastic bladders 80.

[0185] The manufacturing method of the wind turbine blade 60 according to the embodiment of the present application is used to manufacture the wind turbine blade 60. The wind turbine blade 60 manufactured by applying the manufacturing method of the wind turbine blade 60 includes a blade 70 and an elastic bladder 80. Under gusts with a relatively high wind speed or extreme wind conditions with a relatively high wind speed, by adjusting the volume of the elastic bladder 80, the aerodynamic shape of the wind turbine blade 60 is adjusted to reduce the lift borne by the blade 70, achieve load reduction of the blade 70, reduce the structural stress and deformation amount of the blade 70, and reduce the possibility of structural damage of the blade 70 caused by overload of the blade 70 under wind conditions with high turbulence and high shear. This is beneficial to improving the operation safety and environmental adaptability of the wind turbine blade 60 and extending the service life of the wind turbine blade 60.

[0186] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it without departing from the scope of the present application, and components therein can be replaced with equivalents. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wind turbine blade, characterized in that: include: A blade, comprising a pressure surface and a suction surface arranged opposite to each other in a thickness direction, and a leading edge and a trailing edge arranged opposite to each other in a width direction, wherein the pressure surface comprises a first region located between a maximum thickness of the blade and the leading edge, and a second region located between a 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, wherein 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, and the second capsule sheet is located on a side of the first capsule sheet facing away from the pressure surface. The elastic bladder is configured to switch between an expanded state and a contracted state. During the switching process between the expanded state and the contracted state, the second bladder sheet moves away from or approaches the first bladder sheet to increase or decrease the inner cavity volume of the elastic bladder.

2. The wind turbine blade according to claim 1, characterized in that: At least part of the inner wall of the elastic bladder is a non-smooth surface.

3. The wind turbine blade according to claim 1, characterized in that: The elastic capsule body further comprises an elastic partition wall, the elastic partition wall is located in the inner cavity, the first capsule sheet and the second capsule sheet are respectively connected to the elastic partition wall, and when the second capsule sheet moves away from or approaches the first capsule sheet, the elastic partition wall stretches or contracts. The inner cavity is divided into two or more sub-chambers by the elastic partition wall. The elastic partition wall includes a fluid channel. The sub-chambers on both sides of the elastic partition wall are connected through the fluid channel.

4. The wind turbine blade according to claim 3, characterized in that: The number of the elastic partition walls is more than two, and the more than two elastic partition walls are arranged at intervals along the length direction or the width direction of the blade, and one sub-chamber is respectively arranged on both sides of each elastic partition wall.

5. The wind turbine blade according to claim 3, characterized in that: The elastic partition wall is connected to the first capsule to form a first connection area, and the elastic partition wall is connected to the second capsule to form a second connection area. Along a direction perpendicular to the pressure surface, an orthographic projection of the first connection area does not overlap with an orthographic projection of the second connection area.

6. The wind turbine blade according to claim 3, characterized in that: The blade comprises a blade root and a blade tip which are arranged opposite to each other along the 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 channel is arranged at the end of the elastic partition wall close to the blade tip.

7. The wind turbine blade according to claim 3, characterized in that: The first capsule, the second capsule and the elastic partition wall are an integrally formed structure.

8. The wind turbine blade according to claim 1, characterized in that: The elastic bladder body includes a sealing edge surrounding the inner cavity, the first bladder sheet and the second bladder sheet are respectively connected to the sealing edge, 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.

9. The wind turbine blade according to claim 8, characterized in that: The wind turbine blade further includes an adhesive component, through which the first capsule and the edge seal are bonded to the pressure surface.

10. The wind turbine blade according to claim 9, characterized in that: The wind turbine blade further comprises a protective member, which is arranged around the edge seal. At least one of the edge seal, the adhesive component and the pressure surface is connected to the protective component, and the protective component covers the outer side surface of the edge seal and the outer side surface of the adhesive component.

11. The wind turbine blade according to claim 9, characterized in that: The adhesive member includes an annular adhesive portion and a strip adhesive portion, wherein the strip adhesive portion is located inside the annular adhesive portion. The first capsule is bonded to the strip-shaped bonding portion, and the edge seal is bonded to the annular bonding portion.

12. The wind turbine blade according to claim 8, characterized in that: The width of the edge banding ranges from 30 mm to 50 mm.

13. The wind turbine blade according to claim 8, characterized in that: The surface of the edge seal facing away from the pressure surface is an inclined surface, and the slope of the inclined surface ranges from 1:50 to 1:

10.

14. The wind turbine blade according to claim 8, characterized in that: The first caplet, the second caplet and the edge seal are an integrally formed structure.

15. The wind turbine blade according to claim 1, characterized in that: Along the length direction of the blade, more than two elastic bladders are arranged on the pressure surface.

16. The wind turbine blade according to claim 15, characterized in that: The two or more elastic sacs are arranged at intervals along the length direction of the blade.

17. The wind turbine blade according to claim 16, characterized in that: Along the length direction of the blade, the distance between any two adjacent elastic bladder parts is 5 mm to 10 mm.

18. The wind turbine blade according to claim 1, characterized in that: A protective coating is provided on the exposed surface of the elastic bladder.

19. The wind turbine blade according to claim 1, characterized in that: The material of the elastic capsule includes an ultraviolet absorber; and / or, The material of the elastic bladder includes fiber material.

20. The wind turbine blade according to claim 1, characterized in that: The blade includes a hollow chamber, and the wind turbine blade also includes a fluid distribution device, at least part of which is located in the hollow chamber, connected to the elastic bladder, and communicated with the inner cavity.

21. The wind turbine blade according to claim 1, characterized in that: The elastic capsule includes a fluid inlet and a fluid outlet arranged on the first capsule sheet, the fluid inlet and the fluid outlet are connected to the inner cavity, and the blade includes a first through hole and a second through hole penetrating the pressure surface. The wind turbine blade also includes a fluid distribution device, which includes an input pipeline, an output pipeline, a first valve and a second valve. The input pipeline and the output pipeline pass through the first through hole and the second through hole respectively and are connected to the fluid inlet and the fluid outlet. The first valve and the second valve are configured to control the input pipeline and the output pipeline to be turned on or off.

22. The wind turbine blade according to claim 21, characterized in that: The blade comprises a blade root and a blade tip which are arranged opposite to each other 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.

23. The wind turbine blade according to claim 1, characterized in that: The elastic capsule includes a fluid inlet and outlet disposed on the first capsule sheet, the fluid inlet and outlet are connected to the inner cavity, and the blade includes a through hole penetrating the pressure surface. The wind turbine blade further comprises a fluid distribution device, which comprises a pipeline and a valve. The pipeline passes through the through hole and is connected to the fluid inlet and outlet. The valve is configured to control the pipeline to be turned on or off.

24. A wind turbine generator set, characterized in that: A wind turbine blade as claimed in any one of claims 1 to 23.

25. A method for manufacturing a wind turbine blade, characterized in that: include: A blade is provided, the blade comprising 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 comprising a first region located between a maximum thickness of the blade and the leading edge, and a second region located between a maximum thickness of the blade and the trailing edge; An elastic sac is provided, which includes an inner cavity, a first sac sheet and a second sac sheet. The inner cavity is arranged between the first sac sheet and the second sac sheet, and the first sac sheet is connected to at least one of the first area and the second area. The second sac sheet is located on the side of the first sac sheet facing away from the pressure surface.

26. The method for manufacturing a wind turbine blade according to claim 25, characterized in that: A strip-shaped bonding portion is provided on the pressure surface; An annular bonding portion is provided along the edge of the elastic bladder; The elastic bladder is fitted to the pressure surface, and the elastic bladder and the pressure surface are connected via the strip-shaped adhesive portion and the annular adhesive portion; applying compressive stress to the elastic bladder; After the strip-shaped bonding portion and the annular bonding portion are cured, the compressive stress applied to the elastic bladder is stopped.

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