Wind power generation blade and device

Abstract

The invention discloses a wind power generation blade and device. The wind power generation blade comprises a shell and a core material part, the core material part is arranged on the inner wall face of the shell, the core material part comprises a first core material piece and a second core material piece, the first core material piece and the second core material piece are sequentially arranged in the length direction of the wind power generation blade, and the end of the first core material piece is connected with the end of the second core material piece; a connecting path is formed at the connecting position of the first core material piece and the second core material piece, at least one first connecting point and at least one second connecting point are arranged on the connecting path, the orthographic projection of the connecting path on the front face of the wind power generation blade and the distance between the first connecting point and the second connecting point are a in the length direction of the wind power generation blade, and a is larger than 0 mm. According to the technical scheme, the stress generated by the bending load can be effectively dispersed, the risk of fracture failure of the connecting area under the action of the long-term alternating load is reduced, the reliability of the blade structure is improved, and the service life of the blade structure is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation, in particular to a wind power generation blade and device. BACKGROUND

[0002] The wind power generation blade is a core component of a wind turbine generator unit, and its function is to convert wind energy into mechanical energy to provide rotating power for a generator.

[0003] In the prior art, the wind power generation blade includes a shell and a core material, wherein the core material is arranged on the inner wall surface of the shell. When the wind power generation blade is running, the shell is deformed under the action of bending, torsion and other loads. As the main load in power generation conditions, the bending load is easy to form stress concentration in the core material connection area when the load is large, which causes the core material connection area to become a weak structure and is prone to fracture failure under long-term alternating loads, affecting the operation reliability of the blade. SUMMARY

[0004] The purpose of the present application is to provide a wind power generation blade and device, which can improve the reliability and service life of the blade structure.

[0005] In a first aspect, the present application provides a wind power generation blade, comprising:

[0006] a shell;

[0007] a core material component arranged on the inner wall surface of the shell, the core material component comprising a first core material piece and a second core material piece, the first core material piece and the second core material piece being arranged in sequence along the length direction of the wind power generation blade, the end of the first core material piece being connected to the end of the second core material piece, and the connection between the first core material piece and the second core material piece forming a connection path;

[0008] The connection path has at least one first connection point and at least one second connection point, and the connection path has a front projection on the front of the wind power generation blade. Along the length direction of the wind power generation blade, the spacing between the first connection point and the second connection point is a, which satisfies a>0mm.

[0009] Beneficial effects: the wind power generation blade, in the manufacturing of the wind power generation blade, installs the core material part in the inner wall surface of the shell, wherein the end of the first core material piece and the second core material piece is connected to form a specific connection path. In the length direction of the front projection of the wind power generation blade, due to the distance a>0mm between the first connection point and the second connection point on the connection path, the connection path is non-linear, and the connection path is not perpendicular to the pitch axis of the wind power generation blade, thereby increasing the contact area of the connection area of the first core material piece and the second core material piece. When the wind power generation blade bears the bending load, the connection of the first core material piece and the second core material piece realizes mutual abutment and action through the increased contact area, which can effectively disperse the stress generated by the bending load, break the coupling state of the load path and the stiffness transition area in the traditional linear butt joint, significantly reduce the stress concentration degree of the connection area, reduce the risk of fracture failure of the connection area under the action of long-term alternating load, and improve the reliability and service life of the blade structure.

[0010] In addition, the connection path at the connection of the first core material piece and the second core material piece can offset the force transmission path and the stiffness transition path of the blade, ensure the stiffness transition of the connection area of the core material part to be more gentle, avoid the stiffness mutation caused by the material switching or thickness change, and improve the mechanical properties and durability of the blade from the structural design level.

[0011] In an optional embodiment, the connection path is an inclined surface.

[0012] Beneficial effects: the connection path is an inclined surface, which breaks the problem that the load path and the stiffness transition area of the core material part coincide in the traditional linear butt joint. When the wind power generation blade bears the bending load, the inclined surface can decompose the load into forces in different directions, avoid stress concentration at the connection interface, make the stress distribution more uniform, and significantly improve the structural stability of the blade under complex working conditions.

[0013] Compared with the linear contact of the linear butt joint, the inclined surface can greatly increase the contact area of the first core material piece and the second core material piece. The larger contact area means that the connection interface can realize more firm combination through resin bonding or other ways, effectively improve the connection strength between the core material parts, and ensure the reliability of the wind power generation blade in long-term operation.

[0014] In addition, the inclined surface changes the crack propagation path, which changes from straight through to oblique and zigzag extension. The crack needs to overcome greater resistance when propagating, thereby delaying the initiation and development speed of the fatigue crack, effectively prolonging the service life of the wind power generation blade under alternating load.

[0015] In an optional embodiment, the inclined surface is an inclined arc surface, and the opening of the inclined arc surface faces the first core material piece and / or the second core material piece.

[0016] Beneficial effects: The inclined arc surface changes the traditional linear butt joint load transmission path, uses the curved shape to guide and diffuse the concentrated stress to the inside of the first core material piece or the second core material piece, makes the stress distribution more uniform, avoids stress concentration in the connection interface, and enhances the structural stability of the wind power blade under bending load.

[0017] Compared with linear butt joint, the arc surface greatly increases the contact area of the first core material piece and the second core material piece. The expanded contact area is combined through resin bonding and other methods, which can effectively improve the connection strength between the core material components and ensure the reliability of the wind power blade in long-term operation.

[0018] When two core material pieces of different materials or thicknesses are connected, the inclined arc surface can realize smooth transition of stiffness, avoid stiffness mutation caused by material switching or thickness change, and make the overall mechanical properties of the wind power blade more stable.

[0019] In an optional embodiment, the inclined surface is an inclined plane.

[0020] Beneficial effects: The inclined plane breaks the stress concentration problem caused by traditional linear butt joint. When the blade bears bending load, the inclined plane can decompose the load into different directions, avoid stress concentration in the connection interface, make the stress distribution more uniform, and thus enhance the stability of the wind power blade structure.

[0021] Compared with linear contact of linear butt joint, the inclined plane can significantly increase the contact area of the first core material piece and the second core material piece. The larger contact area is combined through resin bonding and other methods, which can effectively improve the connection strength between the core material components and reduce the risk of loosening or breaking at the connection part.

[0022] In an optional embodiment, the angle between the inclined plane and the variable pitch axis of the wind power blade is θ, satisfying 10°≤θ≤89°.

[0023] Beneficial effects: The inclined plane and the variable pitch axis maintain an angle of 10° to 89°, ensuring that the inclined plane has a certain inclination angle. When the wind power blade bears bending load, the angle allows the load to be dispersed and transmitted in the inclined direction, decomposed into different directions, avoids excessive stress concentration in the connection interface, makes the stress distribution more uniform, and enhances the blade structure stability.

[0024] Compared with vertical butt joint, the inclination angle of 10° to 89° significantly increases the contact area between the core material pieces, provides a larger action area for resin bonding and other connection processes, makes the connection of the first core material piece and the second core material piece more firm, and reduces the risk of loosening and separation at the connection part.

[0025] In an alternative embodiment, the connecting path comprises a plurality of sequentially connected joint surfaces along the width direction of the wind power blade, and any two adjacent joint surfaces are arranged at an angle.

[0026] Beneficial effects: The connecting path adopts a plurality of sequentially connected joint surfaces arranged at an angle, which can decompose the multi-directional loads such as aerodynamic force and gravity received by the wind power blade during operation into different directional components at the joint surface turning points. This "zigzag" connection breaks the single force transmission mode of the traditional straight line connection, avoids stress concentration in a certain area, makes the stress distribution more uniform, and significantly improves the structural stability of the wind power blade under complex working conditions.

[0027] In an alternative embodiment, any two adjacent joint surfaces are arranged in a V shape.

[0028] Beneficial effects: The adjacent joint surfaces are arranged in a V shape, making the connecting path present a sharp turning zigzag shape. When the wind power blade bears bending, aerodynamic and other loads, the V-shaped structure can forcibly change the transmission direction of the concentrated stress at the turning angle and decompose it into components in multiple directions, more efficiently dispersing the stress than the ordinary zigzag connection, significantly reducing the local stress peak value, and improving the anti-deformation ability of the wind power blade structure.

[0029] Compared with the straight line butt joint, the V-shaped structure extends the length of the connecting path by increasing the turning angle, thereby expanding the contact area of the first core material piece and the second core material piece.

[0030] In an alternative embodiment, at least one vertical surface is provided in the plurality of joint surfaces, and the vertical surface extends along the width direction of the wind power blade.

[0031] Beneficial effects: The combination of the vertical surface and the joint surfaces with other angles can achieve gradient control of the stiffness transition. For example, the vertical surface ensures the stiffness support of the key area, and the adjacent joint surfaces with other angles smoothly transition the stiffness difference of different core materials, avoiding stress concentration that may be caused by a single angle joint.

[0032] In an alternative embodiment, the first core material piece and the second core material piece are made of different materials.

[0033] Beneficial effects: The first core material piece and the second core material piece are made of different materials, which can set different materials according to the actual needs of different parts of the wind power blade, achieving precise optimization of performance.

[0034] In an alternative embodiment, the first core material piece and the second core material piece are made of the same material, the first core material piece is close to the root area of the wind power blade, and the thickness of the first core material piece is different from that of the second core material piece.

[0035] Beneficial effects: Taking the example that the thickness of the first core material piece is greater than the thickness of the second core material piece, when the first core material piece and the second core material piece are of the same material, and the thickness of the first core material piece is greater than the thickness of the second core material piece and close to the blade root area, the wind power blade root as the part connected with the hub needs to bear complex loads such as high bending moment and shear force. The thicker first core material piece can directly enhance the structural stiffness and load-bearing capacity of the blade root area, effectively resist deformation and fracture risk, and ensure the stability of the wind power blade in long-term operation.

[0036] In a second aspect, the present application further provides a wind power generation device, comprising:

[0037] a tower;

[0038] wind power blades, at least two of which are provided, and the wind power blades are rotatably arranged on the tower through a hub.

[0039] Beneficial effects: This wind power generation device has wind power blades. Because the distance a between the first connecting point and the second connecting point on the connecting path is greater than 0 mm, the connecting path is of a non-linear type, and the connecting path is not perpendicular to the variable-pitch axis of the wind power blade, thereby increasing the contact area of the connecting area of the first core material piece and the second core material piece. When the wind power blade bears a bending load, the connecting area of the first core material piece and the second core material piece realizes mutual abutment and action through the increased contact area, which can effectively disperse the stress generated by the bending load, break the coupling state of the load path and the stiffness transition area in the traditional linear butt joint, significantly reduce the stress concentration degree of the connecting area, reduce the risk of fracture failure of the connecting area under the action of long-term alternating load, and improve the reliability and service life of the blade structure. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a structural schematic diagram of a core material component in a wind power blade in an embodiment provided by the present application;

[0042] Figure 2 is a structural schematic diagram of a core material component in a wind power blade in another embodiment provided by the present application;

[0043] Figure 3 is a structural schematic diagram of a core material component in a wind power blade in another embodiment provided by the present application;

[0044] Figure 4 is a structural schematic diagram of a core material part in a wind power generation blade in another embodiment provided by the present application.

[0045] Explanation of reference signs:

[0046] 100, core material part; 110, first core material piece; 120, second core material piece; 130, connecting path; 131, first connecting point; 132, second connecting point; 133, inclined surface; 1331, inclined arc surface; 1332, inclined plane; 134, splicing surface; 1341, vertical surface. DETAILED DESCRIPTION

[0047] In the related art, a wind power generation blade includes a shell and a core material, wherein the core material is arranged on the inner wall surface of the shell. When the wind power generation blade is in operation, the shell is deformed under bending, torsion and other loads, and the bending load is the main load in power generation conditions. When the load is large, stress concentration is easily formed at the core material connection area, which causes the core material connection area to become a structural weak point and is prone to fracture failure under long-term alternating loads, thereby affecting the operation reliability of the blade.

[0048] In the development process of the present application, the butt joint of the core material of the wind power generation blade generally uses linear connection, and the butt joint path is perpendicular to the direction of maximum stress. When the core material is switched (such as from foam to balsa wood) or the thickness changes, the stiffness transition is severe, and stress concentration is easily formed at the butt joint, which is prone to fracture failure under long-term alternating loads.

[0049] To solve this problem, the team initially tried to locally add glass fiber reinforced plastic composite materials for reinforcement at the core material butt joint. However, the reinforcement can only alleviate the surface stress and cannot fundamentally change the mechanical nature of stress concentration, making it difficult to deal with complex stress changes caused by core material stiffness transition. At the same time, the additional reinforcement step not only increases the complexity of the production process and prolongs the manufacturing cycle, but also introduces new process risks, such as poor bonding of the reinforcement material and the core material, insufficient compatibility of the reinforcement area and the overall structure, and other problems, resulting in rising manufacturing costs and reduced yield of the blade.

[0050] Based on this, the present application re-designs the wind power generation blade. In the manufacturing of the wind power generation blade, the core material part is installed on the inner wall surface of the shell, wherein the end of the first core material piece and the end of the second core material piece are connected to form a specific connection path. In the front projection of the wind power generation blade along the length direction, due to the distance a>0mm between the first connection point and the second connection point on the connection path, the connection path is non-linear, and the connection path is not perpendicular to the pitch axis of the wind power generation blade, thereby increasing the contact area of the connection area of the first core material piece and the second core material piece. When the wind power generation blade bears the bending load, the connection of the first core material piece and the second core material piece realizes mutual abutment and action through the increased contact area, which can effectively disperse the stress generated by the bending load, break the coupling state of the load path and the stiffness transition area in the traditional linear butt joint, significantly reduce the stress concentration degree of the connection area, reduce the risk of fracture failure of the connection area under the action of long-term alternating load, and improve the reliability and service life of the blade structure.

[0051] In addition, the connection path at the connection of the first core material piece and the second core material piece can make the blade force transmission path and the stiffness transition path staggered, ensure that the stiffness transition of the connection area of the core material part is more gentle, avoid the stiffness mutation caused by material switching or thickness change, and improve the mechanical properties and durability of the blade from the aspect of structural design.

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0053] The embodiments of the present application will be described below in combination with Figures 1 to 4 .

[0054] According to the embodiments of the present application, on the one hand, as shown in Figures 1 to 4 , a wind power generation blade is provided, comprising a shell and a core material part 100.

[0055] Specifically, as shown in Figures 1 to 4 , the core material part 100 is arranged on the inner wall surface of the shell (not shown in the figure), wherein the core material part 100 comprises a first core material piece 110 and a second core material piece 120. Along the length direction of the wind power generation blade, the first core material piece 110 and the second core material piece 120 are arranged in sequence, the end of the first core material piece 110 is connected with the end of the second core material piece 120, and the connection of the first core material piece 110 and the second core material piece 120 forms a connection path 130.

[0056] Specifically, as shown in Figures 1 to 4As shown, the connection path 130 has a first connection point 131 and a second connection point 132, and each of the first connection point 131 and the second connection point 132 is provided with at least one. In the front projection of the wind power blade, along the length direction of the wind power blade, the distance between the first connection point 131 and the second connection point 132 on the connection path 130 is a, and a>0mm is satisfied.

[0057] In the manufacturing of the wind power blade, the core material part 100 is installed on the inner wall surface of the shell, and the end portions of the first core material piece 110 and the second core material piece 120 are connected to form a specific connection path 130. In the front projection of the wind power blade along the length direction, due to the distance a>0mm between the first connection point 131 and the second connection point 132 on the connection path 130, the connection path 130 is in a non-linear shape, and the connection path 130 is not perpendicular to the pitch axis of the wind power blade, thereby increasing the contact area of the connection region of the first core material piece 110 and the second core material piece 120. When the wind power blade bears a bending load, the connection region of the first core material piece 110 and the second core material piece 120 realizes mutual abutment and action through the increased contact area, which can effectively disperse the stress generated by the bending load, break the coupling state of the load path and the stiffness transition region in the traditional linear butt joint, significantly reduce the stress concentration degree of the connection region, reduce the risk of fracture failure of the connection region under the action of long-term alternating load, and improve the reliability and service life of the blade structure.

[0058] In addition, the connection path 130 at the connection region of the first core material piece 110 and the second core material piece 120 can make the blade force transmission path and the stiffness transition path staggered, ensure that the stiffness transition of the connection region of the core material part 100 is more gentle, avoid the stiffness mutation caused by the material switching or thickness change, and improve the mechanical properties and durability of the blade from the structural design level.

[0059] Specifically, the core material part 100 can be selected from PET (polyethylene terephthalate) foam, PVC (polyvinyl chloride) foam, or light wood, and in the embodiments of the present application, the material of the core material part 100 is not specifically limited.

[0060] Specifically, the first connection point 131 and the second connection point 132 are two coordinate points on the connection path 130, which are used to define the shape of the connection path 130. If the projection of the connection path 130 is a diagonal line, the two points can be regarded as the two end points of the diagonal line. If the projection of the connection path 130 is an arc line, the two points can be regarded as the starting point and the ending point (or the feature point) on the arc line.

[0061] Specifically, the projection of the connection path 130 can be a diagonal line, an arc line, a zigzag shape, or other non-linear shapes, and the connection path 130 can also be irregular. In the embodiments of the present application, the shape of the connection path 130 is not specifically limited.

[0062] In one embodiment, as shown in Figure 1 and Figure 2 The connecting path 130 is in the form of an inclined surface 133.

[0063] The connecting path 130 is in the form of an inclined surface 133, which breaks the problem of the coincidence of the load path and the stiffness transition area of the core material part 100 in the traditional linear butt joint. When the wind power blade bears a bending load, the inclined surface 133 can decompose the load into forces in different directions, avoid stress concentration at the connecting interface, make the stress distribution more uniform, and significantly improve the structural stability of the blade under complex working conditions.

[0064] Compared with the linear contact of the linear butt joint, the inclined surface 133 can greatly increase the contact area of the first core material part 110 and the second core material part 120. A larger contact area means that the connecting interface can achieve a more firm combination through resin bonding or other means, effectively improving the connection strength between the core material parts 100 and ensuring the reliability of the wind power blade in long-term operation.

[0065] In addition, the inclined surface 133 changes the path of crack propagation, making it extend in a diagonal and tortuous manner instead of straight through. The crack needs to overcome greater resistance when propagating, thereby delaying the initiation and development speed of fatigue cracks, effectively prolonging the service life of the wind power blade under alternating loads.

[0066] At the same time, the structure of the inclined surface 133 can be realized through a standard planar cutting process, which has low manufacturing difficulty, small assembly error, and is easier to realize modular production. Not only simplifies the blade manufacturing process, but also reduces the mold development and production assembly cost, and improves the production efficiency.

[0067] Specifically, the connecting path 130 can be partially in the form of an inclined surface 133 or entirely in the form of an inclined surface 133, and in the embodiments of the present application, the shape of the connecting path 130 is not specifically limited.

[0068] In one embodiment, as shown in Figure 1 The inclined surface 133 is in the form of an inclined arc surface 1331, wherein the opening of the inclined arc surface 1331 faces the first core material part 110 and / or the second core material part 120.

[0069] The inclined arc surface 1331 changes the load transmission path of the traditional linear butt joint, uses the curved shape to guide and diffuse the concentrated stress to the inside of the first core material part 110 or the second core material part 120, makes the stress distribution more uniform, avoids stress concentration at the connecting interface, and enhances the structural stability of the wind power blade under bending load.

[0070] Compared with linear butt joint, the arc-shaped surface greatly increases the contact area of the first core material piece 110 and the second core material piece 120, and the enlarged contact area is combined through resin bonding or the like, which can effectively improve the connection strength between the core material components 100 and ensure the reliability of the long-term operation of the wind power blade.

[0071] When core material pieces of two different materials or thicknesses are connected, the inclined arc-shaped surface 1331 can realize smooth transition of the stiffness, avoid stiffness mutation caused by material switching or thickness change, and make the overall mechanical properties of the wind power blade more stable.

[0072] Specifically, by adjusting the opening direction of the inclined arc-shaped surface 1331, whether the core material piece is high-stiffness or low-stiffness, the stiffness transition direction can be targeted optimized, so as to ensure that the core material of different materials can play the best performance when connected, and improve the overall adaptability of the wind power blade.

[0073] Specifically, the opening of the inclined arc-shaped surface 1331 can be provided with one or more, and the opening can be directed to the first core material piece 110 or the second core material piece 120. Alternatively, one opening is directed to the first core material piece 110, and one opening is directed to the second core material piece 120, that is, the inclined arc-shaped surface 1331 is similar to S-shaped. In the embodiments of the present application, the shape of the inclined arc-shaped surface 1331 is not specifically limited.

[0074] In one embodiment, as shown in Figure 2 the inclined surface 133 is an inclined plane 1332.

[0075] The inclined plane 1332 breaks the stress concentration problem caused by traditional linear butt joint. When the blade bears bending load, the inclined plane 1332 can decompose the load into forces in different directions, avoid stress concentration at the connection interface, make the stress distribution more uniform, and thus enhance the stability of the wind power blade structure.

[0076] Compared with linear contact of linear butt joint, the inclined plane 1332 can significantly increase the contact area of the first core material piece 110 and the second core material piece 120, and the larger contact area is combined through resin bonding or the like, which can effectively improve the connection strength between the core material components 100 and reduce the risk of loosening or breaking at the connection part.

[0077] Specifically, the inclined plane 1332 is designed in the manufacturing process, and does not need complex molds or processes, and can be realized through conventional cutting and processing, which is easy to standardize production, reduces the production difficulty and manufacturing cost, and is also convenient for installation and maintenance.

[0078] In one embodiment, as shown in Figure 2 the angle between the inclined plane 1332 and the pitch axis of the wind power blade is θ, and satisfies 10°≤θ≤89°.

[0079] The inclined plane 1332 maintains an angle of 10° to 89° with the pitch axis, ensuring that the inclined plane 1332 has a certain inclination angle. When the wind power blade bears a bending load, the angle enables the load to be transmitted in the inclined direction, decomposed into forces in different directions, avoids excessive stress concentration on the connection interface, makes the stress distribution more uniform, and enhances the stability of the blade structure.

[0080] Compared with vertical butt joint, the inclined angle of 10° to 89° significantly increases the contact area between the core material pieces, provides a larger action area for connection processes such as resin bonding, makes the connection of the first core material piece 110 and the second core material piece 120 more firm, and reduces the risk of loosening or disconnection at the connection site.

[0081] Specifically, if the θ angle is too small, the inclined plane 1332 approaches parallel to the pitch axis, at which time the tangential component of the load along the inclined plane 133 is too high, which easily causes shear slip of the connection interface of the core material part 100.

[0082] Specifically, if the θ angle approaches 90°, the inclined plane 1332 approaches vertical butt joint, and the load transmission path coincides with the core material stiffness transition region, again forming stress concentration.

[0083] In one embodiment, as shown in Figure 3 and Figure 4 , along the width direction of the wind power blade, the connection path 130 includes a plurality of splicing surfaces 134 connected in sequence, wherein any two adjacent splicing surfaces 134 are arranged at an angle.

[0084] The connection path 130 adopts a plurality of splicing surfaces 134 connected in sequence and arranged at an angle, which can decompose the multi-directional loads such as aerodynamic force and gravity received by the wind power blade during operation into forces in different directions at the turning points of the splicing surfaces 134. This “zigzag” connection breaks the single transmission mode of the traditional straight connection, avoids stress concentration in a certain area, makes the stress distribution more uniform, and significantly improves the structural stability of the wind power blade under complex working conditions.

[0085] The non-linear connection path 130 formed by the plurality of splicing surfaces 134 changes the propagation trajectory of the fatigue crack. When the crack is generated, it needs to change direction constantly at the turning points of the splicing surfaces 134, greatly increasing the resistance of crack propagation and effectively delaying the development speed of the crack. Compared with the traditional straight connection, the fatigue life and overall service life of the wind power blade are greatly prolonged.

[0086] In one embodiment, as shown in Figure 3 , any two adjacent splicing surfaces 134 are arranged in a V shape.

[0087] The adjacent splicing surface 134 is arranged in a V shape, so that the connection path 130 presents a sharp turning broken line form. When the wind power blade bears bending, aerodynamic and other loads, the V-shaped structure can forcibly change the transmission direction of the concentrated stress at the corner, decompose it into multiple directional components, more efficiently disperse the stress than the ordinary broken line connection, significantly reduce the local stress peak, and improve the anti-deformation ability of the wind power blade structure.

[0088] Compared with the straight-line butt joint, the V-shaped structure extends the length of the connection path 130 by increasing the corner, thereby expanding the contact area of the first core material piece 110 and the second core material piece 120.

[0089] Specifically, the V-shaped splicing surface 134 can be realized by a standardized mold and cutting process, without complex curved surface processing, thereby reducing the production difficulty and cost. At the same time, the V-shaped interface has clear positioning and guiding properties during assembly, facilitating quick and accurate butt joint, improving production efficiency, and reducing manual errors.

[0090] In one embodiment, as shown in FIG. 1, at least one vertical surface 1341 is provided in the plurality of splicing surfaces 134, and the vertical surface 1341 extends along the width direction of the wind power blade. Figure 4

[0091] The vertical surface 1341 and the splicing surface 134 with other angles are combined to realize gradient control of the stiffness transition. For example, the vertical surface 1341 ensures the stiffness support of the key area, and the adjacent splicing surface 134 with other angles smoothly transitions the stiffness difference of different core materials, avoiding stress concentration that may be caused by single-angle splicing.

[0092] In one embodiment, as shown in FIG. 1, the first core material piece 110 and the second core material piece 120 are made of different materials. Figure 1

[0093] The first core material piece 110 and the second core material piece 120 are made of different materials, which can set different materials according to the actual needs of different parts of the wind power blade, to realize precise optimization of performance.

[0094] For example, in the root area bearing high load, a core material piece with high strength and high rigidity can be selected to ensure the structural strength; and in the tip area sensitive to weight, a lightweight core material is used to reduce the moment of inertia and improve the aerodynamic efficiency. Through such a setting mode, the overuse of high-performance materials can be avoided to control the cost, and the complementary characteristics of the materials, such as the combination of rigid materials and damping materials, can effectively suppress the vibration of the wind power blade and reduce fatigue damage, so that the wind power blade can perform best in different working conditions.

[0095] For example, the first core material piece 110 can use balsa wood, and the second core material piece 120 can use PET (polyethylene terephthalate) foam.​​

[0096] In one embodiment, as shown in FIG. 1, the first core material piece 110 and the second core material piece 120 are made of the same material, and the first core material piece 110 is close to the root region of the wind power blade, and the thickness of the first core material piece 110 is different from the thickness of the second core material piece 120. Figure 1

[0097] For example, when the thickness of the first core material piece 110 is greater than the thickness of the second core material piece 120, and the first core material piece 110 and the second core material piece 120 are made of the same material, and the thickness of the first core material piece 110 is greater than the thickness of the second core material piece 120 and close to the root region, the root of the wind power blade as a part connected with the hub needs to bear complex loads such as high bending moment and shear force. The thicker first core material piece 110 can directly enhance the structural rigidity and carrying capacity of the root region, effectively resist the risk of deformation and fracture, and ensure the stability of the wind power blade in long-term operation.

[0098] From the root to the tip of the wind power blade, the load borne by the wind power blade gradually decreases. Through the design of the core material with gradually changing thickness, the structural rigidity of the wind power blade is smoothly transitioned along the length direction, avoiding stress concentration caused by sudden change of rigidity.

[0099] For example, the first core material piece 110 and the second core material piece 120 can both use balsa wood or PET (polyethylene terephthalate) foam.

[0100] According to an embodiment of the present application, on the other hand, as shown in FIG. 2, a wind power device is also provided, which includes a tower (not shown in the figure) and wind power blades. Figures 1 to 4 Specifically, at least two wind power blades are provided, and the wind power blades are rotatably installed on the tower through a hub.

[0101] The wind power device has wind power blades. Due to the distance a>0mm between the first connection point 131 and the second connection point 132 on the connection path 130, the connection path 130 is in a non-linear shape, and the connection path 130 is not perpendicular to the pitch axis of the wind power blade, thereby increasing the contact area of the connection region of the first core material piece 110 and the second core material piece 120. When the wind power blade bears a bending load, the connection between the first core material piece 110 and the second core material piece 120 realizes mutual abutment and action through the increased contact area, which can effectively disperse the stress generated by the bending load, break the coupling state of the load path and the rigidity transition region in the traditional linear butt joint, significantly reduce the stress concentration degree of the connection region, reduce the risk of fracture failure of the connection region under the action of long-term alternating load, and improve the reliability and service life of the blade structure.

[0102]

[0103] ​​Specifically, the wind power generation blades on the wind power generation device can be two, three, etc., and the number of the wind power generation blades is not specifically limited in the embodiments of the present application.

[0104] Wherein, the terms of "upper", "lower" and the like are used to describe the relative positional relationship of various structures in the drawings, which is only for the convenience of clear description, and is not used to limit the scope of the present application, and the change or adjustment of the relative relationship is also regarded as the scope of the present application without substantial change of the technical content.

[0105] It should be noted that: in the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0106] In addition, in the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0107] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0108] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wind power generating blade, characterized in that, The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower.

2. A wind power generating blade according to claim 1, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

3. A wind power generating blade according to claim 2, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

4. A wind power generating blade according to claim 2, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

5. A wind power generating blade according to claim 4, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

6. A wind power generating blade according to claim 1, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

7. A wind power generating blade according to claim 6, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

8. A wind power generating blade according to claim 6, characterised in that The application relates to a wind power generation blade and a wind power generation tower.

9. A wind power generating blade according to any of claims 1 to 8, characterised in that, The application relates to a wind power generation blade and a wind power generation tower.

10. A wind power generating blade according to any of claims 1 to 8, characterised in that, The application relates to a wind power generation blade and a wind power generation tower.

11. A wind power plant, characterized in that The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. The application relates to a wind power generation blade and a wind power generation tower. 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