Wind power blade

Abstract

The invention relates to a wind power blade. The wind power blade comprises more than two blade modules, a reinforcing piece and a bonding body. The blade modules are spliced in the length direction of the wind power blade, each blade module comprises a bearing beam and a covering layer, each bearing beam comprises a butt-joint inclined face and a butt-joint end face which are connected, the covering layers cover the butt-joint inclined faces and the butt-joint end faces, the rigidity of the covering layers is smaller than that of the bearing beams, any two adjacent blade modules are in butt joint, and the butt-joint inclined faces are in lap joint with each other. The reinforcing piece covers a gap formed by butt joint of the two adjacent bearing beams, the reinforcing piece is connected with the two adjacent bearing beams, and the rigidity of the reinforcing piece is smaller than that of the bearing beams; the covering layers corresponding to the butt-joint inclined faces of the two bearing beams are bonded through bonding bodies, and the reinforcing pieces and the covering layers are bonded through bonding bodies. According to the wind power blade provided by the invention, the possibility of cracking failure caused by stress concentration between the two bearing beams is reduced, and the service life of the wind power blade is prolonged.

Description

Technical Field

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

[0002] As wind turbine blades become longer and longer, the cost and difficulty of their transportation increase significantly. In order to reduce the difficulty of transportation and significantly save transportation costs, segmented blades are the main development trend in the future. The main purpose of connecting segmented blades is to ensure that the load-bearing beams such as the main beam, auxiliary beam or trailing edge beam are continuously and effectively transmitted. Generally, segmented blades are connected by bonding, pinning, bolting and other connection methods.

[0003] See also Figure 1 As shown, the prior art discloses a segmented blade, which includes a first blade segment and a second blade segment. The first blade segment and the second blade segment are spliced ​​along the length direction of the blade. The first blade segment includes a first beam segment. The first beam segment is provided with a first butt-jointed bevel 1A and a first butt-jointed end face 1B. The second blade segment includes a second beam segment. The second beam segment is provided with a second butt-jointed bevel 1C and a second butt-jointed end face 1D. When the first blade segment and the second blade segment are butt-jointed, the first butt-jointed bevel 1A and the second butt-jointed bevel 1C are overlapped and bonded.

[0004] However, see Figure 2 As shown, the above-mentioned segmented blade has great stress concentration at the first butt end surface and the second butt end surface, which easily leads to fatigue fracture at the connection between the first blade segment and the second blade segment, thereby affecting the service life of the segmented blade. Summary of the invention

[0005] The present application provides a wind turbine blade, which is beneficial to reducing the possibility of cracking failure due to stress concentration between two load-bearing beams and increasing the service life of the wind turbine blade.

[0006] An embodiment of the present application provides a wind turbine blade, which includes more than two blade modules, a reinforcement member and an adhesive body.

[0007] Each blade module is spliced ​​along the length direction of the wind turbine blade. The blade module includes a bearing beam and a covering layer. The bearing beam includes a connected butt joint bevel and butt joint end face. The covering layer covers the butt joint bevel and butt joint end face. The rigidity of the covering layer is less than the rigidity of the bearing beam. Any two adjacent blade modules are butt jointed, and the butt joint bevels overlap each other.

[0008] The reinforcement member covers the gap formed by the butt joint of two adjacent load-bearing beams, and the reinforcement member connects the two adjacent load-bearing beams, and the stiffness of the reinforcement member is less than the stiffness of the load-bearing beams;

[0009] The covering layers corresponding to the butting inclined surfaces of the two load-bearing beams and the reinforcing member and the covering layers are bonded together by the bonding body.

[0010] In the wind turbine blade of the embodiment of the present application, a covering layer is provided on the butt joint of the bearing beam. The covering layer covers the butt bevel and butt end face on the butt joint. The stiffness of the covering layer is less than that of the bearing beam. The stiffness of the reinforcement is less than that of the bearing beam. The covering layer can change the force conduction path. Therefore, the force conduction path between the two bearing beams includes bearing beam-covering layer-adhesive body-reinforcement body-adhesive body-covering layer-bearing beam, which can be helpful to disperse the force, reduce the stress concentration at the top corner of the bearing beam, reduce the possibility of cracking failure between the butt end face and the adhesive body due to stress concentration, and increase the service life of the wind turbine blade.

[0011] In some possible implementations, the covering layer includes a plurality of layers, and the plurality of layers are stacked along a thickness direction of the covering layer.

[0012] The connection strength and the load-bearing capacity of the covering layer comprising a plurality of layers can be improved.

[0013] In some achievable embodiments, the edges of each layer corresponding to the butt end surface are staggered, each layer has a protruding portion that protrudes beyond the butt end surface along the length direction, and each protruding portion has a different length.

[0014] The edges of each layer corresponding to the butt end faces are staggered to reduce the possibility of stress concentration in the edge area of ​​the covering layer, which is beneficial to improving the bearing capacity of the covering layer.

[0015] In some achievable embodiments, the covering layer is a single-layer structure, each covering layer is staggered at an edge corresponding to the butt end face, and the covering layer has an overhanging portion that exceeds the butt end face along a length direction, and each overhanging portion has a different length.

[0016] The staggered arrangement of the edges corresponding to the respective covering layers and the butt end faces is beneficial to reducing the possibility of stress concentration in the edge regions of the covering layers and is beneficial to improving the bearing capacity of the covering layers.

[0017] In some achievable manners, in two adjacent blade modules, the protruding portion in one blade module overlaps the covering layer of the other blade module, and the protruding portion covers a gap formed by the butt connection of two adjacent load-bearing beams.

[0018] The protruding portion of the covering layer can be used in conjunction with the reinforcement to connect the two bearing beams, thereby facilitating the improvement of the connection strength and bearing capacity of the two bearing beams. At the same time, the force transmission path between the two bearing beams can also include bearing beam-covering layer-adhesive body-covering layer-bearing beam, which is conducive to increasing the force transmission path mode, dispersing the force, and reducing the possibility of stress concentration in the bearing beam.

[0019] In some achievable manners, the reinforcement member covers the protruding portion, and the reinforcement member can protect the protruding portion.

[0020] In some achievable embodiments, the length of the protruding portion close to the reinforcement is greater than the length of the protruding portion far from the reinforcement.

[0021] In the length direction of the wind turbine blade, the stiffness of the cover layer at the position of the exceeding portion may be gradually reduced, that is, the change is slow rather than sudden, which is helpful to further reduce the possibility of stress concentration at the edge of the cover layer.

[0022] In some possible implementations, the cover layer exceeds the reinforcement member along the length direction.

[0023] In the butted load-bearing beam, the reinforcement has covering layers on both sides along the length direction, which is conducive to ensuring that a connection area is formed between the reinforcement as a whole and the covering layer, and improving the connection strength and bearing capacity between the covering layer and the reinforcement.

[0024] In some achievable embodiments, the elastic modulus of the cover layer is greater than or equal to 8 GPa and less than or equal to 20 GPa.

[0025] In some achievable embodiments, the covering layer includes first fibers and second fibers, the first fibers extend along a first direction, the second fibers extend along a second direction, the angle between the first direction and the length direction is 30° to 60°, and the angle between the second direction and the length direction is 30° to 60°.

[0026] In some possible implementations, the material of the adhesive body includes thermosetting adhesive or thermoplastic resin.

[0027] In some embodiments, the reinforcement includes fiberglass fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0029] Figure 1 It is a schematic diagram of the local structure of a wind turbine blade in the related art;

[0030] Figure 2 for Figure 1 The schematic diagram of stress distribution at the butt end surface of the segmented blade is shown;

[0031] Figure 3 A schematic diagram of the structure of a wind turbine generator set provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of the structure of a wind turbine blade provided in some embodiments of the present application;

[0033] Figure 5 A schematic diagram of a partial cross-sectional structure of a wind turbine blade provided in some embodiments of the present application;

[0034] Figure 6 A schematic diagram of a partial structure of a wind turbine blade in the related art;

[0035] Figure 7 A schematic diagram of a partial structure of a blade module provided in some embodiments of the present application;

[0036] Figure 8 A schematic diagram of a partial structure of a wind turbine blade provided in some embodiments of the present application;

[0037] Fig. 9 A schematic diagram of a partial structure of a wind turbine blade provided in some embodiments of the present application;

[0038] Fig.10 A schematic diagram of a partial structure of a blade module provided in some embodiments of the present application;

[0039] Fig.11 A schematic diagram of the local structure of a covering layer provided in some embodiments of the present application.

[0040] In the drawings, the drawings are not necessarily drawn to scale.

[0041] Description of reference numerals:

[0042] 10. Wind turbine generator set;

[0043] 20. Wind turbine blades;

[0044] 30. Shell;

[0045] 40. load-bearing beam; 41. butt-jointing inclined surface; 42. butt-jointing end surface;

[0046] 50. Blade module;

[0047] 60. Reinforcement;

[0048] 70. Adhesive body;

[0049] 80, covering layer; 801, protruding portion; 802, first fiber; 803, second fiber; 81, layer body;

[0050] X, length direction;

[0051] Y1, first direction;

[0052] Y2, second direction. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; 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" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0055] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "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 a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0058] The term "plurality" used in the present application refers to two or more (including two).

[0059] Figure 3 The structure of the wind turbine generator set 10 is schematically shown. Figure 3As shown, an embodiment of the present application provides a wind turbine generator set 10. The wind turbine generator set 10 includes a tower, a nacelle and a wind rotor. The nacelle is arranged at the top of the tower. The wind rotor includes a hub and a wind turbine blade 20. The wind turbine blade 20 is connected to the hub. The hub is connected to the main shaft of the nacelle. The wind turbine blade 20 can generate torque under the action of wind. The wind turbine blade 20 and the hub drive the main shaft of the nacelle to rotate, so that wind energy can be converted into mechanical energy. The main shaft of the nacelle can be connected to the rotor of the generator, so that mechanical energy can be converted into electrical energy.

[0060] Figure 4 The structure of a wind turbine blade 20 is schematically shown. Figure 5 The partial cross-sectional structure of the wind turbine blade 20 is schematically shown. Figure 4 and Figure 5 As shown, the embodiment of the present application provides a wind turbine blade 20. The wind turbine blade 20 includes a load-bearing beam 40 and a shell 30. The load-bearing beam 40 may be connected to the shell 30.

[0061] In the related technology, Figure 6 The partial structure of a related art wind turbine blade 20 is schematically shown. Figure 6 As shown, two load-bearing beams 40 are directly bonded by an adhesive 70 to achieve docking. There is stress concentration at the two vertex corners D1 and D2 of the docking end face 42 of the load-bearing beam 40, and there is a possibility that cracks will easily occur at the vertex corners D1 and D2 during the subsequent use of the wind turbine blade 20. One way is to use a reinforcement 60 alone to connect the two load-bearing beams 40 to help reduce the stress concentration at the vertex corner D1. However, the inventor further discovered that due to the large stiffness of the two load-bearing beams 40, the force between the two directly bonded load-bearing beams 40 has a conduction path of load-bearing beam 40-adhesive 70-load-bearing beam 40, which leads to a large stress concentration at the vertex corner D2.

[0062] Figure 7 A partial structure of the blade module 50 is schematically shown. Figure 8 The partial structure of the wind turbine blade 20 is schematically shown. Figure 2 , Figure 7 and Figure 8 As shown, an embodiment of the present application provides a wind turbine blade 20 , which includes more than two blade modules 50 , a reinforcement member 60 and an adhesive body 70 .

[0063] Each blade module 50 is spliced ​​along the length direction X of the wind turbine blade 20. The blade module 50 includes a load-bearing beam 40 and a covering layer 80. The load-bearing beam 40 includes a connected butt bevel 41 and a butt end face 42. The covering layer 80 covers the butt bevel 41 and the butt end face 42. The rigidity of the covering layer 80 is less than the rigidity of the load-bearing beam 40. Any two adjacent blade modules 50 are butt-jointed, and the butt bevels 41 overlap each other. The reinforcement 60 covers the gap formed by the butt joint of two adjacent load-bearing beams 40, and the reinforcement 60 connects two adjacent load-bearing beams 40. The rigidity of the reinforcement 60 is less than the rigidity of the load-bearing beam 40. The covering layers 80 corresponding to the butt bevels 41 of the two load-bearing beams 40 and the reinforcement 60 and the covering layer 80 are bonded by an adhesive 70.

[0064] In the embodiment of the present application, each blade module 50 can be processed and manufactured separately. It is transported to the construction site by transportation equipment. Then, each blade module 50 is docked with each other to finally form a complete wind turbine blade 20. Therefore, for a wind turbine blade 20 with a length of more than 100 meters, such a processing method is conducive to reducing the difficulty and cost of transportation.

[0065] After the load beam 40 is formed, a butt joint bevel 41 is cut at one end by machining, and a butt joint end face 42 is formed in the uncut and thickened area. When two blade modules 50 are butted, the load beams 40 of the two blade modules 50 can butt joint each other at the butt joint bevel 41, and the two load beams 40 are connected by the reinforcement 60 and the adhesive 70.

[0066] In the embodiment of the present application, the load-bearing beam 40 may be a main beam, a secondary beam or a trailing edge beam. The load-bearing beam 40 may be formed by a pultruded plate or an infused laminate, etc. In the fabric constituting the corresponding load-bearing beam 40, the unidirectional fibers extending along the length direction X account for more than 70%. The fibers in the load-bearing beam 40 may include carbon fibers.

[0067] In the embodiment of the present application, the rigidity of the covering layer 80 is less than the rigidity of the load-bearing beam 40, so that the covering layer 80 is easy to deform relative to the load-bearing beam 40. Therefore, a load-bearing beam 40 can be connected and transitioned through the covering layer 80 with relatively small rigidity. Exemplarily, the covering layer 80 and the load-bearing beam 40 can be bonded and fixed with an adhesive. Exemplarily, the covering layer 80 can be a fabric. For example, the covering layer 80 can include glass fiber. Exemplarily, after the load-bearing beam 40 is machined, the covering layer 80 can be laid on the end of the load-bearing beam 40, the covering layer 80 covers the butt bevel 41 and the butt end face 42, and the covering layer 80 is fixedly connected to the load-bearing beam 40.

[0068] In the embodiment of the present application, the adhesive 70 can fill the gap formed by the butt joint of two adjacent load beams 40. The adhesive 70 can bond the two load beams 40 with the cover layer 80 and the reinforcement 60 to form an integral structure to achieve butt joint connection of the two load beams 40. Exemplarily, the material of the adhesive 70 includes thermosetting adhesive or thermoplastic resin.

[0069] In the wind turbine blade 20 of the embodiment of the present application, a covering layer 80 is provided on the butt joint of the load-bearing beam 40. The covering layer 80 covers the butt bevel 41 and the butt end face 42 on the butt joint. The stiffness of the covering layer 80 is less than that of the load-bearing beam 40. The stiffness of the reinforcement 60 is less than that of the load-bearing beam 40. The covering layer 80 can change the force conduction path. Therefore, the force conduction path between the two load-bearing beams 40 may include the load-bearing beam 40-covering layer 80-adhesive body 70-reinforcement member 60-adhesive body 70-covering layer 80-load-bearing beam 40, which can be beneficial to disperse the force, reduce the stress concentration at the top angle D2 of the load-bearing beam 40, reduce the possibility of cracking failure between the butt end face 42 and the adhesive body 70 due to stress concentration, and improve the service life of the wind turbine blade 20.

[0070] In some possible implementations, see Figure 7 As shown, the butt end face 42 is also called a thick surface. The slope of the butt end face 42 is greater than the slope of the corresponding overlapping inclined surface. The thickness H of the butt end face 42 is greater than or equal to 0.1 millimeters (mm) and less than or equal to 0.6 millimeters. For example, the thickness H of the butt end face 42 is greater than or equal to 0.2 millimeters and less than or equal to 0.4 millimeters.

[0071] In some achievable ways, Fig. 9 The partial structure of the wind turbine blade 20 is schematically shown. Fig. 9 As shown, the covering layer 80 may be a single-layer structure, that is, the covering layer 80 includes a layer body 81. Each covering layer 80 is staggered at the edge corresponding to the butt end face 42. The covering layer 80 has a protruding portion 801 that protrudes beyond the butt end face 42 along the length direction X. The lengths of each protruding portion 801 are different.

[0072] The staggered arrangement of the edges of each covering layer 80 corresponding to the butt end surface 42 is beneficial to reducing the possibility of stress concentration in the edge area of ​​the covering layer 80 and improving the bearing capacity of the covering layer 80 .

[0073] Of the two protruding portions 801 of the cover layer 80 at the butt end surface 42, the length of the protruding portion 801 close to the reinforcement 60 is greater than the length of the protruding portion 801 away from the reinforcement 60. In the length direction X of the wind turbine blade 20, the stiffness of the cover layer 80 at the protruding portion 801 can be gradually reduced, that is, the change is slow rather than sudden, which is conducive to further reducing the possibility of stress concentration at the edge of the cover layer 80.

[0074] In some examples, from Fig. 9 In the up and down directions shown in , the lengths of the protruding portion 801 are 80 mm and 110 mm respectively.

[0075] In some examples, the cover layer 80 may be a single-layer structure and may have a thickness of 0.5 mm to 0.9 mm.

[0076] In some achievable ways, Fig.10 The partial structure of the blade module 50 is schematically shown. Fig.10 As shown, the cover layer 80 may include a plurality of layers 81. The plurality of layers 81 are stacked along the thickness direction of the cover layer 80. The connection strength and the bearing capacity of the cover layer 80 including the plurality of layers 81 are improved.

[0077] A plurality of layers 81 are sequentially laid on the load beam 40 to form a cover layer 80. In some examples, the plurality of layers 81 may be fixedly connected to the load beam 40 using an adhesive. In some examples, each layer 81 may be a fabric layer. Each layer 81 may include glass fiber. The thickness of each layer 81 may be the same.

[0078] In some examples, the thickness of layer 81 may be between 0.43 mm and 0.55 mm.

[0079] In some examples, the edges of each layer 81 corresponding to the butt end face 42 are staggered to reduce the possibility of stress concentration in the edge area of ​​the cover layer 80, which is beneficial to improve the bearing capacity of the cover layer 80. Each layer 81 has a protruding portion 801 that protrudes beyond the butt end face 42 along the length direction X. The lengths of each protruding portion 801 are different.

[0080] For example, in any two adjacent layers 81, the length of the protruding portion 801 close to the reinforcement 60 is greater than the length of the protruding portion 801 away from the reinforcement 60. In the length direction X of the wind turbine blade 20, the stiffness of the cover layer 80 at the position of the protruding portion 801 can be gradually reduced, that is, the change is slow rather than sudden, which is conducive to further reducing the possibility of stress concentration at the edge of the cover layer 80.

[0081] For example, the covering layer 80 includes two layers 81. Four layers 81 are stacked on top of each other at positions corresponding to the butting end surface 42. The lengths of the overhanging portions 801 of the four layers 81 are different. Fig.10 In the up-down direction shown in FIG, the length of the protruding portion 801 increases successively, that is, the closer to the reinforcing member 60, the longer the length of the protruding portion 801. Fig.10 In the up and down directions shown in , the lengths of the protruding portion 801 are 30 mm, 60 mm, 90 mm, and 120 mm, respectively.

[0082] In some possible implementations, see Fig. 9 As shown, in two adjacent blade modules 50, the protruding portion 801 in one blade module 50 overlaps the covering layer 80 of the other blade module 50. The protruding portion 801 covers the gap formed by the butt joint of two adjacent load beams 40.

[0083] The protruding portion 801 of the cover layer 80 can be used in conjunction with the reinforcement 60 to connect the two load beams 40, thereby facilitating the improvement of the connection strength and load-bearing capacity of the two load beams 40. At the same time, the force transmission path between the two load beams 40 can also include the load beam 40-cover layer 80-adhesive body 70-cover layer 80-load beam 40, which is conducive to increasing the force transmission path mode, dispersing the force, and reducing the possibility of stress concentration in the load beam 40.

[0084] In some possible implementations, see Fig. 9 As shown, the reinforcement member 60 covers the protruding portion 801. The protruding portion 801 of the cover layer 80 is located below the reinforcement member 60. The reinforcement member 60 can protect the protruding portion 801.

[0085] The reinforcement 60 may be a single-layer structure or a multi-layer structure. For example, the reinforcement 60 may be a single-layer structure including a layer of glass fiber fabric or a multi-layer structure including multiple layers of glass fiber fabric. For example, the proportion of fibers extending along the length direction X in the reinforcement 60 is less than the proportion of fibers extending along the length direction X in the load beam 40. It should be noted that the fibers may extend and distribute along different directions, and the proportion of fibers extending along the length direction X refers to the proportion of fibers extending along the length direction X to all fibers. For example, the reinforcement 60 and the load beam 40 may be made of different materials.

[0086] In some possible implementations, see Fig. 9 As shown, along the length direction X, the covering layer 80 exceeds the reinforcement 60. In the butted load beam 40, along the length direction X, the reinforcement 60 has the covering layer 80 on both opposite sides, which is beneficial to ensure that a connection area is formed between the reinforcement 60 as a whole and the covering layer 80, thereby improving the connection strength and load-bearing capacity between the covering layer 80 and the reinforcement 60.

[0087] In some achievable manners, the elastic modulus of the cover layer 80 is greater than or equal to 8 GPa and less than or equal to 20 GPa. The cover layer 80 and the load beam 40 may be made of different materials.

[0088] In some achievable ways, Fig.11 The partial structure of the cover layer 80 is schematically shown. Fig.11 As shown, the covering layer 80 includes a first fiber 802 and a second fiber 803. The first fiber 802 extends along a first direction Y1. The second fiber 803 extends along a second direction Y2. The angle between the first direction Y1 and the length direction X is 30° to 60°. The angle between the second direction Y2 and the length direction X is 30° to 60°.

[0089] In some examples, the angle between the first direction Y1 and the second direction Y2 is 90°. The angle between the first direction Y1 and the length direction X is 45°. The angle between the second direction Y2 and the length direction X is 45°.

[0090] In the embodiment of the present application, the process of providing the covering layer 80 on the surface of the load-bearing beam 40 can be formed by a vacuum-assisted infusion process. After the covering layer 80 is laid on the load-bearing beam 40, the vacuum-assisted infusion process is used to infiltrate the covering layer 80 with molten adhesive resin. After the adhesive resin is cured, the covering layer 80 is fixedly connected to the load-bearing beam 40.

[0091] The process of setting the covering layer 80 on the surface of the load beam 40 can also be formed by hand lay-up process. After laying the covering layer 80 on the load beam 40, the adhesive is applied to the covering layer 80 by hand lay-up process. After the adhesive is cured, the covering layer 80 is fixedly connected to the load beam 40.

[0092] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wind turbine blade, characterized in that: include: More than two blade modules, each of which is spliced ​​along the length direction of the wind turbine blade, the blade module comprises a load-bearing beam and a covering layer, the load-bearing beam comprises a connected butt joint bevel and a butt joint end face, the covering layer covers the butt joint bevel and the butt joint end face, the rigidity of the covering layer is less than the rigidity of the load-bearing beam, and any two adjacent blade modules are butt jointed, and the butt joint bevels overlap each other; A reinforcing member, covering a gap formed by the butt joint of two adjacent load-bearing beams, and the reinforcing member connects the two adjacent load-bearing beams, and the stiffness of the reinforcing member is less than the stiffness of the load-bearing beams; The adhesive body is used to bond the covering layers corresponding to the butting inclined surfaces of the two load-bearing beams and the reinforcing member and the covering layers.

2. The wind turbine blade according to claim 1, characterized in that: The cover layer includes a plurality of layer bodies, and the plurality of layer bodies are stacked along a thickness direction of the cover layer.

3. The wind turbine blade according to claim 2, characterized in that: The edges of each layer body corresponding to the butt end surface are staggered, and each layer body has a protruding portion that protrudes from the butt end surface along the length direction, and the lengths of each protruding portion are different.

4. The wind turbine blade according to claim 1, characterized in that: The covering layer is a single-layer structure, each of the covering layers is staggered at the edge corresponding to the butt end face, and the covering layer has a protruding portion that protrudes beyond the butt end face along the length direction, and each of the protruding portions has a different length.

5. The wind turbine blade according to claim 3 or 4, characterized in that: In two adjacent blade modules, the protruding portion in one blade module overlaps the covering layer of the other blade module, and the protruding portion covers a gap formed by the butt connection of two adjacent load-bearing beams.

6. The wind turbine blade according to any one of claims 3 to 5, characterized in that: The reinforcement member covers the protruding portion.

7. The wind turbine blade according to any one of claims 3 to 6, characterized in that: The length of the protruding portion close to the reinforcement is greater than the length of the protruding portion far from the reinforcement.

8. The wind turbine blade according to any one of claims 1 to 7, characterized in that: Along the length direction, the covering layer exceeds the reinforcement.

9. The wind turbine blade according to any one of claims 1 to 8, characterized in that: The elastic modulus of the covering layer is greater than or equal to 8 GPa and less than or equal to 20 GPa.

10. The wind turbine blade according to any one of claims 1 to 9, characterized in that: The covering layer includes first fibers and second fibers, the first fibers extend along a first direction, the second fibers extend along a second direction, the angle between the first direction and the length direction is 30° to 60°, and the angle between the second direction and the length direction is 30° to 60°.

11. The wind turbine blade according to any one of claims 1 to 10, characterized in that: The material of the adhesive body includes thermosetting adhesive or thermoplastic resin.

12. The wind turbine blade according to any one of claims 1 to 11, characterized in that: The reinforcement comprises a fiberglass fabric.

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