Wind turbine blade

Abstract

This application relates to a wind turbine blade. The wind turbine blade includes more than two blade modules, a reinforcing member, and an adhesive body. Each blade module is spliced along the length direction of the wind turbine blade. The blade module includes a load-bearing beam and a covering layer. The load-bearing beam includes a butt slope and a butt end surface that are connected. The covering layer covers the butt slope and the butt end surface. The stiffness of the covering layer is less than that of the load-bearing beam. Any two adjacent blade modules are butted, and the butt slopes overlap each other; the reinforcing member covers the gap formed by the butt joint of two adjacent load-bearing beams, and the reinforcing member connects two adjacent load-bearing beams. The stiffness of the reinforcing member is less than that of the load-bearing beam; the covering layers corresponding to the butt slopes of the two load-bearing beams and between the reinforcing member and the covering layer are bonded by the adhesive body. The wind turbine blade provided by this application is beneficial to reducing the possibility of cracking failure due to stress concentration between the two load-bearing beams and improving the service life of the wind turbine blade.

Description

Technical Field

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

[0002] As wind turbine blades become longer and longer, the transportation cost and difficulty increase significantly. To reduce the transportation difficulty and save transportation cost significantly, segmented blades are the main development trend in the future. The main purpose of connecting segmented blades is to ensure continuous and effective load transfer of load-bearing beams such as main beams, secondary beams or trailing edge beams. Generally, the connection of segmented blades is achieved through connection methods such as bonding, pin connection, and bolt connection.

[0003] See 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 docking inclined surface 1A and a first docking end surface 1B. The second blade segment includes a second beam segment. The second beam segment is provided with a second docking inclined surface 1C and a second docking end surface 1D. When the first blade segment and the second blade segment are docked, the first docking inclined surface 1A and the second docking inclined surface 1C overlap and are adhesively connected.

[0004] However, see Figure 2 As shown, in the above-mentioned segmented blade, large stress concentrations occur at both the first docking end surface and the second docking end surface, which easily leads to fatigue fracture at the connection between the first blade segment and the second blade segment, thus affecting the service life of the segmented blade. Summary of the Invention

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

[0006] An embodiment of this application provides a wind turbine blade, which includes more than two blade modules, a reinforcing 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 load-bearing beam and a covering layer. The load-bearing beam includes a connected docking inclined surface and a docking end surface. The covering layer covers the docking inclined surface and the docking end surface. The stiffness of the covering layer is less than that of the load-bearing beam. When any two adjacent blade modules are docked, the docking inclined surfaces overlap each other;

[0008] The reinforcing member covers the gap formed by the docking of two adjacent load-bearing beams, and the reinforcing member connects two adjacent load-bearing beams. The stiffness of the reinforcing member is less than that of the load-bearing beam;

[0009] The covering layers corresponding to the docking inclined surfaces of the two load-bearing beams and between the reinforcing member and the covering layer are adhesively bonded through the adhesive body.

[0010] In the wind turbine blade according to the embodiment of the present application, a covering layer is provided on the docking joint of the load-bearing beam. The covering layer covers the docking inclined plane and the docking end face on the docking joint. The stiffness of the covering layer is less than that of the load-bearing beam. The stiffness of the reinforcing member is less than that of the load-bearing beam. The covering layer can change the force transmission path. Therefore, the force transmission path between the two load-bearing beams includes load-bearing beam - covering layer - adhesive - reinforcing member - adhesive - covering layer - load-bearing beam, which can help disperse the force, reduce the stress concentration at the apex angle of the load-bearing beam, reduce the possibility of cracking failure between the docking end face and the adhesive due to stress concentration, and improve the service life of the wind turbine blade.

[0011] In some implementable ways, the covering layer includes multiple layers, and the multiple layers are stacked along the thickness direction of the covering layer.

[0012] Both the connection strength and the load-bearing capacity of the covering layer including multiple layers can be improved.

[0013] In some implementable ways, the edges corresponding to the docking end face on each layer are staggeredly arranged, each layer has an extending portion extending beyond the docking end face along the length direction, and the lengths of the extending portions are different.

[0014] The edges corresponding to the docking end face on each layer are staggeredly arranged to help reduce the possibility of stress concentration in the edge area of the covering layer and improve the load-bearing capacity of the covering layer.

[0015] In some implementable ways, the covering layer is a single-layer structure, the edges corresponding to the docking end face on each covering layer are staggeredly arranged, the covering layer has an extending portion extending beyond the docking end face along the length direction, and the lengths of the extending portions are different.

[0016] The way that the edges corresponding to the docking end face on each covering layer are staggeredly arranged helps reduce the possibility of stress concentration in the edge area of the covering layer and improve the load-bearing capacity of the covering layer.

[0017] In some implementable ways, in two adjacent blade modules, the extending portion in one blade module overlaps on the covering layer of the other blade module, and the extending portion covers the gap formed by the docking of two adjacent load-bearing beams.

[0018] The extending portion of the covering layer can cooperate with the reinforcing member to connect the two load-bearing beams, which helps improve the connection strength and load-bearing capacity of the two load-bearing beams. At the same time, the force transmission path between the two load-bearing beams can also include load-bearing beam - covering layer - adhesive - covering layer - load-bearing beam, which helps increase the force transmission path ways, disperse the force, and reduce the possibility of stress concentration in the load-bearing beam.

[0019] In some realizable ways, the reinforcing member covers the overhanging portion. The reinforcing member can protect the overhanging portion.

[0020] In some realizable ways, the length of the overhanging portion near the reinforcing member is greater than the length of the overhanging portion far from the reinforcing member.

[0021] In the length direction of the wind turbine blade, the stiffness of the covering layer at the position of the overhanging portion can gradually decrease, that is, change slowly rather than abruptly, which is beneficial to further reduce the possibility of stress concentration at the edge of the covering layer.

[0022] In some realizable ways, along the length direction, the covering layer extends beyond the reinforcing member.

[0023] In the load-bearing beam after docking is completed, along the length direction, both sides of the reinforcing member have covering layers, which is beneficial to ensure that a connection area is formed between the whole reinforcing member and the covering layer, and improve the connection strength and load-bearing capacity between the covering layer and the reinforcing member.

[0024] In some realizable ways, the elastic modulus of the covering layer is greater than or equal to 8 GPa and less than or equal to 20 GPa.

[0025] In some realizable ways, the covering layer includes a first fiber and a second fiber. The first fiber extends along a first direction, and the second fiber extends 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 realizable ways, the material of the adhesive includes thermosetting glue or thermoplastic resin.

[0027] In some realizable ways, the reinforcing member includes a glass fiber fabric. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 2 For Figure 1 It is a schematic diagram of the stress distribution at the butt end face of the segmented blade shown;

[0031] Figure 3 It is a schematic diagram of the structure of a wind power generation unit provided by some embodiments of the present application;

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

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

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

[0035] Figure 7 Schematic diagram of a partial structure of a blade module provided by some embodiments of the present application;

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

[0037] Figure 9 Schematic diagram of a partial structure of a wind turbine blade provided by some embodiments of the present application;

[0038] Figure 10 Schematic diagram of a partial structure of a blade module provided by some embodiments of the present application;

[0039] Figure 11 Schematic diagram of a partial structure of a covering layer provided by some embodiments of the present application.

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

[0041] Explanation of reference numerals:

[0042] 10, Wind turbine generator set;

[0043] 20, Wind turbine blade;

[0044] 30, Housing;

[0045] 40, Bearing beam; 41, Docking inclined plane; 42, Docking end face;

[0046] 50, Blade module;

[0047] 60, Reinforcing member;

[0048] 70, Adhesive body;

[0049] 80, Covering layer; 801, Overhanging part; 802, First fiber; 803, Second fiber; 81, Layer body;

[0050] X, Length direction;

[0051] Y1, First direction;

[0052] Y2, Second direction. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification 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 and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0055] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment may 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.

[0056] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of 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.

[0057] 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, etc. of various components shown in the drawings of the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0058] The term "a plurality" as used in this application refers to two or more (including two).

[0059] Figure 3 Schematically shows the structure of the wind turbine 10. Refer to Figure 3As shown in the figure, an embodiment of the present application provides a wind turbine 10. The wind turbine 10 includes a tower barrel, a nacelle, and a wind wheel. The nacelle is arranged at the top of the tower barrel. The wind wheel includes a hub and wind power blades 20. The wind power blades 20 are connected to the hub. The hub is connected to the main shaft of the nacelle. The wind power blades 20 can generate torque under the action of wind force. The wind power blades 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 Schematically shows the structure of the wind power blade 20. Figure 5 Schematically shows the partial sectional structure of the wind power blade 20. Refer to Figure 4 and Figure 5 As shown in the figure, an embodiment of the present application provides a wind power blade 20. The wind power blade 20 includes a load-bearing beam 40 and a housing 30. The load-bearing beam 40 can be connected to the housing 30.

[0061] In the related art, Figure 6 Schematically shows the partial structure of the wind power blade 20 in the related art. Refer to Figure 6 As shown in the figure, when two load-bearing beams 40 are directly bonded through an adhesive 70 to achieve butt joint, stress concentration exists at the two top corners D1 and D2 of the butt joint end face 42 of the load-bearing beam 40, and there is a possibility that the wind power blade 20 is prone to cracking at the top corners D1 and D2 during subsequent use. One way is to separately use a reinforcing member 60 to connect the two load-bearing beams 40 to facilitate reducing the stress concentration at the top corner D1. However, the inventor further studies and finds that due to the relatively large stiffness of each of the two load-bearing beams 40 itself, the acting 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, resulting in relatively large stress concentration still existing at the top corner D2.

[0062] Figure 7 Schematically shows the partial structure of the blade module 50. Figure 8 Schematically shows the partial structure of the wind power blade 20. Refer to Figure 2 、 Figure 7 and Figure 8 As shown in the figure, an embodiment of the present application provides a wind power blade 20, which includes more than two blade modules 50, a reinforcing member 60, and an adhesive 70.

[0063] Each blade module 50 is spliced along the length direction X of the wind power blade 20. The blade module 50 includes a load-bearing beam 40 and a covering layer 80. The load-bearing beam 40 includes a butt joint inclined surface 41 and a butt joint end surface 42 which are connected. The covering layer 80 covers the butt joint inclined surface 41 and the butt joint end surface 42. The stiffness of the covering layer 80 is less than that of the load-bearing beam 40. Any two adjacent blade modules 50 are butted, and the butt joint inclined surfaces 41 overlap each other. The reinforcing member 60 covers the gap formed by the butt joint of two adjacent load-bearing beams 40, and the reinforcing member 60 connects two adjacent load-bearing beams 40. The stiffness of the reinforcing member 60 is less than that of the load-bearing beam 40. The covering layers 80 corresponding to the butt joint inclined surfaces 41 of the two load-bearing beams 40 and between the reinforcing member 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 a transportation device. Then, each blade module 50 is butted with each other and finally forms a complete wind power blade 20. Therefore, for a wind power blade 20 with a length of more than 100 meters, such a processing method is beneficial to reducing the transportation difficulty and transportation cost.

[0065] After the load-bearing beam 40 is formed, a butt joint inclined surface 41 is cut at one end by a machining method, and the uncut and thickened area forms a butt joint end surface 42. When two blade modules 50 are butted, the load-bearing beams 40 of the two blade modules 50 can be butted with each other at the butt joint inclined surface 41, and the two load-bearing beams 40 are connected by the reinforcing member 60 and the adhesive 70.

[0066] In the embodiment of the present application, the load-bearing beam 40 can be a main beam, a secondary beam or a trailing edge beam. The load-bearing beam 40 can be formed by a pultruded plate or a pultruded laminate. In the fabric forming the corresponding load-bearing beam 40, the proportion of unidirectional fibers extending along the length direction X exceeds 70%. The fibers in the load-bearing beam 40 can include carbon fibers.

[0067] In the embodiment of the present application, the stiffness of the covering layer 80 is less than that of the load-bearing beam 40, so that the covering layer 80 is easier to deform relative to the load-bearing beam 40. Therefore, a load-bearing beam 40 can achieve connection transition through the covering layer 80 with relatively small stiffness. Exemplarily, the covering layer 80 and the load-bearing beam 40 can be bonded and fixed by an adhesive. Exemplarily, the covering layer 80 can be a fabric. For example, the covering layer 80 can include glass fibers. Exemplarily, after the machining of the load-bearing beam 40 is completed, the covering layer 80 can be laid at the end of the load-bearing beam 40. The covering layer 80 covers the butt joint inclined surface 41 and the butt joint end surface 42, and the covering layer 80 is fixedly connected to the load-bearing beam 40.

[0068] In the embodiments of the present application, the bonding body 70 can fill the gap formed by the butt joint of two adjacent load-bearing beams 40. The bonding body 70 can bond the two load-bearing beams 40 with the covering layer 80 and the reinforcing member 60 to form an integral structure, so as to realize the butt joint connection of the two load-bearing beams 40. Exemplarily, the material of the bonding body 70 includes thermosetting glue or thermoplastic resin.

[0069] In the wind turbine blade 20 of the embodiments 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 slope 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 reinforcing member 60 is less than that of the load-bearing beam 40. The covering layer 80 can change the force transmission path. Therefore, the force transmission path between the two load-bearing beams 40 can include load-bearing beam 40 - covering layer 80 - bonding body 70 - reinforcing member 60 - bonding body 70 - covering layer 80 - load-bearing beam 40, which can be beneficial to dispersing the force, reducing the stress concentration at the apex angle D2 of the load-bearing beam 40, reducing the possibility of cracking failure between the butt end face 42 and the bonding body 70 due to stress concentration, and improving the service life of the wind turbine blade 20.

[0070] In some realizable ways, see Figure 7 As shown, the butt end face 42 is also called the leaving-thickness face. The slope of the butt end face 42 is greater than that of the corresponding lapping slope. Wherein, the thickness H of the butt end face 42 is greater than or equal to 0.1 millimeter (mm) and less than or equal to 0.6 millimeter. For example, the thickness H of the butt end face 42 is greater than or equal to 0.2 millimeter and less than or equal to 0.4 millimeter.

[0071] In some realizable ways, Figure 9 Schematically shows the local structure of the wind turbine blade 20. See Figure 9 As shown, the covering layer 80 can be a single-layer structure, that is, the covering layer 80 includes a layer body 81. The edges of each covering layer 80 corresponding to the butt end face 42 are staggered. The covering layer 80 has an overhanging portion 801 extending beyond the butt end face 42 along the length direction X. The lengths of the respective overhanging portions 801 are different.

[0072] The way that the edges of each covering layer 80 corresponding to the butt end face 42 are staggered is beneficial to reducing the possibility of stress concentration in the edge area of the covering layer 80 and beneficial to improving the load-bearing capacity of the covering layer 80.

[0073] Among the two overhangs 801 of the covering layer 80 at the docking end face 42, the length of the overhang 801 closer to the reinforcement 60 is greater than the length of the overhang 801 farther from the reinforcement 60. In the length direction X of the wind turbine blade 20, the stiffness of the covering layer 80 at the position of the overhang 801 can gradually decrease, that is, change slowly rather than abruptly, which is beneficial to further reduce the possibility of stress concentration at the edge of the covering layer 80.

[0074] In some examples, from Figure 9 In the up-and-down direction shown in, the lengths of the overhangs 801 are 80 mm and 110 mm in sequence.

[0075] In some examples, the covering layer 80 can be a single-layer structure. The thickness of the covering layer 80 can be 0.5 mm to 0.9 mm.

[0076] In some implementable ways, Figure 10 Schematically shows the local structure of the blade module 50. Refer to Figure 10 As shown, the covering layer 80 can include a plurality of layers 81. The plurality of layers 81 are stacked in the thickness direction of the covering layer 80. The connection strength and load-bearing capacity of the covering layer 80 including the plurality of layers 81 are both improved.

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

[0078] In some examples, the thickness of the layer 81 can be 0.43 mm to 0.55 mm.

[0079] In some examples, the edges of each layer 81 corresponding to the docking end face 42 are staggered to facilitate reducing the possibility of stress concentration in the edge area of the covering layer 80 and improving the load-bearing capacity of the covering layer 80. Each layer 81 has an overhang 801 extending beyond the docking end face 42 in the length direction X. The lengths of the respective overhangs 801 are different.

[0080] Exemplarily, among any two adjacent layers 81, the length of the overhang 801 closer to the reinforcement 60 is greater than the length of the overhang 801 farther from the reinforcement 60. In the length direction X of the wind turbine blade 20, the stiffness of the covering layer 80 at the position of the overhang 801 can gradually decrease, that is, change slowly rather than abruptly, which is beneficial to further reduce the possibility of stress concentration at the edge of the covering 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. Figure 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 is. Figure 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 Figure 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 Figure 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 Figure 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 realizable ways, the elastic modulus of the covering layer 80 is greater than or equal to 8 GPa and less than or equal to 20 GPa. The covering layer 80 and the load-bearing beam 40 can be made of different materials.

[0088] In some realizable ways, Figure 11 Schematically shows a partial structure of the covering layer 80. Refer to Figure 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 embodiments of the present application, the process of setting the covering layer 80 on the surface of the load-bearing beam 40 can be formed by a vacuum-assisted infusion process. After laying the covering layer 80 on the load-bearing beam 40, the molten bonding resin is infiltrated into the covering layer 80 by a vacuum-assisted infusion process. After the bonding 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-bearing beam 40 can also be formed by a hand lay-up process. After laying the covering layer 80 on the load-bearing beam 40, the bonding adhesive is coated onto the covering layer 80 by a hand lay-up process. After the bonding adhesive is cured, the covering layer 80 is fixedly connected to the load-bearing beam 40.

[0092] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. 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: 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 claim 3 or 4, characterized in that: The reinforcement member covers the protruding portion.

7. The wind turbine blade according to claim 3 or 4, 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 4, 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 4, 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 4, 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 4, 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 4, characterized in that: The reinforcement comprises a fiberglass fabric.

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