A wind turbine blade and a wind power generator set

Abstract

This invention provides a wind turbine blade and a wind turbine generator set. The wind turbine blade includes a first blade segment, a second blade segment, and a blade connecting segment. The first blade segment includes a first shell portion and a first web portion; the second blade segment includes a second shell portion and a second web portion; the blade connecting segment includes a third shell portion and a meshing member. The two ends of the third shell portion are respectively connected to the first shell portion and the second shell portion, and the two ends of the meshing member are respectively connected to the first web portion and the second web portion. The first web portion, the second web portion, and the meshing member are respectively provided with a first toothed surface, a second toothed surface, and a third toothed surface, and the third toothed surface meshes with the first toothed surface and the second toothed surface. This invention can effectively reduce the manufacturing, transportation, and on-site assembly difficulty and overall cost of wind turbine blades; the overall structure is simple and compact, with good connection stability and strong load-bearing capacity, capable of reliably transmitting various loads under complex working conditions, and requires no subsequent maintenance, meeting the requirements for long-term maintenance-free use.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment technology, and in particular to a wind turbine blade and a wind turbine generator set. Background Technology

[0002] With the rapid development of wind power generation technology, wind turbine blades are evolving towards larger and lighter designs. The continuous increase in blade length has brought severe challenges to design, manufacturing, transportation, installation, and subsequent operation and maintenance. Segmented blade design has become an industry consensus.

[0003] Currently, various segmented blade connection technologies have been developed in the industry, mainly including: (1) Bolt connection technology. Although this technology is widely used, the use of a large number of bolts increases the quality of the segment and requires regular maintenance, making it difficult to meet the maintenance-free requirements; (2) Torque box connection technology. This technology requires the selection of a location with a relatively regular blade cross section and a large square area. Its load-bearing capacity is significantly affected by the square size and wall thickness, and increasing the wall thickness will significantly increase the quality of the torque box; (3) Adhesive bonding technology. Its load-bearing capacity is highly dependent on the interface adhesive strength, and its reliability is limited; (4) Metal composite material sandwich-bolt clamping technology. It has high requirements for processing technology; (5) Interference fit and pin locking technology. Its load-bearing capacity is small and it is difficult to meet the load requirements of large blades; (6) Dovetail wedge block connection technology. It has strict requirements for processing and assembly technology.

[0004] While the aforementioned existing technologies have addressed some of the problems arising from the increasing size of blades, they still generally suffer from the following shortcomings: difficulty in achieving true maintenance-free operation, excessively high requirements for processing and assembly techniques, and limited load-bearing capacity. Therefore, there is an urgent need to develop a new segmented blade connection technology that is simple in structure, highly reliable, maintenance-free, and can reduce manufacturing, transportation, and assembly costs. Summary of the Invention

[0005] The purpose of this invention is to provide a wind turbine blade and a wind turbine generator set, aiming to design a new segmented blade connection technology that is simple in structure, highly reliable, maintenance-free, and can reduce manufacturing, transportation and assembly costs.

[0006] To solve the above-mentioned technical problems, the present invention provides a wind turbine blade, comprising: The first blade segment extends along the span of the wind turbine blade and includes a connected first housing portion and a first web portion, with at least a portion of the first web portion located within the first housing portion. The second blade segment is arranged at intervals with the first blade segment in the spanwise direction. The second blade segment extends along the spanwise direction and includes a connected second shell portion and a second web portion. At least a portion of the second web portion is located within the second shell portion. A blade connecting section is located between the first blade segment and the second blade segment. The blade connecting section extends along the spanwise direction. The blade connecting section includes a third housing portion and a meshing member. The two ends of the third housing portion are respectively connected to the first housing portion and the second housing portion. At least a portion of the meshing member is located inside the third housing portion. The two ends of the meshing member are respectively connected to the first web portion and the second web portion. The first web portion, the second web portion, and the meshing member are respectively provided with a first toothed surface, a second toothed surface, and a third toothed surface. The portion of the third toothed surface near the first web portion meshes with the first toothed surface, and the portion of the third toothed surface near the second web portion meshes with the second toothed surface.

[0007] In some embodiments, the first web portion and the second web portion are connected by two meshing members arranged at intervals in the chordal direction of the wind turbine blade, with the first web portion and the second web portion located between the two meshing members.

[0008] In some embodiments, the first web portion and the second web portion are both connected to the two meshing members by screws, and the first web portion, the second web portion, and the meshing members are respectively provided with a first through hole, a second through hole, and a third through hole along the chord direction for the screws to pass through.

[0009] In some embodiments, the first tooth surface, the second tooth surface, and the third tooth surface each include a plurality of first convex teeth, a plurality of second convex teeth, and a plurality of third convex teeth. The plurality of first convex teeth are arranged at intervals in the spanwise direction. A first tooth groove is formed between two adjacent first convex teeth to accommodate the third convex tooth. A second tooth groove is formed between two adjacent second convex teeth to accommodate the third convex tooth. A third tooth groove is formed between two adjacent third convex teeth to accommodate either the first convex tooth or the second convex tooth.

[0010] In some embodiments, the first perforation is disposed at the first tooth groove, the second perforation is disposed at the second tooth groove, and the third perforation is disposed at the third protruding tooth.

[0011] In some embodiments, the third through hole includes a first countersunk hole and a second countersunk hole respectively disposed in the two engaging members, the threaded member includes a threaded bolt and a nut, the head of the bolt is located in the first countersunk hole, and the tail of the bolt and the nut are located in the second countersunk hole.

[0012] In some embodiments, the first web portion and the second web portion are both connected to the two meshing members by multiple rows of threaded members spaced apart in the span direction, each row of threaded members including multiple threaded members spaced apart along the extension direction of the third tooth groove.

[0013] In some embodiments, the first tooth, the second tooth, and the third tooth are all arranged to extend along the thickness direction of the wind turbine blade.

[0014] In some embodiments, the first convex tooth, the second convex tooth, and the third convex tooth are all trapezoidal convex teeth.

[0015] In some embodiments, the connection points between the two meshing members and the first web portion and the second web portion are wrapped with a winding layer.

[0016] In some embodiments, the end of the first web portion near the second blade segment and the end of the second web portion near the first blade segment are both located within the third housing portion.

[0017] In some embodiments, the first web portion near the end face of the meshing member is connected to the second web portion near the end face of the meshing member.

[0018] In some embodiments, the first web portion includes a first main body segment and a first reinforcing segment extending along the spanwise direction. The end of the first main body segment near the second blade segment is connected to the end of the first reinforcing segment away from the second blade segment. The strength of the first reinforcing segment is greater than that of the first main body segment. The first reinforcing segment is provided with the first toothed surface.

[0019] In some embodiments, the second web portion includes a second main body segment and a second reinforcing segment extending along the spanwise direction. The end of the second main body segment near the first blade segment is connected to the end of the second reinforcing segment away from the second blade segment. The strength of the second reinforcing segment is greater than that of the second main body segment, and the second reinforcing segment is provided with the second toothed surface.

[0020] In some embodiments, a first slot is provided on the end face of the first main body segment near the second blade segment, and the end of the first reinforcing segment away from the second blade segment is wrapped with a first covering layer and inserted into the first slot.

[0021] In some embodiments, the second main body segment is provided with a second slot on the end face near the first blade segment, and the end of the second reinforcing segment away from the first blade segment is wrapped with a second covering layer and inserted into the second slot.

[0022] In some embodiments, multiple first web portions and second web portions are provided at intervals along the chord direction of the fan blade, and each first web portion is connected to a second web portion via the meshing member.

[0023] In some embodiments, the first housing portion and the third housing portion are bonded together by adhesive.

[0024] In some embodiments, a first stop structure is provided between the first housing portion and the third housing portion.

[0025] In some embodiments, the second housing portion and the third housing portion are bonded together by adhesive.

[0026] In some embodiments, a second stop structure is provided between the second housing portion and the third housing portion.

[0027] To achieve the above objectives, the present invention also provides a wind turbine generator set, including the wind turbine blades described above.

[0028] Compared with the prior art, the present invention has the following beneficial effects: The wind turbine blades of this invention adopt a spanwise segmented structure design, which arranges the wind turbine blades in segments along the spanwise direction, effectively reducing the difficulty and overall cost of manufacturing, transportation and on-site assembly of the wind turbine blades; at the same time, the segmented docking positions of the wind turbine blades adopt a tooth surface meshing structure to achieve a mating connection, the overall structure is simple and compact, with good connection stability and strong load-bearing capacity, which can reliably transmit various loads under complex working conditions, and requires no subsequent maintenance, meeting the requirements for long-term maintenance-free use. Attached Figure Description

[0029] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0030] Figure 1 This is a schematic diagram of the structure of the wind turbine blades in an embodiment of the present invention; Figure 2 for Figure 1 Side view of the blades of a medium-sized wind turbine; Figure 3 for Figure 2 Sectional view along the middle AA direction; Figure 4 for Figure 3 A schematic diagram of the structure of the first reinforcing section, the second reinforcing section, and the meshing component; Figure 5 for Figure 4 A schematic diagram of the structure after the middle winding layer is removed; Figure 6 for Figure 3 A schematic diagram of the connection between the first and second web sections and the meshing parts; Figure 7 for Figure 6 A magnified view of a section at point B in the middle; Figure 8 for Figure 3 A schematic diagram of the structure at the connection between the first shell section, the second shell section and the third shell section; Figure 9 for Figure 8 A magnified view of a section at point C; Figure 10 for Figure 8 A magnified view of a section at point D; Figure 11 for Figure 3 A schematic diagram of the structure of the first reinforcing section, the second reinforcing section, and the meshing parts.

[0031] Explanation of reference numerals in the accompanying drawings of this invention: Wind turbine blade 100, first blade segment 1, first housing portion 11, first stop surface 111, first web portion 12, first large web portion 12a, first small web portion 12b, first main body segment 121, first large main body segment 121a, first large main body segment 121b, first reinforcing segment 122, first large reinforcing segment 122a, first small reinforcing segment 122b, first slot 123, first covering layer 124, first toothed surface 13, first protruding tooth 131, first tooth groove 132, first perforation 14, second blade segment 2, second housing portion 21, second stop surface 211, second web portion 22, second large web portion 22a, second small web portion 22b, second main body segment 221, second large main body segment 221a, second... Main body section 221b, second reinforcing section 222, second large reinforcing section 222a, second small reinforcing section 222b, second slot 223, second covering layer 224, second tooth surface 23, second protruding tooth 231, second tooth groove 232, second through hole 24, blade connecting section 3, third housing part 31, third stop surface 311, fourth stop surface 312, meshing part 32, first meshing part 32a, second meshing part 32b, large meshing part 32c, small meshing part 32d, third tooth surface 33, third protruding tooth 331, third tooth groove 332, third through hole 34, first countersunk hole 34a, second countersunk hole 34b, winding layer 35, screw connector 4, bolt 41, nut 42, first stop structure 5a, second stop structure 5b.

[0032] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0036] This invention provides a wind turbine blade that can be used in wind turbine generator sets. Figures 1 to 11 Some embodiments of the wind turbine blades provided by the present invention are shown.

[0037] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 11In some embodiments, the wind turbine blade 100 includes a first blade segment 1, a second blade segment 2, and a blade connecting segment 3. The first blade segment 1 extends along the spanwise direction of the wind turbine blade 100 and includes a connected first housing portion 11 and a first web portion 12, with at least a portion of the first web portion 12 located within the first housing portion 11. The second blade segment 2 is arranged at intervals from the first blade segment 1 in the spanwise direction and extends along the spanwise direction. The second blade segment 2 includes a connected second housing portion 21 and a second web portion 22, with at least a portion of the second web portion 22 located within the second housing portion 21. The blade connecting segment 3 is located between the first blade segment 1 and the second blade segment 2. The blade connecting section 3 extends along the spanwise direction and includes a third housing portion 31 and a meshing member 32. The two ends of the third housing portion 31 are respectively connected to the first housing portion 11 and the second housing portion 21. At least a portion of the meshing member 32 is located inside the third housing portion 31, and the two ends of the meshing member 32 are respectively connected to the first web portion 12 and the second web portion 22. The first web portion 12, the second web portion 22, and the meshing member 32 are respectively provided with a first toothed surface 13, a second toothed surface 23, and a third toothed surface 33. The portion of the third toothed surface 33 near the first web portion 12 meshes with the first toothed surface 13, and the portion of the third toothed surface 33 near the second web portion 22 meshes with the second toothed surface 23.

[0038] Specifically, the wind turbine blade 100 has a blade root and a blade tip. The blade root of the wind turbine blade 100 is used to connect with the hub in the wind turbine generator set to mount the wind turbine blade 100 onto the hub. The spanwise direction of the wind turbine blade 100 is from the blade root to the blade tip. The wind turbine blade 100 is divided into at least three blade segments along its spanwise direction. The at least three blade segments include a first blade segment 1, a second blade segment 2, and a blade connecting segment 3. The at least three blade segments are spliced ​​together along the spanwise direction of the wind turbine blade 100 to form a complete wind turbine blade 100. The specific number of blade segments can be set according to actual conditions. For example, the wind turbine blade 100 can be divided into three, four, five, six, seven, eight, or more blade segments. The following description uses the example of a wind turbine blade 100 being divided into three blade segments: the first blade segment 1, the second blade segment 2, and the blade connecting segment 3. These three segments are joined together along the span of the wind turbine blade 100 to form a three-segment wind turbine blade 100. The span of the wind turbine blade 100 is defined as left-right. The side of the blade connecting segment 3 closest to the first blade segment 1 is the left side of the blade connecting segment 3, and the side of the blade connecting segment 3 closest to the second blade segment 2 is the right side of the blade connecting segment 3.

[0039] The first blade segment 1 includes a first housing portion 11 and a first web portion 12 connected together. Both the first housing portion 11 and the first web portion 12 extend in a front-rear direction. The first housing portion 11 and the first web portion 12 are typically fixedly connected during the manufacturing of the first blade segment 1 using an integral injection molding process. Similarly, the second blade segment 2 includes a second housing portion 21 and a second web portion 22 connected together. Both the second housing portion 21 and the second web portion 22 extend in a front-rear direction. The second housing portion 21 and the second web portion 22 are typically fixedly connected during the manufacturing of the second blade segment 2 using an integral injection molding process.

[0040] The blade connecting section 3 is located between the first blade segment 1 and the second blade segment 2. The blade connecting section 3 includes a third housing part 31 and a meshing member 32, both of which extend in the front-rear direction. The left end of the third housing part 31 is connected to the right end of the first housing part 11, and the right end of the third housing part 31 is connected to the left end of the second housing part 21. In this way, the first housing part 11, the second housing part 21, and the third housing part 31 are spliced ​​together to form the housing of the wind turbine blade 100, thereby ensuring the integrity and continuity of the external aerodynamic structure of the wind turbine blade 100. Similarly, the left end of the meshing member 32 connects with the right end of the first web portion 12, and the right end of the meshing member 32 connects with the left end of the second web portion 22. Thus, the meshing member 32 achieves a centered connection and force transmission between the first web portion 12 and the second web portion 22. Furthermore, the first web portion 12, the second web portion 22, and the meshing member 32 are joined to form the web of the wind turbine blade 100. This composite structure of the shell and the web enhances the overall structural strength and bending and shear resistance of the wind turbine blade 100. The specific material of the meshing member 32 can be determined according to actual conditions. For example, the meshing member 32 can be made of metal. The following description will use a pre-embedded metal part as an example.

[0041] The right end of the first web portion 12 is provided with a first toothed surface 13, the left end of the second web portion 22 is provided with a second toothed surface 23, and the meshing member 32 is provided with a third toothed surface 33. A part of the third toothed surface 33 meshes with the first toothed surface 13, and the other part of the third toothed surface 33 meshes with the second toothed surface 23. In this way, the first toothed surface 13 on the first web portion 12, the second toothed surface 23 on the second web portion 22, and the third toothed surface 33 on the meshing member 32 form a bidirectional toothed surface meshing engagement. The load is transmitted by toothed engagement and compression contact, which effectively limits the relative slippage and misalignment of each component, evenly distributes the bending, shearing, and tensile loads of the wind turbine blade 100 during operation, and significantly improves the connection stiffness and load-bearing limit of the segmented docking position of the wind turbine blade 100. The built-in meshing layout can reduce the impact of external environmental erosion, reduce structural wear and aging problems, simplify the segmented blade assembly process, reduce the production, transportation, and assembly costs of the wind turbine blade 100, and ensure that the connection structure is stable and reliable, which is conducive to long-term maintenance-free service.

[0042] The wind turbine blade 100 of the present invention adopts a spanwise segmented structure design, which arranges the wind turbine blade 100 in segments along the spanwise direction, effectively reducing the manufacturing, transportation and on-site assembly difficulty and overall cost of the wind turbine blade 100; at the same time, the segmented docking positions of the wind turbine blade 100 adopt a tooth surface meshing structure to achieve a mating connection, the overall structure is simple and compact, the connection stability is good, the load-bearing capacity is strong, it can reliably transmit various loads under complex working conditions, and no subsequent maintenance is required, meeting the requirements for long-term maintenance-free use.

[0043] The specific fixing method between the first housing part 11 and the third housing part 31 can be set according to the actual situation. For example, the first housing part 11 and the third housing part 31 can be fixedly connected by adhesive bonding, bolt connection, or interference fit. Optionally, please refer to Figure 1 , Figure 8 and Figure 9 In some embodiments, the first housing portion 11 and the third housing portion 31 are bonded together with adhesive.

[0044] Specifically, the first housing part 11 and the third housing part 31 are bonded together with adhesive, which allows the mating surfaces of the first housing part 11 and the third housing part 31 to fit tightly and connect seamlessly. This ensures that the joint between the first housing part 11 and the third housing part 31 has a continuous and flat shape, maintains the overall aerodynamic integrity of the fan blade 100, and reduces operating wind resistance. The adhesive connection method distributes the force evenly, which can buffer vibration loads and avoid stress concentration at the mating position of the first housing part 11 and the third housing part 31. This improves the sealing performance and structural integrity of the connection between the first housing part 11 and the third housing part 31. At the same time, the assembly process is simple, the connection is stable and reliable, and the splicing gaps can be reduced.

[0045] Optionally, please refer to Figure 1 , Figure 8 and Figure 9 In some embodiments, a first stop structure 5a is provided between the first housing portion 11 and the third housing portion 31.

[0046] Specifically, a first stop structure 5a is provided between the first housing portion 11 and the third housing portion 31. The first stop structure 5a includes a right-facing first stop surface 111 and a left-facing third stop surface 311. The first stop surface 111 is located at the right end of the first housing portion 11 and abuts against the left end surface of the third housing portion 31. The third stop surface 311 is located at the left end of the third housing portion 31 and abuts against the right end surface of the first housing portion 11. When the first stop surface 111 is located on the outer peripheral side surface of the first housing portion 11, the third stop surface 311 is located on the inner peripheral side surface of the third housing portion 31; when the first stop surface 111 is located on the inner peripheral side surface of the first housing portion 11, the third stop surface 311 is located on the outer peripheral side surface of the third housing portion 31. The first stop structure 5a can accurately position and limit the first housing part 11 and the third housing part 31 in the circumferential and longitudinal directions, effectively preventing relative offset, misalignment and slippage between the first housing part 11 and the third housing part 31, and improving the assembly accuracy of the housing docking.

[0047] Similarly, the specific fixing method between the second housing part 21 and the third housing part 31 can be set according to the actual situation. For example, the second housing part 21 and the third housing part 31 can be fixedly connected by adhesive bonding, bolt connection, or interference fit. Optionally, please refer to Figure 1 , Figure 8 and Figure 10 In some embodiments, the second housing portion 21 and the third housing portion 31 are bonded together with adhesive.

[0048] Specifically, the second housing part 21 and the third housing part 31 are bonded together with adhesive, which allows the mating surfaces of the second housing part 21 and the third housing part 31 to fit tightly and seamlessly, ensuring that the joint between the second housing part 21 and the third housing part 31 has a continuous and flat shape, maintaining the overall aerodynamic integrity of the fan blade 100, and reducing operating wind resistance. The adhesive connection method distributes the force evenly, which can buffer vibration loads and avoid stress concentration at the mating position of the second housing part 21 and the third housing part 31, improving the sealing performance and structural integrity of the connection between the second housing part 21 and the third housing part 31. At the same time, the assembly process is simple, the connection is stable and reliable, and the splicing gaps can be reduced.

[0049] Optionally, please refer to Figure 1 , Figure 8 and Figure 10In some embodiments, a second stop structure 5b is provided between the second housing portion 21 and the third housing portion 31.

[0050] Specifically, a second stop structure 5b is provided between the second housing portion 21 and the third housing portion 31. The second stop structure 5b includes a left-facing second stop surface 211 and a right-facing fourth stop surface 312. The second stop surface 211 is located at the left end of the second housing portion 21 and abuts against the right end surface of the third housing portion 31. The fourth stop surface 312 is located at the right end of the third housing portion 31 and abuts against the left end surface of the second housing portion 21. When the second stop surface 211 is located on the outer peripheral side surface of the second housing portion 21, the fourth stop surface 312 is located on the inner peripheral side surface of the third housing portion 31; when the second stop surface 211 is located on the inner peripheral side surface of the second housing portion 21, the fourth stop surface 312 is located on the outer peripheral side surface of the third housing portion 31. The second stop structure 5b can accurately position and limit the second housing part 21 and the third housing part 31 in the circumferential and longitudinal directions, effectively preventing relative offset, misalignment and slippage between the second housing part 21 and the third housing part 31, and improving the assembly accuracy of the housing docking.

[0051] The left and right end faces of the third housing part 31 are designed to form stop structures with the right end face of the first housing part 11 and the left end face of the second housing part 21, respectively, and are combined with adhesive bonding to achieve a fixed connection between the first housing part 11, the second housing part 21 and the third housing part 31. The geometric dimensions of the first stop structure 5a and the second stop structure 5b can be determined by finite element calculation optimization.

[0052] The first web portion 12 and the second web portion 22 can be connected by a single engaging member 32; alternatively, the first web portion 12 and the second web portion 22 can be connected by multiple engaging members 32. Alternatively, please refer to... Figure 5 , Figure 7 and Figure 8 In some embodiments, the first web portion 12 and the second web portion 22 are connected by two meshing members 32 arranged at intervals in the chordal direction of the fan blade 100, with the first web portion 12 and the second web portion 22 located between the two meshing members 32.

[0053] Specifically, the chord direction of the wind turbine blade 100 is from the leading edge to the trailing edge of the wind turbine blade 100. The first web portion 12 and the second web portion 22 are connected by two meshing members 32 arranged at intervals in the chord direction of the wind turbine blade 100. The first web portion 12 and the second web portion 22 are limited between the two meshing members 32. The meshing members 32 arranged on both sides can evenly distribute the various loads in the chord direction, flapping direction and shear direction of the blade, so that the force distribution is uniform and avoids the concentration of force on one side. At the same time, the chord direction double-piece limiting structure can effectively limit the relative offset and torsional misalignment between the first web portion 12 and the second web portion 22, and improve the overall stiffness and connection stability of the first web portion 12 and the second web portion 22. The following description will take the connection between the first web portion 12 and the second web portion 22 through two meshing members 32 arranged at intervals along the chord direction of the fan blade 100 as an example. The chord direction of the fan blade 100 is defined as the up-down direction. The upper and lower surfaces of the first web portion 12 are provided with first toothed surfaces 13. The upper and lower surfaces of the second web portion 22 are provided with second toothed surfaces 23. The lower surface of the meshing member 32 located on the upper side is provided with a third toothed surface 33, and the upper surface of the meshing member 32 located on the lower side is provided with a third toothed surface 33.

[0054] The specific arrangement of the first tooth face 13, the second tooth face 23, and the third tooth face 33 can be set according to the actual situation. For example, the shapes of the first tooth face 13, the second tooth face 23, and the third tooth face 33 are usually matched. Optionally, please refer to Figure 7 and Figure 11 In some embodiments, the first tooth surface 13, the second tooth surface 23, and the third tooth surface 33 respectively include a plurality of first protruding teeth 131, a plurality of second protruding teeth 231, and a plurality of third protruding teeth 331. The plurality of first protruding teeth 131 are arranged at intervals in the spanwise direction. A first tooth groove 132 for accommodating a third protruding tooth 331 is formed between two adjacent first protruding teeth 131. A second tooth groove 232 for accommodating a third protruding tooth 331 is formed between two adjacent second protruding teeth 231. A third tooth groove 332 for accommodating a first protruding tooth 131 or a second protruding tooth 231 is formed between two adjacent third protruding teeth 331.

[0055] Specifically, the first tooth surface 13, the second tooth surface 23, and the third tooth surface 33 are respectively provided with a plurality of first protruding teeth 131, a plurality of second protruding teeth 231, and a plurality of third protruding teeth 331. The plurality of first protruding teeth 131 are arranged at intervals along the left and right direction, and a first tooth groove 132 is formed between two adjacent first protruding teeth 131 for the third protruding teeth 331 to be fitted and engaged. The plurality of second protruding teeth 231 are arranged at intervals along the left and right direction, and a second tooth groove 232 is formed between two adjacent second protruding teeth 231. The plurality of third protruding teeth 331 are arranged at intervals along the left and right direction, and a third tooth groove 332 is formed between two adjacent third protruding teeth 331 for accommodating a first protruding tooth 131 or a second protruding tooth 231. By interlocking and meshing the convex teeth and tooth grooves, precise meshing and positioning of each tooth surface can be achieved. Reliable limiting can be formed in multiple dimensions such as span, shear and torsion, effectively preventing relative slippage and misalignment of the mating parts, increasing the contact area of ​​the tooth surface, so that the load is evenly distributed and transmitted, avoiding the problem of local stress concentration, and significantly improving the connection strength, overall stiffness and shear bearing capacity of the mating position of the first web part 12, the second web part 22 and the meshing part 32.

[0056] The first protruding tooth 131, the second protruding tooth 231, and the third protruding tooth 331 are typically elongated. The extension direction of the first protruding tooth 131, the second protruding tooth 231, and the third protruding tooth 331 can be the thickness direction of the fan blade 100 (i.e., from the windward side to the leeward side of the fan blade 100; hereinafter, the thickness direction of the fan blade 100 is defined as the front-to-back direction). Alternatively, the extension direction of the first protruding tooth 131, the second protruding tooth 231, and the third protruding tooth 331 can also be inclined at a certain angle relative to the thickness direction of the fan blade 100. Optionally, please refer to... Figure 11 In some embodiments, the first tooth 131, the second tooth 231, and the third tooth 331 are all extended along the thickness direction of the fan blade 100.

[0057] Specifically, the first tooth 131, the second tooth 231, and the third tooth 331 are all arranged along the thickness direction of the wind turbine blade 100, which reasonably limits the extension direction of the first tooth 131, the second tooth 231, and the third tooth 331, so that the tooth body runs through the thickness direction of the wind turbine blade 100, increasing the effective contact area and meshing length of the tooth surface, and strengthening the fitting and limiting effect in the thickness direction. This arrangement can fully adapt to the transmission requirements of blade flapping load and thickness direction compressive load, improve the shear and compressive resistance of the tooth surface, avoid loosening and misalignment at the meshing position, evenly distribute the force under alternating working conditions, reduce stress concentration, effectively improve the meshing stability, overall connection strength and structural durability of the first tooth surface 13, the second tooth surface 23 and the third tooth surface 33, and ensure long-term reliable load-bearing operation at the segmented blade connection.

[0058] The cross-sectional shapes of the first protruding tooth 131, the second protruding tooth 231, and the third protruding tooth 331 can be set according to actual conditions. For example, the cross-sectional shapes of the first protruding tooth 131, the second protruding tooth 231, and the third protruding tooth 331 can be trapezoidal, triangular, square, or arc-shaped. Optionally, please refer to... Figure 11 In some embodiments, the first protrusion 131, the second protrusion 231, and the third protrusion 331 are all trapezoidal protrusions.

[0059] Specifically, the first tooth 131, the second tooth 231, and the third tooth 331 are all designed as trapezoidal structures such as right-angled trapezoids or isosceles trapezoids. The trapezoidal teeth have a sloped transition and reasonable tooth root size, with a larger tooth root thickness and higher structural strength, which can effectively reduce the stress concentration phenomenon at the tooth root and avoid fracture damage under long-term alternating loads. At the same time, the trapezoidal teeth have a good guiding and alignment effect when meshing, which facilitates the quick and accurate assembly and meshing of the first tooth surface 13, the second tooth surface 23, and the third tooth surface 33. The tooth surface contact force is uniform, which can improve the overall tensile, shear and torsional load-bearing capacity. During the meshing process, a moderate self-locking effect can be formed to prevent the tooth surface from loosening and disengaging, significantly enhancing the connection firmness and structural stability of each meshing structure, and meeting the long-term load-bearing requirements of the wind turbine blade under complex working conditions.

[0060] Optionally, please refer to Figure 5 , Figure 7 and Figure 11 In some embodiments, the first web portion 12 and the second web portion 22 are connected to two meshing members 32 by screws 4. The first web portion 12, the second web portion 22, and the meshing members 32 are respectively provided with a first through hole 14, a second through hole 24, and a third through hole 34 through the screws 4 along the chord direction.

[0061] Specifically, the first web portion 12 and the second web portion 22 are fastened to the two meshing parts 32 by means of screw connectors 4. The first web portion 12, the second web portion 22 and the meshing parts 32 are provided with a first through hole 14, a second through hole 24 and a third through hole 34 through the top and bottom, which allows the screw connectors 4 to be installed. In this way, the first web portion 12, the second web portion 22 and the two meshing parts 32 can be locked and fixed from top to bottom by means of screw connectors 4. With the tooth surface meshing structure, a dual connection limit of mechanical fitting and bolt fastening is formed, which effectively limits the relative displacement of each component in the chord, span, and torsion directions, improves the overall connection rigidity and anti-loosening ability of the splicing position, and makes the load transmission more balanced and stable.

[0062] The specific location of the first perforation 14 on the first web portion 12 can be set according to actual conditions. For example, the first perforation 14 can be located at the first protruding tooth 131 or the first tooth groove 132. Similarly, the specific location of the second perforation 24 on the second web portion 22 can be set according to actual conditions. For example, the second perforation 24 can be located at the second protruding tooth 231 or the second tooth groove 232. Optionally, please refer to... Figure 7 and Figure 11 In some embodiments, the first through hole 14 is disposed at the first tooth groove 132, the second through hole 24 is disposed at the second tooth groove 232, and the third through hole 34 is disposed at the third protruding tooth 331.

[0063] Specifically, the first through hole 14 is located at the first tooth groove 132, the second through hole 24 is located at the second tooth groove 232, and the third through hole 34 is located at the third protruding tooth 331. This arrangement ensures that the through hole position of the screw connector 4 corresponds precisely to the tooth groove and protruding tooth structure. This layout can reasonably avoid weak areas of the tooth body, utilize the solid structure of the tooth groove and protruding tooth to bear the locking force, avoid opening holes in the key stress area of ​​the protruding tooth and weakening the tooth surface structure strength, reduce stress concentration, and at the same time make the fastening force of the screw connector 4 and the tooth surface meshing force cooperate and share the force, further improving the connection tightness and integrity between the first web portion 12, the second web portion 22 and the meshing member 32, and effectively preventing the tooth surface meshing structure from loosening or shifting.

[0064] The specific number of threaded connectors 4 between the first web portion 12, the second web portion 22, and the engaging member 32 can be set according to the actual situation. For example, one or more threaded connectors 4 can be provided between the first web portion 12 and the two engaging members 32. Similarly, one or more threaded connectors 4 can also be provided between the second web portion 22 and the two engaging members 32. Optionally, please refer to Figure 5 In some embodiments, the first web portion 12 and the second web portion 22 are both connected to the two meshing members 32 by multiple rows of threaded members 4 arranged at intervals in the spanwise direction. Each row of threaded members 4 includes multiple threaded members 4 arranged at intervals along the extension direction of the third tooth groove 332.

[0065] Specifically, the first web portion 12, the second web portion 22, and the two meshing parts 32 are locked and fixed by multiple rows of screw connectors 4 arranged at intervals along the left and right directions, and each row of screw connectors 4 is evenly spaced along the front and back directions. The multi-row, multi-point arrangement can disperse the locking stress and alternating load, avoid local overload, and make the contact stress of the first web portion 12, the second web portion 22, and the two meshing parts 32 more uniform. Combined with the tooth surface meshing structure, a composite limiting lock is formed, which effectively restricts the relative displacement of each component in the spanwise, chordal, and thickness directions, improves the overall tightness and anti-loosening ability of the connection structure, and enhances the structural rigidity of the segmented blade docking position.

[0066] The specific configuration of the threaded connector 4 can be set according to the actual situation. For example, the threaded connector 4 can be a bolt 41; the threaded connector 4 can also be a combination of a bolt 41 and a nut 42. Optionally, please refer to... Figure 5 and Figure 7 In some embodiments, the third through hole 34 includes a first countersunk hole 34a and a second countersunk hole 34b respectively disposed in the two engaging members 32, and the screwed member 4 includes a threaded bolt 41 and a nut 42, with the head of the bolt 41 located in the first countersunk hole 34a and the tail of the bolt 41 and the nut 42 located in the second countersunk hole 34b.

[0067] Specifically, the third through hole 34 includes a first countersunk hole 34a and a second countersunk hole 34b respectively disposed on the two meshing members 32. The two meshing members 32 are the first meshing member 32a and the second meshing member 32b. The first countersunk hole 34a is disposed on the first meshing member 32a, and the second countersunk hole 34b is disposed on the second meshing member 32b. The screw connector 4 consists of a bolt 41 and a nut 42 that are threaded together. The head of the bolt 41 is housed inside the first countersunk hole 34a, and the tail of the bolt 41 and the nut 42 are housed in the second countersunk hole 34b. In this way, through the countersunk hole embedded installation structure, the bolt 41 and the nut 42 can be completely hidden inside the meshing member 32, preventing the bolt 41 and the nut 42 from being exposed and protruding from the two meshing members 32.

[0068] Optionally, please refer to Figure 4 and Figure 5 In some embodiments, the connection points between the two meshing members 32 and the first web portion 12 and the second web portion 22 are wrapped with a winding layer 35.

[0069] Specifically, the winding layer 35 is made of a high-strength, high-modulus material. For example, the winding layer 35 can be made of high-strength composite materials such as fiber-reinforced resin-based composite materials. The outer sides of the connection positions between the two meshing parts 32 and the first web portion 12 and the second web portion 22 are covered with the winding layer 35. The winding layer 35 forms an overall wrapping reinforcement for each mating area, which can restrain the relative displacement between the meshing parts 32 and the web portion, help improve the integrity and clamping force of the connection structure, and compensate for the preload reduction caused by the long-term service of the bolted parts 4. At the same time, it can cover and protect the meshing area of ​​the tooth surface and the fastener structure, prevent moisture and impurities from entering the contact gap, slow down the corrosion and aging of components, reduce the risk of loosening and wear, further optimize the stress state at the connection, enhance the fatigue resistance and structural stability of the segmented blade mating position, and ensure the long-term maintenance-free reliable operation of the wind turbine blade 100 splicing structure.

[0070] The right end of the first web portion 12 can be located within the first housing portion 11; the right end of the first web portion 12 can also extend into the third housing portion 31. Similarly, the left end of the second web portion 22 can be located within the second housing portion 21; the left end of the second web portion 22 can also extend into the third housing portion 31. Optionally, please refer to... Figure 3 and Figure 8 In some embodiments, the end of the first web portion 12 near the second blade segment 2 and the end of the second web portion 22 near the first blade segment 1 are both located inside the third housing portion 31.

[0071] Specifically, the right end of the first web portion 12 and the left end of the second web portion 22 are both housed within the third housing portion 31, so that the tooth meshing structure of the wind turbine blade 100 is entirely within a closed protective space (i.e., the third housing portion 31). The third housing portion 31 can form an external protective barrier, effectively isolating external environmental factors such as wind, sand, water vapor, and moisture, and preventing corrosion and aging damage to the tooth meshing structure and the bolted connection 4.

[0072] The right end of the first web portion 12 and the left end of the second web portion 22 can be spaced apart horizontally and upwardly; the right end of the first web portion 12 and the left end of the second web portion 22 can also abut against each other horizontally and upwardly. Optionally, please refer to Figure 3 and Figure 8 In some embodiments, the first web portion 12 near the end face of the engaging member 32 is connected to the second web portion 22 near the end face of the engaging member 32.

[0073] Specifically, the right end face of the first web portion 12 and the left end face of the second web portion 22 are mated together, shortening the force transmission distance between the first web portion 12 and the second web portion 22, forming a continuous and regular internal load-bearing structure. This structure can efficiently transmit the tensile, bending and shear loads during the operation of the wind turbine blade 100, reducing load loss. At the same time, this end face mating method can limit the relative swaying and misalignment of the first web portion 12 and the second web portion 22, improve the fit, structural integrity and connection stiffness of the mating position of the first web portion 12 and the second web portion 22, and make the force distribution more reasonable.

[0074] The first tooth-shaped portion 13 is located at the right end of the first web portion 12. To improve the structural strength of the first web portion 12 at the first tooth-shaped portion 13, optionally, please refer to... Figure 4 , Figure 6 and Figure 8 In some embodiments, the first web portion 12 includes a first main body segment 121 and a first reinforcing segment 122 extending along the spanwise direction. The end of the first main body segment 121 near the second blade segment 2 is connected to the end of the first reinforcing segment 122 away from the second blade segment 2. The strength of the first reinforcing segment 122 is greater than that of the first main body segment 121. The first reinforcing segment 122 is provided with a first toothed surface 13.

[0075] Specifically, the first web portion 12 includes a first main body section 121 extending in the left-right direction and a first reinforcing section 122. The right end of the first main body section 121 is connected to the left end of the first reinforcing section 122, and the structural strength of the first reinforcing section 122 is higher than that of the first main body section 121. The first tooth surface 13 is concentrated on the first reinforcing section 122. Through segmented differentiated strength design, the structural performance of the key stress area of ​​tooth meshing (i.e., the first tooth surface 13) is specifically improved, effectively resisting the forces generated by meshing transmission, pre-tightening locking, and complex alternating loads, avoiding deformation, cracking, or wear of the first tooth surface 13, reducing stress concentration, protecting the basic structure of the first main body section 121 from concentrated loads, and strengthening the load-bearing capacity and fatigue resistance of the web meshing position while meeting the overall lightweight design of the wind turbine blade 100. The specific material of the first reinforcing section 122 can be set according to the actual situation. For example, the first reinforcing section 122 can be made of metal or other materials. The following will take the first reinforcing section 122 as an example of a pre-embedded metal part.

[0076] Optionally, please refer to Figure 4 , Figure 5 , Figure 6 and Figure 8In some embodiments, the first main body segment 121 is provided with a first slot 123 on the end face near the second blade segment 2, and the end of the first reinforcing segment 122 away from the second blade segment 2 is wrapped with a first covering layer 124 and inserted into the first slot 123.

[0077] Specifically, a first slot 123 is provided on the right end face of the first main body segment 121, and a first covering layer 124 is provided on the left end of the first reinforcing segment 122. The first covering layer 124 is typically a fiberglass winding layer, and the left end of the first reinforcing segment 122 is pre-embedded in the first slot 123 of the first main body segment 121, achieving a stable insertion combination between the first main body segment 121 and the first reinforcing segment 122. The insertion and mating structure enables rapid and precise alignment and assembly of the first main body segment 121 and the first reinforcing segment 122, with good circumferential and longitudinal limiting effects. The first covering layer 124 can fill the assembly gap, improve the friction and connection tightness of the mating surfaces of the first main body segment 121 and the first reinforcing segment 122, buffer the concentrated stress at the connection position, and avoid wear and cracking caused by hard contact. The first covering layer 124 may include longitudinal fiberglass arranged along the longitudinal direction and / or transverse fiberglass arranged along the thickness direction. The longitudinal and transverse fiberglass can be mixed in a certain proportion and laid in multiple layers. For example, in some embodiments, the first covering layer 124 is mainly composed of transverse glass fibers and a small amount of longitudinal glass fibers.

[0078] The second tooth-shaped portion 23 is located at the left end of the second web portion 22. To improve the structural strength of the second web portion 22 at the second tooth-shaped portion 23, optionally, please refer to... Figure 4 , Figure 6 and Figure 8 In some embodiments, the second web portion 22 includes a second main body segment 221 and a second reinforcing segment 222 extending along the spanwise direction. The end of the second main body segment 221 near the first blade segment 1 is connected to the end of the second reinforcing segment 222 away from the second blade segment 2. The strength of the second reinforcing segment 222 is greater than that of the second main body segment 221. The second reinforcing segment 222 is provided with a second toothed surface 23.

[0079] Specifically, the second web portion 22 includes a second main body section 221 extending in the left-right direction and a second reinforcing section 222. The left end of the second main body section 221 is connected to the right end of the second reinforcing section 222, and the structural strength of the second reinforcing section 222 is higher than that of the second main body section 221. The second tooth surface 23 is concentrated on the second reinforcing section 222. Through segmented differentiated strength design, the structural performance of the key stress area of ​​tooth meshing (i.e., the second tooth surface 23) is specifically improved, effectively resisting the forces generated by meshing transmission, pre-tightening locking, and complex alternating loads, avoiding deformation, cracking, or wear of the second tooth surface 23, reducing stress concentration, and protecting the basic structure of the second main body section 221 from concentrated loads. While meeting the overall lightweight design of the wind turbine blade 100, it strengthens the load-bearing capacity and fatigue resistance of the web mating meshing position. The specific material of the second reinforcing section 222 can be set according to the actual situation. For example, the second reinforcing section 222 can be made of metal or other materials. The following will introduce the second reinforcing section 222 as an example of a pre-embedded metal part.

[0080] Optionally, please refer to Figure 4 , Figure 5 , Figure 6 and Figure 8 In some embodiments, the second main body segment 221 is provided with a second slot 223 on the end face near the first blade segment 1, and the end of the second reinforcing segment 222 away from the first blade segment 1 is wrapped with a second covering layer 224 and inserted into the second slot 223.

[0081] Specifically, the left end face of the second main body segment 221 is provided with a second slot 223, and the right end of the second reinforcing segment 222 is covered with a second covering layer 224. The second covering layer 224 is typically a fiberglass winding layer, and the right end of the second reinforcing segment 222 is pre-embedded in the second slot 223 of the second main body segment 221, realizing a stable insertion combination of the second main body segment 221 and the second reinforcing segment 222. The insertion and mating structure enables the second main body segment 221 and the second reinforcing segment 222 to be quickly and accurately aligned and assembled, with good circumferential and longitudinal limiting effects. The second covering layer 224 can fill the assembly gap, improve the friction and connection tightness of the mating surfaces of the second main body segment 221 and the second reinforcing segment 222, buffer the concentrated stress at the connection position, and avoid wear and cracking caused by hard contact. The second covering layer 224 may include longitudinal fiberglass arranged along the longitudinal direction and / or transverse fiberglass arranged along the thickness direction. The longitudinal and transverse fiberglass can be mixed in a certain proportion and laid in multiple layers. For example, in some embodiments, the second covering layer 224 is mainly composed of transverse glass fibers and a small amount of longitudinal glass fibers.

[0082] One or more webs may be provided within the fan blade 100. Correspondingly, one or more first web portions 12 may be provided within the first blade segment 1, and one or more second web portions 22 may be provided within the second blade segment 2. Optionally, please refer to... Figures 1 to 3 In some embodiments, multiple first web portions 12 and second web portions 22 are provided at intervals along the chord direction of the fan blade 100, and each first web portion 12 is connected to a second web portion 22 by a meshing member 32.

[0083] Specifically, multiple first web portions 12 and multiple second web portions 22 are provided, with each first web portion 12 corresponding to a corresponding second web portion 22. Each first web portion 12 is connected to a corresponding second web portion 22 via a meshing member 32. The multiple first web portions 12 include a first large web portion 12a and a first small web portion 12b. The first large web portion 12a is larger than the first small web portion 12b in the thickness direction of the fan blade 100. The first main body section 121 and the first reinforcing section 122 of the first large web portion 12a are the first large main body section 121a and the first large reinforcing section 122a, respectively. The first main body section 121 and the first reinforcing section 122 of the first small web portion 12b are the first large main body section 121b and the first small reinforcing section 122b, respectively.

[0084] The plurality of second web portions 22 include a second large web portion 22a and a second small web portion 22b. The second large web portion 22a is larger than the second small web portion 22b in the thickness direction of the fan blade 100. The second main body section 221 and the second reinforcing section 222 of the second large web portion 22a are the second large main body section 221a and the second large reinforcing section 222a, respectively. The second main body section 221 and the second reinforcing section 222 of the second small web portion 22b are the second large main body section 221b and the second small reinforcing section 222b, respectively.

[0085] The meshing component 32 includes a large meshing component 32c and a small meshing component 32d. The large meshing component 32c is larger than the small meshing component 32d in the thickness direction of the wind turbine blade 100. The first large web portion 12a and the second large web portion 22a are connected by the large meshing component 32c, and the first small web portion 12b and the second small web portion 22b are connected by the small meshing component 32d. The number and installation position of the first large web portion 12a, the first small web portion 12b, the second large web portion 22a, and the second small web portion 22b can be optimized by combining the actual load conditions of the wind turbine blade 100 and by computer finite element simulation analysis. This ensures that the web layout and load distribution are precisely matched, meeting the structural strength and load-bearing requirements while also achieving overall lightweighting and improving the rationality and adaptability of the segmented blade connection structure.

[0086] The wind turbine blade 100 adopts a segmented blade connection structure based on toothed meshing embedded structural components. The overall structure is simple, the connection is reliable, and maintenance-free, while effectively reducing the manufacturing, transportation, and assembly costs of the wind turbine blade 100. Compared with existing segmented blade connection technologies, the wind turbine blade 100 has the following advantages.

[0087] 1. The number and installation position of the web (i.e., the first web section 12 or the second web section 22) can be flexibly and reasonably arranged according to the load-bearing requirements and lightweight design requirements of the segmented docking positions of the wind turbine blades 100, resulting in stronger structural adaptability.

[0088] 2. The tooth meshing structure of the wind turbine blade 100 adopts a trapezoidal tooth structure design, which effectively improves the pull-out resistance of the embedded components (i.e., the first reinforcing section 122 or the second reinforcing section 222); the web of the wind turbine blade 100 achieves docking and matching through the tooth meshing structure, with good overall connection and stable stress, which can meet the requirements of large load bearing.

[0089] 3. The tooth meshing structure of the wind turbine blade 100 is initially pre-tightened with bolts 41, and a high-strength composite material winding layer 35 is wound around the outside of the tooth meshing structure. During the assembly stage, the bolts 41 provide the initial pre-tightening force. During the long-term operation of the wind turbine blade 100, even if the pre-tightening force of the bolts 41 decreases, the composite material winding layer 35 can still continuously provide a stable pre-tightening effect to compensate for the loss of pre-tightening force, ultimately achieving the requirement of maintenance-free use of the bolts 41.

[0090] The present invention also provides a wind turbine generator set, which includes wind turbine blades. Since the wind turbine blades adopt the technical solutions of the above embodiments, they have the beneficial effects brought about by the technical solutions of the above embodiments.

[0091] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A wind turbine blade, c h a r a c t e r i s e d in that include: The first blade segment extends along the span of the wind turbine blade and includes a connected first housing portion and a first web portion, with at least a portion of the first web portion located within the first housing portion. The second blade segment is arranged at intervals with the first blade segment in the spanwise direction. The second blade segment extends along the spanwise direction and includes a connected second shell portion and a second web portion. At least a portion of the second web portion is located within the second shell portion. A blade connecting section is located between the first blade segment and the second blade segment. The blade connecting section extends along the spanwise direction. The blade connecting section includes a third housing portion and a meshing member. The two ends of the third housing portion are respectively connected to the first housing portion and the second housing portion. At least a portion of the meshing member is located inside the third housing portion. The two ends of the meshing member are respectively connected to the first web portion and the second web portion. The first web portion, the second web portion, and the meshing member are respectively provided with a first toothed surface, a second toothed surface, and a third toothed surface. The portion of the third toothed surface near the first web portion meshes with the first toothed surface, and the portion of the third toothed surface near the second web portion meshes with the second toothed surface.

2. The wind turbine blade according to claim 1, characterized in that, The first web portion and the second web portion are connected by two meshing members arranged at intervals along the chord direction of the fan blade, with the first web portion and the second web portion located between the two meshing members.

3. The wind turbine blade according to claim 2, characterized in that, Both the first web portion and the second web portion are connected to the two meshing members via screw connections. The first web portion, the second web portion, and the meshing members are respectively provided with a first through hole, a second through hole, and a third through hole along the chord direction for the screw connections to pass through; and / or, The first tooth surface, the second tooth surface, and the third tooth surface each include a plurality of first convex teeth, a plurality of second convex teeth, and a plurality of third convex teeth. The plurality of first convex teeth are arranged at intervals in the spanwise direction. A first tooth groove is formed between two adjacent first convex teeth to accommodate the third convex tooth. A second tooth groove is formed between two adjacent second convex teeth to accommodate the third convex tooth. A third tooth groove is formed between two adjacent third convex teeth to accommodate either the first convex tooth or the second convex tooth.

4. The wind turbine blade according to claim 3, characterized in that, The first perforation is located at the first tooth groove, the second perforation is located at the second tooth groove, and the third perforation is located at the third protruding tooth.

5. A wind turbine blade according to claim 3 or 4, wherein The third through hole includes a first countersunk hole and a second countersunk hole respectively provided in the two meshing parts. The screw connection includes a threaded bolt and a nut. The head of the bolt is located in the first countersunk hole, and the tail of the bolt and the nut are located in the second countersunk hole.

6. The wind turbine blade of claim 3, wherein, Both the first web portion and the second web portion are connected to the two meshing members by multiple rows of threaded members spaced apart in the span direction, each row of threaded members including multiple threaded members spaced apart along the extension direction of the third tooth groove.

7. The wind turbine blade of claim 3, wherein, The first convex tooth, the second convex tooth, and the third convex tooth are all extended along the thickness direction of the fan blade.

8. The wind turbine blade of claim 3, wherein, The first convex tooth, the second convex tooth, and the third convex tooth are all trapezoidal convex teeth.

9. The wind turbine blade according to claim 2 or 3, wherein The two meshing parts are wrapped with a winding layer at the connection positions with the first web portion and the second web portion.

10. The wind turbine blade of claim 1, wherein, The end of the first web portion near the second blade segment and the end of the second web portion near the first blade segment are both located within the third housing portion; and / or, The first web portion near the end face of the meshing member is connected to the second web portion near the end face of the meshing member.

11. The wind turbine blade of claim 1, wherein, The first web portion includes a first main body segment and a first reinforcing segment extending along the spanwise direction. The end of the first main body segment near the second blade segment is connected to the end of the first reinforcing segment away from the second blade segment. The strength of the first reinforcing segment is greater than that of the first main body segment. The first reinforcing segment is provided with the first tooth-like surface; and / or, The second web portion includes a second main body segment and a second reinforcing segment extending along the spanwise direction. The end of the second main body segment near the first blade segment is connected to the end of the second reinforcing segment away from the second blade segment. The strength of the second reinforcing segment is greater than that of the second main body segment. The second reinforcing segment is provided with a second toothed surface.

12. The wind turbine blade of claim 11, wherein, The first main body segment has a first slot on its end face near the second blade segment, and the end of the first reinforcing segment away from the second blade segment is wrapped with a first covering layer and inserted into the first slot.

13. The wind turbine blade of claim 11, wherein, The second main body segment has a second slot on its end face near the first blade segment, and the end of the second reinforcing segment away from the first blade segment is wrapped with a second covering layer and inserted into the second slot.

14. The wind turbine blade of claim 1, wherein, The wind turbine blades must meet at least one of the following conditions: Both the first web portion and the second web portion are provided in multiples at intervals along the chord direction of the fan blade, and each first web portion is connected to a second web portion through the meshing member; The first housing portion and the third housing portion are bonded together with adhesive. A first stop structure is provided between the first housing portion and the third housing portion; The second housing portion and the third housing portion are bonded together with adhesive. A second stop structure is provided between the second housing portion and the third housing portion.

15. A wind turbine generator set, characterized in that, Including the wind turbine blades as described in any one of claims 1-14.

Images