Wind turbine generator blade main beam structure and wind turbine generator
By introducing a transition section and a beveled clip-on structure into the main beam of a wind turbine blade, the problems of difficult positioning and stress concentration are solved, efficient positioning and stress dispersion are achieved, and the overall performance and production efficiency of the blade are improved.
Patent Information
- Application Number
- CN202511053850.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-29
- Publication Date
- 2025-09-16
AI Technical Summary
The existing pultruded main beam structure of wind turbine blades is prone to positioning deviation and stepped structure during stacking, which leads to stress concentration and affects blade performance and production quality.
The design adopts a main section and a transition section. One side of the transition section is a sloped structure, which can achieve rapid positioning through the clamping parts, avoid the step structure, and use the slope to disperse the stress.
The positioning accuracy and reliability of the blade main beam are improved, stress concentration is reduced, and overall performance and production efficiency are improved.
Smart Images
Figure CN120650115A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of wind turbines, and in particular to a wind turbine blade main beam structure and a wind turbine. Background Art
[0002] The wind power industry is currently developing towards larger and more offshore wind turbines. As a key component of wind turbines, wind turbine blades' performance directly impacts power generation efficiency. The main beam, the core structure of wind turbine blades, plays a crucial role in their strength and stability.
[0003] In existing technology, some wind turbine blades utilize a pultruded main beam structure. While this structure offers advantages such as reduced blade weight, increased overall rigidity, and faster production, the pultruded main beam requires spanwise repositioning for each stacked layer, which can easily lead to deviations and misalignment of the pultruded sheets, impacting blade production quality. Furthermore, to accommodate the blade's shape, each layer of pultruded sheet typically varies in spanwise dimensions. After stacking, this typically creates a stepped structure with varying thicknesses along the spanwise direction. This stepped structure can easily lead to stress concentration, which in turn affects the overall performance of the blade. Summary of the Invention
[0004] In order to solve at least one of the problems mentioned in the background technology, the present application provides a wind turbine blade main beam structure and a wind turbine, which are easy to position and have low stress concentration.
[0005] In order to achieve the above objectives, this application provides the following technical solutions:
[0006] In a first aspect, the present application provides a main beam structure for a wind turbine blade, comprising a main section and a transition section spliced along the span direction of the blade, wherein the main section comprises a plurality of pultruded plate groups stacked along the thickness direction, and the pultruded plate group comprises a plurality of pultruded plates spliced along the chord direction of the blade;
[0007] The thickness of the side where the transition section and the main section are joined is greater than or equal to the thickness of the main section, and the side of the transition section facing away from the main section is constructed as a first inclined surface;
[0008] One side where the pultruded plate and the transition section are spliced has a first clamping portion, and one side where the transition section and the pultruded plate are spliced has a second clamping portion, and the first clamping portion and the second clamping portion are clamped together.
[0009] As an optional embodiment, the transition section includes at least two transition layers stacked along the thickness direction, the transition layer has a second inclined surface on a side facing away from the pultruded plate, and at least two second inclined surfaces are spliced to form the first inclined surface.
[0010] As an optional embodiment, the joint surfaces of two adjacent transition layers along the thickness direction of the transition section have a mutually clamping structure.
[0011] As an optional embodiment, the transition layer includes at least two transition plates spliced together along the chord direction, the side of the transition plate facing away from the pultruded plate has a third inclined surface, and at least two third inclined surfaces are spliced along the chord direction to form a second inclined surface.
[0012] As an optional implementation, the first clamping portion is a recessed structure, and the second clamping portion is a raised structure; or the first clamping portion is a raised structure, and the second clamping portion is a recessed structure.
[0013] As an optional implementation, the first inclined surface is a plane, and the angle between the first inclined surface and the bottom surface of the transition section is greater than or equal to 15° and less than or equal to 45°.
[0014] As an optional implementation, the first inclined surface is a curved surface structure.
[0015] As an optional implementation, the cross-section of the transition section along the span direction is a right trapezoid or a right triangle.
[0016] As an optional embodiment, one fifth of the span-wise length of the main body segment is greater than the span-wise length of the transition segment.
[0017] In a second aspect, the present application further provides a wind turbine generator set, comprising the wind turbine generator set blade main beam structure in the first aspect.
[0018] The wind turbine blade main beam structure provided in the present application includes a main section and a transition section spliced along the span direction of the blade, the main section includes a plurality of pultruded plate groups stacked along the thickness direction, and the pultruded plate group includes multiple pultruded plates spliced along the chord direction of the blade; the thickness of the side where the transition section and the main section are spliced is greater than or equal to the thickness of the main section, and the side of the transition section facing away from the main section is constructed as a first inclined surface; the side where the pultruded plate and the transition section are spliced has a first clamping portion, and the side where the transition section and the pultruded plate are spliced has a second clamping portion, and the first clamping portion and the second clamping portion are clamped together.
[0019] The main beam structure of the wind turbine blade provided by the present application is achieved by dividing the main beam structure into a main section and a transition section, and setting the side of the transition section away from the main section into an inclined structure. When installing the main beam structure, the transition section can be installed in the blade first, and then the pultruded plates that make up the main section can be spliced with the transition section one by one. During splicing, the first clamping part on the pultruded plate and the second clamping part on the transition section can be clamped together, so as to quickly perform positioning, avoiding the problem of difficult positioning in the prior art. At the same time, by designing one side of the transition section into an inclined structure, it can not only meet the requirements of the blade shape, but also avoid the generation of step structures between the main beams of each layer, effectively reducing stress concentration and improving the reliability of the main beam structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0021] Figure 1 A schematic diagram of a wind turbine blade main beam structure in the prior art;
[0022] Figure 2 A schematic diagram of a wind turbine blade main beam structure provided in an embodiment of the present application;
[0023] Figure 3 A first schematic diagram of a transition section in a main beam structure of a wind turbine blade provided by an embodiment of the present application;
[0024] Figure 4 A second schematic diagram of a transition section in a main beam structure of a wind turbine blade provided in an embodiment of the present application;
[0025] Figure 5 This is a third schematic diagram of the transition section in the main beam structure of a wind turbine blade provided in an embodiment of the present application.
[0026] Description of reference numerals:
[0027] 100-main beam structure;
[0028] 110-main body segment;
[0029] 111-pultruded board;
[0030] 1111-first clamping portion;
[0031] 120-transition section;
[0032] 121- first inclined surface;
[0033] 122-transition layer;
[0034] 123-transition plate;
[0035] 124-Second slope;
[0036] 125-third slope;
[0037] 126-Second clamping portion. DETAILED DESCRIPTION
[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0039] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.
[0040] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0041] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0042] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.
[0043] In the existing technology, some wind turbine blades use a pultruded main beam structure. Although this structure has the advantages of reducing blade weight, improving overall rigidity and accelerating production speed, the pultruded main beam needs to be repositioned in the span direction when each layer is stacked, which is prone to deviation, resulting in misalignment of the pultruded plate and affecting the production quality of the blade. Figure 1 As shown in the figure, in order to adapt to the shape of the blade, the span-wise dimensions of each layer of pultruded plate are generally different. After stacking, a step-like structure with different thicknesses will generally appear along the span-wise direction. This step-like structure can easily lead to stress concentration, thereby affecting the overall performance of the blade.
[0044] In view of this, the present application provides a main beam structure for a wind turbine blade, comprising a main body section and a transition section spliced along the span direction of the blade, the main body section comprising a plurality of pultruded plates stacked in the thickness direction, the pultruded plates comprising a plurality of pultruded plates spliced along the chord direction of the blade; the thickness of the side where the transition section and the main body section are spliced is greater than or equal to the thickness of the main body section, and the side of the transition section facing away from the main body section is constructed as a first inclined surface; the side where the pultruded plates and the transition section are spliced has a first clamping portion, and the side where the transition section and the pultruded plates are spliced has a second clamping portion, the first clamping portion and the second clamping portion being clamped together. By dividing the main beam structure into the main body section and the transition section, when installing the main beam structure, the transition section can be first installed in the blade, and then the pultruded plates constituting the main body section can be spliced one by one with the transition section. During splicing, the first clamping portion on the pultruded plate and the second clamping portion on the transition section can be clamped together, thereby quickly positioning the blade, avoiding the positioning difficulty problem in the prior art. At the same time, by designing one side of the transition section into a sloped structure, it can not only meet the requirements of the blade shape, but also avoid the formation of step structures between the main beams of each layer, effectively reducing stress concentration and improving the reliability of the main beam structure.
[0045] Figure 1 A schematic diagram of a wind turbine blade main beam structure in the prior art; Figure 2 A schematic diagram of a wind turbine blade main beam structure provided in an embodiment of the present application; Figure 3 A first schematic diagram of a transition section in a main beam structure of a wind turbine blade provided by an embodiment of the present application; Figure 4 A second schematic diagram of a transition section in a main beam structure of a wind turbine blade provided in an embodiment of the present application; Figure 5 This is a third schematic diagram of the transition section in the main beam structure of a wind turbine blade provided in an embodiment of the present application.
[0046] You can refer to Figures 1 to 5 An embodiment of the present application provides a wind turbine blade main beam structure 100, comprising a main section 110 and a transition section 120 spliced along the span direction of the blade, the main section 110 comprising a plurality of pultruded plates 111 stacked in a thickness direction, the pultruded plates 111 comprising a plurality of pultruded plates 111 spliced along the chord direction of the blade; the thickness of a side where the transition section 120 and the main section 110 are spliced is greater than or equal to the thickness of the main section 110, and a side of the transition section 120 facing away from the main section 110 is constructed as a first inclined surface 121; a first clamping portion 1111 is provided on a side where the pultruded plates 111 and the transition section 120 are spliced, and a second clamping portion 126 is provided on a side where the transition section 120 and the pultruded plates 111 are spliced, and the first clamping portion 1111 and the second clamping portion 126 are clamped together.
[0047] The wind turbine blade main beam structure 100 provided in the embodiment of the present application is achieved by dividing the main beam structure 100 into a main section 110 and a transition section 120, and setting the side of the transition section 120 away from the main section 110 into an inclined structure. When installing the main beam structure 100, the transition section 120 can be installed in the blade first, and then the pultruded plates 111 constituting the main section 110 can be spliced with the transition section 120 one by one. During the splicing, the first clamping portion 1111 on the pultruded plate 111 and the second clamping portion 126 on the transition section 120 can be clamped together, thereby quickly positioning, avoiding the problem of difficult positioning in the prior art. At the same time, by designing one side of the transition section 120 into an inclined structure, it can not only meet the requirements of the blade shape, but also avoid the generation of a step structure between the main beams of each layer, effectively reducing stress concentration and improving the reliability of the main beam structure 100.
[0048] In the above embodiment, the transition section 120 comprises at least two transition layers 122 stacked along the thickness direction. The side of the transition layer 122 facing away from the pultruded sheet 111 has a second inclined surface 124. At least two second inclined surfaces 124 are joined to form the first inclined surface 121. This design improves structural adaptability and allows for flexible adaptation to varying blade sizes. Specifically, since the number of pultruded sheet 111 layers required for wind turbine blade main beams varies, adjusting the number and combination of transition layers 122 allows for convenient adaptation to main sections 110 of varying thicknesses. For example, when the main section 110 includes five layers of pultruded plates 111, a transition layer 122 with a thickness of one layer of two layers of pultruded plates 111 and a transition layer 122 with a thickness of one layer of three layers of pultruded plates 111 can be processed, and the two can be stacked to form a transition section 120 with a thickness of five layers of pultruded plates 111, and then the transition section 120 and the pultruded plates 111 in the main section 110 are spliced one by one; if the main section 110 only requires three layers of pultruded plates 111, a transition layer 122 with a thickness of three layers can be used alone, which effectively improves the versatility of the component and the flexibility of production applications. Secondly, in terms of adapting to complex blade shapes, the design decomposes the complex overall inclined surface into multiple simple local inclined surfaces, reducing the processing difficulty of each transition layer 122, and can flexibly adapt to different blade shape requirements by adjusting the size and angle of each transition layer 122, thereby ensuring the accuracy of the inclined surface and the blade while reducing the processing threshold and production cost.
[0049] In the above embodiment, the splicing surfaces of the two transition layers 122 adjacent along the thickness direction of the transition section 120 have a mutually snap-fitting structure. This snap-fitting structure (such as protrusions and grooves, mortise and tenon structures, etc.) can enable the adjacent transition layers 122 to precisely engage when splicing, effectively avoiding relative sliding or misalignment between layers. This is crucial for the blade to withstand alternating loads (such as wind impact, vibration, etc.) during operation. It can ensure that the transition section 120 is coordinated as a whole structure to bear the force, reducing local stress concentration caused by looseness between layers; at the same time, the snap-fitting structure itself has a positioning function. When the transition layers 122 are stacked and assembled, they can be quickly aligned without additional measurement or auxiliary tools, reducing assembly errors and further improving the assembly efficiency and accuracy of the entire main beam structure 100.
[0050] In the above embodiment, the transition layer 122 comprises at least two transition plates 123 joined together along the chordwise direction. The sides of the transition plates 123 facing away from the pultruded plate 111 have third inclined surfaces 125. The at least two third inclined surfaces 125 are joined along the chordwise direction to form a second inclined surface 124. By joining the transition plates 123 along the chordwise direction, the number of transition plates 123 or the size of each transition plate 123 can be adjusted to meet the varying chordwise dimensions of the main section 110. This allows the transition layer 122 to more precisely match the chordwise dimensional variations of the main section 110. This is particularly suitable for large blades with large chordwise dimensions or complex shapes. Furthermore, the design of joining the third inclined surfaces 125 to form the second inclined surface 124 simplifies the processing of a single transition plate 123 to processing smaller third inclined surfaces 125, reducing the processing difficulty and precision requirements for a single component. Even if the blade has subtle curvatures or gradual changes in the chordwise shape, the blade can adapt to these changes by fine-tuning the angles of each third inclined surface 125, thereby enhancing the overall structure's adaptability to complex shapes. Furthermore, the small transition plate 123 is easier to manufacture, transport, and handle, particularly in large blade production, eliminating the processing and handling challenges associated with the oversized integral transition layer 122. During assembly, the transition plates 123 can be joined piece by piece to achieve layered assembly. Combined with positioning methods such as snap-fit structures, this further improves the assembly precision of the transition layer 122, reduces assembly deviations caused by overall machining errors, and enhances the production reliability of the transition section 120 and, ultimately, the entire main beam structure 100.
[0051] In the above embodiment, the first clamping portion 1111 is a recessed structure, and the second clamping portion 126 is a raised structure, or the first clamping portion 1111 is a raised structure, and the second clamping portion 126 is a recessed structure. It can be understood that the mechanical engagement of the projection and the recess has a clear geometric constraint relationship, which can quickly achieve precise alignment of the pultruded plate 111 and the transition section 120 during splicing, avoiding offset along the chord or thickness direction, solving the problem of deviation easily generated by traditional layer-by-layer positioning, ensuring the relative position accuracy of each layer of pultruded plate 111, and thus improving the overall consistency of the main beam structure 100. In addition, this type of clamping does not require reliance on complex measuring tools or auxiliary positioning devices, and the initial fixation can be completed only through the natural interlocking of the projection and the recess, which simplifies the assembly process. In particular, in the multi-level splicing of large blade main beams, it can significantly shorten the installation time and improve production efficiency. In addition, the protrusions and depressions after interlocking can form a mechanical lock, thereby enhancing the connection strength between the pultruded plate 111 and the transition section 120. When the blade is subjected to wind loads, vibrations and other working conditions, the relative displacement of the splicing parts is reduced, local stress concentration caused by looseness is avoided, and the mechanical stability of the main beam structure 100 is further ensured.
[0052] In the above embodiment, the first bevel 121 is a plane, and the angle between the first bevel 121 and the bottom surface of the transition section 120 is greater than or equal to 15° and less than or equal to 45°. It is understood that if this angle is too small, the transition of the first bevel 121 will be too gentle, and when processing the transition plate 123 to form this first bevel 121, a large amount of material will need to be removed, which may have a significant impact on the structure of the transition section 120. When this angle is too large, the transition of the first bevel 121 is too rapid, which is prone to stress concentration and cannot effectively reduce stress. Setting this angle between 15° and 45° can ensure that the transition plate 123 achieves a relatively reasonable amount of material removal while meeting the structural strength requirements, while also ensuring that the bevel transition is sufficiently gentle, effectively dispersing stress, reducing the risk of stress concentration, and ensuring the stability and reliability of the main beam structure 100.
[0053] In the above embodiment, the first inclined surface 121 is a curved surface. As will be appreciated, a curved surface provides a smoother transition. When the blade is subjected to wind loads, stress is gradually transferred and released along the curvature of the curved surface, avoiding localized stress accumulation and further reducing the risk of stress concentration. This is particularly useful in scenarios where the blade's curvature varies complexly or the load is unevenly distributed. In some scenarios, a curved surface structure can more precisely conform to the blade's internal aerodynamic shape. To optimize aerodynamic performance, some wind turbine blades may have curved inner walls. In this case, the curved first inclined surface 121 can form a closer fit with the blade shell, reducing structural redundancy caused by gaps and improving the overall force-bearing coordination between the main beam and the blade. Furthermore, a curved surface structure offers more efficient material utilization. The curved transition avoids the possibility of localized thinning when cutting the first inclined surface 121. While maintaining the structural strength of the transition section 120, it also achieves efficient material distribution, balancing lightweighting with mechanical performance.
[0054] In the above embodiment, the cross-section of the transition section 120 along the span direction is a right-angled trapezoid or a right-angled triangle. When the cross-section of the transition section 120 along the span direction is a right-angled trapezoid, the right-angled side on one side can form a straight docking surface with the main section 110, ensuring thickness adaptation and stable connection with the main section 110; the hypotenuse on the other side naturally forms the first bevel 121, which can not only meet the transition requirements of the blade shape, but also control the flatness of the bevel through the waist length of the trapezoid, balancing stress dispersion and material utilization efficiency. At the same time, the difference between the upper and lower bases of the trapezoid can flexibly adapt to the size difference between the main section 110 and the blade shell, enhancing the adaptability of the structure. When the cross-section of the transition section 120 along the span direction is a right-angled triangle, its right-angled side can be used as a connection reference plane with the main section 110 to ensure the verticality and stability of the splicing; the hypotenuse directly forms the first bevel 121, which has a simpler structural form and is less difficult to process. This design is suitable for scenarios where the transition requirements between the thickness of the main section 110 and the blade shell are relatively simple. The right-angle characteristics of the triangle ensure direct force transmission and reduce structural redundancy.
[0055] Both cross-sectional shapes provide a stable connection reference with right-angled sides, and the beveled sides form a transition slope. While ensuring a smooth transition between the main section 110 and the blade shell, it simplifies the processing and assembly process of the transition section 120, ensures that stress is evenly transferred along the bevel, and improves the reliability of the main beam structure 100.
[0056] In the above embodiment, one-fifth of the spanwise length of the main section 110 is greater than the spanwise length of the transition section 120. It is understood that the main section 110, as the core load-bearing portion of the main beam, needs to have sufficient spanwise length to bear the primary load during blade operation, while the core function of the transition section 120 is to achieve a smooth transition between the main section 110 and the blade shape and to assist in positioning, without requiring an excessive spanwise extension. By limiting the spanwise length of the transition section 120 to less than one-fifth of the spanwise length of the main section 110, it is ensured that the main section 110 occupies a dominant position in the overall structure, ensuring that the core load-bearing capacity of the main beam is not excessively affected by the size of the transition section 120. Furthermore, by making the length of the transition section 120 less than one-fifth of the length of the main section 110, the joint point between the transition section 120 and the main section 110 can be closer to the edge of the blade's extension direction, making it easier to join and position the transition section 120 and the main section 110. For example, the span length of the main section 110 of a blade main beam can be 50 meters, and the length of the transition section 120 can be 5 meters. In this way, the splicing point can be closer to the edge of the blade, making it more convenient for workers to operate during assembly.
[0057] In one application scenario, the main section 110 of a wind turbine blade's main beam comprises five layers of pultruded panels 111, each of which is composed of five panels 111 spliced together along the chordal direction. During splicing, the panels 111 are closely spaced, with adhesive and specific mechanical fixings ensuring a secure connection. The transition section 120 is a monolithic structure with the thickness of five layers of pultruded panels 111. Its first inclined surface 121 is designed as a plane, with a 30° angle between the first inclined surface 121 and the bottom surface. This angle effectively disperses stress and ensures structural transition. A groove structure is provided on the transition plate 123, and a protrusion structure is provided on one side of the pultruded panel 111. The groove and protrusion structures interlock to ensure precise positioning and a secure connection between the transition section 120 and the main section 110 during splicing. This design ensures efficient assembly while ensuring strength, enabling stable blade operation under varying wind conditions.
[0058] In addition, an embodiment of the present application also provides a wind turbine generator set, including the wind turbine generator blade main beam structure 100 in the above embodiment, wherein the wind turbine generator blade main beam structure 100 includes a main section 110 and a transition section 120 spliced along the span direction of the blade, the main section 110 includes a group of pultruded plates 111 stacked in a thickness direction, and the pultruded plate 111 group includes multiple pultruded plates 111 spliced along the chord direction of the blade; the thickness of the side where the transition section 120 and the main section 110 are spliced is greater than or equal to the thickness of the main section 110, and the side of the transition section 120 facing away from the main section 110 is constructed as a first inclined surface 121; the side where the pultruded plate 111 and the transition section 120 are spliced has a first clamping portion 1111, and the side where the transition section 120 and the pultruded plate 111 are spliced has a second clamping portion 126, and the first clamping portion 1111 and the second clamping portion 126 are clamped together. By dividing the main beam structure 100 into a main section 110 and a transition section 120, when installing the main beam structure 100, the transition section 120 can be installed in the blade first, and then the pultruded plates 111 that make up the main section 110 can be spliced with the transition section 120 one by one. During the splicing, the first clamping portion 1111 on the pultruded plate 111 and the second clamping portion 126 on the transition section 120 can be clamped together, thereby quickly positioning the blade and avoiding the positioning difficulties in the prior art. At the same time, by designing one side of the transition section 120 into a sloped structure, it can meet the requirements of the blade shape and avoid the formation of a step structure between the main beam layers, effectively reducing stress concentration and thus improving the reliability of the wind turbine structure.
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A wind turbine blade main beam structure (100), characterized in that: It comprises a main section (110) and a transition section (120) spliced along the span direction of the blade, the main section (110) comprising a plurality of pultruded plates (111) stacked in a thickness direction, the pultruded plate (111) group comprising a plurality of pultruded plates (111) spliced along the chord direction of the blade; The thickness of a side where the transition section (120) and the main section (110) are joined is greater than or equal to the thickness of the main section (110), and a side of the transition section (120) facing away from the main section (110) is constructed as a first inclined surface (121); The side where the pultruded plate (111) and the transition section (120) are spliced together has a first clamping portion (1111), and the side where the transition section (120) and the pultruded plate (111) are spliced together has a second clamping portion (126), and the first clamping portion (1111) and the second clamping portion (126) are clamped together.
2. The wind turbine blade main beam structure (100) according to claim 1, characterized in that: The transition section (120) includes at least two transition layers (122) stacked in a thickness direction, the transition layer (122) has a second inclined surface (124) on a side facing away from the pultruded plate (111), and at least two of the second inclined surfaces (124) are spliced to form the first inclined surface (121).
3. The wind turbine blade main beam structure (100) according to claim 2, characterized in that: The joint surfaces of the two transition layers (122) adjacent to each other along the thickness direction of the transition section (120) have a mutually engaged clamping structure.
4. The wind turbine blade main beam structure (100) according to claim 3, characterized in that: The transition layer (122) includes at least two transition plates (123) spliced together along the chord direction, the side of the transition plate (123) facing away from the pultruded plate (111) has a third inclined surface (125), and at least two of the third inclined surfaces (125) are spliced along the chord direction to form the second inclined surface (124).
5. The wind turbine blade main beam structure (100) according to any one of claims 1 to 4, characterized in that: The first clamping portion (1111) is a recessed structure, and the second clamping portion (126) is a raised structure; alternatively, the first clamping portion (1111) is a raised structure, and the second clamping portion (126) is a recessed structure.
6. The wind turbine blade main beam structure (100) according to any one of claims 1 to 4, characterized in that: The first inclined surface (121) is a plane, and the angle between the first inclined surface (121) and the bottom surface of the transition section (120) is greater than or equal to 15° and less than or equal to 45°.
7. The wind turbine blade main beam structure (100) according to any one of claims 1 to 4, characterized in that: The first inclined surface (121) is a curved surface structure.
8. The wind turbine blade main beam structure (100) according to any one of claims 1 to 4, characterized in that: The cross section of the transition section (120) along the span direction is a right-angled trapezoid or a right-angled triangle.
9. The wind turbine blade main beam structure (100) according to any one of claims 1 to 4, characterized in that: One fifth of the spanwise length of the main body section (110) is greater than the spanwise length of the transition section (120).
10. A wind turbine generator system, characterized in that: The invention comprises the wind turbine blade main beam structure (100) as described in any one of claims 1 to 9.