Large wind turbine generator blade with hollow pultrusion plate main beam structure
By adopting hollow pultrusion plate main beam structure and combined stacking method, the bending instability of the main beam of the blade of a large wind turbine is solved, and the effect of weight reduction and cost reduction is achieved.
Patent Information
- Application Number
- CN202420592105.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-03-25
AI Technical Summary
The blades of large wind turbines are prone to buckling instability of the main beam and web under waving loads. Existing methods such as thickening the main beam and reinforcing the edge core material cannot effectively control costs.
The main beam structure of the hollow pultrusion plate is adopted, and multiple hollow pultrusion plates are stacked and filled with cured materials in sequence, and combined with the combined stacking method of solid pultrusion plates and hollow pultrusion plates to form the main beam structure.
While thickening the main beam and solving the buckling of the main beam edge, it reduces the weight gain of the main beam, improves material utilization, and effectively controls the cost of the blade.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind power generation, in particular to a large-scale wind turbine blade with a hollow pultruded plate main beam structure. Background Art
[0002] In recent years, blades have been continuously developed in the direction of large-scale, and with it comes the frequent instability of blades. The buckling of the main beam edge and the core material of the main beam edge is a common phenomenon of instability in the swinging direction of large wind turbine blades. At present, this problem is solved by thickening the main beam and strengthening the core material of the main beam edge, but the weight increase is much, which cannot achieve the current expected target of blade weight, and thus cannot effectively control the production cost of wind turbine blades.
[0003] As the size of the blade increases, the load on the blade also increases. The main beam and web, as key components of the blade, play a major role in bearing. Under the swinging load, the I-beam system formed by the main beam and web is bent, and the buckling of the main beam edge and the core material of the main beam edge is the buckling of the compressed flange of the bent I-beam. The most direct and effective solution is to thicken the main beam, but thickening the main beam will increase the weight of the main beam, and the ultimate bearing capacity of the main beam will be greatly surplus, which is not conducive to the cost control of the blade. Utility Model Content
[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and propose a large wind turbine blade with a hollow pultruded plate main beam structure. The hollow structure of the main beam is used to increase the thickness of the main beam, solve the flange buckling, reduce the weight of the main beam, improve the utilization rate of the main beam material, and effectively control the cost of the blade.
[0005] To achieve the above-mentioned purpose, the technical solution provided by the utility model is: a large wind turbine blade with a hollow pultruded plate main beam structure, including a blade body, wherein the pressure surface main beam and the suction surface main beam of the blade body both adopt a hollow pultruded plate main beam structure or one of them adopts a hollow pultruded plate main beam structure.
[0006] Preferably, the hollow pultruded plate main beam structure is formed by stacking a plurality of hollow pultruded plates in sequence.
[0007] Preferably, an installation gap is provided between any adjacent hollow pultruded plates for filling with curing material.
[0008] Preferably, the hollow pultruded plate main beam structure is formed by stacking a solid pultruded plate and a hollow pultruded plate.
[0009] Preferably, the combined stacking is a staggered stacking of solid pultruded plates and hollow pultruded plates in sequence, or a plurality of sequentially stacked solid pultruded plates and a plurality of sequentially stacked hollow pultruded plates are stacked together.
[0010] Preferably, the solid pultruded plate and the hollow pultruded plate have the same width.
[0011] Preferably, the cross-sectional configurations of all hollow pultruded plates in the hollow pultruded plate main beam structure are the same or not completely the same or different.
[0012] Preferably, the hollow pultruded plate is provided with chamfers at both ends for thickness transition.
[0013] Preferably, the hollow pultruded plate is a rectangular plate.
[0014] Preferably, the solid pultruded plate is a rectangular plate.
[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0016] 1. Use a hollow structure to thicken the main beam, solve the problem of main beam side buckling, and reduce the weight of the main beam, effectively controlling the cost of the blade.
[0017] 2. The utility model does not change the original blade structure and production process, and maintains the existing blade mold and production steps. It only needs to add a sealing and grinding process at both ends of the hollow pultruded plate. The produced hollow pultruded plate can effectively replace the existing solid pultruded plate for blade laying and pouring.
[0018] 3. The hollow pultruded plate of the utility model is the same as the existing solid pultruded plate except for the cross-sectional shape and thickness, and is still a rectangular plate. The existing stacking and compounding method of the pultruded plate can be retained, which reduces the difficulty of stacking and compounding and ensures the strength of the main beam structure.
[0019] 4. The main beam structure is a combination of solid pultruded plates and hollow pultruded plates, which can be flexibly combined according to the blade load, making the best use of the main beam material and effectively controlling the blade cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic cross-sectional view of the blade structure of Example 1.
[0021] Figure 2 This is a schematic diagram of the local structure of the main beam of Example 1.
[0022] Figure 3 This is a schematic diagram of the stacking of hollow pultruded plates for the main beam of Example 1.
[0023] Figure 4 Schematic diagram of chamfering at both ends of the hollow pultruded plate in Example 1.
[0024] Figure 5 Schematic diagram of chamfer filling and sealing of the hollow pultruded plate in Example 1.
[0025] Figure 6This is a schematic diagram of the local structure of the main beam of Example 2.
[0026] Figure 7 This is a schematic diagram of the stacking of hollow pultruded plates for the main beam of Example 2.
[0027] Figure 8 This is a schematic diagram of the stacking of hollow pultruded plates for the main beam of Example 3. DETAILED DESCRIPTION
[0028] The present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.
[0029] Example 1
[0030] like Figure 1 As shown, this embodiment discloses a large wind turbine blade with a hollow pultruded plate main beam structure, including a pressure surface shell 1, a pressure surface sub-beam 2, a pressure surface main beam 3, a leading edge web 4, a trailing edge web 5, a suction surface main beam 6, a suction surface sub-beam 7 and a suction surface shell 8.
[0031] like Figure 2 As shown, the pressure surface main beam 3 adopts a hollow pultruded plate main beam structure, and the hollow pultruded plate main beam structure is composed of multiple hollow pultruded plates 9 stacked in sequence; the hollow pultruded plate 9 is a circular hole hollow pultruded plate, which has a circular hollow hole and is stacked in the same way as a solid pultruded plate to form a main beam, such as Figure 3 As shown; it has been verified by experiments that the circular hole hollow pultruded plate can reduce the weight of the pultruded plate while retaining the bending stiffness of the pultruded plate to the maximum extent possible, so that the pressure surface main beam 3 can reduce its own weight while meeting the ultimate bearing capacity and stability requirements.
[0032] Specifically, the hollow pultruded plate 9 is the same as the existing solid pultruded plate except for the cross-sectional form and thickness, and is still a rectangular plate, which can retain the existing pultruded plate stacking and compounding method, reduce the difficulty of stacking and compounding, and ensure the strength of the main beam structure. An installation gap is set between any adjacent hollow pultruded plates 9 for filling with curing material.
[0033] like Figure 4 and Figure 5 As shown, chamfers 13 are provided at both ends of the hollow pultruded plate 9, and the hollow pultruded plate 9 is filled with lightweight materials such as foam, and the filling range is from the chamfer starting point 16 to the chamfer end point 15, and the filling should be uniform and dense; the same resin as the blade is used to infuse the filling range, and the glue absorption at the filling position should be uniform and consistent, and then solidified; the solidified hollow pultruded plate is polished to obtain the required chamfer 13; the exposed filling position 14 at the chamfer after polishing ensures sealing, so that the pressure surface main beam 3 does not enter the resin during the blade infusion.
[0034] Example 2
[0035] The difference from the first embodiment is that the suction surface main beam 6 of the present embodiment adopts a hollow pultruded plate main beam structure. Figure 6 As shown, the main beam structure of the hollow pultruded plate is composed of a plurality of hollow pultruded plates 10 stacked in sequence; the hollow pultruded plate 10 is an elliptical hole hollow pultruded plate, which has an elliptical hollow hole and is stacked in the same manner as a solid pultruded plate to form a main beam, such as Figure 7 As shown; it has been verified by experiments that the hollow pultruded plate with elliptical holes reduces the weight of the pultruded plate while ensuring the bending stiffness of the pultruded plate, so that the suction surface main beam 6 reduces its own weight while meeting the ultimate bearing capacity and stability requirements.
[0036] Example 3
[0037] The difference from the first embodiment is that the hollow pultruded plate main beam structure of the pressure surface main beam 3 of the present embodiment is composed of hollow pultruded plates 11 and solid pultruded plates 12 stacked alternately in sequence. Figure 8 As shown, the hollow pultruded plate 11 is a square hole hollow pultruded plate, and the solid pultruded plate 12 is thinner than the hollow pultruded plate 11, which is used to combine the stiffness that meets the blade's ultimate bearing capacity requirements and the thickness of the main beam that meets the stability requirements. According to the load requirements, by flexibly combining the solid pultruded plate and the hollow pultruded plate, the main beam is finely designed to achieve the purpose of weight reduction and cost control.
[0038] Preferably, the hollow pultruded plate 11 and the solid pultruded plate 12 have the same width.
[0039] Example 4
[0040] What is different from Example 1 is that the pressure surface main beam 3 and the suction surface main beam 6 in this embodiment both adopt a hollow pultruded plate main beam structure (not shown in the figure), wherein the hollow pultruded plate main beam structure of the pressure surface main beam 3 and the suction surface main beam 6 can be composed of multiple hollow pultruded plates stacked in sequence, or hollow pultruded plates and solid pultruded plates stacked in sequence in an alternating manner, or multiple solid pultruded plates stacked in sequence and multiple hollow pultruded plates stacked in sequence are superimposed together.
[0041] Example 5
[0042] What is different from Example 3 is that the hollow pultruded plate main beam structure of the pressure surface main beam 3 described in this embodiment is composed of a plurality of solid pultruded plates stacked in sequence and a plurality of hollow pultruded plates stacked in sequence (not shown in the figure).
[0043] Example 6
[0044] What is different from Example 2 is that the hollow pultruded plate main beam structure of the suction surface main beam 6 described in this embodiment is composed of hollow pultruded plates and solid pultruded plates stacked alternately in sequence (not shown in the figure).
[0045] Example 7
[0046] What is different from Example 6 is that the hollow pultruded plate main beam structure of the suction surface main beam 6 described in this embodiment is composed of a plurality of solid pultruded plates stacked in sequence and a plurality of hollow pultruded plates stacked in sequence (not shown in the figure).
[0047] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A large wind turbine blade with a hollow pultruded plate main beam structure, comprising a blade body, characterized in that: The pressure surface main beam and the suction surface main beam of the blade body both adopt a hollow pultruded plate main beam structure or one of them adopts a hollow pultruded plate main beam structure; The hollow pultruded plate main beam structure is composed of a plurality of hollow pultruded plates stacked in sequence, and an installation gap is provided between any adjacent hollow pultruded plates for filling with solidified materials; or a solid pultruded plate and a hollow pultruded plate are stacked in combination, and the combined stacking is that the solid pultruded plate and the hollow pultruded plate are stacked alternately in sequence or a plurality of solid pultruded plates stacked in sequence and a plurality of hollow pultruded plates stacked in sequence are superimposed together, and the solid pultruded plate and the hollow pultruded plate have the same width.
2. A large wind turbine blade with a hollow pultruded plate main beam structure according to claim 1, characterized in that: The cross-sectional configurations of all hollow pultruded plates in the hollow pultruded plate main beam structure are the same or not completely the same or different.
3. A large wind turbine blade with a hollow pultruded plate main beam structure according to claim 1, characterized in that: The hollow pultruded plate is provided with chamfers for thickness transition at both ends.
4. A large wind turbine blade with a hollow pultruded plate main beam structure according to claim 1, characterized in that: The hollow pultruded plate is a rectangular plate.
5. A large wind turbine blade with a hollow pultruded plate main beam structure according to claim 1, characterized in that: The solid pultruded plate is a rectangular plate.