Composite structural wind turbine blade core
Patent Information
- Application Number
- CN202522082886.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-09-26
AI Technical Summary
[0003]然而，由于轻木材料来源于木材（一种生长在热带的Balsa木），一些缺陷很难避免，比如朽木、蓝斑、木结、水芯、虫洞等等不良，即使人工修补也很难达到100%去除，在风电叶片进行树脂灌注过程中，这些轻木缺陷会引发很多问题，比如爆聚，白斑，分离等缺陷，使轻木叶片存在安全隐患，常常不满足风电叶片芯材性，且增加了修补成本
1.第一板材和第二板材分别设于轻木芯材两侧并与轻木芯材的年轮所在面粘接，形成三明治式夹芯结构，在叶片灌注过程中，只有PET、PVC或SAN材质的板材与树脂接触，可将灌注缺陷减少到0，能提升芯材整体结构的稳定性和强度，进而提升了轻木叶片安全性，降低修补成本。采用PET材质或PVC材质或SAN材质，可使芯材具备良好的耐腐蚀性、抗疲劳性和力学性能，且这些材质来源广泛、成本相对较低，能降低芯材的生产成本；
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Figure CN224809723U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of composite materials technology, and in particular to a composite structure wind turbine blade core material. Background Technology
[0002] In existing wind turbine blade manufacturing processes, balsa wood is an indispensable material, especially concentrated in the blade root area. Because the blade root area is subjected to great stress, it requires materials with better performance. Compared with other composite materials, balsa wood has better mechanical properties.
[0003] However, since balsa wood is derived from wood (a type of Balsa wood that grows in the tropics), some defects are difficult to avoid, such as rotten wood, blue spots, knots, water core, wormholes, etc. Even with manual repair, it is difficult to achieve 100% removal. During the resin injection process of wind turbine blades, these balsa wood defects can cause many problems, such as bursting, white spots, and separation, which pose safety hazards to balsa wood blades, often fail to meet the requirements of wind turbine blade core material, and increase repair costs. Utility Model Content
[0004] In order to improve the performance of wind turbine blade core materials and meet the requirements of wind turbine blade use, this utility model provides a composite structure wind turbine blade core material.
[0005] The composite structure wind turbine blade core material provided by this utility model adopts the following technical solution: A composite structure wind turbine blade core material includes a balsa wood core material, a first board material, and a second board material. The first board material and the second board material are respectively disposed on both sides of the balsa wood core material. Both the first board material and the second board material are bonded to the surface where the annual rings of the balsa wood core material are located. Both the first board material and the second board material are made of PET material, PVC material, or SAN material.
[0006] By adopting the above technical solution, the first and second boards are respectively placed on both sides of the balsa core and bonded to the surface where the annual rings of the balsa core are located, forming a sandwich-style core structure. During the blade filling process, only the PET, PVC, or SAN boards come into contact with the resin, which can reduce filling defects to zero, improve the stability and strength of the overall core structure, thereby enhancing the safety of the balsa blade and reducing repair costs. Using PET, PVC, or SAN materials gives the core material good corrosion resistance, fatigue resistance, and mechanical properties. Moreover, these materials are widely available and relatively inexpensive, which can reduce the production cost of the core material.
[0007] Preferably, the sum of the thicknesses of the first board and the second board accounts for 8%-30% of the sum of the thicknesses of the balsa core material, the first board, and the second board.
[0008] By adopting the above technical solutions, the amount of the first and second plates can be reasonably controlled and the cost optimized while ensuring the overall performance of the composite structure wind turbine blade core material. At the same time, the composite structure wind turbine blade core material has a good strength-to-weight ratio.
[0009] Preferably, the thickness of both the first plate and the second plate is 3-5mm.
[0010] By adopting the above technical solutions, the overall weight and cost can be effectively controlled while ensuring the structural strength of the core material of the composite wind turbine blade.
[0011] Preferably, both the first plate and the second plate have multiple through holes.
[0012] By adopting the above technical solution, multiple through holes are opened on the first and second boards bonded to both sides of the balsa wood core material, which can reduce the weight and cost of the composite structure wind turbine blade core material, while also facilitating resin flow and gas discharge, thereby improving product quality and production efficiency.
[0013] Preferably, the diameter of the through hole is 2-4 mm.
[0014] By adopting the above technical solution, it is possible to ensure that the through holes are of a suitable size, neither too large to affect the strength of the plate nor too small to affect the relevant functional effects, which helps to improve the overall performance of the core material of the composite structure wind turbine blade.
[0015] Preferably, the hole spacing of the through holes is 20mm-50mm.
[0016] By adopting the above technical solution, through holes with a spacing of 20mm-50mm are set on the first and second plates, which can better balance the weight reduction and structural strength of the wind turbine blade core material, and avoid excessive reduction of structural strength due to too small hole spacing, or poor weight reduction effect due to too large hole spacing.
[0017] Preferably, the through hole is divided into multiple regions from one end near the root of the wind turbine blade to the other end. The diameter of the through hole is larger in the region closer to the root of the wind turbine blade, and the number of through holes in the region closer to the root of the wind turbine blade is 5%-10% higher than the number of through holes in the adjacent regions.
[0018] By adopting the above technical solutions, the area near the root can have better mechanical properties and load-bearing capacity according to the stress conditions of different parts of the wind turbine blade. At the same time, the number and diameter distribution of through holes can be reasonably controlled to optimize the overall performance and cost of the core material.
[0019] Preferably, both the first plate and the second plate are provided with a first groove and a second groove. The length direction of the first groove is perpendicular to the length direction of the second groove. There are multiple first grooves, which are spaced apart along the length direction of the second groove. There are multiple second grooves, which are spaced apart along the length direction of the first groove.
[0020] By adopting the above technical solution, the first and second grooves are designed to facilitate flexible deformation of the plate according to the shape of the blade during plate arrangement.
[0021] Preferably, the depth of both the first groove and the second groove is 2mm.
[0022] By adopting the above technical solution, the depth of the first and second grooves can be reasonably controlled while meeting the relevant performance requirements of the wind turbine blade core material. This avoids the adverse effects of being too deep or too shallow, and ensures the overall performance and quality of the composite structure wind turbine blade core material.
[0023] In summary, this utility model has the following beneficial effects: 1. The first and second boards are respectively placed on both sides of the balsa core and bonded to the surface where the annual rings of the balsa core are located, forming a sandwich-style core structure. During the blade filling process, only the PET, PVC, or SAN boards come into contact with the resin, which can reduce filling defects to zero, improve the overall stability and strength of the core structure, thereby improving the safety of the balsa blade and reducing repair costs. Using PET, PVC, or SAN materials can give the core material good corrosion resistance, fatigue resistance, and mechanical properties. Moreover, these materials are widely available and relatively inexpensive, which can reduce the production cost of the core material. 2. Multiple through holes are made in the first and second boards to improve the resin injection process and reduce the chance of problems caused by balsa wood defects. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of a composite wind turbine blade core material.
[0025] Explanation of reference numerals in the attached figures: 1. Balsa wood core; 2. First board; 3. Second board; 4. Through hole; 5. First groove; 6. Second groove. Detailed Implementation
[0026] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0027] In the description of the embodiments of this application, the words "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Rather, the use of the words "for example" or "for instance" is intended to present the relevant concepts in a specific manner.
[0028] In the description of the embodiments of this application, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.
[0029] A composite structure wind turbine blade core material, with reference to Figure 1 The structure includes a balsa wood core 1, a first board 2, and a second board 3. The first board 2 and the second board 3 are respectively disposed on both sides of the balsa wood core 1 and are both bonded to the surface where the annual rings of the balsa wood core 1 are located. This structure can effectively prevent defects in the balsa wood core 1 from causing problems during the resin injection process of the wind turbine blade. The first board 2 and the second board 3 have good stability and barrier properties, which can reduce the direct contact between balsa wood defects and resin.
[0030] Reference Figure 1 The first panel 2 is a protective structure installed on one side of the balsa core 1. It can be made of PET material, which has good mechanical properties and chemical stability, and can bond well with the balsa core 1 and resin; it can also be made of PVC material, which is relatively inexpensive and has a certain degree of flexibility; or it can be made of SAN material, which has high transparency and hardness. The shape of the first panel 2 is usually a board shape adapted to the side of the balsa core 1. During installation, it is necessary to ensure that the surface is flat to guarantee the bonding effect.
[0031] Reference Figure 1 The second board 3 is positioned on the other side of the balsa core 1, corresponding to the first board 2. The second board 3 can be made of PET, PVC, or SAN material to enhance the protection of the balsa core 1. Together with the first board 2, the second board 3 protects the balsa core 1 and reduces the risk of defects in the balsa causing problems during resin infusion.
[0032] Reference Figure 1The combined thickness of the first board 2 and the second board 3 accounts for 8%-30% of the combined thickness of the balsa core 1, the first board 2, and the second board 3. This thickness ratio is set to ensure the protective effect without excessively increasing the weight of the blades. The thickness of both the first board 2 and the second board 3 is 3-5mm.
[0033] Reference Figure 1 Multiple through holes 4 are formed on both the first board 2 and the second board 3. The radial direction of the through holes 4 is perpendicular to the surface where the annual rings of the balsa core 1 are located. The through holes 4 facilitate the flow and penetration of resin during the infusion process, allowing the resin to better bond with the balsa core 1 and the boards. The diameter of the through holes 4 is 2-4 mm, and the spacing between the holes is 20 mm-50 mm. This hole diameter and spacing ensures smooth resin flow without affecting the strength of the boards.
[0034] Reference Figure 1 The through-holes 4 are divided into multiple regions from one end near the root of the wind turbine blade to the other. The diameter of the through-holes 4 is larger in the region closer to the root of the wind turbine blade, and the number of through-holes 4 in the region closer to the root of the wind turbine blade is 5%-10% higher than the number of through-holes 4 in adjacent regions. This is because the root of the wind turbine blade is subjected to greater stress and requires more resin to enhance its strength. This differentiated arrangement of the through-holes 4 allows for better resin infusion in the root region, improving the performance of the blade root.
[0035] Reference Figure 1 Both the first plate 2 and the second plate 3 have a first groove 5 and a second groove 6, with the length direction of the first groove 5 perpendicular to the length direction of the second groove 6. Multiple first grooves 5 are provided, spaced apart along the length direction of the second groove 6. Multiple second grooves 6 are also provided, spaced apart along the length direction of the first grooves 5. The first grooves 5 and the second grooves 6 allow for flexible deformation according to the blade shape during plate arrangement. The depth of both the first groove 5 and the second groove 6 is 2mm.
[0036] The working principle of this application is as follows: by setting a first board 2 and a second board 3 on both sides of the balsa core material 1, and reasonably setting the material, thickness, through holes 4 and grooves of the boards, the problems caused by balsa defects during the resin injection process of wind turbine blades are effectively prevented, thereby improving the safety and reliability of wind turbine blades and reducing repair costs.
[0037] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.
Claims
1. A composite structure wind turbine blade core material, characterized in that: It includes a balsa wood core (1), a first board (2) and a second board (3). The first board (2) and the second board (3) are respectively disposed on both sides of the balsa wood core (1). The first board (2) and the second board (3) are both bonded to the surface where the annual rings of the balsa wood core (1) are located. The first board (2) and the second board (3) are both made of PET material, PVC material or SAN material.
2. The composite structure wind turbine blade core material according to claim 1, characterized in that: The sum of the thicknesses of the first board (2) and the second board (3) accounts for 8%-30% of the sum of the thicknesses of the balsa core material (1), the first board (2) and the second board (3).
3. The composite structure wind turbine blade core material according to claim 2, characterized in that: The thickness of the first plate (2) and the second plate (3) is 3-5mm.
4. The composite structure wind turbine blade core material according to claim 1, characterized in that: Both the first plate (2) and the second plate (3) have multiple through holes (4).
5. The composite structure wind turbine blade core material according to claim 4, characterized in that: The diameter of the through hole (4) is 2-4 mm.
6. The composite structure wind turbine blade core material according to claim 5, characterized in that: The hole spacing of the through hole (4) is 20mm-50mm.
7. The composite structure wind turbine blade core material according to claim 6, characterized in that: The through hole (4) is divided into multiple regions from one end near the root of the wind turbine blade to the other end. The diameter of the through hole (4) is larger in the region closer to the root of the wind turbine blade, and the number of through holes (4) in the region closer to the root of the wind turbine blade is 5%-10% higher than the number of through holes (4) in the adjacent regions.
8. The composite structure wind turbine blade core material according to claim 1, characterized in that: Both the first plate (2) and the second plate (3) are provided with a first groove (5) and a second groove (6). The length direction of the first groove (5) is perpendicular to the length direction of the second groove (6). There are multiple first grooves (5) and they are spaced apart along the length direction of the second groove (6). There are multiple second grooves (6) and they are spaced apart along the length direction of the first groove (5).
9. The composite structure wind turbine blade core material according to claim 8, characterized in that: The depth of the first groove (5) and the second groove (6) is 2mm.