Wind power blade root prefabricated part structure
By circumferentially dividing the blade root preform into multiple prefabricated blocks and arranging energy absorption structures on the cutting surfaces, the problem of insufficient strength of the blade root preform is solved, and the production efficiency and quality of the blade are improved.
Patent Information
- Application Number
- CN202423159393.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-20
AI Technical Summary
During the segmentation process of the blade root prefabricated parts, the wall thickness between the bolt hole and the segmentation interface is too thin, resulting in insufficient strength and difficulty in segmentation, affecting the production efficiency and quality of the blades.
The blade root prefabricated part is cut into multiple prefabricated blocks along the circumferential direction, and gaps are reserved between adjacent blocks. The cutting surface adopts a non-linear design, increases the wall thickness, and sets an energy absorption structure such as an elastic buffer layer at the cutting surface. Positioning tooling is used for rapid installation.
It improves the strength of the blade root structure, expands the scope of application, and improves production efficiency. It is especially suitable for blade models with many bolt holes and reduces production defects.
Smart Images
Figure CN223447167U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind turbine blades, in particular to a prefabricated root structure of a wind turbine blade. Background Art
[0002] As blades continue to grow in size, the number of layers at the blade root increases, making the laying operation more difficult. Manual operation can easily cause laying defects, such as layer slippage, accumulation, wrinkles, and stratification of the leading and trailing edges. The difficulty of pouring the blade root also increases, the pouring time is prolonged, and defects are more likely to occur.
[0003] Currently, blade manufacturers use the method of blade root prefabrication to circumvent and control the above defects and problems. However, because the blade root prefabricated part is a thin shell structure with a large area and relatively small thickness, it is easy to cause shrinkage and deformation if the support is insufficient after demolding.
[0004] The blade root prefabricated parts can reduce the impact of shrinkage deformation by circumferentially dividing them into blocks. However, some blades have a large number of bolt holes at the blade root and the distance between the bolt holes is relatively small. The wall thickness between the bolt holes close to the cutting surface and the cutting surface is relatively thin, resulting in insufficient blade root strength. It may even be impossible to divide the blade root into blocks and prefabricate the blade root. Utility Model Content
[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a wind turbine blade root prefabricated structure, which can effectively solve the problem of insufficient blade root strength caused by the thin wall thickness between the bolt holes and the block interfaces of the existing blade root prefabricated blocks.
[0006] The purpose of the utility model can be achieved by adopting the following technical solutions:
[0007] A prefabricated structure for a wind turbine blade root, wherein the prefabricated blade root is divided into at least two prefabricated blocks along the circumferential direction, with a gap reserved between adjacent prefabricated blocks to facilitate the passage of resin; the cutting surface of each prefabricated block is non-linear, and the wall thickness between the bolt hole closest to the cutting surface on each prefabricated block and the cutting surface is greater than a preset spacing.
[0008] Furthermore, the section surface is in the form of a broken line, a wave, a spiral, an S-shape, or a combination thereof.
[0009] Furthermore, an energy absorbing structure is provided at the cutting surface of the prefabricated block for absorbing and dissipating energy when the blade root is subjected to impact or vibration load.
[0010] Furthermore, the energy absorbing structure is an elastic buffer layer, a damping element or a viscoelastic composite material sandwich arranged at the cutting surface.
[0011] Further, the mold of the wind power blade is provided with a positioning tool facilitating quick installation of the prefabricated blocks.
[0012] Further, the positioning tool comprises a plurality of positioning baffles, the number of the positioning baffles being consistent with the number of the prefabricated blocks, the plurality of positioning baffles being evenly distributed in the mold of the wind power blade in a circumferential direction, and each positioning baffle being located in a gap between two adjacent prefabricated blocks and detachably connected to a root flange of the mold of the wind power blade at one end.
[0013] Further, the positioning baffle and the root flange are connected through a clamping groove.
[0014] Further, a plurality of through holes for facilitating resin passing are formed on the positioning baffle.
[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0016] 1. The utility model discloses a structure of the root prefabricated part before punching, which obviously increases the wall thickness between the root bolt hole and the cutting surface, and greatly improves the root structure strength.
[0017] 2. The utility model discloses a structure of the root prefabricated part before punching, which obviously increases the wall thickness between the root bolt hole and the cutting surface, and greatly improves the root structure strength. DRAWINGS
[0018] Figure 1 It is a structure schematic view of the root prefabricated part before punching.
[0019] Figure 2 It is a structure schematic view of the root prefabricated part after punching.
[0020] Figure 3 It is a structure schematic view of the positioning tool.
[0021] Figure 4 It is a structure schematic view of the root prefabricated part and the blade after integrated molding. CONCRETE IMPLEMENTING METHOD
[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the utility model belong to the protection range of the utility model.
[0023] For example, Figures 1 to 2As shown, this embodiment provides a prefabricated structure of a wind turbine blade root, wherein the blade root prefabricated part 1 is cut into at least two prefabricated blocks 101 along the circumferential direction. This embodiment takes cutting into 6 blocks as an example, and a gap is reserved between two adjacent prefabricated blocks 101 to facilitate the passage of resin. The cutting surface 102 of each prefabricated block 101 is non-linear, and the wall thickness between the bolt hole 103 closest to the cutting surface 102 on each prefabricated block 101 and the cutting surface 102 is greater than the preset spacing, wherein the bolt holes on the prefabricated blocks are punched according to preset positions after the prefabricated blocks are integrally formed with the blade.
[0024] Specifically, the cutting surface 102 is in a broken line shape, a wave shape, a spiral shape, an S shape, or a combination thereof.
[0025] An energy-absorbing structure (not shown) is provided on the cut surface 102 of the prefabricated block 101. This structure absorbs and dissipates energy when the blade root is subjected to impact or vibration loads, thereby protecting the structural integrity of the blade root. The specific energy-absorbing structure can be an elastic buffer layer, a damping element, or a viscoelastic composite interlayer, and can be configured according to actual conditions. This embodiment uses an elastic buffer layer as an example.
[0026] Because the prefabricated blocks are not tightly fitted together, a gap is left between them to ensure the passage of resin. Therefore, when the prefabricated blocks are integrally molded with the blade, a positioning structure is required to quickly install the prefabricated blocks in the mold while ensuring that the gap size is within an appropriate range. Therefore, this embodiment provides a positioning tool within the wind turbine blade mold to facilitate the rapid installation of the prefabricated blocks.
[0027] like Figure 3 As shown, the positioning tooling includes a plurality of positioning baffles 2, the number of the positioning baffles 2 is consistent with the number of prefabricated blocks 101, and the plurality of positioning baffles 2 are evenly distributed in the circumferential direction in the mold of the wind turbine blade. Each positioning baffle 2 is located in the gap between two adjacent prefabricated blocks 101, and one end of each positioning baffle 2 is detachably connected to the blade root positioning flange 3 of the mold of the wind turbine blade. The prefabricated block 101 is positioned axially by the blade root positioning flange 3, and the prefabricated block 101 is positioned circumferentially by the positioning baffle 2.
[0028] Furthermore, the positioning baffle 2 is connected to the blade root positioning flange 3 via a slot (not shown). The positioning baffle 2 is a porous plate formed of fiberglass reinforced plastic. It can be integrally infused with the prefabricated block 101 and the fiberglass above and below the prefabricated block 101. It has multiple through-holes machined therein to facilitate the passage of resin.
[0029] When the prefabricated blocks are formed integrally with the blade, first assemble the positioning baffle and the blade root positioning flange together through the slot, then place the prefabricated blocks, then pour into the blade and finally complete the blade root punching. Figure 4 shown.
[0030] The bolt hole and the split surface are obviously increased in thickness, the bolt hole distance from the edge is avoided to be too close by using linear cutting, the blade root structure strength is improved, the practicability is high, and the blade root prefabricated part structure is suitable for promotion.
[0031] The above is only the preferred embodiment of the utility model patent, but the protection scope of the utility model patent is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model patent concept of the utility model patent within the range disclosed by the utility model patent, and it all belongs to the protection scope of the utility model patent.
Claims
1. A wind turbine blade root prefabricated structure, wherein the blade root prefabricated structure is divided into at least two prefabricated blocks along the circumferential direction, and a gap is reserved between two adjacent prefabricated blocks to facilitate the passage of resin; characterized in that: The cutting surface of each prefabricated block is non-linear, and the wall thickness between the bolt hole closest to the cutting surface on each prefabricated block and the cutting surface is greater than the preset distance.
2. The wind turbine blade root prefabricated structure according to claim 1, characterized in that: The sectioning surface is in the form of a broken line, a wave, a spiral, an S-shape, or a combination thereof.
3. The wind turbine blade root prefabricated structure according to claim 1, characterized in that: An energy absorbing structure is provided at the cutting surface of the prefabricated block for absorbing and dissipating energy when the blade root is subjected to impact or vibration load.
4. The wind turbine blade root prefabricated structure according to claim 3, characterized in that: The energy absorbing structure is an elastic buffer layer, a damping element or a viscoelastic composite material sandwich arranged at the cutting surface.
5. The wind turbine blade root prefabricated structure according to claim 1, characterized in that: The mold of the wind turbine blade is provided with a positioning tool for facilitating the rapid installation of prefabricated blocks.
6. The wind turbine blade root prefabricated structure according to claim 5, characterized in that: The positioning tooling includes multiple positioning baffles, the number of which is consistent with the number of prefabricated blocks. The multiple positioning baffles are evenly distributed in the mold of the wind turbine blade along the circumferential direction. Each positioning baffle is located in the gap between two adjacent prefabricated blocks, and one end thereof is detachably connected to the blade root positioning flange of the mold of the wind turbine blade.
7. The wind turbine blade root prefabricated structure according to claim 6, characterized in that: The positioning baffle is connected to the blade root positioning flange through a slot.
8. The wind turbine blade root prefabricated structure according to claim 6, characterized in that: The positioning baffle is processed with a plurality of through holes for resin to pass through.