Metal fiber composite plate, method for manufacturing the same, and wind power equipment

Abstract

The application discloses a metal fiber composite plate applied to a wind power blade, which comprises a metal fiber layer, the metal fiber layer comprises a metal plate and a fiber structure, the metal plate is provided with a plurality of through holes, the sizes of the plurality of through holes gradually increase along a first direction, and the fiber structure is arranged on the metal plate through the through holes. It can be seen that the metal fiber layer of the metal fiber composite plate provided by the application comprises the metal plate and the fiber structure, the fiber structure is arranged on the through holes of the metal plate, the advantages of different attribute materials are combined, the bearing capacity of the structure can be improved, and meanwhile, the structure can ensure good fatigue resistance. Meanwhile, the sizes of the plurality of through holes gradually increase along the first direction, the strength of the metal fiber composite plate in the direction from a relatively large stress part of the blade to a relatively small stress part of the blade is gradually changed, and the part with high metal proportion is prevented from being used in the relatively small stress part of the blade, so that the self weight is increased.

Description

Technical Field

[0001] This invention relates to the field of wind power, and more particularly to a metal fiber composite board, its preparation method, and wind power equipment. Background Technology

[0002] Currently, the shear force, bending moment, and torque borne by wind turbine blades are all transmitted to the blade root region, which typically bears the greatest force. Fiber materials, with their advantages of low density and good fatigue resistance, are commonly used in wind turbine blade manufacturing. Traditionally, the blade root is constructed using bolts and fiber injection. However, with the increasing size of blades and wind loads, the use of single-fiber materials has limitations in improving the strength and stiffness of the blade root, and the load-bearing capacity of the blade root region is insufficient to achieve larger blade designs. Considering that metal materials have higher load-bearing capacity, and their stiffness and strength are superior to fiber materials, applying metal-fiber composite structures to wind turbine blades combines the advantages of both materials, thus improving the blade's load-bearing capacity. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a metal fiber composite board, a method for preparing the same, and a wind power device.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A metal fiber composite panel for use in wind turbine blades includes a metal fiber layer comprising a metal plate and a fiber structure.

[0006] The metal plate has multiple through holes, and the size of the multiple through holes gradually increases along the first direction;

[0007] The fiber structure passes through the through hole and is disposed on the metal plate.

[0008] Optionally, in the above-mentioned metal fiber composite board, the curvature of the edge line of the through hole is continuous.

[0009] Optionally, in the above-mentioned metal fiber composite board, the width of the fiber structure passing through the first direction is adapted to the size of the through hole.

[0010] Optionally, in the above-mentioned metal fiber composite board, the plurality of through holes are arranged in an orderly manner along the first direction and the second direction, wherein the second direction is perpendicular to the first direction;

[0011] The width of the fiber structure passing through the second direction in the fiber structure is adapted to the size of the through hole.

[0012] Optionally, in the above-mentioned metal fiber composite board, the distance between the centers of adjacent through holes along the first direction is equal to the distance between the centers of adjacent through holes along the second direction;

[0013] The angle between the third direction and the first direction is 45 degrees;

[0014] The width of the fiber structure passing through the third direction in the fiber structure is adapted to the size of the through hole.

[0015] Optionally, in the above-mentioned metal fiber composite board, the metal board includes a curved panel, the radius of curvature of which is not less than 2.8m and not greater than 3.6m.

[0016] Optionally, the above-mentioned metal fiber composite board includes multiple layers of metal fiber stacked along the thickness direction of the metal fiber layers.

[0017] Optionally, the above-mentioned metal fiber composite board further includes fiber layers, with multiple fiber layers stacked along the thickness direction of the fiber layers, and metal fiber layers disposed between the fiber layers.

[0018] A method for preparing a metal fiber composite board includes the following steps:

[0019] Step 1: Drill holes in a metal plate to form a hole array, and then weave the fiber structure onto the perforated metal plate to form a metal fiber layer;

[0020] Step 2: Stack the metal fiber layers in multiple layers to the required thickness, or stack the metal fiber layers and multiple fiber layers to the required thickness, and inject adhesive material to form a metal fiber composite board.

[0021] A wind power device includes a wind turbine blade, and the aforementioned metal fiber composite plate is applied to the wind turbine blade;

[0022] The first direction is the direction from the root to the tip of the wind turbine blade;

[0023] The method for preparing the wind turbine blade includes the method for preparing the metal fiber composite board described above.

[0024] As can be seen from the above technical solution, the metal fiber composite board provided by the present invention comprises a metal plate and a fiber structure, with the fiber structure interlaced in the through holes provided in the metal plate. Combining the advantages of materials with different properties, it can improve the load-bearing capacity of the structure while ensuring good fatigue resistance. Simultaneously, the size of the through holes gradually increases along the first direction. When the metal fiber composite board is used in wind turbine blades, the strength of the material changes gradually from the area of ​​high stress to the area of ​​low stress. This avoids the problem of using the same fiber and metal ratio in both high-stress and low-stress areas, resulting in a high metal material ratio and thus increasing the blade's self-weight. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of the metal plate provided in an embodiment of the present invention. Figure 1 ;

[0027] Figure 2 A schematic diagram of the structure of the metal plate provided in an embodiment of the present invention. Figure 2 ;

[0028] Figure 3 This is a schematic diagram illustrating the interpenetration method of the fiber structure and the metal plate provided in an embodiment of the present invention.

[0029] in:

[0030] 1-Metal plate, 11-Through hole, 2-Fiber structure. Detailed Implementation

[0031] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of the invention, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] like Figures 1 to 3 As shown, an embodiment of the present invention provides a metal fiber composite board.

[0034] First, this metal fiber composite panel, applied to wind turbine blades, includes a metal fiber layer comprising a metal plate 1 and a fiber structure 2. The metal plate 1 has multiple through holes 11, the size of which gradually increases along a first direction. The fiber structure 2 passes through the through holes 11 and is disposed on the metal plate 1. It should be noted that the first direction is the direction from the high-stress area to the low-stress area of ​​the load-bearing component. Furthermore, since the metal fiber composite panel is applied to wind turbine blades, primarily for the blade root area, the first direction is the blade spanwise (i.e., the direction from the blade root to the blade tip). In addition, the proportion of the gradually increasing size of the through holes 11 along the first direction and the spacing between adjacent holes are not specifically limited; those skilled in the art can design them according to actual needs. The fiber structure 2, passing through the through holes 11 and disposed on the metal plate 1, can pass through adjacent through holes 11 sequentially or intermittently. Those skilled in the art can design the specific perforation method of the fiber structure 2 according to actual needs. Furthermore, the fiber structure 2 is made of non-metallic fibers, including carbon fiber and glass fiber, among others.

[0035] The metal fiber composite panel comprises a metal plate 1 and a fiber structure 2. The fiber structure 2 is interposed in the through holes 11 provided in the metal plate 1. Combining the advantages of different material properties, it can improve the load-bearing capacity of the structure while ensuring good fatigue resistance. Simultaneously, the size of the through holes 11 gradually increases along the first direction, ensuring that when the metal fiber composite panel is used on wind turbine blades, the strength of the material changes gradually from the high-stress area to the low-stress area. This avoids the problem of using the same fiber-to-metal ratio in both high-stress and low-stress areas, resulting in a high metal material ratio and increased blade weight.

[0036] In practice, the curvature of the edge line of the through hole 11 is continuous. That is, there is no abrupt change in the curvature of the edge line of the through hole 11, which avoids stress concentration caused by discontinuous curvature of the edge line of the through hole 11, leading to tearing of the metal plate 1. This is beneficial to improving the structural performance of the metal plate 1.

[0037] It should be noted that the through hole 11 is preferably a round hole, but it is not limited to this. The through hole 11 can also be an elliptical hole or a hole of other shapes, as long as the curvature of the edge line of the through hole 11 is continuous. The specific structure of the through hole 11 is not specifically limited. Those skilled in the art can make specific designs according to actual needs.

[0038] In specific implementation, the width of the fiber structure 2 passing through the first direction is adapted to the size of the through hole 11. When the fiber structure 2 passes through the through hole 11 along the first direction, the width of the fiber structure 2 is perpendicular to the first direction, and the width of the fiber structure 2 is adapted to the size of the through hole 11. The size of the through hole 11 refers to the aperture of the through hole 11 in the direction perpendicular to the first direction (i.e., the second direction). At this time, the width of the fiber structure 2 is parallel to the second direction, and the width of the aperture of the through hole 11 in the second direction is the same as or slightly smaller than the width of the fiber structure 2, which facilitates the fiber structure 2 to pass through the through hole 11. At the same time, it ensures the proportion of the fiber structure 2 in the entire metal fiber composite board and ensures the structural superiority of the metal fiber composite board.

[0039] In specific implementation, multiple through holes 11 are arranged in an orderly manner along both the first and second directions, with the second direction perpendicular to the first direction. The width of the fiber structure 2 passing through the fiber structure 2 along the second direction is adapted to the size of the through hole 11. When the fiber structure 2 passes through the through hole 11 along the second direction, the width of the fiber structure 2 is perpendicular to the second direction, and the width of the fiber structure 2 is adapted to the size of the through hole 11. The size of the through hole 11 is the aperture of the through hole 11 in the first direction. At this time, the width of the fiber structure 2 is parallel to the first direction, and the width of the aperture of the through hole 11 in the first direction is the same as or slightly smaller than the width of the fiber structure 2, which facilitates the fiber structure 2 passing through the through hole 11. At the same time, it ensures the proportion of the fiber structure 2 in the entire metal fiber composite board, ensuring the structural superiority of the metal fiber composite board.

[0040] In specific implementation, the distance between the centers of adjacent through holes 11 along the first direction is equal to the distance between the centers of adjacent through holes 11 along the second direction; the angle between the third direction and the first direction is 45 degrees; that is, the angle between the third direction and the second direction is also 45 degrees. At this time, the centers of the through holes 11 along the third direction are on a line, and the fiber structure 2 can be inserted into the through holes 11 provided in the metal plate 1 along the third direction. The width of the fiber structure 2 passing through along the third direction is adapted to the size of the through hole 11. When the fiber structure 2 passes through the through hole 11 along the third direction, the width of the fiber structure 2 is perpendicular to the third direction. The width of the fiber structure 2 is adapted to the size of the through hole 11. The size of the through hole 11 is the aperture of the through hole 11 in the direction perpendicular to the third direction (i.e., the fourth direction). At this time, the width of the fiber structure 2 is parallel to the fourth direction. The width of the aperture of the through hole 11 in the fourth direction is the same as or slightly smaller than the width of the fiber structure 2, which facilitates the fiber structure 2 to pass through the through hole 11. At the same time, it ensures the proportion of the fiber structure 2 in the entire metal fiber composite board and ensures the structural superiority of the metal fiber composite board.

[0041] In specific implementation, metal plate 1 includes magnesium alloy plate, aluminum alloy plate, or titanium alloy plate. Metal plate 1 undergoes surface treatment such as anodizing or etching. Using these lightweight alloy materials improves material strength while minimizing weight, thus helping to reduce the weight of the metal fiber composite panel.

[0042] In specific implementation, the metal plate 1 includes a curved panel with a radius of curvature of not less than 2.8m and not more than 3.6m. In addition, the radius of curvature of the curved panel is preferably 2.8m, 3.2m, or 3.6m to ensure the plasticity of the metal plate 1 and to enable the metal fiber composite board to be better applied to the root part of the wind turbine blade.

[0043] In practice, this involves stacking multiple layers of metal fibers along their thickness direction. The resulting metal fiber composite panel has higher load-bearing capacity and greater structural stability.

[0044] In specific implementation, it also includes fiber layers, with multiple fiber layers stacked along their thickness direction. Metal fiber layers are placed between the fiber layers. It should be noted that there can be single metal fiber layers between multiple fiber layers, or multiple metal fiber layers between multiple fiber layers. The specific number and arrangement order of the fiber layers and metal fiber layers in the metal fiber composite board are not limited; those skilled in the art can design according to actual needs. The bonding force between the metal and fiber structure 2 is stronger, the structure is more stable, the overall weight of the metal fiber composite board is light, and the impact resistance is good. The designability of the fiber layer and metal fiber layer arrangement can improve the blade load-bearing capacity and minimize the self-weight.

[0045] This invention provides a method for preparing a metal fiber composite board, comprising the following steps:

[0046] Step 1: Drill holes in metal plate 1 to form a hole array, and then weave fiber structure 2 onto the perforated metal plate 1 to form a metal fiber layer;

[0047] Step 2: Stack multiple layers of metal fiber to the required thickness, or stack multiple layers of metal fiber to the required thickness, and inject adhesive material to form a metal fiber composite board.

[0048] It should be noted that the adhesive material can be epoxy resin or phenolic resin, but is not limited to these. The adhesive material only needs to ensure the connection between the layers of the metal fiberboard. There are no restrictions on the specific form of the adhesive material or the specific pouring process. Those skilled in the art can make specific designs according to actual needs.

[0049] As can be seen from the above technical solution, the present invention provides a metal fiber composite board and a method for preparing the metal fiber composite board. Perforations are drilled in a metal plate 1 to form a perforation array. A fiber structure 2 is then woven onto the perforated metal plate 1 to form a metal fiber layer. Multiple layers of the metal fiber layer are stacked to the desired thickness, or multiple layers of the metal fiber layer are stacked to the desired thickness. Finally, an adhesive material is injected to form the metal fiber composite board. By combining the advantages of materials with different properties, the load-bearing capacity of the structure can be improved while ensuring good fatigue resistance.

[0050] This invention provides a wind power device, including a wind turbine blade, and the aforementioned metal fiber composite plate applied to the wind turbine blade; the first direction is the direction from the blade root to the blade tip of the wind turbine blade; the method for preparing the wind turbine blade includes the aforementioned method for preparing the metal fiber composite plate.

[0051] It should be noted that the root region of wind turbine blades experiences significant stress, necessitating increased load-bearing capacity to achieve larger blade designs. Metal fiber composite panels are used at the blade root. The fiber structure 2 is a curved panel structure, with the curvature matching that of the blade root. The preferred radii of curvature for the curved panel are 2.8m, 3.2m, and 3.6m. The first direction is from the blade root to the blade tip, the second direction is perpendicular to the first direction, and the third direction forms a 45-degree angle with the first direction. The through holes 11 in the third direction can be connected to allow the fiber structure 2 to pass through them. This configuration ensures that the proportion of the fiber structure 2 gradually increases (while the proportion of metal gradually decreases) from the blade root to the blade tip, and the weight of the metal fiber composite panel gradually decreases from the blade root to the blade tip. Fiber structure 2 uses fiber bundles or fiber cloth layers with varying widths from the blade root to the blade tip. This better ensures the transition from the metal fiber composite board to the single fiber material, achieving a gradual transition of materials. To ensure the strength requirements of the blade in the second direction, fiber material can be selectively inserted into the through holes 11 in the second direction to improve structural reliability. After the fiber structure 2 is inserted into the metal through holes 11, the resulting metal fiber layer is laid together with the blade root reinforcing fibers and then infused with adhesive material. This better enhances the load-bearing capacity of the blade root and can improve the problem of interlayer delamination failure of the fiber material.

[0052] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A metal fiber composite board, used in wind turbine blades, characterized in that, It includes multiple layers of metal fiber stacked along the thickness direction of the metal fiber layers and multiple layers of fiber stacked along the thickness direction of the fiber layers, with the metal fiber layers disposed between the fiber layers; the metal fiber layer includes a metal plate (1) and a fiber structure (2): The metal plate (1) has a plurality of through holes (11), the size of which gradually increases along the first direction; The fiber structure (2) passes through the through hole (11) and is disposed on the metal plate (1); the fiber structure (2) can pass through adjacent through holes (11) sequentially, or can pass through the through holes (11) at intervals. The width of the fiber structure (2) passing through the first direction is adapted to the size of the through hole (11); The plurality of through holes (11) are arranged in an orderly manner along the first direction and the second direction, wherein the second direction is perpendicular to the first direction; The width of the fiber structure (2) passing through the second direction is adapted to the size of the through hole (11); The distance between the centers of adjacent through holes (11) along the first direction is equal to the distance between the centers of adjacent through holes (11) along the second direction; The angle between the third direction and the first direction is 45 degrees; The width of the fiber structure (2) passing through the third direction is adapted to the size of the through hole (11); The first direction is the direction from the root to the tip of the wind turbine blade.

2. The metal fiber composite board according to claim 1, characterized in that, The curvature of the edge line of the through hole (11) is continuous.

3. The metal fiber composite board according to claim 1, characterized in that, The metal plate (1) includes a curved panel with a radius of curvature of not less than 2.8m and not more than 3.6m.

4. A method for preparing a metal fiber composite board according to any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Drill holes in the metal plate (1) to form a hole array, and weave the fiber structure (2) onto the perforated metal plate (1) to form a metal fiber layer; Step 2: Stack the multiple layers of metal fiber and the multiple layers of fiber to the required thickness, and inject adhesive material to form a metal fiber composite board.

5. A wind power device, comprising wind turbine blades, characterized in that, The metal fiber composite panel as described in any one of claims 1-3 is applied to the wind turbine blade; The method for preparing the wind turbine blade includes the method for preparing the metal fiber composite board as described in claim 4.

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