Web, blade and wind generating set

Abstract

The invention provides a web plate, a blade and a wind generating set, the web plate is used for the blade of the wind generating set, the web plate comprises a main body, the main body comprises a first core material and a second core material which extend in the length direction of the main body, and the second core material is at least arranged on one side of the main body in the width direction; the first core material is connected with the second core materials, and the first core material and the at least one second core material are made of different materials. According to the web plate, on the basis that the safety of the web plate is improved, the weight of the web plate can be reduced as much as possible.

Description

[0001] This application is a divisional application of the invention patent application filed on November 29, 2023, with application number "202311611363.4" and invention title "Web plate, blade and wind turbine generator set for blade of wind turbine generator". Technical Field

[0002] This invention relates to the field of wind power generation, specifically to a web, blade, and wind turbine generator set. Background Technology

[0003] Wind turbine blades are the primary components for absorbing wind energy and are therefore subject to significant wind loads. As the megawatt capacity of wind turbines increases, the loads on the blades also increase. The main load-bearing structure of the blade consists of one or more longitudinally extending spars, which include the main spars and the web between them. The web is bonded to the main spars and primarily bears the shear loads of the blade. To reduce the weight of the blade, the web is typically constructed using a sandwich structure, consisting of a biaxial fiber cloth and a foam core material in between. Summary of the Invention

[0004] The purpose of this application is to provide a web, blade, and wind turbine generator set to solve the problem of poor load-bearing capacity but large overall weight of existing webs.

[0005] According to one aspect of the present invention, a web is provided for a blade of a wind turbine generator set, the web comprising a body, the body comprising a first core material and a second core material extending along the length direction of the body, the second core material being disposed at least on one side in the width direction of the body, the first core material being connected to the second core material, the first core material and at least one of the second core materials being made of different materials.

[0006] According to one aspect of this disclosure, the performance parameters of the second core material are higher than those of the first core material, enabling the second core material to withstand a greater shear load than the first core material.

[0007] According to one aspect of this disclosure, the density of the second core material is greater than that of the first core material.

[0008] According to one aspect of this disclosure, the length of the second core material in the length direction of the body is greater than or equal to 0.5m, and / or the width of the second core material in the width direction of the body is 100-300mm.

[0009] According to one aspect of this disclosure, the web further includes a C-shaped opening formed at the root of the body, and the second core material extends at least 0.5 m beyond the cutoff position of the C-shaped opening in the length direction of the body.

[0010] According to one aspect of this disclosure, in the width direction of the web, the second core material is located outside the first core material.

[0011] According to one aspect of this disclosure, the first core material and the second core material have the same thickness at the same axial position, or the first core material and the second core material have different thicknesses at the same axial position, and the first core material and the second core material have a smooth transition.

[0012] According to one aspect of this disclosure, the first core material and the second core material have different thicknesses at the same axial position, and the first core material and the second core material are smoothly transitioned by a chamfer with a chamfer ratio of 1:5.

[0013] According to one aspect of this disclosure, the first core material is PVC60 or PET100, and the second core material is PVC150, PET150, or PET200.

[0014] According to one aspect of this disclosure, the second core material is arranged on both sides of the body in the width direction, the first core material is located between the second core materials, and the web further includes a first stop and a second stop, the first stop and the second stop being connected to the body on both sides of the body in the width direction.

[0015] According to another aspect of the present invention, a blade for a wind turbine generator is provided, comprising: a lower housing; an upper housing disposed opposite to and coupled to the lower housing; and a web as described in any of the preceding claims, wherein the two sides of the web in the width direction are respectively coupled to the upper housing and the lower housing.

[0016] According to another aspect of the present invention, a wind turbine generator set is provided, comprising: a tower; a nacelle disposed at the top of the tower; a hub rotatably connected to the nacelle; and blades as described above, rotatably connected to the hub.

[0017] According to the web of the present invention, since the web adopts a composite structure of multiple core materials, the weight of the web is reduced to the greatest extent while improving the safety of the web. Attached Figure Description

[0018] The above and / or other objects and advantages of the present invention will become more apparent from the following description of embodiments in conjunction with the accompanying drawings, wherein: Figure 1 A schematic diagram of a cross-section of a blade along its length direction according to an exemplary embodiment of the present invention is shown; Figure 2 A schematic diagram of the web of a blade for a wind turbine generator according to an exemplary embodiment of the present invention is shown; Figure 3A schematic diagram showing the web of a wind turbine blade taken along line AA according to an exemplary embodiment of the present invention is shown. Figure 4 A schematic perspective view of a portion of the web of a blade for a wind turbine generator according to an exemplary embodiment of the present invention is shown. Figure 5 A schematic cross-sectional view of a portion of the body of the web of a wind turbine blade according to an exemplary embodiment of the present invention is shown. Figure 6 It shows Figure 5 An enlarged view of part I. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described more fully with reference to the accompanying drawings. However, the embodiments of the invention should not be construed as limited to those set forth herein. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0020] Figure 1 A schematic diagram of a cross-section of a blade along its length direction according to an exemplary embodiment of the present invention is shown; Figure 2 A schematic diagram of the web of a blade for a wind turbine generator according to an exemplary embodiment of the present invention is shown; Figure 3 A schematic diagram showing the web of a wind turbine blade taken along line AA according to an exemplary embodiment of the present invention is shown. Figure 4 A schematic perspective view of a portion of the web of a blade for a wind turbine generator according to an exemplary embodiment of the present invention is shown. Figure 5 A schematic cross-sectional view of a portion of the body of the web of a wind turbine blade according to an exemplary embodiment of the present invention is shown. Figure 6 It shows Figure 5 An enlarged view of part I.

[0021] Reference Figures 1 to 4 According to an exemplary embodiment of the present invention, the web 100 for a wind turbine blade includes: a body 1, which is elongated and the width of the body 1 gradually decreases along the length direction from the root to the tip of the body 1; a first flange 2 and a second flange 3, which are formed on both sides of the body 1 along the width direction of the body 1 to form an I-shape or a C-shape with the body 1; and a C-shaped opening 4, which is formed at the root of the body 1, wherein the C-shaped opening 4 includes a curved flexible portion extending toward the center of the C-shaped opening 4.

[0022] Optionally, in this exemplary embodiment, the C-shaped opening 4 may be formed at the starting end of the root of the body 1, for example, by cutting the root of the body 1 in a C-shape, and the C-shaped opening 4 is relative to the center line of the body 1 ( Figure 2The AA line in the middle is basically formed in a symmetrical shape.

[0023] Typically, as the megawatt capacity of wind turbine generators increases, the load on the blades also increases, and correspondingly, the load on the web also increases. The starting end of the web root is subjected to a large peeling load, and the C-shaped opening may buckle failure. However, in this invention, the C-shaped opening 4 includes a bending flexible portion formed at its end to unload the aforementioned peeling load multiple times along the bending direction, thereby effectively improving the load-bearing capacity of the web 100, while significantly increasing the buckling resistance of the C-shaped opening 4 and reducing the risk of delamination failure of the C-shaped opening 4.

[0024] like Figures 2 to 4 As shown, the C-shaped opening 4 also includes an edge portion 6, the thickness of which extends from its outer edge away from the center of the C-shaped opening 4. Figure 2 The portion gradually increases in size (position B), wherein the flexible bending portion extends from the edge portion 6 toward the center of the C-shaped opening 4. Optionally, the flexible bending portion is formed of fiberglass layup.

[0025] Optionally, in this exemplary embodiment, the edge portion 6 can be formed by grinding the outer edge of the C-shaped opening 4, and can be chamfered or wedge-shaped. The curved flexible portion extends a predetermined distance from the edge portion 6 toward the center of the C-shaped opening 4 in a curved shape, and is formed by fiberglass lay-up.

[0026] Optionally, in this exemplary embodiment, as Figure 3 As shown, the flexible bending portion includes: a flat portion 7, which extends horizontally from the outer edge of the edge portion 6; a first inclined portion 8, which extends obliquely from the end of the flat portion 7 away from the edge portion 6, and the first inclined portion 8 and the edge portion 6 are located on the same side of the flat portion 7 in the thickness direction of the web; and a second inclined portion 9, which extends obliquely from the end of the first inclined portion 8 toward the flat portion 7.

[0027] Optionally, in this exemplary embodiment, the flexible bending portion may further include a first bending portion 10 and a second bending portion 11, wherein the flat portion 7 is connected to the first inclined portion 8 at the first bending portion 10, and the first inclined portion 8 is connected to the second inclined portion 9 at the second bending portion 11. Although Figure 3 The second inclined portion 9 is shown to be relatively short, but the invention is not limited thereto. The length of the second inclined portion 9 can be extended, and the second inclined portion 9 can be inclined relative to the second curved portion 11 toward the flat portion 7.

[0028] like Figure 3 As shown, optionally, the included angle between the flat portion 7 and the first inclined portion 8 can be between 120 degrees and 150 degrees. Optionally, the radius of the arc of the first curved portion 10 and the second curved portion 11 can be greater than or equal to 10 millimeters.

[0029] Optionally, in an exemplary embodiment, the flexible bending portion can be integrally cast with other parts of the web 100. Specifically, in the process of forming the web 100, a male mold can be placed below the first inclined portion 8, and a layup can be placed above the male mold to form the entire web 100 by integral casting. However, the formation of the flexible bending portion is not limited to this. Optionally, the flexible bending portion can be manufactured separately and then connected to the edge portion 6 to form the complete web 100. Further optionally, the flat portion 7 in the flexible bending portion can be formed separately from other parts of the flexible bending portion. For example, the flat portion 7 can be integrally formed with the edge portion 6 during vacuum casting of the web 100, and the other parts of the flexible bending portion can be manufactured separately and then connected to the flat portion 7.

[0030] Optionally, in this exemplary embodiment, the first guard edge 2 and the second guard edge 3 each include guard edge extensions 5 extending beyond both ends of the C-shaped opening 4. Optionally, the guard edge extensions 5 may be formed of at least four layers of fabric.

[0031] like Figure 4 As shown, to further reduce the excessive stiffness at both ends of the C-shaped aperture 4, a flange extension 5 is provided at the starting position of the first flange 2 and the second flange 3 of the web 100 at the blade root. This flange extension 5 can be formed by at least four layers of fabric, and the fabric type is not limited to biaxial fabric, but can also be triaxial fabric, etc. Since the flange extension 5 does not include the core material, it can greatly reduce the stress concentration at the starting end of the web 100 and share the peel stress at the starting position of the web 100, thereby significantly improving the structural safety of the web 100 and the blade.

[0032] like Figure 5 and Figure 6 As shown, the main body 1 may include two core materials of different materials, a first core material 13 and a second core material 14. The second core material 14 is located at the root of the main body 1, adjacent to the first side 2 and the second side 3. The density of the second core material 14 is greater than that of the first core material.

[0033] Optionally, the main body 1 of the web 100 can be integrally formed by laying a fiber cloth, laying a core material in the middle, laying a fiber cloth on the core material, and then vacuum casting. In this exemplary embodiment, the material of the core material laid in the middle can be different. For example, the density of the second core material 14 located at the root of the main body 1 adjacent to the first sidewall 2 and the second sidewall 3 can be greater than the density of the first core material 13 laid in the middle part of the length direction of the web 100. Specifically, as... Figure 5 As shown, a second core material 14 can be laid adjacent to the first retaining edge 2 and the second retaining edge 3. The second core material 14 is formed to a predetermined width and extends a predetermined length in the length direction of the main body 1. A first core material 13 is laid between the second core material 14 adjacent to the first retaining edge 2 and the second core material 14 adjacent to the second retaining edge 3.

[0034] Optionally, the length of the second core material 14 in the longitudinal direction of the main body 1 can be greater than or equal to 0.5 meters, and the width of the second core material 14 in the width direction of the main body 1 can be between 100 mm and 300 mm. Optionally, the length of the second core material 14 can extend from the root to the tip of the main body 1.

[0035] like Figure 5 and Figure 6 As shown in this exemplary embodiment, the main body 1 of the web 100 adopts a different core material configuration structure. That is, the main body 1 includes a first core material 13 and a second core material 14, which have different performance parameters. The second core material 14 has higher performance parameters (e.g., density) than the first core material 13. The second core material 14 extends more than 0.5 meters beyond the C-shaped opening 4 in the length direction of the web 100 at the starting position of the web 100. The second core material 14 with high performance parameters is located near the PS main beam and SS main beam of the web 100. The width of the second core material 14 is preferably in the range of 100~300mm, thereby improving the performance of the web 100 while minimizing its weight.

[0036] Optionally, the second core material 14 can be a high-density core material such as Balsa 150, PET 150, or PET 200. Generally, higher core material density results in improved performance. The first core material 13 can be a low-density core material such as PVC 60 or PET 100. Preferably, the first core material 13 and the second core material 14 at the same axial position can have the same thickness. If different thicknesses are used, the first core material 13 and the second core material 14 are smoothly transitioned by chamfering, with the chamfer ratio preferably being 1:5.

[0037] During the operation of a wind turbine, the blades undergo torsional deformation under wind loads, and the stress is transferred through the shell to the web, causing the web to deform accordingly. During this process, the connection between the web and the shell is prone to failure under tensile and bending loads due to stress concentration. For example, fracture damage may occur at the boundary between the web flange and the core material, causing structural damage to the web, or the adhesive layer between the web flange and the blade shell may crack, leading to the separation of the web from the shell. However, according to the embodiments of this application, by replacing the core material on the side of the web with a higher-performance core material, the overall performance of the web can be effectively improved, the stiffness of the connection area between the web and the blade shell is significantly enhanced, and the deformation is greatly reduced under the same wind load, avoiding failure in the connection area.

[0038] The technical effectiveness of the solutions in this application embodiment has been further verified through testing. For example, when using PVC60 foam to make the web core material, the failure load is relatively small, and the web is quite sensitive to shear loads. Under bending loads, the web core material is prone to shear failure. In the test, by replacing the core material on both sides of the web with balsa wood, the compression modulus of the web can be increased by about 50 times, and the shear modulus can be increased by more than 5 times. The overall structural performance of the web is enhanced, thereby significantly increasing the safety margin of the web and effectively avoiding failure in the web connection area.

[0039] The present invention also provides a wind turbine blade, the wind turbine blade comprising a housing and a web 100 according to the present invention, the web 100 being disposed within the housing.

[0040] The present invention also provides a wind turbine generator set, which includes a tower, a nacelle disposed at the top of the tower, a hub rotatably connected to the nacelle, and blades according to the present invention, the blades being rotatably connected to the hub.

[0041] The manufacturing process of the blade shell according to the present invention is briefly described below.

[0042] The first step is to lay the lower skin of the web plate 100 into the web plate mold, lay the first core material 13 and the second core material 14 in the corresponding positions, and do a good job of splicing and polishing the boundaries of different core materials to avoid excessive roughness of different core materials.

[0043] The second step is to lay the upper skin of the web plate 100.

[0044] The third step involves using a vacuum injection process to inject resin into the web 100 and then curing it.

[0045] The fourth step is to bond the prepared upper and lower shells to the web plate 100 to complete the blade fabrication.

[0046] According to the web of the present invention, since the C-mouth includes a flexible portion formed at its end to unload the peeling load borne by the web during operation multiple times along the bending direction, the load-bearing capacity of the web can be effectively improved, while significantly increasing the buckling resistance of the C-mouth and reducing the risk of failure delamination of the C-mouth.

[0047] According to the web of the present invention, since the first and second retaining edges include retaining edge extensions, the stress concentration at the starting end of the web is greatly reduced, the peeling stress at the starting position of the web is shared, the failure risk of web cracking is reduced, and thus the structural safety of the web is greatly improved.

[0048] According to the web of the present invention, since the web adopts a composite structure of multiple core materials, the weight of the web is reduced to the greatest extent while improving the safety of the web.

[0049] In this invention, 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 number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] For ease of description, directional terms such as front, back, up, down, horizontal, and vertical are used to describe the structure and operation of the device. However, the orientation of the device is not limited to these terms. The device can be flipped back and forth, flipped up and down, or positioned according to other angular orientations.

[0052] The features, structures, or characteristics described in this invention can be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided to give a full understanding of embodiments of the invention. However, those skilled in the art will recognize that the technical solutions of the invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the invention.

Claims

1. A web for a wind turbine blade, characterized in that, The web includes a body (1), the body (1) including a first core material (13) and a second core material (14) extending along the length direction of the body (1), the second core material (14) being arranged on at least one side in the width direction of the body, the first core material (13) being connected to the second core material (14), and the first core material (13) and at least one of the second core materials (14) being made of different materials.

2. The web according to claim 1, characterized in that, The performance parameters of the second core material (14) are higher than those of the first core material (13), which enables the second core material (14) to withstand a greater shear load than the first core material (13).

3. The web according to claim 2, characterized in that, The density of the second core material (14) is greater than that of the first core material (13).

4. The web according to claim 1, characterized in that, The length of the second core material (14) in the length direction of the main body (1) is greater than or equal to 0.5m, and / or the width of the second core material (14) in the width direction of the main body (1) is 100-300mm.

5. The web according to claim 1, characterized in that, The web also includes a C-shaped opening (4) formed at the root of the body (1), and the second core material (14) extends more than 0.5m beyond the cut-off position of the C-shaped opening (4) in the length direction of the body (1).

6. The web according to claim 1, characterized in that, In the width direction of the web, the second core material (14) is located outside the first core material (13).

7. The web according to any one of claims 1-6, characterized in that, The first core material (13) and the second core material (14) have the same thickness at the same axial position, or the first core material (13) and the second core material (14) have different thicknesses at the same axial position, and the first core material (13) and the second core material (14) have a smooth transition.

8. The web according to any one of claims 1-6, characterized in that, The first core material (13) and the second core material (14) have different thicknesses at the same axial position. The first core material (13) and the second core material (14) are smoothly transitioned by chamfers, and the ratio of the chamfers is 1:

5.

9. The web according to any one of claims 1-6, characterized in that, The first core material (13) is PVC60 or PET100, and the second core material (14) is balsa150 or PET150 or PET200.

10. The web according to any one of claims 1-6, characterized in that, The second core material (14) is arranged on both sides of the body (1) in the width direction, and the first core material (13) is located between the second core material (14). The web also includes a first stop (2) and a second stop (3), and the first stop (2) and the second stop (3) are connected to the body (1) on both sides of the body (1) in the width direction.

11. A blade for a wind turbine generator set, characterized in that, include: Lower housing; The upper housing is disposed opposite to and joined to the lower housing; The web plate as described in any one of claims 1-10, wherein the two sides of the web plate in the width direction are respectively connected to the upper shell and the lower shell.

12. A wind turbine generator set, characterized in that, include: Tower; The nacelle is located at the top of the tower; The hub is rotatably connected to the nacelle; The blade as described in claim 11 is rotatably connected to the hub.

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