Pultruded plate, pultruded main beam and wind turbine blade

Abstract

The present application provides a pultruded plate, a pultruded main beam and a wind turbine blade. The pultruded plate comprises: a plate body; an inner cavity, which is provided on the plate body and extends along the length direction of the plate body; wherein, in the length direction, the inner cavity comprises a plurality of cavity segments with different inner diameters. In the above structure, by providing the inner cavity on the plate body so that the plate body is a hollow structure, the weight can be significantly reduced compared to a pultruded plate with a solid densified structure, so that more stacking can be performed when manufacturing large-scale wind turbine blades, reducing the restrictions on the use of pultruded plates on large wind turbine blades and improving the utilization rate of pultruded materials; in addition, by changing the inner diameter of the inner cavity along the length direction of the plate body, the pultruded plate has a variable cross-section inner cavity, which can change the thickness of the pultruded plate accordingly, thereby facilitating the forming of the pultruded main beam, or can achieve more sufficient and flexible weight reduction when the thickness of the plate body does not change accordingly.

Description

Technical Field

[0001] The present application relates to the technical field of wind power equipment, and in particular to a pultruded plate, a pultruded main beam and a wind power blade. Background Art

[0002] The main beam is the main load-bearing component in the wind turbine blade structure. It bears most of the bending load of the wind turbine blade. Its strength and stiffness directly affect the load-bearing capacity of the wind turbine blade.

[0003] Currently, most main beams are made of several pultruded sheets stacked together, each of which has a solid, dense structure. To ensure that the main beams of wind turbine blades meet the required stiffness and strength, a large number of pultruded sheets must be stacked. However, due to the heavy weight of the densely packed pultruded sheets, the main beams formed by excessive stacking of pultruded sheets are heavy, resulting in the main beams being unable to meet the lightweight design requirements of large wind turbine blades, thus limiting the use of pultruded sheets in large wind turbine blades. Summary of the Invention

[0004] In view of this, the present application provides a pultruded plate material that can reduce or even avoid the limitations of the pultruded plate material on large wind turbine blades. In addition, the present application also provides a pultruded main beam having the pultruded plate material, and a wind turbine blade having the pultruded main beam.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A pultruded plate, comprising:

[0007] Plate body;

[0008] An inner cavity is provided on the plate body and extends along the length direction of the plate body;

[0009] Wherein, in the length direction, the inner cavity includes a plurality of cavity segments with different inner diameters.

[0010] Optionally, in the above-mentioned pultruded plate, in the length direction, the inner diameters of the multiple cavity segments continuously increase from one end to the other end of the plate body.

[0011] Optionally, in the above pultruded plate, the plurality of cavity segments include a first constant diameter cavity segment and a second constant diameter cavity segment, and a variable diameter cavity segment located between the first constant diameter cavity segment and the second constant diameter cavity segment;

[0012] The inner diameter of the first constant diameter cavity section is greater than the inner diameter of the second constant diameter cavity section, and the inner diameter of the variable diameter cavity section changes gradually to transitionally connect the first constant diameter cavity section and the second constant diameter cavity section.

[0013] Optionally, in the above-mentioned pultruded sheet, in the thickness direction of the sheet body, the portion of the sheet body surrounding the inner cavity is the cavity wall portion; and

[0014] In the length direction, the thickness of the cavity wall portion remains constant, and the thickness of the plate body changes with the change of the inner diameter.

[0015] Optionally, in the above-mentioned pultruded sheet, on the cross section perpendicular to the length direction, one or more inner cavities are provided along the width direction of the sheet body, and the cross-sectional shape of the inner cavity is a combination of one or more of circular, elliptical, regular polygonal, and irregular polygonal.

[0016] Optionally, in the above-mentioned pultruded plate, in the width direction of the plate body, the inner cavity includes multiple cavities with the same cross-sectional shape.

[0017] A pultruded main beam comprises the pultruded plate material described in any one of the above items.

[0018] Optionally, in the above-mentioned pultruded main beam, a pultruded plate whose thickness changes with the change of the inner diameter forms an integrated pultruded main beam.

[0019] Optionally, in the above-mentioned pultruded main beam, a plurality of pultruded plates whose thickness changes with the change of the inner diameter are stacked to form the pultruded main beam.

[0020] A wind turbine blade comprises a pultruded main beam, wherein the pultruded main beam is any of the pultruded main beams described above.

[0021] The pultruded sheet provided in the present application is an open sheet with an inner cavity formed by opening holes in the pultruded sheet. Compared with the existing pultruded sheet with a solid densified structure, the overall weight of the pultruded sheet can be reduced, thereby reducing or even avoiding the limitations on the use of the pultruded sheet on large wind turbine blades; at the same time, the inner cavity includes multiple cavity segments with different inner diameters in the length direction of the pultruded sheet, so that the pultruded sheet has a variable cross-section hole structure, so that the thickness of the pultruded sheet can be changed, which is beneficial to the forming of the pultruded main beam, or the weight can be reduced more fully and flexibly, so that the structure and weight of the pultruded main beam can be optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0023] Figure 1A schematic diagram of the structure of a pultruded plate provided in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the structure of the pultruded plate after being cut parallel to the length direction;

[0025] Figure 3 for Figure 2 a front view of the structure shown;

[0026] Figure 4 It is a structural schematic diagram of an inner cavity with a rectangular cross-section;

[0027] Figure 5 A schematic diagram of the structure of an inner cavity with a cross-sectional shape of two isosceles triangles mirror-connected;

[0028] Figure 6 It is a schematic structural diagram of an inner cavity with a square cross-section;

[0029] Figure 7 It is a structural schematic diagram of an inner cavity with a circular cross-section;

[0030] Figure 8 It is a schematic diagram of the structure of the inner cavity with a hexagonal cross-section.

[0031] exist Figures 1-8 middle:

[0032] 1-plate body, 2-inner cavity;

[0033] 101 - cavity wall portion, 201 - first constant diameter cavity section, 202 - variable diameter section, 203 - second constant diameter cavity section. DETAILED DESCRIPTION

[0034] The present application provides a pultruded plate material that can reduce or even avoid the limitations of the pultruded plate material on large wind turbine blades. In addition, the present application also provides a pultruded main beam having the pultruded plate material, and a wind turbine blade having the pultruded main beam.

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] like Figures 1-8 As shown, the embodiment of the present application provides a pultruded plate for manufacturing wind turbine blades, the structure of which includes a plate body 1 and an inner cavity 2 opened on the plate body 1, wherein, as shown in FIG. Figure 1As shown, for example, the plate body 1 can be formed into a rectangular plate, and the inner cavity 2 extends along the length direction of the plate body 1, that is, the inner cavity 2 is formed by opening a hole in the plate body 1 along the length direction of the plate body 1, and in this length direction, as shown Figure 2 and Figure 3 As shown, the inner cavity 2 includes multiple cavity segments with different inner diameters, that is, the inner cavity 2 is a variable diameter inner cavity (or a variable cross-section inner cavity). By setting it in this way, the pultruded sheet can have different structures. For example, in one structure, the overall thickness of the pultruded sheet changes with the change of the inner diameter of the inner cavity 2, that is, when the inner cavity 2 is a variable diameter inner cavity, the pultruded sheet is a variable thickness sheet, and the change in the sheet thickness is the change in the inner diameter. At this time, the pultruded sheet is a rectangular plate with a changed thickness in the length direction; for example, in another structure, the overall thickness of the pultruded sheet remains unchanged, and the size of the inner cavity 2 is changed by changing the thickness of the cavity wall (this cavity wall is the cavity wall portion 101 described later), that is, when the cavity wall thickness is smaller, the inner diameter of the inner cavity 2 is larger, and when the cavity wall thickness is larger, the inner diameter of the inner cavity 2 is smaller.

[0037] The pultruded sheet material of the above structure firstly forms a hollow structure by opening an inner cavity 2 on the sheet material body 1. Compared with the existing solid and densely structured pultruded sheet material, the weight can be significantly reduced, so that more stacking can be performed when manufacturing large-scale wind turbine blades, reducing or even avoiding the limitations on the use of pultruded sheet materials on large wind turbine blades, and also improving the utilization rate of pultruded materials; in addition, the inner diameter of the inner cavity 2 changes in the length direction of the sheet material body 1, so that the pultruded sheet material has a variable cross-section inner cavity 2, which can either change the thickness of the pultruded sheet material accordingly and be beneficial to the forming of the pultruded main beam, or can more fully and flexibly reduce the weight when the thickness of the sheet material body 1 does not change accordingly, so that the structure and weight of the pultruded main beam can be optimized, or the strength, stiffness, anti-buckling ability, load-bearing performance, etc. of the pultruded main beam can be improved.

[0038] Preferably, in the length direction of the plate body 1, the inner diameters of the plurality of cavity segments increase continuously from one end to the other end of the plate body 1, such as Figure 2 and Figure 3 That is to say, the present application makes the inner cavity 2 a gradually expanding inner cavity, which can not only reduce the weight of the pultruded plate to a greater extent and save materials, but also improve the mechanical properties of the pultruded plate to a certain extent.

[0039] Furthermore, under the premise that the inner cavity 2 has multiple cavity sections with different inner diameters in the length direction of the plate body 1, as shown in FIG. Figure 2 and Figure 3As shown, in the length direction of the plate body 1: multiple cavity segments include a first equal diameter cavity segment 201 and a second equal diameter cavity segment 203, and a variable diameter cavity segment 202 located between the first equal diameter cavity segment 201 and the second equal diameter cavity segment 203; wherein, the inner diameter of the first equal diameter cavity segment 201 is larger than the inner diameter of the second equal diameter cavity segment 203, and the inner diameter of the variable diameter cavity segment 202 gradually changes to transitionally connect the first equal diameter cavity segment 201 and the second equal diameter cavity segment 203. In this structure, the inner diameters of the first equal-diameter cavity segment 201 and the second equal-diameter cavity segment 203 in the multiple cavity segments are equal everywhere, and their inner diameters do not change. In addition, the inner diameters of the first equal-diameter cavity segment 201 and the second equal-diameter cavity segment 203 are not equal. Specifically, the inner diameter of the first equal-diameter cavity segment 201 is larger than the inner diameter of the second equal-diameter cavity segment 203, and the inner diameter of the variable-diameter cavity segment 202 connecting the first equal-diameter cavity segment 201 and the second equal-diameter cavity segment 203 changes, and the change is gradual. In this way, the first equal-diameter cavity segment 201 and the second equal-diameter cavity segment 203 with unequal inner diameters can be smoothly transitioned and connected, so that the pultruded plate has good mechanical properties under the premise of reducing weight.

[0040] In the above structure, the inner cavity 2 includes a first constant diameter cavity section 201, a second constant diameter cavity section 203 and a variable diameter cavity section 202, which can make the entire pultruded sheet material a sheet material with a changed thickness in the middle and a constant thickness on both sides, and further preferably, the thickness of the variable diameter cavity section 202 is linearly gradient, so that the surface of the sheet material body 1 corresponding to the variable diameter cavity section 202 is an inclined surface. This structure is relatively regular, which is conducive to the forming, stacking, improvement of mechanical properties of the sheet material body 1 and matching with the shape of wind turbine blades, etc., so it is used as the preferred structure of this application. In addition, the inner cavity 2 may also not include a constant diameter section, but only include a variable diameter section 202, that is, the inner diameters of the inner cavity 2 at various locations in the longitudinal direction are different, and the change trend of the inner diameter can be linear or nonlinear, so that the surface of the pultruded sheet material is an inclined surface or a curved surface, etc.

[0041] Furthermore, as mentioned above, on the basis that the inner cavity 2 has the variable diameter section 202, the overall thickness of the pultruded sheet can change accordingly with the change of the inner diameter, or it can remain unchanged. In the present application, it is preferred that the overall thickness of the pultruded sheet changes accordingly with the change of the inner diameter, that is: Figure 2 and Figure 3As shown, in the thickness direction of the plate body 1, the portion of the plate body 1 that encloses the inner cavity 2 is the cavity wall portion 101; and in the length direction, the thickness of the cavity wall portion 101 itself remains unchanged, so that the thickness of the plate body 1 changes with the change of the inner diameter. In this way, the thickness of different parts of the pultruded plate can be controlled by controlling the change of the inner diameter of the inner cavity 2, thereby making the shape of the pultruded plate closer to the shape of the pultruded main beam and better matching the overall structure of the wind turbine blade. In addition, this structure can also minimize the weight of the pultruded plate, making the pultruded plate a variable thickness plate, thereby reducing the height limit of the pultruded main beam and better avoiding the weight increase caused by excessive stacking of pultruded plates.

[0042] In this application, there are also multiple options for the arrangement of the inner cavity 2, such as Figure 4-Figure 8 As shown, in the cross section perpendicular to the length direction, there are one or more inner cavities 2 along the width direction of the plate body 1, and the cross-sectional shape of the inner cavity 2 can be a combination of one or more of a circle, an ellipse, a regular polygon, and an irregular polygon; further preferably, in the width direction of the plate, there are multiple inner cavities 2, and the cross-sectional shape is the same. That is, when there is one inner cavity 2 in the width direction, its cross-sectional shape can be any one of a circle, an ellipse, a regular polygon, and an irregular polygon, as shown in FIG. Figure 4 As shown, it can be a rectangle, or Figure 5 The mirror-image docking shape of the two isosceles trapezoids shown in the figure, etc. When the inner cavity 2 is provided in a plurality in the width direction, the cross-sectional shapes of the plurality of inner cavities 2 may all be the same, for example Figure 6-Figure 8 As shown, they may all be square, circular, hexagonal, etc., or the cross-sectional shapes of the multiple inner cavities 2 may be partially the same or different.

[0043] In addition, the present application also provides a pultruded main beam, which includes the above-mentioned pultruded plate. The beneficial effects of this pultruded main beam brought about by the structure of the pultruded plate itself can be found in the above content and will not be repeated here.

[0044] When the pultruded plates are formed into pultruded main beams, there are many ways to set them up:

[0045] In a preferred arrangement, a pultruded sheet is made to have a larger volume and to form an integrated pultruded main beam, that is, a pultruded sheet is a pultruded main beam. Specifically, under the premise that a pultruded sheet has a sufficient length to form a pultruded main beam, the thickness of the pultruded sheet is changed accordingly with the inner diameter of the inner cavity 2, so that its outer shape is the same as that of the pultruded main beam, thereby forming an integrated pultruded main beam. In this way, it is possible to distinguish the traditional stacking method by setting a pultruded sheet in the span direction of the wind turbine blade (i.e., the length direction of the pultruded sheet). The use of a pultruded sheet with a variable cross-section structure reduces the weight of the pultruded main beam when achieving thickness changes, avoiding the limitations caused by excessive stacking of pultruded sheets in the traditional structure. At the same time, the traditional stacking method of pultruded sheets is no longer used, and a single integral sheet can be directly used to achieve the laying of the pultruded main beam on the wind turbine blade.

[0046] Among them, when a pultruded plate forms an integrated pultruded main beam, the first constant diameter cavity section 201 and the second constant diameter cavity section 203 are smoothly connected through the variable diameter section 202 with a gradually changing inner diameter. While ensuring that the pultruded main beam can achieve a thickness change that matches the shape of the wind turbine blade along the span direction of the wind turbine blade, it can also reduce the structural weight of the area with larger thickness and optimize the mechanical properties of the connection position between the area with larger thickness and the area with smaller thickness.

[0047] In another preferred setting, multiple pultruded sheets are stacked to form a pultruded main beam, that is, multiple pultruded sheets whose thickness changes with the change of the inner diameter are stacked to form a pultruded main beam. This pultruded main beam forming method is different from the traditional method of stacking flat pultruded sheets to form a pultruded beam because the pultruded sheets are variable thickness sheets. The difference is that: first, because the pultruded sheets are hollow sheets with variable thickness, they can achieve improved mechanical properties while reducing weight, not only eliminating weight restrictions, but also optimizing the strength, stiffness, load-bearing performance and anti-buckling ability of the pultruded beam; in addition, because the pultruded sheets are variable thickness sheets, adjacent stacked pultruded sheets can be placed and stacked more reasonably according to the mutual matching between the shapes, which can also improve the mechanical properties of the pultruded beam.

[0048] Furthermore, the present application also provides a wind turbine blade, comprising a pultruded main beam, which is any of the pultruded main beams mentioned above.

[0049] Since the above-mentioned wind turbine blade includes a pultruded main beam, the beneficial effects of the wind turbine blade brought by the pultruded main beam can be found in the above content and will not be repeated here.

[0050] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0051] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0052] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0053] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0054] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0055] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A pultruded sheet, characterized in that: include: Plate body; An inner cavity is provided on the plate body and extends along the length direction of the plate body; In which, in the length direction, the inner cavity includes multiple cavity segments with different inner diameters; the inner cavity is a variable-section inner cavity; in the length direction, the inner diameters of the multiple cavity segments continuously increase from one end to the other end of the plate body; the multiple cavity segments include a first equal-diameter cavity segment and a second equal-diameter cavity segment, and a variable-diameter cavity segment located between the first equal-diameter cavity segment and the second equal-diameter cavity segment; the inner diameter of the first equal-diameter cavity segment is greater than the inner diameter of the second equal-diameter cavity segment, and the inner diameter of the variable-diameter cavity segment gradually changes to transitionally connect the first equal-diameter cavity segment and the second equal-diameter cavity segment; in the thickness direction of the plate body, the portion of the plate body that surrounds the inner cavity is the cavity wall portion; and, in the length direction, the thickness of the cavity wall portion remains unchanged, and the thickness of the plate body changes with the change of the inner diameter.

2. The pultruded sheet according to claim 1, characterized in that: In the cross section perpendicular to the length direction, one or more inner cavities are provided along the width direction of the plate body, and the cross-sectional shape of the inner cavity is a combination of one or more of a circle, an ellipse, a regular polygon, and an irregular polygon.

3. The pultruded sheet according to claim 2, characterized in that: In the width direction of the plate body, the inner cavity includes a plurality of cavities having the same cross-sectional shape.

4. A pultruded main beam, characterized in that: The pultruded plate comprises the pultruded plate according to any one of claims 1 to 3.

5. The pultruded main beam according to claim 4, characterized in that: The pultruded plate whose thickness changes with the change of the inner diameter forms an integral pultruded main beam.

6. The pultruded main beam according to claim 4, characterized in that: A plurality of pultruded sheets whose thicknesses vary with the inner diameter are stacked to form a pultruded main beam.

7. A wind turbine blade comprising a pultruded main beam, characterized in that: The pultruded main beam is the pultruded main beam according to any one of claims 4 to 6.

Images