Strips, beams, blades, wind turbines for blades

Abstract

The present application discloses a strip for blades, a beam, a blade, and a wind turbine. The strip extends longitudinally and includes a first side surface and a second side surface arranged opposite to each other in the thickness direction; a third side surface and a fourth side surface arranged opposite to each other in the width direction; a first connecting surface connecting the first side surface and the third side surface, and a second connecting surface connecting the second side surface and the third side surface, so that the thickness of the strip between the first connecting surface and the second connecting surface gradually decreases toward the third side surface; a third connecting surface connecting the first side surface and the fourth side surface, and a fourth connecting surface connecting the second side surface and the fourth side surface, so that the thickness of the strip between the third connecting surface and the fourth connecting surface gradually decreases toward the fourth side surface, reducing the thickness of the two ends of the strip relative to the middle area in the width direction, so that after lamination, a gap is formed at the edge of the strip, which is conducive to the penetration of resin into the middle of the gap, solving the problem of poor resin impregnation between the plates.

Description

Technical Field

[0001] The present application belongs to the technical field of wind power generation materials, and in particular relates to a strip, beam, blade, and wind turbine generator set for blades. Background Art

[0002] The beam is the main load-bearing structure of the wind rotor blade. Figure 1 As shown, in the prior art, beams are manufactured using sheet materials 14 with a generally trapezoidal cross-section and a release sheet. The sheet materials are essentially strip-shaped. When the sheet materials 14 are stacked, the gap 140 formed between them, without the release sheet, is larger in the center and smaller at the ends. During the beam manufacturing process, this makes it difficult for resin to penetrate the gap 140 between adjacent sheet materials 14, resulting in poor impregnation between adjacent strip-shaped sheet materials 14 layers. This results in poor quality of the resulting beam and wind turbine blades.

[0003] Furthermore, during the pultrusion process, the wrinkles formed on the surface of the sheet material during release cloth extrusion can affect the strength of the sheet material. Release cloth is expensive and can easily leave residue during the production of sheets and beams. Using release cloth in the production of sheets and beams has a significant impact on the cost of both. Summary of the Invention

[0004] The purpose of the present application is to provide a strip-shaped member for blades, which is conducive to the uniform infiltration of resin into the gaps between the strip-shaped members as the plate material, reduces costs, and facilitates the production and manufacture of high-quality beams and wind turbine blades.

[0005] To this end, in a first aspect, the present application provides a strip for a blade, wherein the strip extends longitudinally thereof and comprises:

[0006] a first side surface and a second side surface disposed opposite to each other in the thickness direction;

[0007] A third side surface and a fourth side surface disposed opposite to each other in the width direction; and

[0008] a first connecting surface and a second connecting surface, wherein the first connecting surface connects the first side surface and the third side surface, and the second connecting surface connects the second side surface and the third side surface, so that the thickness of the strip gradually decreases between the first connecting surface and the second connecting surface toward the third side surface;

[0009] The third connecting surface and the fourth connecting surface, the third connecting surface connects the first side surface and the fourth side surface, and the second connecting surface connects the second side surface and the fourth side surface, so that the thickness of the strip between the third connecting surface and the fourth connecting surface gradually decreases toward the fourth side surface.

[0010] In the embodiment of the first aspect of the present application, the first connecting surface and the second connecting surface gradually decrease toward the center plane of the strip thickness direction, and the third connecting surface and the fourth connecting surface gradually decrease toward the center plane of the strip thickness direction.

[0011] In an embodiment of the first aspect of the present application, the first connecting surface and the second connecting surface are planes, and / or the third connecting surface and the fourth connecting surface are planes.

[0012] In an embodiment of the first aspect of the present application, the first connecting surface and the second connecting surface are curved surfaces, and / or the third connecting surface and the fourth connecting surface are curved surfaces.

[0013] In one embodiment of the first aspect of the present application, a cross-sectional curve of the first connecting surface on the cross section of the strip-shaped member satisfies the following conditions: a distance y from a point on the curve to the third side surface as a function of a distance x from a point on the curve to the first side surface is an upward convex function or a downward convex function; and / or

[0014] The cross-sectional curve of the second connecting surface on the cross section of the strip meets the following condition: the distance y from a point on the curve to the third side surface as a function of the distance x from a point on the curve to the second side surface is a convex function or a concave function.

[0015] In one embodiment of the first aspect of the present application, a cross-sectional curve of the third connecting surface on the cross section of the strip-shaped member satisfies the following conditions: a distance y from a point on the curve to the fourth side surface as a function of a distance x from a point on the curve to the first side surface is an upward convex function or a downward convex function; and / or

[0016] The cross-sectional curve of the fourth connecting surface on the cross section of the strip meets the following condition: the distance y from a point on the curve to the fourth side surface as a function of the distance x from a point on the curve to the second side surface is a convex function or a concave function.

[0017] In an embodiment of the first aspect of the present application, the above curve satisfies the following functional relationship:

[0018] y=log a x (1)

[0019] a is a real number ranging from 0.5 to 0.8, and the units of y and x are millimeters.

[0020] In an embodiment of the first aspect of the present application, the first side surface and / or the second side surface is a plane.

[0021] In an embodiment of the first aspect of the present application, the region formed between the first side surface and the second side surface has the same thickness.

[0022] In an embodiment of the first aspect of the present application, the first side surface and / or the second side surface is a curved surface.

[0023] In one embodiment of the first aspect of the present application, the first side surface and / or the second side surface is a smoothly transitioned arc surface, and the ratio of the thickness difference between the endpoints of the arc surface line at both ends and the high point of the arc surface to the total thickness between the first side surface and the second side surface is ≤10%.

[0024] In one embodiment of the first aspect of the present application, the third side surface and / or the fourth side surface is a plane.

[0025] In one embodiment of the first aspect of the present application, the third side surface and / or the fourth side surface is a curved surface.

[0026] In an embodiment of the first aspect of the present application, the strip has a width of 50 mm to 200 mm and a thickness of 2 mm to 10 mm.

[0027] In an embodiment of the first aspect of the present application, the strip-shaped member comprises fibers selected from glass fibers, carbon fibers, or a mixture of carbon fibers and glass fibers, and a resin or a cured product of a resin solution that impregnates the fibers.

[0028] In one embodiment of the first aspect of the present application, the resin is selected from epoxy resin, polyurethane resin, phenolic resin, unsaturated polyester resin or a combination thereof; the resin solution is selected from a composite solution of a toughening agent and a resin, and the toughening agent is selected from carboxyl liquid nitrile rubber, polyvinyl butyral, polyphenylene ether ketone, polyvinyl alcohol, polyvinyl acetate or a combination thereof.

[0029] The resin or resin solution is used to impregnate mixed fibers selected from carbon fibers, glass fibers or a combination thereof and is cured to form a strip-shaped member.

[0030] In one embodiment of the first aspect of the present application, the organic acid is selected from acrylic acid, methacrylic acid or a combination thereof.

[0031] In one embodiment of the first aspect of the present application, the carboxylated liquid butyl rubber includes structural units derived from butadiene, acrylonitrile and organic acid, wherein the mass fraction of the structural units derived from acrylonitrile of the toughening agent is 26% to 33%, the mass fraction of the structural units derived from butadiene is 18% to 30%, and the mass fraction of the structural units derived from organic acid is 20% to 35%.

[0032] In an embodiment of the first aspect of the present application, the mass of the toughening agent in the resin solution accounts for 5 wt.% to 25 wt.% of the mass of the resin solution.

[0033] In an embodiment of the first aspect of the present application, the molecular weight of the carboxyl liquid nitrile rubber is 6,000 to 10,000.

[0034] In one embodiment of the first aspect of the present application, the relative density of the carboxyl liquid nitrile rubber is 0.98 g / cm 3 ~0.99 g / cm3 .

[0035] In a second aspect, the present application provides a beam for a blade, comprising a plurality of strip groups arranged along a width direction, each strip group comprising a plurality of strips stacked and arranged along a thickness direction; the strips extend longitudinally thereof and comprise:

[0036] a first side surface and a second side surface disposed opposite to each other in the thickness direction; a third side surface and a fourth side surface disposed opposite to each other in the width direction; and

[0037] a first connecting surface and a second connecting surface, wherein the first connecting surface connects the first side surface and the third side surface, and the second connecting surface connects the second side surface and the third side surface, so that the thickness of the strip gradually decreases between the first connecting surface and the second connecting surface toward the third side surface;

[0038] a third connecting surface and a fourth connecting surface, wherein the third connecting surface connects the first side surface and the fourth side surface, and the second connecting surface connects the second side surface and the fourth side surface, so that the thickness of the strip-shaped member between the third connecting surface and the fourth connecting surface gradually decreases toward the fourth side surface;

[0039] The first connecting surface and the second connecting surface of each strip member in the strip member group along the thickness direction are arranged side by side to form a first curved tooth structure, and the third connecting surface and the fourth connecting surface of each strip member in the strip member group along the thickness direction are arranged side by side to form a second tooth structure; in the adjacent strip member groups along the width direction, the adjacent first tooth structures and second tooth structures are abutted against each other.

[0040] In an embodiment of the second aspect of the present application, ends of any four adjacent strip-shaped members in the adjacent strip-shaped member group along the width direction are arranged to form a gap that decreases from the middle toward both sides in the width direction.

[0041] In an embodiment of the second aspect of the present application, the cross section of the void is approximately rhombus-shaped in an orthographic projection view.

[0042] In an embodiment of the second aspect of the present application, interlayer cloth is arranged between adjacent strip-shaped members in the thickness direction.

[0043] In an embodiment of the second aspect of the present application, the interlayer fabric is a fiber braid, and the fibers are selected from glass fibers, carbon fibers, or a blend thereof.

[0044] In a third aspect, an embodiment of the present application provides a blade comprising the above-mentioned beam.

[0045] In a fourth aspect, an embodiment of the present application provides a wind turbine generator set comprising the above-mentioned blades.

[0046] The strip member of the embodiment of the present application is provided with a first side surface and a second side surface relative to each other in the thickness direction, a third side surface and a fourth side surface in the width direction, a first connecting surface connecting the first side surface and the third side surface, and a second connecting surface connecting the second side surface and the third side surface, so that the thickness of the strip member between the first connecting surface and the second connecting surface gradually decreases toward the third side surface; and a third connecting surface connecting the first side surface and the fourth side surface, and a second connecting surface connecting the second side surface and the fourth side surface, so that the thickness of the strip member between the third connecting surface and the fourth connecting surface gradually decreases toward the fourth side surface; so as to reduce the thickness of the two ends of the strip member in the width direction relative to the middle area, even if the strip member is thick in the middle and the thickness of the two side edges gradually decreases in the width direction, so that the strip member can form a gap at the edge of the strip member after being stacked in the thickness direction, and the gap facilitates the resin to penetrate and fill the middle of the gap between the strip members from the outside to the inside when making the main beam or the auxiliary beam, thereby reducing the occurrence of interlayer infusion defects and solving the problem of poor resin impregnation between the plate materials as strip members. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] Figure 1 It is a schematic diagram of the structure of the existing strip-shaped members after lamination;

[0049] Figure 2 It is a schematic diagram of the structure of an existing single strip;

[0050] Figure 3 This is a schematic structural diagram of a strip provided by one embodiment of the present application;

[0051] Figure 4 yes Figure 3 An enlarged view of the local structure A in FIG;

[0052] Figure 5 yes Figure 3 The cross-sectional curves of the first connecting surface 6a and / or the second connecting surface 6b and / or the third connecting surface 7a and / or the fourth connecting surface 7b need to satisfy the function curve;

[0053] Figure 6 This is a schematic structural diagram of the laminated strips provided in another embodiment of the present application;

[0054] Figure 7 This is a schematic structural diagram of the laminated strips provided in another embodiment of the present application;

[0055] Figure 8 yes Figure 7 An enlarged view of the local structure B in FIG;

[0056] Figure 9 Another embodiment of the present application includes an enlarged view of a local structure B of an interlayer fabric;

[0057] Figure 10 This is a schematic structural diagram of the third connecting surface and the fourth connecting surface of the strip-shaped member provided in another embodiment of the present application;

[0058] Figure 11 This is a schematic structural diagram of the third connecting surface and the fourth connecting surface of the strip-shaped member provided in another embodiment of the present application;

[0059] Figure 12 This is a schematic structural diagram of the third connecting surface and the fourth connecting surface of the strip-shaped member provided in another embodiment of the present application;

[0060] Figure 13 This is a schematic structural diagram of the third connecting surface and the fourth connecting surface of the strip-shaped member provided in another embodiment of the present application;

[0061] Figure 14 This is a schematic structural diagram of the third connecting surface and the fourth connecting surface of the strip-shaped member provided in another embodiment of the present application;

[0062] Figure 15 This is a schematic diagram of the reaction between the surface of the strip containing the toughening agent and the resin when the strip provided in the embodiment of the present application is used to make a beam.

[0063] Description of reference numerals:

[0064] 14. Plate; 140. Gap; 1. Strip; 100. Gap; 2. First side; 3. Second side; 4. Third side; 5. Fourth side; 6a. First connecting surface; 6b. Second connecting surface; 7a. Third connecting surface; 7b. Fourth connecting surface; 8. Gap; 9. Strip group; 10. First tooth structure; 11. Second tooth structure; 12. Interlayer fabric; T, thickness direction; W, width direction; Z, axial direction; T m , the center plane of the strip in the thickness direction; 13, the surface of the strip; α, the angle between the third connecting surface 7a and the fourth side surface 5 when the third connecting surface 7a is a plane. DETAILED DESCRIPTION

[0065] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0067] As mentioned in the background technology section, due to the limitation of production process, the release cloth cannot cover the edge of the pultruded plate. The release cloth is generally at a certain distance from the edge of the plate. Figure 2 As shown, after the release sheet is removed, the single sheet 14 has a dumbbell-shaped shape, thin in the middle and thicker at the sides. After stacking the multiple sheets 14, the gaps 140 between the upper and lower adjacent sheets form a structure with a larger center and narrower ends. During beam fabrication, it is difficult for the resin to penetrate from the narrow gaps 140 at the ends into the larger gap in the center, resulting in poor impregnation between the sheets and poor quality of the resulting beams and wind turbine blades.

[0068] In order to solve the problems in the prior art, the embodiment of the present application provides a strip-shaped member.

[0069] Figure 3 FIG. 1 shows a schematic structural diagram of a strip member for a blade provided by an embodiment of the present application. Figure 3 As shown, the strip 1 extends along its longitudinal direction Z and comprises:

[0070] A first side surface 2 and a second side surface 3 are arranged opposite to each other in the thickness direction T;

[0071] A third side surface 4 and a fourth side surface 5 are arranged opposite to each other in the width direction W; and

[0072] a first connecting surface 6a and a second connecting surface 6b, wherein the first connecting surface 6a connects the first side surface 2 and the third side surface 4, and the second connecting surface 6b connects the second side surface 3 and the third side surface 4, so that the thickness of the strip 1 between the first connecting surface 6a and the second connecting surface 6b gradually decreases toward the third side surface 4;

[0073] The third connecting surface 7a and the fourth connecting surface 7b, the third connecting surface 7a connects the first side surface 2 and the fourth side surface 5, and the second connecting surface 6b connects the second side surface 3 and the fourth side surface 5, so that the thickness of the strip 1 between the third connecting surface 7a and the fourth connecting surface 7b gradually decreases toward the fourth side surface 5.

[0074] In the embodiment of the first aspect of the present application, the first connecting surface 6a and the second connecting surface 6b are respectively oriented to the central plane T in the thickness direction T of the strip 1. m The third connecting surface 7a and the fourth connecting surface 7b are gradually reduced, and the third connecting surface 7a and the fourth connecting surface 7b are respectively toward the central plane T in the thickness direction T of the strip 1 m Gradually decrease.

[0075] The strip member of the embodiment of the present application is provided with a first side surface and a second side surface opposite to each other in the thickness direction, a third side surface and a fourth side surface are provided in the width direction, a first connecting surface is provided to connect the first side surface and the third side surface, and a second connecting surface is provided to connect the second side surface and the third side surface, so that the thickness of the strip member between the first connecting surface and the second connecting surface gradually decreases toward the third side surface; and a third connecting surface is provided to connect the first side surface and the fourth side surface, and a second connecting surface is provided to connect the second side surface and the fourth side surface, so that the thickness of the strip member between the third connecting surface and the fourth connecting surface gradually decreases toward the fourth side surface; so as to reduce the relative thickness of the two ends of the strip member in the width direction. As for the thickness of the middle area, even if the strip is thick in the middle and the thickness of the two side edges gradually decreases in the width direction, when two strips are stacked in the thickness direction and used to make beams, after the strips are stacked in the thickness direction, gaps with gradually decreasing openings from the outside to the inside are formed at both ends in the width direction. This gap facilitates the resin to penetrate and fill the middle of the gap between the strips from the outside to the inside when making beams, that is, the resin extends from the gap to the center of the strip in the width direction, which can effectively promote the resin to enter between the strips, improve the resin infusion efficiency, reduce the occurrence of interlayer infusion defects, and solve the problem of poor resin impregnation between the strips as plate materials.

[0076] like Figure 3 As shown, the cross-section of the strip 1 is a roughly constant cross-section defined by two bottom surfaces, the first side surface 2 and the third side surface 4, and two side surfaces, the third side surface 4 and the fourth side surface 5. Its shape is a long strip of composite material profile with gradually shrinking thickness at both ends and uniform thickness in the middle.

[0077] In an embodiment of the first aspect of the present application, the first connecting surface 6a and the second connecting surface 6b gradually decrease toward a plane Tm perpendicular to the thickness direction T of the strip 1. For example, the plane can be set at 1 / 4, 1 / 3, 1 / 2, 2 / 3 / , 3 / 4, or 4 / 5 between the thickness of the first side 2 and the third side 4. The plane is parallel to the first side 2 or the second side 3, and the first side 2 or the third side 4 is a plane.

[0078] like Figure 3 As shown, in the embodiment of the first aspect of the present application, the first connecting surface 6a and the second connecting surface 6b are respectively oriented to the central plane T in the thickness direction T of the strip 1. m The third connecting surface 7a and the fourth connecting surface 7b are gradually reduced, and the third connecting surface 7a and the fourth connecting surface 7b are respectively toward the central plane T in the thickness direction T of the strip 1 m Gradually decrease.

[0079] In an embodiment of the first aspect of the present application, Figure 10 、 13 As shown in Figures 14 and 15, the third connecting surface 7a and the fourth connecting surface 7b at the right end of the strip 1 in the width direction W are planes. In contrast, the first connecting surface 6a and / or the second connecting surface 6b at the left end of the strip 1 in the width direction W are planes.

[0080] In an embodiment of the first aspect of the present application, Figure 3 and 4 As shown, the first connecting surface 6a and the second connecting surface 6b are curved surfaces. Figure 11 and 12 As shown, the third connecting surface 7a and the fourth connecting surface 7b are / or curved surfaces.

[0081] In an embodiment of the first aspect of the present application, Figure 4 and 5 As shown, the cross-sectional curve of the first connecting surface 6a on the cross section of the strip meets the following conditions: the distance y from a point on the curve to the third side 4 as a function of the distance x from a point on the curve to the first side 2 is a convex function or a concave function.

[0082] In an implementation example of the first aspect of the present application, the cross-sectional curve of the second connecting surface 6b on the cross section of the strip-shaped member satisfies the following conditions: the distance y from a point on the curve to the third side 4 as a function of the distance x from a point on the curve to the second side 3 is a convex function or a concave function.

[0083] In other implementation examples of the first aspect of the present application, the first connecting surface 6a and the second connecting surface 6b may be simultaneously convex functions or concave functions; or the first connecting surface 6a is a convex function, and the second connecting surface 6b is a convex function; or the first connecting surface 6a is a convex function, and the second connecting surface 6b is a convex function.

[0084] In one embodiment of the first aspect of the present application, a cross-sectional curve of the third connecting surface 7a on the cross section of the strip-shaped member satisfies the following conditions: a distance y from a point on the curve to the fourth side surface 5 as a function of a distance x from a point on the curve to the first side surface 2 is an upward convex function or a downward convex function; and / or

[0085] The cross-sectional curve of the fourth connecting surface 7b on the cross section of the strip satisfies the following condition: the distance y from a point on the curve to the fourth side surface 5 as a function of the distance x from a point on the curve to the second side surface 3 is either a convex function or a concave function. The cross-sectional curves of the third and fourth connecting surfaces 7a, 7b are not shown in the drawings; their specific shapes can be referenced to those of the first connecting surface 6a.

[0086] In other implementation examples of the first aspect of the present application, the third connecting surface 7a and the fourth connecting surface 7b may be simultaneously convex functions or concave functions; or the third connecting surface 7a is a convex function, and the fourth connecting surface 7b is a convex function; or the third connecting surface 7a is a convex function, and the fourth connecting surface 7b is a convex function.

[0087] The first connecting surface 6a and / or the second connecting surface 6b, the third connecting surface 7a and / or the fourth connecting surface 7b form a transition area with a gradual thickness change at the upper and lower bottom edges of the strip-like members. The transition area adopts linear chamfers, circular chamfers and various curves to change the thickness, so that after the strips are stacked, gaps are formed at the edges in the width direction between the adjacent strips in the thickness direction, which is conducive to the resin penetrating through the gaps and filling the gaps between the strips.

[0088] In an embodiment of the first aspect of the present application, the cross-sectional curve satisfies the following functional relationship:

[0089] y=log a x (1)

[0090] a is a real number between 0.5 and 0.8, and the units of y and x are millimeters.

[0091] like Figure 5 As shown in FIG, when a takes different values, the curvature of the arc formed by the edge of the strip changes, so the value of a can be changed to control the size of the gap between the two strips.

[0092] In an embodiment of the first aspect of the present application, Figure 3 、 10 -14, the first side surface 2 and / or the second side surface 3 is a plane.

[0093] In an embodiment of the first aspect of the present application, the first side surface 2 and the second side surface 3 are planes, the area formed between the first side surface 2 and the second side surface 3 has equal thickness, and the edge thickness at both ends in the width direction gradually decreases.

[0094] In an embodiment of the first aspect of the present application, the first side surface 2 and / or the second side surface 3 is a curved surface.

[0095] In one embodiment of the first aspect of the present application, the first side surface 2 and / or the second side surface 3 is a smoothly transitioned arc surface, and the thickness difference between the endpoints of the arc surface line at both ends and the high point of the arc surface accounts for ≤10% of the total thickness between the first side surface 2 and the second side surface 3.

[0096] For example, taking a strip with a thickness of 5 mm and a width of 100 mm as an example, when the first side 2 and the second side 3 are curved surfaces, the thickness difference between the end points of the curved surface and the highest point of the curved surface is 0.2 mm, which accounts for 4% of the total thickness between the first side 2 and the second side 3.

[0097] In an embodiment of the first aspect of the present application, Figure 3 、 10 As shown in FIG. 13 , the fourth side surface 5 is a plane, the cross-sectional curve of the fourth side surface 5 is a straight line, and the angle α formed between the third connecting surface 7a and the fourth side surface 5 satisfies 0<α≤180. Exemplarily, α is 90°, 120°, or 150°. The third side surface 4 opposite the fourth side surface 5 can also be a plane, or the third side surface 4 alone can be a curved surface.

[0098] In an embodiment of the first aspect of the present application, Figure 14 As shown, the fourth side surface 5 is a curved surface, and its cross-sectional curve is an arc, and the third side surface 4 opposite to the fourth side surface 5 can also be a curved surface. Alternatively, the third side surface 4 can be a curved surface independently.

[0099] In an embodiment of the first aspect of the present application, the strip has a width of 50 mm to 200 mm and a thickness of 2 mm to 10 mm.

[0100] In an embodiment of the first aspect of the present application, the strip-shaped member comprises fibers selected from glass fibers, carbon fibers, or a mixture of carbon fibers and glass fibers, and a resin or a cured product of a resin solution that impregnates the fibers.

[0101] In one embodiment of the first aspect of the present application, the resin is selected from epoxy resin, polyurethane resin, phenolic resin, unsaturated polyester resin, or a combination thereof; the resin solution is selected from a composite solution of a toughening agent and resin, and the toughening agent is selected from carboxyl liquid nitrile rubber, polyvinyl butyral, polyphenylene ether ketone, polyvinyl alcohol, polyvinyl acetate, or a combination thereof. The carboxyl liquid nitrile rubber is a carboxyl liquid nitrile rubber having carboxyl groups at one end and / or both ends.

[0102] In an embodiment of the first aspect of the present application, the mass of the toughening agent in the resin solution accounts for 5 wt.% to 25 wt.% of the mass of the resin solution.

[0103] In one embodiment of the first aspect of the present application, the carboxylated liquid butyl rubber includes structural units derived from butadiene, acrylonitrile and organic acid, wherein the mass fraction of the structural units derived from acrylonitrile is 26% to 33%, the mass fraction of the structural units derived from butadiene is 18% to 30%, and the mass fraction of the structural units derived from organic acid is 20% to 35%.

[0104] In an embodiment of the first aspect of the present application, the molecular weight of the carboxyl liquid nitrile rubber is 6,000 to 10,000.

[0105] In one embodiment of the first aspect of the present application, the organic acid is selected from acrylic acid, methacrylic acid or a combination thereof.

[0106] In one embodiment of the first aspect of the present application, the relative density of the carboxyl liquid nitrile rubber is 0.98 g / cm 3 ~0.99 g / cm 3 .

[0107] An embodiment of the present application provides a method for manufacturing the aforementioned strip-shaped member for a blade, comprising:

[0108] Arranging fibers in a forming mold, wherein the forming mold has a forming cavity adapted to the shape of the strip;

[0109] Resin or resin solution is injected into a molding die provided with fibers for molding to obtain the strip-shaped member for blades.

[0110] In one embodiment of the second aspect of the present application, the step of injecting resin or resin solution into a molding mold provided with fibers to obtain the strip-shaped member for the blade includes using a resin solution compounded with a toughening agent.

[0111] During the molding process of the strips, a compounded resin solution containing a toughening agent is added to the mold to facilitate demolding of the molded strips. This results in a strip without a release cloth, eliminating the need for release cloth and oil-based release agents. Furthermore, the toughening agent-compounded resin solution forms chemical bonds and van der Waals forces on the surface of the resulting strips, enhancing the connection strength between the different strips.

[0112] This application adopts a release cloth-free solution. The surface of the strip of sheet material is no longer covered with release cloth, thus forming a release cloth-free strip. This avoids wrinkles on the strip surface during strip manufacturing, which could affect the strip's strength, and reduces the strength of the sheet material due to residual release cloth entering the interior of the sheet material. This saves the cost of using release cloth and reduces the frequency of surface defects on the strip. The release cloth removal process is also omitted during strip application, making the release cloth-free strip more cost-effective than strips with release cloth.

[0113] like Figure 15 As shown, the residual hydroxyl, carboxyl and other groups on the surface of the strip 13 made of the resin solution compounded with the toughening agent react with the silane coupling agent (RO)3Si-R 1 -CHCH2O、Epoxy resin OCH2CH-R 3 -CHCH2O and H2N-R 2 The NH2 curing agent reacts with the remaining hydroxyl groups on the strip surface 13, coupling with the -Si(OH)3 formed by the hydrolysis of the coupling agent. The epoxy groups of the silane coupling agent react with the amine curing agent in the infusion resin, and the curing reaction between the resins strengthens the connection strength between the strips and improves the quality of the beam and the wind rotor blade. The curing reaction temperature is 100°C to 150°C, and the curing time is 2 minutes to 10 minutes.

[0114] Carboxyl-based liquid nitrile rubber exhibits good compatibility with epoxy resin. The residual hydroxyl and carboxyl groups on the surface of the strips contain a large number of hydrogen bonds, with hydrogen bond energies ranging from 25 kJ / mol to 40 kJ / mol and chemical bond energies ranging from 180 kJ / mol to 250 kJ / mol. The interfacial forces between the strips are primarily hydrogen bonds and van der Waals forces. The toughening agent, introduced via organic acid into the carboxyl-based liquid nitrile rubber, increases its polarity and imparts high strength. Its tensile strength reaches 25.5 MPa to 26.5 MPa, its elongation at break is 310% to 380%, and its tear strength is 51.0 kN / m to 55.9 kN / m.

[0115] In a second aspect, the present application provides a beam for a blade, comprising a plurality of strip groups 9 arranged along a width direction W, each strip group comprising a plurality of strips stacked and arranged along a thickness direction; the strip 1 extends along its own longitudinal direction Z and comprises:

[0116] a first side surface 2 and a second side surface 3 disposed opposite to each other in the thickness direction T; a third side surface 4 and a fourth side surface 5 disposed opposite to each other in the width direction W; and

[0117] a first connecting surface 6a and a second connecting surface 6b, wherein the first connecting surface 6a connects the first side surface 2 and the third side surface 4, and the second connecting surface 6b connects the second side surface 3 and the third side surface 4, so that the thickness of the strip 1 between the first connecting surface 6a and the second connecting surface 6b gradually decreases toward the third side surface 4;

[0118] a third connecting surface 7a and a fourth connecting surface 7b, wherein the third connecting surface 7a connects the first side surface 2 and the fourth side surface 5, and the second connecting surface 6b connects the second side surface 3 and the fourth side surface 5, so that the thickness of the strip 1 between the third connecting surface 7a and the fourth connecting surface 7b gradually decreases toward the fourth side surface 5;

[0119] The first connecting surface 6a and the second connecting surface 6b of each strip member 1 in the strip member group 9 along the thickness direction T are arranged side by side to form a first tooth structure 10, and the third connecting surface 7a and the fourth connecting surface 7b of each strip member 1 in the strip member group 9 along the thickness direction T are arranged side by side to form a second tooth structure 11; in the strip member group 9 adjacent to each other along the width direction W, the adjacent first tooth structures 10 and the second tooth structures 11 are in contact with each other.

[0120] The beam is the main load-bearing structure of the wind rotor blade and is made of composite materials. The beam in the area with the maximum thickness of the airfoil is called the main beam, and the beam between the main beam and the trailing edge is called the secondary beam.

[0121] In an embodiment of the second aspect of the present application, any four adjacent strip members 1 in the adjacent strip member group 9 along the width direction W are arranged to form a gap 8 that decreases from the middle toward both sides in the width direction.

[0122] In an embodiment of the second aspect of the present application, the cross section of the gap 8 is approximately rhombus-shaped in an orthographic projection view.

[0123] In one embodiment of the second aspect of the present application, an interlayer cloth 12 is arranged between adjacent strips 1 in the thickness direction T, which is used to guide the resin to flow to the gaps 8 between the strips 1, so as to facilitate the resin to infiltrate the gaps 8 between the strips, reduce the risk of the gaps between the strips not being infiltrated, and enhance the strength of the beam.

[0124] In one embodiment of the second aspect of the present application, the interlayer fabric is a fiber braid, wherein the fibers are selected from glass fibers, carbon fibers, or a blend thereof. The interlayer fabric is a guide layer between layers of stacked strips to promote resin flow and impregnation of the strips.

[0125] An embodiment of the present application further provides a method for manufacturing a beam, comprising:

[0126] Providing the above-mentioned strip 1;

[0127] The strips 1 are stacked on a mold so that a plurality of the strips 1 are stacked and arranged in a thickness direction T to form a strip group 9. The plurality of strip groups 9 are arranged in a width direction W so that the first connecting surfaces 6 a and the second connecting surfaces 6 b of the strips 1 in adjacent strip groups 9 in the thickness direction T are arranged side by side to form a first tooth structure 10, and the third connecting surfaces 7 a and the fourth connecting surfaces 7 b of the strips 1 in the strip group 9 in the thickness direction T are arranged side by side to form a second tooth structure 11. In adjacent strip groups 9 in the width direction W, adjacent first tooth structures 10 and second tooth structures 11 abut against each other.

[0128] Supplying resin to the gaps 8 between the strip groups and the gaps 8 between adjacent strips in the thickness direction of the strip group;

[0129] The resin is cured to bond the strips together to produce the beam.

[0130] In one embodiment of the present application, the method for manufacturing the beam further includes:

[0131] The step of stacking the strips on the mold includes arranging interlayer cloth between adjacent strips in the thickness direction.

[0132] In a third aspect, an embodiment of the present application provides a blade comprising the above-mentioned beam, with the above-mentioned beam serving as the main load-bearing structure.

[0133] In a fourth aspect, an embodiment of the present application provides a wind turbine generator set comprising the above-mentioned blades.

[0134] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, reference can be made to the corresponding processes in the aforementioned method embodiments, which will not be described in detail here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or replacements within the technical scope disclosed in the present application, and such modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A strip for a blade, characterized in that: The strip (1) extends along its longitudinal direction (Z) and comprises: A first side surface (2) and a second side surface (3) arranged opposite to each other in a thickness direction (T); a third side surface (4) and a fourth side surface (5) disposed opposite to each other in the width direction (W); and a first connecting surface (6a) and a second connecting surface (6b), wherein the first connecting surface (6a) connects the first side surface (2) and the third side surface (4), and the second connecting surface (6b) connects the second side surface (3) and the third side surface (4), so that the thickness of the strip (1) between the first connecting surface (6a) and the second connecting surface (6b) gradually decreases toward the third side surface (4); a third connecting surface (7a) and a fourth connecting surface (7b), wherein the third connecting surface (7a) connects the first side surface (2) and the fourth side surface (5), and the fourth connecting surface (7b) connects the second side surface (3) and the fourth side surface (5), so that the thickness of the strip (1) between the third connecting surface (7a) and the fourth connecting surface (7b) gradually decreases toward the fourth side surface (5); The strip (1) comprises fibers selected from glass fibers, carbon fibers, or mixed fibers consisting of carbon fibers and glass fibers, and a solidified product of a resin solution impregnating the fibers, wherein the resin solution is a compound solution comprising a toughening agent and a resin.

2. The strip for blades according to claim 1, characterized in that: The first connecting surface (6a) and the second connecting surface (6b) are respectively oriented to the central plane (T) of the thickness direction (T) of the strip (1). m ) gradually decreases, the third connecting surface (7a) and the fourth connecting surface (7b) respectively move toward the central plane (T) of the thickness direction (T) of the strip (1) m ) gradually decreases.

3. The strip for blades according to claim 1, characterized in that: The first connecting surface (6a) and the second connecting surface (6b) are planes, and / or the third connecting surface (7a) and the fourth connecting surface (7b) are planes.

4. The strip for blades according to claim 1, characterized in that: The first connecting surface (6a) and the second connecting surface (6b) are curved surfaces, and / or the third connecting surface (7a) and the fourth connecting surface (7b) are curved surfaces.

5. The strip for blades according to claim 4, characterized in that: The cross-sectional curve of the first connecting surface (6a) on the cross section of the strip-shaped member satisfies the following conditions: the distance y from a point on the curve to the third side surface (4) as a function of the distance x from a point on the curve to the first side surface (2) is an upward convex function or a downward convex function; and / or The cross-sectional curve of the second connecting surface (6b) on the cross section of the strip-shaped member satisfies the following condition: the distance y from a point on the curve to the third side surface (4) as a function of the distance x from a point on the curve to the second side surface (3) is a convex function or a concave function.

6. The strip for blades according to claim 4, characterized in that: The cross-sectional curve of the third connecting surface (7a) on the cross section of the strip-shaped member satisfies the following conditions: the distance y from a point on the curve to the fourth side surface (5) as a function of the distance x from a point on the curve to the first side surface (2) is an upward convex function or a downward convex function; and / or, The cross-sectional curve of the fourth connecting surface (7b) on the cross section of the strip-shaped member satisfies the following condition: the distance y from a point on the curve to the fourth side surface (5) as a function of the distance x from a point on the curve to the second side surface (3) is an upward convex function or a downward convex function.

7. The strip for blades according to claim 5 or 6, characterized in that The curve satisfies the following functional relationship: y=log a x (1), a is a real number ranging from 0.5 to 0.8, where the units of y and x are millimeters.

8. The strip for blades according to any one of claims 1 to 6, characterized in that: The first side surface (2) and / or the second side surface (3) are planes.

9. The strip for blades according to any one of claims 1 to 6, characterized in that: The first side surface (2) and / or the second side surface (3) are curved surfaces.

10. The strip for blades according to claim 9, characterized in that The first side surface (2) and / or the second side surface (3) are arc surfaces with smooth transitions, and the ratio of the thickness difference between the end points of the arc surface line at both ends and the highest point of the arc surface to the total thickness of the first side surface (2) and the second side surface (3) is ≤10%.

11. The strip for blades according to any one of claims 1 to 6, characterized in that: The third side surface (4) and / or the fourth side surface (5) are planes.

12. The strip for blades according to any one of claims 1 to 6, characterized in that: The third side surface (4) and / or the fourth side surface (5) are curved surfaces.

13. The strip for blades according to any one of claims 1 to 6, characterized in that: The strip (1) has a width of 50 mm to 200 mm and a thickness of 2 mm to 10 mm.

14. The strip for blades according to claim 1, characterized in that The resin is selected from epoxy resin, polyurethane resin, phenolic resin, unsaturated polyester resin or a combination thereof; the toughening agent is selected from carboxyl liquid nitrile rubber, polyvinyl butyral, polyphenylene ether ketone, polyvinyl alcohol, polyvinyl acetate or a combination thereof.

15. The strip for blades according to claim 1, characterized in that The mass of the toughening agent in the resin solution accounts for 5 wt.% to 25 wt.% of the mass of the resin solution.

16. The strip for blades according to claim 14, characterized in that The toughening agent is a carboxyl liquid nitrile rubber, which includes structural units derived from butadiene, acrylonitrile and an organic acid, and the organic acid is selected from acrylic acid, methacrylic acid or a combination thereof; wherein the mass fraction of the structural units derived from the acrylonitrile of the toughening agent is 26% to 33%, the mass fraction of the structural units derived from the butadiene is 18% to 30%, and the mass fraction of the structural units derived from the organic acid is 20% to 35%.

17. A beam for a blade, characterized in that The invention comprises a plurality of strip groups (9) arranged along a width direction (W), each of the strip groups (9) comprising a plurality of strips (1) for blades according to any one of claims 1 to 16 stacked and arranged along a thickness direction (T); The first connecting surface (6a) and the second connecting surface (6b) of each of the strip-shaped members (1) in the strip-shaped member group (9) along the thickness direction (T) are arranged side by side to form a first tooth-shaped structure (10), and the third connecting surface (7a) and the fourth connecting surface (7b) of each of the strip-shaped members (1) in the strip-shaped member group (9) along the thickness direction (T) are arranged side by side to form a second tooth-shaped structure (11); in the strip-shaped member group (9) adjacent to each other along the width direction (W), adjacent first tooth structures (10) and second tooth structures (11) are in contact with each other.

18. The beam according to claim 17, characterized in that The ends of any four adjacent strip-shaped members (1) in the adjacent strip-shaped member group (9) along the width direction (W) are arranged to form a gap (8) that decreases from the middle to both sides.

19. The beam according to claim 18, characterized in that The cross section of the void (8) is approximately rhombus-shaped in orthographic projection.

20. The beam according to any one of claims 17 to 19, characterized in that Interlayer fabrics (12) are arranged between the adjacent strip-shaped members (1) in the thickness direction (T), and the interlayer fabrics (12) are selected from fiber braids of glass fiber, carbon fiber, or a blend thereof.

21. A blade, characterized in that: Comprising the beam according to any one of claims 17-20.

22. A wind turbine generator system, characterized in that: Comprising a blade as claimed in claim 21.

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