Beam structure, wind power blade and wind generating set

Abstract

The invention relates to the technical field of wind power equipment, in particular to a beam structure, a wind power blade and a wind generating set. The beam structure comprises a beam body, the beam body comprises multiple sets of pultrusion units, the multiple sets of pultrusion units are sequentially arranged in the width direction of the beam body, each set of pultrusion unit comprises multiple pultrusion pieces, and the multiple pultrusion pieces are arranged in a stacked mode in the thickness direction of the beam body; wherein the beam body is provided with a first end portion and a second end portion which are opposite to each other in the length direction of the beam body, at least one side of the beam body in the width direction of the beam body is provided with a receding area, the receding area starts from the pultrusion unit, located on the outermost side in the width direction of the beam body, of the beam body and is arranged in a sunken mode towards the inner side, and the receding area extends to the second end portion in the length direction. According to the beam structure, the probability that the beam structure interferes with internal parts of the shell can be reduced, and therefore the production efficiency and the production quality of the wind power blade are improved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power equipment, and in particular to a beam structure, a wind power blade and a wind turbine generator set. Background Art

[0002] Wind turbine blades are used to capture wind energy and convert it into mechanical energy, which is then converted into electrical energy through the generator in the wind turbine. Wind turbine blades usually include a shell and a beam structure arranged on the shell. The beam structure is usually made of stacked pultruded plates to support the wind turbine blades.

[0003] In the related art, the pultruded beam structure usually extends from the root to the tip of the wind turbine blade. However, the pultruded beam structure is prone to interfere with internal components such as the skin core material in the shell, thereby affecting the production efficiency and production quality of the wind turbine blade. Summary of the invention

[0004] The present application provides a beam structure, a wind turbine blade and a wind turbine generator set, which are used to solve the problem that the beam structure is prone to interfere with internal components such as skin core materials in the shell, thereby affecting the production efficiency and production quality of the wind turbine blade.

[0005] In order to achieve the above purpose, the technical solution of this application is as follows:

[0006] In the first aspect, the present application provides a beam structure, comprising: a beam body, comprising a plurality of groups of pultruded units, the plurality of groups of pultruded units are arranged in sequence along the width direction of the beam body itself, each group of pultruded units comprises a plurality of pultruded parts, and the plurality of pultruded parts are stacked along the thickness direction of the beam body itself; wherein the beam body has a first end and a second end relative to each other along its own length direction, and a yield area is provided on at least one side of the beam body in its own width direction, the yield area starts from the pultruded unit located at the outermost side of the beam body in the width direction and is recessed inwardly, and the yield area extends to the second end in the length direction.

[0007] In a possible implementation, the beam structure provided by the present application has a beam body whose width in the yielding area tends to decrease along the length direction from the first end to the second end.

[0008] In one possible implementation, the beam structure provided by the present application further includes a flexible filler and a first reinforcement layer. The flexible filler is located in the make way area. The flexible filler is connected to at least a part of the pultruded units through the first reinforcement layer. The flexible filler is used to fill the make way area. The hardness of the flexible filler is less than the hardness of the pultruded part.

[0009] In a possible implementation, for the beam structure provided by the present application, along the thickness direction, a positioning protrusion is provided on one of every two adjacent pultruded members, and a positioning recess matching the positioning protrusion is provided on the other; and / or, it further includes a plurality of positioning members, and along the width direction, a positioning member is provided between every two adjacent groups of pultruded units.

[0010] In a possible implementation, for the beam structure provided by the present application, along the thickness direction, an interlayer reinforcement is provided between adjacent two layers of pultruded members.

[0011] In a possible implementation, for the beam structure provided by the present application, at least part of multiple groups of pultruded units are variable-width pultruded units, and at least part are equal-width pultruded units. The variable-width pultruded units are arranged on at least one side of the equal-width pultruded units in the width direction. Along the length direction, the length of the equal-width pultruded units is greater than the length of the variable-width pultruded units.

[0012] In a possible implementation, for the beam structure provided by the present application, it further includes a second reinforcement layer, and the second reinforcement layer is provided on the variable-width pultruded units and is arranged closer to the second end relative to the first end.

[0013] In a possible implementation, for the beam structure provided by the present application, the variable-width pultruded units are provided as at least two groups. The at least two groups of variable-width pultruded units are arranged on the same side of the equal-width pultruded units in the width direction, and along the length direction, the lengths of the respective variable-width pultruded units decrease in sequence along the direction away from the equal-width pultruded units; or, the at least two groups of variable-width pultruded units are respectively arranged on the opposite sides of the equal-width pultruded units in the width direction. Along the length direction, the lengths of the respective variable-width pultruded units on the same side decrease in sequence along the direction away from the equal-width pultruded units, and the lengths of the two variable-width pultruded units adjacent to the equal-width pultruded units are different.

[0014] In a possible implementation, for the beam structure provided by the present application, along the width direction and pointing from the outside to the inside of the beam body, the width of the variable-width pultruded units gradually decreases to form a first inclined surface on the variable-width pultruded units.

[0015] In a possible implementation, for the beam structure provided by the present application, along the width direction, the variable-width pultruded units have a maximum width of d, and the length of the first inclined surface is L1, where d / L1 is greater than or equal to 1 / 30 and less than or equal to 1 / 10.

[0016] In a possible implementation, for the beam structure provided in the present application, the beam body has opposite first and second surfaces in the thickness direction. The first surface is used to connect with the outer shell of the wind turbine blade. Along the direction from the second surface to the first surface, the lengths of the respective pultruded members corresponding to the variable-width pultrusion unit gradually decrease in the length direction, so as to form a second inclined surface on the variable-width pultrusion unit.

[0017] In a possible implementation, for the beam structure provided in the present application, along the thickness direction, the variable-width pultrusion unit has a maximum thickness h, and the length of the second inclined surface is L2, where h / L2 is greater than or equal to 1 / 200 and less than or equal to 1 / 50.

[0018] In a possible implementation, for the beam structure provided in the present application, the length of the interlayer reinforcement member corresponding to the variable-width pultrusion unit in the length direction is greater than the length of the pultruded member adjacent to the interlayer reinforcement member, so that each interlayer reinforcement member covers at least part of the second inclined surface.

[0019] In a possible implementation, for the beam structure provided in the present application, it further includes a third reinforcement layer, and the third reinforcement layer is laid on one side of the beam body in the thickness direction.

[0020] In a second aspect, the present application provides a wind turbine blade, including a blade outer shell, a web, and the above-mentioned beam structure. The beam structures are arranged in pairs on the blade outer shell, and the paired beam structures are connected by the web.

[0021] In a third aspect, the present application provides a wind power generation set, including the above-mentioned wind turbine blade.

[0022] For the beam structure, wind turbine blade, and wind power generation set provided in the present application, the beam structure includes a beam body, and the beam body includes multiple groups of pultrusion units. Each group of pultrusion units is arranged in sequence along the width direction of the beam body itself. Each group of pultrusion units includes multiple pultruded members, and the pultruded members are stacked along the thickness direction of the beam body itself. Among them, the beam body has opposite first and second ends along its own length direction. The first end is the end of the beam body closer to the blade root relative to the blade tip, and the second end is the end of the beam body closer to the blade tip relative to the blade root of the wind turbine blade. At least one side of the beam body in its own width direction is provided with a relief area. The relief area starts from the outermost pultrusion unit of the beam body in the width direction and is recessed inward, and the relief area extends to the second end in the length direction, so that the relief area is located in the area of the beam body closer to the blade tip relative to the blade root. Thus, the beam body can better adapt to the shape of the blade housing, reduce the probability of interference between the beam body and the internal components of the housing, and thereby improve the production efficiency and production quality of the wind turbine blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic of the beam structure provided by the embodiment of the present application Figure 1 ;

[0025] Figure 2 Structural schematic of the beam structure provided by the embodiment of the present application Figure 2 ;

[0026] Figure 3 Another perspective schematic of the beam structure provided by the embodiment of the present application Figure 1 ;

[0027] Figure 4 Another perspective schematic of the beam structure provided by the embodiment of the present application Figure 2 ;

[0028] Figure 5 Structural schematic of the beam body provided by the embodiment of the present application Figure 1 ;

[0029] Figure 6 Structural schematic of the beam body provided by the embodiment of the present application Figure 2 ;

[0030] Figure 7 Structural schematic of the beam body provided by the embodiment of the present application Figure 3 ;

[0031] Figure 8 Structural schematic of the beam body provided by the embodiment of the present application Figure 4 .

[0032] Explanation of reference numerals:

[0033] 10 - Beam structure;

[0034] 100 - Beam body;

[0035] 110 - Pultrusion unit; 111 - Pultruded part; 112 - Variable-width pultrusion unit; 112a - First variable-width pultrusion unit; 112b - Second variable-width pultrusion unit; 1121 - First inclined surface; 1122 - Second inclined surface; 1123 - First side; 1124 - Second side; 113 - Equal-width pultrusion unit; 113a - First equal-width pultrusion unit; 113b - Second equal-width pultrusion unit; 113c - Third equal-width pultrusion unit;

[0036] 120 - First end portion;

[0037] 130 - Second end portion;

[0038] 140 - First surface;

[0039] 150 - Second surface;

[0040] 160 - Relief area;

[0041] 200 - Flexible filling member;

[0042] 300 - First reinforcing layer;

[0043] X - Length direction; Y - Width direction; Z - Thickness direction.

[0044] Through the above - mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed description of the specific embodiments

[0045] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the preferred embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0046] It should be noted that in the description of the embodiments of the present application, the terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description, rather than indicating or implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0047] In addition, it should also be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In the related art, the pultruded beam structure usually extends from the root to the tip of the wind turbine blade. However, due to the structural characteristics of the wind turbine blade itself, the chord length of the blade shell gradually decreases from the root to the tip of the wind turbine blade. Therefore, in the tip area of ​​the wind turbine blade, the pultruded beam structure is prone to interfere with the skin core material and other internal components in the shell, thereby affecting the production efficiency and production quality of the wind turbine blade.

[0050] In view of this, the present application provides a beam structure, a wind turbine blade and a wind turbine generator set, wherein the beam structure includes a beam body, the beam body includes a plurality of pultrusion units, and each group of pultrusion units is arranged in sequence along the width direction of the beam body itself. Each group of pultrusion units includes a plurality of pultrusion parts, and each pultrusion part is stacked along the thickness direction of the beam body itself. The beam body has a first end and a second end relative to each other along its length direction, the first end is an end of the beam body close to the blade root relative to the blade tip, and the second end is an end of the beam body close to the blade tip relative to the blade root of the wind turbine blade. A clearance area is provided on at least one side of the beam body in its width direction, the clearance area starts from the pultrusion unit located at the outermost side of the beam body in the width direction and is recessed inwardly, and the clearance area extends to the second end in the length direction, so that the clearance area is located in the area of ​​the beam body close to the blade tip relative to the blade root, thereby the beam body can better adapt to the shape of the blade shell, reduce the probability of interference between the beam body and the internal components of the shell, and thus improve the production efficiency and production quality of the wind turbine blade.

[0051] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] See also Figure 1 , Figure 2 , Figure 5 and Figure 7, this application provides a beam structure 10. The beam structure 10 includes a beam body 100. The beam body 100 includes multiple pultrusion units 110. The multiple pultrusion units 110 are arranged in sequence along the width direction Y of the beam body 100 itself. Each pultrusion unit 110 includes multiple pultruded members 111. The multiple pultruded members 111 are stacked along the thickness direction Z of the beam body 100 itself. Among them, the beam body 100 has opposite first end 120 and second end 130 along its own length direction X. At least one side of the beam body 100 is provided with a relief area 160 in the width direction Y. The relief area 160 starts from the outermost pultrusion unit 110 of the beam body 100 in the width direction Y and is recessed inward. The relief area 160 extends to the second end 130 in the length direction X.

[0053] It should be noted that the width direction Y of the beam body 100 itself can be understood as matching the chord direction of the wind turbine blade, and the length direction X of the beam body 100 itself can be understood as matching the axial direction of the wind turbine blade.

[0054] In specific implementation, the beam body 100 has opposite first end 120 and second end 130 along its own length direction X. The first end 120 can be understood as the end of the beam body 100 closer to the root relative to the tip, and the second end 130 can be understood as the end of the beam body 100 closer to the tip relative to the root of the wind turbine blade. In order to improve the adaptability of the beam structure 10, a relief area 160 is provided starting from the outermost pultrusion unit 110 of the beam body 100 in the width direction Y and recessed inward. By setting the relief area 160, it can be avoided that the boundary of the beam body 100 exceeds the boundary of the blade shell. That is to say, such a setting can enable the beam body 100 to adapt to the chord length change of the wind turbine blade.

[0055] The relief area 160 is arranged on the beam body 100, and the relief area 160 extends to the second end 130 of the beam body 100 in the length direction X, ensuring that the beam structure 10 has higher adaptability in the tip region. With such a setting, the relief area 160 can accurately correspond to the gradually decreasing chord length of the blade shell in the region close to the tip, thereby effectively reducing the interference between the beam body 100 and other components inside the blade shell (such as the leading edge bonding angle, trailing edge lightning protection arrester, etc.). Thus, the beam body 100 can better adapt to the shape of the blade shell, effectively avoiding an increase in the production difficulty of the wind turbine blade due to interference problems, thereby improving the production efficiency and production quality of the wind turbine blade.

[0056] See Figures 5 to 8 , in some embodiments, along the length direction X and pointing from the first end 120 to the second end 130, the width of the beam body 100 in the relief area 160 shows a decreasing trend.

[0057] It is understandable that as the wind turbine blade extends from the blade root to the blade tip, its cross-sectional shape gradually changes, that is, in the area near the blade tip, the blade width gradually decreases to adapt to changes in wind force and airflow. In order to improve the adaptability of the beam body 100, the width of the beam body 100 in the clearance area 160 tends to decrease.

[0058] Optionally, the overall width of the multiple groups of pultrusion units 110 in the clearance area 160 may be gradually reduced, that is, the width of the beam body 100 in the clearance area 160 is gradually reduced by reducing the width of the pultrusion unit 110 itself. Alternatively, the pultrusion units 110 themselves are set to have equal widths, and the number of pultrusion units 110 gradually decreases in the clearance area 160 and along the width direction Y from the blade root to the blade tip, so that the width of the beam body 100 in the clearance area 160 is gradually reduced.

[0059] In specific implementation, starting from the first end 120 of the beam body 100, the width of the beam body 100 itself can be kept constant to ensure good cooperation with the blade shell and to ensure the structural strength and bearing capacity of the beam body 100 itself. As it extends toward the second end 130, the width of the beam body 100 in the clearance area 160 gradually decreases to adapt to the reduced chord length and increased curvature of the blade shell, thereby avoiding interference between the beam body 100 and other components inside the shell. This arrangement also ensures the stability and reliability of the beam structure 10 when bearing wind loads.

[0060] In addition, the width of the beam body 100 in the clearance area 160 tends to decrease, which can further optimize the weight distribution of the beam body 100, thereby improving the performance of the wind turbine blade.

[0061] See also Figure 1 and Figure 2 In some embodiments, a flexible filler 200 and a first reinforcement layer 300 are further included. The flexible filler 200 is located in the clearance area 160. The flexible filler 200 is connected to at least a part of the pultrusion units 110 through the first reinforcement layer 300. The flexible filler 200 is used to fill the clearance area 160. The hardness of the flexible filler 200 is less than the hardness of the pultrusion 111.

[0062] The flexible filler 200 is arranged in the clearance area 160, and the flexible filler 200 is used to connect with the beam body 100 and the blade shell to fill the gap between the beam body 100 and the blade shell, improve the structural strength of the wind turbine blade itself, and further improve the performance of the wind turbine blade. In order to achieve a stable connection between the flexible filler 200 and the pultrusion unit 110, the beam structure 10 can also be provided with a first reinforcement layer 300. The first reinforcement layer 300 can enhance the strength of the connection between the flexible filler 200 and the pultrusion unit 110, and can also ensure that the flexible filler 200 stably supports and fills the clearance area 160, thereby avoiding an excessively large gap between the beam body 100 and the blade shell.

[0063] Optionally, the flexible filler 200 may include balsa wood, polyvinyl chloride foam (PVC), polyethylene terephthalate foam (PET), etc. The flexible filler 200 can fit the shape and size of the gap between the beam body 100 and the blade shell, and effectively fill the space gap between the beam body 100 and the blade shell. Compared with the pultruded part 111, the flexible filler 200 has a lower hardness, so that the flexible filler 200 has good flexibility and adaptability, and is easy to cut or trim, so as to adapt to the gap between the beam body 100 and the blade shell.

[0064] In addition, the combination of the flexible filling member 200 and the first reinforcement layer 300 can further improve the overall stability and durability of the beam structure 10. Optionally, the first reinforcement layer 300 can include fiberglass fabric, and the first reinforcement layer 300 can transfer loads and increase the interface shear resistance, thereby extending the service life of the beam structure 10 and improving the safety of the beam structure 10.

[0065] The pultruded part 111 is a composite material prepared by a pultrusion molding process of fibers and resins in a mold, and may include a carbon fiber pultruded board, a glass fiber pultruded board, or a pultruded board made of a mixture of carbon fiber and glass fiber.

[0066] In some embodiments, along the thickness direction Z, one of every two adjacent pultrusions 111 is provided with a positioning protrusion, and the other is provided with a positioning recess that matches the positioning protrusion. Specifically, the positioning protrusion may be a convex block, and the positioning recess may be a groove, thereby facilitating the stacking of the pultrusions 111 when laying the pultrusions 111, and reducing the probability of stacking between the pultrusions 111, thereby improving production quality.

[0067] In other embodiments, a positioning member may be provided between two adjacent pultrusion units 110 along the width direction Y. Thus, when laying the pultrusions 111, the probability of stacking between the pultrusions 111 can be reduced, thereby improving the production quality. Optionally, the positioning member may include a T-shaped positioning member, an H-shaped positioning member, and the like.

[0068] In some embodiments, an interlayer reinforcement may be provided between two adjacent layers of pultrusions 111 along the thickness direction Z to improve the shear strength and anti-delamination capability between the layers of the pultrusions 111, thereby enhancing the overall structural strength and durability of the wind turbine blade. Optionally, the interlayer reinforcement may include glass fiber cloth.

[0069] See also Figure 1 and Figure 2 In some embodiments, at least part of the multiple groups of pultrusion units 110 are variable-width pultrusion units 112, and at least part of them are constant-width pultrusion units 113. The variable-width pultrusion units 112 are arranged on at least one side of the constant-width pultrusion units 113 in the width direction Y, and along the length direction X, the length of the constant-width pultrusion units 113 is greater than the length of the variable-width pultrusion units 112.

[0070] Among them, at least some of the pultrusion units 110 are configured as variable width pultrusion units 112, and at least some of the pultrusion units 110 are constant width pultrusion units 113. It can be understood that the width of the constant width pultrusion unit 113 is kept consistent from the first end 120 to the second end 130, and such a configuration can ensure the structural strength and bearing capacity of the beam body 100.

[0071] In specific implementation, the variable width pultrusion unit 112 is arranged on at least one side of the constant width pultrusion unit 113 in the width direction Y. In this way, the variable width pultrusion unit 112 can cooperate with the constant width pultrusion unit 113 to ensure the bearing effect of the beam body 100 itself and improve the structural strength of the wind turbine blade.

[0072] It should be noted that, along the length direction X, the length of the constant-width pultrusion unit 113 is greater than the length of the variable-width pultrusion unit 112, that is, the constant-width pultrusion unit 113 and the variable-width pultrusion unit 112 can be arranged flush with each other along the width direction Y at the first end 120, and the extension length of the variable-width pultrusion unit 112 extending from the first end 120 to the second end 130 is less than the extension length of the constant-width pultrusion unit 113, so that the overall width of the beam body 100 in the make way area 160 tends to decrease, thereby avoiding interference between the beam body 100 and other components inside the shell.

[0073] In addition, according to the structural characteristics of the wind turbine blade itself, the tip area of ​​the blade shell is pre-bent, the torsion angle is increased, and the curvature is increased compared to the root area. By setting the extension length of the variable width pultrusion unit 112 from the first end 120 to the second end 130 to be smaller than the extension length of the equal width pultrusion unit 113, the probability of stacking and gap increase between the pultrusion parts 111 in the tip area can be effectively reduced. That is to say, in the yield area 160, the curvature of the blade shell changes greatly. The length of the corresponding pultruded part 111 is shorter than that of the pultruded part 111 corresponding to the equal-width pultruded unit 113. Therefore, the variable-width pultruded unit 112 has stopped extending in the area where the blade curvature changes greatly, thereby effectively avoiding the problems of stacking and increased gap between the pultruded part 111 corresponding to the variable-width pultruded unit 112 and the pultruded part 111 corresponding to the equal-width pultruded unit 113, so that the beam body 100 can better fit with the blade shell, thereby reducing the production difficulty of wind turbine blades and improving production efficiency and production quality.

[0074] In some embodiments, the variable width pultrusion units 112 are arranged in at least two groups, and at least two groups of variable width pultrusion units 112 are arranged on the same side of the constant width pultrusion units 113 in the width direction Y, and along the length direction X, the length of each variable width pultrusion unit 112 decreases successively in the direction away from the constant width pultrusion unit 113.

[0075] It should be noted that the number of the variable width pultrusion units 112 is at least two groups, and the lengths of the variable width pultrusion units 112 decrease in sequence along the length direction X and in the direction away from the constant width pultrusion unit 113. Figure 5 and Figure 7 , taking five groups of pultrusion units 110 as an example, the five groups of pultrusion units 110 can be arranged in sequence as a first constant-width pultrusion unit 113a, a second constant-width pultrusion unit 113b, a third constant-width pultrusion unit 113c, a first variable-width pultrusion unit 112a, and a second variable-width pultrusion unit 112b. Thus, the first variable-width pultrusion unit 112a and the second variable-width pultrusion unit 112b are located on the same side of the constant-width pultrusion unit 113, and the first variable-width pultrusion unit 112a is arranged closer to the constant-width pultrusion unit 113 than the second variable-width pultrusion unit 112b. Along the length direction X, the lengths of the first equal-width pultrusion unit 113a, the second equal-width pultrusion unit 113b, and the third equal-width pultrusion unit 113c are the same, and the length of the first variable-width pultrusion unit 112a is greater than the length of the second variable-width pultrusion unit 112b, thereby achieving a decreasing width of the beam body 100 in the make way area 160.

[0076] In other embodiments, at least two groups of variable-width pultrusion units 112 are respectively arranged on opposite sides of the constant-width pultrusion unit 113 in the width direction Y, and along the length direction X, the length of each variable-width pultrusion unit 112 located on the same side gradually decreases in the direction away from the constant-width pultrusion unit 113, and the lengths of two variable-width pultrusion units 112 adjacent to the constant-width pultrusion unit 113 are different.

[0077] It should be noted that the lengths of the two variable width pultrusion units 112 adjacent to the constant width pultrusion unit 113 are different. Figure 6 and Figure 8 , the following is an example of five groups of pultrusion units 110, which can be sequentially arranged as a first variable width pultrusion unit 112a, a first equal width pultrusion unit 113a, a second equal width pultrusion unit 113b, a third equal width pultrusion unit 113c, and a second variable width pultrusion unit 112b. Thus, the first variable width pultrusion unit 112a and the second variable width pultrusion unit 112b are respectively located on both sides of the equal width pultrusion unit 113. Among them, along the length direction X, the lengths of the first equal width pultrusion unit 113a, the second equal width pultrusion unit 113b, and the third equal width pultrusion unit 113c are the same, and the length of the first variable width pultrusion unit 112a is less than the length of the second variable width pultrusion unit 112b, so as to realize that the width of the beam body 100 in the make way area 160 gradually decreases.

[0078] That is to say, the two variable-width pultrusion units 112 adjacent to the constant-width pultrusion unit 113 are set to different lengths, which can achieve a gradual reduction in the width of the beam body 100 in the make way area 160, thereby avoiding a sudden change in stiffness of the beam structure 10 and improving the performance of the beam structure 10.

[0079] See also Figure 1 , Figure 3 and Figure 6 In some embodiments, along the width direction Y and from the outer side of the beam body 100 to the inner side, the width of the variable width pultrusion unit 112 gradually decreases to form a first inclined surface 1121 on the variable width pultrusion unit 112 .

[0080] That is, the variable width pultrusion unit 112 may have a first side 1123 and a second side 1124 arranged opposite to each other in the width direction Y, wherein the first side 1123 may be arranged to be a side away from the constant width pultrusion unit 113 relative to the second side 1124, and the second side 1124 may be arranged to be a side close to the constant width pultrusion unit 113 relative to the first side 1123. In specific implementation, the gradual decrease in the width of the variable width pultrusion unit 112 may be understood as follows: along the length direction X, the length of the first side 1123 is less than the length of the second side 1124, and along the width direction Y, the first side 1123 and the second side 1124 are linearly or curvilinearly changed to form a first inclined surface 1121 on the variable width pultrusion unit 112, thereby realizing that the width of the variable width pultrusion unit 112 in the clearance area 160 gradually decreases. This arrangement can avoid the situation where the variable width pultrusion unit 112 has a sudden change in stiffness.

[0081] See also Figure 6 In some embodiments, along the width direction Y, the variable width pultrusion unit 112 has a maximum width, the maximum width is d, and the length of the first inclined surface 1121 is L1, wherein d / L1 is greater than or equal to 1 / 30 and less than or equal to 1 / 10.

[0082] It is understandable that the ratio between d and L1 is set between 1:10 and 1:30, including the two end values ​​of 1:10 and 1:30, and such a setting can ensure the structural strength of the variable width pultrusion unit 112. In addition, it helps to disperse and resist external forces, reduce local stress concentration, and thus improve the overall stability and durability of the beam structure 10.

[0083] If d / L1 is greater than 1 / 10, for example, d:L1 is set to 1:8, then the length L1 of the first slope 1121 is relatively short relative to the maximum width d, thereby increasing the probability of local stress concentration in the beam structure 10, causing the beam structure 10 to be more susceptible to local deformation or damage when subjected to stress.

[0084] If d / L1 is less than 1 / 30, for example, d:L1 is set to 1:35, the overall structural strength of the beam structure 10 is easily affected.

[0085] In other embodiments, a covering member may be provided. The covering member may include fiberglass cloth. The covering member covers at least a portion of the outer peripheral surface of the variable width pultrusion unit 112. Specifically, the covering member covers at least the first inclined surface 1121. Thereby, the structural strength and rigidity of the variable width pultrusion unit 112 are improved, and a sudden change in rigidity of the beam structure 10 in the variable width pultrusion unit 112 area is avoided.

[0086] See also Figure 2 and Figure 4, in some embodiments, the beam body 100 has opposite first surface 140 and second surface 150 in the thickness direction Z. The first surface 140 is used to connect with the outer shell of the wind turbine blade. Along the direction from the second surface 150 to the first surface 140, the lengths of the respective pultruded members 111 corresponding to the variable-width pultrusion unit 112 gradually decrease in the length direction X, so as to form a second inclined surface 1122 on the variable-width pultrusion unit 112.

[0087] It can be understood that along the direction from the second surface 150 to the first surface 140, the lengths of the respective pultruded members 111 gradually decrease, such that the variable-width pultrusion unit 112 is formed with a second inclined surface 1122. With such a setting, the variable-width pultrusion unit 112 can better adapt to the shape of the blade outer shell, reducing the probability of interference with the blade outer shell.

[0088] In addition, as the lengths of the respective pultruded members 111 gradually decrease in the length direction X, the second inclined surface 1122 can more effectively disperse and resist external forces, reducing the occurrence of local stress concentration phenomena and effectively avoiding the situation of stiffness mutation in the variable-width pultrusion unit 112.

[0089] See Figure 2 , in some embodiments, along the thickness direction Z, the variable-width pultrusion unit 112 has a maximum thickness h, and the length of the second inclined surface 1122 is L2, where h / L2 is greater than or equal to 1 / 200 and less than or equal to 1 / 50.

[0090] It should be noted that the ratio between h and L2 is set between 1:50 and 1:200, including the two end values of 1:50 and 1:200. With such a setting, the structural strength of the variable-width pultrusion unit 112 can be ensured. In addition, it helps to disperse and resist external forces, reducing local stress concentration, thereby improving the overall stability and durability of the beam structure 10.

[0091] If h / L2 is greater than 1 / 50, for example, setting h:L2 as 1:40, then relative to the maximum width h, the length L2 of the second inclined surface 1122 is relatively short. Thus, the probability of stiffness mutation in the beam structure 10 will increase. If h / L2 is less than 1 / 200, for example, setting h:L2 as 1:220, it is likely to affect the overall structural strength of the beam structure 10.

[0092] In some embodiments, the length of the interlayer strengthening member corresponding to the variable-width pultrusion unit in the length direction is greater than the length of the pultruded member adjacent to the interlayer strengthening member in the length direction, so that each interlayer strengthening member covers at least part of the second inclined surface.

[0093] In a specific implementation, in the area corresponding to the variable width pultrusion unit 112, the length of the interlayer reinforcement between two adjacent pultrusions 111 is greater than the shorter one of the two pultrusions 111. Thus, the portion of the interlayer reinforcement extending in the length direction X can cover the second inclined surface 1122, thereby strengthening the second inclined surface 1122 and reducing the probability of a sudden change in stiffness of the variable width pultrusion unit 112.

[0094] It should also be noted that, along the direction from the second surface 150 to the first surface 140, the length of each interlayer reinforcement in the length direction X gradually decreases to avoid multiple interlayer reinforcements from being stacked and covered on the second inclined surface 1122. In other words, the portion of each interlayer reinforcement extending in the length direction X can cover the second inclined surface 1122 corresponding to the corresponding pultruded component 111, thereby, each interlayer reinforcement can strengthen the second inclined surface 1122, and can also avoid the second inclined surface 1122 being partially stacked with multiple interlayer reinforcements, thereby avoiding stress concentration on the second inclined surface 1122, and reducing the risk of fatigue damage caused by stress accumulation during long-term use of the variable-width pultrusion unit 112.

[0095] In some embodiments, along the thickness direction Z, the pultrusion part 111 may be provided with a transition chamfer to allow the second inclined surface 1122 to transition smoothly.

[0096] It can be understood that by providing a transition chamfer, the stress concentration phenomenon that may be caused by a right-angle transition can be avoided, thereby extending the service life of the variable-width pultrusion unit 112.

[0097] In some embodiments, a second reinforcement layer is further included. The second reinforcement layer is disposed in the variable width pultrusion unit 112 , and the second reinforcement layer is disposed close to the second end 130 relative to the first end 120 .

[0098] It should be noted that since the width of the beam body 100 in the clearance area 160 tends to decrease, the stiffness of the beam structure 10 has a sudden change. Therefore, a second reinforcement layer can be provided on at least part of the variable width pultrusion unit 112 to enhance the overall strength of the beam structure 10.

[0099] Optionally, the second reinforcement layer may include fiberglass fabric. The second reinforcement layer may be disposed on at least one side of the first surface 140 and the second surface 150 .

[0100] In some embodiments, a third reinforcement layer is further included, and the third reinforcement layer is laid on one side of the beam body 100 along the thickness direction Z.

[0101] Exemplarily, the third reinforcement layer may include a pultruded sheet.

[0102] It should be noted that in order to make the beam structure 10 adapt to the shape of the blade shell, the beam structure 10 is provided with a clearance area 160. In specific implementation, the variable width pultrusion unit 112 can be formed by cutting the equal width pultrusion unit 113, or the variable width pultrusion unit 112 can be directly produced to form the clearance area 160. Therefore, compared with the traditional beam structure 10, the weight of the beam structure 10 provided in the present application is reduced. The traditional beam structure 10 is usually thin and has a buckling problem, that is, the geometric characteristics of the beam structure 10 suddenly change when it is subjected to an external load. The addition of a pultruded plate in the thickness direction Z of the traditional beam structure 10 will cause the weight of the beam structure 10 to be too large. Compared with the traditional beam structure 10, the beam structure 10 of the present application adds a third reinforcement layer in the thickness direction Z, which can be thicker than the traditional beam structure 10 when it has the same weight as the traditional beam structure 10, thereby reducing the probability of buckling.

[0103] Based on the above embodiments, an embodiment of the present application provides a wind turbine blade, including a blade shell, a web and the beam structure 10 of any of the above embodiments, the beam structures 10 are arranged in pairs on the blade shell, and the paired beam structures 10 are connected by the web.

[0104] The beam structure 10 has been described in detail in the above embodiments and will not be described again here.

[0105] It should be noted that when the beam structure 10 is arranged in a pair, the beam structure 10 can be understood as the main beam of the wind turbine blade, and the beam structures 10 arranged in pairs are connected by webs.

[0106] In other embodiments, the wind turbine blade may further include a pair of trailing edge auxiliary beams, which may also be connected by webs. The trailing edge auxiliary beams may adopt a traditional beam structure 10 or the beam structure 10 provided in the embodiment of the present application, which is not limited in the present application.

[0107] In addition, in other embodiments, the wind turbine blade may further include a pair of leading edge auxiliary beams, and the pair of leading edge auxiliary beams may also be connected by a web. Among them, the trailing edge auxiliary beam and the leading edge auxiliary beam may both adopt a traditional beam structure 10, or at least one of the trailing edge auxiliary beam and the leading edge auxiliary beam may adopt the beam structure 10 provided in the embodiment of the present application, and the present application is not limited here.

[0108] In specific implementation, the size of the beam structure 10 can be adjusted according to the structure of the wind turbine blade, so that the beam structure 10 can better adapt to the blade shell.

[0109] Based on the above embodiments, an embodiment of the present application provides a wind turbine generator set, including the wind turbine blades provided in the above embodiments.

[0110] Among them, the wind power blade has been described in detail in the above embodiments and will not be repeated here.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A beam structure, characterized in that: include: A beam body (100) comprising a plurality of groups of pultrusion units (110), wherein the plurality of groups of pultrusion units (110) are sequentially arranged along a width direction (Y) of the beam body (100), each group of pultrusion units (110) comprising a plurality of pultrusion pieces (111), and the plurality of pultrusion pieces (111) are stacked along a thickness direction (Z) of the beam body (100); The beam body (100) has a first end (120) and a second end (130) opposite to each other along its length direction (X), and a clearance area (160) is provided on at least one side of the beam body (100) in its width direction (Y). The clearance area (160) starts from the pultrusion unit (110) located at the outermost side of the beam body (100) in the width direction (Y) and is recessed inwardly. The clearance area (160) extends in the length direction (X) to at least one of the first end (120) and the second end (130).

2. The beam structure according to claim 1, characterized in that: Along the length direction (X) and from the first end (120) to the second end (130), the width of the beam body (100) in the clearance area (160) tends to decrease.

3. The beam structure according to claim 1, characterized in that: It also includes a flexible filling piece (200) and a first reinforcement layer (300), wherein the flexible filling piece (200) is located in the clearance area (160), and the flexible filling piece (200) is connected to at least a part of the pultrusion units (110) through the first reinforcement layer (300), and the flexible filling piece (200) is used to fill the clearance area (160), and the hardness of the flexible filling piece (200) is less than the hardness of the pultrusion piece (111).

4. The beam structure according to claim 1, characterized in that: Along the thickness direction (Z), one of every two adjacent pultruded parts (111) is provided with a positioning protrusion, and the other is provided with a positioning recess matching the positioning protrusion; And / or, it further comprises a plurality of positioning members, wherein the positioning members are arranged between each two adjacent groups of the pultrusion units (110) along the width direction (Y).

5. The beam structure according to any one of claims 1 to 4, characterized in that: An interlayer reinforcement member is provided between two adjacent layers of the pultruded parts (111) along the thickness direction (Z).

6. The beam structure according to claim 5, characterized in that: At least some of the multiple groups of pultrusion units (110) are variable-width pultrusion units (112), and at least some are constant-width pultrusion units (113). The variable-width pultrusion units (112) are arranged on at least one side of the constant-width pultrusion units (113) in the width direction (Y), and along the length direction (X), the length of the constant-width pultrusion units (113) is greater than the length of the variable-width pultrusion units (112).

7. The beam structure according to claim 6, characterized in that It also includes a second reinforcement layer, which is arranged in the variable width pultrusion unit (112), and the second reinforcement layer is arranged close to the second end (130) relative to the first end (120).

8. The beam structure according to claim 6, characterized in that: The variable width pultrusion units (112) are arranged in at least two groups; At least two groups of the variable-width pultrusion units (112) are arranged on the same side of the constant-width pultrusion unit (113) in the width direction (Y), and along the length direction (X), the length of each of the variable-width pultrusion units (112) decreases in sequence in a direction away from the constant-width pultrusion unit (113); Alternatively, at least two groups of the variable-width pultrusion units (112) are respectively arranged on two opposite sides of the constant-width pultrusion unit (113) in the width direction (Y), and along the length direction (X), the length of each of the variable-width pultrusion units (112) located on the same side gradually decreases in the direction away from the constant-width pultrusion unit (113), and the lengths of two variable-width pultrusion units (112) adjacent to the constant-width pultrusion unit (113) are different.

9. The beam structure according to claim 8, characterized in that: Along the width direction (Y) and from the outer side to the inner side of the beam body (100), the width of the variable width pultrusion unit (112) gradually decreases to form a first inclined surface (1121) on the variable width pultrusion unit (112).

10. The beam structure according to claim 9, characterized in that Along the width direction (Y), the variable width pultrusion unit (112) has a maximum width, the maximum width is d, and the length of the first inclined surface (1121) is L1, wherein d / L1 is greater than or equal to 1 / 30 and less than or equal to 1 / 10.

11. The beam structure according to claim 8, characterized in that The beam body (100) has a first surface (140) and a second surface (150) opposite to each other in the thickness direction (Z); the first surface (140) is used to connect to the outer shell of a wind turbine blade; along the direction from the second surface (150) to the first surface (140), the length of each pultruded component (111) corresponding to the variable width pultrusion unit (112) in the length direction (X) gradually decreases, so as to form a second inclined surface (1122) on the variable width pultrusion unit (112).

12. The beam structure according to claim 11, characterized in that Along the thickness direction (Z), the variable width pultrusion unit (112) has a maximum thickness, the maximum thickness is h, and the length of the second inclined surface (1122) is L2, wherein h / L2 is greater than or equal to 1 / 200 and less than or equal to 1 / 50.

13. The beam structure according to claim 11, characterized in that The length of the interlayer reinforcement corresponding to the variable width pultrusion unit (112) in the length direction (X) is greater than the length of the pultrusion (111) adjacent to the interlayer reinforcement, so that each interlayer reinforcement covers at least a portion of the second inclined surface (1122).

14. The beam structure according to any one of claims 1 to 4, characterized in that: It also includes a third reinforcement layer, which is laid on one side of the beam body (100) along the thickness direction (Z).

15. A wind turbine blade, characterized in that: It comprises a blade shell, a web and a beam structure (10) according to any one of claims 1 to 14, wherein the beam structures (10) are arranged in pairs on the blade shell, and the paired beam structures (10) are connected via the web.

16. A wind turbine generator set, characterized in that: Comprising the wind turbine blade as claimed in claim 15.

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