Wind power blade and wind wheel

Abstract

The utility model relates to the technical field of wind power equipment, and provides a wind power blade and a wind wheel, and the wind power blade comprises a shell, a beam cap and a core material. Wherein the number of the shells is two, the two shells are oppositely arranged and are sequentially connected end to end, a notch is formed in at least one shell, and the beam cap is connected with the shell through the notch in the shell. The beam cap comprises at least two carbon fiber pultrusion plates which are stacked in the thickness direction of the shell, and the contour shape formed by the at least two carbon fiber pultrusion plates is matched with the extending contour of the corresponding shell. Each carbon fiber pultrusion plate is provided with a first cavity, the first cavities are filled with core materials, and the density of the core materials is smaller than 2.5 g / cm. Through the arrangement, redundant materials in manufacturing of the blade can be eliminated, the weight and cost of the beam cap are reduced, the weight of the blade can be reduced, and the transportation and installation cost of the blade is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power equipment, in particular to a wind power blade and a wind wheel. BACKGROUND

[0002] With the increase of single machine capacity of wind turbine, the size and weight of wind turbine blade also increase significantly. The existing blade mostly adopts solid composite material structure, which can meet the strength requirement, but the weight of the blade is large, thereby leading to high cost of blade transportation and installation. Moreover, the load requirement of the wind wheel hub and main shaft is more severe due to the increase of the weight of the blade. Therefore, a lightweight design is needed to reduce the overall weight of the blade. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a wind power blade and a wind wheel to solve the problem of large weight of the wind power blade in the prior art, high cost of blade transportation and installation.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The first aspect of the present application provides a wind power blade, comprising: two shells, the two shells are oppositely arranged and sequentially connected in head-to-tail manner, at least one of the two shells has at least one notch; a beam cap is arranged at the notch and connected with the corresponding shell, one notch corresponds to one beam cap; the beam cap comprises at least two carbon fiber pultrusion plates which are stacked along the thickness direction of the shell, and the contour shape formed by the at least two carbon fiber pultrusion plates matches the extension contour of the corresponding shell; each carbon fiber pultrusion plate has a first cavity; a core material is filled in the first cavity, and the density of the core material is less than 2.5 g / cm³.

[0006] As an optional implementation, the core material is an aluminum alloy core material, and the core material has a plurality of spaced gaps, and the ratio of the total volume of the plurality of gaps in the core material to the total volume of the core material is 80% to 95%.

[0007] As an optional implementation, the two shells jointly form a receiving cavity, and the beam cap is arranged on each of the two shells, one beam cap on one of the two shells is oppositely arranged with one beam cap on the other; wherein the distance between the oppositely arranged two beam caps is greater than the distance between the inner walls of the two shells; the blade further comprises at least one support, the support is arranged in the receiving cavity and supported between the oppositely arranged two beam caps, wherein the support has a second cavity.

[0008] As an optional implementation, the support further comprises a filling layer, the filling layer is filled in the second cavity, and the filling layer is any one of a foam material or a balsa wood.

[0009] As an optional implementation, the connection of the two shells forms a leading edge and a trailing edge; the support member comprises a first support member and a second support member, the first support member and the second support member are arranged in a spaced manner along the direction from the leading edge to the trailing edge; wherein the first support member is close to the leading edge, the second support member is close to the trailing edge, and the thickness of the first support member is greater than the thickness of the second support member.

[0010] As an optional implementation, the support member comprises at least two protrusions and at least one recess, the at least two protrusions and the at least one recess are arranged alternately in sequence along the extension direction of the support member.

[0011] As an optional implementation, at least one of the two shells is provided with at least one lightening hole, the shell has a tip end and a root end, and the at least one lightening hole is arranged on the side of the shell close to the tip end.

[0012] As an optional implementation, the maximum hole size of the lightening hole is 25% to 40% of the minimum thickness size of the shell; and / or, the shell is provided with at least two lightening holes arranged in a spaced manner, and the ratio of the hole distance between the adjacent two lightening holes to the maximum hole size of the lightening hole is 3:1 to 5:1; and / or, the shell is provided with at least two lightening holes arranged in a spaced manner, and the ratio of the distance between the axis of the lightening hole close to the root end and the tip end to the distance from the tip end to the root end is 2:1 to 3:1.

[0013] As an optional implementation, the ratio of the distance between the lightening hole and the beam cap to the maximum hole size of the lightening hole is greater than or equal to 10; and / or, the edge of the lightening hole is further provided with a fiber layer, the fiber layer is provided with at least two layers, and the at least two layers of the fiber layer are arranged in an interleaved manner; and / or, the shape of the lightening hole can be circular, elliptical or regular hexagonal.

[0014] The second aspect of the present application provides a wind wheel, comprising: a main shaft, a hub and the wind power blade of any one of the above; wherein the wind power blade is connected to the hub; the main shaft is connected to the hub and can rotate under the drive of the hub.

[0015] The wind power blade and the wind wheel provided by the present application, the wind power blade comprises a shell, a beam cap and a core material. Wherein, the shell is provided with two, the two shells are oppositely arranged and sequentially connected in head-to-tail manner, at least one shell is provided with a notch, the beam cap is connected with the shell through the notch on the shell. The beam cap comprises at least two carbon fiber pultrusion plates arranged in a stacked manner along the thickness direction of the shell, and the contour shape formed by the at least two carbon fiber pultrusion plates matches the extension contour of the corresponding shell. Each carbon fiber pultrusion plate has a first cavity, and the first cavity is filled with a core material, and the density of the core material is less than 2.5 g / cm³.

[0016] In this configuration, the beam cap embedded in the shell is formed by at least two stacked carbon fiber pultruded plates. Compared to traditional vacuum-infused fiberglass beam caps, the specific strength (strength / density) and specific modulus (elastic modulus / density) of the beam cap formed by carbon fiber pultruded plates are significantly superior to those of fiberglass beam caps. Therefore, while ensuring the same mechanical properties, the thickness of the beam cap can be significantly reduced, thereby eliminating redundant material and reducing blade weight. Simultaneously, by creating cavities in the carbon fiber pultruded plates and filling these cavities with a core material having a lower density than traditional fiberglass, the weight and cost of the beam cap are further reduced while maintaining blade stiffness, thus reducing blade weight and lowering blade transportation and installation costs. Furthermore, the weight reduction of the blade can also lead to a simultaneous reduction in the weight of components such as the hub, tower, and foundation piles, achieving a lightweight design for the wind turbine and wind turbine unit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the internal structure of a cross-section of a wind turbine blade provided in an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the carbon fiber pultruded sheet provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the structure of one of the housings provided in an embodiment of this application;

[0021] Figure 4 This is a partial structural schematic diagram of the support member provided in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the structure of a wind turbine blade provided in an embodiment of this application;

[0023] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0024] Figure 7 This is a schematic diagram of the wind turbine structure provided in an embodiment of this application;

[0025] Figure 8 This is a connection diagram of a wind turbine provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10 - wind turbine blade; 11 - root end; 12 - tip end; 13 - leading edge; 14 - trailing edge;

[0028] 100 - shell; 110 - lightening hole;

[0029] 200 - beam cap; 210 - core material; 220 - plate body;

[0030] 300 - support; 310 - first support; 320 - second support; 330 - protrusion; 340 - recess;

[0031] 20 - hub;

[0032] 30 - main shaft;

[0033] 40 - generator;

[0034] 50 - tower. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. The embodiments described below and the features in the embodiments can be combined with each other without conflict, if possible.

[0036] In the prior art, the beam cap is a core load-bearing component in the wind turbine blade. The forming process of the beam cap takes the vacuum infusion of glass fiber laying and reinforced epoxy resin (GFRP) as the core, and finally forms an integral blade together with the shell through layered laying, resin infiltration and curing.

[0037] However, with the increase of the single machine capacity of the wind turbine generator, the thickness of the traditional glass steel beam cap will be significantly increased due to the requirement of rigidity, which in turn leads to a significant increase in the size and weight of the wind turbine blade. Thus, the transportation and installation cost of the blade is increased. Moreover, with the increase of the weight of the blade, the load requirement of the hub and the main shaft of the wind wheel is more severe.

[0038] In order to overcome the defects in the prior art, the application provides a wind power blade and a wind wheel. The wind power blade comprises a shell, a beam cap and a core material. The shell is provided with two shells which are oppositely arranged and sequentially connected in head-to-tail mode. At least one shell is provided with a notch, and the beam cap is connected with the shell through the notch on the shell. The beam cap comprises at least two carbon fiber pultrusion plates which are stacked along the thickness direction of the shell. The contour shape formed by the at least two carbon fiber pultrusion plates matches the extension contour of the corresponding shell. Each carbon fiber pultrusion plate has a first cavity, and the first cavity is filled with a core material. The density of the core material is less than 2.5 g / cm³.

[0039] In this way, the beam cap embedded in the shell is formed by the at least two carbon fiber pultrusion plates which are stacked. Compared with the traditional vacuum infusion glass fiber reinforced plastic beam cap, the specific strength (strength / density) and the specific modulus (elastic modulus / density) of the beam cap formed by the carbon fiber pultrusion plate are obviously better than those of the glass fiber beam cap. Therefore, under the premise of ensuring the same mechanical properties, the thickness of the beam cap can be significantly reduced, so that the redundant material can be eliminated and the weight of the blade can be reduced. At the same time, by arranging the cavity in the carbon fiber pultrusion plate and filling the core material with a density less than that of the traditional glass fiber in the cavity, the stiffness of the blade is ensured, and the weight and cost of the beam cap are further reduced, thereby reducing the weight of the blade and reducing the transportation and installation cost of the blade. In addition, the weight reduction of the blade can also drive the synchronous weight reduction of the hub, the tower, the pile foundation and other components, so as to realize the lightweight design of the wind wheel and the wind turbine.

[0040] The content of the application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and specifically understand the content of the application.

[0041] Figure 1 The internal structure schematic diagram of the cross section of the wind power blade provided by the embodiment of the application. Figure 2 The structure schematic diagram of the carbon fiber pultrusion plate provided by the embodiment of the application. Figure 3 The structure schematic diagram of one of the shells provided by the embodiment of the application. It can be understood that, the X direction refers to the length direction of the blade, i.e. the axial extension direction from the blade root end 11 (one end connected with the hub 20) to the blade tip end 12 (the free end), which is also called the blade span direction. The Y direction refers to the width direction of the blade, i.e. the straight line direction from the blade leading edge 13 to the trailing edge 14, which is also called the blade chord direction. The Z direction is the thickness direction of the blade, which can also be called the thickness direction of the shell 100.

[0042] Reference Figures 1-3As shown, this application embodiment provides a wind turbine blade 10, including two housings 100, a beam cap 200, and a core material 210. The two housings 100 are arranged opposite each other and connected end-to-end. At least one housing 100 has a notch for accommodating the beam cap 200. The beam cap 200 can be disposed at the notch on the housing 100 and connected to the corresponding housing 100 through the notch. The beam cap 200 can be used to bear bending loads on the blade.

[0043] Specifically, the beam cap 200 may include components along the shell thickness direction (see...). Figure 1 At least two carbon fiber pultruded plates are stacked in the Z direction. The contour shape formed by the at least two carbon fiber pultruded plates matches the extended contour of the corresponding shell 100. Each carbon fiber pultruded plate has a first cavity, into which core material 210 can be filled. The density of the core material 210 is less than 2.5 g / cm³.

[0044] For example, the core material 210 can be foam materials such as PVC (polyvinyl chloride) foam, PET (polyethylene terephthalate) foam and PMI (polymethacrylimide) foam, or it can be balsa wood, or it can be a composite material such as aluminum alloy honeycomb core material 210 and aramid honeycomb core material 210, or it can be any combination of the above different materials. No specific limitation is made on its type here.

[0045] With this configuration, the beam cap embedded in the shell is formed by at least two stacked carbon fiber pultruded plates. Compared with the traditional vacuum-infused fiberglass beam cap, the beam cap formed by carbon fiber pultruded plates has a significantly better specific strength (strength / density) and specific modulus (elastic modulus / density) than the fiberglass beam cap. Therefore, while ensuring the same mechanical properties, the thickness of the beam cap can be significantly reduced, thereby eliminating redundant materials and reducing the weight of the blade.

[0046] Meanwhile, by creating cavities in the carbon fiber pultruded plate and filling the cavities with low-density core material 210, the overall rigidity is ensured while further reducing the weight and cost of the beam cap, thereby reducing the transportation and installation costs of the blades. Furthermore, the weight reduction of the blades can also lead to the simultaneous weight reduction of components such as the hub 20, tower 50, and pile foundation, resulting in a lightweight design for the wind turbine and wind turbine unit.

[0047] Since the blade root end 11 is the part where the blade connects to the hub 20, it needs to withstand huge bending moments and tensile forces. The housing 100 is close to the blade root end 11 (see...). Figure 3 The thickness on one side of the shell 100 near the blade tip 12 (see...) Figure 3The thickness on one side is increased. This design provides higher strength and stiffness, ensuring that the blade will not be damaged by excessive stress under high wind speeds and complex wind conditions. At the same time, the increased thickness at the blade root tip 11 helps to improve the structural stability of the blade, reduce vibration and swaying during operation, and enhance the blade's wind resistance and operational reliability.

[0048] It is understood that the shell 100 can be made of carbon fiber pultruded plate material, traditional glass fiber fabric material, or a combination of carbon fiber pultruded plate and glass fiber fabric, without making specific limitations here.

[0049] It should be noted that when only one housing 100 has a notch connected to the beam cap 200, a reinforcing structure can be provided at the corresponding position on the other housing 100 to enhance the strength of the housing 100 itself. This will not affect the blade strength.

[0050] The beam cap 200 can be along the length of the blade (see...) Figures 1-3 Extending in the X direction (as one implementation), the beam cap 200 can be formed by connecting multiple carbon fiber pultruded plates along the length of the blade. Furthermore, the multiple carbon fiber pultruded plates can be segmented and spliced ​​according to the blade curvature to ensure the overall continuity of the beam cap 200. This reduces the requirements for the pultrusion plate production line and decreases process modification costs. Moreover, as the blade length increases, integral pultruded plates are easily limited by material properties and production processes; segmented design can overcome size bottlenecks through modular splicing, meeting the demands for lightweighting and large-scale production.

[0051] It is understandable that the carbon fiber pultruded sheets can be connected by structural adhesive, mechanical interlocking (such as dovetail joints, T-joints, tenon and mortise joints, and mixed joints, etc., and no specific restrictions are made on the connection method here).

[0052] Reference Figure 2 As shown, a carbon fiber pultruded sheet may include a sheet body 220 and a core material 210. A first cavity is disposed within the sheet body 220, and the core material 210 fills the first cavity within the sheet body 220. In one embodiment, the core material 210 may be an aluminum alloy core material 210, and the core material 210 has multiple spaced-apart gaps. The connection between the core material 210 and the sheet body 220 can be achieved through adhesive bonding, mechanical connection, or other methods, without specific limitations. Specifically, the aluminum alloy core material may be configured as a hexagonal honeycomb structure aluminum alloy core material.

[0053] Because aluminum alloy itself has high strength, and the aluminum alloy core material 210 has multiple spaced gaps, the density of the core material 210 is reduced. When filling the first cavity, the overall stiffness of the carbon fiber pultruded plate can be maintained and the corresponding weight can be reduced.

[0054] In some embodiments, the ratio of the total volume of the plurality of voids in the aluminum alloy core material to the total volume of the aluminum alloy core material can be 80% to 95%, for example, the ratio of the total volume of the plurality of voids in the aluminum alloy core material to the total volume of the aluminum alloy core material can be 80%, 82%, 85%, 87%, 89%, 91%, 93%, 95%, or a range between any two of them.

[0055] In this way, the weight of the blade can be significantly reduced while maintaining its stiffness and strength, and the load-carrying capacity of the blade is enhanced.

[0056] As an implementation, in addition to the above honeycomb structure aluminum alloy core material, the core material 210 can also include a foam core material. The foam core material and the aluminum alloy core material can be respectively filled in the first cavities in different carbon fiber pultrusion plates. For example, since the root of the blade is a high load area, the first cavities in the carbon fiber pultrusion plates near the blade root end 11 (see Figure 3 ) can be filled with aluminum alloy core materials, and the middle section of the blade and the tip of the blade can use a lower-cost foam material to maximize material efficiency.

[0057] Through the cooperation of the core material 210 and the carbon fiber pultrusion plate, the equivalent bending stiffness and the buckling resistance can be maintained while the beam cap 200 is lightened.

[0058] Continuing to refer to Figure 1 , the two shells 100 jointly form a receiving cavity, and the two shells 100 are provided with beam caps 200, one beam cap 200 on one of the two shells 100 is oppositely arranged with one beam cap 200 on the other shell 100. The distance between the oppositely arranged two beam caps 200 is greater than the distance between the opposite inner walls of the two shells 100.

[0059] The blade further includes at least one support 300, which is arranged in the receiving cavity and supported between the oppositely arranged two beam caps 200. The beam caps 200 and the support 300 can be integrally formed by a molding process to reduce the number of connecting parts. The support 300 can extend along the length direction of the blade, and the support 300 can include a second cavity.

[0060] By arranging the support 300 between the relatively arranged beam caps 200, the blade shell 100 can be supported, so that the shape and rigidity of the blade can be maintained, and excessive deformation of the blade under external force can be prevented. Moreover, the support 300 can effectively transmit the bending load received by the blade to the beam cap 200, thereby improving the overall load-carrying capacity of the blade. In addition, the support 300 is provided with a cavity instead of a solid design, which can further reduce the overall weight of the blade. As an embodiment, the support 300 can further include a filling layer, which can be filled in the second cavity to maintain the rigidity of the support 300. The filling layer can be a foam material such as PVC (polyvinyl chloride) foam, PET (polyethylene terephthalate) foam, or PMI (polymethyl methacrylate) foam, or can be a balsa wood. Moreover, the support 300 can be made of a carbon fiber frame to improve the strength.

[0061] As shown in Figure 1 , the connection between the two shells 100 forms the leading edge 13 and the trailing edge 14 of the blade. In order to further improve the supporting strength of the support 300, the support 300 can include a first support 310 and a second support 320. The first support 310 and the second support 320 can be arranged in the direction from the leading edge 13 to the trailing edge 14 (see Y direction in Figure 1 , the first support 310 is close to the leading edge 13, the second support 320 is close to the trailing edge 14, and the thickness of the first support 310 is greater than the thickness of the second support 320.

[0062] Since the leading edge 13 is the part of the blade first contacting the airflow, it bears a large aerodynamic force. As the main supporting structure of the leading edge 13, the first support 310 needs to have sufficient thickness to resist these loads and prevent excessive deformation or damage under high wind speed and complex wind conditions. In contrast, the trailing edge 14 bears less aerodynamic force, and the differentiation of the thickness of the first support 310 and the second support 320 not only ensures that the supporting strength of the support 300 is reasonably set according to the stress on the blade, but also effectively reduces the overall weight of the blade, reduces the material cost and the difficulty of transportation and installation.

[0063] Figure 4 Part of the structure of the support provided by the embodiments of the present application is shown in the figure. When the overall weight of the blade is reduced by reducing the thickness of the support 300 or arranging a second cavity in the support 300, in order to maintain the supporting strength and rigidity of the support 300, the support 300 can further include at least two protruding portions 330 and at least one recessed portion 340. Moreover, the at least two protruding portions 330 and the at least one recessed portion 340 are arranged alternately in the extension direction of the support 300.

[0064] Exemplarily, the protrusions 330 and / or the recesses 340 can adopt a trapezoidal shape or a sinusoidal wave shape, so that the lateral stability of the support 300 can be improved by a corrugation effect, while reducing the risk of stress concentration.

[0065] Further, the ratio of the depth of the protrusions 330 and / or the recesses 340 to the thickness of the support 300 after thinning can be 3:1, and the length can be controlled within the range of 100-300 mm to balance the bending stiffness and weight.

[0066] Figure 5 A structural schematic diagram of a wind power blade is provided for the embodiments of the present application. Figure 6 For Figure 5 A local enlarged view at A in FIG. 1. Referring to Figure 5 and Figure 6 As shown in FIG. 1, at least one lightening hole 110 can be arranged on at least one of the two shells 100, the shell 100 having a tip end 12 and a root end 11, and the at least one lightening hole 110 being arranged on the side of the shell 100 close to the tip end 12.

[0067] In this way, by opening the lightening hole 110 in the low stress area, the overall weight of the wind power blade 10 can be further reduced.

[0068] The shape of the lightening hole 110 can be circular, elliptical or regular hexagonal. By adopting a symmetrical geometric shape, the risk of stress concentration can be reduced.

[0069] As an implementation manner, the maximum hole diameter size of the lightening hole 110 can be 25%-40% of the minimum thickness size of the shell 100, for example, the maximum hole diameter size of the lightening hole 110 can be 25%, 27%, 30%, 32%, 35%, 37%, 40% or any range formed by any two of the above values of the minimum thickness size of the shell 100.

[0070] To avoid weakening the main load-bearing path by the lightening hole 110, the ratio of the distance between the lightening hole 110 and the beam cap 200 to the maximum hole diameter size of the lightening hole 110 can be greater than or equal to 10.

[0071] The edge of the lightening hole 110 can also be paved with a fiber layer, and the fiber layer can be provided with at least two layers, and the at least two layers of fiber layers are arranged in an interlaced manner. Specifically, the fiber layer can be a glass fiber layer. Thus, the stiffness compensation of the hole part can be achieved.

[0072] It should be noted that the lightening hole 110 can be designed as an internal blind hole structure, which does not penetrate the outer surface of the shell 100, thereby reducing the influence on the aerodynamic performance of the blade.

[0073] When the weight-reducing hole 110 is arranged on the pressure surface, the weight-reducing hole 110 can also penetrate the outer surface of the shell 100. The inner surface of the hole can be sprayed with a polytetrafluoroethylene (PTFE) coating to reduce airflow disturbance. When the weight-reducing hole 110 is arranged on the suction surface, the weight-reducing hole 110 towards the outer side of the shell 100 can cover the flow guide structure, maintaining the aerodynamic shape.

[0074] It can be understood that the pressure surface is the side of the blade facing the incoming flow when rotating, and the airflow speed decreases due to the obstruction of the blade, and the air pressure increases (forming a positive pressure area). The suction surface is the side of the blade away from the incoming flow when rotating, and the airflow accelerates due to the expansion of the curved surface, and the air pressure decreases (forming a negative pressure area).

[0075] As an embodiment, the shell 100 has at least two weight-reducing holes 110 arranged at intervals, and the ratio of the hole distance between the adjacent two weight-reducing holes 110 to the maximum hole diameter size of the weight-reducing hole 110 is 3:1~5:1, for example, the ratio of the hole distance between the adjacent two weight-reducing holes 110 to the maximum hole diameter size of the weight-reducing hole 110 can be 3:1, 3.5:1, 4:1, 4.5:1, 5:1 or a range formed by any two of them. Thus arranged, stress superposition effect can be avoided.

[0076] Specifically, at least two weight-reducing holes 110 can be arranged at intervals along the length direction of the blade on the shell 100. At least two weight-reducing holes 110 can be arranged at intervals along the width direction of the blade on the shell 100. At least two weight-reducing holes 110 can also be arranged at intervals along the length direction of the blade and the width direction of the blade on the shell 100.

[0077] In some embodiments, among the at least two weight-reducing holes 110 arranged at intervals along the length direction of the blade on the shell 100, the ratio of the distance between the axis of the weight-reducing hole 110 close to the blade root end 11 and the blade tip end 12 to the distance from the blade tip end 12 to the blade root end 11 is 2:1~3:1.

[0078] For example, among the at least two weight-reducing holes 110 arranged at intervals along the length direction of the blade on the shell 100, the ratio of the distance between the axis of the weight-reducing hole 110 close to the blade root end 11 and the blade tip end 12 to the distance from the blade tip end 12 to the blade root end 11 can be 2:1, 2.5:1, 3:1 or a range formed by any two of them. Thus arranged, the weight-reducing hole 110 can be controlled within the low stress area, reducing the impact on the overall strength of the blade.

[0079] Figure 7 The structural schematic diagram of the wind wheel provided by the embodiments of the present application is provided. Referring to Figure 7As shown, the second aspect of the present application provides a wind wheel, which comprises a main shaft 30, a hub 20 and a wind power blade 10 as in the above embodiment. Wherein, the wind power blade 10 is connected with the hub 20 and can drive the hub 20 to rotate, and the main shaft 30 is connected with the hub 20 and can rotate under the driving of the hub 20.

[0080] Figure 8 The connection relationship diagram of the wind turbine provided by the embodiment of the present application is shown in the figure. Figure 8 As shown, the third aspect of the present application also provides a wind turbine, which comprises the wind wheel, a generator 40 and a tower 50 as above.

[0081] Wherein, the wind wheel can capture wind energy to rotate and drive the generator 40 to generate electricity, and the tower 50 can provide support for the wind wheel and the generator 40.

[0082] It should be noted that the "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like mentioned in the specification represent that the described embodiment can include a specific feature, structure or characteristic, but not necessarily every embodiment includes the specific feature, structure or characteristic. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in connection with other embodiments described explicitly or implicitly.

[0083] Generally speaking, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic of singular meaning, or can be used to describe the combination of features, structures or characteristics of plural meaning. Similarly, at least partly according to the context, terms such as "a" or "said" can be understood as conveying singular usage or conveying plural usage.

[0084] It should be easily understood that "on", "above" and "over" in the present application should be interpreted in the broadest way, so that "on" not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but also can include the meaning of "above" or "over something" without intermediate features or layers therebetween (i.e. directly on something).

[0085] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0086] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application; even though 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 recorded in the foregoing embodiments, or equivalently replace some or all of the technical features thereof; and such 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 wind turbine blade, characterized in that, include: Two housings are arranged opposite each other and connected end to end, and at least one of the two housings has at least one notch; A beam cap is disposed at the notch and connected to the corresponding shell, with one notch corresponding to one beam cap; the beam cap includes at least two carbon fiber pultruded plates stacked along the thickness direction of the shell, and the contour shape formed by the at least two carbon fiber pultruded plates matches the extended contour of the corresponding shell; each carbon fiber pultruded plate has a first cavity; A core material is filled into the first cavity, and the density of the core material is less than 2.5 g / cm³.

2. The wind turbine blade according to claim 1, characterized in that, The core material is an aluminum alloy core material, and the core material has multiple spaced gaps. The ratio of the total volume of the multiple gaps in the core material to the total volume of the core material is 80% to 95%.

3. The wind turbine blade according to any one of claims 1 or 2, characterized in that, The two shells together enclose a receiving cavity, and each of the two shells is provided with a beam cap. One beam cap on one of the two shells is arranged opposite to one beam cap on the other shell. The distance between the two beam caps arranged opposite to each other is greater than the distance between the relative inner walls of the two shells. The blade further includes at least one support member disposed in the accommodating cavity and supported between two opposing beam caps, wherein the support member has a second cavity.

4. The wind turbine blade according to claim 3, characterized in that, The support also includes a filling layer that fills the second cavity, and the filling layer is either a foam material or balsa wood.

5. The wind turbine blade according to claim 3, characterized in that, The connection between the two housings forms a leading edge and a trailing edge; the support includes a first support and a second support, which are spaced apart along the direction from the leading edge to the trailing edge. The first support member is located near the leading edge, the second support member is located near the trailing edge, and the thickness of the first support member is greater than the thickness of the second support member.

6. The wind turbine blade according to claim 3, characterized in that, The support member includes at least two protrusions and at least one recess, and the at least two protrusions and at least one recess are alternately arranged along the extension direction of the support member.

7. The wind turbine blade according to any one of claims 1 or 2, characterized in that, At least one of the two housings is provided with at least one weight-reducing hole, the housing has a blade tip and a blade root, and at least one of the weight-reducing holes is provided on the side of the housing near the blade tip.

8. The wind turbine blade according to claim 7, characterized in that, The maximum diameter of the weight-reducing hole is 25% to 40% of the minimum thickness of the shell; and / or, The housing has at least two weight-reducing holes spaced apart, and the ratio of the hole spacing between two adjacent weight-reducing holes to the maximum diameter of the weight-reducing hole is 3:1 to 5:1; and / or, In the at least two weight-reducing holes spaced apart along the blade length on the housing, the ratio of the distance between the axis of the weight-reducing hole closest to the blade root and the blade tip to the distance from the blade tip to the blade root is 2:1 to 3:

1.

9. The wind turbine blade according to claim 7, characterized in that, The ratio of the distance between the weight-reducing hole and the beam cap to the maximum diameter of the weight-reducing hole is greater than or equal to 10; and / or, The edge of the weight-reducing hole is further covered with a fiber layer, wherein at least two fiber layers are provided, and the at least two fiber layers are staggered and overlapped; and / or, The shape of the weight-reducing hole can be circular, elliptical, or regular hexagonal.

10. A wind turbine, characterized in that, include: Main shaft, hub, and wind turbine blade as described in any one of claims 1-9; The wind turbine blades are connected to the hub; the main shaft is connected to the hub and can rotate under the drive of the hub.

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