Wind turbine blade

Abstract

This application relates to the field of wind power generation and discloses a wind turbine blade. Specifically, a wind turbine blade includes: a blade body including a hollow cavity; a counterweight assembly installed in the hollow cavity of the blade body; the counterweight assembly is connected to the blade body through a first elastic adhesive layer, and the first elastic adhesive layer includes an adhesive with a tensile modulus less than 2 GPa. This is used to solve the problem that stress concentration will occur between the counterweight and the wind turbine blade, resulting in damage and even detachment. By connecting the counterweight assembly and the blade body through the first elastic adhesive layer, and the first elastic adhesive layer includes an adhesive with a tensile modulus less than 2 GPa, when the wind turbine blade is stressed, the deformation of the counterweight assembly and the deformation of the blade body are isolated by the first elastic adhesive layer. The first elastic adhesive layer has a certain elastic deformation, avoiding stress concentration and stress accumulation between the counterweight assembly and the blade body, reducing the damage between the counterweight assembly and the blade body, and reducing the risk of detachment of the counterweight assembly.

Description

Technical Field

[0001] This application belongs to the field of wind power generation, and particularly relates to a wind turbine blade. Background Art

[0002] A wind turbine blade is a rotating component of a wind turbine, consisting of a blade and a hub, and is one of the key components of a wind turbine. Based on the principle of aerodynamics, the shape of the blade is very similar to that of an airplane wing, characterized by being long and thin. When the wind blows over the blade, different air flow velocities and air pressure distributions are generated on the curved surface of the blade, thereby generating a forward aerodynamic force on the blade, causing the blade to start rotating. The rotation of the blade drives the rotation of the rotor of the wind turbine, thereby generating electrical energy.

[0003] Among them, when the rotational speed of the wind turbine blade reaches a certain value, due to the influence of its own structure and turbulent wind energy, vibration will occur, and severe vibration will damage the wind turbine generator set. In order to prevent excessive vibration of the blade from damaging the wind turbine generator set, a counterweight is installed on the wind turbine blade to control and reduce the vibration value. The counterweight generally uses heavy objects such as lead blocks and iron blocks, which are installed at the center of gravity position of the blade or near the center of gravity position to reduce the mutual difference between the weights and mass moments of the three blades, and improve the dynamic balance during operation and the stability of the wind turbine operation.

[0004] However, the existing counterweights are mostly bonded to the wind turbine blade with a mold release adhesive. When the wind turbine blade is deformed under load, stress concentration will occur between the counterweight and the wind turbine blade, and then damage will occur, and even the counterweight will fall off. Summary of the Invention

[0005] The embodiments of this application provide a wind turbine blade, which can reduce the stress concentration between the counterweight assembly and the blade body and improve the connection stability of the counterweight assembly.

[0006] The embodiments of this application provide a wind turbine blade, including: a blade body, the blade body includes a windward surface shell, a leeward surface shell, and a hollow cavity formed by the windward surface shell and the leeward surface shell; a counterweight assembly, the counterweight assembly is installed in the hollow cavity of the blade body; a first elastic adhesive layer, the counterweight assembly is connected to the blade body through the first elastic adhesive layer, and the first elastic adhesive layer includes an adhesive with a tensile modulus less than 2 GPa; wherein, the deformation of the counterweight assembly and the deformation of the blade body are isolated by the first elastic adhesive layer, so that the counterweight assembly and the blade body deform independently.

[0007] According to the wind turbine blade provided by the embodiments of this application, the counterweight assembly includes at least two counterweight blocks and a second elastic adhesive layer filled between adjacent counterweight blocks, and the second elastic adhesive layer includes an adhesive with a tensile modulus less than 2 GPa.

[0008] According to the wind turbine blade provided by the embodiment of the present application, the first elastic adhesive layer includes an adhesive with a tensile modulus in the range of 0.01 GPa to 1 GPa.

[0009] According to the wind turbine blade provided by the embodiment of the present application, the thickness of the first elastic adhesive layer is greater than the thickness of the second elastic adhesive layer.

[0010] According to the wind turbine blade provided by the embodiment of the present application, the thickness range of the first elastic adhesive layer is 3 mm to 20 mm.

[0011] According to the wind turbine blade provided by the embodiment of the present application, the thickness range of the second elastic adhesive layer is 2 mm to 5 mm.

[0012] According to the wind turbine blade provided by the embodiment of the present application, it further includes a fiber protection layer, the fiber protection layer covers the outer surface of the counterweight assembly, and the edge of the fiber protection layer is connected to the blade body.

[0013] According to the wind turbine blade provided by the embodiment of the present application, the fiber protection layer includes a biaxial fiberglass fabric, and the included angle range between the fiber direction of the biaxial fiberglass fabric and the force direction is ±45 degrees.

[0014] According to the wind turbine blade provided by the embodiment of the present application, the blade body includes a rib plate disposed in the hollow cavity, the rib plate is connected between the windward surface shell and the leeward surface shell, and the counterweight assembly is at least installed on the rib plate far from the leading edge of the blade body.

[0015] According to the wind turbine blade provided by the embodiment of the present application, the counterweight assembly is at least installed on one side of the rib plate facing away from the leading edge of the blade body.

[0016] According to the wind turbine blade provided by the embodiment of the present application, the counterweight assembly includes a first counterweight layer, a second counterweight layer and a third elastic adhesive layer stacked along the chord length direction of the wind turbine blade. The first counterweight layer is bonded to the rib plate through the first elastic adhesive layer, and the second counterweight layer is bonded to the side of the first counterweight layer facing away from the rib plate through the third elastic adhesive layer; both the first counterweight layer and the second counterweight layer include at least two of the counterweight blocks and the second elastic adhesive layer, and a plurality of the counterweight blocks are arranged in a plane perpendicular to the chord length direction.

[0017] In the wind turbine blade according to the embodiment of the present application, a counterweight assembly is installed in the hollow cavity of the blade body, and the counterweight assembly is connected to the blade body through a first elastic adhesive layer. The first elastic adhesive layer includes an adhesive with a tensile modulus less than 2 GPa, that is, an elastic adhesive layer with a low elastic modulus. When the wind turbine blade is stressed, the deformation of the counterweight assembly and the deformation of the blade body are isolated by the first elastic adhesive layer. The first elastic adhesive layer has a certain elastic deformation. Therefore, the blade body and the counterweight assembly deform independently, avoiding stress concentration and stress accumulation between the counterweight assembly and the blade body, reducing damage between the counterweight assembly and the blade body, and reducing the risk of the counterweight assembly falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1 FIG. shows a cross-sectional view of a wind turbine blade provided by some embodiments of the present application;

[0020] Figure 2 FIG. shows a perspective view of a counterweight assembly provided by some embodiments of the present application;

[0021] Figure 3 FIG. shows a top view of a counterweight assembly with a fiber protection layer provided by some embodiments of the present application;

[0022] Figure 4 FIG. shows a partial schematic view of a counterweight assembly installed on a rib provided by some embodiments of the present application;

[0023] Figure 5 FIG. shows a partial schematic view of a counterweight assembly installed on a rib provided by some other embodiments of the present application.

[0024] REFERENCE NUMERALS:

[0025] 100: blade body; 101: windward side housing; 102: leeward side housing; 103: rib; 200: counterweight assembly; 201: first counterweight layer; 202: second counterweight layer; 203: third elastic adhesive layer; 211: counterweight block; 212: second elastic adhesive layer; 220: first elastic adhesive layer; 230: fiber protection layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0027] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0028] Wind power generation converts the kinetic energy of the wind into mechanical kinetic energy and then converts the mechanical energy into electrical kinetic energy. As a clean energy source, wind power generation can effectively reduce carbon dioxide emissions, improve energy utilization efficiency, and promote low-carbon development. Wind turbine blades are one of the key core components for a generator set to convert wind energy into mechanical energy. A generator set generally consists of 3 wind turbine blades. When the rotational speed of the wind turbine blades reaches a certain value, due to the influence of its own structure and turbulent wind energy, vibration will occur, and severe vibration will damage the wind turbine generator set. To prevent excessive blade vibration from damaging the wind turbine generator set, a counterweight is installed on the wind turbine blade to control and reduce the vibration value. The counterweight is realized by a counterweight block. Usually, a counterweight block is added at the center of gravity of the blade to reduce the mutual difference in weight and mass moment of the three blades, improve the dynamic balance during operation, and improve the operation stability of the wind turbine.

[0029] In the prior art, a whole counterweight block is bonded to the wind turbine blade with a mold closing adhesive having a high tensile modulus (2 GPa - 3 GPa). When the wind turbine blade is deformed under load, stress concentration will occur between the counterweight and the wind turbine blade, and then damage will appear, and even the counterweight will fall off.

[0030] To solve the problems of the prior art, an embodiment of the present application provides a wind turbine blade. The wind turbine blade provided by the embodiment of the present application will be introduced below.

[0031] Figure 1 The cross-sectional schematic diagram of a wind turbine blade provided by some embodiments of the present application is shown.

[0032] As Figure 1 shown, embodiments of the present application provide a wind turbine blade, including: a blade body 100, a counterweight assembly 200, and a first elastic adhesive layer 220. The blade body 100 includes a windward shell 101, a leeward shell 102, and a hollow cavity formed by the windward shell 101 and the leeward shell 102; the counterweight assembly 200 is installed in the hollow cavity of the blade body 100; the counterweight assembly 200 is connected to the blade body 100 through the first elastic adhesive layer 220, and the first elastic adhesive layer 220 includes an adhesive with a tensile modulus less than 2 GPa; wherein, the deformation of the counterweight assembly 200 and the deformation of the blade body 100 are isolated by the first elastic adhesive layer 220, so that the counterweight assembly 200 and the blade body 100 deform independently.

[0033] The windward shell 101 is the outer shell on the side of the blade facing the airflow (or wind). In a wind turbine, the windward shell 101 side is directly impacted by the wind, so it must be designed to be strong enough to withstand the pressure and power generated by the wind. The leeward shell 102 is opposite to the windward shell 101, and the leeward shell 102 is located on the back of the blade, that is, on the side away from the airflow. The space formed by the windward shell 101 and the leeward shell 102 is called a hollow cavity. The hollow cavity can significantly reduce the total weight of the blade, thereby improving its efficiency and performance. The hollow cavity can include reinforcing ribs or other structural elements to enhance the rigidity and stability of the blade. The hollow cavity can also be used for thermal management (such as heat dissipation) or sound insulation (such as reducing noise transmission).

[0034] Installing the counterweight assembly 200 in the hollow cavity can play a role in protecting the counterweight assembly 200, reducing the impact of the harsh environment on the service life and balance accuracy of the counterweight assembly 200 when it is exposed to the outside. And placing the counterweight assembly 200 in the hollow cavity is convenient for installation. Even if the counterweight assembly 200 falls off, it can be received by the windward shell 101 and the leeward shell 102, avoiding falling from a height and reducing the use risk of the wind turbine blade.

[0035] The counterweight assembly 200 is connected to the blade body 100 through the first elastic adhesive layer 220, thus avoiding damage to the structure caused by fixed connection methods such as drilling holes in the blade body 100 and ensuring the structural integrity of the blade body 100. In addition, the first elastic adhesive layer 220 has the advantages of high connection strength, light weight, good corrosion resistance, etc. The bonding method also has a certain buffering and shock absorption effect, which helps to protect the blade body 100 and the counterweight assembly 200.

[0036] The first elastic adhesive layer 220 comprises an adhesive with a tensile modulus less than 2 GPa, that is, the first elastic adhesive layer 220 comprises an adhesive with a low tensile modulus. The tensile modulus is the ratio of the normal stress to the corresponding normal strain within the elastic deformation range of a material, which reflects the ability of the material to resist tensile deformation. The adhesive with a tensile modulus less than 2 GPa has high flexibility and elasticity, and can better adapt to the small deformations and displacements between the blade body 100 and the counterweight assembly 200. When the wind turbine blade is stressed, the deformation of the counterweight assembly 200 and the deformation of the blade body 100 are isolated by the first elastic adhesive layer 220, so that the counterweight assembly 200 and the blade body 100 deform independently, avoiding stress concentration and stress accumulation, and no stress concentration occurs around the counterweight assembly 200, thereby improving the connection stability and impact resistance between the counterweight assembly 200 and the blade body 100.

[0037] Among them, the adhesive can include materials such as epoxy, polyurethane, and acrylic. Taking polyurethane adhesive as an example, it can include components A and B, and the two components are mixed evenly during use; it can also be multi-component or even single-component.

[0038] For the case of components A and B, component A is the main agent, and component B is isocyanate, also known as the curing agent component; the curing agent (component B) used is polyphenyl polyisocyanate, MDI, IPDI or a mixture thereof; the curing agent can also partially use dimers and trimers of MDI, prepolymers with polyols, trimers of TDI, and prepolymers with polyols, trimers of HDI, and mixed trimers of HDI and TDI, and prepolymers of HDI with polyols.

[0039] For the single-component case: The component A used is mainly composed of polyhydroxy compounds. The polyhydroxy compounds can be hydroxyl-terminated polyethers, hydroxyl-terminated polyesters, and all compounds containing multiple hydroxyl groups; the average molecular weight is in the range of 200 to 5000, and the viscosity at 25 °C is lower than 20000 mPa·sec; the average functionality is 2 to 10.

[0040] In addition, in the embodiment of the present application, the first elastic adhesive layer 220 comprises an adhesive with a tensile modulus in the range of 0.01 GPa to 1 GPa. At room temperature (about 23 °C), the tensile modulus of the adhesive is 0.01 GPa - 1 GPa; when the modulus is 0.001 GPa - 0.1 GPa, the first elastic adhesive layer 220 has a better effect of reducing stress concentration. When the modulus of the first elastic adhesive layer 220 is 0.001 GPa - 0.1 GPa, its effect of reducing stress concentration is better. The tensile modulus of the adhesive is 0.01 GPa - 1 GPa, and the adhesive layer has high elasticity and flexibility, and can allow a larger amount of deformation.

[0041] Continue to refer to Figure 1In an optional embodiment of the present application, the blade body 100 includes a rib plate 103 disposed in a hollow cavity, the rib plate 103 is connected between the windward shell 101 and the leeward shell 102, and the counterweight assembly 200 is at least installed on the rib plate 103 away from the leading edge of the blade body 100.

[0042] The rib plate 103 is connected between the windward shell 101 and the leeward shell 102. The rib plate 103 can provide additional support for the wind turbine blades, effectively resisting various bending, torsion and tensile stresses borne by the wind turbine blades under the action of wind force. The wind turbine blades are not easily deformed in harsh environments such as strong winds, and maintain a stable shape and structure, ensuring that the wind turbine blades can operate normally and efficiently convert wind energy into mechanical energy. In addition, the anti-bending ability of the wind turbine blades is enhanced to prevent the wind turbine blades from excessively bending due to their own gravity and wind force, thereby extending the service life of the blades.

[0043] At least two ribs 103 are distributed along the radial direction of the wind turbine blade in the hollow cavity, and the counterweight assembly 200 is installed at least on the rib 103 away from the leading edge of the blade body 100. The rib 103 is in an "I" shape, and has a straight section, which is convenient for the installation of the counterweight assembly 200, and the structure of the counterweight assembly 200 can be more regular, for example, it can be a rectangular block, which is convenient for the production of the counterweight assembly 200 and the precise control of the weight.

[0044] In another optional embodiment of the present application, the counterweight assembly 200 is installed at least on the side of the rib plate 103 facing away from the leading edge of the blade body 100. In other words, the counterweight assembly 200 is close to the trailing edge side.

[0045] The weight assembly 200 near the trailing edge can adjust the lift distribution of the wind turbine blade. During the rotation of the wind turbine blade, different parts generate different lifts. The weight assembly 200 near the trailing edge can fine-tune the aerodynamic shape of the wind turbine blade to make the lift distribution more uniform and improve the wind energy conversion efficiency. Reasonable lift distribution helps to reduce airflow separation on the surface of the wind turbine blade, reduce aerodynamic resistance, and thus improve the performance of the entire wind turbine generator set.

[0046] Wind force will cause torsion and bending deformation on the wind turbine blade. Placing the counterweight assembly 200 close to the trailing edge can balance the torsional moment of the wind turbine blade at different wind speeds to a certain extent, reducing the degree of distortion of the blade. The counterweight assembly 200 near the trailing edge can also inhibit the bending deformation of the wind turbine blade to a certain extent, so that the wind turbine blade maintains a relatively stable shape during operation, reducing structural damage and performance degradation caused by excessive deformation.

[0047] Wind turbine blades are usually long and slender, and the position of the center of gravity has an important impact on their stability and dynamic response. Placing the counterweight assembly 200 near the trailing edge can lower the overall center of gravity of the blade and improve its stability. A lower center of gravity makes the wind turbine blade more stable during rotation and under the action of wind, reducing wobbling and vibration and lowering the risk of structural fatigue.

[0048] Figure 2 The perspective view of the counterweight assembly 200 provided by some embodiments of the present application is shown; Figure 3 The top view of the counterweight assembly 200 with a fiber protection layer 230 provided by some embodiments of the present application is shown; Figure 4 The partial schematic diagram of the counterweight assembly 200 installed on the rib plate 103 provided by some embodiments of the present application is shown.

[0049] As Figures 2 to 4 shown, in other embodiments of the present application, the wind turbine blade further includes a fiber protection layer 230. The fiber protection layer 230 is wrapped around the outer surface of the counterweight assembly 200, and the edge of the fiber protection layer 230 is connected to the blade body 100.

[0050] The fiber protection layer 230 can firmly wrap the counterweight assembly 200 on the blade body 100, preventing the counterweight assembly 200 from shifting during blade rotation and vibration. It limits the counterweight assembly 200, keeps the position of the counterweight assembly 200 stable, and maintains the balance and stability of the wind turbine blade. A stable counterweight assembly 200 helps improve the aerodynamic performance and structural strength of the wind turbine blade, reducing vibration and noise caused by the movement of the counterweight assembly 200.

[0051] When the wind turbine blade is subjected to wind force or other external forces, the generated stress is transmitted to the counterweight assembly 200 through the fiber protection layer 230. The fiber protection layer 230 can evenly disperse these stresses, avoiding stress concentration in local areas of the counterweight assembly 200, thereby reducing the risk of damage to the counterweight assembly 200. At the same time, the fiber protection layer 230 itself also has a certain tensile strength and toughness, can withstand part of the stress, share the external force with the blade body 100, and improve the reliability of the entire wind turbine blade structure.

[0052] Among them, the material of the fiber protection layer 230 includes biaxial fiberglass fabric or organic fiber fabric, and the organic fiber fabric can include nylon fiber fabric, acrylic fiber fabric or polyester fiber fabric. The fiber protection layer 230 can reduce the modulus of the counterweight assembly 200.

[0053] Further, in an optional embodiment of the present application, the fiber protection layer includes a biaxial fiberglass fabric, and the included angle range between the fiber direction of the biaxial fiberglass fabric and the stress direction is ±45 degrees. It can reduce the modulus of the counterweight assembly 200 in the 90° direction.

[0054] The included angle range between the fiber direction and the stress direction is ±45 degrees, such that the fibers of the fiber protection layer 230 will simultaneously bear component forces from different directions, causing the stress to no longer concentrate in a single direction and be dispersed among the fibers of the fiber protection layer 230. For the counterweight assembly 200, stress dispersion can reduce the concentrated stress borne by it in the 90° direction, thereby improving the stability and reliability of the overall structure.

[0055] For example, the fiber protection layer 230 includes a biaxial fiberglass fabric with a fiber direction of ±45°, such that the included angle range between the fiber direction and the stress direction is ±45 degrees. When subjected to an external force, the fiber protection layer 230 has a certain buffer space in the direction perpendicular to the fiber protection layer 230. This can reduce stress concentration and possible damage caused by excessive rigidity.

[0056] Continue to refer to Figure 2 and Figure 4 As shown, in other embodiments of the present application, the counterweight assembly 200 includes at least two counterweight blocks 211 and a second elastic adhesive layer 212 filled between adjacent counterweight blocks 211. The second elastic adhesive layer 212 includes an adhesive with a tensile modulus less than 2 GPa.

[0057] That is to say, the counterweight assembly 200 includes multiple counterweight blocks 211. When subjected to an external force, each counterweight block 211 deforms independently, avoiding stress concentration and stress accumulation. For example, when the wind turbine blade is subjected to wind impact or vibration, the counterweight blocks 211 at different positions will deform separately according to the direction and magnitude of the external force received. The characteristic of independent deformation prevents the stress from concentrating at a specific point, thereby reducing the risk of structural damage caused by excessive local stress.

[0058] The second elastic adhesive layer 212 with a low modulus connects the multiple counterweight blocks 211. When the multiple counterweight blocks 211 are subjected to an external force, the second elastic adhesive allows the multiple counterweight blocks 211 to respond to the external force independently, without transmitting the stress to adjacent counterweight blocks 211, and maintains the overall connectivity. This avoids stress accumulation in the entire counterweight assembly 200, keeping the stress borne by each counterweight block 211 at a relatively low level. Among them, the adhesive of the second elastic adhesive layer 212 can include materials such as epoxy, polyurethane, and acrylic. Taking polyurethane adhesive as an example, it can include components A and B, and the two components are mixed evenly during use; it can also be multi-component or even single-component.

[0059] Figure 5 Shows a partial schematic diagram of the counterweight assembly 200 provided in some other embodiments of the present application installed on the rib plate 103.

[0060] As Figure 5As shown, in some other embodiments of the present application, the counterweight assembly 200 includes a first counterweight layer 201, a second counterweight layer 202, and a third elastic adhesive layer 203 stacked along the chord length direction of the wind turbine blade. The first counterweight layer 201 is bonded to the rib 103 through a first elastic adhesive layer 220, and the second counterweight layer 202 is bonded to the side of the first counterweight layer 201 facing away from the rib 103 through the third elastic adhesive layer 203. Both the first counterweight layer 201 and the second counterweight layer 202 include at least two counterweight blocks 211 and a second elastic adhesive layer 212, and the plurality of counterweight blocks 211 are arranged in a plane perpendicular to the chord length direction.

[0061] Among them, the third elastic adhesive layer 203 includes an adhesive with a tensile modulus less than 2 GPa. The adhesive of the third elastic adhesive layer 203 may include materials such as epoxy, polyurethane, and acrylic. Taking polyurethane adhesive as an example, it may include components A and B, and the two components are mixed evenly during use; it may also be multi-component or even single-component. The counterweight block 211 may be made of metal or rubber with a relatively high density.

[0062] In order to increase the weight of the counterweight assembly 200, multiple counterweight layers can be provided. The second counterweight layer 202 is bonded to the side of the first counterweight layer 201 facing away from the rib 103 through the third elastic adhesive layer 203. The second counterweight layer 202 may include multiple counterweight layers stacked along the chord length direction, and the multiple counterweight layers are connected through the third elastic adhesive layer 203. Each counterweight layer includes a plurality of counterweight blocks 211, and the plurality of counterweight blocks 211 are connected through the second elastic adhesive layer 212. The number of counterweight blocks 211 in each counterweight layer may be the same or different. The mass and size of the counterweight blocks 211 in each layer may be the same or different.

[0063] In addition, in the embodiments of the present application, the thickness of the first elastic adhesive layer 220 is greater than the thickness of the second elastic adhesive layer 212.

[0064] A greater thickness of the first elastic adhesive layer 220 can better and firmly connect with the blade body 100, and the first elastic adhesive layer 220 receives the stress transmitted from the blade body 100 first and is subjected to the greatest stress. A thicker first elastic adhesive layer 220 can withstand a greater load without falling off. The second elastic adhesive layer 212 is used to connect the counterweight blocks 211, and the counterweight blocks 211 have a relatively small mass. Therefore, a relatively thinner adhesive can be used to achieve a stable connection to ensure a large mass of the counterweight assembly 200 in a small volume.

[0065] Furthermore, in the embodiments of the present application, the thickness range of the first elastic adhesive layer 220 is 3 millimeters to 20 millimeters.

[0066] In another embodiment of the present application, the thickness range of the second elastic adhesive layer 212 is 2 millimeters to 5 millimeters.

[0067] As described above, this is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application.

Claims

1. A wind turbine blade, characterized in that: include: A blade body, the blade body comprising a windward surface shell, a leeward surface shell and a hollow cavity formed by the windward surface shell and the leeward surface shell; A counterweight assembly, the counterweight assembly being installed in the hollow cavity of the blade body, the counterweight assembly comprising a first counterweight layer, a second counterweight layer, a third elastic adhesive layer and a rib plate stacked along the chord length direction of the wind turbine blade; a first elastic adhesive layer, the counterweight assembly is connected to the blade body through the first elastic adhesive layer, and the first elastic adhesive layer includes an adhesive having a tensile modulus less than 2 GPa; The first counterweight layer is bonded to the rib plate through the first elastic adhesive layer, and the second counterweight layer is bonded to the side of the first counterweight layer away from the rib plate through the third elastic adhesive layer; the first counterweight layer and the second counterweight layer each include at least two counterweight blocks and a second elastic adhesive layer filled between adjacent counterweight blocks, and the plurality of counterweight blocks are arranged along a plane perpendicular to the chord length direction; The deformation of the counterweight assembly and the deformation of the blade body are isolated by the first elastic adhesive layer, so that the counterweight assembly and the blade body can be deformed independently.

2. The wind turbine blade according to claim 1, characterized in that: The second elastic adhesive layer includes an adhesive having a tensile modulus less than 2 GPa.

3. The wind turbine blade according to claim 1, characterized in that: The first elastic adhesive layer includes an adhesive having a tensile modulus in the range of 0.01 GPa to 1 GPa.

4. The wind turbine blade according to claim 2, characterized in that: The thickness of the first elastic adhesive layer is greater than the thickness of the second elastic adhesive layer.

5. The wind turbine blade according to claim 4, characterized in that: The thickness of the first elastic adhesive layer ranges from 3 mm to 20 mm.

6. The wind turbine blade according to claim 4, characterized in that: The thickness of the second elastic adhesive layer ranges from 2 mm to 5 mm.

7. The wind turbine blade according to any one of claims 1 to 6, characterized in that: It also includes a fiber protection layer, which is coated on the outer surface of the counterweight component, and the edge of the fiber protection layer is connected to the blade body.

8. The wind turbine blade according to claim 7, characterized in that: The fiber protection layer comprises a biaxial glass fiber fabric, and the angle between the fiber direction of the biaxial glass fiber fabric and the force direction is in the range of ±45 degrees.

9. The wind turbine blade according to claim 2, characterized in that: The rib plate is connected between the windward surface shell and the leeward surface shell, and the counterweight assembly is at least installed on the rib plate away from the leading edge of the blade body.

10. The wind turbine blade according to claim 9, characterized in that: The counterweight assembly is at least mounted on a side of the rib plate facing away from the leading edge of the blade body.

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