Wind power blade

Abstract

The invention relates to the field of wind power generation, and discloses a wind power blade which comprises a blade body, a wind power generation assembly and a wind power generation assembly. The counterweight assembly is mounted in the hollow cavity of the blade body; the balance weight assembly is connected to the blade body through a first elastic bonding layer, and the first elastic bonding layer comprises bonding glue with the tensile modulus smaller than 2 GPa. The problems that stress concentration can be generated between a balance weight and a wind power blade, and then damage and even falling are caused are solved. The balance weight assembly is connected with the blade body through the first elastic bonding layer, the first elastic bonding layer comprises the bonding glue with the tensile modulus smaller than 2 GPa, when the wind power blade is stressed, deformation of the balance weight assembly and deformation of the blade body are isolated through the first elastic bonding layer, and the first elastic bonding layer has certain elastic deformation; stress concentration and stress accumulation between the balance weight assembly and the blade body are avoided, damage between the balance weight assembly and the blade body is reduced, and the risk that the balance weight assembly falls off is reduced.

Description

Technical Field

[0001] The present application belongs to the field of wind power generation, and in particular relates to a wind power blade. Background Art

[0002] Wind turbine blades are the rotating parts of wind turbines. They are composed of paddle-shaped blades and a hub, and are one of the key components of wind turbines. Based on the principles of aerodynamics, the shape of the blades is very similar to the wings of an airplane, and they are long and thin. When wind blows over the blades, the curved surface on the blades will produce different airflow speeds and air pressure distributions, thereby generating a forward aerodynamic force on the blades, causing the blades to start rotating. The rotation of the blades drives the rotation of the wind turbine rotor, thereby generating electrical energy.

[0003] When the speed of wind turbine blades reaches a certain value, they will vibrate due to their own structure and the impact of turbulent wind energy, and severe vibration will damage the wind turbine. In order to prevent the excessive vibration of the blades from damaging the wind turbine, counterweights are installed on the wind turbine blades to control and reduce the vibration value. The counterweights are generally heavy objects such as lead blocks and iron blocks, installed at the center of gravity of the blades or near the center of gravity to reduce the mutual difference between the weight and mass moment of the three blades, and improve the dynamic balance of the operation process and the stability of the wind turbine operation.

[0004] However, existing counterweights are mostly bonded to wind turbine blades using mold adhesive. When the wind turbine blades are deformed under load, stress concentration will occur between the counterweight and the wind turbine blades, resulting in damage and even causing the counterweight to fall off. Summary of the invention

[0005] The embodiment of the present application provides 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] An embodiment of the present application provides a wind turbine blade, comprising: 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; a first elastic adhesive layer, the counterweight assembly being connected to the blade body through the first elastic adhesive layer, the first elastic adhesive layer comprising an adhesive with a tensile modulus less than 2 GPa; wherein the deformation of the counterweight assembly is isolated from the deformation of the blade body by the first elastic adhesive layer, so that the counterweight assembly and the blade body can deform independently.

[0007] According to the wind turbine blade provided in the embodiment of the present 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 having a tensile modulus less than 2 GPa.

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

[0009] According to the wind turbine blade provided in 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 in the embodiment of the present application, the thickness of the first elastic adhesive layer ranges from 3 mm to 20 mm.

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

[0012] The wind turbine blade provided according to the embodiment of the present application further includes a fiber protective layer, which is coated on the outer surface of the counterweight assembly, and the edge of the fiber protective layer is connected to the blade body.

[0013] According to the wind turbine blade provided in the embodiment of the present application, the fiber protective layer includes 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.

[0014] According to the wind turbine blade provided in the embodiment of the present application, the blade body includes a rib plate placed 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 away from the leading edge of the blade body.

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

[0016] According to the wind turbine blade provided in 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 a 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 the second elastic adhesive layer, and the plurality of counterweight blocks are arranged along a plane perpendicular to the chord length direction.

[0017] The wind turbine blade of the embodiment of the present application is achieved by installing a counterweight assembly in the hollow cavity of the blade body, and the counterweight assembly and the blade body are connected by 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 subjected to force, 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, so 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 solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic cross-sectional view of a wind turbine blade provided by some embodiments of the present application is shown;

[0020] Figure 2 A perspective view of a counterweight assembly provided in some embodiments of the present application is shown;

[0021] Figure 3 A top view of a weight assembly with a fiber protective layer provided in some embodiments of the present application is shown;

[0022] Figure 4 A partial schematic diagram showing the installation of a counterweight assembly to a rib plate provided in some embodiments of the present application is shown;

[0023] Figure 5 A partial schematic diagram of the installation of a counterweight assembly to a rib plate provided in some other embodiments of the present application is shown.

[0024] Reference numerals:

[0025] 100: blade body; 101: windward shell; 102: leeward shell; 103: rib plate; 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 protective layer. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0028] Wind power generation is the process of converting wind kinetic energy into mechanical kinetic energy, and then converting 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 of a generator set that converts wind energy into mechanical energy. A generator set is generally composed of three wind turbine blades. When the speed of a wind turbine blade reaches a certain value, it will vibrate due to its own structure and the influence of bumpy wind energy, and severe vibration will cause damage to the wind turbine. In order to prevent excessive blade vibration from damaging the wind turbine, counterweights are installed on the wind turbine blades to control and reduce the vibration value. Counterweights are achieved through counterweights. Counterweights are usually added at the center of gravity of the blades to reduce the weight and mass moment difference of the three blades, improve the dynamic balance of the operation process, and improve the stability of wind turbine operation.

[0029] The existing technology is to glue an integral counterweight block to the wind turbine blade using a mold adhesive with a high tensile modulus (2GPa-3GPa). When the wind turbine blade is deformed under load, stress concentration will occur between the counterweight and the wind turbine blade, resulting in damage or even causing the counterweight to fall off.

[0030] In order to solve the problems in 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 is introduced below.

[0031] Figure 1 A schematic cross-sectional view of a wind turbine blade provided in some embodiments of the present application is shown.

[0032] like Figure 1 As shown, an embodiment of the present application provides a wind turbine blade, comprising: a blade body 100, a counterweight assembly 200 and a first elastic adhesive layer 220, the blade body 100 comprising a windward surface shell 101, a leeward surface shell 102 and a hollow cavity formed by the windward surface shell 101 and the leeward surface 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 comprises an adhesive having a tensile modulus less than 2 GPa; wherein the deformation of the counterweight assembly 200 is isolated from the deformation of the blade body 100 by the first elastic adhesive layer 220, so that the counterweight assembly 200 and the blade body 100 are deformed independently.

[0033] The windward shell 101 is the outer shell of 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, 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 protect the counterweight assembly 200, reduce the counterweight assembly 200 from being exposed to the outside and being affected by the harsh environment, which affects its service life and balance accuracy. In addition, the counterweight assembly 200 is placed in the hollow cavity for easy 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 high altitude and increasing the risk of using the wind turbine blade.

[0035] The counterweight assembly 200 is connected to the blade body 100 through the first elastic adhesive layer 220, thereby avoiding structural damage caused by a fixed connection method such as punching 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, and good corrosion resistance. The bonding method also has a certain buffering and shock-absorbing effect, which helps to protect the blade body 100 and the counterweight assembly 200.

[0036] The first elastic adhesive layer 220 includes an adhesive having a tensile modulus of less than 2 GPa, that is, the first elastic adhesive layer 220 includes an adhesive having 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 the material, which reflects the ability of the material to resist tensile deformation. The adhesive having a tensile modulus of less than 2 GPa has high flexibility and elasticity, and can better adapt to the slight deformation and displacement between the blade body 100 and the counterweight assembly 200. When the wind turbine blade is subjected to force, the deformation of the counterweight assembly 200 is isolated from the deformation of the blade body 100 by the first elastic adhesive layer 220, so that the counterweight assembly 200 and the blade body 100 are deformed independently, avoiding stress concentration and stress accumulation, and no stress concentration is generated around the counterweight assembly 200, thereby improving the connection stability and impact resistance of the counterweight assembly 200 and the blade body 100.

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

[0038] In the case of AB components, component A is the main agent, and component B is isocyanate, also known as a 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, trimers, and prepolymers of polyols of MDI, trimers and prepolymers of polyols of TDI, trimers of HDI, mixed trimers of HDI and TDI, and prepolymers of HDI and polyols.

[0039] For the single-component case: the component A used is mainly composed of a polyhydroxy compound, which can be a terminal hydroxyl polyether, a terminal hydroxyl polyester, 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 20000mPa.sec; the average functionality is 2 to 10.

[0040] In addition, in an embodiment of the present application, the first elastic adhesive layer 220 includes an adhesive having 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 in reducing stress concentration. When the modulus of the first elastic adhesive layer 220 is 0.001 GPa-0.1 GPa, it has a better effect in reducing stress concentration. The tensile modulus of the adhesive is 0.01 GPa-1 GPa, and the adhesive layer has high elasticity and flexibility, which can allow a larger deformation amount.

[0041] Continue to refer 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 close to the trailing edge can lower the overall center of gravity of the blade and improve the stability of the blade. A lower center of gravity makes the wind turbine blade more stable when rotating and under the action of wind, reduces shaking and vibration, and reduces the risk of structural fatigue.

[0048] Figure 2 A perspective view of a weight assembly 200 provided in some embodiments of the present application is shown; Figure 3 A top view of a weight assembly 200 having a fiber protective layer 230 provided in some embodiments of the present application is shown; Figure 4 A partial schematic diagram of the installation of the counterweight assembly 200 provided in some embodiments of the present application to the rib plate 103 is shown.

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

[0050] The fiber protective layer 230 can firmly wrap the counterweight assembly 200 on the blade body 100 to prevent the counterweight assembly 200 from being displaced during the rotation and vibration of the blade. The counterweight assembly 200 is limited to keep the position of the counterweight assembly 200 stable, and maintain the balance and stability of the wind turbine blade. A stable counterweight assembly 200 helps to improve the aerodynamic performance and structural strength of the wind turbine blade and reduce the 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 will be transmitted to the counterweight assembly 200 through the fiber protective layer 230. The fiber protective layer 230 can evenly disperse these stresses to avoid stress concentration in a local area of ​​the counterweight assembly 200, thereby reducing the risk of damage to the counterweight assembly 200. At the same time, the fiber protective layer 230 itself also has a certain tensile strength and toughness, can withstand part of the stress, and share the external force with the blade body 100, thereby improving the reliability of the entire wind turbine blade structure.

[0052] The material of the fiber protection layer 230 includes biaxial glass fiber fabric or organic fiber fabric, and the organic fiber fabric may 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] Furthermore, in an optional embodiment of the present application, the fiber protection layer includes biaxial glass fiber fabric, and the angle between the fiber direction of the biaxial glass fiber fabric and the force direction is within ±45 degrees, which can reduce the modulus of the counterweight assembly 200 in the 90° direction.

[0054] The angle between the fiber direction and the force direction is within the range of ±45 degrees, so that the fibers of the fiber protection layer 230 will bear the force components from different directions at the same time, so that the stress is no longer concentrated in a single direction, and the stress will be dispersed between the fibers of the fiber protection layer 230. For the counterweight assembly 200, stress dispersion can reduce the concentrated stress it bears 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 glass fiber fabric with a fiber direction of ±45°, so that the angle between the fiber direction and the force direction is ±45 degrees. When subjected to 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 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, and the second elastic adhesive layer 212 includes an adhesive having a tensile modulus less than 2 GPa.

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

[0058] The second elastic adhesive layer 212 with low modulus connects the multiple counterweights 211. When the multiple counterweights 211 are subjected to external force, the second elastic adhesive allows the multiple counterweights 211 to respond to the external force independently, without transferring stress to adjacent counterweights 211, and maintaining overall connectivity. The accumulation of stress in the entire counterweight assembly 200 is avoided, so that the stress borne by each counterweight 211 is always maintained 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 when used; it can also be multi-component or even single-component.

[0059] Figure 5 A partial schematic diagram of the installation of the counterweight assembly 200 provided in some other embodiments of the present application to the rib plate 103 is shown.

[0060] like 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 plate 103 through the first elastic adhesive layer 220, and the second counterweight layer 202 is bonded to the side of the first counterweight layer 201 away from the rib plate 103 through the third elastic adhesive layer 203; the first counterweight layer 201 and the second counterweight layer 202 each include at least two counterweight blocks 211 and a second elastic adhesive layer 212, and the multiple counterweight blocks 211 are arranged along a plane perpendicular to the chord length direction.

[0061] 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 epoxy, polyurethane, acrylic and other materials. Taking polyurethane adhesive as an example, it may include components A and B, and the two components are mixed evenly when used; it may also be a multi-component or even a single component. The counterweight 211 may be made of metal or a rubber material 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 away from the rib plate 103 through the third elastic adhesive layer 203. The second counterweight layer 202 can include multiple counterweight layers stacked along the chord length direction, and the multiple counterweight layers are connected by 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 by the second elastic adhesive layer 212. The number of counterweight blocks 211 in each counterweight layer can be the same or different. The mass and size of each counterweight block 211 can be the same or different.

[0063] In addition, in the embodiment 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] The first elastic adhesive layer 220 has a greater thickness and can be better connected to the blade body 100. The first elastic adhesive layer 220 first receives the stress transmitted by the blade body 100 and is subjected to the greatest stress. The 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 block 211. The counterweight block 211 has a small mass, so a relatively thinner adhesive can be used to achieve a stable connection to ensure that the counterweight assembly 200 has a large mass in a small volume.

[0065] Furthermore, in the embodiment of the present application, the thickness of the first elastic adhesive layer 220 ranges from 3 mm to 20 mm.

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

[0067] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A wind turbine blade, It is 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; 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 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, It is characterized in that The counterweight assembly includes at least two counterweight blocks and a second elastic adhesive layer filled between adjacent counterweight blocks, wherein 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is characterized in that The blade body comprises a rib plate disposed in the hollow cavity, the rib plate being connected between the windward surface shell and the leeward surface shell, and the counterweight assembly is at least mounted on the rib plate away from the leading edge of the blade body.

10. The wind turbine blade according to claim 9, It is 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.

11. The wind turbine blade according to claim 9, It is characterized in that 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 a 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 the second elastic adhesive layer, and the multiple counterweight blocks are arranged along a plane perpendicular to the chord length direction.

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