Blade, method for manufacturing blade and wind turbine generator set

Abstract

The present invention provides a blade, a method for manufacturing the blade and a wind turbine generator set. The blade includes an upper shell, a lower shell and a web supported between the upper shell and the lower shell, the web having a first end facing the upper shell and a second end facing the lower shell, and the blade also includes a damping member, the damping member is arranged between the first end of the web and the upper shell, and / or between the second end of the web and the lower shell. According to the present invention, by arranging the damping member between the end of the web and the blade shell, the damping performance of the blade can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a blade, a method for manufacturing the blade and a wind power generator set. Background Art

[0002] At present, the capacity of wind turbines has developed from small capacity to large capacity, and megawatt-class wind turbines have emerged. As the wind turbines become larger, the blades, which are the key load-bearing components of wind turbines, have also become longer, more flexible, and have become larger and larger, with blades that are tens of meters or even hundreds of meters long. The weight of the blades is also increasing, and this trend has made the centrifugal force and inertial force generated by the blades themselves non-negligible. At the same time, the development of blade flexibility will also lead to a decrease in the stiffness of the blades themselves, making the blades more susceptible to harmful vibrations under the action of external loads.

[0003] In wind farms with high wind speeds, strong winds, and frequent changes in direction, the frequency of blade breakage, unstable flutter, and abnormal swing is increasing, and the power generation loss caused by downtime cannot be ignored. Therefore, improving the overall damping performance of blades and reducing vibration and resonance are issues that need to be urgently addressed in blade development. Summary of the invention

[0004] The object of the present invention is to provide a blade with higher damping performance, a method for manufacturing the blade and a wind turbine generator set.

[0005] Another object of the present invention is to provide a blade, a method for manufacturing the blade, and a wind turbine generator set that can improve the bonding strength of the damping member.

[0006] Another object of the present invention is to provide a blade having good damping effect in a wide temperature range, a method for manufacturing the blade, and a wind turbine generator set.

[0007] According to one embodiment of the present invention, a blade is provided, which includes an upper shell, a lower shell and a web supported between the upper shell and the lower shell, the web having a first end facing the upper shell and a second end facing the lower shell, and the blade also includes a damping member, which is arranged between the first end of the web and the upper shell, and / or between the second end of the web and the lower shell.

[0008] Optionally, the damping member may cover the first end of the web and / or the second end of the web.

[0009] Optionally, the damping member may be in a concave shape to cover the first end and / or the second end of the web and fit with the inner surface of the upper shell and / or the lower shell.

[0010] Optionally, in the span direction of the blade, the damping member may be arranged at a position corresponding to the middle and / or the blade tip of the blade. In the span direction of the blade, the damping member may be arranged continuously or intermittently.

[0011] Optionally, the thickness of the damping element may be 2 mm-100 mm.

[0012] Optionally, the damping element may include a viscoelastic damping body and a viscoelastic damping glue covering the viscoelastic damping body.

[0013] Optionally, the thickness of the viscoelastic damping body may be 1 mm-50 mm, and the thickness of the viscoelastic damping glue may be 0.5 mm-25 mm.

[0014] Optionally, the viscoelastic damping body may include a viscoelastic damping material, a modified filler and a coupling agent. The viscoelastic damping glue may include a graft copolymer. The weight of the modified filler is 5%-30% of the weight of the viscoelastic damping material, and the weight of the coupling agent is 0.5%-3% of the total weight of the viscoelastic damping material and the modified filler.

[0015] Optionally, the modified filler may be at least one of a plate-like filler, a spherical filler and a fibrous filler, and the graft copolymer may include polyurethane.

[0016] According to another aspect of the present invention, a method for manufacturing a blade is provided. The blade may include a web. The manufacturing method may include covering an end portion of the web with a damping member.

[0017] Optionally, the damping element is formed by coating the viscoelastic damping adhesive on the viscoelastic damping body.

[0018] Optionally, the method for forming a viscoelastic damping body may include: mixing a viscoelastic damping material, a modified filler and a coupling agent, wherein the weight of the modified filler is 5%-30% of the weight of the viscoelastic damping material, and the weight of the coupling agent is 0.5%-3% of the total weight of the viscoelastic damping material and the modified filler; relaxing the mixed mixture; and pressing the relaxed mixture into a sheet.

[0019] Optionally, the method for forming the viscoelastic damping adhesive may include: dehydrating the polymer constituting the viscoelastic damping adhesive; grafting the dehydrated polymer; thickening the grafted polymer; and adding a curing agent to the thickened polymer to present the viscoelastic damping adhesive as a solvent-free two-component.

[0020] Optionally, the step of wrapping the end of the web with the damping member may include: applying viscoelastic damping glue to all surfaces of the viscoelastic damping body; after the viscoelastic damping glue is cured, laying the cured damping member in the web mold and at positions corresponding to the two ends of the web, and bending the damping member into an L shape; forming a web ply, with the two ends of the web ply abutting against the L-shaped damping member; further bending the damping member into a concave shape to wrap the end of the web ply; injecting resin and curing the resin to form a damping member-web integrated structure.

[0021] Optionally, the step of wrapping the end of the web with the damping member may include: applying viscoelastic damping glue to all surfaces of the viscoelastic damping body; before curing the viscoelastic damping glue, laying the uncured damping member in the web mold and at positions corresponding to the two ends of the web, and bending the damping member into an L shape; forming a web ply, with the two ends of the web ply abutting against the L-shaped damping member; further bending the damping member into a concave shape to wrap the end of the web ply; pouring resin and curing the viscoelastic damping glue and the resin together to form a damping member-web integrated structure.

[0022] Optionally, the manufacturing method may further include bonding the damping element-web integrated structure to the blade shell.

[0023] According to another aspect of the present invention, a wind turbine generator set is provided. The wind turbine generator set comprises the blade as described above.

[0024] According to the above-described embodiment of the present invention, the damping performance of the blade can be improved by arranging the damping member between the end of the web (the web is the main load transfer component of the blade, transferring the load between the upper and lower shells of the blade) and the blade shell.

[0025] According to the embodiment of the present invention, by making the damping member wrap the end of the web, the contact area can be increased and the bonding firmness can be improved. Therefore, the risk of the damping structure being easily detached when the damping structure is arranged on the surface of the blade shell can be effectively solved. In addition, the blade mass will not be increased too much, and the blade movement reliability is improved.

[0026] According to an embodiment of the present invention, by providing a viscoelastic damping glue covering the viscoelastic damping body as a transition material, the bonding strength between the damping element and the resin of the web and the bonding strength between the damping element and the resin of the shell can be improved at the same time.

[0027] According to an embodiment of the present invention, by adding modified fillers to the viscoelastic damping material, the damping performance of the viscoelastic damping material can be greatly improved, and the damping temperature range can be widened, so that the viscoelastic damping material has good damping performance in a wider temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects and features of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a chord-wise cross-sectional view of a blade according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a damping member according to an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the arrangement position of the damping member in the span direction of the blade according to an embodiment of the present invention.

[0032] Description of the accompanying drawings: 10 is a blade, 11 is a blade shell, 11a is an upper shell, 11b is a lower shell, 12 is a web, 13 is a damping element, 13a is a viscoelastic damping body, and 13b is a viscoelastic damping glue. DETAILED DESCRIPTION

[0033] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like components throughout.

[0034] Blade including damping element

[0035] Figure 1 is a chord-wise cross-sectional view of a blade according to an embodiment of the present invention, Figure 2 is a schematic diagram of a damping member according to an embodiment of the present invention, Figure 3 Schematic diagram of the arrangement position of the damping member in the span direction of the blade according to an embodiment of the present invention.

[0036] like Figure 1 As shown, the blade 10 may include a blade shell 11 including an upper shell 11 a and a lower shell 11 b , and a web 12 is supported between the upper shell 11 a and the lower shell 11 b .

[0037] like Figure 1 and Figure 3 As shown, the blade 10 may include two webs 12, which may extend along the span direction of the blade 10 and have a first end facing the upper shell 11a and a second end facing the lower shell 11b. The first end and the second end of the web 12 are opposite to each other in the thickness direction of the blade 10.

[0038] According to an embodiment of the present invention, the blade 10 may further include a damping member 13, which may be disposed between the first end of the web 12 and the upper shell 11a, and / or between the second end of the web 12 and the lower shell 11b. Figure 1 , it is shown that the damping member 13 is arranged between the two ends of each web 12 and the blade shell 11, but the present invention is not limited thereto, and the damping member 13 may be arranged only between the end of one web 12 and the blade shell 11. In addition, the damping member 13 may also be arranged only between one end of the web 12 and the upper shell 11a or the lower shell 11b.

[0039] According to an embodiment of the present invention, by arranging the damping member 13 between the end of the web 12 and the blade shell 11, the damping performance of the blade can be improved. This is because the web is the main transmission component of the load on the blade, and the load is transmitted between the upper and lower shells of the blade, which effectively reduces the risk of load concentration and makes the force uniform and stable. When the blade is affected by external forces and swings, oscillates, and twists, the damping member between the shell and the web moves accordingly, and the vibration energy is converted into heat energy dissipation through the friction within and between the molecules of the material in the damping member. Therefore, arranging the damping member 13 between the end of the web 12 and the blade shell 11 can greatly improve the damping performance of the blade.

[0040] According to an embodiment of the present invention, the damping member 13 may cover the first end of the web 12 and / or the second end of the web 12. Preferably, the damping member 13 covers the first end and / or the second end of the web 12 in a concave shape.

[0041] According to an embodiment of the present invention, Figure 1 As shown, the upper surface or the lower surface of the damping member 13 may contact the upper shell 11a or the lower shell 11b, and may conform to the curved surface contour of the upper shell 11a or the lower shell 11b. Figure 2 The lower surface of the damping member 13 is a flat surface, but the present invention is not limited thereto, that is, the upper surface or the lower surface of the damping member 13 may have a curved surface shape that can fit with the upper shell 11a or the lower shell 11b.

[0042] According to an embodiment of the present invention, the damping member 13 may further extend from a portion disposed between the first end of the web 12 and the upper shell 11a and / or a portion disposed between the second end of the web 12 and the lower shell 11b to two side surfaces of the web 12 (two side surfaces opposite to each other in the chord direction) to form a concave shape, and the lengths extending on the two side surfaces may be the same or different.

[0043] According to the embodiment of the present invention, by making the damping member 13 wrap the end of the web 12, the contact area between the damping member 13 and the web 12 can be increased, and the bonding firmness can be improved. Therefore, the risk of the damping structure being easily detached when the damping structure is arranged on the surface of the blade shell can be effectively solved. In addition, the blade mass will not be increased too much, and the blade movement reliability is improved.

[0044] According to an embodiment of the present invention, Figure 3As shown, a plurality of damping members 13 may be intermittently arranged in the span direction of the blade 10. However, the present invention is not limited thereto, and the damping members 13 may be continuously arranged in the span direction of the blade 10. In addition, in the span direction of the blade 10, the arrangement position of the damping members 13 is not specifically limited. For example, the damping members 13 may be arranged in the middle of the blade 10, or may be arranged at the tip of the blade 10, or may be arranged at both the middle and tip of the blade 10. In addition, Figure 3 It is shown in FIG. 1 that the damping member 13 is only provided at a position corresponding to one web, however, the present invention is not limited thereto, and the damping member 13 may be provided at both webs.

[0045] According to an embodiment of the present invention, the thickness of the damping member 13 may be 2 mm-100 mm. When the thickness of the damping member 13 is less than 2 mm, the damping performance provided by the damping member 13 may be insufficient. When the thickness of the damping member 13 is greater than 100 mm, the weight of the blade 10 may be increased.

[0046] According to an embodiment of the present invention, the damping member 13 may have different thicknesses in the span direction of the blade 10 to accommodate transitional changes in thickness at different positions.

[0047] According to an embodiment of the present invention, the damping member 13 may include a viscoelastic damping body 13 a and a viscoelastic damping glue 13 b covering the viscoelastic damping body 13 a .

[0048] According to an embodiment of the present invention, the viscoelastic damping body 13a may include a viscoelastic damping material, a modified filler, and a coupling agent.

[0049] Optionally, the viscoelastic damping material may be at least one of nitrile rubber, chloroprene rubber, styrene-butadiene rubber, butyl rubber, natural rubber, brominated butyl rubber, and acrylate rubber.

[0050] According to an embodiment of the present invention, a modified filler can be added to the viscoelastic damping material. By adding the modified filler to the viscoelastic damping material, a large contact area can be provided between the viscoelastic damping material and the modified filler. When the material is subjected to an external force, a certain shear deformation occurs at the interface between the modified filler and the viscoelastic damping material, which plays a microscopic constraint role. The friction loss caused by the shear deformation on the microstructure is much greater than the loss energy of the tensile and compressive deformations, and thus the damping performance of the viscoelastic damping material can be greatly improved. On the other hand, since the modified filler can limit the movement of the molecular chains of the viscoelastic damping material, the hysteresis effect between the stress and strain of the polymer matrix is ​​increased, so that the glass transition temperature Tg of the viscoelastic damping material is increased, thereby broadening the damping temperature range, so that the viscoelastic damping material has good damping performance in a wider temperature range.

[0051] Optionally, the modified filler may be at least one of a flaky filler, a spherical filler and a fibrous filler. Optionally, the flaky filler may be at least one of sericite, graphite flakes, glass flakes and talcum powder. Optionally, the spherical filler may be carbon black particles, and the fibrous filler may be carbon nanotubes. However, the modified filler according to the present invention is not limited thereto, and any filler that can improve the damping performance of the viscoelastic damping material and can improve its damping temperature range can be applied to the present invention.

[0052] According to an embodiment of the present invention, the weight of the modified filler may be 5%-30% of the weight of the viscoelastic damping material. When the weight of the modified filler is less than 5% of the weight of the viscoelastic damping material, the effect of improving the damping performance of the viscoelastic damping material and improving its damping temperature range may be insufficient. When the weight of the modified filler is greater than 30% of the weight of the viscoelastic damping material, the weight of the viscoelastic damping material will be relatively small.

[0053] According to an embodiment of the present invention, a coupling agent may be added to the viscoelastic damping material. By adding the coupling agent to the viscoelastic damping material, the interaction between the modified filler and the viscoelastic damping material may be further improved.

[0054] Optionally, the coupling agent may be at least one of a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent. However, the present invention is not limited thereto.

[0055] According to an embodiment of the present invention, the weight of the coupling agent may be 0.5%-3% of the total weight of the viscoelastic damping material and the modified filler. When the weight of the coupling agent is less than 0.5% of the total weight of the viscoelastic damping material and the modified filler, the effect of improving the interaction between the modified filler and the viscoelastic damping material may be insufficient. When the weight of the coupling agent is greater than 3% of the total weight of the viscoelastic damping material and the modified filler, the effect of further improving the interaction between the modified filler and the viscoelastic damping material will no longer be obvious.

[0056] According to an embodiment of the present invention, the damping member 13 may include a viscoelastic damping adhesive 13b covering a viscoelastic damping body 13a. Figure 2 As shown, the viscoelastic damping adhesive 13b can cover the entire outer surface of the viscoelastic damping body 13a.

[0057] According to the embodiment of the present invention, by providing the viscoelastic damping glue 13b covering the viscoelastic damping body 13a as a transition material, the bonding strength between the damping element 13 and the resin of the web 12 and the bonding strength between the damping element and the resin of the shell can be improved at the same time.

[0058] According to an embodiment of the present invention, the viscoelastic damping adhesive 13b may include a graft copolymer. A graft copolymer refers to a copolymer formed by adding a grafting agent to a polymer. According to the present invention, by introducing a side group on the molecular chain of the polymer by grafting, the friction resistance that needs to be overcome during molecular movement is increased, so more energy is consumed, and the damping performance of the material is improved. In addition, since the friction resistance that needs to be overcome during molecular movement increases, a higher temperature is required to achieve the ability of the molecules to move freely, so the glass transition temperature Tg of the material is increased, thereby broadening the damping temperature range of the material.

[0059] Optionally, the polymer may be at least one of polyurethane, epoxy resin, damped acrylic resin, and damped vinyl ester resin. However, the present invention is not limited thereto, and any material having good damping performance, a certain thixotropic viscosity characteristic, and good interfacial compatibility with a high molecular weight viscoelastic damping material and a low molecular weight resin may be applied to the present invention.

[0060] Preferably, the polymer may be polyurethane. As a block copolymer composed of a soft segment and a hard segment, polyurethane has a relatively poor micro-phase compatibility with the hard segment due to the large structural differences between the soft segment and the hard segment, which results in a relatively high loss factor and good damping and vibration reduction performance. It is precisely because of the presence of the soft segment and the hard segment that polyurethane has good compatibility with both low molecular weight resins and high molecular weight viscoelastic damping materials, so the resin of the web 12 and the viscoelastic damping material can be better bonded. In addition, the molecular structure of polyurethane is highly designable, which is conducive to the structural design, modification and application of polyurethane as a high-performance damping material, and can be applied on a large scale on large megawatt blades.

[0061] Optionally, the grafting agent can be at least one of methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), β-hydroxypropyl acrylate (HPA), and β-hydroxyethyl acrylate (HEA). According to the present invention, when acrylic acid is used to graft polyurethane, polar and functional side groups can be introduced into the polyurethane molecular chain. Due to the presence of carboxyl groups in acrylic acid and the effect of hydrogen bonds, the crystallization of polyurethane is inhibited, the molecular structure of the main chain is destroyed, and the molecular weight is increased, thereby improving the toughness and bonding properties of polyurethane, and improving thermal stability.

[0062] According to the embodiment of the present invention, the thickness of the viscoelastic damping body 13a may be 1 mm-50 mm, and the thickness of the viscoelastic damping adhesive 13b may be 0.5 mm-25 mm.

[0063] Method for manufacturing a blade including a damping element

[0064] Hereinafter, a method for manufacturing a blade including a damper according to an embodiment of the present invention will be described, and the same description as above will be omitted to avoid redundancy.

[0065] The method for manufacturing a blade according to an embodiment of the present invention may include covering the end of the web 12 with the damping member 13 .

[0066] According to an embodiment of the present invention, the damping element may be formed by coating the viscoelastic damping adhesive 13b on the viscoelastic damping body 13a.

[0067] According to an embodiment of the present invention, a method for forming a viscoelastic damping body 13a includes: mixing a viscoelastic damping material, a modified filler and a coupling agent, wherein the weight of the modified filler is 5%-30% of the weight of the viscoelastic damping material, and the weight of the coupling agent is 0.5%-3% of the total weight of the viscoelastic damping material and the modified filler; relaxing the mixed mixture; and pressing the relaxed mixture into a sheet.

[0068] In the mixing step, the viscoelastic damping material and the modified filler can be mixed and added to an internal mixer, and then a coupling agent is added and internally mixed at 20° C.-60° C. for 5 min-30 min. However, the present invention is not limited thereto, and the above three materials can also be mixed using equipment such as an open mill, a kneading machine, and a rubber extruder.

[0069] In the relaxation step, the kneaded mixture can be left for 2h-8h to relax the molecular chains of the viscoelastic material and achieve uniform plasticity.

[0070] In the step of pressing the sheet, the relaxed mixture can be pressed into a sheet of 1 mm to 50 mm by a calender, and release paper can be attached to both sides for subsequent use.

[0071] According to an embodiment of the present invention, a method for forming a viscoelastic damping adhesive 13b includes: dehydrating a polymer constituting the viscoelastic damping adhesive; grafting the dehydrated polymer; thickening the grafted polymer; and adding a curing agent to the thickened polymer to make the viscoelastic damping adhesive present as a solvent-free two-component.

[0072] In the dehydration step, the polymer may be placed in an environment of a certain temperature (eg, 100° C.) and stirred under vacuum for dehydration for a certain period of time (eg, 2 h).

[0073] In the grafting step, the dehydrated polymer and the grafting agent can be mixed in a certain proportion and added to a reactor, an initiator is added, and the reaction is carried out at 60-80° C. for 1 h-3 h to obtain a graft copolymer. According to the present invention, the weight of the grafting agent can be 5%-50% of the weight of the polymer. According to the present invention, the weight of the initiator can be 0.1%-1% of the total weight of the polymer and the grafting agent. According to the present invention, the initiator can be K2S2O8, but the present invention is not limited thereto.

[0074] In the thickening step, a thickener may be used to adjust the viscosity of the polymer to 2000 mPa·s-5000 mPa·s. Optionally, the thickener may be at least one of modified cellulose, polymer emulsion, mineral thickener, natural gum, and metal oxide.

[0075] In the step of presenting, a curing agent can be added to the thickened polymer to present the viscoelastic damping adhesive in a solvent-free two-component form. The viscoelastic damping adhesive presented in a solvent-free two-component form can have certain scraping properties and thixotropy, can be cured at room temperature, is relatively convenient to construct, and has certain viscosity.

[0076] According to an embodiment of the present invention, the step of wrapping the end of the web 12 with the damping member 13 may include: applying the viscoelastic damping glue 13b to all surfaces of the viscoelastic damping body 13a; after the viscoelastic damping glue 13b is cured, laying the cured damping member 13 in the web mold and at positions corresponding to the two ends of the web, and bending the damping member 13 into an L shape; forming a web ply, with the two ends of the web ply abutting against the L-shaped damping member 13; further bending the damping member 13 into a concave shape to wrap the end of the web ply; injecting resin (for example, epoxy resin or polyurethane resin) and curing the resin to form an integrated structure of the damping member 13-web 12.

[0077] However, the present invention is not limited thereto. As another example, the step of wrapping the end of the web 12 with the damping member 13 may include: applying the viscoelastic damping glue 13b to all surfaces of the viscoelastic damping body 13a; before curing the viscoelastic damping glue 13b, laying the uncured damping member 13 in the web mold and at positions corresponding to the two ends of the web, and bending the damping member 13 into an L shape; forming a web ply, with the two ends of the web ply abutting against the L-shaped damping member 13; further bending the damping member 13 into a concave shape to wrap the end of the web ply; and pouring resin and curing the viscoelastic damping glue and the resin together to form an integrated structure of the damping member 13-web 12. That is, according to this example, the viscoelastic damping glue and the resin of the damping member 13 can be cured together, thereby saving the curing process and curing time.

[0078] After the damping member 13-web 12 integrated structure is formed, the damping member 13-web 12 integrated structure can be bonded to the blade shell 11. The damping member 13-web 12 integrated structure can be bonded to the blade shell 11 using a structural adhesive. Optionally, the structural adhesive can be at least one of an epoxy structural adhesive, a polyurethane structural adhesive, a vinyl epoxy structural adhesive, and an acrylic structural adhesive. Optionally, the thickness of the structural adhesive can be 1 mm-10 mm. Optionally, the tensile shear strength of the structural adhesive can be 15-40 MPa.

[0079] like Figure 3 As shown in FIG. 1 , the damping member 13 may be disposed at a position corresponding to the middle position in the span direction of the blade 10, or at a position close to the tip of the blade 10. However, the present invention is not limited thereto, and the damping member 13 may be disposed only at a position corresponding to the middle position in the span direction of the blade 10, or at a position close to the tip of the blade 10. In addition, as Figure 3 As shown, in the span direction of the blade 10, the damping member 13 is divided into several sections of the same or different lengths. However, the present invention is not limited thereto, and in the span direction of the blade 10, the damping member 13 may be a continuous whole. According to an embodiment of the present invention, the arrangement position of the damping member 13 in the span direction of the blade 10 and whether it is continuous may be determined according to the damping performance requirements and structural design requirements, without being subject to specific restrictions.

[0080] in addition, Figure 3 It is shown in FIG. 1 that the damping member 13 is only provided at a position corresponding to one web, however, the present invention is not limited thereto, and the damping member 13 may be provided at both webs.

[0081] The above describes a method for manufacturing a blade including a damping member. However, it should be understood that in the above manufacturing method, in the case where there is no obvious sequence, the execution order of the above method can be adjusted.

[0082] In addition, it should be understood that the above method is provided to prove that the blade including the damping member according to the present invention can be realized, and blades with the same structure as the blade of the present invention manufactured by other methods are also within the protection scope of the present invention.

[0083] Hereinafter, a specific example of the method for manufacturing a blade according to the present invention will be described.

[0084] Specific examples

[0085] Add nitrile rubber, sericite and silane coupling agent into an internal mixer at a weight ratio of 100:20:2, mix at 50°C for 20 minutes, and then leave for 6 hours to relax the material. Then use a calender to press the mixture into a sheet with a thickness of 5 mm, and attach release paper on both sides to obtain a viscoelastic damping body.

[0086] The polyurethane resin was placed in a vacuum stirring dehydration environment at 100°C for 2 hours, and mixed with acrylic acid (AA) at a weight ratio of 100:10 and added to the reactor. K2S2O8 was added as an initiator with a weight of 0.5% of the total weight of the polyurethane resin and acrylic acid (AA), and reacted at 80°C for 2 hours. Then, carboxymethyl cellulose was used to adjust the grafted polyurethane resin to a viscosity of 3000mPa·s, and a grafted modified polyurethane viscoelastic damping glue was obtained as a transition material between the resins of the damping member 13 and the web 12.

[0087] The transition material is coated on the outer surface of the viscoelastic damping body with a coating thickness of 2.5 mm, and is cured and formed at room temperature to obtain a damping component.

[0088] The cured damping member is placed in the web forming mold, specifically at the positions corresponding to the two ends of the web 12, so that the damping member can be bent into an L shape. Then, a web ply is formed, and the two ends of the web ply are against the L-shaped damping member 13. The damping member 13 is further bent into a concave shape to wrap the ends of the web ply. Epoxy resin is poured and cured to form a damping member 13-web 12 integrated structure.

[0089] The integral structure of the injection-molded damping member 13 and the web 12 is bonded to the blade shell by means of structural adhesive to obtain a blade with a damping member. The structural adhesive is epoxy structural adhesive, the thickness of which is 3 mm, and the tensile shear strength is 30 MPa.

[0090] Wind turbines

[0091] A wind turbine generator system according to an embodiment of the present invention may include a blade including a damping member as described above.

[0092] The following are the beneficial effects that can be achieved by the present invention. However, the beneficial effects of the present invention are not limited thereto, and other beneficial effects can also be easily obtained based on the above description.

[0093] According to the above-described embodiment of the present invention, the damping performance of the blade can be improved by arranging the damping member between the end of the web (the web is the main load transfer component of the blade, transferring the load between the upper and lower shells of the blade) and the blade shell.

[0094] According to the embodiment of the present invention, by making the damping member wrap the end of the web, the contact area can be increased and the bonding firmness can be improved. Therefore, the risk of the damping structure being easily detached when the damping structure is arranged on the surface of the blade shell can be effectively solved. In addition, the blade mass will not be increased too much, and the blade movement reliability is improved.

[0095] According to an embodiment of the present invention, by providing a viscoelastic damping glue covering the viscoelastic damping body as a transition material, the bonding strength between the damping element and the resin of the web and the bonding strength between the damping element and the resin of the shell can be improved at the same time.

[0096] According to an embodiment of the present invention, by adding modified fillers to the viscoelastic damping material, the damping performance of the viscoelastic damping material can be greatly improved, and the damping temperature range can be widened, so that the viscoelastic damping material has good damping performance in a wider temperature range.

[0097] Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. However, it should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims. In addition, the various embodiments described above may be combined with each other without contradicting each other.

Claims

1. A blade, the blade (10) comprising an upper shell (11a), a lower shell (11b), and a web (12) supported between the upper shell (11a) and the lower shell (11b), the web (12) having a first end facing the upper shell (11a) and a second end facing the lower shell (11b), characterized in that: The blade (10) further comprises a damping member (13), wherein the damping member (13) is arranged between the first end of the web (12) and the upper shell (11a), and / or between the second end of the web (12) and the lower shell (11b); The damping element (13) comprises a viscoelastic damping body (13a) and a viscoelastic damping glue (13b) covering the viscoelastic damping body (13a).

2. The blade according to claim 1, characterized in that The damping member (13) covers the first end of the web (12) and / or the second end of the web (12).

3. The blade according to claim 2, characterized in that The damping member (13) is in a concave shape, covers the first end and / or the second end of the web (12), and fits with the inner surface of the upper shell (11a) and / or the lower shell (11b).

4. The blade according to claim 1, characterized in that In the span direction of the blade (10), the damping member (13) is arranged at a position corresponding to the middle part and / or the blade tip of the blade (10). Wherein, in the span direction of the blade (10), the damping element (13) is arranged continuously or intermittently.

5. The blade according to claim 1, characterized in that The thickness of the damping member (13) is 2 mm-100 mm.

6. The blade according to claim 1, characterized in that The thickness of the viscoelastic damping body (13a) is 1 mm to 50 mm, and the thickness of the viscoelastic damping glue (13b) is 0.5 mm to 25 mm.

7. The blade according to claim 1, characterized in that The viscoelastic damping body (13a) comprises a viscoelastic damping material, a modified filler and a coupling agent, and the viscoelastic damping glue (13b) comprises a graft copolymer. The weight of the modified filler is 5%-30% of the weight of the viscoelastic damping material, and the weight of the coupling agent is 0.5%-3% of the total weight of the viscoelastic damping material and the modified filler.

8. The blade according to claim 7, characterized in that The modified filler is at least one of a plate-like filler, a spherical filler and a fibrous filler, and the graft copolymer comprises polyurethane.

9. A method for manufacturing a blade, the blade comprising a web, characterized in that: The manufacturing method comprises wrapping a damping member (13) around the end of the web (12); wherein the damping member (13) is formed by wrapping a viscoelastic damping adhesive (13b) on a viscoelastic damping body (13a).

10. The manufacturing method according to claim 9, characterized in that: The method of forming the viscoelastic damping body (13a) comprises: Mixing a viscoelastic damping material, a modified filler and a coupling agent, wherein the weight of the modified filler is 5%-30% of the weight of the viscoelastic damping material, and the weight of the coupling agent is 0.5%-3% of the total weight of the viscoelastic damping material and the modified filler; Relaxing the kneaded mixture; The relaxed mixture is pressed into sheets.

11. The manufacturing method according to claim 10, characterized in that: The method for forming the viscoelastic damping adhesive (13b) comprises: dehydrating the polymer constituting the viscoelastic damping glue; grafting the dehydrated polymer; thickening the grafted polymer; A curing agent is added to the thickened polymer so that the viscoelastic damping adhesive is presented as a solvent-free two-component.

12. The manufacturing method according to claim 11, characterized in that: The step of wrapping the damping member (13) around the end of the web (12) comprises: Applying the viscoelastic damping glue (13b) to all surfaces of the viscoelastic damping body; After the viscoelastic damping adhesive (13b) is cured, the cured damping member (13) is laid in the web mold and laid at positions corresponding to the two ends of the web (12), and the damping member (13) is bent into an L shape; forming a web ply, with both ends of the web ply abutting against the L-shaped damping member (13); The damping member (13) is further bent into a concave shape to wrap around the end of the web ply; Resin is poured and cured to form a damping member (13)-web (12) integrated structure.

13. The manufacturing method according to claim 11, characterized in that: The step of wrapping the damping member (13) around the end of the web (12) comprises: Applying the viscoelastic damping glue (13b) to all surfaces of the viscoelastic damping body (13a); Before the viscoelastic damping adhesive (13b) is cured, an uncured damping member (13) is laid in a web mold and laid at positions corresponding to the two ends of the web (12), and the damping member (13) is bent into an L shape; forming a web ply, with both ends of the web ply abutting against the L-shaped damping member (13); The damping member (13) is further bent into a concave shape to wrap around the end of the web ply; Resin is poured and the viscoelastic damping glue (13b) and the resin are cured together to form a damping member (13)-web (12) integrated structure.

14. The manufacturing method according to claim 12 or 13, characterized in that: The manufacturing method further comprises bonding the damping member (13)-web (12) integrated structure to the blade shell (11).

15. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a blade (10) according to any one of claims 1-8.

Images