A wind turbine blade and a wind turbine generator

Abstract

The utility model provides a kind of wind power blade and wind generating set, the wind power blade includes blade main body and cable assembly, cable assembly includes cable and fastener, fastener is abutted on the outside of blade main body, cable is wound on the outside of blade main body along the circumference of blade main body, and both ends of cable are fixed on fastener.The wind power blade of the utility model can be by adding cable assembly in the blade root of blade main body, so that the cable of cable assembly is ringed to fasten blade root, can improve its carrying capacity before layered hidden danger appears, reduce layered risk;Damage can also be contained in the early stage of layering, prolong the service life of wind power blade.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, and in particular to a wind turbine blade and a wind turbine generator set. Background Technology

[0002] In recent years, wind power generation has developed rapidly as a clean energy source. Wind turbine blades are the core components for capturing wind energy, and their reliability directly determines the lifespan of the unit and the cost per kilowatt-hour. Currently, megawatt-class wind turbines generally use a composite material of "carbon fiber / glass fiber hybrid + epoxy / epoxy vinyl ester resin" at the blade root (the annular area connected to the pitch bearing and hub), and add a UD (unidirectional) reinforcement layer to withstand huge flapping, swaying, and centrifugal loads. However, service data and actual measurements show that the blade root remains a high-risk area for failures. Most early cracks, peeling, or fractures originate at the interface between the UD reinforcement layer and adjacent metal components (embedded bolts, flange steel rings, T-bolts, grounding copper braided layers, etc.), highlighting the delamination problem. Utility Model Content

[0003] The purpose of this utility model is to provide a wind turbine blade and a wind turbine generator set, which aims to solve the problem of layering at the blade root of existing wind turbine blades.

[0004] To solve the above-mentioned technical problems, the present invention provides a wind turbine blade, comprising: Blade body; A cable assembly, comprising a cable and a fastener, the fastener abutting against the outer side of the blade body, the cable being wound around the outer side of the blade body circumferentially, and both ends of the cable being fixed to the fastener.

[0005] In some embodiments, the cable assembly includes a plurality of cables spaced apart along the length of the blade body; and / or, The cable assembly includes two fasteners located on the same side of the blade body. The two fasteners are spaced apart in a direction perpendicular to the length direction of the blade body. A connector is provided between the two fasteners. The two ends of the cable are respectively fixed to the two fasteners.

[0006] In some embodiments, the connector includes a first screw connector and two second screw connectors, the two second screw connectors being respectively disposed at both ends of the fastener in the length direction of the blade body, the first screw connector being located between the two second screw connectors, and a cable being disposed between each second screw connector and the first screw connector.

[0007] In some embodiments, when the cable is loosened, two second screws are disposed between the two fasteners, and the first screw is separated from the two fasteners; when the cable is tightened, the first screw is disposed between the two fasteners, and the two second screws are separated from the two fasteners.

[0008] In some embodiments, the first screw connector extends along the interval direction of the two fasteners, and both ends of the first screw connector pass through the two fasteners respectively and are provided with two first locking nuts, the two first locking nuts respectively abutting the far end faces of the two fasteners that are far apart from each other.

[0009] In some embodiments, the two ends of the second screw connector pass through the two fasteners respectively and are provided with two second locking nuts, the two second locking nuts respectively abutting the far ends of the two fasteners that are far apart from each other, wherein: The fastener has a slotted hole through which the second screw thread passes, the slotted hole extending in a direction perpendicular to the length direction of the blade body and the spacing direction of the two fasteners; and / or, The portion of the second screw connector located between the two fasteners is arranged in an arc shape that bends away from the blade body.

[0010] In some embodiments, the fastener has a through mounting hole for the cable to pass through, a bushing is disposed in the mounting hole, and the bushing is fitted onto the cable, wherein: The bushing has anti-slip grooves on its inner circumferential side; and / or, The diameter of the mounting hole and the outer diameter of the bushing are set to gradually increase in the direction in which the cable passes through the fastener; and / or, Each of the two fasteners has a clamping element on its proximal end face, which is close to each other, and the clamping element abuts against the side of the bushing away from the distal end face of the fastener.

[0011] In some embodiments, the clamping element includes: The abutting portion abuts against the side of the bushing away from the distal end face of the fastener; The clamping portion is formed by bending and extending from both ends of the abutting portion toward the far end face of the fastener in a direction perpendicular to the length direction of the blade body and the spacing direction of the two fasteners. The two clamping portions abut against both sides of the fastener in a direction perpendicular to the length direction of the blade body and the spacing direction of the two fasteners.

[0012] In some embodiments, the blade body includes a blade root on which the cable assembly is disposed; and / or, a plurality of cable assemblies are disposed at intervals along the length direction of the blade body.

[0013] To achieve the above objectives, this utility model also provides a wind turbine generator set, including the aforementioned wind turbine blades.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The wind turbine blade of this invention can improve its load-bearing capacity and reduce the risk of delamination by adding a cable assembly to the blade root of the blade body, so that the cable of the cable assembly is circumferentially fastened to the blade root. It can also curb the spread of damage in the early stage of delamination and extend the service life of the wind turbine blade. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a schematic diagram of the structure of the wind turbine blade in an embodiment of this utility model; Figure 2 for Figure 1 Schematic diagram of the middle cable assembly; Figure 3 for Figure 2 Top view of the cable assembly; Figure 4 for Figure 2 A schematic diagram of the structure of the central fastener.

[0017] Explanation of reference numerals in the accompanying drawings of this utility model: Wind turbine blade 100, blade body 1, blade root 11, cable assembly 2, cable 21, fastener 22, waist-shaped hole 221, mounting hole 222, countersunk hole 223, receiving groove 224, connector 23, first screw connector 23a, second screw connector 23b, first locking nut 3a, second locking nut 3b, bushing 4, clamping member 5, abutment part 51, clamping part 52.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] This utility model provides a wind turbine blade. Figures 1 to 4 A preferred embodiment of the wind turbine blade provided by this utility model is shown.

[0023] Please see Figures 1 to 4 In some embodiments, the wind turbine blade 100 includes a blade body 1 and a cable assembly 2. The cable assembly 2 includes a cable 21 and a fastener 22. The fastener 22 abuts against the outside of the blade body 1. The cable 21 is wound around the outside of the blade body 1 along the circumference of the blade body 1. Both ends of the cable 21 are fixed to the fastener 22.

[0024] Specifically, a cable assembly 2 is provided on the blade body 1. The specific number of cable assemblies 2 can be set according to the actual situation. For example, there can be one cable assembly 2. Multiple cable assemblies 2 can also be provided at intervals along the length direction of the blade body 1. The length direction of the blade body 1 is the direction from the root 11 of the blade body 1 to the tip of the blade body 1 (not shown in the figure). The length direction of the blade body 1 is defined as the front-back direction below.

[0025] The specific location of the cable assembly 2 on the blade body 1 can be set according to the actual situation. Optionally, please refer to [link / reference needed]. Figures 1 to 4 In some embodiments, the blade body 1 includes a blade root 11, on which a cable assembly 2 is provided. One cable assembly 2 may be provided on the blade root 11; multiple cable assemblies 2 may also be provided at intervals along the length direction of the blade body 1 on the blade root 11. The following description will take the case of a cable assembly 2 being provided on the blade root 11 as an example.

[0026] The cable assembly 2 includes a cable 21 and a fastener 22. The cable 21 is circumferentially wound around the blade root 11 and then fixedly connected to the fastener 22 at both ends, allowing the cable 21 to be wound and fixed to the blade root 11. This provides circumferential constraint to the blade root 11, applying circumferential prestress to it. This circumferential prestress forms a uniform compressive stress field within the blade root 11. When external loads (such as internal pressure or radial force) are applied, the circumferential prestress is initially counteracted, delaying the appearance of tensile stress. The circumferential prestress applies normal pressure, increasing the interfacial force of the fiberglass layer at the blade root 11, delaying crack initiation, and reducing crack propagation rate.

[0027] The wind turbine blade 100 can use the cable assembly 2 to apply preload around the blade root 11, providing normal prestress at the composite interface and preventing delamination of the composite layers at the blade root 11. Similarly, for the composite interface of the blade root 11 where cracks have already formed, the circumferential preload constraint of the cable assembly 2 on the blade root 11 can increase the cohesive force at the crack tip, preventing the blade root 11 from developing new cracks, greatly slowing down the propagation rate of existing cracks, and extending the service life of the wind turbine blade 100. Furthermore, applying preload to the blade root 11 using the cable assembly 2 is convenient, involves simple equipment, and is relatively time-efficient.

[0028] The wind turbine blade 100 of this utility model can improve its load-bearing capacity and reduce the risk of delamination before the delamination occurs by adding a cable assembly 2 to the blade root 11 of the blade body 1, so that the cable 21 of the cable assembly 2 is circumferentially fastened to the blade root 11. It can also curb the expansion of damage in the early stage of delamination and extend the service life of the wind turbine blade 100.

[0029] The specific number of cables 21 included in each cable assembly 2 can be set according to actual conditions. For example, each cable assembly 2 can have one or more cables 21. Optionally, please refer to Figures 1 to 4 In some embodiments, the cable assembly 2 includes a plurality of cables 21 spaced apart along the length of the blade body 1, which is beneficial to strengthen the blade root 11 as a whole by circumferential prestress. The following will take the example of the cable assembly 2 including two cables 21 spaced apart along the length of the blade body 1.

[0030] Similarly, the specific number of fasteners 22 included in each cable assembly 2 can be set according to actual conditions. For example, each cable assembly 2 can be provided with one fastener 22 or multiple fasteners 22 fixedly connected. Optionally, please refer to Figures 1 to 4 In some embodiments, the cable assembly 2 includes two fasteners 22 located on the same side of the blade body 1, with the two fasteners 22 spaced apart in a direction perpendicular to the length direction of the blade body 1, and a connector 23 provided between the two fasteners 22. The two ends of the cable 21 are respectively fixed to the two fasteners 22.

[0031] Specifically, after the two ends of the cable 21 pass through the two fasteners 22 on opposite sides, a hydraulic tensioner or other powered tensioning device is used to pull the two ends of the cable 21 to tighten the cable 21 around the blade root 11 and apply a preload to the blade root 11. Finally, the two ends of the cable 21 are fixedly connected to the two fasteners 22 respectively. The following description will take the cable assembly 2 including two fasteners 22 as an example, and define the two fasteners 22 as being located on the lower side of the blade root 11, with the spacing between the two fasteners 22 being left and right.

[0032] The two fasteners 22 are fixedly connected by a connector 23. The specific style of the connector 23 can be set according to the actual situation. For example, the connector 23 can be a screw. Similarly, the specific number of connectors 23 between the two fasteners 22 can be set according to the actual situation. For example, there can be one connector 23 or multiple connectors 23 spaced apart along the length of the blade body 1.

[0033] Optionally, please refer to Figures 1 to 4 In some embodiments, the connector 23 includes a first screw connector 23a and two second screw connectors 23b. The two second screw connectors 23b are respectively disposed at both ends of the fastener 22 in the length direction of the blade body 1. The first screw connector 23a is located between the two second screw connectors 23b. A cable 21 is disposed between each second screw connector 23b and the first screw connector 23a.

[0034] Specifically, both the first screw connector 23a and the second screw connector 23b are double-ended screws. The first screw connector 23a, the second screw connector 23b, and the cables 21 are arranged at intervals along the front-to-back direction. The first screw connector 23a and the two cables 21 are both located between the two second screw connectors 23b, and the first screw connector 23a is located between the two cables 21. The two fasteners 22 abut against the left and right sides of the leaf root 11, respectively. The two fasteners 22 can be fixedly connected by one first screw connector 23a; the two fasteners 22 can also be fixedly connected by two second screw connectors 23b; or the two fasteners 22 can be fixedly connected by both one first screw connector 23a and two second screw connectors 23b simultaneously.

[0035] Optionally, please refer to Figures 1 to 4 In some embodiments, when the cable 21 is loosened, two second screws 23b are disposed between the two fasteners 22, and the first screw 23a is separated from the two fasteners 22; when the cable 21 is tightened, the first screw 23a is disposed between the two fasteners 22, and the two second screws 23b are separated from the two fasteners 22.

[0036] Specifically, during the installation of the cable assembly 2 onto the blade root 11, the two fasteners 22 can be first fixedly connected using two second threaded connectors 23b, without installing the first threaded connector 23a. Then, the cable 21 is wound around the blade root 11, tightened, and its two ends are fixed to the two fasteners 22. Finally, the first threaded connector 23a is installed, and the two previously installed second threaded connectors 23b are removed after the first threaded connector 23a is installed. In this way, the two second threaded connectors 23b only serve to fix the two fasteners 22 during the installation of the cable assembly 2. The assembled cable assembly 2 has only one first threaded connector 23a, ensuring coordinated deformation of the two cables 21 and uniform application of prestress.

[0037] Optionally, please refer to Figures 1 to 4 In some embodiments, the first screw connector 23a extends along the interval direction of the two fasteners 22, and the two ends of the first screw connector 23a pass through the two fasteners 22 respectively and are provided with two first locking nuts 3a. The two first locking nuts 3a abut against the far ends of the two fasteners 22 that are far apart from each other.

[0038] Specifically, the left end face of the left fastener 22 is the distal end face of the left fastener 22, and the right end face of the left fastener 22 is the proximal end face of the left fastener 22; the right end face of the right fastener 22 is the distal end face of the right fastener 22, and the left end face of the right fastener 22 is the proximal end face of the right fastener 22. The first screw connector 23a is a straight screw, and its left and right ends pass through the two fasteners 22 respectively. The left and right ends of the first screw connector 23a are respectively provided with two threaded first locking nuts 3a. The first locking nut 3a located at the left end of the first screw connector 23a abuts against the left end face of the left fastener 22, and the first locking nut 3a located at the right end of the first screw connector 23a abuts against the right end face of the right fastener 22. This achieves a fixed connection between the two fasteners 22 via the first screw connector 23a.

[0039] The fastener 22 typically has a through hole in the middle for the first screw 23a to pass through, for example, see [reference needed]. Figures 1 to 4 In some embodiments, the fastener 22 has a countersunk hole 223 in the middle for the first screw 23a to pass through, and the countersunk hole 223 can be used to accommodate the first locking nut 3a.

[0040] Optionally, please refer to Figures 1 to 4 In some embodiments, the two ends of the second screw connector 23b pass through the two fasteners 22 respectively and are provided with two second locking nuts 3b, the two second locking nuts 3b respectively abutting the far end faces of the two fasteners 22 that are far apart from each other.

[0041] Specifically, the left and right ends of the second screw connector 23b pass through the two fasteners 22 respectively, and the left and right ends of the second screw connector 23b are respectively provided with two threaded second locking nuts 3b. The second locking nut 3b provided at the left end of the second screw connector 23b abuts against the left end face of the fastener 22 on the left side, and the second locking nut 3b provided at the right end of the second screw connector 23b abuts against the right end face of the fastener 22 on the right side. In this way, the two fasteners 22 are fixedly connected by the second screw connector 23b.

[0042] The fastener 22 typically has a through hole in the middle for the second screw 23b to pass through; alternatively, please refer to [reference needed]. Figures 1 to 4 In some embodiments, the fastener 22 is provided with a waist-shaped hole 221 through which the second screw 23b passes. The waist-shaped hole 221 extends in a direction perpendicular to the length direction of the blade body 1 and the spacing direction of the two fasteners 22.

[0043] Specifically, the front and rear ends of the fastener 22 are respectively provided with two waist-shaped holes 221 extending vertically. The left and right ends of the second screw connector 23b pass through the two fasteners 22 through the waist-shaped holes 221. Thus, by providing waist-shaped holes 221 on the fastener 22, the installation position of the second screw connector 23b can be adjusted vertically.

[0044] Optionally, please refer to Figures 1 to 4 In some embodiments, the portion of the second screw 23b located between the two fasteners 22 is arranged in an arc shape that bends away from the blade body 1.

[0045] Specifically, the portion of the second screw connector 23b located between the two fasteners 22 (i.e., the middle part of the second screw connector 23b) is arranged in a downward-curved arc shape, so that the shape of the middle part of the second screw connector 23b matches the shape of the blade root 11, thus avoiding interference between the second screw connector 23b and the blade root 11.

[0046] Optionally, please refer to Figures 1 to 4 In some embodiments, the fastener 22 is provided with a through mounting hole 222 for the cable 21 to pass through, and a bushing 4 is provided in the mounting hole 222 and fitted onto the cable 21.

[0047] Specifically, each fastener 22 has two through-holes 222, and a bushing 4 is fixedly fitted into each mounting hole 222. The bushing 4 is fixedly fitted onto the cable 21, thus fixing one end of the cable 21 to the fastener 22 through the bushing 4. The inner circumferential side of the bushing 4 is usually provided with anti-slip grooves (not shown in the figure) and other anti-slip structures to increase the friction between the bushing 4 and the cable 21, thereby fixing the bushing 4 onto the cable 21.

[0048] Optionally, please refer to Figures 1 to 4 In some embodiments, the diameter of the mounting hole 222 and the outer diameter of the bushing 4 are set to gradually increase in the direction in which the cable 21 passes through the fastener 22.

[0049] Specifically, the diameter of the mounting hole 222 and the outer diameter of the bushing 4 are set to gradually increase from the far end face to the near end face of the fastener 22, so that the mating surface between the mounting hole 222 and the bushing 4 is a tapered surface, thereby realizing the installation limit of the bushing 4 and the fastener 22 in the left and right upward direction.

[0050] Optionally, please refer to Figures 1 to 4 In some embodiments, a clamping member 5 is provided on the proximal end face of the two fasteners 22 that are close to each other, and the clamping member 5 abuts against the side of the bushing 4 away from the distal end face of the fastener 22.

[0051] Specifically, each fastener 22 has two clamping members 5 on its proximal end face. The two clamping members 5 are respectively close to the mounting holes 222 on the fastener 22. Each clamping member 5 has a through hole for the cable 21 to pass through. Each clamping member 5 abuts against the side of the bushing 4 in the corresponding mounting hole 222 away from the far end face of the fastener 22, thereby preventing the bushing 4 from disengaging from the mounting hole 222. The clamping members 5 can be fixed to the fastener 22 by means of screws or other methods.

[0052] Further, please refer to Figures 1 to 4 In some embodiments, the clamping member 5 includes an abutment portion 51 and two clamping portions 52. The abutment portion 51 abuts against the side of the bushing 4 away from the distal end face of the fastener 22. The two clamping portions 52 are formed by bending and extending from both ends of the abutment portion 51 in a direction perpendicular to the length direction of the blade body 1 and the spacing direction of the two fasteners 22 toward the distal end face of the fastener 22. The two clamping portions 52 abut against both sides of the fastener 22 in a direction perpendicular to the length direction of the blade body 1 and the spacing direction of the two fasteners 22.

[0053] Specifically, the abutment portion 51 is positioned opposite the fastener 22, and has a through hole for the cable 21 to pass through. The abutment portion 51 abuts against the side of the bushing 4 furthest from the fastener 22. Two clamping portions 52 are respectively located at the upper and lower ends of the abutment portion 51, so that the clamping member 5 is arranged in a C-shape. The two clamping portions 52 abut against the upper and lower sides of the fastener 22, thus achieving vertical positioning of the clamping member 5 and the fastener 22. A receiving groove 224 for accommodating the abutment portion 51 may be provided on the proximal end face of the fastener 22.

[0054] This utility model also provides a wind turbine generator set, which includes wind turbine blades. Since the wind turbine blades adopt the technical solutions of the above embodiments, they have the beneficial effects brought about by the technical solutions of the above embodiments.

[0055] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A wind turbine blade, characterized in that, include: Blade body; A cable assembly, comprising a cable and a fastener, the fastener abutting against the outer side of the blade body, the cable being wound around the outer side of the blade body circumferentially, and both ends of the cable being fixed to the fastener.

2. The wind turbine blade according to claim 1, characterized in that, The cable assembly includes a plurality of cables spaced apart along the length of the blade body; and / or, The cable assembly includes two fasteners located on the same side of the blade body. The two fasteners are spaced apart in a direction perpendicular to the length direction of the blade body. A connector is provided between the two fasteners. The two ends of the cable are respectively fixed to the two fasteners.

3. The wind turbine blade according to claim 2, characterized in that, The connector includes a first screw connector and two second screw connectors. The two second screw connectors are respectively disposed at both ends of the fastener in the length direction of the blade body. The first screw connector is located between the two second screw connectors. The cable is disposed between each second screw connector and the first screw connector.

4. The wind turbine blade according to claim 3, characterized in that, When the cable is released, the two second screws are positioned between the two fasteners, and the first screw is separated from the two fasteners; when the cable is tightened, the first screw is positioned between the two fasteners, and the two second screws are separated from the two fasteners.

5. The wind turbine blade according to claim 3, characterized in that, The first screw connector extends along the interval between the two fasteners. Both ends of the first screw connector pass through the two fasteners and are provided with two first locking nuts. The two first locking nuts abut against the far ends of the two fasteners that are far apart from each other.

6. The wind turbine blade according to claim 3, characterized in that, The two ends of the second screw connector pass through the two fasteners respectively and are provided with two second locking nuts. The two second locking nuts abut against the far ends of the two fasteners that are far apart from each other, wherein: The fastener has a slotted hole through which the second screw thread passes, the slotted hole extending in a direction perpendicular to the length direction of the blade body and the spacing direction of the two fasteners; and / or, The portion of the second screw connector located between the two fasteners is arranged in an arc shape that bends away from the blade body.

7. The wind turbine blade according to claim 3, characterized in that, The fastener has a through mounting hole for the cable to pass through, and a bushing is provided in the mounting hole. The bushing is fitted onto the cable, wherein: The bushing has anti-slip grooves on its inner circumferential side; and / or, The diameter of the mounting hole and the outer diameter of the bushing are set to gradually increase in the direction in which the cable passes through the fastener; and / or, Each of the two fasteners has a clamping element on its proximal end face, which is close to each other, and the clamping element abuts against the side of the bushing away from the distal end face of the fastener.

8. The wind turbine blade according to claim 7, characterized in that, The clamping element includes: The abutting portion abuts against the side of the bushing away from the distal end face of the fastener; The clamping portion is formed by bending and extending from both ends of the abutting portion toward the far end face of the fastener in a direction perpendicular to the length direction of the blade body and the spacing direction of the two fasteners. The two clamping portions abut against both sides of the fastener in a direction perpendicular to the length direction of the blade body and the spacing direction of the two fasteners.

9. The wind turbine blade according to claim 1, characterized in that, The blade body includes a blade root, on which the cable assembly is disposed; and / or, multiple cable assemblies are disposed at intervals along the length direction of the blade body.

10. A wind turbine generator set, characterized in that, Including the wind turbine blades as described in any one of claims 1-9.

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