Connecting disc component, wind power blade and wind generating set

Abstract

The invention relates to a connecting disc component, a wind power blade and a wind generating set, the wind power blade comprises a blade main body, a lightning protection layer and a connecting assembly, a cavity is defined by the blade main body, and a conductive device is arranged in the cavity; the lightning protection layer is arranged on the blade main body and is adjacent to the outer surface of the blade main body; the connecting assembly comprises a connecting disc part and a first fastener, the connecting disc part comprises a first disc part and a second disc part, the second disc part is located between the first disc part and the conductive device, the first disc part and the second disc part are connected, and the lightning protection layer is clamped between the first disc part and the second disc part; one end of the first fastening piece penetrates through the first disc piece, the second disc piece and the blade body to be electrically connected with the conductive device, and the other end of the first fastening piece abuts against the first disc piece. According to the technical scheme, the reliability of electric connection between the lightning protection layer and the conductive device can be improved, and the effectiveness of the lightning protection effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of wind power generation, in particular to a connecting disc component, a wind power blade and a wind turbine generator system. BACKGROUND

[0002] As the highest installed component in a wind turbine generator system, the blade is the primary target of lightning strikes, and therefore a lightning protection system is usually arranged on the blade to reduce damage to the blade caused by lightning strikes.

[0003] In the related art, a metal mesh is arranged on the surface of a wind power blade, and the metal mesh is connected to a down conductor or a main beam in the blade through a connecting piece to achieve the effect of lightning protection. However, the electrical connection between the metal mesh and the connecting piece is not reliable, which affects the effectiveness of lightning protection. SUMMARY

[0004] The purpose of the present disclosure is to provide a connecting disc component, a wind power blade and a wind turbine generator system, which can improve the electrical connection reliability between the lightning protection layer and the conductive device and ensure the effectiveness of lightning protection.

[0005] According to one aspect of the present disclosure, a wind power blade is provided, comprising a blade body, a lightning protection layer and a connecting assembly, the blade body being provided with a conductive device; the lightning protection layer is arranged on the blade body and adjacent to the outer surface of the blade body; the connecting assembly comprises a connecting disc component and a first fastener, wherein the connecting disc component comprises a first disc and a second disc, the second disc is located between the first disc and the conductive device, the first disc and the second disc are connected and clamp the lightning protection layer between the first disc and the second disc, one side of the first disc adjacent to the second disc is a first matching surface, at least the peripheral area of the first matching surface is inclinedly arranged in a direction away from the second disc; one end of the first fastener is electrically connected to the conductive device through the first disc, the second disc and the blade body, and the other end of the first fastener abuts against the first disc.

[0006] The technical scheme provided by the present disclosure is characterized in that a lightning protection layer is arranged at the outer surface of the blade body, thereby forming a Faraday cage on the surface of the blade body by the lightning protection layer, shielding external electric field and electromagnetic pulse, preventing direct action of external lightning field on the internal structure, avoiding lightning-induced partial discharge or arc discharge inside the blade body, and protecting the mechanical and electrical properties of the wind turbine blade. Meanwhile, the connecting disc component is electrically connected by clamping the lightning protection layer with the first disc and the second disc, the lightning protection layer can be compacted by the clamping force of the first disc and the second disc, the contact area between the lightning protection layer and the connecting disc component is increased, the contact resistance is effectively reduced, the transmission stability of lightning current is ensured, and the reliability of the lightning protection system is improved. In addition, the first disc and the second disc can apply uniform clamping force to prevent the lightning protection layer from loosening or displacing, ensuring stable connection. Even if the blade vibrates or expands due to heat, good electrical connection can be maintained. In addition, the structure of the first disc and the second disc clamping the lightning protection layer is simple and easy to install, which improves the installation efficiency and reduces the installation cost.

[0007] In addition, by tilting at least the peripheral region of the first mating surface towards the direction away from the second disc, when the lightning protection layer clamped by the first disc and the second disc is laid on the inner wall surface of the mold, the distance between the edge of the first mating surface and the inner wall surface of the mold can be reduced. In this way, the lightning protection layer passing through the two first discs and the second disc can be smoothly attached to the inner wall surface of the mold by using the inclined peripheral region, reducing the possibility of damage caused by sharp bending of the lightning protection layer, reducing the shear force suffered by the lightning protection layer, preventing fatigue failure, and ensuring the effectiveness of lightning protection.

[0008] According to another aspect of the present disclosure, a wind turbine generator set is provided, comprising a tower, a nacelle, a hub and a plurality of wind turbine blades as described above, wherein the nacelle is mounted at the top end of the tower, and the nacelle is connected with the wind turbine blades through the hub.

[0009] According to still another aspect of the present disclosure, a connecting disc component is provided, comprising a first disc and a second disc, wherein the first disc and the second disc are both provided with a through hole, the first disc is provided with a first mating surface, the second disc is provided with a second mating surface matched with the first mating surface, and at least the peripheral region of the first mating surface and the second mating surface is tilted towards the direction away from the second disc; when the first disc and the second disc are connected, the first mating surface and the second mating surface are used to clamp the lightning protection layer. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0011] Figure 1 A structural schematic diagram of a wind turbine generator set is shown according to one embodiment of the present disclosure;

[0012] Figure 2 A structural schematic diagram of a wind power blade is shown according to one embodiment of the present disclosure;

[0013] Figure 3 A half-section schematic diagram of a wind power blade along a chord direction is shown according to one embodiment of the present disclosure;

[0014] Figure 4 A partial structural schematic diagram of a wind power blade arranged along a span direction is shown according to one embodiment of the present disclosure;

[0015] Figure 5 A cross-sectional schematic diagram of a wind power blade at a first connecting assembly is shown according to one embodiment of the present disclosure;

[0016] Figure 6 A three-dimensional schematic diagram of a second disc piece is shown according to one embodiment of the present disclosure;

[0017] Figure 7 A three-dimensional schematic diagram of a first disc piece is shown according to one embodiment of the present disclosure;

[0018] Figure 8 A connecting schematic diagram of a connecting assembly and a lightning protection layer is shown according to one embodiment of the present disclosure.

[0019] Explanation of reference signs:

[0020] 1000, wind power blade; 2000, tower barrel; 3000, nacelle; 4000, hub;

[0021] 100, blade body; 101, first region; 102, second region; 103, third region; 110, blade root; 120, blade tip; 130, pressure side; 140, suction side; 150, cavity;

[0022] 200, structural element; 210, first carbon beam; 220, second carbon beam;

[0023] 300, lightning protection layer; 310, first lightning protection layer; 320, second lightning protection layer;

[0024] 400, blade tip lightning arrester;

[0025] 500, electrically conductive device; 510, first connecting member; 520, second connecting member; 530, third connecting member; 540, fourth connecting member;

[0026] 600, connecting assembly; 610, first connecting assembly; 611, connecting disc member; 6111, through hole; 6112, first disc part; 6113, second disc part; 6114, connecting hole; 6115, first mating surface; 6116, second mating surface; 6117, peripheral region; 6118, intermediate region; 6119, second fastener; 612, first fastener; 620, second connecting assembly; 630, third connecting assembly; 640, fourth connecting assembly; 650, fifth connecting assembly;

[0027] 710, first down conductor; 720, second down conductor; 730, third down conductor;

[0028] 800, blade lightning receptor. DETAILED DESCRIPTION

[0029] Blades, as the highest installed components in wind turbine generators, are the primary targets of lightning attacks, so lightning protection systems are usually arranged on the blades to reduce damage to the blades caused by lightning. In the related art, a metal mesh is arranged on the surface of a wind power blade, and the metal mesh is connected to an electrically conductive device such as a down conductor or a main beam inside the blade through a bolt and a metal disc to play a lightning protection role. However, the electrical connection reliability of the metal mesh and the metal disc is poor, which affects the effectiveness of the lightning protection effect. For example, during installation, the connection process of the metal disc and the metal mesh is improper, which causes the metal disc to not fit the metal disc, resulting in unreliable connection, and / or, the long-term mechanical vibration of the blade causes the connection at the connection position of the metal mesh and the metal disc to loosen or be damaged, reducing the electrical connection reliability.

[0030] Therefore, the present disclosure attempts to increase the contact area by using two metal discs to clamp the metal mesh and connect the metal mesh, thereby effectively reducing the contact resistance, ensuring stable lightning current transmission, and improving the reliability of the lightning protection system. In addition, the two metal discs apply uniform clamping force to prevent the metal mesh from loosening or displacing, ensuring stable connection, even if the blade vibrates or expands due to heat, the electrical connection can still be maintained. The structure of the two metal discs clamping the metal mesh is simple, easy to install, improves installation efficiency, and reduces installation cost.

[0031] At the same time, considering that the metal mesh, clamped by two metal discs, is integrated with the blade body through the infusion process, it is necessary to first lay the metal mesh clamped by the two metal discs on the inner wall surface of the mold, and then lay the core material such as fiberglass cloth that forms the blade body on top of the metal mesh. As well as the pressure operation during the infusion process, the metal mesh will be pressed tightly against the inner wall surface of the mold. However, because the metal mesh is clamped between the two metal discs and the metal disc close to the inner wall surface of the mold has a certain thickness, this also results in a certain shear force on the metal mesh at the edge of the metal disc close to the inner wall surface of the mold. This shear force can easily cause fatigue failure of the metal mesh.

[0032] Therefore, the present invention further tilts at least the outer area of ​​the side of the metal plate close to the inner wall of the mold away from the inner wall of the mold toward the inner wall of the mold. In this way, the metal mesh passing through the two metal plates can utilize the tilted outer area to smoothly fit toward the inner wall of the mold, thereby reducing the shear force on the metal mesh, preventing fatigue from taking effect, and ensuring the effectiveness of lightning protection.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments.

[0034] like Figure 1 As shown, the present disclosure provides a wind turbine generator set, which is a device that converts wind energy into electrical energy. Its function is to efficiently convert natural wind energy into usable electrical energy and transmit it to the power grid. The wind turbine generator set may include a plurality of wind turbine blades 1000, a tower 2000, a nacelle 3000, and a hub 4000. The nacelle 3000 is mounted at the top of the tower 2000. A generator, a gearbox, and a main shaft may be installed in the nacelle 3000. The hub 4000 is located at one end of the nacelle 3000 and is connected to the generator via the main shaft and gearbox. The wind turbine blades 1000 are mounted on the hub 4000. In this way, when the wind turbine blades 1000 capture wind energy, they drive the hub 4000 to rotate, and the energy is transmitted to the generator via the main shaft and gearbox, thereby converting the wind energy into mechanical energy. The wind turbine generator then converts the mechanical energy into electrical energy. For example, the number of wind turbine blades 1000 can be three.

[0035] In order to reduce the possibility of the wind turbine blade 1000 being damaged by lightning, the wind turbine blade 1000 may be integrated with a lightning protection system to reduce the lightning damage to the wind turbine blade 1000 by using the lightning protection system. Figures 2 to 4As shown, the wind turbine blade 1000 can include a blade body 100, a lightning protection layer 300, a connecting assembly 600, and a lightning tip 400. The blade body 100 serves as a main load-bearing component, and is mainly used to support and protect other components of the wind turbine blade 1000. The blade body 100 has a root 110, a tip 120, a pressure side 130, and a suction side 140. The root 110 and the tip 120 are located at opposite ends of the blade body 100 in the spanwise direction. The pressure side 130 and the suction side 140 are outer surfaces of the blade body 100. The blade body 100 encloses a cavity 150. The blade body 100 can be a blade shell structure formed by resin infusion of a laid-up glass fiber cloth, a foam core material, balsa wood, and / or other reinforcing materials, etc. The blade body 100 is a hollow structure, and the blade body 100 is provided with an electrically conductive device 500, which can be at least partially located in the cavity 150 or embedded in the blade body 100. The electrically conductive device 500 can be at least one of a structural element 200, a down conductor, or a connecting piece (e.g., at least one of the first connecting piece 510, the second connecting piece 520, the third connecting piece 530, and the fourth connecting piece 540 described below) electrically connected to the two. The down conductor can be at least one of the first down conductor 710, the second down conductor 720, and the third down conductor 730 described below. The structural element 200 is a main reinforcing structure of the wind turbine blade 1000, which is used to enhance the overall strength and stiffness of the blade. It can be laid up in the mold together with the core material of the blade body 100, and formed integrally with the blade body 100 by resin infusion.

[0036] The lightning protection layer 300 is arranged on the blade body 100 and adjacent to the outer surface of the blade body 100. The connecting assembly 600 is used to electrically connect the lightning protection layer 300 and the electrically conductive device 500. The connecting assembly 600 can be any one of the first connecting assembly 610, the second connecting assembly 620, the third connecting assembly 630, the fourth connecting assembly 640, and the fifth connecting assembly 650 described below.

[0037] In some embodiments, the lightning protection layer 300 can include a first lightning protection layer 310 and a second lightning protection layer 320. The first lightning protection layer 310 is located between the pressure side 130 and the structural element 200, and the second lightning protection layer 320 is located between the suction side 140 and the structural element 200. That is, the first lightning protection layer 310 and the second lightning protection layer 320 are laid up on the outer surface of the blade body 100, thereby forming a Faraday cage on the surface of the blade body 100 by the first lightning protection layer 310 and the second lightning protection layer 320. This shields external electric fields and electromagnetic pulses, prevents direct action of external lightning fields on internal structures, and avoids lightning-induced partial discharge or arc discharge inside the blade body 100, thereby protecting the mechanical and electrical properties of the wind turbine blade 1000.

[0038] Exemplarily, the first lightning protection layer 310 and / or the second lightning protection layer 320 can be made of a metal mesh or an expanded foil, which is not specifically limited herein. The first lightning protection layer 310 and the second lightning protection layer 320 can be integrally formed with the blade body 100, for example, the first lightning protection layer 310 and the second lightning protection layer 320 can be respectively laid on the inner wall surfaces of two half-blade molds in advance, then the core material for forming the blade body 100 is laid on the first lightning protection layer 310 and the second lightning protection layer 320, and finally the first lightning protection layer 310 and the second lightning protection layer 320 are integrally formed with the blade body 100 by resin infusion. In actual application, the outer surface of the first lightning protection layer 310 and the second lightning protection layer 320 can be coated with a paint layer, so as to isolate the first lightning protection layer 310 and the second lightning protection layer 320 from the external environment, prevent the first lightning protection layer 310 and the second lightning protection layer 320 from being corroded by corrosive factors such as moisture, salt mist and chemicals, and prolong the service life of the first lightning protection layer 310 and the second lightning protection layer 320. Correspondingly, the side of the paint layer away from the first lightning protection layer 310 is the aforementioned pressure side 130, and the side of the paint layer away from the second lightning protection layer 320 is the aforementioned suction side 140.

[0039] The tip lightning arrester 400 is arranged on the tip 120, so that the tip lightning arrester 400, as a protruding conductive component at the highest point of the wind turbine blade 1000, attracts lightning as the preferred hit point, thereby protecting other parts of the wind turbine blade 1000.

[0040] The tip lightning arrester 400 can be grounded through the first lightning protection layer 310 and the second lightning protection layer 320, and when the tip lightning arrester 400, the first lightning protection layer 310 or the second lightning protection layer 320 is struck by lightning, the lightning current can be quickly guided to the ground, thereby reducing the loss of the wind turbine blade 1000. Specifically, in some embodiments, two first connecting components 510 are arranged on the inner wall surface of the cavity 150, the first lightning protection layer 310 is connected to one of the first connecting components 510 through a first connecting assembly 610, the second lightning protection layer 320 is electrically connected to the other first connecting component 510 through a second connecting assembly 620, the two first connecting components 510 are respectively electrically connected to the first down conductor 710 through two second down conductors 720, and the first down conductor 710 is electrically connected to the tip lightning arrester 400. In this way, when the tip lightning arrester 400 is struck by lightning, the lightning current can flow to the first lightning protection layer 310 and the second lightning protection layer 320 through the tip lightning arrester 400, the first down conductor 710 and the two second down conductors 720 in sequence, and then be grounded, so that the lightning current can be uniformly dispersed in multiple directions by the first lightning protection layer 310 and the second lightning protection layer 320, thereby preventing the lightning current from being too concentrated to cause serious thermal effect and mechanical effect on a certain part of the wind turbine blade 1000, and reducing the local damage of the wind turbine blade 1000 caused by lightning strike.

[0041] Meanwhile, it can be understood that, compared with the mode that the first lightning protection layer 310 and the second lightning protection layer 320 are respectively electrically connected with the same connecting block through the connecting assemblies, and the connecting block is electrically connected with the first down conductor 710, the mode of the present disclosure needs the mutual alignment of two connecting assemblies and a connecting block. The present disclosure connects the first lightning protection layer 310 and the second lightning protection layer 320 with two first connecting pieces 510 through the first connecting assembly 610 and the second connecting assembly 620 respectively, and connects the two first connecting pieces 510 with the first down conductor 710 through two second down conductors 720. The first connecting assembly 610 only needs to be aligned with one of the first connecting pieces 510, and the second connecting assembly 620 only needs to be aligned with the other first connecting piece 510. That is, the mode of the present disclosure only needs the mutual alignment of two components, compared with the mode of the alignment of three components, which can simplify the production process and reduce the production difficulty, so that the present disclosure can reduce the possibility of being damaged by lightning while reducing the production difficulty.

[0042] In addition, the mode that the first down conductor 710 is electrically connected with the two first connecting pieces 510 through the two second down conductors 720, when one of the second down conductors 720 fails, the other second down conductor 720 can still continue to ground the lightning current suffered by the blade tip, which plays a certain redundant role and enhances the reliability of lightning protection.

[0043] In actual production process, the blade tip lightning arrester 400, the first down conductor 710, the two second down conductors 720 and the two first connecting pieces 510 can be connected in advance, then the two first connecting pieces 510 are respectively bonded in the position aligned with the corresponding connecting assembly on the two half-blades which are not closed, and the blade tip lightning arrester 400 is installed at the tip of one of the half-blades.

[0044] For example, the first connecting piece 510 for electrically connecting with the first lightning protection layer 310 can be arranged close to the first lightning protection layer 310, and the first connecting piece 510 for electrically connecting with the second lightning protection layer 320 can be arranged close to the second lightning protection layer 320, so as to simplify the structure of the corresponding connecting assembly and facilitate the connection operation. The first connecting piece 510 can be a conductive connecting sheet or a conductive connecting block. The first down conductor 710 and the second down conductor 720 can be cables or other conductive linear components.

[0045] In some embodiments, as shown in Figure 4 The first lightning protection layer 310 and the second lightning protection layer 320 are respectively connected with the third down conductor 730 through the fifth connecting assembly 650 and the fourth connecting piece 540 in sequence at one end adjacent to the blade root 110, the fifth connecting assembly 650 can pass through the corresponding lightning protection layer and extend to the inside of the blade body 100 to contact the corresponding connecting piece to realize electrical connection, so as to be grounded through the third down conductor 730 located in the cavity 150, thereby reducing the exposure of the third down conductor 730 to the outside and the erosion damage, and ensuring the reliability of the lightning protection system.

[0046] The fourth connecting pieces 540, the fifth connecting assemblies 650, and the third down conductors 730 are all two in number. The two fourth connecting pieces 540 are arranged on the inner wall surface of the cavity 150 and are respectively close to the corresponding fifth connecting assemblies 650. The first lightning protection layer 310 is connected with one of the fourth connecting pieces 540 through one of the fifth connecting assemblies 650, and the second lightning protection layer 320 is connected with the other fourth connecting piece 540 through the other fifth connecting assembly 650. The two fourth connecting pieces 540 are respectively grounded through the two third down conductors 730. In this way, on the one hand, the first lightning protection layer 310 and the second lightning protection layer 320 are respectively connected with the two fourth connecting pieces 540 through the two fifth connecting assemblies 650. Each fifth connecting assembly 650 only needs to be aligned with one fourth connecting piece 540, that is, the method of the present disclosure only needs two components to be aligned with each other. Compared with the method of aligning three components, the production process can be simplified, and the production difficulty can be reduced, so that the present disclosure can reduce the possibility of being damaged by lightning while reducing the production difficulty. On the other hand, each lightning protection layer is respectively grounded through a separate connecting assembly, connecting piece, and down conductor. Redundant grounding connection paths can be provided. Even if one of the paths fails, it can still play a certain role in lightning protection to some extent, and the reliability of lightning protection is enhanced.

[0047] The structural element 200 described above can be made of glass fiber.

[0048] The structural element 200 described above can also be made of carbon fiber, which has better strength, stiffness, and fatigue resistance, and is lighter.

[0049] It is considered that when the structural element 200 is made of carbon fiber, the carbon fiber main beam has good electrical conductivity, which will further increase the risk of wind power blades being struck by lightning. Therefore, in some embodiments, the structural element 200 can include a first carbon beam 210 and a second carbon beam 220. The first lightning protection layer 310 at least covers the first carbon beam 210, and the second lightning protection layer 320 at least covers the second carbon beam 220, so that the first carbon beam 210 and the second carbon beam 220 are prevented from being directly affected by external lightning by the first lightning protection layer 310 and the second lightning protection layer 320, and damage to the first carbon beam 210 and the second carbon beam 220 is prevented.

[0050] For example, the two chord-wise ends of the first lightning protection layer 310 can be flush with or extend beyond the two chord-wise ends of the first carbon beam 210, and the two span-wise ends of the second lightning protection layer 320 can be flush with or extend beyond the two span-wise ends of the first carbon beam 210. For example, the two chord-wise ends of the first lightning protection layer 310 each extend at least 150 mm beyond the two chord-wise ends of the first carbon beam 210, and the two span-wise ends of the first lightning protection layer 310 each extend at least 150 mm beyond the two span-wise ends of the first carbon beam 210, so as to improve the protection of the first carbon beam 210 by the first lightning protection layer 310. The arrangement of the second lightning protection layer 320 relative to the second carbon beam 220 can refer to the arrangement of the first lightning protection layer 310 relative to the first carbon beam 210, which will not be described herein again.

[0051] In order to facilitate the manufacture of the blade body 100 and the installation of the internal structure, in some embodiments, the blade body 100 can adopt a split design. Specifically, the blade body 100 includes a first half blade and a second half blade, where the first half blade can be a PS surface shell, and the second half blade can be a SS surface shell. The first carbon beam 210, the first lightning protection layer 310, one of the first connecting members 510, and the first connecting assembly 610 are arranged on the first half blade, and the second carbon beam 220, the second lightning protection layer 320, the other first connecting member 510, and the second connecting assembly 620 are arranged on the second half blade. In this way, the one of the first connecting members 510 and the first connecting assembly 610 that need to be aligned with each other are located on the same half blade, which facilitates the alignment operation, ensures the connection accuracy of the one of the first connecting members 510 and the first connecting assembly 610, and avoids disconnection that affects the lightning protection effect.

[0052] In some embodiments, as shown in FIGS. 1A and 1B, the blade body 100 includes a first lightning protection layer 310 and a second lightning protection layer 320. The first lightning protection layer 310 is arranged on the first carbon beam 210, and the second lightning protection layer 320 is arranged on the second carbon beam 220. The first lightning protection layer 310 and the second lightning protection layer 320 are arranged on the first carbon beam 210 and the second carbon beam 220, respectively, so as to form a Faraday cage around the first carbon beam 210 and the second carbon beam 220, thereby improving the lightning protection effect of the wind turbine blade 1000. Figure 2 and Figure 4 As shown in FIGS. 1A and 1B, the blade body 100 is divided into a first region 101, a second region 102, and a third region 103 located between the first region 101 and the second region 102 along the span direction. The third region 103 extends along the span direction from one end of the structural element 200 to the other end of the structural element 200. The first region 101 is located at one end of the third region 103 adjacent to the root 110, and the second region 102 is located at one end of the third region 103 adjacent to the tip 120. Alternatively, the blade body 100 is divided into the third region 103 containing the structural element 200 and other regions not containing the structural element 200 along the span direction according to whether the structural element 200 is contained. The other regions include the first region 101 close to the root 110 and the second region 102 close to the tip 120. The first lightning protection layer 310 and / or the second lightning protection layer 320 extend to the first region 101 and / or the second region 102, thereby improving the shielding range of the Faraday cage formed by the first lightning protection layer 310 and / or the second lightning protection layer 320, and further improving the lightning protection effect of the wind turbine blade 1000.

[0053] When the first lightning protection layer 310 and the second lightning protection layer 320 are metal meshes, the density of the metal meshes can be uniformly distributed as a whole. Of course, the density of the metal meshes can also be gradually distributed or segmented as a whole.

[0054] In some embodiments, the density of the metal mesh in the second region 102 is greater than the density of the metal mesh in the first region 101 and the density of the metal mesh in the third region 103. This high-density metal mesh can more effectively guide and disperse lightning current, reducing the risk of damage to the blade from lightning strikes, thereby providing stronger lightning protection for the second region 102, which is more susceptible to lightning strikes. Furthermore, because lightning current is more likely to concentrate in the second region 102, the high-density metal mesh can provide a smoother and more efficient conduction path for the lightning current, reducing the dispersion of lightning current in the wind turbine blade 1000 and erosion of the wind turbine blade 1000 material.

[0055] Exemplarily, the material of the metal mesh can be any one of copper, aluminum, copper alloy, aluminum alloy, iron, iron alloy, tin alloy and stainless steel; the metal mesh can be formed by cutting and stretching metal foil, and the mesh of the metal mesh can be at least one of diamond, square, rectangle and triangle.

[0056] Considering that when the wind turbine blade 1000 is struck by lightning, the potential of the first lightning protection layer 310 and the second lightning protection layer 320 is extremely high relative to the ground, while the structural element 200 is at a suspension potential, i.e., 0 potential, there is a potential difference between the first lightning protection layer 310 and the second lightning protection layer 320 and the structural element 200, which may cause arc discharge and damage the structure of the structural element 200.

[0057] To this end, in some embodiments, the structural element 200 is connected to the first lightning protection layer 310 and the second lightning protection layer 320 at the same potential, so that the potential of the structural element 200 is consistent with that of the first lightning protection layer 310 and the second lightning protection layer 320, ensuring that the lightning current can be safely conducted to the ground and preventing arc discharge from causing damage to the structural element 200.

[0058] like Figure 4As shown, taking the example that the structural element 200 includes the first carbon beam 210 and the second carbon beam 220, the first carbon beam 210 is arranged adjacent to the first lightning protection layer 310, and the first carbon beam 210 is electrically connected with at least two second connecting pieces 520, the at least two second connecting pieces 520 are arranged along the spanwise direction, and the first lightning protection layer 310 is electrically connected with the second connecting pieces 520 through the third connecting assemblies 630 respectively, that is, the number of the third connecting assemblies 630 is the same as that of the second connecting pieces 520, and the third connecting assemblies 630 are electrically connected with the second connecting pieces 520 one by one. Similarly, the second carbon beam 220 is arranged adjacent to the second lightning protection layer 320, and the second carbon beam 220 is electrically connected with at least two third connecting pieces 530, the at least two third connecting pieces 530 are arranged along the spanwise direction, and the second lightning protection layer 320 is electrically connected with the third connecting pieces 530 through the fourth connecting assemblies 640 respectively, that is, the number of the fourth connecting assemblies 640 is the same as that of the third connecting pieces 530, and the fourth connecting assemblies 640 are electrically connected with the third connecting pieces 530 one by one. In this way, each carbon beam is electrically connected with the lightning protection layer adjacent thereto, the connection operation is simplified, and the connecting assemblies do not need to be connected to the carbon beam, so that damage to the structure of the carbon beam is avoided, and the reliability of the overall structure of the wind power blade 1000 is improved.

[0059] For example, the second connecting pieces 520 and the third connecting assemblies 630 are two respectively, the second connecting pieces 520 are located at the two ends of the first carbon beam 210 along the spanwise direction, and the two third connecting assemblies 630 are electrically connected with the two second connecting pieces 520 respectively. The third connecting pieces 530 and the fourth connecting assemblies 640 are two respectively, the third connecting pieces 530 are located at the two ends of the second carbon beam 220 along the spanwise direction, and the two fourth connecting assemblies 640 are electrically connected with the two third connecting pieces 530 respectively.

[0060] In some embodiments, the first carbon beam 210 and the second connecting pieces 520 are formed into one body through a pouring process, and / or the second carbon beam 220 and the third connecting pieces 530 are formed into one body through a pouring process. In this way, the risk of structural damage caused by weak connection between components can be effectively reduced, and the overall strength and rigidity of the blade are improved. At the same time, the number of parts and the assembly process are reduced, the production process of the wind power blade 1000 is simplified, and the manufacturing time is shortened.

[0061] For example, the first carbon beam 210, the second connecting pieces 520 and the blade body 100 are formed into one body through a pouring process. Of course, the first carbon beam 210 and the second connecting pieces 520 can be first formed into one body through a pouring process, and then integrally laid into the core material to form the blade body 100 again to be formed into one body with the blade body 100 through a pouring process. The forming mode of the second carbon beam 220 and the third connecting pieces 530 can refer to the mode of the first carbon beam 210 and the second connecting pieces 520, which will not be described here.

[0062] The first connecting assembly 610, the second connecting assembly 620, the third connecting assembly 630, the fourth connecting assembly 640, and the fifth connecting assembly 650 can have the same structure, partially the same structure, or different structures.

[0063] With reference to the specific structure of the connecting assembly 600, the connecting assembly 600 is taken as the first connecting assembly 610, the conductive device 500 is taken as the first connecting piece 510, and the lightning protection layer 300 is taken as the first lightning protection layer 310. In some embodiments, as shown in FIG. 6A, the first connecting assembly 610 can include a connecting disc part 611 and a first fastener 612. The connecting disc part 611 is electrically connected to the first lightning protection layer 310, and the connecting disc part 611 is provided with a through hole 6111. One end of the first fastener 612 passes through the through hole 6111, the first lightning protection layer 310, and the blade body 100 to contact the first connecting piece 510, and the other end of the first fastener 612 abuts against the connecting disc part 611, so that the first lightning protection layer 310 is electrically connected to the first connecting piece 510 through the first connecting assembly 610. Figures 5 to 7

[0064] In actual production, the connecting disc part 611 can be clamped on the first lightning protection layer 310 to be electrically connected to the first lightning protection layer 310, and be laid on the inner wall surface of the half-blade mold together with the first lightning protection layer 310. Then, the core material for forming the half-blade of the blade body 100 is laid on the first lightning protection layer 310, and finally, the connecting disc part 611 is integrated with the blade body 100 by resin pouring, so that the connecting disc part 611 does not need to be additionally attached to the first lightning protection layer 310, the process is simplified, and the electrical connection reliability of the connecting disc part 611 and the first lightning protection layer 310 is ensured. For example, the first fastener 612 can be a bolt. After the connecting disc part 611, the first lightning protection layer 310, and the half-blade of the blade body 100 are integrally poured, the surface of the connecting disc part 611 can be polished, and the bolt can be drilled into the through hole 6111, so that the first connecting piece 510 is electrically connected to the connecting disc part 611 through the bolt.

[0065] The connecting disc part 611 can include only one disc part that is electrically connected to the first lightning protection layer 310.

[0066] ​To further improve the electrical connection reliability of the connecting disc part 611 and the first lightning protection layer 310, in some embodiments, the connecting disc part 611 can include a first disc piece 6112 and a second disc piece 6113, wherein the second disc piece 6113 is located between the first disc piece 6112 and the first connecting piece 510, the through hole 6111 penetrates through the first disc piece 6112 and the second disc piece 6113, or in other words, the first disc piece 6112 and the second disc piece 6113 are both provided with the through hole 6111, and the first disc piece 6112 and the second disc piece 6113 are connected and clamp the first lightning protection layer 310 between them, so as to compact the first lightning protection layer 310 by the clamping force of the connection of the first disc piece 6112 and the second disc piece 6113, improve the contact area of the first lightning protection layer 310 and the connecting disc part 611, effectively reduce the contact resistance, and ensure stable lightning current transmission and improve the reliability of the lightning protection system. In addition, the first disc piece 6112 and the second disc piece 6113 can exert uniform clamping force to prevent the lightning protection layer 300 from loosening or displacing, ensure stable connection, and maintain good electrical connection even if the blade vibrates or expands due to heat.

[0067] For example, the first disc piece 6112 is made of conductive material, or both the first disc piece 6112 and the second disc piece 6113 are made of conductive material.

[0068] At the same time, considering that during the process of forming the lightning protection layer 300 clamped by the first disc piece 6112 and the second disc piece 6113 into the blade body 100 through the pouring process, the lightning protection layer 300 clamped by the first disc piece 6112 and the second disc piece 6113 needs to be laid on the inner wall surface of the mold first, and then the core material such as glass cloth forming the blade body 100 is laid on the lightning protection layer 300, and the pressure operation during the pouring process, all of which will make the lightning protection layer 300 tightly adhere to the inner wall surface of the mold. However, since the lightning protection layer 300 is clamped between the first disc piece 6112 and the second disc piece 6113, and there is a certain thickness near the first disc piece 6112, it will cause a certain shearing force on the lightning protection layer 300 from the edge of the first disc piece 6112, which is easy to cause fatigue failure of the lightning protection layer 300.

[0069] Therefore, in some embodiments, as shown in FIG. 6B, the first disc piece 6112 is provided with a plurality of through holes 6114, and the second disc piece 6113 is provided with a plurality of through holes 6115. Figure 5 and Figure 7As shown, one side of the first disc member 6112 adjacent to the second disc member 6113 is defined as the first matching surface 6115, and at least the peripheral area 6117 of the first matching surface 6115 is arranged to be inclined towards the direction away from the second disc member 6113. In this way, when the lightning protection layer 300 to be clamped by the first disc member 6112 and the second disc member 6113 is laid on the inner wall surface of the mold, the distance between the edge of the first matching surface 6115 and the inner wall surface of the mold can be reduced. In this way, the lightning protection layer 300 passing through the two first disc members 6112 and the second disc member 6113 can be gently attached to the inner wall surface of the mold by using the inclined peripheral area 6117, which reduces the possibility of abrupt bending damage of the lightning protection layer 300, reduces the shear force suffered by the lightning protection layer 300, prevents fatigue failure, and ensures the effectiveness of lightning protection.

[0070] For example, the peripheral area 6117 of the first matching surface 6115 is connected to the side of the first disc member 6112 away from the second disc member 6113, so that the distance between the edge of the first matching surface 6115 and the side of the first disc member 6112 away from the second disc member 6113 is zero, further reducing the shear force suffered by the lightning protection layer 300. Of course, there can also be a certain distance between the edge of the first matching surface 6115 and the side of the first disc member 6112 away from the second disc member 6113, but the smaller the distance is, the better.

[0071] Further, as shown in Figure 5 and Figure 6 The second disc member 6113 has a second matching surface 6116 matched with the first matching surface 6115, or the shapes of the first matching surface 6115 and the second matching surface 6116 are matched in concave-convex, and the first disc member 6112 and the second disc member 6113 clamp the lightning protection layer 300 through the first matching surface 6115 and the second matching surface 6116. In this way, when at least the peripheral area 6117 of the first matching surface 6115 is arranged to be inclined towards the direction away from the second disc member 6113, the second matching surface 6116 can still match the first matching surface 6115 to tightly clamp the lightning protection layer 300, so as to ensure the contact area.

[0072] Regarding the specific forms of the first matching surface 6115 and the second matching surface 6116, the present disclosure provides two implementable embodiments for reference.

[0073] Embodiment one, the first matching surface 6115 and the second matching surface 6116 are configured as curved surfaces and are raised towards the conductive device 500. For example, the first matching surface 6115 and the second matching surface 6116 are arranged to be inclined away from the conductive device 500 from the center to the edge direction.

[0074] Embodiment two, as shown in Figure 6 and Figure 7As shown, the first mating surface 6115 and the second mating surface 6116 each include a peripheral region 6117 and a middle region 6118 located within the peripheral region 6117. The peripheral region 6117 is inclined from the middle region 6118 in a direction away from the conductive device 500, and the middle region 6118 is perpendicular to the axis of the first fastener 612. Thus, the middle region 6118 and the peripheral region 6117 can be formed by chamfering or rounding the edges of the first plate 6112 and the second plate 6113, respectively, thereby simplifying the production process, improving production efficiency, and reducing production costs.

[0075] In this embodiment, the peripheral area 6117 may be constructed as an inclined surface or a curved surface, or in other words, when viewed from a cross section coinciding with the axis of the peripheral area 6117 , the line displayed on the cross section of the peripheral area 6117 is an inclined line or a curve.

[0076] Exemplarily, the through hole 6111 may be located on the middle region 6118 . In this way, drilling on a plane can simplify the drilling difficulty and reduce production costs.

[0077] In some embodiments, a conductive material may be provided between the first plate 6112 and the second plate 6113, so that the conductive material can be used to increase the contact area and contact stability between the connecting plate component 611 and the lightning protection layer 300, effectively reduce the contact resistance, ensure the stable transmission of lightning current, and improve the reliability of the lightning protection system.

[0078] The conductive material may be configured as metal powder or hot-melt metal. The conductive material is disposed in the mesh of the lightning protection layer 300 between the first plate 6112 and the second plate 6113, and / or between the first plate 6112 and the lightning protection layer 300, and / or between the second plate 6113 and the lightning protection layer 300.

[0079] The conductive material may also be a layered structure such as conductive foam or metal foil, and the conductive material is disposed between the first plate 6112 and the lightning protection layer 300 , and / or between the second plate 6113 and the lightning protection layer 300 .

[0080] In some embodiments, as Figure 8 As shown, the lightning protection layer 300 is a metal mesh, and the density of the metal mesh can decrease outward from the connecting assembly 600. This ensures that the conductivity of the metal mesh at the connecting assembly 600 is close to that of the connecting assembly 600, which is more conducive to current conduction. At the same time, it can reduce the potential difference and prevent potential corrosion caused by arc discharge. It should be noted that this does not mean that the metal mesh density of the entire lightning protection layer 300 decreases outward from the connecting assembly 600, but rather that the metal mesh density in a predetermined area near the connecting assembly 600 decreases outward from the connecting assembly 600.

[0081] Further, the thickness of the metal mesh should be no less than 0.2mm, and / or the metal mesh is made of the same material as the connecting disc component 611, so as to further ensure that the metal mesh at the connecting assembly 600 is close to the conductivity of the connecting assembly 600, is more conducive to current conduction, and reduces the generation of potential difference to prevent the generation of potential corrosion caused by arc discharge.

[0082] In some embodiments, the first disc member 6112 and the second disc member 6113 can be connected to each other by welding or bonding.

[0083] In some other embodiments, as shown in Figures 5 to 7 the first disc member 6112 and the second disc member 6113 can be connected by the second fastener 6119.

[0084] For example, the second fastener 6119 can have a plurality of second fasteners 6119 which can be arranged in a ring around the axis of the first fastener 612. The second fastener 6119 can be a rivet or a bolt, and the first disc member 6112 and the second disc member 6113 can be provided with a plurality of corresponding connecting holes 6114 in advance, so as to connect the first disc member 6112 and the second disc member 6113 through the corresponding connecting holes 6114, wherein the connecting holes 6114 can be located on the intermediate region 6118 or the peripheral region 6117. Moreover, the second fastener 6119 connecting the first disc member 6112 and the second disc member 6113 can also serve as the lightning protection layer 300 and the electrical connection of the connecting disc component 611, further improving the electrical connection reliability of the lightning protection layer 300 and the connecting disc component 611.

[0085] In some embodiments, as shown in Figure 4 the wind power blade 1000 further comprises a blade body lightning arrester 800, wherein the blade body lightning arrester 800 is electrically connected to the first down conductor 710, and the blade body lightning arrester 800 is located between the blade tip lightning arrester 400 and the first connecting member 510 along the spanwise direction. Alternatively, the present disclosure also provides the blade body lightning arrester 800 in the second region 102 which is vulnerable to lightning, so as to cover a wider area of the wind power blade 1000 by using the blade body lightning arrester, increase the probability of lightning arrest, and ensure that even if the lightning strikes the region other than the blade tip lightning arrester 400, it can also be guided and conducted in time, thereby providing more comprehensive lightning protection. At the same time, the blade body lightning arrester 800 can also be regarded as a redundant backup of the blade tip lightning arrester 400. If the blade tip lightning arrester 400 fails to effectively arrest lightning for some reason, the blade body lightning arrester 800 can play a supplementary role to ensure the reliability of the entire blade lightning protection system.

[0086] For example, the blade body lightning arrester 800 can include a connecting base and a lightning arrester, the connecting base can be bonded to the blade body 100, and then the lightning arrester can be connected to the connecting base.

[0087] Based on the same inventive concept, the disclosure also provides a connecting disc part 611, which comprises a first disc piece 6112 and a second disc piece 6113, wherein the first disc piece 6112 and the second disc piece 6113 are both provided with a through hole 6111, the first disc piece 6112 is provided with a first matching surface 6115, the second disc piece 6113 is provided with a second matching surface 6116 matched with the first matching surface 6115, and the first matching surface 6115 and the second matching surface 6116 are both inclinedly arranged in a direction away from the second disc piece 6113 at least in a peripheral area 6117; and the first matching surface 6115 and the second matching surface 6116 are used for clamping the lightning protection layer 300 when the first disc piece 6112 and the second disc piece 6113 are connected.

[0088] It should be noted that the specific structure of the first disc piece 6112 and the second disc piece 6113 is described in the above embodiment, and will not be described here.

[0089] In the disclosure, the terms "upper", "lower", and the like are used to describe the relative position relationship of various structures in the drawings, and are only for the convenience of clear description, and do not limit the scope of the disclosure. The change or adjustment of the relative relationship is also considered as the scope of the disclosure without substantially changing the technical content.

[0090] It should be noted that: in the disclosure, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0091] In addition, in the disclosure, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the disclosure can be understood according to the specific circumstances.

[0092] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present disclosure. In the present description, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0093] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A wind turbine blade, characterized in that: The invention comprises a blade body (100), a lightning protection layer (300) and a connection assembly (600), wherein the blade body (100) is provided with a conductive device (500); the lightning protection layer (300) is provided on the blade body (100) and is arranged adjacent to the outer surface of the blade body (100); the connection assembly (600) comprises a connection plate component (611) and a first fastener (612), wherein: The connecting plate component (611) includes a first plate member (6112) and a second plate member (6113), the second plate member (6113) is located between the first plate member (6112) and the conductive device (500), the first plate member (6112) and the second plate member (6113) are connected and clamp the lightning protection layer (300) between the first plate member (6112) and the second plate member (6113), a surface of the first plate member (6112) adjacent to the second plate member (6113) is a first mating surface (6115), and at least a peripheral area (6117) of the first mating surface (6115) is tilted in a direction away from the second plate member (6113); One end of the first fastener (612) passes through the first disc (6112), the second disc (6113) and the blade body (100) to be electrically connected to the conductive device (500), and the other end of the first fastener (612) abuts against the first disc (6112).

2. The wind turbine blade according to claim 1, characterized in that: The second disc (6113) has a second mating surface (6116) matching the first mating surface (6115); The first disc (6112) and the second disc (6113) clamp the lightning protection layer (300) via the first mating surface (6115) and the second mating surface (6116).

3. The wind turbine blade according to claim 1, characterized in that: The peripheral area (6117) of the first plate (6112) is connected to a side of the first plate (6112) away from the second plate (6113).

4. The wind turbine blade according to claim 2, characterized in that: The first mating surface (6115) and the second mating surface (6116) are constructed as curved surfaces and bulge toward the conductive device (500).

5. The wind turbine blade according to claim 2, characterized in that: The first mating surface (6115) and the second mating surface (6116) both include a peripheral region (6117) and a middle region (6118) located within the peripheral region (6117), wherein the peripheral region (6117) is inclined from the middle region (6118) toward a direction away from the conductive device (500), and the middle region (6118) is perpendicular to the axis of the first fastener (612).

6. The wind turbine blade according to claim 5, characterized in that: The peripheral area (6117) is constructed as an inclined surface or a curved surface.

7. The wind turbine blade according to claim 5, characterized in that: The first plate member (6112) and the second plate member (6113) are both provided with a through hole (6111) located in the middle area (6118), and one end of the first fastener (612) passes through the first plate member (6112) and the second plate member (6113) through the through hole (6111).

8. The wind turbine blade according to claim 1, characterized in that: A conductive material is provided between the first disk member (6112) and the second disk member (6113).

9. The wind turbine blade according to claim 8, characterized in that: The conductive material is configured as metal powder or hot-melt metal; The conductive material is arranged in the mesh of the lightning protection layer (300) located between the first plate (6112) and the second plate (6113), and / or between the first plate (6112) and the lightning protection layer (300), and / or between the second plate (6113) and the lightning protection layer (300).

10. The wind turbine blade according to claim 8, characterized in that: The conductive material is configured as conductive foam or metal foil; The conductive material is provided between the first plate (6112) and the lightning protection layer (300), and / or between the second plate (6113) and the lightning protection layer (300).

11. The wind turbine blade according to claim 1, characterized in that: The lightning protection layer (300) is a metal mesh, and the density of the metal mesh decreases from the connection component (600) outwards.

12. The wind turbine blade according to claim 11, characterized in that: The metal mesh is made of any one of copper, aluminum, copper alloy, aluminum alloy, iron, iron alloy, tin alloy and stainless steel; and / or, The metal mesh is formed by cutting and stretching a metal foil, and the mesh of the metal mesh is at least one of a rhombus, a square, a rectangle, and a triangle; and / or, The thickness of the metal mesh is not less than 0.2 mm; and / or, The metal mesh and the connecting plate component (611) are made of the same material.

13. The wind turbine blade according to claim 1, characterized in that: The connecting plate component (611) clamps the lightning protection layer (300) to form a whole structure with the blade body (100) through a perfusion process.

14. The wind turbine blade according to claim 1, characterized in that: The first disc member (6112) and the second disc member (6113) are connected via a second fastener (6119); There are multiple second fasteners (6119), and the multiple second fasteners (6119) are arranged in a ring around the axis of the first fastener (612).

15. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a tower (2000), a nacelle (3000), a hub (4000) and several wind turbine blades (1000) according to any one of claims 1 to 15, wherein the nacelle (3000) is installed at the top of the tower (2000), and the nacelle (3000) is connected to the wind turbine blades (1000) through the hub (4000).

16. A connecting plate component, characterized in that: The connecting disk component (611) includes a first disk component (6112) and a second disk component (6113), wherein: The first disc (6112) and the second disc (6113) are both provided with a through hole (6111); the first disc (6112) has a first mating surface (6115); the second disc (6113) has a second mating surface (6116) matching the first mating surface (6115); at least the peripheral areas (6117) of the first mating surface (6115) and the second mating surface (6116) are inclined in a direction away from the second disc (6113); When the first disc (6112) and the second disc (6113) are connected, the first mating surface (6115) and the second mating surface (6116) are used to clamp the lightning protection layer (300).

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