Wind power blade conductive fabric, main beam and wind power blade

Abstract

The invention relates to the field of wind power blades, and discloses a wind power blade conductive fabric, a main beam and a wind power blade, the wind power blade conductive fabric comprises a plurality of first woven bundles, at least a part of the first woven bundles comprise conductive materials, and the first woven bundles and the second woven bundles are interwoven; the second woven bundles in the first staggered area and the second woven bundles in the second staggered area are arranged on the two sides of the first woven bundles in the thickness direction, and the first staggered area and the second staggered area at least comprise three second woven bundles. The conductive fabric is used for solving the technical problem that the surface flatness of the conductive fabric is poor due to a weaving structure of an existing conductive fabric, according to the conductive fabric of the wind power blade, the first staggered area and the second staggered area of each first weaving bundle at least comprise three second weaving bundles, so that the surface flatness of the conductive fabric is higher, and the surface flatness of the conductive fabric is improved. The contact efficiency with the conductor is improved, the probability of forming a resin layer on the surface of the conductive fabric in the pouring process is reduced, and the conductive effect is improved.

Description

Technical Field

[0001] The present application belongs to the field of wind turbine blades, and in particular relates to a wind turbine blade conductive fabric, a main beam and a wind turbine blade. Background Art

[0002] As an important renewable energy equipment, the safety and stability of wind turbines directly affect the operating efficiency and economic benefits of the entire wind farm. As one of the key components of wind turbines, the lightning protection performance of blades is directly related to the lightning protection capability of the entire unit. Once the blades are struck by lightning, not only will the blades themselves be damaged, but they may also cause serious consequences such as unit shutdown and electrical system failure, and even pose a threat to the safe operation of the wind farm.

[0003] In order to reduce the damage of lightning to wind turbine blades, equipotential connection is performed between the conductors inside the wind turbine blades, for example, conductive fabric is used for equipotential connection. However, the weaving structure of the existing conductive fabric makes the surface flatness of the conductive fabric poor, resulting in low contact efficiency between the conductive fabric and the conductor, and a resin layer is easily formed during the injection process, resulting in insulation between the conductive fabric and the conductor. Summary of the invention

[0004] The embodiments of the present application provide a wind turbine blade conductive fabric, a main beam and a wind turbine blade, which can improve the flatness of the conductive fabric surface, improve the contact efficiency with the conductor, reduce the formation of the resin layer, and ensure conductivity.

[0005] In a first aspect, an embodiment of the present application provides a conductive fabric for a wind turbine blade, comprising: a first woven bundle, a plurality of the first woven bundles extending along a first direction and arranged side by side in a second direction, at least a portion of the first woven bundles of the plurality of first woven bundles comprising a conductive material, and the first direction and the second direction intersect; a second woven bundle, a plurality of the second woven bundles extending along the second direction and arranged side by side in the first direction, the plurality of first woven bundles and the plurality of second woven bundles being interwoven with each other; along the first direction, each of the first woven bundles is interwoven with a plurality of the second woven bundles to form alternating first and second interwoven bundles, the second woven bundles in the first interwoven bundle and the second interwoven bundles in the second interwoven bundle are placed on both sides of the first woven bundle in a thickness direction, and the first interwoven bundle and the second interwoven bundle include at least three second woven bundles.

[0006] According to the conductive fabric for wind turbine blades of the embodiment of the present application, the numbers of the second woven bundles in the first interlaced area and the second interlaced area are equal.

[0007] According to the conductive fabric of a wind turbine blade according to an embodiment of the present application, along the second direction, there is a first overlapping area between the first interlaced areas of adjacent first woven bundles, and the first overlapping area includes at least two second woven bundles; there is a second overlapping area between the second interlaced areas of adjacent first woven bundles, and the second overlapping area includes at least two second woven bundles.

[0008] According to the wind turbine blade conductive fabric of the embodiment of the present application, the cross-sectional area of ​​the first woven bundle of conductive material is greater than the cross-sectional area of ​​the second woven bundle.

[0009] According to the wind turbine blade conductive fabric of the embodiment of the present application, a portion of the first woven bundles include non-conductive material, and along the second direction, the first woven bundles of conductive material and the first woven bundles of non-conductive material are alternately arranged in parallel.

[0010] According to the wind turbine blade conductive fabric of the embodiment of the present application, the conductive material of the first braided bundle includes carbon fiber, and the material of the second braided bundle includes glass fiber.

[0011] According to the wind turbine blade conductive fabric of the embodiment of the present application, the first direction is the warp direction, and the second direction is the weft direction.

[0012] In a second aspect, an embodiment of the present application further provides a wind turbine blade main beam, comprising a pultruded plate and the above-mentioned wind turbine blade conductive fabric, wherein the wind turbine blade conductive fabric is laid between the pultruded plates for equipotential connection between the pultruded plates.

[0013] According to the wind turbine blade main beam of the embodiment of the present application, the first woven bundle of the wind turbine blade conductive fabric is laid along the length direction of the wind turbine blade main beam.

[0014] In a third aspect, an embodiment of the present application further provides a wind turbine blade, comprising the above-mentioned wind turbine blade conductive fabric; or, the wind turbine blade comprises the above-mentioned wind turbine blade main beam.

[0015] The wind turbine blade conductive fabric, main beam and wind turbine blade of the embodiments of the present application are composed of multiple first woven bundles and multiple second woven bundles interwoven along the first direction and the second direction to form a fabric, and at least part of the first woven bundles include conductive material, so that the fabric has conductive properties; each first woven bundle includes at least three second woven bundles in the first interlaced area and the second interlaced area, so that the surface flatness of the conductive fabric is higher, the contact efficiency with the conductor is improved, the probability of forming a resin layer on the surface of the conductive fabric during the infusion process is reduced, and the conductive effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic diagram of the structure of a wind turbine generator set according to some embodiments of the present application;

[0018] Figure 2 A schematic diagram of a lightning protection system for wind turbine blades according to some embodiments of the present application;

[0019] Figure 3 A schematic cross-sectional view of a wind turbine blade according to some embodiments of the present application;

[0020] Figure 4 A schematic diagram of a partial exploded structure of a main beam in some embodiments of the present application;

[0021] Figure 5 One of the schematic diagrams of the partial weaving structure of the conductive fabric of a wind turbine blade provided in some embodiments of the present application is shown;

[0022] Figure 6 Show Figure 5 Sectional view along AA direction;

[0023] Figure 7 A second schematic diagram of a partial weaving structure of a wind turbine blade conductive fabric provided in some embodiments of the present application is shown;

[0024] Figure 8 The third schematic diagram of the partial weaving structure of the conductive fabric of a wind turbine blade provided by some embodiments of the present application is shown;

[0025] Fig. 9 Show Figure 5 A partial enlarged view of point C in the middle;

[0026] Fig.10 Show Figure 5 Cross-sectional view along the BB direction.

[0027] Reference numerals:

[0028] 100: first braided bundle; 101: first interlaced area; 102: second interlaced area; 103: first overlapping area; 104: second overlapping area; 200: second braided bundle;

[0029] 300: wind turbine blade; 301: lightning arrester; 303: outer skin; 304: metal mesh; 305: main beam; 306: carbon fiber pultruded plate; 307: conductive fabric; 310: generator; 320: tower. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0032] Figure 1 A schematic diagram of the structure of a wind turbine generator 310 group according to some embodiments of the present application; Figure 2 A schematic diagram of a lightning protection system for a wind turbine blade 300 according to some embodiments of the present application; Figure 3 A schematic cross-sectional view of a wind turbine blade 300 according to some embodiments of the present application; Figure 4 This is a schematic diagram of a partial decomposition structure of the main beam 305 of some embodiments of the present application.

[0033] like Figure 1As shown, the wind turbine generator 310 group is a mechanical device that converts wind energy into electrical energy, and its core function is to generate electrical energy by capturing the kinetic energy of wind. The wind turbine generator 310 group mainly includes wind turbine blades 300, generators 310 and towers 320. The wind turbine blades 300 are a good target for lightning discharge due to their high-altitude sharp features, that is, they are high in height, located in an open area, and the wind turbine blades 300 are sharp in shape. The high-altitude sharp features determine that the probability of the wind turbine generator 310 group being struck by lightning is extremely high, and the huge energy of lightning may cause damage to the wind turbine blades 300, insulation breakdown of the generator 310, burning of control components and other faults, causing direct and indirect huge economic losses to the wind farm. In order to avoid the above situation, a lightning protection system is set on each wind turbine blade 300 to ensure that the lightning current will not cause damage to the wind turbine blades 300 and other parts of the wind turbine generator 310 group.

[0034] like Figure 2 As shown, the lightning protection system of the wind turbine blade 300 mainly consists of three parts: a lightning receptor 301, a down conductor 302 and a grounding device (not shown in the figure): the lightning receptor 301 is a device used to attract lightning current, and common ones include lightning rods, lightning strips, etc. In the lightning protection system of the wind turbine blade 300, the lightning receptor 301 is usually installed at a part of the wind turbine blade 300 that is prone to lightning strike, such as the blade tip or the edge of the wind turbine blade 300. The lightning receptor 301 uses the principle of tip discharge to attract nearby lightning current and guide it to the down conductor.

[0035] The down conductor is a conductor that guides the lightning current from the lightning rod 301 to the grounding device. In the lightning protection system of the wind turbine blade 300, the down conductor needs to have good electrical conductivity and corrosion resistance to ensure that the lightning current can be smoothly and safely transmitted to the ground. The down conductor is usually made of copper or galvanized steel material and is installed inside the wind turbine blade 300 or at the connection between the wind turbine blade 300 and the tower 320. For example, a metal mesh 304 is arranged on the outside of the outer skin 303 of the wind turbine blade 300. The metal mesh 304 corresponds to the position of the main beam 305 and is used to protect the main beam 305 from being directly struck by lightning. The metal mesh 304 is electrically connected to the lightning rod 301 at the tip of the blade through the down conductor, and the metal mesh 304 is connected to the grounding device through the down conductor.

[0036] The grounding device is a device that disperses lightning current to the earth. It consists of a grounding electrode, a grounding grid, and a grounding wire. In the lightning protection system of the wind turbine blade 300, the grounding device needs to ensure that the lightning current can be quickly and effectively discharged into the earth to reduce damage to the wind turbine blade 300 and the unit. The grounding electrode should be buried in a place with low soil resistivity and form a good electrical connection with the grounding grid. The grounding resistance is generally required to be less than 10 ohms to ensure that the lightning current can be quickly discharged.

[0037] like Figure 3 and Figure 4 As shown, in the wind turbine blade 300, the main beam 305 is taken as an example. Carbon fiber composite materials are known for their high strength and light weight. Applying carbon fiber pultruded plate 306 on the main beam 305 of the wind turbine blade 300 can significantly improve the bearing capacity of the main beam 305, while reducing the overall weight of the blade, which is beneficial to improving the power generation efficiency and operation stability of the wind turbine. The carbon fiber pultruded plate 306 has a high fiber content (up to 70% volume content), which makes the main beam 305 more superior in mechanical properties or load-bearing state. Compared with other materials, the carbon fiber pultruded plate 306 can better meet the requirements of the wind turbine blade 300 for strength and stiffness. Since carbon fiber itself is a conductor, when the lightning current passes through the lightning protection system, high voltage and large current will be induced in the carbon fiber. There is a risk of electrical breakdown between the lightning protection system and the carbon fiber, and between the carbon fiber and the carbon fiber. Therefore, equipotential connection is required in the main beam 305 to ensure that the blade can safely conduct and discharge electric charge in a lightning environment to prevent electrical accidents caused by potential differences.

[0038] The main beam 305 connects the carbon fiber pultruded plates 306 and the metal mesh 304 through the conductive fabric 307 , and the carbon fiber pultruded plates 306 are connected to each other at the same potential through the conductive fabric 307 , so that the potentials at various locations of the main beam 305 are equal or have a small difference.

[0039] Existing conductive fabrics are mostly woven from carbon fiber, but the price of carbon fiber fabrics is high, which greatly increases the cost of lightning protection systems. In addition, during the production of wind turbine blades, epoxy resin has poor penetration into carbon fiber, and the use of all-carbon fabrics is prone to defects. At present, the industry proposes to use a blended fabric of carbon fiber and glass fiber, namely carbon-glass blended fabric, as a conductive fabric to reduce the carbon fiber content in the fabric and reduce the fabric price; the glass fiber yarn in the fabric can also improve the penetration of epoxy resin.

[0040] Most of the existing carbon-glass hybrid fabrics are non-curled fabrics (i.e., NFC fabrics). NFC fabrics are non-woven fabrics composed of unidirectional layers in different directions bound together by stitching or warp knitting binding yarns. The NFC fabric structure allows the fibers of each layer to be placed in different directions or axes, thereby providing strength and stiffness in multiple directions. Since the yarns are woven in the warp direction and will not pass through the thickness direction of the fabric, the NFC fabric has no conductivity in the thickness direction and is difficult to conduct conductive connections. In order to achieve conductive connections in the thickness direction, the existing carbon-glass hybrid fabrics are plain woven. The plain woven fabrics have warp and weft lines that are up and down, forming a crossing in the thickness direction, and have thickness-direction conductivity. However, since the warp and weft yarns are staggered every other yarn, there are many interlacing points, and the yarns complete the curling turn within the width of a tow, and there are many yarn bending points, making the fabric surface not flat enough and having obvious frequent bumps. When used as an equipotential layer, the contact efficiency between the plain fabric surface and the conductor is low, and during infusion, the concave and convex positions on the fabric surface are prone to produce a resin layer, which insulates the fabric from the conductor.

[0041] In order to solve the problems of the prior art, the embodiment of the present application provides a wind turbine blade 300 conductive fabric 307, a main beam 305 and a wind turbine blade 300. The conductive fabric 307 of the wind turbine blade 300 provided in the embodiment of the present application is first introduced below.

[0042] Figure 5 One of the partial weaving structure schematic diagrams of the conductive fabric 307 of the wind turbine blade 300 provided in some embodiments of the present application is shown. Figure 6 Show Figure 5 Sectional view along AA direction.

[0043] like Figure 5 and Figure 6 As shown, an embodiment of the present application provides a conductive fabric 307 for a wind turbine blade 300, including a first woven bundle 100 and a second woven bundle 200, wherein a plurality of first woven bundles 100 extend along a first direction and are arranged side by side in a second direction, and at least a portion of the first woven bundles 100 in the plurality of first woven bundles 100 include a conductive material, and the first direction and the second direction intersect; a plurality of second woven bundles 200 extend along the second direction and are arranged side by side in the first direction, and a plurality of first woven bundles 100 and a plurality of second woven bundles 200 are interwoven with each other; along the first direction, each first woven bundle 100 is interwoven with a plurality of second woven bundles 200 to form alternating first interlaced areas 101 and second interlaced areas 102, and the second woven bundles 200 in the first interlaced area 101 and the second interlaced area 102 are placed on both sides of the first woven bundle 100 in a thickness direction, and the first interlaced area 101 and the second interlaced area 102 include at least three second woven bundles 200.

[0044] The first braided bundle 100 and the second braided bundle 200 are respectively obtained by winding a plurality of yarns, and the yarn components in the first braided bundle 100 and the second braided bundle 200 are different. For example, the yarn in the first braided bundle 100 includes conductive yarns, and the number of yarns can be the same or different. The second braided bundle 200 can be made of a material that is conducive to resin penetration.

[0045] Specifically, at least a portion of the first woven bundles 100 in the plurality of first woven bundles 100 include conductive materials, that is, along the second direction, all of the first woven bundles 100 include conductive materials, or, along the second direction, a portion of the first woven bundles 100 include conductive materials. The more first woven bundles 100 with conductive materials, the better the conductive efficiency of the conductive fabric 307, but the higher the cost. Adjusting the number of first woven bundles 100 with conductive materials in the second direction can reduce costs while ensuring conductive efficiency. The first woven bundles 100 include conductive materials, so that the conductive fabric 307 has conductivity in the first direction and the second direction.

[0046] The plurality of first braided bundles 100 and the plurality of second braided bundles 200 are interlaced with each other, that is, the first braided bundles 100 and the second braided bundles 200 are interlaced in the thickness direction, so that the conductive fabric 307 has conductivity in the thickness direction. Thus, the conductive fabric 307 has conductivity in all directions, and when the conductive fabric 307 is laid between the pultruded plates, the equipotential connection efficiency between the pultruded plates and between the pultruded plates and the metal mesh 304 is improved.

[0047] Among them, Figure 6 As shown, along the first direction, each first woven bundle 100 is interwoven with multiple second woven bundles 200 to form alternating first interlaced areas 101 and second interlaced areas 102, and the second woven bundles 200 in the first interlaced areas 101 and the second woven bundles 200 in the second interlaced areas 102 are placed on both sides of the first woven bundle 100 in the thickness direction, so that a part of each first woven bundle 100 is placed above the second woven bundle 200, and a part is placed below the second woven bundle 200, so that the conductive fabric 307 has a connected conductive material between the first surface and the opposite second surface, thereby achieving the purpose of conductivity in the thickness direction.

[0048] In some embodiments, the first interlaced area 101 and the second interlaced area 102 include at least three second braided bundles 200, so that the interweaving of the first braided bundle 100 and the second braided bundle 200 of the conductive fabric 307 is smoother, avoiding the formation of obvious bumps and grooves on the first surface and the second surface of the conductive fabric 307, making the first surface and the second surface of the conductive fabric 307 smoother, and improving the contact efficiency between the first surface and the second surface of the conductive fabric 307 and the conductor during equipotential laying. During the pouring process of the wind turbine blade 300, the resin is easier to flow on the smooth surface of the conductive fabric 307, so that the resin is easy to diffuse and penetrate, and it is not easy to form a resin layer on the surface of the conductive fabric 307. For example, the first interlaced area 101 and the second interlaced area 102 include three second braided bundles 200, or the first interlaced area 101 and the second interlaced area 102 include four second braided bundles 200, or the first interlaced area 101 and the second interlaced area 102 include five second braided bundles 200, etc. Alternatively, the first interlaced area 101 includes four second braided bundles 200, and the second interlaced area 102 includes three second braided bundles 200, or the first interlaced area 101 includes three second braided bundles 200, and the second interlaced area 102 includes four second braided bundles 200, and other combinations.

[0049] Compared with the existing satin or twill weaving methods, the surface of the conductive fabric 307 of the present application is smoother. The warp or weft surface of the existing satin and twill has a warp or weft in the interlaced area, which causes the interlaced area to be concave or convex, and the surface flatness is significantly reduced. During the infusion process, the resin is easy to form a resin layer in this interlaced area, resulting in insulation between the conductors of the upper and lower layers. However, at least three second braided bundles 200 are arranged in the interlaced area of ​​the present application, extending the length of the interlaced area, making the transition between the first interlaced area 101 and the second interlaced area 102 smoother, thereby achieving a smoother first surface and second surface of the conductive fabric 307.

[0050] In an optional embodiment of the present application, the first direction is the warp direction, and the second direction is the weft direction. When the conductive fabric 307 is woven in this direction, during the laying process of the wind turbine blade 300, the first woven bundle 100 is arranged along the span direction of the wind turbine blade 300, and the second woven bundle 200 is arranged along the radial direction of the wind turbine blade 300. The direction of the second woven bundle 200 is more conducive to the penetration of the resin.

[0051] In some embodiments of the present application, the number of second braided bundles 200 in the first interlaced area 101 and the second interlaced area 102 is equal. Thus, the area of ​​the first braided bundles 100 with conductive material on the first surface of the conductive fabric 307 is equal to the area of ​​the first braided bundles 100 with conductive material on the second surface, so that the contact area between the conductive fabric 307 and the upper and lower conductors is equal, the potential difference is smaller, and the probability of damage to the wind turbine blade 300 is reduced.

[0052] In some embodiments of the present application, the conductive material of the first braided bundle 100 includes carbon fiber, which has extremely high strength and rigidity, and is light, corrosion-resistant, fatigue-resistant, and has good conductivity. The material of the second braided bundle 200 includes glass fiber, which has the characteristics of light weight, high strength, corrosion resistance, fatigue resistance, etc., good penetration effect on resin, and low cost.

[0053] Of course, in other embodiments of the present application, the conductive material of the first braided bundle 100 may be copper, silver, nickel, cadmium sulfide, etc. The material of the second braided bundle 200 may also be nylon fiber, bamboo fiber, hemp fiber, etc.

[0054] In addition, in other embodiments of the present application, the cross-sectional area of ​​the first braided bundle 100 of the conductive material is greater than the cross-sectional area of ​​the second braided bundle 200. After the conductive fabric 307 is woven, the first braided bundle 100 protrudes from the second braided bundle 200, so that the contact effect between the first braided bundle 100 with the conductive material and the pultruded plate is better. In addition, when the cross-sectional area of ​​the first braided bundle 100 of the conductive material is greater than the cross-sectional area of ​​the second braided bundle 200, when the conductive fabric 307 is laid between the pultruded plates, the contact area with the pultruded plates will be larger after being squeezed.

[0055] In addition, in the conductive fabric 307, the tex number (tex number) of the first woven bundle 100 of the conductive material is greater than or equal to the tex number (tex number) of the second woven bundle 200. The surface weight of the first woven bundle 100 of the conductive fabric 307 is less than or equal to 200g / m 3 The surface weight of the second woven bundle 200 of the conductive fabric 307 is less than or equal to 200 g / m 3 .

[0056] Figure 7 A second schematic diagram of a partial weaving structure of the conductive fabric 307 of a wind turbine blade 300 provided in some embodiments of the present application is shown.

[0057] In an optional embodiment of the present application, Figure 7As shown, a portion of the first woven bundle 100 includes a non-conductive material, and along the second direction, the first woven bundle 100 of the conductive material and the first woven bundle 100 of the non-conductive material are alternately arranged in parallel. For example, 50% of the first woven bundle 100 is a conductive material, and 50% is a non-conductive material. Specifically, 50% of the first woven bundle 100 is a carbon fiber bundle and 50% is a glass fiber bundle. The carbon fiber bundle and the glass fiber bundle are alternately arranged along the second direction, thereby reducing the cost of the conductive fabric 307 and improving the resin penetration effect of the conductive fabric 307 in the first direction.

[0058] Of course, in other embodiments of the present application, the second woven bundle 200 may also partially use a conductive material, for example, the conductive material is carbon fiber, and the second woven bundle 200 includes a carbon fiber bundle and a glass fiber bundle, and a plurality of glass fiber bundles are arranged between adjacent carbon fiber bundles. Specifically, at least four carbon fiber bundles are arranged between adjacent carbon fiber bundles to improve the conductivity of the conductive fabric 307 in the second direction, while ensuring the desired resin penetration effect.

[0059] Figure 8 A third schematic diagram of a partial weaving structure of the conductive fabric 307 of a wind turbine blade 300 provided in some embodiments of the present application is shown.

[0060] like Figure 8 As shown, in some embodiments of the present application, the positions of the first interlaced regions 101 and the second interlaced regions 102 of adjacent first braided bundles 100 are opposite. That is, the number of second braided bundles 200 in the first interlaced regions 101 and the second interlaced regions 102 is equal, and along the second direction, the first interlaced region 101 of one first braided bundle 100 corresponds to the second interlaced region 102 of another first braided bundle 100, and the second interlaced region 102 of one first braided bundle 100 corresponds to the first interlaced region 101 of another first braided bundle 100.

[0061] Fig. 9 Show Figure 5 A partial enlarged view of point C in the middle; Fig.10 Show Figure 5 Cross-sectional view along the BB direction.

[0062] like Fig. 9 and Fig.10As shown, in some other specific embodiments of the present application, in order to improve the resin penetration effect of the conductive fabric 307, along the second direction, there is a first overlapping area 103 between the first interlaced areas 101 of adjacent first woven bundles 100, and the first overlapping area 103 includes at least two second woven bundles 200; there is a second overlapping area 104 between the second interlaced areas 102 of adjacent first woven bundles 100, and the second overlapping area 104 includes at least two second woven bundles 200. On the first surface of the conductive fabric 307, the second woven bundles 200 in the first overlapping area 103 are connected to the two adjacent first woven bundles 100 in the second direction in the first direction, effectively guiding the resin on the surface of the conductive fabric 307, and improving the resin penetration effect during the infusion process. On the second surface of the conductive fabric 307, the second woven bundles 200 in the second overlapping area 104 are connected to the two adjacent first woven bundles 100 in the second direction in the first direction, effectively guiding the resin on the surface of the conductive fabric 307, and improving the resin penetration effect during the infusion process. That is to say, the first overlapping area 103 and the second overlapping area 104 have a flow-guiding effect on both surfaces of the conductive fabric 307 .

[0063] Specifically, take the example that the first interlaced area 101 and the second interlaced area 102 each include four second braided bundles 200, and the first overlapping area 103 and the second overlapping area 104 each include two second braided bundles 200. The two second braided bundles 200 are at the same position in the first direction, and are placed below or above the adjacent first braided bundles 100, that is, an overlapping area is formed. Two second braided bundles 200 are included between the first overlapping area 103 and the second overlapping area 104. The conductive fabric 307 has a smooth transition in the second direction, improves the surface flatness of the conductive fabric 307, and improves the contact efficiency between the conductive fabric 307 and the pultruded plate.

[0064] In some optional embodiments of the present application, the dislocation directions of the first interlaced regions 101 in adjacent first braided bundles 100 are the same. For example, the first first braided bundle 100 includes adjacent first interlaced regions 101 and second interlaced regions 102, and the first interlaced region 101 of the second first braided bundle 100 is arranged in a direction away from the second interlaced region 102 of the first first braided bundle 100 along the first direction. By analogy, the third first braided bundle 100 is adjacent to the second first braided bundle 100, and the first interlaced region 101 of the third first braided bundle 100 is arranged in a direction away from the second interlaced region 102 of the second first braided bundle 100 along the first direction. Thus, an inclined pattern is formed on the first surface or the second surface of the conductive fabric 307 to improve the elasticity and firmness of the conductive fabric 307. And in the first direction, the second braided bundle 200 in the overlapping area can transition between the two adjacent first braided bundles 100, thereby improving the penetration effect of the conductive fabric 307 on the resin during the infusion process.

[0065] like Figure 3 and Figure 4 As shown, the embodiment of the present application provides a main beam 305 of a wind turbine blade 300, including a pultruded plate and a conductive fabric 307 of the wind turbine blade 300. The conductive fabric 307 of the wind turbine blade 300 is laid between the pultruded plates for equipotential connection between the pultruded plates.

[0066] Furthermore, during the pouring process of the wind turbine blade 300, pouring ports are arranged at intervals in the length direction of the wind turbine blade 300. Therefore, in one embodiment of the present application, the first braided bundle 100 of the conductive fabric 307 of the wind turbine blade 300 is laid along the length direction of the main beam 305 of the wind turbine blade 300. The second braided bundle 200 is laid along the radial direction of the main beam 305 of the wind turbine blade 300. Thus, the second braided bundle 200 can guide the resin in the radial direction, thereby improving the penetration efficiency of the resin.

[0067] The embodiment of the present application further provides a wind turbine blade 300 , comprising the conductive fabric 307 of the wind turbine blade 300 of the above embodiment; or, the wind turbine blade 300 comprises the main beam 305 of the wind turbine blade 300 of the above embodiment.

[0068] The wind turbine blade 300 conductive fabric 307, main beam 305 and wind turbine blade 300 of the embodiment of the present application, multiple first woven bundles 100 and multiple second woven bundles 200 are interwoven along the first direction and the second direction to form a fabric, at least part of the first woven bundles 100 include conductive material, so that the fabric has conductive properties; each first woven bundle 100 includes at least three second woven bundles 200 in the first interlaced area 101 and the second interlaced area 102, so that the surface flatness of the conductive fabric 307 is higher, the contact efficiency with the conductor is improved, the probability of forming a resin layer on the surface of the conductive fabric 307 during the infusion process is reduced, and the conductive effect is improved.

[0069] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A conductive fabric for wind turbine blades, It is characterized in that include: A first braided bundle (100), wherein a plurality of the first braided bundles (100) extend along a first direction and are arranged side by side in a second direction, at least a portion of the first braided bundles (100) among the plurality of the first braided bundles (100) comprises a conductive material, and the first direction and the second direction intersect; A second braided bundle (200), wherein a plurality of the second braided bundles (200) extend along the second direction and are arranged side by side in the first direction, and a plurality of the first braided bundles (100) and a plurality of the second braided bundles (200) are interwoven with each other; Along the first direction, each of the first braided bundles (100) is interwoven with a plurality of the second braided bundles (200) to form alternately arranged first interlaced areas (101) and second interlaced areas (102); the second braided bundles (200) in the first interlaced area (101) and the second braided bundles (200) in the second interlaced area (102) are arranged on both sides of the first braided bundle (100) in the thickness direction, and the first interlaced area (101) and the second interlaced area (102) include at least three second braided bundles (200).

2. The wind turbine blade conductive fabric according to claim 1, It is characterized in that The number of the second braided bundles (200) in the first interlaced area (101) and the number of the second interlaced area (102) are equal.

3. The wind turbine blade conductive fabric according to claim 1, It is characterized in that Along the second direction, there is a first overlapping area (103) between the first interlaced areas (101) of adjacent first braided bundles (100), and the first overlapping area (103) includes at least two of the second braided bundles (200); A second overlapping area (104) is provided between the second interlaced areas (102) of adjacent first braided bundles (100), and the second overlapping area (104) includes at least two of the second braided bundles (200).

4. The wind turbine blade conductive fabric according to claim 1, It is characterized in that The cross-sectional area of ​​the first woven bundle (100) of conductive material is greater than the cross-sectional area of ​​the second woven bundle (200).

5. The wind turbine blade conductive fabric according to claim 1, It is characterized in that A portion of the first braided bundles (100) comprises a non-conductive material, and along the second direction, the first braided bundles (100) of conductive material and the first braided bundles (100) of non-conductive material are alternately arranged in parallel.

6. The wind turbine blade conductive fabric according to any one of claims 1 to 5, It is characterized in that The conductive material of the first braided bundle (100) includes carbon fiber, and the material of the second braided bundle (200) includes glass fiber.

7. The wind turbine blade conductive fabric according to any one of claims 1 to 5, It is characterized in that The first direction is a longitude direction, and the second direction is a latitude direction.

8. A wind turbine blade main beam, It is characterized in that The invention comprises a pultruded plate and a conductive fabric (307) for a wind turbine blade (300) according to any one of claims 1 to 7, wherein the conductive fabric (307) for a wind turbine blade (300) is laid between the pultruded plates and used for equipotential connection between the pultruded plates.

9. The wind turbine blade main beam according to claim 8, It is characterized in that The first woven bundle (100) of the conductive fabric (307) of the wind turbine blade (300) is laid along the length direction of the main beam (305) of the wind turbine blade (300).

10. A wind turbine blade, It is characterized in that A wind turbine blade (300) conductive fabric (307) comprising any one of claims 1 to 7; Alternatively, the wind turbine blade (300) comprises the wind turbine blade (300) main beam (305) according to claim 8 or 9.

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