Wind turbine blade conductive fabric, spar cap and wind turbine blade

Abstract

A wind turbine blade conductive fabric (307), a spar cap (305) and a wind turbine blade (300). The wind turbine blade conductive fabric (307) comprises first brained strands (100) and second braided strands (200), at least some of the plurality of first braided strands (100) comprise conductive materials, and the plurality of first braided strands (100) and the plurality of second braided strands (200) are interwoven with each other; the second braided strands (200) in a first interleaving region (101) and the second braided strands (200) in a second interleaving region (102) are placed on two sides of the first braided strands (100) in the thickness direction, and the first interleaving region (101) and the second interleaving region (102) comprise at least three second braided strands (200). The conductive fabric (307) can solve the technical problem of poor surface flatness of conductive fabric due to a braided structure of existing conductive fabric.

Description

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

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202411328148.8, filed on September 23, 2024, entitled “Wind power blade conductive fabric, main beam and wind power blade”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the field of wind power blades, and particularly relates to a wind power blade conductive fabric, main beam and wind power blade. BACKGROUND

[0004] As an important renewable energy equipment, the safety and stability of a wind turbine generator directly affect the operation efficiency and economic benefits of the entire wind farm. The lightning protection performance of a blade, as one of the key components of a wind turbine generator, is directly related to the lightning protection capability of the entire unit. Once the blade is struck by lightning, not only will the blade itself be damaged, but it may also cause the unit to shut down, electrical system failure and other serious consequences, and even pose a threat to the safe operation of the wind farm.

[0005] In order to reduce the harm of lightning to the wind power blade, equal potential connection is made between the conductors inside the wind power blade, for example, using a conductive fabric for equal potential connection. However, the existing conductive fabric has a poor flatness of the surface due to the weaving structure, thereby causing low contact efficiency between the conductive fabric and the conductor, and a resin layer is easily formed during the pouring process, thereby causing insulation between the conductive fabric and the conductor. SUMMARY

[0006] The present application provides a wind power blade conductive fabric, main beam and wind power blade, which can improve the flatness of the surface of the conductive fabric, improve the contact efficiency with the conductor, reduce the formation of the resin layer, and ensure the conductivity.

[0007] In a first aspect, embodiments of the present application provide a wind turbine blade conductive fabric, comprising: a plurality of first woven strands extending along a first direction and arranged side by side in a second direction, at least a portion of the plurality of first woven strands comprising a conductive material, the first direction and the second direction being intersected; a plurality of second woven strands extending along the second direction and arranged side by side in the first direction, the plurality of first woven strands and the plurality of second woven strands being interwoven with each other; along the first direction, each of the first woven strands and the plurality of second woven strands are interwoven to form first and second staggered areas arranged alternately, the second woven strands in the first staggered area and the second woven strands in the second staggered area being arranged on both sides of the first woven strand in a thickness direction of the first woven strand, and at least three second woven strands being included in the first and second staggered areas.

[0008] According to the wind turbine blade conductive fabric of embodiments of the present application, the number of the second woven strands in the first staggered area and the second staggered area is equal.

[0009] According to the wind turbine blade conductive fabric of embodiments of the present application, along the second direction, the first staggered areas of adjacent first woven strands have a first overlapping area, and the first overlapping area includes at least two second woven strands; the second staggered areas of adjacent first woven strands have a second overlapping area, and the second overlapping area includes at least two second woven strands.

[0010] According to the wind turbine blade conductive fabric of embodiments of the present application, the cross-sectional area of the first woven strand of the conductive material is greater than the cross-sectional area of the second woven strand.

[0011] According to the wind turbine blade conductive fabric of embodiments of the present application, a portion of the first woven strands comprises a non-conductive material, and along the second direction, the first woven strands of the conductive material and the first woven strands of the non-conductive material are arranged alternately side by side.

[0012] According to the wind turbine blade conductive fabric of embodiments of the present application, the conductive material of the first woven strand comprises carbon fiber, and the material of the second woven strand comprises glass fiber.

[0013] According to the wind turbine blade conductive fabric of embodiments of the present application, the first direction is a warp direction, and the second direction is a weft direction.

[0014] In a second aspect, embodiments of the present application also provide a wind turbine blade spar, comprising a pultruded plate and the wind turbine blade conductive fabric described above, the wind turbine blade conductive fabric being laid between the pultruded plates for equal potential connection between the pultruded plates.

[0015] The wind power blade main beam according to the embodiments of the present application, the first woven bundle of the wind power blade conductive fabric is laid along the length direction of the wind power blade main beam.

[0016] In a third aspect, the embodiments of the present application further provide a wind power blade, which comprises the wind power blade conductive fabric described above, or the wind power blade comprises the wind power blade main beam described above.

[0017] The wind power blade conductive fabric, the main beam and the wind power blade according to the embodiments of the present application, a plurality of first woven bundles and a plurality of second woven bundles are interlaced to form a fabric along a first direction and a second direction, at least part of the first woven bundles comprise conductive material, so that the fabric has conductive performance; at least three second woven bundles are included in the first staggered area and the second staggered area of each first woven bundle, so that the surface flatness of the conductive fabric is higher, the contact efficiency between the conductive fabric and the conductor is improved, the probability of forming a resin layer on the surface of the conductive fabric during the pouring process is reduced, and the conductive effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Fig. 1 is a structural schematic diagram of a wind turbine according to some embodiments of the present application;

[0020] Fig. 2 is a schematic diagram of a lightning protection system of a wind power blade according to some embodiments of the present application;

[0021] Fig. 3 is a schematic diagram of a cross section of a wind power blade according to some embodiments of the present application;

[0022] Fig. 4 is a schematic diagram of a partial structure of a main beam according to some embodiments of the present application;

[0023] Fig. 5 shows a schematic diagram of a partial weaving structure of a wind power blade conductive fabric according to some embodiments of the present application;

[0024] Fig. 6 shows a cross-sectional view of A-A in Fig. 5;

[0025] Fig. 7 shows a schematic diagram of a partial weaving structure of a wind power blade conductive fabric according to some embodiments of the present application;

[0026] Fig. 8 shows a schematic diagram of a partial weaving structure of a wind power blade conductive fabric according to some embodiments of the present application;

[0027] Fig. 9 shows a partial enlarged view of C in Fig. 5;

[0028] Fig. 10 shows a cross-sectional view of B-B in Fig. 5.

[0029] 100: first woven bundle; 101: first interlaced region; 102: second interlaced region; 103: first overlapping region; 104: second overlapping region; 200: second woven bundle; 300: wind turbine blade; 301: lightning receptor; 303: outer skin; 304: metal mesh; 305: spar; 306: carbon fiber pultrusion; 307: conductive fabric; 310: generator; 320: tower. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. The following detailed description is merely intended to explain the present application, and is not intended to limit the present application. The present application can be implemented without some of the specific details, which are not necessary for understanding the present application. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0031] It should be noted that the terms such as first and second, etc., are merely 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. Also, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the processes, methods, articles or devices including the elements.

[0032] Fig. 1 is a structural schematic diagram of a wind turbine generator 310 group according to some embodiments of the present application; Fig. 2 is a schematic diagram of a lightning protection system of a wind turbine blade 300 according to some embodiments of the present application; Fig. 3 is a sectional schematic diagram of a wind turbine blade 300 according to some embodiments of the present application; and Fig. 4 is a partially exploded structural schematic diagram of a spar 305 according to some embodiments of the present application.

[0033] As shown in FIG. 1, the wind turbine 310 group is a mechanical device that converts wind energy into electrical energy, and its core function is to generate electricity by capturing the kinetic energy of the wind. The wind turbine 310 group mainly includes wind turbine blades 300, a generator 310, and a tower 320. The wind turbine blades 300 are a good target for lightning discharge due to their high-altitude sharp features, i.e., high height, open space, and sharp shape of the wind turbine blades 300. The high-altitude sharp feature determines that the wind turbine 310 group is highly likely to be struck by lightning, and the huge energy of lightning can cause damage to the wind turbine blades 300, insulation breakdown of the generator 310, and burning of control components, etc., resulting in direct and indirect huge economic losses to the wind farm. In order to avoid the above situation, a lightning protection system is provided on each wind turbine blade 300 to ensure that the lightning current does not cause damage to the wind turbine blades 300 and other parts of the wind turbine 310 group.

[0034] As shown in FIG. 2, the wind turbine blade 300 lightning protection system mainly consists of a lightning arrester 301, a down conductor 302, and a grounding device (not shown in the figure): the lightning arrester 301 is a device used to attract lightning current, and common ones include lightning rods, lightning belts, etc. In the wind turbine blade 300 lightning protection system, the lightning arrester 301 is usually installed at the lightning-striking part of the wind turbine blade 300, such as the blade tip or the edge of the wind turbine blade 300. The lightning arrester 301 uses the principle of sharp-end discharge to attract the 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 arrester 301 to the grounding device. In the wind turbine blade 300 lightning protection system, 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, aluminum, or galvanized steel material and is installed inside the wind turbine blade 300 or at the connection part between the wind turbine blade 300 and the tower 320. For example, a metal mesh 304 is provided outside the outer skin 303 of the wind turbine blade 300, and the metal mesh 304 corresponds to the position of the main beam 305, which is used to protect the main beam 305 from direct lightning strikes. The metal mesh 304 is electrically connected to the lightning arrester 301 at the blade tip through the down conductor, and the metal mesh 304 is connected to the grounding device through the down conductor.

[0036] The grounding device is an equipment that disperses lightning current to the ground, which consists of a grounding electrode, a grounding net, and a grounding wire. In the wind turbine blade 300 lightning protection system, the grounding device needs to ensure that the lightning current can be quickly and effectively discharged to the ground 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 net. The grounding resistance is generally required to be less than 10 ohms to ensure that the lightning current can be quickly discharged.

[0037] As shown in FIG. 3 and FIG. 4, in the wind turbine blade 300, the main beam 305 is taken as an example. Carbon fiber composite material is known for its high strength and light weight. The application of carbon fiber pultruded plate 306 on the main beam 305 of the wind turbine blade 300 can significantly improve the carrying capacity of the main beam 305, while reducing the overall weight of the blade, which is conducive to improving the power generation efficiency and operation stability of the wind turbine generator. The carbon fiber pultruded plate 306 has a high fiber content (up to 70% by volume), which makes the main beam 305 more superior in mechanical properties or bearing state. Compared with other materials, the carbon fiber pultruded plate 306 can better meet the requirements of strength and stiffness of the wind turbine blade 300. Since carbon fiber itself is a conductor, when 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 fibers. Therefore, equipotential bonding needs to be performed in the main beam 305 to ensure that the blade can safely conduct and discharge charges in a lightning environment, and prevent electrical accidents caused by potential difference.

[0038] The main beam 305 connects the carbon fiber pultruded plate 306 with the metal mesh 304 through the conductive fabric 307, and the carbon fiber pultruded plates 306 are equipotentially connected through the conductive fabric 307, so that the potentials at different positions of the main beam 305 are equal or have a small difference.

[0039] Existing conductive fabrics are mostly woven with carbon fibers, but the price of carbon fiber fabric is high, which greatly increases the cost of the lightning protection system, and the permeability of epoxy resin to carbon fiber is poor during the pouring production of the wind turbine blade, and the use of full-carbon fabric is prone to defects. At present, the industry proposes to use a mixed fabric of carbon fiber and glass fiber, i.e., a carbon-glass hybrid fabric, as a conductive fabric to reduce the content of carbon fiber in the fabric and lower the price of the fabric; the glass fiber yarn in the fabric can also improve the permeability of the epoxy resin.

[0040] The existing carbon-glass hybrid fabric is mostly non-crimp fabric (i.e. NCF fabric), which is a non-woven fabric composed of different direction unidirectional layers bound together by stitching or warp-knitted binding yarns. The NCF 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 knitted in the warp direction, they do not cross the thickness direction of the fabric, so the NFC fabric has no conductivity in the thickness direction and is difficult to conductively connect. In order to realize the conductive connection in the thickness direction, the existing carbon-glass hybrid fabric adopts plain weaving. The fabric knitted in plain weave has warp and weft yarns one above the other, forming a crossing in the thickness direction and having thickness direction conductivity. However, since the warp and weft yarns cross every other yarn, there are many interlacing points, and the yarns make a crimping turn within one bundle width, resulting in many yarn bending points, which makes the fabric surface not smooth enough and has obvious frequent concave-convex. As an equipotential layer, the surface of the plain weave fabric has low contact efficiency with the conductor, and during infusion, the resin layer is easily formed at the concave-convex positions of the fabric surface, thereby insulating the fabric from the conductor.

[0041] To solve the problems in the prior art, the embodiments of the present application provide a wind power blade 300 conductive fabric 307, a main beam 305 and a wind power blade 300. First, the wind power blade 300 conductive fabric 307 provided by the embodiments of the present application is introduced.

[0042] FIG. 5 shows a schematic diagram of a partial weaving structure of the wind power blade 300 conductive fabric 307 provided by some embodiments of the present application, and FIG. 6 shows a cross-sectional view of A-A in FIG. 5.

[0043] As shown in FIGS. 5 and 6, the wind power blade 300 conductive fabric 307 provided by the embodiments of the present application includes a first weaving bundle 100 and a second weaving bundle 200. A plurality of first weaving bundles 100 extend in a first direction and are arranged side by side in a second direction. At least a portion of the plurality of first weaving bundles 100 includes a conductive material. The first direction and the second direction intersect. A plurality of second weaving bundles 200 extend in the second direction and are arranged side by side in the first direction. The plurality of first weaving bundles 100 and the plurality of second weaving bundles 200 are interwoven with each other. In the first direction, each first weaving bundle 100 is interwoven with the plurality of second weaving bundles 200 to form alternately arranged first interlaced areas 101 and second interlaced areas 102. The second weaving bundles 200 in the first interlaced areas 101 are arranged on both sides of the first weaving bundle 100 in the thickness direction, and the second weaving bundles 200 in the second interlaced areas 102 are arranged on both sides of the first weaving bundle 100 in the thickness direction. At least three second weaving bundles 200 are included in the first interlaced areas 101 and the second interlaced areas 102.

[0044] The first woven bundle 100 and the second woven bundle 200 are respectively composed of a plurality of yarns, and the yarns in the first woven bundle 100 and the second woven bundle 200 are different in composition. For example, the yarns in the first woven bundle 100 include conductive yarns, and the number of yarns can be the same or different. The second woven bundle 200 can be made of a material that facilitates resin penetration.

[0045] Specifically, at least a part of the plurality of first woven bundles 100 includes a conductive material, that is, along the second direction, all the first woven bundles 100 contain conductive material, or along the second direction, part of the first woven bundles 100 contain conductive material. The more first woven bundles 100 with conductive material, 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 material in the second direction can reduce costs on the basis of ensuring conductive efficiency. The first woven bundle 100 includes a conductive material, so that the conductive fabric 307 has conductivity in the first direction and the second direction.

[0046] The plurality of first woven bundles 100 and the plurality of second woven bundles 200 are interwoven with each other, that is, the first woven bundle 100 and the second woven bundle 200 have interpenetration 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 efficiency of equipotential connection between the pultruded plates and between the pultruded plates and the metal mesh 304 is improved.

[0047] As shown in FIG. 6, along the first direction, each first woven bundle 100 is interwoven with a plurality of second woven bundles 200 to form alternately arranged first staggered regions 101 and second staggered regions 102. The second woven bundles 200 in the first staggered region 101 and the second woven bundles 200 in the second staggered region 102 are arranged on both sides of the first woven bundle 100 in the thickness direction, so that part of each first woven bundle 100 is arranged above the second woven bundle 200, and part of each first woven bundle 100 is arranged below the second woven bundle 200. This achieves the purpose of the conductive fabric 307 having conductive material connected between the first surface and the opposite second surface in the thickness direction.

[0048] In some embodiments, at least three second weft yarns 200 are included in the first staggered zone 101 and the second staggered zone 102, so that the interweaving of the first weft yarns 100 and the second weft yarns 200 of the conductive fabric 307 is more gradual, avoiding the formation of obvious concave-convex 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 more flat, and improving the contact efficiency between the first surface and the second surface of the conductive fabric 307 and the conductor when the conductive fabric 307 is laid at the same potential. During the resin infusion process of the wind turbine blade 300, the resin is more likely to flow on the flat surface of the conductive fabric 307, so that the resin is easy to diffuse and penetrate, and the resin layer is not easy to form on the surface of the conductive fabric 307. For example, three second weft yarns 200 are included in the first staggered zone 101 and the second staggered zone 102, or four second weft yarns 200 are included in the first staggered zone 101 and the second staggered zone 102, or five second weft yarns 200 are included in the first staggered zone 101 and the second staggered zone 102, and so on. Alternatively, four second weft yarns 200 are included in the first staggered zone 101, and three second weft yarns 200 are included in the second staggered zone 102, or three second weft yarns 200 are included in the first staggered zone 101, and four second weft yarns 200 are included in the second staggered zone 102, and so on.

[0049] Compared with the existing satin or twill weaving method, the surface of the conductive fabric 307 of the present application is more flat. In the existing satin and twill, the warp or weft in the staggered zone has one warp or weft, so that the staggered zone is concave or convex, and the surface flatness is obviously reduced. During the infusion process, the resin is easy to form a resin layer in the staggered zone, causing insulation between the upper and lower conductors. In the present application, at least three second weft yarns 200 are provided in the staggered zone, the length of the staggered zone is extended, and the transition of the first staggered zone 101 and the second staggered zone 102 is more gradual, so that the first surface and the second surface of the conductive fabric 307 are more flat.

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

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

[0052] In some embodiments of the present application, the conductive material of the first woven bundle 100 includes carbon fiber, which has extremely high strength and stiffness, while being light in weight, corrosion resistant, fatigue resistant, and electrically conductive. The material of the second woven bundle 200 includes glass fiber, which has the characteristics of light weight, high strength, corrosion resistance, fatigue resistance, and good permeability to resin, and is low in cost.

[0053] Of course, in other embodiments of the present application, the conductive material of the first woven bundle 100 can be copper, silver, nickel, cadmium sulfide, or conductive polymer material. The material of the second woven bundle 200 can 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 woven bundle 100 of conductive material is larger than the cross-sectional area of the second woven bundle 200. After the conductive fabric 307 is woven, the first woven bundle 100 protrudes from the second woven bundle 200, so that the contact effect between the first woven bundle 100 of conductive material and the pultruded plate is better. Moreover, when the cross-sectional area of the first woven bundle 100 of conductive material is larger than the cross-sectional area of the second woven bundle 200, the contact area between the conductive fabric 307 and the pultruded plate is larger after being extruded when the conductive fabric 307 is laid between the pultruded plates.

[0055] In addition, in the conductive fabric 307, the tex number of the first woven bundle 100 of conductive material is greater than or equal to the tex number of the second woven bundle 200. The area weight of the first woven bundle 100 of the conductive fabric 307 is less than or equal to 200 g / m 3 , and the area 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 shows a schematic diagram of a partial weaving structure of the conductive fabric 307 of the wind turbine blade 300 according to some embodiments of the present application.

[0057] In an optional embodiment of the present application, as shown in Figure 7, a part of the first woven bundle 100 includes non-conductive material, and the first woven bundle 100 of conductive material and the first woven bundle 100 of non-conductive material are arranged alternately and side by side along the second direction. For example, 50% of the first woven bundle 100 is conductive material, and 50% is non-conductive material. Specifically, 50% of the first woven bundle 100 is carbon fiber bundle, and 50% is glass fiber bundle, which are arranged alternately along the second direction, thereby reducing the cost of the conductive fabric 307, while improving the resin permeability of the conductive fabric 307 in the first direction.

[0058] Of course, in other embodiments of the present application, the second woven bundle 200 can also be partially made of conductive material, for example, the conductive material is carbon fiber, the second woven bundle 200 includes carbon fiber bundles and glass fiber bundles, and a plurality of glass fiber bundles are arranged between adjacent carbon fiber bundles. Specifically, at least 4 carbon fiber bundles are arranged between adjacent carbon fiber bundles to improve the electrical conductivity of the conductive fabric 307 in the second direction while ensuring the resin infiltration effect in the second direction.

[0059] Figure 8 shows a schematic diagram of a partial weaving structure of the conductive fabric 307 of the wind turbine blade 300 according to some embodiments of the present application.

[0060] As shown in Figure 8, in some embodiments of the present application, the positions of the first staggered area 101 and the second staggered area 102 of the adjacent first woven bundle 100 are opposite. That is, the number of second woven bundles 200 in the first staggered area 101 and the second staggered area 102 is equal, and in the second direction, the first staggered area 101 of one first woven bundle 100 corresponds to the second staggered area 102 of the other first woven bundle 100, and the second staggered area 102 of one first woven bundle 100 corresponds to the first staggered area 101 of the other first woven bundle 100.

[0061] Figure 9 shows a partial enlarged view of C in Figure 5; and Figure 10 shows a cross-sectional view of B-B in Figure 5.

[0062] As shown in Figures 9 and 10, in some specific embodiments of the present application, in order to improve the resin infiltration effect of the conductive fabric 307, in the second direction, the first staggered area 101 of the adjacent first woven bundle 100 has a first overlapping area 103, and the first overlapping area 103 includes at least two second woven bundles 200; the second staggered area 102 of the adjacent first woven bundle 100 has a second overlapping area 104, 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 of the first overlapping area 103 are connected to the adjacent two 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 infiltration effect during the pouring process. On the second surface of the conductive fabric 307, the second woven bundles 200 of the second overlapping area 104 are connected to the adjacent two 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 infiltration effect during the pouring process. That is, 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, taking the example that each of the first overlap region 103 and the second overlap region 104 includes two second woven bundles 200, and each of the first stagger region 101 and the second stagger region 102 includes four second woven bundles 200. The two second woven bundles 200 are arranged at the same position in the first direction, and are arranged below or above the adjacent first woven bundle 100, i.e., forming an overlap region. The two second woven bundles 200 are arranged between the first overlap region 103 and the second overlap region 104. Thus, the conductive fabric 307 has a gentle transition in the second direction, and the surface flatness of the conductive fabric 307 is improved, and the contact efficiency between the conductive fabric 307 and the pultrusion plate is improved.

[0064] In some optional embodiments of the present application, the staggered regions 101 of the adjacent first woven bundles 100 have the same staggered direction. For example, the first first woven bundle 100 includes the first stagger region 101 and the second stagger region 102, and the first stagger region 101 of the second first woven bundle 100 is arranged in a direction away from the second stagger region 102 of the first first woven bundle 100 in the first direction. Similarly, the third first woven bundle 100 is adjacent to the second first woven bundle 100, and the first stagger region 101 of the third first woven bundle 100 is arranged in a direction away from the second stagger region 102 of the second first woven bundle 100 in the first direction. Thus, an inclined line is formed on the first surface or the second surface of the conductive fabric 307, so as to improve the elasticity and firmness of the conductive fabric 307. In the first direction, the second woven bundle 200 in the overlap region can transition between the adjacent two first woven bundles 100, so as to improve the permeation effect of the resin on the conductive fabric 307 during the infusion process.

[0065] As shown in FIGS. 3 and 4, the wind turbine blade spar 305 provided by the embodiments of the present application includes a pultrusion plate and a wind turbine blade conductive fabric 307, and the wind turbine blade conductive fabric 307 is arranged between the pultrusion plates and used for equal potential connection between the pultrusion plates. In the present application, the pultrusion plate itself has conductivity, and the pultrusion plate includes carbon fibers, for example.

[0066] Further, during the infusion process of the wind turbine blade 300, the infusion 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 woven bundle 100 of the wind turbine blade 300 conductive fabric 307 is arranged in the length direction of the wind turbine blade 300 spar 305. The second woven bundle 200 is arranged in the radial direction of the wind turbine blade 300 spar 305. Thus, the second woven bundle 200 can guide the resin in the radial direction, so as to improve the permeation efficiency of the resin.

[0067] The embodiments of the present application also provide a wind turbine blade 300 including the wind turbine blade 300 conductive fabric 307 of the above-mentioned embodiments, or the wind turbine blade 300 including the wind turbine blade 300 spar 305 of the above-mentioned embodiments.

[0068] The wind power blade 300 conductive fabric 307, the main beam 305 and the wind power blade 300 of the embodiment of the application, a plurality of first woven bundles 100 and a plurality of second woven bundles 200 are interlaced to form a fabric along the first direction and the second direction, at least part of the first woven bundle 100 comprises a conductive material, so that the fabric has a conductive property; at least three second woven bundles 200 are included in the first staggered area 101 and the second staggered area 102 of each first woven bundle 100, so that the surface flatness of the conductive fabric 307 is higher, the contact efficiency between the carbon fiber pultrusion plate is improved, the probability of forming a resin layer on the surface of the conductive fabric 307 during the pouring process is reduced, and the conductive effect is improved.

[0069] The above is only a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A wind turbine blade conductive fabric, comprising: a plurality of first bundles of yarns, the plurality of first bundles of yarns extending in a first direction and arranged side by side in a second direction, at least a portion of the plurality of first bundles of yarns comprising an electrically conductive material, the first direction and the second direction intersecting each other; a plurality of second bundles of yarns, the plurality of second bundles of yarns extending in the second direction and arranged side by side in the first direction, the plurality of first bundles of yarns and the plurality of second bundles of yarns interlacing each other; in the first direction, each of the first bundles of yarns interlacing with the plurality of second bundles of yarns to form first and second interlaced regions arranged alternately, the second bundles of yarns in the first interlaced region being arranged on both sides of the first bundles of yarns in the thickness direction, and at least three of the second bundles of yarns being included in the first and second interlaced regions.

2. The wind turbine blade conductive fabric of claim 1, wherein, the number of the second bundles of yarns in the first interlaced region is equal to the number of the second bundles of yarns in the second interlaced region.

3. The wind turbine blade conductive fabric of claim 1, wherein, in the second direction, the first interlaced regions of adjacent first bundles of yarns have a first overlap region, the first overlap region including at least two of the second bundles of yarns; the second interlaced regions of adjacent first bundles of yarns have a second overlap region, the second overlap region including at least two of the second bundles of yarns.

4. The wind turbine blade conductive fabric of claim 1, wherein, the first bundles of yarns comprising the electrically conductive material have a cross-sectional area greater than a cross-sectional area of the second bundles of yarns.

5. The wind turbine blade conductive fabric of claim 1, wherein, a portion of the first bundles of yarns comprise a non-conductive material, the first bundles of yarns comprising the electrically conductive material and the first bundles of yarns comprising the non-conductive material being arranged alternately in the second direction.

6. The wind turbine blade conductive fabric according to any one of claims 1 to 5, wherein, the electrically conductive material of the first bundles of yarns comprises carbon fibers, and the material of the second bundles of yarns comprises glass fibers.

7. The wind turbine blade conductive fabric according to any one of claims 1 to 5, wherein, the first direction is a warp direction, and the second direction is a weft direction.

8. A wind turbine blade spar, wherein, a wind turbine blade conductive fabric as claimed in any one of claims 1 to 7 is arranged between pultruded plates for electrically connecting the pultruded plates.

9. The wind turbine blade spar of claim 8, wherein, the first bundles of yarns of the wind turbine blade conductive fabric are arranged along a length direction of a wind turbine blade spar.

10. A wind turbine blade, wherein, a wind turbine blade as claimed in any one of claims 1 to 7. alternatively, the wind turbine blade comprises a wind turbine blade spar as claimed in claim 8 or 9.

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