Wind turbine blade conductive fabric, spar and wind turbine blade

Abstract

The application relates to the field of wind power blades, and discloses a wind power blade conductive fabric, a main beam and a wind power blade, wherein the wind power blade conductive fabric comprises a plurality of first weaving bundles, at least part of the first weaving bundles comprises a conductive material, the plurality of first weaving bundles and the plurality of second weaving bundles are interwoven, the second weaving bundles in the first staggered area are arranged on both sides of the first weaving bundles in the thickness direction, the second weaving bundles in the second staggered area are arranged on both sides of the first weaving bundles in the thickness direction, and at least three second weaving bundles are arranged in the first staggered area and the second staggered area. The technical problem that the weaving structure of the existing conductive fabric makes the surface flatness of the conductive fabric poor is solved, the wind power blade conductive fabric of the embodiment of the application comprises at least three second weaving bundles in the first staggered area and the second staggered area of each first weaving bundle, the surface flatness of the conductive fabric is higher, the contact efficiency between the conductive fabric and the conductor is improved, the probability that a resin layer is formed 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 power blades, and particularly relates to a wind power blade conductive fabric, a main beam and a wind power blade. BACKGROUND

[0002] As important renewable energy equipment, the safety and stability of a wind turbine 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 the wind turbine, 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 also serious consequences such as unit shutdown, electrical system failure and even threats to the safe operation of the wind farm may be caused.

[0003] In order to reduce the harm of lightning to the wind power blade, equal potential connection is performed between the conductors inside the wind power blade, for example, equal potential connection is performed by using a conductive fabric. However, the weaving structure of the existing conductive fabric makes the flatness of the surface of the conductive fabric poor, thereby causing low contact efficiency between the conductive fabric and the conductor, and a resin layer is easily formed in the pouring process, thereby causing insulation between the conductive fabric and the conductor. SUMMARY

[0004] The wind power blade conductive fabric, the main beam and the wind power blade provided by the embodiments of the present application 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.

[0005] In a first aspect, the embodiments of the present application provide a wind power blade conductive fabric, comprising: a first weaving bundle, a plurality of the first weaving bundles extend along a first direction and are arranged in parallel in a second direction, at least part of the plurality of the first weaving bundles comprises a conductive material, and the first direction and the second direction intersect; a second weaving bundle, a plurality of the second weaving bundles extend along the second direction and are arranged in parallel in the first direction, and the plurality of the first weaving bundles and the plurality of the second weaving bundles are interwoven; along the first direction, each of the first weaving bundles and the plurality of the second weaving bundles are interwoven to form alternately arranged first staggered areas and second staggered areas, the second weaving bundles in the first staggered areas and the second weaving bundles in the second staggered areas are arranged on both sides of the first weaving bundle in a thickness direction of the first weaving bundle, and at least three of the second weaving bundles are included in the first staggered areas and the second staggered areas.

[0006] According to the wind power blade conductive fabric of the embodiments of the present application, the number of the second weaving bundles in the first staggered areas and the second staggered areas is equal.

[0007] According to the wind power blade conductive fabric of the embodiment of the present application, along the second direction, the first overlap area is between the first staggered areas of the adjacent first woven bundles, and the first overlap area includes at least two second woven bundles; and the second overlap area is between the second staggered areas of the adjacent first woven bundles, and the second overlap area includes at least two second woven bundles.

[0008] According to the wind power 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 power blade conductive fabric of the embodiment of the present application, a part of the first woven bundle includes non-conductive material, and along the second direction, the first woven bundle of conductive material and the first woven bundle of non-conductive material are arranged alternately and side by side.

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

[0011] According to the wind power 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, the embodiment of the present application further provides a wind power blade girder, including a pultrusion plate and the wind power blade conductive fabric described above, the wind power blade conductive fabric is laid between the pultrusion plates, and is used for equal potential connection between the pultrusion plates.

[0013] According to the wind power blade conductive fabric of the embodiment 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 girder.

[0014] In a third aspect, the embodiment of the present application further provides a wind power blade, including the wind power blade conductive fabric described above; or the wind power blade includes the wind power blade girder described above.

[0015] The wind power blade conductive fabric, the girder and the wind power blade of the embodiment of the present application, a plurality of first woven bundles and a plurality of second woven bundles are interwoven to form a fabric along a first direction and a second direction, at least part of the first woven bundles include conductive material, so that the fabric has conductive performance; the first staggered area and the second staggered area of each first woven bundle include at least three second woven bundles, so that the surface flatness of the conductive fabric is higher, the contact efficiency between 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

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced. Those drawings can help the ordinary skilled in the art to obtain other drawings without any creative effort.

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

[0018] Figure 2 Lightning protection system schematic diagram of a wind turbine blade according to some embodiments of the present application;

[0019] Figure 3 Sectional schematic diagram of a wind turbine blade according to some embodiments of the present application;

[0020] Figure 4 Partial exploded structure schematic diagram of a main beam according to some embodiments of the present application;

[0021] Figure 5 Partial weaving structure schematic diagram of a wind turbine blade conductive fabric according to some embodiments of the present application is shown;

[0022] Figure 6 Partial weaving structure schematic diagram of a wind turbine blade conductive fabric according to some embodiments of the present application is shown; Figure 5 Partial view along the A-A direction;

[0023] Figure 7 Partial weaving structure schematic diagram of a wind turbine blade conductive fabric according to some embodiments of the present application is shown;

[0024] Figure 8 Partial weaving structure schematic diagram of a wind turbine blade conductive fabric according to some embodiments of the present application is shown;

[0025] Figure 9 Partial weaving structure schematic diagram of a wind turbine blade conductive fabric according to some embodiments of the present application is shown; Figure 5 Partial enlarged view at C;

[0026] Figure 10 Partial weaving structure schematic diagram of a wind turbine blade conductive fabric according to some embodiments of the present application is shown; Figure 5 Sectional view along the B-B direction.

[0027] Reference signs:

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

[0029] 300: wind turbine blade; 301: lightning arrester; 302: down conductor; 303: outer skin; 304: metal mesh; 305: main beam; 306: carbon fiber pultrusion plate; 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 teach a person skilled in the art how to make and use the best mode of the present application and is not intended to limit the scope of the application. Therefore, specific structural and functional details disclosed herein are not to be interpreted in a manner that

[0031] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve to identify a distinction between two entities or operations, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprising", "containing" or any other similar term are intended to encompass non-exclusive inclusions, such that a process, method, article or apparatus that comprises a list of elements does not necessarily comprise only those elements in the list, but can include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, an element defined by the phrase "comprising" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0032] Figure 1 Structure diagram of a wind turbine 310 group for some embodiments of the present application; Figure 2 Lightning protection system diagram of a wind turbine blade 300 for some embodiments of the present application; Figure 3 Cross-sectional diagram of a wind turbine blade 300 for some embodiments of the present application; Figure 4 Partial exploded structure diagram of a main beam 305 for some embodiments of the present application.

[0033] As Figure 1As shown, 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 blades 300, generators 310 and towers 320. The wind blades 300 have a high-altitude sharp feature, i.e. high height, located in an open area, and the shape of the wind blades 300 is sharp, making them a good target for lightning discharge. 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 blades 300, insulation breakdown of the generators 310, burning of control components, etc., causing 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 blade 300 to ensure that the lightning current does not cause damage to the wind blades 300 and other parts of the wind turbine 310 group.

[0034] As shown in Figure 2 The wind blade 300 lightning protection system mainly consists of three parts: 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 blade 300 lightning protection system, the lightning arrester 301 is usually installed at the lightning-striking part of the wind blade 300, such as the blade tip or the edge of the wind 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 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 or galvanized steel material and is installed inside the wind blade 300 or at the connection between the wind blade 300 and the tower 320. For example, a metal mesh 304 is provided outside the outer skin 303 of the wind 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, consisting of grounding electrodes, grounding grids and grounding wires. In the wind 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 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] As shown in Figure 3 andFigure 4 As shown 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. 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 is required 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 connected in equipotential through the conductive fabric 307, so that the potentials at different positions of the main beam 305 are equal or differ by a small amount.

[0039] The existing conductive fabric is mostly woven with carbon fiber, but the price of carbon fiber fabric is high, which greatly increases the cost of the lightning protection system, and the penetration 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. carbon-glass mixed fabric, as a conductive fabric to reduce the content of carbon fiber in the fabric and reduce the price of the fabric; the glass fiber yarn in the fabric can also improve the penetration of epoxy resin.

[0040] The existing carbon-glass hybrid fabric is mostly non-crimped fabric (i.e. NFC fabric), which is a non-woven fabric composed of different direction unidirectional layers bound together by stitching or warp-knitted 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 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 complete the 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] Figure 5 A partial weaving structure schematic diagram of the wind power blade 300 conductive fabric 307 provided by some embodiments of the present application is shown, Figure 6 A partial weaving structure schematic diagram of the wind power blade 300 conductive fabric 307 provided by some embodiments of the present application is shown, Figure 5 A cross-sectional view in the direction of A-A.

[0043] As shown in Figure 5 and Figure 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 and 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 braided bundle 100 and the second braided bundle 200 are each formed by winding multiple yarns. The yarns in the first braided bundle 100 and the second braided bundle 200 have different compositions. For example, the yarns in the first braided bundle 100 may include conductive yarns, and the number of yarns may be the same or different. The second braided bundle 200 may be made of a material that facilitates resin penetration.

[0045] Specifically, at least a portion of the multiple first braided bundles 100 include conductive material. That is, along the second direction, all the first braided bundles 100 contain conductive material, or, along the second direction, only a portion of the first braided bundles 100 contain conductive material. The more first braided bundles 100 with conductive material, the better the conductivity of the conductive fabric 307, but the higher the cost. Adjusting the number of first braided bundles 100 with conductive material in the second direction can reduce costs while maintaining conductivity. The inclusion of conductive material in the first braided bundles 100 makes the conductive fabric 307 conductive in both the first and second directions.

[0046] Multiple first braided bundles 100 and multiple second braided bundles 200 are interwoven, meaning that the first braided bundles 100 and second braided bundles 200 are interlaced along the thickness direction, making the conductive fabric 307 conductive in the thickness direction. This ensures that the conductive fabric 307 is conductive in all directions, improving the equipotential bonding efficiency between the pultruded plates and between the pultruded plates and the metal mesh 304 when the conductive fabric 307 is laid between the pultruded plates.

[0047] Among them, such as Figure 6 As shown, along the first direction, each first braided bundle 100 interweaves with multiple second braided bundles 200 to form alternating first interlacing regions 101 and second interlacing regions 102. The second braided bundles 200 in the first interlacing region 101 and the second braided bundles 200 in the second interlacing region 102 are positioned on both sides of the thickness direction of the first braided bundle 100, such that a portion of each first braided bundle 100 is positioned above the second braided bundle 200 and a portion is positioned below the second braided bundle 200. This achieves the purpose of having a conductive material connected between the first surface and the opposite second surface of the conductive fabric 307, thereby achieving conductivity 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, and the like. The material of the second woven bundle 200 can also be nylon fiber, bamboo fiber, hemp fiber, and the like.

[0054] In addition, in other embodiments of the present application, 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. 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 greater 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 A partial weaving structure schematic diagram of the conductive fabric 307 of the wind power blade 300 according to some embodiments of the present application is shown.

[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 along the second direction, 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. 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 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 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 of the second woven fabric.

[0059] Figure 8 Figure 3 shows a schematic view of the local 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 Figure 4 shows a partial enlarged view of C in Figure 5 ; Figure 10 Figure 5 shows a cross-sectional view of B-B in Figure 5 ;

[0062] As shown in Figure 9 and Figure 10 , in some 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 as an example, each of the first interlacing region 101 and the second interlacing region 102 includes four second braided bundles 200, and each of the first overlapping region 103 and the second overlapping region 104 includes two second braided bundles 200. The two second braided bundles 200 are positioned at the same location in the first direction, either below or above the adjacent first braided bundle 100, thus forming an overlapping region. The first overlapping region 103 and the second overlapping region 104 include two second braided bundles 200. This allows the conductive fabric 307 to have a smooth transition in the second direction, improving the surface flatness of the conductive fabric 307 and increasing the contact efficiency between the conductive fabric 307 and the pultruded plate.

[0064] In some optional embodiments of this application, the misalignment direction of the first interlacing regions 101 in adjacent first braided bundles 100 is the same. For example, the first first braided bundle 100 includes adjacent first interlacing regions 101 and second interlacing regions 102, and the first interlacing regions 101 of the second first braided bundle 100 are arranged in a first direction away from the second interlacing regions 102 of the first first braided bundle 100. Similarly, the third first braided bundle 100 is adjacent to the second first braided bundle 100, and the first interlacing regions 101 of the third first braided bundle 100 are arranged in a first direction away from the second interlacing regions 102 of the second first braided bundle 100. This forms an inclined texture on the first or second surface of the conductive fabric 307 to improve the elasticity and strength of the conductive fabric 307. Furthermore, in the first direction, the second braided bundle 200 in the overlapping area can transition between two adjacent first braided bundles 100, thereby improving the resin penetration effect of the conductive fabric 307 during the infusion process.

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

[0066] Furthermore, during the injection process of the wind turbine blade 300, injection ports are spaced apart along the length of the wind turbine blade 300. Therefore, in one embodiment of this application, the first braided bundle 100 of the conductive fabric 307 of the wind turbine blade 300 is laid along the length 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. This allows the second braided bundle 200 to guide the resin radially, thereby improving the resin penetration efficiency.

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

[0068] The wind power blade 300 conductive fabric 307, the main beam 305 and the wind power blade 300 of the embodiment of the present application, a plurality of first woven bundles 100 and a plurality of second woven bundles 200 are interlaced to form a fabric along a first direction and a 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 conductive fabric 307 and the conductor 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 above-described system, module and unit can refer to the corresponding process in the foregoing method embodiment, 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, characterized in that, The conductive fabric comprises: a plurality of first woven bundles (100) extending in a first direction and arranged side by side in a second direction, at least a part of the plurality of first woven bundles (100) comprising conductive material, the first direction and the second direction intersecting; a plurality of second woven bundles (200) extending in the second direction and arranged side by side in the first direction, the plurality of first woven bundles (100) and the plurality of second woven bundles (200) being interwoven with each other; in the first direction, each of the first woven bundles (100) and the plurality of second woven bundles (200) are interwoven to form first staggered areas (101) and second staggered areas (102) arranged alternately, the second woven bundles (200) in the first staggered areas (101) and the second staggered areas (102) are arranged on both sides of the first woven bundles (100) in the thickness direction of the first woven bundles (100), and at least three second woven bundles (200) are included in the first staggered areas (101) and the second staggered areas (102), the area of the first woven bundles (100) with conductive material on the first surface and the area of the first woven bundles (100) with conductive material on the second surface are equal, so that the contact area of the conductive fabric with the upper and lower conductors is equal.

2. The wind turbine blade conductive fabric according to claim 1, characterized in that, The number of the second woven bundles (200) in the first staggered areas (101) and the second staggered areas (102) is equal.

3. The wind turbine blade conductive fabric according to claim 1, wherein, In the second direction, the first staggered areas (101) of adjacent first woven bundles (100) have a first overlapping area (103), and the first overlapping area (103) includes at least two second woven bundles (200); The second overlapping area (104) between the second staggered areas (102) of adjacent first woven bundles (100) includes at least two second woven bundles (200).

4. The wind turbine blade conductive fabric according to claim 1, wherein, The cross-sectional area of the first woven bundles (100) of conductive material is greater than the cross-sectional area of the second woven bundles (200).

5. The wind turbine blade conductive fabric according to claim 1, wherein, A part of the first woven bundles (100) comprises non-conductive material, and the first woven bundles (100) of conductive material and the first woven bundles (100) of non-conductive material are arranged alternately in the second direction.

6. The wind turbine blade conductive fabric according to any of claims 1 to 5, characterized in that, The conductive material of the first woven bundles (100) comprises carbon fibers, and the material of the second woven bundles (200) comprises glass fibers.

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

8. A wind turbine blade spar characterized in that, The wind power blade (300) conductive fabric (307) comprises a pultrusion plate and the wind power blade (300) conductive fabric (307) of any one of claims 1 to 7, the wind power blade (300) conductive fabric (307) is laid between the pultrusion plates for equal potential connection between the pultrusion plates.

9. A wind turbine blade spar according to claim 8, characterised in that The first woven bundles (100) of the wind power blade (300) conductive fabric (307) are laid along the length direction of the main beam (305) of the wind power blade (300).

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

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