Conductive biaxial carbon fiber warp knitting fabric for wind power blade
By using biaxial carbon fiber warp knitted fabric in wind power blades and using interlaced conductive tow components and braided wires to form conductive channels, the problem of insufficient conductivity of traditional carbon fiber pultruded sheets is solved, and efficient electrostatic charge conduction and lightning protection performance is achieved.
Patent Information
- Application Number
- CN202421029218.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-11
AI Technical Summary
Traditional carbon fiber pultruded plates have shortcomings in their electrical conductivity, which leads to the accumulation of static charges during operation of wind power blades, which increases safety hazards such as lightning strikes, and reduces the safety and reliability of wind power blades.
A biaxial carbon fiber warp knitted fabric with wind power blades is used to form interlaced conductive channels through at least two layers of conductive tow assemblies and interlaced braided wires, ensuring that the fabric has good conductivity in any direction.
It achieves excellent mechanical properties and conductive properties, can effectively conduct static charges, improve the lightning protection performance of wind power blades, and has good durability and stability. It is suitable for wind power blade manufacturing in various complex environments.
Smart Images
Figure CN222908238U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind turbine blade manufacturing, in particular to a biaxial carbon fiber warp knitted fabric for conducting electricity of a wind turbine blade. Background Art
[0002] As a key component of a wind turbine, the performance of a wind turbine blade directly affects the efficiency and reliability of the wind turbine. In order to improve the strength and stiffness of the blade, a reinforcing structure is usually adopted in the blade structure. Among them, a carbon fiber pultruded plate is a commonly used reinforcing structure. The carbon fiber pultruded plate has excellent mechanical properties and can effectively enhance the structure of the blade and improve its ability to withstand external loads.
[0003] However, traditional carbon fiber pultruded plates have deficiencies in electrical conductivity. Since the blade may accumulate static charges during operation, if these static charges cannot be effectively conducted away, it is easy to cause safety hazards such as lightning strikes under harsh weather conditions, reducing the safety and reliability of the wind turbine blade.
[0004] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present utility model, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model
[0005] The utility model provides a biaxial carbon fiber warp knitted fabric for conducting electricity of a wind turbine blade, thus effectively solving the problems in the background art.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: a biaxial carbon fiber warp knitted fabric for conducting electricity of a wind turbine blade, including: at least two upper and lower layers of staggered conductive wire bundle assemblies and knitting threads used for binding the conductive wire bundle assemblies;
[0007] Each group of the conductive wire bundle assemblies includes a plurality of conductive wire bundles laid side by side, or each group of the conductive wire bundle assemblies includes a plurality of conductive wire bundles laid side by side and spaced apart and glass fiber bundles; and the conductive wire bundles are knitted, or the glass fiber bundles are provided with an angle a with the knitting direction;
[0008] The coil structure formed by the knitting threads is used to bundle the two conductive wire bundles in the thickness direction;
[0009] Staggered conductive channels are formed between the upper and lower layers of the conductive wire bundles.
[0010] Further, the conductive wire bundle is formed by bundling a plurality of carbon fiber filaments.
[0011] Further, the two groups of the conductive wire bundle assemblies are symmetrically arranged along the knitting direction.
[0012] Further, the angle a is 30° to 60°.
[0013] Further, the angle a is 45°.
[0014] Further, polyester threads for bundling are radially provided on the conductive wire bundles, and the model of the polyester threads is 30D to 150D.
[0015] Further, the coil structure is a uniform binding structure formed by the braided thread between the conductive wire bundles.
[0016] Further, the areal density of each group of the conductive wire bundles is 75 g / m² to 300 g / m².
[0017] Further, the areal density of the braided thread is 4 g / m² to 10 g / m².
[0018] The beneficial effects of the present utility model are as follows: The present utility model is woven by at least two layers of conductive wire bundle assemblies arranged in a staggered manner up and down and a braided thread interwoven between the two layers of conductive wire bundle assemblies. Staggered conductive channels are formed between the upper and lower layers of conductive wire bundles, enabling the fabric to have good conductive performance in any direction, achieving excellent mechanical properties and conductive performance. During the manufacturing process of wind turbine blades, the fabric can effectively conduct away static charges, improve the lightning protection performance of wind turbine blades, and at the same time has good durability and stability, and is suitable for the manufacturing of wind turbine blades in various complex environments. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 It is a schematic structural diagram of a biaxial carbon fiber warp knitted fabric for conducting electricity in a wind turbine blade in Embodiment 1;
[0021] Figure 2 It is a front view of a biaxial carbon fiber warp knitted fabric for conducting electricity in a wind turbine blade in Embodiment 1;
[0022] Figure 3 It is a schematic structural diagram of a conductive wire bundle in Embodiment 1;
[0023] Figure 4 It is a schematic structural diagram of a biaxial carbon fiber warp knitted fabric for conducting electricity in a wind turbine blade in Embodiment 2.
[0024] Reference numerals: 1, conductive wire bundle assembly; 11, conductive wire bundle; 111, carbon fiber monofilament; 12, glass fiber bundle; 2, braided wire; 3, braided crochet hook. Detailed implementation mode
[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0027] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0028] Embodiment 1:
[0029] As Figures 1 to 3 shown: A biaxial carbon fiber warp knitted fabric for conducting electricity in a wind turbine blade includes: at least two upper and lower layers of conductive wire bundle assemblies 1 arranged alternately and a braided wire 2 used to bind the conductive wire bundle assemblies 1;
[0030] Each group of conductive wire bundle assemblies 1 includes a plurality of conductive wire bundles 11 laid side by side, or each group of conductive wire bundle assemblies 1 includes a plurality of conductive wire bundles 11 laid side by side and spaced apart and glass fiber bundles 12; and an angle a is provided between the conductive wire bundles 11 and the weaving direction or between the glass fiber bundles 12 and the weaving direction;
[0031] The coil structure formed by the braided wire 2 is used to bundle two conductive wire bundles 11 in the thickness direction;
[0032] An interleaved conductive channel is formed between the upper and lower conductive wire bundles 11, enabling the fabric to have good electrical conductivity in any direction, achieving excellent mechanical and electrical conductivity. During the manufacturing process of wind turbine blades, this fabric can effectively conduct static charges away, improving the lightning protection performance of wind turbine blades. At the same time, it has good durability and stability and is suitable for the manufacturing of wind turbine blades in various complex environments.
[0033] Specifically, as Figure 1 shown, it includes two sets of conductive wire bundle assemblies 1 arranged one above the other. Each set of conductive wire bundle assemblies 1 includes a plurality of conductive wire bundles 11 laid side by side, and the conductive wire bundles 11 inside the upper conductive wire bundle assembly 1 and the conductive wire bundles 11 inside the lower conductive wire bundle assembly 1 are arranged in an interleaved manner. The knitting crochet hook 3 of the device drives the knitting thread 2 to move, tying the upper and lower conductive wire bundles 11 together, thereby knitting the upper and lower conductive wire bundle assemblies 1 into a whole, and thus forming an interleaved conductive channel between the conductive wire bundles 11. This fabric can be woven from 12K, 24K, 25K, or 50K carbon fibers, improving the electrical conductivity and overall strength of the wind turbine blade.
[0034] As Figure 3 shown, in one embodiment of the conductive wire bundle 11, the conductive wire bundle 11 is composed of a plurality of carbon fiber filaments 111 bundled together; on the one hand, bundling a plurality of carbon fiber filaments 111 together to form the conductive wire bundle 11 increases the number and surface area of the conductive channels, helps improve the electrical conductivity, makes it easier for static charges to be conducted away, and reduces the occurrence probability of safety hazards such as lightning strikes; on the other hand, bundling a plurality of carbon fiber filaments 111 together can increase the strength and stiffness of the conductive wire bundle 11.
[0035] As a preference of the above embodiment, the two sets of conductive wire bundle assemblies 1 are symmetrically arranged along the knitting direction. Specifically, the symmetrical arrangement can enhance the structural stability of the carbon fiber pultruded plate, reduce the possibility of deformation or damage caused by uneven arrangement of the conductive wire bundle assemblies 1, and improve the reliability and service life of the blade.
[0036] In this embodiment, as Figure 2 shown, the angle a is 30° to 60°. Specifically, it can optimize the conduction path, improve the electrical conductivity, make it easier for static charges to be conducted away, and reduce the occurrence probability of safety hazards such as lightning strikes; the appropriate angle setting can enhance the structural strength and stiffness of the carbon fiber pultruded plate, help the blade maintain stability under the action of wind force, and improve the overall performance.
[0037] As a preference of the above embodiment, the angle a is 45°. Specifically, setting the angle a to 45° can achieve a balance between electrical conductivity and structural strength. The angle can provide good electrical conductivity while maintaining sufficient structural strength, helping to improve the overall performance and reliability of the blade.
[0038] Among them, the conductive wire bundle 11 is radially provided with polyester threads for bundling, and the model of the polyester thread is selected between 30D and 150D specifications. Specifically, on the one hand, as a bundling material, the polyester thread can enhance the structural stability of the conductive wire bundle 11, prevent it from loosening or deforming during use, and improve the overall reliability of the carbon fiber pultruded plate; on the other hand, the polyester thread is a lightweight material, and using a thinner polyester thread can reduce the extra weight, contribute to reducing the overall weight of the blade, and improve the wind energy utilization efficiency.
[0039] As a preference of the above embodiment, the coil structure is that the braided wire 2 forms a uniform binding structure between the conductive wire bundles 11. Specifically, the uniform binding can form a uniform bundling coil of the braided wire 2 between the conductive wire bundles 11, ensuring the uniformity of the conductive wire bundles 11, thereby improving the connectivity and stability between the conductive wire bundles 11. While bundling the conductive wire bundles 11 together, the mesh structure also increases the overall strength of the carbon fiber pultruded plate, making it more capable of withstanding external loads and vibrations.
[0040] In this embodiment, the areal density of each group of conductive wire bundles 11 is 75 g / m² to 300 g / m². On the one hand, by controlling the areal density of the conductive wire bundles 11, the number and density of conductive channels can be adjusted, thereby optimizing the conductive performance. A higher areal density can provide more conductive channels, improve the conductive performance, contribute to effectively conducting away static charges, and reducing safety risks such as lightning strikes; on the other hand, by reasonably controlling the areal density, the material cost of the conductive wire bundles 11 can be reduced, and it also helps to simplify the manufacturing process, improve production efficiency, and thus reduce the manufacturing cost.
[0041] Among them, the areal density of the braided wire 2 is 4 g / m² to 10 g / m². On the one hand, the low areal density of the braided wire 2 means less material is used for braiding, so the overall weight of the blade can be reduced, contributing to improving the wind energy utilization efficiency.
[0042] Specifically, the conductive wire bundle 11 is bundled by carbon fiber monofilaments 111, and taking the angle a between the conductive wire bundle 11 and the weaving direction as 45° as an example; and when implementing this patent, the following steps can be adopted:
[0043] 1) Prepare carbon fiber yarn raw materials to ensure that the quality and performance of the carbon fiber meet the performance and process requirements;
[0044] 2) Weave the weft of two layers of cross - staggered carbon fiber monofilaments 111 at +45° and -45°, and bind them with polyester threads to form the basic structure of the warp knitted fabric;
[0045] 3) During the weaving process, adjust the conductive performance and process performance of the fabric by controlling the weaving density of the conductive wire bundle 11 and the tension of the braided wire 2;
[0046] 4) After the weaving is completed, the fabric can be subjected to processes such as splitting and cutting to make it match the size required for actual use;
[0047] 5) Apply the obtained biaxial carbon fiber woven fabric to the manufacturing process of the carbon fiber pultruded plate of the wind turbine blade to improve the electrical conductivity and lightning protection performance of the wind turbine blade.
[0048] Example 2:
[0049] As Figure 4 shown, different from Example 1, each conductive wire bundle assembly 1 includes a plurality of conductive wire bundles 11 and glass fiber bundles 12 that are arranged side by side and at intervals; and an angle a is provided between the conductive wire bundle 11 and the weaving direction, or between the glass fiber bundle 12 and the weaving direction; static charges can also be effectively conducted away, improving the lightning protection performance of the wind turbine blade, and at the same time having good durability and stability, suitable for the manufacture of wind turbine blades in various complex environments;
[0050] Using glass fiber bundles 12 to replace some of the conductive wire bundles 11, on the one hand, since the conductive wire bundles 11 are relatively expensive, the cost can be reduced and the economic benefits can be improved; on the other hand, the addition of glass fiber can increase the toughness and tensile strength of the conductive wire bundle assembly 1, which helps to improve the overall mechanical properties of the carbon fiber pultruded plate and enables it to better withstand external loads and vibrations.
[0051] The spaced arrangement of the conductive wire bundles 11 and the glass fiber bundles 12, in addition to as Figure 4 shown, with one glass fiber bundle 12 arranged at intervals of one conductive wire bundle 11, one glass fiber bundle 12 can also be arranged at intervals of other numbers of conductive wire bundles 11, and the number of intervals is set according to the on-site requirements, all within the protection scope of this application.
[0052] Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The protection scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A conductive biaxial carbon fiber warp knitted fabric for wind turbine blades, characterized in that: It comprises at least two layers of staggered conductive wire bundle assemblies and a braided wire used to bind the conductive wire bundle assemblies; Each group of the conductive filament bundle components includes a plurality of conductive filament bundles laid in parallel, or each group of the conductive filament bundle components includes a plurality of conductive filament bundles and glass fiber bundles laid in parallel and at intervals, and at least one bundle of the glass fiber bundle is arranged for every bundle of the conductive filament bundles; and an angle a is formed between the conductive filament bundles and the weaving direction, or between the glass fiber bundles and the weaving direction; The coil structure formed by the braided wire is used to bundle the two conductive wire bundles in the thickness direction; Interlaced conductive channels are formed between the upper and lower layers of conductive filament bundles; The conductive filament bundle is formed by bundling a plurality of carbon fiber filaments.
2. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 1, characterized in that: The two groups of conductive thread bundle assemblies are symmetrically arranged along the weaving direction.
3. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 1, characterized in that: The angle a is 30° to 60°.
4. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 3, characterized in that: The angle a is 45°.
5. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 1, characterized in that: The conductive filament bundle is radially provided with polyester threads for bundling, and the model of the polyester threads is 30D to 150D.
6. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 1, characterized in that: The coil structure is a uniform binding structure formed by the braided wires between the conductive wire bundles.
7. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 1, characterized in that: The surface density of each group of conductive filament bundles is 75g / m²~300g / m².
8. The conductive biaxial carbon fiber warp knitted fabric for wind turbine blades according to claim 1, characterized in that: The surface density of the braided wire is 4g / m²~10g / m².