Wind driven generator blade lightning protection metal net and manufacturing method thereof

Abstract

The invention provides a wind driven generator blade lightning protection metal net and a manufacturing method thereof, and relates to the technical field of wind driven generator blade disaster prevention. The lightning protection metal net is laid at the blade tip position of the blade of the wind driven generator, compared with a blade tip lightning arrester which is only arranged at the blade tip of the blade, the lightning protection metal net can be laid on the blade in a larger area, the protection range of the blade is larger, and therefore the protection capacity of the blade of the wind driven generator can be improved. Meanwhile, the lightning protection metal net is connected with the grounding down lead through the blade body lightning arrester and the blade tip lightning arrester, when the wind driven generator blade is struck by lightning, lightning current is led to the ground through the lightning protection metal net, the laying area of the lightning protection metal net is large, and large lightning current can be conducted. The internal structure of the blade is prevented from being damaged due to overlarge current in the process of conducting lightning current through a metal conductor in the blade, so that the blade is prevented from being damaged, and the lightning protection capability of a lightning protection metal net is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind turbine blade disaster prevention, and in particular to a wind turbine blade lightning protection metal mesh and a manufacturing method thereof. Background Art

[0002] With the rapid development of wind power technology, the capacity of wind turbines continues to increase, and blades are becoming longer and longer. Since wind turbines are typically installed in high, open locations, they are highly susceptible to lightning strikes. Lightning strikes can severely damage wind turbine blades, potentially causing surface damage such as ablation, perforation, and cracks. This not only affects the blades' aerodynamic performance but also significantly reduces their service life, increasing maintenance costs and downtime. In severe cases, it can even lead to safety incidents.

[0003] Currently, common lightning protection measures for wind turbine blades primarily involve installing lightning receptors at the blade tip and directing the lightning current to the ground through internal metal conductors. However, these methods have numerous shortcomings. For example, lightning receptors only protect the area near the blade tip, providing limited protection for the blade. The internal metal conductors can heat up during the conduction of lightning current due to excessive current flow, potentially damaging the blade's internal structure. Furthermore, traditional lightning protection measures struggle to cope with complex and changing lightning strike scenarios, failing to fully and effectively protect the blades.

[0004] Therefore, how to solve the above problems has become one of the technical problems that need to be solved urgently at this stage. Summary of the Invention

[0005] In order to solve the above technical problems, the present disclosure provides a lightning protection metal mesh for wind turbine blades and a manufacturing method thereof.

[0006] In a first aspect, the present disclosure provides a lightning protection metal mesh for a wind turbine blade, wherein the lightning protection metal mesh is at least laid at the tip of the wind turbine blade;

[0007] The wind turbine includes a blade tip lightning rod, a blade body lightning rod and a ground down conductor. The blade tip lightning rod and the blade body lightning rod are both connected to the ground down conductor. The lightning protection metal mesh is connected to the ground down conductor through the blade tip lightning rod and the blade body lightning rod.

[0008] Optionally, where:

[0009] The lightning protection metal mesh includes a plurality of cross-arranged metal wires, the width of the metal wires along a first direction is W, and the first direction is parallel to the plane where the lightning protection metal mesh is located and perpendicular to the extension direction of the metal wires;

[0010] W=A / H,

[0011] Wherein, A represents the flow conduction area of the metal wire,

[0012]

[0013] I peak Indicates the lightning current withstand of the metal wire, J max represents the maximum lightning current withstand density of the metal wire, and n represents the safety factor;

[0014] H represents the thickness of the lightning protection metal mesh along the second direction, and the second direction is perpendicular to the plane where the lightning protection metal mesh is located.

[0015] Optionally, where:

[0016] The thickness of the lightning protection metal mesh along the second direction is H, and the second direction is perpendicular to the plane where the lightning protection metal mesh is located, and 0.1 mm≤H≤1 mm.

[0017] Optionally, where:

[0018] The lightning protection metal mesh includes a plurality of cross-arranged metal wires, the width of the metal wires along a first direction is W, the first direction is parallel to the plane where the lightning protection metal mesh is located and perpendicular to the extension direction of the metal wires, and W is greater than or equal to 0.26 mm.

[0019] Optionally, where:

[0020] The lightning protection metal mesh includes a plurality of cross-arranged metal wires;

[0021] The mesh formed by the intersection of the metal wires is in the shape of a square or a rhombus, and the side length of the mesh is a;

[0022]

[0023] Wherein, ρ represents the resistivity of the metal wire, I max It represents the maximum withstand lightning current of the wind turbine, J cr represents the critical current density of the metal wire, S f Indicates the safety factor.

[0024] Optionally, where:

[0025] The lightning protection metal mesh includes a plurality of cross-arranged metal wires, the mesh shape formed by the cross-arranged metal wires is square or diamond-shaped, and the side length of the mesh is a, 2mm≤a≤5mm.

[0026] Optionally, where:

[0027] The laying length of the lightning protection metal mesh along the extension direction of the blades of the wind turbine is L, the length of the blades of the wind turbine is L0, and L≥10%×L0.

[0028] Optionally, where:

[0029] The material of the lightning protection metal mesh is copper-nickel alloy.

[0030] Optionally, where:

[0031] The raw materials of the lightning protection metal mesh include at least copper, nickel, iron and manganese, wherein the mass ratio of copper in the raw materials is 68% to 70%, the mass ratio of nickel is 28% to 30%, the mass ratio of iron is 0.5% to 1%, and the mass ratio of manganese is 0.5% to 1%.

[0032] In a second aspect, based on the same inventive concept, the present disclosure provides a method for manufacturing a lightning protection metal mesh for a wind turbine blade, comprising:

[0033] Melting: After mixing the raw materials in a preset ratio, vacuum melting is carried out in a preset vacuum environment to generate alloy materials;

[0034] Hot pressing: hot pressing the alloy material to a first preset thickness at a first temperature;

[0035] Cold pressing: cooling the hot-pressed alloy material, and forging the alloy material to a second preset thickness at a second temperature, wherein the second temperature is lower than the first temperature;

[0036] Pickling: Pickling and anti-oxidation treatment are performed on the cold-pressed alloy material, and epoxy resin is coated;

[0037] Stamping: The alloy material is stamped to form a lightning protection metal mesh.

[0038] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0039] The present disclosure provides a lightning protection metal mesh for wind turbine blades and a method for manufacturing the same. The lightning protection metal mesh is applied to the blade tips of the wind turbine blades. Compared to providing a tip lightning receptor only at the blade tips, the lightning protection metal mesh can be applied to a larger area of the blades, providing a wider protection range for the blades, thereby facilitating improved protection of the wind turbine blades. Furthermore, the wind turbine of the present disclosure includes a blade body lightning receptor and a blade tip lightning receptor. The lightning protection metal mesh is connected to a grounding down conductor via the blade body lightning receptor and the blade tip lightning receptor. When the wind turbine blades are struck by lightning, the lightning current is directed to the ground via the lightning protection metal mesh. The lightning protection metal mesh has a larger application area and can conduct a larger lightning current, thereby facilitating the avoidance of damage to the internal structure of the blades due to excessive current during the conduction of lightning current through the metal conductors inside the blades. This helps prevent damage to the blades, thereby facilitating improved lightning protection of the lightning protection metal mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0041] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 The figure shows a schematic diagram of an arrangement of a lightning protection metal mesh for a wind turbine blade provided by an embodiment of the present disclosure;

[0043] Figure 2 The figure shows a schematic diagram of the connection of the lightning protection metal mesh for wind turbine blades provided by an embodiment of the present disclosure;

[0044] Figure 3 The figure shows a regional plan view of a lightning protection metal mesh for a wind turbine blade provided by an embodiment of the present disclosure;

[0045] Figure 4 Shown along Figure 3 A schematic cross-sectional view of BB';

[0046] Figure 5 The figure shows a flow chart of a method for manufacturing a lightning protection metal mesh provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0049] During their research, the inventors discovered that the blades of wind turbines are susceptible to lightning strikes. In related technologies, lightning rods are installed at the tips of the blades to direct lightning current to the ground through the metal conductors inside the blades. However, this method can only protect the tip area of the blades and has limited protective effect on the blades. At the same time, the internal metal conductors may generate heat due to excessive current during the process of conducting lightning current, causing damage to the internal structure of the blades and failing to effectively protect the blades.

[0050] In view of this, the present disclosure provides a lightning protection metal mesh for a wind turbine blade and a manufacturing method thereof, so as to enhance the lightning protection capability of the wind turbine blade.

[0051] Figure 1 The figure shows a layout diagram of a lightning protection metal mesh for a wind turbine blade provided by an embodiment of the present disclosure. Figure 2 The figure shows a schematic diagram of the connection of the lightning protection metal mesh of the wind turbine blade provided by the embodiment of the present disclosure. Figure 3 The figure shows a schematic diagram of a region of a lightning protection metal mesh for a wind turbine blade provided by an embodiment of the present disclosure. Figures 1 to 4 The present disclosure provides a lightning protection metal mesh 40 for wind turbine blades, which is laid at least at the tip position of the blades of the wind turbine; the wind turbine includes a blade tip lightning receptor 10, a blade body lightning receptor and a grounding down conductor, the blade tip lightning receptor 10 and the blade body lightning receptor are both connected to the grounding down conductor, and the lightning protection metal mesh 40 is connected to the grounding down conductor through the blade tip lightning receptor 10 and the blade body lightning receptor.

[0052] It should be noted that the specific location of the blade body lightning receptor is not shown in the drawings of this disclosure. Optionally, the blade body lightning receptor can be arranged in conjunction with the blade tip lightning receptor 10 at the blade body area such as the leading edge 21 and the trailing edge 22 of the blade. The drawings of this disclosure do not show the grounding down conductor, which is used to introduce lightning current into the ground. Figure 1 The figure shows the grounding area 30 of the lightning protection metal mesh 40. Figure 2The figure shows a method of connecting a lightning protection metal mesh 40 to a ground down conductor through a blade tip lightning receptor 10. Specifically, a metal sheet 50 with a length of 300 mm to 500 mm, a width of 300 mm to 500 mm, and a thickness of 5 mm to 10 mm is placed on one side of the blade tip lightning receptor 10. The starting position 11 of the blade tip lightning receptor 10 is located on the symmetry axis of the metal sheet 50. The material of the metal sheet 50 can be a copper-nickel alloy. Four holes with a diameter of 20 mm are drilled around the metal sheet 50 at a distance of 10 mm from the edge, and copper fully threaded M6*20 hexagon socket countersunk screws 60 (a single screw has a lightning current carrying capacity of more than 200 kA) are installed and tightened to make it close to the metal sheet 50. The metal mesh 40 is electrically connected to the soft copper cable 70 through the blade tip lightning receptor 10 and the metal mesh 50, thereby introducing lightning current into the ground.

[0053] Specifically, the present disclosure provides a lightning protection metal mesh 40 for wind turbine blades. The lightning protection metal mesh 40 is applied to the surface of a wind turbine blade. For example, the lightning protection metal mesh 40 is applied starting at the blade tip and extending along the blade's extension direction. Compared to installing a tip lightning receptor 10 only at the blade tip, the lightning protection metal mesh 40 can be applied to a larger blade area, providing a wider protection range for the blade, thereby improving the protection capability of the wind turbine blade. At the same time, in this embodiment, the wind turbine includes a blade body lightning rod and a blade tip lightning rod 10, and the lightning protection metal mesh 40 is connected to the grounding down conductor through the blade body lightning rod and the blade tip lightning rod 10. When the wind turbine blade is struck by lightning, the lightning current is led to the ground through the lightning protection metal mesh 40. The laying area of the lightning protection metal mesh 40 is large and can conduct a large lightning current, which is beneficial to avoid damage to the internal structure of the blade due to excessive current during the conduction of lightning current through the metal conductor inside the blade, thereby preventing damage to the blade, and therefore, it is beneficial to improve the lightning protection capability of the lightning protection metal mesh 40.

[0054] It should be noted that the “lightning protection capability” mentioned in the present disclosure refers to preventing the blades of a wind turbine generator set from being damaged by lightning or reducing the damage, and does not mean that the blades will not be struck by lightning.

[0055] Figure 4 Shown along Figure 3 A cross-sectional diagram of BB', please refer to Figures 1 to 4 In an optional embodiment of the present disclosure, the lightning protection metal mesh 40 includes a plurality of cross-arranged metal wires 41. The width of the metal wires 41 along the first direction F1 is W. The first direction F1 is parallel to the plane where the lightning protection metal mesh 40 is located and perpendicular to the extension direction of the metal wires 41; W = A / H.

[0056] Wherein, A represents the flow conducting area of the metal wire 41,

[0057]

[0058] I peak represents the lightning current withstand of the metal wire 41, J max represents the maximum lightning current withstand density of the metal wire 41, and n represents the safety factor.

[0059] H represents the thickness of the lightning protection metal mesh 40 along the second direction F2 , and the second direction F2 is perpendicular to the plane where the lightning protection metal mesh 40 is located.

[0060] Specifically, the lightning protection metal mesh 40 provided in the embodiment of the present disclosure is a mesh structure formed by a plurality of metal wires 41 intersecting each other. In order to improve the lightning protection capability of the lightning protection metal mesh 40, the embodiment of the present disclosure sets the width W of the metal wires 41. According to the lightning current withstand of the lightning protection metal mesh 40, the maximum lightning current withstand density of the metal wires 41, and the safety factor, the conduction area A of the metal wires 41 can be calculated. According to the conduction area A of the metal wires 41 and the thickness H of the lightning protection metal mesh 40, the width W of the metal wires 41 can be calculated. Optionally, the maximum lightning current withstand density J of the metal wires 41 can be calculated. max The maximum lightning current withstand density J is determined by the material properties of the metal wire 41. max 5×10 11 A / m 2 The copper-nickel alloy is used as the material of the metal wire 41, the safety factor n is selected as 1.5, according to the lightning protection capability of the wind turbine blade of 200kA, the thickness H of the lightning protection metal mesh 40 is calculated to be 0.1~0.15mm, and the width W of the metal wire 41 along the first direction F1 is set to 0.26mm≤W≤0.39mm.

[0061] In an optional embodiment of the present disclosure, the width W of the metal wire 41 along the first direction F1 is ≥ 0.26 mm. Specifically, when the width W of the metal wire 41 along the first direction F1 is less than 0.26 mm, when the wind turbine blade is struck by lightning, the width of the metal wire 41 is too small and its ability to carry the lightning current is weak. Therefore, the present disclosure sets the width W of the metal wire 41 along the first direction F1 to W ≥ 0.26 mm, which is more conducive to improving the lightning protection capability of the lightning protection metal mesh 40. The present disclosure provides an optional embodiment in which the width W of the metal wire 41 along the first direction F1 is 0.3 mm; the present disclosure provides another optional embodiment in which the width W of the metal wire 41 along the first direction F1 is 0.35 mm; the present disclosure provides yet another optional embodiment in which the width W of the metal wire 41 along the first direction F1 is set to 0.26 mm ≤ W ≤ 0.39 mm.

[0062] Regarding the thickness H of the lightning protection metal mesh 40 , optionally, the thickness H of the lightning protection metal mesh 40 along the second direction F2 is set to 0.1 mm≤H≤1 mm.

[0063] Specifically, when the thickness H of the lightning protection metal mesh 40 along the second direction F2 is less than 0.1 mm, the thickness H of the lightning protection metal mesh 40 is relatively thin. When the wind turbine blade is struck by lightning, the lightning protection metal mesh 40 has a weak ability to carry the lightning current, which may cause the lightning protection metal mesh 40 to melt and seriously damage the blade. When the thickness H of the lightning protection metal mesh 40 is greater than 1 mm, the thickness H of the lightning protection metal mesh 40 is relatively thick, which may lead to material waste and increase production costs. At the same time, it may also affect the aerodynamic layout of the wind turbine blade. Therefore, the present disclosure sets the thickness H of the lightning protection metal mesh 40 along the second direction F2 to 0.1 mm ≤ H ≤ 1 mm. This is more conducive to improving the lightning protection capability of the lightning protection metal mesh 40 and effectively protecting the wind turbine blade. The present disclosure provides an optional implementation manner in which the thickness of the lightning protection metal mesh 40 along the second direction F2 is H=0.2mm; the present disclosure provides another optional implementation manner in which the thickness of the lightning protection metal mesh 40 along the second direction F2 is H=0.25mm; the present disclosure provides yet another optional implementation manner in which the thickness of the lightning protection metal mesh 40 along the second direction F2 is H=0.18mm; the present disclosure provides yet another optional implementation manner in which the thickness of the lightning protection metal mesh 40 along the second direction F2 is 0.1mm≤H≤0.15mm.

[0064] Please refer to Figure 1 and Figure 3 In an optional embodiment of the present disclosure, the lightning protection metal mesh 40 includes a plurality of cross-arranged metal wires 41; the mesh shape formed by the cross-arranged metal wires 41 is square or diamond-shaped, and the side length of the mesh is a;

[0065]

[0066] Wherein, ρ represents the resistivity of the metal wire 41, I max Indicates the maximum withstand lightning current of the wind turbine, J cr represents the critical current density of the metal wire 41, S f Indicates the safety factor.

[0067] Specifically, in the embodiment of the present disclosure, the mesh shape of the lightning protection metal mesh 40 with a mesh structure is square or diamond, and the side lengths of the mesh are equal. Then, the resistance of the lightning protection metal mesh 40 in all directions is consistent, which is conducive to the stable and uniform extraction of lightning current, and prevents excessive current flowing through a certain area of the lightning protection metal mesh 40, causing damage to the lightning protection metal mesh 40 or the wind turbine blades. At the same time, this embodiment also sets the side length of the mesh to prevent the side length of the mesh from being too large, resulting in insufficient current-carrying area and poor lightning protection effect. For example, a metal wire 41 made of copper-nickel alloy is used to make the lightning protection metal mesh 40, and the resistivity ρ of the metal wire 41 is approximately 4.5×10 -7 Ω·m, the maximum withstand lightning current I of the wind turbine maxSet to 200kA, the critical current density J of the copper-nickel alloy wire 41 is cr 1.2×10 11 A / m 2 , safety factor S f If it is set to 1.5-2.0, it can be calculated that the side length a of the 40 mesh of the lightning protection metal mesh is 0.4mm~0.5mm.

[0068] Please continue to refer to Figure 1 and Figure 3 In an optional embodiment of the present disclosure, the lightning protection metal mesh 40 includes a plurality of cross-arranged metal wires 41, the mesh shape formed by the cross-arranged metal wires 41 is square or diamond-shaped, and the side length of the mesh is a, 2mm≤a≤5mm.

[0069] Specifically, when the side length a of the mesh is less than 2 mm, although the side length of the lightning protection metal mesh 40 is small, which is beneficial to improving the lightning protection effect of the lightning protection metal mesh 40, it will consume more manufacturing materials and increase the manufacturing cost. When the side length a of the mesh is greater than 5 mm, the current-carrying area of the lightning protection metal mesh 40 is insufficient, and the lightning protection effect is poor. Therefore, the present disclosure sets the side length a of the mesh of the lightning protection metal mesh 40 to 2 mm ≤ a ≤ 5 mm. This is beneficial to improving the lightning protection effect of the lightning protection metal mesh 40 while also saving the manufacturing cost of the lightning protection metal mesh 40. The present disclosure provides an optional embodiment in which the side length a of the mesh is 3 mm; the present disclosure provides another optional embodiment in which the side length a of the mesh is 4 mm; the present disclosure provides another optional embodiment in which the side length of the mesh is 2.5 mm ≤ a ≤ 3.5 mm.

[0070] Please refer to Figure 1 Optionally, the laying length of the lightning protection metal mesh 40 along the extension direction of the blades of the wind turbine is L, the length of the blades of the wind turbine is L0, and L≥10%×L0.

[0071] Specifically, when the laying length L of the lightning protection metal mesh 40 along the extension direction of the wind turbine blades is less than 10% × L0, the laying length L of the lightning protection metal mesh 40 is too small, which is not conducive to effectively protecting the wind turbine blades; therefore, in the embodiment of the present disclosure, the laying length L of the lightning protection metal mesh 40 along the extension direction of the wind turbine blades is set to be greater than or equal to 10% × L0. In this way, the area of the lightning protection metal mesh 40 is larger, which is conducive to more effective protection of the wind turbine blades, thereby improving the lightning protection capability. The present disclosure provides an optional embodiment in which L = 20% × L0; the present disclosure provides another optional embodiment in which L = 30% × L0; and the present disclosure provides yet another optional embodiment in which L ≥ 25% × L0.

[0072] Please refer to Figure 1 and Figure 3In an optional embodiment of the present disclosure, the lightning protection metal mesh 40 is made of a copper-nickel alloy. It should be noted that copper-nickel alloy has advantages such as a high melting point and strong corrosion resistance. The lightning protection metal mesh 40 is applied to the surface of the blades. Wind turbine blades are typically located in a relatively harsh environment. Using a copper-nickel alloy lightning protection metal mesh 40 is beneficial for improving the lightning protection metal mesh 40's radiation resistance. At the same time, when the wind turbine is struck by lightning, the copper-nickel alloy lightning protection metal mesh 40 has a high melting point and a good lightning current carrying capacity, making it less likely to melt. This helps improve the lightning protection capability of the lightning protection metal mesh 40 and effectively protects the wind turbine blades.

[0073] Please continue to refer to Figure 1 and Figure 3 To further improve the performance of the lightning protection metal mesh 40, in an optional embodiment of the present disclosure, the raw materials of the lightning protection metal mesh 40 include at least copper, nickel, iron, and manganese, with the mass ratio of copper being 68% to 70%, the mass ratio of nickel being 28% to 30%, the mass ratio of iron being 0.5% to 1%, and the mass ratio of manganese being 0.5% to 1%. For example, the raw materials of the lightning protection metal mesh 40 include copper, nickel, iron, and manganese, with the mass ratio of copper being 69%, the mass ratio of nickel being 30%, the mass ratio of iron being 0.5%, and the mass ratio of manganese being 0.5%. It should be noted that this disclosure is merely illustrative and is not intended to be limiting.

[0074] Based on the same inventive concept, the present disclosure provides a method for manufacturing a lightning protection metal mesh for a wind turbine blade. Figure 5 The figure shows a flow chart of a method for manufacturing a lightning protection metal mesh according to an embodiment of the present disclosure. Figure 1 and Figure 5 , the production method of lightning protection metal mesh includes:

[0075] Step S10, melting: mixing the raw materials according to a preset ratio, and performing vacuum melting in a preset vacuum environment to generate an alloy material;

[0076] Step S20, hot pressing: hot pressing the alloy material to a first preset thickness at a first temperature;

[0077] Step S30, cold pressing: cooling the hot-pressed alloy material, and forging the alloy material to a second preset thickness at a second temperature, where the second temperature is lower than the first temperature;

[0078] Step S40, pickling: pickling and anti-oxidation treatment are performed on the cold-pressed alloy material, and epoxy resin is coated;

[0079] Step S50 , stamping: stamping the alloy material to form the lightning protection metal mesh 40 .

[0080] Specifically, an embodiment of the present disclosure provides a method for manufacturing a lightning protection metal mesh 40 for a wind turbine blade, wherein the lightning protection metal mesh 40 for a wind turbine blade is manufactured through smelting, hot pressing, cold pressing, pickling and stamping.

[0081] In step S10, the raw materials for the lightning protection metal mesh 40 are placed in a vacuum chamber at a preset vacuum level of less than or equal to 1×10 -3 Pa environment, a vacuum melting furnace is used for melting, the melting temperature is 1450℃~1500℃, the melting time is 30 minutes~60 minutes, and after melting, the temperature is kept at 750℃~850℃ for 4 hours~6 hours. For example, the preset vacuum degree is 1×10 - 3 Pa, the melting temperature is 1480℃, the melting time is 45 minutes, and after melting, it is kept at 800℃ for 5 hours.

[0082] In step S20, the alloy material cooled in step S10 is heated to a first temperature of 1000°C to 1100°C and held at that temperature for 2 to 3 hours. The alloy material is then hot-rolled to a first predetermined thickness of 8 mm to 12 mm using a hot rolling mill. After hot pressing, the alloy material is held at 700°C to 800°C for 1 to 2 hours and then naturally cooled to room temperature. In the hot pressing step, heating the alloy material to the first temperature for hot pressing helps prevent coarse grains, thereby improving the production yield of the lightning protection metal mesh 40. For example, the first temperature is 1050°C, the first predetermined thickness is 10 mm, and after hot pressing, the alloy material is held at 750°C for 1.5 hours and then naturally cooled to room temperature.

[0083] In step S30, a cold rolling mill is used to forge the cooled alloy material to a desired thickness. To prevent the lightning protection metal mesh 40 from being too thick and affecting the aerodynamic layout of the wind turbine blades, the alloy material can be forged to 0.1-1 mm in this step.

[0084] In step S40, after forging and forming, pickling is performed. For example, the pickling solution includes: a sulfuric acid solution with a concentration of 10% and a nitric acid solution with a concentration of 5%. The treatment is carried out at room temperature for 5 minutes to 10 minutes to remove the oxide layer, and further anti-oxidation treatment is performed, and epoxy resin is coated to form a protective film after drying. Optionally, the spraying thickness is 50μm to 100μm.

[0085] In step S50 , a mesh punching machine is used to grind and punch the alloy material into a plurality of meshes to form the lightning protection metal mesh 40 .

[0086] Based on the same inventive concept, this disclosure also provides a wind turbine generator, please refer to Figure 1 The wind turbine includes any one of the wind turbine blade lightning protection metal meshes 40 provided by the embodiments of the present disclosure.

[0087] It should be noted that the embodiments of the wind turbine generator can refer to the embodiments of the wind turbine generator blade lightning protection metal mesh 40 provided in the present disclosure, and will not be repeated here.

[0088] It can be seen from the above embodiments that the lightning protection metal mesh for wind turbine blades and the manufacturing method thereof provided by the present disclosure achieve at least the following beneficial effects:

[0089] The present disclosure provides a lightning protection metal mesh for wind turbine blades and a method for manufacturing the same. The lightning protection metal mesh is applied to the blade tips of the wind turbine blades. Compared to providing a tip lightning receptor only at the blade tips, the lightning protection metal mesh can be applied to a larger area of the blades, providing a wider protection range for the blades, thereby facilitating improved protection of the wind turbine blades. Furthermore, the wind turbine of the present disclosure includes a blade body lightning receptor and a blade tip lightning receptor. The lightning protection metal mesh is connected to a grounding down conductor via the blade body lightning receptor and the blade tip lightning receptor. When the wind turbine blades are struck by lightning, the lightning current is directed to the ground via the lightning protection metal mesh. The lightning protection metal mesh has a larger application area and can conduct a larger lightning current, thereby facilitating the avoidance of damage to the internal structure of the blades due to excessive current during the conduction of lightning current through the metal conductors inside the blades. This helps prevent damage to the blades, thereby facilitating improved lightning protection of the lightning protection metal mesh.

[0090] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0091] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A lightning protection metal mesh for wind turbine blades, characterized in that: The lightning protection metal mesh is at least laid at the tip of the blade of the wind turbine; The wind turbine includes a blade tip lightning rod, a blade body lightning rod and a ground down conductor. The blade tip lightning rod and the blade body lightning rod are both connected to the ground down conductor. The lightning protection metal mesh is connected to the ground down conductor through the blade tip lightning rod and the blade body lightning rod.

2. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The lightning protection metal mesh includes a plurality of cross-arranged metal wires, the width of the metal wires along a first direction is W, and the first direction is parallel to the plane where the lightning protection metal mesh is located and perpendicular to the extension direction of the metal wires; W=A / H, Wherein, A represents the flow conduction area of the metal wire, I peak Indicates the lightning current withstand of the metal wire, J max represents the maximum lightning current withstand density of the metal wire, and n represents the safety factor; H represents the thickness of the lightning protection metal mesh along the second direction, and the second direction is perpendicular to the plane where the lightning protection metal mesh is located.

3. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The thickness of the lightning protection metal mesh along the second direction is H, and the second direction is perpendicular to the plane where the lightning protection metal mesh is located, and 0.1 mm≤H≤1 mm.

4. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The lightning protection metal mesh includes a plurality of cross-arranged metal wires, the width of the metal wires along a first direction is W, the first direction is parallel to the plane where the lightning protection metal mesh is located and perpendicular to the extension direction of the metal wires, and W is greater than or equal to 0.26 mm.

5. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The lightning protection metal mesh includes a plurality of cross-arranged metal wires; The mesh formed by the intersection of the metal wires is in the shape of a square or a rhombus, and the side length of the mesh is a; Wherein, ρ represents the resistivity of the metal wire, I max It represents the maximum withstand lightning current of the wind turbine, J cr represents the critical current density of the metal wire, S f Indicates the safety factor.

6. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The lightning protection metal mesh includes a plurality of cross-arranged metal wires, the mesh shape formed by the cross-arranged metal wires is square or diamond-shaped, and the side length of the mesh is a, 2mm≤a≤5mm.

7. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The laying length of the lightning protection metal mesh along the extension direction of the blades of the wind turbine is L, the length of the blades of the wind turbine is L0, and L≥10%×L0.

8. The lightning protection metal mesh for wind turbine blades according to claim 1, characterized in that: The material of the lightning protection metal mesh is copper-nickel alloy.

9. The lightning protection metal mesh for wind turbine blades according to claim 8, characterized in that: The raw materials of the lightning protection metal mesh include at least copper, nickel, iron and manganese, wherein the mass ratio of copper in the raw materials is 68% to 70%, the mass ratio of nickel is 28% to 30%, the mass ratio of iron is 0.5% to 1%, and the mass ratio of manganese is 0.5% to 1%.

10. A method for manufacturing a lightning protection metal mesh for a wind turbine blade, characterized in that: include: Melting: After mixing the raw materials in a preset ratio, vacuum melting is carried out in a preset vacuum environment to generate alloy materials; Hot pressing: hot pressing the alloy material to a first preset thickness at a first temperature; Cold pressing: cooling the hot-pressed alloy material, and forging the alloy material to a second preset thickness at a second temperature, wherein the second temperature is lower than the first temperature; Pickling: Pickling and anti-oxidation treatment are performed on the cold-pressed alloy material, and epoxy resin is coated; Stamping: The alloy material is stamped to form a lightning protection metal mesh.

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