Metal net grounding piece

Abstract

The utility model relates to the field of wind power blades, and mainly discloses a metal net grounding piece which comprises a laying area formed by a metal net, the end portion of the laying area is connected with a flow guide area, the flow guide area is provided with a round hard point close to the tip end, the round hard point is divided into an upper hard point and a lower hard point, and the upper hard point and the lower hard point are connected in a penetrating mode through a connecting nail. And the surfaces of the upper hard points and the lower hard points, which are contacted with the metal net of the diversion area, are fused and welded in the diversion area. The metal net in the flow guide area is installed in a sandwich mode through the upper hard point and the lower hard point, and the upper hard point and the lower hard point are connected with the metal net in a fusion welding mode. The process conversion from pre-connection of the lightning arrester and the metal net grounding piece and integral pouring forming of the blade shell to pouring forming of the metal net grounding piece and the blade shell and post-entry of the lightning arrester is achieved, and the problem that maintenance cannot be achieved due to the poor quality problem of integral pouring forming is solved.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine blades, and more specifically, to a metal mesh grounding component. Background Technology

[0002] With the rapid development of lightweight and large-scale wind turbine blades, the proportion of carbon fiber blades is also increasing. Due to the conductivity of carbon fiber, a metal mesh is laid on the outer surface of the carbon fiber material to prevent damage from lightning strikes. Grounding devices are added to both sides of the metal mesh to effectively discharge the current from lightning strikes on the metal mesh.

[0003] Conventional metal mesh grounding components are mainly divided into two categories:

[0004] Category 1: Metal mesh grounding components without lightning arresters. Metal mesh grounding components located inside the blades are susceptible to structural damage from lightning strikes due to the lack of lightning arresters.

[0005] The second category includes metal mesh grounding components with lightning arrester connections. Currently, the mainstream method for metal mesh grounding components with lightning arrester connections involves pre-connecting the lightning arrester to the metal mesh grounding component and then molding it together with the wind turbine blade shell using resin injection. Because this requires manual tightening, reliability is poor; once loosened, the molded blade is almost impossible to repair. Therefore, the lightning arrester connecting the metal mesh grounding component needs to be changed from an integral pre-embedded process to a post-processing mechanical milling and tapping process.

[0006] The existing hot-press soldering process for metal mesh grounding components results in insufficient bonding between the disc and the metal mesh, failing to meet the requirements for milling the lightning arrester's surface before further processing and installation.

[0007] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0008] The purpose of this invention is to provide a metal mesh grounding component to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solutions:

[0010] A metal mesh grounding component includes a laying area formed by a metal mesh, with a current-guiding area connected to the end of the laying area. The width of the current-guiding area decreases towards the tip at the end away from the laying area. The thickness of the current-guiding area is greater than the thickness of the laying area. A circular hard point is provided near the tip of the current-guiding area. The circular hard point is divided into an upper hard point and a lower hard point. The upper hard point and the lower hard point are arranged opposite to each other and sandwich the current-guiding area in the middle. The upper hard point and the lower hard point are connected through a connecting nail, which also penetrates the metal mesh of the current-guiding area. The sides of the upper hard point and the lower hard point that contact the metal mesh of the current-guiding area are fused and welded to the current-guiding area.

[0011] Furthermore, the upper hard point has a thickness of 3mm, and the lower hard point has a thickness of 2mm.

[0012] Furthermore, several through holes are evenly distributed on the upper and lower hard points, and the connecting pin is disposed through the through holes.

[0013] Furthermore, the diameter of the connecting pin is slightly larger than the diameter of the through hole.

[0014] Furthermore, the connecting pin is installed through the through hole by high-speed rotational friction welding.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention uses upper and lower hard points to sandwich the metal mesh in the flow guide area, and the upper and lower hard points are also connected to the metal mesh by fusion welding. This realizes the process transformation from pre-connection of the lightning arrester and the metal mesh grounding component and integral injection molding of the blade shell to injection molding of the metal mesh grounding component and the blade shell followed by installation of the lightning arrester. This avoids the unrepairable problems caused by poor quality of integral injection molding. At the same time, compared with the hot-press soldering process of sandwiching two circular pieces, the integral metal mesh grounding component welded by the fusion welding process of the connecting nails of the same metal material is more robust, meeting the requirements of milling the circular hard point plane of the lightning arrester and mechanically tightening it. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a metal mesh grounding component according to an embodiment of the present utility model;

[0018] Figure 2 This is a side sectional view of a metal mesh grounding component according to an embodiment of the present utility model;

[0019] Figure 3 This is a side sectional view of a metal mesh grounding component with a lightning arrester installed according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the upper hard point in a metal mesh grounding component according to an embodiment of the present utility model;

[0021] Figure 5 This is a structural schematic diagram of a metal mesh grounding component assembled according to an embodiment of the present utility model.

[0022] Figure label:

[0023] 1. Laying area; 2. Guide zone; 3. Circular hard point; 301. Upper hard point; 302. Lower hard point; 303. Through hole; 4. Connecting pin; 5. Lightning arrester; 6. Working platform; 7. Fixture; 8. Rotating platform; 9. Holder. Detailed Implementation

[0024] The utility model will now be further described with reference to the accompanying drawings and specific embodiments:

[0025] Please see Figure 1-3 According to an embodiment of the present invention, a metal mesh grounding component includes a laying area 1 formed of metal mesh. A current-guiding area 2 is connected to the end of the laying area 1. The width of the current-guiding area 2 decreases towards the tip, away from the laying area 1. The thickness of the current-guiding area 2 is greater than that of the laying area 1. Generally, the current-guiding area 2 is formed by folding the laying area 1 to ensure that the same cross-section has the same current-carrying capacity. Near the tip of the current-guiding area 2, a circular hard point 3 is placed. The circular hard point 3 is divided into an upper hard point 301 and a lower hard point 302, which are arranged opposite to each other. The flow guide area 2 is clamped, and the upper hard point 301 and the lower hard point 302 are connected by a connecting nail 4. The connecting nail 4 also penetrates the metal mesh of the flow guide area 2. After the upper hard point 301 and the lower hard point 302 are stably connected to the metal mesh of the flow guide area 2, the lightning arrester 5 is then inserted through the upper hard point 301 and the lower hard point 302. At this time, the lightning arrester 5 can be stably connected to the metal mesh of the flow guide area 2 at the same time. The side of the upper hard point 301 and the lower hard point 302 that contacts the metal mesh of the flow guide area 2 is fused and welded to the flow guide area 2.

[0026] The metal mesh of the guide zone 2 is installed in a sandwich manner by using upper hard point 301 and lower hard point 302. The upper hard point 301 and lower hard point 302 are also connected to the metal mesh by fusion welding. This realizes the process transformation from pre-connection of the lightning arrester 5 and the metal mesh grounding component and integral injection molding of the blade shell to injection molding of the metal mesh grounding component and the blade shell followed by the installation of the lightning arrester 5. This avoids the maintenance problems caused by poor quality of integral injection molding.

[0027] Meanwhile, compared with the hot-press soldering process of two circular sandwich layers, the integrated metal mesh grounding component with the same metal material connecting nail 4 fusion welding process is more robust, meeting the requirements of the lightning arrester 5 milling the circular hard point 3 plane and mechanically tightening.

[0028] The upper hard point 301 has a thickness of 3mm and the lower hard point 302 has a thickness of 2mm, so as to ensure that the integrated metal mesh grounding component has good blade surface adhesion performance, while also having the function of connecting the metal mesh grounding component to the milled plane of the lightning arrester 5 after processing.

[0029] Multiple through holes 303 are evenly distributed on the upper hard point 301 and the lower hard point 302. The diameter of the connecting nail 4 is slightly larger than the diameter of the through hole 303. The connecting nail 4 is installed through the through hole 303 by high-speed rotational friction welding.

[0030] Please see Figure 4 During assembly, the tip of the metal mesh guide area 2 is first folded into shape. An upper hard point 301 and a lower hard point 302 are added to both sides of the tip. After aligning the through holes 303 on the upper hard point 301 and the lower hard point 302, they are placed on the work platform 6. The upper hard point 301, the guide area 2, and the lower hard point 302 are then fixed to the work platform 6 using a clamp 7 to ensure stability. At the same time, a high-speed rotating platform 8 is installed above the work platform 6. A clamp 9 is installed at the output end of the rotating platform 8 to stably clamp the connecting nail 4. Then, the rotating platform 8 drives the connecting nail 4 to a speed of more than 2500 rpm. After aligning the through holes 303, friction melting welding is performed to make the upper hard point 301 and the lower hard point 302 integrally formed with the metal mesh guide area 2. The metal mesh grounding part is then removed, and the protrusions on the surface of the upper hard point 301 and the lower hard point 302 are removed. At the same time, the surface is treated with anti-corrosion.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., 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, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal mesh grounding component, characterized in that, The device includes a laying area (1) formed by a metal mesh, and a flow guiding area (2) is connected to the end of the laying area (1). The width of the flow guiding area (2) decreases to the tip at the end away from the laying area (1). The thickness of the flow guiding area (2) is greater than the thickness of the laying area (1). A circular hard point (3) is provided near the tip of the flow guiding area (2). The circular hard point (3) is divided into an upper hard point (301) and a lower hard point (302). The upper hard point (301) and the lower hard point (302) are arranged opposite to each other and sandwich the flow guiding area (2) in the middle. The upper hard point (301) and the lower hard point (302) are connected through a connecting nail (4). The side of the upper hard point (301) and the lower hard point (302) that contacts the metal mesh of the flow guiding area (2) is fused and welded to the flow guiding area (2).

2. The metal mesh grounding component according to claim 1, characterized in that, The upper hard point (301) has a thickness of 3 mm, and the lower hard point (302) has a thickness of 2 mm.

3. A metal mesh grounding component according to claim 2, characterized in that, A plurality of through holes (303) are evenly distributed on the upper hard point (301) and the lower hard point (302), and the connecting nail (4) is provided through the through holes (303).

4. A metal mesh grounding component according to claim 3, characterized in that, The diameter of the connecting pin (4) is slightly larger than the diameter of the through hole (303).

5. A metal mesh grounding component according to claim 4, characterized in that, The connecting pin (4) is installed through the through hole (303) by high-speed rotational friction welding.

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