A lightning protection blade for wind turbine

Abstract

The invention discloses a lightning protection blade for a wind turbine, belonging to the technical field of wind power generation. The upper and lower parts of the base are connected to the blade body and the connector respectively, a second cavity is provided in the blade body, and a support plate is provided inside the second cavity; a support column passes through the support plate and the two ends are connected to the inner wall of the second cavity; a third cavity is provided outside the second cavity, and a metal mesh is provided inside the third cavity; a first conductive strip is provided on the outer surface of the blade body, and the first conductive strip is connected to a lead-in terminal; a second conductive strip is connected to the tip of the blade body, and the second conductive strip is connected to a lightning receptor, and the bottom of the lightning receptor passes through the blade body to reach the third cavity and is connected to the metal mesh; a conductive rod is connected to the back surface of the blade body, and the first conductive strip and the second conductive strip are both connected to the conductive rod, and the conductive rod is connected to the grounding device of the wind turbine through a wire. The invention can effectively protect the blade from lightning strikes, and improve the firmness of the blade while reducing the weight of the blade, thereby increasing the service life of the blade.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a lightning protection blade for a wind turbine. Background Art

[0002] Wind turbines are usually installed in open fields and are often struck by lightning during thunderstorms. Since the blades of wind turbines are at a high position during rotation, lightning protection devices need to be installed on the blades of wind turbines. Existing lightning protection blades have the following shortcomings:

[0003] 1) The current lightning protection measure for wind turbine blades is to arrange lightning rods at the tip of the blades, but the traditional lightning protection method has poor lightning protection effect and little protection against lightning strikes; 2) The overall structure of the blades is not strong enough, and cracks are prone to appear due to long-term environmental influences, and the service life is short. Summary of the invention

[0004] In order to solve the defects of the above-mentioned prior art, the purpose of the present invention is to provide a lightning protection blade for a wind turbine, which can effectively protect the blade from lightning strikes, and improve the strength of the blade while reducing the weight of the blade, thereby increasing the service life of the blade.

[0005] The present invention is achieved through the following technical solutions:

[0006] The invention discloses a lightning protection blade for a wind turbine generator set, comprising a base and a blade body, wherein the upper part of the base is connected to the blade body, the lower part of the base is connected to a connector for connecting to a hub, and a second cavity is provided inside the blade body; a plurality of support plates are fixedly arranged in the second cavity; a support column is fixedly arranged on the inner side of the blade body, the support column passes through the support plate, and both ends are fixedly connected to the inner wall of the second cavity; a third cavity is provided on the outer side of the second cavity, a metal mesh is arranged in the third cavity, a plurality of first conductive strips are fixedly arranged on the outer surface of the blade body, and a plurality of lead terminals are fixedly connected to the first conductive strips; a second conductive strip is fixedly connected to the tip of the blade body, a lightning receptor is fixedly connected to the second conductive strip, the bottom of the lightning receptor passes through the outer wall of the blade body to reach the third cavity and is fixedly connected to the metal mesh; a conductive rod is fixedly connected to the back surface of the blade body, the first conductive strip and the second conductive strip are both fixedly connected to the conductive rod, a conductive rod is connected to a wire, and the wire is connected to a grounding device of the wind turbine generator set.

[0007] Preferably, a plurality of first connecting columns are fixedly connected to one side of the support plate, and the first connecting columns are fixedly connected to the inner wall of the second cavity, and a plurality of second connecting columns are fixedly connected to the other side of the support plate, and the second connecting columns are fixedly connected to the inner wall of the second cavity.

[0008] Further preferably, the first connecting pillars and the second connecting pillars are arranged in pairs, and the axes of each pair of the first connecting pillars and the second connecting pillars are located on the same straight line.

[0009] Preferably, the number of the support columns is 2, which are respectively arranged close to the leading edge and the trailing edge of the blade body.

[0010] Preferably, several support plates are arranged in parallel.

[0011] Preferably, a plurality of first conductive strips are arranged in parallel.

[0012] Further preferably, the distance between adjacent first conductive strips is 1-2 m.

[0013] Preferably, the number of the connecting terminals on the first conductive strip is 2, and the two connecting terminals are symmetrically arranged with the axis of the blade body as the center.

[0014] Preferably, the length of the connecting terminal is 20-50 cm.

[0015] Preferably, the first conductive strip, the second conductive strip, the conductive rod and the connecting terminal are made of aluminum.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The invention discloses a lightning protection blade for a wind turbine. A lightning receptor is arranged at the tip of the blade, and a first conductive strip, a second conductive strip, and a lead-in terminal are arranged on the blade body. When the lightning receptor is struck by lightning, the current passes through the second conductive strip and the conductive rod to reach the grounding device of the wind turbine. If a large amount of charge is accumulated near the blade body, the lead-in terminal can lead the current to the first conductive strip under the influence of the tip discharge, and finally reaches the grounding device of the wind turbine through the conductive rod, thereby expanding the lightning protection area and protecting the blade from lightning strikes. At the same time, in terms of structure, by arranging a support plate, a support column, and a metal mesh in the third cavity, the overall weight of the blade is reduced while the firmness of the blade is improved, and the blade has the advantages of good lightning protection effect, firm structure, and long service life.

[0018] Furthermore, the first connecting column and the second connecting column can increase the supporting force of the side surface of the supporting plate and improve the firmness of the blade.

[0019] Furthermore, the axes of the first connecting column and the second connecting column are located on the same straight line, so that the direction of the supporting force of the support plate by the two will not generate a force arm to affect the stability of the support plate.

[0020] Furthermore, the number of support columns is 2, which are respectively arranged close to the leading edge and the trailing edge of the blade body, which can effectively provide supporting force while reducing the weight of the blade.

[0021] Furthermore, a plurality of support plates are arranged in parallel, the force is evenly distributed, and installation and manufacturing are facilitated.

[0022] Furthermore, a plurality of first conductive strips are arranged in parallel and are evenly distributed, which has a good current drainage effect and is easy to install and manufacture.

[0023] Furthermore, the distance between adjacent first conductive strips is 1-2 m, which can provide comprehensive protection and reduce weight.

[0024] Furthermore, the first conductive strip, the second conductive strip, the conductive rod and the connecting terminal are made of aluminum, which is light and has good conductive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall cross-sectional schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall appearance of the present invention;

[0027] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0028] In the figure: 1-base; 2-connecting piece; 3-blade body; 4-support plate; 5-first connecting column; 6-second connecting column; 7-support column; 8-metal mesh; 9-first conductive strip; 10-connecting terminal; 11-second conductive strip; 12-lightning arrester; 13-conductive rod; 14-conducting wire. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings, the contents of which are intended to explain the present invention rather than to limit it:

[0030] like Figure 1 to Figure 3 The lightning protection blade for a wind turbine of the present invention comprises a base 1, a connector 2 is welded and fixed to the bottom of the base 1, the connector 2 generally adopts a flange assembly, the connector 2 is used to connect to the hub, and the connector 2 can adopt a flange.

[0031] A first cavity is opened inside the base 1, a blade body 3 is welded and fixed on the top of the base 1, and a second cavity is opened inside the blade body 3; a plurality of support plates 4 are fixedly arranged in the second cavity, a plurality of first connecting columns 5 are welded and fixed on the rear surface of the support plate 4, the first connecting columns 5 are welded and fixed to the inner wall of the second cavity, a plurality of second connecting columns 6 are welded and fixed on the outer surface of the support plate 4, the second connecting columns 6 are welded and fixed to the inner wall of the second cavity.

[0032] Two support columns 7 are welded and fixed on the inner side of the blade body 3 on the base 1, and the support columns 7 pass through the support plate 4 and are welded and fixed to the inner wall of the second cavity; a third cavity is opened on the outer side of the second cavity in the blade body 3, and a layer of metal mesh 8 is arranged in the third cavity; a plurality of first conductive strips 9 are fixedly arranged on the outer surface of the blade body 3, and a plurality of lead terminals 10 are welded and fixed on the first conductive strips 9; a second conductive strip 11 is welded and fixed on the top of the blade body 3, and a lightning receptor 12 is welded and fixed on the second conductive strip 11, and the bottom of the lightning receptor 12 passes through the outer wall of the blade body 3 to reach the third cavity, and the lightning receptor 12 is welded and fixed to the metal mesh 8, and a conductive rod 13 is welded and fixed on the right side surface of the blade body 3, and the first conductive strip 9 and the second conductive strip 11 are both welded and fixed to the conductive rod 13, and the lower end of the conductive rod 13 passes through the upper surface of the blade body 3 to reach the inside of the first cavity, and a wire 14 is welded and fixed on the lower end of the conductive rod 13, and the wire 14 is connected to the grounding device of the wind turbine.

[0033] Preferably, the first conductive strip 9 , the second conductive strip 11 , the conductive rod 13 , and the connecting terminal 10 are all made of aluminum.

[0034] Preferably, the blade body 3 is made of carbon fiber reinforced composite material.

[0035] Preferably, the distance between two adjacent first conductive strips 9 is 1-2 m.

[0036] Preferably, there are two connecting terminals 10 on a single first conductive strip 9 , the two connecting terminals 10 are symmetrically distributed with the blade body 3 as the center, and the length of the connecting terminal 10 is 20 to 50 cm.

[0037] Working principle of the present invention:

[0038] The lightning protection blades of the wind turbine set of the present invention are installed on the wind turbine equipment through the connecting piece 2, and the wire 14 is connected to the grounding device of the wind turbine set. When the lightning receptor 12 is struck by lightning, the current passes through the second conductive strip 11, the conductive rod 13 and the wire 14 to reach the grounding device of the wind turbine set. If a large amount of charge accumulates near the blade body, affected by the tip discharge, the lead-in terminal 10 leads the current to the first conductive strip 9, and then passes through the conductive rod 13 and the wire 14, and finally reaches the grounding device of the wind turbine set.

[0039] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions. The above is only to further illustrate the content of the present invention with examples for easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention.

Claims

1. A lightning protection blade for a wind turbine, comprising a base (1) and a blade body (3), wherein the upper portion of the base (1) is connected to the blade body (3), and the lower portion of the base (1) is connected to a connecting piece (2) for connecting to a hub, wherein: A second cavity is provided inside the blade body (3); a plurality of support plates (4) are fixedly arranged in the second cavity; a support column (7) is fixedly arranged on the inner side of the blade body (3); the support column (7) passes through the support plate (4) and is fixedly connected to the inner wall of the second cavity at both ends; a third cavity is provided outside the second cavity; a metal mesh (8) is arranged in the third cavity; a plurality of first conductive strips (9) are fixedly arranged on the outer surface of the blade body (3); a plurality of lead terminals (10) are fixedly connected to the first conductive strips (9); the blade body (3) The blade tip is fixedly connected to a second conductive strip (11), the second conductive strip (11) is fixedly connected to a lightning receptor (12), the bottom of the lightning receptor (12) passes through the outer wall of the blade body (3) to reach the third cavity and is fixedly connected to the metal mesh (8); the back surface of the blade body (3) is fixedly connected to a conductive rod (13), the first conductive strip (9) and the second conductive strip (11) are both fixedly connected to the conductive rod (13), the conductive rod (13) is connected to a wire (14), and the wire (14) is connected to a grounding device of the wind turbine generator set; A plurality of first connection columns (5) are fixedly connected to one side of the support plate (4), and the first connection columns (5) are fixedly connected to the inner wall of the second cavity; a plurality of second connection columns (6) are fixedly connected to the other side of the support plate (4), and the second connection columns (6) are fixedly connected to the inner wall of the second cavity; The first connecting column (5) and the second connecting column (6) are arranged in pairs, and the axes of each pair of the first connecting column (5) and the second connecting column (6) are located on the same straight line; The number of the support columns (7) is 2, and they are respectively arranged close to the leading edge and the trailing edge of the blade body (3); A plurality of support plates (4) are arranged in parallel; A plurality of first conductive strips (9) are arranged in parallel; The distance between adjacent first conductive strips (9) is 1-2 m; The number of the connecting terminals (10) on the first conductive strip (9) is two, and the two connecting terminals (10) are symmetrically arranged with the axis of the blade body (3) as the center; The length of the connecting terminal (10) is 20 to 50 cm.

2. The lightning protection blade for wind turbine generator set according to claim 1, characterized in that: The first conductive strip (9), the second conductive strip (11), the conductive rod (13) and the connecting terminal (10) are made of aluminum.

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