阅读说明：本技术 一种风电叶片防雷系统及防雷风电叶片 (Wind power blade lightning protection system and lightning protection wind power blade ) 是由 胡杰桦 肖琼 易礼毅 梁鹏程 杨军 彭超义 冯学斌 彭勃 谭龙 凡盛 于 2021-01-04 设计创作，主要内容包括：本发明公开了一种风电叶片防雷系统及防雷风电叶片,风电叶片防雷系统包括铺设于风电叶片表面的金属网,金属网与引下线相连接,引下线与风力发电机的整机避雷系统连接,金属网上重叠设置有多层附加金属网,金属网与附加金属网之间以及相邻层的附加金属网之间均夹设有一根金属带,多根金属带伸入风电叶片的腔体内拧成一股后与引下线相连接。该风电叶片防雷系统及防雷风电叶片可减小电阻从金属网到金属带的突变程度,从而在雷电流从金属网传导至引下线的过程中,减少雷电流对金属带连接处附近区域的金属网的损伤。(The invention discloses a wind power blade lightning protection system and a lightning protection wind power blade, wherein the lightning protection system comprises a metal net laid on the surface of the wind power blade, the metal net is connected with a down lead, the down lead is connected with a whole lightning protection system of a wind driven generator, a plurality of layers of additional metal nets are overlapped on the metal net, a metal belt is clamped between each metal net and the additional metal nets and between the adjacent layers of additional metal nets, and the metal belts extend into a cavity of the wind power blade and are twisted into a strand and then connected with the down lead. The lightning protection system for the wind power blade and the lightning protection wind power blade can reduce the sudden change degree of the resistance from the metal mesh to the metal strap, so that the damage of lightning current to the metal mesh in the area near the metal strap connection position is reduced in the process that the lightning current is conducted from the metal mesh to the down lead.)

1. The utility model provides a wind-powered electricity generation blade lightning protection system, is including laying in metal mesh (1) on wind-powered electricity generation blade (100) surface, metal mesh (1) is connected with downlead (2), downlead (2) and aerogenerator's the lightning-arrest headtotail of complete machine, a serial communication port, the overlap is provided with additional metal mesh (3) of multilayer on metal mesh (1), metal mesh (1) with between additional metal mesh (3) and adjacent layer all press from both sides between additional metal mesh (3) and be equipped with a strap (4), many strap (4) stretch into in the cavity of wind-powered electricity generation blade (100) twist into the one after with downlead (2) are connected.

2. The wind power blade lightning protection system according to claim 1, wherein the metal nets (1) are arranged on the upper surface and the lower surface of the wind power blade (100), the metal nets (1) on the upper surface and the lower surface are connected with a plurality of metal belts (4), and the two metal belts (4) are connected with the down conductor (2) through a wiring device (5).

3. The wind blade lightning protection system according to claim 2, characterized in that the two strands of metal strips (4) and the down conductor (2) are fixedly mounted on a blade web (110) of the wind blade (100) by the doubling device (5).

4. The wind power blade lightning protection system according to claim 1, characterized in that the wind power blade lightning protection system further comprises a blade tip lightning receptor (6), the blade tip lightning receptor (6) is installed at the blade tip of the wind power blade (100), the tail of the blade tip lightning receptor (6) is embedded into the cavity of the wind power blade (100) and is connected with the down conductor (2), the blade tip lightning receptor (6) is provided with an insulating sleeve (7) at the joint of the down conductor (2), and the insulating sleeve (7) wraps the tail of the blade tip lightning receptor (6) and the part of the down conductor (2) which is connected.

5. The wind power blade lightning protection system according to claim 4, characterized in that the blade tip lightning receiving device (6) comprises an aluminum blade tip (601), the head of the aluminum blade tip (601) is exposed at the most tip end of the wind power blade (100), the tail of the aluminum blade tip (601) is embedded inside the wind power blade (100), the down conductor (2) is connected with the tail of the aluminum blade tip (601), and the insulating sleeve (7) wraps the tail of the aluminum blade tip (601) and the joint of the down conductor (2) and the tail of the aluminum blade tip (601).

6. The wind power blade lightning protection system according to claim 1, further comprising a blade lightning receptor (8), wherein the blade lightning receptor (8) is fixed in the cavity of the wind power blade (100), the blade lightning receptor (8) is connected to the down conductor (2) through a branch cable (9), the connection between the blade lightning receptor (8) and the branch cable (9) is insulated and wrapped by a first insulation box (10), and the connection between the branch cable (9) and the down conductor (2) is insulated and wrapped by a second insulation box (11).

7. The wind power blade lightning protection system according to claim 6, characterized in that the blade lightning receiving device (8) comprises a conductive block (801), the conductive block (801) is fixed in the cavity of the wind power blade (100), one end of the conductive block (801) is exposed out of the blade of the wind power blade (100), the branch cable (9) is fixedly connected to the conductive block (801) through a pressing device (802), and the first insulation box (10) wraps the conductive block (801) and the pressing device (802).

8. The wind blade lightning protection system according to claim 6, wherein the branch cable (9) is connected with the down conductor (2) through a parallel structure (12), and the second insulation box (11) is insulated and wrapped around the parallel structure (12).

9. A lightning protection wind blade comprising a wind blade (100), characterized in that the wind blade (100) is provided with a lightning protection system according to any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of lightning protection of wind power blades, in particular to a lightning protection system of a wind power blade and a lightning protection wind power blade.

Background

At present, all aerogenerator blades contain lightning protection systems, and lightning protection systems mainly comprise lightning receptors arranged on the surfaces of the blades and internal wires of the blade bodies, all the lightning receptors are connected with the wires, the wires are provided with interfaces of the complete machine at blade roots, and the lightning receptors receive lightning and are connected to the lightning protection systems of the complete machine through the wires, so that the glass fiber reinforced plastics of the blade bodies are prevented from being struck by lightning.

With the improvement of blade technology, especially the application of carbon fiber blade, the metal mesh is used in blade lightning protection system more and more, through lay the metal mesh on blade surface, the metal mesh is connected to lightning protection system main conductor through the downlead, when the blade suffers the thunderbolt with lightning current guide to the lightning protection system of wind-powered electricity generation complete machine.

However, in the conventional wind turbine blade using the metal mesh lightning protection system, since the contact area of the connection portion between the metal mesh and the down conductor is small, a large sudden change in resistance occurs from the metal mesh to the down conductor, and the metal mesh near the connection portion is easily damaged. In addition, current wind-powered electricity generation blade lightning protection system still includes apex lightning arrester and blade body lightning arrester usually, but the electrical connection part's of lightning arrester and downlead insulating properties is not enough, leads to the blade body to receive the thunder and lightning breakdown easily.

Disclosure of Invention

The invention mainly aims to provide a lightning protection system for a wind power blade and a lightning protection wind power blade, and at least solves the problem that a metal net near a connection part is easy to damage due to large resistance mutation from a metal net of the existing wind power generation blade adopting a metal net lightning protection system to a down lead.

In order to achieve the purpose, the invention provides a lightning protection system for a wind power blade, which comprises a metal net laid on the surface of the wind power blade, wherein the metal net is connected with a down lead, the down lead is connected with a whole lightning protection system of a wind driven generator, a plurality of layers of additional metal nets are overlapped on the metal net, a metal belt is clamped between each metal net and each additional metal net and between each two adjacent additional metal nets, and the metal belts extend into a cavity of the wind power blade and are twisted into one strand to be connected with the down lead.

Further, the upper surface and the lower surface of the wind power blade are provided with metal nets, the metal nets on the upper surface and the lower surface are connected with a plurality of metal belts, and the two metal belts are connected with a down lead together through a wiring device.

Further, the two metal strips and the down conductor are fixedly arranged on a blade web of the wind power blade through a wire merging device.

Furthermore, the lightning protection system for the wind power blade further comprises a blade tip lightning receiving device, the blade tip lightning receiving device is installed at the blade tip of the wind power blade, the tail of the blade tip lightning receiving device is embedded into the cavity of the wind power blade and is connected with the down lead, an insulating sleeve is arranged at the connection position of the blade tip lightning receiving device and the down lead, and the insulating sleeve wraps the tail of the blade tip lightning receiving device and the position where the down lead is connected.

Furthermore, the blade tip lightning receiving device comprises an aluminum blade tip, the head of the aluminum blade tip is exposed at the most tip end of the wind power blade, the tail of the aluminum blade tip is embedded into the wind power blade, the down lead is connected with the tail of the aluminum blade tip, and the insulating sleeve wraps the tail of the aluminum blade tip and the joint of the down lead and the tail of the aluminum blade tip.

Furthermore, the lightning protection system for the wind power blade further comprises a blade lightning receiving device, the blade lightning receiving device is fixed in the cavity of the wind power blade and is connected with the down lead through a branch cable, the junction of the blade lightning receiving device and the branch cable is wrapped in an insulating mode through a first insulating box, and the junction of the branch cable and the down lead is wrapped in an insulating mode through a second insulating box.

Further, the blade lightning receiving device comprises a conductive block, the conductive block is fixed in a cavity of the wind power blade, one end of the conductive block is exposed out of the blade of the wind power blade, the branch cable is fixedly connected onto the conductive block through a pressing device, and the first insulation box wraps the conductive block and the pressing device.

Furthermore, the branch cable is connected with the down lead through a parallel structure, and the second insulation box is wrapped in the parallel structure in an insulation mode.

According to another aspect of the invention, the lightning protection wind power blade comprises a wind power blade, and the lightning protection system for the wind power blade is installed on the wind power blade.

By applying the technical scheme of the invention, a plurality of layers of additional metal nets are overlapped on the metal nets, a metal belt is clamped between each metal net and each additional metal net and between the adjacent additional metal nets, and the metal belts extend into the cavity of the wind power blade and are twisted into a strand and then are connected with the down lead; through the alternative overlapping arrangement of additional metal mesh and metal strip, increased the area of contact of metal mesh and metal strip, reduced the sudden change degree of resistance from metal mesh to metal strip to in the process that lightning current conducts from metal mesh to the downlead, reduced the damage of lightning current to the metal mesh of the regional near metal strip junction.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a wind turbine blade lightning protection system according to an embodiment of the present invention.

Fig. 2 is a schematic view of connection of a metal strip, a metal mesh and a down conductor in the wind power blade lightning protection system according to the embodiment of the invention.

Fig. 3 is a schematic view of an additional metal mesh and a metal strip in a wind turbine blade lightning protection system according to an embodiment of the present invention, which are alternately overlapped.

Fig. 4 is a schematic connection diagram of an aluminum blade tip, a down conductor and an insulating sleeve in the wind turbine blade lightning protection system according to the embodiment of the invention.

Fig. 5 is a schematic connection diagram of a blade lightning receiving device and a down conductor in the wind turbine blade lightning protection system according to the embodiment of the invention.

Wherein the figures include the following reference numerals:

1. a metal mesh; 2. a down conductor; 3. attaching a metal net; 4. a metal strip; 5. a doubling device; 6. a blade tip lightning receptor; 7. an insulating sleeve; 8. a blade body lightning receptor; 9. a branch cable; 10. a first insulating case; 11. a second insulating case; 12. a doubling structure; 100. wind power blades; 110. a blade web; 601. an aluminum blade tip; 801. a conductive block; 802. and a pressing device.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in the description and in the claims of the present application do not denote any order, quantity, or importance, but rather the intention is to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1 to 5, a wind turbine blade lightning protection system according to an embodiment of the present invention mainly includes a metal mesh 1 laid on a surface of a wind turbine blade 100, where the metal mesh 1 is connected to a down conductor 2, and the down conductor 2 is connected to a lightning protection system (not shown in the figure) of a wind turbine generator; a plurality of layers of additional metal nets 3 are overlapped on the metal net 1, a metal belt 4 is respectively clamped between the metal net 1 and the additional metal nets 3 and between the adjacent layers of additional metal nets 3, and the plurality of metal belts 4 extend into the cavity of the wind power blade 100 and are twisted into a strand to be connected with the down lead 2.

In the wind power blade lightning protection system, a plurality of layers of additional metal nets 3 are overlapped on the metal net 1, a metal belt 4 is clamped between the metal net 1 and the additional metal nets 3 and between the adjacent layers of additional metal nets 3, and the metal belts 4 extend into a cavity of the wind power blade 100, are twisted into a strand and then are connected with the down lead 2; through the alternative overlapping arrangement of the additional metal net 3 and the metal belt 4, the contact area of the metal net 1 and the metal belt 4 is increased, and the sudden change degree of the resistance from the metal net 1 to the metal belt 4 is reduced, so that the damage of lightning current to the metal net 1 in the area near the connection position of the metal belt 4 is reduced in the process of conducting the lightning current from the metal net 1 to the down conductor 2.

Specifically, referring to fig. 2, in the present embodiment, metal nets 1 are disposed on both upper and lower surfaces of a wind turbine blade 100, the metal nets 1 on both upper and lower surfaces are connected to a plurality of metal strips 4, the metal strips 4 penetrate into a cavity from the upper and lower surfaces of the wind turbine blade 100 and are twisted into two strands, and the two strands of metal strips 4 are connected to a down conductor 2 through a doubling device 5. Thus, the metal nets 1 on the upper and lower surfaces of the wind turbine blade 100 can be prevented from being damaged by lightning current. Further, in this embodiment, the two strands of metal strips 4 and the down conductor 2 are fixedly mounted on the blade web 110 of the wind turbine blade 100 by a doubling device 5.

Referring to fig. 1 and 4, in this embodiment, the lightning protection system for a wind turbine blade further includes a blade tip lightning receptor 6, the blade tip lightning receptor 6 is installed at a blade tip of the wind turbine blade 100, and a tail of the blade tip lightning receptor 6 is embedded into a cavity of the wind turbine blade 100 and connected to the down conductor 2; and, still be provided with an insulating cover 7 in this apex lightning arrester 6 and the junction of downlead 2, the position that the afterbody of this apex lightning arrester 6 is connected with downlead 2 is lived to this insulating cover 7 parcel. So set up, set up insulating cover 7 through the position that apex lightning arrester 6 is connected with downlead 2 and carry out insulating parcel, improved apex lightning arrester 6 and downlead 2 junction's insulating properties, avoided the direct and thunder and lightning of the inside metalwork of blade to switch on, reduced the risk that the blade was punctured to the thunder and lightning, increased the reliability of junction simultaneously.

Specifically, referring to fig. 4, in the present embodiment, the blade tip lightning receptor 6 includes an aluminum blade tip 601, the head of the aluminum blade tip 601 is exposed at the most tip end of the wind turbine blade 100, the tail of the aluminum blade tip 601 is embedded inside the wind turbine blade 100, the down conductor 2 is connected to the tail of the aluminum blade tip 601, and the insulating sheath 7 wraps the tail of the aluminum blade tip 601 and the connection position of the down conductor 2 and the tail of the aluminum blade tip 601. Due to the arrangement, the blade shell at the blade tip part is thin, so that the blade is easy to be broken down by lightning; moreover, when the aluminum blade tip 601 is exposed in the air, the resistance is increased after the surface is corroded and passivated along with the time, so that the lightning receiving performance of the exposed part of the aluminum blade tip 601 is reduced, and the probability of lightning receiving between the tail part of the aluminum blade tip 601 and the down conductor 2 is increased; the insulating sleeve 7 is arranged at the joint of the tail of the aluminum blade tip 601 and the down lead 2 for insulating and wrapping, so that the insulating property of the tail of the aluminum blade tip 601 can be effectively improved, and the risk of lightning breakdown of the blade is effectively reduced.

Referring to fig. 1 and 5, in the present embodiment, the lightning protection system of the wind turbine blade further includes a blade lightning receptor 8, the blade lightning receptor 8 is fixed in the cavity of the wind turbine blade 100, and the blade lightning receptor 8 is connected to the down conductor 2 through a branch cable 9; and the junction of the blade lightning arrester 8 and the branch cable 9 is insulated and wrapped by a first insulating box 10, and the junction of the branch cable 9 and the down conductor 2 is insulated and wrapped by a second insulating box 11. Set up like this, carry out insulating parcel through first insulating box 10 to the junction of blade lightning arrester 8 and branch cable 9, carry out insulating parcel through the junction of second insulating box 11 to branch cable 9 and downlead 2, can improve the insulating properties of these two junctions, further reduce the risk that the thunder and lightning punctures the blade from the blade.

Specifically, referring to fig. 5, in this embodiment, the blade lightning receptor 8 includes a conductive block 801, the conductive block 801 is fixed in the cavity of the wind turbine blade 100, one end of the conductive block 801 is exposed from the blade of the wind turbine blade 100, the branch cable 9 is fixedly connected to the conductive block 801 through a pressing device 802, and the conductive block 801 and the pressing device 802 are wrapped by the first insulating box 10. The branch cable 9 is connected to the down conductor 2 by a cable-combining structure 12, and a second insulating case 11 is insulated from and covers the cable-combining structure 12.

Another embodiment of the present invention provides a lightning protection wind turbine blade, which includes a wind turbine blade 100, wherein the wind turbine blade 100 is provided with the lightning protection system of the wind turbine blade according to the above embodiment of the present invention, and the lightning protection system of the wind turbine blade has the above structure, which is not described herein again.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.