CN212360047U

CN212360047U - Lightning protection grounding device of yaw system

Info

Publication number: CN212360047U
Application number: CN202020484905.1U
Authority: CN
Inventors: 曹兴华; 杨海兵; 耿金顺
Original assignee: SHANGHAI MORGAN CARBON CO Ltd
Current assignee: SHANGHAI MORGAN CARBON CO Ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2021-01-15
Anticipated expiration: 2030-04-03

Abstract

The utility model discloses a yaw system lightning protection earthing device, which relates to the field of fan power generation, and comprises a brush box, an electric brush and a lightning protection bracket, wherein the brush box comprises an opening, the electric brush is arranged in the opening, the electric brush comprises a wire, the wire is connected with the lightning protection bracket, the brush box also comprises an elastic component, one end of the elastic component is connected with the bottom of the brush box, and the other end of the elastic component is connected with the bottom of the electric brush; the lightning protection support comprises a conductive cross beam, the middle of the conductive cross beam is vertically connected with the lightning protection support, at least one brush box is arranged at two ends of the conductive cross beam, and the opening faces to the normal direction of the same side of the conductive cross beam and is parallel to the horizontal plane. The technical effect of the utility model lies in that simple structure, compact practicality, the mounted position is adjusted conveniently, but the wheel hub driftage gear of the multiple model of adaptation simultaneously.

Description

Lightning protection grounding device of yaw system

Technical Field

The utility model relates to a fan power generation field especially relates to a driftage system lightning grounding device.

Background

Wind energy is the most mature renewable clean energy with the most scale development conditions in the current technology. The wind power generation provides a foundation for harmonious development of human and nature. Because the wind generating set works in a natural environment, the wind generating set is inevitably influenced by natural disasters. Due to the rapid development of modern science and technology, the single machine capacity of the wind generating set is larger and larger, in order to absorb more energy, the height of the hub and the diameter of the impeller are increased, the risk of being struck by lightning is relatively increased, and the striking by lightning is a disaster which has the greatest harm to the safe operation of the wind generating set in nature. The huge energy released by thunder can cause the damage of the blades of the wind generating set, the insulation breakdown of the generator, the burning of control components and the like. China is in coastal areas with complex terrain and more thunderstorm days, and great threats brought to wind turbine generators and operators by lightning strike should be fully paid attention to.

In order to improve the reliability of the wind turbine, a professional lightning protection grounding device needs to be configured to effectively conduct lightning strike current, so as to avoid damage to components of the wind turbine, for example, the blade root current is directly guided to a hub where a yaw system is located, then the current of the yaw system is directly guided to a busbar, and then the current is guided to the ground through a tower, so as to avoid breakdown of a yaw gear inside the yaw system by high voltage and high current caused by lightning and damage to the yaw gear.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem that a simple structure, compactness and loading and unloading convenient carbon brush formula lightning grounding device is provided, provide reliable lightning protection guarantee for wind generating set's driftage system.

In order to achieve the above object, the utility model provides a lightning protection grounding device of yaw system, including brush box, brush and lightning protection support, the brush box includes the opening, the brush is arranged in the opening, the brush includes the wire, the wire is connected with the lightning protection support, the brush box still includes elastomeric element, elastomeric element's one end with the bottom of brush box meets, elastomeric element's the other end with the brush bottom meets;

the lightning protection support comprises a conductive cross beam, the middle of the conductive cross beam is vertically connected with the lightning protection support, at least one brush box is arranged at two ends of the conductive cross beam, and the opening faces to the normal direction of the same side of the conductive cross beam and is parallel to the horizontal plane.

Furthermore, the brush box is connected with the connecting ends at the two ends of the conductive beam in a rotating mode, and the connecting ends are provided with rotating and fixing devices.

Further, the electric brush is a metal graphite carbon brush.

Further, the elastic component comprises a constant force spring and a spring support, and the constant force spring is fixed on the brush box through the spring support.

Furthermore, the connecting end of the conductive beam and the lightning protection bracket is provided with a grounding wire.

Furthermore, one end of the conductive beam at least comprises two brush boxes and the electric brush, and the at least two brush boxes positioned at the end part of the conductive beam at the same side are connected in parallel.

The technical effect of the utility model lies in that simple structure, compact practicality, the mounted position is adjusted conveniently, but the driftage system of the multiple model specification of adaptation simultaneously.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

description of reference numerals: 1-an electric brush; 2-brush box; 3-lightning protection support; 4-a conductive beam; 5-a conductive backing plate; 6-an elastic member; 61-a spring support; 62-a constant force spring; 7-opening; 8-rotating the fixing device.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

As shown in fig. 1, the utility model discloses a lightning protection grounding device of yaw system, including brush box 2, brush 1 and lightning protection support 3, brush box 2 includes opening 7, brush 1 is arranged in opening 7, brush 1 still includes the wire, the wire is connected with lightning protection support 3, brush box 2 still includes elastomeric element 6, the one end of elastomeric element 6 is connected with the bottom of brush box 2, the other end of elastomeric element 6 is connected with brush 1 bottom; lightning protection support 3 includes conductive beam 4, and conductive beam 4's middle part passes through hex bolts M10X64 and hexagon nut M10 vertical fixation with lightning protection support 3, and at least one brush box 2 is set up in conductive beam 4's both ends, and opening 7 is parallel with the horizontal plane towards the normal direction of conductive beam 4's homonymy.

Lightning protection support 3 passes through hexagon bolt M8X25 to be fixed on the wheel hub of fan, and electrically conductive crossbeam 4 should extend to the wheel hub department at driftage system place this moment, is connected to the opening of the brush box 2 of electrically conductive crossbeam 4 towards wheel hub, and brush 1 inside the brush box 2 is partial the butt with the circular arc of the inside yaw gear of driftage system. When the fan is struck by lightning, the lightning receptor on the fan blade firstly transmits the lightning current to the electric brush 1 through the outgoing line, the electric brush 1 transmits the lightning current to the lightning protection bracket 3 through a lead, the lightning protection bracket 3 is connected with a grounding wire, and the lightning current is transmitted to the ground through the grounding wire. Therefore, the lightning current flows along a new external channel without passing through the fan yaw system, so that the normal operation of the yaw system in the wind generating set is effectively ensured, the service life is prolonged, the normal operation of the wind generating set is ensured, and the electric conductivity of the lightning current discharge passage is greatly improved.

Further, the elastic member 6 includes a constant force spring 62 and a spring holder 61, and the constant force spring 62 is fixed in the brush box 2 by the spring holder 61. With the brush box 2 positionally fixed, the brush 1 is abutted against and pressed against the circular arc portion of the yaw gear by the constant force spring 62. In addition, the brush 1 is worn during the friction between the yaw gear and the brush 1, and the brush 1 deformed by the wear is still firmly abutted against the yaw gear by the constant force spring 62.

Further, the brush box 2 is rotatably connected with the connecting end of the conductive beam 4, and the connecting end is provided with a rotary fixing device 8.

Because the driftage gear has the arc surface, and the driftage gear of different specifications, the radian of its arc surface is also different, has caused lightning protection earthing device adaptation face from this to be narrow, the loaded down with trivial details problem of design, consequently changes the link at brush box 2 and electrically conductive crossbeam 4 both ends into swivelling joint to set up rotatory fixing device 8 at the link. Therefore, when the lightning protection grounding device is installed, the direction and the inclination angle of the opening 7 of the brush box 2 can be fully adjusted, the brush box 2 is fixed by the rotating and fixing device 8 at a proper angle, and the electric brush 1 is fully abutted with the yaw gear.

Further, the brush 1 is a metal graphite carbon brush. Carbon brush density is 6.5g/cm³Rockwell hardness 81(RH.10/392N), flexural strength 65MPa, resistivity 0.06 (. mu. OMEGA.M), and metal content approximately 95% with copper. According to the IEC 61400-24 standard, the lightning protection grounding device should withstand at least 200KA of lightning current.

Further, the connecting end of the conductive beam 4 and the lightning protection bracket 3 is provided with a grounding wire, and the paths of lightning currents transmitted by the two ends are opposite and the paths are the same. Preferably, the ground lead may be fixed by a bolt M10X64 connecting the conductive beam 4 and the lightning protection bracket 3.

Further, one end of the conductive beam 4 may connect a plurality of brush boxes 2 and brushes 1. At least two electric brushes 1 positioned at the end part of the same side of the conductive beam 4 are connected in parallel, so that the resistance of a conductive module, namely the electric brushes 1 can be further reduced, and the range of the current bearable of the lightning protection grounding device can be enlarged. According to the specification of the actual yaw gear, the number of the brush boxes 2 at the two ends of the conductive cross beam 4 can be different.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A lightning protection grounding device of a yaw system is characterized by comprising a brush box, an electric brush and a lightning protection bracket, wherein the brush box comprises an opening, the electric brush is arranged in the opening, the electric brush comprises a lead, the lead is connected with the lightning protection bracket, the brush box further comprises an elastic component, one end of the elastic component is connected with the bottom of the brush box, and the other end of the elastic component is connected with the bottom of the electric brush;

2. The lightning protection grounding device for yaw system as claimed in claim 1, wherein the connection ends of the brush box and the two ends of the conductive beam are rotatably connected, and the connection ends are provided with a rotation fixing device.

3. The yaw system lightning protection grounding device of claim 1, wherein the brush is a metal graphite carbon brush.

4. The lightning protection grounding device of the yaw system of claim 1, wherein the resilient member comprises a constant force spring and a spring bracket, the constant force spring being secured to the brush box by the spring bracket.

5. The lightning protection grounding device of yaw system of claim 1, wherein the connection end of the electrically conductive beam to the lightning protection bracket is provided with a grounding wire.

6. The lightning protection grounding device of yaw system as claimed in claim 1, wherein one end of the conductive beam comprises at least two of the brush boxes and the brushes, and at least two of the brush boxes located at the same side end of the conductive beam are connected in parallel.