CN212535943U

CN212535943U - Main shaft lightning grounding device

Info

Publication number: CN212535943U
Application number: CN202020484969.1U
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: 2021-02-12
Anticipated expiration: 2030-04-03

Abstract

The utility model discloses a main shaft lightning protection grounding 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 lightning protection bracket comprises an extension beam, the extension beam is perpendicular to the lightning protection bracket, the brush box is obliquely connected with the end part of the extension beam, the brush box is provided with an opening, and the opening faces to the normal direction of the extension beam in the extension direction; the electric brush is placed in the opening; 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 number of the brush boxes is at least one. The technical effect of the utility model lies in that simple structure, compact practicality, the mounted position is adjusted conveniently, the wheel hub main shaft of the multiple model of adaptation simultaneously.

Description

Main shaft lightning grounding device

Technical Field

The utility model relates to a fan power generation field especially relates to a main shaft 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 fan, a professional lightning protection grounding device is required to be configured to effectively conduct lightning current, so as to avoid damage to fan components, such as direct guiding of blade root current to a hub, direct guiding of current of the main shaft to a busbar, and guiding of the current of the main shaft to the ground through a tower cylinder from the busbar, so as to avoid breakdown of the main shaft by high voltage and high current caused by lightning and damage to the main shaft.

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 main shaft.

In order to achieve the above object, the utility model provides a main shaft lightning protection grounding device, including brush box, brush and lightning protection support, the lightning protection support includes the extension beam, the extension beam is perpendicular with the lightning protection support, the brush box is connected with the end of the extension beam aslant, the brush box has an opening, the opening is towards the normal direction of the direction that the extension beam extends; the electric brush is placed in the opening; the electric brush comprises a lead, and the lead 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 number of the brush boxes is at least one.

Further, the brush box with the link swivelling joint of extension roof beam, the link is provided with rotatory fixing device.

Further, the number of the brush boxes and the number of the electric brushes are at least two, the at least two electric brushes are connected in parallel, and the at least two brush boxes are connected with each other and are arranged on the same side of the cantilever beam.

Furthermore, the number of the brush boxes and the number of the electric brushes are at least two, the at least two electric brushes are connected in parallel, and at least one brush box is arranged on two sides of the cantilever beam.

Furthermore, the conductive backing plate is connected with the lightning protection support, and the lead is fixed on the conductive backing plate.

Further, the conductive backing plate is made of copper.

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.

The technical effect of the utility model lies in that simple structure, compact practicality, the mounted position is adjusted conveniently, the wheel hub main shaft of the multiple model 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;

fig. 2 is another 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-an extension 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, a spindle lightning protection grounding device comprises a brush box 2, an electric brush 1 and a lightning protection bracket 3, wherein the lightning protection bracket 3 comprises an extension beam 4, the extension beam 4 is perpendicular to the lightning protection bracket 3, the brush box 2 is obliquely connected with the end part of the extension beam 4, the brush box 2 is provided with an opening 7, the opening 7 faces the normal direction of the extension beam 4, the electric brush 1 is placed in the opening 7, the electric brush 7 comprises a wire, and the wire is connected with the lightning protection bracket 3; the brush box 2 also comprises an elastic component 6, one end of the elastic component 6 is connected with the bottom of the opening 7, and the other end of the elastic component 6 is connected with the bottom of the electric brush 1; the brush box 2 is at least one.

The lightning protection support 3 is fixed on a main shaft hub of the fan through a hexagon bolt M8X25, the lightning protection support 3 can be a plane metal piece or a bent metal piece, and the lightning protection support 3 is only required to be connected on the hub in a fastening mode and is not limited here. Lightning protection support 3 fastens the back, and extension beam 4 should extend to the main shaft, is connected in the opening of the brush box 2 of extension beam 4 towards the main shaft, brush 1 and the main shaft butt of 2 inside brushes of brush box, and the wire of carbon brush 1 is connected with lightning protection support 3 for transmit lightning current. 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 conducting wire of the electric brush 1 leads the lightning current to the lightning protection bracket 3, the lightning protection bracket 3 is connected with the grounding wire, and the lightning current is transmitted to the ground through the grounding wire. Therefore, the lightning current flows along the new external channel without passing through the fan main shaft, so that the normal operation of the main shaft 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 brush box 2 is rotatably connected with the connecting end of the extension beam 4, and the connecting end is provided with a rotary fixing device 8.

Because the main shaft is cylindric usually, and the main shaft of different specifications, its radius is also different, has caused lightning protection earthing device adaptation face narrow from this, the loaded down with trivial details problem of design, consequently changes brush box 2 and extension beam 4's link 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, and the brush box 2 is fixed by the rotating and fixing device 8 at a proper angle, so that the electric brush 1 is fully abutted against the main shaft.

Further, the brush box 2 and the brush 1 are at least two, and the plurality of brushes 1 are connected in parallel. The parallel connection of the brushes 1 can further reduce the resistance and increase the current-bearable range of the lightning protection grounding device. According to the specification of the actual main shaft, the brush boxes 2 can be arranged on the same side of the extension beam 4, and can also be arranged on two sides of the extension beam 4 respectively.

Further, still include: the conductive backing plate 5 is connected with the lightning protection bracket 3 through a hexagon bolt M10X40 and a hexagon nut M10. The conductive pad 7 further increases the lightning current transmission speed, and the conductive pad 7 is generally made of copper due to the combination of cost and conductive property. In addition, other pads with stronger conductive properties may also be selected.

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 metals mainly containing copper, generally in an amount of 95%. According to the IEC 61400-24 standard, the lightning protection grounding device should withstand at least 200KA of lightning current.

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 fixed in position, the brush 1 is pressed against the spindle by a constant force spring 62. In addition, the brush 1 is worn during the friction between the spindle and the brush 1, and the brush 1 deformed by the wear is still firmly abutted against the spindle by the constant force spring 62.

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 main shaft lightning protection grounding device is characterized by comprising a brush box, an electric brush and a lightning protection bracket, wherein the lightning protection bracket comprises an extension beam, the extension beam is perpendicular to the lightning protection bracket, the brush box is obliquely connected with the end part of the extension beam, and the brush box is provided with an opening which faces the normal direction of the extension beam in the extending direction; the electric brush is placed in the opening; the electric brush comprises a lead, and the lead is connected with the lightning protection bracket;

the number of the brush boxes is at least one.

2. The lightning protection grounding device for main shafts according to claim 1, wherein the brush box is rotatably connected with the connecting end of the extension beam, and the connecting end is provided with a rotary fixing device.

3. The lightning protection grounding device for a spindle of claim 1, wherein said brush boxes and said brushes are at least two, at least two of said brushes are connected in parallel, and at least two of said brush boxes are connected to each other and disposed on the same side of said extension beam.

4. The lightning protection grounding device for a spindle of claim 1, wherein said brush box and said brush are at least two, at least two of said brushes are connected in parallel, and at least one of said brush boxes is disposed on both sides of said extension beam.

5. The lightning protection grounding device for a spindle of claim 1, further comprising: the lightning protection support is connected with the lightning protection support, and the conducting wire is fixed on the conducting backing plate.

6. The lightning protection grounding device for a spindle of claim 5, wherein said electrically conductive backing plate is copper.

7. The lightning protection grounding device for main shafts according to claim 1, wherein said brushes are metal graphite carbon brushes.

8. The lightning protection grounding device for a spindle according to claim 1, wherein the elastic member comprises a constant force spring and a spring support, and the constant force spring is fixed to the brush box through the spring support.