CN218997318U

CN218997318U - Insulation performance enhanced type grounding brush frame pillar structure of wind driven generator

Info

Publication number: CN218997318U
Application number: CN202222396434.0U
Authority: CN
Inventors: 周杰; 林鸿辉; 陈钰; 蔡军
Original assignee: Zhejiang Windey Co Ltd
Current assignee: Zhejiang Windey Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2023-05-09
Anticipated expiration: 2032-09-07

Abstract

The utility model belongs to the technical field of grounding brush frames, and particularly relates to a grounding brush frame support structure with enhanced insulation performance of a wind driven generator. Compared with the prior grounding brush frame fixing support, the support structure of the grounding brush frame with the enhanced insulating property of the wind driven generator adopts the epoxy resin casting technology, so that the distance between the outer cover of the bearing of the wind driven generator and the brush frame is increased, the creepage distance is increased, and the widened insulating sheets can better isolate carbon powder accumulation and generate creepage, so that the possibility of bearing electric erosion fault is greatly reduced; the service life of the generator bearing is effectively prolonged, and powerful guarantee is provided for the reliable operation of the wind turbine generator.

Description

Insulation performance enhanced type grounding brush frame pillar structure of wind driven generator

Technical Field

The utility model relates to a supporting column structure of an insulation performance enhanced grounding brush frame of a wind driven generator. Belongs to the technical field of wind power.

Background

In the current general trend of global carbon neutralization, wind power generation is increasingly paid attention to as a pure green renewable energy source, and a generator is used as a core component of a wind turbine unit, so that the position is of great importance. But in the running process, the bearing of a plurality of generators is found to have faults when running for less than 2 years, and when running, the bearing has serious abnormal sound and abnormal vibration, and the bearing is disassembled, so that the bearing can be found that obvious washboard lines exist on the inner ring and the outer ring of the bearing. For this reason, we find that there is a lot of carbon powder accumulation at the grounding brush frame to generate creepage.

And the fixed support of the generator grounding brush frame is of a split structure, the creepage distance of the fixed support held by the grounding brush is too short, and carbon powder is easy to accumulate and pollute after the generator set runs for a long time, so that creepage is generated.

The function of the grounding brush frame for the wind driven generator is as follows: the shaft current of the rotating shaft of the generator is led to the ground, so that the shaft current does not flow through the bearing, and the bearing electric corrosion fault is caused. However, the distance between the outer cover of the generator and the brush holder is too short, after carbon powder is worn and accumulated, loops are formed on the bearing and the outer cover of the bearing, so that after a lubricating oil film is broken through by shaft current, the bearing is electrically corroded, obvious rubbing patterns appear, and the service life of the bearing is greatly reduced.

Compared with the prior grounding brush frame, the novel structure adopts the epoxy resin casting technology, increases the distance between the outer cover of the generator bearing and the brush frame, increases the creepage distance, and widens the insulating sheet, so that carbon powder can be better isolated from accumulation, creepage is generated, and the possibility of bearing electric corrosion fault is greatly reduced.

Disclosure of Invention

The utility model provides a wind driven generator insulation performance enhanced grounding brush frame support structure which adopts an epoxy resin pouring technology, increases the distance between an outer cover of a generator bearing and a brush frame, increases the creepage distance, and widens an insulation sheet, can better isolate carbon powder accumulation, generates creepage, greatly reduces the possibility of bearing electric erosion fault occurrence, and solves the problems of poor insulation performance of a common generator grounding brush frame fixing support, short distance between the outer cover of the bearing and the brush frame, easiness in accumulation of carbon powder, occurrence of creepage, occurrence of shaft current fault of the bearing and serious influence on the generating capacity of a unit in the prior art.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

the utility model provides a aerogenerator insulating properties enhancement mode ground connection brush frame pillar structure, includes bearing enclosing cover and ground connection brush frame, bearing enclosing cover and ground connection brush frame pass through ground connection brush frame pillar fixed connection, strengthen ground connection brush frame insulating properties, increase ground connection brush frame and the creepage distance between the bearing enclosing cover, ground connection brush frame pillar includes the screw rod, overlaps establish screw rod one end and by epoxy integrated into one piece's insulating pillar, install fixation nut on the screw rod with be in between insulating pillar and the fixation nut and be used for preventing the carbon dust to drift accumulational isolation pad. The grounding brush frame support is formed by casting epoxy resin, has excellent electrical property and mechanical property, increases creepage distance, and the widened isolation sheet can better prevent carbon powder from drifting and accumulating on the fixed support. Can prevent that carbon dust from piling up the back on the fixed column, produce the creepage, the axle electric current produces the return circuit between bearing and bearing enclosing cover, produces the electrolytic corrosion to the bearing, appears obvious rubbing board line, reduces bearing life.

The shape of the fixing nut is regular hexagon, so that the tower is convenient to assemble and disassemble, the isolation gasket is of a phi 36 circular structure, and the diameter of the isolation gasket can be increased.

The insulating support column is in a phi 18 cylinder shape and is used for installing and fixing the grounding brush frame.

The grounding brush frame support is installed on the grounding ring.

And the side edge of the grounding brush frame is also provided with a constant-pressure spring.

According to the structure of the support column of the grounding brush frame with the enhanced insulation performance of the wind driven generator, the epoxy resin casting technology is adopted, so that the distance between the outer cover of the bearing of the wind driven generator and the brush frame is increased, the creepage distance is increased, and the widened insulation sheets can better isolate carbon powder accumulation and generate creepage, so that the possibility of bearing electric erosion fault is greatly reduced; the service life of the generator bearing is effectively prolonged, and powerful guarantee is provided for the reliable operation of the wind turbine generator.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic structural view of a post structure of an insulation performance enhanced grounding brush holder of a wind driven generator according to the present utility model;

FIG. 2 is a perspective view of a post structure of a grounding brush holder with enhanced insulation performance for a wind driven generator according to the present utility model;

FIG. 3 is a schematic view of a grounding brush holder in a post structure of an enhanced insulation grounding brush holder for a wind turbine according to the present utility model;

FIG. 4 is a schematic view illustrating the installation of a grounding brush holder in a post structure of an enhanced insulation grounding brush holder for a wind turbine according to the present utility model;

FIG. 5 is a graph of characteristic frequency of shaft current faults of a grounding brush holder in a post structure of an insulation performance enhanced grounding brush holder of a wind driven generator.

In the figure, a 1-fixing nut; 2-isolating gaskets; 3-insulating supports; 4-grounding brush holders; 5-constant pressure springs; a 6-ground ring; 7-bearing covers.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Referring to fig. 1-4, an insulation performance enhanced type grounding brush frame pillar structure of a wind driven generator comprises a bearing outer cover 7 and a grounding brush frame 4, wherein the bearing outer cover 7 and the grounding brush frame 4 are fixedly connected through the grounding brush frame pillar, the grounding brush frame pillar comprises a screw rod and an insulation pillar 3 which is sleeved at one end of the screw rod and is integrally cast and formed by epoxy resin, the insulation pillar 2 is excellent in insulation capability, the creepage distance is increased, and a fixing nut 1 arranged on the screw rod and an isolation gasket 2 which is arranged between the insulation pillar 3 and the fixing nut 1 and is used for preventing carbon powder from drifting and accumulating. The grounding brush frame support is formed by casting epoxy resin, has excellent electrical property and mechanical property, increases creepage distance, and the widened isolation sheet can better prevent carbon powder from drifting and accumulating.

The shape of fixation nut 1 is regular hexagon, makes things convenient for dismouting on the tower, fixation nut 1 adopts regular hexagon M8 model, installs on bearing enclosing cover 7, isolation gasket 2 is phi 36 circular structure, and of course the diameter also can increase, can initiatively reduce the carbon dust and pile up after widening the thickening.

The insulating support 3 is in a phi 18 cylindrical shape and is used for installing and fixing the grounding brush holder 4. The integral grounding brush holder 4 is fixed on the bearing outer cover 7 through the insulating support 3. The grounding brush holder support is mounted on the grounding ring 6. The side of the grounding brush frame is also provided with a constant-pressure spring 5.

Overall, the grounding brush frame support of the epoxy casting structure is simple in structure, good in insulating property, convenient to install and carry, low in cost and capable of protecting the bearing well, avoiding being damaged by shaft current, effectively prolonging the service life of the bearing and providing powerful guarantee for reliable operation of the wind turbine generator.

Referring to fig. 5, a project is selected to perform a rectifying test on site, and through operation observation, the vibration data of the 2-unit generator bearing CMS are checked to find that the vibration trend of the bearing is stable after rectifying, and the characteristic frequency of shaft current faults is not found in the frequency spectrum.

The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to 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 utility model, and yet fall within the scope of the utility model.

Claims

1. The utility model provides a aerogenerator insulating properties enhancement mode ground connection brush frame pillar structure, includes bearing enclosing cover and ground connection brush frame, its characterized in that: the bearing outer cover is fixedly connected with the grounding brush frame through a grounding brush frame support column, and the grounding brush frame support column comprises a screw rod, an insulating support column which is sleeved at one end of the screw rod and integrally cast by epoxy resin, a fixing nut arranged on the screw rod and an isolation gasket which is arranged between the insulating support column and the fixing nut and used for preventing carbon powder from drifting and accumulating.

2. The insulation performance-enhanced grounding brush holder post structure of a wind turbine according to claim 1, wherein: the shape of the fixing nut is regular hexagon, and the isolation gasket is in a phi 36 circular structure.

3. The insulation performance-enhanced grounding brush holder support structure for a wind turbine according to claim 1 or 2, wherein: the insulating support post is phi 18 cylindrical.

4. The insulation performance-enhanced grounding brush holder post structure of a wind turbine according to claim 1, wherein: the grounding brush frame support is installed on the grounding ring.

5. The insulation performance-enhanced grounding brush holder post structure of a wind turbine according to claim 1, wherein: and the side edge of the grounding brush frame is also provided with a constant-pressure spring.