Large shaft grounding device

By introducing a conductive substrate layer and a low contact resistance layer into the main shaft grounding device, combined with constant pressure loading and lubrication cooling mechanism, the problem of poor grounding effect was solved, and efficient conduction of static charge and reduction of electrolytic pits were achieved.

CN224418992UActive Publication Date: 2026-06-26CHINA GENERAL NUCLEAR POWER OPERATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHINA GENERAL NUCLEAR POWER OPERATION
Filing Date
2025-05-15
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

The existing shaft grounding device has poor grounding effect, with low contact stress, small contact area, and easy wear, which leads to increased grounding resistance, inability to effectively conduct static charge, and increased risk of electrolytic pitting.

Method used

The design incorporates a fixed fixture, a constant pressure loading mechanism, and a grounding slipper. The grounding slipper consists of a conductive substrate layer and a low contact resistance layer. The constant pressure loading mechanism maintains stable contact, and the combination of an oil dripping and cooling mechanism optimizes the contact area and resistance, thereby improving conductivity.

Benefits of technology

It improves grounding effectiveness, reduces static charge accumulation, lowers the risk of electrolytic pitting, extends the service life of the device, and is suitable for a wide range of shaft voltages.

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Abstract

The application relates to the field of generator set operation and maintenance, and provides a large shaft grounding device, which comprises a fixing tool, a grounding wire, a constant-voltage loading mechanism and a grounding shoe. The grounding shoe comprises a conductive base layer and a low-contact-resistance layer which are sequentially stacked. The conductive base layer is connected with the grounding wire. The constant-voltage loading mechanism is connected between the fixing tool and the conductive base layer. The side surface of the low-contact-resistance layer opposite to the conductive base layer is an arc surface and is used for abutting against the surface of the large shaft. Based on the above structure, the electrostatic charge of the large shaft can be preferentially led away through the path of the low-contact-resistance layer, the conductive base layer and the grounding wire, the grounding effect of the large shaft grounding device on the large shaft can be effectively improved, the charge leading effect of the large shaft grounding device can be effectively improved, the accumulation of electrostatic charge to form a suspended potential can be effectively and reliably hindered, the shaft voltage can be reduced, the risk of the breakdown discharge phenomenon can be reduced, and the risk of the electric corrosion of the bearing caused by the current passing through the bearing can be reduced.
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