External motor cooling system of permanent-magnet direct-drive medium-speed coal mill

By introducing an external lubricating oil cooling system into the permanent magnet direct-drive medium-speed coal mill, the problem of bearing temperature rise was solved, and continuous circulation cooling of lubricating oil was achieved, thereby improving the reliability and operational stability of the equipment.

CN223511353UActive Publication Date: 2025-11-04ZHEJIANG ZHENENG ZHONGMEI ZHOUSHAN COAL & ELECTRICITY CO LTD
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Patent Information

Application Number
CN202520288636.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-21
Publication Date
2025-11-04
Estimated Expiration
2035-02-21

AI Technical Summary

Technical Problem

The bearing temperature of the permanent magnet direct drive medium-speed coal mill rises, especially in high-temperature environments where the oil temperature self-cools slowly, leading to frequent high bearing temperature alarms and posing a risk of oil failure due to high temperature during long-term operation.

Method used

An external lubricating oil cooling system was designed, including a thrust bearing oil trough, an oil sump, and an external lubricating oil cooling system. The system is connected to a cooler through an oil drain hole and an oil filling hole. The system utilizes an independent oil pump and an electric motor to achieve circulating cooling of the lubricating oil. A tubular cooler is used to remove heat. The system is combined with a level gauge and valves for real-time monitoring and maintenance.

Benefits of technology

It effectively reduced bearing temperature, decreased equipment downtime for maintenance, improved equipment reliability and operational stability, and prevented oil failure due to high temperatures.

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Abstract

The utility model relates to an external motor cooling system of a permanent-magnet direct-drive medium-speed coal mill. The external motor cooling system comprises a thrust bearing oil groove, an oil pool groove and an external lubricating oil cooling system, the thrust bearing oil groove and the oil pool groove are both connected with the external lubricating oil cooling system, and are both provided with an oil drainage hole and an oil filling hole; lubricating oil in the thrust bearing oil groove and the oil pool groove is pumped out from the oil drainage hole, cooled by the external lubricating oil cooling system and then pumped back to the thrust bearing oil groove and the oil pool groove through the oil filling hole. The lubricating oil cooling device has the advantages that an external lubricating oil cooling system is installed through the oil filling hole and the oil discharging hole, and lubricating oil is directly pumped out from the oil discharging hole through an independent oil pump, cooled through the cooler and then pumped back to a bearing oil cavity through the oil filling hole. The cooler is a tubular cooler, heat is taken away by cooling water, lubricating oil is cooled by the cooler and then sent back into the machine body, and continuous circulating cooling is achieved.
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