External-circulation cooling system for self-adaptation thrust bearing of pump storage group

Abstract

The invention discloses an external-circulation cooling system for the self-adaptation thrust bearing of a pump storage group. The system is capable of achieving automatic detection and automaticallyadapting to bearing temperature rising caused by the emergency of the pump storage group in a certain range. The system comprises an industrial computer, a PLC device, a data collecting device, a contactor, a temperature sensor, a pressure sensor, a flow sensor, a frequency converter, a motor pump set and a cooling device. The system has the advantages that the system automatically selects an operation state by analyzing data collected by the data collecting device; when the temperature of the bearing rises excessively fast due to the emergency in the operation of the pump storage group or when the thrust bearing cooling system has a partial fault, the cooling system can actively switch and regulate cooling flow to provide needed cooling flow for the thrust bearing so as to guarantee thatthe pump storage group operates continuously and stably, and a new basis is provided for the optimal design of the thrust bearing of water turbine power generation.

Description

Technical field: [0001] The invention relates to an external circulation cooling system for an adaptive thrust bearing of a pumped storage unit. Background technique: [0002] The thrust bearing of the hydro-generator is the key component that bears the weight of the unit and connects the turbine and the generator. During the operation of the unit, a large amount of heat will be generated due to friction, and a reasonable external circulation cooling system is needed for cooling to ensure the continuous stability of the unit. running. The speed of the pumped-storage unit is 4 to 6 times that of the conventional hydro-generator unit, which requires higher stability of the cooling system. In the traditional hydro-generator thrust bearing cooling system, the motor-pump unit is started by a soft starter, and the The circulating suction generated by the motor pump unit cools the hot oil of the thrust bearing. Since the motor pump unit rotates at a fixed speed, the flow rate of t...

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Problems solved by technology

The speed of the pumped-storage unit is 4 to 6 times that of the conventional hydro-generator unit, which requires higher stability of the cooling system. In the traditional hydro-generator thrust bearing cooling system, the motor-pump unit is started by a soft starter, and the The circulating suction generated by the motor pump unit cools the hot oil of the thrust bearing. Since the motor pump unit rotates at a fixed speed, the flow rate of the cooling oil cannot be adjusted, and the cooling capacity cannot be increased when the bearing temperature rises too fast. Therefore, most cooling system designs The flow rate is often too large, resulting in more air bubbles in the pipeline, increasing the vibration and noise of the bearing cooling system, and greatly reducing the service life of the bearing cooling system. Moreover, the traditional bearing cooling system does not have the function of automatic judgment. In the thrust bearing cooling system, the motor When the pump set fails, or when the energy storage unit encounters an unexpected situation in the operation and the bearing temperature rises too fast, the system itself cannot actively switch and adjust the cooling flow, and the unexpected situation can only be discovered when the unit bearing temperature reaches the alarm shutdown

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