Self-adaptation thrust bearing outer cycle cooling system of water pumping energy storage unit

Abstract

The invention discloses a self-adaptation thrust bearing outer cycle cooling system of a water pumping energy storage unit. The system has the functions that detection is automatic, and the system automatically adapts to bearing temperature increasing caused by the sudden situation of the energy storage unit within a certain range. The system comprises an industrial computer, a PLC, a data collecting device, a contactor, a temperature sensor, a pressure sensor, a flow sensor, a frequency converter, a motor pump unit and a cooler. Through analysis on data collected by the data collecting device, the running state is automatically selected, and when the bearing temperature is rapidly increased due to the sudden situation of the energy storage unit during running or the thrust bearing coolingsystem partially breaks down, the cooling system can automatically conduct switchover and adjust the cooling flow, the needed cooling flow is provided for a unit thrust bearing, continuous and stablerunning of the unit is guaranteed, and a new basis is provided for optimization design of the water wheel power generation thrust bearing.

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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