Lubricating oil supply system with independent direct-current power supply systems and without emergency oil pump

Abstract

The invention provides a lubricating oil supply system with independent direct-current power supply systems and without an emergency oil pump. A first oil supply module comprises a first alternating-current power supply, a first rectifier, the first direct-current power supply system, a first inverter, a first motor and a first main oil pump which are sequentially connected from the inlet end to the outlet end. A second oil supply module comprises a second alternating-current power supply, a second rectifier, the second direct-current power supply system, a second inverter, a second motor anda second main oil pump which are sequentially connected from the inlet end to the outlet end. The outlet ends of the first and second oil supply modules are combined and then connected with the inletend of a lubricating oil processing module. The inlet end of the lubricating oil processing module is provided with an accident switching valve. It is ensured that supply of lubricating oil is not interrupted, so that the operation stability of a generator set can be improved, the probability and risks of shafting damage of the generator set are reduced, the running time of the generator set is prolonged, and economic and social benefits are further improved.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a lubricating oil supply system with an independent DC power supply system and no emergency oil pump. Background technique [0002] The generator set in a thermal power plant is a high-speed rotating mechanical device during power generation operation. The joints of the supporting bearings and thrust bearings and the high-speed friction parts require a large amount of oil to lubricate and cool. As the oil supply system for the generator set to provide lubricating oil, even a brief interruption will cause serious damage to the generator set equipment, so the continuous and stable operation of the lubricating oil system must be guaranteed. [0003] At present, there are two main types of lubricating oil supply systems for generating units in thermal power plants: [0004] System 1: A start / stop oil pump driven by an AC motor + a coaxial working oil pump on the main shaft of...

AI Technical Summary

Problems solved by technology

[0007] The DC motors driving the emergency oil pump in the above system 1 and system 2 have certain shortcomings: due to the structure of the DC motor, the commutator (also called "commutator") on the motor has the problem of wear on the one hand, and on the other hand On the one hand, it generates a lot of heat during operation, and it is easy to form a "ring fire"

There is also a serious disadvantage for system 2, which must be started quickly in the event of an accident, otherwise the supply of lubricating oil may be interrupted, which will endanger the safety of the shafting of the generator set

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