A Self Cooling Electric Auxiliary Feed Water Pump

Abstract

The invention discloses a self-cooling electric auxiliary water feeding pump. The self-cooling electric auxiliary water feeding pump comprises a pump seat assembly, a barrel body and a core cladding assembly, wherein the barrel body is arranged above the pump seat assembly; an inlet composed of an inlet flange and an outlet composed of an outlet flange are formed in the top of the barrel body; the core cladding assembly is arranged in the barrel body and comprises a rotor assembly. The rotor assembly comprises a pump shaft, one end of the pump shaft is a driving end, the other end of the pump shaft is a non-driving end, and the driving end and the non-driving end of the pump shaft are provided with a water inlet chamber and a pump cover which are connected with the barrel body in a sealed mode. The rotor assembly further comprises multiple stages of impellers and multiple stages of middle sections arranged on the pump shaft and between the water inlet chamber and the pump cover, and each middle section is arranged at an outlet of the corresponding stage of impeller. A balance drum is further arranged between the pump shaft and the pump cover and connected with the last stage of impeller in an abutting mode. The self-cooling electric auxiliary water feeding pump can effectively improve the anti-cavitation performance and reduces influences of deflection on safe operation.

Description

technical field [0001] The invention relates to the technical field of nuclear power equipment, in particular to a self-cooling electric auxiliary water feed pump. Background technique [0002] As an important nuclear-grade pump in a nuclear power plant, the electric auxiliary feedwater pump plays an important role in the entire system. Its safety functions are as follows: 1. When any part of the main water supply system fails, the auxiliary feedwater pump and its system will be put into operation immediately, and as an emergency means, water will be supplied to the secondary circuit side of the evaporator, and the residual heat of the core will be discharged until the residual heat removal system put into service. 2. When the unit is started, the reactor coolant system is heated, the reactor is thermally shut down, and the core heat is discharged, the auxiliary feed water pump and its system replace the main feed water pump and its system to work to discharge the heat rele...

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Problems solved by technology

[0003] The auxiliary feed water pump in the prior art is complex in structure and troublesome to maintain. Any failure of any link in the complex and cumbersome system will have an impact on the safe operation of the equipment. In view of the above-mentioned safety effects, it is necessary to repair Make improvements to meet security needs

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