Auxiliary water supply electric pump in nuclear power plant

Abstract

The invention relates to an auxiliary water supply electric pump in a nuclear power plant, which comprises a horizontal-structure multi-stage centrifugal pump provided with a pump body in a double shell type, wherein the inside of the pump body is provided with a multi-stage segmental inner shell. The inside of the multi-stage centrifugal pump is provided with a stator component, a rotor component, a balance mechanism component, a bearing component and a shaft seal component, wherein the lower part of the pump body is provided with a pump foot; the stator component is fixed on the pump body; the rotor component comprises a pump shaft, impellers and a balance drum; the balance mechanism component is fixed on the shaft and a pump cover; the bearing component comprises a radial roller bearingand a double-direction thrust ball bearing; and the bearing component is arranged on both ends of the pump body and on the periphery of the radial roller bearing and the double-direction thrust ballbearing respectively by adopting fast-loading mechanical seal. The auxiliary water supply electric pump adopts the double-cylinder structured pump body and the self-lubricating bearing; the balance drum is arranged on the shaft reasonably, and the radial roller bearing and the thrust ball bearing are arranged on both ends of the pump shaft respectively, so the auxiliary water supply electric pumphas no structural welding, has convenient maintenance, can effectively prevent a medium from leaking and polluting the environment, and the shock resistance and the maintainability of the pump are improved.

Description

Technical field: [0001] The invention relates to the field of machinery, in particular to fluid conveying machinery, in particular to pumps, and in particular to an electric pump for auxiliary feed water of a nuclear power plant. Background technique: [0002] Nuclear power plants use auxiliary feedwater pumps as backup pumps for steam generator main feedwater pumps or system water supply failures. For example, when the on-site power supply fails, the main water supply system pipeline or the main steam system pipeline is damaged, the auxiliary feed water pump will join the work. At the same time, under certain working conditions, the auxiliary feed water pump and its system also work instead of the main feed water pump and its system to discharge the heat released by the reactor. These working conditions are: 1. Unit start-up and heating of the reactor coolant system; 2. Thermal shutdown; 3. Cooling of the reactor coolant system to the extent that the waste heat removal sys...

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Problems solved by technology

[0003] The object of the present invention is to provide an electric auxiliary water supply pump for nuclear power plants. The electric auxiliary water supply pump for nuclear power plants needs to solve the inconvenient maintenance and heat resistance of electric auxiliary water supply pumps for nuclear power plants that adopt a single-shell multi-stage structure in the prior art. Shock, poor shock resistance, technical problems that require forced lubrication system to assist start-up

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