Water pump for factory for nuclear power station

Abstract

The invention discloses a water pump for a factory for a nuclear power station, which comprises a pump body, a rotor member, a machine seal, a machine seal flushing pipeline and a bearing member. The pump body comprises an inlet loudspeaker, a pump shell, a joint pipe, an outlet elbow, a pump base, a pump cover and a motor base; the rotor member comprises a pump shaft, an impeller and an impeller nut. The pump shell is composed of a primary pump shell group, a secondary pump shell group and a final pump shell group which are connected in series orderly from bottom to top. Each pump shell group is composed of a joint shell and a flow guiding shell connected to the upper end of the joint shell; the lower end of a primary joint shell is connected with the inlet loudspeaker, the upper end of a final flow guiding shell is connected with the joint pipe. The machine seal device is a cartridge mechanical seal, and the machine seal device is installed on the pump shall at the upper part of the pump cover. The machine seal flushing pipeline comprises a water inlet pipeline and a water outlet pipeline. The bearing part comprises pilot bearings arranged between the inlet loudspeaker and the pump shaft, between the primary pump shell group and the pump shaft, between the secondary pump shell group and the pump shaft and between the final pump shell and the pump shaft.

Description

technical field [0001] The invention relates to a plant water pump used in nuclear power plants, in particular to a plant water pump used in nuclear power plants. Background technique [0002] The working medium of plant water pumps used in nuclear power plants is sandy sea water. The main function of important plant water pumps in nuclear power plants is to transfer the liquid heat transferred from the equipment cooling water system to seawater, or to pump seawater to cool the equipment cooling water. As the ultimate heat sink of the nuclear island, its importance is self-evident. [0003] The plant water pump of the AP1000 nuclear power plant is a vertical, long-axis centrifugal pump. The pump body is composed of many parts, so there are generally errors in the axial processing and installation; for the long-axis pump with general structure, the impeller rotor parts must be disassembled to pull the rotor parts at the lower part of the pump. It is very unfavorable for on...

AI Technical Summary

Problems solved by technology

The plant water pump of the existing structure adopts a single-stage impeller, so the diameter of the impeller is relatively large, and the linear velocity at the outlet of the impeller is relatively high, resulting in a weak resistance to high-sand medium erosion, and radial Vibration phenomenon, the radial vibration of the lower part is especially serious

In addition, the mechanical seal of the vertical long-axis pump generally adopts the packing seal. Although the packing seal is easy to repair and replace, its sealing performance is not as good as the mechanical seal, so it cannot meet the requirements of the plant water pump.

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