Startup water feed pump for nuclear power station

Abstract

The invention discloses a startup water feed pump for a nuclear power station, which comprises a stator component, a rotor component, two sets of mechanism seals, a mechanism sealing washing tube and a bearing component. The rotor component comprises a pump body and a balance water pipe, the rotor component comprises a pump shaft, an impeller, a middle sealing shaft sleeve, a rear sealing shaft sleeve and a shaft sleeve nut, and the bearing component comprises a front bearing, a rear bearing, a middle throttling bush and a rear throttling bush. The pump body is of an axial section structure and is divided into a lower pump body at the lower portion and an upper pump cover at the upper portion through a horizontal split, the lower pump body and the upper pimp cover are integrally connected through a plurality of press bolts, and an inner cavity of the pump body comprises a low pressure zone containing a first water pumping chamber, a second water pumping chamber, a third water pumping chamber, a fourth water pumping chamber and a fifth water pumping chamber and a high pressure zone containing a sixth water pumping chamber, a seventh water pumping chamber, an eighth water pumping chamber and a ninth water pumping chamber. The balance water pipe is connected between an inlet and an outlet which are arranged at the front portion and the rear portion of the pump body, the impeller is composed of nine levels of impellers, the two sets of mechanical seals are respectively arranged at the front end and the rear end of the pump body, and the mechanical sealing washing pipe is led out of an outlet of the first water pumping chamber to be respectively connected on the two sets of mechanical seals.

Description

technical field [0001] The invention relates to a start-up feed water pump for nuclear power plants. Background technique [0002] The start-up feed water pump for nuclear power plants is used to supply water to the steam generator during the start-up and normal shutdown of the reactor, without using the water source of the auxiliary water supply system, and to facilitate the flushing of the secondary circuit during start-up. There are following deficiencies in the existing starting feed water pump: [0003] 1) The structure of double cylinders and integral core pulling is adopted, so the structure of the pump body is complicated, and it is troublesome to disassemble and assemble the rotor parts when it is necessary to overhaul, which increases the maintenance workload; [0004] 2) Since the start-up feedwater pump is a horizontal multistage pump, the existing multistage pumps mostly use balance discs or balance drums to balance the axial force of the rotor components. The...

AI Technical Summary

Problems solved by technology

When repairing the mechanical seal, it is not only necessary to remove the bearing parts, but also to move the pump and motor, so that the replacement of the mechanical seal cannot be completed in a short time;

[0006] 4) The bearing adopts forced lubrication and is equipped with an external oil supply system to supply oil to the bearing. The external oil supply system includes an external oil pump, oil tank, cooler and pipelines, etc., which increases the complexity of the system and the source of failure and increases running costs

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