Stator component of charging pump for nuclear power station

Abstract

The invention discloses a stator component of a charging pump for a nuclear power station, which comprises a pump head, a barrel and a tail plate which are sequentially connected in back and forth direction. The barrel comprises an outer casing and an inner casing. The pump head comprises a main body portion which is of a circular structure and provided with an axial hole, an inlet hole and an outlet hole. An inner cavity of the outer casing comprises an inner casing cavity and a rear bearing cavity. The inner casing is of a radial subdivision structure and comprises a head plate, pump head lateral guiding fluid, a middle section, barrel lateral guiding fluid, a tail cover and a rear bearing cover which are sequentially connected in back and forth direction. After the head plate, the pump head lateral guiding fluid, the middle section, the barrel lateral guiding fluid and the tail cover are connected, complete cavities for containing impellers are arranged at intervals. The head plate is fixed on the rear end face of the pump head to enable the head plate, the pump head lateral guiding fluid, the middle section, the barrel lateral guiding fluid and the front half portion of the tail cover to be located in the inner casing cavity of the outer casing, and the rear half portion of the tail cover and the rear bearing cover are located in the rear bearing cavity of the outer casing and enable the rear end face of the rear bearing cover to have a free space with the front end face of the tail plate.

Description

technical field [0001] The invention relates to an upper charge pump for a nuclear power plant, in particular to a stator component of the upper charge pump for a nuclear power plant. Background technique [0002] The top charge pump is an important part of the chemical and volume control system (RCV), the main functions of the top charge pump are as follows: [0003] 1) Provide upfill water flow to the reactor coolant system to maintain the normal liquid level in the pressurizer; [0004] 2) Provide cooling water to the No. 1 seal of the three reactor coolant pumps, and this water flow also plays a role in preventing high-temperature coolant from leaking through the seal; [0005] 3) Used as a safety injection pump to prevent core exposure in loss of water events (LOCA). [0006] The charging pumps currently used in nuclear power plants are usually horizontal, double-casing multistage centrifugal pumps. The inner and outer casings of this structure are mostly integral st...

AI Technical Summary

Problems solved by technology

The inner and outer casings of this structure are mostly integral structures, and the inner casings are mostly fixed at both ends. When the pump is in a thermal transient condition, due to the sudden change in the temperature of the inner casing medium, the pump set, especially the inner casing, will be damaged. Due to thermal expansion and contraction, a certain displacement in the axial direction and other technical problems

In addition, the overall structure of the inner shell will cause the inner runner to be long, which makes it inconvenient to clean and polish the inner runner, and the overall casting is more difficult

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