Internal shell split centrifugal charging pump

Abstract

The invention relates to an internal shell split centrifugal charging pump. When a reactor runs normally, the pump runs under a charging working condition to provide boric acid-containing charging water for a loop and provide shaft seal water for mechanical seal for a main pump; and when coolant loss accidents such as breakage and the like occur in the main loop of the reactor, the charging pump runs under a high-pressure safety injection working condition and injects water to the reactor to prevent the accident from further expanding and ensure the safety of the reactor. The internal shell split centrifugal charging pump mainly comprises an external cylinder body, an internal shell, a water inlet pipeline, a water outlet pipeline, a bracket part, a left-side end cover, a right-side end cover, an intermediate bearing, a shaft, an impeller, a first double suction impeller, a guide vane, a middle flow channel, a final water outlet flow channel, an axle bumper, a left-end double seal ring structure, a right-end seal structure and the like. The internal shell split centrifugal charging pump is reasonable in design and high in thermal shock resistance and completely meets the requirements of a nuclear power station chemical and volume control system in hydraulic design and strength design.

Description

technical field [0001] The invention relates to a fluid machine, in particular to a centrifugal top-charging pump with a split inner shell. Background technique [0002] The pressurized water reactor nuclear power plant is a nuclear reaction power plant widely used at present, and the top charge pump is the main equipment of the primary loop chemical and volume control system of the nuclear power plant. When the reactor is in normal operation, the pump operates under the top-fill condition, providing boric acid-containing top-fill water for the primary circuit, and at the same time providing mechanically sealed shaft seal water for the main pump; when the reactor main circuit loses water such as a breach In the event of an accident, the top charge pump operated under high-pressure safety injection conditions to inject water into the reactor to prevent further expansion of the accident and ensure the safety of the reactor. [0003] The working temperature of the pump is 7°C ...

AI Technical Summary

Problems solved by technology

[0004] Existing commonly used pumps cannot meet the requirements of chemical and volume control systems and high-pressure safety injection systems of nuclear power plants in terms of stiffness, strength, thermal shock resistance, resistance to impurities in the working medium, sealing performance, and material properties.

Images