Motor driven centrifugal pump for primary circuit of small or medium modular reactor

摘要

The present invention relates to a motor driven centrifugal pump for circulating coolant in a primary circuit of a nuclear reactor. The motor-driven pump is a sealed motor unit (12), a hydraulic part (13), and a shaft (17) immersed in a coolant, which is rotated by the sealed motor unit (12) and the shaft ( 17) a shaft (17) for pumping coolant by means of an impeller (22) of a hydraulic part (13) fixed to 17), the motor unit (12) comprising a dried stator (18), And an immersed rotor (19) securely attached to the shaft (17). The motor driven pump is also a submerged flywheel securely attached to the shaft (17) between the rotor (19) of the motor unit (12) and the impeller (22) of the hydraulic part (13). (23) including an immersed flywheel (23) that allows for a minimized deceleration time after the power supply is cut off, the flywheel (23) causing the circulation of coolant. , Including a vaned wheel (40) that allows the motor unit (12) to be cooled.