Nuclear power main pump flywheel with overspeed protection function

Abstract

The invention provides a nuclear power main pump flywheel with an overspeed protection function. The nuclear power main pump flywheel comprises a rotary shaft, a shaft sleeve and a flywheel body. The shaft sleeve is fixed to the rotary shaft, annular roller paths are arranged in the side wall of the shaft sleeve, and rolling bodies are arranged on the annular roller path. The flywheel body is arranged outside the shaft sleeve in a sleeved mode. Annular supporting parts are arranged on the inner wall of a center hole of the flywheel body, the end faces of the annular supporting parts are attached to the rolling bodies, and the inner wall of the center hole is in interference fit with the outer wall of the shaft sleeve. When rotation speed is normal, the nuclear power main pump flywheel with the overspeed protection function is driven to rotate depending on the friction force of interference fit; when rotation speed is over high, the inner diameter of the flywheel body becomes large under the action of centrifugal force and is separated from the shaft sleeve, and after separation, the flywheel body is supported through the rolling bodies and continues to rotate under the action of inertia, so that the rotation speed of the flywheel is reduced, and the flywheel plays a role in overspeed protection.

Description

technical field [0001] The invention relates to a structure of a flywheel assembly of an electric main pump, in particular to a flywheel of a nuclear power main pump with an overspeed protection function. Background technique [0002] As the only uninterrupted power source of the nuclear island and the only rotating equipment of the reactor nuclear island, the nuclear main pump has withstood the test of various extreme working conditions during the ultra-long service time. The long-term stable and safe operation of the nuclear main pump is extremely important for cooling the core and preventing the occurrence and deterioration of nuclear power plant accidents. The premise of safe operation is to manufacture the main pump suitable for the long-term operation of the working condition. At present, my country is in the process of independent research and development of nuclear main pumps. The purpose of installing a flywheel on the shaft of the nuclear main pump motor is to en...

AI Technical Summary

Problems solved by technology

Due to the possibility of accidental overspeed in the operation of the main pump, the flywheel is likely to rupture. If the broken fragments destroy the pressure boundary of the circuit, the consequences will be unimaginable

During the earthquake, the main pump is required to be able to idle normally. Once a shaft stuck accident occurs, the residual heat of the core cannot be taken out, and the consequences are very serious.

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