Disassembly and assembly of the motor flywheel of the shaft seal main pump of the nuclear power plant

Abstract

The invention relates to a process for disassembling and assembling the flywheel of the shaft seal main pump motor of a nuclear power plant. At room temperature, the shaft 2 is vertically hoisted into the inner hole of the inner sleeve 5 of the flywheel and gently dropped until the outer diameter of the shaft 2 is in contact with the flywheel 3. There is no gap in the contact of the inner hole, and the distance between the F surface of the flywheel inner sleeve 5 and the E surface of the shaft 2 is measured by a gauge block, which is recorded as the A value. Under the action of the oil film, the stress of the shrink sleeve can be completely released. At the same time, based on the 1:10 taper fit between the flywheel and the shaft, the axial displacement of the flywheel is 10 units, and the interference will change by 1 unit. By controlling the oil pressure and oil volume The technology can precisely control the axial micro-movement of the flywheel, and then control the micro-adjustment of the flywheel interference. The invention achieves relatively high adjustment accuracy. By using this method, the axial position deviation of the flywheel is adjusted to ±0.15mm, and the interference deviation is ±0.015mm, which not only solves the harmful residual stress, but also ensures the installation accuracy.

Description

Technical field: [0001] The invention relates to a process for disassembling and assembling a flywheel of a shaft seal main pump motor of a nuclear power plant for pumping oil. Background technique: [0002] The shaft seal main pump motor rotor flywheel of the nuclear power plant is a nuclear first-class component, which is related to the safe operation of the nuclear power plant. Its function is to store inertial energy. Once a power failure occurs, the main pump rotor can still run for a certain period of time in the initial critical period relying on inertia. Quickly adopt emergency plans to provide guarantees to avoid major nuclear accidents caused by overheating of nuclear reactors. The installation quality of the flywheel is the basis for safe operation. During the assembly process in the factory and after a certain period of operation in the nuclear power plant, the flywheel needs to be subjected to ultrasonic UT non-destructive inspection. Once the flywheel is found ...

AI Technical Summary

Problems solved by technology

The rotor flywheel of the main pump motor and the shaft adopt a 1:10 taper fit. The advantage of the taper fit is that the flywheel can be disassembled for replacement. Due to the fit interference between the flywheel and the shaft, the heat sleeve of the flywheel undergoes alternating cooling and heating, and the mating surface will Stress is generated and hidden dangers are left, which must be eliminated. Moreover, the flywheel will produce axial displacement during the cooling process, which will affect the installation interference and position accuracy of the flywheel

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