Dismounting and mounting oil pressurizing technology for nuclear power station shaft seal main pump motor flywheel

Abstract

The invention relates to a dismounting and mounting oil pressurizing technology for a nuclear power station shaft seal main pump motor flywheel. The technology comprises the steps that a shaft 2 is vertically hoisted into an inner hole of a flywheel inner sleeve 5 in a room temperature state and slightly falls until no gap exists between the outer diameter of the shaft 2 and the inner hole of a flywheel 3, and a gauge block is adopted to measure the distance between the surface F of the flywheel inner sleeve 5 and the surface E of the shaft 2 and denotes the value A. With adoption of the excessive shrinkage fit limiting and oil pressurizing callback technology, shrinkage fit stress can be completely released under the action of a high-pressure oil film, meanwhile, on the basis of the fact that the flywheel and the shaft are in 1:10 taper fit, the flywheel axially displaces by 10 units, the magnitude of interference changes by 1 unit, axial micro-movement of the flywheel can be accurately controlled through the oil pressure and oil mass control technology, and then micro-adjustment of the interference magnitude of the flywheel is controlled. According to the technology, high adjustment precision is achieved, the axial position deviation of the flywheel is adjusted to be + / -0.15 mm, the interference magnitude deviation is adjusted to be + / -0.015 mm, harmful stress residues are avoided, and installation precision is guaranteed.

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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