Center adjustment method of bi-directional thrust bearing for shaft seal and main pump positioning in nuclear power plant

Abstract

The invention relates to a nuclear power plant shaft seal reactor coolant pump positioning bidirectional thrust bearing center adjusting method. The total clearance between the upper pump shaft and aradial bush is repeatedly pushed out in the thrust bearing by the upper pump shaft, the upper pump shaft is pushed to a calculation center, the circumferential clearance between the upper pump shaft and the radial bush is the same, whether to be also in the center of a sealed chamber is adjusted and verified through rotating a turning gear, and the correct position of the bidirectional thrust bearing is further determined. The process method for the bidirectional thrust bearing position adjusted by the process method is high in precision, bush grinding, bush burning and other conditions can beavoided, the vibration value is reduced, the reactor coolant pump product adjusted by the method can completely meet the design requirements and can be successfully applied to a product manufacturingprocess, and the efficiency is high.

Description

Technical field: [0001] The invention relates to a method for adjusting the center of a shaft seal and a main pump of a nuclear power plant for positioning a two-way thrust bearing. Background technique: [0002] The positioning bearing position of the general assembly of the nuclear power plant shaft seal main pump manufacturing plant is the key to the normal operation of the nuclear power plant shaft seal main pump. If the bearing position deviation is too large, the vibration of the main pump will be too large and the burning of tiles will occur, which will lead to the failure of the nuclear main pump. operation, serious accidents may occur. The position of the locating bearing in the general assembly of the shaft seal main pump manufacturer of nuclear power plant is the key process in the main pump assembly, and it is also the core process. The accuracy of positioning bearing position in the general assembly of the shaft seal main pump manufacturing plant of nuclear pow...

AI Technical Summary

Problems solved by technology

There is no precedent in China. Foreign counterparts are currently using a feeler gauge to measure the gap between the radial pad and the upper pump shaft to locate the position of the upper pump shaft in the two-way thrust bearing. This method has a narrow measurement space, and it is difficult to insert the feeler gauge into the measurement operation, and the feeler gauge is easy to fall off. The feeler gauge cannot accurately measure the clearance, which may cause the upper pump shaft to have uneven clearance in the radial direction and the circumferential direction. When adjusting the upper pump shaft and the center of the seal chamber, connect the overall shaft system and measure the distance between the shaft system and the seal body indirectly. The method to locate the position of the two-way thrust bearing, because the upper pump shaft and the sealing body are not on the same plane, if the shaft system is tilted, the position of the two-way thrust bearing cannot be accurately reflected, resulting in the shaft system may be biased to one side during operation, The radial pad on one side of the two-way thrust bearing is severely worn or burned. Due to the inclination of the upper pump shaft, the main thrust pad and the auxiliary thrust pad are subjected to uneven force and serious damage, and the pad temperature is too high. The vibration value of the main pump is too large. It cannot run normally, the overall shaft system is tilted, the impeller scrapes the impeller cover during operation, and the lower pump shaft is in contact with the inclined side of the lower guide bearing, resulting in serious wear on the carbon ring side of the lower guide bearing

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