Method for positioning axial position of rubbing movement of steam turbine generator unit

Abstract

The invention discloses a method for positioning an axial position of a rubbing movement of a steam turbine generator unit. Rubbing faults of a large-scale steam turbine generator unit happen at different positions, reasons for the faults are very different, and results caused by the faults are also different; and quick and accurate diagnoses of the rubbing faults and the positions of rubbing have important theoretical value and engineering application value. According to vibrations, which are obtained by a vibration test system, of bearings at two ends of a unit rubbing movement rotor, a maximum value in the processes of vibration and fluctuation and the variable quantity of vibrations under a normal condition are used as fault vectors caused by rubbing movement faults, and an in-phase component and an anti-phase component of the fault vectors are obtained through vector calculation. According to the method, a calculation formula of the axial position of a friction point is established through a ratio relation between the anti-phase component and the in-phase component, and the axial positions of the rubbing movement faults of a steam turbine generator rotor can be effectively determined through a vector criterion of the rubbing movement faults.

Description

technical field [0001] The invention relates to the field of vibration fault diagnosis and control of rotating machinery, in particular to a method for locating the axial position of dynamic and static rubbing friction of a large steam turbine generator set. Background technique [0002] Dynamic and static rubbing is a common fault in the start-stop and operation of large turbo-generator sets. The internal mechanism of rubbing faults is complex, and the vibration characteristics are more diverse and uncertain than other faults. The type, degree and stage of rubbing vary greatly; it is also often affected by the external environment, such as the type of measuring point, the sampling rate of measurement and analysis instruments , resolution, etc. These make on-site analysis and diagnosis more difficult than other faults, and identification errors and delays often occur. The location of rubbing failure of large steam turbine generator sets is different, the cause of the failu...

AI Technical Summary

Problems solved by technology

The light friction between dynamic and static friction will cause the wear of the steam seal, resulting in the increase of the leakage of the steam seal and the decrease of the efficiency of the turbo-generator, and the severe one will cause the blade to break, the main shaft to bend, and even the turbo-generator to be completely damaged

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