A shaft displacement fault self-healing control device for a centrifugal compressor

Abstract

The invention discloses a shaft displacement fault self-healing adjusting device for a centrifugal compressor. The device comprises a thrust sliding bearing, a magnetic thrust bearing, a thrust rolling bearing, a shaft, a thrust plate and a controlling assembly. The controlling assembly is formed by a temperature sensor, a shaft displacement sensor, an electric current sensor, a power amplifier and a controller. By cooperatively using the thrust sliding bearing and the magnetic thrust bearing, bearing pad temperature of the thrust sliding bearing and rotor shaft displacement are taken as mainmonitoring values, collection signals are fed back to the magnetic thrust bearing to change coil currents to control magnitude of electromagnetic force. Suction force is provided to the thrust plate by the magnetic thrust bearing, repulsive force is provided to the thrust plate by the thrust sliding bearing, the repulsive force and the suction force are combined to cancel axial loading impacting on the thrust sliding bearing out to decrease the bearing pad temperature. The self-healing adjusting device has the advantages that loading capacity of thrust bearings can be improved, service lives of the thrust bearings can be prolonged, power dissipation is reduced, and meanwhile shaft displacement can be intelligently controlled.

Description

technical field [0001] The invention relates to a shaft displacement fault self-healing control device for a centrifugal compressor. The function is to support the rotor in the axial direction, increase the bearing capacity of the thrust bearing, actively reduce the bearing bush temperature of the thrust sliding bearing, and realize axial positioning. Background technique [0002] In actual production, one of the reasons for the shaft displacement failure of centrifugal compressors is that the calculation of the axial force is inaccurate, the axial load is too large, the axial displacement increases accordingly, and the oil film on the surface of the thrust sliding bearing is squeezed and broken. This in turn leads to shoe burning in thrust sliding bearings. Another reason is that due to the improper structure design of the thrust sliding bearing, the temperature of the bearing bush is too high, which makes the equipment forced to interlock and stop. Regardless of the above...

AI Technical Summary

Problems solved by technology

But in case the control system fails suddenly, the rotor will be rubbed instantly, which will cause great damage to the whole unit

Although electromagnetic bearings have been applied in many fields, from the perspective of application, the potential of electromagnetic bearings has not been fully utilized, and it is far from reaching the level of replacing other bearings.

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