A surging prediction device for a centrifugal compressor.

摘要

A surging prediction device for a centrifugal compressor (100) has a differential pressure detector (13) and a controller (14). The detector (13) detects a differential pressure between a hub side pressure in the vicinity of an inlet of a diffuser (4) in the centrifugal compressor (100) and a shroud side pressure in the vicinity of the inlet of the diffuser (4). The controller (14) compares the detected differential pressure from the detector (13) with a set differential pressure beforehand set so as to be lower than a surging differential pressure between the hub side pressure and the shroud side pressure at an occurrence time of surging, and outputs a surging signal predicting an occurrence of surging when the detected differential pressure becomes higher than the set differential pressure.