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A surging prediction device for a centrifugal compressor has a differential pressure detector and a controller. The detector detects a differential pressure between a hub side pressure in the vicinity of an inlet or a diffuser in the centrifugal compressor and a shroud side presser in the vicinity o

A surging prediction device for a centrifugal compressor has a differential pressure detector and a controller. The detector detects a differential pressure between a hub side pressure in the vicinity of an inlet or a diffuser in the centrifugal compressor and a shroud side presser in the vicinity of the inlet of the diffuser. The controller compares the detected differential pressure from the detector 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.

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In a surging prediction device for a centrifugal compressor including an impeller mounted on a shaft and a housing which accommodates the impeller and a diffuser formed so that an inlet of the diffuser confronts an outer periphery of the impeller, the surging prediction device for a centrifugal comp

In a surging prediction device for a centrifugal compressor including an impeller mounted on a shaft and a housing which accommodates the impeller and a diffuser formed so that an inlet of the diffuser confronts an outer periphery of the impeller, the surging prediction device for a centrifugal compressor comprising: a hub side pressure detection means for detecting a hub side pressure which is a fluid pressure on a first wall of the diffuser in one direction of the shaft in the vicinity of the inlet of the diffuser; a shroud side pressure detection means for detecting a shroud side pressure which is a fluid pressure on a second wall of the diffuser in the other direction of the shaft in the vicinity of the inlet of the diffuser; a differential pressure detection means which is connected to the hub side pressure detection means and the shroud side pressure detection means, and detects a differential pressure therebetween; and a control means which receives a signal representing the detected differential pressure from the differential pressure detection means, and compares the detected differential pressure 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.