CENTRIFUGAL COMPRESSOR WITH SURGE PREDICTION

摘要

A centrifugal compressor for a chiller includes a casing, an inlet guide vane, an impeller downstream of the inlet guide vane, a rotational magnetic bearing, a magnetic bearing sensor, a motor, a diffuser and a controller. The casing has inlet and outlet portions with the inlet guide vane disposed in the inlet portion. The impeller is attached to a shaft. The radial magnetic bearing rotatably supports the shaft. The magnetic bearing sensor detects at least one of a position signal indicative of the shaft's position and a current signal indicative of current supplied to the magnetic bearing. The motor rotates the shaft in order to rotate the impeller. The diffuser is disposed in the outlet portion downstream from the impeller. An outlet port of the outlet portion is disposed between the impeller and the diffuser. The controller is programmed to predict surge based on the position signal and/or the current signal.

主权项

1. A centrifugal compressor adapted to be used in a chiller, the centrifugal compressor comprising:
a casing having an inlet portion and an outlet portion; an inlet guide vane disposed in the inlet portion; an impeller disposed downstream of the inlet guide vane, the impeller being attached to a shaft rotatable about a rotation axis, at least one radial magnetic bearing rotatably supporting the shaft; at least one magnetic bearing sensor arranged to detect at least one of a position signal indicative of the shaft's position and a current signal indicative of current supplied to the at least one magnetic bearing; a motor arranged and configured to rotate the shaft in order to rotate the impeller; a diffuser disposed in the outlet portion downstream from the impeller with an outlet port of the outlet portion being disposed between the impeller and the diffuser; and a controller programmed to predict surge based on the at least one of the position signal and the current signal.