MULTI-STAGE CENTRIFUGAL COMPRESSOR PROVIDED WITH CAPACITY CONTROL DEVICE USING HIGH PRESSURE WORKING FLUID INJECTION METHOD

摘要

A multi-stage centrifugal compressor with a capacity control device using a high pressure working fluid injection method is provided to finely control compression capacity with simple structure that changes the flow of working fluid sucked in an impeller by injection of high pressure fluid through an injection nozzle. A multi-stage centrifugal compressor with a capacity control device using a high pressure working fluid injection method includes at least one injection nozzle(100), a fluid source, and a pressure adjusting module. The injection nozzle is installed at a suction side path(2) of any one impeller(21) and injects high pressure fluid in a direction crossing the longitudinal direction of a driving shaft to change main flow of working fluid to the impeller. The fluid source supplies the high pressure fluid to the injection nozzle. The pressure adjusting module changes the pressure of the fluid supplied from the fluid source to the injection nozzle.