Centrifugal compressor:composition of single stage centrifugal compressor: impeller volute gear bearing lubrication system.Centrifugal fan is to rely on the input of mechanical energy, improve the gas pressure side by side to send gas machinery.widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings ventilation, dust removal and cooling.ventilation and induced draft of boilers and industrial furnaces. The difference between centrifugal compressor and roots compressor.1 the principle of difference: roots compressor for the volume of the fan, the pressure difference is large, centrifugal compressor for the speed of the fan, the pressure difference is small, a large number of stand-alone processing(capacitry4th use centrifugal compressor)2 from the technical point of view, centrifugal compressor speed control in the following 20 thousand rpm, to enhance the temperature rise at around 8 degrees.roots steam compressor selection using low speed, generally