Centrifugal compressor and diffuser

Abstract

The disclosure relates to a centrifugal compressor and a diffuser (100); the diffuser includes a pressure drive mechanism (10), a first diffuser part (32), a second diffuser part (34) and a movable diffuser part (50)movable diffuser part being connected with the pressure drive mechanism (10) and movably arranged on one of the first diffuser part (31) and the second diffuser part (34); moreover, the movable diffuser part gets close to or leaves away from the other one of the first diffuser part (31) and the second diffuser part (34) under the action of a pressure medium in the pressure drive mechanism (10) so as to adjust a width of a pressure diffusion flow channel (20) and prevent adverse phenomena such as gas flow stall and surging.