MULTISTAGE CENTRIFUGAL COMPRESSOR

摘要

A multistage centrifugal compressor (1) is described. The compressor comprises a casing (3) and a shaft (9) rotatingly supported in the casing (3) by at least a first bearing and a second bearing (11; 13). At least one in-between-bearing impeller (19A-19D) is mounted on the shaft (9), between said first bearing and said second bearing (11, 13). An overhung impeller (15) is mounted at one end of the shaft (9). A first diaphragm arrangement (25, 25X) is further located in the casing (3). The first diaphragm arrangement comprises return a channel assembly (23A) with a plurality of stationary return channel blades (27A) defining a plurality of return vanes for redirecting compressed gas from an exit location of the overhung impeller to an inlet location of the in-between-bearings impeller. The first diaphragm arrangement (25, 25X) houses one of the first bearing and second bearing (11; 13).