CENTRIFUGAL COMPRESSOR AND MANUFACTURING METHOD THEREFOR

摘要

A centrifugal compressor includes: a volute casing 1 including a first casing 11 and a second casing 12 that are mutually coupled, the first casing 11 including a volute chamber M therein and the second casing 12 including an impeller installation space N therein; an impeller 2 provided in the impeller installation space so as to be rotatable around a rotation axis 3; and a vaneless diffuser 4 that has an inlet 41 that communicates with an inside of the second casing 12 and has an outlet 42 that communicates with an inside of the first casing 11. The vaneless diffuser 4 has a width b having a non-axisymmetric distribution in the circumferential direction.