Patent ID: 9541094
Date: 2017-01-10
CPC Classifications: F04D,F05D

Claim:
1. A centrifugal compressor comprising: a compressor blade; a diffuser disposed on a radially outer side of the compressor blade; an outlet passage; and a scroll passage formed spirally around the diffuser, said scroll passage including: a connecting portion disposed at a flow passage joint where a scroll start and a scroll end of the scroll passage meet, the connecting portion having a flat-sided cross-sectional shape with a same height as that of the outlet passage of the diffuser; and the scroll passage further comprising a transition part disposed on a downstream side of the flat-sided connecting portion, the transition part having a cross-sectional shape which gradually changes, along a circumferential direction of the centrifugal compressor, from the flat-sided cross-sectional shape of the connecting portion to a circular cross-sectional shape.