Scroll structure of centrifugal compressor

摘要

A scroll structure of a centrifugal compressor 1 having a spirally formed scroll passage 13. The scroll passage 13 includes: a flat connecting portion A at a flow passage joint 23 where a scroll start and a scroll end of the scroll passage 13 meet, this flat connecting portion having a flat cross-sectional shape with a same height as that of an outlet passage of a diffuser; and a transition part 21 where the flat cross-sectional shape of the flat connecting portion A gradually changes back to a circular cross-sectional shape along a circumferential direction.

主权项

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.