Patent ID: 11905969
Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 12:
13. A scroll structure of a centrifugal compressor having a scroll passage formed in spiral shape, comprising:
a tongue portion separating the scroll passage from an outlet passage connected to a downstream side of the scroll passage at a most downstream position of the scroll passage in a passage connecting portion where a winding start portion and a winding end portion of the scroll passage intersect; and
a ridge portion protruding from an inner peripheral surface of the scroll passage on an axially downstream side of the centrifugal compressor toward an axially upstream side of the centrifugal compressor, wherein a protruding height of the ridge portion protruding toward the axially upstream side gradually increases toward the tongue portion from a starting position that is located upstream from the tongue portion in the scroll passage,
wherein a curvature radius of a curve connecting an apex of the ridge portion defining the protruding height from the tongue portion to the starting position is located on the axially upstream side, and
wherein the curvature radius gradually increases from the tongue portion to the starting position in at least a portion of the apex.