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

Claim 9:
10. A scroll structure of a centrifugal compressor having a scroll passage formed in spiral shape and formed so that a cross-sectional area of the scroll passage increases from a winding start portion of the scroll passage to a winding end portion of the scroll passage, 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 the winding start portion and the winding end portion 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 the protruding height is 30% or less of a height dimension along an axial direction of the centrifugal compressor at a position where the cross-sectional area of the scroll flow passage is a smallest.