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

Claim 0:
1. A scroll structure of a centrifugal compressor having a scroll passage formed in spiral shape and having a larger dimension in an axial direction of the centrifugal compressor at a winding end portion of the scroll passage than at a winding start 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, and wherein a circumferential length of the tongue portion of the centrifugal compressor from the winding start portion to the tongue portion is longer than the protruding height,
wherein the starting position is a position at an angle of 8 degrees or less in a circumferential direction of the centrifugal compressor from the tongue portion toward an upstream side of the scroll passage.