Compressor cover, centrifugal compressor, and turbocharger, and compressor cover manufacturing method

Abstract

A compressor cover covering a delivery fan radially outwardly discharging a fluid from an axial direction by rotating around the axis, the compressor cover comprising: a cover body including a tubular part in which a tubular inner peripheral surface along the axis and a shroud surface disposed on an axially downstream side of the tubular inner peripheral surface and expands in diameter toward the downstream side are formed; and a sleeve including an outer tube having an outer peripheral surface fitted to the tubular inner peripheral surface, an inner tube disposed on a radially inner side of the outer tube and defines a recirculation flow path in which a portion of the fluid circulates between the inner tube and the outer tube, and a plurality of struts disposed at intervals in the peripheral direction.