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

An annular compressor cover that forms a flow path wall of a diffuser flow path in a centrifugal compressor,

• wherein, when a position of a winding end of a scroll flow path of the centrifugal compressor is defined as a position of 360° in a circumferential direction of the compressor cover, a direction in which a fluid in the scroll flow path flows in the circumferential direction is defined as a positive direction of a position in the circumferential direction, and a distance between an outlet of the diffuser flow path and a central axis of an inner peripheral surface of the compressor cover for each position in the circumferential direction is defined as a diffuser radius,
• an average value of the diffuser radiuses in a range from a position of a tongue portion of the scroll flow path to 180° in the circumferential direction is smaller than an average value of the diffuser radiuses in a range from 180° to 360° in the circumferential direction, and
• wherein, when viewed in an axial direction of the compressor cover, the outlet of the diffuser flow path has a perfect circular shape, and
• a center of the perfect circular shape defining the outlet of the diffuser flow path is eccentric from the central axis such that the center is positioned within a range from 270° to 360° in the circumferential direction.