Scroll compressor

A scroll compressor comprising:

• a shell;
• a compression mechanism unit provided in the shell, and including a compression chamber configured to compress fluid that is drawn in from a fluid intake;
• a drive mechanism unit configured to drive the compression mechanism unit;
• a rotation shaft configured to be rotated by a driving force generated in the drive mechanism unit;
• and
• a main frame having an outer circumferential surface that is in contact with and fixed to an inner wall surface of the shell, the main frame supporting the compression mechanism unit in an axial direction of the rotation shaft,
• wherein
• in the main frame, a suction port is formed to guide fluid sucked into the shell to the compression chamber,
• the suction port is provided as a through hole formed in an outer circumferential portion of the main frame, or is defined by the inner wall surface of the shell and a groove formed in the outer circumferential surface of the main frame, the suction port having an inlet portion and an outlet portion, the inlet portion being formed such that a cross-sectional area of a flow passage in the inlet portion decreases from an upstream-side opening of the suction port, the outlet portion being formed continuously from the inlet portion to a downstream-side opening of the suction port such that a cross-sectional area of the flow passage in the outlet portion increases,
• the main frame has a first surface in which the upstream-side opening of the suction port is formed, the first surface being perpendicular to the rotation shaft, and a second surface that is located opposite to the first surface in the axial direction,
• a boundary part between the inlet portion and the outlet portion is located closer to the second surface than an intermediate line between the first surface and the second surface in the axial direction, and
• a wall surface of the outlet portion that is located on an inner side in a radial direction perpendicular to the axial direction is an inclined surface that is inclined inwardly in the radial direction, in a direction from an upstream side toward a downstream side.