Refrigerant compressor and refrigeration apparatus using the same

A refrigerant compressor comprising:

• a sealed container in which refrigerating machine oil is stored;
• an electric element accommodated in the sealed container and driven by electric power supplied from outside;
• and
• a compression element accommodated in the sealed container and covered with the refrigerating machine oil, the compression element being driven by the electric element to compress refrigerant gas supplied from outside, wherein
• the compression element includes:
• a crankshaft including a main shaft and an eccentric shaft that are arranged side by side in a longitudinal direction;
• a main bearing that pivotally supports the main shaft;
• and
• an eccentric bearing that pivotally supports the eccentric shaft,
• a shaft part that is at least one of the main shaft and the eccentric shaft, or a bearing part that is at least one of the main bearing and the eccentric bearing, is provided with a tapered portion, the tapered portion being formed on at least one of one end side and another end side of the shaft part or the bearing part in an axial direction of the bearing part such that a diameter of the shaft part or the bearing part changes from an outer side toward a central side in the longitudinal direction of the crankshaft, the tapered portion allowing the shaft part and the bearing part to come into line contact with each other in a state where an axis of the shaft part is tilted relative to an axis of the bearing part,
• a ratio C/D, which is a ratio of a clearance C between the shaft part and the bearing part to a diameter D of the shaft part, is set to a value within a range of not less than 4.0×10−4 and not greater than 3.0×10−3,
• a taper depth dB, which corresponds to a distance between one end and another end of the tapered portion in the axial direction of the bearing part, the distance being in a direction perpendicular to the axis of the bearing part, is set to a value not less than 2.0×10−3 mm, and
• in a combination of the shaft part and the bearing part corresponding thereto, a ratio G/D, which is a ratio of a maximum gap G to the diameter D of the shaft part, is set to a value not greater than 4.0×10−3, the maximum gap G being a sum of the clearance C and a total value of the taper depth dB of the tapered portion.