Patent ID: 8118577

Claim:
A scroll compressor comprising: a fixed scroll which has a spiral wall formed upright on one side face of an end plate; and an orbiting scroll which has a spiral wall formed upright on one side face of an end plate and which is supported, when the walls are engaged, so as to allow orbital revolving motion thereof while preventing rotation thereof, the one side face of the end plate of at least one of the fixed scroll and the orbiting scroll being provided with a step part formed to be higher at a center portion and lower at an outer end along a spiral of the wall, an upper edge of the wall of the other one of the fixed scroll and the orbiting scroll being divided into a plurality of portions whose height is low at a center portion of a spiral and is high at an outer end of the spiral, to form a stepped shape corresponding to the step part provided on the end plate, wherein a cylinder oil circulation rate of lubricant taken into the scroll compressor and circulated together with refrigerant is set to fall within the range from 1% or more to 10% or less based on a parameter determined by a product of a rotational speed of the scroll compressor and a pressure of refrigerant measured at an inlet of the scroll compressor.