Patent ID: 8708661

Claim:
A compression device, comprising: a casing; a compressor in the casing, the compressor comprising: a cylinder with a compression chamber; a rolling piston eccentrically coupled to the cylinder; a shaft including an oil feeder coupled to the rolling piston; and upper and lower bearings adjacent upper and lower sides of the cylinder, respectively; a driver to drive the compressor; a detector to detect a level of oil in an oil storage area; and a controller to control an operating speed of the compressor based on the detected oil level, wherein, during a speed-change operation, the controller controls acceleration of the compressor to maintain the oil level within a predetermined range when the oil level is detected to be outside the predetermined range, and wherein the controller stops acceleration of the compressor and maintains the operating speed of the compressor at a substantially constant speed for a predetermined time when the oil level is detected to be lower than a lowermost portion of the oil feeder during the speed-change operation.