Patent ID: 7597547

Claim:
A rotary compressor having two different compression capacities in clockwise and counterclockwise rotational directions, comprising: a driving shaft that is rotatable in clockwise and counterclockwise directions, and having an eccentric portion of a predetermined size; a cylinder having a predetermined inner volume; a roller rotatably coupled to an outer circumference of the eccentric portion of the driving shaft so as to contact an inner circumference of the cylinder, wherein the roller performs a rolling motion along the inner circumference of the cylinder and forms a fluid chamber to suction and compress fluid; a vane elastically installed in the cylinder to contact the roller; upper and lower bearings respectively installed at upper and lower portions of the cylinder, that rotatably support the driving shaft and hermetically seals an inner volume of the cylinder; a plurality of suction ports and a plurality of discharge ports that communicate with the fluid chamber so as to suction fluid into and discharge fluid from the fluid chamber; and a compression mechanism configured to form different sizes of compressive spaces in the fluid chamber based on the rotational direction of the driving shaft.