Patent ID: 7891956

Claim:
A rotary compressor comprising: a driving shaft being rotatable clockwise and counterclockwise, and having an eccentric portion of a predetermined size; a cylinder forming a predetermined inner volume; a roller installed rotatably on an outer circumference of the eccentric portion so as to contact an inner circumference of the cylinder, performing a rolling motion along the inner circumference and forming a fluid chamber to suck and compress fluid along with the inner circumference; a vane installed elastically in the cylinder to contact the roller continuously; upper and lower bearings installed respectively in upper and lower portions of the cylinder, for supporting the driving shaft rotatably and sealing the inner volume hermetically; discharge ports communicating with the fluid chamber, the discharge ports comprising a first discharge port and a second discharge port positioned to face each other with respect to the vane; suction ports communicating with the fluid chamber, the suction ports comprising a first suction port positioned across the vane from the second discharge port, a second suction port positioned across the vane from the first discharge port and a third suction port positioned between the second suction port and the vane; a valve assembly for selectively opening any one of the suction ports according to a rotation direction of the driving shaft; the valve assembly comprising: a first valve installed rotatably between the cylinder and the lower bearing; and a second valve guiding a rotary motion of the first valve; and the first valve comprising: a first opening communicating with the second suction port when the driving shaft rotates in any one of the clockwise direction and the counterclockwise direction; and a second opening communicating with the second suction port when the driving shaft rotates in the other of the clockwise direction and the counterclockwise direction, wherein the roller compresses the fluid from the first suction port to the second discharge port when the driving shaft rotates in a first direction and the roller compresses the fluid from the second suction port to the first discharge port when the driving shaft rotates in a second direction opposite the first direction, and a separating angle of the first suction port from the vane is different than a separating angle of the second suction port from the vane.