Patent ID: 8297957

Claim:
A compressor comprising: a casing to which a gas suction pipe is connected; a driving motor provided in the casing; a cylinder; a valve supporting plate covering the cylinder, the valve supporting plate having a suction hole for sucking gas into the cylinder and two discharge holes for discharging gas compressed in the cylinder; a piston having two protrusions at a pressure surface in correspondence to the two discharge holes of the valve supporting plate, the two protrusions having different sized cross-sections, the piston being linearly reciprocal in the cylinder by receiving a driving force of the driving motor; a suction valve coupled to the valve supporting plate to open and close the suction hole; and a discharge valve assembly coupled to the valve supporting plate to open and close the two discharge holes, wherein the discharge valve assembly includes a single discharge valve to open and close the two discharge holes, wherein valve supporting protrusions extend from each edge of the discharge holes for supporting the discharge valve, a valve supporting protrusion of the two valve supporting protrusions that is positioned nearest a fixing portion fixed to one side of the valve supporting plate for fixing the discharge valve to the valve supporting plate has a height lower than that of the other valve supporting protrusion, and wherein a relatively smaller one of the two discharge holes is located between the fixing portion and a relatively larger one of the two discharge holes.