Patent ID: 7736138

Claim:
A compressor comprising: a compression element comprising a cylinder in which a compression space is constituted; a suction port and a discharge port which communicate with the compression space in the cylinder; a support member which closes an opening of the cylinder; a rotary shaft which is rotatably supported by a bearing formed on the support member; a compression member comprising a single inclined surface crossing an axial direction of the rotary shaft, wherein the single inclined surface varies continuously in an axial direction between a top dead center and a bottom dead center and which is disposed in the cylinder to be rotated by the rotary shaft and which compresses a fluid sucked from the suction port to discharge the fluid via the discharge port; a vane which is disposed between the suction port and the discharge port to abut on the surface of the compression member and which partitions the compression space in the cylinder into a low pressure chamber and a high pressure chamber; a piston ring seal which is disposed on the rotary shaft disposed in a position corresponding to the bearing; and a groove formed in an outer peripheral surface of the rotary shaft disposed in a position corresponding to an end portion of a bearing on a side opposite to a compression member, and wherein the piston ring seal is mounted in this groove; wherein a width of the piston ring seal is set to be equal to or less than a width of the groove, and an outer diameter of the piston ring seal is not more than that of the rotary shaft, whereby the piston ring seal is stored in the groove without protruding an outer peripheral edge of the piston ring seal from the outer peripheral surface of the rotary shaft when the piston ring seal is mounted in the groove.