Rotary compressor having an oil groove in an inner peripheral surface of a bearing

摘要

A compression element includes a substantially spiral oil groove which is provided in inner peripheral surfaces of bearings and of the shaft. One end of the oil groove opens at a bearing base portion, and the other end of the oil groove opens at a bearing end. According to this configuration, oil in a gap between the shaft and inner peripheries of the bearings and forcibly discharges, into the hermetic container, gas bubbles generated in a sliding gap between the shaft and the bearings and by action of a viscosity pump generated by the substantially spiral oil groove, and it is possible to provide a rotary compressor capable of preventing seizing and wearing caused by gas-involvement at a bearing sliding portion, and capable of securing reliability when refrigerant including R32 is used.

主权项

1. A rotary compressor which uses refrigerant including R32, and which stores oil and a compression element in a hermetic container, wherein the compression element comprises:
a shaft having an eccentric portion; a cylinder forming a compression chamber concentrically with a rotation center of the shaft; a bearing which hermetically closes both side surfaces of the cylinder and which pivotally supports the shaft; a piston which is mounted on the eccentric portion and which rolls along an inner wall of the cylinder by rotation of the shaft; and a vane which partitions the compression chamber into a high pressure chamber and a low pressure chamber, wherein an oil groove is provided in an inner peripheral surface of the bearing, and one end of the oil groove opens at a bearing base portion which is on a side of the compression chamber, and an other end of the oil groove opens at a bearing end which is on a side of a space in the hermetic container, wherein the oil groove is formed with a spiral shape in which an opening of the bearing end is located closer to a rotation direction of the shaft than an opening of the bearing base portion, the oil groove is provided at a place other than a locus of an axis of the eccentric portion when the eccentric portion rotates and receives a varied load.