Patent ID: 8801399
Filing Date: 2014-08-12
Classification: F04B,Y10S

Abstract:
1. A compressor comprising: a hermetic case to retain oil in a lower portion thereof; a frame accommodated in the hermetic case; a compression mechanism provided with a cylinder fixed to the frame, and a piston to reciprocate to compress a refrigerant in the cylinder; a power transmission mechanism provided with a stator fixed to the frame and a rotor adapted to rotate inside the stator; a rotating shaft coupled to an inside of the rotor to rotate together with the rotor and provided with an eccentric part to convert rotational motion of the rotor into translational motion of the piston and a hollow portion to raise the oil retained in the hermetic case; a spiral member inserted into the hollow portion of the rotating shaft, and coupled to an inner circumferential surface of the rotating shaft to rotate together with the rotating shaft to raise the oil retained in the hermetic case in cooperation with the inner circumferential surface of the rotating shaft, wherein the hollow portion has a length which extends substantially the entire length of the rotating shaft, and the spiral member extends substantially the entire length of the hollow portion; and a stationary fixation shaft inserted into the hollow portion, within the spiral member, that does not rotate with the rotating shaft, wherein a spiral groove is formed on an outer circumferential surface of the rotating shaft such that raised oil lubricates the rotating shaft while descending through the spiral groove.