Compressor

摘要

A compressor is provided that may include a cylinder including an outer cylinder portion and an inner cylinder portion, and a vane portion connected between the outer cylinder portion and inner cylinder portion, which is fixed to a casing. A rolling piston may be slidably coupled to the vane portion to form an outer compression space and an inner compression space while making a turning movement between the outer cylinder portion and the inner cylinder portion. Through this, a weight of a rotating body may be reduced to obtain low power loss with respect to a same cooling power and a small bearing area, thereby reducing refrigerant leakage as well as easily changing a capacity of a cylinder in an expanded manner. Moreover, refrigerant may be discharged in opposite directions in each compression space, thereby reducing vibration noise of the compressor. In addition, a back pressure groove may be formed on an upper surface of a drive transmission portion of the rolling piston, thereby reducing a friction area between the rolling piston and the upper bearing, as well as reducing a friction loss between the rolling piston and the upper bearing due to oil filled into the back pressure groove.

主权项

1. A compressor, comprising
a casing; a crank shaft configured to transmit a rotational force of a motor drive provided within the casing to a rolling piston; a plurality of bearing plates configured to support the crank shaft; a cylinder fixed and coupled between the plurality of bearing plates, an outer cylinder portion and an inner cylinder portion of which are connected to a vane portion to form a compression space; and the rolling piston, which is slidably coupled to the vane portion between the outer cylinder portion and the inner cylinder portion to divide the compression space into an outer compression space and an inner compression space while making a turning movement by the crank shaft, wherein a back pressure groove having a predetermined area and depth is formed on the surface of the rolling piston, and wherein the back pressure groove is formed in such a manner that a virtual line connected to a center of the back pressure groove in a radial direction has a different radius from a geometric center of the rolling piston along a rotation angle of the crank shaft.