Rotary compressor

A rotary compressor, comprising:

• a casing that defines an oil storage space therein;
• a cylinder fixed inside of the casing;
• a main bearing and a sub bearing coupled to the cylinder to form a compression space together with the cylinder;
• a rotary shaft supported in a radial direction by the main bearing and the sub bearing;
• a roller disposed in the rotary shaft to be eccentric with respect to the compression space, and having at least one vane slot formed along an outer circumferential surface, and a back pressure chamber that communicates with an inner end of the vane slot;
• and
• at least one vane slidably inserted into the vane slot and having a front end surface in contact with an inner circumferential surface of the cylinder to divide the compression space into a plurality of compression chambers, wherein an oil is formed in a hollow shape inside of the rotary shaft, wherein an oil supply guide groove that communicates with the back pressure chamber is disposed in an axial side surface of the roller, wherein an oil supply hole is formed through an inner circumferential surface of the oil passage toward an inner circumferential surface of the oil supply guide groove, and wherein a cross-sectional area of oil supply guide groove is larger than a cross-sectional area of the back pressure chamber.

A rotary compressor, comprising:

• a casing that defines an oil storage space therein;
• a cylinder fixed in the casing to form a compression space;
• a main bearing and a sub bearing disposed on both sides of the cylinder in an axial direction and having a main bearing hole and a sub bearing hole formed therethrough, respectively, in the axial direction;
• a rotary shaft supported by being inserted through the main bearing hole and the sub bearing hole;
• a roller disposed in the rotary shaft to be eccentric with respect to the compression space, and having at least one vane slot formed along an outer circumferential surface thereof, and a back pressure chamber that communicates with an inner end of the vane slot;
• at least one vane slidably inserted into the vane slot and having a front end surface in contact with an inner circumferential surface of the cylinder to divide the compression space into a plurality of compression chambers;
• and
• an oil supply hole formed through the main bearing or the sub bearing, wherein a first end of the oil supply hole is in communication with the oil storage space and a second end of the oil supply hole is located in a rotational path of the back pressure chamber, wherein the oil supply hole includes a communication groove formed between a side surface of the second end of the oil supply hole and a side surface of one of a plurality of back pressure pockets disposed in the main bearing or the sub bearing.