Rotary compressor having improved vane chattering performance

A rotary compressor, comprising:

• a casing;
• a drive motor provided inside of the casing to generate rotational power;
• a cylinder having an inner peripheral surface that defines a compression space, and provided with a suction port configured to communicate with the compression space and through which refrigerant is suctioned into the compression space;
• a roller provided in the compression space of the cylinder so as to be rotatable by the rotational power transmitted from the drive motor, and having a plurality of vane slots that provides a back pressure at one side thereinside and that is provided at a predetermined interval along an outer peripheral surface of the roller;
• a plurality of vanes slidably inserted into the plurality of vane slots, respectively, to rotate together with the roller, front end surfaces of which come into contact with the inner peripheral surface of the cylinder due to the back pressure to partition the compression space into a plurality of compression chambers;
• and
• a main bearing and a sub bearing provided at ends of the cylinder, respectively, and spaced apart from each other to define surfaces of the compression space, respectively, wherein high-pressure refrigerant is accommodated between one vane of the plurality of vanes and the inner peripheral surface of the cylinder, and wherein the back pressure is maintained at a predetermined level to allow the front end surface of the one vane of the plurality of vanes to come into contact with the inner peripheral surface of the cylinder until the high-pressure refrigerant is bypassed to the suction port.