ROTARY COMPRESSOR EJECTING COMPRESSION REFRIGERANTS OF CYLINDER OUT OF CYLINDER THROUGH HOLLOW UNIT FOR DISCHARGING PROPER AMOUNT OF OIL

PURPOSE: A rotary compressor is provided to discharge the proper amount of oil by ejecting compression refrigerants of a cylinder out of the cylinder through a hollow unit formed in a rotary shaft and to reduce pressure pulsation generated in compressing the refrigerant by mounting a resonator at the end of the hollow unit. CONSTITUTION: A rotary compressor is composed of a rotor(108); a rotary shaft(106) having an eccentric cam(106a) and rotating together with the rotor; a roller(110) rotated by the rotation of the rotary shaft with an eccentric trace; a cylinder(112) for receiving and rotating a portion of the rotary shaft and the roller and sucking in and compressing the refrigerant; a vane for reciprocating according to the rotation of the roller and dividing an inner space of the cylinder into a suction part and a compression part; a suction port(172) for communicating with the compression part of the cylinder; a discharge port(174) for communicating with the outer space of the cylinder; a hollow unit(176) disposed between the suction and discharge ports to discharge the refrigerant sucked in through the suction port and contained in the compression part through the discharge port to the outer space of the cylinder; and a resonator for reducing pressure pulsation generated in compressing the refrigerant. The suction and discharge ports, the hollow unit, and the resonator are arranged in the rotary shaft.