AIR CONDITIONER

摘要

An air conditioner is provided to improve the excellent performance by reducing the earth metallic oil volume toward the main circulation cycle and heating the compressor. An air conditioner comprises a compressor(200) where the oil working as a lubricant is mixed/discharged with a compressed refrigerant; a bypass pipe(230) connecting discharge and suction sides of the compressor; an opening and shutting valve(231) opening and shutting the inflow of the refrigerant and oil of the bypass pipe; and a microcomputer(710) opening the opening and shutting valve if the air temperature is under the pre-set temperature and shutting the opening and shutting valve if the temperature of the discharge side of the compressor is over the pre-set temperature. An expansion apparatus(232) is arranged between the opening and shutting valve and the suction port of the compressor.