COOLING CIRCUIT FOR AIR CONDITIONING SYSTEM FOR VEHICLE

摘要

PURPOSE: An air conditioning system is provided which prevents the deterioration of the performance and prevents an adverse influence of an oil insufficiency in a compressor by rearranging an oil advancing together with a refrigerant with the refrigerant and uses carbon dioxide as a refrigerant and includes an oil separator. CONSTITUTION: A vehicular air conditioning system(10) includes a compressor(110) having a crank chamber(138), a suction chamber(120), and a discharge chamber(122). A refrigerant mixture includes carbon dioxide and oil. A conduit(13) connects the discharge chamber(122) of the compressor(110) directly with an oil separator(14) to route the refrigerant mixture directly to the oil separator(14). Only a restricted orifice(16) is provided between the oil separator(14) and the crank chamber(138) of the compressor(110) to throttle oil as it travels directly to the crank chamber(138) of the compressor(110).