REFRIGERATION CYCLE

摘要

A refrigeration cycle is provided to reduce power consumption while solving problems of hunting and oil circulation by combining a variable displacement compressor with a normal charge type temperature expansion valve. An expansion valve controls flux of a refrigerant supplied to an evaporator so that a refrigerant of an outlet of the evaporator has the predetermined degree of superheat. The expansion valve makes the refrigerant of the minimum flux flow when the flux is throttled to the extreme. A first port(12) of the expansion valve receives a liquid refrigerant of high temperature and pressure from a receiver. A second port(13) supplies the expanded refrigerant of low temperature and pressure to an evaporator. A third port(14) receives the refrigerant evaporated from the evaporator. A four port(15) returns the refrigerant passing through the expansion valve to a variable displacement compressor.