Refrigeration cycle system for vehicle air conditioning system, has throttle valve reducing and increasing degree of valve hole throttle opening as level of refrigerant subcooling increases and decreases, respectively

摘要

The system has a refrigerant-to-refrigerant heat exchanger (5) exchanging heat between high pressure refrigerant and a low pressure refrigerant. A variable throttle valve (6) reduces and increases an area of opening/degree of throttle opening of a valve hole (67)/ an amount of lift of a valve body as a level of subcooling of the refrigerant from the exchanger increases and decreases, respectively. The high pressure refrigerant is received from a liquid refrigerant receiver and the low pressure refrigerant is received from a refrigerant evaporator.