Patent ID: 6935126

Claim:
A refrigeration cycle system comprising: a compressor for compressing and discharging a refrigerant; a condenser for condensing the refrigerant discharged from the refrigerant compressor to a liquid refrigerant; a liquid refrigerant receiver for separating the refrigerant delivered from the refrigerant condenser into a liquid refrigerant and a gaseous refrigerant and allowing only the liquid refrigerant to be delivered; a variable throttle valve defining a valve hole through which the liquid refrigerant delivered from the liquid refrigerant receiver passes; a valve body for adjusting an area of opening of the valve hole; a refrigerant evaporator for evaporating the refrigerant having been adiabatically expanded upon passing through the valve hole of the variable throttle valve; and a refrigerant-to-refrigerant heat exchanger for exchanging heat between a high pressure refrigerant delivered from said liquid refrigerant receiver and a low pressure refrigerant delivered from said refrigerant evaporator, wherein said variable throttle valve is actuated in response to a level of subcooling of a refrigerant detected at an outlet of said high pressure refrigerant of said refrigerant-to-refrigerant heat exchanger in a manner that said variable throttle valve reduces an area of opening or a degree of throttle opening of said valve hole or an amount of lift of said valve body as a level of subcooling of a refrigerant delivered from said refrigerant-to-refrigerant heat exchanger increases or has increased to a predetermined value or more, and said variable throttle valve increases the area of opening or the degree of throttle opening of said valve hole or the amount of lift of said valve body as the level of subcooling of the refrigerant delivered from said refrigerant-to-refrigerant heat exchanger decreases or has reduced to the predetermined value or less.