초록 ▼

In a refrigerant cycle having a gas refrigerant bypass passage through which high-temperature gas refrigerant is introduced from a compressor into an evaporator while bypassing a condenser, a super-heating degree of gas refrigerant discharged from the compressor is determined according to signals fr

In a refrigerant cycle having a gas refrigerant bypass passage through which high-temperature gas refrigerant is introduced from a compressor into an evaporator while bypassing a condenser, a super-heating degree of gas refrigerant discharged from the compressor is determined according to signals from a pressure sensor and a temperature sensor disposed at a refrigerant discharging side of the compressor. According to the super-heating degree of gas refrigerant discharged from the compressor, refrigerant staying in the condenser is controlled so that refrigerant amount circulating in the refrigerant cycle is suitably controlled. Thus, heating capacity of the refrigerant cycle using the gas refrigerant bypass passage is improved, while the compressor is protected.

대표청구항 ▼

[ What is claimed is:] [1.] A refrigerant cycle comprising:a compressor for compressing refrigerant, said compressor having a discharge port for discharging refrigerant;a condenser for condensing gas refrigerant discharged from said compressor;a first press-reducing unit for reducing a pressure of r

[ What is claimed is:] [1.] A refrigerant cycle comprising:a compressor for compressing refrigerant, said compressor having a discharge port for discharging refrigerant;a condenser for condensing gas refrigerant discharged from said compressor;a first press-reducing unit for reducing a pressure of refrigerant from said condenser;a heat exchanger for evaporating refrigerant from said first press-reducing unit;a bypass duct connected to said discharge port of said compressor and an inlet of said heat exchanger, said bypass duct forming a bypass passage through which refrigerant discharged from said compressor is introduced into said heat exchanger while bypassing said condenser;a second press-reducing unit, disposed in said bypass passage, for reducing pressure of refrigerant from said compressor;a valve unit for switching a communication between said discharge port of said compressor and an inlet of said condenser, and a communication between said discharge port of said compressor and said bypass passage;super-heating signal detecting means for detecting a signal corresponding to a super-heating degree of refrigerant discharged from said compressor; andcontrol means for determining said super-heating degree based on the signal from said super-heating signal detecting means, and for controlling said valve unit to control refrigerant amount compressed in said compressor according to said super-heating degree.