Refrigerant cycle with ejector having throttle changeable nozzle

A refrigerant cycle comprising:

• a gas-liquid separator for separating refrigerant into gas refrigerant and liquid refrigerant;
• an evaporator in which the liquid refrigerant flowing from the gas-liquid separator is evaporated after being decompressed;
• a compressor for compressing the gas refrigerant from the gas-liquid separator;
• a radiator which cools the refrigerant discharged from the compressor;
• an ejector including
• a high-pressure refrigerant inlet port from which refrigerant from the radiator is introduced,
• a low-pressure refrigerant inlet port from which refrigerant from the evaporator is sucked,
• a nozzle for decompressing refrigerant introduced from the high-pressure refrigerant inlet port, and
• a pressure-increasing portion in which refrigerant from the evaporator is sucked through the low-pressure refrigerant inlet port by a flow of refrigerant jetted from the nozzle and is mixed with the refrigerant jetted from the nozzle, the pressure-increasing portion having a refrigerant outlet from which refrigerant is discharged to the gas-liquid separator;
• and
• a throttle control system including
• a bypass passage diverged from a refrigerant passage at a diverging point that is upstream from the high-pressure refrigerant inlet port, and being joined to the refrigerant passage at a join point that is downstream from the diverging point,
• a control valve for controlling a pressure of the refrigerant flowing through the bypass passage, and
• a pilot valve that controls of a throttle opening degree of the nozzle in accordance with a pressure difference between the refrigerant in the bypass passage and the refrigerant in the high-pressure refrigerant inlet port of the ejector.