Patent ID: 6931887

Claim:
An ejector decompression device for a vapor compression refrigerant cycle that includes a compressor for compressing refrigerant, a refrigerant radiator for cooling refrigerant discharged from the compressor and an evaporator for evaporating low-pressure refrigerant after being decompressed, the ejector decompression device comprising: a nozzle which decompresses refrigerant flowing out of the refrigerant radiator by converting pressure energy of the refrigerant to speed energy thereof; and a pressure increasing portion which increases a pressure of refrigerant by converting the speed energy of the refrigerant to the pressure energy thereof while refrigerant jetted from the nozzle to an inlet of the pressure increasing portion and refrigerant drawn from the evaporator are mixed, wherein a coaxial degree of the nozzle with respect to the pressure increasing portion is equal to or lower than 30% of a diameter of the pressure increasing portion at the inlet of the pressure increasing portion.