Patent ID: 7370493

Claim:
A vapor compression refrigerating system configured to operate at a supercritical condition, comprising: a compressor for compressing a refrigerant; a radiator for reducing a temperature of refrigerant with an elevated temperature and an elevated pressure after the refrigerant passes through the compressor; a first pressure-reducing means for reducing a pressure of refrigerant after the refrigerant passes through the radiator; a refrigerant branching means for dividing refrigerant into a plurality of portions after the refrigerant is reduced in pressure by the first pressure-reducing means; a second pressure-reducing means for reducing a pressure of a first portion of the refrigerant divided by the refrigerant branching means; and a third pressure-reducing means for reducing a pressure of a second portion of the refrigerant divided by the refrigerant branching means; a cooler, wherein after the first portion of the refrigerant passes through the second pressure-reducing means, the first portion of the refrigerant exchanges heat with the refrigerant flowing between the first pressure-reducing means and the third pressure-reducing means; an evaporator, wherein after the second portion of the refrigerant passes through the third pressure-reducing means, the second portion of the refrigerant is evaporated; and a gas/liquid separator, in which the evaporated refrigerant and the first portion of the refrigerant are mixed and a refrigerant gas component is separated from a liquid refrigerant component of the mixed refrigerant and from which the mixed refrigerant flows into the compressor.