Patent ID: 7168257
Filing Date: 2007-01-30
Classification: F01C,F04C,F25B,Y10T

Abstract:
1. A refrigerant circuit comprising a multi-stage compression type rotary compressor including an electrical-power element and first and second rotary compression elements driven by this electrical-power element in a sealed vessel in such a configuration that a refrigerant compressed at the first rotary compression element is then compressed at the second rotary compression element, a gas cooler into which the refrigerant discharged from the second rotary compression element of this multi-stage compression type rotary compressor flows, a first decompression device connected to an outlet side of this gas cooler, and an evaporator connected to an outlet side of this first decompression device in such a configuration that the refrigerant discharged from the evaporator is compressed at the first rotary compression element, the refrigerant circuit further comprising: a defroster according to the present invention comprises a defrosting circuit for supplying the evaporator with the refrigerant discharged from the first and second rotary compression elements without decompressing the refrigerant, a first flow-path control device which controls flow of the refrigerant through the defrosting circuit, a second decompression device provided along a refrigerant path for supplying the second rotary compression element with the refrigerant discharged from the first rotary compression element, and a second flow-path control device which controls whether the refrigerant is allowed to flow through this second decompression device or the refrigerant is allowed to bypass it, wherein the second flow-path control device allows the refrigerant to flow through the second decompression device, when the first flow-path control device allows the refrigerant to flow through the defrosting circuit.