Vapor compression refrigerating cycle apparatus

Abstract

A vapor compression refrigerating cycle apparatus includes a compressor, a radiator, a first decompressing device, a second decompressing device, a flow distributor, an ejector, and a suction-side evaporator. The vapor compression refrigerating cycle apparatus is configured such that refrigerant pressure (P0) at an inlet of the first decompressing device, refrigerant pressure (P) at an inlet of a nozzle portion of the ejector, refrigerant pressure (P2) at an outlet of the nozzle portion satisfy a pressure relationship of 0.1×(P0−P2)≦(P0−P)≦0.6×(P0−P2). Alternative to or in addition to the pressure relationship, the vapor compression refrigerating cycle apparatus is configured such that a dryness of refrigerant at the inlet of the nozzle portion is in a range between 0.003 and 0.14.

1 . A vapor compression refrigerating cycle apparatus comprising:
 a compressor that draws and compresses refrigerant;   a radiator that radiates heat of refrigerant discharged from the compressor;   a first decompressing device that decompresses refrigerant downstream of the radiator;   a flow distributor that separates refrigerant decompressed by the first decompressing device into at least a first flow and a second flow;   an ejector that includes a nozzle portion and a suction portion, the nozzle portion that draws refrigerant of the first flow and decompresses and expands the refrigerant of the first flow to generate a refrigerant jet flow, the suction portion that draws refrigerant of the second flow by the refrigerant jet flow from the nozzle portion;   a second decompressing device that decompresses the refrigerant of the second flow; and   a suction-side evaporator that evaporates refrigerant decompressed by the second decompressing device and discharges evaporated refrigerant toward the suction portion of the ejector, wherein it is configured that refrigerant pressure (P 0 ) at an inlet of the first decompressing device, refrigerant pressure (P) at an inlet of the nozzle portion, refrigerant pressure (P 2 ) at an outlet of the nozzle portion satisfy a pressure relationship of 0.1×(P 0 −P 2 )≦(P 0 −P)≦0.6×(P 0 −P 2 ).   
   
   
       2 . The vapor compression refrigerating cycle apparatus according to  claim 1 , wherein it is configured that the refrigerant at an inlet of the nozzle portion has a dryness in a range between 0.003 and 0.14. 
   
   
       3 . The vapor compression refrigerating cycle apparatus according to  claim 2 , wherein
 the flow distributor has a distribution rate adjusting part that adjusts flow rates of the first and second flows, and   the dryness of the refrigerant is adjusted by the distribution rate adjusting part.   
   
   
       4 . The vapor compression refrigerating cycle apparatus according to  claim 1 , wherein
 the pressure relationship is achieved by adjusting a throttle degree of at least one of the first decompressing device, the second decompressing device and the nozzle portion of the ejector.   
   
   
       5 . The vapor compression refrigerating cycle apparatus according to  claim 1 , further comprising:
 a discharge-side evaporator that evaporates refrigerant discharged from the ejector.   
   
   
       6 . The vapor compression refrigerating cycle apparatus according to  claim 1 , further comprising:
 an internal heat exchanger that performs heat exchange between refrigerant discharged from the radiator and refrigerant discharged from the ejector.   
   
   
       7 . A vapor compression refrigerating cycle apparatus comprising:
 a compressor that draws and compresses refrigerant;   a radiator that radiates heat of refrigerant discharged from the compressor;   a first decompressing device that decompresses refrigerant downstream of the radiator;   a flow distributor that separates refrigerant decompressed by the first decompressing device into at least a first flow and a second flow;   an ejector that includes a nozzle portion and a suction portion, the nozzle portion that draws refrigerant of the first flow and decompresses and expands the refrigerant of the first flow to generate a refrigerant jet flow, the suction portion that draws refrigerant of the second flow by the refrigerant jet flow from the nozzle portion;   a second decompressing device that decompresses the refrigerant of the second flow; and   a suction-side evaporator that evaporates refrigerant decompressed by the second decompressing device and discharges evaporated refrigerant toward the suction portion of the ejector, wherein   it is configured that the refrigerant at an inlet of the nozzle portion has a dryness in a range between 0.003 and 0.14.   
   
   
       8 . The vapor compression refrigerating cycle apparatus according to  claim 7 , wherein
 the flow distributor has a distribution rate adjusting part that adjusts flow rates of the first and second flows, and   the dryness of the refrigerant is adjusted by the distribution rate adjusting part.   
   
   
       9 . The vapor compression refrigerating cycle apparatus according to  claim 7 , further comprising:
 a discharge-side evaporator that evaporates refrigerant discharged from the ejector.   
   
   
       10 . The vapor compression refrigerating cycle apparatus according to  claim 7 , further comprising:
 an internal heat exchanger that performs heat exchange between refrigerant discharged from the radiator and refrigerant discharged from the ejector.