Ejector-type refrigeration cycle device

Abstract

When intended to increase a refrigerant discharge capacity of a compressor in an ejector refrigeration cycle device at start-up of the compressor, the refrigerant discharge capacity is increased in such a manner that an increase amount in the refrigerant discharge capacity of the compressor per predetermined time period is lower than a maximum capacity increase amount per predetermined time period enabled by the compressor. Thus, even if a gas-liquid two-phase refrigerant flows into a refrigerant inflow passage forming a swirling-flow generating portion, the flow velocity of the gas-liquid two-phase refrigerant is prevented from becoming high, so that it can reduce friction noise that would be caused when the gas-liquid two-phase refrigerant circulates through the refrigerant inflow passage, further suppressing the generation of noise from the ejector.

1 . An ejector refrigeration cycle device, comprising:
 a compressor that compresses and discharges a refrigerant;   a radiator that dissipates heat from the refrigerant discharged from the compressor;   a swirling-flow generating portion that generates a swirling flow in the refrigerant flowing out of the radiator;   an ejector including a body portion, the body portion being provided with a nozzle portion that decompresses the refrigerant flowing out of the swirling-flow generating portion, a refrigerant suction port that draws a refrigerant by a suction effect of the injection refrigerant injected from the nozzle portion at a high velocity, and a pressurizing portion that mixes the injection refrigerant with the suction refrigerant drawn from the refrigerant suction port to pressurize the mixed refrigerant;   an evaporator that evaporates the refrigerant, and allows the evaporated refrigerant to flow out to the refrigerant suction port; and   a discharge-capacity control unit that controls a refrigerant discharge capacity of the compressor, wherein   the swirling-flow generating portion is configured to have a part forming a swirl space in a rotator shape, and a part forming a refrigerant inflow passage through which the refrigerant flows along a peripheral sidewall of the swirl space and flows into the swirl space, and   the discharge-capacity control unit increases the refrigerant discharge capacity of the compressor in such a manner that an increase amount in the refrigerant discharge capacity of the compressor per predetermined time period is lower than a reference capacity increase amount at start-up of the compressor.   
     
     
         2 . The ejector refrigeration cycle device according to  claim 1 , wherein
 the reference capacity increase amount is a maximum capacity increase amount per predetermined time period, enabled by the compressor.   
     
     
         3 . An ejector refrigeration cycle device, comprising:
 a compressor that compresses and discharges a refrigerant;   a radiator that dissipates heat from the refrigerant discharged from the compressor;   a swirling-flow generating portion that generates a swirling flow in the refrigerant flowing out of the radiator;   an ejector including a body portion, the body portion being provided with a nozzle portion that decompresses the refrigerant flowing out of the swirling-flow generating portion, a refrigerant suction port that draws a refrigerant by a suction effect of the injection refrigerant injected from the nozzle portion at a high velocity, and a pressurizing portion that mixes the injection refrigerant with the suction refrigerant drawn from the refrigerant suction port to pressurize the mixed refrigerant;   an evaporator that evaporates the refrigerant, and allows the evaporated refrigerant to flow out to the refrigerant suction port; and   an inflow rate adjustment portion that adjusts an inflow rate of the refrigerant flowing into the swirling-flow generating portion, wherein   the swirling-flow generating portion is configured to have a part forming a swirl space in a rotator shape, and a part forming a refrigerant inflow passage through which the refrigerant flows along a peripheral sidewall of the swirl space and flows into the swirl space, and   the inflow rate adjustment portion increases the refrigerant inflow rate in such a manner that an increase amount in the refrigerant inflow rate per predetermined time period is lower than a reference flow-rate increase amount at start-up of the compressor.   
     
     
         4 . The ejector refrigeration cycle device according to  claim 3 , wherein
 the reference flow-rate increase amount is a maximum flow-rate increase amount per predetermined time period, enabled by the inflow rate adjustment portion.   
     
     
         5 . The ejector refrigeration cycle device according to  claim 3 , wherein
 the inflow rate adjustment portion is disposed in a refrigerant flow path that leads from a refrigerant outlet of the radiator to an inlet of the swirling-flow generating portion.   
     
     
         6 . The ejector refrigeration cycle device according to  claim 3 , further comprising
 a gas-liquid separation portion that separates the refrigerant flowing out of the pressurizing portion into gas and liquid phase refrigerants, wherein   the inflow rate adjustment portion is disposed in a refrigerant flow path that leads from a gas-phase refrigerant outflow port of the gas-liquid separation portion to a suction port of the compressor.   
     
     
         7 . The ejector refrigeration cycle device according to  claim 3 , wherein
 the inflow rate adjustment portion is configured of an electric flow-rate adjustment valve.