Refrigerant flow-amount controlling device and ejector refrigerant cycle system using the same

A refrigerant flow-amount controlling device for an ejector refrigerant cycle system having a compressor for compressing refrigerant and a radiator for cooling high-temperature high-pressure refrigerant discharged from the compressor, the refrigerant from the radiator being divided at a branch portion into a first stream and a second stream, the refrigerant flow-amount control device comprising:

• an ejector having a nozzle portion for decompressing refrigerant of the first stream, and a refrigerant suction port from which refrigerant is drawn by a high-speed flow of refrigerant jetted from the nozzle portion;
• a first evaporator for evaporating refrigerant flowing out of the ejector;
• a throttle means for decompressing and expanding refrigerant of the second stream;
• and
• a second evaporator, disposed downstream of the throttle means and upstream of the refrigerant suction portion, for evaporating refrigerant, wherein
• one of the ejector and the throttle means adjusts its refrigerant passage area based on a temperature of refrigerant on a downstream side of the radiator such that a pressure of refrigerant on the downstream side of the radiator approaches a predetermined value, and
• the other one of the ejector and the throttle means has a temperature-sensitive deformation member that changes a refrigerant passage area of the other one thereof to adjust a flow ratio of a first refrigerant flow amount decompressed by the nozzle portion of the ejector and a second refrigerant flow amount drawn into the refrigerant suction port of the ejector.

A refrigerant flow-amount controlling device for an ejector refrigerant cycle system having a compressor for compressing refrigerant and a radiator for cooling high-temperature high-pressure refrigerant discharged from the compressor, the refrigerant from the radiator being divided at a branch portion into a first stream and a second stream, the refrigerant flow-amount control device comprising:

• an ejector having a nozzle portion for decompressing refrigerant of the first stream, a refrigerant suction port from which refrigerant is drawn by a high-speed flow of refrigerant jetted from the nozzle portion, a diffuser portion in which the pressure of mixed refrigerant of the refrigerant jetted from the nozzle portion and the refrigerant drawn from the refrigerant suction port is increased by a pressure increasing amount;
• a first evaporator for evaporating refrigerant flowing out of the ejector;
• a throttle means for decompressing and expanding refrigerant of the second stream;
• a second evaporator, disposed downstream of the throttle means and upstream of the refrigerant suction portion, for evaporating refrigerant;
• and
• adjusting means for adjusting a flow ratio of a first refrigerant flow amount flowing into the nozzle portion and a second refrigerant flow amount drawn into the refrigerant suction port, based on the pressure increasing amount in the diffuser portion of the ejector.

An ejector refrigerant cycle system having a refrigerant cycle through which refrigerant circulates, comprising:

• a compressor for compressing refrigerant;
• a radiator for cooling high-temperature high-pressure refrigerant discharged from the compressor;
• a branch portion located to divide the refrigerant from the radiator into a first stream and a second stream;
• an ejector having a nozzle portion for decompressing refrigerant of the first stream, and a refrigerant suction port from which refrigerant is drawn by a high-speed flow of refrigerant jetted from the nozzle portion;
• a first evaporator for evaporating refrigerant flowing out of the ejector;
• a throttle means for decompressing and expanding refrigerant of the second stream;
• a second evaporator, disposed downstream of the throttle means and upstream of the refrigerant suction portion, for evaporating refrigerant;
• and
• an adjusting mechanism having a temperature-sensitive deformation member that is deformed in accordance with a variation in a refrigerant temperature of the refrigerant cycle to adjust one refrigerant passage area of the nozzle portion and the throttle means,
• wherein the adjusting mechanism is provided to adjust a flow ratio of a first refrigerant flow amount decompressed by the nozzle portion of the ejector and a second refrigerant flow amount drawn into the refrigerant suction port of the ejector.

An ejector refrigerant cycle system having a refrigerant cycle through which refrigerant circulates, comprising:

• a compressor for compressing refrigerant;
• a radiator for cooling high-temperature high-pressure refrigerant discharged from the compressor;
• a branch portion located to divide the refrigerant from the radiator into a first stream and a second stream;
• an ejector having a nozzle portion for decompressing refrigerant of the first stream, and a refrigerant suction port from which refrigerant is drawn by a high-speed flow of refrigerant jetted from the nozzle portion;
• a first evaporator for evaporating refrigerant flowing out of the ejector;
• a throttle means for decompressing and expanding refrigerant of the second stream;
• and
• a second evaporator, disposed downstream of the throttle means and upstream of the refrigerant suction portion, for evaporating refrigerant, wherein
• one of the ejector and the throttle means adjusts its refrigerant passage area based on a temperature of refrigerant on a downstream side of the radiator such that a pressure of refrigerant on the downstream side of the radiator approaches a predetermined value, and
• the other one of the ejector and the throttle means has a temperature-sensitive deformation member that changes a refrigerant passage area of the other one thereof to adjust a flow ratio of a first refrigerant flow amount decompressed by the nozzle portion of the ejector and a second refrigerant flow amount drawn into the refrigerant suction port of the ejector.

An ejector refrigerant cycle system having a refrigerant cycle through which refrigerant circulates, comprising:

• a compressor for compressing refrigerant;
• a radiator for cooling high-temperature high-pressure refrigerant discharged from the compressor;
• a branch portion located to divide the refrigerant from the radiator into a first stream and a second stream;
• an ejector having a nozzle portion for decompressing refrigerant of the first stream, a refrigerant suction port from which refrigerant is drawn by a high-speed flow of refrigerant jetted from the nozzle portion, a diffuser portion in which the pressure of mixed refrigerant of the refrigerant jetted from the nozzle portion and the refrigerant drawn from the refrigerant suction port is increased by a pressure increasing amount;
• a first evaporator for evaporating refrigerant flowing out of the ejector;
• a throttle means for decompressing and expanding refrigerant of the second stream;
• a second evaporator, disposed downstream of the throttle means and upstream of the refrigerant suction portion, for evaporating refrigerant;
• and
• adjusting means for adjusting a flow ratio of a first refrigerant flow amount flowing into the nozzle portion and a second refrigerant flow amount drawn into the refrigerant suction port, based on the pressure increasing amount in the diffuser portion of the ejector.