초록 ▼

An ejector cycle device includes an ejector having a nozzle portion which decompresses refrigerant flowing out of a radiator, a first evaporator for evaporating refrigerant from the ejector, and a second evaporator provided in a branch passage that is branched from a position between the refrigerant

An ejector cycle device includes an ejector having a nozzle portion which decompresses refrigerant flowing out of a radiator, a first evaporator for evaporating refrigerant from the ejector, and a second evaporator provided in a branch passage that is branched from a position between the refrigerant radiator and the ejector and is connected to a refrigerant suction port of the ejector. Furthermore, a throttle member is disposed in the branch passage to decompress refrigerant and adjust a flow amount of refrigerant, and the second evaporator is disposed in the branch passage between the throttle member and the refrigerant suction port. In the ejector cycle device having both the first and second evaporators, a defrosting operation of one the first and second evaporators can be performed while the other one of the first and second evaporators is operated to have a cooling function.

대표청구항 ▼

What is claimed is: 1. An ejector cycle device comprising: a compressor for compressing refrigerant; a refrigerant radiator disposed to radiate heat of refrigerant discharged from the compressor; an ejector including a nozzle portion which decompresses refrigerant flowing out of the refrigerant rad

What is claimed is: 1. An ejector cycle device comprising: a compressor for compressing refrigerant; a refrigerant radiator disposed to radiate heat of refrigerant discharged from the compressor; an ejector including a nozzle portion which decompresses refrigerant flowing out of the refrigerant radiator by converting pressure energy of the refrigerant to speed energy thereof, the ejector having a refrigerant suction port from which refrigerant is drawn by a refrigerant stream jetted from the nozzle portion; a first evaporator for evaporating refrigerant flowing out of the ejector, the first evaporator having a refrigerant outlet coupled to a refrigerant suction side of the compressor; a branch passage, which is branched from a position between a refrigerant downstream side of the refrigerant radiator and the ejector, and is connected to the refrigerant suction port of the ejector; a throttle member disposed in the branch passage to decompress refrigerant and adjust a flow amount of refrigerant; a second evaporator disposed in the branch passage between the throttle member and the refrigerant suction port; and a defrosting means which is provided to perform a defrosting operation of one of the first and second evaporators while the other one of the first and second evaporators is operated to have a cooling function. 2. The ejector cycle device according to claim 1, wherein: the defrosting means is a shutting means provided in the throttle member; and the shutting means shuts a flow of refrigerant to the second evaporator when the defrosting operation of the second evaporator is performed. 3. The ejector cycle device according to claim 1, wherein the defrosting means is a bypass circuit, which is provided such that refrigerant bypasses the second evaporator during the defrosting operation. 4. The ejector cycle device according to claim 3, wherein the bypass circuit includes a passage switching member located at an upstream position of the second evaporator, and a bypass passage through which refrigerant bypasses the second evaporator during the defrosting operation. 5. The ejector cycle device according to claim 1, wherein the defrosting means is a bypass circuit, which is provided such that refrigerant bypasses the first evaporator during the defrosting operation. 6. The ejector cycle device according to claim 5, wherein the bypass circuit includes a passage switching member located between the ejector and an upstream position of the first evaporator, and a bypass passage through which refrigerant bypasses the first evaporator during the defrosting operation. 7. The ejector cycle device according to claim 5, wherein the bypass circuit includes a passage switching member located in the branch passage between the second evaporator and the refrigerant suction port, and a bypass passage through which refrigerant from the second evaporator bypasses the ejector and the first evaporator during the defrosting operation of the first evaporator. 8. The ejector cycle device according to claim 1, wherein the nozzle portion is a variable nozzle in which a throttle open degree of the nozzle portion is variable. 9. The ejector cycle device according to claim 1, further comprising an electromagnetic valve arranged between the refrigerant radiator and the ejector to open and close a refrigerant passage between the refrigerant radiator and the ejector. 10. The ejector cycle device according to claim 1, wherein the refrigerant is one of chlorofluorocarbon refrigerant, hydrocarbon refrigerant and carbon dioxide refrigerant. 11. An ejector cycle device comprising: a compressor for compressing refrigerant; a refrigerant radiator disposed to radiate heat of refrigerant discharged from the compressor; an ejector including a nozzle portion which decompresses refrigerant flowing out of the refrigerant radiator by converting pressure energy of the refrigerant to speed energy thereof, the ejector having a refrigerant suction port from which refrigerant is drawn by a refrigerant stream jetted from the nozzle portion; a first evaporator for evaporating refrigerant flowing out of the ejector, the first evaporator having a refrigerant outlet coupled to a refrigerant suction side of the compressor; a first branch passage, which is branched from a position between a refrigerant downstream side of the refrigerant radiator and the ejector, and is connected to the refrigerant suction port of the ejector; a throttle member disposed in the first branch passage to decompress refrigerant and adjust a flow amount of refrigerant; a second evaporator disposed in the first branch passage between the throttle member and the refrigerant suction port; and a bypass circuit which is provided such that refrigerant from the second evaporator is introduced to the refrigerant suction side of the compressor while bypassing the first evaporator. 12. The ejector cycle device according to claim 11, wherein the bypass circuit includes a passage switching member located in the first branch passage at a position between the second evaporator and the refrigerant suction port, and a bypass passage connected to the passage switching member and a position downstream from the first evaporator. 13. The ejector cycle device according to claim 11, wherein the bypass circuit includes a passage switching member arranged at a position between a downstream side of the ejector and the first evaporator, and a bypass passage connected to the passage switching member and a position downstream from the first evaporator. 14. The ejector cycle device according to claim 12, wherein the passage switching member is a three-way valve. 15. The ejector cycle device according to claim 11, further comprising: a second branch passage which is branched from the first branch passage at an upstream side of the throttle member in the branch passage, and is connected to a downstream side of the first evaporator; an opening/closing member provided to open and close the second branch passage; a throttle valve disposed in the second branch passage to decompress refrigerant and to adjust a flow amount of refrigerant flowing through the second branch passage; and a third evaporator disposed in the second branch passage to evaporate refrigerant decompressed in the throttle valve. 16. The ejector cycle device according to claim 11, further comprising: a second branch passage which is branched from a position between a discharge port of the ejector and the first evaporator, and is connected to a downstream side of the first evaporator; an opening/closing member provided to open and close the second branch passage; and a third evaporator disposed in the second branch passage to evaporate refrigerant flowing from the discharge port of the ejector.