EJECTOR-TYPE REFRIGERATION CYCLE

To provide an ejector-type refrigeration cycle which can store a sufficient amount of cold heat in a cold storage part without unnecessarily improving a cooling capacity.SOLUTION: A flow rate of a refrigerant flowing into a nozzle part 15a of an ejector 15 from a branch part 13 for branching a flow of a high-temperature high-pressure refrigerant is defined as a nozzle-side flow rate Gn, and a flow rate of a refrigerant flowing into a cold-heat heat exchanger 17 being a cold storage part from the branch part 13 is defined as a cold storage-side flow rate Gc. In a normal operation mode, the lowering of a cooling capacity of a flow-out side evaporator 16 for cooling blown air by evaporating the refrigerant flowing out of a diffuser part 15d of the ejector 15 is suppressed by sufficiently lowering a flow rate ratio GC/Gn, and low-temperature cold heat is sufficiently stored in the cold-heat heat exchanger 17 by increasing a pressure boosting amount of the ejector 15. In a cold discharge operation mode, the supply of the refrigerant to the nozzle part 15a is stopped, and a battery 40 is cooled by cold heat which is stored in the cold-heat heat exchanger 17.SELECTED DRAWING: Figure 1 【課題】冷却能力を不必要に向上させることなく、蓄冷部に充分な冷熱を蓄えることのできるエジェクタ式冷凍サイクルを提供する。【解決手段】高温高圧冷媒の流れを分岐する分岐部１３からエジェクタ１５のノズル部１５ａへ流入する冷媒の流量をノズル側流量Ｇｎと定義し、分岐部１３から蓄冷部である蓄冷用熱交換器１７へ流入する冷媒の流量を蓄冷側流量Ｇｃと定義する。通常運転モードでは、流量比Ｇｃ／Ｇｎを充分に低下させることによって、エジェクタ１５のディフューザ部１５ｄから流出した冷媒を蒸発させて送風空気を冷却する流出側蒸発器１６における冷却能力の低下を抑制するとともに、エジェクタ１５の昇圧量を増加させて蓄冷用熱交換器１７に低温の冷熱を充分に蓄える。放冷運転モードでは、ノズル部１５ａへの冷媒の供給を停止して、蓄冷用熱交換器１７に蓄えられた冷熱でバッテリ４０を冷却する。【選択図】図１