To provide a heat pump system for a vehicle air-conditioner in which a temperature (degree of superheat) of a coolant discharged from a compressor can be prevented from being excessively increased in a heating operation.SOLUTION: A heat pump system (HP) is provided as follows: a first branch flow path (BC1) including a compressor (C) and an indoor heat exchanger (HXC2) on a coolant circuit (RC), in which a first expansion mechanism (EX1) capable of adjusting an opening and a first endothermic heat exchanger (HXA1) are serially arranged, and a second branch flow path (BC2) where a second expansion mechanism (EX2) capable of adjusting the opening and a second endothermic heat exchanger (HXA2) are serially arranged, are arranged in parallel on a coolant circuit from the indoor heat exchanger to the compressor; the opening of the first expansion mechanism is always set larger than zero during a heating operation; and the opening of the second expansion mechanism is set larger than zero only when a degree of superheat or a temperature of the coolant inhaled to the compressor or the coolant discharged from the compressor becomes an upper-limit value or more.SELECTED DRAWING: Figure 1

    【課題】暖房運転時に、圧縮機から吐出される冷媒の温度(過熱度)が過剰に上昇することを防止し得る車両空調装置用ヒートポンプシステムを提供する。【解決手段】ヒートポンプシステム(HP)は、圧縮機(C)と、室内熱交換器(HXC2)とを冷媒回路(RC)上に備え、開度調整可能な第1膨張機構(EX1)と第1吸熱用熱交換器(HXA1)が直列に配置された第1分岐流路(BC1)と、開度調整可能な第2膨張機構(EX2)と第2吸熱用熱交換器(HXA2)が直列に配置された第2分岐流路(BC2)とが、室内熱交換器から圧縮機へ至る冷媒回路上に並列に配置されており、暖房運転中、第1膨張機構の開度は、常にゼロより大きく設定されており、第2膨張機構の開度は、圧縮機へ吸入される冷媒または圧縮機から吐出される冷媒の過熱度または温度が上限値以上となった場合にのみゼロより大きく設定される。【選択図】図1


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    Title :

    HEAT PUMP SYSTEM FOR VEHICLE AIR-CONDITIONER


    Additional title:

    車両空調装置用ヒートポンプシステム


    Contributors:

    Publication date :

    2020-03-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F25B Kältemaschinen, Kälteanlagen oder Kälteverfahren , REFRIGERATION MACHINES, PLANTS, OR SYSTEMS / B60H ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES , Anordnung oder Einbau der Heizung, Kühlung, Lüftung oder anderer Luftbehandlungsvorrichtungen für die Fahrzeugräume für Reisende oder Fracht



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