第１室内熱交換器(7)と第２室内熱交換器(8)とが一体化されることによって一体型熱交換器(14)が形成されている。図示は省略したが、一体型熱交換器(14)は、上下に連続して並んだ複数の熱交換管からなる２以上の熱交換パスが設けられており、冷媒は全ての熱交換パスを順次流れる。そして、冷媒の流れ方向の最終熱交換パスを含んだ少なくとも１つの熱交換パス、たとえば最終熱交換パスを液相主体冷媒が流れるようになっており、当該熱交換パスが第２室内熱交換器(8)となり、他の熱交換パスが第１室内熱交換器(7)となっている。
An integrated heat exchanger (14) is formed by integrating the first indoor heat exchanger (7) and the second indoor heat exchanger (8). Although not shown in the figure, the integrated heat exchanger (14) is provided with two or more heat exchange paths composed of a plurality of heat exchange tubes arranged continuously in the vertical direction. It flows sequentially. The liquid phase main refrigerant flows through at least one heat exchange path including the final heat exchange path in the refrigerant flow direction, for example, the final heat exchange path, and the heat exchange path is a second indoor heat exchanger. (8) , and the other heat exchange path is the first indoor heat exchanger (7).
切り替え部材(29)の働きによって、冷房時には、一体型熱交換器(14)が配置された第１分岐通路(27)には空気が流れず、第２分岐通路(28)のみに空気が流されるようになっている。暖房時には、一体型熱交換器(14)が配置された第１分岐通路(27)に空気が流され、第２分岐通路(28)には空気が流れないようになっている。除湿のみを行う除湿時には、一体型熱交換器(14)が配置された第１分岐通路(27)に空気が流され、第２分岐通路(28)には空気が流れないようになっている。なお、上述した暖房時および除湿時において、切り替え部材(29)の切り替え角度を調整することによって、第１分岐通路(27)および第２分岐通路(28)の両方を開いて両分岐通路(27)(28)に空気を流すとともに、両分岐通路(27)(28)を流れる空気の量を調整することもある。この場合、第１分岐通路(27)を通過して一体型熱交換器(14)により加熱された空気と、第２分岐通路(28)を通過した空気とを混合するとともに混合空気の温度を調整することができ、空気吹き出し口(23)から車室内に吹き出される温度を調整することが可能になる。
Due to the action of the switching member (29), during cooling, air does not flow through the first branch passage (27) where the integrated heat exchanger (14) is arranged, but air flows only through the second branch passage (28). It is supposed to be. During heating, air flows through the first branch passage (27) in which the integrated heat exchanger (14) is disposed, and air does not flow through the second branch passage (28). At the time of dehumidification in which only dehumidification is performed, air is caused to flow through the first branch passage (27) where the integrated heat exchanger (14) is disposed, and air is prevented from flowing into the second branch passage (28). . Note that, during the heating and dehumidifying operations described above, by adjusting the switching angle of the switching member (29), both the first branch passage (27) and the second branch passage (28) are opened and both branch passages (27 ) (28), and the amount of air flowing through both branch passages (27) (28) may be adjusted. In this case, the air that has passed through the first branch passage (27) and is heated by the integrated heat exchanger (14) and the air that has passed through the second branch passage (28) are mixed and the temperature of the mixed air is adjusted. It is possible to adjust, and it is possible to adjust the temperature blown out from the air outlet (23) into the vehicle interior.
夏季などの冷房時には、図２に示すように、切り替え部材(29)により第１分岐通路(27)が閉鎖されるとともに第２分岐通路(28)が開かれる。また、第１開閉部材(34)により第２通路部分(32)の下流端部が開かれるとともに、空気戻し通路(33)の上流端部が閉じられ、さらに第２開閉部材(35)により空気戻し通路(33)の下流端部が閉じられる。冷媒は、圧縮機(3)で圧縮された後に、一体型熱交換器(14)の第１室内熱交換器(7)および第２室内熱交換器(8)を順次通過し、室外熱交換器(4)において熱を放熱して凝縮させられる。ついで、冷媒は、減圧器(5)により減圧された後に、エバポレータ(6)において空気通路(24)を流れる空気から熱を奪って蒸発し、その後圧縮機(3)に戻される。エバポレータ(6)により熱を奪われた空気は、第２分岐通路(28)を通って空気吹き出し口(23)から車室内に吹き出される。
During cooling such as in summer, as shown in FIG. 2, the switching member (29) closes the first branch passage (27) and opens the second branch passage (28). Further, the downstream end portion of the second passage portion (32) is opened by the first opening / closing member (34), the upstream end portion of the air return passage (33) is closed, and the air is further opened by the second opening / closing member (35). The downstream end of the return passage (33) is closed. After the refrigerant is compressed by the compressor (3), the refrigerant sequentially passes through the first indoor heat exchanger (7) and the second indoor heat exchanger (8) of the integrated heat exchanger (14) to exchange outdoor heat. In the vessel (4), heat is dissipated and condensed. Next, the refrigerant is depressurized by the decompressor (5), evaporates by taking heat from the air flowing through the air passage (24) in the evaporator (6), and then returned to the compressor (3). The air deprived of heat by the evaporator (6) is blown out from the air outlet (23) into the vehicle compartment through the second branch passage (28).