|
(11) | EP 2 339 269 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Air conditioner |
| (57) In an air conditioner having a double-pipe heat exchanger in a refrigerating cycle,
the degree of opening of a bypass expansion valve is controlled easily without liquid
return to a compressor and without considering the state of a low-pressure two-phase
refrigerant in the double-pipe heat exchanger. In the air conditioner including a
refrigerating cycle 1A in which a heating expansion valve 51 is provided between the
outdoor heat exchanger 30 and the double-pipe heat exchanger 60; a cooling expansion
valve 52 is provided between the indoor heat exchanger 40 and the double-pipe heat
exchanger 60; and in the double-pipe heat exchanger 60, a high-pressure liquid refrigerant
flowing in a liquid-side refrigerant pipe 50 is heat-exchanged with a low-pressure
two-phase refrigerant that is formed by decompressing some of the high-pressure liquid
refrigerant by a bypass expansion valve 62, a low-pressure refrigerant outflow portion
60a of the double-pipe heat exchanger 60 is connected to a refrigerant pipe portion
50a between the outdoor heat exchanger 30 and the heating expansion valve 51 via a
first check valve 71, and is connected to a refrigerant pipe portion 50b between the
indoor heat exchanger 40 and the cooling expansion valve 52 via a second check valve
72.
|