| 摘要 |
<p>A compressor (21), an outdoor heat exchanger (23), an electric expansion valve (25) through which a refrigerant flows in the opposite directions, and an indoor heat exchanger (31) are connected to form a reversely operable refrigerant circuit (1). Between the electric expansion valve (25) and indoor heat exchanger (31), a refrigerant regulator (4) is provided which is adapted to regulate a circulation rate of a refrigerant during a room heating operation cycle. The refrigerant regulator (4) is provided with a first outflow/inflow pipe (42) to which the outdoor heat exchanger (23) is connected, a plurality of refrigerant ports (45, 45, ...), and a second outflow; inflow pipe (43) to which the indoor heat exchanger (31) is connected. An opening action control means (73) is also provided which is adapted to control the opening of the electric expansion valve (25) to a high level when the pressure HP of the high-pressure refrigerant in the refrigerant circulating circuit (1) has reached predetermined level. This enables an accumulator to be omitted, the permissible range of charge of refrigerant to be increased, and an increase in the pressure of high-pressure refrigerant to be prevented.</p> |
