| 摘要 |
A heat pump-type heating device includes an indoor heat exchanger (26), a low-pressure side compressor (31), a high-pressure side compressor (32), a first decompressor (36) configured to decompress the refrigerant delivered from the indoor heat exchanger (26), a gas-liquid separator (38) configured to separate the refrigerant delivered from the first decompressor (36) into a gas phase and a liquid phase, a second decompressor (37) connected to the liquid-phase side of the gas-liquid separator (38) and configured to decompress the refrigerant delivered form the gas-liquid separator (38) and deliver the decompressed refrigerant to an outdoor heat exchanger (27), an injection pipeline (51) connected to the gas-phase side of the gas-liquid separator (38) and configured to guide the refrigerant delivered from the gas-liquid separator (38) to a pipeline between the low-pressure side compressor (31) and the high-pressure side compressor (32), and a control unit (46) configured to control a decompression ratio of the refrigerant in the second decompressor (37) so as to render the refrigerant that flows into the high-pressure side compressor (32) into a superheated gas state or a saturated vapor state. Provided with such configuration, it is expected to sufficiently improve the heating ability of the heat pump-type heating device. |
