| 摘要 |
<p>This heat-pump-type heating device comprises: an indoor-side heat exchanger (26); an outdoor-side heat exchanger (27); a low-pressure-side compressor (31) and a high-pressure-side compressor (32) that compress, in order, a refrigerant sent from the outdoor-side heat exchanger (27); a first decompression device (36) that decompresses the refrigerant sent from the indoor-side heat exchanger (26); a gas-liquid separator (38) that separates the refrigerant sent from the first decompression device (36) into a gas phase and a liquid phase; a second decompression device (37) that is connected to the liquid-phase side of the gas-liquid separator (38) and that decompresses the refrigerant sent from the gas-liquid separator (38); an injection pipeline (51) that is connected to the gas-phase side of the gas-liquid separator (38) and that guides the refrigerant sent from the gas-liquid separator (38) to a point between the low-pressure-side compressor (31) and the high-pressure-side compressor (32); and a control unit (46) that controls the decompression rate of the refrigerant in the second decompression device (37) such that the refrigerant flowing through the injection pipeline (51) is in a gas-liquid two-phase state. With this configuration, a heat-pump-type heating device in which the heating capability is sufficiently improved with a simple configuration is provided.</p> |
