| 摘要 |
An air conditioning system (10) includes a refrigerant circuit (20) including a compressor (21), an indoor heat exchanger (22), a first expansion valve (23), a gas-liquid separator (24), a second expansion valve (26), and an outdoor heat exchanger (27) which are sequentially connected together to perform a two-stage expansion refrigeration cycle. The refrigerant circuit (20) further includes: a gas injection pipe (2c) through which intermediate-pressure gas refrigerant in the gas-liquid separator (24) flows into an intermediate port of the compressor (21), and a liquid-gas heat exchanger (25) configured to exchange heat between low-pressure gas refrigerant obtained by evaporating refrigerant in the outdoor heat exchanger (27) and travelling toward the compressor (21) and intermediate-pressure liquid refrigerant travelling from the gas-liquid separator (24) toward the second expansion valve (26). |
