| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump cycle switchable between a gas injection cycle and a normal cycle, capable of solving at least one of various problems during an operation for filling the cycle with refrigerant.SOLUTION: A heat pump cycle 10 comprises: a high-pressure-side communication path 27 communicating a high-pressure refrigerant path in which refrigerant equal in pressure to the refrigerant discharged from a discharge port 11c of a compressor 11 flows with an intermediate-pressure refrigerant path 15 among refrigerant paths in the cycle 10; and a high-pressure-side check valve 271 opening the high-pressure-side communication path 27 when a refrigerant filling operation is carried out. The heat pump cycle 10 further comprises: a low-pressure-side communication path 28 communicating a low-pressure refrigerant path in which the refrigerant equal in pressure to the refrigerant attracted into an intake port 11b of the compressor 11 with the intermediate-pressure refrigerant path 15 among the refrigerant paths in the cycle 10; and a low-pressure-side check valve 281 opening the low-pressure-side communication path 28 when the refrigerant filling operation is carried out. |
