HEAT PUMP

摘要

A first bypass pipe (6 )whose one end of the first bypass pipe (6) is connected to a main pipe (5) extending from a compressor (1) to an indoor heat exchanger (2), and whose the other end is branched off into parts that are each connected to the main pipe (5) on the inlet side of outdoor heat exchanger (4A, 4B) and a second bypass pipe (40) whose one end of the second bypass pipe (40) is connected to an injection port (43) communicating with the compression chamber of the compressor (1) in which compression is taking place and whose the other end is branched off into parts that are each connected to the main pipe (5) on the outlet side of the outdoor heat exchangers (4A, 4B) are provided. During a defrosting operation that removes frost on the outdoor heat exchangers (4A, 4B), a part of the refrigerant discharged from the compressor (1) is supplied from the first bypass pipe (6) to the outdoor heat exchanger to be defrosted, and is then passed through the second bypass pipe (40) and injected from the injection port (43) of the compressor (1).