To carry out appropriate oil equalizing control of a compressor in a heat pump device mounted with a plurality of compressors and an expander of an integral type with any of the compressors.
In the heat pump device, a compression part connecting a first compressor 2 and a second compressor 1 in parallel, a radiator 4, the expander 5 being an integral type with the second compressor 2, and an evaporator 6 are annularly connected in sequence to circulate a refrigerant. It is characterized by that it has a first pressure-reducing means 7 provided in a discharge part of the first compressor 1, a second pressure reducing means 8 provided in a discharge part of the second compressor 2, and an oil equalizing tube 9 connecting the first and second compressors 1, 2, and the oil equalizing control is carried out by alternately operating the first and second pressure reducing means 7, 8.
KUSUMARU YUICHI
HONMA MASAYA
MATSUMOTO KO
Hiroki Naito
Daisuke Nagano