To provide a refrigeration cycle device that can surely return refrigerator oil to a compressor, even if liquid in an accumulator is separated to two layers.
The refrigeration cycle device includes a plurality of outdoor units each of which accommodates the compressor, an outdoor heat exchanger and the accumulator, and an oil return pipe which forms a refrigeration cycle by connecting these apparatuses, a pressure reduction device and an indoor heat exchanger through refrigerant piping, and returns the liquid accumulated in the accumulator to the compressor. The refrigeration cycle device also includes bypass piping which connects the accumulators and serves as a flow-in/out passage of the liquid which is accumulated in the accumulator, a valve device arranged in the bypass piping, and a control device which controls an operation frequency of the compressor and the opening and closing of the valve device, while the valve device is opened, the control device performs a stirring operation for repeating an operation which is performed at an operation frequency higher than the operation frequency of the other compressor with respect to each compressor, and an operation which is performed at an operation frequency lower than the operation frequency of the other compressor.
| JP6748217 | Refrigeration cycle equipment |
| WO/2012/172611 | AIR CONDITIONER |
FUKUHARA KEIZO
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka