Patent ID: 9453667
Filing Date: 2016-09-27
CPC Classification: F24D,F24F,F25B,Y02B

Claim Text:
1. A heat pump air-conditioning system, comprising: a refrigerant circulation system, comprising a four-way valve, a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first expansion device, a second expansion device, a first three-way pipe and a second three-way pipe, the four-way valve comprising a first opening, a second opening, a third opening and a fourth opening, the first opening, the compressor, the first heat exchanger, the first expansion device and the second opening being sequentially connected in series, and the third opening, the second heat exchanger, the first three-way pipe, the second expansion device, the third heat exchanger, the second three-way pipe and the fourth opening being sequentially connected in series, wherein in the four-way valve, the first opening is directly connectable to the third opening or the fourth opening, the first opening is indirectly connected to the second opening, the second opening is directly connectable to the third opening or the fourth opening, the third opening is indirectly connected to the fourth opening, the second opening is directly connected to the fourth opening when the first opening is directly connected to the third opening, and the second opening is directly connected to the third opening when the first opening is directly connected to the fourth opening; a first bypass valve, connected in parallel with the first expansion device, wherein two opposite ends thereof are directly connected to the first heat exchanger and directly connected to the second opening respectively; a second bypass valve, connected to the first three-way pipe and the second three-way pipe, the second bypass valve connected in parallel with the second expansion device and the third heat exchanger; and a liquid supply system, connected to the first heat exchanger.