The invention relates to the technical field of air conditioner heat pumps, in particular to an energy accumulating type efficient air-cooled
heat pump unit. The energy accumulating type efficient air-cooled
heat pump unit comprises a refrigerating compressor, a four-way
reversing valve, an outdoor side
heat exchanger, an outdoor side fan, a cold accumulator, a
phase change cold accumulating medium, an evaporating coiled
pipe for cold accumulation, a re-cooling coiled
pipe for cold accumulation, a heat accumulator, a
phase change heat accumulating medium, an evaporating coiled
pipe for heat accumulation, a re-cooling coiled pipe for heat accumulation, an indoor side
heat exchanger, an indoor side fan, a gas-liquid separator, an evaporating pressure regulating valve, an energy accumulation type expansion valve, a
drying filter, an observing mirror, a main path expansion valve, a first
solenoid valve, a second
solenoid valve, a third
solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a first
check valve, a second
check valve, a third
check valve, a fourth check valve and a connecting pipeline. Through the assisting regulation of the cold accumulator and the heat accumulator and the skillful switching combination of one four-way
reversing valve and four check valves, the problems of
heat supply and
refrigeration under extreme working conditions are solved, and the use temperature range of an air source
heat pump is increased.