Solar energy, air energy and phase change energy storage coupled heat pump unit

The invention discloses a solar energy, air energy and phase change energy storage coupling type heat pump unit which comprises a heat supply pipeline, a circulating heating mechanism, an integrated evaporator, a compressor, a condenser and an expansion valve, wherein the integrated evaporator, the compressor, the condenser and the expansion valve are sequentially installed on the heat supply pipeline. The integrated evaporator comprises a heat preservation shell, a heat absorption glass plate, a lower collection box, an upper collection box and an energy storage heat collection pipe. The energy storage heat collection pipe comprises a heat collection sleeve, an inner heat transfer pipe, a water inlet ring pipe, an upper sealing piston, a lower sealing piston and a limiting piece. Air openings are formed in the two opposite side walls of the heat preservation shell. The circulating heating mechanism comprises a circulating return pipe, a circulating water supply pipe, a heating water tank and a circulating pu