Hollow centrifugal impeller, evaporation heat exchanger and heat pump system

The invention belongs to the technical field of air source heat pumps, and particularly relates to a hollow centrifugal impeller, an evaporation heat exchanger and a heat pump system.The hollow centrifugal impeller comprises a hollow liquid distribution disc, a hollow steam collection disc and a flow guide assembly, the sides, away from the flow guide assembly, of the hollow liquid distribution disc and the hollow steam collection disc are connected with an input pipe fitting and an output pipe fitting correspondingly, and a liquid outlet communicated with the flow guide assembly is formed in the side, opposite to the hollow steam collection disc, of the hollow liquid distribution disc. The liquid outlet is provided with an adjusting unit capable of increasing the liquid outlet amount of the liquid outlet along with increase of the rotating speed of the hollow liquid distribution disc, wind power driving and refrigerant evaporation of the air source heat pump can be achieved at the same time, and the size of