Air supplementing and enthalpy increasing structure, compressor and air conditioning system

The utility model provides an air supplementing and enthalpy increasing structure, a compressor and an air conditioning system, relates to the technical field of compressors, and solves the technicalproblem that a fixed air supplementing opening structure easily generates air supplementing backflow. The air supplementing and enthalpy increasing structure is arranged on an end cover of a compressor and comprises an air supplementing and enthalpy increasing channel, an air supplementing port adjusting mechanism and a driving device, and the air supplementing port adjusting mechanism is in transmission connection with the driving device; the air supply port adjusting mechanism can move in the non-axial direction of the air supply enthalpy increasing channel under the action of the driving force of the driving device so as to change the circulation area of the air supply enthalpy increasing channel. The air supply port adjusting mechanism can move in the non-axial direction of the air supply enthalpy increasing c