Evaporation fan for electric air conditioner

The utility model discloses an evaporation fan for an electric air conditioner, which comprises a motor, a fairing is arranged outside the motor, an impeller is mounted outside a driving shaft of the motor, supporting ribs are arranged at the inner end of the impeller, a mounting sleeve is connected to the surfaces of the supporting ribs, a spline groove is arranged in the mounting sleeve, a spline bulge is arranged outside the driving shaft, and the spline bulge is connected with the driving shaft. A spline protrusion of a driving shaft is sleeved with an installation sleeve of the impeller through a spline groove to be positioned, a protruding shaft is arranged outside the driving shaft, the installation sleeve is locked outside the protruding shaft through a threaded connection nut, and a volute is installed on the surface of the inner side of the outer end of a fairing in a sliding and clamping mode. The supporting force is large during rotation, the volute is locked and fixed through the single nut, asse