Radial fan impeller with adjustable blade tips

Abstract

The subject of the application is a centrifugal fan impeller with adjustable blade tips, adapted for economical regulation of flow parameters. The impeller is characterized in that the impeller cover (1) or the support disc (2) at a diameter D2' equal to 0.9 to 0.98 of the external diameter D2' is connected to the tip (3) of the blade (4) by means of a screw (5) screwed into the adjustment insert (6) and by a threaded connection with the housing (7) of the tip (3) and a locked screw (8) with a polygon-shaped end (9) of the adjustment insert (6).