RADIAL TRANSMISSION COUNCIL WITH REGARD TO THREE-ACTIVE SCHOOLS

摘要

The invention relates to a centrifugal fan impeller ( 1 ) having an axis of rotation ( 6 ) and comprising one or more modules ( 2 ). Each module ( 2 ) comprises a mounting disc ( 4 ), at least one connecting ring ( 5 ) and a plurality of blades ( 3 ) extending between the mounting disc ( 4 ) and the connecting ring ( 5 ). The blades ( 3 ) are connected to the disc ( 4 ) and ring ( 5 ) at an angle (alpha) relative to the axis ( 6 ) of the impeller ( 1 ). The angle (alpha) at which the blades ( 3 ) are inclined may range from 5 to 30 degrees and the blades ( 3 ) may be rectangular or trapezoidal in shape depending on the type of performance required: improved capacity with rectangular blades or improved pressure head and acoustic properties with trapezoidal blades. Top performance is thus combined with acoustic comfort.