Abstract: The invention relates to dimensioning rules for a blade of an axial flow impeller. The dimensioning rules relate to: (i) the lengthwise dimension from the axis of rotation of the impeller to the tip of the blade; (ii) the widthwise dimension of the blade perpendicularly to the lengthwise direction; and (iii) respective angles for a plurality of folds of the blade. The invention also relates to an axial flow impeller having such blades.

Abstract: The invention relates to a blade (4) of an axial flow impeller (1). Dimensioning rules for the blade (4) are presented: A=0.2R; B=0.2Wb; C=0.2R; D=0.2Wb; E=0.5R; F=(0.1 . . . 0.2)R; G=0.2Wb; H=0.25R; I=0.1R; J=0.4R; K=0.1Wb. The first angle ?1=6°±1°, the second angle ?2=8°±1° and the third angle ?3=19° to 25°. R is the lengthwise dimension from the axis of rotation (x) of the impeller to the tip (7) of the blade (4). Width Wb is the widthwise dimension of the blade perpendicularly to the lengthwise direction. The invention also relates to an axial flow impeller (1) having said blades (4).