DIAMETRICAL FAN Russian patent published in 2001 - IPC

FIELD: fan manufacture, namely, production of diametrical fans. SUBSTANCE: diametrical fan includes helical housing 1 with inlet window 2 and with pumping branch pipe 3 near window, impeller 4 with vanes bent towards. Pumping branch pipe 3 has wall 6 adjacent with window 2. Vanes 5 have thickness no more than 0.05 of impeller diameter; they have chord length equal to 0.12-0.16 of impeller diameter and they are arranged with spacing 0.9-1.2. Housing 1 has logarithmic curve with curvature angle equal to 74-76 degrees and maximum turning angle of said curve equal to (155-180) degrees. Edge of wall 6 (of branch pipe 3) adjacent with window 2 is inclined by (20-30) degrees relative to maximum radius of helix. Curvature center of helix of housing 1 is matched with rotation axis of impeller 4. Angle of mounting vanes 5 relative to outer circumference of impeller 4 is equal to 155-165 deg, relative to inner circumference, 80-90 deg. Gaps between impeller 4, edges of housing 1 and edges of adjacent with window wall 6 of pumping branch pipe 3 are equal to 0.02-0.05 of diameter of impeller. EFFECT: enhanced efficiency and increased generated pressure. 4 cl, 2 dwg