WORKING WHEEL OF CENTRIFUGAL FAN Russian patent published in 1995 - IPC

FIELD: fan engineering. SUBSTANCE: working wheel of a centrifugal fan has carrying and covering disks with blades being interposed between them. The blades are shaped and bent back. Each blade is provided with longitudinal projection having curved working and non-working surfaces and positioned on the working surface in the zone of the output part. The curved working surface of the longitudinal projection has curvature of 0.85-1.0, and its non-working surface has curvature of 0.9-1.2 with respect to the length of mentioned projection. The outlet edge of the projection is curved and has curvature which is equal to the outer diameter of the working wheel. The center of the radii is arranged at the line of the projection. EFFECT: improved design. 2 cl, 3 dwg