CENTRIFUGAL FAN IMPELLER Russian patent published in 1994 - IPC

FIELD: fans. SUBSTANCE: profile bent back blades 3 are mounted in a fan impeller between lifting and covering disks. Each blade has longitudinal projection 6 with a curvilinear working and convex end surfaces 7, 8, the projection is located on working surface 5 in the area of the outlet part. The projection forms with working surface 5 diverging clearance 4, which middle line 9 in the outlet cross section is parallel to back surface 10 of blade 3. EFFECT: improved structure. 2 dwg