WORKING WHEEL OF CENTRIFUGAL FAN Russian patent published in 1996 - IPC

FIELD: fan engineering. SUBSTANCE: working wheel of centrifugal pump has disks and profiled blades that are bent back and interposed between the disks. Each of the blades is provided with a longitudinal projection positioned at its outlet part from the back and having curved segment of the working surface that abuts against the back. The curvature of the segment is inverse to the back curvature. The projection has a strait segment at the periphery from the working side. The linear segment abuts against the curvature segment and its length is 0.6 of the projection length. The curvature of the nonworking surface of the projection is inverse to the curvature of the nonworking surface of the blade and equal to 0.9-1.2 of the projection length. EFFECT: improved design. 2 dwg