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

FIELD: fan engineering. SUBSTANCE: working wheel has load-carrying and covering disks. Blades that are bent to the back are interposed between the disks. Each outlet part of the blade is provided with the longitudinal projection having curved working surface. Additional projections are made on the load-carrying disk from the back side of the blade. Each of the projections is shifted with respect tot the end edge of the blade along the chord and perpendicular to it by a value of 0.007-0.02 of the outer diameter of the wheel. The end face of the longitudinal projection of the blade can be concave over a cylindrical surface the generatrix of which is in a contact with the working surface of the additional projection. EFFECT: improved design. 2 cl, 2 dwg