CENTRIFUGAL FAN Russian patent published in 2006 - IPC F04D29/28 

FIELD: mechanical engineering; fans and ventilators.

SUBSTANCE: invention relates to improved centrifugal fan. Proposed fan with single of double intake has enclosed type impeller formed by rotating bladed wheel 10 with at least one cover member 13. Blades 11 of fan impeller are flat, tilted backwards relative to direction of impeller rotation, and cover member 13 is provided with section 13A on truncated cone surface, first curvilinear section 13B on surface and second curvilinear section 13C on surface in direction of flow. Radius of curvature of first curvilinear section of surface is less than radius of curvature of second curvilinear section of surface.

EFFECT: increased efficiency of centrifugal fans owing to use of optimum combination of parameters, for instance, number, shape and arrangement of blades of fan impeller and form of cover member.

8 cl, 9 dwg