CENTRIFUGAL FAN IMPELLER, FAN UNIT AND SYSTEM OF CENTRIFUGAL FAN Russian patent published in 2008 - IPC F04D29/28 

FIELD: mechanical engineering; fans and ventilators.

SUBSTANCE: invention relates to impeller of centrifugal fan with blades 2 tilted opposite to direction of rotation 8 (backwards tilted impeller) in which outer edge areas 14, 7 of front and rear disks 3, 1 project behind outer diameter DAs of blades. Diffusion space, thus set between rear and front disks 1, 3 and output diameter DAs of blades and outer diameter DN of blades, provides effective conversion of kinetic energy of fluid medium into pressure potential (transformation of kinetic energy into static pressure). Profile of cross section of diffusion space is made rectangular or trapezium widened radially outwards.

EFFECT: increased efficiency of centrifugal fan.

10 cl, 9 dwg