LOW-PRESSURE CENTRIFUGAL FAN Russian patent published in 2004 - IPC

FIELD: mechanical engineering; centrifugal fans.

SUBSTANCE: invention relates to general-purpose centrifugal fans with one side suction and operating at low pressures, up to 1000 Pa and it can be used to transfer air at pressure losses in air ducts. According to invention, centrifugal pump has volute with inlet and outlet holes installed together with electric motor on bed frame on shaft of which impeller is secured by means of hub. Impeller consists of front and rear disk and blades placed disks at equal pitch square to plane of rear disk. Front disk is made in form of flat ring. Leading edges of blades are located on inner diameter of disk, and trailing edges, on outer diameter being square to its plane. Width of front disk is made to size of blade section. Blade is installed at angle of 45^o to axis passing through center of impeller. Height of blade L is 0.275 of impeller diameter, width of front disk, blade bending radii and its geometrical dimensions are calculated by standard formulas.

EFFECT: improved aerodynamic characteristics, simplified technology of manufacture.

6 dwg