CLEANING APPARATUS ENGINE FAN (VERSIONS) Russian patent published in 2000 - IPC

FIELD: cleaning equipment. SUBSTANCE: fan has blowing member with curved blades providing passage of air from dust catcher chamber via suction opening due to suction force created by rotating fan and discharge of delivered air outside from casing via outlet openings and suction opening. Fan has strengthening member positioned in central part of blowing member. Suction device shaft is rigidly fixed by nut in strengthening member. Blowing member has central cylindrical through opening with diameter of upper part exceeding that of lower part. Vertical channels of predetermined depth are running at equal angles relative to and along inner surface of through opening. Effective operation of engine is provided even when gap between fan blades and engine casing is not adjusted. Such construction allows fan to be prevented from deformation. EFFECT: increased efficiency, enhanced reliability in operation and simplified construction. 6 cl, 13 dwg