METHOD FOR REPAIRING IMPELLER OF EXHAUST FAN Russian patent published in 2000 - IPC

FIELD: high efficiency fans for hot and dusty gases, namely repairing flues of agglomeration type manufacturing processes at making exhaust fans, mainly welded-structure fans. SUBSTANCE: method comprises steps of dividing worn blades and discs, manufacturing, mounting and fastening new blades, balancing impeller. Worn blades are cut off from discs while remaining beads with height 5 mm-9 mm on surface of discs. New blades are mounted and welded on at shifting them along arc of disc circumference by central angle equal to 3-4 degrees relative to beads in direction opposite to rotation sign of impeller. If disc is subjected to cycle of 3-4 repairing steps, beads are removed from disc surface by working. Surface defects of discs are preliminarily welded on by means of electrodes identical to those used for welding on blades. EFFECT: lowered labor consumption and repairing cost, possibility of using welded impeller instead of riveted one. 5 cl