IMPELLER FOR TURBO FAN

PROBLEM TO BE SOLVED: To enable the completion of correcting dynamic balance of an impeller without requiring an experienced operator and to improve reliability of a state of sticking to an additional member. SOLUTION: A multiblade impeller for a turbo fan of the invention has a dynamic balance correction means relating to sound of rotating operation. The dynamic balance correction means has a group of small openings or small holes perforated in an annular front face shroud connecting the impeller or an impeller holding substrate (back face shroud), and screw members screwed and fitted into the small openings (holes) as a weight for correcting the balance. Preferably, the small openings (holes) in which the weight for correcting the balance is screwed and fitted are circumferentially and equally distributed to be concentric with the center of rotation. COPYRIGHT: (C)2007,JPO&INPIT