| 摘要 |
To make an impeller of a multiblade blower having a plurality of blades on whose blade tips are formed serrated shapes into one where there are few variations in the positional accuracy of the blades and where rotational strength is improved, and to reduce the number of manufacturing man-hours. An impeller (7) of a blower (4) is disposed with circular support plates (31, 41) that are made of a resin and rotate about an axis of rotation and a plurality of blades (32, 42) that are made of a resin. The blades (32, 42) are disposed on outer peripheral portions of the circular support plates (31, 41) so as to be parallel to an axis of rotation, and serrated shapes (53) are formed on the blades by cutting out blade tips at plural places. Additionally, a step (61) is formed in a blade face of each of the blades (32, 42) at a position a predetermined distance from the blade tip where the serrated shape (53) is formed. |
