| 摘要 |
The invention provides an impeller (52) wherein a protrusion (57) is provided on the inner surface and/or outer surface of blades (56). The protrusion (57) on a first blade (56) of a pair of blades (56) which are adjacent in the circumferential direction of a base part (54), and a second blade (56) of said pair are overlapping, when seen from the axial direction of the base part (54), and the protrusion (57) of the first blade (56) and the second blade (56) are not in contact. |
