Impeller and centrifugal fan

Abstract

The impeller includes a main plate having an annular shape, a shroud spaced apart from the main plate in an axial direction and having an annular shape, and a plurality of blades disposed in series in a circumferential direction between the main plate and the shroud. The blades are formed integral with the shroud and include ribs protruding in the axial direction on end surfaces of the blades in the axial direction. The main plate includes grooves to be fitted with the ribs. The shroud includes a recessed part. One set of a rib and a groove of the ribs and the grooves can be fitted each other. The one set of the rib and the groove and combinations of the ribs and the grooves other than the one set of the rib and the groove cannot be fitted each other.

Dependencies are inferred from the claim text.