(57) A pump impeller has two impeller bodies (10, 10A, 20, 20A) attached to each other.
Each impeller body (10, 10A, 20, 20A) has an annular base wall (11, 11A, 21, 21A)
and multiple partition protrusions (12, 12A, 22, 22A) separately formed on an inner
surface of the base wall (11, 11A, 21, 21A). Multiple outlet channels (30, 30A) are
respectively defined between the partition protrusions (12, 12A, 22, 22A). Each outlet
channel (30, 30A) has a cross-sectional area decreasing from an inner end to an outer
open end of the outlet channel (30, 30A). Thus, liquid flowing through the outlet
channels (30, 30A) does not become turbulent and a working efficiency of a pump with
the pump impeller is certainly improved.
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