The ornamental design for mixing impeller, as shown and described.
FIG. 1 is a top perspective view of a mixing impeller showing an embodiment of our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a top perspective view of a mixing impeller showing another embodiment of our new design;
FIG. 8 is a bottom perspective view thereof;
FIG. 9 is a front view thereof;
FIG. 10 is a top view thereof; and,
FIG. 11 is a bottom view thereof.
The broken lines are for environmental purposes only and form no part of the claimed design.
The mixing impeller of the embodiment of FIGS. 1-6 is rotationally symmetrical at 120° intervals around a central vertical axis thereof.
The mixing impeller of the embodiment of FIGS. 7-11 is being rotationally symmetrical at 90° intervals around a central vertical axis thereof, such that the right side, left side and rear views are substantially identical to the front view of FIG. 9.