CPC F04D 13/10 (2013.01) [F04D 1/06 (2013.01); F04D 7/04 (2013.01); F04D 13/021 (2013.01); F04D 29/0413 (2013.01); F04D 29/708 (2013.01); F04D 29/086 (2013.01); F04D 29/2272 (2013.01)] | 14 Claims |
1. A mixed-flow impeller for an electric submersible pump, the mixed flow impeller comprising:
a lower end and an upper end;
a hub that comprises a through bore that defines an axis;
a lower shroud ring that extends to a shroud wall;
blades that extend at least in part radially outward from the hub to the shroud wall wherein each of the blades comprises a leading edge and a trailing edge;
a lower balance ring that comprises a radially inward facing chamber surface and a radially outward facing diffuser clearance surface; and
a lower guard ring disposed radially outwardly from the lower shroud ring and the lower balance ring, wherein the lower guard ring comprises an axially facing diffuser clearance surface that is disposed axially between the leading edges of the blades and the lower end.
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