Pump impeller

A pump impeler having a hollow central hub for receiving a shaft, said hub having a hub bottom end portion, a plurality of circumferentially-spaced vanes extending in a direction outwardly of said hub bottom end portion, an annular shroud extending upwardly from said vanes in outwardly-spaced surrounding relationship to said hub to provide an annular liquid inlet passage between said hub and annular shroud leading to said vanes, and a permanent magnet motor rotor attached to said annular shroud on the opposite side thereof from said inlet passage above said vanes.

A pump impeller having a hollow central hub for receiving a shaft, said hub having a hub bottom end portion, a plurality of circumferentially-spaced vanes extending in a direction outwardly of said hub bottom end portion, an annular shroud extending upwardly from said vanes in outwardly-spaced surrounding relationship to said hub to provide an annular liquid inlet passage between said hub and annular shroud leading to said vanes, a permanent magnet rotor carried by said shroud, a motor stator surrounding said rotor, said stator being encapsulated in plastic material that defines a stator housing, said stator housing including a cylindrical sleeve extending upwardly from said impeller, said sleeve having a sleeve inner surface and said rotor having a rotor outer surface closely adjacent said sleeve inner surface, and said sleeve providing a liquid flow passage through which liquid is guided to said impeller inlet passage.

A sump pump including a volute having a volute outlet, an impeller rotatably mounted in said volute for discharging liquid through said volute outlet, said impeller including a central hub having a hub bottom shroud extending outwardly therefrom, a plurality of circumferentially-spaced vanes extending outwardly of said hub above said hub bottom shroud to provide a plurality of outwardly facing impeller outlets therebetween in said volute, said impeller having an integral annular shroud surrounding said hub in outwardly spaced relationship thereto above said vanes to provide an annular liquid inlet passage to said vanes between said hub and annular shroud, a permanent magnet rotor carried by said annular shroud, and a motor stator surrounding said magnet rotor.