Submersible electric pump having a shaft with spaced apart shoulders

摘要

A submersible electric pump includes a housing adapted to be submerged within a fluid to be pumped having apertures extending therethrough. An electric motor stator is positioned within the housing in communication with the apertures and is adapted to be in contact with the fluid. Inner and outer pump rotors are positioned within the housing in meshed engagement with one another to pump fluid when rotated. A plurality of permanent magnets are fixed for rotation with the outer rotor.

主权项

1. A submersible electric pump comprising:
a first shell having a planar first pump surface; a second shell fixed to the first shell defining a housing and having a planar second pump surface spaced apart from and extending parallel to the first pump surface; a gerotor pump having an inner rotor and an outer rotor, each rotor having opposite faces positioned adjacent the first and second pump surfaces; a rotor shaft including spaced apart shoulders engaging each of the first and second shells to define a predetermined spacing between the first and second pump surfaces; an electric motor stator positioned within the housing; and a plurality of permanent magnets fixed for rotation with the outer rotor, the magnets being positioned proximate the stator, wherein the outer rotor includes an outer cylindrical surface and one of the first and second shells includes an inner cylindrical surface, the outer cylindrical surface being supported for rotation by the inner cylindrical surface, the electric pump further including a back iron sleeve fixed to the plurality of permanent magnets, wherein the outer rotor includes another outer cylindrical surface having a diameter greater than a diameter of the inner cylindrical surface, the another outer cylindrical surface being fixed to the back iron sleeve.