Patent ID: 7806669

Claim:
A pump for pumping fluid, comprising: a pump housing having a first end and a second end; a fluid inlet opening in the first end and a fluid outlet opening in the second end; a stationary conduit extending through the pump housing from the fluid inlet opening to the fluid outlet opening; an impeller that is separate from the stationary conduit and positioned to rotate about the stationary conduit externally of the stationary conduit and having a plurality of portions which are arranged to act on fluid at different positions about the stationary conduit; a motor coupled to the impeller and positioned externally of the stationary conduit, the motor including a rotor positioned to rotate about the stationary conduit; an inlet channel for introducing fluid from the stationary conduit to the fluid displacer to be pumped by the plurality of portions; and an outlet channel for directing pumped fluid from the impeller; wherein the stationary conduit is in fluid communication with the fluid inlet opening and the fluid outlet opening; and wherein the stationary conduit extends past the impeller.