Integral motor centrifugal pump

DETAILED DESCRIPTION The present art of electromotive centrifugal pumping has historically required a separation between the rotating centrifugal impeller inlet and the stationary volute supply inlet.
The resultant pressurized fluid effectively transits through the separation between the volute and the impeller suction inlet.
The separation allows a certain percentage of the pumped media to reenter the impeller suction supply inlet.
The resultant recirculation requires the application of additional electrical energy to repressurize the aforementioned recirculating media.
The resultant recirculation may also wear the surfaces of either the impeller inlet and/or the volute supply inlet.
This wearing process decreases the efficiency of the pump proportionally with the increased separation of the impeller inlet and the volute supply inlet.
In certain pumping situations, i.
e.
, sewage, pulp, trash pumping, etc.
, the recirculating media may carry suspended solids.
These solids complicate the pumping process when they become wedged between the rotating impeller inlet and the stationary volute.
The efficiency of the pump decreases when the wedged suspended solids causes impeller cavitation and/or friction.
The wedged suspended solids could effectively disable the pump or even stop the rotation of the impeller.
Damage may result to either the electromotor, the impeller or the volute intake.
Depending upon the impeller, volute or pump assembly the removal of these solids from the pump could be dangerous, labor intensive or expensive.
Furthermore, electromotive centrifugal pumping has encumbered design configurations of the drive motor to be an external appendage in relation to the impeller and volute.
Centrifugal pump impellers are usually driven by the electromotor shaft or pump bearing and alignment shaft intruding into the volute cavity.
The impeller is usually tapped and screwed to the shaft or bolted on the shaft in some fashion.
This and similar design configurations also encumber the assembly design to unnecessary parts and complexity