Electrical submersible motor

Abstract

A fluid system for a pump, which includes a downhole rotating shaft and bearings inside a housing, and where a fluid volume around shaft is circulated from outside housing through a filter, so that only clean non-abrasive fluid is permitted inside fluid volume pump to draw fluid around the shaft. A fluid expeller is included to expel fluid from the accumulated volume of fluid through the filter to purge the filter.

1 . A fluid system for a pump, which includes: a downhole rotating shaft and bearings inside a housing, a fluid volume around the shaft, a circulating fluid from outside the housing through a filter, such that only clean non-abrasive fluid is permitted inside fluid volume pump to draw fluid around the shaft. 
     
     
         2 . A fluid system according to  claim 1 , further including a fluid expeller to expel fluid from the accumulated volume of fluid through the filter to purge the filter. 
     
     
         3 . A fluid system according to  claim 1 , further including a fluid passage through a bearing or bearings. 
     
     
         4 . A fluid system according to  claim 1 , further including a protector hood to deflecting falling solids coming out of suspension. 
     
     
         5 . A fluid system according to  claim 1 , further including a bore through the shaft. 
     
     
         6 . A fluid system according to  claim 1 , further including a valve and inlet port a piston and a valve and outlet port to backflush the system. 
     
     
         7 . A fluid system according to  claim 6 , further including a cam on the shaft to drive the fluid through the inlet valve. 
     
     
         8 . A fluid system according to  claim 1 , wherein two such systems are included at each end of a rotor. 
     
     
         9 . A fluid system according to  claim 1 , wherein there is a continuous fluid flow through rotor