Bearing and filter arrangement for submersible pumps

Claim 1

In a submersible pump having a housing with inlet and discharge ends and a fluid flow passage between said ends, a rotary drive shaft in the housing having an upper end, and an impeller mounted on said shaft for rotation therewith to pump fluid through said passage from the inlet end to the discharge end, the improvement comprising: a hollow sleeve bearing supported on the housing and receiving the upper end of said shaft to assist in maintaining the alignment thereof, said shaft fitting loosely in said sleeve bearing to provide a clearance space communicating with said flow passage to permit fluid flow between said shaft and bearing for lubrication purposes; and a filter element mounted in said sleeve bearing above the upper end of said drive shaft, said filter element being formed of a porous substance restricting fluid flow through said clearance space while permitting fluid flow therethrough in sufficient quantity to lubricate the shaft and bearing, said filter element substantially preventing abrasive materials in the fluid such as sand and the like from passing downwardly through said filter element into said clearance space.