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AssigneeColtec Industries Inc.
InventorsJohn E. Smith, Dennis N. Koenig, Jr., William E. Ruhig, Jr.
Estimating the term…
A toric pump has a metal impeller housing formed with a flat end face into which an annular impeller receiving recess extends to a depth which exceeds the axial thickness of the impeller mounted in the recess by an amount only sufficient to provide a minimum operating clearance for the impeller sides when an impeller cover is mounted on the housing with a flat end face of the impeller cover in sealed face to face engagement with the flat end face of the housing. A bore in the impeller housing receives a cylindrical portion of the pump drive motor to accurately locate the rotary axis of the impeller with respect to the peripheral side surface of the stripper portion of the pump housing. All impeller-stripper portion clearances are established by machining of the die cast impeller housing and the formation of a flat surface on the impeller cover. A filter cover mounted upon the impeller cover cooperatively defines with the impeller cover an enclosed filter receiving chamber having an externally accessible inlet port opening into the chamber through the filter cover and a pump inlet passage opening from the filter chamber into a pump chamber recessed into the flat end face of the impeller cover. The impeller cover is formed with an externally accessible outlet port communicating with the pump chamber. A resilient block of filter media is enclosed in the filter chamber to filter air or other fluid flowing through the chamber from the inlet port to the pump inlet passage.
A toric pump comprising an impeller housing having a front end face lying in a first general plane and a cup shaped impeller receiving recess in said front end face having a bottom surface lying in a second general plane parallel to said first general plane, said recess having a central axis normal to said first and second general planes, an impeller received in said impeller receiving recess for rotation about said axis, said impeller having front and rear side surfaces lying in parallel general planes normal to said axis and disposed between and respectively closely adjacent to said first and second general planes, an impeller cover having a front face and a flat rear face disposed in sealed face to face engagement with said front end face of said housing around the periphery of said impeller receiving recess, means defining a pump chamber in said rear face of said impeller cover cooperable with said impeller and extending circumferentially of said axis from an inlet end to an outlet end circumferentially separated from said inlet end by a stripper portion of said rear face, said impeller cover having externally accessible outlet port means in fluid communication with said outlet end of said pump chamber, means defining a generally cup shaped filter receiving recess in said front face of said cover having an inlet passage opening from said filter receiving recess into said pump chamber at said inlet end, a filter cover mounted on said front face of said impeller cover in overlying relation to said filter receiving recess and sealingly engaged with said front face around the periphery of said filter receiving recess, means defining an externally accessible inlet port in said filter cover opening into said filter receiving recess at a location remote from said inlet end in said impeller cover, and filter means resiliently gripped between said filter cover and said impeller cover between said inlet port and said inlet passage.
Dependencies are inferred from the claim text.