Pumps

Claim 1

A CENTRIFUGAL PUMP COMPRISING A ROTATABLE IMPELLER WHEEL HAVING A ROTATABLE ROTOR AND VANES RADIALLY EXTENDING FROM THE ROTOR, A CASING FORMED AS A BODY OF REVOLUTION AND HAVING A SIDE FACING THE IMPELLER WHEEL, SAID SIDE BEING FORMED WITH AN ARCUATE CHANNEL CONCENTRIC TO THE AXIS OF THE ROTOR AND OPEN TO THE VANES, SAID VANES DEFINING POCKETS OPENING TO THE CHANNEL, SAID CHANNEL BEING FORMED SUBSTANTIALLY CONCAVE IN THE SIDE OF THE CASING AND BEING DEFINED BY A SUBSTANTIALLY CONCAVE SURFACE AND BEING SPACED AWAY FROM THE VANES IN A DIRECTION LONGITUDINALLY PARALLEL WITH THE AXIS OF ROTATION OF THE ROTOR, SAID CHANNEL HAVING CLOSED ENDS, ONE OF THE ENDS OF SAID CONCAVE SURFACE CHANNEL BEING IN COMMUNICATION WITH AN INTAKE SUCTION APERTURE FORMED IN THE CASING AND THE OTHER END OF SAID CONCAVE SURFACE CHANNEL BEING IN COMMUNICATION WITH AN OUTLET PRESSURE APERTURE FORMED IN THE CASING, SAID CONCAVE SURFACE CHANNEL HAVING A BOTTOM PORTION AND OPPOSING SIDE PORTIONS, AT LEAST ONE FLOW BAFFLE RIB POSITIONED IN THE CONCAVE SURFACE CHANNEL BETWEEN THE INTAKE AND OUTLET APERTURES, SAID RIB EXTENDING FROM THE BOTTOM PORTION OF THE CONCAVE SURFACE CHANNEL IN A DIRECTION TOWARD THE VANES OF THE IMPELLER WHEEL TO AN EXTENT AT LEAST OVER HALF BUT LESS THAN THREE QUARTERS OF THE DEPTH OF THE CONCAVE SURFACE CHANNEL AND HAVING A FREE LONGITUDINAL EDGE DISPOSED PARALLEL TO AND SPACED AWAY FROM THE VANES AND SAID RIB BEING SPACED FROM THE SIDE PORTIONS OF THE CONCAVE SURFACE CHANNEL SO THAT THE CONCAVE SURFACE CHANNEL HAS INNER AND OUTER FREE RADIAL ZONES ON OPPOSITE SIDES OF THE RIB.