Importance

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Abstract

A booster propeller is located at the inlet of a flared funnel leading toward arcuate inlet apertures in an end plate of a centrifugal pump casing. Such propeller has radially projecting blades of generally right triangular cross section with bases formed of the broad trailing sides and broad bottom sides remote from the impeller; the hypotenuse side of each blade being a broad upper surface inclined relative to a plane perpendicular to the axis for propelling slurry toward the inlet apertures. The end plate is recessed into the impeller-receiving bowl of the pump casing such that the inner face of the end plate is flush with the adjoining inner face of the peripheral pump outlet conduit integral with the pump casing. The impeller has a circular shroud plate perpendicular to the axis with vanes or blades projecting toward the end plate and having cupped leading surfaces forming a sharpened edge. Such blades are swept back in the area of the end plate inlet apertures for effective slicing of chunks or lumps of solid material in the slurry in combination with sharpened leading edges of the inlet apertures. The pump casing bowl has a semicylindrical wall portion closely encircling the impeller and providing a pressure-increasing zone for slurry accelerated outward before the bowl wall spirals volutely outward to the outlet conduit. Short ribs or vanes projecting from the shroud plate opposite the pumping blades maintain a slight suction in the area of the seal at the top of the casing.

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First Claim