A pump casing for a centrifugal pump, which comprises an inlet opening, a discharge outlet, and a transition surface extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface arranged for separating an in
A pump casing for a centrifugal pump, which comprises an inlet opening, a discharge outlet, and a transition surface extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface arranged for separating an in use exit flow of material in the discharge outlet from an in use recirculation flow of material in the main pumping chamber. The transition surface has a cutwater having a profiled section which comprises a protrusion which extends irregularly from an otherwise generally rounded arched or U-shaped transition surface and is configured such that, in use, the velocity and/or turbulence resulting from the in use flow of the material being pumped in the main pumping chamber is reduced.
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1. A pump casing for a centrifugal pump, the pump casing including a main pumping chamber having: an inlet opening arranged for the introduction of a flow of material into the main pumping chamber during use;a discharge outlet extending from the main pumping chamber and arranged for the exit of a fl
1. A pump casing for a centrifugal pump, the pump casing including a main pumping chamber having: an inlet opening arranged for the introduction of a flow of material into the main pumping chamber during use;a discharge outlet extending from the main pumping chamber and arranged for the exit of a flow of material from the main pumping chamber during use; anda transition surface extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface arranged for separating an in use exit flow of material in the discharge outlet from an in use recirculation flow of material in the main pumping chamber;wherein when viewed from a line through a central axis of the casing, said line being parallel to a tangential line at the discharge outlet, said transition surface has a cutwater with a profiled section which comprises a protrusion which extends irregularly from an otherwise generally rounded arched or U-shaped transition surface and is configured such that, in use, the velocity and/or turbulence resulting from the in use flow of the material being pumped in the main pumping chamber is reduced. 2. A pump casing according to claim 1, wherein the transition surface also includes at least one blend or transition region to provide a smooth taper between the cutwater and the inner peripheral surfaces of the main pumping chamber and the discharge outlet. 3. A pump casing according to claim 2, wherein the protrusion itself has generally rounded edges. 4. A pump casing according to claim 2, wherein the protrusion has a bump or dimple shape. 5. A pump casing according to claim 2, wherein the protrusion has a tongue-like shape. 6. A pump casing according to claim 2, wherein the protrusion extends into the discharge outlet. 7. A pump casing according to claim 2, wherein the main pumping chamber comprises two opposing side wall portions and the protrusion is disposed generally centrally between the side wall portions. 8. A pump casing according to claim 2, wherein the protrusion is of an elastomeric or metallic material. 9. A pump casing according to claim 1, wherein the pump casing is in the form of a liner for a pump having an outer housing. 10. A pump casing according to claim 1 further comprising two side parts which can be fitted together so as to form the pump casing wherein each of said side parts comprises a part of the main pumping chamber, the discharge outlet and the cutwater and wherein each part of said cutwater has reinforcement associated therewith. 11. A pump casing according to claim 10 wherein said reinforcement includes a projection on one of the parts of the cutwater and a co-operating recess on the other of the parts of the cutwater, the projection being receivable within the recess when the side parts are fitted together. 12. A pump casing according to claim 10 wherein said cutwater includes a leading edge, said reinforcement being spaced from the leading edge of the cutwater. 13. A pump casing according to claim 11 wherein the projection extends into the recess when fitted sufficiently to account for any wear of the casing when in use. 14. A pump casing according to claim 11 wherein the reinforcement is spaced from the inner peripheral surface of the pumping chamber and is also spaced from the inner peripheral surface of the discharge outlet. 15. A pump casing according to claim 11 wherein said recess and said projection are generally rectangular when viewed in cross-section having a longitudinal axis extending in the direction of the cutwater. 16. A pump casing according to claim 10 wherein said reinforcement includes a recess in the cutwater of each of said two side parts and an insert having opposed end portions is receivable within the respective recesses. 17. A pump casing according to claim 1, wherein the pump casing is in the form of a liner for a pump having an outer housing. 18. A centrifugal pump having a pump casing with a main chamber therein, an inlet opening and a discharge outlet, and an impeller disposed within the main chamber and mounted for rotation on an impeller shaft, said pump casing further comprising a transition surface extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface being arranged for separating an in use exit flow of material in the discharge outlet from an in use recirculation flow of material in the main pumping chamber, and further wherein, when viewed from a line through a central axis of the pump casing, said line being parallel to a tangential line at the discharge outlet, said transition surface has a cutwater with a profiled section which comprises a protrusion that extends irregularly from an otherwise generally rounded arched or U-shaped transition surface and is configured such that, in use, the velocity and/or turbulence resulting from the in use flow of the material being pumped in the main pumping chamber is reduced. 19. The centrifugal pump according to claim 18 wherein the pump casing is in the form of a liner disposed within an outer casing.
Hyll John (8849 Summer Meadow Dr. Sandy UT 84092) Basmadjian Harold (11258 S. Brandon Park Dr. Sandy UT 84092), Flow-stabilizing volute pump and liner.
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