Centrifugal pump casing with offset discharge

Patent metadata

Field	Value
Publication number	US-2016138607-A1
Application number	US-201514980289-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Apr 27, 2012
Publication date	May 19, 2016
Grant date	—

Abstract

A pump casing having a casing body is configured with a discharge formed in the casing body where a midline of the discharge is offset from a tangent line of the casing body and offset from a centerline of the casing body, such that the midline of the discharge is located along a point between the defined centerline and defined tangent line of the casing body.

First claim

1 - 4 . (canceled)

5 . A pump casing for a centrifugal pump, comprising:
a casing body having a circumferential portion defining the outer periphery of the casing body and a center defined relative to the circumferential portion; a discharge extending from the circumferential portion of the casing body, the discharge having a midline defining a fluid pathway for discharge of fluid from the casing body; and a cutwater having a leading edge; wherein, the casing body has a centerline that is determined when the casing body is in a vertical orientation with the discharge and the midline of the discharge oriented vertically, and when the centerline lies in a vertical plane, the centerline extending through the center of the casing body and being oriented parallel to a tangent line defined by the circumferential portion of the pump casing, and further wherein the midline of the discharge is positioned between the centerline and tangent line of the pump casing wherein the distance between the midline of the discharge and the centerline is from sixty percent to seventy percent of the distance between the centerline and the tangent line of the pump casing.

6 . The pump casing of claim 5 , wherein the distance between the midline of the discharge and the centerline is from sixty-two percent to sixty-eight percent of the distance between the centerline and the tangent line of the pump casing.

7 . The pump casing of claim 5 , wherein the leading edge of the cutwater is positioned at an angle to a horizontal axis line X positioned and extending through the center of the casing body when the midline of the discharge is in a vertical orientation, the angle being from five degrees to twenty degrees from the horizontal axis line X.

8 . The pump casing of claim 7 , wherein the angle is from about five degrees to about twenty-five degrees from the horizontal axis line X.

9 . A centrifugal pump, comprising:
a pump casing, comprising
a casing body having a circumferential portion defining the outer periphery of the casing body and a center defined relative to the circumferential portion;
a discharge extending from the circumferential portion of the casing body, the discharge having a midline defining a fluid pathway for discharge of fluid from the casing body; and
a cutwater having a leading edge;
wherein, the casing body has a centerline that is determined when the casing body is in a vertical orientation with the discharge and the midline of the discharge oriented vertically, and when the centerline lies in a vertical plane, the centerline extending through the center of the casing body and being oriented parallel to a tangent line, defined by the circumferential portion of the pump casing, and further wherein the midline of the discharge is positioned between the centerline and tangent line of the pump casing wherein the distance between the midline of the discharge and the centerline is from about sixty percent to about seventy percent of the distance between the centerline and the tangent line of the pump casing;
a drive shaft; and an impeller operatively connected to the drive shaft.

10 . The centrifugal pump of claim 9 , wherein the distance between the midline of the discharge and the centerline is from about sixty-two percent to about sixty-eight percent of the distance between the centerline and the tangent line of the pump casing.

11 . The centrifugal pump of claim 9 , wherein the leading edge of the cutwater is positioned at an angle to a horizontal axis line X positioned and extending through the center of the casing body when the midline of the discharge is in a vertical orientation, the angle being from five degrees to twenty degrees from the horizontal axis line X.

12 . The centrifugal pump of claim 11 , wherein the angle is from five degrees to fifteen degrees from the horizontal axis line X.

Assignees

• Weir Minerals Australia Ltd

Inventors

• Stirling Thomas E

Classifications

• F04D29/428 Primary

  Discharge tongues (F04D17/04 takes precedence) · CPC title

• F04D29/043

  Shafts · CPC title

• F04D1/00

  Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (adapted for pumping specific fluids F04D7/00; priming or boosting F04D9/00) · CPC title

• F04D29/40

  Casings; Connections of working fluid {(bleed or by-pass valves F04D15/0011, F04D27/0215)} · CPC title

• F04D29/28

  for centrifugal or helico-centrifugal pumps {for radial-flow or helico-centrifugal pumps} · CPC title