Relating to centrifugal pump impellers

Patent metadata

Field	Value
Publication number	US-9422938-B2
Application number	US-201514683686-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	May 27, 2008
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A centrifugal pump impeller includes front and back shrouds and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face having a radius of curvature (R s ) in the range from 0.05 to 0.16 of the outer diameter of the impeller (D 2 ) The back shroud includes an inner main face and a nose having a curved profile with a nose apex in the region of the central axis which extends towards the front shroud, there being a curved transition region between the inner main face and the nose. F r is the radius of curvature of the transition region and the ratio F r /D 2 is from 0.32 to 0.65. Other ratios of various dimensions of the impeller are also described.

First claim

The invention claimed is:

1. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face has a profile defined by the following:
y n =−2.3890009903 x n 5 +19.4786939775 x n 4 −63.2754154980 x n 3 +102.6199259524 x n 2 −83.4315403428 x+ 27.7322233171

where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 , wherein x and y define the actual coordinates of an impeller front shroud arcuate inner face, and D 2 (which is the impeller outside diameter) is 550 mm, and B 2 (which is the impeller outlet width) is 72 mm.

2. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the back shroud further includes a nose having a curved profile with a nose apex in the region of the rotation axis which extends towards the front shroud wherein the curved profile is defined by the following:
y n =−87.6924201323x n 5 +119.7707929717x n 4 −62.3921978066x n 3 +16.0543468684x n 2 −2.7669594052x+0.5250083657 where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 , wherein x and y define the actual coordinates of an impeller back shroud further including a nose having a curved profile, and D 2 (which is the impeller outside diameter) is 550 mm, and B 2 (which is the impeller outlet width) is 72 mm.

3. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face has a profile defined by the following:
y n =−7.0660920862x n 5 +56.8379443295x n 4 −181.1145997000x n 3 +285.9370452104x n 2 −223.9802206897x+70.2463717260 where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 , wherein x and y define the actual coordinates of an impeller front shroud arcuate inner face, and D 2 (which is the impeller outside diameter) is 1560 mm, and B 2 (which is the impeller outlet width) is 190 mm.

4. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the back shroud further includes a nose having a curved profile with a nose apex in the region of the rotation which extends towards the front shroud wherein the curved profile is defined by the following:
y n =−52.6890959578x n 5 +79.4531495101x n 4 −45.7492175031x n 3 +13.0713205894x n 2 −2.5389732284x+0.5439201928 where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 , wherein x and y define the actual coordinates of an impeller back shroud further including a nose having a curved profile, and D 2 (which is the impeller outside diameter) is 1560 mm, and B 2 (which is the impeller outlet width) is 190 mm.

5. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face has a profile defined by the following:
y n =−0.8710521204x n 5 +7.8018806610x n 4 −27.9106218350x n 3 +50.0122747105x n 2 −45.1312740213x+16.9014790579 where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 , wherein x and y define the actual coordinates of an impeller front shroud arcuate inner face, and D 2 (which is the impeller outside diameter) is 712 mm, and B 2 (which is the impeller outlet width) is 82 mm.

6. An impeller for use in a centrifugal pump, the pump including a pump casing having a chamber therein, an inlet for delivering material to be pumped to the chamber and an outlet for discharging material from the chamber, the impeller being mounted for rotation within the chamber when in use about a rotation axis, the impeller including a front shroud and a back shroud, each having a main inner face in a plane substantially at right angles to the rotation axis and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, wherein the back shroud further includes a nose having a curved profile with a nose apex in the region of the rotation which extends towards the front shroud wherein the curved profile is defined by the following:
y n =−66.6742503139x n 5 +103.3169809752x n 4 −60.6233286019x n 3 +17.0989215719x n 2 −2.9560300900x+0.5424661895 where the y n axis is in the plane of the back shroud main inner face and the x n axis is coaxial with the rotation axis, and y n equals y/(0.5×D 2 ) and x n equals x/B 2 wherein x and y define the actual coordinates of an impeller back shroud further including a nose having a curved profile, and D 2 (which is the imp

Assignees

• Weir Minerals Australia Ltd
• Weir Minerals Australia Ltd

Inventors

• Burgess Kevin Edward
• Liu Wen-Jie
• Lavagna Luis Moscoso

Classifications

• F04D29/2288

  for comminuting, mixing or separating · CPC title

• Y10S416/02

  Formulas of curves · CPC title

• F04D29/242

  Geometry, shape · CPC title

• F04D7/04 Primary

  the fluids being viscous or non-homogenous · CPC title

• F04D29/22 Primary

  specially for centrifugal pumps · CPC title