Multi-stage electric pump unit

Abstract

A multi-stage electric pump unit, of those that consist of a multi-stage centrifugal pump with an electric motor coupled directly to the pump, where each stage consists of a pump, an impeller and a diffuser, which each have channels with vaned and vaneless zones. These zones are delimited by a shroud-surface and a hub-surface, where the b angle is the angle of the tangent at each point, characterized because, given that the Y-axis of the electric pump is the radial co-ordinate and X is the axial co-ordinate, for flow rates, Q, between 2500 and 8000 liters/minute, the points of the impeller and diffuser surface comply with the sixth degree polynomial equation, Y=f(x)=Ax6+Bx5 +Cx4+Dx3+Ex2+Fx+G, and changing the constants of the equation for each part-zone of the diffuser and impeller. Applicable to hydraulic machines.

1 . A multi-stage electric pump unit, of those that consist of a multi-stage centrifugal pump with an electric motor coupled directly to the pump, where each stage consists of a pump, an impeller and a diffuser, which each have channels with vaned and vaneless zones. These zones are delimited by a shroud-surface and a hub-surface, where the β angle is the angle of the tangent at each point, characterised because, given that the Y-axis of the electric pump is the radial co-ordinate and X is the axial co-ordinate, for flow rates, Q, between 2500 and 8000 litres/minute, the points of the impeller and diffuser surface comply with the sixth degree polynomial equation, Y=f(x)=Ax 6 +Bx 5 +Cx 4 +Dx 3 +Ex 2 +Fx +G, where on the diffuser: 
 a) on the hub, the vaneless zone; A=B=C=D=E=0; F=0.6605; G=20.45;  
 b) on the shroud, the vaneless zone; A=B=C=D=E=0; F=0.7225; G=55.648  
 c) on the hub, the vaned zone; A=−9E-09; B= 7 E-06; C=−0.0019; D=0.3064; E=−26.923; F=1256.3; G=−24283  
 d) on the shroud, the vaned zone; A=1E-10; B=−9E-08; C=2E-05; D=−0.0033; E=0.2349; F=−7.616; G=174.28  
 e) on the hub, the vaneless zone; A=0; B=0; C=−1E-05; D=0.0073; E=−1.7542; F=186.27; G=−7311.6;  
 f) on the shroud, the vaneless zone; A=0; B=0; C=0; D=0.0053; E=−2.6745; F=446.37; −G=24717;  
 g) on the hub, β; A=0; B=0; C=1E-06; D=−0.0002; E=0.0203; F=−1.0819; G=156.82;  
 h) on the shroud, β; A=0; B=0; C=3E-07; D=−1E-04; E=0.0101; F=−0.7587; G=175:  
 
     
     
         2 . A multi-stage electric pump unit, in accordance with the preceding claim, characterised because on the impeller: 
 a1) on the hub, the vaneless zone; A=0; B=0; C=0; D= 6 E-05; E=0.0014; F=−0.0146; G=27.511;    b1) on the shroud, the vaneless zone; A=0; B=0; C=0; D=0; E=0; F=0; G=64.5;    c1) on the hub, the vaned zone; A=0; B=0; C= 5 E-06; D=−0.0014; E=0.1535; F=−6.3821; G=121.24;    d1) on the shroud, the vaned zone; A=−4E-08; B=8E-06; C=−0.0006; D=0.0247; E=−04771; F=4.3023; G=50.015;    e1) on the hub, β; A=0; B=3E-09; C=−9E-07; D= 0 . 0001 ; E=−0.0042; F=−0.0915; G=34.402;    f1) on the shroud, β; A=0; B=1E-09; C=−5E-07; D= 6 E−05; E=−0.0044; F=0.1822; G=22.2.    
     
     
         3 . A multi-stage electric pump unit, in accordance with the first claim, characterised because on the impeller: 
 a2) on the hub, the vaneless zone; A=0; B=0; C=0; D= 5 E-05; E=0.0013; F=−0.0139; G=27.511    b2) on the shroud, the vaneless zone; A=0; B=0; C=0; D=0; E=0; F=0; G=64.5    c2) on the hub, the vaned zone; A=0; B=0; C=5E-06; D=−0.0012; E=0.1205; F=−4.7599; G=93.614    d2) on the shroud, the vaned zone; A=0; B=7E−07; C=−0.0001; D=0.0058; E=−0.113; F=0.8709; G=62.273    e2) on the hub, β; A=0; B=0; C=9E-08; D=−3E-05; E=0.0002; F=0.0246; G=41.062    f2) on the shroud, β; A=0; B=0; C=−6E-07; D=0.0001;E=−0.0126; F=0.5887; G=23.694.