| 摘要 |
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.
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