Technical Briefs

Geometrical Design and Investigation of a New Profile of the Three Screw Pump

[+] Author and Article Information
Jian Xu, Quanke Feng

Weifeng Wu1

School of Energy and Power Engineering,  Xi’an Jiaotong University, No. 28 Xianning West Road, Xi’an 710049, P. R. C.weifengwu@mail.xjtu.edu.cn


Corresponding author.

J. Mech. Des 133(9), 094501 (Sep 07, 2011) (5 pages) doi:10.1115/1.4004588 History: Received March 08, 2011; Revised July 04, 2011; Published September 07, 2011; Online September 07, 2011

This paper presents a new edge blunting method of the three screw pump rotor with an elliptic arc and equations of the rotor profile after edge blunting. Through comparisons of different geometrical parameters of the pump, i.e., flow area, contact line length per lobe, blow hole area, etc., the new profile is proved to be better than the existing profiles of the three screw pump. The new streamlined profile, with a significantly smaller blow hole area, is of reference significance for the optimization design and further improvement of three screw pump.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 8

Flow area of the three screw pump

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Figure 9

Contact line per lobe: (a) contact line attached to the driven rotor, (b) contact line attached to the driving rotor, and (c) contact line projected to the xoy plane

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Figure 10

Blow hole: (a) blunting with an elliptic arc and (b) blunting with a circular arc

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Figure 7

Rotor profiles after edge blunting in the transverse section of the rotor and the locus of generation

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Figure 6

Parameters of the elliptic arc

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Figure 5

A new edge blunting method using an elliptic arc

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Figure 4

Theoretical profile of the driven rotor

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Figure 3

Applied coordinate systems

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Figure 2

Two typical methods of edge blunting: (a) edge blunted by a line and (b) edge blunted by a circle

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Figure 1

Illustration of the primary components of the three screw pump




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