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.

Issue Section:
Technical Briefs
Keywords:
design engineering, fasteners, pumps, rotors, three screw pump, edge blunting, elliptic arc, geometrical parameter, blow hole area
Topics:
Pumps, Rotors, Screws, Design, Flow (Dynamics)

References

1.
Litvin
,
F. L.
, and
Fuentes
,
A.
, 2004,
Gear Geometry and Applied Theory
,
Cambridge University Press
,
Cambridge
.
2.
Mimmi
,
G.
, and
Pennacchi
,
P.
, 1995, “
Design of Three-Screw Positive Displacement Rotary Pumps
,”
Proceedings of Contact Mechanics II—Computational Techniques
,
Ferrara, Italy
, July 11–13, pp.
401
–
411
.
3.
Mimmi
,
G.
, and
Pennacchi
,
P.
, 1997, “
Determination of Tool Profile for the Milling of Three-Screw Pump Rotors
,”
Meccanica
,
32
(
4
), pp.
363
–
376
.
Crossref
Search ADS
 
4.
Mimmi
,
G.
, and
Pennacchi
,
P.
, 1997, “
Deviations Induced by Tool Sharpening in the Profile of Three Screw Pump Rotors
,”
Meccanica
,
32
(
6
), pp.
567
–
576
.
Crossref
Search ADS
 
5.
Mimmi
,
G.
, and
Pennacchi
,
P.
, 1998, “
Dynamic Effects of Pressure Loads in Three Screw Pump Rotors
,”
ASME J. Mech. Des.
,
120
(
4
), pp.
589
–
592
.
Crossref
Search ADS
 
6.
Mimmi
,
G.
, and
Pennacchi
,
P.
, 1998, “
Computation of Pressure Loads in Three Screw Pump Rotors
,”
ASME J. Mech. Des.
,
120
(
4
), pp.
581
–
588
.
Crossref
Search ADS
 
7.
Li
,
F. T.
, 2010,
Screw Pump
,
China Machine
,
Beijing
.
8.
Zheng
,
M. S.
,
Sun
,
Q. Y.
, and
Wang
,
F.
, 2008, “
The Establishment of Parameter Equations About the Rotors’ Profile of Three Screw Pump and Calculating of Slide Ratio Between Conjugate Curves
,”
Mech. Eng.
,
2008
(
5
), pp.
16
–
20
.
9.
Su
,
S. H.
,
Tseng
,
and C. H.
, 2000, “
Synthesis and Optimization for Rotor Profiles in Twin Rotor Screw Compressors
,”
ASME J. Mech. Des.
,
122
(
4
), pp.
543
–
552
.
Crossref
Search ADS
 
10.
Wu
,
Y. R.
, and
Fong
,
Z. H.
, 2008, “
Rotor Profile Design for the Twin-Screw Compressor Based on the Normal-Rack Generation Method
,”
ASME J. Mech. Des.
,
130
(
4
), p.
042601
.
Crossref
Search ADS
 
Copyright © 2011
 by American Society of Mechanical Engineers
You do not currently have access to this content.