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External Gear Pump Volumetric Efficiency: Numerical and Experimental Analysis
Technical Paper
2009-01-2844
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
External gear pumps and motors are robust and low cost positive displacement machines and are widely used in industrial and mobile applications. Nowadays however, optimal global efficiency represents a more crucial aspect to be considered when designing a hydraulic machine. For this reason, it becomes a primary necessity to investigate the phenomena which determine and affect the hydraulic machine total efficiency. In this work, the volumetric efficiency dependence on the operating speed and delivery pressure of external gear pumps is investigated by means of a mathematical model already presented in a previous paper and the results obtained are compared with experimental data.
First of all, the mathematical model is briefly presented; then the predicted results are discussed considering the influence of the pump operating conditions. Moreover, the influence on the volumetric efficiency of the behaviour of the hydraulically balanced bearing blocks, which are responsible of the pump axial balance, is exposed. In particular, it is shown that the tilted position of the bearing blocks and the height of the lateral clearances can greatly affect the volumetric efficiency.
The data coming from an experimental investigation carried out on commercial external gear pump units are then presented; both the volumetric and the mechanical efficiency have been measured.
The comparison between the experimental data and the numerical results allows discussing the bearing blocks balancing behaviour during pump operation.
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Citation
Borghi, M., Zardin, B., and Specchia, E., "External Gear Pump Volumetric Efficiency: Numerical and Experimental Analysis," SAE Technical Paper 2009-01-2844, 2009, https://doi.org/10.4271/2009-01-2844.Also In
References
- Mancò S. Nervegna N. “Simulation of an External Gear Pump and Experimental Verification” Proceedings of the JHPS International Symposium on Fluid Power Tokio - Japan March 1989 139 152
- Mancò S. Nervegna N. “Pressure Transients in an External Gear Hydraulic Pump” Proceedings of the JHPS International Symposium on Fluid Power. Tokio - Japan March 1993 221 227
- Gutés M. Gámez Montero Castilla P.J. Codina R. Macià E. 2000 “Journal Bearing Performance in Gear Pumps” Proceedings of the 1 st International FPNI Ph.D. Symposium on Fluid Power, Hamburg - Germany September 20-22 2000 259 269
- Edge K. Keogh P. Eaton M. “Modelling and Simulation of Pressures within the Meshing Teeth of Gear Pumps” International Conference on Recent Advances in Aerospace Actuation Systems and Components, Toulouse - France June 13-15 2001
- Paltrinieri F. Milani M. Borghi M. Zardin B. 2005 “Pressure Transients in External Gear Pumps and Motors Meshing Volumes” SAE Commercial Vehicle Engineering Congress and Exibition, Chicago, Illinois (USA) November 1 3 2005
- Borghi M. Milani M. Paltrinieri F. Zardin B. 2004 “About the Prediction of Pressure Variations in the Inter-Teeth Volumes of External Gear Pumps” 3 rd International PhD Symposium on Fluid Power Terrassa Spain th June nd July 2004
- Koç E. Kurbant A.O. Hooke C.J. “An analysis of the lubrication mechanisms of the bush-type bearings in high pressure pumps” Tribology International - Elsevier Sciences 30 8 553 560 1997
- Koç E. Hooke C.J. “An experimental investigation into the design and performance of hydrostatically loaded floating wear plates in gear pumps” Wear - Elsevier Sciences, N. 209 184 192 1997
- Koç E. Hooke C.J. “The Surface Non-Flatness Effect on the Design of Bush-Type Bearings in High Pressure Pumps and Motors” Wear - Elsevier Sciences 135 29 39 1989
- Paltrinieri F. Milani M. Borghi M. “Modelling and Simulating Hydraulically Balanced External Gear Pumps” Proceedings of the 2 nd International FPNI Ph.D. Symposium on Fluid Power, Modena, Italy July 3-6 2002
- Paltrinieri F. Milani M. Borghi M. Zardin B. 2005 “Studying the Axial Balance of External Gear Pumps” SAE Commercial Vehicle Engineering Congress and Exibition, Chicago, Illinois (USA) November 1 3 2005
- Paltrinieri F. Milani M. Borghi M. “Studying the Flow Field inside Lateral Clearances of External Gear Pumps” Proceedings of the 3 nd International FPNI Ph.D. Symposium on Fluid Power, Terrassa, Spain June th July nd 2004
- Wilson W.E. “Positive Displacement Pumps and Fluid Motors” Pitman Publishing Corporation 1950
- Zarotti G. L. Nervegna N. “Pump Efficiency Approximation and Modelling” 6th International Fluid Power Symposium, Paper C4 145 164 1981
- Paltrinieri F. Milani M. Borghi M. Zardin B. “External Gear Pumps and Motors Bearing Blocks Design: Influence on the Volumetric Efficiency” 51st National Conference on Fluid Power (NCFP), Las Vegas, Nevada, USA 2008
- Ivantysyn J. Ivantysynova M. “Hydrostatic Pumps and Motors” ABI Edition, ISBN-81-85522-16-2 2001
- Manring N.D. “Measuring Pump Efficiency:Uncertainty Considerations” Transaction of ASME, J. of Energy Resources Technology 127 280 284 December 2005