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An investigation of the impact of pump deformations on circumferential gap height as a factor influencing volumetric efficiency of external gear pumps

    Rafał Cieślicki Affiliation
    ; Mykola Karpenko Affiliation

Abstract

Gear pumps are widely used in transport machines not only in hydraulic drive systems, but also in lubrication and fuel systems. A positive displacement pump converts mechanical energy into pressure energy stored in the liquid, which it transports to the hydraulic cylinder or motor. The efficiency of this process depends on the efficiency of the system components, including the efficiency of the pump, which depends on the amount of internal leakage through the gaps between the high and low pressure sides. The larger the gaps, the lower the volumetric efficiency. This article presents an investigations of impact of pump deformations on circumferential gap height. The article presents a three-dimensional model of an external gear pump using Finite Element Method (FEM) during operating conditions. The model reflects pumping operation at discharge pressures up to 32 MPa and it was validated against strain measurements of pump casing. The simulation results indicate that the pump casing becomes deformed due to pressure, causing a significant increase in the height of the circumferential gap. The increase of the discharge pressure from 8 to 32 MPa causes more than twofold local increase in the height of the circumferential gap. The obtained results indicate that for the correct modelling of the flow generated by gear pumps, it is necessary to consider the change in the size of the gaps resulting from the deformation of the pump.

Keyword : circumferential gap, finite element method, gear pump, leakage, pump deformation, simulation, volumetric efficiency

How to Cite
Cieślicki, R., & Karpenko, M. (2022). An investigation of the impact of pump deformations on circumferential gap height as a factor influencing volumetric efficiency of external gear pumps. Transport, 37(6), 373–382. https://doi.org/10.3846/transport.2022.18331
Published in Issue
Dec 22, 2022
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This work is licensed under a Creative Commons Attribution 4.0 International License.

References

Antoniak, P.; Stosiak, M.; Towarnicki, K. 2019. Preliminary testing of the gear pump with internal gearing with modification of the sickle insert, in Proceedings of the 25th International Conference “Engineering Mechanics 2019”, 13–16 May 2019, Svratka, Czech Republic, 25: 33–36. https://doi.org/10.21495/71-0-33

Bijak-Żochowski, M.; Dietrich, M.; Kacperski, T.; Stupnicki, J.; Szala, J.; Witkowski, J. 2017. Podstawy konstrukcji maszyn. Tom 2. Wydawnictwa Naukowo-Techniczne, Warszawa 1999. (in Polish).

Borghi, M.; Zardin, B.; Specchia, E. 2009. External gear pump volumetric efficiency: numerical and experimental analysis, SAE Technical Paper 2009-01-2844. https://doi.org/10.4271/2009-01-2844

Cieślicki, R.; Karliński, J.; Osiński, P. 2018. Numerical analysis of stress in a positive displacement external gear pump loaded by the tension of the bolts, in Proceedings of the 24th International Conference “Engineering Mechanics 2018”, 14–17 May 2018, Svratka, Czech Republic, 24: 165–168. https://doi.org/10.21495/91-8-165

Cieślicki, R.; Karliński, J.; Osiński, P. 2019. Numerical model of an external gear pump and its validation, in E. Rusiński, D. Pietrusiak (Eds.). CAE 2018: Proceedings of the 14th International Scientific Conference: Computer Aided Engineering, 20–23 June 2018, Wroclaw, Poland, 96–103. https://doi.org/10.1007/978-3-030-04975-1_12

Ghazanfarian, J.; Ghanbari, D. 2015. Computational fluid dynamics investigation of turbulent flow inside a rotary double external gear pump, Journal of Fluids Engineering 137(2): 021101. https://doi.org/10.1115/1.4028186

Ghionea, I. G.; Tarba, C. I.; Tiriplica, P. 2012. Simulation of the working conditions for a gear pump using finite element analysis method, Scientific Bulletin Series C: Fascicle Mechanics, Tribology, Machine Manufacturing Technology 26: 21–27.

Guo, R.; Li, Y.; Shi, Y.; Li, H.; Zhao, J.; Gao, D. 2020. Research on identification method of wear degradation of external gear pump based on flow field analysis, Sensors 20(14): 4058. https://doi.org/10.3390/s20144058

Karpenko, M.; Bogdevičius, M. 2017. Review of energy-saving technologies in modern hydraulic drives, Mokslas – Lietuvos ateitis / Science – Future of Lithuania 9(5): 553–558. https://doi.org/10.3846/mla.2017.1074

Karpenko, M.; Prentkovskis, O.; Šukevičius, Š. 2022. Research on high-pressure hose with repairing fitting and influence on energy parameter of the hydraulic drive, Eksploatacja i Niezawodność – Maintenance and Reliability 24(1): 25–32. https://doi.org/10.17531/ein.2022.1.4

Kollek, W.; Osiński, P.; Stosiak, M.; Wilczyński, A.; Cichoń, P. 2014. Problems relating to high-pressure gear micropumps, Archives of Civil and Mechanical Engineering 14(1): 88–95. https://doi.org/10.1016/j.acme.2013.03.005

Kollek, W.; Osiński, P.; Warzyńska, U. 2017. The influence of gear micropump body asymmetry on stress distribution, Polish Maritime Research 24(1): 60–65. https://doi.org/10.1515/pomr-2017-0007

Lisowski, E.; Filo, G.; Rajda, J. 2021. Analysis of the energy efficiency improvement in a load-sensing hydraulic system built on the ISO plate, Energies 14(20): 6735. https://doi.org/10.3390/en14206735

Osiński, P.; Warzyńska, U. 2022. FEM strength analysis of circumferential compensation with integrated lips in gear pumps, Energies 15(7): 2691. https://doi.org/10.3390/en15072691

Patrosz, P. 2021. Influence of gaps’ geometry change on leakage flow in axial piston pumps, in J. Stryczek, U. Warzyńska (Eds.). NSHP 2020: Advances in Hydraulic and Pneumatic Drives and Control 2020, 21–23 October 2020, Trzebieszowice, Poland, 76–89. https://doi.org/10.1007/978-3-030-59509-8_7

Rituraj; Ransegnola, T.; Vacca, A. 2018. An investigation on the leakage flow and instantaneous tooth space pressure in external gear machines, in 2018 Global Fluid Power Society PhD Symposium (GFPS), 18–20 July 2018, Samara, Russia, 1–8. https://doi.org/10.1109/GFPS.2018.8472358

Schiffer, J.; Benigni, H.; Jaberg, H. 2013. Development of a novel miniature high-pressure fuel pump with a low specific speed, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 227(7): 997–1006. https://doi.org/10.1177/0954407013476820

Śliwiński, P. 2018. The influence of water and mineral oil on mechanical losses in the displacement pump for offshore and marine applications, Polish Maritime Research 25(s1): 178–188. https://doi.org/10.2478/pomr-2018-0040

Sliwinski, P. 2019. The methodology of design of axial clearances compensation unit in hydraulic satellite displacement machine and their experimental verification, Archives of Civil and Mechanical Engineering 19(4): 1163–1182. https://doi.org/10.1016/j.acme.2019.04.003

Szwemin, P.; Fiebig, W. 2021. The influence of radial and axial gaps on volumetric efficiency of external gear pumps, Energies 14(15): 4468. https://doi.org/10.3390/en14154468

Vacca, A.; Guidetti, M. 2011. Modelling and experimental validation of external spur gear machines for fluid power applications, Simulation Modelling Practice and Theory 19(9): 2007–2031. https://doi.org/10.1016/j.simpat.2011.05.009

Wahab, A. 2010. Analytical prediction technique for internal leakage in an external gear pump, in ASME Turbo Expo 2009: Power for Land, Sea, and Air, 8–12 June 2009, Orlando, FL, US, 5: 85–92. https://doi.org/10.1115/GT2009-59287

Zardin, B.; Natali, E.; Borghi, M. 2019. Evaluation of the hydro–mechanical efficiency of external gear pump, Energies 12(13): 2468. https://doi.org/10.3390/en12132468