Study on Multi-flow Field Characteristics of Unloading Groove Spacing of Bidirectional Gear Pump

Document Type : Regular Article

Authors

School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning Province, 116024, China

Abstract

Improving the output flow quality of the high-precision micro bidirectional gear pump can effectively improve the position control accuracy and dynamic characteristics of the electro-hydraulic actuator. In order to meet the appeal requirements and reduce the vibration and noise of the gear pump and prolong its working life, this paper starts with the research of the key part of the gear pump–the unloading groove structure. The three characteristics of trapped oil phenomenon, cavitation phenomenon, and flow were used as key indices to evaluate gear pump performance. Using numerical simulation analysis, the dynamic grid simulation method was used to explore the influence of unloading groove spacing on the transient multi-flow field characteristics of the gear pump under conventional design range. Our results show that reducing the distance between unloading grooves can greatly reduce the trapped oil pressure and the amount of gas precipitation in the flow field, while reducing flow pulsation and improving volumetric efficiency. However, when the unloading groove spacing is too small, the instantaneous flow curve loses the pulsation characteristics and the flow stability decreases. Considering the influence of the gear pump on the accuracy of the electro-hydraulic actuator and the performance of the gear pump itself, the analytic hierarchy process was used to obtain the 1 mm unloading slot spacing, which best meets the engineering requirements of high flow accuracy and low vibration noise. The results provide a basis for work on the structural optimization of high-precision micro gear pumps.

Keywords

References

Abdellah El-Hadj, A. and Abd S. Z. B. Rahim (2020). Optimization of an External Gear Pump using Response Surface Method. Journal of Mechanics 36(4), 567-575.##
Antoniak, P. and J. Stryczek (2018). Visualization study of the flow processes and phenomena in the external gear pump. Archives of Civil and Mechanical Engineering 18(4).##
Bie de, V. G., M. A. Hulsen and P. D. Anderson (2021). Finite element modeling of a viscous fluid flowing through an external gear pump. Macromolecular Theory and Simulations 30(1), 2000060.##
Bilalov, Р. А. and О. Y. Smetannikov (2020). Numerical investigation of fluid dynamics phenomena in external gear pump. Computational Continuum Mechanics 13(4), 471-480.##
Chen, P. Y. (2021). Complementarity of indicators in multi-index comprehensive evaluation method. Statistics and Decision-Making 37(22), 22-26.##
Corvaglia, A., A. Ferrari, M. Rundo and O. Vento (2021). Three-dimensional model of an external gear pump with an experimental evaluation of the flow ripple. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 235(6), 1097-1105.##
Gao, J. H, Y. S. Wang, L. H. Zhao, H. Guo and J. G. Li (2015). Unloading groove optimization and the inner flow-field simulation analysis of the variable displacement external gear pump. Journal of Mechanical Transmission 39(5), 133-137.##
Guo, R., Y. Li, Y. Shi, H. Li, J. Zhao and D. Gao (2020). Research on identification method of wear degradation of external gear pump based on flow field analysis. Sensors 20(14), 4058.##
Li, Y. L. and F. C. Sun (2012). Quantitative analysis of the relationship between gear pump tooth side clearance and unloading slot spacing. Journal of Agricultural Engineering 28(22), 63-68.##
Li, Y. L. and F. C. Sun (2019). Study on H-type side clearance structure of gear pair trapped oil unloading for pump. Journal of Engineering Design 26(01), 15-19.##
Liu, H. M. Pan, J. Fu, H. Li and R. Cao (2022). A new type unloading groove design and simulation for engine fuel gear pump. In 2022 13th International Conference on Mechanical and Aerospace Engineering (ICMAE).##
Liu, Y. (2016). CFD-Based Three-Dimensional Numerical Calculation Method of High-Pressure Internal Gear Pump and Its Unbalanced Radial Force. Ph. D. thesis, Zhejiang University, Zhejiang, China.##
Liu, Z. L., Y. F. Hu, L. Cui, W. F. Zhu and J. Li (2020). Design of gear pump unloading groove and simulation of its internal flow field characteristics. Hydraulic and Pneumatic 09, 100-107.##
Marinaro, G., E. Frosina and A. Senatore (2021). A numerical analysis of an innovative flow ripple reduction method for external gear pumps. Energies 14(2), 471.##
Ransegnola, T., X. Zhao and A. Vacca (2019). A comparison of helical and spur external gear machines for fluid power applications: Design and optimization, Mechanism and Machine Theory 142.##
Rituraj, R. and V. Andrea (2021). Investigation of flow through curved constrictions for leakage flow modelling in hydraulic gear pumps. Mechanical Systems and Signal Processing 153.##
Romanenko, I., Y. Martseniuk and O. Bilohub (2022). Modeling the meshing procedure of the external gear fuel pump using a CFD tool. Computation 10(7), 114.##
Sanchugov, V. and P. Rekadze (2022). New method to determine the dynamic fluid flow rate at the gear pump outlet. Energies 15(9), 3451.##
Sedri, F. and A. Riasi (2019). Investigation of leakage within an external gear pump with new decompression slots: numerical and experimental study. Journal of the Brazilian Society of Mechanical Sciences and Engineering 41(5).##
Wei, L. J., T. Li, L. F. Lu, Y. Qiang and X. M. Luo (2021). Research on the influence of trapezoidal unloading groove on trapped oil pressure and flow pulsation of external gear pump. Hydraulic and Pneumatic 45(03), 62-69.##
Yang, G. L., W. Y. Wang, J. H. Bai, J. Jin, M. M. Zhang and F. T. Huang (2020). Cavitation characteristics of external gear pump under different unloading grooves. Manufacturing Technology and Machine Tools 09, 106-111.##
Zaheer, Q. and J. Masud, (2018). Comparison of flow field simulation of liquid ejector pump using standard k-ε and embedded les turbulence modelling techniques. Journal of Applied Fluid Mechanics 11(2), 385-395.##
Zhang, Y. X. and J. Jin (2015). Instantaneous flow and flow pulsation suppression of gear pump. Hydraulic and Pneumatic 03, 46-49.##
Zhao, X. and A. Vacca (2019). Theoretical investigation into the ripple source of external gear pumps. Energies 12(3), 535.##
Zhou, J., S. Yuan and C. Jing (2020). Research on flow characteristics of gear pump considering cavitation effect. Army Journal 41(1), 189-195.##

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History

  • Received: 02 October 2022
  • Revised: 16 January 2023
  • Accepted: 19 January 2023
  • Available online: 01 May 2023

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