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Flow characteristics of new swing pump based on mechanical iris mechanism

Published:2023-11-01 author:LI Qiang, MENG Limin, ZHOU Qi, et al. Browse: 488 Check PDF documents

Flow characteristics of new swing pump based on mechanical iris mechanism

LI Qiang1, MENG Limin1,2, ZHOU Qi1, CAO Xufeng1

(1.School of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China; 2.State Key Laboratory

of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China)

Abstract: At present, scholars at home and abroad mostly focus on the traditional swing pump, while the research on the structural design of the brand-new swing pump is relatively few.The new swing pump has complex structure and large flow pulsation. Therefore, based on the principle of variable aperture of iris mechanism, a new swing pump model with simple structure was proposed, and the kinematics analysis and internal flow field research of the new swing pump were carried out. Firstly, the working principle of the new swing pump was analyzed, the geometric model of the new swing pump was established, and the displacement, velocity and corresponding instantaneous flow equation of the iris mechanism were derived. Then, ICEM CFD software was used to mesh the new swing pump, and the fluid region of the new swing pump was numerically simulated by using the dynamic mesh technology of Fluent software and RNG k-ε turbulence model. Finally, the pressure distribution cloud diagram, velocity distribution cloud diagram and flow pulsation curve of the internal flow field of the new swing pump were obtained by numerical simulation. The correctness of the kinematics equation was verified by comparing the flow pulsation curve. The results show that the structural design of the new swing pump is effective, and the maximum instantaneous flow rate is 1387.2L/min, which meets the design requirements. At the same time, the pressure inside the new swing pump chamber is mainly concentrated in the aperture position surrounded by the iris mechanism, and the maximum pressure value is 0.45MPa. The maximum flow velocity inside the cavity is mainly concentrated at the oil outlet and the oil inlet, and the maximum flow velocity can reach 62m/s. The velocity curve and the flow pulsation curve have the same waveform. The new swing pump enriches the structure of the pump and provides a reference for the future research of this type of pump.

Key words: hydraulic volume pump; new swing pump: swing pump fluid region; dynamic mesh technology; numerical simulation; internal flow field analysis; flow pulsation curve

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