Design and Volumetric Efficiency of Micro High-pressure Two-dimensional Piston Pump

doi:10.3969/j.issn.1000-1093.2022.02.020

Abstract

Abstract: A micro hydraulic piston pump based on two-dimensional micro-pump structure was developed to meet the stringent requirements on space and weight of hydraulic equipment. The piston of this pump has two degrees of freedom of movement: rotation and linear movement. With the cooperation of guide rail and roller, the rotation of piston is converted into reciprocating motion, thereby completing the function of sucking and discharging oil. The pressure characteristic equation is solved to obtain the numerical solution of discharge chamber pressure and then the flow rate loss and volumetric efficiency of each part, and find the trapped oil and backflow phenomena. By analyzing the flow rate curve, it is found that the flow rate loss is mainly attributed to backflow flow rate loss and gap leakage. The backflow flow rate is proportional to the rotation speed, accounting for about 50%-78% of the total loss. A test bench was set up to test the volumetric efficiency. The experimental result show that the volumetric efficiency increases from 82.7% to 85.8% when the rotation speed increases from 2 000 r/min to 7 000 r/min at 30 MPa, and the maximum difference between the experimental value and the simulated value is about 6%.

Key words: pistonpump, fluidpowertransmissionandcontrol, micropump, volumetricefficiency, leakage, backflow

CLC Number:

TH137.51

CHEN Yong, LI Sheng, RUAN Jian, WU Changsheng, ZHANG Hao. Design and Volumetric Efficiency of Micro High-pressure Two-dimensional Piston Pump[J]. Acta Armamentarii, 2022, 43(2): 423-433.

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