Characteristics of volumetric losses and efficiency of axial piston pump with respect to displacement conditions

Abstract

Abstract:A good efficiency performance of a pump over a wide range of displacement conditions is crucially important for variable pump control systems to save energy. However, according to the literature, less attention has been paid to the understanding of the efficiency, leakage flow, and compression flow characteristics of the pump with respect to displacement conditions. In this study, a test bench was built, and a novel explicit volumetric loss model was proposed to investigate these problems. The overall efficiency is found to drop considerably with the decreasing displacement. The volumetric losses range from 13% to 47% of the total power losses of pump at the rated speed, under the conditions of pressure ranging from 5 to 35 MPa and displacement ranging from 13% to 100% of full displacement. The highest proportion of compression flow losses in the total volumetric losses of pump at the rated speed can reach up to 41% when the pressure and displacement are greater than 30 MPa and 88% of full displacement, respectively; after that, the proportion gradually decreases with decreasing displacement. However, the leakage flow generally increases with decreasing displacement, or may decrease first and begin to increase after the minimum with the further decrease of displacement. In the components of leakage of slipper/swash plate pair, the squeeze leakage is found to reach a magnitude equal to that of the Poiseuille leakage. The findings can guide the further research and design of pumps with better efficiency performance.

Experimental Study on the Influence of the Rotating Cylinder Block and Pistons on Churning Losses in Axial Piston Pumps

“…The first group is volumetric losses caused by leakage flow losses, the losses in the second group are mechanical losses due to friction losses, and the third group is churning losses caused by the internal rotating components stirring the hydraulic fluid in axial piston pumps. Theoretical and experimental studies have been published on volumetric losses and mechanical losses in axial piston pumps [10][11][12][13][14][15].…”

“…The effect of different leakages through pump clearances was investigated, and the main source of the leakage in piston pumps was demonstrated by means of the algebraic leakage equations in their simulation model. Xu et al [15] explored the variation characteristics of volumetric losses of axial piston pumps over a wide operating range theoretically and experimentally, in particular for the displacement conditions. The proposed novel volumetric losses model can give a clear insight into the components of leakage.…”

Power loss characteristics analysis of slipper pair in axial piston pump considering thermoelastohydrodynamic deformation

“…Due to high efficiency and large power density, the axial piston pump is an important hydraulic component in a hydraulic fluid power system. It is crucially important to minimize the power losses for the axial piston pump over a wide range of displacement conditions to maintain this high‐efficiency performance . Specifically, the slipper pair is an important source of power loss that influences the efficiency of the pump.…”

“…It is crucially important to minimize the power losses for the axial piston pump over a wide range of displacement conditions to maintain this high-efficiency performance. 1 Specifically, the slipper pair is an important source of power loss that influences the efficiency of the pump. The power loss characteristics of the slipper pair strongly depend on the lubricating interface, which reduces the potential metal contact between the slipper and the swash plate.…”

Study on a New Design of Grouting Pump for Managing Water Inrush in Karst Tunnels

“…The collected data were analysed and processed. Finally, the test flow rate, pressure, efficiency and other performance parameters were calculated [18][19][20].…”