Research on Bearing Mechanism of Spherical Valve Pairs of Axial Piston Pumps

被引:1
|
作者
Xu, Shunhai [2 ]
Zhao, Chunxiao [1 ]
He, Dian [1 ]
Xu, Nan [3 ]
Zhang, Bin [1 ,3 ]
Gong, Guofang [1 ]
机构
[1] Zhejiang Univ, State Key Lab Fluid Power Transmiss & Control, Hangzhou 310001, Peoples R China
[2] China Railway Engn Equipment Grp Co Ltd, Zhengzhou 450016, Peoples R China
[3] Zhejiang Univ, Inst Adv Machines, Hangzhou 310001, Peoples R China
关键词
axial piston pump; valve plate design; theoretical study; numerical analysis; bearing characteristics;
D O I
10.3390/act13040147
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The hydraulic system drives the cutter head mechanism to realize the excavation of large tunnel boring equipment, which puts forward the technical requirements of high pressure and large flow to the pump source. The traditional small displacement axial piston pump uses a planar valve plate. However, under high flow and heavy load conditions, the planar valve plate configuration is prone to uneven wear due to the high-pressure and -velocity (PV) value and pressure shock, which ultimately affects the reliability of the system. A simulation analysis of the load-bearing characteristics of the spherical valve plate mechanism is conducted. The Computational Fluid Dynamics (CFD) method was used to construct flow field models for different valve plate oil film structures to calculate differences in their load-bearing capacities. Additionally, the reasons for variations in load-bearing characteristics based on the curvature radius of the spherical valve plate were analyzed. The simulation results demonstrate that the spherical valve plate exhibits superior leak and load-bearing performance compared to the traditional flat valve plate. Furthermore, the curvature radius of the spherical valve plate directly affects the pulsation characteristics of the piston pump. Smaller curvature radii increase the contact area of the oil film, resulting in greater fluctuation in oil film load-bearing, whereas larger curvature radii lead to increased oil film leakage. Using simulation calculations on heavy-load, high-displacement axial piston pumps, it is determined that the optimal curvature radius for stable load-bearing is 350 mm.
引用
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页数:16
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