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Calculation method of flow area of valve plate of axial piston pump based on 3D spatial point cloud model

Published:2024-05-24 author:GUO Zhimin, DAI Haishu, ZHAI Jiang, et al. Browse: 644 Check PDF documents

Calculation method of flow area of valve plate of axial piston pump based on

3D spatial point cloud model

GUO Zhimin1,2, DAI Haishu3,4, ZHAI Jiang1,2, WU Dongwei1,2, XU Nan3,4, XIE Haibo3,4

(1.Linde Hydraulic(China) Co., Ltd., Weifang 261205, China; 2.Weichai Power Co., Ltd., Weifang 261205, China;

3.Institute of Advanced Machines Zhejiang University, Hangzhou 310014, China;

4.State Key Laboratory of Fluid Power and Mechatronics, Zhejiang University, Hangzhou 310001, China)

Abstract: The axial piston pump can switch the high and low pressure circulation through the valve plate in the working process, and the flow area of the valve plate is an important parameter affecting the smooth transition of internal pressure of the axial piston pump. In order to complete the flow area of the distribution structure, a method of flow area calculation based on multi-dimensional flow field point cloud was proposed. Firstly, the point cloud process of the valve plate flow field was analyzed theoretically, and the implementation method of point cloud processing was obtained. Then, a series of modifications were made to the three-dimensional basin model of the valve plate, and a method was proposed to modify the connecting stage model of the buffer groove, which improved the accuracy of the calculation of the flow area. Finally, the flow area of different distribution stages was calculated and compared with the results obtained by theoretical measurement and numerical simulation of computational fluid dynamics (CFD). The calculation results show that the peak value of the flow area obtained by the identification algorithm based on multi-dimensional flow field point cloud is 174.5 mm2, while the theoretical measurement value is 177.5 mm2, and the relative error rate of the two is about 1.7%. The overall relative error rate of the results based on the CFD method is less than 5%. The results show that the method can solve and calculate the flow area of the valve plate directly and accurately, and effectively simplify the process of solving the flow area transformation trend.

Key words: axial piston pump; valve plate; point cloud model; flow area calculation; computational fluid dynamics (CFD); buffer groove

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