Pressure impact characteristic of vane type continuous rotary motor under different buffer structures

Abstract

In order to solve the problem of pressure shock on the continuous rotary electro-hydraulic servo motor, the mathematical models of pressure gradient under the structure of pre-compressed chamber and U-shaped groove were established. The optimal structure dimensions of the pre-compressed chamber and the U-shaped groove were determined. The fluid models were established by Solidworks under the four structures of triangular groove, triangular groove with pre-compression chamber, U-shaped groove and U-shaped groove with pre-compression chamber. Simulation analysis of depressurization process of fluid models was performed based on FLUENT. The pressure nephograms of different buffer structures were compared and analyzed, and the pressure change curves and pressure gradient change curves in the process of depressurization were obtained. The results show that the optimal edge length of the pre-compressed chamber of continuous rotary electro-hydraulic servo motor is 20 mm in the process of decompression. The pressure reduction effect is the best when the width of the U-shaped groove is 1.5 mm and the depth is 1.65 mm. The U-shaped groove structure with pre-compression chamber is more conducive to alleviate the pressure shock phenomenon of the motor compared with different combine buffer structures.

摘要

为了解决连续回转电液伺服马达压力冲击问题, 分别建立预压缩容腔和 U 型槽结构下的压力梯度数学模型, 确定了预压缩容腔及 U 型槽的最优结构尺寸; 然后, 应用 Solidworks 软件分别建立有无预压缩容腔的三角槽和有无预压缩容腔的 U 型槽这四种结构下的流体模型; 基于 FLUENT 软件对流体模型的降压过程进行仿真分析, 对比分析不同缓冲结构下的压力云图, 得到降压过程的压力变化曲线和压力梯度变化曲线. 结果表明, 连续回转电液伺服马达在降压过程中预压缩容腔的最优边长为 20 mm; U 型槽宽度为 1.5 mm, 深度为 1.65 mm 时降压效果最好; 相较于不同组合缓冲结构, 有预压缩容腔的 U 型槽结构更有利于缓解马达的压力冲击现象.