并联轴向柱塞泵过渡区域脉动特性分析

并联轴向柱塞泵具有结构简单、能效高的特点,但柱塞泵内部结构配流盘排油单边腰型槽拥有双配流窗口,柱塞在经过配流窗口进行吸排油转换时,柱塞腔内闭死容积及通流面积的变化会产生较大的压力冲击和噪声,影响并联轴向柱塞泵的使用寿命和系统的稳定性.针对该问题,理论分析了柱塞泵运动学关系、配流盘配流面积等,利用多学科软件AMESIM建立了单柱塞模型,在此基础上构建整泵仿真模型.通过对单柱塞模型偏转角度和阻尼槽深度角进行分析,优化过渡区域几何关系,得到偏转角为7°,阻尼槽深为6°,该配流结构最为合理.进一步搭建试验台,对整泵的压力脉动进行试验验证,验证了模型的准确性,并得到随着负载压力的增大,输出压力脉动变大.

Analysis of pulse characteristics in transition region of parallel axial piston pump

Parallel axial piston pump has simple structure and high efficiency.Unilateral waist groove of valve plate in axial piston pump has double valve-window.Piston conducts oil inlet and outlet conversion through valve-window.The dead volume and flow area in piston chamber change to produce large pressure shock and noise, affecting service life of parallel axial piston pump and system stability.After analyzing kinematics relations of piston pump, valve plate area and deputy leakage of activity, single piston model was established by multidisciplinary software AMESIM.Based on this, the work establishes the whole pump simulation model.For single piston model, the geometry relation of transition region was optimized to obtain reasonable valve structure: the deflection angle in 7° and damping groove depth angle in 6°.After that, test platform was built to conduct experimental verification of whole pump pressure fluctuation.The accuracy of the model was proved, and with the increase of load pressure, the output pressure fluctuation became larger.