流体脉宽调制双向变量机构流量特性研究  

Research on flow characteristics of fluid pulse width modulation bidirectional variable mechanism

作　　者：徐修文 任燕[1] 鲁立中 阮健[2] XU Xiuwen;REN Yan;LU Lizhong;RUAN Jian(College of Mechanical and Electrical Engineering,Wenzhou University,Wenzhou 325035,China;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]温州大学机电工程学院,浙江温州325035 [2]浙江工业大学机械工程学院,浙江杭州310023

出　　处：《工程设计学报》2024年第6期766-775,共10页Chinese Journal of Engineering Design

基　　金：国家自然科学基金资助项目(52175060)。

摘　　要：液压系统流量双向变化大多采用变转速驱动变量泵的方法,但变量机构的结构较复杂,且频繁双向变量调节会导致动态响应速度较慢。因此,提出了适用于定量泵流量调节的新机构,以实现双向变量功能。通过双向变量机构阀芯的轴向移动改变流体脉宽调制占空比,阀芯相对阀套的转速与阀芯上过流窗口数的乘积决定了流体脉宽调制的频率。对双向变量机构的流量特性进行了仿真和试验分析,结果表明:双向变量机构能够实现占空比为0~100%的双向流量控制,且仿真结果与试验结果之间仅有1.8%的误差。研究结果为固定转速设计的液压泵在变转速工况下的使用提供了一种新的流量控制方式。The method of variable-speed driving variable pump is mostly adopted for the bidirectional flow changes of hydraulic system.However,the structure of variable mechanism is relatively complicated,and frequent bidirectional variable regulation will lead to low dynamic response speed.Therefore,a new mechanism for flow regulation of fixed displacement pump was proposed to realize bidirectional variable function.The duty cycle of fluid pulse width modulation was changed by the axial movement of the spool of bidirectional variable mechanism.The product of the rotating speed of the spool relative to the valve sleeve and the number of valve port on the spool determined the frequency of fluid pulse width modulation.The flow characteristics of the bidirectional variable mechanism were analyzed by simulation and test.The results showed that the bidirectional variable mechanism could achieve bidirectional flow control with duty cycle of 0 to 100%,ane there was only 1.8%deviation between the simulation and test results.The research results provide a new flow control method for hydraulic pump with fixed speed design to use under variable speed working condition.

关 键 词：双向变量机构 双向变量流量调节 流体脉宽调制 流量特性 

分 类 号：TH137.5[机械工程—机械制造及自动化]