双定子摆动液压马达泄漏与容积效率分析及密封改进  

Analysis of leakage and volumetric efficiency and seal improvement for double-stator swing hydraulic motor

作　　者：闻德生[1] 商旭东 顾攀[1] 潘为圆 石滋洲 郑伟[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004

出　　处：《农业工程学报》2017年第12期74-81,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50975246)

摘　　要：为了详细分析双定子摆动液压马达的泄漏和容积效率,获得合理的间隙密封尺寸和密封结构改进方案,基于双定子摆动液压马达内部结构的分析,归纳出内、外马达的几何排量计算式,分析出该马达的主要泄漏途径。通过建立各泄漏途径的流量数学式,得到马达在不同连接形式下总泄漏量的一般公式。对不同连接形式下马达的容积效率进行了理论计算,针对马达的端面泄漏提出了密封结构改进方案,同时搭建试验台对改进前后的双定子摆动液压马达样机进行了容积效率测试。结果表明,随着马达进出口压差从1 MPa逐渐升高到10 MPa,马达的容积效率随之降低;且在不同的连接方式下,马达的容积效率也不相同,当进出油口压差一定时,外马达单独工作容积效率最高,内、外马达差动工作容积效率最低。如当马达行程时间为3 s,进出油口压差为4 MPa时,马达容积效率最大值约为92%,最小值约为86%。并且对该马达端面密封的改进可使其容积效率在一定程度上有所提高。该研究为双定子摆动液压马达的设计和应用提供参考。In view of the problem that the existing swing hydraulic motor can only output one torque and one rotation speed, a new type of double-stator swing hydraulic motor is put forward, which combines the structure of vane swing hydraulic motor and the thought of double-stator. This motor consists of a rotor, an inner-stator and an outer-stator to form 2 groups of motors in one case. This motor can achieve a variety of connections, such as inner motors working alone, outer motors working alone,inner and outer motors working together, and inner and outer motors working differentially, so this motor can realize multistage speed and multistage torque output through changing its connections. In order to accurately analyze the leakage and volumetric efficiency of the double-stator swing hydraulic motor, and to obtain some reasonable gap seal size and seal structure improvement proposals. Through the analysis of the internal structure of double-stator swing hydraulic motor, the geometric displacement calculation formulas of inner and outer motors are summed up and the main intemal leakage paths are analyzed; the ma!n internal leakage patl）, s consist of end face clearance and radial clearance leakage. A general formula of the total leakage is obtained through establishing the flow＇s mathematical expression of every leakage path. The total leakage of this motor is not only related to its internal structure, but also related to the speed and pressure. The volumetric efficiency of this swing hydraulic.motor in different connections is calculated theoretically.. Eyery leakag.e of inner and outer motors is calculated theoretically, and the end face clearance leakage of motors is relatively bigger than the radial clearance leakage. The end face clearance leakage of outer motor accounts for 94% of the total leakage of outer motor, and the end face clearance leakage of inner motor accounts for 73% of the total leakage of inner motor. The maximum and ayerage leakages of the double-stator swing hydraulic motor are calculated theor

关 键 词：液压马达 定子 转子 泄漏 几何排量 容积效率 

分 类 号：TH137.15[机械工程—机械制造及自动化]