360°双螺旋副旋转油缸内流动特性及效率研究

【作者】 刘伟涛；

【导师】 刘义伦；

【作者基本信息】 中南大学 ， 机械设计及理论， 2010， 硕士

【摘要】 360°双螺旋副旋转油缸较叶片式结构摆动油缸及齿轮齿条式摆动缸相比,具有体积小、回转精度高、重量轻、效率高等优点。在工程机械、建筑机械、矿山机械中具有广阔的应用前景。但是,仅美国Helac公司、德国HKS公司等少数几家公司能生产。在这样的条件下,对360°双螺旋副旋转油缸进行研究,从而实现其国产化是必然的。其主要的工作内容是：从机理上对旋转油缸的螺旋曲面复杂层流流动进行分析。利用计算流体力学的基本理论,建立液压油流动的Soildworks-Gambit-fluent数值仿真模型,给出符合实际的初始及边界条件,获得液压油在缸内螺旋副间的摩擦力随构参数及压强、活塞速度等的变化规律,并以此求得传动效率；根据能量方程、连续性方程、N-S方程,建立环形间隙液压油内泄漏的数学模型。在此基础上利用fluent软件进行数值仿真,探讨其在实际工况下,油缸内部间隙螺旋流的流动特性、内泄漏规律。为优化油缸结构参数、选择合理的制造精度、减少内泄漏、提高容积效率提供理论依据。搭建实验台,对360度双螺旋副旋转油缸进行实验,对比实验效率曲线与理论效率曲线,发现误差少,说明效率公式可信。更多还原

【Abstract】 Compared the blade structure type swinging cylinder and the gear rack and pinion type swinging cylinder,360°Double Helix Pair Hydraulic Rotary Actuator has the small volume,the high rotation precision, the light weight, the high efficiency and so on. In the engineering machinery, the construction machinery, the mining machinery had the broad application prospect. But, only American Helac Corporation, German HKS Corporation and so on minority several countries can produce. Under such condition,360°Double Helix Pair Hydraulic Rotary Actuator was researched, thus realizing its domestic manufacture is inevitably.Its main work content as follows.Firstly, Complex laminar flow in helical curve of Hydraulic Rotary Actuator was analysed from mechanism. Using computational fluid dynamics fundamental theory, the hydraulic oil flow’s Soildworks-Gambit-Fluent numerical simulation model was established. Conforming to reality initial and boundary conditions was given, Variation regularity of friction force was obtained with the structure parameters, the pressure and the piston speed etc change,and thus transmission efficiency was obtained. According to the energy equation, continuity equation, N-S equation, the internal leakage model of hydraulic oil was established within annular gap and Fluent software was used for numerical simulation.In the actual working conditions, about helix flow within gap of 360°Double Helix Pair Hydraulic Rotary Actuator, flow characteristics and internal leakage variation regularity with each factor was explored. To optimize the structure parameters, select a reasonable manufacturing precision, reduce internal leakage, provide a theoretical basis to improve volumetric efficiency.Experiment table was built and thus experiments carried out on 360°Double Helix Pair Hydraulic Rotary Actuator. Comparing the experimental efficiency curve with the theoretical efficiency curve, fewer errors was founded, indicating the efficiency formula is credible.更多还原