油液含气的轴向斜柱塞泵流动特性研究

发布时间：2018-04-06 01:11

本文选题：含气油液　切入点：流体属性　出处：《西南石油大学》2017年硕士论文

【摘要】：液压泵是液压系统的动力元件,在液压系统中占据重要地位。在各类液压泵中,轴向柱塞泵因具有额定压力高、效率高、体积小且寿命长等优点,在工业液压、行走液压领域中得到了广泛应用。轴向柱塞泵的流量脉动和压力冲击现象等统称为柱塞泵的流动特性,是影响柱塞泵流体噪声的主要因素,准确得到其流动特性对于低噪声高性能轴向柱塞泵研发具有重要意义。因此,本学位论文以某型轴向斜柱塞泵为研究对象,针对其流动特性展开研究,目的在于提高轴向斜柱塞泵流动特性理论模型和仿真模型精度、准确获得轴向斜柱塞泵流动特性。研究方法和所得结论具有理论意义和实际价值。本学位论文的研究工作主要有以下几个方面:(1)指出本学位论文的研究背景和目的意义,对国内外轴向柱塞泵流动特性相关领域研究概况进行调研和综述,在此基础上确定了本学位论文的研究内容和研究方法。(2)基于质量守恒定律和液压油液流体属性定义,建立了含气油液流体属性理论模型,特别是有效体积弹性模量理论模型,通过数值计算并与现有研究成果对比验证了理论模型的正确性,并计算了初始含气量和升压时间对有效体积弹性模量的影响规律。(3)基于轴向斜柱塞泵结构组成和工作原理,对轴向斜柱塞泵关键部件进行了运动学和动力学分析,建立了柱塞运动学及柱塞/滑靴组和斜盘动力学方程;基于柱塞腔封闭控制体积思想,建立了单柱塞腔压力流量动态方程,给出了不同过渡区结构的配流盘过流面积和关键运动副泄露流量计算方法。(4)基于子模型开发平台AMESet,依据前述所建含气油液流体属性理论模型、轴向斜柱塞泵运动学和动力学方程,分别开发了流体属性通用仿真子模型和斜柱塞泵柱塞/斜盘通用仿真子模型;基于仿真平台AMESim,依据单柱塞腔压力流量动态方程、不同过渡区结构配流盘过流面积及关键运动副泄露流量计算方法,分别建立了考虑泄露情况的单柱塞仿真模型和配流盘仿真模型;最后,建立了完善的整泵流动特性仿真模型。(5)基于前述所建轴向斜柱塞泵流动特性仿真模型,对不同运行工况和泵体结构参数下轴向斜柱塞泵流动特性进行了仿真研究,其中运行工况包括油液初始含气量、主轴转速和负载压力,泵体结构参数包括斜盘倾角和柱塞倾角;对不同过渡区结构(包括阻尼小孔和三角槽)的配流盘下轴向斜柱塞泵流动特性进行了仿真研究,给出了不同配流盘过渡区较优的结构参数选择准则;最后进行了配流盘过渡区结构参数的组合优选,得到了计算结果靠近理论最优过流面积的配流盘过渡区结构参数组合。
[Abstract]:Hydraulic pump is the power component of hydraulic system and plays an important role in hydraulic system.Among all kinds of hydraulic pumps axial piston pump has been widely used in the field of industrial hydraulic and walking hydraulic because of its advantages of high rated pressure high efficiency small volume and long life.The flow characteristics of axial piston pump, such as flow pulsation and pressure impact, are the main factors that affect the flow noise of piston pump. It is important for the research and development of low noise and high performance axial piston pump to get its flow characteristics accurately.Therefore, in this dissertation, the flow characteristics of a certain type of axial piston pump are studied in order to improve the accuracy of the theoretical model and the simulation model of the flow characteristics of the axial piston pump.The flow characteristics of axial plunger pump are obtained accurately.The research methods and conclusions are of theoretical significance and practical value.The research work of this dissertation mainly includes the following aspects: 1) pointing out the research background and purpose significance of this dissertation, investigating and summarizing the related fields of flow characteristics of axial piston pump at home and abroad.Based on the conservation law of mass and the definition of hydraulic fluid properties, the theoretical model of gas-bearing oil fluid properties, especially the effective volume elastic modulus theory model, is established.The validity of the theoretical model is verified by numerical calculation and compared with existing research results, and the effect of initial gas content and boost time on the effective bulk elastic modulus is calculated.The kinematics and dynamics of the key components of the axial plunger pump are analyzed, and the kinematics of the plunger, the dynamic equations of the plunger / slide boot group and the tilted disk are established, and the control volume of the plunger cavity is considered based on the closed control of the plunger cavity.The dynamic equation of pressure and flow in a single plunger cavity is established.In this paper, the calculation method of flow passing area and leakage flow rate of key motion pair of distribution disc with different transition zone structure is given. The method is based on AMESet. and the theoretical model of oil and fluid properties of gas containing gas is established.Based on the kinematics and dynamics equations of axial piston pump, the general simulation sub-model of fluid properties and the general simulation sub-model of plunger / disk of inclined plunger pump are developed respectively, and the dynamic equations of pressure and flow in single plunger cavity are based on the simulation platform AMESim.The simulation model of single plunger and the simulation model of distribution disk are established respectively by calculating the flow area and leakage flow rate of key moving pairs in different transition zones. Finally, the simulation model of single plunger and the simulation model of distribution disk are established respectively.Based on the simulation model of flow characteristics of axial synclinal piston pump, the flow characteristics of axial piston pump under different operating conditions and pump body structure parameters are simulated and studied.The operating conditions include the initial gas content of oil, spindle speed and load pressure, and the pump body structure parameters include tilting angle and plunger inclination angle.The flow characteristics of axial piston pump with different transition zone structures (including damping holes and triangular grooves) under the distribution disk are simulated and the optimal structural parameters selection criteria for different transition zones are given.Finally, the structural parameters of the transition zone of the distribution disk are selected, and the structural parameters of the transition zone of the distribution disk are obtained, which are close to the theoretical optimal flow area.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.51

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