液压弯管机超高压电动泵的特性研究

发布时间：2018-03-13 22:36

本文选题：液压弯管机　切入点：超高压电动泵　出处：《上海交通大学》2012年硕士论文　论文类型：学位论文

【摘要】：液压弯管机是对管道进行弯曲成型的一种专用工具，广泛地应用于电力、石油、天然气、化工、船舶、锅炉等行业。本论文在对电动液压弯管机的工作原理、具体结构进行分析的基础上，主要围绕着电动液压弯管机的核心部件：超高压电动泵而展开。由于弯管的工艺对于泵的流量稳定性要求不是特别高，电动液压弯管机采用了一种更为简单的不同于传统泵的超高压电动泵。然而弯管工艺对超高压电动泵的压力有着特殊要求，即需要在保证泵的稳定性和寿命前提下，尽可能高地提高泵的压力，最高瞬态压力高达50MPa，故称为超高压电动泵。随着泵的压力提高，需要对超高压电动泵的关键部件如电机支架和电机轴等，重新设计其结构和校核其强度。效率是超高压电动泵的一个关键指标。本论文将结合试验和CFD仿真方法对超高压电动泵的效率及相关影响因素进行分析，以提高其效率；同时对超高压电动泵的钢球运动规律和受力分析进行了一系列研究。本论文主要研究内容有： 1）在分析电动液压弯管机的工作原理，动力及成型机构等基础上，建立了柱塞偶件的速度，加速度的数学方程，并基于MATLAB软件，求解出超高压电动泵的偏心轮及柱塞偶件的运动规律，并分析了关键部件电机轴和电机支架等的受力状况。 2）借助流体动力仿真工具ANSYS CFX，对超高压电动泵的流场进行了仿真分析，得出了入口和出口处钢球的运动规律，求解出了进出油口钢球的最大速度和最大位移，并将钢球运动速度以及钢球周围流场的变化采用云图及转化为动画格式的方式展现出来，借此直接表达出钢球在上升过程中的速度变化规律及流场压力变化。 3）采用ANSYS WORKBENCH软件对关键部件进行有限元仿真分析，揭示了电机支架失效的原因，通过对电机支架的共振频率仿真，，排除了电机支架由于共振产生失效的可能，同时通过金相试验的方法，分析了电机支架破损处的显微组织成分及焊接缺陷，提出了相应的解决方案。 4）搭建了超高压电动泵的试验平台，开展了样机性能的试验，结合仿真结果和试验结果，改进了超高压电动泵的结构，并测试与分析了改进后的超高压电动泵的特性，试验结果表明，改进后的超高压电动泵的最大效率提高到了79%。上述研究工作和取得的结果，为今后新型超高压电动泵的开发奠定了理论基础和试验基础。
[Abstract]:Hydraulic pipe bending machine is a special tool for pipe bending, which is widely used in power, oil, natural gas, chemical industry, ship, boiler and other industries.
In this paper, the working principle of electric hydraulic bender, based on the analysis of the concrete structure, mainly around the core components of electric hydraulic bender: super high pressure electric pump start. As process of the pipe bending requirements flow stability of the pump is not particularly high, the electric hydraulic bender adopts a more simple different from the traditional pump electric pump. But the bending process has special requirements of super high pressure electric pump pressure, the need to ensure the stability and the service life of the pump under the premise, as high as possible to improve the pump pressure, the maximum transient pressure up to 50MPa, it is known as the super high pressure electric pump with the pump pressure. Increased need for super high pressure electric pump key components such as the motor bracket and the shaft of the motor, to the structure design and check the strength. The efficiency is a key indicator of super high pressure electric pump. This paper will combine The efficiency and related influencing factors of EHV Electric pump are analyzed by experiments and CFD simulation methods, so as to improve its efficiency. Meanwhile, a series of researches on the movement rule and stress analysis of EHV Electric Pump steel ball are carried out.
The main contents of this paper are as follows:
1) in the analysis of working principle of electric hydraulic bender, dynamic and shaping mechanism on the basis of a plunger speed, the mathematical equations of acceleration, and based on the MATLAB software, to solve the super high pressure electric pump and eccentric plunger movement, and analyzes the stress status of key parts of the motor shaft and the motor bracket.
2) with fluid dynamic simulation tool of ANSYS CFX, on the flow field of super high pressure electric pump is simulated and analyzed, obtained the motion law of the entrance and exit of the steel ball, solved the maximum velocity of oil inlet and outlet ball and maximum displacement, and the ball movement speed and change the flow field around the ball by showing images and into animation format, thereby directly express the variation of ball in the rising process variation of velocity and pressure field.
3) the finite element simulation analysis on the key components of the use of ANSYS WORKBENCH software, revealed the reasons for failure of the motor bracket, the resonance frequency of the simulation of the motor bracket, excluding motor bracket because of resonance failure may, at the same time by means of metallographic test, analysis of the damaged motor bracket microstructurecomposition position and welding defects. Put forward the corresponding solutions.
4) build a test platform of super high pressure electric pump, carried out the test performance of the prototype, combined with simulation results and experimental results, the improved structure of the super high pressure electric pump, and analysis of the improved super high pressure electric pump characteristics test and the test results show that the maximum efficiency of super high pressure electric pump improved increased to 79%.
The above research work and the results obtained have laid a theoretical foundation and experimental basis for the development of a new type of UHP electric pump in the future.

【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.51

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