本文選題：液壓彎管機　切入點：超高壓電動泵　出處：《上海交通大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：液壓彎管機是對管道進行彎曲成型的一種專用工具，廣泛地應(yīng)用于電力、石油、天然氣、化工、船舶、鍋爐等行業(yè)。 本論文在對電動液壓彎管機的工作原理、具體結(jié)構(gòu)進行分析的基礎(chǔ)上，主要圍繞著電動液壓彎管機的核心部件：超高壓電動泵而展開。由于彎管的工藝對于泵的流量穩(wěn)定性要求不是特別高，電動液壓彎管機采用了一種更為簡單的不同于傳統(tǒng)泵的超高壓電動泵。然而彎管工藝對超高壓電動泵的壓力有著特殊要求，即需要在保證泵的穩(wěn)定性和壽命前提下，盡可能高地提高泵的壓力，最高瞬態(tài)壓力高達50MPa，故稱為超高壓電動泵。隨著泵的壓力提高，需要對超高壓電動泵的關(guān)鍵部件如電機支架和電機軸等，重新設(shè)計其結(jié)構(gòu)和校核其強度。效率是超高壓電動泵的一個關(guān)鍵指標(biāo)。本論文將結(jié)合試驗和CFD仿真方法對超高壓電動泵的效率及相關(guān)影響因素進行分析，以提高其效率；同時對超高壓電動泵的鋼球運動規(guī)律和受力分析進行了一系列研究。 本論文主要研究內(nèi)容有： 1）在分析電動液壓彎管機的工作原理，動力及成型機構(gòu)等基礎(chǔ)上，建立了柱塞偶件的速度，加速度的數(shù)學(xué)方程，并基于MATLAB軟件，求解出超高壓電動泵的偏心輪及柱塞偶件的運動規(guī)律，并分析了關(guān)鍵部件電機軸和電機支架等的受力狀況。 2）借助流體動力仿真工具ANSYS CFX，對超高壓電動泵的流場進行了仿真分析，得出了入口和出口處鋼球的運動規(guī)律，求解出了進出油口鋼球的最大速度和最大位移，并將鋼球運動速度以及鋼球周圍流場的變化采用云圖及轉(zhuǎn)化為動畫格式的方式展現(xiàn)出來，借此直接表達出鋼球在上升過程中的速度變化規(guī)律及流場壓力變化。 3）采用ANSYS WORKBENCH軟件對關(guān)鍵部件進行有限元仿真分析，揭示了電機支架失效的原因，通過對電機支架的共振頻率仿真，，排除了電機支架由于共振產(chǎn)生失效的可能，同時通過金相試驗的方法，分析了電機支架破損處的顯微組織成分及焊接缺陷，提出了相應(yīng)的解決方案。 4）搭建了超高壓電動泵的試驗平臺，開展了樣機性能的試驗，結(jié)合仿真結(jié)果和試驗結(jié)果，改進了超高壓電動泵的結(jié)構(gòu)，并測試與分析了改進后的超高壓電動泵的特性，試驗結(jié)果表明，改進后的超高壓電動泵的最大效率提高到了79%。 上述研究工作和取得的結(jié)果，為今后新型超高壓電動泵的開發(fā)奠定了理論基礎(chǔ)和試驗基礎(chǔ)。
[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.

【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH137.51

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