离心式渣浆泵的摩擦磨损机理与有限元分析

发布时间：2018-05-17 05:02

本文选题：离心式渣浆泵 + 摩擦磨损机理　；参考：《江西理工大学》2012年硕士论文

【摘要】：离心式渣浆泵在现代工业中应用极为广泛，，本文所指的离心式渣浆泵主要是指输送的介质中含有固体颗粒的固液两相混合物的泵，由于泵所输送的介质中往往含有大量的酸性或碱性介质和硬质颗粒。泵在工作过程当中，其具有酸碱性的介质对泵的过流件有强烈的腐蚀作用，而硬质颗粒对泵过流件又有冲刷破坏作用。而所有过流件中磨损最为严重的则为叶轮。论文主要基于笔者在江西耐普集团、江西铜业集团德兴铜矿大山选矿厂实习期间对渣浆泵在实际工作中摩擦磨损以及失效的具体情况进行研究分析。本文首先介绍了离心式渣浆泵的工作原理以及其主要构件的工作特点，然后结合渣浆泵的磨损机理，从浆体性质、粒子粒径、硬度、形状与密度、固体颗粒在流道内的运动轨迹、运行工况以及叶轮材质等方面对渣浆泵的磨损影响以及影响规律进行了系统的研究分析。研究指出：当渣浆泵输送颗粒粒径较小或密度较小的两相流体时，且气蚀发生时，叶片出口处磨损较严重;当渣浆泵输送颗粒粒径较大或密度较大的两相流体时，叶片进口磨损较严重。而后通过分析气蚀各阶段对叶片及泵体的影响，结合近似场势的方程，对离心式渣浆泵叶片设计进行相关参数的优化设计，并用三维软件绘制优化后的立体效果图。最后以优化后的叶片为主体，进行有限元分析，验证优化后各点受力情况，并得出优化后，叶片泵磨损较传统的叶片要小，应力分布也较均匀，可有效提高泵的寿命。最后文章对渣浆泵进行有限元分析时，建立了叶轮的有限元模型，确定了叶轮的应力、应变大小和分布状况，并分别在叶轮空转与工作时对其进行有限元强度分析，结果指出：离心式渣浆泵在工作时最大应力出现在叶轮轮毂与轮体的结合部位和叶片与轮盘结合部位(即叶片根部)。为叶轮的设计提供了理论依据。
[Abstract]:The centrifugal slurry pump is widely used in modern industry. The centrifugal slurry pump in this paper mainly refers to the solid liquid two-phase mixture pump which contains solid particles in the conveying medium. Because the pump transport medium often contains a large number of acid or alkaline media and hard particles. In the working process of the pump, its acid and alkaline medium has a strong corrosion effect on the flow parts of the pump, while the hard particles have the effect of scouring and destroying the flow parts of the pump. The impeller is the most worn out of all the overflowing parts. This paper is mainly based on the research and analysis of the friction and wear and failure of slurry pump in practical work during the practice period of Dashan concentrator of Jiangxi Copper Industry Group Dexing Copper Group Group in Jiangxi Province. This paper first introduces the working principle of centrifugal slurry pump and the working characteristics of its main components, and then combines the wear mechanism of slurry pump, from the slurry properties, particle size, hardness, shape and density. The influence of solid particles on the wear and wear of slurry pump was studied and analyzed systematically in the aspects of movement track, operating condition and impeller material. It is pointed out that when slurry pump conveys two-phase fluid with smaller particle size or smaller density, and when cavitation occurs, the wear at the outlet of blade is more serious, and when slurry pump conveys two-phase fluid with larger particle size or density, Blade inlet wear is more serious. Then, by analyzing the influence of cavitation on blade and pump body, combining the equation of approximate field potential, the optimization design of relevant parameters of centrifugal slurry pump blade is carried out, and the three-dimensional effect diagram after optimization is drawn with three-dimensional software. Finally, taking the optimized blade as the main body, the finite element analysis is carried out to verify the stress at each point after the optimization, and it is concluded that the vane pump wear is smaller and the stress distribution is more uniform than that of the traditional blade after the optimization, which can effectively improve the life of the pump. Finally, the finite element model of impeller is established, and the stress, strain and distribution of impeller are determined when the slurry pump is analyzed by finite element method. The results show that the maximum stress of centrifugal slurry pump occurs in the joint part of impeller hub and wheel body and the joint position between blade and wheel disk (I. E. blade root). It provides a theoretical basis for the design of impeller.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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