基于Fluent的KT-400油擴(kuò)散泵設(shè)計(jì)及優(yōu)化
[Abstract]:Oil diffuser pump is one of the tools used to obtain high vacuum, and it is widely used in many fields. It has the advantages of low cost, simple structure, easy manufacture, no mechanical transmission, no vibration, no noise, convenient operation, easy maintenance and long life. The pumping rate and the oil return rate of the oil diffuser pump are the important indexes of the performance of the reaction oil diffusion pump, and how to improve the pumping rate and reduce the oil return rate of the oil diffusion pump has been the focus of the relevant research units. Generally speaking, the main factors affecting the pumping speed of the diffuser pump are nozzle diameter, nozzle throat clearance, space between different levels, cavity shape and so on. Based on the design and calculation of KT-400 oil diffuser pump, the structure dimension of oil diffuser pump is preliminarily determined. The three-dimensional modeling is carried out by using Solidworks, and the nozzle structure and angle are obtained by using the computational fluid dynamics software Fluent. At the same time, the effects of cap, ring and cavity on the steam jet are simulated numerically and optimized. The results of numerical simulation show that the structure of the nozzle can affect the velocity of the steam jet, the larger the nozzle angle, the greater the velocity of steam jet, the smaller the throat clearance, the greater the velocity of steam jet. The larger the distance between the different levels, the smaller the velocity of steam jet ejected from the first stage nozzle, the smaller the interval between stages, the interference between the steam jet of each stage, the effective prevention of steam reflux by the cap and ring; The oil return rate of convex cavity pump is lower than that of straight cavity pump.
【學(xué)位授予單位】:哈爾濱商業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TB752.42
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