本文選題：隔爆外殼　切入點(diǎn)：優(yōu)化　出處：《太原理工大學(xué)》2017年碩士論文

【摘要】：隔爆外殼一直廣泛應(yīng)用于煤礦及各種工業(yè)場(chǎng)所,通常在其內(nèi)部安裝一些交流或直流的控制設(shè)備,如變頻器、軟起動(dòng)器等。通過將這些電氣設(shè)備安裝在隔爆外殼內(nèi),可以有效防止殼體內(nèi)的電路系統(tǒng)由于故障所產(chǎn)生的電火化在點(diǎn)燃?xì)んw內(nèi)的瓦斯氣體后通過法蘭傳導(dǎo)至殼體外部從而點(diǎn)燃?xì)んw外的瓦斯氣體,引發(fā)更嚴(yán)重的瓦斯爆炸,因此殼體的質(zhì)量對(duì)于礦井的安全十分重要。而目前在制造殼體時(shí),對(duì)于隔爆外殼的壁厚確定沒有十分明確的依據(jù),往往是制造人員在理論計(jì)算的基礎(chǔ)上,為了確保安全,根據(jù)自己的經(jīng)驗(yàn),再增加一定的厚度,這樣致使殼體的壁面應(yīng)力儲(chǔ)備過大,過于笨重。這些電氣設(shè)備有時(shí)需要隨著采掘工作面的推進(jìn)而不斷移動(dòng),有時(shí)其搬遷還需要經(jīng)過多次重裝,因此其質(zhì)量過大就顯得十分不便,為了解決這些問題,本文選取一類較常用的隔爆軟起動(dòng)器外殼進(jìn)行研究。首先根據(jù)隔爆外殼使用的電流電壓環(huán)境以及外殼內(nèi)部工作的電路系統(tǒng)對(duì)殼體內(nèi)的各種主要器件進(jìn)行選型,并根據(jù)電路系統(tǒng)及各器件的具體尺寸以及爬電距離等規(guī)定對(duì)器件進(jìn)行合理的布局,根據(jù)布局確定了隔爆外殼的具體尺寸。通過查詢資料,確定該容積的隔爆外殼的具體壁面參數(shù),按照隔爆外殼的試驗(yàn)要求,借助三維建模軟件Solidworks對(duì)隔爆軟起動(dòng)器殼體建模,結(jié)合有限元分析軟件Workbench仿真隔爆外殼的具體試驗(yàn)情況。在對(duì)模擬結(jié)果進(jìn)行分析后,發(fā)現(xiàn)試驗(yàn)過程中殼體的不同壁面應(yīng)力分布均不相同,為了保證隔爆外殼能在礦井下安全使用,必須要保證外殼的最大應(yīng)力不能超過該種材料的許用應(yīng)力,便可以對(duì)該外殼的壁厚進(jìn)行合理優(yōu)化。本文決定利用Workbench中提供的零階方法對(duì)隔爆外殼做優(yōu)化計(jì)算。首先對(duì)外殼進(jìn)行參數(shù)化建模,對(duì)需要優(yōu)化的參數(shù)設(shè)定允許優(yōu)化的范圍,在設(shè)置了循環(huán)次數(shù)后,根據(jù)軟件提供的設(shè)計(jì)點(diǎn),對(duì)外殼進(jìn)行優(yōu)化,根據(jù)得到的優(yōu)化結(jié)果,選出最理想的優(yōu)化數(shù)據(jù)。在完成對(duì)殼體的優(yōu)化后,決定利用瓦斯爆炸對(duì)殼體進(jìn)行耐爆性試驗(yàn)。本文采用單向流固耦合的方法,通過創(chuàng)建瓦斯爆炸的數(shù)學(xué)模型,借助流體軟件Fluent模擬瓦斯爆炸的具體情況,并導(dǎo)出爆炸過程中的溫度變化圖,根據(jù)相應(yīng)的溫度變化,確定爆炸反應(yīng)最激烈的時(shí)刻,將該時(shí)刻的爆炸數(shù)據(jù)加載到隔爆外殼內(nèi)壁上,求解其應(yīng)力以及應(yīng)變。通過對(duì)計(jì)算結(jié)果分析可知,由于爆炸過程中殼體內(nèi)的壓力處處不同,致使殼體壁面的應(yīng)力呈無(wú)規(guī)則狀分布,其應(yīng)力的最大值未超過選取材料的許用應(yīng)力,表明對(duì)外殼做的優(yōu)化計(jì)算十分成功。在完成對(duì)隔爆外殼的耐爆性試驗(yàn)后,需要對(duì)其進(jìn)行隔爆性試驗(yàn)。利用瓦斯爆炸過程中得到的爆炸數(shù)據(jù),獲得殼體內(nèi)的溫度云圖,選取法蘭門溫度最高處進(jìn)行模擬,發(fā)現(xiàn)隔爆結(jié)合面過長(zhǎng)。針對(duì)模擬結(jié)果,并根據(jù)國(guó)標(biāo)要求,對(duì)隔爆結(jié)合面長(zhǎng)度進(jìn)行合理的縮短。在完成對(duì)隔爆軟起動(dòng)器的整體試驗(yàn)及優(yōu)化后,根據(jù)現(xiàn)有的試驗(yàn)條件,對(duì)其進(jìn)行水壓試驗(yàn),對(duì)試驗(yàn)結(jié)果進(jìn)行分析發(fā)現(xiàn),試驗(yàn)過程中,殼體未發(fā)生損壞,該殼體是合格的,殼體壁厚以及質(zhì)量有了一定的減小,為該規(guī)格的隔爆外殼制造提供了一定的參考價(jià)值。
[Abstract]:The flameproof enclosure has been widely used in coal mine and various industrial sites, usually installed control devices, some AC or DC in its interior such as inverter, soft starter. The electrical equipment installed in the flameproof enclosure, can effectively prevent the circuit system of the shell due to gas electric spark generated by faults in gas the gas lit shell by conduction to the outside of the casing flange shell is ignited, causing a gas explosion is more serious, so the quality of housing is very important for the safety of mine. At present, in the manufacture of shell, flameproof enclosure wall thickness to determine no clear basis, which is fundamental in the theory of manufacturing personnel on the calculation, in order to ensure the safety, according to their own experience, add a certain thickness, so the wall surface of the casing stress reserve is too large, the electrical equipment are too heavy. Preparation of sometimes need along with the mining working face advancing and moving, sometimes the relocation also need several reloading, so its quality is too large it is very inconvenient, in order to solve these problems, this paper selects a kind of more commonly used flameproof soft starter shell was studied. Firstly, according to the selection of circuit system of flameproof shell using current voltage the inside of the housing and the work of a variety of main devices in the shell, and depending on the size of the circuit system and the devices and creepage distance and other provisions of the device for a reasonable layout, according to the specific size to determine the layout of the flameproof enclosure. By querying the data, determine the specific volume of the shell wall burst across the face in accordance with the requirements of the test parameters of flameproof enclosure, using 3D modeling software Solidworks on Flameproof soft starter shell model with the finite element analysis software Workbench, simulation The specific test explosion case. In the analysis of the simulation results, found that different wall shell test in the process of stress distribution are not the same, in order to ensure the flameproof shell can be used safely in the mine, we must ensure that the shell maximum stress should not exceed the permissible stress, can the shell thickness is optimized. This paper decided to use zero order method in Workbench of flameproof shell do optimization calculation. Firstly, parametric modeling of the shell, setting range allows optimization of the parameters need to be optimized, in the setting of a cycle times, according to the design provided by the software, the shell optimized according to the optimization results obtained, choose the optimized data ideal. After the completion of the housing after optimization, decided to use the gas explosion on the shell of blast resistance test. This paper uses the method of one-way flow solid coupling, through A mathematical model of gas explosion, the specific circumstances by fluid software Fluent to simulate the gas explosion, and the explosion process of temperature variation is derived, according to the temperature change accordingly, determine the most intense explosion reaction time, the explosion loading data of the time to the flameproof enclosure wall, solving the stress and strain. Through the analysis of the calculation results, the explosion in the shell pressure everywhere, the shell wall stress of irregularly shaped distribution, the maximum stress does not exceed the allowable stress of the material selection, optimization of housing that doing the calculation was very successful. After the completion of the explosion resistance of vibration explosive shells, needs to carry on the explosion test. The data obtained by the explosion of gas explosion process, obtain the temperature nephogram of the shell, the highest temperature at the door flange selected for simulation, the flameproof combination The surface is too long. According to the simulation results, and according to the national standard, the flameproof combined surface length reasonably shortened. After the completion of the overall test and optimization of flameproof soft starter, according to the experimental conditions, the water pressure test on the analysis of test results found that during the test, the shell has not damaged and the shell is qualified, shell thickness and quality have been reduced, providing a certain reference value for the specification of flameproof shell manufacturing.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD684

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