【摘要】：雙螺桿真空泵工作時(shí),腔內(nèi)的氣體流動(dòng)狀態(tài)非常復(fù)雜,難以通過實(shí)驗(yàn)方法來對(duì)其轉(zhuǎn)子、流場(chǎng)等進(jìn)行有效的研究。而有限元方法與實(shí)驗(yàn)方法相比,具有靈活、高效、直觀、經(jīng)濟(jì)、操作性強(qiáng)等特點(diǎn),非常適合對(duì)螺桿泵研發(fā)設(shè)計(jì)的前期研究。本文運(yùn)用理論計(jì)算與有限元分析相結(jié)合的方法,分別對(duì)螺桿泵動(dòng)平衡前后轉(zhuǎn)子的動(dòng)力學(xué)性能,轉(zhuǎn)子及泵腔的熱變形情況和泵腔內(nèi)流場(chǎng)進(jìn)行了對(duì)比分析和研究。其主要內(nèi)容如下:1.選取球墨鑄鐵QT500-7作為轉(zhuǎn)子材料,且通過理論計(jì)算證明其完全滿足螺桿泵對(duì)其性能要求。建立了動(dòng)平衡前后陽轉(zhuǎn)子的有限元模型,對(duì)其應(yīng)力及力變形進(jìn)行數(shù)值模擬分析,得到了動(dòng)平衡前后陽轉(zhuǎn)子的等效應(yīng)力分布及力變形情況,并進(jìn)行了對(duì)比分析;2.建立了動(dòng)平衡前后的轉(zhuǎn)子及腔體的有限元模型,并對(duì)其進(jìn)行熱分析,得到了溫度場(chǎng)的分布規(guī)律及熱變形情況。且對(duì)動(dòng)平衡前后轉(zhuǎn)子及腔體的熱變形結(jié)果進(jìn)行了對(duì)比分析,并分別計(jì)算了排氣口溫度150℃到300℃之間的四個(gè)工況的轉(zhuǎn)子熱變形情況,給出了預(yù)留裝配間隙的建議值;3.根據(jù)相似性原理,建立了簡(jiǎn)化的螺桿泵腔內(nèi)流場(chǎng)的有限元模型�；贔LUENT,運(yùn)用動(dòng)網(wǎng)格技術(shù)進(jìn)行有限元分析,得到了泵腔內(nèi)氣體的壓力場(chǎng)、速度場(chǎng)及溫度場(chǎng)的分布情況,揭示了流場(chǎng)的變化規(guī)律,且能夠清晰的捕捉返流情況、噪音來源等。本文的研究?jī)?nèi)容及所得結(jié)論為項(xiàng)目研究的對(duì)象雙螺桿真空泵的優(yōu)化設(shè)計(jì)提供了理論依據(jù)及研究方法,具有一定的理論意義與實(shí)用價(jià)值。
[Abstract]:When twin-screw vacuum pump is working, the gas flow in the cavity is very complicated, so it is difficult to study the rotor and flow field effectively by experimental method. Compared with the experimental method, the finite element method is flexible, efficient, intuitive, economical and operational, so it is very suitable for the preliminary research on the design of screw pump. In this paper, the dynamic performance of the rotor before and after the dynamic balance of the screw pump, the thermal deformation of the rotor and the pump cavity and the flow field in the pump cavity are compared and analyzed by the method of combining the theoretical calculation with the finite element analysis. Its main content is as follows: 1. The ductile iron QT500-7 is selected as the rotor material, and the theoretical calculation proves that QT500-7 fully meets the requirements of the screw pump. The finite element model of the positive rotor before and after dynamic balance is established. The stress and force deformation of the positive rotor are numerically simulated and analyzed. The distribution of equivalent stress and the force deformation of the positive rotor before and after the dynamic balance are obtained, and the comparative analysis is carried out. The finite element model of rotor and cavity before and after dynamic balance is established, and the thermal analysis is carried out. The distribution of temperature field and the thermal deformation are obtained. The results of thermal deformation of rotor and cavity before and after dynamic balance are compared and analyzed, and the hot deformation of rotor under four working conditions with exhaust port temperature between 150 鈩，

本文編號(hào)：2138392