本文選題：無油渦旋壓縮機 + 動力特性　； 參考：《蘭州理工大學》2017年碩士論文

【摘要】：渦旋壓縮機作為最新一代的容積式壓縮機,其可靠性高、結(jié)構(gòu)簡單、噪音小、振動低、效率高的特點使渦旋壓縮機受到各國研究者的廣泛關(guān)注。由于渦旋壓縮機工作原理的特殊性,使其對結(jié)構(gòu)精度的要求非常高,因此渦旋壓縮機動力特性的好壞將直接影響著渦旋壓縮機的性能。本文以排氣量為0.6m3/min的無油渦旋壓縮機為研究對象,對無油渦旋壓縮機的動力特性進行了定量化的詳細研究,主要研究內(nèi)容如下:(1)基于渦旋型線的平面嚙合理論和圓漸開線型線方程,建立了無油渦旋壓縮機的幾何模型,得到了各個工作腔容積隨主軸轉(zhuǎn)角的變化規(guī)律;通過對渦旋壓縮機主要運動部件小曲拐、動盤以及主軸的受力分析,建立了動力學模型,并利用數(shù)值分析方法計算出了動盤所受的氣體力及力矩、小曲拐和主軸的受力隨主軸轉(zhuǎn)角的變化,其研究結(jié)果表明:小曲拐的受力為半周受力,且兩次受力達到峰值,兩次最小為零,因為切向力遠大于其它作用力,因此主軸軸承受切向力影響最大。(2)以動力學模型為依據(jù)對渦旋壓縮機主要摩擦部件進行了摩擦損失分析,并給出了相應(yīng)的功率計算公式以及機械效率公式,其研究結(jié)果表明:主軸承的摩擦損失要遠大于其它軸承的摩擦損失,說明主軸承的摩擦損失是影響機械效率的最主要因素,渦旋壓縮機的機械效率變化幅度很小,表明渦旋壓縮機的穩(wěn)定性很高。(3)通過SolidWorks和Adams軟件對無油渦旋壓縮機進行了三維建模與虛擬裝配,并對其進行了動力學、運動學仿真計算;聯(lián)合ANSYS軟件共同建立了小曲拐的剛?cè)狁詈夏Ｐ?并對此模型進行了仿真分析,其結(jié)果表明:小曲拐與主軸具有相同的運動規(guī)律,符合小曲拐平面四桿機構(gòu)的運動規(guī)律,驗證了小曲拐防自轉(zhuǎn)機構(gòu)的可行性,三個小曲拐的應(yīng)力最大節(jié)點相同,且最大節(jié)點的應(yīng)力應(yīng)變的變化趨勢相同,說明了三個小曲拐的受力狀況與運動規(guī)律基本相同,最大變形發(fā)生的部位在退刀槽附近。(4)利用ANSYS對小曲拐與主軸的模態(tài)進行了分析,其結(jié)果表明:彎曲和扭轉(zhuǎn)是小曲拐與主軸的主要變形形式,且主軸平衡塊位置的變形較大,主軸中間部位變形很小。(5)通過搭建的新型無油渦旋壓縮機實驗平臺對開發(fā)樣機進行了性能測試,驗證了模型的正確性、仿真結(jié)果的可靠性、同時也表明開發(fā)的樣機具有良好的綜合性能。
[Abstract]:As the latest generation of volumetric compressors, scroll compressors have the characteristics of high reliability, simple structure, low noise, low vibration and high efficiency. Because of the particularity of the working principle of the scroll compressor, the structure accuracy is very high, so the dynamic characteristics of the scroll compressor will directly affect the performance of the scroll compressor. In this paper, the dynamic characteristics of oil-free scroll compressor with 0.6m3/min exhaust volume are studied in detail. The main research contents are as follows: (1) based on the planar meshing theory of the vortex profile and the circular involute line equation, the geometric model of the oil-free scroll compressor is established, and the variation of the volume of each working cavity with the rotation angle of the spindle is obtained. The dynamic model is established through the analysis of the force of the main moving parts of the scroll compressor, such as the small curved crank, the moving disk and the spindle, and the gas force and torque of the moving disk are calculated by using the numerical analysis method. The research results show that the force of Xiaoqu Gun is half circumferential, and the stress of two times reaches the peak value, and the minimum of two times is zero, because the tangential force is much larger than other forces. Therefore, the friction loss of the main friction parts of the scroll compressor is analyzed based on the dynamic model, and the corresponding power calculation formula and mechanical efficiency formula are given. The results show that the friction loss of the main bearing is much larger than that of the other bearings, indicating that the friction loss of the main bearing is the most important factor affecting the mechanical efficiency, and the variation of the mechanical efficiency of the scroll compressor is very small. The results show that the scroll compressor has high stability. (3) 3D modeling and virtual assembly of the oil-free scroll compressor are carried out by SolidWorks and Adams software, and the dynamics and kinematics simulation are carried out. The rigid-flexible coupling model of Xiaoqu crank is established by using ANSYS software, and the simulation analysis is carried out. The results show that the Xiaoqu crank has the same motion law as the spindle and accords with the motion law of the four-bar mechanism in the Xiaoqu crank plane. The feasibility of the anti-rotation mechanism is verified. The stress maximum joint of the three small curved crutches is the same, and the change trend of the stress and strain of the maximum joint is the same, which shows that the stress state and the motion law of the three small curved crutches are basically the same. The maximum deformation occurs near the receding groove. (4) the modal analysis of the small curved and main shaft is carried out by using ANSYS. The results show that the bending and torsion are the main deformation forms of the small curved and main shaft, and the deformation of the balance block of the spindle is large. A new oil-free scroll compressor experimental platform was built to test the performance of the developed prototype, which verifies the correctness of the model and the reliability of the simulation results. At the same time, it also shows that the developed prototype has good comprehensive performance.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH45

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