本文選題：搖擺斜盤式傳動機構 + 排量　； 參考：《湖南科技大學》2016年碩士論文

【摘要】：變排量車載空調壓縮機SD7V16,其關鍵機構—搖擺斜盤式傳動機構,可以將主軸的高速旋轉運動,傳遞為活塞的壓縮、排氣、膨脹、吸氣四個工作過程。SD7V16利用斜盤傾斜角的變化來改變活塞的行程,從而實現(xiàn)排量的可連續(xù)變化,最終實現(xiàn)SD7V16可根據實際工況隨時匹配相應的制冷量。SD7V16車載空調壓縮機有七個活塞和氣缸,由一個活塞行程偏差引起的排量的微小偏差可能宏觀上感覺不到。因主軸允許持續(xù)轉速最高可達7000r/min,若七個活塞均有一定程度的行程偏差,則在一段時間內累積的總排量偏差,是不可忽略的,甚至可能影響到宏觀上汽車空調制冷的效果。因此,對SD7V16的搖擺斜盤式傳動機構展開運動精度分析與公差優(yōu)化設計具有重要意義。本文,以SD7V16的搖擺斜盤式傳動機構為主要研究對象,展開考慮制冷性能約束的關鍵零部件尺寸公差優(yōu)化設計。全文具體研究內容如下:(1)介紹了SD7V16的結構,分析SD7V16型車載空調壓縮機的調溫原理與排量控制原理。還介紹了制冷劑R134a、制冷性能參數(shù)COP、排量與制冷量的計算。對SD7V16斜盤傾斜角與活塞行程關系進行了實驗,得出24組數(shù)據,將實驗數(shù)據曲線擬合與理論計算出的方程曲線進行對比與分析。對某工況下SD7V16的制冷量進行了計算。(2)根據SD7V16關鍵機構的傳動原理,建立數(shù)學模型,對關鍵機構進行了運動學分析。得出了活塞的位移、速度、加速度計算公式,進而求出排量的幾何算法。引入關鍵零部件尺寸偏差,分析了活塞的運動精度,及其運動精度對排量的影響。通過Adams對SD7V16關鍵機構進行虛擬樣機仿真,仿真結論驗證了基于該數(shù)學模型的理論思路可行,計算結果正確。(3)根據求出的排量與關鍵尺寸的函數(shù)關系,并根據排量與制冷量的函數(shù)關系,進而求出制冷量與關鍵尺寸的函數(shù)關系。求解最大斜盤傾斜角24°時,制冷量偏差ΔQ0與壓縮機關鍵零部件尺寸偏差的偏微分方程,做為關鍵零部件尺寸公差優(yōu)化的性能約束。最后引入關鍵零部件尺寸公差的經濟加工精度約束,結合調研數(shù)據。以質量損失成本與加工成本之和為目標函數(shù)(求最小值),基于MATLAB遺傳算法,求解公差優(yōu)化模型。
[Abstract]:Variable displacement air conditioner compressor SD7V16, its key mechanism-swinging skew disk transmission mechanism, can be the spindle of high-speed rotation motion, transfer to the piston compression, exhaust, expansion, Inhale four working processes. SD7V16 changes the stroke of the piston by changing the tilting angle of the tilted disk, thus realizing the continuous variation of the displacement. Finally, according to the actual working conditions, SD7V16 can match the corresponding refrigerating capacity. SD7V16 air conditioner compressor has seven pistons and cylinders. The small deviation of displacement caused by one piston stroke deviation may not be felt macroscopically. Because the maximum continuous rotation speed of the spindle can be as high as 7 000 r / min, if the seven pistons have a certain degree of stroke deviation, the total displacement deviation accumulated in a period of time can not be ignored, and may even affect the effect of automobile air conditioning refrigeration on the macro scale. Therefore, it is of great significance to analyze the unfolded motion accuracy and the tolerance optimization design of SD7V16 swing skew drive mechanism. In this paper, the swing skew disk transmission mechanism of SD7V16 is taken as the main research object, and the dimension tolerance optimization design of key parts considering refrigeration performance constraints is carried out. The structure of SD7V16 is introduced, and the principle of temperature regulation and displacement control of SD7V16 type air conditioner compressor is analyzed. The calculation of refrigerant R134a, refrigeration performance parameter COP, displacement and refrigerating capacity are also introduced. The relationship between tilting angle and piston stroke of SD7V16 obliquity disk is tested and 24 groups of data are obtained. The curve fitting of experimental data and the equation curve calculated theoretically are compared and analyzed. The refrigerating capacity of SD7V16 under a certain working condition is calculated. (2) according to the transmission principle of the key mechanism of SD7V16, the mathematical model is established, and the kinematic analysis of the key mechanism is carried out. The formulas of displacement, velocity and acceleration of piston are obtained, and the geometric algorithm of displacement is obtained. The movement accuracy of piston and its influence on displacement are analyzed by introducing the dimension deviation of key parts. The virtual prototype simulation of the key mechanism of SD7V16 is carried out by Adams. The simulation results show that the theory based on the mathematical model is feasible, and the calculation results are correct. According to the functional relationship between the displacement and the refrigerating capacity, the functional relationship between the refrigerating capacity and the key size is obtained. The partial differential equation between the refrigerating capacity deviation 螖 Q _ 0 and the dimension deviation of the key parts of the compressor is solved when the maximum inclined angle is 24 擄, which is regarded as the performance constraint for the optimization of the dimensional tolerance of the key parts. Finally, the economic machining precision constraint of dimension tolerance of key parts is introduced, and the investigation data are combined. Taking the sum of the cost of mass loss and the cost of machining as the objective function, the tolerance optimization model is solved based on MATLAB genetic algorithm.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U463.851

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