發(fā)布時間：2018-04-28 14:19

  本文選題：氣門式壓縮機 + 數(shù)學模型　； 參考：《沈陽工業(yè)大學》2015年碩士論文

【摘要】：壓縮機在現(xiàn)代化建設中被廣泛應用，但隨著社會的發(fā)展科技的進步，人民對壓縮機的要求越來越高。除了對性能的要求外，目前對其噪音、尺寸、轉(zhuǎn)速等方面越來越關注。但由于壓縮機氣閥的結(jié)構和原理的限制，壓縮機在轉(zhuǎn)速、壽命及尺寸等方面的改善遇到了瓶頸。 本文針對這種情況，通過用氣門來代替氣閥的方法對壓縮機進行了改進。闡述了改進后壓縮機的工作原理并且通過PV圖，在進排氣脈動、充氣效率、轉(zhuǎn)速等方面，對改進前后壓縮機進行了對比。通過壓縮機的活塞連桿組動力學模型分析了氣缸內(nèi)容積變化同曲軸轉(zhuǎn)角的對應關系，并建立了氣門組單質(zhì)量模型，通過單質(zhì)量模型分析了氣門伴隨凸輪轉(zhuǎn)動的位移，運動速度及加速度。分析確定了氣門式壓縮機的理論可行性。由于進氣狀況對壓縮機的性能影響很大，，本文用限體積法對壓縮機進氣過程進行數(shù)值模擬計算，同時用Pro/E建立了三維幾何模型并且對模型進行了網(wǎng)格劃分。從而對壓縮機的配氣正時進行了研究，其中，重點分析確定了壓縮機在不同轉(zhuǎn)速時的最佳進氣遲閉角。當壓縮機的轉(zhuǎn)速在1200rpm至1600rpm時，最佳進氣遲閉角為35°，在1600rpm至2800rpm時，最佳進氣遲閉角為40°，在2800rpm至3600rpm時，佳進氣遲閉角為45°。結(jié)果表明，隨著壓縮機轉(zhuǎn)速的升高，進氣慣性的增大，增大進氣遲閉角能夠提高充氣效率。 本文對壓縮機進改進進行了有益的探索，通過分析現(xiàn)存的問題決定用氣門來代替進排氣系統(tǒng)中氣閥，通過進氣過程模擬計算可知改進后壓縮機在轉(zhuǎn)速、充氣量、脈動方面都有所提高。對壓縮機的性能改善有一定的意義，也對高轉(zhuǎn)速壓縮機的研制提供了一定的參考依據(jù)。
[Abstract]:Compressors are widely used in modern construction, but with the development of science and technology, people are demanding more and more compressor. In addition to the performance requirements, the current noise, size, speed and other aspects of increasing attention. However, due to the limitation of the structure and principle of the compressor valve, the improvement of the compressor in speed, life and size has met the bottleneck. In this paper, the compressor is improved by using valve instead of valve. This paper expounds the working principle of the improved compressor and compares the compressor before and after the improvement with PV diagram in the aspects of inlet and exhaust pulsation, gas filling efficiency, rotational speed and so on. The relationship between the volume change in the cylinder and the crankshaft rotation angle is analyzed by means of the dynamic model of the piston connecting rod group of the compressor, and the single mass model of the valve group is established, and the displacement of the valve following the cam rotation is analyzed by the single mass model. Velocity and acceleration of motion. The theoretical feasibility of valve compressor is analyzed and determined. Because the intake condition has a great influence on the compressor performance, this paper uses the volumetric limiting method to simulate the intake process of the compressor. At the same time, the three-dimensional geometric model is established by Pro/E and the model is meshed. In this paper, the timing of the compressor is studied, and the optimum inlet delay closing angle of the compressor at different rotational speeds is determined. When the speed of compressor is from 1200rpm to 1600rpm, the optimum inlet delay closing angle is 35 擄, when 1600rpm to 2800rpm, 40 擄, and 45 擄when 2800rpm to 3600rpm. The results show that with the increase of compressor speed and the increase of intake inertia, increasing the inlet delay closing angle can improve the gas filling efficiency. Through analyzing the existing problems, it is decided to replace the valve in the intake and exhaust system by analyzing the existing problems. Through the simulation calculation of the intake process, we can know the speed and volume of the improved compressor. The pulsation has improved. It has a certain significance to improve the performance of compressor, and also provides a certain reference for the development of high speed compressor.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TH457

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