活塞式空气压缩机改进与分析

发布时间：2018-04-28 14:19

本文选题：气门式压缩机 + 数学模型　；参考：《沈阳工业大学》2015年硕士论文

【摘要】：压缩机在现代化建设中被广泛应用，但随着社会的发展科技的进步，人民对压缩机的要求越来越高。除了对性能的要求外，目前对其噪音、尺寸、转速等方面越来越关注。但由于压缩机气阀的结构和原理的限制，压缩机在转速、寿命及尺寸等方面的改善遇到了瓶颈。本文针对这种情况，通过用气门来代替气阀的方法对压缩机进行了改进。阐述了改进后压缩机的工作原理并且通过PV图，在进排气脉动、充气效率、转速等方面，对改进前后压缩机进行了对比。通过压缩机的活塞连杆组动力学模型分析了气缸内容积变化同曲轴转角的对应关系，并建立了气门组单质量模型，通过单质量模型分析了气门伴随凸轮转动的位移，运动速度及加速度。分析确定了气门式压缩机的理论可行性。由于进气状况对压缩机的性能影响很大，，本文用限体积法对压缩机进气过程进行数值模拟计算，同时用Pro/E建立了三维几何模型并且对模型进行了网格划分。从而对压缩机的配气正时进行了研究，其中，重点分析确定了压缩机在不同转速时的最佳进气迟闭角。当压缩机的转速在1200rpm至1600rpm时，最佳进气迟闭角为35°，在1600rpm至2800rpm时，最佳进气迟闭角为40°，在2800rpm至3600rpm时，佳进气迟闭角为45°。结果表明，随着压缩机转速的升高，进气惯性的增大，增大进气迟闭角能够提高充气效率。本文对压缩机进改进进行了有益的探索，通过分析现存的问题决定用气门来代替进排气系统中气阀，通过进气过程模拟计算可知改进后压缩机在转速、充气量、脉动方面都有所提高。对压缩机的性能改善有一定的意义，也对高转速压缩机的研制提供了一定的参考依据。
[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 掳, when 1600rpm to 2800rpm, 40 掳, and 45 掳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.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH457

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