新型无油涡旋压缩机涡旋盘的有限元分析

发布时间：2018-09-19 07:23

【摘要】：目前食品、医疗、电动汽车等行业领域所需要的压缩气体必须洁净无油。而无油涡旋压缩机作为第四代最先进的容积式流体机械,具有效率高、噪音低、结构简单、节能和高可靠性等优点,目前广泛地应用于上述领域。为了更好地了解无油涡旋压缩机的变形规律,提高涡旋压缩机的效率,本文采用有限元分析法对涡旋盘在实际工况下的变形和应力进行了详细分析。主要研究内容如下:(1)在涡旋型线几何理论的基础上,模拟计算了无油涡旋压缩机从吸气开始到排气结束整个过程中工作腔容积随主轴转角的变化;分析计算了动涡旋盘所受气体力和自转力矩随主轴转角的变化;对无油涡旋压缩机自润滑密封机构的工作原理进行了详细的阐述;(2)通过在静涡盘背面布置温度和压力传感器测得每个腔室的温度和压力,将测量得到的温度与压力作为有限元分析的输入条件,通过对动涡盘进行热分析、结构分析以及多物理场耦合分析,结果表明:涡旋齿最大变形量位于齿头部位,耦合场的最大变形量为0.169mm;采用控制变量的方法对涡旋盘在不同齿高、齿厚的条件下进行了对比分析,结果表明:涡旋齿的变形量随着齿高的增大而变大,随齿厚的增大而减小;(3)在Solidworks中完成了动静涡旋盘的模拟装配,采用有限元法对不同轴向和径向间隙装配下的涡旋盘进行了详细分析,得到了无油涡旋压缩机的最佳装配间隙,间隙值为:轴向间隙为5μm,径向间隙为20μm;对比分析了静涡旋盘外侧定位销的个数以及位置对静涡盘的变形影响;通过搭建的测试系统对0.6m3/min的无油涡旋压缩机进行了性能测试。
[Abstract]:The compressed gases needed in food, medicine, electric vehicles and other industries must be clean and oil free. The oil-free scroll compressor, as the fourth generation of the most advanced displacement fluid machinery, has the advantages of high efficiency, low noise, simple structure, energy saving and high reliability. In order to better understand the deformation law of the oil-free scroll compressor and improve the efficiency of the scroll compressor, the deformation and stress of the scroll disk under the actual working conditions are analyzed in detail by using the finite element analysis method. The main research contents are as follows: (1) on the basis of the geometry theory of the vortex line, the variation of the volume of the working chamber with the spindle rotation angle during the whole process from the beginning of suction to the end of exhaust is simulated and calculated; The variation of the air force and the rotation moment of the moving vortex disk with the spindle rotation angle is analyzed and calculated. The working principle of self-lubricating sealing mechanism of oil-free scroll compressor is described in detail. (2) temperature and pressure of each chamber are measured by placing temperature and pressure sensor on the back of static vortex disk. Taking the measured temperature and pressure as the input conditions of finite element analysis, the thermal analysis, structural analysis and multi-physical field coupling analysis of the moving vortex disk are carried out. The results show that the maximum deformation of the vortex tooth is located at the head position of the tooth. The maximum deformation of the coupling field is 0.169mm. A comparative analysis of the vortex disk with different tooth height and tooth thickness is carried out by using the control variable method. The results show that the deformation of the vortex tooth increases with the increase of the tooth height. (3) the simulation assembly of the static and static vortex disk is completed in Solidworks. The finite element method is used to analyze the vortex disk with different axial and radial clearance in detail, and the optimum assembly clearance of the oil-free scroll compressor is obtained. The clearance value is 5 渭 m for axial clearance and 20 渭 m for radial clearance. The effects of the number and position of positioning pin on the deformation of static vortex disk are compared and analyzed. The performance of 0.6m3/min oil-free scroll compressor is tested by the test system.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH45

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