风冷无油涡旋空气压缩机热力学及涡盘变形研究
发布时间：2018-11-27 18:53
【摘要】：由于压缩介质和应用场合的不同，风冷无油涡旋空气压缩机有着排气孔较大、负修正角双圆弧修正等结构特点，导致对称腔的排气过程不同步，同时由于冷却风的影响，空气压缩过程和结构的变形变得复杂。为了给设计过程中的关键问题提供理论依据和具体参考，本论文系统研究了风冷无油涡旋空气压缩机的几何理论、热力学、结构温度场、机构动力学、应力分布及结构变形。 根据边界曲线的运动过程及相对位置关系，构建了风冷无油涡旋空气压缩机的几何模型解析式，初步分析了气体压缩过程状态的转变，为热力学计算、涡盘温度场计算做好准备。 在几何数学模型的基础上，基于开口系统热力学第一定律、泄露模型、换热模型，构建了风冷无油涡旋空气压缩机热力学计算模型，研究了换热过程的变化规律，分析了压缩过程空气状态的变化规律及主要影响因素，完成了压缩区域热通量的计算。 通过热通量计算，把气体压缩时的动态换热过程转换为静态边界条件，提出以涡齿温度线性起始角和动定盘压缩区域平均温差为调整参数，交替计算热力学过程和涡盘温度场，得到了与涡齿温度测量值和热力学温度边界条件相符的涡盘温度场计算结果，分析了涡齿和散热区域温度分布规律，同时对热力学计算温度边界条件进行了修正。 构建了主要零部件的动力学模型，分析了作用力变化规律及波动情况，，结合结构温度场计算结果，研究了不同运行时刻结构变形的分布规律和变化情况，分析了作用力对结构变形的影响，并对结构进行了强度校核。 根据装配关系，研究了结构变形后压缩区域的干涉大小及分布，在避免涡盘碰撞的前提下，以减少泄露为目标，提出了涡齿修正方法。
[Abstract]:Because of the difference between the compression medium and the application situation, the air-cooled oil-free scroll air compressor has the characteristics of large exhaust hole, negative correction angle, double circular arc correction and so on, which leads to the non-synchronization of the exhaust process of the symmetrical cavity and the influence of the cooling air. The process of air compression and the deformation of the structure become complicated. In order to provide theoretical basis and specific reference for the key problems in the design process, the geometry theory, thermodynamics, structural temperature field, mechanism dynamics, stress distribution and structural deformation of air-cooled oil-free scroll air compressor are systematically studied in this paper. According to the movement process and relative position relation of the boundary curve, the geometric model of air-cooled oil-free scroll air compressor is established, and the transformation of the state of the gas compression process is analyzed preliminarily, which is a thermodynamic calculation. The temperature field of the vortex disk is ready to be calculated. On the basis of geometric mathematical model, based on the first law of thermodynamics, leakage model and heat transfer model of open air system, the thermodynamic calculation model of air-cooled oil-free scroll air compressor is constructed, and the variation law of heat transfer process is studied. The variation law of air state and the main influencing factors during compression are analyzed, and the calculation of heat flux in compression region is completed. Through heat flux calculation, the dynamic heat transfer process during gas compression is transformed into static boundary condition. The linear starting angle of vortex tooth temperature and the average temperature difference in the compression region of moving disk are used as the adjusting parameters to calculate the thermodynamic process and the vortex temperature field alternately. The calculated results of the vortex disk temperature field in accordance with the measured values of the vortex tooth temperature and the thermodynamic temperature boundary conditions are obtained. The temperature distribution in the vortex tooth and heat dissipation region is analyzed and the thermodynamic calculation temperature boundary conditions are modified at the same time. The dynamic model of main parts is constructed, and the law of force variation and fluctuation are analyzed. The distribution and variation of structural deformation at different running times are studied by combining with the calculation results of structure temperature field. The influence of the force on the deformation of the structure is analyzed, and the strength of the structure is checked. According to the assembly relation, the interference size and distribution of the compression region after the deformation of the structure are studied. In order to reduce the leakage, a vortex tooth correction method is put forward on the premise of avoiding the collision of the vortex disk.
【学位授予单位】：南昌大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TH45
本文编号：2361732
[Abstract]:Because of the difference between the compression medium and the application situation, the air-cooled oil-free scroll air compressor has the characteristics of large exhaust hole, negative correction angle, double circular arc correction and so on, which leads to the non-synchronization of the exhaust process of the symmetrical cavity and the influence of the cooling air. The process of air compression and the deformation of the structure become complicated. In order to provide theoretical basis and specific reference for the key problems in the design process, the geometry theory, thermodynamics, structural temperature field, mechanism dynamics, stress distribution and structural deformation of air-cooled oil-free scroll air compressor are systematically studied in this paper. According to the movement process and relative position relation of the boundary curve, the geometric model of air-cooled oil-free scroll air compressor is established, and the transformation of the state of the gas compression process is analyzed preliminarily, which is a thermodynamic calculation. The temperature field of the vortex disk is ready to be calculated. On the basis of geometric mathematical model, based on the first law of thermodynamics, leakage model and heat transfer model of open air system, the thermodynamic calculation model of air-cooled oil-free scroll air compressor is constructed, and the variation law of heat transfer process is studied. The variation law of air state and the main influencing factors during compression are analyzed, and the calculation of heat flux in compression region is completed. Through heat flux calculation, the dynamic heat transfer process during gas compression is transformed into static boundary condition. The linear starting angle of vortex tooth temperature and the average temperature difference in the compression region of moving disk are used as the adjusting parameters to calculate the thermodynamic process and the vortex temperature field alternately. The calculated results of the vortex disk temperature field in accordance with the measured values of the vortex tooth temperature and the thermodynamic temperature boundary conditions are obtained. The temperature distribution in the vortex tooth and heat dissipation region is analyzed and the thermodynamic calculation temperature boundary conditions are modified at the same time. The dynamic model of main parts is constructed, and the law of force variation and fluctuation are analyzed. The distribution and variation of structural deformation at different running times are studied by combining with the calculation results of structure temperature field. The influence of the force on the deformation of the structure is analyzed, and the strength of the structure is checked. According to the assembly relation, the interference size and distribution of the compression region after the deformation of the structure are studied. In order to reduce the leakage, a vortex tooth correction method is put forward on the premise of avoiding the collision of the vortex disk.
【学位授予单位】：南昌大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TH45
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