双螺杆真空泵特性参数研究
发布时间：2018-07-22 19:53
【摘要】：双螺杆真空泵工作时,腔内的气体流动状态非常复杂,难以通过实验方法来对其转子、流场等进行有效的研究。而有限元方法与实验方法相比,具有灵活、高效、直观、经济、操作性强等特点,非常适合对螺杆泵研发设计的前期研究。本文运用理论计算与有限元分析相结合的方法,分别对螺杆泵动平衡前后转子的动力学性能,转子及泵腔的热变形情况和泵腔内流场进行了对比分析和研究。其主要内容如下:1.选取球墨铸铁QT500-7作为转子材料,且通过理论计算证明其完全满足螺杆泵对其性能要求。建立了动平衡前后阳转子的有限元模型,对其应力及力变形进行数值模拟分析,得到了动平衡前后阳转子的等效应力分布及力变形情况,并进行了对比分析;2.建立了动平衡前后的转子及腔体的有限元模型,并对其进行热分析,得到了温度场的分布规律及热变形情况。且对动平衡前后转子及腔体的热变形结果进行了对比分析,并分别计算了排气口温度150℃到300℃之间的四个工况的转子热变形情况,给出了预留装配间隙的建议值;3.根据相似性原理,建立了简化的螺杆泵腔内流场的有限元模型。基于FLUENT,运用动网格技术进行有限元分析,得到了泵腔内气体的压力场、速度场及温度场的分布情况,揭示了流场的变化规律,且能够清晰的捕捉返流情况、噪音来源等。本文的研究内容及所得结论为项目研究的对象双螺杆真空泵的优化设计提供了理论依据及研究方法,具有一定的理论意义与实用价值。
[Abstract]:When twin-screw vacuum pump is working, the gas flow in the cavity is very complicated, so it is difficult to study the rotor and flow field effectively by experimental method. Compared with the experimental method, the finite element method is flexible, efficient, intuitive, economical and operational, so it is very suitable for the preliminary research on the design of screw pump. In this paper, the dynamic performance of the rotor before and after the dynamic balance of the screw pump, the thermal deformation of the rotor and the pump cavity and the flow field in the pump cavity are compared and analyzed by the method of combining the theoretical calculation with the finite element analysis. Its main content is as follows: 1. The ductile iron QT500-7 is selected as the rotor material, and the theoretical calculation proves that QT500-7 fully meets the requirements of the screw pump. The finite element model of the positive rotor before and after dynamic balance is established. The stress and force deformation of the positive rotor are numerically simulated and analyzed. The distribution of equivalent stress and the force deformation of the positive rotor before and after the dynamic balance are obtained, and the comparative analysis is carried out. The finite element model of rotor and cavity before and after dynamic balance is established, and the thermal analysis is carried out. The distribution of temperature field and the thermal deformation are obtained. The results of thermal deformation of rotor and cavity before and after dynamic balance are compared and analyzed, and the hot deformation of rotor under four working conditions with exhaust port temperature between 150 鈩，
本文编号：2138392
[Abstract]:When twin-screw vacuum pump is working, the gas flow in the cavity is very complicated, so it is difficult to study the rotor and flow field effectively by experimental method. Compared with the experimental method, the finite element method is flexible, efficient, intuitive, economical and operational, so it is very suitable for the preliminary research on the design of screw pump. In this paper, the dynamic performance of the rotor before and after the dynamic balance of the screw pump, the thermal deformation of the rotor and the pump cavity and the flow field in the pump cavity are compared and analyzed by the method of combining the theoretical calculation with the finite element analysis. Its main content is as follows: 1. The ductile iron QT500-7 is selected as the rotor material, and the theoretical calculation proves that QT500-7 fully meets the requirements of the screw pump. The finite element model of the positive rotor before and after dynamic balance is established. The stress and force deformation of the positive rotor are numerically simulated and analyzed. The distribution of equivalent stress and the force deformation of the positive rotor before and after the dynamic balance are obtained, and the comparative analysis is carried out. The finite element model of rotor and cavity before and after dynamic balance is established, and the thermal analysis is carried out. The distribution of temperature field and the thermal deformation are obtained. The results of thermal deformation of rotor and cavity before and after dynamic balance are compared and analyzed, and the hot deformation of rotor under four working conditions with exhaust port temperature between 150 鈩，
本文编号：2138392
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