Abstract The existing asynchronous suction scroll vacuum pump with only one suction port has higher area utilization ratio than that of the existing synchronous suction scroll vacuum pump with two suction ports, but its built-in volume ratios of two groups of working chambers are not equal, which leads to mixing of gases at different pressures at the end of the compression process, and creates irreversible losses. In order to solve this problem, an asymmetrical twin-circular arc modified method was proposed in this study; and then a new type of asymmetrical twin-circular arc modified wrap (ACMW) with only one suction port, whose built-in volume ratios of two groups of working chambers are equal, was constructed. In addition, influences of its geometric parameters on the working performance of the scroll vacuum pump were studied, and 3D numerical simulations of its working process were conducted and compared. The study results demonstrate that wrap of the proposed orbiting scroll becomes thicker while wrap of the proposed fixed scroll is gradually thinner, as offset distance δ increases. The novel ACMW will play an important role in improving the working performance of the scroll vacuum pumps.

中文翻译：

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用于涡旋真空泵的新型非对称涡卷的构造与仿真

摘要 现有的只有一个吸入口的异步吸入涡旋真空泵比现有的两个吸入口的同步吸入涡旋真空泵具有更高的面积利用率，但其两组工作腔的内置容积比不相等，这导致在压缩过程结束时不同压力下的气体混合，并产生不可逆的损失。针对这一问题，本研究提出了一种非对称双圆弧修正方法；然后构造了一种新型的只有一个吸入口、两组工作腔容积比相等的非对称双圆弧改进涡卷(ACMW)。此外，研究了其几何参数对涡旋真空泵工作性能的影响，并对其工作过程进行了 3D 数值模拟并进行了比较。研究结果表明，随着偏移距离δ的增加，拟议的绕动涡旋的涡卷变厚，而拟议的定涡卷的涡卷逐渐变薄。新型ACMW将在提高涡旋真空泵的工作性能方面发挥重要作用。