The rotor profiles of the claw vacuum pump mainly determine its working performance. The composition curves of the existing three-claw rotor profiles are complicated, and the compressed gas remaining in the carryover is recompressed, resulting in a remarkable increase of power consumption. For solving those problems, a sinusoidal curve was used to smoothly connect the addendum and dedendum arcs, and a novel three-claw claw rotor and its parametric equations were obtained. A novel discharge port was designed to avoid the secondary-compression of the gas in the carryover. The working process and the internal flow field of the new three-claw vacuum pump (TCVP) were revealed through numerical simulations. The mass flow rate at the proposed discharge port was also analyzed. Study results show that the proposed claw rotor has considerable advantages of simple profile, high internal volume ratio and small relative carryover. The designed discharge port realizes complete gas discharge without secondary-compression of the gas in the carryover. It is revealed that part of gas in the chamber formed by the separation of the compression chambers can flow back to the suction chamber in the compression process.

爪形真空泵的转子外形主要决定其工作性能。现有三爪转子型线组成曲线复杂，残留在夹带中的压缩气体被再压缩，导致功耗显着增加。为解决这些问题，采用正弦曲线平滑连接齿顶圆弧和齿顶圆弧，得到了一种新颖的三爪爪转子及其参数方程。设计了一个新颖的排放口，以避免夹带气体中的气体二次压缩。通过数值模拟揭示了新型三爪真空泵（TCVP）的工作过程和内部流场。还分析了拟议排放口的质量流量。研究结果表明，所提出的爪形转子具有外形简单、内容积比高、相对残留小等显着优点。设计的排出口实现了气体完全排出，无需对夹带中的气体进行二次压缩。揭示了压缩室分离形成的室中的部分气体在压缩过程中可以回流到吸入室。