爪式真空泵的新型直爪转子型线及其性能

爪式转子型线对爪式真空泵性能影响极大;针对现有直爪转子型线存在尖点,从而导致尖点处泄漏加剧和变形大的问题,提出一种新型直爪转子,研究爪式转子型线的几何理论;利用理论分析与数值计算,比较不同爪尖半径直爪转子的工作性能和力学性能,并分析不同直爪转子真空泵的混合过程,进而得到直爪转子最佳爪尖半径比的范围。结果表明:所提出的新型直爪转子改善了爪尖处的力学性能和密封性能;随着爪尖半径减小,爪式真空泵工作性能提高;适合的爪尖半径比ε为0.0571 4≤ε≤0.114 3。
Claw rotor profiles have a great influence on the performance of the claw vacuum pump. The straight claw rotor has cusps, which will result in serious gas leakage and deformation near the cusp. A novel profile of the straight claw rotor is proposed. Geometric theories of the straight claw rotor are also studied. By means of theoretical analysis and numerical simulation, the working performances and mechanical properties of the straight claw rotor with different circular arc radii in claw tip are compared, and the mixing process of the claw vacuum pump with different straight claw rotors is analyzed. The optimal range of arc radii in the claw tip of the straight claw rotor is obtained. The result indicates that the novel claw rotor improves mechanical properties and the sealing performance near the cusp. With the decrease of the claw cusp arc radius, the working performances of the claw vacuum pump are improved, and the optimal claw cusp arc radius ratio ε is in the range of 0.05714≤ε≤0.1143