Abstract
The claw rotor profile is one of the key factors for improving the performance of claw vacuum pumps. In order to develop novel types of claw rotor profiles, the conjugate curves of claw rotor profiles were calculated, and therefore two types of straight claw rotors, a cusp claw rotor and a smooth claw rotor, were proposed in this study. Geometric models of the proposed claw rotors were established, and profile equations were also derived. Moreover, effects of the independent geometric parameters on shapes of the claw rotors and the performance of pumps were analyzed. The stress and deformation of two proposed claw rotors loaded by gas pressures at the end moment of the discharge process were analyzed and compared. The study results indicate that the cusp claw rotor is a special case of the smooth claw rotors, when the value of tip circular arcs equals to zero. The smooth claw rotor is superior to the cusp claw rotor in terms of the working performance and mechanical property.
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