标题：Design methodology of a new smooth rotor profile of the screw vacuum pump
作者：Wang, Jun ;Wei, Shuhong ;Sha, Rundong ;Liu, Hongjie ;Wang, Zengli
作者机构：[Wang, Jun ;Wei, Shuhong ;Sha, Rundong ;Liu, Hongjie ;Wang, Zengli ] College of Chemical Engineering, China University of Petroleum (East China), Qing 更多
摘要：The screw rotor and its cross-section profile primarily determine the performance and efficiency of the twin-screw vacuum pump (TSVP). However, the traditional cross-section profile (CSP) contains cusps or unsmooth points, so that screw rotor surfaces generated by this CSP contain unsmooth edges, which will lead to wear, deformation, and difficulty of coatings for corrosion protection in the unsmooth region. With the aim of solving this problem caused by cusps or unsmooth points of the CSP, we put forward a meshing model of a circular arc and an equidistant curve of an epicycloid (ECE), and then proposed a design methodology for generating a completely smooth CSP. Screw rotors generated by the proposed CSP were completely smooth, and the proposed screw rotors could correctly mesh. Moreover, a geometric model of the proposed CSP was established, and the influence of the geometric parameters on its shapes and characteristics were studied. In addition, the proposed screw rotor was compared with the traditional screw rotor in terms of stress and deformation. Results indicated that the proposed screw rotor had continuous meshing and contact lines, and small values of maximum stress and deformation. The proposed smooth screw rotor is superior to the traditional one.
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