Comparing efficiency of the multi-lobe external compression pump rotors

The paper considers two-rotor vacuum pumps with rotors having different number of lobes. Coefficients of utilizing the working volume and the rotor mechanism channels conductivity are computed for the two-, three- and four-lobe rotors with an elliptical profile. The paper determines the profile parameters that provide best combination of these coefficients. Comparison of the obtained results shows that the four-lobe rotor profile provides less overflows than the two- and three-lobe profiles. However, due to a smaller radius of the casing bore with the same intercenter distance, it has the worst coefficient of volume utilization. The pump with the three-lobe rotor profile demonstrtates the highest efficiency in terms of speed of action and maximum degree of the increase in pressure.
EDN: NSXYOQ, https://elibrary/nsxyoq

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