| 摘要 |
The invention relates to a screw vacuum pump comprising two rotors (4, 5) which respectively have a hub (6, 7) and a thread (8, 9), additionally comprising a housing (2) wherein the rotors whose threads engage with each other are accommodated in such a way that they form, together with the housing, inlet cross sections (15, 16) on the inlet side thereof and form outlet cross sections (29) on the pressure side thereof causing gas to be conveyed from the inlet side to the pressure side during rotation of the rotors (4, 5). According to the invention, in order to improve inflow and outflow conditions, the rotors (4, 5) are provided on the inlet side with flow bodies (21, 22; 26, 27, 28; 36, 37) which are arranged upstream from the inlet cross sections (15, 16) in such a way that the inflow conditions of the gas to be transported to the inlet cross sections (15, 16) are improved.
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