| 摘要 |
The invention relates to a vacuum pump comprising a housing (1), a mechanical portion (19) and a pumping portion (22). The pumping portion (22) includes two meshed helical rotors (A, B) each having a helical torsion about a longitudinal axis. The rotors (A, B) are short and held in an offset position in the downstream direction. An inlet passage (4) communicates with the inside of the housing (1) via an inlet opening (9). An outlet passage (5) communicates with the inside of the housing (1) via an outlet opening (11). The inlet and the outlet are axial relative to the axes of the helical rotors (I-I, II-II).
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