| 摘要 |
A dry roughing vacuum pump includes a valve (10; 15) with a through-passage arranged in the discharge line (9), the valve (10) with a through-passage being able to move between a closed position in which the valve (10; 15) with a through-passage is in contact with a seat of a mouth (12) of the discharge line (9) and an open position in which the valve with a through-passage is moved away from the mouth (12) of the discharge line (9), the vacuum pump including a motor gas injection device (13) that is configured to inject a motor gas into the inlet (11a) of the Venturi-effect passage (11). |
