| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid-sealed vacuum pump capable of further improving the pump efficiency while directly connecting a discharge pipe to a discharge chamber. SOLUTION: In the liquid-sealed vacuum pump, a rotor chamber composed of a main body casing in which an impeller rotating about an eccentric axis is received and the discharge chamber arranged adjacently to the rotor chamber are separated by a port plate having a main discharge port and a plurality of auxiliary discharge ports with check valves, and the discharge pipe is connected to the discharge chamber. The upper and lower ends of a connecting position of the discharge pipe with respect to the discharge chamber are set to correspond in height to part of the main discharge port and part of at least one of the auxiliary discharge ports. COPYRIGHT: (C)2009,JPO&INPIT
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