| 摘要 |
A vacuum pump of the molecular drag type comprising a pump body, a cylindrical element adapted for rotation within the pump body about its longitudinal axis and having a plurality of circumferential slots defined in its surface which are substantially perpendicular to the longitudinal axis, a stator element held stationary with regard to the pump body and having projections extending into the slots substantially to fill the slots in the vicinity of the stator, wherein at least some of the surfaces of the stator projections adjacent the walls of the slots are coated with an abradable material.
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