| 摘要 |
A friction vacuum pump ( 10 ) comprises a housing ( 12 ) defining a vaneless pump stator ( 30 ), a rotor drive and a rotor support which rotatably supports a pump rotor ( 16 ) provided with a vane ( 18 ). The housing ( 12 ) surrounds the overall axial length of the pump rotor ( 16 ), the rotor drive and the rotor support. Prior art housings are of multipart configuration and thus comprise seals between the housing portions. The seals are difficult to coat and may be or become locations where leaks occur. In contrast, the housing ( 12 ) is of one-piece configuration such that, in any case, the region of the housing ( 12 ) which is in contact with the vacuum gas is free of seals.
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