Molecular drag type vacuum pump

Details Molecular drag type vacuum pump Molecular drag type vacuum pump

1992-12-03

1994-09-06

Look, Edward K.

Rotary kinetic fluid motors or pumps

Smooth runner surface for working fluid frictional contact

4174234, F01D 136

Patent

active

053442822

ABSTRACT:
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 the cylindrical element comprises a co-axial assembly of a plurality of individual discs, each disc being spaced apart from its adjacent disc(s), thereby defining the circumferential slots between the discs.

REFERENCES:
patent: 2910223 (1959-10-01), Schlumbohm
patent: 3628894 (1971-12-01), Ferguson, Jr.
Harris, Nigel S., Modern Vacuum Practice, 1989, pp. 146-151.

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