Molecular drag pump

Details Molecular drag pump Molecular drag pump

1996-06-27

1998-03-03

Izaguirre, Ismael

Pumps

Motor driven

Electric or magnetic motor

415 90, F04D 1904

Patent

active

057228191

ABSTRACT:
A molecular drag pump comprising a rotor and a stator, the pump being of the type including at least alternating finned stages of the rotor and of the stator, and in which the rotor is bell-shaped, while the stator includes at least one external portion carrying the stator fins and at least one internal portion penetrating into the bell-shaped rotor, said internal portion closing the pump at its delivery end and including a flange-forming external peripheral rim, wherein said external portion of the stator carrying the stator pins is made up of two half-stators that meet in a diametral plane, each half-stator comprising a single piece and being positioned axially by having a bearing surface situated at its end remote from its suction end that hooks into a complementary circular groove of said internal portion of the stator, and wherein the outside diameter of the first finned stage of the rotor at its suction end corresponds, ignoring operating clearance, to the outside diameter of the external portion of the stator.

REFERENCES:
patent: 4808067 (1989-02-01), Saulgeot
patent: 5501583 (1996-03-01), Nagaoka et al.
patent: 5536148 (1996-07-01), Nishiuchi et al.
patent: 5664935 (1997-09-01), Nishiuchi et al.

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