Gas friction pump having an outlet-side helical stage

Details Gas friction pump having an outlet-side helical stage Gas friction pump having an outlet-side helical stage

1990-07-19

1991-09-24

Look, Edward K.

Rotary kinetic fluid motors or pumps

Smooth runner surface for working fluid frictional contact

415914, 417366, F01D 100

Patent

active

050510606

ABSTRACT:
A gas friction pump has an inlet arranged to be coupled to a vessel to be evacuated; an outlet and an outlet-side pumping stage formed of a helical gas pumping channel. The pump further has a scavenging gas inlet circumferentially surrounding the helical gas pumping channel for exposing the channel to a scavenging gas.

REFERENCES:
patent: 4273263 (1981-06-01), Voegele et al.
patent: 4734018 (1988-03-01), Taniyama et al.
patent: 4806074 (1989-02-01), Burger et al.

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