Screw type vacuum pump

Details Screw type vacuum pump Screw type vacuum pump

1985-02-13

1987-12-22

Croyle, Carlton R.

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

F04C 1816

Patent

active

047144181

ABSTRACT:
A screw vacuum pump including a plurality of casings and a pair of rotors defining a plurality of working chambers. The working chambers are constituted by working chambers whose volumes undergo a change as the rotors rotate, and working chambers whose volumes undergo substantially no change as the rotors rotate. The screw vacuum pump is capable of achieving pressure of 10.sup.-1 to 10.sup.-4 Torr or a low or medium vacuum by means of a single pump operating in a single stage.

REFERENCES:
patent: 1191423 (1916-07-01), Holdaway
patent: 2474653 (1949-06-01), Boestad
patent: 2931308 (1960-04-01), Luthi
patent: 3088659 (1963-05-01), Nilsson
patent: 3112869 (1963-12-01), Aschoff
patent: 3289600 (1966-12-01), Whitfield
patent: 3986801 (1976-10-01), Garland
patent: 4193749 (1980-03-01), Yamazaki
patent: 4412796 (1983-11-01), Bowman
European Search Report EP 85101569.3.

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