Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1990-10-19
1992-06-09
Bertsch, Richard A.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
418202, 415 60, F04C 214, F04C 1814
Patent
active
051202085
ABSTRACT:
A molecular drag pump for delivering a gas under molecular flow conditions comprises a pair of parallel, helically threaded rotors rotatably mounted in a stationary housing. The rotors have respective helical threads and respective helical grooves, and are held in close mesh with each other. The helical threads are helically inclined in one direction to the axes of the rotors, and have a flank angle such that the helical threads are closely received in the respective helical grooves while keeping the threads out of contact with each other. The rotors are rotated in one direction about their respective axes to move a gas introduced through an inlet port toward an exhaust port axially along the rotors.
REFERENCES:
patent: 1991541 (1935-02-01), Cannizzaro
patent: 3170566 (1965-02-01), Zimmermann
patent: 3198582 (1985-08-01), Zalis
patent: 4782802 (1988-11-01), Koromilas
Patent Abstracts of Japan, vol. 13, No. 287 (M-844) (3635) Jun. 30, 1989 & JP-A-1 80786 (Hitachi) Mar. 27, 1989.
Patent Abstracts of Japan, vol. 12, No. 218 (M-711) (3065) Jun. 22, 1988 & JP-A-63 16185 (Mazda) Jan. 23, 1988.
Ogura Mitsuo
Toyoshima Takeshi
Bertsch Richard A.
Cavanaugh David L.
Hitachi Koki Company Limited
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