Rotary expansible chamber devices – Multistage – Interengaging rotary members
Patent
1989-12-15
1990-07-24
Vrablik, John J.
Rotary expansible chamber devices
Multistage
Interengaging rotary members
418150, 418200, F04C 1818, F04C 2502
Patent
active
049432141
ABSTRACT:
A two-shaft rotary machine for use in a vacuum pump system includes rotors having a specific profile whereby any vibration and noise generated by the machine is minimized and its efficiency is increased. The number of lobes of each rotor is three or more. The tip and root portions of each rotor are defined by circular arcs, respectively, which are made smoothly continuous with each other through an involute curve. The ratio of the diameter of the tip circle to the diameter of the root circle is selected to fall within a range which is given by a specific expression.
REFERENCES:
patent: 1442018 (1923-01-01), Wendell
patent: 3089638 (1963-05-01), Rose
patent: 4210410 (1980-07-01), Ohtani
Kikuta Ritsuo
Niimura Yoshihiro
Usui Katsuaki
Ebara Corporation
Vrablik John J.
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