Two-shaft type rotary machine having a tip circle diameter to sh

Details Two-shaft type rotary machine having a tip circle diameter to sh Two-shaft type rotary machine having a tip circle diameter to sh

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

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