Multi-stage screw vacuum pump

Details Multi-stage screw vacuum pump Multi-stage screw vacuum pump

1993-07-07

1995-01-03

Bertsch, Richard A.

Rotary expansible chamber devices

Multistage

Interengaging rotary members

418202, 184 131, F01C 130

Patent

active

053781287

ABSTRACT:
A multi-stage screw vacuum pump having a reduced number of constituent parts as compared with the conventional one and a reduced overall size. The multi-stage screw vacuum pump comprises an input mechanism for transmitting a driving force derived from a driving source to a former-stage pump, and speed up mechanisms for speeding up the rotation of the former-stage pump for transmission to a latter-stage pump.

REFERENCES:
patent: 2691482 (1954-10-01), Ungar
patent: 2937807 (1960-05-01), Lorenz
patent: 2981373 (1961-04-01), Van Raust
patent: 3407996 (1968-10-01), Olofsson et al.
patent: 4068984 (1978-01-01), Spindler
patent: 4076468 (1978-02-01), Persson et al.
Patent Abstracts of Japan, vol. 11, No. 78 (M-570), Mar. 10, 1987, JP-A-61 234 290, Oct. 18, 1986.

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