Two stage dry primary pump

Details Two stage dry primary pump Two stage dry primary pump

1990-06-01

1991-08-20

Smith, Leonard E.

Pumps

Diverse pumps

Series

417251, 417310, 418 83, 415 90, F04B 300, F04B 2308, F04B 4900, F01C 2104

Patent

active

050409492

ABSTRACT:
A two stage dry primary pump comprises, in a single common stator: a screw pump at its low pressure end; and a fluid viscous effect, single rotary screw gas exhaust pump at its high pressure end; with a link duct providing communication between the screw pump and the viscous effect, single rotary screw gas exhaust pump. The invention is applicable to vacuum pumps.

REFERENCES:
patent: 2903248 (1959-09-01), Walker
patent: 3642384 (1972-02-01), Huse
patent: 4042310 (1977-08-01), Schibbye et al.
patent: 4090815 (1978-05-01), Nakamura
patent: 4770609 (1988-09-01), Uchida et al.
patent: 4781553 (1988-11-01), Nomura et al.
patent: 4797068 (1989-01-01), Hayakawa et al.

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