Rotary expansible chamber devices – Multistage – Interengaging rotary members
Patent
1989-08-31
1991-02-26
Koczo, Michael
Rotary expansible chamber devices
Multistage
Interengaging rotary members
418 86, 418 15, F04C 2300, F04C 2502, F04C 2904
Patent
active
049957961
ABSTRACT:
A multi-section Roots vacuum pump of the reverse-flow cooling type having a plurality of pump sections each having rotors fixed to two common shafts. The pump includes a housing in each of the pump sections having an inlet and an outlet for a gas to be pumped and enclosing the rotors, a peripheral gas passages arranged around the housing, and a peripheral coolant water passages arraged around the peripheral gas passages. The gas flowing through the inlet into the housing and delivered through the outlet is supplied to the peripheral gas passages to be cooled there, and at least a portion of the cooled gas is returned into the housing. The remaining portions of the gas which are not returned into the housing in the pump sections except for the last pump section are supplied to the inlet of the next pump section through the peripheral gas passage.
REFERENCES:
patent: 2489887 (1949-11-01), Houghton
patent: 2648488 (1953-08-01), Paget
patent: 3405604 (1968-10-01), Lysholm
patent: 3667874 (1972-06-01), Weatherston et al.
patent: 3922117 (1975-11-01), Weatherston
patent: 4102615 (1978-07-01), Irgens
patent: 4789314 (1988-12-01), Higuchi et al.
Higuchi Tutomu
Kambe Shigeharu
Koczo Michael
Unozawa - Gumi Iron Works, Ltd.
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