Pumps – With muffler acting on pump fluid
Patent
1987-03-04
1988-08-30
Croyle, Carlton R.
Pumps
With muffler acting on pump fluid
417410, 418201, F04C 1816
Patent
active
047672846
ABSTRACT:
The present invention provides a screw vacuum pump unit in which both a screw block and a driving motor are mounted on one side surface of a casing of a speed change gear, both axes of a male rotor and a female rotor in the screw block are arranged in vertical adjacency within a substantially perpendicular virtual plane, and suction ports and discharge ports are arranged on both sides with the vertical plane intervening therebetween, whereby maintenance can be facilitated.
REFERENCES:
patent: 1844105 (1932-02-01), Schnell
patent: 2260237 (1941-10-01), Stahl
patent: 2474653 (1949-06-01), Boestad
patent: 2705922 (1955-04-01), Rathman
patent: 2849988 (1958-09-01), Nilsson
patent: 2935247 (1960-05-01), Trulsson
patent: 3388854 (1968-06-01), Olofsson
Hayakawa Tadashi
Mitsuhashi Shinji
Naya Koutarou
Shiinoki Kazuaki
Uchida Riichi
Croyle Carlton R.
Hitachi , Ltd.
Obee Jane E.
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