Multistage rotary piston vacuum pump having sleeves to fix shaft

Details Multistage rotary piston vacuum pump having sleeves to fix shaft Multistage rotary piston vacuum pump having sleeves to fix shaft

1988-05-11

1991-01-08

Vrablik, John J.

Rotary expansible chamber devices

Multistage

Interengaging rotary members

418 83, 418 84, 418 94, 418152, 418179, 418206, F04C 2502, F04C 2904

Patent

active

049831070

ABSTRACT:
A twin-shaft vacuum pump includes a pump chamber, a pair of rotary pistons disposed in the pump chamber, and plates which laterally delimit the pump chamber, and a housing ring which peripherally delimits the pump chamber. In order to increase the ability of the pump to withstand thermal stresses, the housing ring and the rotary pistons are made of different materials, with the coefficient of expansion of the piston material being lower than the coefficient of expansion of the housing material. Other improvements include cooling of the lateral end plates, cooling of the rotors, and the provision of sleeves which serve to fix the position of the rotors on the shafts and which are composed of a material whose coefficient of expansion is lower than that of the rotor material.

REFERENCES:
patent: 901539 (1908-10-01), Leyner
patent: 1653814 (1927-12-01), Mild
patent: 2014932 (1935-09-01), Hallet
patent: 2367463 (1945-01-01), Heimbach
patent: 2708548 (1955-05-01), Blanton
patent: 2938664 (1960-05-01), Noller
patent: 3150593 (1964-09-01), Funk et al.
patent: 3237276 (1966-03-01), Ernst von der Ohe
patent: 4035112 (1977-07-01), Hackbarth et al.
patent: 4226574 (1980-10-01), Villette
patent: 4504201 (1985-03-01), Wycliffe
patent: 4648817 (1987-03-01), Mariani
patent: 4779578 (1988-10-01), Eiermann
von Gunter Leuschner, "Kleines Pumpenhandbuch fur Chemie und Technik", [Small Pump Manual for Chemistry and Technology], published by Verlag Chemie GmbH 1967, pp. 226-231.

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