Oil-sealed vacuum pump

Details Oil-sealed vacuum pump Oil-sealed vacuum pump

1982-12-16

1985-06-25

Koczo, Michael

Rotary expansible chamber devices

Heat exchange or non-working fluid lubricating or sealing

With condition responsive control of non-working fluid

418 87, 418 88, 418 97, 417281, 417295, 417298, 417299, F01C 2104, F04C 2702, F04C 2502

Patent

active

045251290

ABSTRACT:
An oil-sealed vacuum pump comprises an oil circuit for supplying a pump chamber and bearings of the vacuum pump with oil. The oil circuit includes first and second branch conduits leading to the bearings and the pump chamber, respectively. The vacuum pump further has an oil pump coupled to the oil circuit for driving oil therethrough, a valve assembly coupled to the oil circuit for shutting off oil supply to the pump chamber during standstill of the vacuum pump, and a pressure reducer coupled to the oil circuit for reducing the oil pressure to environmental pressure. The first branch conduit leading to the bearings is situated upstream of, and the second branch conduit leading to the pump chamber and the valve assembly are situated downstream of the pressure reducer as viewed in the direction of oil flow in the oil circuit.

REFERENCES:
patent: 3406897 (1968-10-01), Diels
patent: 3463387 (1969-08-01), Pfaff et al.
patent: 3707339 (1972-12-01), Budgen
patent: 3811468 (1974-05-01), Bellmer
patent: 3838950 (1974-10-01), Andriulis
patent: 4120621 (1978-10-01), Pikul
patent: 4132289 (1979-01-01), Makela
patent: 4342547 (1982-08-01), Yamada et al.
patent: 4366834 (1983-01-01), Hanson et al.
patent: 4394113 (1983-07-01), Bammert
H. Wycliffe and B. D. Power, Pumped Oil Feed Systems for Rotary Vacuum Pumps, Apr. 1981, pp. 1160-1162.

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