Oil flow metering structure for oil sealed mechanical vacuum van

Details Oil flow metering structure for oil sealed mechanical vacuum van Oil flow metering structure for oil sealed mechanical vacuum van

1979-04-26

1981-06-30

Vrablik, John J.

Rotary expansible chamber devices

Multistage

Sliding vane

418 88, 418 98, 184 31, 415 90, 415 92, F04C 2502, F04C 2702, F04C 2902, F16N 2504

Patent

active

042760054

ABSTRACT:
A mechanical rotary vane vacuum pump has high and low vacuum stages for a pumped gas. Each stage includes a rotor for vanes cyclically driven about a common axis that is eccentric to a cylinder of a stator; the stator of each stage includes an inlet and outlet for the pumped gas. An oil seal between inlets and outlets for each stage is in a narrow gap between the stator and rotor. An interstage structure includes a flow path between the stages for the pumped gases and a shaft drivingly connected the rotors of the stages. An oil flow path comprises a first passage through the interstage structure leading radially to the shaft. The shaft includes diametrically opposed oil metering flats or cavities longitudinally aligned with an outlet of the first passage. A second passage through the interstage structure is longitudinally aligned with the cavities and leads tangentially from the peripheries of the shaft and a bore for the shaft. The second passage is in fluid flow relation with the cylinder of the low vacuum stage so oil metered by the cavities bursts into the second passage and flows to the cylinder of the low vacuum stage to form the oil seal and lubricate surfaces between the rotor and stator.

REFERENCES:
patent: 2246277 (1941-06-01), Davidson
patent: 2668655 (1954-02-01), Bowering
patent: 2877946 (1959-03-01), Garrison et al.
patent: 2902210 (1959-09-01), Power
patent: 3399826 (1968-09-01), Andriulis
patent: 4025242 (1977-05-01), Webb
Power, B. D. High Vacuum Pumping Equipment, 1966, Reinhold Publishing Corp., N. Y. pp. 12-18.

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