Pumping apparatus for pumping a gas by means of an oil-sealed va

Details Pumping apparatus for pumping a gas by means of an oil-sealed va Pumping apparatus for pumping a gas by means of an oil-sealed va

1991-08-28

1993-01-26

Vrablik, John J.

Measuring and testing

With fluid pressure

Leakage

417 87, 417205, 418 87, 418 88, 418 96, 418 97, 418100, G01M 304, F04B 2312, F04C 2702, F04C 2910

Patent

active

051814145

ABSTRACT:
A pumping apparatus for pumping a gas having application to helium leak detectors has a vane and oil-seal type vacuum pump immersed in a closed tank (9) partially filled with oil (10). The apparatus also includes an oil pump (20) for renewing the oil seal located inside the tank. The oil pump is equipped with a noise-reducing mixing device enabling the oil for constituting the oil seal to be mixed with a noise-reducing gas. The noise-reducing gas is fed from the outside of the tank to the mixing device by means of a pipe (24) passing through the wall of the tank and opening via a Venturi tube to the suction duct of the immersed oil pump.

REFERENCES:
patent: 3707339 (1972-12-01), Budgen
patent: 4283167 (1981-08-01), Bassan et al.

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