Rotary vane vacuum pump with filter means for inlet

Details Rotary vane vacuum pump with filter means for inlet Rotary vane vacuum pump with filter means for inlet

1977-06-13

1979-08-14

Vrablik, John J.

Rotary expansible chamber devices

With removal or accommodation of solid foreign material in...

With filter

418 97, 55467, 55482, 55525, F04C 2902, B01D 2700, B01D 3500, B01D 5000

Patent

active

041643844

ABSTRACT:
An improved design of a rotary vane-type vacuum pump which prevents the oil used to lubricate the moving parts of the pump from entering the intake line of a connected vacuum chamber. The improvement comprises forming the inlet port in the front face of the cover plate which seals the end of the rotor casing. Filters are positioned in the intake port to catch any oil flowing along the inner wall of the intake port and to condense any oil foam entering therein. In order to facilitate the condensing of the oil foam, the inlet port is divided into two connected chambers, the lower of said chambers being of sufficient capacity to collect said oil foam flowing from the pump during its operation. A check valve is also positioned in the inlet port ahead of said filters in order to prevent the vacuum pressure in the vacuum chamber and intake line from dissipating through the pump and oil mist being drawn into the intake port when the pump is stopped.

REFERENCES:
patent: 1769153 (1930-07-01), Meyer
patent: 1879136 (1932-09-01), Dubrovin
patent: 2685776 (1954-08-01), Oishei et al.
patent: 3525578 (1970-08-01), Le Blanc
patent: 3711228 (1973-01-01), Foley
Mechanical Pumps, Fittings, and Accessories, Dresser Vacuum Catalogue No. 200-1, 1963, p. 4.

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