Cooling structure for an oil sealed rotary vacuum pump

Details Cooling structure for an oil sealed rotary vacuum pump Cooling structure for an oil sealed rotary vacuum pump

1979-04-26

1981-08-11

Vrablik, John J.

Rotary expansible chamber devices

Multistage

Sliding vane

418 85, 418 96, 418 98, 418101, F04C 2502, F04C 2702, F04C 2902, F04C 2904

Patent

active

042831679

ABSTRACT:
An oil pool in a rotary vane, oil sealed mechanical vacuum pump casing is cooled by air drawn by a relatively low pressure and low speed laminar flow fan mounted on a motor shaft for the pump and positioned in a shroud between end plates for the motor and casing. The air pumped by the fan flows axially relative to the shaft through a horizotally extending slot at the bottom of the shroud and vertically extending slots on the sides of the shroud. The pumped air flows against vertically and horizontally extending fins respectively on the pump casing bottom and sides. The vertically extending fins at the bottom of the casing have bases slightly above the horizontal slot at the bottom of the housing so air flowing through that slot flows against the bases of the fins at a shallow angle. A vertical surface of the housing remote from the fan and the shroud has vertically extending fins that are aligned with the vertically extending fins on the bottom of the casing.

REFERENCES:
patent: 1725390 (1929-08-01), Brouse
patent: 2496676 (1950-02-01), Rawson
patent: 2876948 (1959-03-01), Hockel et al.
patent: 3180569 (1965-04-01), Bielefeld
patent: 3193192 (1965-07-01), Carter, Jr.
Power, B. D., High Vacuum Pumping Equipment, 1966, Reinhold Publishing Corp., N. Y., pp. 12 and 18.

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