Vacuum flow device

Details Vacuum flow device Vacuum flow device

1988-05-09

1989-01-24

Neils, Paul F.

Pumps

One fluid pumped by contact or entrainment with another

Jet pump with motive fluid generating pump

417 80, 417 89, 417158, 417181, 417196, 15402, 15409, F04B 2308, F04F 544, A47L 516

Patent

active

047998636

ABSTRACT:
A vacuum device comprising a by-pass fan pump, a conduit connecting the inlet of the pump to a member in which pressure is to be reduced and a flow passage formation enabling a stream of air to enter the pump and to by-pass the member. In a preferred embodiment the inlet to the by-pass fan pump is connected to the outlet of a Venturi pump and the member is connected to the exhaust inlet of the Venturi pump. The device is directed particularly to the replacement of air by preserving gases in the packaging of foodstuffs.

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patent: 3668736 (1972-06-01), Loscalzo
patent: 3778864 (1973-12-01), Scherer
patent: 3870070 (1975-03-01), Kraft
patent: 3943329 (1976-03-01), Hlavac
patent: 4361418 (1982-11-01), Tscheppe

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