Generation of high vacuums

Details Generation of high vacuums Generation of high vacuums

1979-07-20

1979-10-30

Bell, Houston S.

Fluent material handling, with receiver or receiver coacting mea

Processes

Gas or variation of gaseous condition in receiver

141 65, 73 492, B65B 6900, G01M 332

Patent

active

041724771

ABSTRACT:
In order to evacuate a receptacle using a pumping arrangement composed of a backing pump connected to the receptacle and a fine or high vacuum pump connected to the receptacle via a cold trap, the receptacle is initially evacuated only by operation of the backing pump, the time taken to achieve a predetermined initial pressure reduction in the receptacle only by the action of the backing pump is measured, then, on the basis of the magnitude of such pressure reduction and the measured time period, the subsequent time period which would be required, if the effect of condensable gases in the receptacle were ignored, to reach a predetermined second pressure, lower than the first pressure, in the operating range of the fine or high vacuum pump is calculated, and the receptacle is then evacuated by operation of the fine or high vacuum pump at the expiration of the subsequent time period.

REFERENCES:
patent: 2492075 (1949-12-01), Van Atta
patent: 3275221 (1966-09-01), Holce
patent: 3818752 (1974-06-01), Lindberg
Germany (Auslegeschrift) 1113283, 8/1961, Trendelenburg et al.
Germany (Offenlegungsschrift), 2015956, 10/1971, Reich.

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