Methods and apparatus for controlling gas flows

Details Methods and apparatus for controlling gas flows Methods and apparatus for controlling gas flows

Filed on

1979-07-05

Date issued

1980-09-23

Examiner

Schwartz, Larry I.

Patent Class

Drying and gas or vapor contact with solids

SubClass

Apparatus

SubSubClass

With means to treat gas or vapor

Other Related Categories

34 23, 34 34, 34 36, 34 54, 34 4, 34 41, 137 93, 250453, 4273984, 118 50, F26B 328

Type

Patent

Status

active

Patent number

042234506

Description

ABSTRACT:
A chamber is isolated from ambient atmosphere by supplying a flow of inert gas to the entrance and/or exit of the chamber such as an oven for curing solvent borne resin coatings on a material passed therethrough. The inert gas is supplied at a substantially constant mass flow rate through an orifice which may be adjusted in opening or direction so as to enable the momentum of discharged inert gas to be controlled. A flow of gas is exhausted exteriorly of but in the vicinity of the chamber exit or entrance and the oxygen content of such flow is sensed. The sensed oxygen value is compared with a predetermined value and the difference is utilized to adjust the orifice to either increase or decrease the momentum of inert gas discharged therefrom. In this manner atmospheric oxygen is precluded from entering the chamber while only the amount (flow) of inert gas necessary to block such oxygen is utilized thereby minimizing the loss of inert gas from the chamber to ambient.

REFERENCES:
patent: 2743529 (1956-05-01), Hayes
patent: 3465753 (1969-09-01), Levy et al.
patent: 3654459 (1972-04-01), Coleman
patent: 3676673 (1972-07-01), Coleman
patent: 3790801 (1974-02-01), Coleman
patent: 3936950 (1976-02-01), Troue
patent: 4118873 (1978-10-01), Rothchild
patent: 4143468 (1979-03-01), Novotny
patent: 4150494 (1979-04-01), Rothchild
patent: 4150670 (1979-04-01), Jewett et al.

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