Air-oxygen mixture controllers for breathing demand regulators
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United States of America Patent
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-
Oct 24, 1995
Grant Date -
N/A
app pub date -
Nov 22, 1993
filing date -
Nov 26, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Air-oxygen mixture control apparatus includes a pressure control valve arrangement for substantially equalizing the pressures of oxygen and air supplied to the apparatus at variable pressures. A volume flow control arrangement produces volume flows of oxygen and air appropriate for mixing to provide gas of desired oxygen concentration to a breathing demand regulator for breathing by an aircraft aircrew member. An aneroid acts to occlude the supply of air when the aircrew member is exposed to low aircraft ambient atmospheric pressure so that undiluted oxygen is made available for breathing. The apparatus overcomes the problem of mixing oxygen with air when either one or both is supplied from a variable pressure source, such as is the case when high pressure air from a compressor stage of a gas turbine engine is used for dilution purposes.
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