Air-oxygen mixture controllers for breathing demand regulators

Details Air-oxygen mixture controllers for breathing demand regulators Air-oxygen mixture controllers for breathing demand regulators

1993-11-22

1995-10-24

Burr, Edgar S.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820511, 12820429, A62B 714

Patent

active

054601754

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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