Oxygen-enriched air supplier - comprises hollow mixing cylinder fed by cylinders and delivering mixt. through pneumatic valve

摘要

air supplier for use with oxygen tents in military field hospitals consists of a means of equalising the pressures of compressed air and O2, measuring and mixing variable ratios of them, and delivering the mixt. at a controlled rate by means of a pneumatic valve. The mixer is a hollow cylinder with two complementary radial half-rings of orifices, connected by circular distributors to the air and O2 supplies, resp. A semi-cylindrical core fits inside the cylinder and can be turned by a control knob to block half the orifices and allow gases from the other half - in the desired ratio of air:O2 to enter the delivery pipe to the valve and gas container. The appts. functions without electricity and provides a precisely-controllable supply.