Constant mass oxygen addition independent of ambient pressure

摘要

A constant mass oxygen addition device for use with a re-breathing apparatus is disclosed for use by individuals venturing into harsh environments, particularly the underwater environment, that remains unaffected by ambient pressure changes. This constant mass oxygen addition device comprises an intermediate chamber which is first pressurized with regulated pressure gas containing oxygen to a set value greater than ambient pressure and then subsequently vented to ambient pressure. This defines one constant mass dosing cycle. Multiple constant mass dosing cycles are repeated sequentially on a periodic basis sufficient to replace metabolic oxygen used by the individual and can be controlled either electronically or preferentially independent of electronics and linked to the respiratory rate of the diver. If desired, adjustment of the delivered oxygen mass for each cycle is accomplished by mechanically adjusting the volume of the intermediate chamber or by altering the regulation pressure of the connected oxygen supply.