Chemical and biological warfare filter injector mechanism

摘要

An injector mechanism uses breathing system gas to entrain cabin air to demist and defog the hood and visor (20) of an aircrew chemical ad biological warfare ("CBW") suit. The injector (14) includes a needle valve (40) for flow rate adjustment and an aneroid (34) for altitude compensation. The CBW filter (24) is downstream of the negative pressure produced by the injector to purify any ambient air drawn into the system at the negative pressure region. Positive pressure in the system downstream of the CBW filter (24) prevents inward leakage and contamination of the demist and defog gas stream.