Patent ID: 8047903
Filing Date: 2011-11-01
Classification: B64D,Y02T

Abstract:
1. In an aircraft having a cabin with an internal pressure and an engine that produces compressed engine air, an emergency pressurization system for pressurizing the aircraft should said internal pressure fall below a threshold pressure, said system comprising: a regulator that receives said compressed engine air from said engine, said regulator passing a first output flow of compressed air only if said internal pressure fall below said threshold pressure, wherein said first output flow has a flow rate proportional to a pressure difference between said internal pressure and said threshold pressure; a limiting valve controlled by said first output flow of said regulator, said limiting valve receiving said compressed engine air from said engine and passing a second output flow of compressed air, wherein said second output flow is governed by said first output flow received from said regulator; and an air pump powered by said second output flow, wherein said air pump draws ambient fresh air from outside the aircraft, compresses the fresh air to a predetermined pressure and pumps compressed fresh air into the cabin of the aircraft, therein raising said internal pressure without contaminating the fresh air with the compressed engine air.