Patent ID: 8789766

Claim:
A mixing device for an aircraft air conditioning system comprising a first supply conduit receiving and conveying fresh air from the air conditioning system situated in an unpressurized region of the aircraft, a second separate supply conduit receiving and conveying recirculated air from a pressurized region of the aircraft, a mixer ( 10 ) communicating with outlets of said respective first and second supply conduits and respectively receiving and mixing the fresh and recirculated air, a discharge conduit both receiving mixed air from the mixer ( 10 ) and supplying the mixed air into the pressurized region of the aircraft, and a gravity actuated non-return valve ( 12 ) integrally-arranged within the mixer ( 10 ), the mixer ( 10 ) being box-shaped and having front, back and two side walls, an opening through a first of said walls and communicating with said first supply conduit for receiving the fresh air, an opening through a second of said walls and communicating with said second separate supply conduit for receiving the recirculated air, an opening ( 14 ) through a third of said walls for discharging the mixed air, the non-return valve ( 12 ) integrally-arranged within the mixer ( 10 ) between all four walls, and the mixer ( 10 ) comprises pockets ( 20 ) arranged one above the other in flow cross-section, which have a free cross-section to deliver the fresh air from the air conditioning system into the discharge conduit for supplying mixed air into the pressurized region of the aircraft, and include a diagonal partition arranged to guide recirculated air from the pressurized region of the aircraft into the discharge conduit for supplying mixed air into the pressurized region of the aircraft.