High efficiency aspirator for inflatable emergency slides

A nozzle assembly for use in an aspirator assembly for inflating inflatable emergency evacuation devices, the aspirator assembly having a proximal end including an ambient air inlet port and a check valve, a mixing chamber, and a distal end having an outlet port, the mixing chamber defining a gas flow path between the inlet port and the outlet port, said nozzle assembly having a longitudinal axis and comprising:

• a primary gas inlet port;
• and
• a ring member comprising an outer ring and an inner ring, said rings being of circular shape and disposed concentric with each other in a first plane extending perpendicularly to said longitudinal axis, said rings having internal passageways in fluid communication with said primary gas inlet port for receipt of a pressurized primary gas therein, said passageways being in fluid communication with plural nozzle jets projecting outward from said rings, with each of said jets being a tubular member extending in a first direction parallel to said longitudinal axis and perpendicular to said first plane, each of said plural nozzle jets having an open free end, said open free ends being coplanar in a second plane parallel to said first plane, each of said rings including section of a generally symmetrical cambered top and bottom airfoil shape cross section comprising a rounded leading end and a tapering trailing end, said leading end being directed in a second direction opposite to said first direction, said trailing end being directed in said first direction, said nozzle assembly being configured whereupon when a pressurized primary gas is introduced into said primary gas inlet port the pressurized primary gas flows through said internal passageways to said nozzle jets from which it exits said open free ends to create a venturi effect and partial vacuum adjacent said nozzle jets.