Patent ID: 7273187
Filing Date: 2007-09-25
Classification: B05B,F23D

Abstract:
1. A nozzle for air-assisted atomization of a liquid fuel, the nozzle comprising a housing and, within the housing: a fuel feed passage and an air feed passage; a swirling chamber arranged at a downstream end of the fuel and air feed passage, respectively; an exit orifice downstream of the swirling chamber through which a cone shaped spray of fuel may emerge out of a nozzle element; an air bypass passage for leading a fraction of the air flow in the air feed passage past the swirling chamber and to at least one air exit; wherein the housing forms an inner circumferential surface extending from the air exit to a far downstream end of the housing, the inner circumferential surface extending parallel to a longitudinal axis of the nozzle or being outwardly tapered from the air exit to said far downstream end of the housing; the exit orifice is arranged downstream of the air exit with the exit orifice being defined by a tubular projecting portion at a downstream surface of the nozzle element, whereby, during operation of the nozzle, air emerging through the air exit reduces depositing of residues of fuel on the downstream surface of the nozzle element.