Patent ID: 11913366
Assignee: MARELLI EUROPE S.P.A.
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 20:
21. A heating device (6) for an exhaust system (1) of an internal combustion engine (2); the heating device (6) comprises:
a tubular body (12), where a combustion chamber (7) is obtained on the inside;
a fuel injector (9), which is mounted through a base wall (14) of the tubular body (12) so as to inject fuel into the combustion chamber (7);
at least one inlet opening (18), which can be connected to a fan (8) so as to receive an air flow, which is directed to the combustion chamber (7) and gets mixed with the fuel;
a feeding channel (21), which is entirely contained inside the tubular body (12), receives air from the inlet opening (18), surrounds an end portion of the fuel injector (9) and ends with a nozzle (22), which is arranged around a spray tip of the fuel injector (9); and
a spark plug (10), which is mounted through a side wall (16) of the tubular body (12) so as to trigger the combustion of a mixture of air and fuel;
wherein an axial distance (X), namely measured along a longitudinal axis (13) of the tubular body (12), between the spray tip of the fuel injector (9) and a longitudinal axis (30) of the spark plug (10) ranges from 33% to 100% of an inner diameter (D) of the tubular body (12);
wherein the feeding channel (21) is delimited, on the outside, by an outer tubular body (24) and is delimited, on the inside, by an inner tubular body (25), which surrounds the fuel injector (9) and contains, on the inside, the fuel injector (9); and
wherein the outer tubular body (24), at first, is separate from and independent of the tubular body (12) and is entirely contained in the tubular body (12).