Mixer and doser cone assembly
AssigneeFaurecia Emissions Control Technologies, USA, LLC
InventorsEduardo Alano, Philip M. Dimpelfeld
Life of this patent
Estimating the term…
Abstract
A vehicle exhaust system includes an exhaust component defining an engine exhaust gas passageway and which includes an opening. A doser defines a doser axis and extends to a doser tip that is configured to spray a reducing agent into the engine exhaust gas passageway through the opening. A cone has a base end positioned adjacent the opening such that an annular gap is formed within the exhaust component around the doser tip. Exhaust gas is directed into the base end of the cone through the annular gap in a direction transverse to the doser axis. This configuration reduces deposit formation while still allowing the reducing agent to be thoroughly mixed with engine exhaust gases prior to introduction of the mixture into a downstream exhaust component.
Claims17
A reducing agent mixer for use with a vehicle exhaust system, the reducing agent mixer comprising
- a mixer body that defines an engine exhaust gas passageway adapted to house mixing of exhaust gas and reducing agent when exhaust gas moves through the mixer body,
- a doser arranged outside the mixer body and configured to discharge the reducing agent into the engine exhaust gas passageway along a doser axis, and
- a reducing agent delivery sub-assembly coupled to the doser and configured to conduct the reducing agent from the doser to the engine exhaust gas passageway and the reducing agent delivery sub-assembly including a plate formed to define an opening aligned with the doser axis, a cone arranged to be spaced apart from the plate along the doser axis to define an annular gap between the plate and the cone, and a cylindrical housing coupled to the plate and arranged around the cone to define a housing passageway that is fluidly connected with the engine exhaust gas passageway and the annular gap,
- wherein the cylindrical housing is formed to include a plurality of inlet slots that are circumferentially spaced apart from one another so that exhaust gas is directed from the engine exhaust gas passageway through the housing passageway and the annular gap into the cone in a distributed manner about the doser axis during use of the reducing agent mixer, and wherein the cone includes a base end located toward the plate and a distal end that is spaced apart from the base end and the plate along the doser axis and the plurality of inlet slots formed in the cylindrical housing are axially spaced apart from the base end and the distal end of the cone along the dose axis.
A reducing agent delivery sub-assembly for use with a vehicle exhaust system, the reducing agent delivery sub-assembly comprising
- a plate formed to define an opening,
- a cone extending along an axis that extends through the opening in the plate, the cone having a base end and a distal end, the base end of the cone being spaced apart from the plate to define an annular gap around the opening, and
- a cylindrical housing coupled to the plate and arranged around the cone to define a housing passageway between the cylindrical housing and the cone, the housing passageway fluidly connected with the annular gap, and the cylindrical housing formed to include at least one inlet opening arranged to direct exhaust gas from the housing passageway into the base end of the cone through the annular gap in a direction transverse to the doser axis, the at least one inlet opening configured such that all exhaust gas in the housing passageway is directed into the base end of the cone during use of the reducing agent delivery sub-assembly, wherein the at least one inlet opening formed in the cylindrical housing is spaced apart axially from the base end and the distal end of the cone.
A reducing agent mixer for use with a vehicle exhaust system, the reducing agent mixer comprising
- a mixer body that defines an engine exhaust gas passageway adapted to house mixing of exhaust gas and reducing agent when exhaust gas moves through the mixer body,
- a doser arranged outside the mixer body and configured to discharge the reducing agent into the engine exhaust gas passageway along a doser axis, and
- a reducing agent delivery sub-assembly coupled to the doser and configured to conduct the reducing agent from the doser to the engine exhaust gas passageway and the reducing agent delivery sub-assembly including a plate formed to define an opening aligned with the doser axis, a cone arranged to be spaced apart from the plate along the doser axis to define an annular gap between the plate and the cone, and a cylindrical housing coupled to the plate and arranged around the cone to define a housing passageway that is fluidly connected with the engine exhaust gas passageway and the annular gap,
- wherein the annular gap is arranged inside the engine exhaust gas passageway defined by the mixer body, and
- wherein the cylindrical housing is formed to include a plurality of inlet slots that are circumferentially spaced apart from one another so that exhaust gas is directed from the engine exhaust gas passageway through the housing passageway and the annular gap into the cone in a distributed manner about the doser axis during use of the reducing agent mixer.
Dependencies are inferred from the claim text.