Mixer with integrated doser cone

Patent metadata

Field	Value
Publication number	US-9714598-B2
Application number	US-201615132473-A
Country	US
Kind code	B2
Filing date	Apr 19, 2016
Priority date	Apr 30, 2015
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A mixer for a vehicle exhaust system includes a mixer housing defining a mixer central axis and having an inlet at an upstream end and an outlet at a downstream end. An upstream baffle is in the housing at the upstream end and includes at least one inlet opening configured to receive engine exhaust gas. A downstream baffle is in the mixer housing at the downstream end such that the downstream baffle is axially spaced from the upstream baffle. The downstream baffle includes at least one outlet opening. A housing opening is formed within the mixer housing at a location between the upstream and downstream baffles, and which is configured to receive a doser. A cone has a cone outlet opening aligned with the housing opening, and an extension portion extends outwardly from a wide end of the cone to provide a wall that surrounds the cone outlet opening.

First claim

The invention claimed is:

1. A reducing agent mixer for use with a vehicle exhaust system, the reducing agent mixer comprising
a mixer body having a side wall arranged around a central axis to define an internal space adapted to house mixing of exhaust gas and reducing agent when the exhaust gas moves in a downstream direction through the mixer body, an upstream baffle including an upstream helical portion that extends circumferentially about and axially along the central axis and an axially extending inlet wall formed to include at least one primary inlet opening, and a downstream baffle formed to define a primary outlet opening and including a first downstream flat portion, a second downstream flat portion, and a downstream helical portion that extends circumferentially about the central axis and interconnects the first downstream flat portion and the second downstream flat portion,
a doser configured to discharge the reducing agent through an opening of the side wall into the internal space of the mixer body, and
a reducing agent delivery sub-assembly including an injection cone and a manifold, the injection cone having a tapered body that extends between a narrow end and a wide end thereof and an extension wall that extends outwardly away from the wide end, the manifold including an interface portion formed to define a cone-receiving cavity that receives the narrow end of the injection cone and a plurality of attachment arms coupled to the interface portion, the attachment arms formed to define a plurality of guide channels fluidly connected with the cone-receiving cavity, and the extension wall of the injection cone cooperates with the attachment arms to close the plurality of guide channels to define a plurality of guide chambers.

2. The reducing agent mixer of claim 1 , further including an extension baffle including a flat extension plate arranged to be generally perpendicular to the central axis, a circumferential wall that extends axially away from the flat extension plate toward the upstream baffle and circumferentially partway about the central axis, and an axially extending side wall coupled to the flat extension plate and the circumferential wall, the downstream baffle, flat extension plate, circumferential wall, and the axially extending side wall of the extension baffle cooperate to define a primary extension inlet opening aligned with the primary outlet opening of the downstream baffle, and the axially extending side wall of the extension baffle is formed to include a primary extension outlet opening.

3. The reducing agent mixer of claim 2 , wherein the flat extension plate defines an apex and includes a first edge that extends radially outward away from the apex toward the side wall of the extension baffle and a second edge that extends radially outward from the apex toward the side wall of the extension baffle and the second edge is circumferentially spaced apart from the first edge by between about 90 degrees and about 180 degrees relative to the central axis.

4. The reducing agent mixer of claim 2 , wherein the plurality of attachment arms includes a first attachment arm that extends axially upstream away from the interface portion, a second attachment arm that extends circumferentially away from the interface portion, and a third attachment arm that extends circumferentially away from the interface portion opposite the second attachment arm and that turns away from the interface portion to extend axially upstream.

5. The reducing agent mixer of claim 1 , wherein the at least one primary inlet opening is radially spaced apart from the central axis.

6. The reducing agent mixer of claim 1 , wherein the upstream baffle further includes a first upstream flat portion that is generally perpendicular to the central axis and a second upstream flat portion that is generally perpendicular to the central axis, the second upstream flat portion is spaced apart axially from the first upstream flat portion, and the first upstream flat portion extends circumferentially about 180 degrees around the central axis.

7. The reducing agent mixer of claim 1 , wherein the plurality of guide chambers includes a first guide chamber formed to define an axially-upstream facing opening and a second guide chamber formed to define a circumferentially facing opening.

8. The reducing agent mixer of claim 7 , wherein the plurality of guide chambers further includes a third guide chamber formed to define an axially-upstream facing opening.

9. The reducing agent mixer of claim 7 , wherein the extension wall of the injection cone extends axially downstream to the first downstream flat portion of the downstream baffle.

10. A reducing agent mixer for use with a vehicle exhaust system, the reducing agent mixer comprising
a mixer body having a side wall arranged around a central axis to define an internal space and formed to define an opening that opens into the internal space, an upstream baffle having an upstream helical portion that extends circumferentially about the central axis and axially along the central axis, and a downstream baffle axially spaced apart from the upstream baffle and including a first downstream flat portion, a second downstream flat portion axially space apart from the first downstream flat portion, and a downstream helical portion that interconnects the first downstream flat portion and the second downstream flat portion, and the downstream baffle formed to define a primary outlet opening located axially between the first downstream flat portion and the second downstream flat portion,
a doser configured to discharge reducing agent through the opening of the side wall, and
a reducing agent delivery sub-assembly including an injection cone that conducts the reducing agent discharged from the doser into the internal space of the mixer body and a manifold that includes an interface portion formed to define a cone-receiving cavity and a plurality of attachment arms that define a plurality of inwardly-opening guide channels fluidly connected with one another and the cone-receiving cavity.

11. The reducing agent mixer of claim 10 , wherein the injection cone includes a tapered body that extends between a narrow end and a wide end and an extension wall that extends outwardly away from the wide end, the extension wall is arranged to close the plurality of inwardly-opening guide channels to define a plurality of guide chambers that are in fluid communication with the internal space, and the extension wall of the injection cone extends axially downstream to the first downstream flat portion of the downstream baffle.

12. The reducing agent mixer of claim 11 , wherein the plurality of guide chambers includes a first guide chamber formed to define an axially-upstream facing opening and a second guide chamber formed to define a circumferentially facing opening.

13. The reducing agent mixer of claim 12 , wherein the plurality of guide chambers further includes a third guide chamber formed to define an axially-upstream facing opening.

14. The reducing agent mixer of claim 10 , wherein the manifold includes an inner surface and an outer surface spaced apart radially from the inner surface to locate the inner surface radially between the outer surface and the central axis and the inner surface is formed to define the plurality of attachment arms.

15. The reducing agent mixer of claim 10 , wherein the upstream baffle further includes a first upstream flat portion and an axially extending inlet wall that extends between and interconnects the first upstream flat portion and the upstream helical portion and the axially extending inlet wall is formed

Assignees

• Faurecia Emissions Control Technologies Usa Llc

Inventors

• Alano Eduardo
• McPeek Blake Lee

Classifications

• B01F3/04049

  Operations & Transport · mapped topic

• B01F5/0614

  Operations & Transport · mapped topic

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• F01N3/208

  Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title

• F01N3/2892 Primary

  Exhaust flow directors or the like, e.g. upstream of catalytic device · CPC title