Mixer with integrated doser cone

Patent metadata

Field	Value
Publication number	US-9719397-B2
Application number	US-201514737546-A
Country	US
Kind code	B2
Filing date	Jun 12, 2015
Priority date	Apr 30, 2015
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A mixer for a vehicle exhaust system includes an outer housing having an upstream end and a downstream end. An upstream baffle has an inlet opening configured to receive exhaust gas and is mounted at the upstream end of the outer housing. A downstream baffle has an outlet opening configured to conduct exhaust gases to a downstream exhaust component and is mounted at the downstream end of the outer housing. A doser opening is formed within the outer housing at a location between the upstream and downstream baffles. A cone has a narrow end with an inlet opening and a wide end with an outlet opening. A tapered body portion extends from the narrow end to the wide end, with the cone being aligned with the doser opening. An extension portion extends outwardly from the wide end of the cone and provides a wall that surrounds the 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 arranged around a central axis to define an internal space and formed to define an opening that opens into the internal space, the internal space adapted to house mixing of exhaust gas and urea solution when exhaust gas moves along the central axis in a downstream direction through the mixer body,
a doser configured to discharge the urea solution through the opening of the mixer body into the internal space of the mixer body, and
a reducing agent delivery sub-assembly including an injection cone that conducts the urea solution 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 that receives a portion of the injection cone 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 to collect exhaust gas and to direct the exhaust gas into an inlet of the injection cone.

2. The reducing agent mixer of claim 1 , 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.

3. The reducing agent mixer of claim 2 , wherein the injection cone includes a tapered body that extends between a narrow end and a wide end and an extension wall that extends outward away from the wide end of the injection cone and 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.

4. The reducing agent mixer of claim 1 , wherein the injection cone includes a tapered body that extends between a narrow end and a wide end and an extension wall that extends outward away from the wide end of the injection cone and 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.

5. The reducing agent mixer of claim 4 , 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.

6. The reducing agent mixer of claim 5 , wherein the plurality of guide chambers further includes a third guide chamber formed to define an axially-upstream facing opening.

7. The reducing agent mixer of claim 4 , further comprising an upstream baffle including an upstream helical portion that extends circumferentially about the central axis between an upstream end and a downstream end thereof and an axially extending inlet wall that extends between and interconnects the upstream end and the downstream end of the upstream helical portion and the axially extending inlet wall is formed to include a primary inlet opening arranged to receive the exhaust gas moving into the internal space during use of the reducing agent mixer.

8. The reducing agent mixer of claim 7 , wherein the primary inlet opening is radially spaced apart from the central axis.

9. The reducing agent mixer of claim 4 , further comprising a downstream baffle including a downstream helical portion that extends circumferentially about the central axis and an axially extending outlet wall formed to include a primary outlet opening.

10. The reducing agent mixer of claim 1 , 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.

11. The reducing agent mixer of claim 1 , wherein the injection cone includes a tapered body that extends between a narrow end that defines the inlet of the injection cone and a wide end that defines an outlet of the injection cone, an extension wall that extends outward away from the wide end of the injection cone to surround the outlet, a curved transition portion that extends between the wide end and the extension wall to reduce build-up of the urea solution on the injection cone.

12. A reducing agent mixer for use with a vehicle exhaust system, the reducing agent mixer comprising
a mixer body arranged around a central axis to define an internal space and formed to define an opening that opens into the internal space,
a doser configured to discharge reducing agent through the opening of the mixer body 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 outward away from the wide end, the manifold includes 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.

13. The reducing agent mixer of claim 12 , wherein the guide chambers are in fluid communication with the internal space.

14. The reducing agent mixer of claim 13 , 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.

15. The reducing agent mixer of claim 14 , wherein the plurality of guide chambers further includes a third guide chamber formed to define an axially-upstream facing opening.

16. The reducing agent mixer of claim 12 , wherein the plurality of attachment arms includes a first attachment arm that extends axially upstream away from the interface portion and a second attachment arm that extends circumferentially away from the interface portion.

17. The reducing agent mixer of claim 16 , wherein the plurality of attachment arms further includes a third attachment arm that extends circumferentially away from the interface portion opposite the second attachment arm and turns away from the interface portion to extend axially upstream.

18. The reducing agent mixer of claim 16 , wherein the injection cone further includes a curved transition portion that extends between the wide end and the extension wall to reduce build-up of reducing agent on the injection cone.

19. The reducing agent mixer of claim 12 , further comprising an upstream baffle including an upstream helical portion that extends circumferentially about the central axis between an upstream end and a downstream end thereof and an axially extending inlet wall that extends between and interconnects the upstream end and the downstream end of the upstream helical portion and the axially extending inlet wall is formed to include a primary inlet opening.

20. The reducing agent mixer of claim 19 , further comprising a downstream baffle inclu

Assignees

• Faurecia Emissions Control Technologies Usa Llc
• Faurecia Emissions Control Technologies Usa Llc

Inventors

• Alano Eduardo
• McPeek Blake Lee

Classifications

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• F01N3/2892 Primary

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

• B01F3/04049

  Operations & Transport · mapped topic

• B01F5/0473

  Operations & Transport · mapped topic

• B01F5/0614

  Operations & Transport · mapped topic