Exhaust mixer for compact system

Patent metadata

Field	Value
Publication number	US-9714597-B2
Application number	US-201514958105-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Dec 3, 2015
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A mixer includes a plurality of blades extending along a longitudinal axis. The blades are arranged in a single row, and are axially spaced from each other along a transverse axis. Each of the blades defines a window. Each of the blades includes an upstream portion, and a downstream portion. Each of the blades includes a bend at the window that forms an interior blade angle between its respective upstream portion and its respective downstream portion. The single row of the blades is arranged to include a first group of blades and a second group of blades. The interior blade angle of each of the blades in the first group faces in a first axial direction along the transverse axis. The interior blade angle of each of the blades in the second group faces in a second axial direction along the transverse axis.

First claim

The invention claimed is:

1. A mixer for an exhaust gas treatment system of a vehicle, the mixer comprising:
a support body located in the exhaust gas treatment system and defining a rectangular mixing chamber defining a fluid flow path disposed along a longitudinal axis, wherein the mixing chamber includes a lower surface, an upper surface spaced from and opposing the lower surface, a first lateral edge surface extending between the lower surface and the upper surface, and a second lateral edge surface extending between the lower surface and the upper surface and opposing the first lateral edge surface;
a plurality of blades extending between the lower surface and the upper surface of the mixing chamber, and arranged in a single row axially spaced from each other along a transverse axis that is perpendicular to the longitudinal axis;
wherein each of the plurality of blades extends along the longitudinal axis from an upstream edge to a downstream edge;
wherein each of the plurality of blades defines a window having an upstream window edge and a downstream window edge spaced from the upstream window edge along the longitudinal axis, such that each of the plurality of blades includes an upstream portion disposed between its respective upstream edge and its respective upstream window edge, and a downstream portion disposed between its respective downstream window edge and its respective downstream edge; and
wherein each of the plurality of blades includes a bend forming an interior blade angle between its respective upstream portion and its respective downstream portion.

2. The mixer set forth in claim 1 wherein the interior blade angle of each of the plurality of blades is between approximately 90° and 130°.

3. The mixer set forth in claim 2 wherein the interior blade angle of each of the plurality of blades is approximately equal to 110°.

4. The mixer set forth in claim 1 wherein the upstream portion of each of the plurality of blades projects to form an upstream interior angle and a complimentary upstream exterior angle relative to the transverse axis, and wherein the upstream interior angle is an acute angle between approximately 45° and 65°.

5. The mixer set forth in claim 4 wherein the upstream interior angle of each of the plurality of blades is approximately equal to 55°.

6. The mixer set forth in claim 4 wherein the downstream portion of each of the plurality of blades projects to form a downstream interior angle and a complimentary downstream exterior angle relative to the transverse axis, and wherein the downstream interior angle is an acute angle between approximately 45° and 65°.

7. The mixer set forth in claim 6 wherein the downstream interior angle of each of the plurality of blades is approximately equal to 55°.

8. The mixer set forth in claim 6 wherein the upstream interior angle and the downstream interior angle are equal to each other.

9. The mixer set forth in claim 1 wherein the upstream portion of each of the plurality of blades defines an upstream length measured between its respective upstream edge and its respective upstream window edge, wherein the downstream portion of each of the plurality of blades defines a downstream length measured between its respective downstream window edge and its respective downstream edge, and wherein the upstream length is less than the downstream length.

10. The mixer set forth in claim 1 wherein the bend in each of the plurality of blades defines a circular arc having a radius between approximately 3.0 mm and 11.0 mm.

11. The mixer set forth in claim 10 wherein the radius of the bend in each of the plurality of blades is approximately equal to 7.25 mm.

12. The mixer set forth in claim 1 wherein each of the plurality of blades includes an upper bridge portion disposed adjacent the upper surface of the support body, and extending between its respective upstream portion and its respective downstream portion.

13. The mixer set forth in claim 12 wherein each of the plurality of blades includes a lower bridge portion disposed adjacent the lower surface of the support body, and extending between its respective upstream portion and its respective downstream portion.

14. The mixer set forth in claim 13 wherein the upper bridge portion and the lower bridge portion of each of the plurality of blades defines its respective bend.

15. The mixer set forth in claim 14 wherein a larger percentage of an area of the window of each respective blade of the plurality of blades is disposed between its respective bend and its respective downstream window edge, than is disposed between its respective upstream window wedge and its respective bend.

16. The mixer set forth in claim 1 wherein the single row of the plurality of blades are arranged to include a first group of blades and a second group of blades, with the interior blade angle of each of the plurality of blades in the first group of blades facing a first axial direction along the transverse axis, and the interior blade angle of each of the plurality of blades in the second group of blades facing a second axial direction along the transverse axis.

17. The mixer set forth in claim 16 wherein a quantity of the plurality of blades disposed in the first group of blades is equal to a quantity of the plurality of blades disposed in the second group of blades.

18. A fluid mixer for an exhaust gas treatment system of a vehicle comprising:
a support body located in the exhaust gas treatment system and defining a rectangular mixing cha for an exhaust gas treatment system defining a fluid flow path disposed along a longitudinal axis, wherein the mixing chamber includes a lower surface, an upper surface spaced from and opposing the lower surface, a first lateral edge surface extending between the lower surface and the upper surface, and a second lateral edge surface extending between the lower surface and the upper surface and opposing the first lateral edge surface;
a plurality of blades extending between the lower surface and the upper surface of the mixing chamber, and arranged in a single row axially spaced from each other along a transverse axis that is perpendicular to the longitudinal axis;
wherein each of the plurality of blades extends along the longitudinal axis from an upstream edge to a downstream edge;
wherein each of the plurality of blades defines a window having an upstream window edge and a downstream window edge spaced from the upstream window edge along the longitudinal axis, such that each of the plurality of blades includes an upstream portion disposed between its respective upstream edge and its respective upstream window edge, and a downstream portion disposed between its respective downstream window edge and its respective downstream edge;
wherein each of the plurality of blades includes an upper bridge portion disposed adjacent the upper surface of the support body, and extending between its respective upstream portion and its respective downstream portion;
wherein each of the plurality of blades includes a lower bridge portion disposed adjacent the lower surface of the support body, and extending between its respective upstream portion and its respective downstream portion, with the window disposed between the upper bridge portion and the lower bridge portion
wherein each of the plurality of blades includes a bend, defined by its respective upper bridge portion and its respective lower bridge portion, forming an interior blade angle between its respective upstream portion and its respective downstream portion; and wherein the single row of the p

Assignees

• Gm Global Tech Operations Llc

Inventors

• Mital Rahul
• Yadav Anil
• Li Jianwen
• Prabhakar Amit
• Ciaravino Claudio

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

• B01F5/0608

  Operations & Transport · mapped topic

• B01D53/9431

  Processes characterised by a specific device · CPC title

• B01F25/431974

  Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall · CPC title