Mixer Assembly For Exhaust Aftertreatment System

Patent metadata

Field	Value
Publication number	US-2016348557-A1
Application number	US-201514722762-A
Country	US
Kind code	A1
Filing date	May 27, 2015
Priority date	May 27, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

An exhaust aftertreatment system may include an injector, an aftertreatment device and a mixer assembly. The injector may be configured to inject a fluid into an exhaust passageway that receives exhaust gas from a combustion engine. The aftertreatment device may be disposed in the exhaust passageway downstream of the injector. The mixer assembly may be disposed in the exhaust passageway upstream of the aftertreatment device and may include a first stage having a plurality of parallel plates and a second stage connected to the first stage and disposed downstream of the first stage. The second stage may include an auger blade. The mixer assembly may divide an exhaust stream into at least two flow paths.

First claim

What is claimed is:

1 . An exhaust aftertreatment system comprising:
an injector configured to inject a fluid into an exhaust passageway that receives exhaust gas from a combustion engine; an aftertreatment device disposed in the exhaust passageway downstream of the injector; and a mixer assembly disposed in the exhaust passageway upstream of the aftertreatment device and including a first stage having a plurality of parallel plates and a second stage connected to the first stage and disposed downstream of the first stage, the second stage including an auger blade, the mixer assembly dividing an exhaust stream into at least two flow paths.

2 . The exhaust aftertreatment system of claim 1 , wherein one of the parallel plates and the auger blade cooperate to form a monolithic body.

3 . The exhaust aftertreatment system of claim 1 , wherein the second stage includes another auger blade.

4 . The exhaust aftertreatment system of claim 3 , wherein the auger blades extend in different rotational directions.

5 . The exhaust aftertreatment system of claim 4 , wherein an axis of rotation of at least one of the auger blades is offset from a longitudinal axis of a pipe in which the first stage is disposed.

6 . The exhaust aftertreatment system of claim 5 , wherein the auger blades have different pitches.

7 . The exhaust aftertreatment system of claim 1 , wherein the plurality of parallel plates are at least partially disposed within an annular housing.

8 . The exhaust aftertreatment system of claim 7 , wherein the auger blade has a larger outer diameter than an outer diameter of the annular housing.

9 . The exhaust aftertreatment system of claim 7 , wherein the auger blade has an outer diameter that is equal to an outer diameter of the annular housing.

10 . The exhaust aftertreatment system of claim 7 , wherein first and second axial ends of the annular housing are angled at a non-perpendicular angle relative to a longitudinal axis of the annular housing.

11 . The exhaust aftertreatment system of claim 1 , wherein the second stage includes a deflector plate that is angled away from the auger blade.

12 . The exhaust aftertreatment system of claim 11 , wherein the second stage defines at least three flow paths, the deflector plate defining first and second ones of the at least three flow paths, and the auger blade defining a third one of the at least three flow paths.

13 . The exhaust aftertreatment system of claim 1 , wherein the second stage includes a ridge formed in a plate between the first stage and the auger blade.

14 . The exhaust aftertreatment system of claim 13 , wherein the ridge is formed on a stem plate that connects the auger blade with one of the parallel plates of the first stage.

15 . The exhaust aftertreatment system of claim 1 , wherein the parallel plates of the first stage include main bodies that are parallel to each other and parallel to a longitudinal axis of an annular housing in which the parallel plates are disposed, and wherein the parallel plates of the first stage include tabs disposed at distal ends of the main bodies, the tabs are angled relative to the main bodies and the longitudinal axis of the annular housing.

16 . The exhaust aftertreatment system of claim 1 , wherein the first stage is disposed in a cylindrical portion of the exhaust passageway and the second stage is at least partially in a conical portion of the exhaust passageway, the conical portion having a longitudinal axis that is angled relative to a longitudinal axis of the cylindrical portion.

17 . The exhaust aftertreatment system of claim 1 , wherein the first and second stages are disposed in a cylindrical portion of the exhaust passageway.

18 . The exhaust aftertreatment system of claim 1 , wherein the aftertreatment device is a selective catalytic reduction catalyst, and wherein the fluid injected by the injector is a reductant.

19 . The exhaust aftertreatment system of claim 18 , further comprising one or both of an oxidation catalyst and a particulate filter, the particulate filter disposed upstream of the injector, the oxidation catalyst disposed upstream of the particulate filter.

20 . The exhaust aftertreatment system of claim 1 , wherein the at least two flow paths are equal divisions of a total flow through the mixer assembly.

21 . The exhaust aftertreatment system of claim 1 , wherein the at least two flow paths are unequal divisions of a total flow through the mixer assembly.

22 . The exhaust aftertreatment system of claim 1 , wherein the exhaust passageway includes a cylindrical portion in which the first stage is disposed and a curved portion directly adjacent the cylindrical portion, the curved portion disposed upstream of the cylindrical portion and intersecting the cylindrical portion at an angle relative to the longitudinal axis of the cylindrical portion.

23 . The exhaust aftertreatment system of claim 22 , wherein upstream ends of at least some of the parallel plates of the first stage are offset from each other in an axial direction.

24 . The exhaust aftertreatment system of claim 23 , wherein the upstream end of one of the parallel plates that is furthest away from an intersection of the curved portion and the cylindrical portion is further axially upstream than the upstream ends of the rest of the parallel plates.

25 . The exhaust aftertreatment system of claim 24 , wherein the plurality of parallel plates are at least partially disposed within an annular housing, and wherein first and second axial ends of the annular housing are angled at a non-perpendicular angle relative to a longitudinal axis of the annular housing.

26 . An exhaust aftertreatment system comprising:
an injector configured to inject a fluid into an exhaust passageway that receives exhaust gas from a combustion engine; an aftertreatment device disposed in the exhaust passageway downstream of the injector; and a mixer assembly disposed in the exhaust passageway upstream of the aftertreatment device and downstream of the injector, the mixer assembly including an annular housing, a plurality of parallel plates disposed in the annular housing and an auger blade disposed downstream of the annular housing and the parallel plates and fixedly connected to one of the parallel plates, the mixer assembly dividing an exhaust stream into at least two flow paths.

27 . The exhaust aftertreatment system of claim 26 , wherein the auger blade is disposed in a conical portion of the exhaust passageway.

28 . The exhaust aftertreatment system of claim 26 , wherein the auger blade is disposed in a cylindrical portion of the exhaust passageway.

29 . The exhaust aftertreatment system of claim 26 , wherein the one of the parallel plates and the auger blade cooperate to form a monolithic body.

30 . The exhaust aftertreatment system of claim 26 , wherein the mixer assembly includes a plurality of auger blades.

31 . The exhaust aftertreatment system of claim 30 , wherein two of the auger blades extend in different rotational directions.

32 . The exhaust aftertreatment system of claim 31 , wherein an axis of rotation of at least one of the auger blades is offset from a longitudinal axis of the cylindrical portion of the exhaust passageway.

33 . The ex

Assignees

• Tenneco Automotive Operating Co Inc

Inventors

• Dalimonte Lawrence
• Mattei Peter J
• Golin Michael

Classifications

• F01N3/106

  Auxiliary oxidation catalysts · CPC title

• F01N3/103

  Oxidation catalysts for HC and CO only · CPC title

• F01N13/009

  having two or more separate purifying devices arranged in series · CPC title

• F01N2610/1453

  Sprayers or atomisers; Arrangement thereof in the exhaust apparatus · CPC title

• F01N3/021 Primary

  by means of filters · CPC title