Mixing device

Patent metadata

Field	Value
Publication number	US-10995643-B2
Application number	US-201916357874-A
Country	US
Kind code	B2
Filing date	Mar 19, 2019
Priority date	Mar 9, 2015
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A mixer assembly comprises a tubular housing including a reductant inlet, an exhaust gas inlet and an exhaust gas outlet. The tubular housing defines a longitudinal axis along which exhaust enters the housing. The reductant inlet is positioned on a first side of the tubular housing. An upstream element covers approximately one-half of the cross sectional area of the enhaust gas inlet and is positioned upstream of the reductant inlet. An upstream surface of the upstream mixing element directs exhaust gas flow transversly toward the reductant inlet. A downstream mixing element along with the upstream mixing element at least partially defines a reductant receiving duct in which injected reductant and exhaust gas mix.

First claim

The invention claimed is:

1. A mixer assembly for mixing an injected reductant with an exhaust gas output from a combustion engine, comprising:
a tubular housing including a reductant inlet, an exhaust gas inlet and an exhaust gas outlet, the tubular housing defining a longitudinal axis along which the exhaust enters the housing, wherein the reductant inlet is positioned on a first side of the tubular housing;
an upstream mixing element covering substantially one-half of a cross-sectional area of the exhaust gas inlet, wherein the upstream mixing element is positioned upstream from the reductant inlet, wherein an upstream surface of the upstream mixing element directs the exhaust gas flow transversely across the tubular housing toward the reductant inlet; and
a downstream mixing element positioned downstream from the reductant inlet and the upstream mixing element, wherein the upstream mixing element and the downstream mixing element at least partially define a reductant receiving duct in which the injected reductant and the exhaust gas mix.

2. The mixer assembly of claim 1 , wherein the downstream mixing element urges the exhaust gas to flow radially in a direction away from the reductant inlet.

3. The mixer assembly of claim 1 , wherein the downstream mixing element covers substantially one-half of a cross-sectional area of the tubular housing.

4. The mixer assembly of claim 1 , wherein the reductant receiving duct is shaped to impart a swirling motion on the mixed injected reductant and exhaust gas.

5. The mixer assembly of claim 1 , wherein a divider is positioned downstream from the upstream surface of the upstream mixing element to split the exhaust gas into two divided flow streams.

6. The mixer assembly of claim 5 , wherein the divider is intersected by an axis along which the reductant is injected.

7. The mixer assembly of claim 5 , wherein the two divided flow streams swirl in opposite directions to one another.

8. The mixer assembly of claim 7 , wherein the injected reductant impacts the two divided flow streams.

Assignees

• Tenneco Gmbh

Inventors

• Haverkamp Sascha
• Gehrlein Joachim
• Kohrs Stefan
• Hein Eric A
• Kovacs Attila

Classifications

• B01F25/4323

  using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors · CPC title

• B01F25/4233

  using plates with holes, the holes being displaced from one plate to the next one to force the flow to make a bending movement · CPC title

• B01F25/3141 Primary

  with additional mixing means other than injector mixers · CPC title

• B01F23/2132

  using nozzles · CPC title

• F01N3/10

  by thermal or catalytic conversion of noxious components of exhaust · CPC title