# US 2018/0023443 A1 · Mixing device

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- Number: US 2018/0023443 A1
- Document ID: US20180023443A1
- Status: Published application
- Kind: A1
- Application number: 15/552,648
- Filed: 2016-03-15
- Published: 2018-01-25
- Earliest claimed: 2015-03-25
- Applicants: Tenneco GmbH
- Inventors: Tobias INCLAN; Yves-Antoine ROGARD
- Web page: https://patentgrep.com/patent/US20180023443A1

## CPC

- F01N 3/2066: {Selective catalytic reduction [SCR]}
- B01F 23/2132: {using nozzles}
- B01F 25/3141: {with additional mixing means other than injector mixers}
- B01F 25/43171: {Profiled blades, wings, wedges, i.e. plate-like element having one side or part thicker than the other}
- B01F 25/431971: {Mounted on the wall}
- F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device}
- B01F 2025/931: {Flow guiding elements surrounding feed openings, e.g. jet nozzles}
- F01N 2240/20: a flow director or deflector
- F01N 2470/02: Tubes being perforated
- F01N 2610/14: Arrangements for the supply of substances, e.g. conduits
- F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A mixing device for integrating into an exhaust pipe of an internal combustion engine and for intermixing an exhaust gas flow T, which device is formed by a housing including a pipe wall for guiding the exhaust gas in a main flow direction H, an intermediate wall which at least partially delimits a flow cross section Qs of the housing, and by a mixing pipe, wherein: the mixing pipe has an injection nozzle for an additive to be incorporated, the nozzle being in the region of a first end E1 of the mixing pipe, and the mixing pipe is accommodated, in the region of a second end E2, in the intermediate wall; a perforation zone having a through-flow cross section Qp is provided at least between the injection nozzle and the intermediate wall; the intermediate wall and the mixing pipe 5 separate the housing into an inflow sector and an outflow sector; at least 90% of the gas to be guided from the inflow sector to the outflow sector can be directed through the perforation zone; a wedge-shaped flow-directing element having a directing nose is provided after the mixing pipe, which nose protrudes beyond the pipe wall and/or the intermediate wall and by means of which the exhaust gas flow T can be divided into two partial flows T1, T2; and wherein the partial flows T1, T2 can be brought into a counter swirl flow in relation to the main flow direction H.

## Claims

### Claim 1

A mixing device for integrating into an exhaust pipe of an internal combustion engine and for intermixing an exhaust gas flow T, comprising: a housing comprising a pipe wall for guiding the exhaust gas in a main flow direction H and an intermediate wall which at least partially delimits a flow cross section Qs of the housing and by a mixing pipe, wherein the mixing pipe has an injection nozzle for an additive to be incorporated in the region of a first end, and is accommodated in the region of a second end in the intermediate wall, wherein a perforation zone having a through-flow cross-section Qp is provided at least between the injection nozzle and the intermediate wall, wherein the intermediate wall and the mixing pipe separate the housing into an inflow sector and an outflow sector, wherein at least 90% of the gas to be guided from the inflow sector to the outflow sector can be directed through the perforation zone, wherein after the mixing pipe, a wedge-shaped flow directing element is provided with a directing nose which protrudes over the pipe wall and/or the intermediate wall, and by means of which the exhaust gas flow T can be divided into two partial flows T1, T2, wherein the partial flows T1, T2 can be brought into a counter swirl in relation to the main flow direction H.

### Claim 2 (depends on 1)

The mixing device according to claim 1, wherein
the mixing tube has an oval profile form F with a height h
running along a main axis and a breadth b
running along an auxiliary axis wherein the main axis is aligned
transverse to the main flow direction H of the exhaust gas flow, with
h>=1.2 b.

### Claim 3 (depends on 2)

The mixing device according to claim 2, wherein
the following applies to the through-flow cross section Qp of the perforation zone
in relation to the flow cross section Qs of the housing:
0. 05 Qs<=Qp<=0.6 Qs or 0.07 Qs<=Qp<=0.5 Qs or 0.08 Qs<=Qp<=0.45 Qs.

### Claim 4 (depends on 1)

An exhaust pipe with an integrated mixing device according to claim 1.

### Claim 5 (depends on 4)

An exhaust system with an exhaust pipe according to claim 4.

### Claim 6 (depends on 2)

An exhaust pipe with an integrated mixing device according to claim 2.

### Claim 7 (depends on 3)

An exhaust pipe with an integrated mixing device according to claim 3.

### Claim 8 (depends on 7)

An exhaust system with an exhaust pipe according to claim 7.