# US 2014/0196440 A1 · Reductant aqueous solution mixing device and exhaust aftertreatment device provided with the same

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- Number: US 2014/0196440 A1
- Document ID: US20140196440A1
- Status: Published application
- Kind: A1
- Application number: 14/000,481
- Filed: 2013-01-17
- Published: 2014-07-17
- Earliest claimed: 2013-01-17
- Assignees: Komatsu Ltd.
- Inventors: Takashi Katou; Hiroyuki Tomioka; Boku Itou
- Web page: https://patentgrep.com/patent/US20140196440A1

## CPC

- F01N 13/009: {having two or more separate purifying devices arranged in series}
- B01F 23/2132: {using nozzles}
- B01F 25/102: {wherein the vortex is created by two or more jets introduced tangentially in separate mixing chambers or consecutively in the same mixing chamber}
- B01F 25/3131: {with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements}
- B01F 25/31425: {with a plurality of perforations in the axial and circumferential direction covering the whole surface}
- B01F 25/435: Mixing tubes composed of concentric tubular members
- F01N 3/035: with catalytic reactors
- F01N 3/106: {Auxiliary oxidation catalysts}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device}
- F01N 13/08: Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)}
- B01F 2025/931: {Flow guiding elements surrounding feed openings, e.g. jet nozzles}
- 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 includes: an elbow pipe attached to an outlet pipe of a filter device, the elbow pipe changing a flow direction of an exhaust gas flowing from the filter device; a straight pipe connected to a downstream side of the elbow pipe, the straight pipe extending in a direction intersecting an axial line of the outlet pipe; an injector attached to the elbow pipe and injecting a reductant aqueous solution inside the elbow pipe toward the straight pipe; and a mixing pipe disposed in the elbow pipe to serve as a cover for the reductant aqueous solution, the mixing pipe being provided with openings on a circumferential wall thereof. A cutout is provided at a fixing portion of the mixing pipe with the elbow pipe at a position for allowing the exhaust gas entering through an inlet of the elbow pipe to flow toward the injection nozzle.

## Claims

### Claim 1

A reductant aqueous solution mixing device interposed between a filter device that captures particulate matters in an exhaust gas and a selective catalytic reduction device disposed downstream of the filter device, the reductant aqueous solution mixing device adding a reductant aqueous solution in the exhaust gas, the reductant aqueous solution mixing device comprising:
an elbow pipe attached to an outlet pipe of the filter device, the elbow pipe changing a flow direction of the exhaust gas flowing from the filter device;
a straight pipe connected to a downstream side of the elbow pipe, the straight pipe extending in a direction intersecting an axial line of the outlet pipe of the filter device;
an injector attached to the elbow pipe, the injector injecting the reductant aqueous solution into an inside of the elbow pipe toward the straight pipe; and
a mixing pipe disposed in the elbow pipe to serve as a cover for the reductant aqueous solution injected from the injector, the mixing pipe being provided with a plurality of openings on a circumferential wall thereof,
wherein a cutout is provided to a portion of the mixing pipe fixed with the elbow pipe at a position adapted to allow the exhaust gas flowing through the inlet of the elbow pipe to flow toward the injection nozzle of the injector.

### Claim 2 (depends on 1)

The reductant aqueous solution mixing device according to claim 1, wherein the plurality of openings are provided on the mixing pipe near the straight pipe.

### Claim 3 (depends on 1)

The reductant aqueous solution mixing device according to claim 1, wherein when the mixing pipe is seen from an axial line of the straight pipe toward the inlet of the elbow pipe, the cutout is omitted for a predetermined width in a circumferential direction of the mixing pipe.

### Claim 4 (depends on 3)

The reductant aqueous solution mixing device according to claim 3, wherein when the mixing pipe is seen from the axial line of the straight pipe toward the inlet of the elbow pipe, an injection area of the reductant aqueous solution injected from the injector is within an area in which the cutout of the mixing pipe is omitted.

### Claim 5 (depends on 1)

An exhaust aftertreatment device, comprising:
a filter device that captures particulate matters in an exhaust gas;
a reductant aqueous solution mixing device according to claim 1, the reductant aqueous solution mixing device being disposed downstream of the filter device in parallel to the filter device; and
a selective catalytic reduction device disposed downstream of the reductant aqueous solution mixing device, the selective catalytic reduction device reducing and purifying a nitrogen oxide in the exhaust gas.