# US 2014/0154142 A1 · Diesel exhaust fluid injector assembly

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- Number: US 2014/0154142 A1
- Document ID: US20140154142A1
- Status: Published application
- Kind: A1
- Application number: 13/706,082
- Filed: 2012-12-05
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Cummins PowerGen IP, Inc.; Cummins Cal Pacific, LLC
- Inventors: Claude M. Johnson; Mark Yragui; Herman Van Niekerk; Farzan Roshdieh
- Web page: https://patentgrep.com/patent/US20140154142A1

## CPC

- B01F 25/25: Mixing by jets impinging against collision plates
- B01F 23/2132: {using nozzles}
- F01N 3/0253: {adding fuel to exhaust gases}
- F01N 3/206: {Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/36: Arrangements for supply of additional fuel
- B01F 2215/0422: Numerical values of angles
- F01N 2260/022: using air
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- Y02T 10/12: Improving ICE efficiencies
- Y10T 137/87587: Combining by aspiration
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A diesel exhaust fluid (DEF) injector assembly is provided for use in an engine exhaust after-treatment system. The DEF injector assembly includes an injector body having a fluid inlet and a fluid outlet that delivers the DEF to an engine exhaust stream. The DEF injector assembly may also include a valve that opens and closes the fluid outlet of the injector body. An exemplary DEF injector assembly further includes an impact structure with an inclined impact surface that disperses and distributes the injected DEF into the engine exhaust stream. Another exemplary DEF injector assembly further includes a shroud that insulates the injector body.

## Claims

### Claim 1

A diesel exhaust fluid (DEF) injector assembly comprising:
an injector body comprising:
a proximal end portion;
a distal end portion;
a fluid pathway;
a fluid inlet to the fluid pathway;
a fluid outlet from the fluid pathway disposed at the distal end portion, the fluid outlet dispensing a fluid from the injector body along a longitudinal axis; and
an impact structure positioned in fluid communication with the fluid outlet of the injector body, the impact structure having an impact surface that faces toward the injector body, a plane perpendicular to the longitudinal axis intersecting the impact surface, at least a portion of the impact surface deviating from the plane.

### Claim 2 (depends on 1)

The DEF injector assembly of claim 1, wherein, in a direction perpendicular to the longitudinal axis, at least a portion of the impact structure is larger in size than the fluid outlet of the injector body.

### Claim 3 (depends on 1)

The DEF injector assembly of claim 1, wherein the impact structure increases in size along the longitudinal axis from a first point proximate to the fluid outlet to a second point away from the fluid outlet.

### Claim 4 (depends on 1)

The DEF injector assembly of claim 1, wherein the longitudinal axis intersects one of:
the deviating portion of the impact surface of the impact structure; and
a tip of the impact surface of the impact structure.

### Claim 5 (depends on 1)

The DEF injector assembly of claim 1, wherein the deviating portion of the impact surface of the impact structure forms an angle with the longitudinal axis between 90 degrees and 180 degrees.

### Claim 6 (depends on 5)

The DEF injector assembly of claim 5, wherein the angle is about 135 degrees.

### Claim 7 (depends on 1)

The DEF injector assembly of claim 1, wherein the impact structure further comprises a plurality of steps in the deviating portion of the impact surface.

### Claim 8 (depends on 1)

The DEF injector assembly of claim 1, wherein the impact structure is in the shape of a cone.

### Claim 9 (depends on 1)

The DEF injector assembly of claim 1, wherein the impact structure has a planar upper surface proximate the injector body and a planar lower surface parallel to the planar upper surface, wherein the planar lower surface projects beyond the planar upper surface in an area that intersects the longitudinal axis to form the deviating portion of the impact surface.

### Claim 10 (depends on 9)

The DEF injector assembly of claim 9, wherein the planar upper surface has a smaller surface area than the planar lower surface to form the deviating portion of the impact surface, the impact structure being one of hemispherical-shaped and crescent-shaped.

### Claim 11 (depends on 1)

The DEF injector assembly of claim 1, wherein the impact structure is secured to the DEF injector assembly via at least one threaded fastener, the impact structure defining at least one aperture that receives the at least one fastener.

### Claim 12 (depends on 1)

The DEF injector assembly of claim 1, wherein the impact structure is secured to the DEF injector assembly via one or more of a U-shaped arm, a tripod, a hook, a snap, and a fastener.

### Claim 13 (depends on 1)

The DEF injector assembly of claim 1, further comprising a valve moveable relative to the injector body to open and close the fluid outlet of the injector body.

### Claim 14

A diesel exhaust fluid (DEF) injector assembly for treatment of an exhaust stream, the DEF injector assembly comprising:
an injector body comprising:
a proximal end portion;
a distal end portion;
a longitudinal axis;
a fluid inlet;
a fluid outlet at the distal end portion, the fluid outlet in fluid communication with the exhaust stream; and
a fluid pathway extending between the fluid inlet and the fluid outlet; and
a shroud around the injector body that defines an air gap between the injector body and the exhaust stream.

### Claim 15 (depends on 14)

The DEF injector assembly of claim 14, further comprising a cooling jacket located between the shroud and the injector body, the cooling jacket including a fluid passageway in communication with a heat transfer fluid.

### Claim 16 (depends on 15)

The DEF injector assembly of claim 15, wherein the injector body and the cooling jacket are in fluid communication with the same urea source.

### Claim 17 (depends on 14)

The DEF injector assembly of claim 14, wherein the shroud tapers inward toward the distal end portion of the injector body to close the air gap.

### Claim 18 (depends on 14)

The DEF injector assembly of claim 14, further comprising a distal base coupled to the distal end portion of the injector body, wherein the shroud one of:
coupled to the distal base of the injector body and spaced apart from the proximal end portion of the injector body; and
coupled to the proximal end portion of the injector body and spaced apart from the distal base of the injector body.

### Claim 19 (depends on 14)

The DEF injector assembly of claim 14, wherein the air gap of the shroud is open near the proximal end portion of the injector body.

### Claim 20

An exhaust treatment system for an engine comprising:
a housing having inlet for receiving an exhaust stream from the engine and an outlet for discharging the exhaust stream;
a urea source;
a fluid injector assembly having a longitudinal axis, the fluid injector assembly comprising:
a fluid inlet in fluid communication with the urea source;
a fluid outlet in fluid communication with the exhaust stream; and
an impact structure having an impact surface in fluid communication with the fluid outlet, wherein at least a portion of the impact surface is inclined relative to the longitudinal axis; and
a catalyst disposed downstream of the fluid injector assembly.

### Claim 21 (depends on 20)

The exhaust treatment system of claim 20, wherein a plane perpendicular to the longitudinal axis of the fluid injector assembly intersects one of:
the inclined portion of the impact surface, the inclined portion of the impact surface deviating from the plane; and
a tip of the impact surface.

### Claim 22 (depends on 20)

The exhaust treatment system of claim 20, wherein the fluid injector assembly further comprises a shroud that defines an air gap between the fluid injector assembly and the exhaust stream.

### Claim 23 (depends on 20)

The exhaust treatment system of claim 20, wherein the catalyst is a selective catalytic reduction converter.

### Claim 24 (depends on 20)

The exhaust treatment system of claim 20, further comprising a particulate filter section disposed downstream of the fluid injector assembly.

### Claim 25 (depends on 24)

The exhaust treatment system of claim 24, further comprising a heating section with at least one heating element disposed upstream of the particulate filter section.