Flow device for exhaust treatment system

Patent metadata

Field	Value
Publication number	US-9810126-B2
Application number	US-201314035234-A
Country	US
Kind code	B2
Filing date	Sep 24, 2013
Priority date	Jan 12, 2010
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

An exhaust treatment system includes an exhaust conduit for conveying exhaust gases from an engine of a vehicle. An aftertreatment device is disposed in the exhaust conduit. A flow device is disposed upstream of the aftertreatment device. The flow device includes a base having a first surface and an oppositely disposed second surface. The base defines a plurality of openings. A plurality of flow deflectors is engaged to the base at the plurality of openings. Each flow deflector includes a first deflector that extends outwardly from the first surface of the base and a second deflector that extends outwardly from the second surface of the base. The first and second deflectors define a passage. Flow of exhaust gases through the passage cause exhaust gases to swirl about a longitudinal axis of the exhaust conduit.

First claim

What is claimed is:

1. An exhaust conduit adapted to cause exhaust gases to swirl about a longitudinal axis of the exhaust conduit when the exhaust gases flow through the exhaust conduit, the exhaust conduit comprising:
a wall having a first side and an oppositely disposed second side, the wall defining a central flow passage extending through the wall, wherein the central flow passage is centered about the longitudinal axis of the exhaust conduit; and
a plurality of flow deflecting passages extending through the wall, the plurality of flow deflecting passages being positioned around the central flow passage, the plurality of flow deflecting passages including a first set disposed at a first radial distance from the longitudinal axis and a second set disposed at a second radial distance from the longitudinal axis, and wherein the second radial distance is less than the first radial distance, the flow deflecting passages each including:
a hole in the wall, the hole defining a perimeter;
a first flow deflecting member extending from the first side of the wall, the first flow deflecting member joined to the wall at a first portion of the perimeter; and
a second flow deflecting member extending from the second side of the wall, the second flow deflecting member joined to the wall at a second portion of the perimeter.

2. The exhaust conduit of claim 1 , wherein the wall includes a plate and the holes of the plurality of flow deflecting passages are included in the plate.

3. The exhaust conduit of claim 2 , wherein the holes of the plurality of flow deflecting passages are formed holes, wherein a first portion of material from each of the formed holes is included in a corresponding one of the first flow deflecting members, and wherein a second portion of material from each of the formed holes is included in a corresponding one of the second flow deflecting members.

4. The exhaust conduit of claim 3 , wherein the first flow deflecting members and the second flow deflecting members are formed scoop-shaped deflecting members.

5. The exhaust conduit of claim 2 , wherein the plate defines a plurality of notches disposed at a periphery of the plate, the notches extending through the first side and the second side of the wall.

6. The exhaust conduit of claim 1 , wherein the first flow deflecting member and the second flow deflecting member of a corresponding one of the flow deflecting passages define a passage axis and at least partially face each other about the passage axis.

7. The exhaust conduit of claim 6 , wherein the passage axis is disposed at an angle α with respect to the first side of the wall, the angle α being in a range of 30 degrees to 60 degrees.

8. The exhaust conduit of claim 1 , wherein the wall includes a flow blocking portion adapted to block flow of the exhaust gases parallel to the longitudinal axis of the exhaust conduit through the flow blocking portion.

9. The exhaust conduit of claim 1 , wherein each of the first and the second flow deflecting members includes compound curvature.

10. A flow device comprising:
a plate having a first side and an oppositely disposed second side;
a first plurality of flow deflectors formed from the plate, the first plurality of flow deflectors extending outwardly from the first side of the plate;
a second plurality of flow deflectors formed from the plate, the second plurality of flow deflectors extending outwardly from the second side of the plate;
each of the first plurality of flow deflectors corresponding to one of the second plurality of flow deflectors to form a pair, wherein a first set of the flow deflector pairs is disposed at a first radial spacing from a center of the plate and a second set of the flow deflector pairs is disposed at a second radial spacing from the center of the plate, the second radial spacing being different from the first radial spacing;
a plurality of holes in the plate, each of the holes corresponding to one of the flow deflector pairs;
wherein a first portion of material from each of the holes is included in the corresponding one of the flow deflectors of the first plurality of flow deflectors; and
wherein a second portion of material from each of the holes is included in the corresponding one of the flow deflectors of the second plurality of flow deflectors.

11. The flow device of claim 10 , wherein each of the flow deflectors includes compound curvature.

12. The flow device of claim 11 , wherein each of the flow deflectors is a scoop-shaped flow deflector.

13. The flow device of claim 10 , wherein the flow deflectors of each flow deflector pair are oppositely disposed about the corresponding hole.

14. The flow device of claim 10 , further comprising a central flow passage extending through the plate, wherein the plurality of holes are positioned around the central flow passage.

15. The flow device of claim 14 , wherein the plate defines a plurality of notches disposed at a periphery of the plate, the notches extending through the first side and the second side of the plate.

16. The flow device of claim 15 , wherein the holes of the plurality of holes and the notches of the plurality of notches are alternately arranged about a central axis.

17. An exhaust treatment system comprising:
an exhaust conduit for conveying exhaust gases from an engine of a vehicle, the exhaust conduit defining a longitudinal axis;
an aftertreatment device disposed in the exhaust conduit; and
a flow device disposed upstream of the aftertreatment device, the flow device comprising:
a plate having an upstream side and an oppositely disposed downstream side;
an opening that extends through the upstream side and the downstream side of the plate;
a plurality of first flow deflecting members extending from the upstream side of the plate, each of the first flow deflecting members including a perimeter having a portion that extends around a first portion of the opening; and
a plurality of second flow deflecting members extending from the downstream side of the plate, each of the second flow deflecting members including a perimeter having a portion that extends around a second portion of the opening;
wherein the first and second flow deflecting members include a first set disposed at a first radial distance from the longitudinal axis and a second set disposed at a second radial distance from the longitudinal axis, and wherein the second radial distance is less than the first radial distance;
wherein the opening is one of a plurality of the openings that extends through the upstream side and the downstream side of the plate; and
wherein the pluralities of the flow deflecting members are arranged to cause the exhaust gases to swirl about a central axis of the flow device.

18. The exhaust treatment system of claim 17 , wherein:
each of the openings has a corresponding one of the first flow deflecting members; and
each of the openings also has a corresponding one of the second flow deflecting members.

19. An exhaust treatment system comprising:
an exhaust conduit for conveying exhaust gases from an engine of a vehicle, the exhaust conduit defining a longitudinal axis;
an aftertreatment device disposed in the exhaust conduit; and
a flow device disposed upstream of the aftertreatment device, the flow device comprising:
a plate having an upstream side and an oppositely disposed downstream side;
an opening that extends through the upstream side and the downstream side of the plate;
a plurality of first flow deflecting members extending from the upstream side of the pl

Assignees

• Donaldson Co Inc

Inventors

• Lebas Jérôme
• Le Tallec Stanislas
• Provost Antoine
• Le Merdy Stéphane
• Preethi Phebe Helena
• Way Paul Anthony

Classifications

• F01N2240/20

  a flow director or deflector · CPC title

• B01F5/0688

  Operations & Transport · mapped topic

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• B01F5/0451

  Operations & Transport · mapped topic

• B01F5/0682

  Operations & Transport · mapped topic