Multistage plate mixer

Patent metadata

Field	Value
Publication number	US-9556773-B2
Application number	US-201313940935-A
Country	US
Kind code	B2
Filing date	Jul 12, 2013
Priority date	Jul 12, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A mixing and/or evaporating device ( 12 ) for an exhaust system ( 5 ) of an internal combustion engine ( 1 ) encloses in the circumferential direction a cross section, through which flow is possible. The device ( 12 ) has two mutually opposite long side walls ( 21, 22 ) and two mutually opposite short side walls ( 23, 24 ). The short side walls ( 23, 24 ) connect each the two long side walls ( 21, 22 ) to one another. A plurality of guide blades ( 25 ), which project in the direction of the other long side wall ( 21, 22 ) and are set at an angle in relation to the axial direction ( 20 ), are arranged at at least one axial end ( 26, 27 ) at at least one long side wall ( 21, 22 ). Additional guide blades ( 29 ) are arranged at at least one long side wall ( 21, 22 ) at a distance (s) in the axial direction ( 20 ) from an axial end ( 26 ).

First claim

The invention claimed is:

1. A device for an exhaust system of an internal combustion engine, the device comprising:
a carrier, which defines, in a device circumferential direction, a flat cross section, through which flow is possible, the flat cross section extending at right angles to a device axial direction, the carrier comprising:
two mutually opposite long side walls and two mutually opposite short side walls, wherein the short side walls each connect the two long side walls to one another; and
a plurality of guide blades, which each project from at least one long side wall in a direction of the other long side wall, set at a pitch angle in relation to the device axial direction at at least one axial end of the at least one long side wall, each of said plurality guide blades being connected to said axial end at a position along a length of said axial end, and wherein additional guide blades are arranged at least at one long side wall in the axial direction at one or more distance from the at least one axial end.

2. A device in accordance with claim 1 , wherein the additional guide blades project from the long side wall at an acute angle and are bent about an axis extending in parallel to the device axial direction.

3. A device in accordance with claim 1 , wherein a length of the additional guide blades is selected to be such that a free end of the additional guide blades projects beyond a central longitudinal plane extending in the middle between the long side walls.

4. A device in accordance with claim 1 , wherein two additional guide blades, each arranged at opposite side walls, are arranged such that they are arranged at the same distance in the axial direction from the axial end of the respective side wall.

5. A device in accordance with claim 1 , wherein the plurality of guide blades are arranged along at least one long side wall at said one axial end at right angles to the device axial direction in relation to one another such that the guide blades located closest to the short side walls have a greater distance in the device axial direction from an opposite axial end of the at least one long side wall than the guide blades arranged closer to a center of the carrier at right angles to the device axial direction.

6. A device in accordance with claim 1 , wherein the additional guide blades project at right angles from the long side wall and extend in the direction of the respective opposite wall, and the additional guide blades are set at a pitch angle in relation to the device axial direction.

7. A device in accordance with claim 1 , wherein a further guide blade is arranged at at least one short side wall, said further guide blade projecting at an acute angle from the short side wall and being bent about an axis extending at right angles to the central longitudinal plane.

8. A device in accordance with claim 1 , wherein all guide blades are formed integrally on the respective side wall, each of said guide blades extending inwardly from an outermost edge of said at least one long side wall in a direction of the other long side wall, wherein each of said guide blades is arranged between said two short side walls on an incoming flow side of said carrier.

9. A device in accordance with claim 1 , wherein all side walls are formed integrally on the carrier, said carrier comprising an incoming flow side and a discharge side, each of said guide plates being arranged at least on said incoming flow side, wherein each of said guide blades comprises a planar surface, said planar surface of each of said guide blades facing in a direction of one of said short side walls.

10. An exhaust system for an internal combustion engine, especially of a motor vehicle, with at least one SCR catalytic converter, with a reducing agent feed means, which has at least one injector for feeding a reducing agent into the exhaust gas stream upstream of the SCR catalytic converter, and with at least one device arranged between the at least one injector and the at least one SCR catalytic converter, the device comprising a wall structure defining, in a device circumferential direction, a flat flow cross section that extends at a right angle to a device axial direction, the wall structure comprising:
two mutually opposite long side walls;
two mutually opposite short side walls, wherein the short side walls each connect the two long side walls to one another;
a plurality of guide blades projecting from at least one long side wall in a direction of the other long side wall, the plurality of guide blades each having a pitch angle in relation to the device axial direction and being disposed at at least one axial end of the at least one long side wall, each of said plurality guide blades being connected to said axial end at a position along a length of said axial end; and
an additional guide blade arranged at one long side wall and spaced from the at least one axial end in the axial direction.

11. An exhaust system in accordance with claim 10 , wherein the additional guide blade projects from the long side wall at an acute angle and is bent about an axis extending in parallel to the device axial direction, each of said guide blades comprising a planar surface for engaging an incoming flow of fluid, said planar surface of each of said guide blades facing in a direction of one of said short side walls, said two mutually opposite long side walls and said two mutually opposite short sides defining said flat cross section through which fluid flows.

12. An exhaust system in accordance with claim 10 , wherein a length of the additional guide blade is selected to be such that a free end of the additional guide blade projects beyond a central longitudinal plane extending in the middle between the long side walls.

13. An exhaust system in accordance with claim 10 , wherein the wall structure further comprises another additional guide blade, to provide at least two additional guide blades whereby each additional guide blade is arranged on an opposite long side walls spaced the same distance, in the axial direction, from the axial end of the respective long side wall.

14. An exhaust system in accordance with claim 10 , wherein the plurality of guide blades include guide blades disposed at said at least one axial end and located closest to the short side walls with a greater distance in the device axial direction from an opposite axial end of the at least one long side wall than the guide blades disposed at said at least one axial end and arranged farther from the short side walls.

15. An exhaust system in accordance with claim 10 , wherein the additional guide blade projects at right angles from the long side wall and extends in a direction of the respective opposite wall, and is set at a pitch angle in relation to the device axial direction.

16. An exhaust system in accordance with claim 10 , wherein the wall structure further comprises a further guide blade arranged at at least one short side wall, the further guide blade projecting at an acute angle from the short side wall and being bent about an axis extending at right angles to the central longitudinal plane.

17. An exhaust system in accordance with claim 10 , wherein the wall structure is an integral single piece structure, each of said guide blades extending inwardly from an outermost edge of said at least one long side wall in a direction of the other long side wall, wherein each of said guide blades is arranged between said two short side walls on an incoming flow side of said carrier.

18. An SCR catalytic converter for an exhaust system of an internal co

Assignees

• Eberspächer Exhaust Tech Gmbh & Co Kg

Inventors

• Calvo Silvia

Classifications

• B01F5/0617

  Operations & Transport · mapped topic

• B01F3/04049

  Operations & Transport · mapped topic

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N3/208 Primary

  Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title

• B01F5/0473

  Operations & Transport · mapped topic