Exhaust system

Patent metadata

Field	Value
Publication number	US-10577997-B2
Application number	US-201815861934-A
Country	US
Kind code	B2
Filing date	Jan 4, 2018
Priority date	Jan 5, 2017
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

An exhaust system for an internal combustion engine includes an exhaust gas flow duct (14), through which exhaust gas can flow in an exhaust gas main flow direction (A), and a reactant injection device (18) for injecting reactant in a reactant injection area (16) of the exhaust gas flow duct (14) in a reactant main injection direction (R). The reactant main injection direction (R) and the exhaust gas main flow direction (A) in the reactant injection area (16) are not parallel and not at right angles to one another.

First claim

What is claimed is:

1. An exhaust system for an internal combustion engine, the exhaust system comprising:
an exhaust gas flow duct formed in an exhaust gas flow pipe, the exhaust gas duct being configured for exhaust gas flow therethrough, in an exhaust gas main flow direction;
a reactant injection device injecting reactant in a reactant injection area of the exhaust gas flow duct in a reactant main injection direction, wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are not parallel and not at right angles to one another;
a reactant collection device in the reactant injection area, the reactant collection device comprising a plurality of reactant collection surfaces that are wetted with reactant injected by the reactant injection device, the reactant collection device comprising at least one reactant collection surface element having at least one of the reactant collection surfaces, wherein:
the at least one reactant collection surface element of the at least the reactant collection device has an undulated configuration with wave crests and with other wave crests;
the at least one reactant collection surface element is fixed to a wall of the exhaust gas flow pipe in an area of the wave crests and is not in contact with the wall of the exhaust gas flow pipe in an area of the other wave crests.

2. An exhaust system in accordance with claim 1 , wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are at an acute angle to one another.

3. An exhaust system in accordance with claim 2 , wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are at an angle in the range of 20° to 70° to one another.

4. An exhaust system in accordance with claim 1 , wherein at least two of the reactant collection surfaces are parallel to one another in at least some areas.

5. An exhaust system in accordance with claim 1 , wherein:
the at least one reactant collection surface element is fixed to the exhaust gas flow pipe by welding.

6. An exhaust system in accordance with claim 1 , wherein at least one of the reactant collection surfaces extends essentially in the direction of the exhaust gas main flow direction in the reactant injection area.

7. An exhaust system in accordance with claim 1 , wherein at least one of the reactant collection surfaces is curved in at least some areas.

8. An exhaust system in accordance with claim 1 , wherein at least two reactant collection surfaces are arranged next to each other essentially at right angles to the exhaust gas main flow direction.

9. An exhaust system in accordance with claim 1 , wherein at least two reactant collection surfaces are arranged in the reactant injection area following one another in the exhaust gas main flow direction.

10. An exhaust system in accordance with claim 1 , wherein at least two reactant collection surfaces have mutually different lengths of extension in the reactant injection area in the upstream direction opposite the exhaust gas main flow direction.

11. An exhaust system in accordance with claim 2 , wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are at an angle in the range of 40° to 60° to one another.

12. An exhaust system for an internal combustion engine, the exhaust system comprising:
an exhaust gas flow pipe comprising a wall defining an exhaust duct through which exhaust gas flows, the exhaust gas flow pipe being configured for the exhaust gas to flow in an exhaust gas main flow direction;
a reactant injection device fixed to the exhaust gas flow pipe and configured to inject reactant into a reactant injection area within the exhaust gas flow pipe duct and configured to direct the injected reactant in a reactant main injection direction that is not parallel to the exhaust gas main flow direction and is not at right angles to the exhaust gas main flow direction;
a reactant collection device disposed within the exhaust gas flow pipe in the reactant injection area, the reactant collection device comprising a reactant collection surface element providing at least one of a plurality of the reactant collection surfaces of the reactant collection device, wherein:
the reactant collection surface element comprises an undulated configuration with connection side wave crests at a connection side of the configuration and with opposite side wave crests at an opposite side of the configuration, the connection side wave crests being spaced apart from the opposite side wave crests; and
at least a portion of the connection side of the configuration is fixed to an inner side of the wall of the exhaust gas flow pipe to position the undulated configuration within the exhaust duct with the opposite wave crests spaced apart from the inner wall of the exhaust gas flow pipe.

13. An exhaust system in accordance with claim 12 , wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are at an acute angle to one another.

14. An exhaust system in accordance with claim 13 , wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are at an angle in the range of 20° to 70° to one another.

15. An exhaust system in accordance with claim 13 , wherein the reactant main injection direction and the exhaust gas main flow direction in the reactant injection area are at an angle in the range of 40° to 60° to one another.

16. An exhaust system in accordance with claim 12 , wherein at least two of the plurality of reactant collection surfaces are parallel to one another in at least some areas.

17. An exhaust system in accordance with claim 12 , wherein the at least one reactant collection surface element is fixed to the exhaust gas flow pipe by welding.

18. An exhaust system in accordance with claim 12 , wherein at least two of the plurality of reactant collection surfaces are arranged in the reactant injection area following one another in the exhaust gas main flow direction.

19. An exhaust system in accordance with claim 12 , wherein:
the reactant collection surface element comprises a plurality of reactant collection surfaces;
the wave crests at a connection side include at least two connection side wave crests, each of the at least two connection side wave crests having a wave crest surface with a fixation area fixed to the inner wall of the exhaust gas flow pipe; and
each of the plurality of reactant collection surfaces of the reactant collection surface element connects one of the wave crests at a connection side to at least one of the opposite side wave crests.

20. An exhaust system in accordance with claim 19 , wherein the reactant collection surface element comprises at least four reactant collection surfaces.

Assignees

• Eberspaecher Exhaust Tech Gmbh

Inventors

• Kast Peter
• Wolf Tobias
• Henzler Markus
• Bucher Torsten

Classifications

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title

• F01N2610/1453

  Sprayers or atomisers; Arrangement thereof in the exhaust apparatus · CPC title

• F01N3/36 Primary

  Arrangements for supply of additional fuel · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N3/2892

  Exhaust flow directors or the like, e.g. upstream of catalytic device · CPC title