Catalytic converter device with injection section

Patent metadata

Field	Value
Publication number	US-9938878-B2
Application number	US-201414519624-A
Country	US
Kind code	B2
Filing date	Oct 21, 2014
Priority date	Oct 22, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

An injection section ( 12 ) of an exhaust system for an internal combustion engine, with a channel ( 13 ) for guiding an exhaust gas flow ( 3 ), with an injection port ( 14 ), laterally on the channel to which a liquid or gas injector ( 15 ) can be connected, and with an injection chamber ( 16 ), formed in the channel in the area of the injector port. The chamber is defined by a perforated, first flow through partition ( 17 ), arranged in the channel upstream of the injector port relative to the exhaust gas flow and, and by a perforated, second flow through partition, arranged in the channel downstream of the injector port relative to the exhaust gas flow. Improved mixing and/or evaporation is achieved with the perforation portion of the first partition generating at least two partial exhaust gas flows ( 20, 21 ), which form two mutually opposite flow swirls ( 22, 23 ).

First claim

What is claimed is:

1. An injection section of an exhaust system for an internal combustion engine, the injection section comprising:
a channel for guiding an exhaust gas flow;
an injector port arranged laterally on the channel and to which an injector can be connected for introducing a liquid or gas into the exhaust gas flow;
an injection chamber, which is formed in the channel in an area of the injector port, the injection chamber being defined by a perforated first partition, arranged in the channel upstream of the injector port relative to the exhaust gas flow and through which the exhaust gas flow can flow, and also a perforated second partition, arranged in the channel downstream of the injector port in relation to the exhaust gas flow and through which the exhaust gas flow can flow, wherein:
a perforation portion of the first partition generates at least two partial exhaust gas flows, which form two mutually opposite flow swirls, during a flow through the first partition within the injection chamber, one of the two partial exhaust gas flows moving in a first flow direction, another one of the at least two partial exhaust gas flows moving in a second flow direction, the first flow direction being opposite the second flow direction, wherein the one of the at least two partial exhaust gas flows is laterally adjacent to the another one of the at least two partial exhaust gas flows; and
the two partial exhaust gas flows flow separately proximally to a channel wall, defining the injection chamber laterally, and flow together distally from the channel wall.

2. An injection section in accordance with claim 1 , wherein the perforation portion of the first partition is symmetrical to a central longitudinal plane of the channel, so that the two flow swirls are formed symmetrically to the central longitudinal plane during a flow through the first partition.

3. An injection section in accordance with claim 2 , wherein the injector port is arranged in this central longitudinal plane.

4. An injection section in accordance with claim 1 , wherein the two partial exhaust gas flows flow away each from the injector port proximally to the channel wall and flow together towards the injector port distally from the channel wall.

5. An injection section in accordance with claim 1 , wherein for generating the flow swirls, the perforation portion of the first partition has first openings, which are arranged proximally to the channel wall and which has a discharge area each facing away from the injector port in the injection chamber.

6. An injection section in accordance with claim 5 , wherein the discharge areas are formed by means of wall sections of the first partition, which wall sections project from a remainder of the first partition into the injection chamber.

7. An injection section in accordance with claim 5 , wherein the first openings have an inlet area each facing the injector port on an incoming flow side facing away from the injection chamber.

8. An injection section in accordance with claim 1 , wherein a perforation portion of the second partition has openings, which are shielded with guide surfaces, which project into the injection chamber.

9. An injection section in accordance with claim 8 , wherein the openings of the perforation portion of the second partition have first openings, which are arranged proximally to the channel wall, are elongated and extend essentially in the circumferential direction and which are shielded in the radially inwardly direction by the respective guide surface.

10. An injection section in accordance with claim 8 , wherein the openings of the perforation portion of the second partition have second openings, which are arranged distally from the channel wall and which are shielded with the respective guide surface towards the injector port.

11. An injection section in accordance with claim 1 , wherein the first partition extends essentially at right angles to a central longitudinal axis of the channel.

12. An injection section in accordance with claim 1 , wherein the second partition is sloped relative to the first partition, such that the injection chamber tapers with increasing distance from the injector port.

13. An injection section in accordance with claim 1 , further comprising a perforated, third partition, through which the exhaust gas flow can flow, is provided, which is arranged downstream of the second partition relative to the exhaust gas flow.

14. A catalytic converter device for an exhaust system of an internal combustion engine, the catalytic converter device comprising:
a tubular housing for guiding an exhaust gas flow, the tubular housing having an outlet section;
a selective catalytic reduction (SCR) catalytic converter in the outlet section; and
an injection section comprising:
a channel for guiding an exhaust gas flow;
an injector port arranged laterally on the channel and to which an injector can be connected for introducing a liquid or gas into the exhaust gas flow;
an injection chamber, which is formed in the channel in an area of the injector port, the injection chamber being defined by a perforated first partition, arranged in the channel upstream of the injector port relative to the exhaust gas flow and through which the exhaust gas flow can flow, and also a perforated second partition, arranged in the channel downstream of the injector port in relation to the exhaust gas flow and through which the exhaust gas flow can flow, wherein:
one perforation portion of the first partition generates at least two partial exhaust gas flows, which form two mutually opposite flow swirls, during a flow through the first partition within the injection chamber, one of the two mutually opposite flow swirls moving in a first flow direction, another one of the two mutually opposite flow swirls moving in a second flow direction, the first flow direction being opposite the second flow direction, wherein the one of the two mutually opposite flow swirls is laterally adjacent to the another one of the two mutually opposite flow swirls;
the two partial exhaust gas flows flow separately proximally to a channel wall, defining the injection chamber laterally, and flow together distally from the channel wall; and
the injection section is arranged upstream of the SCR catalytic converter relative to the exhaust gas flow.

15. A catalytic converter device in accordance with claim 14 , wherein the channel of the injection section forms a separate section of the tubular housing of the catalytic converter device.

16. A catalytic converter device in accordance with claim 14 , further comprising an oxidation catalytic converter, wherein the tubular housing has an inlet section, which contains an oxidation catalytic converter upstream of the injection section relative to the exhaust gas flow.

17. A catalytic converter device in accordance with claim 15 , further comprising an oxidation catalytic converter, wherein the tubular housing has an inlet section, which contains an oxidation catalytic converter upstream of the injection section relative to the exhaust gas flow.

18. An injection section in accordance with claim 14 , wherein for generating the flow swirls, the perforation portion of the first partition has first openings, which are arranged proximally to the channel wall and which has a discharge area each facing away from the injector port in the injection chamber.

19. An injection section of an exhaust system for an internal combustion engine, the injection section comprising:
a channel for guiding an exhaust gas flow;

Assignees

• Eberspaecher Exhaust Tech Gmbh

Inventors

• Ferront Herve
• Cazeneuve Laurent
• Többen Heike
• Rilly Sophie
• Wolf Tobias
• Kermorvant Sophie

Classifications

• F01N13/0097

  the purifying devices are arranged in a single housing · CPC title

• F01N2490/08

  Two or more expansion chambers in series separated by apertured walls only · CPC title

• F01N3/2892 Primary

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

• Y02T10/24

  Cross-Sectional Technologies · mapped topic

• F01N2610/02

  the substance being ammonia or urea · CPC title