Exhaust after-treatment assembly for engine system

Patent metadata

Field	Value
Publication number	US-9976460-B2
Application number	US-201615079536-A
Country	US
Kind code	B2
Filing date	Mar 24, 2016
Priority date	Mar 24, 2016
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

An exhaust after-treatment assembly for an engine system is provided. The exhaust after-treatment assembly includes a housing having an inlet port, an outlet port, a catalyst disposed within a cavity defined by the housing, and a muffler assembly disposed within the cavity downstream of the catalyst. The muffler assembly includes one or more baffle plates disposed longitudinally spaced from one another within the housing to define at least a first resonator chamber and a second resonator chamber. Each of the baffle plates defines an openings aligned to one another about a longitudinal axis of the housing. Further, a resonator tube extends through the openings of the baffle plates and includes an inlet, a perforated portion and one or more outlet ports formed in a wall of the resonator tube. The perforated portion and the outlet ports, respectively in fluid communication with the second resonator chamber and the first resonator chamber.

First claim

What is claimed is:

1. An exhaust after-treatment assembly for an engine system comprising:
a housing having an inlet port and an outlet port, said housing defining a cavity therein;
a catalyst disposed within a first portion of the cavity defined by the housing, the catalyst selected from a group consisting of a diesel oxidation catalyst, a nitrous oxide reduction catalyst, and a combination thereof;
a second portion of the cavity located downstream of the first portion, with the second portion configured to have one of a diesel particulate filter or a muffler assembly replaceably disposed therein,
the muffler assembly including:
one or more baffle plates disposed within the second portion of the cavity, the baffle plates being longitudinally spaced from one another to define at least a first resonator chamber and a second resonator chamber, each of the baffle plates further defining an opening aligned with one another about a longitudinal axis of the housing; and
a resonator tube extending through the opening of each of the baffle plates, the resonator tube having an inlet to receive exhaust gas exiting the catalyst, a perforated portion formed in a wall of the resonator tube in fluid communication with the second resonator chamber, and one or more outlet ports formed in the wall of the resonator tube in fluid communication with the first resonator chamber.

2. The exhaust after-treatment assembly of claim 1 , wherein the one or more baffle plates include a first baffle plate, a second baffle plate, and a third baffle plate.

3. The exhaust after-treatment assembly of claim 2 , wherein the first resonator chamber is defined between the first baffle plate and the second baffle plate, and the second resonator chamber is defined between the third baffle plate and the second baffle plate.

4. The exhaust after-treatment assembly of claim 2 , wherein the third baffle plate includes one or more apertures formed therein to facilitate discharge of exhaust gas from the second resonator chamber.

5. The exhaust after-treatment assembly of claim 1 , wherein the one or more baffle plates include a first baffle plate and a second baffle plate.

6. The exhaust after-treatment assembly of claim 5 , wherein the housing includes an end cap in close proximity to the outlet port of the housing, wherein the first resonator chamber is defined between the first baffle plate and the second baffle plate, and the second resonator chamber is defined between the end cap and the second baffle plate.

7. The exhaust after-treatment assembly of claim 1 , wherein the muffler assembly includes a plug member being inserted in an outlet formed at an end of the resonator tube.

8. The exhaust after-treatment assembly of claim 7 , wherein the plug member defines one or more ports, wherein the one or more ports include an axial port.

9. An engine system, the engine system comprising:
an engine;
an exhaust after-treatment assembly coupled to the engine and configured to treat the exhaust gases discharged from the engine, the exhaust after-treatment assembly including:
a housing having an inlet port and an outlet port;
a catalyst disposed within a cavity defined by the housing, the catalyst selected from a group consisting of a diesel oxidation catalyst, a nitrous oxide reduction catalyst, and a combination thereof;
one or more baffle plates disposed within the cavity of the housing and downstream of the catalyst, the baffle plates being longitudinally spaced from one another to define at least a first resonator chamber and a second resonator chamber, each of the baffle plates further defining an opening aligned with one another about a longitudinal axis of the housing; and
a resonator tube extending through the opening of each of the baffle plates, the resonator tube having an inlet to receive exhaust gas existing the catalyst, a perforated portion formed in a wall of the resonator tube in fluid communication with the second resonator chamber, and one or more outlet ports formed in the wall of the resonator tube in fluid communication with the first resonator chamber.

10. The exhaust after-treatment assembly of claim 9 , wherein the one or more baffle plates include a first baffle plate, a second baffle plate, and a third baffle plate.

11. The exhaust after-treatment assembly of claim 10 , wherein the first resonator chamber is defined between the first baffle plate and the second baffle plate, and the second resonator chamber is defined between the third baffle plate and the second baffle plate.

12. The exhaust after-treatment assembly of claim 10 , wherein the third baffle plate includes one or more apertures formed therein to facilitate discharge of exhaust gas from the second resonator chamber.

13. The exhaust after-treatment assembly of claim 9 , wherein the one or more baffle plates include a first baffle plate and a second baffle plate.

14. The exhaust after-treatment assembly of claim 13 , wherein the housing includes an end cap in close proximity to the outlet port of the housing, wherein the first resonator chamber is defined between the first baffle plate and the second baffle plate, and the second resonator chamber is defined between the end cap and the second baffle plate.

15. The exhaust after-treatment assembly of claim 9 , wherein a plug member is inserted in an outlet formed at an end of the resonator tube.

16. The exhaust after-treatment assembly of claim 9 , wherein the catalyst includes a diesel oxidation catalyst.

Assignees

• Caterpillar Inc

Inventors

• Khan Faiz M I

Classifications

• F01N1/083

  using transversal baffles defining a tortuous path for the exhaust gases or successively throttling exhaust gas flow · CPC title

• F01N2450/40

  Retrofitting exhaust apparatus · CPC title

• F01N1/026

  Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage · CPC title

• F01N3/2885

  with exhaust silencers in a single housing · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title