Back to results
US 6,722,123 B2Granted
Exhaust aftertreatment device, including chemical mixing and acoustic effects
AssigneeFleetguard, Inc.
InventorsZ. Gerald Liu, Michael T. Zuroski, Cary D. Bremigan, Kenneth J. Kicinski, C. Raymond Cheng
Life of this patent
Estimating the term…
Abstract
An exhaust aftertreatment device (10) includes an aftertreatment element (24) for treating internal combustion engine exhaust, an injector (26) for injecting chemical species mixing with the exhaust prior to reaching the aftertreatment element, and a turbulator (36) turbulating the exhaust to enhance the noted mixing. In a desired combination, a two-stage integrated perforated tube combination structure includes a turbulent mixing tube (38) disposed in an acoustic tube (40) and concentrically surrounded thereby.
Claims16
An exhaust aftertreatment device comprising:
- a housing extending along an axis and having an upstream inlet for receiving said exhaust, and a downstream outlet for discharging said exhaust;
- an aftertreatment element in said housing for treating said exhaust;
- an injector in said housing upstream of said aftertreatment element and injecting chemical species mixing with said exhaust prior to reaching said aftertreatment element;
- a turbulator in said housing upstream of said aftertreatment element and turbulating said exhaust to enhance said mixing upstream of said aftertreatment element, wherein said turbulator comprises a perforated mixing tube having an upstream side facing said injector, and a downstream side facing said aftertreatment element, and wherein said perforated mixing tube has a plurality of perforation holes extending therethrough from said upstream side to said downstream side, and wherein exhaust passes through said perforation holes from said upstream side to said downstream side, wherein said perforated mixing tube has square perforation holes.
1 more element
An exhaust aftertreatment device comprising:
- a housing extending along an axis and having an upstream inlet for receiving said exhaust, and a downstream outlet for discharging said exhaust;
- an aftertreatment element in said housing for treating said exhaust;
- an injector in said housing upstream of said aftertreatment element and injecting chemical species mixing with said exhaust prior to reaching said aftertreatment element;
- a turbulator in said housing upstream of said aftertreatment element and turbulating said exhaust to enhance said mixing upstream of said aftertreatment element,
- wherein, said injector injects said chemical species along a spray pattern having an injection boundary, and comprising a screen extending from said injector along said injection boundary, and said turbulator comprises a mixing tube having a conical shape pointing downstream, and said screen has a conical shape pointing upstream.
2 more elements
An exhaust aftertreatment device comprising:
- a housing extending along an axis and having an upstream inlet for receiving said exhaust, and a downstream outlet for discharging said exhaust;
- an aftertreatment element in said housing for treating said exhaust;
- an injector in said housing upstream of said aftertreatment element and injecting chemical species mixing with said exhaust prior to reaching said aftertreatment element;
- a turbulator in said housing upstream of said aftertreatment element and turbulating said exhaust to enhance said mixing upstream of said aftertreatment element, wherein said turbulator comprises a perforated mixing tube having an upstream side facing said injector, and a downstream side facing said aftertreatment element, and wherein said perforated mixing tube has a plurality of perforation holes extending therethrough from said upstream side to said downstream side, and wherein exhaust passes through said perforation holes from said upstream side to said downstream side, and comprising a spherical screen around said injector and extending therefrom.
1 more element
An exhaust device comprising:
- a housing extending along an axis and having an upstream inlet for receiving said exhaust, and a downstream outlet for discharging said exhaust;
- an injector in said housing for injecting chemical species mixing with said exhaust;
- a turbulent mixing tube in said housing turbulating said exhaust and enhancing said mixing, said mixing tube having an upstream side and a downstream side and a plurality of perforation holes extending therethrough from said upstream side to said downstream side, wherein exhaust passes through said perforation holes from said upstream side to said downstream side;
- an acoustic tube in said housing quieting said exhaust, said acoustic tube having an upstream side and a downstream side and a plurality of perforation holes extending therethrough from said upstream side to said downstream side, and wherein exhaust passes through said perforation holes of said acoustic tube from its upstream side to its downstream side, and wherein exhaust passes serially through said perforation holes of said mixing tube and said perforation holes of said acoustic tube.
1 more element
Dependencies are inferred from the claim text.