Patent ID: 7328572
Filing Date: 2008-02-12
Classification: F01N,Y02T

Abstract:
1. An exhaust aftertreatment device comprising: a housing having an upstream inlet for receiving 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 between said injector and said aftertreatment element, said turbulator comprising a tube having a perforated star-plugged downstream end, wherein: said housing and said tube extend coaxially along an axis; said housing comprises an upstream housing section and an aftertreatment element housing section meeting at a junction; said injector has an injection tip in said upstream housing section, said injection tip being upstream of said junction; said aftertreatment element is in said aftertreatment housing section; said tube has an upstream segment, an intermediate segment, and a downstream segment; said upstream segment of said tube provides said upstream housing section; said intermediate segment of said tube extends axially through and into said aftertreatment housing section at said junction of said upstream and aftertreatment housing sections; said aftertreatment housing section has a sidewall spaced radially outwardly of said intermediate segment and said downstream segment of said tube by an annular gap therebetween; said downstream segment of said tube provides said perforated star-plugged downstream end; said downstream segment of said tube is axially spaced from said junction of said upstream and aftertreatment housing sections by said intermediate segment of said tube therebetween.