초록 ▼

An exhaust aftertreatment device has a diffuser upstream of an aftertreatment element such as a catalyst element or a filter element such as a diesel particulate filter. The diffuser de-focuses centralized velocity force flow against the aftertreatment element from the inlet in a space efficient and

An exhaust aftertreatment device has a diffuser upstream of an aftertreatment element such as a catalyst element or a filter element such as a diesel particulate filter. The diffuser de-focuses centralized velocity force flow against the aftertreatment element from the inlet in a space efficient and flow efficient construction.

대표청구항 ▼

1. An exhaust aftertreatment device comprising: a housing extending axially 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; a diffuser in said housin

1. An exhaust aftertreatment device comprising: a housing extending axially 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; a diffuser in said housing de-focusing centralized velocity force flow against said aftertreatment element from said inlet, wherein said diffuser comprises a central axially extending cylindrical tube and a plurality of vanes extending radially outwardly from said tube and curved to impart a non-axial flow direction component, wherein a first portion of said exhaust from said inlet flows axially within said tube, and a second portion of said exhaust from said inlet flows along said vanes and is directed by the curving of said vanes along a non-axial flow component direction. 2. The exhaust aftertreatment device according to claim 1 wherein said second portion of said exhaust is an annulus concentrically surrounding said first portion of said exhaust. 3. The exhaust aftertreatment device according to claim 2 wherein said first portion of said exhaust flows from said inlet axially through said tube to said aftertreatment element. 4. The exhaust aftertreatment device according to claim 2 wherein said tube is perforated. 5. An exhaust aftertreatment device comprising a housing extending axially along an axis and having an upstream inlet for receiving said exhaust, and a downstream outlet for discharging said exhaust, an aftertreatment clement in said housing for treating said exhaust, said housing having a chamber extending axially between said inlet and said aftertreatment element, a diffuser in said housing comprising a perforated plate extending laterally across said chamber and having a first central area and a second surrounding area, said plate being perforated at both of said first and second areas, said second area having larger perforated holes than said first area.