Exhaust aftertreatment device with flow diffuser
AssigneeFleetguard, Inc.
InventorsC. Raymond Cheng, Z. Gerald Liu, Randolph G. Zoran
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Abstract
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.
Claims5
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.
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.
Dependencies are inferred from the claim text.