Perforated mixing pipe with swirler
AssigneeTenneco Automotive Operating Company Inc.
InventorsManoj K. Sampath, Joshua Hicks, Ryan A. Floyd
Life of this patent
Estimating the term…
Abstract
An aftertreatment system may include an exhaust pipe and a mixing pipe. The exhaust pipe receives exhaust gas from an engine. The mixing pipe is disposed in the exhaust pipe and may include a tubular portion and a plurality of blades extending from a longitudinal end of the tubular portion. The tubular portion may include a plurality of openings extending through inner and outer diametrical surfaces of the tubular portion. The tubular portion and the plurality of blades may define an integrally formed unitary body.
Claims23
An aftertreatment system comprising:
- an exhaust pipe receiving exhaust gas from an engine;
- and
- a mixing pipe disposed in the exhaust pipe and including a tubular portion and a plurality of blades extending from a longitudinal end of the tubular portion, the tubular portion including a plurality of openings extending through inner and outer surfaces of the tubular portion, each of the plurality of blades including a first end attached to the tubular portion and a second end that is spaced apart from the tubular portion and unattached to adjacent blades, the blades further including a first portion contiguously extending from and being shaped as the inner and outer surfaces of the tubular portion and a second portion extending downstream of the tubular portion and radially outward from the first portion, wherein each blade overlaps a portion of an adjacent blade as viewed from a direction where a longitudinal axis of the tubular portion appears as a point.
An aftertreatment system comprising:
- an exhaust pipe receiving exhaust gas from an engine;
- and
- a mixing pipe disposed in the exhaust pipe and including a tubular portion and a plurality of blades extending from the tubular portion, the tubular portion including a plurality of openings, the mixing pipe defining a first exhaust flow path flowing through at least one of the openings and a second exhaust flow path flowing outside of the tubular portion and between the blades, wherein each of the blades includes a first end attached to the tubular portion and a second end that is spaced apart from the tubular portion and unattached to adjacent blades, the blades extending radially outwardly from an inner surface of the tubular portion on a conically spiral path such that an upstream portion of each blade outwardly extends a lesser distance than a downstream portion of the same blade, all portions of the mixing pipe remaining clear of an interior volume defined by the inner surface of the tubular portion.
Dependencies are inferred from the claim text.