Aftertreatment system and mixing tube
AssigneeCaterpillar Inc.
InventorsLance Clay Barke, Douglas T. Scott, Collin P. Hecker, Andrew Michael Denis
Life of this patent
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Abstract
An aftertreatment mixing tube includes a mixing tube body having an exhaust inlet located in a first tube end, an exhaust outlet including a plurality of perforations located in a second tube end, and an inner tube surface circumferentially extending around a center axis forming an exhaust passage. The mixing tube further includes a plurality of exhaust impingement surfaces serially arranged in the exhaust passage, each exposed to a flow of exhaust through the exhaust passage and oriented to deflect exhaust in radial directions, and a diesel exhaust fluid (DEF) injection port positioned proximate to the first tube end.
Claims20
An exhaust system comprising:
- a housing;
- a mixing tube located at least partially in the housing and including an exhaust inlet located in a first tube end, an exhaust outlet located in a second tube end, an inner tube surface circumferentially extending around a center axis and forming an exhaust passage to receive a flow of exhaust, and a diesel exhaust fluid (DEF) injection port to inject DEF;
- the mixing tube further including, in the exhaust passage, a first exhaust impingement element oriented to deflect exhaust and injected DEF in a first radial direction, a second exhaust impingement element oriented to deflect exhaust and injected DEF in a second radial direction opposite to the first radial direction, and a third exhaust impingement element oriented to deflect exhaust and injected DEF in the first radial direction;
- a diesel exhaust fluid (DEF) injector arranged to inject DEF through the DEF injection port;
- and
- a first catalyst bank and a second catalyst bank coupled to the mixing tube, and the mixing tube is supported in the housing laterally between the first catalyst bank and the second catalyst bank.
(canceled)
An aftertreatment mixing tube comprising:
- a mixing tube body defining a center axis and having an exhaust inlet located in a first tube end, an exhaust outlet located in a second tube end, and an inner tube surface circumferentially extending around a center axis and forming an exhaust passage;
- the mixing tube body further including, arranged in series between the exhaust inlet and the exhaust outlet, a first exhaust impingement surface, a second exhaust impingement surface having an inner edge defining a central opening, and an outer edge, and the second exhaust impingement surface extends from the inner edge to the outer edge, and a third exhaust impingement surface, each of the first, the second, and the third exhaust impingement surfaces being exposed to a flow of exhaust through the exhaust passage;
- and
- the first exhaust impingement surface is oriented to deflect exhaust in a first radial direction toward the center axis, the second exhaust impingement surface is oriented to deflect exhaust in a second radial direction opposite to the first radial direction and away from the center axis, and the third exhaust impingement surface is oriented to deflect exhaust in the first radial direction.
An aftertreatment mixing tube comprising:
- a mixing tube body having an exhaust inlet located in a first tube end, an exhaust outlet located in a second tube end, an outer tube surface, and an inner tube surface circumferentially extending around a center axis forming an exhaust passage;
- the exhaust outlet including a plurality of perforations formed in the mixing tube body extending from the outer tube surface to the inner tube surface;
- a plurality of exhaust impingement surfaces including three or more axially spaced exhaust impingement surfaces serially arranged in the exhaust passage, each exposed to a flow of exhaust through the exhaust passage and oriented to deflect exhaust in radial directions;
- and
- a diesel exhaust fluid (DEF) injection port positioned proximate to the first tube end;
- wherein one of the plurality of exhaust impingement surfaces includes an upstream converger located radially outward in the exhaust passage.
(canceled)
Dependencies are inferred from the claim text.