Patent ID: 8935918
Filing Date: 2015-01-20
Classification: B01F,F01N

Abstract:
1. A mixer for an exhaust aftertreatment system, comprising: a body portion that is configured to be disposed in an exhaust conduit of an exhaust aftertreatment system upstream of an exhaust aftertreatment device, the mixer body portion comprising a band having a plurality of radially-extending, circumferentially-spaced lobes about a mixer axis; and an airfoil portion comprising a two-way shape memory alloy, the airfoil portion disposed on the body portion and reversibly movable between a deployed position and a retracted position, the airfoil portion comprising a plurality of movable fingers axially-extending from the band and configured for movement between the deployed position and the retracted position, wherein in the deployed position the airfoil portion is oriented within an exhaust gas flow at an acute angle relative to the band and a flow direction of the exhaust gas flow and provides a deployed resistance to the exhaust gas flow, and in the retracted position the airfoil portion is oriented axially to the band and the flow direction of the exhaust gas flow and provides a retracted resistance, and the deployed resistance is greater than the retracted resistance, wherein the band further includes a plurality of inwardly projecting sections configured to enable exhaust gas to pass between the exhaust conduit and the band, wherein each inwardly projecting section is oriented between a pair of the circumferentially-spaced lobes.