A flow distribution plate and an engine exhaust gas aftertreatment device comprising such a plate

Abstract

The invention relates to a flow distribution plate associated with an engine exhaust gas aftertreatment device, wherein the plate is perforated and is adapted to be arranged at an inlet to an exhaust gas purifying unit to improve the flow distribution of exhaust gas into the purifying unit. The flow distribution plate is curved in relation to the inlet, such that a more uniform flow velocity distribution is achieved over the inlet. The invention also relates to an engine exhaust gas aftertreatment device and a vehicle comprising such an engine exhaust gas aftertreatment device.

1 . A flow distribution plate associated with an engine exhaust gas aftertreatment device, wherein the plate is perforated and is adapted to be arranged at an inlet to an exhaust gas purifying unit to improve the flow distribution of exhaust gas into the purifying unit, wherein the flow distribution plate is curved in relation to the inlet, such that a more uniform flow velocity distribution is achieved over the inlet, wherein the curvature of the flow distribution plate is asymmetric and formed depending on the direction of the inflow of exhaust gas in relation to the inlet, wherein the flow distribution plate is curved such that the incoming exhaust gas with the highest flow velocity hits a part of the flow distribution plate, which is furthest away from the inlet to the purifying unit. 
     
     
         2 . The plate according to  claim 1 , wherein the perforations of the flow distribution plate are of essentially equal size. 
     
     
         3 . The plate according to  claim 1 , wherein the perforations of the flow distribution plate are evenly distributed over the surface of the plate. 
     
     
         4 . The plate according to  claim 1 , wherein the plate comprises an essentially convex portion in relation to the inlet. 
     
     
         5 . An engine exhaust gas aftertreatment device, comprising at least one exhaust gas purifying unit with an inlet, wherein a flow distribution plate is arranged at the inlet of the purifying unit, wherein said flow distribution plate wherein the plate is perforated and is adapted to be arranged at an inlet to an exhaust gas purifying unit to improve the flow distribution of exhaust gas into the purifying unit, wherein the flow distribution plate is curved in relation to the inlet, such that a more uniform flow velocity distribution is achieved over the inlet, wherein the curvature of the flow distribution plate is asymmetric and formed depending on the direction of the inflow of exhaust gas in relation to the inlet, wherein the flow distribution plate is curved such that the incoming exhaust gas with the highest flow velocity hits a part of the flow distribution plate, which is furthest away from the inlet to the purifying unit. 
     
     
         6 . The device according to  claim 7 , wherein the purifying unit is a selective catalytic reaction catalyst. 
     
     
         7 . The device according to  claim 5 , wherein the device is adapted to be integrated with a silencer of a vehicle. 
     
     
         8 . The device according to  claim 5 , wherein the device is configured such that the inflow of exhaust gas to the inlet is essentially parallel with the plane of the inlet. 
     
     
         9 . The device according to  claim 5 , wherein the device is configured such that the inflow of exhaust gas to the inlet is directed with an angle in relation to the plane of the inlet, wherein the angle is between 0-80 degrees. 
     
     
         10 . A vehicle comprising an engine exhaust gas aftertreatment device comprising at least one exhaust gas purifying unit with an inlet, wherein a flow distribution plate is arranged at the inlet of the purifying unit, wherein said flow distribution plate wherein the plate is perforated and is adapted to be arranged at an inlet to an exhaust gas purifying unit to improve the flow distribution of exhaust gas into the purifying unit, wherein the flow distribution plate is curved in relation to the inlet, such that a more uniform flow velocity distribution is achieved over the inlet, wherein the curvature of the flow distribution plate is asymmetric and formed depending on the direction of the inflow of exhaust gas in relation to the inlet, wherein the flow distribution plate is curved such that the incoming exhaust qas with the highest flow velocity hits a part of the flow distribution plate, which is furthest away from the inlet to the purifying unit. 
     
     
         11 . The vehicle according to  claim 10 , wherein the purifying unit is a selective catalytic reaction catalyst. 
     
     
         12 . The vehicle according to  claim 10 , wherein the device is adapted to be integrated with a silencer of a vehicle. 
     
     
         13 . The vehicle according to  claim 10 , wherein the device is configured such that the inflow of exhaust gas to the inlet is essentially parallel with the plane of the inlet. 
     
     
         14 . The vehicle according to  claim 10 , wherein the device is configured such that the inflow of exhaust gas to the inlet is directed with an angle in relation to the plane of the inlet, wherein the angle is between 0-80 degrees. 
     
     
         15 . The plate according to  claim 1 , wherein the plate comprises an essentially concave portion in relation to the inlet.