Reductant delivery system for exhaust gas aftertreatment system

Abstract

A reductant delivery system includes: an inlet body including: an inlet body coupler surrounding an inlet body inlet that is configured to receive exhaust gas, an inlet body outer transfer shell coupled to the inlet body coupler, the inlet body outer transfer shell including: an inlet body outer transfer shell inner surface, and an inlet body outer transfer shell outlet extending through the inlet body outer transfer shell inner surface, an inlet body outer mounting shell coupled to the inlet body coupler and the inlet body outer transfer shell, the inlet body outer mounting shell and the inlet body outer transfer shell defining an inlet body cavity, the inlet body outer mounting shell; an outlet body comprising: an outlet body coupler, and an outlet body shell; and an outer transfer tube.

What is claimed is: 
     
         1 . A reductant delivery system comprising:
 an inlet body comprising:
 an inlet body coupler surrounding an inlet body inlet that is configured to receive exhaust gas, 
 an inlet body outer transfer shell coupled to the inlet body coupler, the inlet body outer transfer shell comprising:
 an inlet body outer transfer shell inner surface, and 
 an inlet body outer transfer shell outlet extending through the inlet body outer transfer shell inner surface, 
 
 an inlet body outer mounting shell coupled to the inlet body coupler and the inlet body outer transfer shell, the inlet body outer mounting shell and the inlet body outer transfer shell defining an inlet body cavity, the inlet body outer mounting shell comprising an inlet body outer mounting shell inner surface, and 
 an inlet body inner shell contained within the inlet body cavity, the inlet body inner shell separated from the inlet body outer mounting shell inner surface; 
   an outlet body comprising:
 an outlet body coupler surrounding an outlet body outlet that is configured to provide the exhaust gas, and 
 an outlet body shell coupled to the outlet body coupler, the outlet body shell comprising an outlet body shell inlet; and 
   an outer transfer tube coupled to the inlet body outer transfer shell around the inlet body outer transfer shell outlet and coupled to the outlet body shell around the outlet body shell inlet.   
     
     
         2 . The reductant delivery system of  claim 1 , further comprising:
 an inner transfer tube positioned within and spaced apart from the outer transfer tube;   wherein the inlet body inner shell comprises an inlet body inner shell wall;   wherein the inlet body inner shell comprises an inlet body inner shell outlet extending through the inlet body inner shell wall; and   wherein the inner transfer tube is coupled to the inlet body inner shell wall around the inlet body inner shell outlet.   
     
     
         3 . The reductant delivery system of any one of  claim 1 , wherein:
 the inlet body inner shell comprises an inlet body inner shell wall; and   the inlet body further comprises a dividing plate at least partially contained within the inlet body inner shell wall.   
     
     
         4 . The reductant delivery system of  claim 3 , wherein:
 the dividing plate includes a dividing plate opening that is configured to receive the exhaust gas from the inlet body inlet;   the inlet body inner shell further comprises an inlet body inner shell endcap surface contiguous with the inlet body inner shell wall and separated from the inlet body outer mounting shell inner surface;   the inlet body further comprises a distributor tube comprising:
 a distributor tube first end coupled to the dividing plate around the dividing plate opening, and 
 a distributor tube second end coupled to the inlet body inner shell endcap surface. 
   
     
     
         5 . The reductant delivery system of  claim 4 , wherein the distributor tube further comprises a plurality of distributor tube apertures, each of the distributor tube apertures being configured to facilitate passage of the exhaust gas from the distributor tube out of the distributor tube and to a region between the dividing plate, the distributor tube, the inlet body inner shell wall, and the inlet body inner shell endcap surface. 
     
     
         6 . The reductant delivery system of  claim 1 , wherein the inlet body outer mounting shell further comprises:
 an inlet body outer mounting shell dividing surface contiguous with the inlet body outer mounting shell inner surface and extending from the inlet body outer mounting shell inner surface towards the inlet body inner shell;   an inlet body outer mounting shell projecting surface contiguous with the inlet body outer mounting shell dividing surface and the inlet body outer mounting shell inner surface; and   an injection aperture extending through the inlet body outer mounting shell dividing surface.   
     
     
         7 . The reductant delivery system of  claim 6 , wherein:
 the inlet body further comprises a shroud assembly comprising:
 a shroud flange coupled to the inlet body outer mounting shell projecting surface partially around the injection aperture, and 
 a shroud plate coupled to the shroud flange; 
   a shroud inlet is defined between the shroud flange, the shroud plate, and at least one of the inlet body outer mounting shell inner surface and the inlet body outer mounting shell projecting surface; and   a shroud outlet is defined between the shroud flange and the shroud plate, the shroud outlet located over the injection aperture.   
     
     
         8 . The reductant delivery system of  claim 6 , further comprising:
 a dosing module configured to receive reductant; and   an injection mount coupled to the dosing module;   wherein the inlet body outer mounting shell further comprises an inlet body outer mounting shell outer mounting surface opposite the inlet body outer mounting shell projecting surface;   wherein the injection aperture is disposed in the inlet body outer mounting shell outer mounting surface and extends through the inlet body outer mounting shell outer mounting surface; and   wherein the injection mount is coupled to the inlet body outer mounting shell outer mounting surface around the injection aperture.   
     
     
         9 . The reductant delivery system of  claim 2 , wherein:
 the inlet body inlet is disposed along an inlet body inlet plane;   the inlet body, the outlet body, and the outer transfer tube are bisected by a reductant delivery system body bisecting plane that is orthogonal to the inlet body inlet plane and intersects an inlet body inlet center point defining the inlet body inlet;   the inner transfer tube comprises:
 an inner transfer tube curved portion, and 
 an inner transfer tube straight portion contiguous with the inner transfer tube curved portion; 
   the inner transfer tube straight portion is centered on an inner transfer tube center axis; and   the inner transfer tube center axis is angularly separated from the reductant delivery system body bisecting plane by less than 50 degrees when measured along a plane parallel to the inlet body inlet plane.   
     
     
         10 . The reductant delivery system of  claim 9 , wherein the inlet body is coupled to the outlet body only through the outer transfer tube. 
     
     
         11 . A reductant delivery system comprising:
 an inlet body comprising:
 an inlet body coupler surrounding an inlet body inlet that is configured to receive exhaust gas, 
 an inlet body outer transfer shell coupled to the inlet body coupler, the inlet body outer transfer shell comprising:
 an inlet body outer transfer shell inner surface, and 
 an inlet body outer transfer shell outlet extending through the inlet body outer transfer shell inner surface, 
 
 an inlet body outer mounting shell coupled to the inlet body coupler and the inlet body outer transfer shell, the inlet body outer mounting shell and the inlet body outer transfer shell defining an inlet body cavity, the inlet body outer mounting shell comprising an inlet body outer mounting shell inner surface, 
 an inlet body inner shell contained within the inlet body cavity, the inlet body inner shell separated from the inlet body outer mounting shell inner surface, the inlet body inner shell comprising:
 an inlet body inner shell wall, and 
 an inlet body inner shell endcap surface contiguous with the inlet body inner shell wall and separated from the inlet body outer mounting shell inner surface, and 
 
 a distributor tube comprising:
 a distributor tube first end, 
 a distributor tube second end coupled to the inlet body inner shell endcap surface, and 
 a plurality of distributor tube apertures, each of the distributor tube apertures being configured to facilitate passage of the exhaust gas from the distributor tube out of the distributor tube and to a region; 
 
   an outlet body comprising an outlet body coupler surrounding an outlet body outlet that is configured to provide the exhaust gas; and   a dividing plate at least partially contained within the inlet body inner shell wall, the dividing plate includes a dividing plate opening that is configured to receive the exhaust gas from the inlet body inlet;   wherein the distributor tube first end is coupled to the dividing plate around the dividing plate opening; and   wherein the region is between the dividing plate, the distributor tube, the inlet body inner shell wall, and the inlet body inner shell endcap surface.   
     
     
         12 . The reductant delivery system of  claim 11 , wherein the outlet body further comprises an outlet body shell coupled to the outlet body coupler, the outlet body shell comprising an outlet body shell inlet. 
     
     
         13 . The reductant delivery system of  claim 12 , further comprising:
 an inner transfer tube coupled to the inlet body outer transfer shell around the inlet body outer transfer shell outlet and coupled to the outlet body shell around the outlet body shell inlet;   wherein the inlet body inner shell comprises an inlet body inner shell outlet extending through the inlet body inner shell wall; and   wherein the inner transfer tube is coupled to the inlet body inner shell wall around the inlet body inner shell outlet.   
     
     
         14 . The reductant delivery system of  claim 13 , wherein the outlet body further comprises a flow guide extending within the outlet body shell towards the inner transfer tube, the flow guide coupled to at least one of the outlet body shell and the inner transfer tube. 
     
     
         15 . The reductant delivery system of  claim 11 , wherein the inlet body outer mounting shell further comprises:
 an inlet body outer mounting shell dividing surface contiguous with the inlet body outer mounting shell inner surface and extending from the inlet body outer mounting shell inner surface towards the inlet body inner shell;   an inlet body outer mounting shell projecting surface contiguous with the inlet body outer mounting shell dividing surface and the inlet body outer mounting shell inner surface; and   an injection aperture extending through the inlet body outer mounting shell dividing surface.   
     
     
         16 . The reductant delivery system of  claim 15 , wherein:
 the inlet body further comprises a shroud assembly comprising:
 a shroud flange coupled to the inlet body outer mounting shell projecting surface partially around the injection aperture, and 
 a shroud plate coupled to the shroud flange; 
   a shroud inlet is defined between the shroud flange, the shroud plate, and at least one of the inlet body outer mounting shell inner surface and the inlet body outer mounting shell projecting surface; and   a shroud outlet is defined between the shroud flange and the shroud plate, the shroud outlet located over the injection aperture.   
     
     
         17 . The reductant delivery system of  claim 15 , further comprising:
 a dosing module configured to receive reductant; and   an injection mount coupled to the dosing module;   wherein the inlet body outer mounting shell further comprises an inlet body outer mounting shell outer mounting surface opposite the inlet body outer mounting shell projecting surface;   wherein the injection aperture is disposed in the inlet body outer mounting shell outer mounting surface and extends through the inlet body outer mounting shell outer mounting surface; and   wherein the injection mount is coupled to the inlet body outer mounting shell outer mounting surface around the injection aperture.   
     
     
         18 . The reductant delivery system of  claim 13 , wherein:
 the inlet body inlet is disposed along an inlet body inlet plane;   the inlet body, the outlet body, and an outer transfer tube are bisected by a reductant delivery system body bisecting plane that is orthogonal to the inlet body inlet plane and intersects an inlet body inlet center point defining the inlet body inlet;   the inner transfer tube comprises:
 an inner transfer tube curved portion, and 
 an inner transfer tube straight portion contiguous with the inner transfer tube curved portion; 
   the inner transfer tube straight portion is centered on an inner transfer tube center axis; and   the inner transfer tube center axis is angularly separated from the reductant delivery system body bisecting plane by less than 50 degrees when measured along a plane parallel to the inlet body inlet plane.   
     
     
         19 . The reductant delivery system of  claim 18 , wherein the inlet body is coupled to the outlet body only through the outer transfer tube. 
     
     
         20 . The reductant delivery system of  claim 11 , wherein the inlet body inner shell further comprises a plurality of inlet body inner shell apertures disposed on the inlet body inner shell endcap surface around the distributor tube, each of the inlet body inner shell apertures configured to facilitate passage of the exhaust gas from at least one of:
 between the inlet body inner shell and the inlet body outer mounting shell into the inlet body inner shell, and   between the inlet body inner shell and the inlet body outer transfer shell into the inlet body inner shell.