Engine exhaust system with water entrapment

Abstract

The present disclosure relates to an exhaust treatment system including a muffler body having a water collection reservoir defined between inner and outer walls of the muffler body. The present disclosure also relates to a vertical muffler having an outlet pipe and a baffle for stabilizing the outlet pipe within the muffler. The baffle includes an integral necked portion that fits within a lower end of the outlet pipe. A water collection region is defined between the necked portion and an inner surface of the outlet pipe.

1 . A muffler comprising: 
 a muffler body including an outlet having an outlet flange;    an aftertreatment device mounted within the muffler body; and    the muffler body including inner and outer walls defining an annular water capturing space located adjacent the outlet flange.    
   
   
       2 . The muffler of  claim 1 , wherein the inner wall bends outwardly to close a lower end of the annular water capturing space.  
   
   
       3 . The muffler of  claim 2 , wherein the outer wall defines a drain hole for draining water that collects within the annular water capturing space.  
   
   
       4 . An exhaust system comprising: 
 a muffler body including an outlet having an outlet flange;    an aftertreatment device mounted within the muffler body;    the muffler body including inner and outer walls defining an annular water capturing space located adjacent the outlet flange; and    a stack mounted to the outlet flange.    
   
   
       5 . The exhaust system of  claim 4 , wherein the stack includes a diameter reduced positioned above the water collecting space.  
   
   
       6 . The exhaust system of  claim 4 , wherein the stack includes a jog providing a stack offset distance equal to at least about one diameter of the stack.  
   
   
       7 . The exhaust system of  claim 4 , wherein a top end of the stack is curved at least one third a diameter of the stack.  
   
   
       8 . The exhaust system of  claim 4 , wherein a top end of the stack includes a mitre cut.  
   
   
       9 . A muffler comprising: 
 a muffler body having an inlet and an outlet;    an outlet pipe positioned at the outlet of the muffler body, the outlet pipe including an upper end and a lower end;    an aftertreatment device mounted within the muffler body beneath the lower end of the outlet pipe; and    a baffle for stabilizing the lower end of the outlet pipe within the muffler body, the baffle including an integral inwardly necked portion that fits into the lower end of the outlet pipe, the inwardly necked portion defining an interior exhaust flow opening positioned within the outlet pipe, the inwardly necked portion also defining an annular water collection region positioned between the necked portion and an inner surface of the outlet pipe.    
   
   
       10 . The muffler of  claim 9 , wherein the baffle includes an annular main body that extends outwardly and downwardly from the lower end of the outlet pipe.  
   
   
       11 . The muffler according to  claim 9 , wherein the lower end of the outlet pipe defines a drain opening that allows water to drain from the water collection region to a location outside the outlet pipe.  
   
   
       12 . The muffler according to  claim 11 , wherein the drain opening is defined by a slot at the lower end of the outlet pipe.  
   
   
       13 . The muffler according to  claim 12 , wherein a plurality of slots are defined at the lower end of the outlet pipe.  
   
   
       14 . The muffler according to  claim 9 , wherein the muffler body includes an inner wall and an outer wall, and wherein the baffle includes an outer lip that spaces the inner wall from the outer wall.  
   
   
       15 . The muffler according to  claim 14 , wherein water from the water collection region drains outwardly along a top side of the baffle and collects at an annular water collection channel defined by the outer lip of the baffle, the annular water collection channel being positioned between the inner and outer walls of the muffler body.  
   
   
       16 . A muffler comprising: 
 a muffler body having an inlet and an outlet, the muffler body including an inner wall and an outer wall;    an outlet pipe positioned at the outlet of the muffler body, the outlet pipe including an upper end and a lower end;    an aftertreatment device mounted within the muffler body beneath the lower end of the outlet pipe; and    a one-piece baffle for stabilizing the lower end of the outlet pipe within the muffler body, the baffle including an inwardly necked portion that fits into the lower end of the outlet pipe, the inwardly necked portion defining an interior exhaust flow opening positioned within the outlet pipe, the inwardly necked portion also defining an annular water collection region positioned between the necked portion and an inner surface of the outlet pipe, the baffle also including an outer spacer portion that fits between the inner and outer walls of the muffler body.    
   
   
       17 . The muffler of  claim 16 , wherein the spacer defines an annular water collection channel positioned between the inner and outer walls.  
   
   
       18 . The muffler of  claim 16 , wherein the baffle includes an annular main body that extends outwardly and downwardly from the upwardly necked portion to the outer spacer portion.  
   
   
       19 . The muffler of  claim 18 , wherein the lower end of the outlet pipe defines a drain opening that allows water to drain from the water collection region to a top surface of the annular main body of the baffle.  
   
   
       20 . The muffler of  claim 19 , wherein the outer spacer portion defines an outer water collection channel for collecting water that runs down the top surface of the annular main body of the baffle.