Heated urea conduit arrangement for an exhaust-gas aftertreatment system for an internal combustion engine

Abstract

A heated urea conduit arrangement includes a hose conduit ( 3 ), which conducts an aqueous urea solution, and runs parallel to a hose conduit ( 4 ) carrying heating water. Both hose conduits ( 3, 4 ) are surrounded by another hose ( 5 ) that shrinks around them when heated.

1 . A heated urea conduit arrangement for an exhaust-gas aftertreatment system of an internal combustion engine, the arrangement comprising:
 a first hose conduit for conducting an aqueous urea solution;   a second hose conduit for conducting heated water;   said first and second hose conduits running side-by-side and parallel to each other; and,   a shrink hose surrounding said first and second hose conduits and said shrink hose being configured to shrink when heated thereby causing said first and second conduits to run in tight contact with each other thereby ensuring a good thermal transfer therebetween.   
   
   
       2 . The heated urea conduit arrangement of  claim 1 , wherein said shrink hose is made of a shrinkable, flexible fabric. 
   
   
       3 . The heated urea conduit arrangement of  claim 2 , wherein said fabric is a fabric coated with polyolefin. 
   
   
       4 . The heated urea conduit arrangement of  claim 1 , further comprising an insulating foam hose surrounding said shrink hose holding said first and second hose conduits.