Injector for a urea-water solution

Abstract

An injector for a urea-water solution includes at least a main body with a fitting for the urea-water solution, a valve with a valve drive and a separate feed pipe for the urea-water solution. The separate feed pipe extends at least partly through the main body.

1 . An injector for a urea-water solution, the injector comprising:
 a main body having a fitting for the urea-water solution; and   a valve having a valve drive and a separate feed pipe for the urea-water solution, said separate feed pipe extending at least partly through said main body.   
     
     
         2 . The injector according to  claim 1 , which further comprises a nozzle plate in which said separate feed pipe ends. 
     
     
         3 . The injector according to  claim 2 , wherein said nozzle plate has at least a plurality of nozzle orifices. 
     
     
         4 . The injector according to  claim 2 , wherein said nozzle plate forms a protruding end of said separate feed pipe. 
     
     
         5 . The injector according to  claim 1 , wherein said main body includes a cooling system having an inlet, an outlet and at least one cooling duct extending through said main body and being partly penetrated by said separate feed pipe. 
     
     
         6 . The injector according to  claim 1 , wherein said main body forms a reservoir for the urea-water solution adjacent said valve, and said valve is disposed movably relative to said reservoir. 
     
     
         7 . The injector according to  claim 1 , wherein said main body forms a reservoir for the urea-water solution adjacent said valve, and said valve includes a plurality of intake pipes opening into said reservoir. 
     
     
         8 . The injector according to  claim 1 , which further comprises at least one spring element biasing said valve against said main body. 
     
     
         9 . The injector according to  claim 1 , which further comprises a base with a socket for said main body, and air-gap insulation formed between said base and said main body in a region around a part of said separate feed pipe. 
     
     
         10 . The injector according to  claim 9 , which further comprises at least one spacer disposed in said air-gap insulation. 
     
     
         11 . The injector according to  claim 1 , wherein said fitting for the urea-water solution has a closable exit.