Suction jet pump and method for producing a nozzle for a suction jet pump

Abstract

A suction jet pump provided for the conveyance of fuel in a fuel tank has a separate nozzle insert with a nozzle duct. The nozzle insert can be produced both from plastic by the injection-molding method or from metal. By virtue of the smaller component size in the case of plastic or due to the choice of metal as material for the nozzle insert, the nozzle duct can be provided with a particularly small diameter. The suction jet pump has a particularly low propellant consumption.

What is claimed is:  
     
         1 . A suction jet pump for the conveyance of fuel in a fuel tank, comprising: 
 a nozzle arranged upstream of a mixing tube and configured for connection to a propellant line; and    a nozzle duct, wherein 
 the nozzle has a nozzle insert in the region of the nozzle duct.  
   
     
     
         2 . The suction jet pump as claimed in  claim 1 , wherein the nozzle insert consists of plastic.  
     
     
         3 . The suction jet pump as claimed in  claim 1 , wherein the nozzle insert consists of a metal.  
     
     
         4 . The suction jet pump as claimed in  claim 1 , wherein the nozzle has a nozzle casing with a connection for the propellant line, and the nozzle casing is configured for holding the nozzle insert.  
     
     
         5 . The suction jet pump as claimed in  claim 1 , wherein the nozzle insert is of bowl-shaped design and engages over an edge of the nozzle casing.  
     
     
         6 . A method for producing a nozzle for a suction jet pump having a nozzle arranged upstream of a mixing tube and configured for connection to a propellant line and a nozzle duct, wherein the nozzle has a nozzle insert in the region of the nozzle duct, comprising: 
 manufacturing the nozzle insert as a separate component from plastic by the injection-molding method, the nozzle duct being made during injection molding.    
     
     
         7 . A method for producing a nozzle for a suction jet pump having a nozzle arranged upstream of a mixing tube and configured for connection to a propellant line and a nozzle duct, wherein the nozzle has a nozzle insert in the region of the nozzle duct, comprising: 
 working the nozzle duct into plastic, after the manufacture of the nozzle insert from metal or plastic.    
     
     
         8 . The method as claimed in  claim 7 , wherein the nozzle duct is worked into the nozzle insert by means of a drilling tool.  
     
     
         9 . The method as claimed in  claim 7 , wherein the nozzle duct is worked into the nozzle insert by means of a laser beam or by the erosion method.  
     
     
         10 . The method as claimed in  claim 7 , wherein the nozzle insert and the nozzle casing are pressed or snapped together with one another.  
     
     
         11 . The method as claimed in  claim 6 , wherein the nozzle insert and the nozzle casing are pressed or snapped together with one another.