Fuel Pump

Abstract

Disclosed is a fuel pump which is embodied as a side channel pump and is used for conveying fuel into a fuel reservoir of a motor vehicle, and in which a partially annular duct ( 13 ) that extends to a discharge duct ( 8 ) is configured in a continually expanding manner. A partially annular duct ( 12 ) that is connected to an intake duct ( 7 ) tapers in the direction of flow. Blade chambers ( 10 ) that are disposed within an impeller ( 6 ) form a conveying chamber ( 14 ) along with the partially annular ducts ( 12, 13 ). Said conveying chamber ( 14 ) extends from the intake duct ( 7 ) to the discharge duct ( 8 ) and is provided with a constant cross section such that the impeller ( 6 ) is continuously penetrated by a flow.

1 . A fuel pump for delivering fuel into a fuel tank of a motor vehicle, having a driven impeller rotating in a housing, with rings of guide blades defining blade chambers arranged on both end faces of the impeller, opposing blade chambers being connected to one another, with partially annular ducts, which are arranged in the area of the guide blades in an inlet-side housing part and in an outlet-side housing part and which together with the blade chambers form a delivery chamber for delivering a liquid from an inlet duct to an outlet duct, one of the partially annular ducts being connected to the inlet duct and the other, the opposing partially annular duct, being connected to the outlet duct, characterized in that the partially annular duct ( 12 ) in the inlet-side housing part ( 4 ) narrows away from the inlet duct ( 7 ) and/or the partially annular duct ( 13 ) in the outlet-side housing part ( 5 ) widens toward the outlet duct ( 8 ), and that the narrowing or widening extends over at least 80% of the length of the corresponding partially annular duct ( 12 ,  13 ).  
   
   
       2 . The fuel pump as claimed in  claim 1 , characterized in that the narrowing or widening is continuous over the proposed area of the length of the partially annular duct ( 12 ,  13 ).  
   
   
       3 . The fuel pump as claimed in  claim 1  or  2 , characterized in that at least one of the partially annular ducts ( 12 ,  13 ) is of wedge-shaped design in a section along the delivery chamber.  
   
   
       4 . The fuel pump as defined in  claim 1 , characterized in that the delivery chamber ( 14 ) has substantially the same cross-section at any point, the cross-section of the partially annular duct ( 12 ) in the inlet-side housing part ( 4 ) being larger in proximity to the inlet duct ( 7 ) than the cross-section of the partially annular duct ( 13 ) in the outlet-side housing part ( 5 ).