Fluid pump

Abstract

The invention relates to an electric fluid pump with a semi-axial construction, in which a motor housing part ( 9 ), situated at the pressure end, has a conduction device ( 42 ). The conduction device ( 42 ) allows an almost completely irrotational flow to be achieved so that the kinetic energy of the tangential component of the flow velocity is converted into pressure energy with negligible friction losses. This feature of the invention increases the efficiency of the fluid pump. The dimensions of the electric motor can therefore be reduced while maintaining the same delivery quantity.

1 . A fluid pump for internal combustion engines, comprising.
 an electric motor having a rotor arranged in a motor housing and a stator, wherein the rotor is arranged on a drive shaft at least in a manner secured against rotation;   an impeller fastened on the drive shaft;   at least one set of guide vanes arranged behind the impeller in a flow direction of fluid to be conveyed; and   a pump housing enclosing the motor housing, the impeller and the guide vanes, wherein a pressure port and an intake port are arranged at opposite axial ends of the pump housing; wherein   
     a pressure-side motor housing part of the motor housing includes a conduction device. 
   
   
       2 . The fluid pump for internal combustion engines of  claim 1 , wherein the conduction device is formed by recirculation vanes manufactured integrally with the pressure-side motor housing part and formed on the surface thereof. 
   
   
       3 . The fluid pump for internal combustion engines of  claim 1 , wherein the pressure-side motor housing part is tapered in the flow direction and is enclosed by a correspondingly formed pressure-side pump housing part. 
   
   
       4 . The fluid pump for internal combustion engines of  claim 1 , wherein the pressure-side pump-housing part is formed with grooves into which radial ends of the recirculation vanes extend. 
   
   
       5 . The fluid pump for internal combustion engines of  claim 4 , wherein the pressure-side motor housing part is adapted to slide into a receiving opening of an axially adjoining motor housing part by slipping the pressure-side pump housing part onto the pressure-side motor housing part, with interposition of a gasket, wherein the pressure-side motor housing part is fixed by fastening the pressure-side pump housing part at a pump housing part situated radially outward with respect to the axially adjoining motor housing part. 
   
   
       6 . The fluid pump for internal combustion engines of  claim 1 , wherein the pressure-side pump-housing part has a flange by which the fluid pump fastens to an internal combustion engine. 
   
   
       7 . The fluid pump for internal combustion engines of  claim 1 , wherein a plurality of fluid pumps are connected in series via a flange connection, wherein the flanges are formed at the pressure-side pump housing part of the first pump and a suction-side pump housing part of a downstream pump. 
   
   
       8 . The fluid pump for internal combustion engines of  claim 2 , wherein the pressure-side motor housing part is tapered in the flow direction and is enclosed by a correspondingly formed pressure-side pump housing part. 
   
   
       9 . The fluid pump for internal combustion engines of  claim 2 , wherein the pressure-side pump-housing part is formed with grooves into which radial ends of the recirculation vanes extend. 
   
   
       10 . The fluid pump for internal combustion engines of  claim 3 , wherein the pressure-side pump-housing part is formed with grooves into which radial ends of the recirculation vanes extend. 
   
   
       11 . The fluid pump for internal combustion engines of  claim 9 , wherein the pressure-side motor housing part is adapted to slide into a receiving opening of an axially adjoining motor housing part by slipping the pressure-side pump housing part onto the pressure-side motor housing part, with interposition of a gasket, wherein the pressure-side motor housing part is fixed by fastening the pressure-side pump housing part at a pump housing part situated radially outward with respect to the axially adjoining motor housing part. 
   
   
       12 . The fluid pump for internal combustion engines of  claim 10 , wherein the pressure-side motor housing part is adapted to slide into a receiving opening of an axially adjoining motor housing part by slipping the pressure-side pump housing part onto the pressure-side motor housing part, with interposition of a gasket, wherein the pressure-side motor housing part is fixed by fastening the pressure-side pump housing part at a pump housing part situated radially outward with respect to the axially adjoining motor housing part.