Coolant pump

Abstract

An axial-flow coolant pump mechanically driven by a pulley, a gear wheel, a plug-in shaft, or the like, for internal combustion engines uses a semi-axial impeller, a Francis impeller or diagonal impeller with three-dimensionally, spatially curved blades as the rotor, and the stator disposed in the pump housing possesses an inner guide cone that narrows in the flow direction, and an outer conical guide cap disposed to be spaced apart from the cone, and the two, spaced apart symmetrically, are connected by way of three-dimensionally, spatially curved stator vanes, wherein the rotor is spaced apart from the stator by a ring gap, in such a manner that the rotor has a minimal distance, not only, on the face side, from the adjacent outer edge of the guide cone, but also, on the face side, from the adjacent outer edge of the guide cap.

1 - 4 . (canceled) 
     
     
         5 . Coolant pump in the design of a coolant pump mechanically driven by a pulley ( 1 ), a gear wheel, a plug-in shaft, or the like, for internal combustion engines, having a pump housing ( 2 ) with a flow entry opening ( 3 ) and a flow exit opening ( 4 ), a pump shaft ( 6 ) rotatably mounted in/on the pump housing ( 2 ) by means of a pump bearing ( 5 ), connected with a pulley ( 1 ) so as to rotate with it, a pump shaft seal ( 8 ) disposed in the pump housing ( 2 ), between the latter and the pump shaft ( 6 ), on the drive side, next to the flow entry opening ( 3 ), in a seal seat ( 7 ), having a stator ( 9 ) disposed in the pump housing ( 2 ) in fixed manner, to prevent rotation, with guide vanes ( 10 ), in which stator a bearing accommodation ( 11 ) is situated, in which a slide bearing ( 12 ) is disposed, in which bearing the pump shaft ( 6 ) is mounted with its pump shaft end opposite the drive side, for example the pulley ( 1 ), wherein a rotor ( 14 ) with blades ( 15 ) is disposed on the pump shaft ( 6 ), so as to rotate with it, adjacent to the stator ( 9 ) with the slide bearing ( 12 ), in the direction of the flow entry opening ( 3 ), by a ring gap ( 13 ), and wherein the flow entry opening ( 3 ) is disposed to the side of the center axis of the pump shaft ( 6 ), so that the flow entry takes place at a slant to the axis of rotation of the rotor ( 14 ), wherein
 the rotor ( 14 ) is a semi-axial impeller, a Francis impeller or diagonal impeller with three-dimensionally, spatially curved blades ( 15 ), and   wherein the stator ( 9 ) disposed in fixed manner in the pump housing ( 2 ) possesses an inner guide cone ( 16 ) that narrows in the flow direction, and an outer conical guide cap ( 17 ) disposed to be spaced apart from the cone, and   wherein the guide cone ( 16 ) is connected with the guide cap ( 17 ), spaced apart symmetrically, by way of three-dimensionally, spatially curved stator vanes ( 10 ), and   wherein the rotor ( 14 ) is spaced apart from the stator ( 9 ) by a minimal ring gap ( 13 ), wherein the rotor ( 14 ) has a minimal distance, not only, on the face side, from the adjacent outer edge of the guide cone ( 16 ), but also, on the face side, from the adjacent outer edge of the guide cap ( 17 ), by the ring gap ( 13 ),   wherein an inflow chamber ( 19 ) having an inside diameter (D), disposed with rotation symmetry relative to the pump shaft ( 6 ), is situated in the pump housing ( 2 ), directly ahead of the rotor ( 14 ), the chamber length (L) of which chamber amounts to approximately 0.7 to 1.5 times the inside diameter (D).   
     
     
         6 . Coolant pump according to  claim 5 , wherein a guide tongue ( 18 ) is disposed at the free end of the guide cap ( 17 ). 
     
     
         7 . Coolant pump according to  claim 5 , wherein a coolant exit flange ( 20 ) is disposed on the pump housing ( 2 ) in the region of the flow exit opening ( 4 ).