Pump impeller and radial pump comprising the impeller

Abstract

The invention relates to a pump impeller for a radial pump with a carrier plate comprising an intake side and a rear side situated opposite the intake side, a blading being provided on the intake side for conveying a medium to be pumped, characterized in that, on the rear side of the carrier plate, at least one flow profile is situated which is configured and formed to reduce at least a difference between a pressure-induced balance of forces on the carrier plate and on a cover plate in the case of a rotation of the pump impeller in a rotational direction (DR).

What is claimed is: 
     
         1 . A pump impeller for a radial pump with a carrier plate comprising:
 an intake side and a rear side situated opposite the intake side, a blading being provided on the intake side for conveying a medium to be pumped,   wherein, on the rear side of the carrier plate, at least one flow profile is situated which is configured and formed to reduce at least a difference between a pressure-induced balance of forces on the carrier plate and on a cover plate in the case of a rotation of the pump impeller in a rotational direction (DR).   
     
     
         2 . The pump impeller according to  claim 1 , wherein the at least one flow profile, as seen in a circumferential direction (UR), is a ramp contour, in particular a short ramp contour, i.e., a ramp ridge, or a long ramp contour, i.e., a circular surface segment ramp. 
     
     
         3 . The pump impeller according to  claim 1 , wherein n ramp contours are distributed over a circumference (U) of the pump impeller, n being ≥2. 
     
     
         4 . The pump impeller according to  claim 1 , wherein in an, as seen in a radial direction (R), internal area of the rear side of the carrier plate, the number (n) of the ramp contours is lower than in an area further outside, which has a higher number (n) of ramp contours, in particular an integer multiple of the number (n), in particular in that six ramp contours are provided in the inner area and twelve ramp contours are provided in the outer area (closer to the annular edge). 
     
     
         5 . The pump impeller according to  claim 1 , wherein the at least one ramp contour is formed raised from a base surface of the rear side counter to the rotational direction (DR). 
     
     
         6 . The pump impeller according to  claim 1 , wherein the at least one ramp contour is flush with respect to the base surface of the rear side counter to the rotational direction (DR) and intervals between two ramp contours are formed recessed with respect to the base surface. 
     
     
         7 . The pump impeller according to  claim 1 , wherein the at least one ramp contour is formed raised with respect to the base surface of the rear side, and at least part of the intervals between two ramp contours is formed recessed with respect to the base surface. 
     
     
         8 . The pump impeller according to  claim 1 , wherein the ramp contour has a cut-off edge which extends in particular radially. 
     
     
         9 . The pump impeller according to  claim 1 , wherein a maximum height (h) of the ramp contour is smaller than a wall thickness (t) of the carrier plate. 
     
     
         10 . The pump impeller according to  claim 1 , wherein a radial extension of the cut-off edge extends from a hub area of the pump impeller to a radially outward circumferential annular edge of the base surface. 
     
     
         11 . The pump impeller according to  claim 1 , wherein in that a ramp rear surface of the at least one ramp contour is a plane. 
     
     
         12 . The pump impeller according to  claim 9 , wherein the ramp rear surface, as seen in the circumferential direction (UR), is formed curved, and the curvature is formed constant along the circumferential direction (UR) or increasing towards the cut-off edge. 
     
     
         13 . The pump impeller according to  claim 1 , wherein the cut-off edge descends perpendicular to the base surface. 
     
     
         14 . The pump impeller according to  claim 1 , wherein the cut-off edge descends perpendicular to the ramp rear surface or, in the case of a curved formation of the ramp rear surface, descends perpendicular to a tangent plane to the ramp rear surface in the area of the cut-off edge. 
     
     
         15 . A radial pump comprising a pump impeller according to  claim 1 .