Pump and method for producing an impeller for a pump

Abstract

In a centrifugal pump for pumping a fluid with central axial suctioning and radial discharging of the fluid to be pumped out of the impeller, the impeller includes an upper cover plate and a lower cover plate and multiple interposed blades therebetween. In the radial inner region, the blades extend essentially parallel to the rotation axis of the impeller in the axial direction of the pump and thus are upright, wherein said blades in the course radially outwards thereof are increasingly inclined or extend oblique.

That which is claimed: 
     
         1 . A pump, in particular for home appliances such as dish washers or washing machines, having an impeller for pumping a fluid, wherein said pump is configured together with said impeller for operation as a centrifugal pump, with a central axial suctioning and a radial discharging of said fluid to be pumped out of said impeller, wherein said impeller comprises an upper cover plate and a lower cover plate and multiple interposed blades therebetween, wherein said blades are less steep inclined relative to a central longitudinal axis of said pump in a radial inner region of said impeller than in a radial outer region of said impeller. 
     
     
         2 . The pump according to  claim 1 , wherein said blades in the course thereof are increasingly inclined or extend increasingly oblique from said radial inner region to said radial outer region. 
     
     
         3 . The pump according to  claim 2 , wherein in said radial inner region said blades extend essentially parallel to a rotation axis of said impeller in said axial direction of said pump, said blades thus being extending upright. 
     
     
         4 . The pump according to  claim 1 , wherein an inclination of said blades is configured such that said blades are inclined or extend oblique relative to said upper cover plate in a rotation direction of said impeller. 
     
     
         5 . The pump according to  claim 1 , wherein a change of an inclination of said blades is monotonously increasing from said radial inner region of said impeller to said radial outer region of said impeller. 
     
     
         6 . The pump according to  claim 5 , wherein said inclination is strictly monotonously increasing. 
     
     
         7 . The pump according to  claim 6 , wherein said inclination is approximately uniformly increasing. 
     
     
         8 . The pump according to  claim 1 , wherein a maximum inclination angle of said blades in said radial outer region is smaller than 75° towards a rotation axis. 
     
     
         9 . The pump according to  claim 8 , wherein said maximum inclination angle of said blades in said radial outer region is between 45° and 70° towards said rotation axis. 
     
     
         10 . The pump according to  claim 1 , wherein said blades are curved in their longitudinal course from radial inwards to outwards opposed to a rotation direction. 
     
     
         11 . The pump according to  claim 10 , wherein said blades are uniformly curved. 
     
     
         12 . The pump according to  claim 1 , wherein said impeller comprises three to eight said blades. 
     
     
         13 . The pump according to  claim 1 , wherein on said lower cover plate of said impeller a projecting protrusion is centrally arranged, said projecting protrusion extending beyond said blades, wherein said blades extend almost up said projecting protrusion. 
     
     
         14 . The pump according to  claim 1 , wherein said blades and said cover plates are produced integrally or in one piece. 
     
     
         15 . The pump according to  claim 14 , wherein said entire impeller is produced integrally and in one piece by means of synthetic material injection molding. 
     
     
         16 . A method for producing an impeller for a pump according to  claim 1 , wherein said impeller is produced by means of synthetic material injection molding, wherein exclusively linear pushers are driven into regions between said blades of said impeller along a plane perpendicular to a rotation axis of said impeller. 
     
     
         17 . The method according to  claim 16 , wherein said linear pushers for said blades are all driven in from radially outwards essentially in one plane. 
     
     
         18 . The method according to  claim 16 , wherein at least one additional linear pusher is driven in along said rotation axis of said impeller or in along said axial direction, respectively. 
     
     
         19 . The method according to  claim 18 , wherein said additional linear pusher is driven in along said rotation axis of said impeller or in said axial direction, respectively, through said upper cover plate in a direction to said lower cover plate, in order to form a central region of said impeller or to form said radial inner region of said blades, respectively.