Impeller for a centrifugal pump
The impeller for a centrifugal pump includes a carrier disk and possibly a shroud. The blades of the impeller are identical, but are arranged in pairs such that impellers of different hydraulic characteristics are formed with blades of the same shape.
1. An impeller for a centrifugal pump having a carrier disk ( 1 ) and blades ( 3 ) arranged thereon, the blades ( 3 ) being arranged next to one another in pairs, whereas in each case a blade pair forms a flow-effective blade ( 3 a , 3 b ), wherein at least the blades ( 3 a , 3 b ) forming the blade pair have the same shape and size, and wherein at least a radial end of one of the blades forming the blade pair bears on a surface of the other of the blades forming the blade pair.
2. An impeller according to claim 1 , wherein the blades ( 3 a , 3 b ) of each blade pair bear on one another in a telescopic manner.
3. An impeller according to claim 1 , wherein the blades 3 a , 3 b ) of each blade pair form a dead space ( 6 ).
4. An impeller according to claim 3 , wherein the blades ( 3 a , 3 b ) of each blade pair which form a dead space ( 6 ) are distanced at their radially outer ends ( 8 ) and the radially inner end ( 7 ) of the one blade ( 3 b ) bears on the other blade ( 3 a ).
5. An impeller according to claim 1 , wherein a shroud ( 4 ) covers the impeller.
6. An impeller according to claim 5 , wherein the blades ( 3 a , 3 b ) of each blade pair are positioned in a manner such that one blade ( 3 b ) of the blade pair projects radially beyond the carrier disk ( 1 ) and/or the shroud ( 4 ).
7. An impeller according to claim 1 , wherein all blades ( 3 a , 3 b ) have the same shape and size.
8. An impeller according to claim 1 , wherein the blade ( 3 ) has a constant height over its radial length.
9. An impeller according to claim 1 , wherein the carrier disk ( 1 ) and/or shroud ( 4 ) and the blades ( 3 ) are formed of metal and are connected to one another by way of welding.