Multiple-stage centrifugal pump of inline design

Abstract

The present invention relates to a multiple-stage centrifugal pump of inline design, comprising a connection housing ( 1 ) with connectors ( 2, 3 ) in the form of suction and pressure connectors, and a pump body ( 4 ). The pump body ( 4 ) is surrounded at a spacing by a casing tube ( 6 ) with the formation of a flow-guiding annular space ( 5 ). The pump body ( 4 ) and the casing tube ( 6 ) are fastened so as to transmit force between the connection housing ( 1 ) and a head piece ( 7 ), the head piece ( 7 ) is provided with a leadthrough for a motor-driven pump shaft ( 8 ), and the connection piece ( 1 ) is provided with a separating wall ( 9 ) which divides the suction and pressure regions, a flow-diverting guide element ( 10 ) being arranged in the transition region between the annular space ( 5 ) and a connector ( 3 ).

1 . Multiple-stage centrifugal pump of inline design, comprising a connection housing ( 1 ) with connectors ( 2 ,  3 ) in the form of suction and pressure connectors, a pump body ( 4 ), the pump body ( 4 ) being surrounded at a spacing by a casing tube ( 6 ) with the formation of a flow-guiding annular space ( 5 ), the pump body ( 4 ) and the casing tube ( 6 ) being fastened to transmit force between the connection housing ( 1 ) and a head piece ( 7 ), the head piece ( 7 ) being provided with a leadthrough for a motor-driven pump shaft ( 8 ), and the connection piece ( 1 ) being provided with a separating wall ( 9 ) which divides the suction and pressure regions, wherein a flow-diverting guide element ( 10 ) is arranged in the transition region between the annular space ( 5 ) and a connector ( 3 ). 
   
   
       2 . Centrifugal pump according to  claim 1 , wherein the guide element ( 10 ) is arranged between the annular space ( 5 ) and the pressure connector. 
   
   
       3 . Centrifugal pump according to  claim 1 , wherein the guide element ( 10 ) is configured as a constituent part of the separating wall ( 9 ). 
   
   
       4 . Centrifugal pump according to  claim 1 , wherein the guide element ( 10 ) is connected by one or more rib-like elements to the separating wall ( 9 ) and/or to a wall face ( 11 ) of the connection piece ( 1 ). 
   
   
       5 . Centrifugal pump according to  claim 1 , wherein the guide element ( 10 ) is arranged as an insert part between the connection piece ( 1 ), pump body ( 4 ) and/or casing tube ( 6 ) and/or is connected to it. 
   
   
       6 . Centrifugal pump according to  claim 1 , wherein the guide element ( 10 ) is spatially curved and has a trapezoidal or triangular contour in a projection onto the throughflow plane. 
   
   
       7 . Centrifugal pump according to  claim 1 , wherein the guide element ( 10 ) is of tab-shaped design. 
   
   
       8 . Centrifugal pump  claim 7 , wherein the guide element ( 10 ) protrudes with its free end as far as up to or into the connector cross section. 
   
   
       9 . Centrifugal pump according to  claim 7 , wherein the guide element ( 10 ) is fastened by one end in the transition between the separating wall ( 9 ) and the inner wall face of the annular space. 
   
   
       10 . Centrifugal pump according to  claim 1 , wherein the tab-shaped guide element ( 10 ) has a width in the region of an inner wall face of the annular space, which width is equal to or less than (=<) 0.75 times (x) the nominal width of the connector ( 3 ). 
   
   
       11 . Centrifugal pump according to  claim 1 , wherein the connection width of the guide element ( 10 ) is equal to or less than (=<) 0.5 times (x) the nominal width of the connector ( 3 ). 
   
   
       12 . Centrifugal pump according to  claim 1 , wherein a flow channel which diverts by at least 75 degrees is formed between a flow-diverting surface of the guide element ( 10 ) and the opposite wall face of the annular space ( 5 ) and/or connector ( 3 ). 
   
   
       13 . Centrifugal pump  claim 12 , wherein a part stream of the annular-space stream flows out of the flow channel approximately tangentially into the connector cross section or a pipe which is connected to it. 
   
   
       14 . Centrifugal pump according to  claim 1 , wherein the flow-diverting surface of the guide element ( 10 ) is formed in two planes which lie perpendicularly with respect to one another and which are concave/planar or concave/convex and/or concave/concave. 
   
   
       15 . Multiple-stage centrifugal pump of inline design, comprising a connection housing ( 1 ) with connectors ( 2 ,  3 ) in the form of suction and pressure connectors, a pump body ( 4 ), the pump body ( 4 ) being surrounded at a spacing by a casing tube ( 6 ) with the formation of a flow-guiding annular space ( 5 ), the pump body ( 4 ) and the casing tube ( 6 ) being fastened to transmit force between the connection housing ( 1 ) and a head piece ( 7 ), the head piece ( 7 ) being provided with a leadthrough for a motor-driven pump shaft ( 8 ), and the connection piece ( 1 ) being provided with a separating wall ( 9 ) which divides the suction and pressure regions, wherein a flow-guiding annular element ( 12 ) having a flow-guiding surface of convex design bridges the space between an outflow opening ( 13 ) of the pump body ( 4 ) and an internal diameter (D i ) at the inlet cross section ( 14 ) of the annular gap. 
   
   
       16 . Centrifugal pump according to  claim 15 , wherein an annular nozzle is formed between the flow-guiding head-piece face ( 15 ) and the annular element ( 12 ). 
   
   
       17 . Centrifugal pump according to  claim 15 , wherein the annular element ( 12 ) is connected by one or more guide elements ( 16 ) to the head piece ( 7 ). 
   
   
       18 . Centrifugal pump according to  claim 1 , wherein the head piece ( 7 ) is configured in one piece or multiple pieces. 
   
   
       19 . Centrifugal pump according to  claim 2 , wherein the guide element ( 10 ) is arranged between the annular space ( 5 ) and the pressure connector. 
   
   
       20 . Centrifugal pump according to  claim 16 , wherein the annular element ( 12 ) is connected by one or more guide elements ( 16 ) to the head piece ( 7 ).