Multi-stage centrifugal pump

Abstract

The invention relates to a multi-stage centrifugal pump with a foot part ( 2 ), a head part ( 14 ) and a wall part ( 16, 16 ′) which connects the foot part ( 2 ) to the head part ( 14 ) and which peripherally surrounds the pump stages at the outer periphery. The centrifugal pump moreover comprises a motor stool connecting to the head part ( 14 ) and for receiving an electric motor ( 20 ) provided for the drive of the centrifugal pump. The wall part ( 16 ) projects in the axial direction beyond the head part ( 14 ) and is connected to the motor stool (FIG. 1 ).

What is claimed is: 
     
         1 . A multi-stage centrifugal pump comprising:
 a foot part;   a head part;   pump stages;   an electric motor to drive the pump stages;   a wall part which connects the foot part to the head part and surrounds the pump stages at an outer periphery;   a motor stool connected to the head part and receiving the electric motor, wherein the wall part projects in an axial direction beyond the head part and is connected to the motor stool.   
     
     
         2 . A centrifugal pump according to  claim 1 , wherein the wall part is formed by a tube, in which the head part is integrated by a weld connection. 
     
     
         3 . A centrifugal pump according to  claim 1 , wherein the motor stool comprises an annular flange arranged at an end of a section of the wall part which extends beyond the head part. 
     
     
         4 . A centrifugal pump according to  claim 3 , wherein the annular flange is configured in a shouldered manner and comprises a section which engages into an inside of the wall part and a section which lies on an end of the wall part. 
     
     
         5 . A centrifugal pump according to  claim 3 , wherein the annular flange is configured for fastening the electric motor. 
     
     
         6 . A centrifugal pump according to  claim 5 , wherein the annular flange is configured for fastening different electric motors. 
     
     
         7 . A centrifugal pump according to  claim 3 , wherein:
 an attachment is formed on the annular flange and projects in the axial direction;   the attachment has an end, which is away from the annular flange, on which a fastening flange for the electric motor is arranged.   
     
     
         8 . A centrifugal pump according to  claim 3 , wherein at least one window is formed on the section of the wall part which extends beyond the head part. 
     
     
         9 . A centrifugal pump according to  claim 3 , wherein two windows are formed on the section of the wall part which extends beyond the head part, said windows being arranged in a manner such that a shaft seal sealing the pump shaft with respect to the head part, as well as at least one bleed valve of the centrifugal pump, which is arranged on the head part, are accessible via the windows. 
     
     
         10 . A centrifugal pump according to  claim 1 , wherein the head part is configured as a deep-drawn part of preferably stainless steel. 
     
     
         11 . A centrifugal pump according to  claim 1 , further comprising a clamping ring, wherein the wall part is clamped on the foot part by the clamping ring. 
     
     
         12 . A centrifugal pump according to  claim 11 , wherein the clamping ring, in a peripheral direction, is configured divided into several ring segments. 
     
     
         13 . A centrifugal pump according to  claim 12 , wherein the clamping ring comprises ring segments that are connected to the foot part amid a creation of a connection to one another.