Centrifugal pump

Abstract

The invention relates to a centrifugal pump, in particular, a single stage or multi-stage side channel pump in a modular design, wherein the stage or every stage of the pump comprises a preferably divided modular housing with assigned centrifugal impellers, which are designed so as to be self-supporting; and, thus, a pump shaft, which is known in the prior art, is no longer necessary.

1 . Centrifugal pump ( 10 ), in particular, a single stage or multi-stage side channel pump in a modular design, wherein the stage or every stage of the pump comprises a modular housing ( 9 ) with an assigned, rotatably mounted centrifugal impeller ( 2 ),
 characterized in that each centrifugal impeller ( 2 ) exhibits an elongated hub ( 3 ), which is provided on the one side with an inner recess ( 5 ) and on the other side with a stub ( 4 ), which can be inserted, so as not to be rotatable, into the inner recess ( 5 ) of the following centrifugal impeller ( 2 ).   
   
   
       2 . Centrifugal pump, as claimed in  claim 1 , characterized in that the hub ( 3 ) on the side of the inner recess ( 5 ) aligns with one of the front faces ( 6 ) of the centrifugal impeller ( 2 ) and on the other side projects with the stub ( 4 ) beyond the opposite front face ( 6 ) of the centrifugal impeller ( 2 ). 
   
   
       3 . Centrifugal pump, as claimed in  claim 1 , characterized in that the inner recess ( 5 ) and the stub ( 4 ) are designed as a non-rotatable plug connection. 
   
   
       4 . Centrifugal pump, as claimed in  claim 1 , characterized in that the centrifugal impeller ( 2 ) is designed with the hub ( 3 ) and the stub ( 4 ) as one piece. 
   
   
       5 . Centrifugal pump, as claimed in  claim 4 , characterized in that the centrifugal impeller ( 2 ) with the hub ( 3 ) and its inner recess ( 5 ) as well as with the stub ( 4 ) are made of a casting, which no longer has to be machined. 
   
   
       6 . Centrifugal pump, as claimed in  claim 5 , characterized in that the centrifugal impeller ( 2 ) with the hub ( 3 ) and the stub ( 4 ) are made of a malleable cast iron or a similar material. 
   
   
       7 . Centrifugal pump, as claimed in  claim 3 , characterized in that the inner recess ( 5 ) is configured as an inner polygon; and the stub ( 4 ) is configured as an outer polygon that is adapted to the inner polygon. 
   
   
       8 . Centrifugal pump, as claimed in  claim 1 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       9 . Centrifugal pump, as claimed in  claim 1 , characterized in that the last centrifugal impeller ( 2   b ), as seen from the drive side, is braced in the pump housing ( 18 ) with a shaft journal ( 17 ). 
   
   
       10 . Centrifugal pump, as claimed in  claim 2 , characterized in that the inner recess ( 5 ) and the stub ( 4 ) are designed as a non-rotatable plug connection. 
   
   
       11 . Centrifugal pump, as claimed in  claim 2 , characterized in that the centrifugal impeller ( 2 ) is designed with the hub ( 3 ) and the stub ( 4 ) as one piece. 
   
   
       12 . Centrifugal pump, as claimed in  claim 3 , characterized in that the centrifugal impeller ( 2 ) is designed with the hub ( 3 ) and the stub ( 4 ) as one piece. 
   
   
       13 . Centrifugal pump, as claimed in  claim 10 , characterized in that the centrifugal impeller ( 2 ) is designed with the hub ( 3 ) and the stub ( 4 ) as one piece. 
   
   
       14 . Centrifugal pump, as claimed in  claim 2 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       15 . Centrifugal pump, as claimed in  claim 3 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       16 . Centrifugal pump, as claimed in  claim 4 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       17 . Centrifugal pump, as claimed in  claim 10 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       18 . Centrifugal pump, as claimed in  claim 11 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       19 . Centrifugal pump, as claimed in  claim 12 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ). 
   
   
       20 . Centrifugal pump, as claimed in  claim 13 , characterized in that a drive shaft ( 15 ) is mounted rotatably on the one side in a pump housing ( 18 ) and on the other side in a bearing housing ( 19 ) with a shaft bearing ( 16 ), wherein the drive sided shaft end ( 20 ) is free for the connection of a drive motor; and the opposite pump-sided shaft end ( 21 ) is provided with a stub ( 4   a ), which can be inserted, so as not to be rotatable, into the inner recess ( 5   a ) of the first centrifugal impeller ( 2   a ).