Centrifugal pump

Abstract

A centrifugal pump having a casing axially divided into two casing halves; an intake and a discharge; as well as an at least one-stage flow channel between the intake and the discharge for a medium to be pressurized; and a shaft mounted for rotation within the casing and being driven by motor; at least one impeller attached thereon and arranged in a stage channel of the flow channel; and at least one guide device on a partition wall arranged within the stage channel in the region of the intake of the associated impeller. There is provided, for influencing the pre-rotation within the flow in the intake of the stage channel of the impeller, that the radial angular position of the guide device arranged on the partition wall is adapted to be adjusted with reference to the plane of partition of the casing as zero position; a positioning device is mounted on the partition wall at a selectable angular distance from the guide device; and said positioning device is received by the casing in the region of the plane of partition of the latter.

1 . A centrifugal pump comprising:
 casing means axially divided into two casing halves;   intake means and discharge means;   at least one-stage flow channel defined between said intake means and said discharge means for receiving a medium to be pressurized;   shaft means mounted for rotation within said casing means and being driven by motor,   at least one impeller means attached on said shaft means and arranged in a stage channel means of said flow channel;   partition wall means arranged within said stage channel means in a region of said intake of an associated one of said impeller means;   at least one guide means disposed on said partition wall means;   a radial angular position of said guide means disposed on said partition wall means being adapted for adjustment with reference to a plane of partition of said casing means at a zero position;   positioning means being provided and mounted on said partition wall means at a selectable angular distance from said guide means; and   said positioning means being received by said casing means in a region of a plane of partition defined by said two casing halves.   
   
   
       2 . The centrifugal pump as claimed in  claim 1 , wherein said partition wall means is an annular split wall restricting said stage channel means on one side, from which annular split wall said guide means extends into said stage channel means in an axial direction. 
   
   
       3 . The centrifugal pump as claimed in  claim 1 , wherein said guide means comprises guide vane means adapted to extend in an essentially radial direction towards said shaft means. 
   
   
       4 . The centrifugal pump as claimed in  claim 2 , wherein said guide means comprises guide vane means adapted to extend in an essentially radial direction towards said shaft means. 
   
   
       5 . The centrifugal pump as claimed in  claim 3 , wherein said guide vane means is provided with a tip end and extends into an immediate vicinity of said shaft means so that said tip end of said guide vane means is disposed at a very short distance from said shaft means. 
   
   
       6 . The centrifugal pump as claimed in  claim 4 , wherein said guide vane means is provided with a tip end and extends into an immediate vicinity of said shaft means so that said tip end of said guide vane means is disposed at a very short distance from said shaft means. 
   
   
       7 . The centrifugal pump as claimed in  claim 3 , wherein said guide means includes an arched portion adapted to merge into said guide vane means protruding from said arched portion in a radial direction. 
   
   
       8 . The centrifugal pump as claimed in  claim 4 , wherein said guide means includes an arched portion adapted to merge into said guide vane means protruding from said arched portion in a radial direction. 
   
   
       9 . The centrifugal pump as claimed in  claim 5 , wherein said guide means includes an arched portion adapted to merge into said guide vane means protruding from said arched portion in a radial direction. 
   
   
       10 . The centrifugal pump as claimed in  claim 6 , wherein said guide means includes an arched portion adapted to merge into said guide vane means protruding from said arched portion in a radial direction. 
   
   
       11 . The centrifugal pump as claimed in  claim 7 , wherein said guide vane means defines lateral faces extending in concave curving at both sides of said guide vane means on said arched portion. 
   
   
       12 . The centrifugal pump as claimed in  claim 8 , wherein said guide vane means defines lateral faces extending in concave curving at both sides of said guide vane means on said arched portion. 
   
   
       13 . The centrifugal pump as claimed in  claim 9 , wherein said guide vane means defines lateral faces extending in concave curving at both sides of said guide vane means on said arched portion. 
   
   
       14 . The centrifugal pump as claimed in  claim 10 , wherein said guide vane means defines lateral faces extending in concave curving at both sides of said guide vane means on said arched portion. 
   
   
       15 . The centrifugal pump as claimed in  claim 11 , wherein said guide vane means is disposed on said arched portion in a position which is displaced in relation to a length of said arched portion and when viewed in a circumferential direction thereof, and wherein one of said concavely curved lateral faces of said guide vane means extends in a longitudinally stretched manner, whereas an other one of said concavely curved lateral faces extends as a relatively short curving. 
   
   
       16 . The centrifugal pump as claimed in  claim 12 , wherein said guide vane means is disposed on said arched portion in a position which is displaced in relation to the length of said arched portion and when viewed in a circumferential direction thereof, and wherein one of said concavely curved lateral faces of said guide vane means extends in a longitudinally stretched manner, whereas an other one of said concavely curved lateral faces extends as a relatively short curving. 
   
   
       17 . The centrifugal pump as claimed in  claim 7 , wherein the guide vane means is designed with portions which protrude beyond a plane of a free lateral surface defined by said arched portion. 
   
   
       18 . The centrifugal pump as claimed in  claim 8 , wherein the guide vane means is designed with portions which protrude beyond a plane of a free lateral surface defined by said arched portion. 
   
   
       19 . The centrifugal pump as claimed in  claim 1 , wherein said guide means is designed as separate structural component means and comprises attachment portion means adapted to mount said guide means on said partition wall means. 
   
   
       20 . The centrifugal pump as claimed in  claim 19 , wherein said attachment portion means of said guide means is adapted for insertion in cut-out means provided on a circumferential face of said partition wall means and is designed in annular shape, for being secured thereto. 
   
   
       21 . The centrifugal pump as claimed in  claim 20 , wherein said cut-out means on said partition wall means, and said attachment portion means are adapted to each other regarding their shape such that a profile of said circumferential face of said partition wall means continues essentially without interruption on a surface and on a lateral face defined on said attachment portion means. 
   
   
       22 . The centrifugal pump as claimed in  claim 1 , wherein said positioning means comprises a peg protruding outwardly from said circumferential face of said partition wall means in a radial direction and engaging receptacle means defined in a region of separation faces of said two casing halves. 
   
   
       23 . The centrifugal pump as claimed in  claim 1 , wherein said positioning means comprises a peg protruding outwardly from annular web means in a radial direction and engaging receptacle means defined in a region of separation faces of said two casing halves.