DK1564410T3

DK1564410T3 - Vertical centrifugal pump assembly

Info

Publication number: DK1564410T3
Application number: DK05001887.8T
Authority: DK
Inventors: Thomas Heng; Michael Lukas
Original assignee: Klein Schanzlin & Becker Ag
Priority date: 2004-02-13
Filing date: 2005-01-29
Publication date: 2017-02-06
Also published as: ES2609916T3; PT1564410T; HUE032905T2; PL1564410T3; DE102004029557B4; DE102004029557A1

Description

Vertical centrifugal pump module

The subject matter of the invention is a vertical centrifugal pump assembly, in particular for wet installation into a closed container, having an intermediate pipe which encloses the shaft of the assembly and is arranged between a cage which supports the electric motor of the assembly and the housing of the centrifugal pump, the assembly being fastened to a horizontally running flat part which is arranged below the flange of the cage, in particular to the cover of a container.

Such an assembly is disclosed by US 6 315 530 Bl. The intermediate pipe of this assembly is equipped with flanges with the aid of which it is connected on one hand to a corresponding flange of the cage and on the other hand to the pressure cover of the centrifugal pump housing via bolts. The flanges of such an intermediate pipe can, in so far as this involves a cast part, be connected integrally to the pipe body. The flanges can otherwise be connected to a pipe by welding, which nevertheless increases the production outlay. No matter how they have been produced, the disadvantage equally applies to the installation-ready intermediate pipes that they are adapted in each case only to a specific shaft length. If therefore such a centrifugal pump assembly is configured in various structural lengths, a separate mould is required for each one in the case of intermediate pipes produced by casting. Adjustments to structural lengths not hitherto intended are made very difficult, if not even ruled out due to the high outlay. DE 1 528 888 A1 discloses a clip pump for aggressive media in the case of which a solidly configured block of corrosion-resistant plastic with passage for the shaft to be passed through is arranged between the motor or the bearing flange and the pump housing as a connection. The plastic block also serves as a pressure line for the centrifugal pump. The block is dimensioned such that, despite low mechanical strength, it is able to absorb stresses which occur during operation.

The object on which the invention is based is to create a centrifugal pump assembly of the above-mentioned tyre in the case of which the manufacture, adjustment and attachment of the intermediate pipe require a low degree of outlay.

The set object is achieved according to the invention in that the intermediate pipe is configured as a pure pipe without flanges or other widened portions on its end faces, and the end faces are pressed against the cage and the pump housing by way of screw connections which are distributed uniformly over the circumference, the cage and the flat part which is arranged below it being connected to one another via screw connections.

The cage can be equipped with two hole circles which are arranged on different diameters. This makes it possible to use a single configuration of the cage in different configurations of centrifugal pump assemblies. In the case of assemblies of larger diameter, the screw connections between the cage, the flat part and the pump housing take place via the hole circle of larger diameter, the screw connections at the same time receiving the flat part which is arranged below the cage. In the case of assemblies of smaller diameter, the connection between the cage and the pump housing takes place via the hole circle of smaller diameter, while the cage is connected via the hole circle of larger diameter via bolts to the flat part.

An attachment with the aid of a flange is proposed as an expedient alternative to a fastening of the assembly which takes place directly on a container cover or the like. For this purpose, the flat part which is arranged below the cage is formed as a loose-type flange. In this manner, the assembly can be fastened to differently configured surfaces.

As a result of the invention, rapid and easy adjustment of the intermediate pipe length to the respective circumstances becomes possible without different configurations of intermediate pipes having to be produced and retained on a bearing. The intermediate pipe configured without flanges or other widened portions can be connected to the cage and the pump housing with the aid of a screw connection which is fundamentally known. One preferred configuration lies in the intermediate pipe being clamped in by means of tie rods between the cage and the pump housing, wherein, in the case of use of the smaller hole circle, the tie rods at the same time receive the flat part which is arranged below the cage with the aid of nuts. A likewise advantageous alternative lies in the intermediate pipe being provided with grooves which run over the entire circumference and into which in each case one loose-type flange which is provided with joints engages with the aid of one or more projections which are arranged on its inner circumference, the said loose-type flange being connected to the flat part which is arranged below the cage flange via a screw connection, in particular the cover of a container or a further loose-type flange. The type of flange used here is fundamentally previously known from DE 20 53 147.

In the case of a further alternative, the intermediate pipe is provided with recesses, into which securing elements engage in a positively locking manner, the securing elements supporting in each case one loose-type flange which is provided with holes for receiving screw connections. The recesses can be composed of individual holes into which pins or similar elements are pushed; the loose-type flange comes into contact with these.

Instead of individual holes, the intermediate pipe can, however, also be provided with grooves which run over the entire circumference and receive in each case one supporting ring, with which the loose-type flange comes into contact. A flange configuration of this type is fundamentally previously known from US 3 861 722.

Instead of a loose-type flange, individual sockets which are distributed uniformly over the circumference can also be provided which are received by pins which are in turn arranged in holes which were incorporated into the intermediate pipe. The entirety of the sockets therefore serves to receive the screw connection. While the holes present in the sockets possess smooth walls and the screw elements are formed by additional nuts, in the case of a further alternative, instead of the smooth sockets, nuts are provided which directly receive correspondingly configured bolts or threaded bolts.

One preferred configuration of the invention provides that the end faces of the intermediate pipe bear directly against the flange of the cage and against the pump housing, in particular against its pressure-side cover. This means that flanges assigned separately to the intermediate pipe are superfluous. This applies in particular in the cases in which the diameter of the intermediate pipe corresponds to the counter-surfaces of the cage flange or of the pump housing which serve to bear the end faces of said intermediate pipe. A further advantageous configuration of the invention lies in one or both end faces of the intermediate pipe bearing respectively against an interconnected loose-type flange. This makes it possible among other things, in the case of a larger diameter of the bearing surface on the cage, to also use a pipe of smaller diameter since such a bearing surface which is dependent on the size of the cage is made available for the intermediate pipe. A significant economic advantage is naturally produced from the circumstance that such a pipe with a smaller diameter can be used instead of a pipe with a large diameter.

The advantageous concept which emerges from the nature of the invention, according to which the intermediate pipe is formed by commercially available pipe material which is optionally adapted to the respective conditions by way of corresponding shortening, can also be further beneficially used. A further possibility of adapting the assembly to different circumstances emerges if spacer elements are arranged between the flat part, for example, the flange, and the cage which is located below the electric motor. Such spacer elements, such as sleeves, plates, rings or nuts, allow rapid adjustment, which can optionally be carried out in situ, of the assembly to different immersion depths. The centrifugal pump assembly according to the invention thus replaces all the configurations whose shaft and intermediate housing lengths lie within the adjustment range of the stated advantageous configuration.

It also lies in the context of the invention to integrate intermediate bearings for the shaft into the configuration of the centrifugal pump assembly. Above all, two advantageous alternatives are offered for such a bearing arranged in the intermediate pipe:

In the case of a first configuration, an intermediate bearing is used which is held in its position by means of a plurality of bolts which penetrate the intermediate pipe. In a preferred configuration, this can be achieved by three bolts which are distributed uniformly over the circumference, can be locked by means of nuts and lock nuts, and can be adjusted in each case with the aid of a thread which is arranged in the intermediate pipe.

An intermediate pipe which is divided into two identical halves is used in a second configuration. A carrier for an intermediate bearing is clamped in between the two halves, the contour of which carrier is adapted to the end faces of the intermediate pipe halves.

In one preferred configuration of the invention, the intermediate bearing is supplied with lubricating fluid via a line. This line can, in an expedient configuration, be connected to the pressure-side inner region of the centrifugal pump assembly.

The invention is explained in greater detail on the basis of an exemplary embodiment. In the drawing

Fig. 1 shows a centrifugal pump assembly which corresponds to the prior art with a self-supporting assembly shaft mounted solely in a cage;

Fig. 2 shows a centrifugal pump assembly according to the invention, the shaft of which is also formed to be self-supporting;

Fig. 3 shows a pump assembly which shows a variant of the invention, wherein the shaft thereof is still mounted in the housing of the pump;

Figs. 4 to 6 show details of alternative forms of fastening of the assembly;

Figs. 7 and 8 show two views of an intermediate bearing for the shaft of a centrifugal pump assembly according to the invention;

Fig. 9 shows a centrifugal pump assembly which corresponds to the invention with a further possible configuration of the intermediate bearing.

The centrifugal pump assembly which is represented in Fig. 1 and corresponds to the prior art has an electric motor 1 which is connected via a clutch 2 to assembly shaft 3. Assembly shaft 3 is rotatably mounted in a cage 5 by two bearings 4. At its lower end, cage 5 possesses a flange 6 which is detachably connected to a flange 7 of an intermediate pipe 8 via a plurality of bolts. Flange 7 of intermediate pipe 8 is in turn connected to cover 9 of a container, not represented, via bolts.

Intermediate pipe 8 thus projects into the container; it encloses assembly shaft 3. At its lower end, intermediate pipe 8 possesses a flange 10 which is detachably connected to housing 11 of a centrifugal pump 12 - likewise via a plurality of bolts. Centrifugal pump 12 possesses an impeller 13 which takes in fluid located in the container via an inlet 14 and conveys it via an outlet 15 and a pipeline 16 into a pipeline, not represented, located outside the container.

Intermediate pipe 8 is produced in one piece with its flanges 7 and 10 in a casting process. This means that a separate casting pattern has to be retained for each size of the intermediate pipes to be used, and that intermediate pipes which differ from a specific order of size can only be made available with significantly higher outlay.

The configurations represented in Figs. 2 and 3 overcome the highlighted problem in that they make available a theoretically unlimited number of possible sizes of intermediate pipes. This is made possible in that the intermediate pipes are now only configured as pure pipes, i.e. flanges are dispensed with. Several advantageous possibilities arise from this: existing pipe material is easily cut to a desired dimension; production and storage are thus simplified. Above all, commercially available pipe formats can thus be used which signifies a significant commercial advantage due to the omission of separate manufacture of the intermediate pipes.

In principle, the configurations of Figs. 2 and 3 largely have the same elements as the known configuration of Fig. 1. This is expressed by identical parts being provided with the same reference numbers in the exemplary embodiments. There are, however, various peculiarities which result from the design according to the invention of the two configurations:

In the case of the centrifugal pump assembly of Fig. 2, an intermediate pipe 17 which is braced by means of tie rods 18 between flange 6 of cage 5 and pump housing 11 is used. Moreover, a loose-type flange 19 is received by tie rods 18, which loose-type flange 19 serves to fasten the assembly on a container, not represented. Loose-type flange 19, which bears directly against flange 6, is braced by nuts 20 which come to bear below it and above flange 6.

Instead of fastening the assembly with the aid of a loose-type flange, the assembly can, however, also be fastened directly on a container cover. The type of fastening itself would fundamentally be the same as represented in Fig. 2.

The configuration of Fig. 3 possesses a comparatively short cage 21, in which no bearings are provided for assembly shaft 3. Instead, a plain bearing 22 is arranged on cover 23 of pump housing 11 for mounting of shaft 3. This case involves a known type of mounting. One peculiarity lies, however, in the arrangement of flange 19:

Flange 19 is pushed in the direction of pump housing 11 through sleeves 24 which are pushed onto tie rods 18. The depth with which the assembly is immersed into a container or the like is reduced as a result. This means that rapid and uncomplicated adjustment to different immersion depths can be performed at any time with the aid of such sleeves 24. The centrifugal pump assembly can thus be used in a variety of ways.

Instead of sleeves 24, spacer elements of a different type, such as discs or plates, can also be used. Rings or pipes which cover the entire flange circumference can also be used. It is finally also possible to produce the desired spacing by way of further nuts which are arranged above loose-type flange 19 and below cage 6.

Elements of two alternative fastenings to tie rods are represented in Figs. 4 and 5.

Fig. 4 shows nuts 25 which are welded with pins 26. Pins 26 are anchored in holes of intermediate pipe 17. The screw connection required is produced by bolts or threaded bolts, not represented.

Fig. 5 shows a configuration in which a - second - loose-type flange 27 is used. Loose-type flange 27 is supported on a plurality of pins 28 which are arranged distributed uniformly over the circumference of intermediate pipe 17. Instead of pins 28 incorporated in individual holes, a retaining ring which is arranged in a groove, running all the way round, of intermediate pipe 17 can be used with similar effect. A divided loose-type flange, arranged in a groove of the intermediate pipe and fixed by the screw connection still to be attached, can also be used at this point.

Fig. 6 shows an alternative connection between a cage 21 and a flat part 29. Cage 21 is equipped with two hole circles of a different diameter. This allows its use in assemblies of different sizes. In the represented configuration, a connection in the case of a smaller assembly is shown. Here, the flange of cage 21 is connected on one hand via bolts 30 to flat part 29 and on the other hand via tie rods 18 to pump housing 11. In the case of a larger assembly, a direct connection would take place between cage 21 and flat part 29 by means of tic rods 18 via the outer hole circle. This type of connection would correspond to the type represented in Fig. 2.

An intermediate bearing 31 which is arranged in intermediate pipe 17 is represented in Figs. 7 and 8. Intermediate bearing 31 is composed substantially of a bearing carrier 32 and a bearing seat 22 fastened thereto. Shaft 3 itself supports a bearing socket 34 which interacts with bearing seat 33. Bearing carrier 32 is fastened in intermediate pipe 17 by means of stud bolts 35. Installation and alignment of intermediate bearing 31 are carried out in such a manner that intermediate bearing 31 is initially premounted with loose screwing in intermediate pipe 17 and is only fixed after pushing through shaft 3 by uniform tightening of stud bolts 35.

Fig. 9 shows an embodiment in which two identically formed pipes 36 are joined together to form a joint intermediate pipe. A bearing carrier 37 is clamped between the two pipes 36 and is braced together with pipes 36 by tie rods 18. Intermediate bearing 38 held by bearing carrier 37 also encloses here a socket 34 arranged on shaft 3.

Bearings 31 and 38 of Figs. 7 to 9 possess in each case bearing lubrication which is supplied with lubricating fluid via a line 39 connected to the pressure side of the pump assembly. Line 39 discharges in each case into a bore 40 in bearing carrier 32 or 37.

Claims

1. Vertikalt centrifugalpumpeaggregat, navnlig til våd installation i en lukket beholder, med et mellemrør (17), som er anbragt mellem en lanterne (5; 21), der bærer elektromotoren (1) af aggregatet, og huset (11) af centrifugalpumpen (12), og som omslutter akslen (3) af aggregatet, hvor fastgørelsen af aggregatet på en horisontalt forløbende, nedenunder flangen (6) af lanternen (5; 21) anbragt flad del (19; 29) navnlig følger på låget af en beholder, kendetegnet ved, at mellemrøret (17) er udformet som et rent rør uden flanger eller andre udvidelser på sine frontflader, og at frontfladerne trykkes mod lanternen (5; 21) og pumpehuset (11) ved hjælp af ensartet over omkredsen fordelte skrueforbindelser (18, 20; 25; 27), hvor lanternen (5; 21) og den derunder anbragte flade del (19; 29) er forbundet med hinanden over skrueforbindelser (18, 20; 25; 27; 30).A vertical centrifugal pump assembly, in particular for wet installation in a closed container, with an intermediate tube (17) arranged between a lantern (5; 21) carrying the electric motor (1) of the assembly and the housing (11) of the centrifugal pump ( 12), and enclosing the shaft (3) of the assembly, wherein the attachment of the assembly to a horizontally extending, beneath the flange (6) of the lantern (5; 21), flat portion (19; 29), in particular, follows the lid of a container; characterized in that the intermediate tube (17) is formed as a clean tube without flanges or other extensions on its front faces, and that the front faces are pressed against the lantern (5; 21) and the pump housing (11) by means of uniformly distributed screw connections (18, 20; 25; 27), wherein the lantern (5; 21) and the flat portion (19; 29) disposed therein are connected to each other over screw connections (18, 20; 25; 27; 30).

2. Centrifugalpumpeaggregat ifølge krav 1, kendetegnet ved, at lanternen (5; 21) er udrustet med to på forskellige diametre anbragte hulkredse.Centrifugal pump assembly according to claim 1, characterized in that the lantern (5; 21) is equipped with two hole circuits arranged on different diameters.

3. Centrifugalpumpeaggregat ifølge krav 2, kendetegnet ved, at skrueforbindelserne (30) mellem den flade del (29) og lanternen (5; 21) følger over hulkredsen af den mindre diameter, hvor der desuden er tilvejebragt skruer (30) til den på hulkredsen af den større diameter følgende forbindelse af den flade del (19; 29) med lanternen (5; 21).Centrifugal pump assembly according to claim 2, characterized in that the screw connections (30) between the flat part (29) and the lantern (5; 21) follow over the smaller diameter hollow circle, whereby screws (30) are provided for that on the hollow circuit. of the larger diameter following connection of the flat part (19; 29) with the lantern (5; 21).

4. Centrifugalpumpeaggregat ifølge krav 2, kendetegnet ved, at skrueforbindelserne (18, 20; 25; 27) mellem den flade del (29) og lanternen (5; 21) følger over hulkredsen af større diameter, hvor skrueforbindelserne (18, 20; 25; 27) samtidig optager den under lanternen (5; 21) anbragte flade del (19).Centrifugal pump assembly according to claim 2, characterized in that the screw connections (18, 20; 25; 27) between the flat part (29) and the lantern (5; 21) follow over the larger diameter hollow circle, wherein the screw connections (18, 20; 25 ; 27) at the same time occupies the flat portion (19) located below the lantern (5; 21).

5. Centrifugalpumpeaggregat ifølge ét af kravene 1 til 4, kendetegnet ved, at den under lanternen (5; 21) anbragte flade del (19; 29) er en løs flange.Centrifugal pump assembly according to one of claims 1 to 4, characterized in that the flat part (19; 29) disposed beneath the lantern (5; 21) is a loose flange.

6. Centrifugalpumpeaggregat ifølge ét af kravene 1 til 5, kendetegnet ved, at mellemrøret (17) er spændt ind ved hjælp af trækankre (18), hvor trækankrene (18) er fastgjort ved hjælp af en skrueforbindelse på den ene side til lanternen (5; 21) og på den anden side til pumpehuset (11).Centrifugal pump assembly according to one of claims 1 to 5, characterized in that the intermediate pipe (17) is clamped by means of wooden anchors (18), the wooden anchors (18) being secured by means of a screw connection on one side to the lantern (5). ; 21) and, on the other hand, to the pump housing (11).

7. Centrifugalpumpeaggregat ifølge krav 6, kendetegnet ved, at trækankrene (18) samtidig optager den under lanternen (5; 21) anbragte flade del (19; 29) ved hjælp af møtrikker (20).Centrifugal pump assembly according to claim 6, characterized in that the draw anchors (18) simultaneously receive the flat part (19; 29) arranged under the lantern (5; 21) by means of nuts (20).

8. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at mellemrøret (17) er forsynet med over den samlede omkreds forløbende noter, i hvilke en respektive med opdelingsfuger forsynet løs flange griber ind ved hjælp af ét eller flere på sin indre omkreds anbragte fremspring, hvor denne løse flange er forbundet med den flade del (19; 29) overskrueforbindelser.Centrifugal pump assembly according to one of the preceding claims, characterized in that the intermediate pipe (17) is provided with grooves extending over the entire circumference, in which a respective loose flange provided with a splitting joint engages one or more on its inner circumference. projections in which this loose flange is connected to the flat portion (19; 29) of the head screw connections.

9. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at mellemrøret (17) er forsynet med udtag, i hvilke holdeelementer (28) griber formsluttende ind, hvor holdeelementerne (28) hver støtter en med boringer til optag af skrueforbindelser forsynet løs flange (27).Centrifugal pump assembly according to one of the preceding claims, characterized in that the intermediate tube (17) is provided with an outlet in which retaining elements (28) engage form-wise, the retaining elements (28) each supporting a loose flange with holes for receiving screw connections. (27).

10. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at mellemrøret (17) er forsynet med over den samlede omkreds forløbende noter, som hver optager en støttering, mod hvilken den løse flange (27) kommer i anlæg.Centrifugal pump assembly according to one of the preceding claims, characterized in that the intermediate tube (17) is provided with grooves extending over the entire circumference, each receiving a support ring against which the loose flange (27) abuts.

11. Centrifugalpumpeaggregat ifølge krav 9, kendetegnet ved, at mellemrøret (17) er forsynet med ensartet over omkredsen fordelte huller, som tjener til optag af stifter (28), der hver støtter den løse flange (27).Centrifugal pump assembly according to claim 9, characterized in that the intermediate tube (17) is provided with uniformly distributed holes over the perimeter, which serve for receiving pins (28), each supporting the loose flange (27).

12. Centrifugalpumpeaggregat ifølge krav 9, kendetegnet ved, at mellemrøret (17) er forsynet med ensartet over omkredsen fordelte huller, som tjener til optag af stifter (26), hvor hver af disse stifter (26) bærer en bøsning (25) til optag af en skrueforbindelse.Centrifugal pump assembly according to claim 9, characterized in that the intermediate tube (17) is provided with uniformly distributed holes over the perimeter, which serve for receiving pins (26), each of these pins (26) carrying a bushing (25) for receiving of a screw connection.

13. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at frontfladerne af mellemrøret (17) ligger an mod flangen (6) af lanternen (5; 21) og mod pumpehuset (11), navnlig mod dettes mod tryksiden vendende låg.Centrifugal pump assembly according to one of the preceding claims, characterized in that the front faces of the intermediate tube (17) abut the flange (6) of the lantern (5; 21) and against the pump housing (11), in particular against its pressure side cap.

14. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at én eller begge frontflader af mellemrøret (17) ligger an mod en yderligere løs flange.Centrifugal pump assembly according to one of the preceding claims, characterized in that one or both front faces of the intermediate tube (17) abut an additional loose flange.

15. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at mellemrøret (17) er dannet af i handelen almindeligt forekommende rørmateriale, som i påkommende tilfælde tilpasses ved forkortelse til de respektive forhold.Centrifugal pump assembly according to one of the preceding claims, characterized in that the intermediate pipe (17) is formed of commercially available pipe material which, if applicable, is adapted by shortening to the respective conditions.

16. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved, at der mellem den flade del (19; 29) og lanternen (5; 21) er anbragt afstandsholdere (24).Centrifugal pump assembly according to one of the preceding claims, characterized in that spacers (24) are arranged between the flat part (19; 29) and the lantern (5; 21).

17. Centrifugalpumpeaggregat ifølge krav 16, kendetegnet ved, at afstandsholderne dannes ved hjælp af hylstre (24).Centrifugal pump assembly according to claim 16, characterized in that the spacers are formed by sleeves (24).

18. Centrifugalpumpeaggregat ifølge krav 16, kendetegnet ved, at afstanden tilvejebringes ved hjælp af møtrikker (20), som er anbragt ovenover den flade del (19; 29) og nedenunder lanternen (5; 21).Centrifugal pump assembly according to claim 16, characterized in that the distance is provided by nuts (20) arranged above the flat part (19; 29) and below the lantern (5; 21).

19. Centrifugalpumpeaggregat ifølge ét af de foregående krav, kendetegnet ved et med et mellemleje (31) til akslen (3) udstyret mellemrør (17).Centrifugal pump assembly according to one of the preceding claims, characterized by an intermediate tube (17) equipped with an intermediate bearing (31) for the shaft (3).

20. Centrifugalpumpeaggregat ifølge krav 19, kendetegnet ved, at mellemlejet (31) er fastgjort ved hjælp af flere skruer (35), der gennemtrænger mellemrøret (17).Centrifugal pump assembly according to claim 19, characterized in that the intermediate bearing (31) is fixed by means of several screws (35) which penetrate the intermediate tube (17).

21. Centrifugalpumpeaggregat ifølge krav 20, kendetegnet ved, at tre jævnt over omkredsen anbragte skruer (35), som skal låses ved hjælp af møtrikker og kontramøtrikker, og som hver kan indstilles ved hjælp af et i mellemrøret (17) anbragt gevind, finder anvendelse.Centrifugal pump assembly according to claim 20, characterized in that three screws (35), evenly arranged over the circumference, lockable by nuts and counter nuts, each adjustable by means of a thread located in the intermediate tube (17), apply. .

22. Centrifugalpumpeaggregat ifølge krav 19, kendetegnet ved et i to ensartede halvdele (36) underinddelt mellemrør, hvor der mellem de to halvdele (36) er indeklemt en i sin kontur til frontfladerne af halvdelene (36) tilpasset bærer (37) til et mellemleje (38).Centrifugal pump assembly according to claim 19, characterized by a dividing pipe subdivided into two uniform halves (36), between which the two halves (36) are enclosed in a contour to the front surfaces of the halves (36) for a middle bearing. (38).

23. Centrifugalpumpeaggregat ifølge ét af kravene 19 til 22, k e n d e t e g n e t ved, at mellemlejet (31; 38) over en ledning (39) forsynes med smørevæske.A centrifugal pump assembly according to any one of claims 19 to 22, characterized in that the intermediate bearing (31; 38) is supplied with a lubricant liquid over a line (39).

24. Centrifugalpumpeaggregat ifølge krav 23, kendetegnet ved, at ledningen (39) er forbundet med det mod tryksiden vendende indre område af centrifugalpumpeag-gregatet.Centrifugal pump assembly according to claim 23, characterized in that the conduit (39) is connected to the inner region facing the pressure side of the centrifugal pump assembly.