DE102008036878A1 - rotary pump - Google Patents

Abstract

The invention relates to a centrifugal pump, in particular a one-stage or multi-stage side channel pump in link construction, wherein the / or each pump stage consists of a preferably divided link housing with associated rotary impellers, which are self-supporting and thus a known per se pump shaft is no longer required.

Description

The The invention relates to a centrifugal pump, in particular a on or Multi-stage side channel pump in sectional construction, with the / or each pump stage of a preferably divided link housing with an associated, rotatably mounted impeller,

Self-priming centrifugal pumps in sectional design are from the DE 755 269 known. The individual terms "2c" and "d" ( 1 ) form a pump stage with the centrifugal impeller "h". The centrifugal impeller is mounted on a continuous, rotatably mounted pump shaft. Such pumps are manufactured in multiple variants, ie with different pump stages, which are different in number and size. Therefore, a special pump shaft must be produced for each pump variant. Decisive for the pump shaft are the shaft diameter, the wavelength and the shaft material.

Because For each pump variant a special pump shaft is produced must become high manufacturing costs and on the other hand, high storage costs for the advice on pump shafts caused. The storage costs are not only incurred by the manufacturers the centrifugal pumps, but also among the users of such centrifugal pumps, especially if the user has several different types of pumps has in use and therefore for each pump variant pump shafts must keep in stock.

At the Pump manufacturers will increase storage costs even further that there must be two different bearings. Namely a warehouse for the wave raw material and a second bearing for the finished pump shafts.

Furthermore In the case of the known centrifugal pumps, the pump shaft must be in addition to the two bearings at the ends of the pump shaft in each housing member be stored, which in turn causes a variety of bearings.

Of the Invention is based on the object, a centrifugal pump, in particular to create a side channel pump, with a continuous on the Circular wheels carrying pump shaft can be dispensed with and thus the disadvantages of the known pumps can be avoided.

These Task is solved by each centrifugal impeller has an elongated hub, on the one hand an inner Recess and on the other hand provided with a neck, the in the inner recess of the following centrifugal impeller non-rotatable is pluggable.

With this embodiment of the centrifugal wheels wear this partially self-contained. Although the staging remains, decreases the number of bearings, reducing the total manufacturing costs Such centrifugal pumps are much cheaper.

through simple connections between the individual centrifugal wheels creates a self-supporting system for the centrifugal wheels, so that can be dispensed with a pump shaft.

One Embodiment of the invention is based on a drawing explained in more detail.

It shows:

1 a section through a centrifugal pump,

2 a representation as an exploded view with the connector between two wheels,

3 a frontal view in the direction of arrow "A" in 2 ,

A centrifugal pump 10 is as a multi-stage side channel pump in link construction with the limb housings 9a + 9b and a pump housing 18 formed, which is a suction stage 11 with suction nozzle 12 and a pressure level 13 with discharge nozzle 14 having. Between the two stages 11 + 12 are side channel stages 1a + 1b with self-supporting rotary wheels 2a + 2 B provided, the extended hubs 3a + 3b have, on the one hand inner recesses 5a + 5b and on the other hand with nozzles 4a + 4b are provided in the inner recess 5a respectively. 5b the following gyro wheel 2a respectively. 2 B can be inserted non-rotatably. In addition, the centrifugal wheels 2a + 2 B wing 7a + 7b as well as impeller body 8a + 8b on. In this embodiment, the hubs 3a + 3b on the side of the inner recesses 5a + 5b with the faces 6a + 6b the centrifugal wheels 2a + 2 B arranged in alignment, ie. they are not available, and on the other hand stand the nozzles 4a + 4b over the opposite end faces of the centrifugal wheels 2a + 2 B out. A drive shaft 15 on the one hand in a bearing housing 19 with a shaft bearing 16 rotatably mounted. The drive-side shaft end 20 is free for the connection of a drive motor, not shown. The opposite pump-side shaft end 21 is with a neck 22 hen in the inner recess 5a of the first rotary impeller 2a can be inserted non-rotatably. The stub 4a of the rotary impeller 2a is in the inner recess 5b of the second impeller 2 B plugged in. In addition, the gyro wheel is 2 B with a shaft journal 17 provided in the pump housing 18 is supported.

The essence of the invention is the fact that due to the self-supporting centrifugal wheels 2a + 2 B on a known per se, the centrifugal wheels 2a + 2 B bearing pump shaft can be omitted.

1a + 1b

Side channel stages

2a + 2b

Centrifugal impellers

3a + 3b

hub

4a + 4b

Support

5a + 5b

inner recesses

6a + 6b

faces

7a + 7b

wing

8a + 8b

impeller body

9a + 9b

segmental

10

rotary pump

11

suction stage

12

suction

13

pressure stage

14

pressure port

15

drive shaft

16

shaft bearing

17

shaft journal

18

pump housing

19

bearing housing

20

driving side shaft end

21

pump-end shaft end

22

Support the drive shaft

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 755269 [0002]

Claims (9)

Centrifugal pump ( 10 ), in particular a single-stage or multistage side-channel pump in sectional construction, wherein the / or each pump stage consists of a link housing ( 9 ) with an associated, rotatably mounted centrifugal impeller ( 2 ), characterized in that each gyro ( 2 ) an extended hub ( 3 ), on the one hand an inner recess ( 5 ) and on the other hand with a neck ( 4 ) provided in the inner recess ( 5 ) of the following centrifugal impeller ( 2 ) is inserted non-rotatably. Centrifugal pump according to claim 1, characterized in that the hub ( 3 ) on the side of the inner recess ( 5 ) with one of the end faces ( 6 ) of the centrifugal impeller ( 2 ) and on the other hand with the neck ( 4 ) over the opposite end face ( 6 ) of the centrifugal impeller ( 2 ) protrudes. Centrifugal pump according to claims 1 and 2, characterized in that the inner recess ( 5 ) and the neck ( 4 ) are formed as a non-rotatable connector. Centrifugal pump according to one of claims 1 to 3, characterized in that the centrifugal impeller ( 2 ) with the hub ( 3 ) and the neck ( 4 ) is formed in one piece. Centrifugal pump according to claim 4, characterized in that the centrifugal impeller ( 2 ) with the hub ( 3 ) and its inner recess ( 5 ) as well as with the neck ( 4 ) consists of a no longer machined casting. Centrifugal pump according to claim 5, characterized in that the centrifugal wheel ( 2 ) with the hub ( 3 ) and the neck ( 4 ) consists of malleable or similar material. Centrifugal pump according to claim 3, characterized in that the inner recess ( 5 ) as an inner polygon and the neck ( 4 ) are formed as an inner polygon adapted outer polygon. Centrifugal pump according to one of claims 1 to 7, characterized in that a drive shaft ( 15 ) on the one hand in a pump housing ( 18 ) and on the other hand in a bearing housing ( 19 ) with a shaft bearing ( 16 ) is rotatably mounted, wherein the drive-side shaft end ( 20 ) is exposed for connection of a drive motor and the opposite pump end ge shaft end ( 21 ) with a nozzle ( 22 ) provided in the inner recess ( 5a ) of the first rotary impeller ( 2a ) is inserted non-rotatably. Centrifugal pump according to one of claims 1 to 8, characterized in that the drive seen from the last centrifugal impeller ( 2 B ) with a shaft journal ( 17 ) in the pump housing ( 18 ) is supported.