DE202016105312U1 - feed pump - Google Patents

Abstract

Feed pump for fluid media, in particular circulating pump for swimming pools or swimming pools, comprising a pump housing (35), an impeller (19) arranged in the pump housing (35) and mounted rotatably on a pump shaft (22), a drive unit (27, 28) , which is connectable to a drive motor (32), wherein the drive unit (24, 25, 27, 28) and the pump shaft (22) via inner and outer magnets (25, 28) which are separated by a split pot (29) , are in magnetic operative connection with each other, characterized in that the drive unit (24, 25, 27, 28) an inner rotor (27) on which the inner magnets (28) are arranged and the non-rotatably with a motor shaft (21) of the drive motor (32 ), and a non-rotatably connected to the pump shaft outer rotor (24), wherein the outer rotor (24) carries the outer magnet (25) and engages around the inner rotor (27).

Description

The present invention relates to a feed pump for fluid media, in particular a circulation pump for swimming pools or swimming pools or a feed pump for fluid chemicals in the system engineering, with a pump housing, arranged in the pump housing impeller which is rotatably mounted on a pump shaft, and a drive unit, which is connectable to a drive motor, wherein the drive unit and the pump shaft are in magnetic operative connection with each other via inner and outer magnets, which are separated from each other by a containment shell. Because of this magnetic drive concept such pumps are also referred to as magnetic coupling pumps.

Magnetic clutch pumps are among the most versatile types of pumps. They are robust and capable of delivering fluids of varying densities, from gases to liquids, at temperatures up to 400 ° C. The pump part of a magnetic coupling pump usually corresponds to a conventional centrifugal pump and has a non-rotatably mounted on a pump shaft radial impeller. While in a conventional pump, the pump shaft is mechanically coupled to the drive motor, has a typical magnetic coupling pump driven by an electric or internal combustion engine cup-shaped drive member with an outer rotor, on the inner surfaces of which outer magnets are arranged radially. In the heretofore known magnetic drive pumps, an inner rotor connected to the pump shaft, on the outer surface of which inner magnets are arranged, is surrounded at its engine facing end by the outer rotor of the drive member so that the outer and inner magnets are opposed to the reverse polarity. The inner rotor is hermetically separated from the outer rotor by means of a split pot, the inner magnets of the inner rotor being in magnetic operative connection with the outer magnets of the outer rotor over the split pot. Due to the hermetic separation of the inner rotor from the outer rotor through this split pot, which thus replaces the corresponding shaft seals of conventional motor-driven pumps, a leak-free delivery of the fluids is possible. The storage of the pump shaft is usually carried out by a plurality of plain bearings, which radially and axially support the inner rotor and the pump shaft and which are typically lapped for lubrication and cooling of the pumped liquid.

Due to the necessary use of permanent magnets magnetic coupling pumps are more expensive than corresponding pumps in which the pump shaft is mechanically connected to the drive motor. Therefore, magnetic coupling pumps have not yet been used in areas where there is a particularly high cost pressure, for example in the field of circulation pumps for swimming pools and swimming pools, where the clientele often consists of public and private end users. Meanwhile, however, permanent magnets are available at such low cost that magnetic coupling pumps can also be used in such areas. At the same time, the legal requirements for the energy efficiency of electric motors, which are preferably used for magnetic drive pumps as driving motor, are increasing more and more, so that from January 2017 for motor powers from 0.75 kW compliance with a minimum efficiency IE3 in the EU is legally required (energy efficiency classification according to IEC 60034-30 ). The engine manufacturers can only meet these requirements by installing high-quality components, so that, for example, more copper has to be used for the windings of electric motors. The engines are not only more efficient, but then have a larger torque when starting the engine. In the case of a magnetic coupling pump there is the risk of slippage in this case, ie the magnetic contact of the magnets of the rotor of the pump tears off so that the impeller can no longer be set in rotation despite the rotating motor.

The present invention is therefore based on the technical problem of providing a pump for fluid media, in particular a circulation pump for swimming pools and swimming pools, which allows the use of a magnetic drive and is also particularly cost-effective to produce energy-efficient drive motors.

This technical problem is solved by a feed pump with the features of the present claim 1. Advantageous developments of the feed pump according to the invention are the subject of the dependent claims.

According to a first aspect of the invention, the invention therefore solves the technical problem by reversing the assignment of the inner and outer rotors, which are separated by a containment shell, compared with conventional magnetic coupling pumps. In conventional magnetic coupling pumps, namely, the rotor connected to the motor shaft is designed as an outer rotor specifically with respect to a high tightening torque while the inner rotor is connected to the pump shaft, in the pump of the present invention, the outer rotor is connected to the pump shaft and the inner rotor is connected to the drive motor. The subject of the present invention is thus a feed pump for fluid media referred to above Type, which is characterized in that the drive unit comprises an inner rotor, on which the inner magnets are arranged and which is non-rotatably connected to a motor shaft of the drive motor, and an outer rotor rotatably connected to the pump shaft, wherein the outer rotor carries the outer magnet and engages around the inner rotor ,

Already due to the fact that the motor now drives an inner rotor instead of an outer rotor, the tightening torque acting on the outer rotor connected to the pump shaft is reduced, which reduces the danger of slippage when starting the engine.

Preferably, it is also provided that the inner rotor has additional weights which serve to increase the mass moment of inertia of the inner rotor and thus act as a starting brake. Therefore, the additional weights slow down the start of the engine in the first few seconds after switching on, so that the risk of tearing of the magnetic coupling is reduced and the outer rotor can start synchronously to the inner rotor. Surprisingly, it was found that despite the additional weights with the engine running no increased energy consumption is observed.

The additional weights can be adjusted in the function for increasing the moment of inertia of the respective engine power and the efficiency of the engine, so that for example the same feed pump can be used with motors in a power range of 0.75 to 2.2 kW.

The additional weights can be integrated into the inner rotor, for example, be sprayed as metal rings with an inner rotor made of die-cast metal or plastic. According to a preferred embodiment of the invention, the additional weights are designed as a flywheel, which is preferably replaceably mounted on the inner rotor. For example, the flywheel can be easily replaced by discs of different thicknesses or different materials, thus modifying the effect of the starting brake and adapting it to engine performance. Such a flywheel also ensures, with its circularly symmetrical mass distribution, an equalization of the rotation of the inner rotor, so that a tearing off of the magnetic coupling during load fluctuations can be avoided.

When the outer rotor is made of the same material as the pump shaft, for example, the pump shaft and the outer rotor can be manufactured as an injection molded part. When using different materials, the outer rotor and the pump shaft can be interconnected in a variety of ways. For example, the outer rotor can be sprayed onto the pump shaft, so that pump shaft and outer rotor in turn form a one-piece component.

The outer rotor has at its motor end a pot-like general shape, wherein the dimensions are selected so that the outer rotor engages around the inner rotor and the split pot disposed between the inner rotor and outer rotor.

Preferably, the impeller of the feed pump is exchangeably plugged onto the pump shaft rotatably and fixed, for example by means of a screw and / or tolerance rings, which simplifies the maintenance of the pump.

The feed pump also preferably includes a fluid circuit via which for cooling and lubricating the bearings of the outer rotor, the can and the seal housing. This fluid circuit is configured more complex than in a conventional magnetic coupling pump, in which fluid only needs to be guided close to the axis of the pump shaft to the plain bearings. In the pump according to the invention is proposed to lead a portion of the fluid from a pressure chamber of the feed pump to the outer rotor and the pump shaft and then axially back along the pump shaft to the impeller and from there radially on the back of the impeller back into the pressure chamber of the feed pump. For this purpose, the feed pump preferably has a seal housing, in which the outer rotor is arranged and which together with the containment shell defines a part of the fluid housing provided for cooling and lubrication.

The pump shaft is preferably rotatably supported by at least one slide bearing, particularly preferably two slide bearings, wherein the slide bearings are cooled and lubricated by the conveyed medium carried in the fluid circuit. As plain bearings preferably ceramic plain bearings are used.

According to a preferred embodiment, the feed pump has an axial suction opening, through which the medium to be conveyed is sucked by the impeller and, for example, is conveyed radially into the pressure space on the outer circumference of the impeller.

The feed pump according to the invention can be used for different purposes, for example as a feed pump for fluid chemicals in systems engineering or as a circulation pump for swimming pools or swimming pools. In particular, in the case of the use of the feed pump according to the invention as a circulation pump, a fiber catcher is preferably arranged in front of the suction opening of the feed pump. The fiber catcher can via a hose or a pipe with the suction port be connected, but preferably the Faserfänger is integrated directly in front of the suction port of the pump in the pump housing.

The drive unit of the feed pump according to the invention may have a drive shaft which is centrally mounted in the inner rotor or sprayed with this, and which can be connected via a mechanical coupling with a motor shaft of a drive motor.

In a particularly compact embodiment of the feed pump according to the invention, the inner rotor has a central bore, in which the motor shaft of a drive motor can engage in rotation, so that the drive motor can be flanged directly to the drive unit of the pump.

The invention is explained in more detail below with reference to a preferred embodiment illustrated with reference to the attached drawings. In the drawings show:

1 a trained as a circulation pump for swimming pools invention feed pump in partial cross section;

2 an enlarged detail view of the sectional view of 1 ;

3 an isolated view of the outer rotor of 1 and 2 in cross-section;

4 the outer rotor of 3 in perspective partial cross-section;

5 an isolated view of the inner rotor of 1 and 2 in cross-section;

6 the inner rotor of the 5 in perspective view;

7 an isolated view of the split pot of the feed pump of 1 and 2 in cross-section;

8th a plan view of the containment shell of 7 ;

9 an isolated view of the seal housing of the feed pump of 1 and 2 in cross-section; and

10 a plan view of the seal housing the 9 ,

In the 1 and 2 is a total with the reference number 10 designated embodiment of the feed pump according to the invention. 2 shows an enlarged detail view of the 1 , The illustrated pump 10 can be used, for example, as a circulation pump for swimming pools or swimming pools. The pump 10 has a suction nozzle 11 on, which in an entrance opening 12 an upstream fiber catcher 13 empties. The fiber catcher 13 includes a filter basket 14 , which has one on top of the fiber catcher 13 provided opening 15 is removable. The opening 15 of the fiber catcher 13 is through a screw cap 16 locked. An outlet 17 the fiber catcher opens into an axial suction opening 18 the feed pump. To the suction opening 18 closes a radial impeller 19 on, which sucks the fluid to be delivered axially and radially into a pressure chamber 20 transported the feed pump. From the pressure room 20 is the fluid to be delivered via a discharge nozzle 21 derived.

The impeller 19 stuck on a free end of a pump shaft 22 and is there by tolerance ring and a screw 23 fixed against rotation. On the pump shaft 22 is an outer rotor 24 sprayed. The pump shaft 22 and the outer rotor 24 are also isolated in the 3 and 4 shown in more detail. That the impeller 19 opposite end of the outer rotor 24 is cup-shaped and has outer magnets 25 on, on the inner circumference of the outer rotor 24 are arranged. The outer magnets 25 are permanent magnets, which can be plugged, for example, on the outer rotor in Nuttaschen or encapsulated by this. In the example shown, the outer magnets are made by means of a steel ring 26 in a recess of the outer rotor 24 fixed. The recess is in the example shown by a frontal cover 50 gas-tight welded. In through the outer rotor 24 formed pot is an inner rotor 27 , on its outer periphery, the outer magnet 25 of the outer rotor 24 opposite, inside magnets 28 are arranged. The inner rotor is insulated and detailed in the 5 and 6 shown. Between the outer rotor 24 with its outer magnets 25 and the inner rotor 27 with its inner magnet 28 is a containment shell 29 arranged, which consists of a non-magnetizable material. The containment shell 29 is isolated and more detailed in the 7 and 8th shown.

The inner rotor 27 has a drive shaft bore 30 into which a motor shaft 31 one to the feed pump 10 flanged drive motor 32 can intervene rotatably. In the drive motor 32 it may be, for example, an electric motor.

To reduce a possible slip when switching on the drive motor 32 has the inner rotor 27 a flywheel 33 on, the non-rotatably with the motor-side end face of the inner rotor 27 is connected and serves as additional weight to slightly delay the tarnishing of the inner rotor immediately after switching on the drive motor, so that the magnetic coupling between inner magnet 28 and external magnets 25 does not break off in this phase. To adapt to different engine power is the flywheel 33 exchangeable trained and by means of two screws 34 on the motor-side end of the inner rotor 27 attached.

The pump 10 has a pump housing 35 on which the impeller 19 and the pressure room 20 surrounds. To the pump housing 35 closes an intermediate housing 36 on, which consists of inner rotor and outer rotor drive unit of the feed pump 10 surrounds. Inside the intermediate housing 36 is a seal housing 37 arranged, which together with the containment shell 29 a fluid channel 38 for a fluid for cooling and lubricating the outer rotor and the bearings of the pump shaft forms. The seal housing 37 is isolated in the 9 and 10 shown in more detail.

The containment shell 29 has on its outer periphery a plate-like collar 39 on top of the screws 40 is connected to the seal housing and serves as a motor-side cover for the seal housing. For reliable sealing is between acting as a cover for the seal housing collar 39 of the can 29 and the seal housing 37 an O-ring 41 arranged. Depending on the pumped medium, the screws 40 through plugs 51 be protected from the pumped medium. For example, for use in the chemical field, plugs and o-rings made of a chemical resistant material, such as a fluoroelastomer or an ethylene-propylene-diene rubber, may be used. In the 1 and 2 is exemplary only the upper screw 40 with a stopper 51 Mistake.

In particular, in the enlarged view of 2 is the central area of the feed pump 10 out 1 better recognizable. Additional arrows symbolized in 2 the fluid circuit for lubrication and cooling of the drive component. It can be seen that between a pump-side cover 42 the seal housing and the seal housing 37 openings 43 are omitted, via which fluid from the pressure chamber 20 in a distribution space formed by the seal housing 44 can reach. From the distribution room 44 the fluid passes over in an inner wall 45 of the seal housing 37 recessed openings 46 in the fluid channel 38 , There, the fluid flows around the pot-like area of the outer rotor 24 and the outer surface of the split pot 29 between outer rotor 24 and containment shell 29 and passes through openings provided in the outer rotor 47 in the channel 38 back.

In the example shown, the pump shaft 22 each at their ends by a ceramic plain bearing 48a . 48b stored. Each is a component 48a connected to the seal housing or the split pot, while the other component 48b with the pump shaft 22 or the sprayed onto the pump shaft end of the outer rotor 24 connected is. The pump-side lid 42 has a central opening through which projects the impeller-side end of the pump shaft. About the annular gap formed between the pump shaft and the inner edge of the opening, the fluid passes into a on the back of the impeller in the lid 42 trained radial gap 49 , over which the fluid in turn towards the pressure chamber 20 can be directed.

In the 3 and 4 is the outer rotor 24 the feed pump according to the invention 10 shown in more detail. It can be seen that the cup-shaped housing of the outer rotor 24 in which the outer magnets 25 by means of steel ring 26 are fixed on the motor-side front end by means of a lid 50 is welded gas-tight. At the impeller end of the outer rotor is the outer rotor 24 on the pump shaft 22 sprayed. Furthermore, those with the outer rotor 24 connected components 48b represented the two ceramic plain bearings.

In the 5 and 6 is the inner rotor 27 the pump according to the invention with screwed flywheel 33 shown. It can be seen in particular in the perspective view of 6 the inner magnets glued distributed on the outer circumference of the inner rotor 28 that also like the outside magnets 25 of the outer rotor are formed as permanent magnets.

In the 7 and 8th is the containment shell 29 shown in more detail in cross section and in plan view. The cross section corresponds to that in the 8th indicated section along the line VII-VII. It also recognizes the connected to the containment shell component 48a the ceramic plain bearing, as well as acting as the motor-side cover of the seal housing collar 39 the containment shell, which is designed as a one-piece component with the containment shell.

In the 9 and 10 is the seal housing 37 shown in more detail in cross section and in plan view. In 10 is the cut of the 9 indicated by the line IX-IX. In the example shown, the seal housing 37 a complex injection molded part that has an inner wall 45 to form a distribution chamber 44 having for serving as a coolant and lubricant partial flow of the pumped medium. One recognizes further the with the Seal housing connected component 48a of the ceramic plain bearing.

LIST OF REFERENCE NUMBERS

10

 feed pump

11

 suction

12

 Entry opening of the fiber catcher

13

 Strainer

14

 filter basket

15

 opening

16

 screw

17

 outlet opening

18

 suction opening

19

 Wheel

20

 pressure chamber

21

 pressure port

22

 pump shaft

23

 screw

24

 outer rotor

25

 external magnet

26

 steel ring

27

 inner rotor

28

 interior magnet

29

 containment shell

30

 Drive shaft bore

31

 motor shaft

32

 drive motor

33

 flywheel

34

 screw

35

 pump housing

36

 intermediate housing

37

 seal housing

38

 fluid channel

39

 Collar / lid

40

 cover screws

41

 O-ring

42

 cover

43

 openings

44

 distribution space

45

 Inner wall of the seal housing

46

 Opening in inner wall

47

 Opening in outer rotor

48a, b

 ceramic bearings

49

 radial gap

50

 Cover of the outer rotor

51

 Plug

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• IEC 60034-30 [0003]

Claims (12)

Feed pump for fluid media, in particular circulation pump for swimming pools or swimming pools, with a pump housing ( 35 ), one in the pump housing ( 35 ) arranged impeller ( 19 ), which rotatably on a pump shaft ( 22 ), a drive unit ( 27 . 28 ), which are powered by a drive motor ( 32 ) is connectable, wherein the drive unit ( 24 . 25 . 27 . 28 ) and the pump shaft ( 22 ) via internal and external magnets ( 25 . 28 ) through a containment shell ( 29 ) are mutually in magnetic operative connection, characterized in that the drive unit ( 24 . 25 . 27 . 28 ) an inner rotor ( 27 ) on which the inner magnets ( 28 ) are arranged and the non-rotatably with a motor shaft ( 21 ) of the drive motor ( 32 ) is connectable, and a non-rotatably connected to the pump shaft outer rotor ( 24 ), wherein the outer rotor ( 24 ) the outer magnets ( 25 ) and the inner rotor ( 27 ) surrounds. Feed pump according to claim 1, characterized in that the inner rotor ( 27 ) Additional weights ( 33 ), which act as a start-up brake. Feed pump according to claim 2, characterized in that the additional weights as a flywheel ( 33 ) are formed. Feed pump according to claim 4, characterized in that the flywheel ( 33 ) replaceable on the inner rotor ( 27 ) is mounted. Feed pump according to one of claims 1 to 3, characterized in that the outer rotor ( 24 ) on the pump shaft ( 22 ) is sprayed on. Feed pump according to claim 5, characterized in that the impeller ( 19 ) replaceable on the pump shaft ( 22 ) is attached. Feed pump according to one of claims 1 to 5, characterized in that a fluid circuit is provided, via which for cooling and lubrication of the outer rotor ( 24 ) and the pump shaft ( 22 ) a part of the conveying medium from a pressure chamber ( 20 ) of the feed pump to the outer rotor ( 24 ) and the pump shaft ( 22 ) can be performed. Feed pump according to claim 7, characterized in that the outer rotor ( 24 ) in a seal housing ( 37 ), which is connected to the containment shell ( 19 ) a fluid channel ( 38 ) defined as part of the fluid circuit for cooling and lubrication. Feed pump according to claim 8, characterized in that the pump shaft ( 22 ) by at least one sliding bearing ( 48a . 48b ) is rotatably mounted, wherein the sliding bearing is cooled and lubricated by the guided in the fluid circuit fluid. Feed pump according to one of claims 1 to 9, characterized in that the feed pump ( 10 ) an axial suction opening ( 18 ) having. Feed pump according to claim 10, characterized in that in front of the suction opening ( 18 ) a fiber catcher ( 13 ) is arranged. Feed pump according to one of claims 1 to 11, characterized in that a drive motor ( 32 ) to the drive unit ( 24 . 25 . 27 . 28 ) is flanged.

Images