EP2520806B1 - Motor pump unit - Google Patents

Description

The invention relates to a pump unit with the features specified in the preamble of claim 1.

Pump units of the type in question, which have an electric drive motor and a driven centrifugal pump, are at least pump-side designed as a submersible pump, that is, that the suction port of the pump is immersed in the liquid to be delivered. However, it may also be the entire pump unit designed as a submersible pump, as is one of the state of the art, for example in downhole pumps or basement drainage pumps.

It is particularly important in cutting oil and coolant pumps, as used in machine tools, the prior art, the suction port of the pump upstream of a swirl crusher and prevent that forms a funnel-shaped indentation at the water surface and sucked air with upwardly directed suction mouth or in downwardly directed suction mouth in certain areas increased suction occurs, which there particles or other deposits can be sucked with undesirable. In known cutting oil pumps with upwardly directed suction mouth this purpose, a swirl breaker is formed on the motor chair, which reduces such vortex formation.

JP 2010 190 184 discloses a pump with downwardly directed suction mouth and upstream swirl breaker.

Such pumps for cooling and cutting oils, as they are also referred to as immersion pumps, are offered with both upwardly directed suction mouth, as well as with bottom-side suction mouth.

Only in the former, however, the molded on the motor chair swirl breaker is desired, which means that in arrangements with suction mouth down another motor chair and possibly also a structurally different pump must be provided.

Against this background, the invention has the object, a generic pump unit in such a way that it is relatively cheaper to produce, especially taking into account the different types.

This object is achieved according to the invention by a pump unit with the features listed in claim 1. Advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the drawings.

The pump unit according to the invention has an electric drive motor and a driven centrifugal pump in the form of a submersible pump. The submersible pump has a suction mouth and a suction crusher upstream of the suction mouth. According to the invention, the swirl breaker is formed by at least one component which is releasably secured to the pump unit, wherein the swirl breaker component has an annular attachment portion which engages in the suction mouth of the pump. The basic idea of the present invention is not to design the component (s) that comprise the swirl breaker with the pump housing or the motor chair as in the prior art, but instead instead to form at least one or possibly also a plurality of separate components which can be detachably fastened to the pump assembly. so that they can only be applied to the construction projects in which they are required and, incidentally, that the pump set can be supplied and operated without these components.

The basic idea of the invention is therefore to provide a pump unit which can be used optionally with and without swirl breaker, without the need for structural changes or, apart from the swirl breaker component itself, other components.

The solution according to the invention has the advantage that, independently of pumps and motor design, the unit can be operated optionally with and without swirl breaker. In addition, this embodiment of the invention, in which the swirl breaker is designed as a separate releasably attached to the unit component, the advantage that with a suitable design of the component no structural adaptation to the use must be done with or without swirl breaker, so that the related components can be supplied for different purposes, d. H. reduces the variety of parts and thus the manufacturing and storage costs are reduced overall. Also can be retrofitted with the formation of the invention pumps with a swirl crusher or removed in pumps with a swirl crusher when not in use.

Particularly advantageous is the application of the inventive design in a pump unit, wherein the motor and pump are connected by a motor chair spaced, wherein the motor chair has at least one leg which line connects the pressure side of the pump with a close to the engine line connection of the pump unit, wherein the suction of the Pump is directed towards the engine and the at least one swirl breaker component is attached to the motor chair and / or the pump. This training relates in particular to the aforementioned submersible pump, in which in the prior art pumps with upwardly directed, so facing the engine suction mouth and those with downwardly directed suction mouth are available on the market. When such a pump, a swirl breaker is provided as in upwardly directed Saugmund is typical, then according to the invention this swirl breaker component can be provided as a detachable component, which is advantageously attached to the motor chair or the pump or both. In this embodiment, the otherwise customary Anformung a swirl breaker on the motor chair, which is usually designed as a casting omitted. One or more such swirl crushers can be clamped in a common or separate component in the region of the suction mouth of the pump, on the pump itself or the motor chair or on both, for example.

The motor chair has advantageous relative to the shaft axis two oppositely arranged legs, one of which forms the pressure line and the other has only support function. Such a two-legged design has the advantage that a comparatively stable connection between the pump and the motor is provided which makes it possible, despite a relatively long motor shaft, not to have to store it on the pump side, which is particularly favorable since a pump-side bearing often leads to problems. if the pumped liquid is not free of solid or abrasive substances.

The arrangement of two legs has the further advantage that the attachment of a swirl breaker component can be done in a simple manner that it is clamped between the legs of the motor chair. It is therefore independent of the pump attachment possible, which may be advantageous. According to the invention, the swirl breaker component is fastened on the pump side with an annular attachment portion, which engages in the suction mouth of the pump and defines the swirl breaker component there.

The determination of the swirl component can basically be done in a suitable manner, so for example by screwing, gluing, clamping or the like, a latching and / or clamping attachment is particularly advantageous because it can be done without tools.

In order to achieve such an attachment of the swirl breaker component to a leg of the motor chair, according to a development of the invention, provision is made for a clamp-shaped fastening section on the swirl breaker component, which surrounds one leg of the motor chair at least in sections, for example with a wrap angle of 200 °.

In order to fix the annular attachment portion in the suction mouth of the pump is provided according to a development of the invention to provide locking tongues on this annular attachment portion with which engages the spin crusher component latching in a suction mouth forming the pump housing. The latching tongues are advantageously formed in that recesses are provided in the annular attachment portion, which extend in the axial direction and between which locking tongues are formed.

Advantageously, the swirl breaker on a flat inner leg which extends radially inwardly from the edge of the suction mouth. Such a leg in the region of the suction mouth is particularly effective because it influences the flow in the immediate region of the impeller.

Conveniently, such an inner leg is integrally formed on the inside of the annular member, with which this is fixed in the suction port of the pump, ie in the corresponding opening of the pump housing. It can also be set several such legs there.

Alternatively or additionally, the swirl breaker may have a flat outer leg which extends outside of the suction mouth. In an embodiment in which the suction mouth is directed towards the engine, this flat outer leg is also directed towards the engine and advantageously extends radially between a leg of the motor chair and the drive shaft which projects from the engine through the suction mouth to the impeller. The arrangement in this area can effectively prevent the otherwise typical funnel vortex formation. It is particularly advantageous for liquids that are enriched with air to prevent additional air entry here.

A particularly intensive effect is achieved when an inner and an outer leg are provided and they are in relation to each other with respect to the axial direction of the shaft in alignment, that is axially connect to each other. Then the Ansaugwirbelbildung is effectively prevented from the impeller to wide areas in front of the suction port of the pump.

Also, the outer leg is advantageously integrally formed on the annular member, suitably on the side remote from the pump side.

The swirl breaker according to the invention may be formed in one or more legs or in another suitable manner. It is also possible for a plurality of swirl crushers to be distributed over the circumference or over the inlet area. It is expedient to connect a plurality of swirl breakers by means of a connecting element to a swirl breaker component in order to produce and install in this way, if possible, only one component.

Advantageously, the swirl breaker component can increase the seal between the suction side and the pressure side of the pump, ie at the same time as a seal be educated. As a sealing surface is preferably the engaging in the pump housing opening part of the annular member, namely the end face of this component.

In order to prevent objects inadvertently falling from above into the suction mouth of the pump and leading to damage or jamming, according to an advantageous development of the invention, a protective cover can be provided on the swirl body component, which is arranged at a distance from the suction mouth above it. Such a protective cover may be integrally formed on the upper end of the swirl breaker, that is, for example, the ends of the outer limbs pointing towards the engine.

It is particularly advantageous if such a swirl breaker component is designed as a one-piece injection-molded part, since this is cost-effective to manufacture and can be mounted by simply clicking on it, if the structural design is carried out as described above. Alternatively, of course, a screw fastening this component or other suitable form-locking attachment is conceivable.

Fig. 1

in stark vereinfachter schematischer Darstellung einen Längsschnitt durch eine Eintauchpumpe gemäß der Erfindung,

Fig. 2

eine perspektivische Ansicht der Pumpe nach Fig. 1 auf den Saugmund der Pumpe,

Fig. 3

in perspektivischer Ansicht das Drallbrecherbauteil der Pumpe gemäß den Fig. 1 und 2,

Fig. 4

in perspektivischer Darstellung das Pumpenlaufrad der Pumpe gemäß den Fig. 1 und 2,

Fig. 5

einen Schnitt durch das Pumpenlaufrad gemäß Fig. 4,

Fig. 6

einen Schnitt durch ein Pumpenlaufrad für eine Bauvariante der Pumpe mit nach unten gerichtetem Saugmund,

Fig. 7

in vergrößerter Schnittdarstellung den Boden der Pumpe nach Fig. 1,

Fig. 8

den Boden der Pumpe für das Laufrad gemäß Fig. 6 mit nach unten gerichtetem Saugmund in Darstellung nach Fig. 7, und

Fig. 9

das Pumpenaggregat mit nach unten gerichtetem Saugmund in Darstellung nach Fig. 1.

The invention is explained in more detail with reference to an embodiment shown in the drawing. Show it:

Fig. 1

in a highly simplified schematic representation of a longitudinal section through a submersible pump according to the invention,

Fig. 2

a perspective view of the pump after Fig. 1 on the suction mouth of the pump,

Fig. 3

in perspective view of the swirl breaker component of the pump according to the Fig. 1 and 2 .

Fig. 4

in perspective view of the pump impeller of the pump according to the Fig. 1 and 2 .

Fig. 5

a section through the pump impeller according to Fig. 4 .

Fig. 6

a section through a pump impeller for a construction variant of the pump with downwardly directed suction mouth,

Fig. 7

in an enlarged sectional view of the bottom of the pump Fig. 1 .

Fig. 8

the bottom of the pump for the impeller according to Fig. 6 with downward directed suction mouth in representation after Fig. 7 , and

Fig. 9

the pump unit with downwardly directed suction mouth in representation after Fig. 1 ,

In the pump unit shown in the figures is an immersion pump with an electric drive motor 1 arranged at the upper end, which is fixed to a motor chair 2, which connects the drive motor 1 with a centrifugal pump 3 located at the lower end. In the case of Fig. 1 Pump unit shown, the bottom 4 of the pump 3 is formed closed, as in detail in particular Fig. 7 evident. The suction port 5 of the pump 3 is directed towards the drive motor 1, ie in the operating state as shown Fig. 1 up.

The suction mouth 5 is formed by a circular opening in the top of the pump housing, which is formed here by the foot of the motor chair 2. Within this pump housing, a rotary wheel 6 is rotatably driven, which is fixed to the end of a shaft 7 extending from the drive motor 1 through the motor chair 2 to the pump 3. The shaft 7 is mounted exclusively on the motor side, namely in an upper bearing 8 and a lower bearing 9, which is arranged in the motor chair 2 at the lower end of the drive motor 1. The impeller 6 is formed as an open impeller and has only a cover plate 10 which is disposed near the bottom of the pump housing. The structure of the impeller 6 is in detail the 4 and 5 refer to. It is attached to the front end lower end of the shaft 7 and is supported by this.

The suction port 5 of the pump 3 is centrally penetrated by the shaft 7, bounded by the rest by the edge of the pump housing. The pump housing is formed in the illustrated embodiment on its upper side by the motor chair 2. The pump housing thus consists essentially of the in Fig. 7 shown cup-shaped structure and is completed at the top by the motor chair 2.

The motor chair 2 has two relative to the axis of the shaft 7 offset by 180 ° arranged legs 11 and 12. While that in Fig. 1 Left leg 11 has only static function, the right leg 12 is formed as a pressure channel, thus connecting the pressure side of the pump 3 with the molded also on the motor chair 2 near the drive motor 1 connecting piece 13, which serves to connect a line.

In operation, the pump 3 shown is arranged so that the pump 3 is located with the suction port 5 within the liquid to be conveyed, whereas the drive motor 1 and the connecting piece 13 are arranged above the liquid level. To prevent, that when pumping, starting from the liquid surface in the direction of the shaft 7 to the suction port 5 forms a funnel-shaped indentation, which is particularly suitable to suck air into the liquid to be conveyed, a swirl breaker member 14 is provided in the suction 5 of the pump 3 and between the legs 11 and 12 of the motor chair 2 is fixed.

This swirl breaker component 14 is integrally formed as a plastic injection molded part and clamped. It has two swirl crushers 15 and 16, which are integrally formed on a common annular part 17, d. H. are attached. The annular part 17 is cylindrical on its inside and cylindrically stepped on the outside, such that it in the suction port 5 of the pump 3, d. H. the corresponding housing recess in the pump housing, which is formed here by the corresponding recess in the foot of the motor chair 2, can be inserted. In this case, the stepped projecting part 18 ensures that the component rests on the edge of the opening, whereas the rest, engaging in the opening part causes a radial support. In this part tongues 10 are formed by axial recesses, which are provided with locking lugs 21, which deflect when plugged into the suction mouth and lock back and thus fix the component in the axial direction.

Each of the swirl crushers 15, 16 has an inner, on the annular part 17 radially inwardly extending flat leg 22 and an axially aligned subsequent flat outer leg which extends well beyond the annular member 17 in the direction of the drive motor and on the one hand extends to close to the leg 11 and on the other hand, namely on the pressure channel forming leg 12 by means of a molded there, in cross-section C-shaped form-fitting element 24, the leg 12 of the motor chair 2 surrounds by about 180 ° and thus rotatably secured the swirl breaker member 14. The swirl breakers 15 and 16 thus extend inwardly to near the Wave 7 and out to close to the leg 11 and to the leg 12 zoom. Due to the above-described shaping, this swirl breaker component 14 can be fastened by simply clicking in, and then automatically remains in this position. By the two-surface swirl breaker 15 and 16, which extend into the suction mouth 5 and extend upwards, so the drive motor 1 out flat, the unwanted spin-induced vortex formation can be effectively prevented in the intake.

As based on Fig. 1 represented by the hatched areas 28, the swirl breaker member 14 may be provided with a protective cover 28, which surrounds the shaft 7 annularly extending to the legs 11, 12. This protective cover can be designed like a sieve, that is to say have perforations, and serves to prevent parts which accidentally fall from above in the direction of the suction mouth 5 from entering the interior of the pump. This protective cover, which covers the suction mouth 5 at a distance, is exemplary only in Fig. 1 The further illustrations show a swirl breaker component 14 without such a protective cover.

The swirl breaker component 14 is dimensioned in the region of the annular part 17 such that the part engaging in the pump housing extends to just in front of the rotary wheel 5, so that the end face 27 forms a sealing surface between suction and pressure part of the pump. This brought up to the impeller 6 sealing surface 27 increases the efficiency of the pump and is part of the swirl breaker component 14. If in the region of the sealing surface 27 due to wear replacement is required, then only the cost-effective and manufactured as an injection molded spin crusher component 14 is to be replaced.

As the execution of the basis of Fig. 9 shown pump unit, can without this swirl breaker component 14 with only minor constructive changes with virtually the same components a pump unit are created, which has a downward suction mouth 5a. For this purpose, first, the bottom of the pump housing to train accordingly, ie to provide with a suction opening, as in Fig. 8 is shown. Furthermore, the gyro wheel 6a is as in FIG Fig. 6 shown, constructively adapt. Like a comparison of Fig. 5 and 6 illustrates, however, only the cover plate 10 and 10a in Fig. 6 differently form, namely with a rear ring 25, moreover, the receptacle for the end of the shaft 7 is to extend accordingly. The arrangement and design of the blades themselves can remain unchanged. Continue to remain unchanged drive motor 1 and motor chair 2, as far as the mold-side training is concerned. It is only an annular groove 26 in the lower end face of the motor chair 2 introduce to form the formed by the ring 25 and the groove 26 labyrinth seal. Since the underside of the motor chair 2 forming the upper side of the pump housing is to be machined anyway, in order to obtain a planar contact surface, the annular groove 26 can be introduced with practically little extra effort in terms of production without additional set-up times. The same applies to the cover plate machining and machining of the pump housing.

As the above explanations make clear, the motor chair 2 can be used both for a pump version with suction mouth top as well as for a pump version with suction mouth below by the click-in swirl breaker component 14. The production engineering changes of pump impeller and pump housing are conceivable low.

In addition, if desired, the swirl breaker component 14 according to the invention can also be attached to the underside, that is, to the suction mouth 5a, in order to provide a suction mouth arrangement on the underside, as they are in Fig. 9 is shown to reduce Ansaugwirbelbildung down.

LIST OF REFERENCE NUMBERS

1

- Drive motor

2

- Motor chair

3

- Centrifugal pump

4

- Ground

5

- Suction mouth

5a

- Suction mouth down

6

- rotary wheel

6a

- Rotary impeller for suction mouth down

7

- Wave

8th

- Stock up

9

- Stock below

10

- Cover disc of the centrifugal wheel

10a

- Cover disc of the impeller 6a

11

- leg

12

- leg, pressure channel

13

- Connecting piece

14

- Swirl breaker component

15

- swirl breaker

16

- swirl breaker

17

- annular part

18

- cantilevered part

19

- axial recesses

20

- tongues

21

- latching noses

22

- inner thigh

23

- outer thigh

24

- C-shaped positive locking element

25

- Ring

26

- annular groove

27

- sealing surface

28

- protective cover

Claims (16)

1. A pump assembly with an electric drive motor (1) and with a centrifugal pump (3) in the form of a submersible pump, with a suction port (5) and with a vortex-breaker (15, 16) arranged in front of the suction port (5) which is formed by at least one component (14) which is releasably fastened on the pump assembly, characterised in that the vortex-breaker component (14) has an annular fastening section (17) which engages into the suction port (5) of the pump (3).
2. A pump assembly according to claim 1, characterised in that the motor (1) and the pump (3) are connected in a distanced manner by a motor base (2), that the motor base (2) comprises at least one leg (12) which conductively connects the pressure-side of the pump (3) to a conduit connection (13) of the pump assembly which is arranged close to the motor, that the suction port (5) is directed to the motor (1) and that the at least one vortex-breaker component (14) is fastened on the motor base (2) and on the pump (3).
3. A pump assembly according to claim 1 or 2, characterised in that the motor base (2) comprises two legs (11, 12) which are arranged lying opposite with respect to the shaft axis of the motor (1).
4. A pump assembly according to one of the preceding claims, characterised in that the at least one vortex-breaker component (14) is clampingly fixed between the legs (11, 12) of the motor base (2).
5. A pump assembly according to one of the preceding claims, characterised in that the vortex-breaker component (14) comprises a clip-like fastening section (24) which at least in sections engages around at least one leg (12) of the motor base (2).
6. A pump assembly according to one of the preceding claims, characterised in that the annular fastening section (17) comprises locking tongues (20) which are preferably formed by recesses (19) and with which the vortex-breaker component (14) can be fixed in a locking manner in an opening of the pump housing which forms the suction port (5).
7. A pump assembly according to one of the preceding claims, characterised in that the vortex-breaker (15, 16) comprises a flattish inner limb (22) which extends radially inwards from the edge of the suction port (5).
8. A pump assembly according to one of the preceding claims, characterised in that the inner limb (22) is integrally formed on the inner side of the annular component (17).
9. A pump assembly according to one of the preceding claims, characterised in that the vortex-breaker (15, 16) comprises a flattish outer limb (23) which extends outside the suction port (5) preferably in the direction to the motor (1) and specifically radially between the shaft (7) and a leg (11, 12) of the motor base (2).
10. A pump assembly according to one of the preceding claims, characterised in that the inner limb (22), seen in the axis direction of the shaft (7), lies aligned to the outer limb (23) and connects onto this axially.
11. A pump assembly according to one of the preceding claims, characterised in that the outer limb (23) is integrally formed on the upper side of the annular component (17).
12. A pump assembly according to one of the preceding claims, characterised in that several vortex-breakers (15, 16) are connected by way of a connection element (17), into a vortex-breaker component (14).
13. A pump assembly according to one of the preceding claims, characterised in that the vortex-breaker component (14) forms a seal between the suction side and the pressure side of the pump (3).
14. A pump assembly according to one of the preceding claims, characterised in that the part of the annular component (17) which engages into the opening of the pump housing has an end-face (27) which forms a sealing surface.
15. A pump assembly according to one of the preceding claims, characterised in that the vortex-breaker component (14) comprises a protective covering (28) which covers the suction port (5) of the pump (3) at least partly at a distance.
16. A pump assembly according to one of the preceding claims, characterised in that the vortex-breaker component (14) is formed by a single-piece injection moulding part.

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