EP2778424B1 - Groupe motopompe - Google Patents

Groupe motopompe Download PDF

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Publication number
EP2778424B1
EP2778424B1 EP14000461.5A EP14000461A EP2778424B1 EP 2778424 B1 EP2778424 B1 EP 2778424B1 EP 14000461 A EP14000461 A EP 14000461A EP 2778424 B1 EP2778424 B1 EP 2778424B1
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EP
European Patent Office
Prior art keywords
stator
circular
circular spline
profile
pump assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14000461.5A
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German (de)
English (en)
Other versions
EP2778424A2 (fr
EP2778424A3 (fr
Inventor
Günter Strelow
Andreas Eichmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
Original Assignee
Wilo SE
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Publication date
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Publication of EP2778424A3 publication Critical patent/EP2778424A3/fr
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Publication of EP2778424B1 publication Critical patent/EP2778424B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0626—Details of the can
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the invention relates to a pump unit with a pump unit and an electric motor driving this, comprising a stator and a rotor rotating in a rotor space, wherein the stator is separated from the rotor space by a split tube.
  • Such pump units are often used in applications as wet rotor, in which the rotor rotates in a liquid located in the rotor chamber. As a rule, this liquid is the pumped medium.
  • Such types of pump units can be found for example in heating circulation pumps and coolant pumps, borehole, service water and sewage pumps. In wet runner pumps, the rotor is thus washed by medium.
  • the stator is hermetically separated from this medium by a split tube.
  • the bearings of the rotor are lubricated by the medium.
  • Such constructions are maintenance-free and have a long service life.
  • DE 10 2011 014088 A1 discloses such a pump unit.
  • split tube is exposed to the high pressures in the pump chamber. For this reason, split tubes must have a high strength. It is known to produce metal cans. However, these have the disadvantage that, as a result of the stator field eddy currents are generated in the can, resulting in losses and the efficiency of the electric motor is significantly reduced.
  • the object of the invention is to provide a pump unit with a split tube, which can be designed to achieve a high efficiency of the unit particularly thin-walled, but at the same time holds high internal pressures in the rotor or pump room.
  • a pump unit with a pump unit and an electric motor driving this which has a stator and a rotating rotor in a rotor space, the stator is separated from the rotor space by a split tube and between the gap tube and the stator is a circular wedge connection, with the the split tube is supported on the stator.
  • the strength of the can with respect to internal pressure is increased by supporting it against the stator, in particular the stator core.
  • the stator in particular the stator core.
  • very precise tolerances and dimensions must be observed without any further measures. For plastic components, this is not possible depending on the material or very difficult and expensive.
  • the split tube may have a bottom at one axial end, so that the split tube forms a split pot.
  • the can is inserted in the axial direction into the stator with play. Subsequently, the outer surfaces of the split tube are brought into contact over a large area by a relative rotation between the stator and the can with the inner surfaces of the stator. As a result, the can is clamped against the stator and there is a uniform light surface pressure along the peripheral surface of the compound.
  • the clamping force i. the angle of rotation should not be particularly great. Incidentally, it must not be too large, because canned pipe forms a thin-walled hollow body which breaks when the clamping force is too high.
  • the split tube has an outer peripheral surface, which has a circumferential circle diverging from the circular inner circular spline. Seen in radial cross-section, the outer circumference of the can thus forms a base circle on which the wedge profile rises.
  • the split tube can thus be produced immediately together with the circular spline, in particular by injection molding as a plastic molded part.
  • the stator can basically have any desired structure, in particular have loop windings or else concentrated windings.
  • the stator has a central opening, also called bore, in which the rotor rotatably rests.
  • an inner surface of the stator delimiting the opening has, in the circumferential direction, at least one outer circular spline profile which deviates from the circular shape and is complementary to the inner circular spline profile.
  • the inner circumference of the stator consequently forms a base circle on which the complementary spline profile rises.
  • the two circular splines thus complement each other form-fitting, so that the split tube can be applied flat to the stator.
  • the stator has a plurality of pole shoes extending radially inwardly into the opening.
  • pole shoes extending radially inwardly into the opening.
  • a pole piece has an inner circumferential surface which partially delimits the central opening.
  • the can is positively and non-positively connected only to these pole shoes which are formed with the complementary circular wedge profile.
  • Said two pole shoes which have a circular wedge profile, are advantageously opposite one another, so that the split tube can be clamped between them.
  • a plurality of pole pieces in particular, every second pole piece can wear the outer circular spline.
  • all the pole shoes have an outer circular spline profile which deviates from the circular shape in the circumferential direction, so that the split tube fits all pole shoes, i. can support a large area.
  • the circular wedge connection can be formed by a circular wedge, two or more circular wedges and correspondingly a circular wedge, two or more complementary circular wedges.
  • the circular spline connection by three circular wedges on the outer peripheral surface of the split tube and three complementary Circular wedges on the inner peripheral surface of the stator form. This ensures that the circular wedge connection is self-centering and the split tube always rests concentrically in the stator.
  • the outer circular spline can be formed by a single circular wedge or by multiple circular wedges.
  • the complementary inner circular spline on the can has a single circular wedge or more circular wedges.
  • the circular wedge or the circular wedges can be arranged along the inner circumference of the stator such that each pole piece has on its inner peripheral surface a partial section of the circular wedge or one of the circular wedges. This means that two, more or in the case of a single circular wedge all pole shoes together form the circular wedge or a circular wedge proportionally. Also, a pole piece may have two or more circular wedges.
  • the outer circular spline is formed by a number of circular wedges, each pole piece has on its inner peripheral surface such a circular wedge.
  • the number of circular wedges corresponds to the number of stator poles.
  • the profile height of the inner circular spline can be comparatively small compared to the wall thickness of the can.
  • the inner circular spline has a profile height of 1/20 to 1/5, preferably 1/10 of the wall thickness of the can.
  • the slope of the circular wedges of the circular wedge connection between 1:20 to 1:50, so that the circular wedge connection can be solved for disassembly purposes again.
  • the contour of the circular wedges is designed as a logarithmic spiral. This has the advantage that the connection partners of the circular wedge connection not linear but surface contact. The can is optimally supported by the stator.
  • the circular wedge connection according to the invention offers the advantage that the split tube can also be fixed in the axial direction.
  • the split tube may have on its outer circumference a radial projection which engages behind the stator, in particular a pole piece (7), in the inserted and stressed state of the split tube.
  • this projection can be in the area between two pole shoes, for example. If the can is inserted axially, the projection is also twisted by its rotation and comes behind a pole piece to the plant. The split tube is thereby secured in the axial direction.
  • the electric motor of the pump unit is provided with an electric motor having a wet-running rotor.
  • the rotor space is flooded with a liquid and the rotor, i. in particular the rotor core, surrounded by a liquid and in accordance with liquid flows around in operation.
  • the pump unit thus forms a wet-running pump, which can be used in particular as a heating circulation pump.
  • FIG. 1 shows a stator 2 of an electric motor in the embodiment of a conventional EC motor in its front view.
  • the electric motor drives Centrifugal pump unit. It comprises a laminated core consisting of a yoke ring 6 and six stator poles 7 attached thereto, which in turn each consist of a pole leg 7a and a pole piece 7b.
  • the pole leg 7a is here attached by way of example via a dovetail connection 7c to the return ring 6.
  • the pole legs 7 a each carry a winding 5, so that the electric motor has a total of six stator windings 5.
  • Each winding 5 is wound on a winding support, which is supported by means of a rib-like structure on the back of the respective pole piece 7b.
  • the pole pieces 7b each have a concave inner surface which, due to the axial extent of the pole pieces 7b, substantially corresponds to a cylindrical portion. Together, the pole pieces 7b define with their inner surface a central opening 11, in which the rotor, not shown, of the electric motor is arranged.
  • FIG. 4a A representation of the stator 2 in cross section without windings 5 is in FIG. 4a shown, here the view opposite FIG. 1 from behind.
  • FIG. 4b An enlargement of a section of this illustration, which comprises the upper stator pole 7 in cross-section, is shown in FIG. 4b displayed.
  • FIG. 4b It can be seen that the profile of the inner surface of the pole pieces 7b of a circular section of a pure base circle 12, the in FIG. 4b is shown as a dotted line, differs in that it rises from one lateral end 4a in the circumferential direction to the other lateral end 4b and thus forms a circular wedge 4.
  • each pole piece 7b ie each stator pole 7 is provided with a circular wedge 4.
  • the circular wedges 4 rise in the cross-sectional profile of the pole pieces 7b radially inwardly into the opening 11 into it.
  • FIG. 2 shows the rear view of a split pot, ie a closed end gap tube 1.
  • the split tube 1 is thus closed at one axial end by a bottom 9.
  • a molded-on flange 8 extends substantially radially outwardly. This covers the directed to the pump unit, not shown, end face of the stator 2.
  • the outer peripheral surface of the can 1 has in cross section a deviating from the pure circular circular wedge profile with six circular wedges 3, which rise opposite the circular wedges 4 on the stator 2 in the opposite circumferential direction radially outward.
  • the circular spline 4 on the stator and the circular spline 3 on the split tube 1 thus form complementary circular wedge profiles.
  • the circular spline 4 Since the circular spline 4 is located radially on the stator 2 opposite the circular spline 3 on the gap tube 1, it is referred to as “outer circular spline" in the context of the invention. Accordingly, the circular spline 3 forms the gap tube 1, an "inner circular spline". However, these designations only relate to one another within their position within the pump unit and do not provide any information about the shape of the circular spline profiles.
  • FIG. 2 is a view from the rear of the can 1, while FIG. 1 a representation of the stator 2 from the front shows.
  • the complementary property is clear when the back of the can 1 is inserted from the front into the opening 11 of the stator 2. This is in FIG. 3 shown.
  • FIG. 3 shows an isometric exploded view of canned tube 1 and stator 2. They are part of a centrifugal pump assembly, in particular a heating circulation pump, which or a pump unit and an electric motor which drives the pump unit in a known manner.
  • the stator 2 and the can 1 are part of the electric motor, which also includes a rotor rotating in a rotor chamber 10. The stator 2 is separated from this rotor chamber 10 through the can 1.
  • the can 1 with clearance between the circular wedge contours 3, 4 is inserted axially into the opening 11 of the stator 2. Subsequently, the split tube 1 -in relation to FIG. 3 - Turned relative to the stator 2 counterclockwise, and / or the stator 2 in the clockwise direction relative to the can 1, so that the game disappears and the circular wedges 3 can 1 flat surface with the corresponding circular wedges 4 of the pole pieces 7 come to rest flat.
  • a circular wedge connection 3, 4 by means of which the can 1 is supported on the stator 2 between the can 1 and the stator 2.
  • the rotation must be done here only by a few degrees, since no forces in particular no torques between the can 1 and the stator 2 are transmitted. Essentially, in this case, only the large contact surface achievable by the circular wedge contour, with which the can 1 can be supported on the stator 2, in particular on the pole shoes 7b, so that the strength and stability of the can 1 against high internal pressures in the rotor chamber 10 is ensured. The internal pressure resistance of the can 1 is thereby significantly increased compared to a non-supported variant.
  • Tolerance fluctuations are thereby safely compensated in a simple way, so that the requirements for the component tolerances can be reduced. Furthermore, with the same requirements, the wall thickness of the can 1 can be reduced, so that the magnetic gap between the stator 2 and rotor is reduced and the magnetic material can be reduced.
  • the can 1 is made of plastic as an injection molded part in the embodiment shown. It has a wall thickness between 0.8 and 1.2mm.
  • the circular spline 3 on the can 1 has a profile height of about 0.1 mm.
  • the figures show only an exemplary variant of the invention.
  • the circular wedges 4 may extend to the pole pieces 7 in the other circumferential direction. The same then applies correspondingly to the complementary circular wedges 3 on the can 1.
  • fewer or more circular wedges 3, 4 are designed as pole shoes 7b, ie as stator poles 7 on the stator 2. It can For example, some stator poles 7 have no circular spline and accordingly not be involved in the support of the can 1. Alternatively, all stator poles 7 may have a circular wedge partial profile and in each case participate proportionally in the formation of a common circular wedge.
  • a stator pole 7 is involved in the formation of more than one circular wedge or even forms two or more circular wedges.
  • the split tube 1 has in the said variants then on its outer circumference circular wedges, which form a correspondingly complementary circular wedge profile.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Motor Or Generator Frames (AREA)

Claims (9)

  1. Groupe de pompage comprenant une unité à pompe et un moteur électrique qui entraîne celle-ci, celui-ci comprenant un stator (2) et un rotor qui tourne dans un espace de rotor (10), le stator (2) étant séparé de l'espace de rotor (10) par une gaine de moteur (1), caractérisé en ce qu'entre la gaine de moteur (1) et le stator (2) il existe une liaison par clavette circulaire (3, 4) au moyen de laquelle la gaine de moteur (1) s'appuie sur le stator (2).
  2. Groupe de pompage selon la revendication 1, caractérisé en ce que la gaine de moteur (1) possède une surface périphérique extérieure qui possède, dans le sens périphérique, au moins un profil de clavette circulaire interne (3) différent de la forme de clavette.
  3. Groupe de pompage selon la revendication 2, caractérisé en ce que le stator (2) possède un bloc de stator muni d'une ouverture centrale (11) dans laquelle repose le rotor, une surface intérieure qui délimite l'ouverture (11) dans le sens périphérique possédant au moins un profil de clavette circulaire externe (4) complémentaire au profil de clavette circulaire interne (3) et différent de la forme de clavette (12).
  4. Groupe de pompage selon la revendication 2 ou 3, caractérisé en ce que le stator (2) possède plusieurs épanouissements polaires (7b) qui s'étendent radialement vers l'intérieur, chacun possédant une surface périphérique intérieure, parmi lesquels au moins deux épanouissements polaires (7) possèdent dans le sens périphérique un profil de clavette circulaire externe (4) complémentaire au profil de clavette circulaire interne (3) et différent de la forme de clavette (12).
  5. Groupe de pompage selon la revendication 4, caractérisé en ce que tous les épanouissements polaires (7b) possèdent dans le sens périphérique un profil de clavette circulaire externe (4) différent de la forme de clavette (12) et sur lequel s'appuie la gaine de moteur (1).
  6. Groupe de pompage selon l'une des revendications 3 à 5, caractérisé en ce que le profil de clavette circulaire externe est formé par une clavette circulaire (4) ou plusieurs clavettes circulaires (4), chaque épanouissement polaire (7b) ne possédant sur sa surface périphérique interne qu'une portion partielle de la clavette circulaire (4) ou de l'une des clavettes circulaires (4).
  7. Groupe de pompage selon l'une des revendications 3 à 6, caractérisé en ce que le profil de clavette circulaire externe est formé par une pluralité de clavettes circulaires (4), chaque épanouissement polaire (7b) possédant une clavette circulaire propre (4) sur sa surface périphérique interne.
  8. Groupe de pompage selon l'une des revendications précédentes, caractérisé en ce que le profil de clavette circulaire interne (3) possède une hauteur de profil de 1/20 à 1/5, de préférence de 1/10 de l'épaisseur de paroi de la gaine de moteur (1).
  9. Groupe de pompage selon l'une des revendications précédentes, caractérisé en ce que la gaine de moteur (1) possède sur son pourtour extérieur une partie en saillie radiale qui, en l'état introduit et serré de la gaine de moteur (1), vient en prise par l'arrière avec le stator (2), notamment un épanouissement polaire (7b) du stator (2).
EP14000461.5A 2013-03-14 2014-02-10 Groupe motopompe Active EP2778424B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310004336 DE102013004336A1 (de) 2013-03-14 2013-03-14 Pumpenaggregat

Publications (3)

Publication Number Publication Date
EP2778424A2 EP2778424A2 (fr) 2014-09-17
EP2778424A3 EP2778424A3 (fr) 2015-01-21
EP2778424B1 true EP2778424B1 (fr) 2016-06-22

Family

ID=50072841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14000461.5A Active EP2778424B1 (fr) 2013-03-14 2014-02-10 Groupe motopompe

Country Status (2)

Country Link
EP (1) EP2778424B1 (fr)
DE (1) DE102013004336A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2101672A1 (de) * 1971-01-15 1972-07-20 Licentia Gmbh Heizungswasser-Umwälzpumpe
DE2258128A1 (de) * 1972-11-28 1974-05-30 Hermetic Pumpen Gmbh Spaltrohrmotor, insbesondere fuer hochdruckpumpen
DE4327461A1 (de) * 1993-04-24 1994-10-27 Prym Werke William Vorrichtung zum Sichern der Stecklage zwischen einem Kernteil und einem Hüllteil, wie zwischen einem Gewindeschaft und seiner Schraubenmutter
JPH09280190A (ja) * 1996-04-16 1997-10-28 Ebara Corp キャンドモータ
DE10028011A1 (de) * 2000-06-06 2001-08-30 Daimler Chrysler Ag Welle-Nabe-Verbindung
DE102007037581A1 (de) * 2006-08-16 2008-02-21 Andreas Stihl Ag & Co. Kg Verbrennungsmotor mit einem Wechselstromgenerator
ES2402667T5 (es) * 2008-04-19 2016-06-28 Grundfos Management A/S Componente de carcasa de estator para un motor encapsulado hermético
DE102008047017A1 (de) * 2008-09-13 2010-03-18 Schaeffler Kg Kreiskeil-Verbindung
DE102010011316A1 (de) * 2010-03-13 2011-09-15 Ksb Aktiengesellschaft Spaltrohrmotor mit Spaltrohrabstützung
DE102011014088A1 (de) * 2011-03-16 2012-09-20 Wilo Se Verfahren zum Montieren eines Spalttopfes einer Motorpumpe

Also Published As

Publication number Publication date
EP2778424A2 (fr) 2014-09-17
EP2778424A3 (fr) 2015-01-21
DE102013004336A1 (de) 2014-09-18

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