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EP2786021B1 - Motopompe de compteur hydraulique - Google Patents

Motopompe de compteur hydraulique Download PDF

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Publication number
EP2786021B1
EP2786021B1 EP12818777.0A EP12818777A EP2786021B1 EP 2786021 B1 EP2786021 B1 EP 2786021B1 EP 12818777 A EP12818777 A EP 12818777A EP 2786021 B1 EP2786021 B1 EP 2786021B1
Authority
EP
European Patent Office
Prior art keywords
impeller
motor
pump
motor shaft
wall
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.)
Revoked
Application number
EP12818777.0A
Other languages
German (de)
English (en)
Other versions
EP2786021A2 (fr
Inventor
Günter Strelow
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=47603521&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2786021(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wilo SE filed Critical Wilo SE
Publication of EP2786021A2 publication Critical patent/EP2786021A2/fr
Application granted granted Critical
Publication of EP2786021B1 publication Critical patent/EP2786021B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D13/0613—Special connection between the rotor compartments
    • 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/60—Shafts
    • F05D2240/61—Hollow

Definitions

  • the invention relates to a wet-running motor pump with a canned tube that separates the motor stator from the motor shaft, which is mounted in the canned tube and carries a rotor package, which projects into the pump chamber and carries the pump impeller there, with a partition wall separating the canned interior from the pump chamber there is a coaxial annular space on the rear side of the impeller, and through at least one flow passage located in the dividing wall, the conveying liquid flows into the rotor space surrounded by the can, in order to flow back into the pump chamber after flowing through the rotor space, in particular through the longitudinal cavity of the motor shaft.
  • Standard heating circulation pumps are made up of the following main components: drive motor, pump housing and impeller.
  • the motor is usually an electric motor in a wet-running version.
  • the impeller is often a radial rotor and transmits the power of the motor to the medium.
  • the stator is separated from the medium by a can / pot.
  • the bearings of the rotor are lubricated by the medium.
  • Such constructions are maintenance-free and have a very long service life as long as the medium is relatively clean.
  • the rotor of the motor is designed with a shaft bore.
  • the media are contaminated with particles and chemical agents (inhibitors). This makes it necessary to limit the flow in the rotor space to what is necessary for the motor to function (bearing lubrication, cooling). In addition, it is necessary to prevent abrasive particles from entering the rotor space.
  • the object of the invention is to limit the flow through the rotor space to a very small value, additionally to keep it essentially independent of the operating point and to let as few particles as possible get into the rotor space.
  • the pressure in the annular space behind the impeller is kept almost the same regardless of the operating point of the pump, so that the flow through the rotor space is low and essentially uniform.
  • the flow in the rotor chamber is thus limited to the required extent, so that particles and chemical agents contained in the medium only reach the rotor chamber to a minimal extent.
  • the pressure difference between the inlet and the outlet from the rotor chamber is therefore very small and is kept constant.
  • the coaxial annular projection has the shape of a cylinder liner which is molded onto the rear of the impeller.
  • the can interior can also be closed off by a partition in the form of a flange-shaped annular sheet metal part which lies between the can flange and the sealing ring.
  • a filter plug be located in the longitudinal cavity of the motor hollow shaft near the impeller.
  • the filter plug lies in front of the throttled opening (s) in the flow direction of the hollow shaft flow. It is also advantageous if the hollow motor shaft is closed in the flow direction behind the throttled opening (s), so that there is only a connection between the openings of the hollow motor shaft.
  • the impeller have a rear support disc on which the impeller blades are arranged, permanent magnets being attached to the back of the support disc, for trapping particles contained in the conveyed liquid, the support disc being made of plastic that the magnets inside the Plastic of the support plate arranged and that the magnet side, which faces the delivery flow located on the back of the carrier disk, is covered by a layer of material.
  • the material layer covering the magnets ensures that the magnetizable particles do not adhere to the magnets of the impeller, but are conveyed into the pump chamber by the centrifugal forces acting on the back of the impeller and thus conveyed to the pump outlet.
  • the magnets thus have a redirecting effect on the magnetizable particles, ensuring that they do not stick to the magnets and thus do not impair the efficiency of the impeller.
  • a throttled opening being shown both in the rear wall of the impeller and in the wall of the hollow shaft, and the throttled opening only in the impeller or can only be arranged in the hollow shaft, or as a third embodiment in both.
  • only one throttled opening in the impeller and in the hollow shaft is shown in the drawing. However, several of these can also be provided in the respective part.
  • the wet-running motor pump has an impeller 1 which is driven by a coaxial hollow shaft 2 which carries a rotor package 3 which rotates within the stator 4 of the electric motor.
  • the rotor assembly 3 is separated from the stator by a can 5 through which the conveyed medium flows, so that the bearings 6, 7 located in the can 5 are lubricated and cooled.
  • the can is closed on the back, so that one can also speak of a "can".
  • the can 5 forms a can flange 8 on the end facing the impeller, against which an annular partition 9 in the form of a sheet metal part rests in order to separate the pump chamber 10 from the inside of the can 5. At least one throughflow opening is located in the partition 9 so that the conveyed medium enters the interior of the can 5.
  • annular projection 11 On the back of the pump impeller 1, an annular projection 11 is formed coaxially, so that an annular space 12 is formed within this projection, which is separated from the rest of the pump chamber 10 except for a throttle gap 13.
  • This throttle gap 13 is formed between the front end of the annular projection 11 and the partition 9 and / or between the annular projection 11 and a sealing coaxial sealing ring 14 which surrounds the hollow shaft 2 and abuts the partition 9.
  • the medium flowing from the annular space 12 through the dividing wall 9 into the interior of the canned tube first flows past the inner wall of the canned tube 5 to the end of the canned tube, in order to get there through openings 17 into the longitudinal cavity 18 of the hollow shaft 2.
  • the annular projection 11 essentially has the shape of a cylinder liner which is molded onto the rear of the impeller. Due to the dimensions of the annular projection 11 and in particular also that of the sealing ring 14, the size of the throttle gap 13, which is essentially ring-shaped, can be determined very precisely, and thus how much delivery medium flows from the annular space 12 into the interior of the can 5.
  • the liquid pressure within the annular space 12 is reduced in that at least one throttled opening 15 is arranged in the rear wall of the impeller 1 and / or at least one throttled opening 16 is arranged in the wall of the hollow shaft 2, through which liquid located in the annular space 12 to the suction side of the pump flows.
  • the liquid pressure in the annular space 12 is thus considerably lower than the pressure on the pressure side of the pump and higher than the pressure on the suction side of the pump.
  • the pressure and flow in the annular space 12 are relatively constant, so that the pressure and flow in the interior of the can are kept essentially independent of the operating point of the pump.
  • valve plug 19 At the front end of the longitudinal cavity 18 of the hollow shaft 2 there is a valve plug 19.
  • this plug When the throttled opening 16 is arranged in the hollow shaft wall, this plug is offset further inwards, as shown in dashed lines, so that when the opening 16 is arranged, the filter plug 19 in the flow direction of the hollow shaft flow lies in front of the throttled opening 16.
  • Particles easily accumulate in the space between the pump wall and the impeller rear, which can get into the rotor space and the bearings of the shaft and accelerate wear.
  • permanent magnets covered by a preferably non-magnetic material layer, in particular a plastic layer are fixed in the back of the supporting disk of the impeller and act on the liquid in the intermediate space. As a result, particles of magnetizable metal in the liquid are attracted to the magnet without sticking to the permanent magnet.
  • the magnetic force acting on the particles causes the particles striving through the wheel side space flow to the center (shaft) to be deflected by these magnets on the impeller rear side to the impeller rear wall and are pushed back into the pump chamber by the centrifugal force acting here, without the motor rotor space inside the Reaching the can or can and without getting into the bearings.
  • the magnets can be designed differently, e.g. as a ring, individual magnets or segments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (7)

  1. Circulateur motorisé à rotor noyé avec une gaine (5), séparant le stator du moteur (4) de l'arbre du moteur (2) portant un paquet rotor (3) et monté dans la gaine, lequel arbre du moteur avance à l'intérieur de la chambre du circulateur (10) où il porte le rotor du circulateur (1), sachant qu'un espace annulaire coaxial (12) est formé entre une paroi de séparation (9) isolant l'espace intérieur de la gaine de la chambre du circulateur (10) et la face arrière du rotor, et que du fait d'au moins un passage d'écoulement de la paroi de séparation (9), le liquide transporté s'écoule dans l'espace du rotor entouré de la gaine (5) pour, après avoir traversé l'espace du rotor, en particulier au travers de la cavité longitudinale (18) de l'arbre du moteur (2), retourner dans la chambre du circulateur(10), caractérisé en ce que,
    - la face arrière du rotor du circulateur (1) présente une protubérance annulaire coaxiale (11) séparant l'espace annulaire (12) côté arrière entourant l'arbre du moteur (2) du reste de la chambre du circulateur jusqu'à au moins une fente d'étranglement (13) franchissant la protubérance annulaire (11) et au travers de laquelle le liquide transporté du côté arrière du circulateur s'écoule de façon réduite dans l'espace annulaire (12) et
    - l'espace annulaire (12) est connecté au côté aspiration du circulateur au travers d'au moins une ouverture étranglée (15, 16) dans la paroi arrière du rotor et/ou dans la paroi de l'arbre creux du moteur (2),
    - l'espace annulaire (12) est, du côté faisant face à l'espace intérieur de la gaine, limité par un anneau d'étanchéité (14) dont la paroi extérieure crée, avec la face intérieure de la protubérance annulaire (11), la fente d'étranglement (13).
  2. Circulateur motorisé selon la revendication 1, caractérisé en ce que la protubérance annulaire coaxiale (11) a la forme d'une chemise de cylindre formée sur la face arrière du rotor.
  3. Circulateur motorisé selon les revendications 1 ou 2, caractérisé en ce que l'espace intérieur de la gaine est fermé par une paroi de séparation (9) composée d'un morceau de tôle annulaire en forme de bride placée entre la bride de la gaine et l'anneau d'étanchéité (14).
  4. Circulateur motorisé selon l'une des revendications précédentes, caractérisé en ce qu'une crépine (19) est placée à proximité du rotor (1) dans la cavité longitudinale (18) de l'arbre creux du moteur (2).
  5. Circulateur motorisé selon la revendication 4, caractérisé en ce que, pour une disposition de la ou des ouvertures étranglées (16) dans la paroi de l'arbre creux du moteur (2), la crépine (19) est placée dans le sens de l'écoulement de l'arbre creux avant la ou les ouvertures étranglées (16).
  6. Circulateur motorisé selon l'une des revendications précédentes, caractérisé en ce que l'arbre creux du moteur (2) dans le sens de l'écoulement est fermé derrière la ou les ouvertures étranglées (16), ce qui fait qu'il n'existe qu'une liaison entre les ouvertures (16 et 17) de l'arbre creux du moteur.
  7. Circulateur motorisé selon l'une des revendications précédentes, caractérisé en ce que le rotor (1) présente un disque porteur côté arrière, sur lequel sont disposées les lames du rotor, sachant que sur la face arrière du disque porteur sont fixés des aimants permanents destinés à capter les particules contenues dans le liquide transporté, sachant que le disque porteur est en plastique, que les aimants sont inclus dans le plastique du disque porteur et que le côté aimant, orienté du côté du liquide transporté s'écoulant du côté arrière du disque, est recouvert d'une couche de matériau.
EP12818777.0A 2011-11-29 2012-11-23 Motopompe de compteur hydraulique Revoked EP2786021B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011119626A DE102011119626A1 (de) 2011-11-29 2011-11-29 Nassläufer-Motorpumpe
PCT/EP2012/004852 WO2013079179A2 (fr) 2011-11-29 2012-11-23 Motopompe de compteur hydraulique

Publications (2)

Publication Number Publication Date
EP2786021A2 EP2786021A2 (fr) 2014-10-08
EP2786021B1 true EP2786021B1 (fr) 2020-02-12

Family

ID=47603521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12818777.0A Revoked EP2786021B1 (fr) 2011-11-29 2012-11-23 Motopompe de compteur hydraulique

Country Status (4)

Country Link
EP (1) EP2786021B1 (fr)
CN (1) CN103998787B (fr)
DE (1) DE102011119626A1 (fr)
WO (1) WO2013079179A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3017907B1 (fr) * 2014-02-26 2019-01-25 Wilo Salmson France Pompe de circulation de fluide comportant deux sous-ensembles dont l'un est amovible par rapport a l'autre
SI3425221T1 (sl) * 2017-07-06 2020-04-30 Grundfos Holding A/S Držalo ležaja črpalke

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528698A1 (de) 1964-09-03 1970-04-09 Crane Co Pumpe mit Motorantrieb
DE3232473A1 (de) 1982-09-01 1984-03-01 Reinecker Heyko Dipl Ing Fh Kreiselpumpe mit spaltrohr-magnetkupplung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280750A (en) * 1964-09-17 1966-10-25 Crane Co Motor driven pump
JPS51111902A (en) * 1975-03-26 1976-10-02 Iwaki:Kk Magnet pump
DE3645260C2 (de) * 1986-11-20 1995-01-19 Hermetic Pumpen Gmbh Pumpe mit einem Spaltrohrmagnetkupplungsantrieb
DE8708334U1 (de) * 1987-06-12 1987-07-30 Dickow-Pumpen KG, 8264 Waldkraiburg Kreiselpumpe
US5248245A (en) * 1992-11-02 1993-09-28 Ingersoll-Dresser Pump Company Magnetically coupled centrifugal pump with improved casting and lubrication
GB2290113B (en) * 1994-05-31 1998-07-15 Ingersoll Dresser Pump Co Centrifugal pump
DE29610799U1 (de) * 1996-06-20 1997-02-27 Klaus Union Armaturen Hydrodynamisches Gleitlager für einen Läufer einer Pumpe
DE10240800B4 (de) * 2002-08-30 2005-03-24 Munsch Chemie-Pumpen Gmbh Pumpe für chemisch aggressive Fördermedien
DE10322464B4 (de) 2003-05-16 2012-05-03 Ksb Ag Spaltrohrmotorpumpe
DE102004019721A1 (de) * 2004-03-18 2005-10-06 Medos Medizintechnik Ag Pumpe
CN201209565Y (zh) * 2008-05-29 2009-03-18 杭州大路实业有限公司 防颗粒磨损的磁力泵
CN201297259Y (zh) * 2008-12-01 2009-08-26 张良光 一种高温高压磁力泵

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528698A1 (de) 1964-09-03 1970-04-09 Crane Co Pumpe mit Motorantrieb
DE3232473A1 (de) 1982-09-01 1984-03-01 Reinecker Heyko Dipl Ing Fh Kreiselpumpe mit spaltrohr-magnetkupplung

Also Published As

Publication number Publication date
EP2786021A2 (fr) 2014-10-08
CN103998787B (zh) 2017-11-17
WO2013079179A4 (fr) 2014-02-13
DE102011119626A1 (de) 2013-05-29
WO2013079179A3 (fr) 2013-12-27
CN103998787A (zh) 2014-08-20
WO2013079179A2 (fr) 2013-06-06

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