EP2322803B1 - Pompe dotée d un embrayage magnétique - Google Patents

Pompe dotée d un embrayage magnétique Download PDF

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Publication number
EP2322803B1
EP2322803B1 EP10190314.4A EP10190314A EP2322803B1 EP 2322803 B1 EP2322803 B1 EP 2322803B1 EP 10190314 A EP10190314 A EP 10190314A EP 2322803 B1 EP2322803 B1 EP 2322803B1
Authority
EP
European Patent Office
Prior art keywords
fluid
rotor
pump
cover
containment
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
EP10190314.4A
Other languages
German (de)
English (en)
Other versions
EP2322803A2 (fr
EP2322803A3 (fr
Inventor
Frank Holz
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.)
Leistritz Pumpen GmbH
Original Assignee
Leistritz Pumpen GmbH
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
Application filed by Leistritz Pumpen GmbH filed Critical Leistritz Pumpen GmbH
Publication of EP2322803A2 publication Critical patent/EP2322803A2/fr
Publication of EP2322803A3 publication Critical patent/EP2322803A3/fr
Application granted granted Critical
Publication of EP2322803B1 publication Critical patent/EP2322803B1/fr
Active 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0069—Magnetic couplings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/027—Details of the magnetic circuit
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine

Definitions

  • the invention relates to a pump with a magnetic coupling, comprising a rotor shaft rotatably mounted in a pump housing, which carries an impeller or a spindle for conveying a fluid from a suction chamber into a pressure chamber as well as a rotor with an internal magnet arranged in a can through which the fluid flows. which can be set in rotation via the magnetic field of an external magnet.
  • a generic pump is from the patent US 5 165 868 discloses the features of the preamble of claim 1 and is considered the closest prior art.
  • Figure 1 shows a conventional pump with a magnetic coupling, a rotor shaft 2 rotatably mounted in a pump housing 1, which has an impeller or a spindle 3 for conveying a fluid from a suction chamber 4 into a pressure chamber 5.
  • the rotor shaft 2 carries a rotor 6, which is arranged in a containment shell 7, through which the fluid flows.
  • the rotor 6 has an inner magnet 8, which is in through the magnetic field Figure 1 External magnet, not shown, can be set in rotation.
  • a leakage flow is required, which is driven by the pressure difference between the suction side and the pressure side of the pump.
  • the leakage flow which is absolutely necessary for cooling the magnetic coupling, is branched off from the pumped medium by guiding it from the pressure chamber 5 in the pump housing 1 through a gap 9 between a throttle piston formed as a component of the rotor shaft 2 and a cover 10 axially closing the pump housing 1.
  • the fluid After flowing through the gap 9, the fluid passes into the can 7, between the cover 10 and the rotor 6 of the magnetic coupling, further through a narrow gap 11 between the inside of the can 7 and the rotor 6. From there, the fluid passes through a longitudinal bore 12 of the rotor shaft 2 back into the suction chamber 4 in the pump housing 1.
  • This flow guidance results in a not negligible force in the axial direction, which acts on the rotating components and must be absorbed by appropriately solid bearings.
  • the invention is therefore based on the object of specifying a pump with a magnetic coupling in which the axial force acting on the rotor shaft is reduced.
  • the suction chamber and the containment shell are connected to one another via a line through which the fluid can flow.
  • the line provided according to the invention which connects the containment shell to the suction chamber, prevents an appreciable axial force from acting on the rotor shaft.
  • the manufacture of the pump according to the invention is facilitated since the rotor shaft can be manufactured without a longitudinal bore. Instead, the fluid flows back through the line which connects the suction chamber to the containment shell and which can be arranged inside or outside the pump housing.
  • the line leading to the containment shell opens into a cover arranged between the pump housing and the containment shell.
  • the cover is thus located between the pump housing and the containment shell, the line connecting the suction space and the containment shell can be at least partially guided in the cover.
  • the cover arranged between the pressure chamber and the containment shell preferably has an opening which can be designed as a diaphragm. Due to the higher pressure in the pressure chamber compared to the containment shell, in which the pressure of the pressure chamber essentially prevails, a fluid flow is generated from the pressure chamber into the containment shell, which cools the magnetic coupling in the containment shell and in particular its rotor.
  • the opening in the lid opens into a gap between the outside of the rotor and the inside of the containment shell.
  • the outside of the rotor is practically completely flowed around by the fluid, as a result of which the heat generated during operation of the magnetic coupling is dissipated.
  • the size and the shape of the gap are selected such that the fluid essentially exerts pressure upon flowing through the gap is relaxed in the suction chamber.
  • the rotor of the pump according to the invention has a plurality of openings which are distributed in the circumferential direction and through which the fluid can flow. After flowing through the openings, the fluid returns to the suction space through the line.
  • a sealing gap is formed between the cover and the rotor. This sealing gap prevents a significant amount of the fluid from flowing directly into the area of the rotor shaft from the opening, instead the fluid is guided past the outside of the rotor, so that the desired cooling effect of the magnetic coupling is achieved.
  • the pump according to the invention can in particular be designed as a screw pump.
  • the pump 13 shown essentially consists of a pump housing 14 in which a rotor shaft 15 is rotatably mounted.
  • the rotor shaft 15 carries an impeller or a spindle 16, which with a in Fig. 2 not shown second, counter-rotating spindle combs, the spindles being formed with a spindle profile, so that during the rotation delivery spaces for a fluid are formed, whereby the fluid is axially conveyed.
  • On the in Fig. 2 On the left side is the suction chamber 17, which is connected to an inlet, not shown, for the fluid, at the other end of the spindle 16 is the pressure chamber 18, which is connected to an outlet, not shown, for the fluid.
  • a cover 19 is placed on the pump housing 14, which is open on one side.
  • a can 20 is attached to the cover 19 and receives a magnetic coupling.
  • the magnetic coupling comprises a rotor 21 which is fixedly connected to the rotor shaft 15.
  • the rotor 21 On its outside, the rotor 21 has an inner magnet 22 which consists of a A plurality of individual magnets exist.
  • the rotor 21 can be set in rotation by a magnetic rotary field generated outside the containment shell 20, so that it sets the intermeshing profile packages of the spindles 16 in rotation via the rotor shaft 15, whereby the fluid is conveyed from the suction chamber 17 into the pressure chamber 18.
  • the cover 19 has an opening 23 in the form of an aperture, which passes through the cover 19 and is connected on the one hand to the pressure chamber 18 and on the other hand to a gap 24 which is formed between the inside of the can 20 and the outside of the rotor 21.
  • the opening 23 causes part of the fluid from the pressure chamber 18 to flow through the opening 23 and the gap 24 past the outside of the rotor 21, as a result of which it is cooled.
  • the flowing fluid dissipates the heat generated by the external rotating field acting on the rotor 21.
  • the rotor 21 After the fluid has flowed around the rotor 21, it has been approximately released to the pressure prevailing in the suction space 17.
  • the rotor 21 has a plurality of openings 25 arranged distributed in the circumferential direction, so that the rotor 21 has the fluid flowing around it on practically all sides and is cooled in this way.
  • a circumferential sealing gap 26 is formed between the stationary cover 19 and the rotatable rotor 21, which ensures that the fluid flows into the can 20 via the outside of the rotor 21.
  • the rotor shaft 15 in the area of the cover 19 has a shoulder 27 with an enlarged diameter, so that the rotor shaft 15 acts as a throttle piston at this point.
  • Part of the fluid also flows into the can 20 between the shoulder 27 and a circular opening 28 in the cover 19.
  • the fluid flows out via a line 29, which is connected on the one hand to the interior of the can 20 and on the other hand to the suction chamber 17 the can 20 back into the suction chamber 17.
  • a section of the line 29 runs in the cover 19, another section runs outside the pump housing 14.
  • the line can be arranged completely outside the pump housing and open directly into the interior of the containment can without it being arranged inside the cover.
  • the line is arranged inside the pump housing.
  • the diameter of the line 29 is selected so that the comparatively large amount of the flowing fluid, which flows on the one hand via the opening 23 and on the other hand via the opening 28 into the can 20, can be removed.
  • the opening 23 is designed as an orifice whose opening diameter can be set differently depending on the pressure difference of the pump 13.
  • the pump shown has the advantage that there is no or only a slight axial force which acts on the rotor shaft 15. An axial force that may occur is only dependent on the pressure losses in the openings of the magnetic coupling and the external or internal line 29 that leads into the suction space 17.
  • Another advantage can be seen in the fact that the amount of the fluid serving as the cooling flow is independent of the leakage through the gap at the shoulder 27 of the rotor shaft 15 acting as a throttle piston, since the partial flows of the fluid for the cooling and the leakage are separated from one another. Since the rotor shaft 15 does not require a longitudinal bore, it can be manufactured more easily in comparison to through-drilled rotor shafts.

Claims (6)

  1. Pompe (13) dotée d'un embrayage magnétique, comprenant un arbre de rotor (15) supporté à rotation dans un boîtier de pompe (14), qui supporte une roue mobile ou une broche (16) pour refouler un fluide depuis un espace d'aspiration (17) dans un espace de pression (18), ainsi qu'un rotor (21) disposé dans un pot fendu (20) parcouru par le fluide, avec un aimant intérieur qui peut être mis en rotation par le biais du champ magnétique d'un aimant extérieur, l'espace d'aspiration (17) et le pot fendu (20) étant connectés l'un à l'autre par le biais d'une conduite (29) pouvant être parcourue par le fluide, un couvercle (19) présentant une ouverture (23) étant disposé entre l'espace de pression (18) et le pot fendu (20), caractérisée en ce qu'entre le couvercle (19) et le rotor (21) est réalisée une fente d'étanchéité (26) et l'ouverture (23) est connectée à une fente (24) qui est formée entre le côté intérieur du pot fendu (20) et le côté extérieur du rotor (21), l'arbre de rotor (15) présentant dans la région du couvercle (19) un épaulement (27) de plus grand diamètre de telle sorte que l'arbre de rotor (27) agisse à cet endroit en tant que piston d'étranglement, une ouverture de forme annulaire (28) étant réalisée entre le couvercle (19) et l'épaulement (27), les deux ouvertures (23, 28) permettant un écoulement de fluide depuis l'espace de pression (18) dans le pot fendu (20) et la conduite (29) permettant un reflux du fluide dans l'espace d'aspiration (17).
  2. Pompe selon la revendication 1, caractérisée en ce que la conduite (29) reliant l'espace d'aspiration (17) et le pot fendu (20) débouche dans le couvercle (19) disposé entre le boîtier de pompe (14) et le pot fendu (20).
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce que l'ouverture (23) prévue dans le couvercle (19) présente un diaphragme.
  4. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que la taille et la forme de la fente (24) sont choisies de telle sorte que le fluide soit essentiellement détendu à la pression dans l'espace d'aspiration (17) après son passage à travers la fente (24).
  5. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le rotor (21) présente plusieurs ouvertures (25) pouvant être parcourues par le fluide, disposées de manière répartie dans la direction périphérique.
  6. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle est réalisée sous forme de pompe à broche hélicoïdale.
EP10190314.4A 2009-11-11 2010-11-08 Pompe dotée d un embrayage magnétique Active EP2322803B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009052856A DE102009052856B3 (de) 2009-11-11 2009-11-11 Pumpe mit einer Magnetkupplung

Publications (3)

Publication Number Publication Date
EP2322803A2 EP2322803A2 (fr) 2011-05-18
EP2322803A3 EP2322803A3 (fr) 2014-09-03
EP2322803B1 true EP2322803B1 (fr) 2020-05-06

Family

ID=42538772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10190314.4A Active EP2322803B1 (fr) 2009-11-11 2010-11-08 Pompe dotée d un embrayage magnétique

Country Status (3)

Country Link
EP (1) EP2322803B1 (fr)
DE (1) DE102009052856B3 (fr)
ES (1) ES2796658T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013206141A1 (de) 2013-04-08 2014-10-09 Schaeffler Technologies Gmbh & Co. Kg Mediengeschmiertes Wälzlager
DE102016120579B3 (de) * 2016-10-27 2018-04-05 Klaus Union Gmbh & Co. Kg Horizontal geteilte Schraubenspindelpumpe
EP3567333A1 (fr) * 2018-05-09 2019-11-13 Linde Aktiengesellschaft Dispositif d'entraînement pour un dispositif de nettoyage pour un échangeur thermique
DE102018113950A1 (de) 2018-06-12 2019-12-12 Geomar Helmholtz-Zentrum Für Ozeanforschung Kiel Vorrichtung zur berührungslosen Übertragung von Drehbewegungen
DE102021133106A1 (de) * 2021-12-14 2023-06-15 Leistritz Pumpen Gmbh Schraubenspindelpumpe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8906020U1 (fr) * 1989-05-13 1989-06-29 Rheinhuette Gmbh & Co., 6200 Wiesbaden, De
US5165868A (en) * 1991-04-29 1992-11-24 Tuthill Corporation Magnetically driven pump
JP3346698B2 (ja) * 1996-03-18 2002-11-18 株式会社荏原製作所 高温用モータポンプとその運転方法
US5763973A (en) * 1996-10-30 1998-06-09 Imo Industries, Inc. Composite barrier can for a magnetic coupling
DE10024953A1 (de) * 2000-05-22 2001-11-29 Richter Chemie Tech Itt Gmbh Kreiselpumpe mit Magnetkupplung
US20040105768A1 (en) * 2002-11-27 2004-06-03 Cameron Donald B. Internal recirculation for magnetically coupled positive displacement pumps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2322803A2 (fr) 2011-05-18
DE102009052856B3 (de) 2010-09-09
ES2796658T3 (es) 2020-11-27
EP2322803A3 (fr) 2014-09-03

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