EP1023936B1 - Rührwerk mit magnetischem Antrieb und Verfahren zur Drehmomenteinstellung für die Kraftübertragung eines derartigen Rührwerks - Google Patents

Rührwerk mit magnetischem Antrieb und Verfahren zur Drehmomenteinstellung für die Kraftübertragung eines derartigen Rührwerks Download PDF

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Publication number
EP1023936B1
EP1023936B1 EP99420233A EP99420233A EP1023936B1 EP 1023936 B1 EP1023936 B1 EP 1023936B1 EP 99420233 A EP99420233 A EP 99420233A EP 99420233 A EP99420233 A EP 99420233A EP 1023936 B1 EP1023936 B1 EP 1023936B1
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EP
European Patent Office
Prior art keywords
rotor
axis
shaft
agitator
sleeve
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.)
Expired - Lifetime
Application number
EP99420233A
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English (en)
French (fr)
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EP1023936B2 (de
EP1023936A1 (de
Inventor
Philippe Eyraud
Guy Flavien
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Mixel
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Mixel
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Publication of EP1023936A1 publication Critical patent/EP1023936A1/de
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Publication of EP1023936B1 publication Critical patent/EP1023936B1/de
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
    • B01F33/4535Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements using a stud for supporting the stirring element

Definitions

  • the invention relates to a stirrer with magnetic drive and a method of adjusting the transmission limit torque of effort of such an agitator.
  • Agitators are conventionally used to brew a mixture inside a container in order to avoid a decantation or any other alteration of the mixture during the time.
  • a stirrer with magnetic drive has the advantage that the motion of the propeller he understands is performed by a magnetic coupling that takes place without contact physical between two rotating parts one of which is driven by the output shaft of an electric motor while the other is constituted by a helix. This allows to have the part associated with the electric motor shaft outside the container while the propeller is installed inside the container. Any danger of leakage in the agitator can so be dismissed. This is particularly useful when the mixture is toxic or when pollution of it by external agents should be avoided as, for example, in the case of a drug composition.
  • the magnetic coupling used for an industrial agitator must be intense in order to drive the agitator propeller with sufficient force.
  • it is necessary the process of dismantling the propeller in particular for reasons maintenance or inspection of the container in which formed the mixture (see for example EP 0437394). It is thus common to plan to clean the propeller of an agitator and / or sterilize it outside the container at the end of each production batch. He's sometimes necessary to disassemble the propeller to proceed with the exchange Standard wear parts such as bearings. when propeller has been dismantled, it must be put back in place with the greater precautions on its support avoiding the most clashes that could damage the blades, bearings and / or the surface of the container.
  • the magnetic forces necessary to train the propeller of an industrial agitator are such that the effort that must exercise an operator to remove the propeller is very important because this effort must overcome both the weight of the helix and the magnetic coupling force needed to training. This is even more critical when handing over in place of the propeller, as long as during the presentation of it, it happens that the magnetic effort is so intense that the propeller escapes the operator and comes to tackle violently against its support, which has the consequence damage to the bearings, or even to injure the operator.
  • the invention relates to a stirrer with magnetic drive that includes a flange fit to be mounted tightly in a wall of a container and provided with a blind sleeve inside which is housed a rotor supporting a first magnetic coupling means, then that a propeller arranged around this sleeve is equipped with a second magnetic coupling means for the training of this helix around an axis of rotation.
  • This agitator is characterized in that the rotor is movable in translation, parallel to this axis inside the sleeve, between a first position where the first and second coupling means are facing, so that they cooperate for the training in rotation of this propeller, and a second position where they do not interact or little, so that this propeller can be moved relative to the sleeve without interaction notable first and second coupling means.
  • the magnetic coupling between the magnets of the rotor and propeller is annihilated without this magnetic coupling strongly opposes the translation of the rotor.
  • it is sufficient to place it on the sleeve, then move the rotor translation inside the sleeve until the magnets that he wears be level or facing magnets worn by the propeller.
  • the invention thus makes it possible to set up the propeller without interference with the rotor magnets, then move it until it can drive the propeller, this displacement being carried out in a direction such that It is not necessary to overcome an intense magnetic effort.
  • the rotor is moved in rotation about its axis and in translation parallel of this axis, by a drive shaft itself mobile in rotation around this axis and in translation parallel to this axis, between two positions corresponding to first and second rotor positions. It can be expected that the rotor is provided with a central recess for receiving a screw mounting the rotor on the shaft, this screw being arranged substantially along the aforementioned axis.
  • the rotor and / or the drive shaft are able to be immobilized, in their translation movement parallel to the axis mentioned above, in an intermediate position between the first and second positions.
  • This aspect of the invention makes it possible to envisage to use the stirrer while the magnetic coupling effort between the rotor and the propeller is decreased compared to the position where the respective coupling means are opposite, so that the drive torque of the propeller is limited.
  • This is advantageous when it is desired to use the stirrer with a mixture whose viscosity is variable, for example made of a chemical reaction. In this case, the agitator is blocked when the viscosity of the mixture is such that the couple can be transmitted to the propeller is less than that which would be necessary to put it in motion in this mix.
  • the tree drive is slidably mounted inside a tree hollow out of a gearbox, these drive shafts and hollow shaft being integral in rotation.
  • reducer we means any device for transmitting a movement of rotation, regardless of its reduction ratio. He can in particular, it is a 1/1-angle angle gear.
  • the hollow shaft carries a nut whose internal thread is able to cooperate with an external thread of a threaded rod integral with the drive shaft. This allows you to create a system, with nut and worm, position adjustment in translation of the drive shaft and the rotor.
  • the stem threaded thread is advantageously provided at one of its ends protruding outside the hollow shaft, means controlling its rotation about its axis. In this case, a protective cover of this end of the threaded rod and these control means can be provided, this hood being mounted of Removable way on the reducer.
  • the rotor can be controlled in translation along the aforementioned axis by a pneumatic or hydraulic cylinder.
  • the invention also relates to a method for adjusting the limiting torque of force transmission of an agitator such as previously described, which consists in adjusting the position of the rotor along this axis, so that the first and second magnetic coupling means are more or less opposite. Thanks to the method of the invention, the transmissible torque between the rotor and the propeller is more or less important, as indicated above.
  • a container 1 is formed of a tank 2 in which is arranged a mixture 3, while a lid 4 is intended to close an upper opening of the tank.
  • a propeller 8 is arranged inside the tank 2, in the mixture 3. the rotation of the impeller 8 by the motor 7 results in a displacement of the blades 8a, two of which are visible in the figures, about an axis of rotation X-X ' , which has the effect of stirring the mixture 3.
  • the flange 5 form a blind sleeve 10 which extends inside the tank 2.
  • a bearing 11 is mounted on the end 10a of the sleeve 10 through a pin 12 whose threaded end 12 a is received in a thread 10b of the end 10a of the sleeve 10.
  • the bearing 11 supports a sleeve 13 whose outer surface 13a is a bearing surface.
  • the screw 8 has a head 14 formed of a circular ring 15 whose inner surface 15 a is intended to fit around the surface 13 a of the sleeve 13.
  • a sliding bearing is thus formed by contact, for example metal -metal, between the surfaces 13a and 15 a.
  • Three branches two of which are visible in the figures with the reference 15 b , and which are evenly distributed around the periphery of the ring 15, extend outwardly therefrom and support a sleeve 16 arranged around the blind sleeve 10.
  • the blades 8a of the impeller 8 are welded to the outside of the sheath 16.
  • This sheath 16 carries on its inner surface 16a facing the sleeve 10, two rows of permanent magnets 17 whose polarity north-south is directed in directions AA 'and BB' generally perpendicular to the axis X-X '.
  • a rotor 20 is disposed within the sleeve 10 and includes a first portion shaped bushing 20 has on the outer surface 20 b of which are mounted permanent magnets 21 aligned with the magnets 17 in the configuration of Figure 2 In this configuration, the polarity directions CC 'and DD' of the magnets 21 are substantially aligned with the directions AA 'and B-B'.
  • the rotor 20 is provided to rotate about the axis XX 'and drive, thanks to the magnetic coupling formed between the magnets 21 and 17, the helix 8 rotating about this axis.
  • the flange 5 is secured to a spacer 25 on which the gearbox 6 is mounted.
  • the spacer 25 defines a housing cylindrical 26 for receiving the shaft 22.
  • a cover 38 is mounted on the gear 6 about the end 33 b of the threaded rod 33 in order to protect the elements 35 to 37.
  • the cover 38 made of metal or plastic, can be screwed or clipped to the gear 6.
  • DC polarity directions' and DD 'of the magnets 21 are offset with respect to polarity directions AA and BB' of the magnets 17 by a distance d such that the magnetic coupling force between the magnets is substantially zero. In other words, then there is no significant magnetic interaction between the magnets 17 and 21.
  • the propeller 8 can be removed, without the magnetic forces exerted between the magnets 17 and 21 are opposed in a sensible way.
  • the propeller 8 can be put back in place without being exerted on the magnets 17 an excessive attraction effort due to magnets 21.
  • the maximum torque value transmissible depends on the proportion of magnets 17 and 21 which are facing and create a magnetic coupling effort part. It is possible to calibrate the stirrer of the invention to determine the maximum transmittable torque as a function of the position of the rotor 20. After this calibration, we can graduate the rod 33, which allows a user to move it to the inside of the tube 27 as a function of the limit or maximum torque wish.
  • An unrepresented motion detection device effective helix 8 can be associated with the agitator of the invention so that the operator is warned when the propeller 8 is no longer running while the engine 6 is running, such situation corresponding to a predetermined value of viscosity for mixing 3.
  • the engine stop 7 can be programmed in These conditions.
  • the hood 38 is reassembled on the reducer 6.
  • the agitator of this second embodiment differs from the previous essentially in that the end 33b of a rod 33 ', which is not threaded, is secured to a piston 50 movable in translation along the axis X-X 'inside a cylinder 51, elements 50 and 51 belonging to a pneumatic cylinder 52 supplied with air through two ducts 53 and 54.
  • the rod 33 is displaced along the axis X-X ', which allows move the magnets 21 of the rotor 20 relative to the magnets 17 sheath 16, as in the first embodiment.
  • the cylinder 52 could also be a cylinder hydraulic.
  • a cylinder allows a quick maneuver of the rotor 20 inside the sleeve 10, such a maneuver that can be automated.
  • Rotor Displacement Control Systems 20 inside the sleeve 10 may be envisaged, in particular a spring or cam system.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Toys (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Claims (10)

  1. Rührwerk mit magnetischem Antrieb, wobei das Rührwerk einen Flansch (5) umfaßt, der in abgedichteter Weise in einer Wand (2a) eines Behälters (1) befestigt ist und mit einer Sackbuchse (10) versehen ist, in deren Inneren ein ein erstes Mittel zur magnetischen Kopplung (21) tragender Rotor (20) gelagert ist, während eine um die Buchse herum angeordnete Schraube (8) mit einem zweiten Mittel (47) zur magnetischen Kopplung für den Antrieb der Schraube um eine Drehachse (X-X') ausgerüstet ist, dadurch gekennzeichnet, daß der Rotor (20) parallel zur Achse (X-X') im Inneren der Buchse (10) zwischen einer ersten Position, in der das erste und das zweite Mittel (17, 21) zur Kopplung im wesentlichen gegenüberstehend (A-A', B-B', C-C', D-D'), derart, daß sie für den Drehantrieb der Schraube (8) zusammenarbeiten und einer zweiten Position translatorisch beweglich ist, in der sie sich nicht oder wenig untereinander beeinflussen, derart, daß die Schraube (8) in Bezug auf die Buchse (10) ohne merkbare Beeinflussung durch das erste und zweite Mittel (17, 21) zur Kopplung verschoben werden kann.
  2. Rührwerk nach Anspruch 1, dadurch gekennzeichnet, daß der Rotor (20) in Drehung um die Achse (X-X') und in geradliniger Bewegung parallel zur Achse durch eine Antriebswelle (22) verschoben wird, die in Drehung um die Achse und in geradliniger Bewegung parallel zur Achse zwischen zwei der ersten und zweiten Position des Rotors entsprechenden Positionen gleichfalls beweglich ist.
  3. Rührwerk nach Anspruch 1, dadurch gekennzeichnet, daß der Rotor (20) mit einer zentralen Aussparung (20c) zur Aufnahme einer Befestigungsschraube (23) des Rotors auf der Welle (22) versehen ist, wobei die Schraube im wesentlichen entsprechend der Achse (X-X') angeordnet ist.
  4. Rührwerk nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Rotor (20) und/oder die Welle (22) in ihrer translatorischen Bewegung parallel zur Achse (X-X') in einer Zwischenposition zwischen der ersten und zweiten Position festlegbar sind.
  5. Rührwerk nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die Antriebswelle (22) gleitend im Inneren einer Hohlaausgangswelle (27) eines Untersetzungsgetriebes (6) montiert ist, wobei die Antriebswellen und die Hohlwelle in Drehung (32) fest miteinander verbunden sind.
  6. Rührwerk nach Anspruch 5, dadurch gekennzeichnet, daß die Hohlwelle (27) eine Mutter (35) trägt, die mit einem fest mit der Antriebswelle (22) verbundenen Gewindestab (33) zusammenarbeiten kann.
  7. Rührwerk nach Anspruch 6, dadurch gekennzeichnet, daß der Gewindestab (33) an einem seiner Enden (33b), das nach außen, zur Hohlwelle (27) gesehen, herausragt, mit Mitteln (36, 37) zur Steuerung ihrer Drehung im die Achse (X-X') versehen ist.
  8. Rührwerk nach Anspruch 7, dadurch gekennzeichnet, daß es eine Schutzhaube (38) des Endes (33b) der Gewindestange (33) und der Steuermittel (36, 37) umfaßt, wobei die Haube lösbar auf dem Untersetzungsgetriebe (6) befestigt ist.
  9. Rührwerk nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Rotor (20) in geradliniger Bewegung entsprechend der Achse durch eine pneumatische oder hydraulische Kolben/Zylinderanordnung (52) gesteuert wird.
  10. Verfahren zum Regeln des Grenzmomentes der Kraftübertragung eines Rührwerkes mit magnetischem Antrieb, das von einem Flansch (5) gestützt wird, der in abgedichteter Weise in einer Wand (2a) eines Behälters (1) befestigt ist und mit einer Sackbuchse (10) versehen ist, in deren Inneren ein ein erstes Mittel (21) zur magnetischen Kopplung tragender Rotor (20) gelagert ist, während eine um die Buchse herum angeordnete Schraube (8) mit einem zweiten Mittel (17) zur magnetischen Kopplung für den Antrieb der Schraube um eine Drehachse (X-X') herum ausgerüstet ist, dadurch gekennzeichnet, daß es darin besteht, die Position des Rotors längs der Achse (X-X') derart zu regeln, daß das erste und das zweite Mittel (17, 21) zur magnetischen Kopplung sich mehr oder weniger gegenüberstehen.
EP99420233A 1999-01-28 1999-11-26 Verfahren zur Drehmomenteinstellung für die Kraftübertragung eines Rührwerk mit magnetischem Antrieb Expired - Lifetime EP1023936B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9901130A FR2788995B1 (fr) 1999-01-28 1999-01-28 Agitateur a entrainement magnetique et procede du reglage du couple limite de transmission d'effort d'un tel agitateur
FR9901130 1999-01-28

Publications (3)

Publication Number Publication Date
EP1023936A1 EP1023936A1 (de) 2000-08-02
EP1023936B1 true EP1023936B1 (de) 2003-01-08
EP1023936B2 EP1023936B2 (de) 2007-03-07

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ID=9541461

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Application Number Title Priority Date Filing Date
EP99420233A Expired - Lifetime EP1023936B2 (de) 1999-01-28 1999-11-26 Verfahren zur Drehmomenteinstellung für die Kraftübertragung eines Rührwerk mit magnetischem Antrieb

Country Status (6)

Country Link
US (1) US6206562B1 (de)
EP (1) EP1023936B2 (de)
AT (1) ATE230628T1 (de)
CA (1) CA2291500C (de)
DE (1) DE69904803D1 (de)
FR (1) FR2788995B1 (de)

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CA2291500A1 (fr) 2000-07-28
US6206562B1 (en) 2001-03-27
CA2291500C (fr) 2008-05-27
DE69904803D1 (de) 2003-02-13
FR2788995A1 (fr) 2000-08-04
EP1023936B2 (de) 2007-03-07
FR2788995B1 (fr) 2001-04-06
EP1023936A1 (de) 2000-08-02
ATE230628T1 (de) 2003-01-15

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