EP1023936B2 - Verfahren zur Drehmomenteinstellung für die Kraftübertragung eines Rührwerk mit magnetischem Antrieb - Google Patents

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

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Publication number
EP1023936B2
EP1023936B2 EP99420233A EP99420233A EP1023936B2 EP 1023936 B2 EP1023936 B2 EP 1023936B2 EP 99420233 A EP99420233 A EP 99420233A EP 99420233 A EP99420233 A EP 99420233A EP 1023936 B2 EP1023936 B2 EP 1023936B2
Authority
EP
European Patent Office
Prior art keywords
rotor
axis
sleeve
shaft
rotation
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)
Other versions
EP1023936A1 (de
EP1023936B1 (de
Inventor
Philippe Eyraud
Guy Flavien
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.)
Mixel SAS
Original Assignee
Mixel SAS
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9541461&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1023936(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mixel SAS filed Critical Mixel SAS
Publication of EP1023936A1 publication Critical patent/EP1023936A1/de
Application granted granted Critical
Publication of EP1023936B1 publication Critical patent/EP1023936B1/de
Publication of EP1023936B2 publication Critical patent/EP1023936B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
    • B01F33/4535—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements using a stud for supporting the stirring element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements

Definitions

  • the invention relates to a method for adjusting the limit torque of force transmission of a magnetic drive stirrer.
  • a magnetic drive agitator has the advantage that the motion of the helix it comprises is performed by a magnetic coupling which takes place without physical contact between two rotating parts, one of which is driven by the output shaft. of an electric motor while the other is constituted by a propeller. This allows to arrange the portion associated with the electric motor shaft outside the container while the propeller is installed inside the container. Any danger of leakage at the agitator can be avoided. This is particularly useful when the mixture is toxic or where pollution thereof by external agents should be avoided such 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 impeller of the stirrer with sufficient force.
  • it is sometimes necessary to dismantle the propeller especially for reasons of maintenance or inspection of the container in which the mixture is formed (see for example EP 0437394). It is thus common to provide for cleaning the impeller of an agitator and / or sterilizing it outside the container at the end of each batch of manufacture.
  • the magnetic forces required to drive the propeller of an industrial agitator are such that the effort to be exerted by an operator to remove the propeller is very important, because this effort must overcome both the weight of the propeller. propeller and the magnetic coupling force necessary for the drive. This is even more critical when the propeller is put back in place, since during the presentation of the propeller it happens that the magnetic force is so intense that the propeller escapes the operator and come and press against the support, causing damage to the bearings or even injury to the operator.
  • the invention relates to a method for adjusting the limit torque of force transmission of an agitator as previously described, which consists in adjusting the position of the rotor along this axis, so that the first and second coupling means magnetic 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.
  • the invention makes it possible to envisage using the stirrer while the magnetic coupling force between the rotor and the propeller is decreased with respect to the position where the respective coupling means are facing each other, so that the torque propeller drive is limited.
  • This is advantageous when it is desired to use the stirrer with a mixture whose viscosity is variable, for example due to a chemical reaction.
  • the agitator is blocked when the viscosity of the mixture is such that the torque that can be transmitted to the propeller is less than that which would be necessary to set it in motion in this mixture.
  • a container 1 is formed of a tank 2 in which is disposed a mixture 3, while a lid 4 is provided 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 forms a blind sleeve 10 which extends inside the tank 2.
  • a bearing 11 is mounted on the end 10a of the sleeve 10 through an axis 12, the threaded end 12a is received in an internal 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 ring 15 whose inner circular surface 15a 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 comprises a first sleeve-shaped portion 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 made between the magnets 21 and 17, the helix 8 rotating about this axis.
  • the rotor 20 is made integral with a drive shaft 22 through a screw 23 disposed in the central recess 20c of the sleeve 20 has along the axis XX 'and into an end of thread 22 has shaft 22.
  • the rotor 20 is provided with an axial bore 20 for receiving the end 22 b of the shaft 22 in which is provided the internal thread 22a.
  • a screw 24 is disposed in a radial bore of the portion of the rotor 20 in which the bore 20 d is formed so as to bear against the radial outer surface of the end 22b of the shaft 22, so as to immobilize in rotation the elements 20 and 22.
  • the flange 5 is secured to a spacer 25 on which the gearbox 6 is mounted.
  • the spacer 25 defines a cylindrical housing 26 for receiving the shaft 22.
  • An output shaft 27 of the gearbox 6 is driven by pinions 28 and 29, the pinion 29 being engaged by a shaft 30 with the output shaft 31 of the motor 7.
  • the shaft 27 is hollow and defines a internal volume in which the shaft 22 can slide, the shafts 22 and 27 being integral in rotation thanks to a key 32.
  • the shaft 22 can slide inside the shaft 27 and be rotated by the thanks to the key 32.
  • Note 27 has a longitudinal groove of the shaft 27 into which the key 32 can slide.
  • the end 22 c of the shaft 22 opposite the rotor 20 is integral with a threaded rod 33 having one end 33 a is provided to penetrate into a housing 22 of the end 22 c.
  • Two screws 34 are used to axially immobilize the end 33 a of the rod 33 inside the housing 22 d.
  • the second end 33 b of the rod 33 cooperates with a nut 35 fixed to the end of shaft 27 opposite to the spacer 25.
  • a nut 36 is immobilized on the end 32 b of the rod 33 through a pin 37. It is thus possible to rotate the threaded rod 33 inside the nut 35 by means of the nut 36.
  • a screw-nut system has thus been formed which, because of the fixed position in translation of the nut 35 with respect to the axis XX ', makes it possible to control the translation displacement of the rod 33, of the shaft 22 and of the rotor 20 between the two positions respectively represented in FIGS. 2 and 3.
  • nut 36 therefore constitutes a means of controlling the displacement of these elements along the axis X-X '.
  • 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.
  • polarity directions CC '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 force due to the magnets 21.
  • the value of the maximum transmittable torque depends on the proportion of the magnets 17 and 21 which are opposite and create a partial magnetic coupling force. It is possible to calibrate the agitator of the invention to determine the maximum transmittable torque as a function of the position of the rotor 20. After this calibration, the rod 33 can be graduated, which allows a user to move it to the desired position. inside the tube 27 as a function of the desired limit or maximum torque.
  • An unrepresented device for detecting the effective movement of the helix 8 may be associated with the agitator of the invention so that the operator is warned when the propeller 8 no longer turns while the engine 6 is operating, such a situation. corresponding to a predetermined viscosity value for the mixture 3.
  • the stopping of the motor 7 can be programmed under these conditions.
  • the agitator of this second embodiment differs from the previous one essentially in that the end 33b of a rod 33 ', which is not threaded, is integral with a piston 50 movable in translation along the axis XX' inside a cylinder 51, the elements 50 and 51 belonging to a pneumatic jack 52 supplied with air through two ducts 53 and 54.
  • the rod 33 is displaced along the axis X-X ', which makes it possible to move the magnets 21 of the rotor 20 relative to the magnets 17 of the sleeve 16, as in the first embodiment .
  • the cylinder 52 could also be a hydraulic cylinder.
  • a jack allows rapid operation of the rotor 20 inside the sleeve 10, such a maneuver can be automated.

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)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Toys (AREA)

Claims (1)

  1. 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 EP1023936B1 (de) 2003-01-08
EP1023936B2 true EP1023936B2 (de) 2007-03-07

Family

ID=9541461

Family Applications (1)

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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Also Published As

Publication number Publication date
FR2788995A1 (fr) 2000-08-04
ATE230628T1 (de) 2003-01-15
EP1023936A1 (de) 2000-08-02
US6206562B1 (en) 2001-03-27
EP1023936B1 (de) 2003-01-08
DE69904803D1 (de) 2003-02-13
CA2291500A1 (fr) 2000-07-28
CA2291500C (fr) 2008-05-27
FR2788995B1 (fr) 2001-04-06

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