EP1023936A1 - 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
EP1023936A1
EP1023936A1 EP99420233A EP99420233A EP1023936A1 EP 1023936 A1 EP1023936 A1 EP 1023936A1 EP 99420233 A EP99420233 A EP 99420233A EP 99420233 A EP99420233 A EP 99420233A EP 1023936 A1 EP1023936 A1 EP 1023936A1
Authority
EP
European Patent Office
Prior art keywords
rotor
axis
shaft
sleeve
propeller
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.)
Granted
Application number
EP99420233A
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English (en)
French (fr)
Other versions
EP1023936B2 (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
Original Assignee
Mixel
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Filing date
Publication date
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Application filed by Mixel filed Critical Mixel
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
    • 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

Definitions

  • the invention relates to a stirrer with magnetic drive and a method for adjusting the transmission limit torque effort of such an agitator.
  • Agitators are conventionally used for brewing a mixture located inside a container to avoid decantation or any other alteration of the mixture during time.
  • the advantage of a stirrer with magnetic drive that the setting in motion of the propeller which it comprises is realized by a magnetic coupling which takes place without contact physics between two rotating parts, one of which is driven by the output shaft of an electric motor while the other consists of a propeller. This allows the part associated with the electric motor shaft outside the container while the propeller is installed inside the container. Any danger of leakage from the agitator can thus 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 stirrer must be intense in order to train the agitator propeller with sufficient force.
  • it is sometimes necessary method of disassembling the propeller in particular for reasons maintenance or inspection of the container in which is formed the mixture. 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 manufacturing batch. He's sometimes necessary to dismantle the propeller to proceed with the exchange standard of wearing parts such as bearings.
  • a propeller When a propeller has been dismantled, it must be replaced with the greater precautions on its support, avoiding the most possible impacts that could damage the blades, bearings and / or the surface of the container.
  • the magnetic forces necessary for the drive of 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 required to training. This is even more critical when handing over in place of the propeller, insofar as, during the presentation of it, it happens that the magnetic force is so intense that the propeller escapes the operator and comes to tackle violently against its support, which has the consequence damage the bearings, or even injure the operator.
  • the invention relates to a stirrer with magnetic drive which includes a flange adapted to be tightly mounted 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 driving 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 next to each other, so that they cooperate for training in rotation of this propeller, and a second position where they interact little or no, so that this propeller can be moved relative to the sleeve without interaction notable first and second coupling means.
  • the movable nature of the rotor in translation it can be retracted during assembly and disassembly of the propeller, so that the coupling means magnetic that it supports, such as permanent magnets, is removed from the coupling means which equip the propeller with a sufficient distance to prevent the magnetic force between these coupling means does not disturb the mounting or the disassembly of the propeller.
  • the displacement of the rotor inside the sleeve takes place in a direction corresponding to shear the air gap between the magnetic coupling means, that is to say in practice between the permanent magnets respectively associated with the rotor and the propeller. This shear perpendicular to the magnetic force created between these magnets does not require significant effort as far where this magnetic force does not oppose this shearing.
  • the magnetic coupling between the magnets of the rotor and propeller is annihilated without this magnetic coupling strongly opposes the translation of the rotor.
  • the invention therefore makes it possible to set up the propeller without interference with the magnets of the rotor, then move it until it can drive the propeller, this displacement being carried out in a direction such that it it is not necessary to overcome an intense magnetic effort.
  • the rotor is moved in rotation around its axis and in translation parallel to 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.
  • 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.
  • the rotor is provided with a central recess for receiving a screw for 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 translational movement parallel to the axis above, in an intermediate position between the first and second positions.
  • This aspect of the invention makes it possible to envisage to use the agitator 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 you want to use the agitator 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 torque that can be transmitted to the propeller is less than that which would be necessary to set it in motion in this mixture.
  • the tree drive is slidably mounted inside a shaft output hollow of a reducer, these drive shafts and hollow shaft being integral in rotation.
  • reducer we hears any device for transmitting a movement of rotation, whatever its reduction ratio. He can particular be a 1/1 ratio 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 creates a system, with nut and worm, for adjusting the position in translation of the drive shaft and the rotor.
  • the rod threaded is advantageously provided, at one of its ends protruding outside the hollow shaft, means control of its rotation around its axis. In this case, a protective cover for this end of the threaded rod and these control means can be provided, this cover being mounted removable on the reducer.
  • the rotor can be controlled in translation along the above axis by a pneumatic or hydraulic cylinder.
  • the invention also relates to a method for adjusting the force transmission torque limit 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 process 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 from a tank 2 in which is arranged a mixture 3, while a cover 4 is designed to close an upper opening of the tank.
  • a propeller 8 is disposed inside the tank 2, in the mixture 3. The rotation of the propeller 8 by the motor 7 results in a displacement of its blades 8 a , two of which are visible in the figures, around an axis of rotation XX ' , which has the effect of mixing 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 10 a of the sleeve 10 by means of an axis 12 whose threaded end 12 a is received in a tapping 10 b of the end 10 a of the sleeve 10.
  • the bearing 11 supports a bush 13 whose outer surface 13 a constitutes a bearing surface.
  • the propeller 8 comprises a head 14 formed of a ring 15 whose internal circular surface 15 a is intended to fit around the surface 13 a of the sleeve 13.
  • a smooth bearing is thus produced by contact, for example metal -metal, between surfaces 13 a and 15 a .
  • Three branches two of which are visible in the figures with the reference 15b , and which are regularly distributed around the periphery of the ring 15, extend outwards from the latter and support a sheath 16 disposed 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 inside the sleeve 10 and comprises a first sleeve-shaped part 20 a on the external surface 20 b of which are mounted permanent magnets 21 aligned with the magnets 17, in the configuration of FIG. 2 In this configuration, the directions CC ′ and DD ′ of polarity of the magnets 21 are substantially aligned with the directions AA ′ and B-B ′.
  • the rotor 20 is provided to rotate around the axis XX 'and cause, thanks to the magnetic coupling produced between the magnets 21 and 17, the propeller 8 in rotation about this axis.
  • the rotor 20 is made integral with a drive shaft 22 by means of a screw 23 disposed in the central recess 20 c of the sleeve 20 a along the axis XX 'and penetrating into an end thread 22 a of l 'shaft 22.
  • the rotor 20 is provided with an axial bore 20 d for receiving the end 22 b of the shaft 22 in which is formed the thread 22 a .
  • a screw 24 is disposed in a radial bore in the part of the rotor 20 in which the bore 20 d is formed, so as to come into abutment against the external radial surface of the end 22b of the shaft 22, so as to immobilize elements 20 and 22 in rotation.
  • the flange 5 is integral with a spacer 25 on which is mounted the reducer 6.
  • the spacer 25 defines a housing cylindrical 26 for receiving the shaft 22.
  • An output shaft 27 of the reduction gear 6 is driven by pinions 28 and 29, the pinion 29 being engaged, thanks to 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 by means of a key 32.
  • the shaft 22 can slide inside the shaft 27 and be driven in rotation by that -this, thanks to the key 32.
  • Note 27 has a longitudinal groove in the shaft 27 in 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, a first end 33 a is provided for entering a housing 22 d of the end 22 c .
  • Two screws 34 serve 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 the shaft 27 opposite the spacer 25.
  • a nut 36 is immobilized on the end 32 b of the rod 33 by means of a pin 37. It is thus possible to rotate the threaded rod 33 inside the nut 35 thanks to the nut 36.
  • a screw-nut system has thus been formed which, due to the fixed position in translation of the nut 35 relative to the axis XX ′, makes it possible to control the displacement in translation of the rod 33, of the shaft 22 and of the rotor 20 between the two positions respectively shown in FIGS. 2 and 3.
  • L 'nut 36 therefore constitutes a means of controlling the movement of these elements along the axis X-X'.
  • a cover 38 is mounted on the reduction gear 6 around 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 onto the reduction gear 6.
  • the directions of polarity CC 'and DD' of the magnets 21 are offset with respect to the directions of polarity AA and BB 'of the magnets 17 by a distance d such that the magnetic coupling force between these magnets is practically zero. In other words, there is then no significant magnetic interaction between the magnets 17 and 21.
  • the propeller 8 can therefore be removed, without the magnetic forces exerted between the magnets 17 and 21 being opposed to it. in a sensitive way.
  • propeller 8 can be replaced without exerting on the magnets 17 too great an attraction force due to the magnets 21.
  • the maximum torque value transmissible depends on the proportion of magnets 17 and 21 which are facing each other and create a magnetic coupling effort partial. It is possible to calibrate the agitator of the invention to determine the maximum transmissible torque as a function of the position of rotor 20. After this calibration, you can scale the rod 33, which allows a user to move it towards inside the tube 27 as a function of the limit or maximum torque wish.
  • a device (not shown) for detecting movement propeller size 8 can be combined with the agitator the invention so that the operator is notified when the propeller 8 no longer turns while the motor 6 is running, such situation corresponding to a predetermined viscosity value for mixing 3.
  • the engine 7 can be stopped in 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 cylinder 52 supplied with air through two conduits 53 and 54.
  • the rod 33 is moved along the axis XX ′, which makes it possible to 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 jack allows rapid maneuvering of the rotor 20 inside the sleeve 10, such an operation 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)
  • Toys (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
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 true EP1023936A1 (de) 2000-08-02
EP1023936B1 EP1023936B1 (de) 2003-01-08
EP1023936B2 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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EP1475566A2 (de) * 2003-05-07 2004-11-10 Ashland Inc. Vorrichtung und Verfahren zur Brennstoffbehandlung mit Magnetkupplung
CN110098537A (zh) * 2019-05-16 2019-08-06 程少云 一种拔插便捷插座

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DE3039810A1 (de) * 1980-10-22 1982-05-19 Franz Klaus Union Armaturen, Pumpen Gmbh & Co, 4630 Bochum Stellantrieb mit einem spaltrohr
EP0408093A1 (de) * 1989-07-12 1991-01-16 Fedegari Autoclavi Spa Magnetische Kupplung für die Übertragung von Bewegung durch die Wände abgeschlossener Gefässe
EP0437394A1 (de) * 1990-01-11 1991-07-17 Societe Generale Pour Les Techniques Nouvelles S.G.N. Rührerantreibungseinheit, insbesondere ein MischerDekantierapparat zur Verwendung in einer Vorrichtung zur Wiederaufarbeitung von Kernbrennstoffen
EP0617999A1 (de) * 1993-03-30 1994-10-05 DRAISWERKE GmbH Mischer mit magnetischer Kupplung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1475566A2 (de) * 2003-05-07 2004-11-10 Ashland Inc. Vorrichtung und Verfahren zur Brennstoffbehandlung mit Magnetkupplung
FR2854663A1 (fr) * 2003-05-07 2004-11-12 Ashland Inc Appareil de traitement de carburant comprenant un homogeneiseur
EP1475566A3 (de) * 2003-05-07 2010-05-19 Ashland Licensing and Intellectual Property LLC Vorrichtung und Verfahren zur Brennstoffbehandlung mit Magnetkupplung
CN110098537A (zh) * 2019-05-16 2019-08-06 程少云 一种拔插便捷插座

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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
EP1023936B1 (de) 2003-01-08
ATE230628T1 (de) 2003-01-15

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