EP3175912A2 - Agitateur magnétique pour un dispositif d'agitation magnétique - Google Patents

Agitateur magnétique pour un dispositif d'agitation magnétique Download PDF

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Publication number
EP3175912A2
EP3175912A2 EP16198502.3A EP16198502A EP3175912A2 EP 3175912 A2 EP3175912 A2 EP 3175912A2 EP 16198502 A EP16198502 A EP 16198502A EP 3175912 A2 EP3175912 A2 EP 3175912A2
Authority
EP
European Patent Office
Prior art keywords
magnetic
magnetic stirrer
stirring
rotation
base body
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
EP16198502.3A
Other languages
German (de)
English (en)
Other versions
EP3175912B1 (fr
EP3175912A3 (fr
Inventor
Kai Kress
Klaus Kaufmann
Michael Fischer
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.)
2mag AG
Original Assignee
2mag AG
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Filing date
Publication date
Application filed by 2mag AG filed Critical 2mag AG
Publication of EP3175912A2 publication Critical patent/EP3175912A2/fr
Publication of EP3175912A3 publication Critical patent/EP3175912A3/fr
Application granted granted Critical
Publication of EP3175912B1 publication Critical patent/EP3175912B1/fr
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Anticipated expiration legal-status Critical

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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

Definitions

  • the present invention relates to a magnetic stirrer for a magnetic stirring device and a magnetic stirring device with a corresponding magnetic stirrer.
  • so-called magnetic stirrers are used in a wide variety of stirring situations.
  • these are so-called magnetic stirring bars, which have an internal magnetic body.
  • This internal magnetic body is provided with a corresponding magnetic polarity, so that it aligns in an applied magnetic field according to this polarity.
  • magnetic drives are usually provided which can provide such a magnetic field and set it in rotation.
  • the magnetic stir bar follows this rotating magnetic field and is thus also set in rotation.
  • a disadvantage of the known magnetic stirrers is that they are essentially limited to low-viscosity liquids with regard to their intended use. Accordingly, the higher the viscosity of a liquid, the stronger the resistance force against which the stirrer must fight during rotation. If this resistance force becomes too great, the magnetic field of the magnetic drive rotates, so to speak, empty under the magnetic stir bar and this remains in a standing position. This is based in particular on the fact that from the state out a correspondingly higher resistance moment must be overcome in order to put the magnetic stir bar in its rotating motion. However, even if a magnetic stir bar in a rotating situation to stir a liquid to be stirred with high viscosity, he can can not reach this state because it can not move from the starting position in a resting state.
  • a magnetic stirrer according to the invention for a magnetic stirrer has a main body with an axis of rotation and at least two magnetic bodies.
  • the magnetic bodies are designed for magnetic coupling with a magnetic drive of the magnetic stirring device.
  • a magnetic stirrer according to the invention is characterized in that the main body has at least one friction stirring surface for the transfer of stirring energy to a liquid to be stirred by means of fluid friction. In this case, the at least one friction stirring surface forms a stirring angle of less than 15 ° with a direction of rotation about the axis of rotation.
  • the magnetic stirring device for the magnetic coupling is equipped with a magnetic drive. It is fundamentally irrelevant whether this magnetic drive provides permanent magnets or forms a corresponding magnetic field with the aid of current-carrying windings. Due to the two magnetic body, which are preferably designed as permanent magnets, the Magnetic coupling are provided so that the magnetic stirrer follows a rotating magnetic field and is even offset in rotation about the axis of rotation.
  • the introduction of the stirring energy differs decisively from the known magnetic stirrer bars.
  • a friction stirring surface is now provided which, contrary to the known Schubrlick lake, which introduces the stirring energy by a corresponding employment of these Schubrlick inhabit against the liquid to be stirred, now relies on the fluid friction.
  • the stirring energy can be introduced into the liquid to be stirred only at higher rotational speeds of the magnetic stirrer and thus increasing fluid friction between the Reibrrockrüh Structure and the liquid to be stirred.
  • the Reibungsrlick Structure forms a low angle of attack or a small stirring angle of less than 15 °.
  • the stirring angle of the friction stirring surface is less than approximately 10 ° or even more preferably less than approximately 5 °. Particularly preferred and with great advantage is, if the Reibungsrlick Structure is aligned substantially along the respective rotational direction and thus the stirring angle about 0 ° occupies.
  • the magnetic bodies are preferably attached to or in the base body. It may even be advantageous if the main body substantially completely closes off the magnetic stirrer to the outside, so that the further components, and in particular also the magnetic bodies, are arranged essentially within the main body. This leads to a particularly good protection, especially for aggressive to be stirred liquids, to reduce the corresponding wear due to chemical interference or even completely prevent.
  • the rotation axis is formed substantially perpendicular and defines in this way a vertical orientation of the magnetic stirrer. The radial orientation to this axis of rotation correspondingly corresponds to a horizontal plane which defines this magnetic stirrer.
  • the friction stirring surface forms the substantially only stirring surface, or, as explained below, the main stirring surface. This results in that the resistance force at the start of the magnetic stirrer can be substantially reduced to a minimum or even zero.
  • the at least one friction stir surface forms a main stirring surface of the main body, which in particular forms more than 40% of the surface of the main body.
  • a main stirring surface of the main body is to be understood as that surface which provides the main energy input in a stirring situation. Usually, this is also the largest functional surface of the body, which is designed for the stirring functionality. If, for example, the upper side of the base body is made available as the main stirring surface, then this is preferably completely formed as a friction stirring surface.
  • circumferential side surfaces in a conical or cylindrical configuration as well as the underside of the corresponding basic body can also be provided as a friction stirring surface.
  • these main stirrer surfaces can also be distinguished from smaller auxiliary stirrer surfaces, wherein preferably all of the stirrer surfaces of the main body provide a friction stir surface formation.
  • more than 60%, preferably more than 80%, particularly preferably more than 90%, of the surface of the main body is provided as a friction stir surface.
  • the base body has at least one vertical passage opening.
  • a vertical passage opening is freely selectable with respect to the geometry of the border.
  • geometrically simple shapes such as triangles, rectangles or circular cutouts.
  • the provision of round holes as a vertical passage opening brings advantages in terms of flow and production with it.
  • the functionality of vertical through-holes allows, for example, a gripping for insertion and removal of the stirrer from the stirred container by hand or a corresponding gripping means.
  • a flow path is released, which can also provide a vertical flow of the body available.
  • the vertical through-hole reduces the likelihood of lifting the topflow along the friction stir surface, thus further increasing the stability of stirring power input.
  • Another advantage of a vertical flow through the vertical through-holes is that in this way the stirrer remains with great certainty at the bottom of the stirred tank even at high speeds.
  • the base body has at least two vertical passage openings, which are arranged in particular in a symmetrical manner about the axis of rotation.
  • a symmetrical arrangement of the at least two passage openings means that the described effect of the vertical passage openings is also provided in a symmetrical manner. This leads to a further stabilization of the magnetic stirrer in the application situation.
  • the geometry of the passage openings is, as described, basically open, so that different geometries for the different passage openings in a common base body can be used.
  • the main body has a bearing section, with a bearing device for a rotational bearing about an axis of rotation.
  • a bearing portion may be formed, for example, as a plain bearing with a corresponding bearing bush.
  • Such a bearing section can now be used for the connection of a correspondingly later explained holding device.
  • a connection to a corresponding counter bearing device of a stirred container is conceivable here.
  • the provision of a bearing device with a corresponding bearing portion now leads to a contact of the soil or other internal components of a stirred container is reduced or even completely avoided. Corresponding wear due to friction of surfaces on one another can thus be reduced or even completely avoided.
  • a holding device is rotatably mounted on the storage device, with at least one footprint for a standing storage on the bottom of a stirred container.
  • a holding device can be provided, for example, as a tripod or another multi-leg with a preferably odd number of legs. Each of these legs preferably has a footprint in order to ensure a corresponding standing storage.
  • the basic body has an even number of at least four magnetic bodies, which are arranged alternately around the axis of rotation with a vertical orientation of the polarity with different polarity.
  • exactly four magnetic bodies are preferred, in order, on the one hand, to be able to provide this cross arrangement of the poling, and, on the other hand, to form a sufficiently large scattering behavior in order to be able to exclude a spinning of the rotating magnetic field under the magnetic stirrer with high probability.
  • This cross arrangement leads in particular when embedded in the body magnetic bodies to the fact that the magnetic stirrer better centered both stable during insertion, as well as during subsequent operation and stable.
  • a correspondingly adapted magnetic drive accordingly has a corresponding cross-polarity, so that the insertion is facilitated before the start of the stirring process.
  • the vertical direction of the polarity is aligned parallel or along the axis of rotation, as already explained.
  • the main body has a magnetic shielding means for shielding the magnetic field of the magnetic body downwards.
  • the magnetic bodies are preferably provided with a vertical or substantially vertical polarity. This means that either north or south pole points upwards and the corresponding opposite pole points vertically downwards.
  • the necessary magnetic field for the magnetic coupling with the magnetic drive is the lower part of this magnetic field.
  • the magnetic shielding means is preferably arranged in an annular manner above the magnetic bodies.
  • soft iron can be used as a material for the shielding.
  • a magnetic return is available on the upper side of the magnetic body is set so that the magnetic force acts substantially exclusively or at least in an amplified manner from the magnetic bodies vertically downwards.
  • the base body in particular on the friction stir surface, has at least one attachment interface for attachment of a stirring means with a push-stirring surface.
  • the Schubrlick Structure is, as already explained in the introduction, to be distinguished from the Reibungsrlick Structure to the effect that in a Schubrlick Structure by direct resistance of the liquid to be stirred and pushing them the stirring energy can be introduced.
  • the corresponding Schubrlick Structure is thus preferably perpendicular to the stirring direction for a corresponding pushing the liquid to be stirred.
  • the at least one fastening interface has a fastening direction which is aligned in an angular range of approximately 90 ° in the direction of rotation and along the radial direction of the rotational axis of the base body. This is provided in particular for insertion.
  • the actual attachment can be provided in a clamping, positive or otherwise fixing manner available. By the orientation of this embodiment, even the attachment is easier to train or even completely avoidable. The centrifugal forces and the corresponding acceleration forces ensure that the associated stirring means is pressed against corresponding stops of the fastening interface.
  • a magnetic stirring device with a magnetic drive and a magnetic stirrer according to the present invention wherein the magnetic drive has at least two drive magnet bodies with polarity corresponding to the magnet bodies of the magnetic stirrer.
  • a magnetic stirring device with electrically operable magnetic drive which has corresponding electrical coils to provide the desired corresponding polarity to the magnetic bodies of the magnetic stirrer available.
  • the Fig. 1 to 4 show a first embodiment of a magnetic stirrer according to the invention 10.
  • This is equipped with a substantially flat and disc-shaped and circular base body 20.
  • the upper side of this main body 20 is substantially completely formed as a main stirring surface in the form of a friction stirring surface 22.
  • This now makes at startup substantially no resistance and turns in a liquid to be stirred 210 substantially completely.
  • a corresponding holding device 50 is provided as a tripod, which in particular the Fig. 4 shows well in the bottom view.
  • a bearing device 40 in a bearing section 26, which is designed here as a slide bearing.
  • Fig. 1 to 4 it can be seen further, it is a magnetic stirrer 10, in the base body 20 here four different magnetic body 30 are embedded. These four magnetic bodies 30 are distributed symmetrically about the rotation axis RA, and are formed with alternating vertical polarity change. So shows, for example, the Fig. 4 in the lower view, the south poles S and the north poles N alternate in a cross shape.
  • a magnetic shielding means 28 in the form of a soft iron ring is provided here, which is arranged substantially completely circumferentially above the magnetic bodies 30.
  • the Fig. 5 schematically shows how a Magnetirroundvorschiques invention 100 is formed.
  • the magnetic drive 110 is equipped with a motor 114 which can set a driven combination of corresponding drive magnetic bodies 112 in rotation. These drive magnetic bodies 112 are provided with a corresponding polarity provided to the corresponding magnetic bodies 30 of the magnetic stirrer 10 used. Based on this embodiment, the startup will now be explained again. As soon as the stirring container 200 has been placed on the magnetic stirring device 100 or the magnetic drive 110, the corresponding liquid 210 to be stirred can be introduced. Subsequently, or even before the introduction of the liquid 210, the magnetic stirrer 10 is inserted into the desired position according to FIG.
  • FIG. 6 a further embodiment of a magnetic stirrer 10 is shown. This is now formed without through holes 24, but additionally provided with a mounting interface 60.
  • an additional stirring means 70 with a Schubrrock Structure 72 can be used along different mounting directions BR. By aligning the Schubrrock compounds along a radial extent to the axis of rotation RA and against the rotational direction RR can be dispensed with a complicated attachment at least partially or even entirely for the additional stirring means 70.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
EP16198502.3A 2015-11-11 2016-11-11 Agitateur magnétique pour un dispositif d'agitation magnétique Active EP3175912B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015119433.3A DE102015119433A1 (de) 2015-11-11 2015-11-11 Magnetrührer für eine Magnetrührvorrichtung

Publications (3)

Publication Number Publication Date
EP3175912A2 true EP3175912A2 (fr) 2017-06-07
EP3175912A3 EP3175912A3 (fr) 2017-09-06
EP3175912B1 EP3175912B1 (fr) 2020-08-05

Family

ID=57321146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16198502.3A Active EP3175912B1 (fr) 2015-11-11 2016-11-11 Agitateur magnétique pour un dispositif d'agitation magnétique

Country Status (2)

Country Link
EP (1) EP3175912B1 (fr)
DE (1) DE102015119433A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112421807A (zh) * 2019-08-23 2021-02-26 广东美的生活电器制造有限公司 食物处理装置、转子组件的控制方法、系统及存储介质
CN114939931A (zh) * 2022-05-30 2022-08-26 广州市第一装修有限公司 一种基于磁力搅拌的商业广场装修用灰浆搅拌装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1072538A (fr) * 1975-07-03 1980-02-26 Leonard E. Brown Agitateur magnetique supporte par le bas
US4209259A (en) * 1978-11-01 1980-06-24 Rains Robert L Magnetic mixer
DE19803477C1 (de) * 1998-01-29 1999-09-16 Helmut Herz Verfahren und Einrichtung zum Durchmischen einer, Flüssigkeit zumindest enthaltenden Behälterfüllung
JP4252993B2 (ja) * 2005-05-12 2009-04-08 株式会社荏原製作所 混合器及び反応装置
US7891861B2 (en) * 2007-09-20 2011-02-22 Fujifilm Corporation Mixing method and mixer for mixing polymer dope, and solution casting process and apparatus
EP2905070B1 (fr) * 2010-02-12 2018-08-08 Spinchem AB Dispositif pour la réalisation d'une transformation chimique dans un milieu fluide
KR20110097752A (ko) * 2011-08-17 2011-08-31 주식회사 세원주방산업 교반장치

Non-Patent Citations (1)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112421807A (zh) * 2019-08-23 2021-02-26 广东美的生活电器制造有限公司 食物处理装置、转子组件的控制方法、系统及存储介质
CN114939931A (zh) * 2022-05-30 2022-08-26 广州市第一装修有限公司 一种基于磁力搅拌的商业广场装修用灰浆搅拌装置
CN114939931B (zh) * 2022-05-30 2023-08-18 广州市第一装修有限公司 一种基于磁力搅拌的商业广场装修用灰浆搅拌装置

Also Published As

Publication number Publication date
EP3175912B1 (fr) 2020-08-05
EP3175912A3 (fr) 2017-09-06
DE102015119433A1 (de) 2017-05-11

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