EP1816900A1 - Agitateur magnétique doté d'une plaque chauffante - Google Patents

Agitateur magnétique doté d'une plaque chauffante Download PDF

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Publication number
EP1816900A1
EP1816900A1 EP07001957A EP07001957A EP1816900A1 EP 1816900 A1 EP1816900 A1 EP 1816900A1 EP 07001957 A EP07001957 A EP 07001957A EP 07001957 A EP07001957 A EP 07001957A EP 1816900 A1 EP1816900 A1 EP 1816900A1
Authority
EP
European Patent Office
Prior art keywords
heating plate
magnetic stirrer
layer
aluminum
ceramic layer
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
EP07001957A
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German (de)
English (en)
Other versions
EP1816900B1 (fr
Inventor
Günter Vollgold
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.)
Hans Heidolph GmbH and Co KG
Original Assignee
Hans Heidolph GmbH and Co KG
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Filing date
Publication date
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Application filed by Hans Heidolph GmbH and Co KG filed Critical Hans Heidolph GmbH and Co KG
Publication of EP1816900A1 publication Critical patent/EP1816900A1/fr
Application granted granted Critical
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Revoked legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H05B3/262—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an insulated metal plate
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54

Definitions

  • the present invention relates to a magnetic stirrer with a housing and a heating plate, which is heated by a heater on its underside, wherein below the heating plate in the housing, a magnetic drive is provided which generates a changing (especially rotating) magnetic field, which is suitable to place a stirrer in a stirred vessel on the hot plate in a stirring motion.
  • magnetic stirrers in addition to simple magnetic stirrers with a non-heatable mounting surface for a vessel, magnetic stirrers are also known whose mounting plate is designed as a heating plate, so that a liquid in the vessel can be heated simultaneously during the stirring.
  • the heating plate is designed such that a magnetic field generated under the heating plate passes through the heating plate and causes the stirrer in the vessel to rotate.
  • the heating plate must have good thermal conduction properties; On the other hand, it must not influence the magnetic field.
  • essentially three non-magnetic materials have been established, namely aluminum, stainless steel and glass.
  • Magnetic stirrers with aluminum or aluminum alloy heating plates have the best thermal conductivity. This ensures good heat distribution on the heating plate.
  • the heating plate can be heated up quickly and allows good control characteristics for the temperature control of the heating plate.
  • a disadvantage of the use of aluminum or aluminum alloys, however, is the very high scratch sensitivity of the material.
  • heating plates made of aluminum are not very resistant to corrosion.
  • Heating plates of stainless steel partly also with enamel, have the advantage that they have a lower scratch sensitivity and a very good corrosion resistance.
  • stainless steel has a lower thermal conductivity than aluminum. Therefore, there is a worse heat distribution on the hot plate and a slower heating.
  • the control properties for the temperature control are characterized worse, so that a fast and accurate temperature control can only be guaranteed insufficient.
  • a hot plate made of glass ceramic has the highest protection against scratching because it has a very hard surface and is very resistant to scratching.
  • Glass ceramic heating plates are also characterized by a very good corrosion resistance. Their thermal conductivity is however clearly bad. This leads, as with stainless steel, to a poorer heat distribution and a slower heating. There are thus poor control characteristics of the temperature control.
  • a magnetic stirrer with a heated hot plate (mounting plate) is known, which on the one hand should have a chemically resistant and acid-resistant surface, on the other hand, a good heat conduction.
  • the heating plate is formed from two bonded metal layers which are rolled together and / or soldered together.
  • the upper metal layer is made of an acid-proof metal, while the lower metal layer a good conductive metal layer, which may for example consist of aluminum or an aluminum alloy. After joining the two layers, it is possible to deep draw the hot plate to produce a side edge which also has an acid resistant layer.
  • the Utility Model DE 20107769 U1 also relates to a magnetic stirrer with a heated heating plate (mounting plate). Again, a hot plate is proposed, which has an acid-resistant or chemical-resistant surface after deep drawing.
  • the deep-drawn metal plate is chromed, enamelled or provided with a ceramic coating or with a coating of an acid-resistant metal, such as gold-plated.
  • the technical problem underlying the invention is to provide a magnetic stirrer with a heating plate which is improved in its functional properties.
  • the magnetic stirrer comprises a housing and a heating plate, which is heated by a heating device on its underside. Below the heating plate, a magnetic drive is provided in the housing, which generates a changing magnetic field which is suitable for setting a stirrer in a vessel standing on the heating plate in a stirring movement.
  • the heating plate includes a metal-ceramic layer composite with a base layer of an aluminum alloy and a ceramic, in particular oxide-ceramic, layer facing the vessel.
  • a layer composite is understood to be a material in which two layers are connected to one another by material bonding. Between the layers, the layer composite has a (very thin) transition zone, in which a concentration gradient of the individual materials, here metal and ceramic, is present.
  • a layer composite according to the invention is present if the one layer (ceramic Layer) by (electrochemical) conversion of the other layer (aluminum alloy) is formed, for example by outgrowth.
  • the layer composite is a produced by coating material in which a coating as a liquid (eg by spraying, painting, enamelling or the like) or solid (eg by rolling or pressing) is applied to the surface of a material.
  • the ceramic layer of the composite layer normally forms a cover layer on top of the heating plate, on which the vessel is standing with the liquid.
  • the base layer is the layer of the heating plate immediately adjacent to the ceramic layer.
  • the heating plate can also have additional layers. Preferably, however, the entire shaped body of the heating plate of the aluminum alloy. Due to the excellent thermal properties of the aluminum alloy, the temperature of the heating plate can be set reliably accurately and almost instantaneously by means of a temperature control. At the same time, the heating plate has a very high scratch resistance and is extremely corrosion resistant. The production is inexpensive.
  • the ceramic layer of the heating plate is very hard and is characterized by a smooth surface. Spalling of the ceramic layer is practically impossible due to the integral structure of the layer composite.
  • the corrosion resistance of the ceramic layer is very good, especially against chloride-containing solutions and in the weakly acidic range. There are no health concerns when contacting food with the hot plate.
  • both materials are non-magnetic, so that the entire layer composite is non-magnetic. This is a prerequisite that the heating plate can be penetrated by the magnetic field generated below the heating plate, without affecting the magnetic field. Only in this way can the stirrer in the vessel on the heating plate be put into a stirring motion.
  • the heating plate is designed such that at least the heating device adjacent parts of the underside of the heating plate are free of the ceramic layer. This promotes optimal heat transfer from the heater to the heating plate. Also hereby a very good heat distribution in the heating plate can be realized; the heating plate heats up very evenly. Thus, their temperature can be regulated very well.
  • the heating plate has the same good characteristics as a heating plate made of pure aluminum or an aluminum alloy with respect to the heat transfer from the heater.
  • the aluminum content of the aluminum alloy of the base layer is at least 95 percent by weight.
  • an aluminum content of at least 97 weight percent, with an aluminum content of at least 99 weight percent has been found to be particularly preferred.
  • a particularly high quality of the ceramic layer can be produced.
  • the layer thickness is also influenced by the aluminum alloy used.
  • the copper content of the aluminum alloy of the base layer is less than 2% by weight, more preferably less than 1.5% by weight. With a higher copper content, a poor quality ceramic layer is formed. In particular, the positive properties of the ceramic layer with respect to scratch resistance and corrosion resistance are largely lost.
  • the layer thickness of the ceramic part of the layer composite is at most 300 micrometers, preferably at most 200 micrometers.
  • a layer thickness of at most 100 micrometers has proven to be particularly preferred. In the context of the invention has been found; that these preferred layer thicknesses are sufficient to a high scratch resistance and to guarantee corrosion resistance of the heating plate.
  • the ceramic layer which has relatively poor thermal properties, is so thin that overall good heat transfer is ensured. However, this thin ceramic layer can only be produced if the base layer has a sufficiently smooth surface.
  • the ceramic part of the layered composite contains alumina (Al 2 O 3 ), which is preferably present in a proportion by weight of at least 95%.
  • the metal of the base layer is therefore also part of the ceramic layer.
  • the ceramic layer can be formed by reaction, in particular oxidation, of the aluminum from the aluminum alloy of the base layer.
  • the ceramic layer has, in particular at a weight fraction of at least 95 percent by weight of aluminum oxide, a very low pore volume.
  • the layer is formed by conversion, ie conversion, from the base layer, it is an integral part of the multilayer heating plate.
  • the ceramic layer is preferably formed on the surface of the heating plate by chemical conversion involving the aluminum of the aluminum alloy of the base layer.
  • the aluminum oxide of the ceramic layer is therefore preferably not applied as a finished ceramic compound, but arises at least partially by reaction of the aluminum metal on the uppermost surface layer with oxygen to Al 2 O 3 . Since the alumina has approximately twice the volume of aluminum, it grows to about 50% of the material of the base layer out.
  • the ceramic layer is formed by electrochemical conversion in a galvanic bath.
  • the base layer is preferably used as the anode.
  • This type of chemical conversion is referred to as hard anodization or anodic hard anodization (hardcoat).
  • hard anodization or anodic hard anodization (hardcoat).
  • an oxidation of the aluminum surface using very high currents of typically 60 amps takes place in a galvanic bath.
  • the resulting during the conversion Reaction heat is quite large and must be dissipated. However, a targeted heating of the surface does not take place.
  • Hard anodization methods are known as such.
  • a composite polymer metal oxide is electrochemically deposited.
  • the electrolyte used for the anodic oxidation contains a conductive polymer.
  • the document also notes the particular problems involved in the anodic oxidation of aluminum. Among other things, it is shown that an alumina layer is formed, which is a two-phase alumina, one of which is thin and non-porous, while the outer oxide layer is relatively thick and porous. Since the outer layer of the anodic layer per se is porous, it is necessary to seal this layer to provide a protective coating. However, the mechanism of the seal is not fully understood according to the document. The document therefore explains not only the possibilities, but also the problems associated with hard ananisation, depending on the application.
  • hard anodization is particularly suitable for the production of magnetic stirrer heating plates.
  • a very good “scattering” of the material can be achieved.
  • “Scattering” is a common name in electroplating technology for the ability to form the desired layer not only on the outer surface, but also, for example, in holes, with as uniform a material thickness as possible.
  • the ceramic layer is formed evenly in blind holes or through holes. Since the layer is formed from the base material, care must be taken only that no sharp edges are formed at the edges of holes or at the edges of the heating plate, which would lead to a rupture of the layer.
  • the ceramic layer can also over the edges addition to the side surfaces and, if desired - are partially formed on the underside of the heating plate.
  • the aluminum alloy is an aluminum wrought alloy.
  • Aluminum wrought alloys are aluminum alloys which are suitable for processing by forming (for example rolling or extrusion). They usually consist of a very high percentage of aluminum with relatively small additions of another metal, wherein in the context of the invention, in particular alloys with at least one of the metals magnesium, manganese, silicon and copper (the latter but as mentioned only in a very small proportion) suitable are.
  • a layer composite of an aluminum wrought alloy and a ceramic (especially oxide-ceramic) cover layer has particular advantages for the heating plate of a magnetic stirrer. According to the inventors, this can be attributed to the fact that the wrought aluminum alloy allows the production of a hotplate with a particularly smooth surface, while voids occur in the use of an aluminum casting alloy which affect the quality of the surface and the ceramic layer. This is especially true when the ceramic layer, as explained, is very thin and especially when made by anodization (anodization).
  • the shaping of at least the base layer, preferably of the entire shaped body, of the heating plate by extrusion can be carried out at room temperature (cold extrusion) or at a higher working temperature (hot extrusion).
  • the alloys or the material are plastically deformed; it flows through predominantly axial or radial material displacement in a press with die and punch.
  • the production of the base layer of the hot plate in the extrusion process leads to a hot plate with an extreme low pore volume. This results in a particularly smooth base layer, which is very well suited for the invention.
  • the ceramic layer can grow out of the base layer, forming a likewise smooth and very hard ceramic layer.
  • the aluminum alloy of the heating plate contains one or more of the metals magnesium, manganese, silicon and copper.
  • the properties of the aluminum alloy can be determined accordingly so that an optimized alloy can be produced as required.
  • the magnetic stirrer 1 from FIG. 1 has a housing 2 which has an operating part 3 on the front side for operation and display. Above the housing 2, the magnetic stirrer 1 has a heating plate 4 with an underlying heat reflector 5. Below the heating plate 4, a heater, not shown here for heating the heating plate is provided.
  • the control panel 3 comprises a display 6, a plurality of control knobs 7 and a rotary knob 8. With the control knobs 7 and the dial 8, the magnetic stirrer can be put into operation, on the other hand, the desired temperature of the heating plate 4 can be adjusted.
  • the heating plate 4 has a surface 9 and a peripheral edge 10. It is spaced from the heat reflector 5.
  • the surface 9 and the peripheral edge 10 are formed as a ceramic layer, which consists of aluminum oxide (Al 2 O 3 ).
  • the alumina is formed from the base layer underlying the ceramic layer 11 by electrochemical conversion.
  • a magnetic drive is provided which generates a changing magnetic field.
  • the magnetic field generated by the magnetic drive passes through the heat reflector 5 and the heating plate 4, so that a magnetic stir bar ("stirring fish") arranged in a vessel on the heating plate 4 is set in rotation.
  • FIG. 2 shows the magnetic stirrer 1 in a side view.
  • the operating part 3 and the rotary control 8 for the operation of the magnetic stirrer 1 is shown.
  • a switch 12 for switching the magnetic stirrer 1 on and off is provided on the lower edge side of the housing 2.
  • fastening sleeves 13, 14 are provided.
  • the fixing sleeves 14 are disposed between the heat reflector 5 and the housing 2; the fastening sleeves 13 between the heat reflector 5 and the heating plate 4.
  • the mounting sleeves 14 are screwed into the housing.
  • the fastening sleeves 13 engage through holes in the heat reflector 5 and are screwed into the mounting sleeves 14. Since the fixing sleeves 14 are widened at the top thereof, the heat reflector 5 rests on and is supported by the fixing sleeves 14.
  • the fastening sleeves 13 are also widened in the upper region; By the Befest Trentsliülsen 13, 14 is embedded on the underside of the heating plate 4 heating device, which may be formed, for example, with heating coils or other electrical resistance heating (eg as thick film heater), via electrical cables with electricity from a in the housing. 2 arranged powered power source. Thus, the leads to the heater are protected from external influences.
  • FIG. 3 shows a sectional view of the magnetic stirrer 1; However, the heat reflector of Figure 1 is not shown for reasons of clarity.
  • the housing 2 comprises a motor 15 and magnet 16, which is coupled via a plurality of coupling members 17 and an axis 18 to the motor 15.
  • the magnet 16 is rotated by the motor 15 so that a rotating magnetic field is generated.
  • the rotating magnetic field passes through the heating plate 4 and causes a magnetic stir bar, not shown, in a (also not shown) vessel on the heating plate 4 in motion.
  • the changing magnetic field can also be generated motionless by electronic control of magnetic coils.
  • On an underside 19 of the heating plate 4, a plurality of pins 20 are provided, which protrude from below into the heating plate 4.
  • the pins 4 pass through the fastening sleeves 13 and store the heating plate 4 inside the housing 2.
  • the heating plate 4 is essentially formed by a molded body 24 produced by extruding aluminum, on the upper side of which the ceramic layer 11 is located. It has on its underside 19 grooves 21 in which heating coils 22 of a heater are fixed. The heating coils 22 are arranged spirally. A circular or meandering arrangement is alternatively possible.
  • the heating plate 4 can be produced by extrusion in one step in the desired shape with the grooves 21 on the bottom 19.
  • the ceramic layer 11 of the heating plate 4 can be seen more clearly than in FIG.
  • the ceramic layer 11 is formed on the surface 9 of the heating plate 4 and on the peripheral edge 10.
  • the entire shaped body 24 of the heating plate 4 consists of an aluminum alloy, ie the base layer 23 is formed by the shaped body 24.
  • the heating plate 4 could consist of more than two layers. This alternative is indicated by dashed lines in FIG. In this case, only the one in Figure 4 by a broken line 25th limited, the ceramic layer 11 adjacent, designated by 23 'sub-layer of the shaped body 24 to be regarded as a base layer in the context of the present invention.
  • the ceramic layer 11 is formed by electrochemical conversion to form a metal-ceramic layer composite of the base layer 23 of the heating plate 4. It has a thickness of, for example, 70 microns. In Figure 4, the thickness of the ceramic layer 11 is exaggerated.
  • the ceramic layer 11 may also be partially formed on the underside 19 of the heating plate 4. However, the grooves 21 are not provided with the ceramic layer 11. As a result, the aluminum alloy of the base layer 23 rests directly against the heating coils 22, and optimum heating of the base layer 23 of the heating plate 4 is ensured.

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  • Cookers (AREA)
  • Resistance Heating (AREA)
EP07001957A 2006-02-04 2007-01-30 Agitateur magnétique doté d'une plaque chauffante Revoked EP1816900B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006005155A DE102006005155B3 (de) 2006-02-04 2006-02-04 Magnetrührer mit Heizplatte

Publications (2)

Publication Number Publication Date
EP1816900A1 true EP1816900A1 (fr) 2007-08-08
EP1816900B1 EP1816900B1 (fr) 2010-04-14

Family

ID=37944072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07001957A Revoked EP1816900B1 (fr) 2006-02-04 2007-01-30 Agitateur magnétique doté d'une plaque chauffante

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EP (1) EP1816900B1 (fr)
DE (1) DE102006005155B3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102685938A (zh) * 2012-05-05 2012-09-19 江苏正基仪器有限公司 耐磨防腐绝缘加热器托盘
DE202013101177U1 (de) 2013-03-19 2013-03-27 Lab Logistics Group Gmbh Aufsatz für Magnetheizrührer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014111838A1 (de) * 2014-08-19 2016-02-25 Hans Heidolph Gmbh & Co. Kg Frontblende für ein Laborgerät
DE102016108749A1 (de) 2016-05-11 2017-11-16 Hans Heidolph GmbH Magnetrührer
DE202017004815U1 (de) 2017-09-15 2017-11-06 Heidolph Instruments GmbH & Co. KG Laborgerät mit einstellbaren Betriebsparametern zum Steuern einer Laborgerätfunktion
DE202021100315U1 (de) 2021-01-22 2022-04-25 Hans Heidolph GmbH Probenaufnahmeelement für ein Laborgerät

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2144372A1 (de) * 1971-09-04 1973-03-15 Dirk Sijsling Magnetruehrmaschine
DE2215798A1 (de) * 1972-03-30 1973-10-11 Int Labor Apparate Gmbh Magnetruehrgeraet
DE3904661A1 (de) * 1989-02-16 1990-08-23 Licentia Gmbh Verfahren zur herstellung einer oxidhaltigen schicht
DE20107769U1 (de) * 2001-05-08 2001-07-05 Ika Werke Gmbh & Co Kg Magnetrührer mit einer beheizbaren Aufstellplatte

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5980723A (en) * 1997-08-27 1999-11-09 Jude Runge-Marchese Electrochemical deposition of a composite polymer metal oxide
DE20106112U1 (de) * 2001-04-06 2001-10-04 Cww Vermoegensverwaltungs Gmbh Vorrichtung zur Verteilung der Wärmezufuhr eines Heizelementes an ein chemisches oder physikalisches Reaktorgefäß
DE20201349U1 (de) * 2002-01-30 2002-04-25 Ika Werke Gmbh & Co Kg Magnetrührer mit einer beheizbaren Aufstellplatte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2144372A1 (de) * 1971-09-04 1973-03-15 Dirk Sijsling Magnetruehrmaschine
DE2215798A1 (de) * 1972-03-30 1973-10-11 Int Labor Apparate Gmbh Magnetruehrgeraet
DE3904661A1 (de) * 1989-02-16 1990-08-23 Licentia Gmbh Verfahren zur herstellung einer oxidhaltigen schicht
DE20107769U1 (de) * 2001-05-08 2001-07-05 Ika Werke Gmbh & Co Kg Magnetrührer mit einer beheizbaren Aufstellplatte

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102685938A (zh) * 2012-05-05 2012-09-19 江苏正基仪器有限公司 耐磨防腐绝缘加热器托盘
DE202013101177U1 (de) 2013-03-19 2013-03-27 Lab Logistics Group Gmbh Aufsatz für Magnetheizrührer

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Publication number Publication date
DE102006005155B3 (de) 2007-08-23
EP1816900B1 (fr) 2010-04-14

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