DE102006038370A1 - Coil carrier for inductors - Google Patents

Abstract

The invention relates to a coil carrier (110) for an inductor, in particular for an induction coil (112) for an induction hob, characterized in that the coil carrier (110) consists of a temperature-resistant mass comprising an inorganic, hydraulically acting binder and / or polymer concrete, ferrite powder and a fluid, in particular water, is formed. The invention further relates to a method for producing a bobbin, an induction heating device comprising a bobbin and an induction cooking.

Description

Field of application and status of the technique

The The invention relates to a coil carrier for an inductor, in particular for one Induction cooker, according to the preamble of claim 1, and a method for producing the same. The invention further relates to an induction heater for an induction hob and an induction cooking station comprising an induction heater.

Task and solution

It is well known, inductors or induction coils for an induction hob on a coil carrier to arrange. The inductor or the induction coil is usually powered by a generator. Under the inductor or induction coil is on the coil carrier a magnetic circuit can be provided, by which the of Magnetic field generated on the inductor or the induction coil directed at heating vessels shall be.

For this purpose it is for example from the EP 1 560 462 A2 known to form on the bottom of a bobbin receiving spaces for magnetic return means. The magnetic return means are preferably ferrite rods. Partly ferrites are also fixed only with adhesive film.

The bobbin is usually made of plastic. Due to the high temperatures that can be generated at the inductor, a plastic is to use, which has a high temperature resistance. In addition, it is from the EP 0 713 351 A1 known to form a bobbin with receiving spaces of a cement mortar with magnesium powder.

From the EP 0 713 351 A1 It is also known to produce the bobbin from plastic, in which a ferrite powder is stored. However, such plastic carriers are extremely difficult to manufacture.

Task and solution

It Object of the present invention, a bobbin for a To create inductor, which is inexpensive and easy to produce is, allows a good concentration of a generated magnetic field and has a high temperature resistance. It is still the task of present invention to provide a method for producing the same. The invention has further set itself the task of an induction heater and an induction cooking station comprising a coil carrier according to the invention.

Is solved This object is achieved by a coil carrier having the features of the claim 1, a method having the features of claim 8, an induction heater with the features of claim 16 and an induction cooking with the features of claim 23. Advantageous and preferred Embodiments of the invention are subject of the further claims and will be closer in the following explained. The wording of the claims becomes by express Reference made to the content of the description. Some of the following, but not exhaustive enumerated Features and properties apply to both the coil carrier as also on the process as well as induction heating and induction cooking to. They are sometimes described only once, but are independent for the individual inventive aspects.

According to the invention is a coil carrier for one Inductor, especially for an induction coil for an induction hob made of a mixture with an inorganic, hydraulically acting binder and / or polymer concrete and ferrite powder educated. The mixture is made by adding a fluid, in particular of water, to a malleable mass. By the amount of stored Leaves ferrite powder there is a permeability of the bobbin set almost arbitrarily within a wide spectrum. By the ferrite powder is a better guide on an induction coil generated field possible as with conventional Ferritsstäben, because the permeable material is flat distributable in the bobbin is. In addition, the cost of ferrite powder are much lower as for Ferrite.

By an inorganic, hydraulically acting binder and / or a Polymer concrete is a simple and inexpensive manufacture of a bobbin, for example with the addition of water by pouring, possible. After the curing time is the coil carrier in a suitable form, in particular as a flat disc, before. The inorganic binder and / or the polymer concrete have thereby a high heat resistance on. The properties of the polymer concrete are advantageous through an aggregate embossed, so that difficulties, which in the incorporation of ferrite powder can occur in plastic, be avoided.

In a further development of the invention, the mixture comprises an aggregate. The aggregate, also known as concrete aggregate, is a mixture of broken or unbroken, equal or different sized grains of natural or artificial materials, in particular mineral substances. The choice of aggregate certain characteristics of the bobbin, such as temperature resistance or strength can be fixed.

In An advantageous embodiment of the invention is the binder Cement, alkali silicate, fly ash, slag, gypsum and / or lime. Such inorganic binders are available inexpensively as a raw material. By the addition of water or other fluid arises a good mouldable mass, in which the ferrite powder is einbindbar. To hardening the mass is a temperature, water and space-resistant bobbin ago.

In Development of the invention, the mixture comprises a filler, in particular vermiculite, quartz sand and / or alumina. By Addition of fillers is the permeability and / or a thermal conductivity of the bobbin further suitably adjustable. In particular, by increasing the thermal conductivity is it possible a good heat dissipation from one on the spool carrier to achieve arranged induction coil. By discharging the Heat on one under the coil carrier arranged support plate can thus reduce self-heating of the induction coil become. The support plate is preferably made of a non-magnetizable material.

In Further development of the invention, the mixture is in a shell or a receiving plate pressed and / or poured. The bobbin can after curing remain in the shell or the receiving plate. This shell or This mounting plate makes a support plate superfluous.

On the coil carrier is an inductor, in particular an induction coil, attachable. The inductor is in one embodiment while the curing time on the bobbin attached. The inductor, for example an induction coil, is so sure on the coil carrier fixable. Alternatively or in addition can the inductor after curing on the bobbin be fixed. At the coil carrier is for this purpose in one embodiment one or more Grooves formed. The induction coil is in one embodiment a copper wrap.

In Further development of the invention, an inductor is cast into the coil carrier. The inductor can be securely fixed on the coil carrier.

In another embodiment becomes the coil carrier formed by a stamp, wherein the inductor, in particular the Induction coil, is pressed by the punch in the bobbin. The coil carrier is doing great Accuracy cost-effective produced, the induction coil in one step the coil carrier securely fixable.

In Further development of the invention, the induction coil has a strip conductor made of aluminum, with the surface of the aluminum strip conductor anodized. By such anodization is a very advantageous and achieved sufficient electrical insulation. An Eloxation is in mass production in the pass possible. It is very temperature resistant and technically very well tested in aluminum production and / or -processing.

The Invention is further solved by an induction heater for an induction hob comprising an induction coil and a temperature-resistant mixture shaped coil carrier. Such an induction heater is particularly inexpensive to produce. Due to the good temperature resistance is no additional Temperature insulation between the windings of the inductor required.

In Further development of the induction heater is the inductor, in particular the induction coil, pressed into the coil carrier. The induction coil is doing this in a simple way the production of the bobbin carrier fixable on this.

In Further development of the induction heater, the inductor, in particular the induction coil, a strip conductor made of aluminum on, with the surface of the aluminum strip conductor is anodized. The band leader is in one embodiment before deforming into the final one Shape of induction coil anodized. In another embodiment takes place the anodization after deformation. This depends mainly on whether and in what way such deformation takes place. The anodized aluminum strip conductor is directly with the coil carrier without additional Isolation connectable.

In advantageous development of the induction heater is the band leader edgewise. The band leader is in an advantageous Design at least twice or even at least three times high as thick. this makes possible a relatively compact arrangement of several turns of the induction coil, because of their big ones Cross sectional area can lead by the upright standing training corresponding currents. Especially Advantageously, the band conductor has a rectangular cross-section on, in particular an upright rectangular cross-section.

In a further development of the induction heater, it is provided that the induction coil consists of a single piece, in particular a single long ribbon conductor. The strip conductor runs in an advantageous embodiment spirally. Next each other running turns of the strip conductor can thereby have a certain distance from each other, which is at least as large as the strip conductor itself is thick. Thus, a flat expansion of the induction coil is achieved, which can correspond approximately to the size of the induction cooking. Such a distance of the strip conductor turns to each other, of course, in addition to the anodization, a means to avoid a short circuit between the turns. In particular, this local overheating can be avoided. This has a particularly advantageous effect by the combination with the coil carrier with embedded ferrite powder.

A Anodization is advantageously applied and / or is so formed that it should withstand temperatures of at least 700 ° C. Especially Advantageously, it is even over 1000 ° C or even over 1500 ° C temperature resistant. So can even for the case of unwanted local overheating an electrical insulation can be ensured.

The Task will be solved further by an induction cooking, which such a coil carrier and / or having such an induction heater. Advantageously an induction hob then several induction cookers on, for example four induction hobs.

In an embodiment is after the manufacture of the inductor a applied hydraulically bound mixture containing the inductor isolated upwards. This mixture can be designed so that they are thermally very well insulated and thus the glass pane of actual inductor thermally decoupled. The additionally applied Isolation mixture can have a defined conductivity and with the Earth are connected.

These and other features go out the claims also from the description and the drawings, wherein the individual features each for alone or in the form of subcombinations an embodiment of the Invention and other fields be realized and advantageous also for protectable versions can represent for the protection is claimed here. The subdivision of the application into individual Sections and intermediate headings restrict the not in its generality among these statements.

Brief description of the drawings

One embodiment the invention is shown schematically in the drawings and will be closer in the following explained. In the drawings show:

1 FIG. 2 is a sectional view of an induction heater including an induction coil formed as a copper coil. FIG.

2 FIG. 3 is a sectional view of an induction heater including an induction coil formed of an aluminum ribbon conductor and FIG

3 : A plan view of the induction heater according to 2 ,

Detailed description the drawings

1 schematically shows a sectional view of an induction heater 1 comprising one as a copper wrap 12 shaped induction coil, which on a coil carrier according to the invention 10 is arranged. The coil carrier 10 is formed from a composition comprising an inorganic, hydraulically acting binder, in particular cement, alkali metal silicate and / or lime, ferrite powder and a fluid, in particular water. In one embodiment, an additional filler such as vermiculite, quartz sand or alumina is incorporated into the mass. From the mass, a flat disc is formed in the illustrated embodiment, which is mechanically stable. The illustrated coil carrier 10 is with grooves 11 formed, in which the copper wrap 12 is used. The copper wrap 12 is not shown by fasteners on the bobbin 10 fixed. In one embodiment, a coating is provided on the groove, through which the introduction of electrical current in the coil carrier 10 is prevented. Alternatively and / or additionally, the copper wrap 12 have an electrically insulated surface.

The induction heater 1 is in the illustrated embodiment on a support plate 2 arranged, which is preferably made of a non-magnetizable material, such as aluminum, formed. At the top of the induction heater 1 is a workspace 3 arranged. On the work surface 3 an unillustrated vessel can be arranged. In the illustrated embodiment, between the induction heater 1 and the work surface 3 a thermally insulating layer 4 arranged.

A cooking point can be equipped with any number of induction devices 1 be educated. Usually there are four induction devices 1 provided at a cooking area.

The ferrite powder allows a high permeability of the bobbin 10 so that one through the copper wrap 12 generated magnetic field on a not shown vessel, which on the work surface 3 is arranged, can be directed.

The coil carrier 10 preferably has a good thermal conductivity, so that the copper coil 12 generated heat to the support plate 2 is dissipated. This can cause overheating of the copper coil 12 due to self-heating can be prevented.

2 schematically shows a sectional view of an induction device 100 comprising a coil carrier 110 and one of an aluminum tape conductor 112 molded induction coil. The induction heater 100 is there like in 1 on a support plate 2 arranged. Above the induction heater 100 is also a work surface in the illustrated embodiment 3 and a thermally insulating layer 4 arranged. Through the layer 4 becomes the work surface 3 from the induction heater 100 thermally insulated. In other embodiments, such a layer is 4 waived.

In one embodiment, the surface of the aluminum ribbon conductor is 112 anodized. The illustrated aluminum strip conductor 112 has a rectangular cross-section. Preferably, the aluminum strip conductor - as shown - upright. The illustrated aluminum strip conductor 112 is about three times as thick as thick. As a result, a large cross-sectional area is possible in a compact arrangement.

As in 2 recognizable, has the bobbin shown 110 projections 111 into which the aluminum tape carrier 112 is pressed. Likewise, the band conductor for fixation can also be introduced directly into the mold. In an advantageous embodiment, a composition comprising water, ferrite powder and an inorganic, hydraulically acting binder and / or polymer concrete is filled into a mold. Cement, alkali metal silicate or lime is preferably used as the inorganic, hydraulically acting binder. On the mass filled into a mold, a stamp is applied from above, which gives the mass the desired shape and at the same time the aluminum strip conductor 112 einpresst. After curing, the mass is the aluminum strip conductor 112 thus on the bobbin 110 fixed and the induction heater 100 completed for use in an induction cooker. Such an induction heater 100 is easy to produce by just a few steps. Such an induction heater 100 further has an advantageous heat resistance.

3 schematically shows a plan view of the induction heater 100 according to 2 , As in 3 Recognizable, the induction coil is made of a long aluminum strip conductor 112 shaped, which runs in a spiral, wherein adjacent turns of the strip conductor have a distance A from each other. The distance A is significantly greater than the thickness of the aluminum strip conductor in the schematically illustrated embodiment 112 , In other embodiments, the distance A is less or greater selectable, wherein preferably the distance of at least the thickness of the aluminum strip conductor 112 equivalent.

The aluminum band conductor 112 has a connection area 5 on. About the connection area 5 is the aluminum band conductor 112 connectable to a generator, not shown. The associated end of the anodized aluminum tape conductor 112 has a contact surface that is free of anodization.

Claims (23)

Coil carrier for an inductor, in particular for an induction coil for an induction cooking point, characterized in that the coil carrier ( 10 . 110 ) is formed of a temperature-resistant mass, with an inorganic, hydraulically acting binder and / or polymer concrete and ferrite powder. coil carrier according to claim 1, characterized in that the mixture is a aggregate having. coil carrier according to claim 1 or 2, characterized in that the binder Cement, alkali silicate, fly ash, slag, gypsum and / or lime. coil carrier according to one of the claims 1 to 3, characterized in that the mixture contains a filler, especially vermiculite, quartz sand and / or alumina. coil carrier according to one of the claims 1 to 4, characterized in that the mixture in a shell or a receiving plate is pressed or poured, in particular a shell or a receiving plate made of non-magnetizable Material, preferably aluminum. Coil carrier according to one of claims 1 to 5, characterized in that an inductor, in particular an induction coil ( 112 ), in the coil carrier ( 100 ) is poured and / or pressed. Coil carrier according to claim 6, characterized in that the induction coil is a strip conductor ( 112 ) made of aluminum, wherein the surface of the aluminum strip conductor ( 112 ) is anodized. Method for producing a coil carrier ( 10 . 110 ) for an inductor, in particular for an inductor for an induction cooking, characterized in that a mass with a anorgani rule, hydraulically acting binder and ferrite powder with the addition of a fluid, in particular with the addition of water, is provided and the coil carrier ( 10 . 110 ) is formed from the mass. Method according to claim 8, characterized in that that the mass is an aggregate is added. Method according to claim 8 or 9, characterized in that at least one of the following group is selected as binder: Cement, alkali silicate, fly ash, slag, gypsum, lime. Method according to one of claims 8 to 10, characterized that the mass is a filler, in particular vermiculite, quartz sand and / or alumina becomes. Method according to one of claims 8 to 11, characterized that the mass in a shell or a receiving plate, in particular a Shell or a receiving plate made of non-magnetisable material, preferably aluminum, pressed or cast. Method according to one of claims 8 to 12, characterized in that the coil carrier ( 10 . 110 ) is formed by a punch. Method according to one of claims 8 to 12, characterized in that an inductor, in particular an induction coil ( 12 . 112 ), in the coil carrier ( 10 . 110 ) is poured and / or pressed. Method according to claim 14, characterized in that the coil carrier ( 110 ) is formed by a punch, wherein the inductor, in particular the induction coil ( 112 ), is pressed by the punch. Induction heating device with an inductor, in particular an induction coil ( 12 . 112 ), and a coil carrier ( 10 . 110 ) according to one of claims 1 to 7. Induction heater according to claim 16, characterized in that the inductor, in particular the induction coil ( 112 ), in the coil carrier ( 110 ) is pressed and / or poured. Induction heater according to claim 16 or 17, characterized in that the inductor, in particular the induction coil, a band conductor ( 112 ) made of aluminum, wherein the surface of the aluminum strip conductor ( 112 ) is anodized. Induction heater according to claim 18, characterized in that the aluminum strip conductor ( 112 ) is upright, wherein it is preferably at least twice, in particular at least three times as thick as thick. Induction heater according to claim 18 or 19, characterized in that the aluminum strip conductor ( 112 ) has a rectangular cross-section. Induction heater according to one of claims 16 to 20, characterized in that the induction coil of a single Piece, in particular a long strip conductor, consists and spirally runs, wherein especially adjacent turns of the strip conductor have a certain distance (A) to each other, preferably at least of the thickness of the strip conductor itself. Induction heater according to one of claims 18 to 21, characterized in that the anodization is temperature resistant to about Temperatures of 700 ° C, preferably over 1500 ° C. Induction cooker with at least one induction heating device ( 1 . 100 ) according to any one of claims 16 to 22.