JP2004179082A - Auxiliary heat-transfer tool for induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary heat-transfer tool capable of electromagnetically heating irrespective of a material and a shape of a bottom face. <P>SOLUTION: The auxiliary heat-transfer tool 3 for an electromagnetic cooking device is arranged between an electromagnetic cooking device 6 and a pot 4 containing foodstuff. The auxiliary heat-transfer tool 3 for the electromagnetic cooking device consists of a plate-like heating member 1 radiating heat by the action of electromagnetic induction of the electromagnetic cooking device 6 and a heat-transferring powder particle body 2 arranged on the heating member 1 adapted to a shape of the pot and having characteristics of transferring heat generated at the heating member 1 to the pot 4 side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an auxiliary tool for heating a pot or a container such as an aluminum or copper or an earthen pot which cannot be used in an electromagnetic cooker (IH) with the electromagnetic cooker.
[0002]
[Prior art]
Induction cookers are often used because they do not emit flames or combustion gases when heated, have little splashing of oil smoke, are easy to adjust the heat, are clean, and have high safety. It has come to be.
[0003]
As is well known, in an electromagnetic cooker, a heating coil is arranged below the portion of the top plate on which the pot is placed, and an eddy current is generated at the bottom of the pot by the lines of magnetic force generated by the heating coil, thereby heating the pot itself to produce the food. Is cooked by heating, so that the pot must have a ferromagnetic material that generates an eddy current by receiving magnetic lines of force formed on the bottom or the whole pot.
[0004]
As a metal suitable for this electromagnetic cooking pot, there has been proposed a metal in which an iron-based material is pressure-bonded to an outer bottom surface of an aluminum container body (for example, see Patent Document 1).
[0005]
Similarly, a pot in which a magnetic metal material is incorporated in the bottom of a non-magnetic metal has been proposed (for example, see Patent Document 2).
[0006]
Furthermore, there has been proposed a device in which a carbon plate is fixed to the bottom of an earthen pot so that heating can be performed by an electromagnetic cooker (for example, see Patent Document 3).
[0007]
In addition, many pots for electromagnetic cookers have been proposed in which an aluminum material is used for an inexpensive and easy-to-process container body and a material made of a magnetic material is used for a bottom portion.
[0008]
[Patent Document 1]
JP 2002-282128 A [Patent Document 2]
Japanese Patent Application Laid-Open No. 2002-325681 [Patent Document 3]
Japanese Patent Application Laid-Open No. 2002-238938
[Problems to be solved by the invention]
In the invention described in Patent Document 1, an iron-based member is joined to an outer surface of a bottom portion of an aluminum pot main body. The invention described in Patent Document 2 has a magnetic metal material built in the bottom of the pan. Further, the invention described in Patent Document 3 is one in which a carbon plate is fixed to the bottom of a clay pot.
[0010]
As mentioned above, a pot that uses an electromagnetic cooker must be newly purchased and used with a material that always provides a material that induces eddy current by electromagnetic induction in the part facing the heating coil of this electromagnetic cooker. There is a problem that it does not.
[0011]
In particular, the copper pot with good heat conductivity used in the recently sold IH jar rice cooker has a five-layer structure of copper, stainless steel, aluminum, bincho charcoal-processed layer, and fluororesin layer from the outside. It is expensive and expensive.
[0012]
As the pot for the electromagnetic cooker, an IH pot is optimal, but iron, casting, and iron enamel can also be used. However, the shape of the bottom of the pot is also limited.
[0013]
In other words, those with a flat bottom are limited, those with a large bottom with a warp of 1 mm or more inward, those with a large bulge outward like a wok, and those with a ring-shaped edge on the bottom are electromagnetic force. Cannot be used because the influence of Furthermore, there is a problem that aluminum, clay pots and heat-resistant glass cannot be used because electromagnetic force does not act at all. In addition, fish grill nets, mochi grill nets, aluminum foil containers, and the like cannot be practically used for the electromagnetic cooker.
[0014]
On the other hand, housewives at home always use aluminum pots, iron woks and the like, and also use earthen pots for seasonal cooking. Many of these are made of aluminum because they are inexpensive, have thermal conductivity suitable for cooking, are more accustomed to handling, and are more resistant to impact. These pots and the like are used daily by housewives, so they naturally learn the types and amounts of ingredients and the types and amounts of seasonings for cooking.
[0015]
Recently, kitchen appliances such as dishwashers, microwave ovens, and electromagnetic cookers have been remarkably improved, and new kitchen utensils such as pots have been replaced in response to such improvements, but this is extremely uneconomical. In addition, it is necessary to learn a new cooking technique different from the above. Further, in an apartment house such as an apartment, it is necessary to purchase a new pot or the like in accordance with the electromagnetic cooker. However, there is actually a big problem that there is no place for placing the pot.
[0016]
Accordingly, the present invention solves these problems by using a non-magnetic pot or container that cannot be used in an electromagnetic cooker, such as an aluminum pot or an earthen pot that has already been used, and a shape like a wok. It is an object of the present invention to provide an auxiliary heating device that can easily use containers and pots that are not suitable for the above.
[0017]
[Means for Solving the Problems]
The electromagnetic cooker auxiliary tool according to the present invention for achieving the above object is configured as follows.
[0018]
1) A heat transfer auxiliary tool disposed between an electromagnetic cooker and a food container containing food, the heat transfer auxiliary tool being a flat plate that generates heat by receiving an electromagnetic induction effect of the electromagnetic cooker. And a powdery and / or granular material disposed on the heating portion and adapted to adapt to the shape of the food container and transfer the heat of the heating portion to the food container side.
[0019]
2) The heat generating portion is in the form of a container made of a ferromagnetic material, and the powdery material is a ferromagnetic material such as iron sand.
[0020]
3) The heating section is characterized in that a ceramic layer is provided on a surface for receiving the powder and granules.
[0021]
4) The ceramic layer provided on the surface where the heat generating portion receives the powdery and granular materials includes a first ceramic layer having a peak of a first radiation spectrum on the surface of the heat generating portion, and a ceramic layer having a second radiation spectrum on the first ceramic layer. A second ceramic layer having a peak is formed in multiple layers, and the temperature of the peak of the first radiation spectrum is higher than the temperature of the peak of the second radiation spectrum.
[0022]
5) The first ceramic layer is made of titanium oxide, and the second ceramic layer is made of aluminum oxide.
[0023]
6) The powdery or granular material is made of a good heat conductor, and is characterized in that it is a metal sphere, a wire, or a metal particle obtained by cutting a metal plate, which itself generates heat by receiving an electromagnetic induction action.
[0024]
7) The granular material is characterized in that it is in the form of small spheres and small pieces made of a good heat conductor made of a material that does not generate heat by itself due to electromagnetic induction.
[0025]
8) The powder or granule is housed in a bag or a flexible container.
[0026]
According to the present invention, a plate-shaped heating portion is provided on a cooking surface of an electromagnetic cooker, and a layer of granular material is further formed on the heating portion, and heat is transferred to the bottom of a pot or a container via the granular material. The layer of the powder and granules forms a heat transfer layer according to the shape of the bottom of a pot or a container so that electromagnetic cooking can be performed.
[0027]
By using the electromagnetic cooking aid according to the present invention, it is possible to use it for cooking without considering the material and shape of the pan, and to grill using a grill net which was conventionally considered impossible. It is also possible to do.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0029]
FIG. 1 is a cross-sectional view showing a combined state of a heat transfer auxiliary tool for electromagnetic cooking and a pot (such as a wok). ) Accommodates the heat-conductive powdery granules 2 to constitute the heat transfer auxiliary tool 3 for electromagnetic cooking according to the present invention.
[0030]
First, a method of using the electromagnetic cooking aid 3 according to the present invention will be described.
[0031]
The auxiliary tool 3 according to the present invention is arranged above the heating coil 7 arranged on the lower surface of the top plate 6 of the electromagnetic cooker. Then, the pot 4 (or container) containing the food 9 is placed on the heat-conductive powder 2 in the heat generating member 1, and the bottom surface 4 a is pushed into the granular material 2 so that the space between the bottom surface 4 a and the granular material 2 is formed. And stabilize and prepare for cooking.
[0032]
As shown in FIG. 1, since the pot 4 is placed on the granular material 2, the layer of the granular material 2 is depressed according to the shape of the pot bottom 4 a, and can be adapted to the pot bottom 4 a of any shape. And can be brought into contact over a fairly large area.
[0033]
Next, when a voltage of a predetermined frequency is supplied to the heating coil 7 and the generated electromagnetic force is applied to the heating member 1, an eddy current is generated at a bottom 1 a of the heating member 1 facing the heating coil 7, thereby generating heat. The member 1 generates heat.
[0034]
Then, the heat generated by the eddy current generated in the heat generating member 1 heats the heat conductive granular material 2 accommodated therein, and the heat can heat the pot 4 to boil the food material 9.
[0035]
The heat-generating member 1 uses a material that generates an eddy current efficiently by receiving the electromagnetic force of the heating coil 7 of the electromagnetic cooker and generates heat, that is, a ferromagnetic material for at least the bottom portion 1a (heat-generating portion). This constitutes the heat source of the heat transfer aid 3.
[0036]
The heat-generating member 1 is formed in a pot shape using a thin iron plate or a composite metal plate formed by pressing and laminating a plate made of a ferromagnetic material, for example, to accommodate the heat-conductive granular material 2 as described above. It is shaped like a tray or container.
[0037]
As shown in FIG. 2, a first ceramic layer C1 and a second ceramic layer C2, and a ceramic layer added separately as required, are formed on at least the bottom portion 1a of the heat generating member 1 by plasma spraying. I have.
[0038]
The first ceramic layer C1 (in this embodiment, titanium oxide that efficiently emits far infrared rays) is used, and the second ceramic layer C2 (in this embodiment, far infrared rays are efficiently emitted). Is as follows.
[0039]
FIG. 3 is a graph showing the emission spectrum of ceramics, in which the vertical axis represents the amount of radiation (4.E + 00, 1.E + 07, 2.E + 07, 3.E + 07... W / m ² ), and the horizontal axis represents the wavelength ( 25, 15.6, 11.3, 8.9... Μm), and measured blackbody radiation at a measurement temperature of 120 ° C.
[0040]
Curve a: Blackbody releasing ability, Curve b: 100% aluminum oxide (alumina), Curve c: Mixture of 97% aluminum oxide + 3% titanium oxide, Curve d: 100% titanium oxide, and Curve e: Aluminum oxide A mixture of 87% + 13% titanium oxide sprayed with a plasma apparatus is shown.
[0041]
Looking at the peak values of both curves of the aluminum oxide 100% of the curve b and the titanium oxide 100% of the curve d, the titanium oxide is 8.0 μm, whereas the aluminum oxide is 10.0 μm.
[0042]
Accordingly, it can be seen that titanium oxide has a peak value of the radiation intensity at a high temperature, and aluminum oxide has a peak value of the radiation intensity at a low temperature than titanium oxide. This means that the radiant intensity varies depending on the heating temperature.
[0043]
The present inventor has studied the “amount and direction of movement of heat” using the difference in the radiant intensity, and has a wavelength at the peak value of the radiant intensity on a surface that receives high-temperature radiant heat with respect to the object to be heated. It has been found that by disposing the ceramic layer C1 having a short length and providing the ceramic layer C2 having a long wavelength in the direction in which the received radiant heat is moved, the transfer amount of thermal energy is greatly increased.
[0044]
Details of the principle of this heat transfer are described in Japanese Patent Application No. 2002-352007 (see the application filed on November 16, 2001).
[0045]
The present inventors describe a case where the ceramic layers C1 and C2 are formed on the heat-generating member 1 which is the object to be heated based on the above knowledge. As shown in FIG. 2, the present inventors receive heat of Q from the lower surface f1 of the heat-generating member 1. When the inside of the heat generating member 1 moves by heat conduction and is further released from the upper surface f2, a ceramic layer is formed on the upper surface f2 in consideration of the fact that the lower surface is hot and the upper surface is cooler. However, a titanium oxide layer C1 having a peak value at a high temperature is arranged in a lower layer, and an aluminum oxide C2 having a peak value at a low temperature is arranged on a heat radiation side of an upper layer to form a laminated structure. For normal heat transfer, two ceramic layers are sufficient for controlling the heat transfer, but three ceramic layers may be used.
[0046]
By forming the double ceramic layers C1 / C2 on the heat radiation side of the heat generating member 1, the heat transfer amount of about 25 to 35% can be reduced as compared with the case where a heat generating member without the ceramic layer is used. It has been experimentally found to increase.
[0047]
As described above, the ceramic layer uses titanium oxide on the high-temperature side and aluminum oxide on the low-temperature side, and these ceramics are easily available, inexpensive, and their properties are well understood. Because. Therefore, when other ceramics are used, the selection can be made in the same manner as described above.
[0048]
When it is desired to obtain a ceramic layer having an intermediate value of the radiation intensity of the two types of ceramic layers C1 and C2, a blending method may be employed. Specifically, it is possible to obtain a product having desired characteristics by increasing the addition amount of titanium oxide to 5, 10, 15, 20, 25, and 30% based on aluminum oxide. .
[0049]
Curve c in FIG. 3 shows the case where aluminum oxide is used as a base material and titanium oxide is mixed in 3%, and curve e shows the case where aluminum oxide is used as a base material and titanium oxide is mixed in 13%. .
[0050]
Next, the heat conductive granular material 2 has a spherical shape as shown in FIG. 4A, a short columnar shape as shown in FIG. 4B, a dice shape as shown in FIG. As shown in D), what is easy to manufacture, such as a scale-shaped thing, and what can be filled into the accommodation part of the heat generating member 1 with high density should just be adopted. These materials and dimensions may be determined by calculating the amount of heat transfer.
[0051]
As a general material, a ferromagnetic material such as iron sand or iron powder is preferably used to generate heat. However, in consideration of heat transfer, it is also possible to use metal powders such as copper powder and aluminum powder, and it is also possible to use nonmetals having excellent heat conductivity.
[0052]
Further, in order to utilize the radiation characteristics of the ceramic layer as described above, it is also possible to form a ceramic layer on the surface of the heat conductive granular material 2 and radiate heat therefrom.
[0053]
Further, a heat conductive powder made of one kind of material is used for the surface (upper surface) of the housing portion of the heat generating member 1. In some cases, the material, the particle size, and the mixing amount are taken into consideration in consideration of the filling rate and the heat conductivity. It is also possible to use it in the form of a blend in consideration of the above.
[0054]
For example, in the case where a powdery or granular material 2 such as iron sand is accommodated in a tray-shaped heat generating member 1, the iron sand easily adheres to the bottom surface of the pot 4. To avoid this, as shown in FIG. The heat-conductive powder 2 is put into the inside of it, and it is put into the tray-shaped heat-generating member 1 as a cushion, and is used while being deformed according to the shape of the pan 4, thereby improving the efficiency. The pan 4 can be electromagnetically heated.
[0055]
FIG. 6 shows another heat generating member 1A, in which a bottom plate 12 made of an iron plate is provided on a frame 13 made of a ceramic so as to be easily handled. Reference numeral 13 denotes a partition such as a soft wire mesh, which separates the upper-layer powder particles 2a and the lower-layer powder particles 2 so as to transfer heat in accordance with the cooking temperature.
(Example)
An iron plate having a thickness of 5 mm is used, and a tray-shaped heat-generating member 1 having a diameter of 25 cm is made of a material, and two ceramic layers made of titanium oxide and aluminum oxide are provided on the upper surface thereof by plasma spraying. Was configured. Then, iron sand was filled to a thickness of 20 mm as the heat conductive powder 2 inside the heat generating member 1.
[0056]
When the heat-generating member 1 containing the iron sand was placed on a heating part of a commercially available electromagnetic cooker having a power consumption of 1300 W and heated, the iron sand was heated to 180 ° C. in a short time. The temperature of the top plate at that time was 240 ° C., and it was confirmed that heat was generated to a temperature required for cooking.
[0057]
Then, water was poured into an aluminum pan whose bottom surface had swelled, and this was placed on the iron sand and the water was boiled.Heating comparable to that when boiling water directly with an electromagnetic cooker was performed. I knew I could do it.
[0058]
Although the ceramic layer is formed in two layers on the inner surface of the heat generating member 1 according to the present invention, the heat transfer property is considerably superior to a simple basin-shaped heat generating member made of an iron plate having no ceramic layer. I knew it was.
[0059]
【The invention's effect】
The heat transfer auxiliary tool for an electromagnetic cooker according to the present invention is a heat transfer auxiliary tool disposed between an electromagnetic cooker and a food container containing food, wherein the heat transfer auxiliary tool is the electromagnetic cooker. A plate-like heat-generating portion that generates heat by the electromagnetic induction action of the particles, and powder particles that are arranged on the heat-generating portion and have a characteristic of being adapted to the shape of the food container and of transferring the heat of the heat-generating portion to the food container side. Consisting of body and body.
[0060]
Therefore, special shapes such as those made of aluminum, ceramics, and heat-resistant glass, which cannot be used for electromagnetic cooking devices, and those with a concave bottom surface and a ring-shaped support leg are used. Pots and containers that are possessed can be used for the electromagnetic cooking device as well as dedicated pots.
[0061]
This means that conventional pots such as aluminum pots and clay pots can be used as they are, and there is no need to prepare cooking utensils such as pots to match the electromagnetic cooker. It is extremely effective in doing so.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a method of using a heat transfer aid for an electromagnetic cooking device.
FIG. 2 is a cross-sectional view showing a ceramic layer formed on a bottom surface of a heating member.
FIG. 3 is a graph showing the relationship between the type of ceramic and radioactivity.
FIGS. 4A and 4B show examples of the shapes of various powders and granules, wherein (A) shows a spherical shape, (B) shows a columnar shape, (C) shows a dice shape, and (D) shows a scale shape.
FIG. 5 is a cross-sectional view showing a part of a cushion made of a granular material placed in a soft wire mesh.
FIG. 6 is a cross-sectional view showing another type of heat transfer aid for an electromagnetic cooking device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 heat generating member 2 heat conductive powder 3 heat transfer auxiliary tool for electromagnetic cooking device 4 pan 4 a bottom surface 6 top plate (electromagnetic cooking device)
7 heating coil 8 foodstuff 11 wire mesh

Claims (8)

A heat transfer auxiliary device disposed between an electromagnetic cooker and a food container containing food, the heat transfer auxiliary device being a plate-like heat generating device that generates heat by receiving an electromagnetic induction action of the electromagnetic cooker. A heat transfer auxiliary tool for an electromagnetic cooker, comprising: a heat-generating part; and a granular material placed on the heat-generating part, adapted to the shape of the food container and transferring the heat of the heat-generating part to the food-container side. The electric heating auxiliary tool for an electromagnetic cooker according to claim 1, wherein the heat-generating portion has a container shape made of a ferromagnetic material, and the granular material is a ferromagnetic material such as iron sand. The electric heating auxiliary tool for an electromagnetic cooker according to claim 1, wherein the heating unit is provided with a ceramic layer on a surface that receives the granular material. The heat-generating portion has a ceramic layer provided on the surface receiving the powdery and granular material, a first ceramic layer having a first radiation spectrum peak on the surface of the heat-generating portion, and a second radiation spectrum peak thereon. 2. The heat transfer device for an electromagnetic cooker according to claim 1, wherein the second ceramic layer is formed in multiple layers, and the temperature of the peak of the first radiation spectrum is higher than the temperature of the peak of the second radiation spectrum. Aids. 4. The heat transfer aid for an electromagnetic cooker according to claim 3, wherein the first ceramic layer is titanium oxide, and the second ceramic layer is aluminum oxide. 2. The heat transfer auxiliary for an electromagnetic cooker according to claim 1, wherein the powdery granules are made of a good heat conductor, and are metal granules obtained by cutting a metal ball, a wire, or a metal plate that generates heat by itself when subjected to an electromagnetic induction action. Utensils. The heat transfer auxiliary tool for an electromagnetic cooker according to claim 1, wherein the powdery granules are small spheres or small pieces made of a good heat conductor made of a material that does not generate heat by the electromagnetic induction action. The heat transfer aid for an electromagnetic cooker according to claim 1, wherein the powdery granules are contained in a heat-resistant bag or a flexible container.

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