JP4159426B2 - Induction cooker pan - Google Patents

Description

  The present invention relates to a pan that can be used for an electromagnetic cooker based on the principle of electromagnetic induction heating and can be cooked.

  An electromagnetic cooker can cook food without a flame, does not generate combustion gas such as carbon dioxide, does not ignite oil during tempura cooking, and has high energy efficiency. It is also popular in the home.

  Conventionally, pans that can be used in an electromagnetic cooker have been limited to those made of materials that generate eddy currents and self-heat when placed on the electromagnetic cooker. A pot made of ceramic or nonmetal that can be used has been developed (for example, see Patent Document 1).

  On the other hand, as an exothermic film, an earthenware pan for an electromagnetic cooker formed by attaching a sprayed film to the bottom surface of an earthenware pan has been proposed (for example, see Patent Document 2). In the production process of this earthenware pan for an electromagnetic cooker, the metal sprayed film shrinks after spraying and the periphery of the film may turn over and peel off, so to prevent this, create a non-sprayed part in the center part of the pan bottom, Measures are taken to create a ring-shaped narrow non-sprayed part around this.

Japanese Laid-Open Patent Publication No. 9-100194 (page 2-4) JP 2000-237045 A (page 3-6)

  The ceramic for an electromagnetic cooker described in Patent Document 1 is provided with a heat generation film made of silver and platinum on the bottom surface of the bottom, and a peeling prevention film made of calcium silicate is provided to cover the heat generation film. However, when cooking with an electromagnetic cooker is repeated, fine cracks or cracks may be generated in the heat generating film or the heat generating film may be partially peeled off due to the difference in the thermal expansion coefficient between the ceramic and the heat generating film. Sometimes. Moreover, when it uses for the AC200V type electromagnetic cooker with a quick heating rate, possibility that such a crack, peeling, or peeling will arise increases.

  When such a crack occurs, the heat generating film is partially cut, so even if it is placed on the electromagnetic cooker as prescribed, eddy currents are not generated as rated in the heat generating film, and the heat generation amount is reduced. May drop significantly. Further, if the exothermic film is partially peeled off, heat conduction from the exothermic film to the ceramic is hindered, so that the thermal efficiency is lowered.

  On the other hand, in the case of the earthenware pan for the electromagnetic cooker described in Patent Document 2, by providing a narrow arc-shaped non-sprayed portion centering on the non-sprayed portion at the center of the pan bottom, the peripheral edge of the metal sprayed film caused by shrinkage after spraying It can prevent turning and peeling. However, since this metal sprayed film is a relatively thick film having a thickness of 100 μm to 150 μm or more, when heating cooking using an electromagnetic cooker is repeated, due to the difference in thermal expansion coefficient between the earthenware pot and the metal sprayed film. Fine cracks and cracks may be generated in the metal sprayed film or may be partially peeled off. In particular, when it is used in an AC 200 V type electromagnetic cooker with a high heating rate, the possibility of such cracks, cracks or peeling becomes significant. In addition, since the non-sprayed portion has an arc shape, it may not be possible to prevent the crack generated in the metal sprayed film from proceeding in the radial direction of the pan bottom.

  In addition, it is difficult to form a metal sprayed film uniformly, and the film thickness tends to vary. When used on an electromagnetic cooker, a large current flows through the thick part and the amount of heat generated is large. Thus, a crack or a crack may occur between the thick part and the thin part. Such cracks and cracks cannot be prevented by providing the aforementioned non-sprayed portion.

  The problem to be solved by the present invention is to provide a pan for an electromagnetic cooker that is not easily cracked, cracked or peeled off in the heat generating layer and has excellent durability.

The pot for the electromagnetic cooker of the present invention is a porcelain pot containing silicon dioxide, aluminum oxide, ferric oxide, titanium dioxide, calcium oxide, magnesium oxide, sodium oxide, magnesium oxide, sodium oxide, potassium oxide and lithium oxide. a body, platinum, a heating layer formed on both the inner bottom and outer bottom of silver of at least one contains a pan body, silicon oxide, boron oxide, sodium oxide, contain any of potassium oxide heating layer A non-heat generating portion having no heat generating layer on a part of the inner bottom surface and the outer bottom surface of the pan body on which the heat generating layer is formed. It is provided. Here, the inner bottom surface refers to the bottom surface portion inside the pot body, and the outer bottom surface refers to the bottom surface portion outside the pot body.

  By adopting such a configuration, the non-heat generating part can relieve the difference in shrinkage due to the difference in thermal expansion coefficient between the pan body and the heat generating layer when heating cooking using the electromagnetic cooker is repeated. As a result, cracks and cracks are not generated or peeled off in the heat generating layer, and the durability is excellent. Even if cracks or cracks occur in the heat generation layer, the progress of these cracks or cracks is stopped at the non-heat generation part, so that they do not develop into cracks or cracks that cause a decrease in the amount of heat generation. .

  Here, it is desirable that the non-heat generating portion is arranged in any one of a circular shape, an elliptical shape, a polygonal shape, and a spotted shape. If the non-heat generating portion is arranged in a circular shape, an elliptical shape, or a polygonal shape, the function of preventing cracks and cracks that progress in the radial direction of the bottom portion of the pan body is enhanced. Further, if the non-heat generating portion is arranged in a spot shape, it is possible to prevent the occurrence of cracks and cracks regardless of the traveling direction.

  In this case, it is desirable that the non-heat generating portion is arranged in any one of a concentric circular shape, a concentric elliptical shape, and a concentric polygonal shape. If arranged in such a state, the non-heat generating part is in a state of being evenly arranged over the entire bottom surface of the pan body, and there will be a plurality of non-heat generating parts at a distance, so the occurrence of cracks and cracks, The function of preventing progress is further improved.

  On the other hand, when the non-heat generating portions are arranged in a spot shape, it is desirable to arrange these non-heat generating portions so as to be arranged on a plurality of concentric circles. With such an arrangement, the generation state of eddy currents in the heat generating layer is made uniform, and eddy currents are not concentrated on a part of the heat generating layer, so that the crack prevention function is improved.

  In this case, since the shape of the non-heat generating portion arranged in a spot shape is a circular spot, the heat generating layer forming the outer edge of the non-heat generating portion becomes a circular shape with a smooth curve. It is possible to avoid the occurrence of cracks and cracks. Moreover, since the function of relaxing the thermal expansion of the heat generating layer is exhibited, it is effective in preventing the occurrence of cracks and cracks.

(1) Porcelain pan body containing silicon dioxide, aluminum oxide, ferric oxide, titanium dioxide, calcium oxide, magnesium oxide, sodium oxide, magnesium oxide, sodium oxide, potassium oxide and lithium oxide, platinum, silver formed so as to cover at least one contains an inner bottom surface and the heating layer formed on both the outer bottom surface of the pan body, silicon oxide, boron oxide, sodium oxide, a heat generating layer contains any of potassium oxide The heat expansion coefficient of the pan body and the heat generating layer is provided by providing a non-heat generating portion in which the heat generating layer does not exist on a part of the inner bottom surface and the outer bottom surface of the pan body on which the heat generating layer is formed. Because the non-heat-generating part can relieve the difference in shrinkage due to the difference in the heat generation layer, cracks and cracks will not occur in the heat generation layer, and it will not peel off, And it is excellent in durability. Even if cracks or cracks occur in the heat generation layer, the progress of these cracks or cracks is stopped at the non-heat generation part, so that they do not develop into cracks or cracks that cause a decrease in the amount of heat generation. .

(2) If the non-heat generating portion is arranged in a circular shape, an elliptical shape, or a polygonal shape, the function of preventing cracks and cracks that progress in the radial direction of the bottom of the pan body is enhanced, and the non-heat generating portion is arranged in a spot shape. If it does so, a crack and generation | occurrence | production of a crack can be prevented irrespective of the advancing direction.

(3) If the non-heating part is arranged in any one of a concentric circular shape, a concentric elliptical shape, and a concentric polygonal shape, a plurality of non-heating parts are spaced apart and evenly on the entire bottom surface of the pan body Since it will be in the state of being arranged, the function which prevents a crack and the generation and progress of a crack further improves.

(4) If the spot-like non-heat generating parts are arranged so as to be arranged on a plurality of concentric circles, the generation state of eddy currents in the heat generating layer is made uniform, and eddy currents are not concentrated on a part of the heat generating layer. Therefore, the crack prevention function is improved.

(5) Since the heat generating layer forming the outer edge of the non-heat generating portion becomes a circular shape with a smooth curve by making the shape of the non-heat generating portion arranged in a spot shape a circular spot, the non-heat generating portion is a heat generating layer. It is possible to avoid the generation of cracks and cracks, and the thermal expansion of the heat generating layer surrounding the non-heat generating portion can be mitigated, which is also effective in preventing the generation of cracks and cracks.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view showing a pan for an electromagnetic cooker according to a first embodiment of the present invention, and FIG. 2 is a bottom view of the pan for an electromagnetic cooker shown in FIG.

  As shown in FIG. 1 and FIG. 2, in the pan 1 for an electromagnetic cooking device of the present embodiment, the pan body 2 having a pair of handles 3 is made of silicon dioxide, aluminum oxide, ferric oxide, titanium dioxide, calcium oxide, and oxidation. Made of porcelain containing magnesium, sodium oxide, magnesium oxide, sodium oxide, potassium oxide and lithium oxide. The pan body 2 is baked using reinforced porcelain materials such as quartz, sericite, kaolinite, and alumina as main raw materials.

  As shown in FIG. 2, a heat generation layer 4 containing silver is formed in a donut shape in a bottom view state on the outer bottom surface of the pan body 2, and silicon oxide and boron oxide are coated so as to cover the entire heat generation layer 4. , A protective layer 5 containing sodium oxide and potassium oxide is formed. There is no heat generating layer 4 in the region inside the inner peripheral edge 4 a of the heat generating layer 4 and the region between the outer peripheral edge 4 b and the hill 2 a, and the protective layer 5 directly covers the outer bottom surface of the pan body 2.

  In addition, in the heat generating layer 4 having a donut shape in a bottom view, a large number of circular non-heat generating portions 6 in which the heat generating layer 4 does not exist are arranged in a spot shape. In these non-heat generating parts 6, the protective layer 5 directly covers the outer bottom surface of the pan body 2. Since the heat generating layer 4 has a dense property, it should be displayed in black on the entire surface in FIG. 2, but for the convenience of displaying the drawing (if the entire surface is black, the lead line indicating the non-heat generating portion 6 is integrated with the heat generating layer 4. Therefore, the heat generating layer 4 is displayed by a fine point distribution.

  As shown in FIG. 1, when the electromagnetic cooker pan 1 is placed at a predetermined position of the electromagnetic cooker 7 and the power is turned on, heat is generated on the outer bottom surface of the electromagnetic cooker pan 1 by an alternating magnetic field generated from the electromagnetic cooker 7. Since the eddy current is generated in the layer 4 and the heat generating layer 4 generates heat by the electric resistance heat generation at this time, this heat is transmitted to the pan body 2 and the food F contained therein can be cooked by heating.

  Thus, even if the pan body 2 is formed of a non-conductive porcelain material, cooking using the electromagnetic cooker 7 is possible, and thus heating by far infrared rays, which is a function unique to the electromagnetic cooker pan 1. It is convenient because the function and the heat retaining function can be exhibited. Moreover, since the heat generating layer 4 contains silver, induction heating efficiency is high and the heat generation amount is also high. Furthermore, since the protective layer 5 contains glaze components such as silicon oxide, boron oxide, sodium oxide, and potassium oxide, the adhesiveness with the pan body 2 and the heat generating layer 4 is good, such as detergent and salt. It is not corroded by chemicals and has excellent durability.

  Moreover, since the heat generating layer 4 is not disposed on the entire outer bottom surface of the pan body 2, but is disposed in a donut shape, the amount of expensive silver used as a constituent material of the heat generating layer 4 can be reduced, and the vortex can be reduced. It is possible to prevent heat generation due to electric current from being concentrated in one place near the center of the outer bottom surface. Moreover, since the heat generating layer 4 as a whole generates heat uniformly by making the eddy current uniform, it is possible to prevent the occurrence of cracks and cracks. In addition, there is an effect that it is possible to cope with the unevenness of the non-heat generating portion 6 in units of microns.

  Furthermore, in the region where the heat generating layer 4 is formed, a large number of non-heat generating portions 6 where the heat generating layer 4 does not exist are arranged in the form of spots, so that when cooking is repeated using the electromagnetic cooker 7, These non-heat generating portions 6 can alleviate the difference in shrinkage due to the difference in thermal expansion coefficient between the main body 2 and the heat generating layer 4. For this reason, even if heat cooking is repeated, the heat generation layer 4 is not cracked or cracked or peeled off, and is excellent in durability. Even if cracks or cracks occur in the heat generating layer 4, the progress of these cracks or cracks is stopped by the non-heat generating portion 6, so that the cracks or cracks that cause a decrease in the amount of heat generation develop. There is no.

  The method for forming the heat generating layer 4 is not particularly limited. For example, a screen printing method or a pad printing method is preferable. When the heat generating layer 4 is formed by such a printing method, an effect that the uniformity of the film thickness of the heat generating layer 4 is increased by adopting a configuration in which a large number of spot-like non-heat generating portions 6 are arranged in the entire heat generating layer 4. Can also be obtained.

  In the present embodiment, as shown in FIG. 2, the non-heat generating portions 6 are arranged so as to be arranged on a plurality of concentric circles, so that eddy currents can be prevented from concentrating on one place, Heat generation is made uniform by equalizing the current, and cracks and cracks can be prevented.

  Furthermore, since the heat generating layer 4 forming the outer edge of the non-heat generating portion 6 has a smooth circular shape by making the shape of the non-heat generating portion 6 a circular spot, the non-heat generating portion 6 itself is cracked or cracked in the heat generating layer 4. Can be avoided. Moreover, since the thermal expansion of the heat generating layer 4 surrounding the non-heat generating portion 6 can be relaxed, it is effective in preventing the occurrence of cracks and cracks.

  In addition, in the electromagnetic cooker pan 1, the protective layer 5 is colorless and transparent in order to clearly show the arrangement shape of the heat generating layer 4 and the non-heat generating part 6. However, the present invention is not limited to this. It is also possible to add a color or to make the color of the protective layer 5 the same as the color of the heat generating layer 4. If the protective layer 5 has the same color as the heat generating layer 4, the arrangement shape of the heat generating layer 4 and the non-heat generating portion 6 becomes inconspicuous in the outer bottom surface portion of the electromagnetic cooker pan 1, so that the effect of improving the appearance can be obtained. .

  Here, with reference to FIG. 3, other embodiment regarding the heat generating layer 4 and the protective layer 5 which comprise the pan 1 for electromagnetic cookers is described. FIG. 3 is a vertical cross-sectional view showing another embodiment relating to the heat generating layer and the protective layer constituting the pan 1 for the electromagnetic cooking device shown in FIG.

  In the pan 8 for an electromagnetic cooker shown in FIG. 3 (a), the heat generating layer 4 and the protective layer 5 covering the heat generating layer 4 are formed on both the outer bottom surface and the inner bottom surface of the pan body 9, and FIG. In the illustrated electromagnetic cooker pan 10, the heating layer 4 and the protective layer 5 covering the heating layer 4 are formed only on the inner bottom surface of the pan body 11. The shapes and functions of the heat generating layer 4 and the protective layer 5 are the same as in the case of the electromagnetic cooker pan 1 shown in FIGS.

  In the pan 8 for an electromagnetic cooker shown in FIG. 3 (a), since the heat generating layer 4 and the protective layer 5 are formed on both the outer bottom surface and the inner bottom surface of the pan body 9, the amount of heat generation is large, and the food F is quickly cooked. can do. In addition, since the heat generating layer 4 is provided on both the outer bottom surface and the inner bottom surface, a sufficient amount of heat can be obtained even if each heat generating layer 4 is thinned. There is also an effect that it can be prevented.

  On the other hand, in the electromagnetic cooker pan 10 shown in FIG. 3 (b), since the heat generating layer 4 and the protective layer 5 are formed only on the inner bottom surface of the pan body 9, the heat generating layer 4 is present at a position close to the food. As a result, the effect that the foodstuff F can be heated quickly is acquired. In addition, about the other function and effect regarding this electromagnetic cooker pan 10 and the above-mentioned electromagnetic cooker pan 8, it is the same as that of the electromagnetic cooker pan 1 mentioned above.

  Next, with reference to FIG. 4, the pan 20 for electromagnetic cookers which is 2nd Embodiment of this invention is demonstrated. FIG. 4: is a bottom view which shows the pan for electromagnetic cookers which is 2nd Embodiment of this invention. In addition, about the part which demonstrates the same function and effect as the component part of the electromagnetic cooker pan 1 mentioned above in the component part of the electromagnetic cooker pan 20, it attaches | subjects the same code | symbol as FIG. 1, FIG. Omitted.

  In the electromagnetic cooker pan 20 of the present embodiment, donut-shaped heat generating layers 24a, 24b, and 24c having different diameters are concentrically arranged on the outer bottom surface of the pan body 21, and between these heat generating layers 24a, 24b, and 24c. In addition, two non-heat generating portions 26a and 26b are concentrically arranged, and a protective layer 25 is formed so as to cover these heat generating layers 24a, 24b and 24c and the non-heat generating portions 26a and 26b. Further, in the region inside the inner peripheral edge 24d of the heat generating layer 24a and the region between the outer peripheral edge 24e of the heat generating layer 24c and the hill 21a, the pan body 21 is directly covered with the protective layer 25.

  Since the heat generating layers 24a, 24b, and 24c are dense, they should be displayed in black on the entire surface in FIG. 4. However, for the convenience of displaying the drawing (if the entire surface is black, the non-heat generating portions 26a and 26b are shown. Since the lead lines and the like are not visible together with the heat generating layers 24b and 24c), the heat generating layers 24a and 24b are displayed by a fine distribution of points.

  In the electromagnetic cooker pan 20, since the two non-heat generating portions 26a, 26b are concentrically arranged between the heat generating layers 24a, 24b, 24c, cracks that progress in the radial direction at the bottom of the pan body 21 Cracks can be effectively prevented. In addition, when compared with the above-described electromagnetic cooker pan 1 provided with a spot-like non-heating part, it can be said that the progress in the radial direction can be kept to a minimum regardless of where the crack or crack occurs. An effect is obtained. Furthermore, since the heating layers 24a, 24b, and 24c are independent of each other, it is possible to easily cope with the size of the diameter of the bottom of the pan body 21 by increasing or decreasing the number of these layers. There is also.

  In the present embodiment, the heat generating layers 24a, 24b, 24c and the non-heat generating portions 26a, 26b are arranged only on the outer bottom surface of the pan body 21, but the present invention is not limited to this, as shown in FIG. In addition, it can be arranged on both the outer bottom surface and the inner bottom surface of the pan body 21, or can be arranged only on the inner bottom surface.

  The pan for an electromagnetic cooker according to the present invention can be widely used when cooking with a generally used electromagnetic cooker, and also used for a cooker such as a gas stove, microwave oven, oven, halogen heater, etc. Can be cooked, boiled, boiled, cooked, steamed, hot water roasted, etc.

BRIEF DESCRIPTION OF THE DRAWINGS It is a vertical sectional view which shows the pan for electromagnetic cookers which is 1st Embodiment of this invention. It is a bottom view of the pan for electromagnetic cookers shown in FIG. It is a vertical sectional view which shows other embodiment regarding the heat-generating layer and protective layer which comprise the pan for electromagnetic cookers shown in FIG. It is a bottom view which shows the pan for electromagnetic cookers which is 2nd Embodiment of this invention.

Explanation of symbols

1,8,10,20 Electromagnetic cooker pan 2,9,11,21 Pan body 2a, 9a, 11a, 21a Height 3 Handle 4, 24a, 24b, 24c Heat generation layer 4a, 24d Inner edge 4b, 24e Outer edge 5 , 25 Protective layer 6, 26a, 26b Non-heating part 7 Electromagnetic cooker F Food

Claims (5)

Porcelain pan body containing silicon dioxide, aluminum oxide, ferric oxide, titanium dioxide, calcium oxide, magnesium oxide, sodium oxide, magnesium oxide, sodium oxide, potassium oxide and lithium oxide, and at least one of platinum and silver a heat generating layer formed on both the inner bottom and outer bottom surface of the pan body containing silicon oxide, boron oxide, sodium oxide, is formed so as to cover the heat generating layer contains any of potassium oxide A pan for an electromagnetic cooker with a protective layer,
A pan for an electromagnetic cooker, characterized in that a non-heat generating portion in which the heat generating layer does not exist is provided on a part of the inner bottom surface and the outer bottom surface of the pan body on which the heat generating layer is formed.   The pan for an electromagnetic cooker according to claim 1, wherein the non-heat generating portion is arranged in any one of a circular shape, an elliptical shape, a polygonal shape, and a spotted shape.   The pan for an electromagnetic cooker according to claim 1, wherein the non-heat generating portion is arranged in any one of a concentric circular shape, a concentric elliptical shape, and a concentric polygonal shape.   The pan for an electromagnetic cooker according to claim 2, wherein the spot-like non-heating parts are arranged so as to be arranged on a plurality of concentric circles.   The pan for an electromagnetic cooker according to claim 4, wherein the shape of the non-heating part arranged in a spot shape is a circular spot.

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