JP2004033783A - Lid for electromagnetic induction cooking device and electromagnetic induction cooking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid for a cooking container made of a non-magnetic material capable of electromagnetic induction heating. <P>SOLUTION: The lid for electromagnetic induction cooking and an electromagnetic induction cooking device using the same lid improve the outcome of cooking by electromagnetic induction heating. The lid for electromagnetic induction cooking has an alloy plating material for electromagnetic induction heating formed on a non-magnetic base material, and the alloy plating material for electromagnetic induction heating is constituted by forming an alloy plating film which is made of nickel and iron and is capable of electromagnetic induction heating on a base material. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a cooking vessel lid using an alloy plating material formed by forming an alloy of nickel and iron as a plating film on a non-magnetic substrate and enabling electromagnetic induction heating, and an electromagnetic induction heating cooker using the same. It is about.

2. Description of the Related Art In recent years, electromagnetic induction heating cookers that generate an induction current in a cooking device such as a lid by generating a high-frequency magnetic field and generate heat by heating the lid itself have become widespread. Since this electromagnetic induction heating cooker does not use fire, it is safe, clean and very convenient. As described above, the lid used in the electromagnetic induction heating cooker is required to be a magnetic material because it is necessary to generate an induced current by interlinking with a high-frequency magnetic field. Generally, a magnetic stainless steel or a steel plate is used (for example, Patent Document 1).
JP-A-61-027088

調理 As described above, it is an essential condition that a cooking device such as a lid used for an electromagnetic induction heating cooker having a conventional configuration is made of a magnetic material. On the other hand, non-magnetic materials such as non-magnetic stainless steel, aluminum, glass, and ceramic are often used as the base material of general cooking container lids. Therefore, conventionally, even in the case of these non-magnetic materials, in order to be able to be used as a lid for a cooking vessel for an electromagnetic induction heating cooker, a thick iron plate or stainless steel or the like is stuck on these base materials, or clad, Efforts have been made to produce materials having magnetism by spraying iron or the like. However, at present, there are problems in the selection of the base material, the manufacturing method / capacity, the heat transfer performance / corrosion resistance performance / appearance / weight, etc., and it has not reached the point where it is generally used.

The present invention solves these problems, and forms an alloy plating material for electromagnetic induction heating in which an alloy plating film of nickel and iron capable of electromagnetic induction heating is formed on a substrate, on a non-magnetic substrate. It is an object of the present invention to provide a lid for electromagnetic induction heating cooking and an electromagnetic induction heating cooker using the lid.

One means of the present invention to achieve the above object is to provide an alloy plating film for electromagnetic induction heating having at least nickel and iron and having a thickness of 10 to 100 μm.

。Then, the electromagnetic induction heating alloy plating film is formed on a base material that can be plated to obtain an electromagnetic induction heating alloy plating material.

(4) A lid for a cooker for electromagnetic induction heating using an alloy plating material for electromagnetic induction heating as a lid for a cooking container.

According to the present invention, an alloy plating film for electromagnetic induction heating having at least nickel and iron, having an atomic ratio of nickel / iron of 30/70 to 70/30 and a thickness of 10 to 100 μm. Thus, an alloy plating film of nickel and iron capable of performing electromagnetic induction heating is realized.

(5) By forming the alloy plating film on a base material capable of being plated, an alloy plating material for electromagnetic induction heating that can perform electromagnetic induction heating on any base material is realized.

(4) An alloy plating material for electromagnetic induction heating in which the material of the substrate is a non-magnetic substrate and the non-magnetic substrate has magnetism capable of performing electromagnetic induction heating.

Then, by using an electromagnetic induction heating alloy plating material whose ceramic material is ceramic, glass, nonmagnetic stainless steel, aluminum, or the like as a cooking container lid, or by using a part of the cooking container with an electromagnetic induction heating alloy plating material. By using this, electromagnetic induction heating of the nonmagnetic base material container lid is achieved, and an electromagnetic induction heating cooker with a high soaking effect is realized.

The invention according to claim 1 is an alloy plating film for electromagnetic induction heating having at least nickel and iron, having an atomic ratio of nickel / iron of 30/70 to 70/30 and a film thickness of 10 to 100 μm. Therefore, the magnetic permeability is higher than that of a simple nickel plating film or iron plating film, and a plating film capable of obtaining a large skin current by electromagnetic induction can be obtained.

In particular, since the alloy plating film is an electrolytic plating film, the magnetic domains are aligned by the electric field compared to the electroless plating film, so that the plating film can have a higher magnetic permeability and a greater skin current due to electromagnetic induction. You can do it.

(4) Since the base material that can be plated is a nonmagnetic base material that is an alloy plating material for electromagnetic induction heating, a nonmagnetic base material that could not be heated by electromagnetic induction can be heated by electromagnetic induction.

Furthermore, since the cooking container is used as a lid for a cooker for electromagnetic induction heating using an alloy-plated material for electromagnetic induction heating, lids for ceramic containers such as clay pots whose surfaces are plated with alloy, glass containers, non-magnetic stainless steel containers, aluminum containers, etc. It is intended that a lid for a container, in which it is difficult to perform electronic induction heating using the dough as it is, can be used as a lid for a cooker for electromagnetic induction heating.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
First, preparation of a test piece will be described in detail. A 200 mm × 200 mm × 3.2 mm tempered glass plate with one side masked is immersed in an electroless plating solution maintained at a temperature of 90 ° C., left for 5 to 10 minutes, pulled up, and the one side masking is removed. On the other side, an alloy plating layer of iron and nickel can be obtained. At this time, the composition of the electroless plating solution was as follows: a mixed solution of iron sulfate and nickel sulfate having a concentration of 0.05 mol / L; sodium dihydrogen hypophosphite having a concentration of 0.2 mol / L; Was added to a solution containing sodium citrate having a concentration of 0.2 mol / L and ammonium nitrate having a concentration of 0.5 mol / L, and ammonia was added so that the pH became 10. Further, in the present embodiment, the electroless plating solution is prepared by variously changing the mixing ratio of iron sulfate and nickel sulfate. The thickness of the plating layer thus created is 10 to 100 μm.

(4) Next, the test pieces prepared as described above were tested to determine whether electromagnetic induction heating was possible. For the experiment, an electromagnetic induction heating cooker KZ-P2 (manufactured by Matsushita Electric Industrial Co., Ltd.) was used, the test piece was placed on the cooking plate, and the electromagnetic induction heating cooking was performed using a wattmeter. The output of the vessel was measured. The results are shown in (Table 1) and (Table 2).

メ ッ キ The plating layer of the test piece shown in (Table 1) has variously changed the atomic ratio of nickel and iron, and has a plating thickness of 50 μm. As a comparative example, an aluminum plate having the same dimensions, stainless steel (SUS304, SUS430), and an aluminum plate provided with a 50 μm-thick stainless steel layer on the surface were used. Table 2 shows the case where the atomic ratio of nickel and iron was fixed at 50:50 and the plating thickness was variously changed.

As is clear from Table 1 (Table 1), the nickel-iron alloy plating layer can be a very excellent electromagnetic induction heating member. In other words, the output power of the electromagnetic induction heating cooker is significantly higher than that of the comparative aluminum plate, stainless steel (SUS304), stainless steel (SUS430), aluminum + stainless steel, or nickel alone or iron alone. Is what you can do. That is, an alloy of nickel and iron has a very high magnetic permeability, and a very large skin current due to an induced current generated when linked with a high-frequency magnetic field. From this experiment, it can be seen that the optimum alloy ratio between nickel and iron is 50:50 in atomic ratio.

か ら Also, from Table 2, it can be seen that the larger the thickness of the plating layer, the higher the electromagnetic induction heating output can be obtained, but it becomes almost constant above 80 μm.

The composition of the electroless plating solution is a general one, and any composition can be used as long as it can perform alloy plating of nickel and iron. Further, in the present embodiment, a tempered glass plate is used as a plating substrate, but a non-magnetic material such as ceramic, non-magnetic stainless steel, aluminum, and plastic does not cause any problem.

(Embodiment 2)
First, preparation of a test piece will be described in detail. A 200 mm × 200 mm × 1.0 mm aluminum plate (JIS A1100) with one side masked is immersed in an electrolytic plating solution maintained at a temperature of 75 ° C., and electrolytic plating is performed at a current density of 11 A / dm 2 using the aluminum plate as a cathode. Then, by lifting the aluminum plate and removing the masking on one side, a nickel-iron alloy plating layer can be obtained on the other side. At this time, the composition of the electrolytic plating solution was such that boric acid having a concentration of 40 g / L was added to a mixture of iron chloride hexahydrate and nickel chloride hexahydrate having a concentration of 300 g / L, and this solution was added to this solution. Hydrochloric acid and calcium hydroxide are added so that the pH becomes 3.0. In the present embodiment, an electrolytic plating solution in which the mixing ratio between iron chloride hexahydrate and nickel chloride hexahydrate is variously changed is used. The thickness of the plating layer thus created is 10 to 100 μm.

(4) Next, an experiment was conducted to determine whether or not electromagnetic induction heating was possible for the specimen thus prepared. For the experiment, an electromagnetic induction heating cooker KZ-P2 (manufactured by Matsushita Electric Industrial Co., Ltd.) was used, the test piece was placed on the cooking plate, and the electromagnetic induction heating cooking was performed using a wattmeter. Is measuring the output of the vessel. The results are shown in (Table 3) and (Table 4).

メ ッ キ The plating layer of the test piece shown in (Table 3) has variously changed the atomic ratio of nickel and iron, and has a plating thickness of 60 μm. As a comparative example, an aluminum plate having the same dimensions, stainless steel (SUS304, SUS430), and a stainless steel layer having a thickness of 50 μm provided on the surface of the aluminum plate are used. Table 4 shows the case where the atomic ratio of nickel and iron was fixed at 50:50 and the plating thickness was variously changed.

As is clear from Table 3 (Table 3), when the electrolytic plating solution is used, the induction heating characteristics tend to be slightly better than when the electroless plating solution is used. Similar to the case of using the electroless plating solution, the electromagnetic induction heating is higher than that of the comparative aluminum plate, stainless steel (SUS304), stainless steel (SUS430), aluminum + stainless steel, or nickel alone or iron alone. The output power of the cooker can be made very large. From this experiment, it can be seen that the optimum alloy ratio between nickel and iron is 50:50 in atomic ratio. Also, from Table 4, it can be seen that the larger the thickness of the plating layer, the larger the electromagnetic induction heating output can be obtained, but it becomes almost constant above 60 μm.

Next, the characteristics of electrolytic plating and electroless plating were compared. In this experiment, a test piece in which a 60 μm-thick alloy plating layer was formed by electrolytic plating on the aluminum plate and a test piece in which a 60 μm-thick alloy plating layer was formed by electroless plating were the same electromagnetic induction heating cooker. It is placed on a cooking plate, and the output of the electromagnetic induction heating cooker is measured using a wattmeter. The results are shown in (Table 5).

な As is evident from the results, the alloy layer obtained by electrolytic plating can obtain a higher electromagnetic induction heating output than the alloy layer obtained by electroless plating. This is considered to be because the magnetic domains formed by nickel and iron have the same orientation by electrolytic plating.

The composition of the electrolytic plating solution is a general condition, and any composition can be used as long as the composition can be used for plating an alloy of nickel and iron. In the present embodiment, an aluminum plate is used as a plating substrate. However, stainless steel or a steel plate does not cause any problem.

(Embodiment 3)
Next, an electromagnetic induction heating cooker according to a third embodiment of the present invention will be described. In the present embodiment, the electromagnetic induction heating cooker shown in FIG. 1 is used as the electromagnetic induction heating cooker. Inside the main body 3 is provided an inner pot 1 containing a cooked product 8 of rice and water. The inner pan 1 has on its outer surface an alloy-plated surface 1a obtained by applying the alloy plating described in the second embodiment on an aluminum base material. The inner surface of the inner pot 1 is a fluorine-coated surface 1b. Reference numeral 5 denotes an outer lid that covers the inner pot 1 with a hinge 4 so as to be freely opened and closed. The outer lid 5 is provided with a heating plate 2 on the side corresponding to the inner pan 1. The surface of the heating plate 2 also has the same alloy-plated surface 2a as the inner pot 1 and a fluorine-coated surface 2b. The composition of the alloy plating is such that the ratio of nickel to iron is 50:50 and the thickness is 60 μm. A pan heating IH coil 6 for generating a high-frequency magnetic field is provided below the inner pan 1, and an IH coil 7 for heating the heating plate 2 is also provided inside the outer lid 5. 9 is a power cord for supplying power to the main body 1.

Hereinafter, the operation of the present embodiment will be described. When a rice cook start button (not shown) is pressed, a high-frequency current is supplied to the IH coil 6 and the IH coil 7, and the IH coil 6 and the IH coil 7 generate a high-frequency magnetic field. This high-frequency magnetic field links the inner pot 1 having the surface with the alloy plating layer 1a and the heating plate 2 on which the same alloy plating is performed. Therefore, the alloy plating layer 1a and the heating plate 2 of the inner pot 1 are induction-heated and generate heat. Due to this heat generation, cooking of the food 8 stored in the inner pot 1 proceeds. At the stage where the rice cooking is completed, the control circuit (not shown) operates to cut off the power supply to the IH coil 6, and the power supply to the IH coil 7 is performed to automatically enter the heat retaining mode.

(4) Next, the rice cooking experiment was performed by changing the materials of the inner pan 1 and the heating plate 2. In this experiment, the inner pan 1 and the heating plate 2 were made of the alloy-plated aluminum, aluminum alone, and magnetic stainless steel. The results of this experiment are shown in (Table 6).

明 ら か As is clear from these results, the one using alloy-plated aluminum has the best rice cooking performance. It should be noted that those made of aluminum as the material of the pot have a soaking effect due to the high thermal conductivity of aluminum, and are less likely to cause uneven cooking. Further, the radiant heat from the heating plate 2 is evenly distributed, so that the stickiness of the rice is appropriate.

Although not shown in (Table 6), the one using the aluminum-stainless steel clad material has the disadvantage that although the rice cooking performance similar to that of alloy-plated aluminum can be obtained, the weight of the base material is heavy. Is what it is.

The figure which shows the structure of the electromagnetic induction heating rice cooker which is 3rd Embodiment of this invention.

Explanation of reference numerals

{2a} Heat-plated alloy plating surface

Claims (2)

A nonmagnetic base for a cooking container lid having at least nickel and iron, and having an atomic ratio of nickel / iron of 30/70 to 70/30 and a film thickness of 10 to 100 μm. Electroplated gold-plated film for electromagnetic induction heating cooker lid. A non-magnetic base material which has at least nickel and iron, and has an atomic ratio of nickel / iron of 30/70 to 70/30 and a thickness of 10 to 100 μm, and is electroplated with an alloy plating film for electromagnetic induction heating. An electromagnetic induction heating cooker using a cooking vessel lid.

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