JP3698116B2 - Heating plate and pan for induction heating cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention enables heating with an induction heating cooker in a non-metallic pan that could not be heated with an induction heating cooker, and by adding a self-temperature control function, The present invention relates to a heating plate for induction heating cookers and a non-metal pan for induction heating cookers that prevents the occurrence of unsafe conditions such as fire and ignition.
[0002]
[Prior art]
In recent years, induction cooking devices have been widely used in ordinary households because of their excellent safety, ease of use, and high thermal efficiency. 200V compatible models have also been developed and are generally understood in terms of high thermal power.
[0003]
As shown in FIG. 10, the induction heating cooker is made of iron or stainless steel placed on the top plate by a high-frequency magnetic flux generated by applying a high-frequency current to the heating coil 22 disposed below the top plate 21. Eddy current is generated in the object to be heated 23 (pan), and the pan is controlled by the control unit 24 so that the pan itself directly generates heat.
[0004]
In addition, a temperature sensor 25 for detecting the temperature of the pan is also provided as a standard at the lower part of the top plate of the induction heating cooker, so that an “overtemperature prevention function” for controlling the heating state according to the detected temperature can be provided. It can be used safely.
[0005]
However, recent induction cookers have high thermal power, so the food is likely to burn, or when cooking with a small amount of oil, it may be heated to near the ignition temperature of the oil, and further safety is required. Has been.
[0006]
Therefore, in recent years, as disclosed in Japanese Patent No. 2917526 and Japanese Patent No. 3079573, it has been proposed to use a metal having a Curie point near the temperature used for actual cooking as the metal used in the pan. Since metal loses its magnetism above the Curie point, it is characterized by not being heated by induction heating. Taking advantage of this feature, a pan in which the temperature of the pan itself is not heated above the Curie point (hereinafter referred to as a “temperature-sensitive pan”) has also been studied.
[0007]
[Problems to be solved by the invention]
Although it is the induction heating cooking appliance which has the outstanding characteristic in this way, the subject that the cooking appliance made from nonmetallic materials, such as a clay pot and a glass pot, cannot be used on the characteristic of the heating method. In order to cope with such a problem, for example, a pan capable of induction heating has been proposed by forming a silver thin film or the like on the bottom of an earthen pan. However, when the base material of the pan is a non-metallic material such as ceramic, the heat conduction is poor compared to metal, so the heat induced by the thin film is not easily transferred to the entire pan, and the temperature of the heating part rises. There was a problem that it was easy to do. This problem was prominent when the pan was baked, and the phenomenon of disconnection and peeling of the heat generation layer was likely to occur.
[0008]
In addition, a heating plate or the like that is configured to heat a pan indirectly by placing a pan that does not generate heat by induction heating on a metal that can generate heat by induction heating is also proposed. There was a problem that heat conduction between the pan and the heating plate was poor and the pan was not sufficiently heated, or the temperature of the heating plate increased too much, and the heating was stopped by the temperature control function of the cooker body.
[0009]
In addition, a method has also been proposed in which a stainless steel plate is put into a non-metallic pan such as an earthen pot, and the plate is heated by induction heating.In this case, the food tends to stick to the plate, As shown in FIG. 10, the temperature sensor of the main body of the cooker generally detects the temperature through a top plate and a non-metallic pan having a very poor heat transfer property. Therefore, even if the temperature of the plate rises abnormally, the temperature sensor There was a fatal problem that the detection by the sensor was delayed and it became an unsafe state.
[0010]
The present invention solves such conventional problems, and efficiently heats non-metallic pots such as earthen pots and glass pots, and at the time of abnormal heating, by the self-temperature control function of the heating plate An object of the present invention is to provide a heating plate for an induction heating cooker and a non-metallic pan for an induction heating cooker that ensure safety by preventing the temperature from rising above a predetermined temperature.
[0011]
[Means for Solving the Problems]
The present invention to solve the above problems, a non-magnetic metal, in one Curie temperature of 100 ° C. or less, and a magnetic metal having two different predetermined Curie temperature is other Curie temperature of 100 ° C. or higher And having a self-temperature control function of different temperatures on both the back and the front and providing a space layer between the bottom of the pan and the non-magnetic metal sandwiched between the magnetic metals The heating plate for an induction heating cooker is put into a non-metallic pan and heated. By having such a configuration, when the heating plate is installed with the surface having a Curie temperature of 100 ° C. or less down, moisture in the pan does not boil regardless of the heating power setting of the induction heating cooker body, In cooking that requires long-time stew, cooking can be performed more safely, and when a heating plate is installed with the Curie temperature of 100 ° C or higher facing down, the water in the pan will boil and the set temperature will be reached. It is possible to perform cooking according to safety. Moreover, heat can be efficiently transmitted to the cooked food through moisture or the like that has entered the space layer. In addition, when the amount of moisture in contact with the heating surface side of the heating plate, that is, the magnetic metal side is small, bump temperature may occur because the temperature of the moisture rises rapidly. Since a certain amount of moisture is present in this space layer, the bumping phenomenon as described above is less likely to occur.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is based on setting two Curie temperatures to 100 ° C. or lower and the other Curie temperature to 100 ° C. or higher in two kinds of magnetic metals. By having such a configuration, when the heating plate is installed with the surface having a Curie temperature of 100 ° C. or less down, moisture in the pan does not boil regardless of the heating power setting of the induction heating cooker body, In cooking that requires long-time stew, cooking can be performed more safely, and when a heating plate is installed with the Curie temperature of 100 ° C or higher facing down, the water in the pan will boil and the set temperature will be reached. It is possible to perform cooking according to safety.
[0013]
Moreover, a space layer is provided between the heating plate for induction heating cookers and the bottom of the pan. With such a configuration, heat can be efficiently transmitted to the cooked food through moisture or the like that has entered the space layer. In addition, when the amount of moisture in contact with the heating surface side of the heating plate, that is, the magnetic metal side is small, bump temperature may occur because the temperature of the moisture rises rapidly. Since a certain amount of moisture is present in this space layer, the bumping phenomenon as described above is less likely to occur.
[0014]
According to a second aspect of the present invention, in the heating plate for induction heating cooker, a hole is provided for passing bubbles such as water vapor generated on the lower surface of the plate. By adopting such a configuration, bubbles such as water vapor generated on the back surface of the heating plate are efficiently removed, so that bumping or the like hardly occurs and cooking can be performed stably. In addition, the convection state of the food can be controlled by the position of the hole. For example, when a hole is formed in a concentric shape corresponding to the center of the heating coil, the bubble rises most, and convection that stirs the whole occurs, so that cooking can be performed more efficiently.
[0015]
According to the third aspect of the present invention, as a means for integrating the respective metals constituting the heating plate for the induction heating cooker, only a part of the opposing surfaces of the magnetic metal and the nonmagnetic metal are combined. is there. Since each metal constituting the heating plate has a different coefficient of thermal expansion, warping due to a difference in expansion occurs during heating if the entire surface is completely joined. However, by adopting the configuration of the present invention, warpage due to the difference in expansion occurs only at the joining portion of each metal, so that the warpage of the entire heating plate is reduced and cooking can be performed stably.
[0016]
In the invention according to claim 4 of the present invention, as a means for integrating the respective metals constituting the heating plate for induction heating cooking, it is not combined with the whole surface in contact with each other so that the vertical movement does not occur. It is sandwiched and fixed with a jig. By adopting such a configuration, even when each metal having a different coefficient of thermal expansion is heated, warpage of the entire heating plate due to the difference in expansion does not occur, so that cooking can be performed more stably.
[0017]
In the invention according to claim 5 of the present invention, the heating plate for the induction heating cooker is integrated and fixed by a configuration in which it is detachably fixed to the bottom of the pan. By adopting such a configuration, the heating plate placed on the bottom of the pan does not move, the input value is stabilized, and stirring of the cooked food or the like can be eliminated.
[0018]
The invention according to claim 6 of the present invention is configured such that a handle thinner than the thickness of the entire plate is attached to the end of the heating plate for the induction heating cooker. By adopting such a configuration, it is possible to use the present heating plate alone as a pottery cooker, or to place a pan or the like that is not heated by induction heating, and indirectly heat the cooked food. Also, when used upside down, regardless of the shape of the cooker body, there is no such thing as a handle, and it can be used without any problems.
[0019]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
(Reference Example 1)
FIG. 1 is a sectional view of an induction heating cooker heating plate (hereinafter referred to as “IH heating plate”) showing Reference Example 1 of the present invention. 1 is a non-metallic pot, this time using a clay pot. An IH heating plate 2 is installed at the center of the bottom of the earthenware pot 1. In this IH heating plate, a magnetic metal (hereinafter referred to as “temperature-sensitive metal”) 2a having a predetermined Curie temperature and an aluminum alloy 2b which is a nonmagnetic metal are integrated. These earthenware pan and IH heating plate are arranged at positions facing the heating coil 4 via the top plate 3 of an induction heating cooker (hereinafter referred to as “IH cooker”). Here, as the temperature-sensitive metal 2a, a 38Ni—Fe alloy having a Curie temperature of 260 ° C. was used.
[0021]
Oden was cooked in a clay pot in this state. Even in an earthen pot that could not be heated with a conventional IH cooker, it was possible to heat and cook well with such a configuration.
[0022]
Next, the soup in the earthenware pan was removed, and only the ingredients of the cooked food were prepared, and then heated again with the IH cooker. However, the temperature of the IH heating plate did not rise above 260 ° C, which is the Curie temperature of the thermosensitive metal. The food never ignited.
[0023]
Here, the temperature-sensitive metal 2a and the aluminum 2b, which are constituent elements of the IH heating plate 2, were integrated by being clad. The method for integrating the two is not limited to this, and there is no restriction as long as the magnetic flux passes between the two metals, such as brazing, crimping, explosive bonding, and caulking. Here, aluminum is used as the nonmagnetic metal, but the present invention is not limited to this, and copper or the like may be used. In particular, when a good heat conductor is used as the nonmagnetic metal, the heat uniformity on the entire surface of the heating plate is improved, and it is possible to cook well while suppressing sticking. (The same applies hereinafter)
(Reference Example 2)
FIG. 2 is a cross-sectional view of the main configuration of an IH heating plate showing Reference Example 2 of the present invention. Reference numeral 1 denotes a clay pot similar to that of Reference Example 1, and an IH plate 2 is installed at the center of the bottom surface. In this heating plate for IH, a temperature-sensitive metal 2a, an aluminum alloy 2b, and stainless steel 2c as a second magnetic metal, which are the same as those in Reference Example 1, are integrated by a cladding method. As the stainless steel 2c, SUS430 having a thermal expansion coefficient relatively close to that of the Fe—Ni alloy was used.
[0024]
Oden was cooked in the same manner as in Reference Example 1 in the clay pot. In Reference Example 1, warpage occurred in a shape where the central portion of the heating plate for IH was raised during heating. However, when configured as in this reference example, warping during heating was suppressed, and cooking could be performed satisfactorily.
[0025]
Here, stainless steel is used as the second magnetic metal, but of course it is not limited to this. If a material such as iron with a thermal expansion coefficient close to that of Fe-Ni is used, the level of warpage during heating is further increased. Can be reduced.
[0026]
(Example 1)
FIG. 3 is a cross-sectional view of the main configuration of the IH heating plate showing Embodiment 1 of the present invention. Although it is the same structure as the reference examples 1 and 2 fundamentally, the temperature sensitive metals 2a and 2d and the aluminum 2b are used as a metal which comprises the heating plate for IH.
[0027]
And the heating plate for IH which made the Curie temperature of two thermosensitive metals different was created, and various cooking was performed. For example, if the Curie temperature of the temperature sensitive metal 2a is 95 ° C. and the Curie temperature of the 2d is 135 ° C., for cooking that needs to be boiled, the IH heating plate with the temperature sensitive metal 2d facing down It was possible to cook with sufficient boiling and without scorching. On the other hand, when cooking for a long time without boiling, for example, when simmering black beans, it can be heated for a long time without boiling regardless of the set thermal power by installing the thermosensitive metal 2a on the lower side, I was able to cook very deliciously. This kind of temperature setting allows you to keep warm for a long time without worrying about emptying when you keep warming other cooked dishes, so provide a safer heating method Can do.
[0028]
Thus, by using the temperature-sensitive metal having two Curie temperatures, cooking at a plurality of temperature settings can be performed safely with a single IH heating plate. The curie temperature can be set to about 100-150 ° C for stewed cooking, and the other is set to about 200-300 ° C for pottery cooking. It is possible to provide a comfortable and safe heating method without sticking, and without worrying about burning or igniting during cooking.
[0029]
In addition to the above-mentioned examples, these temperature settings can be arbitrarily set according to the application by adjusting the ratio of the temperature-sensitive metal Fe—Ni or by adding the third component. .
[0030]
(Example 2)
FIG. 4 is a cross-sectional view of a shape example of an IH heating plate showing Embodiment 2 of the present invention. Although cooking of oden was performed using the heating plate for IH processed into the shape of FIG. 4A, it was possible to cook efficiently without causing bumping phenomenon.
[0031]
This shape is not limited to FIG. 4 (a), but for example, as shown in FIG. 4 (b), the processing may be further simplified, or processing may be performed so that a space layer is formed only on the heating surface side to be used. You may do it.
[0032]
Further, bending the end surface of the IH heating plate in this way also has an effect of suppressing warpage during heating.
[0033]
(Example 3)
FIG. 5 is a plan view of a shape example of a heating plate for IH showing Embodiment 3 of the present invention. Oden cooking was carried out using the IH heating plate processed in such a shape, but none of them boiled at the time of heating, and the whole was uniformly heated by convection of bubbles at the time of boiling, and cooked well. I was able to. In particular, as shown in FIG. 5 (b), by making a hole in accordance with the center part (broken line) of the heating coil of the IH cooker, stronger convection was produced at the time of boiling, and cooking could be performed better. .
[0034]
(Example 4)
FIG. 6 is a cross-sectional view showing an example of the heating plate for IH in Embodiment 4 of the present invention. In the example of FIG. 6A, the temperature sensitive metals 2 a and 2 d having different Curie temperatures and the aluminum 2 b are joined by the brazing material 5. The area where the brazing material was applied was 10% of the total area, and the entire surface was heated and pressed by a high-frequency heating and pressure welding apparatus set to a temperature at which the brazing material was melted, so that only the brazing material application portion was bonded. Although the heating plate for IH created in this way was installed in a clay pot and heated, the warpage during heating could be reduced as compared with the case where the entire surface was joined.
[0035]
In FIG. 6 (a), the metal 2a, 2b and 2d are exaggerated so as to have a gap between them, but in reality, the gap cannot be visually confirmed. Moreover, even if a gap that can be visually confirmed is actually formed, if the gap is 1 mm or less, there is no problem in transmission of magnetic flux between the metals, and a predetermined self-temperature control function operates.
[0036]
The case of brazing has been described as a method for joining the respective metals constituting the heating plate for IH, but of course, the present invention is not limited to this. For example, as shown in FIGS. Any method can be used as long as each metal can be partially bonded, such as a structure in which both the temperature-sensitive metal and aluminum are caulked by forming one or more holes in the plate and pressing the whole.
[0037]
In addition, although the example of 10% of the total area of the joint area of each metal has been described, it is of course not limited to this, taking into account the thermal expansion coefficient, thickness and rigidity of each metal, and processing constraints. And can be set arbitrarily.
[0038]
Moreover, although the example which joins the center of the whole surface was demonstrated as a joining location of each metal, of course, it is not restricted to this, The effect can be acquired by joining partially in arbitrary locations.
[0039]
(Example 5)
7 is a cross-sectional view and a plan view of an IH heating plate according to a fifth embodiment of the present invention. The temperature-sensitive metals 2a and 2d having different Curie temperatures and the aluminum 2b are integrated by a stainless steel jig 7. Here, the metals are not individually bonded on the surface, but are integrated by caulking the jig 7 in the vertical direction. However, the gap between the metals is equal to or less than the gap through which the magnetic flux generated by the heating coil passes. Further, a space 8 is provided so that the end portion of each metal and the jig 7 are not in direct contact with each other, and the structure is configured to absorb the expansion difference of each metal.
[0040]
Although the heating plate for IH of such a structure was installed in the earthenware pot and it heated, compared with the structure which combined each metal completely or partially, there is almost no curvature at the time of heating, and it heats favorably I was able to.
[0041]
Also, the size of the gap between each metal was confirmed, but if it was 1 mm or less, the self-temperature control function of the temperature-sensitive metal worked.
[0042]
(Example 6)
FIG. 8 is a cross-sectional view and a perspective view showing an example of the sixth embodiment of the present invention. 9 is a non-metal pan for induction heating cooker, and a glass pan is used as a material. A hook 10 for fixing the IH heating plate 2 is formed on the bottom of the pan. Further, the end of the IH heating plate 2 has a notch. As shown in FIG. 8B, the notch is set in the hook 10 and the IH heating plate is rotated in the direction of the arrow. It becomes the composition fixed to the bottom of the pan.
[0043]
Oden was cooked in the pan having such a configuration, but cooking was good without the IH heating plate moving during cooking. In addition, in the case of empty baking, as in the previous examples, there was no unsafe condition such as ignition of cooked food.
[0044]
In this embodiment, the shape of the notch of the hook 10 and the heating plate is as shown in the drawing, but it is of course not limited to this, and any shape can be set as long as the heating plate can be fixed.
[0045]
(Example 7)
FIG. 9 is a sectional view of an IH heating plate showing Example 7 of the present invention. Here, a thermosensitive metal 2a, 2d and aluminum 2b having different Curie temperatures are integrated by a clad method. The Curie temperature of the temperature-sensitive metal 2a was 160 ° C., and the Curie temperature of the temperature-sensitive metal 2d was 260 ° C. Further, a step A having a constant height is provided at the end of the plate so that the cooked food on the heating surface is not spilled. In addition, a handle 11 with a height B that fits in the step at the end of the plate (thickness of the entire plate) is attached. Yes.
[0046]
The pottery was cooked with such a heating plate for IH. When the temperature-sensitive metal 2a having a low Curie temperature was placed below, cooking could be performed satisfactorily without scorching hot cakes or crepes. In addition, when the temperature-sensitive metal 2d having a high Curie temperature was placed below, it was possible to cook well even in menus that required cooking at high temperatures, such as steak and stir-fried vegetables. By using the heating plate having such a configuration, it was possible to cook safely in one heating plate without failing cooking in two types of temperature zones. Here, 160 ° C. and 260 ° C. are used as the Curie temperature of the temperature-sensitive metal, but of course, it can be arbitrarily set as required without being particular about this. In addition, the thickness of the handle attached to the end is adjusted to be within the thickness of the main body of the heating plate, and it has been devised so that it can be used without touching the handle no matter which side is up. You may adjust the relationship.
[0047]
In any of the embodiments, the operation temperature in the self-temperature control function has been described as being the same as the Curie temperature of the temperature-sensitive metal, but this relationship also varies depending on the main body characteristics of the IH cooker. Therefore, the Curie temperature may be set arbitrarily according to the characteristics of the target IH cooker.
[0048]
In each embodiment, the example in which each metal is used in an integrated state has been described. However, the heating plate may be coated with fluorine coating or the like. By applying the coating, the ease of use is greatly improved, such as less sticking to the food. Moreover, since the temperature of the heating plate of the present invention does not rise above a predetermined temperature, the durability of the coating is significantly improved than before.
[0049]
In addition, a coating with low heat resistance, for example, a monomolecular coating using a silane coupling agent, can be employed because of the temperature rise restriction during abnormal heating. Furthermore, the heating for the coating effect generally performed also becomes an aging effect to the heating plate body, and an effect of suppressing the warpage during use can be obtained.
[0050]
【The invention's effect】
As described above, according to the first to sixth aspects of the invention, in a non-metallic pan that could not be heated by an induction heating cooker, induction heating can be performed and a self-temperature control function can be provided. Thus, it is possible to provide a heating plate for an induction heating cooker and a non-metal pan for an induction heating cooker that prevent the occurrence of unsafe conditions such as overburning and ignition of the cooked food.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a heating plate for an induction heating cooker showing a first reference example of the present invention. FIG. 2 is a cross-sectional view of a heating plate for an induction heating cooker showing a second reference example of the present invention. FIG. 4 is a sectional view of a heating plate for an induction heating cooker showing a first embodiment of the present invention. FIG. 4 is a sectional view of a heating plate for an induction heating cooker showing a second embodiment of the present invention. FIG. 6 is a plan view of a heating plate for an induction heating cooker showing a third embodiment. FIG. 6 is a cross-sectional view of a heating plate for an induction heating cooker showing a fourth embodiment of the present invention. FIG. 8 is a cross-sectional view and a plan view of a heating plate for an induction heating cooker showing FIG. 8. FIG. 9 is a cross-sectional view and a perspective view of a non-metallic pan for induction heating cooker showing a sixth embodiment of the present invention. FIG. 10 is a sectional view of a heating plate for an induction heating cooker showing an embodiment of FIG. Sectional view showing the main structure of the induction heating cooker body [Explanation of symbols]
1 Non-metallic pan
2 Induction heating cooker heating plate 2a, d Magnetic metal having a predetermined Curie temperature 2b Non-magnetic metal (aluminum alloy)
2c Second magnetic metal (stainless steel)
7 Jig 9 Non-metallic pan (glass pan)
10 Hook 11 Handle

Claims (6)

With non-magnetic metal
A magnetic metal having two different predetermined Curie temperatures in which one Curie temperature is 100 ° C. or lower and the other Curie temperature is 100 ° C. or higher ;
Inductive heating is configured such that the nonmagnetic metal is integrated between the magnetic metals so as to have a self-temperature control function of different temperatures on both the back and the front and a space layer is provided between the bottom of the pan. Cooking plate for cooker.   The heating plate for an induction heating cooker according to claim 1, further comprising a hole for allowing bubbles such as water vapor generated on the lower surface of the plate to pass through.   The heating plate for an induction heating cooker according to claim 1 or 2, wherein only a part of the opposing surfaces of the magnetic metal and the nonmagnetic metal are combined.   The heating plate for an induction heating cooker according to any one of claims 1 to 3, wherein the magnetic metal and the nonmagnetic metal are sandwiched and fixed by a jig.   A pan having a self-temperature control function integrated with a structure in which the heating plate for an induction heating cooker according to claim 1 is detachably fixed to the bottom of the pan.   The heating plate for induction heating cookers according to any one of claims 1 to 4, wherein a handle thinner than the thickness of the entire plate is attached to an end of the heating plate for induction heating cookers.

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