JP5369459B2 - Clad pan for induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate resonance with a heating frequency which is generated from an induction heating cooker, and to prevent a metal sound from being generated in a clad pan which is used for a specified induction heating cooker. <P>SOLUTION: This clad pan which is equipped with a heating coil 3 and is used for the specified induction heating cooker is formed by press-working a non-magnetic material and a magnetic material. The diameter of the pan bottom 4 is made the same as the diameter of the heating coil 3. The outer shape of the clad pan is formed in a manner to extend in the approximately horizontal direction from a position which is raised by a step from the pan bottom 3, and to form a side surface section 7 through a curved surface section 6. By increasing the natural frequency of the pan in this manner, the resonance with the heating frequency being generated from the induction heating cooker is eliminated, and the metal sound is prevented from being generated. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a clad pan for an induction heating cooker used in an induction heating cooker.

In recent years, induction cooking devices have been widely used as cooking devices that do not use fire. Many pans have also been developed in which a magnetic material (eg, ferritic stainless steel) is joined to a nonmagnetic material (eg, aluminum) to enable induction heating.
Japanese Patent Laid-Open No. 2003-188792

  However, when the clad pan having the above configuration is heated by an induction heating cooker, there is a problem that a metal sound is often generated from the clad pan when heated with a high heating power (for example, 3000 W).

  An object of the present invention is to solve the problem of the metal sound of the conventional clad pan, and an object of the present invention is to provide a clad pan in which no metal sound is generated even when heated with high thermal power.

In order to achieve the above object, a clad pan for an induction heating cooker according to the present invention includes a main body constituting an outer shell, a top plate attached to an upper portion of the main body and on which a cooking container is placed, and below the top plate. A clad pan used in a predetermined induction heating cooker provided with a heating coil that is provided with a heating coil that supplies a high-frequency current to generate an induction magnetic field to inductively heat the cooking vessel, the clad pan on the inner surface side and a non-magnetic material and the outer surface magnetic material and the cladding material comprising the bonding to two layers of being formed by pressing, the diameter of the pan bottom of the clad pot, the diameter of the pre-Symbol heating coil, said cladding The outer shape of the pan extends in a substantially horizontal direction from a position raised by one step from the bottom of the pan, and forms a side surface portion through a curved surface portion.

  As a result, the natural frequency of the pan is increased, the resonance with the heating frequency generated from the induction heating cooker is eliminated, and the generation of metal sound can be prevented. Furthermore, since it is the shape extended in the substantially horizontal direction from the position raised one step, it is possible to ensure the capacity | capacitance of a pot enough, and it can make it substantially the same as the conventional pot also in appearance.

  According to the clad pan for an induction heating cooker of the present invention, it is possible to increase the natural frequency of the pan, eliminate the resonance with the heating frequency generated from the induction heating cooker, and prevent the generation of metal sound.

According to a first aspect of the present invention, a main body constituting an outer shell, a top plate attached to an upper portion of the main body and on which a cooking container is placed, and a high frequency current provided below the top plate are supplied to generate an induction magnetic field. A clad pan used in a predetermined induction heating cooker provided with a heating coil for inductively heating the cooking vessel, wherein the clad pan is formed by joining a nonmagnetic material on the inner surface side and a magnetic material on the outer surface side. the clad material as a two-layer is formed by pressing, the diameter of the pan bottom clad pot, the diameter of the pre-Symbol heating coil, the external shape of the clad pot, approximately from the position raised one step from the bottom of the pan It extends in the horizontal direction and forms a side surface portion through a curved surface portion.

  As a result, the natural frequency of the pan is increased, the resonance with the heating frequency generated from the induction heating cooker is eliminated, and the generation of metal sound can be prevented. Furthermore, since it is the shape extended in the substantially horizontal direction from the position raised one step, it is possible to ensure the capacity | capacitance of a pot enough, and it can make it substantially the same as the conventional pot also in appearance.

According to a second invention, in the first invention, the pan bottom of the clad pan is subjected to a punching process with a grid-shaped groove width of 0.2 mm and a groove depth of 0.2 mm. The natural frequency can be increased, the resonance with the heating frequency generated from the induction heating cooker is eliminated, and the generation of metal sound can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
In FIG. 1, the perspective view of the induction heating cooking appliance of the 1st Embodiment of this invention is shown.

  As shown in FIG. 1, the induction heating cooker according to the present invention includes a main body 1 constituting an outer shell, and a top plate 2 on which a cooking pan including a clad pan is mounted. ing.

  FIG. 2 is an exploded perspective view of the induction heating cooker according to the first embodiment of the present invention.

  As shown in FIG. 2, the heating coil 3 is installed below the top plate. Let the diameter of the heating coil be A.

  In FIG. 3, sectional drawing of the clad pan for induction heating cooking appliances of the 1st Embodiment of this invention is shown.

  As shown in FIG. 3, the diameter B of the pan bottom 4 is the same as the diameter A of the heating coil, and is provided with an outer peripheral pan bottom 5 extending upward by 1 to 3 mm and extending approximately 10 to 20 mm in a substantially horizontal direction. The side surface portion 7 is formed through the curved surface portion 6.

[Operation of induction heating cooker]
About the induction heating cooking appliance and the clad pan for induction heating cooking appliances which were comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When water and ingredients are put into a clad pan and cooked in an induction heating cooker, when high frequency power is supplied to the heating coil 3, the heating coil 3 generates an induction magnetic field, the pan bottom of the clad pan generates heat, and the temperature is increased. To rise.

  The high frequency generated from the induction heating cooker is about 21 kHz to 23 kHz. Moreover, although there are many natural frequencies of the pan in each frequency region, it has been verified by experiments and analyzes that there exists a natural frequency that works in the direction of twisting from the bottom of the pan to the side of the pan near 22 kHz. When this frequency resonates with the high frequency from the heating coil 3 of the induction heating cooker, a metallic sound may be generated. At this time, by changing the shape of the pan to lower or raise the natural frequency of the pan, it is possible to prevent the generation of metal sound.

Here, in order to lower the natural frequency of the pan, the strength of the pan bottom will be weakened (for example, the diameter of the pan bottom will be increased), but if the strength of the pan bottom is lowered, the temperature will rise due to baking, etc. Since there is a problem that warp sometimes occurs, it is not preferable.

  On the other hand, in order to increase the natural frequency of the pan, it is necessary to increase the strength of the pan bottom, and for that purpose, it has been shown from experiments and analysis results that it is most effective to reduce the diameter of the pan bottom. . However, if the diameter of the pan bottom is too small, the induction magnetic field is not efficiently transmitted to the pan, and problems such as difficulty in entering input power for heating occur. Therefore, by ensuring the minimum diameter necessary for the induction magnetic field to be efficiently transmitted to the pan, the diameter B of the same pan bottom 4 as the heating coil, induction heating is performed efficiently, and the natural frequency of the pan is set. It can be shifted by about 1 kHz to 2 kHz.

  Furthermore, after determining the diameter of the pot bottom 4 as described above, the capacity of the pot can be secured by increasing the area of the outer pot bottom 5. Experiments and analysis show that the natural frequency of the pan does not drop even if the diameter of the pan bottom 4 is constant and the diameter of the outer pan bottom 5 is increased, and the capacity of the pan can be reduced without reducing the natural frequency. Can be secured.

  By raising the natural frequency of the pan as described above, it is possible to prevent the high frequency from the heating coil 3 and the clad pan from resonating to generate metal sound.

(Embodiment 2)
In FIG. 4, the top view of the clad pan for induction heating cooking appliances of the 2nd Embodiment of this invention is shown.

  In FIG. 5, sectional drawing of the clad pan for induction heating cooking appliances of the 2nd Embodiment of this invention is shown.

  As shown in FIG. 4, the pot bottom 4 is increased in strength by performing a grid-like punching process 8 having a width of 0.2 mm and a depth of 0.2 mm on the pot bottom 4 to further increase the natural frequency of the pot from 500 Hz to 1 kHz. Can be raised. Thereby, the natural frequency of a pan can be raised and it can prevent that the high frequency from the heating coil 3 and a clad pan resonate, and a metal sound is generated. Further, the punching portion 8 is not limited to a lattice shape, but a circular or honeycomb shape can provide the same effect.

( Reference form 1 )
6 shows a first cross-sectional view of the induction heating cooker clad pot reference embodiment of the present invention.

Figure 7 shows a flat surface view of an induction heating cooker clad pot first reference embodiment of the present invention.

  As shown in FIG. 6, by providing the concave shaped part 9 having a diameter of 160 mm and a depth of 1 mm at the bottom of the pan, the strength of the pan bottom 4 can be increased and the natural frequency of the pan can be further increased by 500 Hz to 1 kHz. Thereby, the natural frequency of a pan can be raised and it can prevent that the high frequency from the heating coil 3 and a clad pan resonate, and a metal sound is generated.

  Since the clad pan for induction heating cooker according to the present invention can prevent the metal sound generated from the pan, in addition to the induction heating cooker for desktop use, the induction heating cooker for home use incorporated in a kitchen etc. Useful.

The perspective view of the induction heating cooking appliance in Embodiment 1 of this invention The exploded perspective view of the induction heating cooking appliance in Embodiment 1 of this invention Sectional drawing of the clad pan in Embodiment 1 of this invention The top view of the clad pan in Embodiment 2 of this invention Sectional drawing of the clad pan in Embodiment 2 of this invention Sectional drawing of the clad pan in the reference form 1 of this invention The top view of the clad pan in the reference form 1 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Top plate 3 Heating coil 4 Pan bottom 5 Outer pan bottom 6 Curved surface portion 7 Side surface portion 8 Punching processing portion 9 Concave shape portion

Claims (2)

A main body constituting the outer shell, a top plate attached to the upper portion of the main body and on which the cooking container is placed, and a high frequency current provided below the top plate to supply an induction magnetic field to induce the cooking container A clad pan used in a predetermined induction heating cooker provided with a heating coil for heating, wherein the clad pan is a clad formed by joining a non-magnetic material on the inner surface side and a magnetic material on the outer surface side into two layers Material is formed by pressing a diameter of the pan bottom of the clad pot, the diameter of the pre-Symbol heating coil, the outer shape of the clad pot, extends substantially horizontally from the position raised one step from the bottom of the pan, A clad pan for an induction heating cooker in which a side surface portion is formed through a curved surface portion. The clad pan for induction heating cookers according to claim 1, wherein a punching process is performed on the bottom of the clad pan so that a grid-shaped groove has a width of 0.2 mm and a groove depth of 0.2 mm.

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