JP3008048B2 - Induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction heating cooker, and more particularly, to an electromagnetic induction heating cooker provided with a cooking plate which can be placed on a dining table or the like to heat and keep food while eating. The present invention relates to an induction heating cooker.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional electromagnetic induction heating cooker. In the figure, 1 is a main body, 2 is a cooking container made of, for example, a magnetic material having a large resistivity and a high relative permeability, and 3 is a mounting table on which the cooking container is placed, and is a heat-resistant and glass-ceramic that transmits electromagnetic waves. It is comprised with materials, such as. As shown in FIG. 5, reference numeral 4a denotes an induction heating coil which is in close contact with each other and is formed in a spiral shape. Reference numeral 5 denotes a support for fixing the induction heating coil 4a with an adhesive, and leads of the induction heating coil 4a by radiant heat from the cooking vessel 2. Is supported at a position several millimeters away from the mounting table 3 in order to prevent deterioration of the mounting table 3. Reference numeral 6 denotes a high-frequency switching drive circuit for supplying electricity to the induction heating coil 4a, and reference numeral 7 denotes an operation unit provided with a controller, operation switches, and a display of the high-frequency switching drive circuit 6.

In the conventional electromagnetic induction heating cooker constructed as described above, the cooking vessel 2 containing the cooking material is placed on the mounting table 3 and the high frequency switching drive circuit section 6 applies a high frequency of 20 to 30 KHz to the induction heating coil 4a. When an electric current is applied, an eddy current is generated on the surface of the cooking container 2, and the cooking container 2 generates heat by Joule heat due to the eddy current, so that the cooking material is cooked.

[0004]

As described above, in the conventional electromagnetic induction heating cooker, the mounting table 3 uses glass ceramic. This glass ceramic has a higher thermal conductivity than other insulating materials and is excellent in heat resistance, so that it is a material suitable for the mounting table 3 of the electromagnetic induction heating cooker. However, the material was inferior in impact resistance, expensive and poor in workability. Further, in order to form the induction heating coil 4a in close contact with each other to form a spiral shape, the induction heating coil 4a is wound by a winding jig, an adhesive is applied, heat-cured, and then fixed to the support 5. Since the steps were taken, the production of the induction heating coil 4a took a lot of trouble.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. An electromagnetic induction heating cooker which is inexpensive and has excellent heat resistance and impact resistance while improving the workability of an induction heating coil is provided. It is intended to provide.

[0006]

SUMMARY OF THE INVENTION An electromagnetic induction heating cooker according to the present invention has a support having a spiral groove on a lower surface and made of a thermoplastic resin, and is provided in the groove of the support. And a heat-resistant protective plate adhered to the upper surface of the support, and a cooking container made of a magnetic material and placed on the protective plate. The support is made of a thermosetting resin.

[0007]

The cooking container is placed on the protective plate and the power is turned on. The induction heating coil constituting the heating means is energized to generate heat in the cooking container. Then, the cooking material in the cooking container is cooked by heating. At this time, the protection plate having excellent heat resistance and impact resistance protects the support and the induction heating coil from radiant heat and impact of the cooking vessel.

[0008]

[Embodiment 1] FIG. 1 is a configuration diagram showing a cross section of a main part of an embodiment of the present invention. In the drawing, reference numeral 2 denotes a cooking vessel such as a hot plate made of a magnetic material having a large resistivity and a high relative permeability, 4 an induction heating coil, 8 a support for supporting the induction heating coil 4, for example, an inorganic material. It is made of a thermoplastic resin such as mixed polyamide or polyphenylene sulfide-based resin (hereinafter referred to as PPS-based resin). Are formed.
Reference numeral 9 denotes a protective plate for protecting the support 8 disposed on the upper surface of the support 8 with an adhesive 10 from radiant heat generated by the cooking vessel 2.
For example, the cooking container 2 is made of a silicone-based mica laminated plate, heat-strengthened glass, or a glass cloth silicone laminate plate.

By the way, when the cooking is carried out by directly placing the cooking vessel 2 on the support 8 without the protection plate 9, the support 8 is affected by the heat from the cooking vessel 2 and the induction heating coil 4. In particular, heat transfer and radiant heat from the cooking vessel 2 having a large heating area reaching about 280 ° C. have a large influence, and the support 8 made of a PPS resin having a heat-resistant temperature limit of 260 ° C. is used for cooking as shown in FIG. A gap H (for example, 6
mm).

On the other hand, the self-heating of the induction heating coil 4 is 15
The support 8 made of a thermoplastic resin having a temperature of about 0 ° C. and having a heat resistant temperature limit of the PPS resin is sufficient. For this reason, a heat-resistant protective plate 9 is provided to protect the support 8 from the radiant heat of the cooking vessel 2. Also, the protection plate 9
Also has shock resistance.

The adhesive 10 is made of, for example, a heat-curable silicone rubber adhesive or the like, which buffers dimensional changes due to differences in the coefficient of thermal expansion of different materials, and improves the impact resistance by utilizing the properties of the rubber. ing.

Next, the operation of the present invention will be described.
First, when the cooking vessel 2 is placed on the protection plate 9 and the temperature is set at the operation unit and the power is turned on, a high-frequency excitation current of about 20 to 50 KHz flows through the induction heating coil 4. A magnetic flux is generated by excitation of the induction heating coil 4, and an alternating eddy current flows in the cooking container 2 due to an electromagnetic induction action to generate Joule heat, and the cooking container 2 rapidly generates heat. Next, the cooking ingredients are put into the cooking vessel 2 and cooking is performed while adjusting the heating temperature and the like. During cooking, the protection plate 9 protects the support 8 and the induction heating coil 4 from radiant heat and impact of the cooking vessel 2.

Embodiment 2 FIG. FIG. 3 is a sectional view showing a main part of another embodiment of the present invention in cross section. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the figure, reference numeral 11 denotes a support for supporting the induction heating coil, which is made of a thermosetting resin such as an inorganic-filled phenol resin, an inorganic-filled unsaturated polyester resin, or an inorganic-filled silicon resin. As in the case of the support 8 described in the first embodiment, a spiral groove 11a for disposing the conductor of the induction heating coil 4 is formed on the lower surface.

In this embodiment configured as described above, the cooking material in the cooking container 2 is cooked similarly to the operation described in the first embodiment. Protective plate 9 with excellent heat resistance during cooking
Protects the support 11 and the like from the high temperature of the heated cooking vessel 2.

[0015]

As described above, according to the present invention, a support having a spiral groove on the lower surface and made of a thermoplastic resin or a thermosetting resin, and a guide provided in the groove of the support are provided. Since a heating coil, a heat-resistant protective plate adhered to the upper surface of the support, and a cooking container made of a magnetic material and placed on the protective plate are provided, workability of the support is facilitated. The workability of the induction heating coil is improved, and the electromagnetic induction heating cooker excellent in heat resistance and impact resistance can be obtained by the protective plate adhered to the support.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a main part of an embodiment of the present invention in cross section.

FIG. 2 is an explanatory diagram showing a relationship between a cooking container and a support.

FIG. 3 is a configuration diagram showing a main part of another embodiment of the present invention in cross section.

FIG. 4 is a configuration diagram showing a cross section of a conventional electromagnetic induction heating cooker.

FIG. 5 is a plan view of an induction heating coil of a conventional electromagnetic induction heating cooker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Cooking container 3 Mounting table 4, 4a Induction heating coil 5, 8, 11 Support body 9 Protection plate 10 Adhesive

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-163284 (JP, A) JP-A-61-161687 (JP, A) JP-A-1-200589 (JP, A) JP-A 60-163 230393 (JP, A) Actually open 58-27893 (JP, U) Actually open 57-145295 (JP, U) Actually open 56-15592 (JP, U) Actually open 63-18791 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05B 6/12 305 A47J 37/06 321

Claims (5)

(57) [Claims] 1. A support having a spiral groove on a lower surface and made of a thermoplastic resin, an induction heating coil disposed in the groove of the support, and bonded to an upper surface of the support. An electromagnetic induction heating cooker comprising: a heat-resistant protective plate; and a cooking container made of a magnetic material and placed on the protective plate. 2. The electromagnetic induction heating cooker according to claim 1, wherein the thermoplastic resin of the support is made of one of an inorganic material-containing polyamide and a polyphenylene sulfide resin. 3. A support having a spiral groove on the lower surface and made of a thermosetting resin, an induction heating coil disposed in the groove of the support, and adhered to an upper surface of the support. An electromagnetic induction heating cooker comprising: a heat-resistant protective plate; and a cooking container made of a magnetic material and placed on the protective plate. 4. The thermosetting resin of the support is made of any one of an inorganic-filled phenol resin, an inorganic-filled unsaturated polyester resin, and an inorganic-filled silicon resin. An electromagnetic induction heating cooker as described. 5. The electromagnetic induction heating cooker according to claim 1, wherein the protection plate is made of any one of a silicone-based mica laminated plate, a heat-strengthened glass, and a glass cloth silicone laminate plate. .