JPH0526318B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a method for induction heating an object placed on a top plate using a high frequency magnetic field output from a heating coil. Regarding the electromagnetic cooker.

(Prior Art) Conventionally, in an electromagnetic cooker, an object to be heated, such as an iron pot, is placed on a top plate, and the object to be heated is heated by induction using a high-frequency magnetic field output from a heating coil. ing.

By the way, the heating coil of such an electromagnetic cooker is usually constructed by bundling a plurality of thin coil wires so as to minimize high frequency loss.

Conventionally, as shown in FIG. 6, such thin coil wires are made by covering the outer peripheral surface of a conductor wire b with nickel plating a with an electrically insulating layer c made of polyimide, polyamide or polyester resin. The heating coil is made by twisting dozens of enameled wires together.

(Problem to be Solved by the Invention) However, in such a heating coil, the insulating layer c is only one layer, and the insulating layer c made of polyimide, polyamide, or polyester resin easily deteriorates at high temperatures and has poor heat resistance. There are some disadvantages.

For this reason, the heating coil is disposed below the top plate with a gap between it and the bottom surface of the top plate, so that the heating coil itself is not affected by heat from the object to be heated on the top plate. This is done to prevent thermal insulation deterioration of the insulating layer c.

By the way, when using an electromagnetic cooker, the temperature of the iron plate during teppanyaki cooking, which is a typical high-temperature cooking process, reaches 250°C, so the above-mentioned measures to prevent insulation deterioration are always necessary.

However, in this configuration in which the heating coil is disposed below the top plate with a certain gap, the magnetic field output from the heating coil toward the top plate is attenuated, resulting in a decrease in thermal efficiency. Problems remained, such as the need for a gap, which made the electromagnetic cooker larger.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic cooker that can be miniaturized as a whole and that can improve thermal efficiency.

[Structure of the invention]

(Means for Solving the Problems) The electromagnetic cooker of the present invention is configured to induction-heat an object placed on a top plate using a high-frequency magnetic field output from a heating coil. The thin coil wire of the coil is coated with a first layer made of borosiloxane resin on the outer peripheral surface of the conductor wire.
The heating coil is characterized in that it is double coated with an insulating layer and a second insulating layer made of an organic polymer, and the heating coil is disposed in contact with the lower surface of the top plate.

(Function) According to the above means, the coil thin wire of the heating coil is double coated with the first insulating layer made of borosiloxane resin and the second insulating layer made of organic polymer on the outer peripheral surface of the conductor wire. This configuration improves the heat resistance of the heating coil itself, and as a result, there is no problem of insulation deterioration due to heat, and even if the heating coil is directly attached to the bottom surface of the top plate, insulation deterioration due to heat of the heating coil will not occur. does not occur at all.

In the above means, by disposing the heating coil in contact with the lower surface of the top plate,
There is no gap between the top plate and the heating coil, and it is possible to improve thermal efficiency while eliminating insulation deterioration due to heat.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 2 shows the overall configuration of the heating coil 1. As shown in FIG. 3, this heating coil 1 is constructed by twisting (bundling) several dozen thin coil wires 2 and winding the bundled wires 3 in a spiral shape along the horizontal direction.

The structure of the thin coil wire 2 is shown in FIG. That is, this coil wire 2 has a conductor wire 5 whose outer circumferential surface is coated with nickel plating 4, and the outer circumferential surface of the conductor wire 5 is coated with a first insulating layer 6 made of a borosiloxane resin having high heat resistance. The outer peripheral surface of the first insulating layer 6 is overcoated with a second insulating layer 7 made of an organic polymer that also has high heat resistance, thereby providing a double insulating coating structure.

As shown in FIGS. 4a and 4b, such a heating coil 1 is mounted on a top plate 8 by means of a coil support 9.
It is placed in direct contact with the lower surface of the holder.

By the way, conventional heating coils had a problem of low heat resistance, but this embodiment can improve this problem.

That is, in this embodiment, the thin coil wire 2 is
The outer circumferential surface of the conductor wire 5 is double-coated with a first insulating layer 6 made of borosiloxane resin, which exhibits extremely high heat resistance, and a second insulating layer 7 made of an organic polymer. , the thin coil wire 2 has high electrical insulation and high heat resistance at the same time. That is, the heat resistance of the heating coil 1 itself can be dramatically improved. By the way, the temperature of the griddle (the object to be heated) during teppanyaki cooking, which is a typical high-temperature cooking, reaches 250℃.
On the other hand, it is possible to set the heat resistant temperature of the heating coil 1 to a sufficiently higher temperature. As a result, as shown in FIG.
Even when the heating coil 1 is directly attached to the top plate 8 without a gap, insulation deterioration due to heat of the heating coil 1 can be eliminated. Therefore, it is possible to sufficiently downsize (thin) the entire electromagnetic cooker, and to improve thermal efficiency.

In the above embodiment, the heating coil 1 is disposed on the lower surface of the top plate 8 via the coil support 9, but this is different from the configuration shown in FIG. 5 as a second embodiment of the present invention. Alternatively, the heating coil 1 may be disposed on the lower surface of the top plate 8 using an adhesive 10. In short, the heating coil 1 may be disposed so as to be in contact with the lower surface of the top plate.

〔Effect of the invention〕

As is clear from the above description, the present invention is directed to induction heating of an object placed on a top plate by a high frequency magnetic field output from a heating coil. The thin wire is constructed by doubly coating the outer peripheral surface of the conductor wire with a first insulating layer made of a borosiloxane resin and a second insulating layer made of an organic polymer, and the heating coil is attached to the bottom surface of the top plate. The heating coil is characterized by being placed in contact with the heating coil, which dramatically improves the heat resistance of the heating coil, making it possible to reduce the overall size and improve thermal efficiency. It has an excellent effect of obtaining.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a cross-sectional view of a thin coil wire, FIG. 2 is a plan view showing the entire heating coil, and FIG. FIG. 4a is a sectional view taken along line A-A, FIG. 4a is a plan view showing a fixed state of the heating coil, and FIG. 4b is a longitudinal sectional side view of the heating coil. FIG. 5 is a diagram showing a second embodiment of the present invention, and FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional example. In the figure, 1 is a heating coil, 2 is a thin coil wire, and 5 is a heating coil.
1 is a conductor line, 6 is a first insulating layer, 7 is a second insulating layer, and 8 is a top plate.

Claims (1)

[Claims] 1 In a device in which an object to be heated placed on a top plate is inductively heated by a high-frequency magnetic field output from a heating coil, the thin wire for the coil of the heating coil is coated with a borosiloxane-based material on the outer peripheral surface of the conductor wire. It is characterized in that it is double coated with a first insulating layer made of a resin and a second insulating layer made of an organic polymer, and the heating coil is disposed in contact with the lower surface of the top plate. Electromagnetic cooker.