JPH0461786A - Induction-heating cooking device - Google Patents

Abstract

PURPOSE:To suppress a temperature rise of a heating coil to the minimum by providing a fan which supplies air flowing from the inside part of a cylinder adjacent to the external peripheral part of a heating coil base via the center part of a heating coil to a gap between the heating coil and a ceramic plate. CONSTITUTION:A heating coil 3 to which high frequency current is supplied from an inverter circuit 8 generates heat due to induction-heating of a body 1 to be heated. And a fan attached to the side part of a cylinder 6 adjacent to the external peripheral part of a heating coil base 4 sends forth air to a discharge opening 7b from an intake opening 7a. Air supplied from a fan 7 proceeds from the bottom of the cylinder 6 in the direction shown by the dotted arrow. Thus the air cools firstly the underside of the heating coil 3, and secondly proceeds to the center part, and thirdly to the upper side of the heating coil 3, and lastly is exhausted to the outside through the mesh part of a cabinet 5. Consequently the temperature rise of the heating coil 3 can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an induction heating cooker having a feature of cooling a heating coil.

(Conventional Techniques) Conventionally, a method for cooling a heating coil of an induction heating cooker was as shown in FIG.

In the figure, 11 is an object to be heated, 12 is a ceramic plate, 13 is a heating coil for induction heating the object to be heated 11,
14 is an inverter circuit that supplies high frequency current to the heating coil 13, and 15 is a fan that cools the heating coil. In the figure, the direction of the air supplied by the fan is indicated by a broken line.

Next, its operation will be explained. The heating coil 13 supplied with a high frequency current from the inverter circuit 14 inductively heats the object 11 to be heated. At this time, since a high frequency current flows through the heating coil 13, Joule heat is generated due to the resistance of the heating coil 13, and the heating coil 13 generates heat. In order to suppress this heat generation, air is supplied from the fan 15, and the air flows from the left end 13a of the heating coil to the right end 13b as shown by the broken line, thereby cooling the heating coil 13.

(Problems to be Solved by the Invention) However, in the conventional heating coil cooling method described above, since the heating coil is cooled from the lateral direction, there is a drawback that the cooling is unevenly performed. That is, in FIG. 4, the cooling condition of the right end 13b of the heating coil is worse than that of the left end 13a of the heating coil, so the temperature of this part is higher than that of the left end 13a of the heating coil, and in general, the center of the heating coil is higher than the other parts. However, since the temperature is high, the temperature at the center becomes even higher. If the insulation coating of the wire of the heating coil 13 is torn as a result of the temperature of the heating coil 13 rising, a short circuit will occur inside the heating coil 13 to which high voltage is applied, which may lead to smoke and ignition, which is very dangerous. 9 In addition, this drawback is caused by the heating coil having a large number of turns in order to heat an aluminum pot, and in the case of an induction heating cooker with a high inverter operating frequency, the temperature of the heating coil becomes extremely high. It becomes dangerous.

An object of the present invention is to provide a safe induction heating cooker by eliminating the conventional drawbacks and minimizing the temperature rise of the heating coil.

(Means for Solving the Problems) The means of the present invention for solving the above-mentioned conventional problems includes a ceramic plate, a heating coil installed at the bottom of the ceramic plate, and an inverter circuit that supplies high-frequency current to the heating coil. a heating coil stand that fixes the heating coil; a cylinder installed at the bottom of the heating coil stand and in close contact with the outer periphery of the heating coil stand; It has a fan that supplies air to the gap between the plate and the plate.

(Function) By having the above configuration, the present invention allows the air supplied by the fan to pass through the cylinder and uniformly hit the lower surface of the heating coil, and further concentrates the air at the center of the heating coil where the temperature is higher than other parts. The heating coil can be efficiently cooled because it passes through and enters the gap between the top surface of the heating coil and the ceramic plate.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the electromagnetic cooker of the present invention viewed from the side. In the figure, 1 is an object to be heated, 2 is a ceramic plate, 3 is a heating coil for inductively heating the object to be heated 1, and 4 is a heating coil stand for fixing the heating coil 3, which is attached to the housing via a heating coil stand support 4a. It is in contact with 5. 6 is heating coil stand 4
A cylinder 7, which is in close contact with the outer periphery of the fan, is a fan attached to the side of the cylinder 6, which sends air from the suction lower a to the discharge lower b. The casing 5 supports the ceramic plate 2, and although not particularly shown in the figure, the portion above the heating coil support 4a has a mesh structure so that the air supplied from the fan 7 can escape to the outside. 8 is an inverter circuit that supplies high frequency current to the heating coil 3. Note that the dashed arrows shown in the figure indicate the flow of wind. Further, as the fan 7, a sirocco fan is used to obtain a sufficient amount of air.

FIG. 2 is a top view of the heating coil stand 4 in FIG. 1. Since it has a hollow structure as shown in FIG. Can be directly cooled.

FIG. 3 is a top view of the section taken along line AA' in FIG.

Next, the operation of this embodiment will be explained using FIG.

The heating coil 3 supplied with a high frequency current from the inverter circuit 8 inductively heats the object 1 to be heated. At this time, the heating coil 3 generates heat. The wind supplied by fan 7 is yen WJ
6, proceed in the direction indicated by the dashed arrow. As shown by the broken line, the heat is first cooled from the bottom surface of the heating coil 3, then advances to the center, then to the top surface of the heating coil 3, and is discharged to the outside through the mesh portion of the casing 5.

(Effects of the Invention) By using the configuration of the present invention, the heating coil can be efficiently cooled. Therefore, the temperature rise of the heating coil can be suppressed to a minimum, and it is possible to provide a safe induction heating cooker in which there is no fear that the heating coil will smoke or catch fire due to the temperature rise.

Further, by using the configuration of the present invention, it is possible to cool even a device in which the humidity of the heating coil becomes extremely high, such as an induction heating cooker that heats an aluminum pot, and the practical effect thereof is great.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an induction heating cooker according to an embodiment of the present invention, FIG. 2 is a plan view of the heating coil stand of FIG. 1, and FIG. The plan view and FIG. 4 are explanatory diagrams of a conventional induction heating cooker. 1... Heated object, 2... Ceramic plate, 3
...Heating coil, 4...Heating coil stand, ], 4a
...Heating coil stand support, 5...Housing, 6...Cylinder, 7...Fan, 7a...Suction port,
7b... Outlet port, 8... Inverter circuit. Patent applicant: Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] a ceramic plate, a heating coil installed at the bottom of the ceramic plate, an inverter circuit that supplies a high frequency current to the heating coil, a heating coil stand for fixing the heating coil, and a heating coil stand installed at the bottom of the heating coil stand, and a cylinder that is in close contact with the outer periphery of the heating coil stand, and a fan that supplies air from inside the cylinder through the center of the heating coil and into the gap between the heating coil and the ceramic plate. Heating cooker.