JPH0231756Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is an induction heating cooker that uses the heating coil to cook an object to be heated, such as food in a cooking pot, by supplying high-frequency power to the heating coil. Regarding.

(B) Prior Art A conventional induction heating cooker will be explained based on FIG. 1. First, 1 is the cooker main body;
A cooking table 2 on which a cooking pot 3 as an object to be heated is placed is provided on the upper surface. The cooking table 2 is made of a material with low eddy current loss, such as glass or ceramic. A similarly annular heating coil 4 is provided below the cooking table 2 via an annular heat insulating material 5. The heat insulating material 5 has a size that covers the heating coil 4 and blocks heat conduction through the cooking table 2 of the cooking pot 3. The heating coil 4 generates a high-frequency magnetic field when supplied with high-frequency power, and the cooking pot 3 is heated by induction by this high-frequency magnetic field.
The food inside the pot is heated and cooked. Further, the heating coil 4 is connected to the bottom plate 1 of the cooking device main body 1.
It is fixed to the upper part of a heating coil holding stand 7 having legs 6 fixed to A. A circular mounting hole 8 is formed in the central opening of the heating coil holding base 7, and a bottomed cylindrical mounting member 9 to which a temperature sensor 10 is mounted is inserted into the circular hole 8 and supported. The temperature detector 1
0 detects the temperature of the cooking table 2 heated by heat conduction from the cooking pot 3, and when a predetermined temperature is detected, the supply of high frequency power is cut off. Reference numeral 11 denotes an electric circuit board fixedly supported on the bottom plate 1A of the cooking device main body 1.

With this configuration, the cooking table 2 is heated by the heat from the cooking pot 3, but since the heat insulating material 5 is provided, the heat is difficult to conduct to the heating coil 4. However, there was a problem in that the self-heated temperature of the heating coil 4 itself was not radiated and the temperature rose.

For this reason, it is conceivable to provide an air layer between the cooking table 2 and the heating coil 4 to allow air to flow, without providing the heat insulating material 5. However, with this configuration, since the air flows, the temperature detector 10 provided at the center of the heating coil 4 is also cooled, resulting in a drawback that temperature detection varies.

(c) Purpose In view of the above drawbacks, the present invention aims to provide an induction heating cooker that eliminates variations in temperature detection by a temperature detector that detects the temperature of the cooking table and ensures stable detection. purpose.

(D) Structure For this purpose, the present invention includes a cooking table on which an object to be heated is placed, an annular heating coil for induction heating the object to be heated, and a heating coil provided below the cooking table to remove heat from the object to be heated. A temperature sensor that detects the temperature of a cooking table heated by thermal conduction and is disposed at the central opening of the heating coil, and a temperature sensor that is annular surrounding the sensor and only near the center of the heating coil. and a heat insulating material provided between the cooking table and the coil.

(E) Embodiment An embodiment of the present invention will be described below in detail based on the drawings.
Note that the same reference numerals as in the conventional example indicate the same functions. Reference numeral 1 denotes a cooking device main body, and on the top surface of the main body 1 is a cooking table 2 on which a cooking pot 3, which is an object to be heated, is placed.
is provided. The cooking table 2 is made of a material with low eddy current loss, such as glass or ceramic. An annular heating coil 4 is disposed below the cooking table 2.
is provided. The heating coil 4 generates a high-frequency magnetic field when supplied with high-frequency power, and uses this high-frequency magnetic field to inductively heat the cooking pot 3, thereby cooking the food inside the pot. Further, the heating coil 4 is fixed to the upper part of a heating coil holding stand 7 having legs 6 fixed to the bottom plate 1A of the cooking device main body 1. A mounting circular hole 8 is formed in the central opening of the holding table 7, and a temperature sensor 10 is installed in the circular hole 8.
A cylindrical mounting member 9 with a bottom is inserted and supported. The temperature detector 10 detects the temperature of the cooking table 2 heated by heat conduction from the cooking pot 3, and cuts off the supply of high frequency power when a predetermined temperature is detected. Reference numeral 11 denotes an electric circuit board fixedly supported on the bottom plate 1A of the cooking device main body 1. Further, a side portion of the mounting member 9 is formed with a narrow diameter portion that fits into the mounting circular hole 8 of the holding base 7, and a wide diameter portion that fits loosely into the central opening of the heating coil 4, It has a generally cylindrical shape. The heat insulating material 5A has an annular shape, and the cooking table 2, the heat insulating material 5A, and the mounting member 9 surround the temperature sensor 10 provided in the central opening thereof. On the other hand, the heating coil 4 has a temperature distribution as shown in FIG. That is, the temperature increases from the periphery to the center of the coil 4,
The temperature is highest at a position approximately halfway between the center A and the peripheral edge, and the temperature decreases from the middle position to the center A. Therefore, the heat insulating material 5A is provided between the cooking table 2 and the heating coil 4 only in the vicinity of the center A where the temperature is relatively low, and is arranged so as to surround the temperature detector 10 as described above. The outer diameter of this heat insulating material 5A (from the center A) is 1/3 of the outer diameter of the heating coil 4 (also from the center A).
The following are desirable. Then, a space 12 is formed between the cooking table 2 and the coil 4 in the high-temperature part of the heating coil 4, so air can be blown into this space 12 by a blower (not shown), and the cooking pot Heat due to heat conduction from the heating coil 3 and self-heating of the heating coil 4 can be cooled by the blower.

(f) Effects As described above, the present invention eliminates variations in temperature detection by a temperature detector that detects the temperature of a cooking table heated by heat conduction from an object to be heated, and enables reliable and stable detection. Heat radiation from the heating coil and the cooking table can also be performed well. Furthermore, in terms of structure, this can be achieved by simply reducing the size of the heat insulating material in the conventional structure.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of a conventional induction heating cooker.
Fig. 2 is a longitudinal sectional front view of an induction heating cooker showing an embodiment of the present invention, Fig. 3 is a graph showing the heating coil and its temperature distribution, and Fig. 4 is a perspective view of the main parts showing an embodiment of the invention. Show the diagram. 2...Cooking table, 4...Heating coil, 5A...Insulating material, 10...Temperature detector, 12...Space.

Claims (1)

[Scope of utility model registration request] A heating coil holder having an annular heating coil on its upper surface, a cooking table for placing an object to be heated arranged above the heating coil at a distance from the heating coil, and a heating coil holding table provided with an annular heating coil on its upper surface; and a temperature sensor attached to a mounting member supported by the holding base so as to face the lower surface, and the cooking table is configured to send air from a blower in the interval, wherein the cooking table is located only in the vicinity of the center of the heating coil. An induction heating cooker characterized in that an annular heat insulating material surrounding the temperature sensor is provided between the temperature sensor and the heating coil.