JP2639030B2 - Induction heating cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker for inductively heating a metal cooking container for cooking.

2. Description of the Related Art Conventionally, an inorganic plate such as crystallized glass, which is a heat-resistant electrical insulator, is used as a top plate of this type of induction heating cooker. Temperature is 400 ℃
Therefore, a ceramic plate is used, and the temperature of the cooking vessel is detected by a temperature detecting element provided on the back surface of the top plate.

Problems to be Solved by the Invention Conventionally, in a combination structure of a used top plate and a temperature detecting element, the temperature detection and extraction of a pan were poor. That is,
The pot placed on the top plate is directly heated by the eddy current flowing through the bottom of the pot by induction heating by the heating coil placed under the top plate. The climb is fast. Therefore, the conventional detection method for detecting the temperature of the back surface of the top plate cannot catch up with the rise in the temperature of the pan, and the temperature accuracy is poor. In other words, the temperature detection and extraction of the pan were not good, so the top plate required high heat resistance, and the pan was unnecessarily exposed to high temperatures when the pan was empty, causing deformation and the like. Further, it was difficult to control the temperature at a constant level, and the cooking performance in tempura cooking was particularly poor.

SUMMARY OF THE INVENTION In view of the above-described problems, a first object of the present invention is to increase the accuracy of temperature detection. A second object is to perform highly accurate temperature detection with a single temperature detection device. Further, a third object is to enhance the sealing performance of the heat transfer member embedded in the top plate to increase the temperature accuracy.

Means for Solving the Problems The induction heating cooker of the present invention is locally provided so as to penetrate in the thickness direction of a flat heat-insulating top plate on which an object to be heated to be heated by a heating coil is placed. A heat transfer member having good heat conductivity is embedded, the upper surface of the top plate and the upper surface of the heat transfer member are flush with each other, and a temperature detecting device is provided to detect the temperature from the back surface of the heat transfer member.

In addition, a heat transfer member having good heat conductivity is embedded locally so as to penetrate in the thickness direction of the flat heat insulating top plate on which the object to be heated by the heating coil is placed. The heat member is configured so that the lower part is thinner than the upper part, and a temperature detecting device is provided to detect the temperature from the back surface of the heat transfer member.

In addition, a first heat transfer member having good heat conductivity is locally provided at a plurality of locations so as to penetrate in a thickness direction of a flat heat insulating top plate on which an object to be heated by induction heating by a heating coil is placed. A second heat transfer member is provided on the back surface of the top plate so that the first heat transfer members embedded at a plurality of locations are thermally connected, and the temperature is detected from the back surface of the second heat transfer member. A temperature detecting device is provided in such a manner.

Operation The operation of the first technical means is as follows.

In other words, even if the object to be heated is induction-heated by the heating coil disposed under the top plate and the temperature of the pan rises quickly, the temperature of the pan quickly rises due to the heat transfer member embedded in the top plate. Heat is transferred to the sensing element, and high temperature accuracy is obtained.

Further, according to the second technical means, a plurality of first heat transfer members are arranged and a second heat transfer member is used to thermally connect the first heat transfer members to each other on the back surface of the top plate. As a result, high temperature detection accuracy can be obtained even when the pan is misaligned or misaligned, and the temperature detection device is attached to the second heat transfer member.
I can do it.

Furthermore, according to the third technical means, the gap 9 between the top plate and the heat transfer member can be filled with the sealing material, and the boiling juice on the top plate can be prevented from flowing out to the back side of the top plate.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, a metal heat transfer member 3 is provided in a thickness direction of a base plate 2 on which a pot 1 to be heated is placed.
The thermistor 5, which is a temperature detecting element, is supported by a holder 6 and is pushed up from below by a spring 7 so as to be in close contact with the heat transfer member 3. The holder 6 is preferably made of a material having poor heat conductivity, such as resin, in order to improve the heat conduction from above the thermistor 5.

In this case, the thermal conductivity is generally 11 (W /
(mK) and the heat transfer member 3 of aluminum is 230 (W / mK), so that the heat transmission from the pot is improved by about 20 times according to the configuration of the present invention as compared with the conventional configuration. Therefore, the temperature difference between the thermal responsiveness immediately after the start of heating and the pot bottom temperature at the time of stability is simultaneously improved.

In FIG. 1, a seal 4 made of silicone rubber or the like having elasticity and heat resistance is filled between the top plate 2 and the top plate 2. The thermal expansion coefficient of crystallized glass generally used for the top plate 2 is almost zero, whereas metals such as aluminum and copper having good heat conductivity have an expansion coefficient of 16 to 29 (× 10 ⁻⁶ ). This prevents a gap generated between the heat transfer member 3 and the top plate 2 due to expansion and contraction during long-time use, thereby preventing water from entering the inside of the machine body. In FIG. 1, the shape of the heat transfer member 3 is formed in an inverted conical shape that opens upward, and the hole shape of the top plate 2 is also formed in an inverted conical shape along with the shape of the heat transfer member 3, so that the seal 4 can be used in the event of any abnormality. Even if it does not function, the heat transfer member 3 is easily pushed downward by its own weight or the like, and naturally fills a gap between the heat transfer member 3 and the top plate 2.

FIG. 2 shows a further improvement in the temperature detection performance of the embodiment shown in FIG. In FIG. 2, a plurality of first
The first heat transfer member 3 has a second heat transfer member 3 fixed to the back surface of the top plate 2.
20 are thermally connected. Here, the thermistor 5 must be located at a position where the heat conduction from each of the first heat transfer members 3 can be equally obtained. In the embodiment of FIG.
Since there is not enough space between the first heat transfer member 3 and the top plate 2, the temperatures of the two first heat transfer members 3 are conducted by the second heat transfer member 20 and detected by the thermistor 5.

FIG. 3 shows another embodiment of the arrangement of the first heat transfer member 3 which is thermally symmetric. FIG. 3A shows that the width of the second heat transfer member 20 is changed by changing the width of the second heat transfer member 20 when the position of the heat transfer member 3 is not symmetrical with respect to the position of the thermistor 5 due to the shape of a pot or the like. The temperature is detected by one thermistor 5. FIG. 3 (b) is for adjusting the heat conduction characteristics when the air flows on the surface of the heating coil 10 due to cooling air or the like and the heat conduction from the two heat transfer members 3a and 3b is unbalanced. Although the shape of the second heat transfer member 20 may be changed as shown in FIG. 3A, in FIG. 3B the amount of heat transfer from the pot is corrected by changing the area of the heat transfer member 3b. (In FIG. 3b, since the heat transfer member 3b radiates more heat by wind, the amount of heat transfer is increased by the area.) Here, the second heat transfer member 20 is attached to the back surface of the top plate 2 with an adhesive. It may be attached, or may be pressed upward with a heat-insulating material or the like having poor heat conductivity.

Effect of the Invention As described above, according to the present invention, a heat transfer member is locally buried in the thickness direction of the top plate, and the heat sensitivity is improved by heat conduction to the thermosensitive element on the back surface of the top plate, and the temperature accuracy can be improved. .

Further, since the upper surface of the top plate and the upper surface of the heat transfer member are flush with each other, it is easy to perform cleaning such as spills.

Further, according to the present invention, a plurality of heat transfer members are arranged at arbitrary positions, and the heat transfer members are thermally coupled by the second heat transfer member on the back surface of the top plate, so that a single temperature detecting device can be used to set a pot at an arbitrary position. Temperature can be detected.

Further, in the present invention, since the accuracy of detecting the temperature of the pan is good, the heat resistance of the top plate and the pan can be lowered, and the safety can be further improved, and inexpensive materials can be used.

Further, by filling the sealing material between the top plate and the heat transfer member embedded in the top plate, it is possible to prevent the juice on the top plate from flowing out to the back surface of the top plate.

[Brief description of the drawings]

FIG. 1 is a sectional view of an induction heating cooker showing one embodiment of the present invention, FIG. 2a is a sectional view showing a second embodiment of the present invention,
FIG. 2B is a plan view showing the same, FIG. 3A is a plan view showing a third embodiment of the present invention, and FIG. 3B is a plan view showing a fourth embodiment of the present invention. 1 ... pan, 2 ... top plate, 3 ... heat transfer member, 4 ... seal, 5 ... thermistor, 10 ... heating coil, 20 ... second
Heat transfer member.

Claims (3)

(57) [Claims] 1. A heat transfer member having good heat conductivity is locally embedded so as to penetrate in a thickness direction of a flat heat insulating top plate on which an object to be heated by induction heating by a heating coil is placed. In addition, an induction heating cooker in which an upper surface of the top plate and an upper surface of the heat transfer member are flush with each other, and a temperature detecting device is provided to detect a temperature from a back surface of the heat transfer member. 2. A heat transfer member having good heat conductivity is locally embedded so as to penetrate in a thickness direction of a flat heat-insulating top plate on which an object to be heated by induction heating by a heating coil is placed. In addition, an induction heating cooker in which the heat transfer member is configured such that a lower portion thereof is thinner than an upper portion thereof, and further includes a temperature detecting device for detecting a temperature from a back surface of the heat transfer member. 3. A first heat transfer member having good heat conductivity is locally applied so as to penetrate in a thickness direction of a flat heat insulating top plate on which an object to be heated by induction heating by a heating coil is placed. At a plurality of locations, and a second heat transfer member embedded at the plurality of locations is provided on a back surface of the top plate with a second heat transfer member so as to be thermally connected.
An induction heating cooker provided with the heat transfer member described above and a temperature detecting device for detecting a temperature from the back surface of the second heat transfer member.