JP2000311773A - Induction-heating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating tool that has not any possibility of causing damage due to excess heating, by providing a tool body having a storage in its lower part, a heater stored in the storage, and liquid filled into the storage, and floating the heater when liquid temperature excesses a prescribed temperature. SOLUTION: A tool body 11 is made of insulating material, has a bowl shape, and has a storage 11a in its lower part. A plate-shaped heater 12 is stored in the storage 11a, and liquid 13 is filled into the storage 11a. Because specific gravity of the heater is constant independently of temperature and specific gravity of the liquid 13 increases with increasing of temperature, the heater 12 is sinking at the bottom of the storage 11a at lower temperature, and floats to the ceiling side of the storage 11a at higher temperature. When a material to be cooked is put into this induction-heating tool 10 and the tool is placed on an induction heater E and operated, the heater 12 heats the liquid 13, heats and cooks the material to be cooked, and sinks at the bottom of the storage 11a. When the cooking is completed and moisture of the material to be cooked is evaporated, temperature of the liquid 13 rapidly rises, and the heater 12 floats to the ceiling side to reduce heating value to prevent overheating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating tool which is not extremely likely to overheat and cause fatal damage.

[0002]

2. Description of the Related Art Induction heating cookers for home use are becoming widespread.

This device incorporates an induction coil that generates an alternating magnetic flux of about several tens to several hundreds of kHz, and when a conductive heating tool having a predetermined magnetic permeability is mounted on a top plate, the heating element is heated by electromagnetic induction. The utensil itself generates heat, and the cooking material in the heating utensil can be heated and cooked. The heating tool generates an eddy current inside due to an alternating magnetic flux from the outside, and generates heat due to resistance loss due to the eddy current.

[0004]

According to the prior art, even if the cooking utensil contains sufficient moisture, the heating utensil may be heated when the cooking is completed and the moisture evaporates. There is a risk that the cooking material may rise sharply, scorching the cooking material, damaging the heating tool and making the whole unusable, which may cause a fire.

In view of the above-mentioned problems in the prior art, it is an object of the present invention to store the liquid and the heating element in the storage chamber of the tool main body, which may cause extreme overheating and cause fatal damage. There is no induction heating tool.

[0006]

According to a first aspect of the present invention, there is provided a tool body having a storage chamber at a lower portion, a heating element stored in the storage chamber, and a liquid sealed in the storage chamber. The gist is that the heating element floats when the temperature of the liquid becomes higher than a predetermined temperature.

The specific gravity of the liquid may increase as the temperature increases, and the specific gravity of the heating element may decrease as the temperature increases.

Further, the liquid can form a liquid surface in the storage chamber.

[0009]

According to the structure of the present invention, when the temperature of the liquid in the storage chamber is low, the heating element stored in the storage chamber of the tool body sinks in the liquid and is sufficiently discharged by the alternating magnetic flux from the lower induction heater. Can generate heat. On the other hand, when the temperature of the liquid becomes higher than the predetermined temperature, the heating element floats away from the induction heater, thereby suppressing the eddy current and suppressing self-heating, and the tool body may be extremely heated. Absent. The tool body is formed of an insulating material that does not generate heat due to an alternating magnetic flux from the outside or a conductive material having a low magnetic permeability.

[0010] The specific gravity of the liquid increases as the temperature increases, so that the heating element can be reliably floated.
Examples of such a liquid include sodium polytungstate known as a heavy liquid for specific gravity sorting of ore and coal, and the like.
Suspended heavy liquids made by suspending powders of various high specific gravity substances in water or oil can be used. Further, as the heating element, for example, an iron material having an internal space to adjust an apparent specific gravity or an aluminum material mixed with ferrite powder or the like to aluminum to increase magnetic permeability and electric resistivity can be used. .

[0011] A heating element whose specific gravity decreases as the temperature increases increases even when combined with a liquid whose specific gravity does not change.

When the liquid surface of the liquid is formed in the storage chamber, there is no possibility that the internal pressure of the storage chamber becomes unduly high even if the volume temperature expansion coefficient of the liquid is large. The surface of the liquid may be evacuated, or may be filled with a suitable inert gas or air.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

The induction heating tool 10 has a storage chamber 11a in the lower part.
And a heating element 12 stored in a storage chamber 11a, and a liquid 13 sealed in the storage chamber 11a (FIG. 1).

The tool body 11 is formed in a bowl shape from an insulating material such as glass, wood, or plastics, and the inside and outside surfaces are appropriately decorated. Also, the tool body 11
Has a double bottom with a storage chamber 11a formed at the bottom. The heating element 12 is formed in a plate shape and stored in the storage chamber 11a, and the liquid 13 is sealed so as to fill the storage chamber 11a.

The specific gravity d1 of the heating element 12 is constant irrespective of the temperature T (FIG. 2), and the specific gravity d2 of the liquid 13 increases as the temperature T increases. However, the horizontal axis in FIG.
The temperature T is shown, and the vertical axis shows the specific gravity d. That is, since the heating element 12 has a specific gravity d1> d2 at a low temperature of temperature T <T1, it sinks to the bottom of the storage chamber 11a, and has a specific gravity d1 <d2 at a high temperature of temperature T> T1. Floats on the ceiling side of the storage room 11a.

The induction heating tool 10 is mounted on a top plate of the induction heater E by charging a cooking material (not shown) (FIG. 1), and by operating the induction heater E, the heating element 12 generates heat by electromagnetic induction. Thus, the liquid 13 is heated, and the cooking material can be heated and cooked via the liquid 13. At this time, the heating element 12 sinks to the bottom side of the storage chamber 11a and is sufficiently close to the induction heater E (solid line in the figure).

When the cooking of the cooking material is completed and the moisture contained in the cooking material evaporates, the temperature T of the heating element 12 and the liquid 13 is rapidly increased by the heating element 12. Then, when the temperature T> T1, the specific gravity d1 <d2, and the heating element 12 floats on the ceiling side of the storage room 11a (a two-dot chain line in the same figure), and moves away from the induction heater E to rapidly generate heat. Can be reduced. In other words, the heating element 12 can effectively prevent the cooked cooking material from being scorched or the whole being overheated.

The induction heating tool 10 includes a heating element 12,
By appropriately setting the temperature T1 at which the specific gravity d1 of the liquid 13 becomes d1 = d2, it is possible to keep the cooked material at an appropriate temperature.

In addition, the induction heating tool 10 includes the tool main body 1.
1. By appropriately setting the shape of the heating element 12, the entire structure can be formed into an arbitrary shape. For example, the induction heating tool 10 may be formed in the shape of a Japanese- or Western-style dish, pot, iron plate for BBQ, pot-like, etc., in addition to the shape of a Japanese-style bowl.

The heating element 12 may be such that the specific gravity d1 decreases as the temperature increases. That is, the heating element 12 has a specific gravity d1> d2 at a low temperature, sinks to the bottom of the storage chamber 11a and generates heat, and at a high temperature a specific gravity d
1 <d2, and the heat can be suppressed by floating on the ceiling side of the storage room 11a.

[0022]

[Other Embodiments] A liquid 13 is stored in a storage chamber 11a.
3a may be formed (FIG. 3). In the storage chamber 11a, even if the volume temperature expansion coefficient of the liquid 13 is large, there is no possibility that an excessive pressure is generated inside. The heating element 12 at this time
Can float on the liquid surface 13a of the liquid 13 (the two-dot chain line in the figure).

The present invention can be applied not only to cooking but also to induction heating tools for any purpose such as metal melting.

[0024]

As described above, according to the present invention, by enclosing the liquid by storing the heating element in the storage portion of the tool body, the heating element floats when the temperature of the liquid becomes higher than the predetermined temperature. As a result, the amount of heat generated can be suppressed, so that there is an excellent effect that there is no possibility that the entire body will be damaged due to excessive heating.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the overall configuration in a longitudinal section.

FIG. 2 is an operation explanatory diagram.

FIG. 3 is a schematic explanatory view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Induction heating tool 11 ... Tool main body 11a ... Storage room 12 ... Heating body 13 ... Liquid 13a ... Liquid level

Claims (4)

[Claims] 1. A tool body having a storage chamber at a lower portion, a heating element stored in the storage chamber, and a liquid sealed in the storage chamber, wherein the heating element has a predetermined temperature of the liquid. An induction heating tool characterized in that it rises when it gets higher. 2. The induction heating tool according to claim 1, wherein the specific gravity of the liquid increases as the temperature increases. 3. The induction heating tool according to claim 1, wherein the specific gravity of the heating element decreases as the temperature increases. 4. The induction heating tool according to claim 1, wherein the liquid forms a liquid surface in the storage chamber.