JP2599661B2 - Induction heating range - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating range in which an electric heating type utilizing efficient induction heating is used instead of a gas heating type.

[0002]

2. Description of the Related Art Conventionally, a gas-heated range has been used as a heating source for various cooking and heating ranges in terms of thermal power and cost. In light of the above, restricting or reducing gas use, especially in high-rise and high-tech buildings,
In some buildings, no gas pipe is provided in the building itself, and there is a demand for an electric heating type and an efficient one instead of the gas heating type.

[0003] In a gas-heated range, 2
This, three, a plurality of rod-shaped or circular burners were used, but heating by such a burner, cooking utensils,
Only a part of the food can be heated, so the place and amount of the food placed on the cooking utensil is limited, which is inconvenient when having a large number of dinners, and the crater of the burner is hampered by the gravy generated from the food. There is a risk that clogging may occur and incomplete combustion may occur. Further, since the heating power is manually adjusted by the cock, fine heating power adjustment is impossible and inconvenient.

[0004]

SUMMARY OF THE INVENTION In the present invention, the heating source of the range is made of an electric heating type utilizing safe, convenient and efficient induction heating in terms of both safety and usability, and is heated by induction heating. It is an object of the present invention to provide an induction heating range in which radiant heat from the object to be heated is uniformly radiated to a cooking object, a cooking utensil or the like.

[0005]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned conventional technology, and in view of the problem that a gas-heated range has a danger, etc., the magnetic flux is contained in an outer case incorporated in a table having legs. By mounting an infix table with high transmittance, accommodating a red-hot radiator with high permeability and moderate resistance inside the infix table, and installing a work coil that generates an alternating magnetic flux outside the infix table In addition, the above-mentioned problem has been solved by using an electric heating type utilizing safe induction heating and radiating the radiation uniformly to the lower surface of a cooking product, a cooking utensil or the like by radiant heat.

[0006]

According to the present invention, when an alternating current is applied to the work coil, an alternating magnetic flux is generated, and the alternating magnetic flux penetrates the red-hot radiator to induce a very high-density eddy current to the red-hot radiator. The eddy current heats the red-hot radiator that is the object to be heated in a short time, radiates radiant heat from the red-hot radiator, and bake the food or heat the cooking utensil.

[0007]

To explain on the basis of an embodiment of EXAMPLES Hereinafter the present invention with reference to the drawings, 2 is oven body, the oven body 2, FIG.
As shown in 1, is incorporating table set write type to table 5 having a leg 4,4a ..., bite stove, pottery tone
In addition to use as a tool or substitute for a hot plate , the cooking unit is suitable for cooking pots because the height of the cooking unit is on the table 5.

Reference numeral 6 denotes an outer case which also serves as a drain pan . As shown in FIG.
7a are formed to protrude inward, and a flange 8 and an outer peripheral rising portion 9 are formed at the uppermost portion. The flange 8 forms a bearing step 10 in the outer case 6 .

Further , as shown in FIG. 1, a supporting step 10a of the outer case 6 is provided, an intermediate table 12 is erected, and a cooking utensil 18 is placed on the supporting step 10. not limited to this, as shown in FIG. 6, on the infix table 12, or trivet may be rests on 16, further lid to support stepped portion 10 (not shown) of the oven body 2 using Use it as a table when not in use.

Reference numeral 12 denotes a trumpet-shaped middle table.
The upper outer edge 13 is mounted on the support protrusions 7, 7a... Or the support step 10a of the outer case 6, or is mounted on the bottom of the outer case 6 (not shown). For example, a supporter 14 in the form of a squirrel or a net (a material having a high transmittance of the alternating magnetic flux B similar to that of the intermediate table 12 as described later) is provided, and the food W is placed on the support step 10 of the outer case 6. A cooking utensil 18 such as a net 15, a virtue 16, an iron plate or a rostelle 17 to be placed is mounted.

Reference numerals 19, 19a,...
The shape of the red-hot radiators 19, 19a... Is not particularly limited, but may be an integrally molded shape, a large pellet as shown in FIG. In the case of a box-shaped shape as shown in FIG. 4, it may be formed as high as shown by a dashed line in FIG. 4 . Since the vertical wall portion is close to the work coil 20 (described later), the heat generation efficiency is improved when the vertical wall portion is long, and an AC current (for example, a high-frequency AC current is more efficient around the lower portion of the intermediate table 12). Is provided, a work coil 20 that generates an alternating magnetic flux B when energized.

Reference numeral 21 denotes a control unit for induction heating. The control unit 21 is attached to the lower surface of the table 5 separately from the range body 2 by electric wiring and attached to the lower surface of the table 5, and the control unit 21 has an operation knob. In addition, the amount of heat generation of the object to be heated is set and controlled by changing the energization time, intermittently energizing, or changing the energizing state by current, frequency, or the like.

The intermediate table 12 serves as a container for the red-hot radiators 19, 19a,.
, And 19a... Serve as a heat insulating material between the work coils 20 which are desired to be cooled, and the material of the intermediate table 12 is a material through which magnetic flux is easily transmitted and electrically insulated in order to achieve the induction heating in the present application. It is a substance that does not react with the alternating magnetic flux B and does not generate heat. For example, an inorganic ceramic or the like, which is a material irrelevant to magnetism and that transmits the alternating magnetic flux B without any support, is used.

The red-hot radiators 19, 19a... Are materials having high magnetic permeability and moderate electrical resistance, and have a heat-generating effect when an eddy current S is generated by the alternating magnetic flux B. Iron, magnetic material such as SUS430, SUS30
4 non-magnetic material, or non-magnetic material, using a carbon material of a type of carbon material that has an appropriate resistance and generates heat with a magnetic material, there are various materials other than these, for example, Non-ferrous metals such as iron-based alloys, aluminum alloys, nickel-cobalt-based electromagnetic materials, Ti, Be, Pt, Au, Pd, and Ag.

Numeral 22 denotes a cylindrical internal ferrite core which is installed in place of the red-hot radiators 19, 19a... To be heated and housed in the intermediate table 12, and the internal ferrite core 22 has a high magnetic permeability and a high electric current. The inner ferrite core 22 itself does not generate heat.
The cooking utensil 18 on the upper part of the bearing step 10, the intermediate table 12 or the gotoku 16
When the pot M or the frying pan, the iron plate or the like to be heated is placed, the pot M itself generates heat.

Further, since the inner ferrite core 22 is not sufficient in strength, as shown in the figure, the sword 16 on which the pot M is placed is connected to the support step 10 of the outer case 6 or the upper outer edge 13 of the middle stand 12.
It is preferable that the material is provided on the upper side, and the material of the virtues 16 is a substance that does not generate heat, for example, an inorganic ceramic, and other materials such as aluminum, copper, and silver are desirable.

Reference numeral 23 denotes a blower provided at a lower portion of the base table 12. The blower device 23 includes a blower duct 24 and a blower fan 25. The outside air is blown, and the heated red heat radiators 19, 19a,... Are blown to the food W.

The outer case 6 and the like are not shown in the drawings in the configuration provided with the blower 23, the illustration of the induction heating system, and other configurations. For example, the bottom of the outer case 6 and the intermediate table 12 are not shown. A gap for installation of the blower 23 is provided between the lower portions of the radiators, and in such a configuration, as shown in the figure, a large number of small radiators are provided so as to increase the heat radiation area of the radiators 19, 19a. It is better to use 19, 19a ... to increase the surface area.

Reference numeral 26 denotes a reflector made of a non-magnetic material attached to the inner surface of the outer case 6. The reflector 26 prevents the alternating magnetic flux B from coming out of the range body 2 (outer case 6). The alternating magnetic flux B is efficiently transmitted to the glowing radiators 19, 19
a. If the outer case 6 is made of a magnetic material such as iron without the reflection plate 26, the alternating magnetic flux B reaches the outer case 6 to prevent the noise from leaking. 6 itself absorbs and generates heat, and the induction heating effect in the present application is reduced.

Reference numeral 27 denotes an external ferrite core provided between the outer case 6 and the intermediate table 12. The external ferrite core 27 guides the alternating magnetic flux B so as not to leave the work coil 20 and does not reach the outer case 6 or the like. , And easily reach the red-hot radiators 19, 19a,..., Thereby improving the efficiency and preventing noise leakage in the same manner as the reflection plate 26 described above.

The material of the red-hot radiators 19, 19a... (The object to be heated) depends on the characteristics of the material and the range body.
2 is selected according to the heating time, heat generation temperature and energization state, but is performed based on the following two-step calculation formula,
First, the power Pe absorbed by the red-hot radiators 19, 19a... Is calculated, and then the temperature rise value ΔT in the red-heat radiators 19, 19a.

[0022]

## EQU1 ## Pe = K (ρ × μ × f) ^1/2 × (N × I) ² Pe: Absorbed power of red-hot radiators 19, 19a... K: Constant (red-hot radiators 19, 19a... And work coil) 20
Ρ: Volume resistivity of the red-hot radiators 19, 19a ... (Ω ×
m) μ: Effective magnetic permeability of the red-hot radiators 19, 19a... f: Alternating magnetic flux frequency N: Number of turns of the work coil 20 I: Current of the work coil 20 Rs = K (ρ × μ × f) ^1/2 Rs: Red heat The skin resistance of the radiators 19, 19a... Is ² = (N × I) ² Is: the eddy current S generated in the red-hot radiators 19, 19a. In each case, the larger the numerical value, the higher the absorbed power.

[0023]

ΔT = (P × t / 4.186 × M × C) × (Δ / 100) where ΔT: temperature rise value of metal (red heat radiator 19, 19a...) (° C.) P: Inverter input (KW) (same as Pe above) t: Heating time (sec) M: Weight of metal (red hot radiator 19, 19a ...) C: Specific heat of metal (red hot radiator 19, 19a ...) (Cal / gr / ° C) ζ: Heating efficiency (%) Note) Metal weight M is density x volume Heating efficiency ζ is shape, material, heating temperature, heat radiation state, etc. of object to be heated (red heat radiator 19, 19a ...) Approximately 60-80%, depending on

A control section 21 is provided for controlling the temperature of the red-hot radiators 19, 19a (the object to be heated). , The temperature required for baking the food W is controlled.

As another temperature control method, for example, a metal to be heated has a limit point called a Curie point, and at such a Curie point, the absorbed power Pe of the red-hot radiators 19, 19a. Therefore, it is more difficult to raise the temperature of the object to be heated, for example, 770 ° C. for iron and 720 ° C. for carbon steel. If these materials are used, the red-hot radiators 19, 19a. , And is maintained at a constant temperature, so that safe cooking can be performed without performing inverter control and energization control for the work coil 20. The red-hot radiators 19, 19a,... Are formed of an alloy having a Curie point.

[0026] Next, to explain the action of the induction heating type oven according to the present invention, when applying a high frequency alternating current in the work coil 20 by the operation of the operation knob of the control unit 21, alternating magnetic flux B as shown in FIG. 2 Are generated, and the alternating magnetic flux B penetrates through the red-hot radiators 19, 19a,.
9a, and the surface of the object to be heated is heated in a short time by the eddy current S.

The red-hot radiators 19, 19a,.
The radiant heat is radiated in all directions, so that the cooking material W (including fish and shellfish) or the cooking utensil 18 on the net 15, gotoku 16 or rostrum 17
, The food W is baked and the air blower 23
Are blown by the blower fan 25 from below to the heated red-hot radiators 19, 19a,..., The air is heated and reaches the food W, and the food W is baked by convection heat.

Juice that may be generated when the food such as the food W on the net 15 is baked is the red hot radiator 1.
Even if it is dropped on 9, 19a ..., the juice is flipped off due to instantaneous generation of steam, and the red-hot radiators 19, 19a ... themselves are not stained and the temperature is prevented from lowering.

Further, the inner ferrite core 22 and the
In the case of pans and teppanyaki dishes, the cooking utensils 18 (pot M and others) which need to be heated are
As shown in FIG. 3 , the alternating magnetic flux B is guided through the inside of the internal ferrite core 22 to induce an eddy current S on the bottom surface of the cooking utensil 18 (the pan M or the like).
The food itself heats and cooks the food inside.

In the case of the range main body 2 provided with the reflecting plate 26, the alternating magnetic flux B generated in the work coil 20 is reflected by the reflecting plate 26 and is not absorbed by the outer case 6, so that the red-hot radiators 19, 19a If the heat generation efficiency is not reduced and the external ferrite core 27 is provided, the alternating magnetic flux B
Lead through the external ferrite core 27 so that the alternating magnetic flux B does not approach the outer case 6,
9a.. Are increased, and in these cases, noise due to the alternating magnetic flux B is not leaked to the outside.

[0031]

In short, the present invention has legs 4 , 4a,.
Induction heating because the outer case 6 is built into the table 5
In order to make the formula range a table built-in type, for home use,
It is easy to use and looks good when used for business use
And when not in use, set up the lid and attach it to the table
Can be used. Further, an in-place table 12 having a high magnetic flux transmittance is mounted in the outer case 6, and the red-hot radiators 19, 1 and 2 having a high magnetic permeability and an appropriate resistance are provided inside the in-place table 12.
9a are accommodated, and the work coil 20 for generating the alternating magnetic flux B is mounted outside the in-detachment table 12, so that the danger of explosion, poisoning, etc. due to the conventional gas can be eliminated by using the electric heating type. The electric control makes it easy to control the energized state and control the temperature, makes it possible to finely adjust the heating power, easily adjusts the heating power to obtain the optimal baking at the time of dinner, and also uses the radiant heat radiating in all directions 15, Wedoku 16 or cookware W or utensil 18 on rostrum 17
Can be heated uniformly, a large amount of cooked food can be cooked at a time at the time of placing the food W on the net 15, the rostral 17 or the cooking utensil 18 and baking, and furthermore, smoke from the heat source itself,
Since no exhaust gas is generated, the amount of smoke exhausted during cooking can be reduced, and the cooling and heating load in the store can be reduced .

[0032]

Since the red-hot radiators 19, 19a... To be heated are located at the center of the work coil 20, the alternating magnetic flux B efficiently penetrates the red-hot radiators 19, 19a. , The eddy currents S acting on the red-hot radiators 19, 19a... Are efficiently generated, and the heating of the red-hot radiators 19, 19a. 19, 19a ...), the stronger the surface is, the weaker it is generated inside. Therefore, if the frequency is increased (if high-frequency AC current is applied), the skin effect is further increased and the red-hot radiators 19, 19a ...
Can be increased, and the heat generation efficiency can be improved.

Further, since the blower 23 is provided below the intermediate table 12, the amount of heat generated from the red-hot radiators 19, 19a... Reaches the food W by radiant heat and convective heat, and is placed on the net 15. The placed food W is efficiently baked, or excess moisture, oil and the like of the food W are evaporated and absorbed by the convection of air to bake the food W juicyly.

Further, since the reflector 26 is attached to the inner surface of the outer case 6 and the external ferrite core 27 is provided at the intermediate portion between the outer case 6 and the intermediate table 12, the alternating magnetic flux B is reflected or guided to radiate the red heat radiator. 19, 19a... Can be efficiently generated, and at the same time, heat generation of the outer case 6 which is generated when no countermeasure is taken is prevented. ) Can be prevented from malfunctioning.

Also, since the red-hot radiators 19, 19a are formed in a pseudo-charcoal shape, when the red-hot radiators 19, 19a are heated from the surface and glow red, the visual appetite, high-class feeling peculiar to charcoal,
Excite the atmosphere and create a charcoal-grilled atmosphere.

An internal ferrite core 22 is provided in place of the red-hot radiators 19, 19a.
Since the cooking utensil 18 is attached to the upper part of the oven 2 , if a pot M, an iron plate, a frying pan and the like are placed via the gotoku 16, the range main body 2 can be used for various dishes such as grilled meat and a pan. The internal ferrite core 22 efficiently guides the alternating magnetic flux B to the pot M or the like, thereby increasing the heat generation efficiency.

Since the red-hot radiators 19, 19a,... Are formed of a material having a Curie point suitable for cooking,
Preventing excessive temperature rise, the red-hot radiators 19, 19a ... can be melted and ensure safety without falling,
The use of the low-temperature Curie-point red-hot radiators 19, 19a... Makes it possible to cook foods suitable for low-temperature heating.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a table built-in range according to the present invention .

FIG. 2 is a sectional view of a main part of a range showing an induction heating method according to the present invention.

FIG. 3 is a sectional view of a main part of a multipurpose range when a pan is placed.

FIG. 4 is a sectional view of a main part when the red-hot radiator has a pseudo-charcoal shape.

FIG. 5 Main parts when cookware is mounted on the bearing step
FIG.

FIG. 6 is a cross-sectional view of a main part when a cooking utensil is directly mounted on an in-place table.

FIG. 7 is a schematic plan cross-sectional view partially omitted from FIG. 4 ;

FIG. 8 is a perspective view of the pseudo-charcoal-shaped red-hot radiator shown in FIG. 4 ;

FIG. 9 is a sectional view of a main part of another embodiment.

FIG. 10 is a perspective view of the pseudo-charcoal shaped red-hot radiator of FIG. 9;

FIG. 11 is a sectional view of a main part of a range in which a blower is mounted.

[Explanation of symbols]

 4, 4a ... Legs 5 Table 6 Outer case 12 Intermediate table 18 Cookware 19, 19a ... Red heat radiator 20 Work coil 22 Internal ferrite core 23 Blower 26 Reflector 27 External ferrite core B Alternating magnetic flux S Eddy current

Claims (7)

(57) [Claims] 1. An outer case is mounted on a table having legs.
Seen, the magnetic flux transmittance within the outer casing is fitted with a high infix table, along with housing a glowing radiation having a permeability higher moderate resistance inside of the infix base, an alternating magnetic flux to infix stand outside An induction heating range characterized by mounting a work coil that generates. Wherein induction heating range according to claim 1, characterized in that a blowing device at the bottom of the infix stand. Wherein induction heating range according to claim 1 or 2, characterized in that attached to the inner surface of the outer casing reflector. 4. The method of claim 1 or 2 induction heating oven, characterized in that installed outside the ferrite core in the middle portion of the outer case and infix boards. 5. The induction heating range according to claim 1, 2, 3 or 4, characterized in that the red-hot radiator was form a pseudo-charcoal shape. 6. provided internal ferrite core in place of the red-hot radiator, according to claim 1, characterized in that the manner for mounting the outer case or infix stand cookware on top, 3 or 4 induction heating range . 7. The induction heating range according to claim 1, 2, 3, 4 or 5, characterized in that the formation of the red-hot radiator of a material having a Curie point suitable for cooking.