JPH08106978A - High frequency induction heating cooker - Google Patents

Abstract

PURPOSE: To efficiently and uniformly generate a radiation heat light beam by using high frequency electric power by providing at least one or more slit holes, which are formed in a plane shape and practically arranged along the circumferential direction, in a metallic heating member. CONSTITUTION: Though a shape of a metallic heating member is not particularly limited, a diameter is 180mm, and a thickness is 0.5mm, and a width (t) of a metallic heating part 19 is almost 9mm, and a width (s) of slit holes 20 is almost 1mm, and a diameter (h) of a central hollowed-out part 21 is almost 40mm. This heating plate 6 is worked, for example, in a thickness of 0.5mm by performing hot rolling on a plate having a thickness of 1mm, and the slit holes 20 are formed by water jet work. Stainless steel of a nonmagnetic substance (such as SUS 304) or a magnetic substance is desirable as a material of the heating plate 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency electromagnetic cooker, and more particularly, to fish and shellfish, meat, vegetables, mushrooms,
The present invention relates to a high frequency electromagnetic cooker used for baking pizza, gratin and the like with radiant heat rays.

[0002]

2. Description of the Related Art Heretofore, charcoal fires using natural charcoal have been the best for grilled foods. For example, eel kabayaki does not have a good taste without charcoal. In addition to eel,
At top restaurants, fish, shellfish, meat, etc. are cooked over charcoal to give good taste. The reason why the charcoal fire is used is that the radiant heat from the infrared rays of the charcoal fire has excellent heat permeability to the food to be heated and can generate uniform heat. However, in order to generate uniform heat, charcoal obtained from hard wood such as oak is used, the arrangement of the charcoal fire is devised, and the smoke generated by the liquid dropped from the cooked material is removed by the fan during cooking. However, it was necessary to devise such as removing the ash generated on the surface of the charcoal fire, and many years of training and skill were required to become a top-class cook. Besides,
As good quality charcoal is difficult to obtain and the handling of charcoal itself is cumbersome, charcoal is becoming increasingly obsolete.

Further, in restaurants and homes where it is not required to give a first-class taste due to cost problems, a resistance electric oven is used for grilling, or gas is burned to heat a metal object, which is then reflected. It is common practice to bake food materials (foodstuffs) with heat.

[0004]

However, in the cooking using the resistance type electric oven, the calorific value is not so high, it takes a long time to cook, and the fire does not penetrate well into the food. was there. In addition, there is a problem in cooking by gas combustion that the fire does not pass well inside the food.

In order to solve the above-mentioned problems of the prior art, the present invention provides a high-frequency electromagnetic cooker excellent in heat uniformity capable of cooking a pottery using radiant heat rays including visible rays or infrared rays by using high-frequency power. To aim.

[0006]

In order to achieve the above object, a high frequency electromagnetic cooker according to the present invention includes a work coil for generating a high frequency, a metal heating member heated by an alternating magnetic field generated by the high frequency. A high frequency electromagnetic cooker comprising at least a means for insulating the work coil and the metal heating member, wherein the metal heating member is planar and at least one or more slit holes substantially along the circumferential direction. It is characterized by having.

In the above structure, it is preferable that there are a plurality of slit holes in the metal heating member, and that the slit holes have a discontinuous portion in part. Further, in the above configuration, it is preferable that the discontinuous portion of the slit hole exists at a position symmetrical with the discontinuous portion of the adjacent slit hole.

Further, in the above structure, it is preferable that the central portion of the metal heating member is hollowed out. Moreover, in the said structure, the metal heating member is 0.1-1 mm in thickness.
The non-magnetic material or the magnetic material of stainless steel is preferable.

Further, in the above construction, the heat generation temperature of the metal heating member is preferably in the range of 700 to 1000 ° C. Moreover, in the said structure, it is preferable that the heat generation of a metal heating member contains a visible light or infrared rays.

Further, in the above-mentioned structure, it is preferable that the generation frequency of the work coil is in the range of 20 to 30 kHz. Further, in the above configuration, the means for insulating the work coil and the metal heating member from each other includes a top plate on the work coil, a heat insulating material plate installed on the top plate via a spacer, the top plate and the heat insulating material. It is preferably constituted by means for blowing air into the gap with the plate.

[0011]

According to the present invention described above, at least a work coil for generating a high frequency, a metal heating member heated by an alternating magnetic field generated by the high frequency, and a means for insulating the work coil and the metal heating member are provided. A high-frequency electromagnetic cooker provided with the metal heating member, wherein the metal heating member is planar and has at least one slit hole substantially along the circumferential direction, so that visible light or infrared rays can be emitted using high-frequency power. It is possible to efficiently and uniformly generate the included radiant heat ray. That is, by forming the slit holes, even if the metal heating member is rapidly thermally expanded to a high temperature at which radiant heat rays are generated, the metal heating member does not undergo thermal deformation and can stably maintain a planar state. . Further, in the flat state, the radiant heat ray can be generated most efficiently. As a result, it is possible to provide a high-frequency electromagnetic cooker excellent in soaking property and suitable for grilled food cooking. Moreover, since electric power is used as an energy source, temperature control is easy, and the cooking environment can be markedly cleaner than that of charcoal or gas combustion.

According to the preferable example in which a plurality of slit holes of the metal heating member are present and the slit holes have a discontinuous portion at a part thereof, it is possible to further favor thermal expansion. In the above, the length of the discontinuous portion is preferably about 1 to 30% of the length of the slit hole. Further, the metal heating member can be formed so as to correspond to the work coil by the plurality of slit holes. The preferred number of slit holes is about 3 to 10 although it depends on the number of turns of the work coil.

Further, in the above, according to the preferable example in which the discontinuous portion of the slit hole exists at a symmetrical position with the discontinuous portion of the adjacent slit hole, deformation due to thermal expansion can be prevented and the strength can be maintained high.

Further, in the above, according to a preferable example in which the central portion of the metal heating member is hollowed, a portion where the work coil does not exist, that is, a portion which does not contribute to heating can be removed, and thermal deformation can be further prevented. .

Further, according to the preferable example in which the metal heating member is a non-magnetic or magnetic stainless steel having a thickness of 0.1 to 1 mm, the metal heating member is excellent in oxidation resistance at a high temperature, and is a food material or this. Even if various liquids (oils, seasonings, etc.) generated from materials related to (3) are brought into contact with each other at high temperature, they do not deteriorate and can be used stably for a long time. Also,
Since the radiant heat ray generated by the present invention requires a heat ray amount, the metal heating member does not need to have a large thickness, and a thickness of about 0.1 to 1 mm is sufficient. More preferably, the thickness is about 0.3 to 0.8 mm. Examples of stainless steel include austenitic stainless steel such as SUS304.

According to the preferable example in which the heat generation temperature of the metal heating member is in the range of 700 to 1000 ° C., radiant heat rays can be practically and sufficiently generated.
Further, in the above, according to a preferable example in which the heat generated by the metal heating member includes visible light or infrared rays, radiant heat rays including yellow, orange (red), etc. can be practically and sufficiently generated. That is, it can generate heat equal to or higher than that of a high-quality charcoal fire.

Further, in the above, according to the preferable example in which the generation frequency of the work coil is in the range of 20 to 30 kHz, radiant heat rays can be practically and sufficiently generated.
The input electric capacity is, for example, about 1.5 to 3.0 kw.

Further, in the above, the means for insulating the work coil and the metal heating member from each other includes a top plate on the work coil, a heat insulating material plate installed on the top plate via a spacer, a top plate and a heat insulating material plate. According to the preferable example in which the heating device is configured to blow air into the gap, the heating device can be operated efficiently and stably for a long period of time.

[0019]

EXAMPLES The present invention will be described in more detail below with reference to examples. FIG. 1 is a schematic view showing an embodiment of a high frequency electromagnetic cooker according to the present invention.

As shown in FIG. 1, a ceramic top plate 2 is fixed to the upper portion of the main body 1, and a high frequency power generator known to those skilled in the art is provided below the top plate 2. . Although the work coil 3 of the inverter is shown in FIG. 1 and other high-frequency power generators are omitted, the high-frequency power generator supplies AC power having a commercial wave number (50 Hz or 60 Hz) via an AC power source, It is converted into DC current, and high frequency power (for example, 25 kHz) is generated from the work coil 3 using an inverter and an output transformer to generate an AC magnetic field above the top plate 2. Here, the top plate 2 plays a role of protecting the inverter.

On the top of the top plate 2, 5-10 m
A heat insulating material 5 is provided through m-thick ceramic spacers 4 and 4, and a heating plate 6 is placed on the heat insulating material 5. As a result, an electromotive force is induced in the heating plate 6 by the action of the AC magnetic field generated above the top plate 2 by the work coil 3, and Joule heat is generated by the eddy current flowing in the surface layer, and the heating plate 6 is heated. It The heating plate 6 generates radiant heat rays including visible rays and infrared rays, and can cook fish and shellfish, beef and the like placed at a certain distance above the heating plate 6.

A cooling fan 7 is provided on the side of the heat insulating material 5 on the top plate 2, and cool air is sent between the heat insulating material 5 and the top plate 2 by the cooling fan 7. You can The cooling fan 7 functions to cool the heat radiated downward from the heat insulating material 5 and prevent the work coil 3 from reaching a high temperature. Therefore, the work coil 3 can be prevented from being damaged.
As described above, the work coil 3 is prevented from being damaged by the cooling fan 7, so that the work coil of the inverter can be protected without turning off the entire device as in the conventional case, so that the work coil 3 can be heated for a certain period of time. You can cook well if you need to.

The side wall 5a of the heat insulating material 5 has a diameter of 1.2 mm.
The aluminum coil is wound about 1 to 20 times to form the antenna coil 8. Thereby, the magnetic flux leaking around the heat insulating material 5 links the antenna coil 8 and an electromotive force is generated in the antenna coil 8, so that an alternating current can be obtained.

As shown in FIG. 2, the antenna coil 8 is connected to DC via a silicon rectifier 9 and a smoothing capacitor 10.
It is connected to the motor 11. In addition, in FIG.
Is a resistor for circuit protection.

With the above configuration, the alternating current obtained by the antenna coil 8 is converted into the silicon rectifier 9.
And full-wave rectified through the smoothing capacitor 10, 25
Since a direct current of ~ 30V can be obtained, the DC motor 1
1 can be driven to operate the cooling fan 7.
Of course, the cooling fan 7 may be connected to another power source.

As described above, since the cooling fan 7 is operated by utilizing the magnetic flux leaking around the heat insulating material 5, an external power source is not required. As a result, the power cord does not hang from the electromagnetic cooker, the appearance of the electromagnetic cooker becomes neat and the power can be saved. In addition, the power cord does not get in the way when cleaning the electromagnetic cooker, and it does not hinder the transportation to other places.

Although the cooling fan 7 is provided on the top plate 2 in this embodiment, the present invention is not necessarily limited to this structure, and the cooling fan 7 is provided on the lower side of the top plate 2. Alternatively, cold air may be blown between the top plate 2 and the work coil 3.

Further, in this embodiment, the antenna coil 8 is constructed by winding the aluminum wire around the side wall 5a of the heat insulating material 5 provided on the upper portion of the top plate 2, but it is not always limited to this construction. However, the antenna coil may be provided around the heat insulating material 5 independently of the heat insulating material 5. In this case, the metal heating member does not have to be in the shape of a container like the heat insulating material 5, but may be in the shape of a flat plate or a sheet, for example.

Further, in this embodiment, the cooling fan 7 is operated by utilizing the leakage magnetic flux, but the present invention is not necessarily limited to this configuration, and the periphery of the metal heating member and the cooling fan 7 are not limited to this. The cooling fan 7 may be operated by connecting the DC motor 11 via a thermocouple and adjusting the generated electromotive force to a drive voltage suitable for the DC motor 11. Further, the cooling fan 7 can be operated by using another external power source.

Next, FIG. 3 is a schematic view showing another embodiment of the high frequency electromagnetic cooker according to the present invention. The difference from FIG. 1 is the portion for sending out the cooling air. That is, the fan 13 is provided inside the main body 1 to cool the work coil 3, and at the same time, the cooling air is passed through the hood 15 from the cooling hole 14 formed at the end of the top plate 2 to pass through the top plate 2.
This is a part for cooling between the heat insulating material 5 and the heat insulating material 5.

Next, FIG. 4 is a schematic view showing still another embodiment of the high frequency electromagnetic cooker according to the present invention. 1 is different from FIG. 1 in that the fan 17 is placed laterally next to the heat insulating material plate 16, and the top plate 2 and the heat insulating material plate 16 are placed sideways.
It is about to cool between and. By doing so, the fan 17 does not interfere with cooking for the user, and the heating plate 6 becomes easy to see. The motor for rotating the fan 17 (not shown because it is thin) is more convenient for the user when placed downward. Also in this example,
The antenna coil is wound on the outside of the heating plate 6 and below the heat insulating material plate 5 for 5 to 6 times. Since the antenna coil is thin, it does not prevent the fan 17 from blowing air. The space (space) between the top plate 2 and the heat insulating material plate 16 is preferably about 5 mm.

In the above, as the heat insulating material plate 16, for example, an inorganic material heat insulating sheet such as a board made of fiberized silica ceramic such as Kao wool board (made by Isolite Industry Co., Ltd.) and Kao wool 1000 board (made by Isolite Industry Co., Ltd.) is used. Is preferred. In FIG. 4, 18 is a center spacer.

Next, FIG. 5 shows an embodiment of the heating plate 6 used in the embodiment of the present invention described with reference to FIGS. First, although the shape is not particularly limited, the diameter is 180 mm, the thickness is 0.5 mm, the width t of the metal heating portion 19 is approximately 9 mm, the width s of the slit hole 20 is approximately 1 mm, and the diameter h of the central hollow portion 21 is approximately 40 mm. . As the heating plate 6, for example, a plate having a thickness of 1 mm was purchased, hot-rolled to a thickness of 0.5 mm, and slit holes 20 were formed by water jet processing. Regarding the shape of the slit holes 20, six C-shaped slit holes and six inverted C-shaped slit holes were formed alternately. The island portion of the C-shaped slit hole was about 5 mm.

The material of the heating plate 6 is preferably non-magnetic or magnetic stainless steel. Non-magnetic stainless steel includes austenitic stainless steel such as SUS304. Examples of magnetic stainless steel include NA manufactured by Sumitomo Metal Technology Co., Ltd.
There are R160, FH-11, etc.

Next, FIG. 6 shows the shape of the heat insulating material plate 16. As the heat insulating material plate 16, as described above, kao wool board or kao wool 1000 board was used, and a square one having a thickness of 5 mm and a side of 240 mm was debindered and used. The binder removal treatment is performed to eliminate an offensive odor, and was performed by heat treatment at 700 to 800 ° C. Further, a hole 18 'through which the center spacer 18 is passed is formed in the center.

Next, FIG. 7 shows the wire mesh 2 on the heating device of FIG.
Place 3 (the distance between the wire net 23 and the heating plate 24 is about 20 ~
120 mm, about 80 mm for raw fish, about 20 mm for dry matter, 80-100 mm shellfish, 100-1 meat
20 mm is preferable), and the suction duct 22 is provided around the heating plate to actually cook the fish 24. The input capacitance is 200V, 2.2
The generation frequency of the work coil 3 was 25 kHz. Under this condition, the heat generation temperature of the metal heating plate 6 is about 1
It was possible to heat in the range of 795 to 810 ° C. in 30 minutes, and radiant heat rays including yellow, orange (red) and the like including visible rays or infrared rays were generated. The surface of the fish 24 was sufficiently heated to the inside without burning, and good cooking equivalent to or better than the case of using a high-quality charcoal was completed. The liquid 25 falling from the fish 24 boiled on the heating plate 6 and bounced off and was removed by the suction duct 22. Therefore, the metal heating plate 6 was not soiled. In addition to fish, I also cooked shellfish such as turban shells, crab, shrimp, eel, etc., but the outside did not burn or turn black, and the inside was sufficiently heated,
We were able to cook as good as or better than when using high-quality charcoal. I also tried grilling beef, chicken, yakitori, etc., but the surface did not burn, and the inside was heated sufficiently,
I was able to cook well. The above cooking was done by a first-class chef, but I was able to cook at the same level as or higher than charcoal fire. The heating plate 6 was repeatedly used for one month, but the heating plate 6 was not deformed or oxidized.

Next, by using the apparatus shown in FIG. 7, an experiment was conducted by heating water to find out specifically how much heat is generated. The pot used is a black pot with a black surface. Put 2 liters of water at 25 ° C. in this, change the position of the cradle to 20 mm and 80 mm above the heating plate 6, put a wire net on the cradle,
I put a pot on it. Then, heating for 10 minutes, the temperature of the heating plate 6, the temperature when stirring the water in the pan,
The temperature of the wire mesh was measured on the frame. As the heating plate 6, SUS304 stainless steel, NAR
160 stainless steel and FH-11 stainless steel were used, respectively. The above experimental results are shown in Table 1 (distance 20 mm) and Table 2 (distance 80 mm).

[0038]

[Table 1]

[0039]

[Table 2]

As is clear from Tables 1 and 2, it was confirmed that the heat power was strong. It was also found that rapid heating was possible. Next, FIG. 8 shows another embodiment of the present invention in which the work coil 3 and the top plate 2 are placed on the upper side, and the heat insulating material plate 16 and the heating plate 6 are installed above the heating box 26. Is. In this example, ingredients 28 such as gratin and pizza pie in the dish 27 are provided.
It is convenient for heating and baking.

Next, FIG. 9 shows another embodiment of the present invention, in which the work coil 3 and the top plate 2 are placed side by side in a pair, and a pair of heat insulating material plates 16 and heating are placed next to each other in the heating box 29. The plate 6 is installed. In this example, it is convenient to heat or bake a large food material 31 such as one chicken in the dish 30.

As described above, according to the high frequency electromagnetic cooker of the present embodiment, the work coil of the inverter can be protected without turning off the entire apparatus as in the conventional case, so that heating can be performed for a long time to some extent. You can cook well if you need to.

Further, in the present embodiment, an antenna coil for generating an alternating current due to the interlinkage of leakage magnetic flux is attached around the metal heating member, and the antenna coil is connected to a DC motor for a cooling device through a rectifying circuit. Preferable configuration of connection, or D for cooling device around metal heating element
According to the preferable configuration in which the C motor is connected via the thermocouple, no external power source for operating the cooling device is required, so that the power cord does not impair the appearance of the electromagnetic cooker. It can also contribute to power saving. Also, the power cord does not get in the way during cleaning, and it does not hinder the transportation to other places.

[0044]

As described above, according to the present invention, a work coil for generating a high frequency, a metal heating member heated by an alternating magnetic field generated by the high frequency, the work coil and the metal heating member are provided. A high frequency electromagnetic cooker including at least a heat insulating means, wherein the metal heating member has a planar shape and has at least one or more slit holes substantially along the circumferential direction. Radiant heat rays can be efficiently and uniformly generated. That is, by forming the slit holes, even if the metal heating member undergoes rapid thermal expansion to a high temperature at which radiant heat rays are generated, the metal heating member does not undergo thermal deformation and can be maintained in a flat state. Also, in the planar state,
Radiant heat rays can be generated most efficiently. Moreover, since electric power is used as an energy source, temperature control is easy, and the cooking environment can be markedly cleaner than that of charcoal or gas combustion. As a result, it is possible to provide a high-frequency electromagnetic cooker excellent in soaking property and suitable for grilled food cooking.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a high frequency electromagnetic cooker according to the present invention.

FIG. 2 is an electric circuit diagram for operating the cooling fan of the same.

FIG. 3 is a schematic view showing another embodiment of the high-frequency electromagnetic cooker according to the present invention.

FIG. 4 is a schematic view showing still another embodiment of the high-frequency electromagnetic cooker according to the present invention.

FIG. 5 shows an example of a heating plate used in an example of the present invention.

FIG. 6 shows a shape of a heat insulating material plate used in an embodiment of the present invention.

FIG. 7 shows an experimental example of the heating device of FIG.

FIG. 8 shows another embodiment of the present invention, which is an example in which a heating unit is installed above.

FIG. 9 shows another embodiment of the present invention, which is an example in which a pair of heating units are installed laterally.

[Explanation of symbols]

 1 Main Body 2 Top Plate 3 Work Coil 4 Spacer 5 Insulation Material 6 Heating Plate 7,17 Cooling Fan 8 Antenna Coil 9 Silicon Rectifier 10 Smoothing Capacitor 11 DC Motor 12 Circuit Protection Resistor 13 Fan 14 Cooling Hole 15 Hood 16 Insulation Material plate 18 Center spacer 18 'Hole for passing through the center spacer 19 Metal heating part 20 Slit hole 21 Central hollow part 22 Suction duct 23 Wire mesh 24 Fish 25 Liquid dropping from fish 26,29 Heating box 27,30 Dish 28,31 Food ingredients

Claims (9)

[Claims] 1. A high-frequency electromagnetic cooker comprising at least a work coil for generating a high frequency, a metal heating member heated by an alternating magnetic field generated by the high frequency, and a means for insulating the work coil and the metal heating member from each other. And the metal heating member is planar and has at least one
A high-frequency electromagnetic cooker characterized by having at least one slit hole extending substantially in the circumferential direction. 2. The high frequency electromagnetic cooker according to claim 1, wherein the metal heating member has a plurality of slit holes, and the slit holes have a discontinuous portion at a part thereof. 3. The high frequency electromagnetic cooker according to claim 2, wherein the discontinuous portions of the slit holes are located symmetrically with the discontinuous portions of the adjacent slit holes. 4. The high frequency electromagnetic cooker according to claim 1, wherein a central portion of the metal heating member is hollowed out. 5. The high frequency electromagnetic cooker according to claim 1, wherein the metal heating member is a non-magnetic or magnetic stainless steel having a thickness of 0.1 to 1 mm. 6. The heating temperature of the metal heating member is 700 to 1
The high frequency electromagnetic cooker according to claim 1, which has a temperature range of 000 ° C. 7. The high frequency electromagnetic cooker according to claim 1, wherein the heat generated by the metal heating member includes visible light or infrared light. 8. The frequency of generation of the work coil is 20 to 3
The high frequency electromagnetic cooker according to claim 1, which has a frequency range of 0 kHz. 9. A means for insulating the work coil and the metal heating member from each other is a top plate on the work coil, a heat insulating material plate installed on the top plate via a spacer, the top plate and the heat insulating material plate. The high-frequency electromagnetic cooker according to claim 1, wherein the high-frequency electromagnetic cooker includes a unit that blows air into a gap between