JP2848280B2 - Electromagnetic cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic cooker, and more particularly, to an electromagnetic cooker in which a heating table and a cooking pot are formed separately.

[0002]

2. Description of the Related Art An electromagnetic heater having a built-in work coil has been widely used for home use. This type of electromagnetic heater does not generate heat by itself, and the cooking pot placed on the heater generates heat due to electromagnetic induction by the work coil. There is no advantage.

[0003]

However, in the case of the above-described electromagnetic heater, although the heating efficiency is good because the cooking pot serves as a heating element, the heating from the cooking pot placed on the heater is high. The amount of heat increases, and cooking that requires long-time heating, such as boiled cooking, has to increase power consumption. In addition, the cooking pot itself becomes a heating element, and thus becomes hot during cooking.

The present invention has been made in view of the above points, and has a simple structure that suppresses heat radiation from a cooking pot as much as possible, thereby saving energy in cooking cooking and the like.
An object of the present invention is to improve the finished state of cooking, improve the heat retention performance, and improve safety.

[0005]

According to a first basic configuration of the present invention, as a means for solving the above-mentioned problems, a heating table having a built-in work coil and a mounting portion on the upper surface of the heating table are detachably mounted. An electromagnetic cooker comprising: a cooking pot having a lid to be placed; and an insulating frame that covers the outer peripheral surface of the cooking pot on the upper surface of the heating table. In addition, a heat insulating lid for covering the lid of the cooking pot along the lid is detachably mounted, and heat radiation from the cooking pot (that is, heat radiation from the peripheral surface side and the lid side) is possible. In addition to the above, it is possible to use the apparatus with the heat insulating frame and the heat insulating lid removed (in other words, various use forms are possible).

According to a second basic configuration of the present invention, as a means for solving the above-mentioned problems, a heating base having a built-in work coil and a lid detachably mounted on a mounting portion on the upper surface of the heating base are provided. An electromagnetic cooker provided with a cooking pot having at least a side peripheral portion of the cooking pot having a vacuum double structure, and an insulating cover for covering the cooking pot along the cover. It is placed so that it can be detached, heat radiation from the cooking pot (that is, heat radiation from the peripheral surface and the lid side) is suppressed as much as possible, and it is possible to use it with the heat-insulating lid removed. Then, various forms of use are possible).

In the first or second basic configuration of the present invention, positioning means for positioning the cooking pan with respect to the placement section is provided on the upper surface of the heating table and the bottom of the cooking pan, respectively. This is preferable in that the positioning when the cooking pot is exclusively used can be easily performed.

[0008] Further, a stew mode switch operated when selecting the stew mode on the heating table, and control means for maintaining the heating state of the work coil at a predetermined temperature by operating the stew mode switch. It is preferable to provide the temperature control in that the temperature control during the stew cooking can be favorably maintained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 7 show an electromagnetic cooker according to a first embodiment of the present invention.

The electromagnetic cooker includes a heating table 1 having a built-in work coil 3 and a cooking pot 2 removably mounted on a mounting section 1a on the upper surface of the heating table 1.

The heating table 1 has a substantially rectangular parallelepiped outer case 4.
The outer case 4 includes a synthetic resin top member 5 forming an upper surface, a synthetic resin bottom member 6 forming a bottom surface, and a sheet metal connecting the top member 5 and the bottom member 6. The body member 7 and the top member 5 and the bottom member 6 are forcibly fitted to each other. The front side of the top member 5 is formed as an inclined portion 5a inclined downward. The inclined portion 5a includes a normal cooking mode switch 39, a warming mode switch 40, a stew mode switch 41, and a timer. An operation panel 8 including a setting switch (hour) 42, a timer setting switch (minute) 43, a temperature control switch 44, a liquid crystal display 45, and the like (see FIG. 4) is provided. On the back side of the operation panel 8, a liquid crystal display device 46, and a microcomputer control board 47 provided with control circuit means such as a control unit described later, mainly a microcomputer, are provided.

The placing portion 1a is formed by protruding a part of the top member 5 in a circular shape. An annular concave portion acting as a positioning means for the cooking pot 2 is formed on the outer peripheral side of the placing portion 1a. A groove 9 is formed.

A center sensor 10 acting as a temperature detecting means is disposed inside the top member 5 at a position corresponding to the center of the mounting portion 1a. Is provided with a work coil 3 acting as a heating means. The work coil 3
A coil base 13, a heat shield 14, a ferrite core 15, and a work coil support member 16 are supported on an upper portion of a support box 12 supporting a control board 11 on a lower side. Sign 1
7 is a cooling fan.

The control board 11 includes a rectifier circuit (diode bridge circuit) 48 and a choke coil 4 described later.
9. Drive circuit (output control circuit) for driving the work coil 5
0 and various control circuits (see FIG. 5) such as a relay 51 are provided.

On the other hand, the cooking pot 2 is made of a material (for example, cast iron, stainless steel, etc.) that can be electromagnetically induced by the work coil 3, and has a handle 1 for carrying on both sides at the upper end.
8 and 18 and a transparent heat-resistant glass lid 19.

On the bottom of the cooking pot 2, an annular convex portion 20 which engages with an annular groove 9 formed on the outer periphery of the mounting portion 1 a of the heating table 1 and acts as a positioning means for the cooking pot 2. Are protruded integrally. That is, in the case of this electromagnetic cooker, the cooking pot 2 is provided with an annular groove 9 serving as a positioning means.
It is a dedicated pot positioned by the phase engagement between the ring and the annular projection 20.

Further, a cylindrical heat insulating frame 21 surrounding the outer periphery of the cooking pot 1 is removably mounted on the upper surface of the heating table 1. The upper part of the pot 2 (in other words, the lid 19) is
A heat insulating lid 22 for covering along 9 is detachably mounted. In the upper part of the heat insulating frame 21, cutout recesses 23, 23 for allowing the handles 18, 18 of the cooking pot 2 to face are formed. The knob 24 and the lid 1 of the cooking pot 2 are provided on the upper and lower surfaces of the heat insulating lid 22.
Recesses 26 for accommodating the nine knobs 25 are respectively formed. With such a configuration, the heat insulating frame 21
In addition, the cooking pot 2 can be covered without increasing the diameter of the heat insulating lid 22, and the heat insulating frame 22 and the heat insulating lid 22 can be reduced in size. In addition, as shown in FIG. 2, during cooking without using the heat insulating lid 22, the cooking pot 2 can be put in and out without removing the heat insulating frame 21.

Further, an annular ridge 27 is integrally formed at the upper end of the heat insulating frame 21, and an annular recess 28 is integrally formed at a lower end of the heat insulating lid 22. The heat insulating lid 22 is positioned and mounted on the heat insulating frame 21 by engaging the concave portion 28 with the concave portion 28 (see FIG. 3).

The heat insulating frame 21 and the heat insulating lid 22 have the same heat insulating structure, and are formed by filling a foam heat insulating material 30 in an outer shell 29 made of a synthetic resin (for example, polypropylene or the like).

Thus, in this electromagnetic cooker, only the heat insulating frame 21 is placed on the heating table 1 during cooking (FIG. 2).
In addition, when cooking the food or keeping the temperature after the cooking, the heat insulating lid 22 is placed on the upper opening of the heat insulating frame 21. By doing so, the heat radiation from the cooking pot 2 during cooking is suppressed as much as possible, and energy saving in cooking of stewed foods and the like can be achieved. In addition, the heat insulation performance at the time of heat insulation can be greatly improved, and the heat insulating frame 21 and the heat insulating lid 22 also function as protective frames, so that the safety is greatly improved. Moreover, in the case of the heating table 1, the cooking pot 2 is heated by electromagnetic induction by the work coil 3 (that is, the cooking pot 2 is heated).
(Heated by the resistance heat of the eddy current generated in the cooking pan 2), so that the heating table 1 itself does not generate heat.
It is not necessary to consider the thermal effect of the heat insulating frame 21.

The electric elements of the electromagnetic cooker are connected as shown in FIG.

In FIG. 5, reference numeral 52 denotes an AC power supply,
Is a thermal fuse, 54 is an IGBT switching transistor, 55 is a smoothing capacitor, 56 is a resonance capacitor, 57 is a damper diode, and 58 is a buzzer.

Reference numeral 59 denotes a control unit provided on the control board 11, which performs various arithmetic processing based on input signals from the center sensor 10 and various switches 39 to 44, and performs a cooling fan 17, a driving circuit 50 , Relay 5
1. A control signal is output to the liquid crystal display 45 and the buzzer 58. That is, the control unit 59 functions as control means in the claims.

Next, with reference to the flow charts shown in FIGS. 6 and 7, the control during the stew cooking and the temperature keeping in the electromagnetic cooker will be described in detail.

(I) Braised Cooking Control (Refer to the flowchart in FIG. 6) Braised cooking is executed by turning on the braised mode switch 41 after the food in the cooking pan 2 is brought into a boiling state. At this time, cooking is performed in a state where the cooking pot 2 is covered with the heat insulating frame 21 and the heat insulating lid 22.

That is, when it is confirmed in step S ₁ that the stew mode switch 41 has been turned ON, the necessary stew time is set by the timer setting switches 42 and 43 in step S ₂ , and at the same time, the process proceeds to step S 1. _{At 3} , temperature information (that is, detected temperature T) from the center sensor 10 is input.

[0028] Next, at step S ₄ and step S ₅ the detected temperature T and the first and second set temperature Ts ₁ (e.g., 85 ℃), Ts ₂ (e.g., 100 ° C.) is compared with the done, T ≧ Ts ₁ work coil 3 is turned OFF, when it is determined that T ≦ Ts ₂ a work coil 3 is oN at step S ₇ in step S ₆ in the case where it is determined that. Then, the stew cooking is continued until the time set by the timer setting switch 42, 43 in step S ₈ is determined to have elapsed. That is, in the stew cooking, the heating state by the work coil 3 is maintained at a predetermined temperature (for example, 85 ° C. to 100 ° C.) (that is, the temperature drop to the first set temperature Ts ₁ and the second set temperature). The temperature rise up to Ts ₂ is repeated), and a delicious simmered dish with a good taste can be obtained without causing boiling or burning.

[0029] When the set time in step S ₈ is determined to have elapsed, the buzzer 58 to notify the user cooking ends in step S ₉ is sounded.

(II) Insulation Control (Refer to the flowchart in FIG. 7) This insulation control is executed when it is desired to keep the temperature after cooking is completed. At this time, cooking is performed in a state where the cooking pot 2 is covered with the heat insulating frame 21 and the heat insulating lid 22.

[0031] That is, the heat insulating mode switch 40 at step S ₁ is that it has been turned ON is checked, step S ₂ and the holding time timer setting switch 4 in
2, 43 and at the same time is set by the temperature information from the center sensor 10 in step S ₃ (i.e., the detected temperature T) is inputted.

[0032] Next, at step S ₄ and step S ₅ the detected temperature T and the third and fourth set temperature Ts ₃ (e.g., 65 ℃), Ts ₄ (e.g., 70 ° C.) made a comparison between, T ≧ Ts ₃ and a work coil 3 is OFF in step S ₆ in the case where it is determined, T ≦ Ts ₄ and when it is determined work coil 3 in step S ₇ has O
N. Then, the temperature retaining control is continued until the time set by the timer setting switch 42, 43 in step S ₈ is determined to have elapsed. That is,
In the heat retention control, the state of heating by the work coil 3 is maintained at a predetermined temperature (for example, 65 ° C. to 70 ° C.), and heat retention without fear of decay or the like is obtained.

[0033] When the set time in step S ₈ is determined to have elapsed, the buzzer 58 to notify the user warmth ends in step S ₉ is sounded.

In this heat keeping control, the heat keeping set temperatures Ts ₃ and Ts ₄ can be changed by the user's request.

Second Embodiment FIG. 8 shows an electromagnetic cooker according to a second embodiment of the present invention.

In this case, the point of difference from the first embodiment is that the structure of the cooking pot 2 and that the heat insulating frame is not used.

The outer periphery of the cooking pot 2 has a vacuum double structure. That is, the cooking pot 2 is configured by joining a stainless steel tubular body 32 to an outer peripheral portion of a stainless steel pot main body 31 and forming a vacuum layer 33 therebetween. The lid 34 of the cooking pot 2 includes a transparent heat-resistant glass lid 34a and a heat insulating lid 34b for detachably covering the lid 34a along the lid 34a. During cooking, the heat-insulating lid 34b is removed, and the heating state of the food in the cooking pot 2 can be observed. At the time of stew cooking and at the time of heat retention, the heat insulating cover 34b
By using, the heat insulation performance can be greatly improved.

In this case, since the outer peripheral side of the cooking pot 2 has a vacuum double structure, heat radiation from the cooking pot 2 during cooking can be suppressed as much as possible, and energy saving in cooking of stew can be achieved. . In addition, the heat insulation performance during the heat insulation can be greatly improved, and the vacuum double structure portion also functions as a protective frame, so that the safety is greatly improved. In addition, since a heat insulating cover is not required as in the first embodiment, the number of parts is reduced.

The other configuration, operation, and effect are the same as those in the first embodiment, and thus the description is omitted to avoid duplication.

[0040]

According to the present invention, with a simple configuration,
The heat radiation from the cooking pot during cooking is suppressed as much as possible, and the exposure of high temperature parts is prevented while improving the heat insulation performance at the time of heat insulation, so that energy saving in cooking cooking etc. can be achieved, There is an excellent effect that safety is greatly improved.

Further, an insulating frame for covering the outside of the side peripheral surface of the cooking pot is detachably mounted on the upper surface of the heating table, and a lid of the cooking pot is covered on the insulating frame along the lid. Since the heat-insulating frame is detachably mounted, heat radiation from the cooking pot can be suppressed as much as possible, and the heat-insulating frame and the heat-insulating lid can be used in a detached state (in other words, Various usage forms are possible).

Furthermore, when at least the side periphery of the cooking pot has a vacuum double structure, and a heat insulating lid for covering the lid of the cooking pot along the lid is detachably mounted on the cooking pot, It is possible to suppress the heat radiation from the pot as much as possible, and it is also possible to use it with the heat insulating frame and the heat insulating lid removed (in other words, it is possible to use in various forms).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic cooker according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state during cooking of the electromagnetic cooker according to the first embodiment of the present invention.

FIG. 3 is a half sectional view of a heat insulating frame and a heat insulating lid in the electromagnetic cooker according to the first embodiment of the present invention.

FIG. 4 is a plan view of an operation panel in the electromagnetic cooker according to the first embodiment of the present invention.

FIG. 5 is a connection diagram of electric elements in the electromagnetic cooker according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of cooking control for cooking in the electromagnetic cooker according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of heat retention control in the electromagnetic cooker according to the first embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of an electromagnetic cooker according to a second embodiment of the present invention.

[Explanation of symbols]

1 is a heating table, 1a is a mounting portion, 2 is a cooking pot, 3 is a work coil, 9 is a positioning means (annular groove), 19 is a lid, 2
0 is a positioning means (annular convex portion), 21 is an insulating frame, 22 is an insulating cover, 31 is a pot body, 32 is a cylindrical body, 33 is a vacuum layer,
34 is a lid, 34a is a lid, 34b is a heat insulating lid, 41 is a stew mode switch, and 59 is a control means (control unit).

Claims (4)

(57) [Claims] 1. A heating table having a built-in work coil, and a lid detachably mounted on a mounting portion on the upper surface of the heating table.
An electromagnetic cooker provided with a cooking pot that performs heating, on the upper surface of the heating table, a heat insulating frame that covers an outer peripheral surface of the cooking pot , which is detachably mounted , Cooking in the frame
Remove the heat-insulating lid that covers the pot lid along the lid
An electromagnetic cooker characterized by being placed on the ground . A heating table having a built-in work coil;
Has a lid that can be detachably mounted on the mounting part on the top of the heating platform
An electromagnetic cooker provided with a cooking pot, wherein
At least the side periphery in the vacuum double structure
In the cooking pot, characterized in that it is mounted removably a heat insulating cover for covering along the lid of the cooking pot lid
Electric magnetic cooker. The method according to claim 3, wherein the heating stand top and the cooking pan bottom portion, claim 1, characterized in that provided Re Zorezo positioning means for positioning the cooking pot against the mounting section
An electromagnetic cooker according to any one of claims 3 and 4 . 4. A heating mode switch which is operated when selecting a heating mode, and a control means for maintaining a heating state of the work coil at a predetermined temperature by operating the heating mode switch. electromagnetic cooker according to any one claim of claim 1 through claim 3, characterized in that annexed and.