JP3440464B2 - Insulated pot - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warming pot that heats a pot by electromagnetic induction heating with heating means such as a heating coil.

[0002]

Conventionally, in this type of heat-retaining pot, a heating coil as a heating means for electromagnetically heating a pot is provided with a bottom outer surface of the pot housing portion, or a bottom outer surface and a lower side outer surface, or a bottom outer surface. And the side outer surface is provided on either the upper part or the lower part. Then, when a predetermined high frequency current is supplied to the heating coil, the magnetic metal material of the pan provided in the magnetic field near the heating coil generates heat to electromagnetically heat the pan and heat the pan when cooking rice or keeping it warm. ing.

By the way, a temperature sensor for detecting the temperature of the pan is pressed against the pan bottom by the elastic force of a coil spring or the like on the outer bottom surface or the outer surface of the pan.
Aluminum having good thermal conductivity is often used for the contact portion of the pan temperature sensor, which is the pan temperature detecting means, with the pan. When the pan is heated by electromagnetic induction while cooking rice or keeping warm, sound is generated due to slight vibration of the pan or heating coil.If the pan temperature sensor is not in good contact with the pan, it will resonate and generate an abnormal sound. It may occur. In particular, since the amount of heat that heats the pan during heating is smaller than when cooking rice, the fan motor that cools the circuit board provided in the main body of the container is stopped. Therefore, there is a problem that the vibration sound is easily heard directly, and even if it is not the abnormal sound at the time of resonance as described above, it becomes very annoying as noise in a quiet environment such as at night. In addition, reduction of power consumption during heat retention is an important technical issue in this type of heat retention pot.

In view of the above problems, the present invention aims to reduce the noise associated with heating the pot during heat retention, reduce the amount of power consumption , and compensate for the insufficient amount of heat to maintain heat.
It is an object of the present invention to provide a heat-retaining kettle capable of preventing the problem that the temperature cannot be maintained .

[0005]

In order to achieve the above-mentioned object, a warming pot according to claim 1 of the present invention comprises a pot, heating means for electromagnetically heating the pot, and intermittent heating of the heating means. First heating with different average heating amount to the pan
A pattern storing a pattern and a second heating pattern, respectively.
1st heating pattern memory means and 2nd heating pattern memory hand
Has a step, when the temperature of該鍋is lower than the predetermined temperature, the
A second heating pattern is selected to select the first heating pattern.
The average heat quantity than emissions is to become a large configuration, when the temperature of該鍋is equal to or higher than the predetermined temperature, selecting the first heating pattern
In addition , the heat retention control means is provided so that the average heating amount for heating the pot to be less than 1 second is small.

According to the structure of claim 1, if the pot is at a predetermined temperature or higher, the first heating pattern is selected, and the heating time for the pot becomes less than 1 second, which is related to heating the pot during heat retention. It is possible to reduce noise. Also, while shortening the pot heating time, the pot is heated intermittently to perform fine heat retention control, so the temperature fluctuation of the pot becomes small and unnecessary heating of the pot is prevented, Power consumption can be reduced.
Further, the first to the heating time to these pots and less than 1 second
In the above heating pattern, when the pot does not reach the predetermined temperature or higher, the pot is heated with a larger average heating amount by another second heating pattern. Therefore, even when the temperature is low, the power supply voltage is low, or when cold food is heated, it is possible to maintain the desired temperature of the object to be kept in the pan and compensate for the insufficient amount of heating, so that the temperature cannot be maintained.
It becomes possible to prevent such troubles.

[0007] The heat insulation pot according to claim 2 of the present invention,
In order to achieve the above object, a pot, heating means for electromagnetically heating the pot, a first heating pattern and a second heating pattern.
First heating pattern memory hand that remembers each turn and
A pan and a second heating pattern storage means, wherein the pan is the first
If the temperature is less than, select the first heating pattern
Then, intermittent heating is performed by heating the pot for less than 1 second and stopping heating to the pot for 1 second or longer. When the pot is at a first temperature or higher, the pot heating is omitted. In addition, the pot has a second temperature lower than the first temperature.
If it is less than degrees, select the second heating pattern,
The average heating amount to the pan is higher than that of the first heating pattern.
It is provided with a heat retention control means for increasing the heat retention.

According to the second aspect of the present invention, if the pot is below the first predetermined temperature, the heating time for the pot is less than 1 second, and the noise associated with heating the pot during heat retention is reduced. Can be achieved. Also, while shortening the pot heating time, the pot is heated intermittently to perform fine heat retention control, so the temperature fluctuation of the pot becomes small and unnecessary heating of the pot is prevented,
Power consumption can be reduced. Further, when the pot reaches a predetermined temperature or higher, heating of the pot is omitted, so that it is possible to prevent the heat-retained object in the pot from being heated more than necessary and further reduce the power consumption. Also, when the pot reaches or exceeds the second predetermined temperature
If not, the average heating amount by another second heating pattern
Is heated to the pan. Because of this, low
When the temperature is high, the power supply voltage is low, or the rice is cold
Even in cases such as when you want to keep the object to be kept in the pan at the desired temperature.
It can be maintained and compensates for the insufficient heating amount to maintain the heat retention temperature.
It becomes possible to prevent the problem of being lost.

Further, the heat insulation pot according to claim 3 of the present invention is
In order to achieve the above-mentioned object, a pan, a heating means for electromagnetically heating the pan for both rice cooking and heat retention, and a first heating pad.
A first memory for storing a turn and a second heating pattern, respectively
Heating pattern storage means and second heating pattern storage means
And said pot is below a first temperature, said first
The heating pattern is selected to perform intermittent heating by heating the pan for less than 1 second and stopping heating the pan for 1 second or longer, and when the pan is at a first temperature or higher. The heating of the pot is omitted , and the pot is heated to the first temperature.
A second heating below the second temperature, which is lower than
Select a pattern that is more than the first heating pattern
It is provided with a heat retention control means for maintaining the heat by increasing the average heating amount to the pan .

According to the third aspect of the present invention, if the pot is below the first predetermined temperature, the first heating pattern is selected.
As a result, the heating time for the pan is less than 1 second, and the noise associated with heating the pan during heat retention can be reduced. Also, while shortening the pot heating time, the pot is heated intermittently to perform fine heat retention control, so the temperature fluctuation of the pot becomes small and unnecessary heating of the pot is prevented, Power consumption can be reduced. Further, when the pot reaches the first predetermined temperature or higher, the pot heating is omitted, so that it is possible to prevent the heated object in the pot from being heated more than necessary and further reduce the power consumption. In addition, it is not necessary to provide a dedicated heating means for heating during heat retention, and the configuration can be simplified. Also, the pot
If the second predetermined temperature or higher is not reached, another second heating is performed.
Depending on the pattern, the average heating amount is increased for the pan
Done. Therefore, at low temperature or when the power supply voltage is low,
Alternatively, when heating cold or rice, etc.
You can maintain the desired temperature of the object to be heated
In addition , prevent the trouble that the heat retention temperature can not be maintained.
It will be possible.

Further, the heat insulation pot according to claim 4 of the present invention is
In order to achieve the above object, a pot, heating means for electromagnetically heating the pot, a first heating pattern and a second heating pattern.
First heating pattern memory hand that remembers each turn and
A pan and a second heating pattern storage means, wherein the pan is the first
If the temperature is less than, select the first heating pattern
Then, in a heating period set for a time of less than 1 second, and in a time shorter than the time until the temperature of the pan drops below a predetermined heat retention temperature after stopping the heating of the pan in this heating period. Performs intermittent heating by the set heating stop period, omits the pan heating when the pan is at a predetermined temperature or higher ,
Furthermore, the pot has a second temperature lower than the first temperature.
If full, select the second heating pattern,
The average heating amount to the pan is larger than the first heating pattern
And a heat retention control means for keeping the heat.

According to the structure of claim 4, when the pot is below the first predetermined temperature, the heating time for the pot is less than 1 second, and the noise related to the pot heating during heat retention is reduced. Can be achieved. Also, while shortening the pot heating time, the pot is heated intermittently to perform fine heat retention control, so the temperature fluctuation of the pot becomes small and unnecessary heating of the pot is prevented,
Power consumption can be reduced. Further, when the pot reaches the first predetermined temperature or higher, the pot heating is omitted, so that it is possible to prevent the heated object in the pot from being heated more than necessary and further reduce the power consumption. Moreover, since the time is set so that the heating stop period ends before the temperature of the pan drops significantly, it is possible to prevent problems that the temperature fluctuations become large, and the structure keeps the pan intermittently heated while keeping it warm. The necessary and sufficient heating amount can be secured. Also, if the pot does not reach the specified temperature or above.
If not, use another second heating pattern to set the average heating amount.
Greater heating is applied to the pan. Because of this, low temperature
Time, when the power supply voltage is low, or when heating cold food.
Even in the event of heat, keep the heat-retained object in the pan at the desired temperature.
It can be held for a long time to compensate for the insufficient heating amount and maintain the heat retention temperature.
It becomes possible to prevent the problem that disappears.

Further, the heat insulation pot according to claim 5 of the present invention is
In order to achieve the above-mentioned object, a pot, a heating means for electromagnetically heating the pot, an intermittent heating of a pot heating for heating the pot for less than 1 second and a heating stop for stopping the heating to the pot for 1 second or more. And a first heating pattern storing means for storing a second heating pattern having a higher heating rate to the pan than the first heating pattern,
2 has a heating pattern storage means, when the temperature of the pan is lower than the first temperature, the first heating pattern is selected,
When the temperature of the pot is lower than the second temperature which is lower than the first temperature, there is provided heat retention control means for selecting the second heating pattern to perform heat retention.

According to the fifth aspect of the present invention, if the temperature of the pan is equal to or higher than the second temperature and lower than the first temperature, the first heating pattern is selected and the heating time for the pan is 1 second. It is less than less, and it is possible to reduce the noise associated with heating the pot during heat retention. Further, when the first heating pattern is selected, the pot heating is intermittently performed while the pot heating time is shortened, and fine heat retention control is performed. It is possible to reduce the power consumption by preventing heating of the pan. Furthermore, in the first heating pattern where the heating time for such a pan is less than 1 second,
When the temperature does not reach the temperature of 1 or more, the pan is heated by the second heating pattern with a higher heating rate. Therefore, even when the temperature is low, the power supply voltage is low, or when cold food is heated, the heat- retained object in the pan can be maintained at a desired temperature, and the insufficient heating amount can be compensated.
Therefore, it is possible to prevent the problem that the heat retention temperature cannot be maintained .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a heat retaining pot according to the present invention will be described below with reference to FIGS. In FIG. 2 showing an overall sectional view of the warming pot, 1 is a main body of the vessel, 2 is an outer frame that forms an outer shell of the main body 1, and a bottom plate 3 is fitted and fixed to the lower end of the bottom of the outer frame 2 which is opened. Has been done. Also, the outer frame 2
Inside, there is provided a bottomed cylindrical pan containing portion 5 for detachably containing the pan 4. The pot housing wall 6 that constitutes the side surface of the pot housing portion 5 is formed integrally with the outer frame 2 that forms the upper portion of the pot housing portion 5. The material of the outer frame 2 is an electrical insulator such as polypropylene, which has a glossy appearance and is selected from materials having a ball pressure temperature of 140 ° C. or higher as defined by the Electrical Appliance and Material Control Law. On the other hand, the coil base 7 that is a separate component from the outer frame 2 and forms the bottom of the pan housing portion 5 is made of an electrical insulator such as a material containing glass fiber in polyethylene terephthalate,
It is selected from materials that are flame-retardant and that have an operating temperature limit of 120 ° C or higher specified by the Electrical Appliance and Material Control Law. Then, the bottomed cylindrical pan 4 for accommodating cooked foods such as rice and water during rice cooking and for accommodating foods such as rice during warming can be freely inserted into and removed from the pan accommodating portion 5. Be accommodated.

The pan 4 is mainly composed of a material selected from materials having good thermal conductivity such as aluminum, and the main body of the pan is
Forming 11 The pot body 11 is formed by die casting or molten metal forging, and at the time of forming, the bottom body and the lower part of the side face of the pot body 11 are made of a magnetic metal material such as ferritic stainless steel and formed into a predetermined dish shape to generate heat. The body 12 is joined. On the upper part of the pan 4, a flange portion 13 extending outward in the horizontal direction is formed.
By placing the lower surface of the pot on the upper end portion of the pot housing portion 5, the pot 4 is accommodated in a suspended state inside the pot housing portion 5. At this time, a gap 14 having a size of 1 mm or more and 6 mm or less (hereinafter, the above and the following are simply referred to as ~) is formed between the outer surface of the pan 4 and the inner surface of the pan accommodating portion 5 and serves as a heat insulating space. It is configured to enhance the heat retention of the pan 4.

Reference numeral 15 denotes a pan temperature sensor which is a pan temperature detecting means provided at the center of the bottom of the coil base 7. This pan temperature sensor 15 is elastically pressed against the bottom of the outer surface of the pan 4 by a coil spring (not shown), and constantly detects the temperature of the cooked food or the heat-reserved food in the pan 4 and thus in the pan 4. , It controls heating when cooking rice or keeping warm. The outer surface of the pot temperature sensor 15 in contact with the pot 4 is made of aluminum having good thermal conductivity.

Reference numeral 21 is a heating coil which is a heating means provided on the outer surface of the coil base 7. This heating coil 21
The pan 4 is used for electromagnetic induction heating by also serving as a rice cooker and a heat insulator. The pan 4 is provided at a position facing the bottom surface and lower side surface of the pan 4 while facing the heating element 12. The heating coil 21 may be provided only in the bottom surface of the pot 4 or in a state of facing a plurality of positions on the side surface of the pot 4. A body heat insulating wall 23 is provided outside the pot housing wall 6 with a side surface space 22 having a gap of 1 to 9 mm, preferably a gap of 1 to 5 mm. The body heat insulating wall 23 is the same as the pan housing wall 6 in the outer frame 2
And the material thickness is 0.8-3.0 mm. Therefore, the pot accommodating wall 6 and the body heat insulating wall 23 are made of the same material as the outer frame 2 and have a reasonable manufacturability that is simultaneously formed at the time of plastic injection molding.

A coil cover 25 is provided outside the coil base 7 with a bottom space 24 having a gap of 1 to 9 mm, preferably a gap of 1 to 5 mm. However, a bottom space 24 having a gap equal to or larger than the thickness of the heating coil 21 is formed at the location where the heating coil 21 is arranged. Like the coil base 7, the material of the coil cover 25 is an electrical insulator such as a material containing glass fiber in polyethylene terephthalate, which has flame retardancy and uses an electrical insulator defined by the Electrical Appliance and Material Control Law. The material selected has a maximum temperature of 120 ° C or higher. The material thickness of the coil cover 25 is 1.2 to 3.5 mm. When the bottom of the coil base 7 is covered with the coil cover 25, the pan housing wall 6
The space at the lower end of the pan is substantially shielded, and the side surface space 22 and the bottom surface space 24 are formed in communication with the outer bottom surface and the outer surface of the pan housing portion 5, respectively. It is desirable that the side surface space 22 and the bottom surface space 24 are completely hermetically sealed spaces, but the fitting parts of each member, the lead wire outlet (not shown) of the heating coil 21, and the pan. There may be some gap such as a portion where the temperature sensor 15 is mounted. Also heating coil
The coil cover 21 has a spiral shape and is partially adhered and fixed to the outer surface of the coil base 7 with a silicone adhesive or the like.
In the structure, it is covered from below and does not fall. Therefore, the heating coil 21 is arranged in the gap between the coil base 7 and the coil cover 25, that is, in the bottom space 24. Further, in order to prevent falling and vibration, it is preferable not to form a gap between the coil base 7 and the coil cover 25 where the heating coil 21 is provided. A ferrite member 26 that prevents leakage of magnetic flux from the heating coil 21 is attached to the outside of the coil cover 25.

In the outer frame 2, a heating substrate 31 is provided below the ferrite member 26. This heating substrate 31
In each case, a heating board unit 32 that constitutes a control circuit of the heating coil 21 and a switching element 33 that is a heat generating component are mounted. The heating substrate unit 32 includes an inverter circuit and the like, and supplies a predetermined high frequency current to the heating coil 21. A magnetic field is generated in the heating coil 21 by the supply of this high-frequency current, and the heating element 12 of the pot 4 is heated by electromagnetic induction heating to heat the pot 4. It is the same as the standard jar warmer.
Further, between the switching element 33 for generating a high frequency current and the heating substrate 31, a heat radiating plate 35 having a large number of fins 34 formed downward is attached in a thermally adhered state. The lower ends of the fins 34 face the ventilation holes 36 formed in the bottom plate 3, and are configured to circulate heat with the outside air here.

Reference numeral 37 is a substrate provided inside the front portion of the outer frame 2. A power supply unit 38 forming a power supply circuit is provided downward on the board 37, and an L unit to be described later is provided.
The display operation unit 39 including a display unit 88 such as a CD or an LED and an operation unit 82 including various switches is provided in the outer frame 2.
Is provided so as to face the operation panel 40 mounted on the front surface of the. Reference numeral 41 denotes a cord reel provided inside the rear portion of the outer frame 2 for winding a power cord (not shown).

Reference numeral 51 is a lid that directly covers the upper opening of the pot 4. The lid 51 is made of a plastic resin material such as polypropylene, and an outer lid 52 that forms an outer surface of the lid 51,
An outer lid cover 53 made of a plastic resin material such as polypropylene and fitted to the lower outer circumference of the outer lid 52, which is formed on the outer circumference of the lower portion of the lid 51 and does not face the upper opening of the pot 4, and an aluminum And a lower surface member 54 that forms a portion of the lower surface of the lid 51 facing the upper opening of the pot 4 and is substantially configured. On the outer peripheral portion of the lower surface member 54, a flange-shaped fixing portion 55 that is attached and fixed to the outer lid cover 53 via a screw (not shown) is formed, and in the other portion, a hole 56 is provided in the center. A base 57 is formed. The lower surface of the base 57 has a good appearance and cleanliness when the lid 51 is opened.
Except for the recessed portion 58, it is formed in a flat shape in which screws and the like are not exposed. An annular groove 59 is formed on the upper surface of the base 57. These recesses 58 and grooves 59 are provided to suppress the temperature rise of the fixed portion 55 on the outer peripheral portion of the lower surface member 54.

On the upper surface, that is, the back surface of the lower surface member 54, a lid temperature sensor 61 as a lid temperature detecting means for detecting the temperature of the lower surface member 54, and the lower surface member 54 is heated at the time of cooking rice and keeping heat to prevent dew condensation. Each of the lid heaters 62 is provided as a lid heating means. Then, the temperature information from the lid temperature sensor 61 is received, and the temperature of the lid heater 62, particularly the lower surface member 54, is controlled while the lid heater 62 is turned on and off.

Inside the lid 51, a lid lower surface heat shield plate 63 for shielding heat from the lower surface member 54 is provided so as to cover the back surface of the lower surface member 54. Further, another outer lid heat shield plate 64 is provided inside the outer lid 52. Between the outer lid cover 53 and the lower surface member 54, an annular elastic body is formed, and when the lid body 51 is closed,
A lid packing 65, the lower part of which is in close contact with the upper surface of the pan 4, is provided. The lid 51 is pivotally supported on one side of the container body 1, and a hinge 66, which is a pivotal support portion, is provided with a spring (not shown) for urging the lid 51 in the opening direction at all times. Then, when the clamp button 67 for locking the lid 51 on the opposite side of the hinge 66 is released, the lid 51 is automatically opened.

On the upper surface of the outer lid 52, there is provided a recess 71 depressed toward the pot 4. The hole 56 of the lower surface member 54 corresponding to the center of the recess 71 is for mounting the steam cylinder 73 forming the lower part of the steam port 72, and the bottom rear side of the recess 71 located around the hole 56 and the lower surface. The back surface of the member 54 is sealed with a steam port packing 74 made of silicone rubber. The steam port 72 is
Both are composed of a steam port cap 75 and a steam port case 76 made of, for example, polypropylene resin having excellent steam resistance, and are engaged with and disengaged from the steam port packing 74 to form a recess 71.
It is removably attached from the open outside. A shielding plate 77 for opening and closing the upper opening of the steam cylinder 73 is attached to the upper opening of the steam cylinder 73 so as to be vertically movable. And
When the steam generated in the pan 4 during rice cooking flows into the steam cylinder 73 together with the moisture (oneba) in which the starch is dissolved, the steam pushes up the shielding plate 77 by the pressure and the steam of the steam cylinder 73 opened. It penetrates into the steam port 72 through the upper opening. Here, the steam and the oneba are separated, and the one with a large specific gravity is the steam port 72.
While being stored in the lower part of the steam generator, steam is discharged to the outside from a steam outlet 78 formed in the steam mouth cap 75. Then, when the rice cooks and becomes uneven, the inner pressure of the pan 4 is lowered, so that the bean that has accumulated at the lower part of the steam port 72 is returned from the return hole 79 to the pan 4.
Returned inside. Along with this, the shielding plate 77 also goes down,
The upper opening of the steam cylinder 73 is closed to prevent heat from being released.

Next, the electrical configuration will be described with reference to FIG. 3. Reference numeral 81 is a microcomputer (hereinafter referred to as a microcomputer), which is not shown in the figure, but which is not shown in the figure, and which is a control part of a known microprocessor. In addition to the device and the arithmetic unit, a timer, a storage device such as a ROM or a RAM,
And an input / output device. Then, the microcomputer 81 inputs each operation signal from the operation means 82 of the display operation unit 39 and each temperature detection signal from the pan temperature sensor 15 and the lid temperature sensor 56, and the heating substrate unit 32 is configured based on that. Through the IH drive circuit 83 and the high frequency current generating means 84, the heating amount which is the output of the heating coil 21,
While controlling the on / off time of the heating coil 21, the on / off of the lid heater 62 is controlled via the heater drive circuit 85 and the on / off means 86, and further via the display means drive circuit 87.
The display operation unit 39 is configured to control the display operation of the display means 88.

The block diagram of FIG. 1 shows the functional configuration of the microcomputer 81, particularly for heat retention control. In the figure, 91 is based on the temperature information from the pan temperature sensor 15,
It is a heating control means for controlling the output of the heating coil 21 and the interruption of electricity. The heating control means 91 includes a rice cooking control means 92 which is a rice cooking means for performing a normal rice cooking operation of cooking the rice to be cooked in the pan 4, and a heat retention control means 93 which maintains the heat-retained object in the pan 4 at a predetermined temperature. I have it. Further, the heating coil 21 heats the pan 4 at the time of rice cooking by the rice cooking control means 92 and at the time of heat retention by the heat retention control means 93. That is, without providing a body heater or the like for heating the side surface of the pot 4, the single heating coil 21 is configured to heat the pot 4 at the time of cooking rice and keeping it warm.

Each of the heat retention control means 93 has a heating coil 21.
The pot 4 is heated during intermittent heating by heating the pot 4 while disconnecting electricity.
The heating coil 21 has a plurality of heating patterns with different average heating amounts, and one of the heating patterns is selected according to the temperature of the pot 4 detected by the pot temperature sensor 15. To control. Specifically, when the heating coil 21 is energized, that is, the heating time of the pan 4 is less than 1 second,
First heating pattern storing means 94 storing a first heating pattern in which the power interruption time, that is, the heating stop time of the pan 4 is 1 second or more, and the heating coil rather than the first heating pattern.
When the second heating pattern storage means 95 that stores the second heating pattern having a high heating rate for the pan 4 of 21 and the predetermined heating stop period by the first heating pattern or the second heating pattern ends, When the temperature of the pan 4 is lower than the first temperature, the first heating pattern stored in the first heating pattern storage means 94 is selected, and at the same time when the predetermined heating stop period ends, When the temperature is lower than the second temperature which is lower than the first temperature, there is provided heating pattern selection means 96 for selecting the second heating pattern stored in the second heating pattern storage means 95. Insulation control means 93
When the first heating pattern is selected, the pot 4 is intermittently heated by the pot heating that heats the pot 4 for less than 1 second and the heating stop that stops heating to the pot 4 for 1 second or more. If the temperature of the pot 4 is higher than the first temperature at the time when the heating of the pot 4 is started, the heat retention control means 93 omits the next pot heating for less than 1 second and performs heating for 1 second or more. It further comprises a pot heating omitting means 97 for stopping and keeping the object to be kept in the pot 4 at a predetermined temperature, that is, a first temperature.

Next, the operation of the above structure will be described. When cooking rice, the lid body 51 is opened, the pot 4 containing rice and water to be cooked is placed in the pot holding portion 5 of the main body 1, and the lid body 51 is closed. In this state, the surface of the lower surface member 54 of the lid 51 directly covers the upper opening of the pan 4. And
When the operation means 82 in the display operation unit 39 is operated to start the rice cooking by the rice cooking control means 92, the heating element 21 of the pan 4 is heated by the high-frequency energization of the heating coil 21, and the pan 4 is heated. The heating of the pan 4 is controlled according to the temperature of the pan 4 detected by the pan temperature sensor 15. After the rice is cooked, heating the pan 4 by heating the heating coil 21 with high-frequency electricity also
The rice in the pan 4 is kept warm at a predetermined temperature. The lid heater 62
Is heated from the time when rice is cooked to the time when it is kept warm.
Prevents dew condensation on the surface of 54.

In a series of heating operations by the heating control means 91, the amount of heating corresponding to the output of the heating coil 21 is changed by the inverter circuit provided in the heating substrate unit 32 by changing the frequency of the high frequency current supplied to the heating coil 21. By doing so, it is set in the range of 500 to 1300W. In particular, at the time of heat retention performed by the heat retention control means 93, a heating amount of 500 W is used. However, in the case of a heat-retaining pot with a normal capacity of 1.8 liters, the heating amount required to maintain the heat-retaining temperature of the pot 4 at 73 ° C is 50 to 80 W. When the heating amount of the heating coil 21 is set to 500 W and the heat retention heating is performed as it is,
There is a problem that the pot 4 is overheated too much during heating and the temperature fluctuation (ripple) of the pot 4 becomes large. So the heating coil
The average heating amount (average heating amount) to the pan 4 is 50 due to the so-called intermittent heating, in which the pan 21 is intermittently heated by turning on and off electricity.
The heating coil 21 is designed so that the heating coil 21 serving as the same heating means can be used both for cooking rice and for maintaining the temperature by obtaining the heat retention heating amount that is less than 0 W.

In this embodiment, the heat retention is carried out by the procedure of the flowchart shown in FIG. 4 in this embodiment. In the same figure, in step S1, heat retention control means
When heat retention by 93 starts, heating pattern selection means 96
Is the temperature of the pan 4 detected by the pan temperature sensor 15
It is determined whether or not the temperature is less than 70 ° C. (step S2). Then, if the temperature of the pot 4 is less than 70 ° C., the pot 4 is intermittently heated based on the second heating pattern stored in the second heating pattern storage means 95 (step S3), 1
When the cycle ends, the procedure returns to step S2.
On the other hand, if the temperature of the pot 4 is 70 ° C or higher, the next step S
In 4, it is determined whether or not the temperature of the pot 4 is lower than 71 ° C. which is the first temperature. At this time, if the temperature of the pot 4 is less than 71 ° C., the pot 4 is intermittently heated based on the first heating pattern stored in the first heating pattern storage means 94 (step S5), but the temperature of the pot 4 is changed. Is 71 ° C. or higher, the pot heating for heating the pot 4 for less than 1 second is omitted in the first heating pattern (step S6), and when one cycle is completed, the process returns to the step S2. .

In this series of procedures, either the first heating pattern or the second heating pattern is selected, and the heat retention control means 93 performs heat retention. FIG. 5 shows the power-on / off timing of the heating coil 21 when the first heating pattern is selected. When the first heating pattern is selected, the heat retention control means 93
For less than a second, for example, t1 = 0.35 seconds, the heating coil 21 is energized to heat the pot 4, and then for one second or more, for example t2 = 5 seconds,
Heat is maintained in an intermittent heating cycle in which the heating coil 21 is cut off and heating of the pan 4 is stopped. However, when the heating stop time of t2 = 5 seconds has elapsed and the heating of the pan 4 is next started,
For example, the temperature of the pan 4 detected by the pan temperature sensor 15 is a predetermined value.
When the temperature is 71 ° C. or higher, the next pot heating is omitted by the pot heating omitting means 97 and the heating stop for t2 = 5 seconds is started. vice versa,
When the temperature of the pot 4 is less than 71 ° C, the pot is heated for t1 = 0.35 seconds to keep the pot 4 at a predetermined temperature of 71 ° C.

When the first heating pattern is selected, the heating stop period (t2 = 5 seconds) is set according to the following procedure. If the temperature of the pot 4 is less than 71 ° C,
The pot is heated for t1 = 0.35 seconds, and measurement is started when the heating of the pot 4 is stopped during this heating period, until the temperature of the pot 4 drops again below the predetermined heat retention temperature of 71 ° C. Measure time. If the time is 15 seconds, the heating stop time is set to a time shorter than 15 seconds, for example, t2 = 5 seconds. T2 of heating stop time set here =
5 seconds is 1/3 of 15 seconds, but preferably 1 /
Set it to less than 2 (less than 7.5 seconds). Thereby, after heating the pot 4, it is possible to prevent the temperature of the pot 4 from significantly lowering while the heating is stopped, which causes a large temperature fluctuation.
Even though the pot 4 is intermittently heated, a sufficient amount of heat required for heat retention can be secured. In order to prevent insufficient heating under specific conditions, the condition where the temperature drop is most remarkable, that is, the room temperature is set to a low temperature of about 0 to 5 ° C,
Under the condition that the power supply voltage is set to a low voltage of 80 to 90 V against the rated AC 100 V, and the amount of heat to be kept in the pot 4 is maximized, the temperature of the pot 4 becomes less than 71 ° C. It is desirable to measure the time until.

On the other hand, the heating amount of the second heating pattern is set stronger than that of the first heating pattern. In particular,
As shown in FIG. 6, when the second heating pattern is selected,
The heat retention control means 93 energizes the heating coil 21 for t3 = 1 second to heat the pan 4, and then interrupts the heating coil 21 for t4 = 7 seconds to stop heating the pan 4 in an intermittent heating cycle. Keep warm. This second heating pattern is t2 = 5 seconds or t4
= At the end of the heating stop period of 7 seconds, if the temperature of the pot 4 is less than 70 ° C, which is lower than the first temperature of 71 ° C, the heating pattern selection means 96 selects it. Therefore, when the temperature of the pan 4 is considerably lower than the first temperature which is the heat retention temperature, the second heating pattern is selected to increase the amount of heating to the pan 4 during the heat retention. Therefore, when the temperature of the pan 4 is changing in the vicinity of the heat retention temperature, the first heating pattern is selected to reduce the average heating amount to perform heat retention, and the temperature of the pan 4 is considerably lower than the heat retention temperature. in case of,
The second heating pattern is selected to increase the average heating amount and keep the temperature.

By the way, in the case of the heat-retaining pot that heats the pot 4 intermittently by the heating coil 21 which also serves as the rice cooker, the pot-heating time for heating the pot 4 is conventionally set to 1 second.
That is, after the pan 4 is heated for 1 second, an intermittent heating cycle in which the heating is stopped for 10 seconds is performed, and when the temperature of the pan 4 is equal to or higher than the heat retention temperature, the pan heating for 1 second is omitted. Further, the heating amount of the heating coil 21 at the time of keeping the temperature is about 600 W in the past.

In this embodiment, the heating coil is kept warm.
The heating amount of 21 is set to 500W, which is smaller than the conventional one, and the heating coil 2
The vibration noise during the oscillation of 1 was reduced. If the heating amount of the heating coil 21 is 500 W or less, the vibration noise can be further reduced. Also, in considering noise reduction,
When the pan heating time to energize the heating coil 21 at the time of heat retention was set to 0.3 seconds, 0.5 seconds, and 0.7 seconds of less than 1 second, the noise was confirmed. It turned out to reduce. However, if the pan heating time is too short, it is necessary to shorten the heating stop time in order to obtain the average heating amount to maintain the rice at the predetermined heat retention temperature, and the pan heating is performed more frequently than in the past. On the contrary, the result was annoying noise. Therefore, it is necessary to set the time for heating the pot in consideration of these points. In the embodiment, the time for heating the pot is set to t1 = 0.35 seconds, but when the heating amount of the heating coil 21 is set to be larger than 500 W, or the amount of heat-retaining objects stored in the pot 4 is small. In this case, t1 = 0.35 because it is not necessary to shorten the heating stop time even if the pot heating time is further shortened.
It can be set shorter than seconds to further reduce vibration noise. In this way, by setting the heating time of the pot to less than 1 second, the vibrating time that is the cause of the sound is shortened, and it is possible to obtain the effect of making it less audible as noise than in the past. Also, even if the contact portion of the pan temperature sensor 15 with the pan 4 resonates, the problem of abnormal noise is less likely to occur due to the shortened period of resonance.

On the other hand, if the pot heating time is made shorter than in the conventional case, the average heating amount of the pot 4 is reduced. Therefore, when the temperature is low, the power supply voltage is low, or when cold food is heated, there is a problem that the pan 4 is insufficiently heated and the desired heat retention temperature cannot be maintained. However, in such a case, even if the pot 4 is heated, the temperature of the pot 4 is unlikely to rise, and if the heating to the pot 4 is stopped, the temperature drops considerably. Therefore, in consideration of this point, this embodiment Then, in another second heating pattern stored in the second heating pattern storage means 95, heating is performed by increasing the average heating amount to the pan 4. This makes it possible to compensate for the insufficient heating amount and prevent a problem that the heat retention temperature cannot be maintained.

The heating amount of the heating coil 21 is increased, and moreover,
As the pot heating time, that is, the energization time of the heating coil 21 is made longer, the actual temperature of the pot 4 after the pot heating is stopped greatly increases and fluctuates with respect to the heat retention temperature. This temperature fluctuation (ripple) becomes a useless power consumption for unnecessarily energizing the heating coil 21 in the heat retention control for maintaining the rice at a predetermined temperature. Therefore, in the present embodiment, while heating the pot 4 for less than 1 second, the pot 4 is intermittently heated,
Since the heat retention control is performed more finely than the conventional one, the temperature fluctuation of the pan 4 described above becomes small. Therefore, the heating efficiency is improved especially when the pot 4 is heated for a long time, and the pot 4 is wasted.
It is possible to reduce the power consumption by preventing the heating to.

As described above, in the present embodiment, the average heating amount of the pan 4 due to the intermittent heating of the heating coil 21 is large or small in the heat retaining pot for electromagnetically heating the pot 4 by the heating coil 21 as the heating means. Different first heating pattern and second heating
First heating pattern memory for storing patterns and
It has means 94 and second heating pattern storage means 95 , and when the temperature of the pan 4 is lower than a predetermined temperature, the second heating pattern is set.
If the temperature of the pan 4 is 70 ° C. or higher, which is the predetermined temperature, the average heating amount is larger than that of the first heating pattern. The heating control means 93 is provided so that the average heating amount for heating the heating time to less than 1 second is small. In this case, if the temperature of the pan 4 is 70 ° C or higher, select the first heating pattern,
The heating time for the pan 4 is less than 1 second, and the noise associated with heating the pan during heat retention can be reduced. Further, while the pot heating time, that is, the energizing time of the heating coil 21 is made shorter than in the conventional case, the pot 4 is intermittently heated to finely control the heat, so that the temperature fluctuation of the pot 4 becomes small. Therefore, it is possible to prevent unnecessary heating of the pan 4 and reduce the power consumption. Furthermore, if the heat is maintained in the first heating pattern in which the heating time for the pan 4 is less than 1 second,
When insufficient heating occurs and the temperature does not reach the predetermined 70 ° C. or higher, the pan 4 is heated by the second heating pattern having a larger average heating amount. Therefore, even when the temperature is low, the power supply voltage is low, or when the cold or cooked rice is heated, it is possible to maintain the temperature of the object to be heated in the pan 4 at a desired temperature and compensate for the insufficient amount of heating, so that the temperature cannot be maintained.
It becomes possible to prevent such troubles.

Further, the heat retention control means 93 of the present embodiment is the first
Memorize each heating pattern and second heating pattern
First heating pattern storage means 94 and second heating pattern
If the pan 4 is below the first temperature,
Selects the first heating pattern and performs intermittent heating by heating the pan 4 for less than 1 second and by stopping the heating to stop the heating of the pan 4 for 1 second or longer. is there
When the temperature is 71 ° C or higher, the pan heating for heating the pan 4 for less than 1 second is omitted , and the pan 4 has a second temperature lower than the first temperature.
Temperature, select the second heating pattern and
The average amount of heat applied to the pan 4 is set to be larger than that of the heat pattern so that heat is maintained. With this configuration, pan 4
If the temperature is less than 71 ℃ , select the first heating pattern
Then , the heating time for the pot 4 is less than 1 second, and the noise associated with heating the pot during heat retention can be reduced. Further, while the pot heating time, that is, the energizing time of the heating coil 21 is made shorter than in the conventional case, the pot 4 is intermittently heated to finely control the heat, so that the temperature fluctuation of the pot 4 becomes small. Therefore, it is possible to prevent unnecessary heating of the pan 4 and reduce the power consumption. Further, when the temperature of the pan 4 becomes 71 ° C or higher, the heating of the pan is omitted. Therefore, it is possible to prevent the object to be heated in the pan 4 from being heated more than necessary and further reduce the power consumption. Will be possible. Also, such a pot
In the first heating pattern that heating time to 4 is less than 1 second
Insulation causes insufficient heating and reaches a certain temperature of 70 ° C or higher.
If not, another second heating pattern is used to average
The pan 4 is heated with a large amount of heat. others
Therefore, when the temperature is low, the power supply voltage is low, or cold rice is added.
Even when it is heated, it is desirable to keep the heat
Temperature can be maintained at a high temperature, and the insufficient heating amount is compensated for
It is possible to prevent problems that cannot be maintained
It

Further, the heat retention control means 93 of this embodiment has a heating period set for a time of less than 1 second, and after the heating of the pan 4 is stopped during this heating period, the temperature of the pan 4 is kept at a predetermined heat retention temperature. The heating is stopped for a period shorter than the time required for the temperature to drop below 71 ° C., and intermittent heating is performed. In this way, when the heating stop period is set, the heating stop period ends before the temperature of the pan 4 drops significantly, so that it is possible to prevent the temperature fluctuation from becoming large and heat the pan 4 intermittently. Despite the composition
A sufficient amount of heat required for heat retention can be secured. Further, in such a configuration, it is preferable that the heating stop period is set under the condition that the temperature drop of the pan 4 becomes most remarkable. Further, the heat retention control means 93 of the present embodiment uses the first heating pattern by intermittent heating of the pan heating for heating the pan 4 for less than 1 second and the heating stop for stopping the heating to the pan for 1 second or more, and the first heating pattern. The first heating pattern that stores the second heating pattern having a higher heating rate for the pan 4 than the first heating pattern , respectively.
The memory means 94 and the second heating pattern memory means 95 are provided.
And, it selects the first heating pattern when the temperature of the pot 4 is less than 71 ° C., which is the first temperature, less than 70 ° C. Temperature of the pot 4 is a second temperature lower than the first temperature In this case, the second heating pattern is selected to keep the temperature. In this case, if the temperature of the pan 4 is 70 ° C. or higher and less than 71 ° C., the first heating pattern is selected, the heating time for the pan 4 is less than 1 second, and the noise related to the pan heating during heat retention is reduced. It can be reduced. In addition, when the first heating pattern is selected, the pot 4 is intermittently heated and fine heat retention control is performed while shortening the pot heating time, that is, the energization time of the heating coil 21 as compared with the conventional case. As a result, the temperature fluctuation of the pan 4 becomes small, and unnecessary heating of the pan 4 can be prevented to reduce the power consumption. Furthermore, if the temperature is kept in the first heating pattern that makes the heating time for the pan 4 less than 1 second, if insufficient heating occurs and the temperature does not reach the predetermined 70 ° C or higher, another second heating pattern is used. The pan 4 is heated by increasing the heating rate of the pan 4. For this reason, even when the temperature is low, the power supply voltage is low, or when cold food is heated, the heat- retained object in the pan 4 can be maintained at a desired temperature, and the insufficient heating amount is compensated for to maintain the heat-retention temperature.
It is possible to prevent the problem that the degree cannot be maintained .

Further, in each of the above-mentioned constitutions, if the heating coil 21 is used as a heating means for electromagnetic induction heating by also using the pan 4 for cooking rice and keeping warm, it is not necessary to provide a dedicated heating means at the time of keeping warm. , Its configuration can be simplified.

In addition, to list the effects of the embodiment, it is usually the case that a body heater for heating the side surface of the pot 4 is also used to heat this portion and keep it warm in most cases.
As shown in this embodiment, the pot body 11 is made of aluminum, which has good heat conductivity, as the material of the pot 4, and
If the material of 11 is made thicker than 2 mm so that the heat of the heating element 12 facing the heating coil 21 is easily conducted to the side portion of the pot 4, the conventional body heater can be eliminated, and The temperature fluctuation (ripple) due to the intermittent heating of the body heater can be suppressed, and the temperature unevenness on the side surface of the pan 4 can be suppressed at the same time. Further, in this embodiment, in order to improve the heat retaining property, the side space 22 and the bottom space are formed around the pan housing portion 5 that houses the pan 4.
It is insulated in the insulation space consisting of 24. Thus, even if the conventional body heater is eliminated, it is possible to prevent the side surface of the pot 4 from being cooled and to prevent dew condensation on the side surface of the pot 4 during heat retention. Further, by reducing the average amount of heating to the pan 4, the number of times the pan 4 is heated per unit time is increased, and the heating stop time is shortened. Therefore, the heating coil
Only the part of the pan 4 facing 21 is less likely to be heated locally, the temperature difference between the side surface of the pan 4 and the bottom surface or the lower part of the side surface is suppressed, and the effect of reducing the temperature unevenness as a whole is obtained. Also, it becomes possible to reduce the condensation on the side surface of the pot 4.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the embodiment, the heating pattern is 2
Depending on the type, it may have a plurality of other heating patterns. The second heating pattern described above may have a higher heating rate than the first heating pattern. In order to increase the heating rate of the pan 4, in addition to changing the power interruption time with the same heating amount as in the present embodiment, the power interruption time remains unchanged.
The heating amount of the heating coil 21 may be increased.

[0045]

According to the first aspect of the present invention, there is provided a warming pot in which a pot, a heating means for electromagnetically heating the pot, and an average heating amount to the pot due to intermittent heating of the heating means differ from each other . One heating pattern and one second heating pattern
First heating pattern storage means and second heating pattern
It has a turn storage means, when the temperature of該鍋is lower than the predetermined temperature, selects the second heating pattern, the first
The average heating amount is larger than the heating pattern of
If the temperature of the pan is above a predetermined temperature, the first heating
It is equipped with a heat retention control means configured to select a pattern and make the average heating amount to be less than 1 second for heating the pan to reduce the noise related to the heating of the pot. In addition to the above, it is possible to provide a warming pot that can reduce power consumption. In addition, the temperature of the object to be kept in the pan can be maintained at the desired temperature, and the insufficient amount of heating is compensated for
It is possible to prevent problems that cannot be maintained .

Further, the heat insulation pot according to claim 2 of the present invention is
A pot, heating means for electromagnetically heating the pot, and a first heating unit
Store the heat pattern and the second heat pattern, respectively.
First heating pattern storage means and second heating pattern storage
Means for providing the pan if the pan is below the first temperature,
Selects the first heating pattern, subjected to intermittent heating by the heating stopped and stopping heating for at least one second of said pot to pot heating and the pot is heated less than one second,該鍋it is equal to or greater than the first temperature In some cases, the heating of the pot is omitted , and the pot is
When the temperature is lower than the second temperature lower than the temperature, the second temperature
Select a heating pattern,
It is provided with a heat retention control means for maintaining the heat by increasing the average heating amount to the pan, and it is possible to reduce noise related to heating the pan during heat retention and reduce power consumption. We can provide a warming pot. Further, it is possible to prevent the heat-retained object in the pan from being heated more than necessary, and further reduce the power consumption. Also, the items to be kept warm in the pan
Can be maintained at the desired temperature and compensate for the insufficient heating amount,
It is possible to prevent the problem that the heat retention temperature cannot be maintained .

Further, the heat insulation pot according to claim 3 of the present invention comprises:
A pot, a heating means for electromagnetically heating the pot for both rice cooking and heat retention, a first heating pattern and a second heating pattern
And a first heating pattern storage means for storing
It has two heating pattern storage means, and the pot has a first temperature.
If less than, select the first heating pattern,
Heat the pan to heat the pan for less than 1 second and heat the pan to 1
Intermittent heating is performed by stopping heating for more than a second, and when the pot is at a first temperature or higher, the pot heating is omitted ,
The pan is below a second temperature which is lower than the first temperature
In this case, the second heating pattern is selected and the first heating pattern is selected.
The average heating amount to the pan is larger than the heating pattern of
It is provided with a heat retention control means for performing heat retention, and it is possible to provide a heat retention kettle capable of reducing noise associated with heating the pot during heat retention and reducing power consumption. Furthermore, it is possible to prevent the heated object in the pan from being heated more than necessary, to further reduce the power consumption, and to simplify the configuration by using the heating means for cooking rice and keeping the temperature common. It will be possible. In addition, keep the temperature-controlled items in the pan at the desired temperature.
It can be maintained and compensates for the insufficient heating amount to maintain the heat retention temperature.
It is possible to prevent the problem of being lost .

Further, the heat insulation pot according to claim 4 of the present invention is
A pot, heating means for electromagnetically heating the pot, and a first heating unit
Store the heat pattern and the second heat pattern, respectively.
First heating pattern storage means and second heating pattern storage
Means for providing the pan if the pan is below the first temperature,
Select the first heating pattern, set the heating period for less than 1 second, and after stopping the heating of the pot during this heating period, until the temperature of the pot drops below the predetermined heat retention temperature. Intermittent heating is performed by a heating stop period set for a time shorter than the time, and when the pan is at a predetermined temperature or higher, the pan heating is omitted , and the pan is heated to the first temperature.
If the second temperature is lower than the second temperature,
Select a heat pattern and place it before the first heat pattern
It is equipped with a heat retention control means that keeps the average amount of heating to the pan large and keeps it warm, and it is possible to reduce the noise related to the heating of the pan during heat retention and reduce the power consumption. We can provide a warming pot. In addition, it is possible to prevent the objects to be heated in the pan from being heated more than necessary, to further reduce the power consumption, and to prevent the problem of large temperature fluctuations. The amount can be secured. Also, you can maintain the temperature of the object to be kept in the pan at the desired temperature,
Insufficient heating amount can be compensated for and the heat retention temperature cannot be maintained
You can prevent problems .

The heat insulation pot according to claim 5 of the present invention is
A pan, a heating means for electromagnetically heating the pan, a first heating pattern by intermittent heating of a pan heating for heating the pan for less than 1 second and a heating stop for stopping heating to the pan for 1 second or more; A first heating pattern for storing a second heating pattern having a higher heating rate for the pot than the first heating pattern is stored.
Heating pattern storage means and second heating pattern storage means
And selecting the first heating pattern when the temperature of the pan is less than a first temperature, and when the temperature of the pan is less than a second temperature that is lower than the first temperature. It is provided with a heat retention control means for selecting the heating pattern of No. 2 and maintaining the heat, and it is possible to reduce the noise related to the heating of the pan during the heat retention and to reduce the power consumption. Can be provided. In addition, it is possible to maintain the temperature of the object to be kept in the pan at the desired temperature, and to supplement the insufficient amount of heating to maintain the temperature to keep the object warm.
It is possible to prevent the problem of becoming worse .

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a microcomputer showing an embodiment of the present invention.

FIG. 2 is an overall cross-sectional view of the same warming oven.

FIG. 3 is a block diagram showing an electrical configuration of the same.

FIG. 4 is a flowchart showing a control procedure for keeping the same temperature.

FIG. 5 is a waveform diagram showing a switching pattern of the heating coil when the first heating pattern is selected.

FIG. 6 is a waveform diagram showing a current interruption pattern of the heating coil when the second heating pattern is selected.

[Explanation of symbols]

4 pan 21 heating means (heating coil) 93 heat retention control means 94 first heating pattern storage means 95 second heating pattern storage means

Claims (5)

(57) [Claims] 1. A pan, a heating means for electromagnetically heating the pan, and a first heating pattern and a second heating pattern in which the average amount of heating to the pan by intermittent heating of the heating means differs greatly.
First heating pattern memory hand that remembers each turn and
And a second heating pattern storage means , and when the temperature of the pot is lower than a predetermined temperature, the second heating pattern is selected.
Alternatively, the average heating amount is larger than that of the first heating pattern , and when the temperature of the pot is equal to or higher than a predetermined temperature, the first heating pattern is selected to A heat-retaining pot comprising: a heat-retaining control means configured to reduce the average amount of heating for a heating time of less than 1 second. 2. A pot, a heating means for heating the pot by electromagnetic induction, a first heating pattern and a second heating pattern.
A first heating pattern storage means and a second heating
Having a heat pattern storage means, wherein the pot is below a first temperature
In this case, the first heating pattern is selected, and intermittent heating is performed by heating the pan for less than 1 second and stopping heating for stopping the heating of the pan for 1 second or longer .
When the temperature is 1 or higher, the pot heating is omitted , and
If the pot is below a second temperature below the first temperature
Selects the second heating pattern and selects the first heating pattern.
A heat-retaining pot comprising: a heat-retaining control means for maintaining the heat by making the average heating amount to the pan larger than that of the pattern . 3. A pan, a heating means for electromagnetically heating the pan for both rice cooking and heat insulation, a first heating pattern and a second heating pattern.
First heating pattern for storing the respective heating patterns of
And a second heating pattern storage means,
If the pot is below the first temperature, the first heating pattern
And the heating of the pot for less than 1 second and the heating for stopping the heating of the pot for 1 second or longer are performed intermittently, and when the pot is at a first temperature or higher, the pot is heated. The heating is omitted , and the pan is lower than the first temperature.
If the temperature is lower than 2, select the second heating pattern.
The average heating to the pan rather than the first heating pattern.
A heat- retaining pot comprising a heat-retaining control means for increasing the amount of heat and maintaining the heat. 4. A pan, a heating means for electromagnetically heating the pan, a first heating pattern and a second heating pattern.
A first heating pattern storage means and a second heating
Having a heat pattern storage means, wherein the pot is below a first temperature
In this case, the first heating pattern is selected, the heating period is set for a time of less than 1 second, and after the heating of the pot in this heating period is stopped, the temperature of the pot is set to a predetermined heat retention temperature. Intermittent heating is performed by a heating stop period set in a time shorter than the time until it falls to less than, and when the pot is at a predetermined temperature or higher, the pot heating is omitted , and the pot is further
Is less than a second temperature lower than the first temperature,
Selects the second heating pattern and selects the first heating pattern.
A heat-retaining pot comprising: a heat-retaining control means for maintaining the heat by making the average heating amount to the pan larger than that of the pattern . 5. A first pot by intermittent heating of a pot, heating means for electromagnetically heating the pot, heating the pot for less than 1 second, and stopping heating for stopping the heating of the pot for 1 second or more.
Heating pattern, and more second heating pattern of the heating rate to the pan than the first heating pattern each
First heating pattern storage means and second heating pattern to be stored
A first memory pattern is selected when the temperature of the pan is lower than a first temperature, and the temperature of the pan is lower than a second temperature lower than the first temperature. In some cases, there is provided a heat retention control means for selecting a second heating pattern and performing heat retention.