JP3384333B2 - Jar rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
Relates to a jar rice cooker used for business purposes. [0002] 2. Description of the Related Art Conventionally, this type of jar rice cooker has been
For example, the configuration is as shown in FIG. 1 in the figure
Is a rice cooker body with an open top, in which rice and water
The pot 2 in which the container is placed is detachably stored. This rice cooker
Inside the body 1 is a pot heating hand for heating the bottom of the pot 2
Side 3 for heating the bottom of the pan and the side of the pan
Heating means 4 is disposed around the waist of the pot. This pot
A pan sensor for detecting the temperature of the pan 2 is located at the center of the heating means 3.
-5 are provided. 6 is the top opening of the rice cooker body
A lid that can be opened and closed freely. This lid 6 is integrated with the upper part of the upper frame 7.
The hinge member 8 is rotatably supported via the pin 9
Have been. A heat sink 10 is fixed to the lid 6.
Of the lid sensor 1 for detecting the temperature in the pan 2
1 and a lid heating means 12 for heating the lid are made of aluminum tape.
Has been pasted. 13 is a control board,
Passing through the pot heating means 3, the side heating means 4, and the lid heating means 12
The state of electricity and signals from the pan sensor 5 and the lid sensor 11
Input / output control of the signal of the operation display unit 14 is performed. In particular, when keeping rice warm, the control means 13
Indicates that the temperature of the pan sensor 5 is below a certain temperature (71 ° C.).
In case, power is supplied to the pan heating means 3 to heat it,
When it comes to time, stop supplying electricity to the pan heating means 3 and stop heating.
You. Further, the temperature of the lid sensor 11 is constant (72 ° C.).
In the following cases, the side heating means 4 and the lid heating means 12 are energized.
When the temperature rises above a certain temperature, the side heating means
4 and the heating of the lid heating means 12 are stopped, and the heating is stopped.
At this time, the input power to the various heating means is increased.
Then the temperature rises instantly, pan sensor 5 and lid sensor 11
Even if the temperature around the container exceeds a certain value,
The heat is not transmitted to the rice, so the temperature is low and the rice
Temperature will be uneven. Therefore, the whole rice is uneven
Input power to transmit heat without heat and eliminate uneven temperature.
And heating slowly. Repeat this control
By returning it, the temperature of the rice can be kept constant and warm
You. If the temperature of the rice at the time of this heat rises, the rice will dry
Or it turns yellow and, on the contrary, when the temperature drops, the smell of rice
It becomes tight or rots, and rice deteriorates. [0004] However, this is not the case.
Una jar rice cooker keeps rice warm after cooking is finished
While eating, put the lid 6 on to eat the warmed rice
Open it and eat rice. In addition, we fly off extra moisture during heat retention
In some cases, the rice may be loosened by opening the lid 6. As described above, when the lid 6 is opened,
The temperature immediately drops to room temperature, and the lid 6 cools down.
And the rice on the top of the pan 2 and the surface inside the pan 2
It will be done. Then, after the lid is closed,
Until the temperature of the rice and the temperature of the rice on the surface return to the original insulation temperature
Takes a long time, and the rice kept warm deteriorates due to the temperature drop
There was a problem to do. [0006] The present invention solves the above-mentioned problems, and
Open and close the lid while keeping the rice warm without compromising the heat retention performance
Even if it is done, in a short time, in the pot cooled by opening and closing the lid
Return the temperature to the original temperature, use no wasted power, and heat
Do not over-dry the rice, always at a constant temperature
Providing a rice cooker that can keep rice warm1Purpose and
Is what you do. [0007] The first object is achieved.
SUMMARY OF THE INVENTION The present invention provides a main body and a lid for covering an upper part of the main body.
And a pan removably stored in the main body, and the pan
Heating means for heating;Lid heating means for heating the lid,
The heating meansAnd the lid heating meansControl hand to supply power to
A step, and a lid open / close detecting means for detecting the open / closed state of the lid.
Wherein the control means is provided forAfter the lid is opened
When it is detected that the lid is closed, it is supplied to the lid heating means.
So that the power to be supplied is higher than before the lid can be opened
Controlling the lid heating means, and supplying electric power to be supplied to the lid heating means.
Even after detecting the opening and closing of the lid within a certain time after increasing
Do not increase the power supplied to the lid heating means again
lidThe heating means is controlled. [0008] DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 comprises a main body,
A lid for covering the top of the main body,
A pot to be stored, heating means for heating the pot,The lid
Lid heating means for heating;The heating meansAnd the lid heating means
Control means for supplying power to the power supply, and detecting whether the lid is open or closed
Lid opening / closing detecting means,
To detect that the lid is closed after the lid is opened
Before the power supplied to the lid heating means is opened.
The lid heating means is controlled to increase the
Within a certain period of time after increasing the power supplied to the heating means
Electric power supplied to the lid heating means again even if the lid is opened or closed
The lid so as not to increaseBy controlling the heating means
The lid was closed after the lid was opened while keeping the rice warm
Detected, the power supplied to the lid heating means
Control the lid heating means so that it increases before opening
To open and close the lid while keeping the rice warm.
Only then increases the input power to the lid heating means
To heat the lid and use no wasted power,How many times during the heat retention
Even if the lid is opened and closed,Rice is dried by overheating
Without raising the temperature of the lid in a short time and opening the lid.
Return the temperature inside the pot cooled by closing to the original temperature, and
We can always keep rice warm at a constant temperature without compromising heat performance
You. [0009] Example (Example 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
Will be described. As shown in the block diagram of FIG.
Is rice and water, heated by inverter 32
Pot heating means 33 composed of a coil, and a side for heating the side
Heated by the heating means 34. 35 is the pan 31
A radiator plate that covers the upper surface.
A lid heating means 36 for heating, and a lid
The sensor 37 is attached. 38 is the bottom of the pot 31
A pot sensor that detects temperature. Also, the lid opening / closing detection hand
The step 39 detects the open / closed state of the lid that covers the upper surface of the pot 31.
Things. The control means 40 controls the output of the pan sensor 38 and
Input the output of lid sensor 37 and the amount of rice and water in pot 31
That is, the rice cooking amount determining means 41 for determining the rice cooking amount,
The pot heating means 33 and the side surface are output by the output of the rice cooking amount determination means 41.
Determine the heating output of the heating means 34 and the lid heating means 36,
Input the output of sensor 38 and the output of lid sensor 37
Pot heating means 33 and side heating hand based on rice cooking sequence
The heating output of the step 34 and the lid heating means 36 is controlled, and
The display means 42 for displaying the state of the rice cooker and the abnormality of the rice cooker, etc.
Rice cooking control means for outputting a signal to the informing means 43 for informing
44 and storage means 45 for storing the rice cooking sequence.
Has been established. The operation means 46 is stored in the storage means 45.
To select a cooked rice sequence or start cooking
Is output to the storage means 45. A specific example of this rice cooker is shown in FIGS.
In FIG. 2, reference numeral 47 denotes a rice cooker body having an open upper surface.
Pot 31 for putting rice and water in the main body 47
Have been. Inside the main body 47, a pot for heating the pan 31 is provided.
A pan heating means 33 comprising a heat coil, and a pan heating means 33
Inverter board 48 on which inverter 32 to be driven is mounted
And a side heating means 34 for heating the side of the pan 31 are provided.
ing. In the center of the pan heating means 33, the temperature of the pan 31
Is provided. 49 is cooking
This lid covers the upper opening of the rice cooker body 47 so that it can be opened and closed.
The lid 49 is a hinge member 5 integrally formed on the upper part of the upper frame 50.
1 is rotatably supported via a pin 52. Lid 4
6, a heat radiating plate 35 is fixed.
Is the temperature of the lid heating means 36 for heating the lid and the temperature of the heat sink 35.
The lid sensor 37 for detection is attached
ing. Also, a control board 54 is provided in the lid 49.
I have. This control board 54 is a microcontroller as a control means.
Computer 55, display means LCD 56, and notification means.
A certain buzzer 57 and operation means 46 are mounted. Change
In the lid 49, a float 58 and a float detection 59 are provided.
Is provided. The microcomputer 55 is a pan sensor
38 and the output of the lid sensor 37,
Determination of the amount of rice and water inside, that is, the amount of rice cooked
Means 41 and the output of the cooked rice amount determining means 41.
Heating of heating means 33, side heating means 34 and lid heating means 36
Determine the output, the output of the pan sensor 38 and the lid sensor 37
Input the output of the rice cooker sequence based inverter
32 to control the heating output of the heating means 33 and the side heating means.
34 and the heating output of the lid heating means 36, and
LCD56 indicating the status of the cooker and notification of abnormalities in the rice cooker
Rice cooker control means 44 for outputting a signal to a buzzer 57
And a storage means 45 for storing a rice cooking sequence.
ing. The operating means 46 is provided in the microcomputer 55
Select rice cooking sequence stored in storage means 45
The microcomputer 55 sends a signal to start cooking or cooking rice.
Is output to FIG. 3 is an enlarged view of the lid opening / closing detecting means 39.
It is. The float 58 is a spherical magnet.
The port detection 59 opens and closes the contacts by the magnetism of the float 58
Reed switch. Float 58 is an inclined groove
60, the lid 49 is closed and the flow
The port 58 moves to the float detection 59 side, and
Float 58 is opposite to float detection 59 when open
Move to the side. The movement of the float 58 causes the float
Float detection 59 because the effect of magnetism on detection 59 changes
This opens and closes the contacts, enabling the detection of the opening and closing of the lid. In addition, one of the main body 47 and the lid 49
Dispose the reed switch on the magnet and the other
There is also a method of detecting closing. In the above configuration, the jar according to the present invention
The operation of the rice cooker when keeping warm will be described with reference to FIGS.
You. FIG. 4 shows rice in a jar rice cooker according to an embodiment of the present invention.
FIG. 4 is a heat retention sequence diagram when the heat is
And the detected temperatures of the pan sensor 38 and the lid sensor 37.
Degree, pan heating means 33, side heating means 34 and lid heating means
36 shows the input power to 36. Also, FIG.
It is an operation diagram at the time of lid opening and closing detection when the lid is opened and closed, and a pan sensor
-38 and the temperature detected by the lid sensor 37 and the rice kept warm
Surface temperature, the ambient temperature in the pan 31, and the pan heating means 33
And input power to the side heating means 34 and the lid heating means 36.
are doing. The microcomputer 55 includes an operation unit 4
6 receives the signal input from
Rice cooked and stored in the storage means 45 inside the computer 55.
Pot sensor 38 and lid sensor based on temperature sequence
37 and an output signal from the lid opening / closing detecting means 39 are input signals.
To control the heating of the jar rice cooker. [0017] In order to keep the cooked rice warm,
Immediately after the temperature of the rice is about 100 ℃
However, the normal temperature of rice is about 71 ℃.
And this temperature is taken as the stable temperature at the time of heat retention. And
During the warming, the rice temperature is controlled so that the rice temperature is optimally controlled.
The process different in the amount of heating is provided according to. This
In the state of, the temperature of the rice and the temperature of the pan 31 are almost the same.
The temperature of the rice according to the temperature detected by the pan sensor 38
Can control. The microcomputer 55 finishes cooking rice.
Later, in the heat keeping lowering step, the temperature detected by the pan sensor 37 is
Lower the temperature as quickly as possible until the temperature reaches 71 ° C
Therefore, pot heating means 33, side heating means 34 and lid heating means
The power supply to 36 is stopped, and the heating is stopped. And hot pot Sen
When the temperature detected by the sensor 38 falls below 71 ° C, the heat insulation temperature adjustment
Move to about. In the warming temperature control process, the detection of the pan sensor 38 is performed.
If the temperature is 71 ° C or less, energize the pan heating means 33
(1 second ON / 16 second cycle) and heating, then again
When the temperature detected by the pan sensor 38 exceeds 71 ° C,
The power supply to the heating means 33 is stopped to stop the heating, and
If the temperature detected by the heater 37 is 72 ° C. or lower, the side heating means
34 and the lid heating means 36 (2 seconds on / 16 seconds cycle).
Period) and heating, and the lid sensor 37 detects again
When the temperature reaches 72 ° C. or higher, the side heating means 34 and the lid are heated.
The power supply to the means 36 is stopped, heating is stopped, and this operation is repeated.
return. With this operation, the temperature of rice can be kept low during warming.
It can be kept at a constant temperature. Pot heating means 33 and side heating
Means 34 and the lid heating means 36 have the above-mentioned duty ratios
In the meantime, because only the area around the heating means is rapidly heated,
Temperature around pan sensor 38 and lid sensor 37 is constant
Even if it becomes the above, the heat will reach the center of the rice in the pot 31
Because it is not transmitted, the temperature is low and the temperature of the rice can be uneven
Would. Therefore, it is possible to keep the heat
The temperature of rice and the temperature of the atmosphere in the pot 31 are kept constant
It is kept in. In FIG. 5, t1 during this temperature control step
If the lid 49 is opened at the timing,
Stable at almost the same temperature (approximately 71 ° C) as the detection temperature of Cir 38
The heat sink 35 of the lid 49 inside the pot 31 and the surface of the rice
Hits the outside air and is rapidly cooled to the outside temperature.
U. However, the pan sensor 38 is located at the bottom of the pan 31.
Is not directly affected by the outside air,
Even if there is opening and closing, there is almost no difference in the detected temperature. Ma
The rice in the bottom of the pot 31 is exposed to the open air.
Since the lid 49 is not open and closed,
Even so, the temperature hardly drops. Then, at t2
Conventionally, even if the lid 49 can be closed by
Pewter 55 simply detects the temperature of pan sensor 38
Is detected and each heating is performed with the same input power as before.
Since the means was heated, rice was cooked after lid 49 was closed
Surface temperature and the ambient temperature in the pot 31 are stable at the original temperature.
It took about 20 minutes to return. However, in the embodiment of the present invention, the lid opening / closing detection is performed.
The means 39 detects opening and closing of the lid 49, and
The cover 55 is opened by the output from the lid opening / closing detecting means 39.
When the opening is detected, the input power to the lid heating means 36 is input.
The force is increased to a duty cycle of (8 seconds on / 16 seconds cycle). This
Of the radiator plate 35 is cooled by outside air
Pan 3 after the lid 49 is closed.
The temperature of the atmosphere rises sharply in 1 and the atmosphere
Return the temperature to the original stable temperature. At this time, the table of rice
The surface temperature also increases as the temperature of the atmosphere increases. As described above, according to the present embodiment, the rice is kept warm.
When the lid 49 is opened and closed during the meal
The side of the pot 31, the surface of the rice, and the heat sink 35 of the lid 49
It hits outside air and is suddenly cooled down to outside temperature
However, the microcomputer 55 includes a lid opening / closing detecting unit 39.
Detecting that the lid 49 has been opened by the
36 so that the power supplied to the cover 36 increases.
Control. Therefore, the lid 49 is opened while keeping the rice warm.
Only then, the input power to the lid heating means 36 is increased.
To prevent the heat sink 35 from being cooled by outside air.
After the lid 49 is closed, the temperature of the lid 49
A pot that is rapidly cooled and opened and closed in a short time
31 can be raised and returned to the original temperature.
It can prevent hot rice from deteriorating due to temperature drop.
Wear. (Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.
The configuration is the same as that of the first embodiment.
Only different operations will be described. In Example 1, the microcontroller
The computer 55 is configured such that the lid opening / closing detecting means 39
Is detected, and the output from the lid open / close
Is detected, the input to the lid heating means 36 is performed.
Increased power to (8 seconds on / 16 seconds cycle)
However, in the present embodiment, the microcomputer 55
The closing detecting means 39 detects opening and closing of the lid 49, and opens the lid 49.
After that, the lid is heated after detecting that the lid 49 is closed.
Pass the input power to the means 36 (8 seconds on / 16 seconds cycle)
Increase to electric power. And the detection temperature of the lid sensor 37
However, a temperature that is 3 ° C higher than the stable temperature during warming (72 ° C) is detected.
Heat at the increased duty cycle until
The operation is returned to the electric conductivity and the operation of the temperature control step is resumed. On the other hand, the rice at the bottom of the pot 31 is
When opening and closing the lid, the temperature does not drop suddenly.
As with the parts, there is no need to heat. Therefore, my
The black computer 55 detects the temperature detected by the pan sensor 38.
However, when the temperature becomes lower than the heat-stabilizing temperature (71 ° C),
The energization of the heating means 33 is turned on (1.2 seconds on / 16 seconds cycle).
The heating is performed at the power supply rate.
When the temperature exceeds ℃, the power supply to the pan heating means 33 is stopped and heating is started.
Stop and repeat this operation. At this time, the pan heating means 33
Is higher than that before opening and closing the lid 49.
I did, but depending on the amount of rice and the opening and closing time of the lid 49,
You do not need to change. However, during the temperature control step, the temperature of the rice
However, when the temperature drops below the stable temperature during heat insulation, the heat insulation performance
It is necessary to prevent deterioration, but on the contrary,
Needs to reduce the temperature of rice in as short a time as possible
So, in the process of changing the temperature of rice,
Even if 49 is opened and closed, each heating according to the opening and closing
There is no need to increase the duty ratio of the means. As described above, according to the present embodiment, rice is kept warm.
In the process of keeping the temperature of the rice inside constant, to improve the rice
When the lid 49 is opened and closed, the side of the pot 31 and the rice
The surface and the heat radiating plate 35 of the lid 49 are exposed to the outside air,
Although it is cooled down to the temperature, the microcomputer 5
5 is a case where the lid 49 is opened by the lid opening / closing detecting means 39.
Later, after detecting that the lid 49 is closed, the lid sensor
37 detected temperatures are higher than the stable temperature during warming
Until the power supplied to the lid heating means 36 increases.
To control the lid heating means 36,
Pot heating means so that the detected temperature becomes a stable temperature during warming
The energization control to 33 is performed. After that, the operation of the temperature control process
Return to work. Therefore, the temperature of the rice is kept constant while the rice is kept warm.
When the lid 49 is opened in a process that needs to be
9 is closed and the input power to lid heating means 36 is increased
Heat the lid 49 while the lid 49 is open
Even though it only radiates heat to the outside air,
It does not use waste power and is cooled by opening and closing the lid 49.
Separately and the uncooled part, depending on the temperature
Control, heat radiator plate 35 may be overheated,
The surface of the rice and the atmosphere in the pan 31 are too hot
The rice is not too dry and the lid
The temperature of the part is raised, and the pan 3 cooled by opening and closing the lid 49
Return the temperature in 1 to the original temperature, impairing the conventional heat retention performance
The rice can always be kept at a constant temperature,
Deterioration due to temperature drop can be prevented. (Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.
The configuration is the same as that of the second embodiment.
Only different operations will be described. In Example 2, the microcontroller
The computer 55 is configured such that the lid opening / closing detecting means 39
Was detected, and after the lid 49 was opened, the lid 49 was closed.
Is detected, and then the input power to the lid heating means 36 is reduced (for 8 seconds).
(On / 16 second cycle), but increased in this embodiment.
The microcomputer 55 includes a lid opening / closing detecting unit 39.
Detects opening and closing of the lid 49, and after the lid 49 is opened, the lid 4
9 is detected, and then to the side cover heating means 34
Input power is increased to (8 seconds ON / 16 seconds cycle) duty ratio
Let it. When the temperature detected by the lid sensor 37 is
Until a temperature 3 ° C higher than the stable temperature (72 ° C) is detected.
Heating at the increased duty ratio, and then return to the original duty ratio.
And restart the temperature control. As described above, according to this embodiment, the rice is kept warm.
In the process of keeping the temperature of the rice inside constant, to improve the rice
When the lid 49 is opened and closed, the side of the pot 31 and the rice
The surface and the heat radiating plate 35 of the lid 49 are exposed to the outside air,
Although it is cooled down to the temperature, the microcomputer 5
5 is a case where the lid 49 is opened by the lid opening / closing detecting means 39.
Later, after detecting that the lid 49 is closed, the lid sensor
37 detected temperatures are higher than the stable temperature during warming
Until the power supply to the side heating means 34 increases
Control the side heating means 34 while the pan sensor 3
Heat the pot so that the detected temperature of 8 becomes the stable temperature at the time of heat retention
The power supply to the means 33 is controlled. After that, the temperature control process
Return to the operation of. Therefore, the temperature of the rice is kept constant while the rice is kept warm.
When the lid 49 is opened in a process that needs to be
Input power to side heating means 3 increases after 9 is closed
So that no wasted power is used and the lid 49 is opened and closed.
Separate the cooled and uncooled parts
Since the temperature is controlled by the temperature, the side of the pan 31 is heated.
The atmosphere on the surface of the rice and the pot 31 was too high
And overheating the rice can cause the rice to dry
Without increasing the temperature of the side of the pot 31 in a short time,
Return the temperature inside the pan 31 cooled by opening and closing 49 to the original temperature
And always keep rice at a constant temperature without impairing the conventional heat retention performance
Can keep warm, and the rice kept warm will deteriorate due to the temperature drop
Can be prevented. (Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS.
The configuration is the same as that of the second embodiment.
Only different operations will be described. The microcomputer 55 detects the opening and closing of the lid.
Means 39 detects opening and closing of lid 49, and lid 49 is opened.
Then, after detecting that the lid 49 is closed, the lid heating means 3
6 to increase the duty ratio of the input power. At this time, increased
The energization rate to be cooked is determined by the rice cooked amount determination means 41.
The amount is the amount of heat insulation for rice.
For example, set to (6 seconds on / 16 seconds cycle)
Set the duty ratio to (10 seconds on / 16 seconds cycle)
You. When the temperature detected by the lid sensor 37 is stable when the temperature is stable.
Until a temperature 3 ° C higher than the detected temperature (72 ° C) is detected.
Heating at the increased duty ratio, and then return to the original duty ratio.
Then, the operation of the temperature control step is restarted. As described above, according to the present embodiment, rice is kept warm.
In the process of keeping the temperature of the rice inside constant, to improve the rice
When the lid 49 is opened and closed, the side of the pot 31 and the rice
The surface and the heat radiating plate 35 of the lid 49 are exposed to the outside air,
Although it is cooled down to the temperature, the microcomputer 5
5 is a case where the lid 49 is opened by the lid opening / closing detecting means 39.
Later, after detecting that the lid 49 is closed, the lid sensor
37 detected temperatures are higher than the stable temperature during warming
Until the power supplied to the lid heating means 36 is kept warm.
The lid heating means 36 is controlled so as to increase according to the amount of rice.
On the other hand, the temperature detected by the pan sensor 38 is stable when kept warm.
The energization control to the pot heating means 33 is performed so that the temperature becomes the temperature.
U. Thereafter, the operation returns to the operation of the temperature control step. Therefore, the temperature of the rice is kept constant while the rice is kept warm.
When the lid 49 is opened in a process that needs to be
Keeps the input power to lid heating means 36 after 9 is closed
Wasted electricity because it is increased according to the amount of rice
Not used, and the part cooled by opening and closing the lid 49
Uncooled parts are controlled separately by temperature
So, overheat the heat sink 35 or overheat the rice
The surface of the rice and the atmosphere in the pot 31
The rice is not dried and the temperature of the lid 49 is short.
The temperature in the pot 31 cooled by opening and closing the lid 49.
Return the temperature to the original temperature, without impairing the conventional heat retention performance,
Can also keep rice warm at a constant temperature, and the temperature of the rice kept warm decreases
Can be prevented from deteriorating. (Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS.
The configuration is the same as that of the second embodiment.
Only different operations will be described. The microcomputer 55 detects the opening and closing of the lid.
Means 39 detects opening and closing of lid 49, and lid 49 is opened.
Then, after detecting that the lid 49 is closed, the lid heating means 3
6 to increase the duty ratio of the input power. At this time, the microphone
After the lid 49 is opened at t1, the computer 55
The time until closing at t2 is measured. This lid opening time
However, if the time is 5 seconds or more and 30 seconds or less, the lid 49 is closed.
Is detected, the input power to the lid heating means 36 is reduced to (8
Second ON / 16 second cycle), and the lid opening / closing time
In the case of 30 seconds or more, the input power to the lid heating means 36 is
(10 second ON / 16 second cycle). So
Then, the detection temperature of the lid sensor 37 becomes
Increase until a temperature 3 ° C higher than (72 ° C) is detected.
Heating at the specified duty ratio, and then return to the original
The operation of the adjustment process is restarted. On the other hand, the lid opening time is less than 5 seconds
In this case, even if the lid is closed, the input power to the lid heating means 36
The operation of the temperature control step is performed without changing the force. As described above, according to the present embodiment, rice is kept warm.
In the process of keeping the temperature of the rice inside constant, to improve the rice
When the lid 49 is opened and closed, the side of the pot 31 and the rice
The surface and the heat radiating plate 35 of the lid 49 are exposed to the outside air,
Although it is cooled down to the temperature, the microcomputer 5
5 is a case where the lid 49 is opened by the lid opening / closing detecting means 39.
Then, the lid opening time until the lid 49 is closed is measured.
The space is between the side of the pot 31, the surface of the rice, and the heat sink 35 of the lid 49.
If it is shorter than cooling to the outside air temperature, cover heating means 3
6 does not change, and its lid opening time
In the above case, the lid 49 is opened by the lid opening / closing detecting means 39.
After detecting that the cover 49 is closed,
Temperature at which the temperature detected by the sensor 37 is higher than the stable temperature during warming
Until power is detected, the power supplied to the lid heating means 36 is not
Control the lid heating means 36 to increase with time,
On the other hand, the detection temperature of the pan sensor 38 is
Thus, the power supply to the pot heating means 33 is controlled. That
Thereafter, the operation returns to the operation of the temperature control step. Therefore, the temperature of the rice is kept constant while the rice is kept warm.
When the lid 49 is opened in a process that needs to be
Measure the lid opening time until 9 is closed, and the time is
Open the side of the pot 31, the surface of the rice, and the heat sink 35 of the lid 49 to outside air.
If it is shorter than cooling down to the temperature,
The input power remains unchanged, above which the lid 49 is closed
Input power to the lid heating means 36 before the lid 49 is opened.
Increase according to the time spent, without wasting power,
In addition, the part cooled by opening and closing the lid 49 is cooled.
The parts that do not are separately controlled by temperature, so heat dissipation
Overheating the plate 35, overheating the rice,
The surface of the rice and the atmosphere in the pot 31 are too high and the rice is dry
The temperature of the lid 49 can be raised in a short time without drying.
The temperature inside the pan 31 cooled by opening and closing the lid 49 to the original temperature.
Return to the normal temperature without deteriorating the conventional heat retention performance.
Can keep rice warm, and the rice kept warm deteriorates due to temperature drop
Can be prevented. (Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to FIGS.
The configuration is the same as that of the second embodiment.
Only different operations will be described. The microcomputer 55 detects the opening and closing of the lid.
Means 39 detects opening and closing of lid 49, and lid 49 is opened.
Then, after detecting that the lid 49 is closed, the lid heating means 3
6 input power to (8 seconds on / 16 seconds cycle) duty ratio
increase. Then, the temperature detected by the lid sensor 37 is maintained.
Detects a temperature that is 3 ° C higher than the hot stable temperature (72 ° C)
Or increased until a certain time T1 (about 6 minutes) elapses
Heat at the duty ratio, and then return to the original duty ratio to control the temperature
Restart the operation of the process. The certain time T1 at this time is usually
In the heat retention state, the detection temperature of the lid sensor 37 is
Until the temperature becomes 3 ℃ higher than the stable temperature (72 ℃)
On the contrary, rice is not too yellowed by heating,
Further, by increasing the electricity supply rate to the lid heating means 36,
The components of the rice cooker do not deteriorate or break down due to heat.
It is set to such a time. As described above, according to the present embodiment, rice is kept warm.
In the process of keeping the temperature of the rice inside constant, to improve the rice
When the lid 49 is opened and closed, the side of the pot 31 and the rice
The surface and the heat radiating plate 35 of the lid 49 are exposed to the outside air,
Although it is cooled down to the temperature, the microcomputer 5
5 is a case where the lid 49 is opened by the lid opening / closing detecting means 39.
Later, after detecting that the lid 49 is closed, the lid sensor
37 detected temperatures are higher than the stable temperature during warming
Or until the predetermined time has passed, the lid heating means 36
Control the lid heating means 36 so that the supplied power increases
On the other hand, the temperature detected by the pan sensor 38 is a stable
The energization control to the pot heating means 33 is performed so that the temperature is high.
Thereafter, the operation returns to the operation of the temperature control step. Therefore, the temperature of the rice is kept constant while the rice is kept warm.
When the lid 49 is opened in a process that needs to be
9 is closed and the input power to lid heating means 36 is increased
So that no wasted power is used and the lid 49 is opened and closed.
Separate the cooled and uncooled parts
In addition, since the temperature is controlled by the temperature, the heat radiating plate 35 is excessively heated.
Or overheat the rice, and the rice surface or pan 31
The atmosphere inside is too high and the rice does not dry,
Raise the temperature of the lid 49 in a short time and open and close the lid 49
The temperature in the cooled pot 31 is returned to the original temperature, and
We can always keep rice warm at a constant temperature without impairing the heat performance,
Prevents the rice kept warm from deteriorating due to the temperature drop
You. Furthermore, in the unlikely event that the lid sensor 37 is improperly mounted,
Even when the temperature of the heat sink 35 cannot be detected normally,
When the fixed time comes, the heating rate is restored, so overheating
Makes the rice yellow and over-dried, making up a rice cooker
The components can be prevented from being deteriorated or destroyed by heat. (Embodiment 7) Hereinafter, a seventh embodiment of the present invention will be described with reference to FIGS.
The configuration is the same as that of the second embodiment.
Only different operations will be described. The microcomputer 55 detects the opening and closing of the lid.
Means 39 detects opening and closing of lid 49, and lid 49 is opened.
Then, after detecting that the lid 49 is closed, the lid heating means 3
6 input power to (8 seconds on / 16 seconds cycle) duty ratio
increase. Then, the temperature detected by the lid sensor 37 is maintained.
Detects a temperature that is 3 ° C higher than the hot stable temperature (72 ° C)
Until it reaches the original duty ratio.
Then, the operation of the temperature control step is resumed. At this time,
The time after returning the rate is measured, and a certain time T2 (about 10
If the opening and closing of the lid 49 is detected again within
The duty ratio of the input power to the heating means 36 is not increased. That
Later, after a certain time T2 has elapsed, the opening and closing of the lid 49 is detected.
In this case, the input power to the lid heating means 36 is turned on (for 8 seconds).
/ 16 second cycle). At a certain time at this time
During the interval T2, the power supply rate to the lid heating means 36 is continuously increased.
The components that make up the rice cooker deteriorated due to heat
The time is set so that it will not be destroyed. As described above, according to this embodiment, the rice is kept warm.
In the process of keeping the temperature of the rice inside constant, to improve the rice
When the lid 49 is opened and closed, the side of the pot 31 and the rice
The surface and the heat radiating plate 35 of the lid 49 are exposed to the outside air,
Although it is cooled down to the temperature, the microcomputer 5
5 is a case where the lid 49 is opened by the lid opening / closing detecting means 39.
Later, after detecting that the lid 49 is closed, the lid sensor
37 detected temperatures are higher than the stable temperature during warming
Until the power supplied to the lid heating means 36 increases.
To control the lid heating means 36,
Pot heating means so that the detected temperature becomes a stable temperature during warming
The energization control to 33 is performed. After that, the operation of the temperature control process
Return to work. Then, once the power is supplied to the lid heating means 36.
When the power is increased, the power is re-applied until a certain time elapses.
Do not increase. Therefore, the temperature of the rice is kept constant while the rice is kept warm.
When the lid 49 is opened in a process that needs to be
9 is closed and the input power to lid heating means 36 is increased
So that no wasted power is used and the lid 49 is opened and closed.
Separate the cooled and uncooled parts
In addition, since the temperature is controlled by the temperature, the heat radiating plate 35 is excessively heated.
Or overheat the rice, and the rice surface or pan 31
The atmosphere inside is too high and the rice does not dry,
Raise the temperature of the lid 49 in a short time and open and close the lid 49
The temperature in the cooled pot 31 is returned to the original temperature, and
We can always keep rice warm at a constant temperature without impairing the heat performance,
Prevents the rice kept warm from deteriorating due to the temperature drop
You. Furthermore, even if the lid 49 is repeatedly opened and closed many times,
Rice may turn yellow or dry too much,
Components can be prevented from being deteriorated or destroyed by heat.
You. [0047] As described above, the first aspect of the present invention provides
A main body, a lid covering an upper portion of the main body,
A pot that is freely stored, and a heating unit that heats the pot,
Lid heating means for heating the lid,The heating meansAnd the lid
Heating meansControl means for supplying power to the
Lid open / close detecting means for detecting the state
Is when warmThe lid was closed after the lid was opened
Is detected, the power supplied to the lid heating means opens the lid.
Control the lid heating means to increase from before
Then, after increasing the power supplied to the lid heating means,
Even if the opening and closing of the lid is detected within a fixed time,
Heat the lid so as not to increase the power supplyControl means
To open and close the lid while keeping the rice warm.
Only then increases the input power to the lid heating means
Heat the lid, use no wasted power, and keep the lid
Even if you open and close the
The temperature in the pot cooled by opening and closing the lid in a short time
Raise and return to the original temperature, without impairing the conventional heat retention performance,
The rice can always be kept at a constant temperature, and the rice being kept warm
Deterioration due to reduction can be prevented. In addition, a rice cooker
The constituent parts can be prevented from being deteriorated or destroyed by heat.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram of a jar rice cooker according to a first embodiment of the present invention; FIG. 2 is a cutaway view of a main part of the jar rice cooker; FIG. FIG. 4 is a diagram showing a heat retaining sequence of a jar rice cooker. FIG. 5 is a diagram illustrating an operation when detecting the lid open / close of a jar rice cooker. FIG. 31 Pot 33 Pot heating means 34 Side heating means 35 Heat sink 36 Cover heating means 37 Cover sensor 38 Pot sensor 39 Cover opening / closing detecting means 40 Control means 41 Cooking rice determining means 44 rice cooking control means 45 storage means 47 main body 49 lid 55 microcomputer

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masaaki Shibata 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Masahiro Koyama 1006 Kadoma, Kazuma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. JP-A-61-222417 (JP, A) JP-A-3-191918 (JP, A) JP-A-7-313355 (JP, A) Japanese Utility Model Showa 56-176620 (JP, U) (Int.Cl. ⁷ , DB name) A47J 27/00 A47J 27/14

Claims (1)

(57) [Claim 1] A main body, a lid covering an upper part of the main body, a pan removably stored in the main body, a heating means for heating the pan, and a lid. Lid heating means for heating , a control means for supplying power to the heating means and the lid heating means ,
Comprising a lid open / close detection means for detecting the open / closed state of the lid,
The control means is configured such that the lid is opened after the lid is opened at the time of heat retention.
When it is detected that the lid is closed, the lid is supplied to the lid heating means.
Heat the lid so that power is increased before opening the lid
Means to increase the power supplied to said lid heating means.
After that, even if the opening and closing of the lid is detected within a certain time,
A jar rice cooker in which the lid heating means is controlled so as not to increase the power supplied to the heating means.