JPH05305029A - Jar rice boiler - Google Patents

Abstract

PURPOSE:To report a reheating action and shorten the reheating period when the rice temperature is high by displaying the reheating action state when reheating is started, performing the reheating action for a long period if the detected temperature when the reheating action is started is lower then the second temperature, and completing the reheating action in a short period if the detected temperature is the second temperature or above. CONSTITUTION:A microcomputer 47 receives the detection signals from a side face temperature sensor 13 and a cover temperature sensor 23, outputs display data to a display circuit 51 from an output port, controls a heater control circuit 43 via a driving circuit 54, and controls a heating device control circuit 44 via a driving circuit 55. When a heat retaining/hot switch is operated, an induction coil barrel heater and a cover heater are turned on if the detected temperature of the temperature sensor 13 is lower than 85 deg.C, and 10min. is displayed on an indicator, for example. If the detected temperature is 85 deg.C or above, 1min. is displayed on the indicator. After 1min elapses, if the detected temperature is lower than 90 deg.C, the barrel heater and the cover heater are controlled to OFF>=90 deg.C>ON.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jar rice cooker for controlling the temperature of a rice cooking container after the rice is cooked.

[0002]

2. Description of the Related Art Conventionally, in this type of jar rice cooker,
When the rice cooking start switch is operated with a predetermined amount of rice and water stored in the rice cooking container, the rice heating heater is continuously energized to start the heating operation, and boiling is detected by the temperature detected by the temperature sensor. After that, a rapid temperature rise is detected, the rice cooking operation is terminated, and the operation is shifted to a constant time wiping operation.
During this stripping operation, the heat retention heater is continuously turned on as shown in FIG. 11 (b), and the rice cooking heater is turned on for a short time in the middle as shown in FIG. 11 (a). Then, when the purging operation for a certain period of time ends, the heat retaining operation starts. In this heat retention operation, the rice temperature in the rice cooking container is controlled to be kept at a constant temperature, for example, around 73 ° C, so the heat retention heater is turned off until the rice temperature drops to 73 ° C or less, and the rice temperature is 73 ° C or less. When the temperature drops to, the heat retention heater is turned on, and thereafter, the heat retention heater is turned on and off to maintain a constant temperature.

When a switch operation for reheating is performed during the heat retaining operation, the reheating operation is started and the operation is notified by a display, and the rice cooking heater is intermittently turned on as shown in FIG. 11 (a). As shown in FIG. 11 (b), the heat retention heater is continuously turned on during the process, and when the temperature detected by the temperature sensor reaches 90 ° C., the rice cooking heater is turned off and the heat retention heater is turned on intermittently. After 10 minutes, the reheating operation was terminated and the normal heat retaining operation was started again. Further, when the temperature detected by the temperature sensor exceeds 80 ° C. during heat retention, the reheating operation is not started even if the switch operation for reheating is performed.

[0004]

However, since it is not known to the user whether or not the temperature detected by the temperature sensor exceeds 80 ° C. during heat retention, the detected temperature exceeds 80 ° C., that is, as shown in FIG. A switch operation for reheating may be performed in the temperature range indicated by the shaded areas E1 and E2. However, since the reheating operation is not performed and the display is not performed by this switch operation, there is a problem that the user misunderstands that the failure has occurred.

Therefore, according to the present invention, when the reheating operation is performed while the temperature is kept warm, the reheating operation can be notified regardless of the temperature state, and therefore, there is no fear that the user will mistakenly consider it as a failure, and the rice temperature is high. It is an object of the present invention to provide a jar rice cooker that can quickly supply a user with high-temperature rice by shortening the reheating time when reheating is started in the state.

[0006]

Means for Solving the Problems The present invention relates to a jar rice cooker that heats a rice cooking container to perform a rice cooking operation, and controls the temperature of the rice cooking container after completion of the rice cooking, and a temperature detecting means for detecting the temperature of the rice cooking container, Reheating control means for reheating the rice temperature in the cooked rice container to the first temperature lower than the boiling temperature based on the temperature detected by the temperature detection means, and temperature detection at the time of starting reheating by this reheating control means Determination means for determining whether or not the detected temperature of the means is equal to or higher than a second temperature lower than the first temperature, and reheating operation time by the reheating control means when the detected temperature is equal to or higher than the second temperature by the determination means Is set to be relatively short, and when the temperature is lower than the second temperature, reheating operation time setting means for setting the reheating operation time by the reheating control means to be relatively long, and display means for displaying the reheating operation state. Things That.

[0007]

In the present invention having such a structure, when the reheating is started by the reheating control means during the heat retention, the rice temperature in the rice cooking container is raised to the first temperature. Further, the reheating operation state is notified by the display. When the temperature detected by the temperature detecting means when the reheating operation is started is lower than the second temperature, the reheating operation is performed for a relatively long time, and when the detected temperature is equal to or higher than the second temperature, the reheating operation is performed. It ends in a relatively short time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, an annular frame 2 is attached to an opening edge portion of an upper end of a bottomed tubular rice cooker body case 1. Inside the main body case 1, a bottomed cylindrical inner frame 3 made of a metal material having excellent heat conduction such as aluminum.
The inner frame 3 integrally has a flange 4 at the opening edge at the upper end, and the flange 4 is locked to the inner peripheral edge portion of the annular frame 2.

The bottom of the inner frame 3 is formed of an insulating plate 5 made of a material having heat resistance and electrical insulation such as heat resistant glass, ceramics, or PPS resin. An induction coil 6 as a main heating source, which is composed of a litz wire or the like, is provided on the lower surface of the insulating plate 5, and the induction coil 6 has heat resistance FR-PET.
It is covered and supported by a coil cover 7 formed of resin or the like. A peripheral edge of the coil cover 7 extends substantially horizontally to the outer side of the inner frame 3, and the coil cover 7 forms an air passage 8 in a lower portion of the main body case 1.

On the lower surface of the coil cover 7, a ferrite rod 9 which is made of iron oxide as a main raw material and which is made of a material having a high magnetic permeability is attached by an adhesive to prevent leakage magnetic flux from the induction coil 6. It is like this.

A pot 10 which is a rice cooking container is detachably housed in the inner frame 3, and the pot 10 has a good thermal conductivity of 1.7 mm.
Use a thick aluminum layer and the outer surface of this aluminum layer clad with a magnetic metal material layer consisting of a 0.3 mm thick ferritic stainless steel layer, and use a fluorine resin coating on the inner surface of the pot to ensure non-adhesiveness. I am trying.

The opening at the upper end of the pot 10 expands in a tapered shape, and the tapered surface on the outer periphery of the opening contacts the opening edge at the upper end of the inner frame 3, and the contact causes the pot 10 to move to the inner frame 3. The space between the outer surface of the pot 10 and the inner surface of the inner frame 3 and the upper surface of the insulating plate 5 serves as an air layer 11. There is. It should be noted that the opening at the upper end of the pot 10 may have a shape that expands into a curved surface.

On the outer peripheral surface of the inner frame 3, the glass fiber core is made of Ni.
An electric heating type body heater 12 as an auxiliary heating source, in which a Cr heating wire or the like is wound and the outer periphery of which is electrically insulated with heat resistant silicone or the like, is wound and fixed by an adhesive material. The body heater 12 is wound around the inner frame 3 so that the heating density thereof gradually increases toward the lower part of the inner frame 3.
Further, a side surface temperature sensor 13 and a temperature fuse 14 including a thermistor and the like are attached to the upper portion of the outer peripheral surface of the inner frame 3.

A lid 16 is rotatably supported on the upper portion of the main body case 1 through a hinge shaft 15 so as to be vertically rotatable, and the lid 16 is lifted upward through a spring 17 mounted on the hinge shaft 15. Is elastically biased in the direction of rotation. A clamp mechanism 18 is provided on the front side upper portion of the main body case 1, and an edge portion of the lid body 16 on the free end side is detachably locked by the clamp mechanism 18, and the lid body 16 is locked by this locking. When the lid 16 is closed on the upper surface of the cooking main body case 1, the lid 16 is automatically rotated upward by the urging force of the spring 17 so that the upper surface of the main body case 1 is opened. ..

An inner surface plate 19 made of aluminum or the like is attached to the inner surface of the lid body 16.
An inner lid 21 is detachably attached to the lower surface side of the pot 9 via a stud 20, and the opening of the pot 10 is closed by the inner lid 21, and a plurality of small holes 22 are formed in the inner lid 21. A lid temperature sensor 23 including a thermistor and a lid heater 24 having the same structure as that of the body heater 12 are attached to the upper surface of the inner surface plate 19. Further, the lid 16 has a packing 2 for sealing the opening of the pot 10.
5. A steam port 26 is provided to allow the steam to escape to the outside when the steam pressure in the pan 10 rises above a certain level.

A control circuit portion 27 including a circuit for applying AC power to the induction coil 6 is provided in the ventilation passage 8 formed in the lower portion of the main body case 1, and the ventilation passage 8 is also provided therein. 28a and cooling fan 28b on one end side of
Is provided. A plurality of intake ports 29 are formed at the bottom of the main body case 1 so as to face the cooling fan 28b, and an exhaust port 30 is formed at the opposite side thereof.

A cylindrical heat shield plate 31 made of a steel plate or the like is provided on the outer peripheral side of the inner frame 3, and a micro heat shield plate 31 is provided outside the heat shield plate 31 and inside the front side of the main body case 1. A control circuit unit 32 including a computer and the like is provided.

A concave portion 36 forming a handle is formed on the upper portion of the lid 16. Also, the rice cooker body case 1
An operation display panel 34 is provided below the clamp mechanism 18 at the upper part on the front side of the. 33
Is an operation display board, and 35 is a cord reel device for winding a power cord (not shown).

As shown in FIG. 3, on the operation display panel 34, a rice cooking switch 34a used for starting rice cooking, a heat retention / hot switch 34b used for starting heat retention and reheating, and a time setting are used. Clock switch 34c,
For turning off the switch 34d used for interrupting the operation, the switch 34e for advancing the timer used for setting the time when setting the timer, the switch 34f for returning the timer used for setting the time for setting the timer, and for starting the timer rice cooking. Along with the various switches of the timer rice cooker switch 34g used, a liquid crystal display 34h that displays the current time and the finished time in parallel, rice cooker L that informs rice cooker operation
ED (light emitting diode) 34i, heat retention / hot LED 34j that informs heat retention and reheating by lighting and blinking
Also, a timer LED 34k for notifying the timer operation is provided.

FIG. 4 is a circuit diagram showing that the AC power supply 41 is connected to the primary winding of the power supply transformer 42, the heater control circuit 43, the heating device control circuit 44 and the motor control circuit 45 through the temperature fuse 14. ing. A constant voltage circuit 46 is connected to the secondary winding of the power transformer 42. The constant voltage circuit 46 produces a DC voltage of +5 V and supplies it to the microcomputer 47.

The heater control circuit 43 is composed of a triac (trade name) or the like, and the body heater 1 is connected to the output terminal thereof.
2 and the lid heater 24 are connected in parallel, and each heater 1
2, 24 are controlled to be turned on and off. The heating device control circuit 44 controls on / off of the induction heating device 45. The motor control circuit 45 controls the rotation of the motor 28a.

The induction heating device 45 is internally provided with an output control circuit 45a composed of an inverter circuit. When the induction heating device 45 is ON-controlled by the heating device control circuit 44, a high frequency current is supplied from the output control circuit 45a to the induction coil 6. It is like this.

The microcomputer 47 is a CPU,
An operation which is composed of a ROM, a RAM, various input / output ports and the like, takes in detection signals from the side surface temperature sensor 13 and the lid temperature sensor 23 to an A / D conversion input port, and is input from an operation switch 48 via an input circuit 49. A signal is taken in the input port and display data is output from the output port to the display circuit 51 via the output circuit 50. The operation switch 48 and the display circuit 51 are provided on the operation display panel 34.

The microcomputer 47 is also adapted to control the clock circuit 52 and the memory 53, which perform a clock operation. The microcomputer 47 also controls the heater control circuit 43 via a drive circuit 54, and the heating device control circuit 44 via a drive circuit 55.
The motor control circuit 4 via the drive circuit 56.
5 is controlled. Reference numeral 57 is a power supply backup circuit at the time of power failure. For example, the induction coil 6
Is 1200 W at 100% output, and the body heater 12
Is 60 W and the lid heater 24 is 23 W. The microcomputer 47 is set to perform the program control shown in FIGS.

That is, when a predetermined amount of rice and water are stored in the pan 10 and the rice cooking operation is started, first the hot water cooking operation is started. In this hot water cooker, when the pot is put in or taken out, it waits for 1 minute to obtain a stable initial state, and then controls the heating device control circuit 44 and the heater control circuit 43 for 3 minutes to induce the induction coil 6, the body heater 12 And the lid heater 24 is turned on. After 3 minutes, induction coil 6,
The body heater 12 and the lid heater 24 are turned off, and this state is waited for 5 minutes. Then, the maximum detected temperature a detected by the side surface temperature sensor 13 in the meantime is set.

Next, the rice cooking capacity is determined. In this capacity determination, from the relationship between the detected temperature b of the side surface temperature sensor 13 after 5 minutes and the maximum detected temperature a set, if b ≧ a + 2 ° C., a small amount determination is performed, and a + 2 ° C.> b ≧ a−2 If the temperature is ° C, the medium amount is determined, and if b <a-2 ° C, the large amount is determined.

Then, the amount of induction heating by the induction coil 6 and the ON / OFF control of the body heater 12 and the lid heater 24 are determined based on the determined rice cooking capacity. For example, when the amount is large, the induction heating amount is 50%, and the body heater 12 and the lid heater 24 are turned on.
To When the amount is medium, the induction heating amount is 30%, and the body heater 12 and the lid heater 24 are turned on. When the amount is smaller, the induction coil 6 is turned off, and the body heater 12 and the lid heater 24 are also turned off.

Wait for 6 minutes to elapse in this state. When 6 minutes have passed, the hot water cooking operation is terminated and rice cooking is started. During rice cooking, the rice cooking LED 34i is turned on, and the induction heating amount by the induction coil 6 and ON / OFF control of the body heater 12 and the lid heater 24 are determined based on the determined rice cooking capacity. For example, when the amount is large, the induction heating amount is 100
%, The body heater 12 and the lid heater 24 are turned on. When the amount is medium, the induction heating amount is 70%, and the body heater 12 and the lid heater 24 are turned on. When the amount is smaller, the induction heating amount is set to 50% and the body heater 12 and the lid heater 24 are turned off.
Set to FF.

In this state, the side surface temperature sensor 13 waits until it detects a temperature of c ° C. or higher, for example 90 ° C. or higher. When the side surface temperature sensor 13 detects 90 ° C. or higher, the induction heating amount is set to 100%. Also, the body heater 12 and the lid heater 24
Turns on.

In this state, it is judged that the rate of increase in the temperature detected by the side surface temperature sensor 13 decreases to 5 ° C. or less / 120 seconds,
When the temperature drops to 5 ° C. or lower / 120 seconds, the boiling detection ends, and the temperature d detected by the side surface temperature sensor 13 and the temperature e detected by the lid temperature sensor 23 at that time are set. Then, the amount of induction heating by the induction coil 6 and the ON / OFF control of the body heater 12 and the lid heater 24 are determined based on the determined cooked rice capacity. For example, when the amount is large or medium, the induction heating amount is 50%, and the body heater 12 and the lid heater 24 are turned on. When the amount is small, the induction heating amount is 30%, the body heater 12 and the lid heater 2
Turn on 4.

In this state, the lid temperature sensor 23 detects the temperature f = e.
When + 5 ° C. is detected, the induction heating amount is 30% and the body heater 12 and the lid heater 24 are turned on regardless of the determination cooking capacity. Then, it is determined that the rate of increase in the temperature detected by the lid temperature sensor 23 falls under the condition g, that is, 5 ° C. or lower / 100 seconds, and when the temperature rises to 5 ° C. or lower / 100 seconds, the induction coil 6 is turned off.
Set to FF.

When the side surface temperature sensor 13 detects the temperature h = d + 5 ° C. within 2 minutes thereafter, the rice cooking operation is terminated and the wiping operation is started. If the temperature h = d + 5 ° C. is not detected, the induction heating amount is set to 30% again to raise the temperature, and when the side surface temperature sensor 13 detects the temperature h, the rice cooking operation is ended and the wiping operation is started.

In the purging operation, the body heater 12 and the lid heater 24 are kept continuously turned on for the first 2 minutes, and after 2 minutes, the body heater 12 and the lid heater 24 are turned off for 60 seconds and turned on for 30 seconds. Switch to operation. When 13 minutes have passed after the start of the purging operation, the purging operation is ended and the heat retaining operation is started.

In the heat retaining operation, when 20 minutes have elapsed after the start of the stripping operation, the body heater 12 and the lid heater 24 are turned on when the temperature detected by the side surface temperature sensor 13 becomes 73 ° C. or lower,
When the temperature exceeds 73 ° C, it is turned off.

The control performed by the microcomputer 47 is shown in FIG. 8 by a temperature change graph and heater on / off timing. In addition, a solid line graph (a) in the figure shows a change in temperature detected by the side surface temperature sensor 13,
The one-dot chain line graph (b) shows the temperature change of the lid temperature sensor 23, and the dotted line graph (c) shows the temperature change of the pot bottom. 8A shows the timing of the induction coil 6, FIG. 8B shows the timing of the body heater 12, and FIG. 8C shows the timing of the lid heater 24.

Further, the microcomputer 47 is programmed so as to perform the control shown in FIG. 9 when the heat retention / hot switch 34b is operated when the off switch 34d is operated to be in the off state. That is, the warming operation is started in the first operation, the hot heating which is the reheating operation is started in the second operation, and the warming operation is started again in the third operation. That is, the heat retention / hot switch 34b is adapted to alternately start the heat retention operation and the hot heating operation by its operation.

The microcomputer 47 is programmed so as to perform the control shown in FIG. 10 during the heat retaining operation. That is, during the heat retention control, the heat retention / hot LED 34j is turned on. When the heat retention / hot switch 34b is operated in this state, the heat retention / hot LED 34j is switched from lighting to blinking. Then, the temperature T detected by the side surface temperature sensor 13 is checked. When the temperature T detected is lower than 85 ° C., the induction coil 6 is turned on, and the body heater 12 and the lid heater 24 are also turned on. Further, "10 minutes" is displayed on the completion time display portion of the liquid crystal display 34h.

In this state, wait until the temperature T detected by the side surface temperature sensor 13 exceeds 90 ° C., and when it exceeds 90 ° C., the induction coil 6 is turned off. Further, the body heater 12 and the lid heater 24 are controlled to be OFF at 90 ° C. or higher and ON at less than 90 ° C. Then, 10 minutes after 90 ° C. is detected, the hot heating operation is terminated and the normal heat retention control is performed.

The temperature T detected by the side surface temperature sensor 13
When the temperature is 85 ° C. or higher, “1 minute” is displayed on the completion time display portion of the liquid crystal display 34h. Then, it is checked whether the temperature T detected by the side surface temperature sensor 13 is 90 ° C. or higher, and if it is 90 ° C. or higher, the process waits for 1 minute to elapse. If the temperature is lower than 90 ° C., the body heater 12 and the lid heater 24 are turned off at 90 ° C. or higher, and if the temperature is lower than 90 ° C.
Control with N. Then wait for 1 minute. 90
When one minute elapses after the temperature is detected, the hot heating operation is terminated and the normal heat retention control is performed.

In the embodiment having such a structure, for example, a large amount is determined by the capacity determination in the hot water cooking, and when the rice cooking operation is started in this state, the induction heating operation is performed by the induction coil 6 with an induction heating amount of 100%. Is started. Further, the body heater 12 and the lid heater 24 are also turned on.

When a high frequency current is supplied from the output control circuit 45a of the induction heating device 45 to the induction coil 6, an alternating magnetic field is generated and an eddy current is generated at the bottom of the pan 10. And the Joule heat by the eddy current causes the magnetic metal part of the pan 10 to mainly generate heat,
Heat is transferred to the entire pot by heat conduction by the aluminum layer, heating the rice and water inside. The metal part of the inner frame 3 is heated by the body heater 12, and the inner surface plate 19 of the lid 16 is heated by the lid heater 24. One of the heat generated in the metal part of the inner frame 3 becomes radiant heat and is transferred to the pan 10 through the space, and the other becomes conductive heat and the opening edge at the upper end of the inner frame 3 and the upper end opening part of the pan 10. Pan 1 through the contact with the taper surface
It is transmitted to 0. In this way, the heat generated in the metal portion of the inner frame 3 is efficiently transferred to the pan 10.

Thus, the temperature in the pot 10 gradually rises,
When the side surface temperature sensor 13 detects 90 ° C. or higher, the induction heating operation is continuously performed with the induction heating amount of 100%, and the body heater 12 and the lid heater 24 are continuously turned on. Eventually, the inside of the pot 10 will be in a boiling state and the rate of temperature increase will decrease. In this state, when the temperature rise rate of the temperature detected by the side surface temperature sensor 13 decreases to 5 ° C. or lower / 120 seconds, the boiling detection ends. Then, the detected temperature d of the side surface temperature sensor 13 and the detected temperature e of the lid temperature sensor 23 at this time are set.

When the boiling detection is completed, the induction heating amount is set to 50.
%. Further, when the boiling continues, the amount of water vapor generated decreases and the amount of water droplets attached to the inner lid 21 and the inner surface plate 19 decreases. And lid temperature sensor 2
When the detected temperature of 3 reaches f = e + 5 ° C., the induction heating amount is further reduced to 30%. In this state, the lid temperature sensor 2
When the rate of temperature rise due to the detected temperature of 3 falls below 5 ° C./100 seconds or less, energization to the induction coil 6 is stopped and induction heating is stopped.

Further, as the water content in the pot 10 disappears, the side temperature of the pot 10 also rises. Then, when the temperature detected by the side surface temperature sensor 13 reaches h = d + 5 ° C., the rice cooking is finished and the process shifts to the unevenness. At this time, if the temperature detected by the side surface temperature sensor 13 does not reach h = d + 5 ° C. even after 2 minutes have elapsed, it is determined that a relatively large amount of water remains in the pan 10 and induction is performed again with an induction heating amount of 30%. Energization of the coil 6 is started to evaporate the water in the pan 10.

In the purging operation, the body heater 1 is used for the first 2 minutes.
2 and the lid heater 24 are continuously turned on, then turned off for 60 seconds and turned on intermittently for 30 seconds. In this unevenness, the dew on the inner surface of the lid is prevented, and the temperature drop in the outer space of the pan is prevented by heating to a degree that does not cause kogation in the rice.
Keep the temperature high so that the rice is sufficiently gelatinized. When 13 minutes have passed from the start of the purging, the purging operation is terminated and the heat retaining operation is started. Keeping warm when shifting to warming operation /
The hot LED 34j lights up to inform that the temperature is being kept warm.

The temperature of the pan 10 does not drop sharply even if the heat-insulating operation is started, but it gradually drops. Therefore, the user may operate the heat retention / hot switch 34b while the temperature T detected by the side surface temperature sensor 13 is still 85 ° C. or higher. Heat insulation / hot LED even in such a case
34j switches to blinking and notifies that the heating operation has been started. The completion time "1 minute" is also displayed on the liquid crystal display 34h.

Thus, the user knows that the hot heating operation has been started by operating the heat retention / hot switch 34b, confirms the completion time, and waits for 1 minute. In this way, even when the heat retention / hot switch 34b is operated with the rice temperature being high, the hot heating operation is always started, so that the user does not mistakenly think that it is a malfunction as in the conventional case. Moreover, since the waiting time is as short as 1 minute, the user can know that the rice temperature is high, and can immediately taste the warm rice.

Further, the heat retaining operation is continued for a long time, and the rice temperature is increased to 73
When the heat retention / hot switch 34b is operated in the state of being kept at around 0 ° C., the induction coil 6 is turned on, and the body heater 12 and the lid heater 24 are also turned on. In this way, the pot 10 is heated and the temperature of the rice in the pot rises. The liquid crystal display 34h displays "10
Minutes ”is displayed.

After that, when the temperature T detected by the side surface temperature sensor 13 exceeds 90 ° C., the induction coil 6 is turned off, and the body heater 12 and the lid heater 24 are controlled by OFF ≧ 90 ° C.> ON. Then, after 10 minutes have passed, the hot heating operation is ended and the normal heat retention control is started.

In this way, the user knows that the hot heating operation has been started by operating the heat retention / hot switch 34b, confirms the completion time, and waits for 10 minutes. In this way, when the warm / hot switch 34b is operated with the rice temperature being low, 10 minutes is displayed as the completion time, and the user can recognize this.

Further, since the heat retaining state and the reheating state of hot heating are informed by lighting and blinking one LED 34j, the number of LEDs used can be reduced. Further, since the switch for starting hot heating also serves as the switch for starting warming operation, the warming operation and hot heating can be started alternately, so that the number of switches used can be reduced. Since the number of LEDs and the number of switches can be reduced in this way, the operation display panel 34 can be downsized. Moreover, since the switching from the hot heating to the heat retention operation can be performed by operating the heat retention / hot switch 34j without using the off switch,
It is easy to operate and there is no risk of accidentally leaving it in the cut state.

Further, since the concave portion 36 is formed on the upper portion of the lid body 16 to form a handle, the handle is not protruded above the lid body, and the design is excellent. Further, it can be used not only for carrying but also as a handle when the lid 16 is opened, which is extremely convenient.

[0054]

As described above in detail, according to the present invention, when the reheating operation is performed while the temperature is kept warm, the reheating operation can be notified irrespective of the temperature state, and therefore, the user misunderstands that it is a failure. There is no fear, and when the reheating is started in a state where the rice temperature is high, by shortening the reheating time, it is possible to provide the rice cooker that can quickly supply the user with the high temperature rice.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rice cooker showing an embodiment of the present invention.

FIG. 2 is an external view of the rice cooker of the embodiment.

FIG. 3 is a diagram showing a configuration of an operation display panel of the same embodiment.

FIG. 4 is a circuit block diagram of the same embodiment.

FIG. 5 is a flowchart showing control by the microcomputer of the embodiment.

FIG. 6 is a flowchart showing control by the microcomputer of the embodiment.

FIG. 7 is a flowchart showing control by the microcomputer of the embodiment.

FIG. 8 is a graph showing changes in the detection temperature and pan bottom temperature of each sensor and the operation timing of the induction coil and each heater in the same embodiment.

FIG. 9: Insulation by the microcomputer of the same embodiment /
The flowchart which shows a hot switch control.

FIG. 10 is a flowchart showing hot heating control by the microcomputer of the embodiment.

FIG. 11 is a graph for explaining conventional heat retention and reheating control.

[Explanation of symbols]

1 ... rice cooker body case, 6 ... induction coil, 10 ... pan, 1
2 ... Body heater, 13 ... Side temperature sensor, 24 ... Lid heater, 34b ... Heat retention / hot switch, 34h ... Liquid crystal display, 47 ... Microcomputer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Meguro 2570 Gosuda 1, Kamo City, Niigata Prefecture 1570 Toshiba Home Techno Co., Ltd. (72) Inventor Koji Tsurumaki 2570 1 Gosuda, Kamo City, Niigata Prefecture Toshiba Home Techno Incorporated (72) Inventor Nobuhide Horiuchi 4-21, Yoshihara-cho, Nishi-ku, Nagoya-shi, Aichi Toshiba Corporation Nagoya factory

Claims (1)

[Claims] 1. A jar rice cooker that heats a rice cooking container to perform a rice cooking operation and controls the temperature of the rice cooking container after the rice is cooked, the temperature detecting means detecting a temperature of the rice cooking container, and the rice cooking container being kept warm. Reheating control means for reheating the rice temperature inside to a first temperature lower than the boiling temperature based on the temperature detected by the temperature detection means, and detection of the temperature detection means at the start of reheating by the reheating control means A judgment means for judging whether or not the temperature is equal to or higher than a second temperature lower than the first temperature, and a reheating operation time by the reheating control means when the detected temperature is equal to or higher than the second temperature by the judgment means. Reheating operation time setting means for setting a relatively short reheating operation time by the reheating control means when the temperature is lower than the second temperature and display means for displaying the reheating operation state are provided. A jar rice cooker characterized by that.