JPH05293032A - Rice cooking jar - Google Patents

Abstract

PURPOSE:To display the temperature in the rice bowl at warm keeping time with digital indication, and raise the temperature in the rice bowl higher than the warm-keeping temperature by a reheat conroller at warm keeping time, by making use of a time indicator. CONSTITUTION:The temperature in the rice cooker is shown like Hi, Lo together with the present time on an indicator 51 in accordance with the value of detected temperature of a bowl-temperature sensor 11 at warm keeping time. Since the indicator 51 indicating the time is originally utilized, it is not necessary to provide separately an indicator like a lamp and hence, the constitution of an indicator 40 becomes simple. When a reheating switch 37a on the operating disk 37 is operated at warm keeping time, a rice-cooking heater 5 preset by a timer circuit 45 strats reheating for 10 minutes in accordance with the detected temperature of the bowl-temperature sensor 11. In this time, the present time and the residual time 10 minutes for reheating are shown in the indicator 51. When the detected temperature of the bowl-temperature sensor 11 gets as higher as 120 deg.C within this 10min., a rice-cooking heater 5 is turned off and the reheating action is stopped. In this way, scorching of rice is prevented.

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 capable of keeping warm.

[0002]

2. Description of the Related Art Conventionally, in this type of rice cooker, the temperature inside the pan is kept at about 73 ° C. when the temperature is kept warm, and the heat-retained state is maintained by LED
A display using a (light emitting diode) lamp is known. In addition, since the temperature inside the pan is high immediately after the rice is cooked even during heat retention, it is known to display this with an LED lamp different from the LED lamp that indicates normal heat retention in order to distinguish this from the normal heat retention state. ..

[0003]

However, it is difficult for the viewer to confirm the difference between the temperature states during heat retention by simply displaying the lamps as described above, and there is a risk of erroneously confirming the normal heat retention state and the high temperature heat retention state. was there. There is also a problem that the number of lamps in the display section increases. Moreover, it was not possible to achieve the taste of rice at a temperature higher than the heat retention temperature during heat retention.

Therefore, the present invention intends to provide a jar rice cooker capable of surely knowing the temperature inside the pot during heat retention, reducing the number of lamps, and increasing the temperature inside the pot during heat retention. It is what

[0005]

According to the present invention, a pan is heated by a rice cooking heater to perform a rice cooking operation, and after completion of the rice cooking operation, a temperature inside the pan is detected by a sensor by a heat retaining heater and the rice is kept at a predetermined heat retaining temperature. In the jar rice cooker, a display for displaying the temperature inside the pot during warming is displayed with letters or numbers, and a reheating control means that drives the rice cooker heater during warming to raise the temperature inside the pot to a temperature higher than the warming temperature. It is a thing.

[0006]

In the present invention having such a structure, the temperature inside the pot during heat retention is displayed by letters or numbers. Further, at the time of heat retention, the rice heating heater is driven by the reheating control means to raise the temperature inside the pan to a temperature higher than the heat retention temperature.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a bowl body, which is composed of an outer case 3 and an inner case 4 connected by an upper frame 2, and an inner bottom of the inner case 4 has a rice cooking heater 5 Is provided, and the heat retention heater 6 is provided on the side portion.

Reference numeral 7 denotes a rice cooker housed in the inner case 4 so that it can be inserted into and removed from the inner case 4, and a cup-shaped heat-sensitive portion 8 is provided in the inner case 4 so as to be elastically pressed against the outer bottom portion of the pan 7. ing. The pot 7 contains rice 9 and water 10. A pot temperature sensor 11 for detecting the pot temperature is provided inside the heat-sensitive section 8.
Are enclosed by a mold member 12 having heat conductivity.

Reference numeral 13 denotes an outer lid pivotally provided to open and close the upper opening of the vessel body 1. The outer lid 13 has a hollow structure and is provided with a steam outlet portion 14. A heat retention heater 6 is arranged in the hollow portion.

Reference numeral 15 is a cylindrical stud provided at the center of the lower surface of the outer lid 13, and the stud 15 has a bush 1
An inner lid 17 is suspended via 6 and a packing 18 is provided on the outer peripheral edge of the inner lid 17 so that the upper opening of the pot 7 can be elastically closed.

The inner lid 17 is elastically pressed against the upper opening of the pot 7 through a bush 16 made of an elastic material such as silicon rubber, and is kept sealed by a packing 18. When the steam pressure becomes too high, the inner lid 17 is pushed up against the pressing force of the bush 16 by the steam pressure, and the steam is discharged from the gap between the inner lid 17 and the pan 7. In this case, a stainless steel spring or the like may be used instead of the bush 16.

Reference numeral 19 denotes a cup-shaped heat-sensing portion provided at the lower end of the stud 15 so as to face the inside of the pot 7. Inside the heat-sensing portion 19, an air temperature sensor 20 for detecting the temperature of air in the pot 7 is transmitted. It is enclosed by a heat-resistant mold member 21.

Reference numeral 22 is an electronic circuit unit provided at the bottom of the bowl body 1, which controls the input of the rice cooking heater 5 and the warming heater 6 based on the temperature detection information of the pan temperature sensor 11 and the air temperature sensor 20. I am supposed to do it.

FIG. 2 shows a circuit housed in the electronic circuit unit 22. A constant voltage circuit 33 is connected to a commercial AC power source 31 via a power transformer 32, and the output terminal of the constant voltage circuit 33 is controlled. The part 34 is connected.

The rice cooking heater 5 is connected to the power source 31 via a normally open contact 35a of a relay 35.
The heat retaining heater 6 is connected in parallel to the normally open contact 35a of the relay 35 via a bidirectional three-terminal thyristor 36.

The pan temperature sensor 11, the air temperature sensor 20 and the operating unit 37 are connected to the input terminal of the control unit 34, and the coil 35c of the relay 35 is connected to the output terminal.
A relay drive circuit 38 for controlling energization to the thyristor, a thyristor drive circuit 39 for driving and controlling the thyristor 36, a display unit 40 and a buzzer 41 are connected. The relay drive circuit 37 and the thyristor drive circuit 38 form a heater drive circuit. A battery 42 for backing up a power failure is also connected to the control unit 34.

As shown in FIG. 3, the control unit 34 includes a CPU (central processing unit) 43, which constitutes the main body of the control unit, and a C
Memory 44 and timer circuit 4 controlled by PU 43
5, an input circuit 46, an output circuit 47, a backup circuit 48, and an A / D converter 49 are provided.

The input circuit 46 directly inputs a signal from the operating section 37 and also outputs the temperature sensors 11 and 2.
The detection signal from 0 is input through the A / D converter 49. The output circuit 47 is the relay drive circuit 38.
And a heater drive unit 50 including a thyristor drive circuit 39
A control signal to the display unit 40 including a segment display unit 51 capable of displaying two types of time and a display drive unit 52 for driving the display unit 51, and to the buzzer 41. It is designed to output a drive signal. When the backup circuit 48 detects a power failure, the backup circuit 48 supplies the power of the battery 42 to the CPU 43.
It is designed to be supplied to. The operation section 37 is provided with a reheating switch 37a that constitutes reheating setting means in addition to a start switch for starting rice cooking, a timer setting switch, and the like.

The CPU 43 puts a predetermined amount of rice 9 in the rice cooking pot 7.
When the water 10 is stored and the start switch is turned on, the relay drive circuit 38 is controlled to drive the relay 35 to turn on the rice cooking heater 5. In this state, wait for the temperature T1 detected by the air temperature sensor 20 to reach T1 ≥90 ° C.
When 1 ≥ 90 ° C, boiling detection is performed, and heating amount control during boiling is further performed. Then, when the pan temperature sensor 11 detects a predetermined cooking temperature, for example, 120 ° C. or higher, it is determined that the cooking is finished and the rice cooking operation is finished. Then, when the temperature T2 detected by the pan temperature sensor 11 becomes T2 ≧ 120 ° C., the cooking detection is completed, the rice cooking heater 5 is turned off, and the next wiping operation is performed. This purging operation is performed, for example, for about 13 minutes, and when the purging operation is completed, the warming operation by the warming heater 6 is started.

The CPU 43 is adapted to perform the display control shown in FIG. 4 during heat retention and during a power failure during the heat retention operation. That is, the temperature T2 detected by the pan temperature sensor 11 is
When T2 ≧ 85 ° C., the display unit 51 is caused to display the present time and the temperature state inside the rice cooking pot 7 by “HI”. 85 ° C>
When T2 ≧ 65 ° C., the display unit 51 displays the current time and the temperature state in the rice cooking pot 7 by “HOT”. Also T2 <
At 65 ° C., the display 51 displays the current time and the temperature state inside the rice cooking pot 7 as “Lo”.

Further, the CPU 43 performs the display control shown in FIG. 5 immediately after the reheating switch 37a of the operating portion 37 is operated while the temperature is kept warm. That is, the temperature T2 detected by the pan temperature sensor 11 is T
At 2 ≧ 85 ° C, display 51 shows the current time and rice cooker 7
The internal temperature state is displayed by "HI". 85 ° C> T
At 2 ≧ 65 ° C., the display unit 51 displays the present time and the remaining reheating time “10” minutes. Also, at T2 <65 ° C, the display unit 51 displays the current time and the reheating remaining time "15".
Display the minutes.

When the reheating operation is started, as shown in FIG. 7, the temperature T2 detected by the pan temperature sensor 11 becomes T2 ≥
When the temperature is 85 ° C., the buzzer 41 is operated to notify that the reheating operation is invalid because the temperature inside the rice cooking pot 7 is sufficiently high. When 85 ° C.> T2 ≧ 65 ° C., the reheating time is set to 10 minutes by the timer circuit 45, and the relay driving circuit 38 is controlled to drive the relay 35 to turn on the rice cooking heater 5. When the temperature T2 detected by the pan temperature sensor 11 becomes T2 ≧ 120 ° C., the rice cooking heater 5 is turned off.
Let However, regarding the display of the display unit 51, the display for the present time and the reheating remaining time “10” is continued. When the timer circuit 45 counts 10 minutes in this state, the reheating operation is stopped and the display of the display unit 51 is returned to the display control during heat retention shown in FIG. When T2 <65 ° C, the reheating time is set to 15 minutes by the timer circuit 45, the relay drive circuit 38 is controlled to drive the relay 35, and the rice heating heater 5 is turned on.
Let And the temperature T2 detected by the pan temperature sensor 11 is T
When 2 ≧ 120 ° C, the rice cooking heater 5 is turned off. However, regarding the display of the display unit 51, the display for the current time and the remaining reheating time "15" is continued. When the timer circuit 45 counts 15 minutes in this state, the reheating operation is stopped and the display of the display 51 is returned to the display control during the heat retention shown in FIG.

The CPU 43 shown in FIG. 6 is used to check the segment of the display 51 when the power is turned on.
As shown in (a), all the segments of the display 51 are turned on for a certain period of time. When the rice cooking operation is set by the timer, the display 51 displays the current time and the rice cooking end time by the timer operation, as shown in FIG. 6B.

In this embodiment having such a structure, when a predetermined amount of rice 9 and water 10 are stored in the rice cooking pot 7 and the start switch is turned on, the rice cooking heater 5 is energized to start the rice cooking operation. Be started. Then, when the boiling temperature in the rice cooking pot 7 is detected by the air temperature sensor 20, and when the pan temperature sensor 11 detects a predetermined cooking temperature of 120 ° C. or higher, the cooking is completed and the rice cooking operation is completed. Then, the operation shifts to the purging operation. When the purging operation is performed for about 13 minutes, the warming operation is started.

During the warming operation, the temperature T2 detected by the pan temperature sensor 11 is T2.gtoreq.85.degree. C. When the temperature T2 is .gtoreq.85.degree. When 85 ° C> T2 ≧ 65 ° C, the display 5
The current time and the temperature state “HOT” in the rice cooking pot 7 are displayed in 1. Further, when T2 <65 ° C., the present time and the temperature state “Lo” in the rice cooking pot 7 are displayed on the display 51.

Therefore, the temperature condition in the pan 7 while the temperature is kept warm can be easily and surely confirmed by the character display. Further, since the display unit 51 that originally displays the time is used, it is not necessary to separately provide a display unit such as a lamp, and the configuration of the display unit is simplified.

When the reheating switch 37a of the operating portion 37 is operated during the heat retaining operation, the pan temperature sensor 11 at that time is operated.
When the detected temperature T2 of T.sub.2 is T2.gtoreq.85.degree. C., the temperature state "HI" is displayed on the display 51 along with the current time, and the buzzer is notified. With this, it is possible to inform that the temperature inside the pot is sufficiently high and reheating is unnecessary.

The temperature T2 detected by the pan temperature sensor 11 is
When 85 ° C.> T2 ≧ 65 ° C., the reheating time of 10 minutes is set by the timer circuit 45 and the rice heating heater 5 starts reheating. At this time, the display unit 51 displays the present time and the reheating remaining time of 10 minutes. Within this 10 minutes, the temperature T2 detected by the pan temperature sensor 11 becomes T2 ≧ 120
When the temperature reaches ℃, the rice cooking heater 5 is turned off and the reheating operation is stopped. This prevents the rice from burning. Then, after 10 minutes have passed, the display on the display unit 51 returns to the display state in which the temperature is maintained.

The temperature T2 detected by the pan temperature sensor 11 is
When T2 <65 ° C., the reheating time of 15 minutes is set by the timer circuit 45 and the rice cooking heater 5 starts reheating. Then, at this time, the present time and the reheating remaining time of 15 minutes are displayed on the display unit 51. Within 15 minutes, when the temperature T2 detected by the pan temperature sensor 11 becomes T2 ≧ 120 ° C., the rice cooking heater 5 is turned off and the reheating operation is stopped. This prevents the rice from burning. And 15
After a lapse of minutes, the display on the display unit 51 returns to the display state in which the temperature is kept warm. In this way, when it is desired to taste warmer rice while keeping warm, the temperature of the rice in the rice cooking pot 7 can be sufficiently raised by the reheating operation.

[0031]

As described in detail above, according to the present invention, it is possible to reliably know the temperature condition inside the pot during heat retention, and it is possible to reduce the number of lamps and increase the temperature inside the pot during heat retention. It is possible to provide a jar rice cooker that can.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a main part of the embodiment.

FIG. 3 is a block diagram showing a configuration of a control unit in the embodiment.

FIG. 4 is a flow chart showing display control during heat retention and during power failure during heat retention in the same embodiment.

FIG. 5 is a flowchart showing display control immediately after reheating in the embodiment.

FIG. 6 is a diagram showing a display state at the time of segment check and timer operation in the embodiment.

FIG. 7 is a flowchart showing reheat control in the same embodiment.

[Explanation of symbols]

5 ... rice cooking heater, 7 ... rice cooking pot, 11 ... pot temperature sensor, 3
4 ... Control unit, 37a ... Reheat switch, 43 ... CPU,
51 ... Indicator.

Claims (1)

[Claims] 1. A jar rice cooker in which a pan is heated by a rice cooker to perform a rice cook operation, and after the rice cook operation is completed, the temperature of the pan is detected by a sensor by a heat retention heater and the temperature is kept at a predetermined heat retention temperature. An indicator that displays the temperature state inside the pan with letters or numbers, and drives the rice heating heater when keeping warm,
A jar rice cooker comprising reheating control means for raising the temperature in the pan to a temperature higher than the heat retention temperature.