JPS63127718A - Rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rice cooker used for general household or commercial purposes and for cooking rice and the like.

2. Description of the Related Art Conventional rice cookers of this type include, for example, Japanese Patent Application Laid-Open No. 58
As shown in Publication No. 4616 and Japanese Patent Application Laid-Open No. 61-41909, in order to eliminate uneven temperature distribution in the pot and cook rice fluffy and deliciously, the heater is installed not only at the bottom of the pot, but also at the bottom of the pot. The sides and top were also equipped so that it could be heated from all around.

Problems to be Solved by the Invention However, in such a conventional configuration, the optimum amount of rice to be cooked is determined by the position of the side and top heaters and the heat balance with the bottom heater. ,
Even if the amount of rice cooked was more or less than this optimum amount, the temperature distribution in the pot still remained uneven. Additionally, if the configuration of the main body or the shape of the pot changed, the position of each heater and the balance of heat amount had to be changed. Furthermore, since the heaters are installed on the side and top surfaces, the structure of the mounting parts and insulation is complicated, and the wiring is also complicated.As a result, material costs and assembly man-hours also increase. Prices were getting higher.

The present invention solves these problems by notifying the user that the temperature distribution inside the pot is uneven and by stirring the rice, etc. in the pot. The purpose of the present invention is to provide a rice cooker that can cook rice quickly and deliciously without having to use it.

Means for Solving the Problems In order to solve the above problems, the rice cooker of the present invention includes a temperature sensor that directly or indirectly detects the temperature of the rice, water, etc. in the pot, and a temperature sensor that detects the temperature of the rice, water, etc. in the pot. This device includes a temperature determining means for determining whether the temperature is within the range, and a display/notifying means for displaying or notifying based on the output of the temperature determining means.

Function According to the above configuration, it is possible to notify the user that the temperature distribution inside the pot is uneven, and by stirring the rice, etc. in the pot, the unevenness in the temperature distribution inside the pot can be eliminated.
After that, the water in the pot is brought to a boil, and by eliminating uneven temperature distribution in the pot during the boiling state, the rice can be cooked fluffy and delicious.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a circuit diagram of a rice cooker according to an embodiment of the present invention, and FIG. 2 shows an explanatory diagram of the circuit operation of the same rice cooker. In the figure, 1 is an AC power source, and 2 is a heater, which is provided to heat the outer bottom of a pot (not shown). 3 is a relay contact, and the heater 2 is connected to the AC power source 1 via this relay contact 3. 4 is a negative characteristic thermistor, which is installed at the center of the outer bottom of the pot, and has a resistance of 5.
is connected in series with the converter to convert temperature changes into voltage changes. 6 is a temperature discrimination circuit, and this temperature discrimination circuit 6 includes comparators 61 and 62 having open collector outputs and a resistor 63.
, 64, 65, and 66, the divided voltage v1 of the thermistor 4 and the resistor 5 is input to one input terminal of the comparator 61 and the manual input terminal of the comparator 62, respectively, and the voltage divided by the resistors 83, 64, and 66 Voltage v2. v3 is input to the manual input terminal of the comparator 61 and one input terminal of the comparator 62, respectively. The outputs of the comparators 61 and 62 are connected to a pull-up resistor 66. Reference numeral 7 denotes a light emitting diode (hereinafter referred to as LED), to which the output of the temperature discrimination circuit 6 is transmitted via a transistor 8.

9 is a comparator with an open collector output, and one input terminal of this comparator 9 is connected to a thermistor 4 and a resistor 5.
A divided voltage v1 is input to the manual input terminal, and a resistor 1 is input to the manual input terminal.
A divided voltage v4 of 0.11 is inputted, and one input terminal of the comparator 9 is connected to a diode 12. Resistor 13 is input.

14 is a comparator with an open collector output, a voltage divided by resistors 15 and 16 is input to the manual input terminal of this comparator 14, and a resistor 1 is input to the - input terminal.
The voltage divided by 7.18 is input, and the - input terminal is connected to the output terminal of the comparator 9.

Reference numeral 19 denotes a relay coil, and a current is passed through the relay coil 19 via the transistor 2o based on the output of the comparator 14 to open and close the relay contact 3. A rice cooking switch 21 is connected in parallel to the output terminal of the comparator 9. Reference numeral 22 denotes a DC power supply for operating the above-described circuit, and is composed of a transformer 22a, a rectifier diode 22b, a capacitor 22C, a resistor 22d, and a Zener diode 22e.

Next, the operation of the above configuration will be explained. First, when the rice cooking switch 21 is turned on, the resistor 6 is connected to the resistor 1.
3 and diode 12 are connected in parallel, the divided voltage v1
decreases, comparator e1.62, et7)
The output is inverted, OFF and ON respectively.

At the same time, one input terminal of the comparator 14 becomes Ov, so the output is inverted and turned OFF. As a result, transistor 2o is turned on, current flows through relay coil 19, closes relay contact 3, and current flows through heater 2. By heating the heater 2, the temperature of the pot rises, and the temperature of the thermistor 4 also rises. 70℃
, the output of the comparator 62 is inverted and turned OFF.
Since it is set so that the temperature exceeds 70℃, the L
ED7 lights up. Further, when the temperature reaches 80° C., the output of the comparator 61 is inverted and turned ON, so when the temperature exceeds 80° C., the LED 7 turns off. and,
When the water in the pot is further heated and the water in the pot boils and evaporates, and the bottom temperature of the pot exceeds 134°C, the output of comparator 9 is reversed and turned OFF, so the output of comparator 14 is also reversed and turned ON. , transistor 20 is OFF
F, and no current flows through the relay coil 19, so the relay contact 3 opens, stopping the power supply to the heater 2, and completing the rice cooking.

In the above embodiment, an LED was used, but a lamp or a buzzer may be used, and the lighting and ringing may be continuous or intermittent.
It may be indicated by blinking in combination with ED or the like.

Effects of the Invention As described above, according to the present invention, the temperature distribution of the water in the pot before it boils is between about 70 and 80 degrees Celsius, and the user is informed by display or notification. Stir the rice, etc. in the pot to even out the uneven temperature distribution in the pot.
Since the water in the pot is brought to a boil, it is possible to eliminate unevenness in the temperature distribution in the pot during boiling, and as a result, the rice can be cooked fluffy and delicious.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a rice cooker showing one embodiment of the present invention;
The figure is an explanatory diagram of the circuit operation of the rice cooker. 2...Heater, 4...Thermistor (temperature sensor), 6...Temperature discrimination circuit, 7...
...Light emitting diode (display notification means).

Claims (1)

[Claims] A cylindrical pot with a bottom, a heater that heats rice, water, etc. stored in the pot, a temperature sensor that directly or indirectly detects the temperature of the rice, water, etc., and this temperature sensor detects a temperature within a predetermined temperature range. 1. A rice cooker comprising a temperature determining means for determining whether the temperature is at a certain temperature, and a display/notifying means for displaying or notifying based on the output of the temperature determining means.