JPS6117489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rice cooker, and particularly aims to provide a rice cooker that always cooks delicious rice by adjusting the heat power after boiling.

It is generally said that in order to cook delicious rice, it is necessary to sufficiently promote the gelatinization of rice starch. To do this, the temperature of the rice must be kept at about 98℃ or higher.
It is known that it is good to maintain the temperature for 20 minutes or more.

However, in a conventional rice cooker, as shown in Fig. 1, a rice cooking end switch 1, a heating heater 2, and an AC power supply 3 are connected in series, and as shown in Fig. 2, the pot temperature rises to boiling temperature A. When the operating temperature B of the rice-cooking end switch 1 is reached, the temperature continues to rise and the rice-cooking end switch 1 is opened to cut off the power supply to the heater 2.
In this case, the time C from when the pot temperature reaches the boiling temperature A until the operating temperature B of the rice cooking end switch 1 is reached cannot be made long enough, and delicious rice cannot be cooked.

The present invention eliminates the drawbacks of the conventional rice cooker described above, and embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

First, the outline of this embodiment will be explained with reference to FIG. 3. 4 is a rice cooking container, 5 is a temperature detecting means composed of, for example, a thermistor, 6 is a timer, 7 is a heating amount adjusting means composed of, for example, a semiconductor switch,
8 is a heating means such as a heater.

Briefly explaining the operation below, when the temperature of the rice cooking container 4 reaches a predetermined temperature below the boiling point, the temperature detection means 5 detects this temperature, and the timer 6 operates based on the output of the temperature detection means 5. . After a certain period of time sufficient for the inside of the rice cooking container to reach a boiling state, the heating amount adjusting means 7 is activated by the output of the timer 6 to reduce the heating amount by the heating means 8.

Next, the specific configuration of this embodiment will be explained with reference to FIG. 4.

9 is an AC power source, and this AC power source 9 is equipped with a temperature switch 10 as a temperature detection means 5 for detecting a predetermined temperature below the boiling point, and a motor 11 of a timer 11.
A series circuit with the first heater 12 and the second heater 13 is connected in parallel to this series circuit. Further, a contact point 11b of the timer 11 is connected to the second heater 13 in parallel.

In the above configuration, when the rice cooking container temperature is low after starting rice cooking, the temperature switch 10 is opened and the contact 11b of the timer 11 is closed, and the power supply voltage is applied only to the first heater 12 and rice is cooked with high power. will be held. After this, when the temperature of the rice cooking container rises and reaches a predetermined temperature below the boiling point, the temperature switch 10 is turned on.
is closed, the power supply voltage is applied to the motor 11a of the timer 11, and the motor 11a is driven, that is, the timer 11 starts timing. After a predetermined time period sufficient for the inside of the rice cooking container to reach a boiling state from the start of timing by the motor 11a, that is, when the timing by the timer 11 ends, the contact point 11 of the timer 11 is closed.
b is opened, and the first heater 12 and the second heater 1
A power supply voltage is applied to the series circuit with 3, and low power heating is performed. At this time, the inside of the rice cooking container has already reached a boiling state, and heating with low power by the first heater 12 and the second heater 13 causes the rice to reach a boiling state, at a time C shown in FIG. , is maintained for a long time, and the gelatinization of the rice is promoted. After that, a rice cooking end switch (not shown) is opened and the first heater 12 and second heater 13 are opened.
Power is cut off and cooking ends.

As is clear from the above description, according to the present invention, the timer is activated after the rice cooker reaches a predetermined temperature below the boiling point, and after a certain period of time has elapsed, the heat is weakened to ensure that the rice is boiling within the time period measured by the timer. After reaching this state, the amount of heating is reduced, and the boiling time is maintained for a long time, so the gelatinization of rice can be sufficiently promoted, and delicious rice can be cooked.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of a conventional rice cooker, Fig. 2 is a time characteristic diagram of pot temperature of the rice cooker, Fig. 3 is a system block diagram of a rice cooker showing an embodiment of the present invention, and Fig. 4 is There is an electrical circuit diagram for the same rice cooker. 4...Rice cooking container, 5...Temperature detection means, 6...
Timer, 7... Heating amount adjusting means, 8... Heating means.

Claims (1)

[Claims] 1. A rice cooking container, a heating means for heating the rice cooking container, a heating amount adjusting means for adjusting the amount of heating by the heating means, a temperature detecting means for detecting the temperature of the rice cooking container, and a boiling point of the temperature sensing means. A rice cooker, comprising: a timer that is activated by a detection output below a point; the rice cooker operates the heating amount adjusting means to reduce the heating amount after a certain period of time measured by the timer.