JPS6232919A - 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 having a microcomputer-controlled boiling detection device.

(Prior art) As shown in Figure 3, conventional rice cookers are equipped with a temperature sensor that detects a sudden rise in temperature at the bottom of the inner pot when rice cooking is finished, and a sensor that is installed inside the lid to detect boiling. Some models are equipped with a lid sensor.

(Problems to be Solved by the Invention) However, such a rice cooker requires two sensors, which increases the cost. For this reason.

Some rice cookers that omit the lid sensor reduce the cooking power before boiling.

(Means for solving the problems) The present invention has been made in order to eliminate the above-mentioned drawbacks,
To obtain a rice cooker that can cook delicious rice by detecting boiling with a single sensor, eliminating parts, and effectively supplying rice cooking power with 3P control. For this purpose, an energization control means is provided to control the energization to the rice cooking heater according to a preset time program, and after energizing the rice cooking heater for a certain period of time, 9 the energization is stopped, and when the energization is stopped and when the electricity is re-energized to the rice cooking heater. The boiling state is determined by a comparison means that compares the output temperature via a temperature sensor that detects the temperature of the inner pot, and the rice cooking heater is continuously energized until a certain temperature is detected by the temperature sensor, and then the time program is performed by the energization control means. The power supply to the rice cooking heater is controlled accordingly.

(Function) By doing this, one sensor can reliably detect the boiling state and efficiently energize the rice cooking heater.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

The configuration of this embodiment is as shown in FIG. 1, and FIG. 2 similarly shows the output temperature characteristics of the temperature sensor and the energization state according to the time program. In the figure, 1 is a cylindrical body with a bottom,
A removable inner pot 4 is housed inside. 2 is a rice cooking heater which is installed inside the main body 1 so as to be in close contact with the outer bottom of the inner pot 4.

This is for heating the inner pot 4. A temperature sensor 6 is attached to the outer bottom of the inner pot 1 so as to protrude from a hole formed in the inner pot of the rice cooking heater 2 so as not to come into contact with the rice cooking heater 2. It detects the temperature of

5 is a lid body that covers the upper opening of the main body 9 and the inner pot 4. Reference numeral 6 denotes a control section which is comprised of a microcomputer provided inside the main body 1, and within this control section B is an energization control means 7. A comparison means 8 is provided, and the temperature sensor 3 is connected to the control section B.

Next, the operation of this embodiment will be explained.

When the user puts washed rice and an appropriate amount of water into the inner pot 4 and operates the rice cooking switch (not shown), the energization control means 7 is activated.
The rice cooking heater 2 is energized by this.

P The inner pot 4 is heated by ON-OFF control of the rice cooking heater 2 according to a time program built in the energization control means 7. For example, after the rice cooking switch is operated, electricity is started to be applied to the rice cooking heater 2 via the appropriate electricity control means 7, electricity is applied for 10 minutes, and then electricity is stopped for 1 minute. At this time, the output temperature of the temperature sensor 3 when the current supply is stopped (Fig. 2 ■) is temporarily stored in the comparing means 8, and compared with the output temperature of the temperature sensor 6 immediately before the power supply is restarted one minute later (Fig. 2 ■). A comparison is made by means 8. If the comparison results are almost the same, it is determined that boiling has occurred.
The time program is switched via the control unit 6 according to the boiling situation. If the above comparison results are not equivalent (FIG. 2), the rice cooking heater 2 is continuously energized via the control section 6 according to the time program of the energization control means 7. For example, turn on the power for another 5 minutes, turn off the power for 1 minute, and then use the previous method (Fig. 2 ■,
(according to ()), and if it is determined that it is boiling, it will switch to the time program, and if it is not boiling (Figure 2)
.

Further, the boiling determination step P is sequentially carried out by applying electricity for 6 minutes, stopping electricity for 1 minute, and detecting boiling (according to Figure 2 (2) and (2)).

Note that the rice cooking heater may be energized until a certain constant temperature is detected by a temperature sensor, and then the above-mentioned time program may be executed.

(Effects of the Invention) As described above, according to the present invention, the output temperature of one temperature sensor is energized to the rice cooking heater for a certain period of time by the 9 energization control means, then stopped for a certain period of time, and compared by the comparison means before and after energization is re-energized, and the boiling state is determined. By detecting this, it is possible to omit nine parts and to obtain a rice cooker that can cook delicious rice by effectively controlling the supply such as reducing the cooking power after detecting boiling.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a rice cooker according to an embodiment of the present invention when the inner pot is being taken out, and Fig. 2 is a correlation between the output temperature of the same temperature sensor, the water temperature inside the inner pot, and the power supply state to the rice cooking heater. FIG. 3 is a 7P characteristic diagram showing the correlation between the output temperature of the temperature sensor of a conventional rice cooker, the temperature inside the inner pot, and the power supply state to the rice cooking heater. 2...Rice cooking heater. 3...Temperature sensor. 7...Electrification control means. 8. Means of comparison.

Claims (1)

[Scope of Claims] 1. A rice cooker equipped with a main body equipped with a rice cooking heater that heats a removably housed inner pot, and a temperature sensor that detects the temperature of the inner pot, for cooking rice according to a preset time program. An energization control means (7) for controlling energization to the heater (2), and a energization control means (7) for energizing the rice cooking heater (2) for a certain period of time and then stopping the energization;
The output temperature of the temperature sensor (3) when this stops and the temperature sensor (3) when power is re-energized to the rice cooking heater (2).
A rice cooker characterized in that it is equipped with a comparing means (8) for comparing the output temperature of the temperature sensor (3), and uses the comparison result of both output temperatures of the temperature sensor (3) to determine a boiling state. 2. The energization control means (7) continues to energize the rice cooking heater (2) until a certain constant temperature is detected by the temperature sensor (3), and after the certain certain temperature is detected, it turns on the rice cooking heater (2) according to the preset time program. 2) The rice cooker according to claim 1, which controls energization of the rice cooker.