JPS6088525A - 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] [Technical Field of the Invention] The present invention relates to a rice cooking method in which rice cooking control and heat retention control are performed by controlling the same heating element based on the detection signal of the same inner pot temperature detector. It is related to vessels.

[Prior art]

In conventional rice cookers, rice is cooked by controlling a heating element that heats the inner pot from the bottom based on a detection signal from a temperature sensor installed at the bottom of the outer pot.

Heat retention is controlled by a heating element wrapped around the outer pot body or a heating element placed on the lid based on a detection signal from a temperature sensor placed against the inner pot body or a temperature sensor placed on the outer pot body. I was going to do something. However, this method naturally has the disadvantage that the temperature detector, the heating control element, and the heating element are complicated, the number of parts is large, the assembly is complicated, and the cost is high.

[Summary of the invention]

This invention has been made in view of the above points, and the rice cooking and heat retention heating control means are performed using the same temperature sensor.
-It is constructed by controlling the heating element of
This eliminates the above-mentioned conventional disadvantages.

(Embodiment of the Invention) An embodiment of the present invention will be described below. Fig. 1 is an overall configuration diagram of an embodiment of a rice cooker according to the invention.

As is clear from FIG. 1, the inner pot 1f is provided with a heating body 2 that heats from the bottom and a temperature detector 3 that detects the bottom temperature of the inner pot 1.

Using the detection signal from the temperature detector 3 as input, the heating element 2 is controlled by the rice cooking heating control means 4 during cooking, and by the heat retention heating control means 5 during keeping warm. n.

FIG. 2 is a circuit diagram showing the electrical connections of the embodiment of FIG. 1. In FIG. 2, 13 is an A/D converter 14. memory 1
5. CPU16. The microcomputer has an input circuit 17 and an output circuit 18, and 19 is a voltage dividing resistor circuit composed of a temperature detector 3 and a 2° resistor. Reference numeral 21 denotes an input terminal of the A/D converter 14 built in the microcomputer 13, and inputs the analog potential from the voltage dividing resistor circuit 19 to the A/D converter 14 in order to convert it into a differential value. .

The rice cooking heating control means 6 and the heat retention heating control means T are controlled by the microcomputer 13. Resistance 22. Transistor 23.
Resistance 24. Bidirectional thyristor 10. It is composed of a heating body 2. 12 is a commercial frequency power source.

Next, the operation of the above embodiment will be explained with reference to FIG.

FIG. 6 is a flowchart showing a rice cooking and warming program stored in the memory 15 of the microcomputer 13. In FIG. 3, steps 25, 26 are rice cooking programs, and steps 27, 28, 29 are warming programs.

First, the rice cooking program will be explained. When rice cooking starts, the output of the output circuit 18 is HighK, and the resistor 2
The transistor 23 is ONL through the two transistors, the gate current of the bidirectional thyristor 10 flows through the resistor 24, the bidirectional thyristor 10 is not ON, and the heating element 2 is energized to turn the inner pot 1 on.
Heat the rice inside. The rice in inner pot 1 is heated.

When the water content decreases, the bottom rM degree t+ of the inner pot 1 rises rapidly. The bottom temperature t1 of the inner pot 1 is input to the input circuit 171C through a voltage dividing resistor circuit 19 consisting of a temperature detector 3 and a resistor 20, an input terminal 21 of the microcomputer 13, and a Mu/D converter 14. be done. When the bottom temperature t1 of the inner pot 1 further increases and reaches a predetermined value Tp, the output of the output circuit 18 becomes Low, and the transistor 23 is turned off.
When the bidirectional thyristor 10 is turned OFF'K, the power supply to the heating element 2 is stopped, cooking is completed, and warming is started.

In other words, the process moves to steps 27 and below.

Next, the heat retention program will be explained. Heat retention is a process of keeping the temperature of cooked rice in the inner pot 1 constant at a predetermined value T)1 (for example, 7+C). At the time of completion of rice cooking, the Shirobe temperature U of inner pot 1 is
Since tx is t2>'l', no current is applied to the heating element 2. The bottom temperature 1Z of the inner pot 1 gradually decreases until t2≦T
When it becomes H, the output of the output circuit 18 becomes High, and the transistor 22 and bidirectional thyristor 10 are turned on.9. The heating body 2 is energized to heat the inner pot 1. At this time, the output of the output circuit 18 is a continuous or constant pulse (for example, the period is 16 seconds, the output is High for 2 seconds, and the output is Low for 14 seconds.
ow output). and n degree step 28
Proceed to t2)T)l, then execute step 27 Busy +
If t2≦TH, step 29 is executed and the temperature of the cooked rice in the inner pot 1 is set to a predetermined value T.

keep it constant.

Other Application Examples] Note that although the above embodiment is a rice cooker in which the heating body 2 is powered by electric energy, it is possible to change the heating body 2 to other energy sources such as gas. For example, in a rice cooker that uses gas as an energy source, the heating element 2 is replaced with a burner, and the bidirectional cylinder 10 is replaced with a valve or the like that adjusts the amount of gas.

(Effects of the Invention) As described above, according to the present invention, the rice cooking and heat retention heating control means are configured so that the same heating element is controlled by the same temperature detector, so the number of parts is reduced and the ease of assembly is improved. Therefore, cost reduction can be realized.

[Brief Description of the Drawings] Fig. 1 is an overall configuration diagram of an embodiment of the rice cooker according to the present invention, Fig. 2 is a circuit diagram showing its electrical connections, and Fig. 6 is a flow chart showing the operation of this embodiment. be. In the figure, 1 is an inner pot, 2 is a heating element, 3 is a temperature detector, 4 is a rice cooking heating control means, 5 is a heat retention heating control means, and a t3u microcomputer. Agent Masuo Oiwa (M2 people) Figure 1.1

Claims (1)

[Claims] A heating element that heats the inner pot from the bottom, a temperature detector that detects the temperature of the inner pot, and a rice cooking heating control means and a heat retention heating control means that control the heating element based on a detection signal from the temperature detector. A rice cooker characterized by: