JPS63119710A - Rice cooker - Google Patents

Abstract

(57) [Abstract] 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 for cooking rice and the like in ordinary households.

2. Description of the Related Art A conventional rice cooker of this type employs a microcomputer 1 and peripheral circuits as shown in FIG.
It is a so-called one-chip microcomputer consisting of OM, RAM, input/output ports, etc. Reference numeral 2 denotes a bottom temperature sensor attached to the center of the bottom of a bottomed cylindrical container 3 shown in FIG. has been done. As a result, the temperature signal from the bottom temperature sensor 2 is converted into a binary code and read into the microcomputer 1. Reference numeral 5 denotes a rice cooking switch, and an input is made to the microcomputer 1 to determine whether or not the rice cooking switch 6 is pressed. Reference numeral 6 denotes an AC power source, and a series circuit of a heater 7 and a relay contact 8 for heating rice, water, etc. contained in the container 3 shown in FIG. 4 is connected to the AC power source 6.
The relay contacts 8 are opened and closed by causing current to flow through the relay coil 1o via the transistor 9 in response to a signal from the output port of the microcomputer 1. 11 is a DC power supply for operating the circuit described above.

In the rice cooker configured in this way, the bottom temperature sensor 2 detects the temperature of the water contained in the container 3 together with rice, etc.
When the bottom temperature sensor 2 reaches approximately 90° C., the energization rate of the heater 7 is generally reduced for a certain period of time to allow the rice porridge to be cooked.

However, with this configuration, the detection point of about 90'C on the bottom temperature sensor 2 is too low to detect that the water in the container 3 has started boiling. I ended up cooking the rice without asking her to do it.

Problems to be Solved by the Invention However, with such a conventional configuration, when cooking chicken, vegetables, etc., such as Chinese-style porridge, the energization rate of the heater 7 must be reduced after the water has boiled. The rice porridge is boiled for about 3 hours, but when cooking rice porridge, it only takes about 30 minutes. There was a problem in that the power supply to the heater T had to be manually stopped after checking the timing. When cooking rice porridge like this,
Automatic rice cooking using the timer was not possible.

The present invention solves these problems by accurately boiling the water in the container and by allowing the subsequent simmering time to be set in advance, thereby making it possible to cook porridge without boiling over, etc. To provide a rice cooker capable of cooking delicious rice porridge by setting the cooking completion time using a timer by setting the boiling time according to the porridge menu.

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 container, and a temperature sensor that detects the temperature of the rice, water, etc. in the container. an energization rate control means that reduces the energization rate to the heater when the temperature becomes higher; and a timer means that counts the time after the temperature sensor becomes higher than the predetermined temperature, and stops the energization to the heater when the predetermined time is exceeded. and a setting means for setting a predetermined time of the timer means, and a relay for controlling energization to the heater based on the outputs of the timer means and the energization rate control means.

According to the above structure, the setting means sets the predetermined time of the timer means to start cooking rice, and when the water in the container is heated by the heater and boils, the temperature of the temperature sensor rises, and when it becomes higher than the predetermined temperature. The electrification rate to the heater is lowered and the porridge is heated for the predetermined time set by the timer means set by the setting means to complete the cooking of the porridge, so that delicious porridge can be cooked according to the taste, and as a result, This provides a rice cooker that is easy to use.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2. Components in FIGS. 1 and 2 that are the same as those in FIGS. 3 and 4 shown in the conventional example are given the same numbers, and their explanations will be omitted.

FIG. 1 shows a circuit diagram of a rice cooker according to an embodiment of the present invention, which employs a microcomputer 1 and peripheral circuits. 13 is a liquid crystal display element (hereinafter referred to as LCD), which is connected to the output port of the microcomputer 1 and displays numbers, menus, etc. Reference numeral 14 denotes a setting switch, which is input to the microcomputer 1 to determine whether the contact is open or closed.

Next, the operation of the rice cooker configured as above will be explained. FIG. 2 shows a flowchart of a program stored in the ROM in the microcomputer 1, and its operation will be explained according to the steps of the program shown in this flowchart.

First, in step 1, it is determined whether the rice cooking switch 5 has been pressed, and if it has not been pressed, in step 2, the electricity to the heater is stopped and the process returns to step 1. Then, when it is determined that the rice cooking switch 5 has been pressed, , T3 in step 3:
26 minutes, T4=○ seconds, and in step 4, it is determined whether the setting switch 14 has been pressed, and if it has been pressed,
In step 6, count up the time setting T5 and display it on the LCD.
Display the number in 13 and set T4 = 0 seconds in step 6.
Proceed to. If it is determined in step 4 that the setting switch 14 is not pressed, T4 is counted up in step 7 and the process proceeds to step 6, in which it is determined whether time T4 exceeds 10 seconds, and if Ta < 10 seconds. , return to step 4. If step 6 is 14210 seconds, step 8
Proceed to Step 8 and start energizing the heater.
In step 9, continue listening until the temperature θ of the bottom temperature sensor 2 becomes higher than 90°C, and the temperature θ of the bottom temperature sensor 2 reaches 90°C.
When the temperature becomes higher than 0°C, proceed to step 10.

In step 10, start counting time T1, step 1
1, it is determined whether the time T exceeds the set time T3. If the time 1 exceeds the set time T3, the process returns to step 2, and if it does not, the process proceeds to step 12. Step 1
2 determines whether time 2 exceeds 6 seconds and calculates time T.
If 2 is less than 5 seconds, the heater 7 is energized in step 13 and the process returns to step 11. When the time T2 exceeds 6 seconds in step 12, the energization to the heater 7 is stopped in step 14, and the process proceeds to step 16. In step 15, it is determined whether the time T2 exceeds 32 seconds, and if the time T2 is 32 seconds or less, the process returns to step 11. Time T in step 15
If T2 exceeds 32 seconds, step 16 sets T2=o seconds and the process proceeds to step 11.

Effects of the Invention As described above, according to the present invention, the setting means sets the predetermined time of the timer means to start cooking rice, and when the water in the container is heated by the heater and boils, the temperature of the temperature sensor rises. When the temperature rises above a predetermined temperature, the energization rate to the heater is reduced, and the heating is completed for the predetermined time set by the timer means set by the setting means, so that the rice porridge is completely cooked. The boiling time can be selected according to preference, from porridge with rice to porridge with only rice, and delicious porridge can be cooked in this way, so an easy-to-use rice cooker with a simple configuration can be provided.

[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 a flowchart showing an example of a program of the rice cooker, FIG. 3 is a circuit diagram of the conventional rice cooker, and FIG. 4 is a cutaway side view of the rice cooker. 1・°゛・・・Microcomputer, 2・・・・・・
Bottom temperature sensor, 5...Rice cooking switch, 7...
...Heater, 8...Relay contact, 10...
Song/relay coil, 13...Liquid crystal display element, 1
4... Setting switch. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
Mike Ucon Ji Ichiya? - No. 5 Swamp Sea ℃ Scissor J-S Momme Roku (Switchboo Jita 8-Relay 15 races, fO-Relay Koi Yshir3- R Crystal Display System Child FD-8 Fuiwana Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] A cylindrical container with a bottom, a heater that heats the rice, water, etc. stored in the container, a temperature sensor that directly or indirectly detects the temperature of the rice, water, etc. in the container, and this temperature sensor. an energization rate control means that reduces the energization rate to the heater when the temperature becomes higher than a predetermined temperature; and a energization rate control means that counts the time after the temperature sensor becomes higher than the predetermined temperature, and stops energization to the heater when the predetermined time is exceeded. A rice cooker comprising a timer means for stopping the timer, a setting means for setting a predetermined time of the timer means, and a relay for controlling energization to the heater based on the outputs of the timer means and the energization rate control means.