JPS6226035A - 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 the Invention The present invention relates to microcomputer-controlled rice cookers, which have become common in recent years.

Conventional technology This type of rice cooker is shown in Fig. 5 ((a) under normal conditions, (b) under abnormal conditions when the saturation temperature is high due to voltage fluctuations or foreign objects, etc.). The temperature sensor indicates the end of rice cooking (dry-up temperature Ta).

Tb) was detected. This takes advantage of the characteristic that while water remains inside the inner pot, it is saturated at certain temperatures a and b (approximately 100°C), but when the water runs out, the bottom temperature of the pot rises rapidly.

Problems to be Solved by the Invention However, "variations" occur in the saturation temperatures a and b due to voltage fluctuations, the degree of contact between the inner pot and the rice-cooking heater, and the like.

Also, since there is "variation" in the output temperature of the temperature sensor, in order to take this "variation" into consideration and prevent malfunctions during rice cooking, set the dry-up temperatures Ta and Tb high (usually 130 degrees Celsius or higher). There is a need for "
There was a problem where the "burning" was getting stronger.

Means to Solve the Problems The present invention has been made to solve the above problems, and aims to provide a rice cooker that reduces malfunctions related to dry-up temperature detection during rice cooking and reduces "burning". be. For this purpose, a saturation temperature detection means is provided which reads the output temperature change of the temperature sensor at regular intervals, and the rice is cooked when the temperature reaches the temperature determined by the dry-up temperature setting means which determines the dry-up temperature based on the detected saturation temperature. A dry-up detection means is provided for terminating the dry-up.

By doing this, it is possible to detect whether the saturation temperature is high or low, and to correct and set the dry-up temperature according to each saturation temperature.

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 FIGS. 1 and 2,
FIG. 6 is a flowchart related to the operation.

FIG. 4 shows the output temperature characteristics of the temperature sensor during (a) normal times and (b) abnormal times when the saturation temperature increases due to voltage fluctuations, foreign matter, etc. In the figure, 1 is the main body, 2 is the rice cooking heater, 6 is the inner pot, and 4 is the temperature sensor.

5 is a control section, 6 is a saturation temperature detection means, 7 is a dry-up temperature setting means, and 8 is a dry-up detection means.

T means the output temperature of the temperature sensor at each time, and does not always mean the same temperature.

Here, the main body 1 houses a removable inner pot so as to come into contact with a rice cooking heater 2 attached to the inner bottom. The temperature sensor 4 is attached to the center of the inner bottom of the main body 1 so as not to come into contact with the rice cooking heater 2, and is in contact with the inner pot 6. Furthermore, a control section 5 is provided inside the main body 1,
This control section 5 includes a saturation temperature detection means 6. Dry-up temperature setting means 7. And a dry-up detection means 8 is provided.

The temperature sensor 4 is connected to the control section 5.

Next, the operation of this embodiment will be described.

When a user puts rice and water into the inner pot 6 and turns on a rice cooking switch (not shown), power is started to be applied to the rice cooking heater 2, which heats the rice and water inside the inner pot 3. Therefore, Fig. 4(a),
As shown in (b), the output temperature of the temperature sensor 4 also rises and eventually becomes saturated at the saturation temperatures A and B. At this time, the 6th
As shown in the figure, the saturation temperature detection means 6 detects the saturation temperature at the start of rice cooking (X=0
), the output temperature (T°C) of the temperature sensor 4 is read at fixed time intervals (X=X+1...X≧100), and at this time (X
≧100) temperature (T2) is almost the same temperature (T2) as the temperature (T1) read previously (X=X+1)
It is judged to be saturated when , and the saturation temperature is A.

Detect B. When the saturation temperatures A and B are detected, the dry-up temperature setting means 7 sets the dry-up temperatures TA (T2) and TB (T3) according to the saturation temperatures A and B, respectively.
Set respectively. For example, the saturation temperature A (100C).

Dry-up temperature TA (T2=
120℃).

'rB (T3=1300). That is, the higher the saturation temperatures A and B, the higher the dry-up temperatures TA and TB.
set high. Next, when the water inside the inner pot 6 evaporates or is no longer absorbed by the rice, the temperature at the bottom of the inner pot 6 rises rapidly. Eventually, when the dry-up temperatures TA and TBK set by the dry-up temperature setting means 7 are reached, the dry-up detection means 8 detects the temperature (T4) that has suddenly increased at the bottom of the inner pot 6 as the output temperature (T'C) of the temperature sensor 4. . The temperature (T4) is the dry-up temperature TA (T2).

When the temperature exceeds TB (T3), the power supply to the rice cooking heater 2 is stopped and the rice cooking is finished.

Effects of the Invention (1) According to the present invention, the dry-up temperature is set according to the saturation temperature, so the dry-up temperature in normal times can be set low, and the saturation temperature related to voltage fluctuation and the degree of contact between the inner pot and the rice cooking heater can be reduced. As the temperature rises, the dry-up temperature can be set higher.

It is possible to obtain a rice cooker that eliminates malfunctions and has less "scorching".

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a rice cooker according to an embodiment of the present invention;
FIG. 2 is a perspective view of the container being taken out, FIG. 6 is a flowchart of the same, and FIG. 4 is an output temperature characteristic diagram of the temperature sensor during normal times (a) and abnormal times (b). Figure 5 shows the conventional rice cooker in normal conditions (a) and abnormal conditions (b)
FIG. 3 is an output temperature characteristic diagram of a temperature sensor of FIG. 3...Inner pot, 4...Temperature sensor. 6...Saturation temperature detection means. 7...Dry-up temperature setting means. 8...Dry-up detection means. A, B...Saturation temperature. TA + TB...Dry-up temperature.

Claims (1)

[Claims] The saturation temperature (A), (B) is determined through the temperature sensor (4) that is thermally connected to the bottom of the inner pot (3) and the presence or absence of an output temperature change of the temperature sensor (4) read at regular intervals. saturation temperature detection means (6) for detecting the saturation temperatures (A), (
B) Dry-up temperature (T_A), (T_B) according to
A rice cooker characterized by comprising: a dry-up temperature setting means (7) for determining the dry-up temperature; and a dry-up detection means (8) for detecting the dry-up temperatures (T_A) and (T_B) to terminate rice cooking.