JPS6031712A - Electric 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] (b) Industrial application field The present invention relates to an electric rice cooker with a water absorption device.

(b) Prior Art Recently, a so-called microcomputer-type jar rice cooker has been proposed that automatically absorbs water for a predetermined period of time below the gelatinization temperature at the start of rice cooking.

As a specific example of this water absorption operation, heating is stopped by detecting a specific temperature (approximately 401) below the gelatinization temperature after rice cooking starts using a heat-sensitive element, and then detecting a temperature change within a certain period of time. is converted into a change in the amount of rice cooked, water is absorbed by setting the water absorption time (heating stop time) according to the amount of rice cooked, and after water absorption is completed, heating is continued and the temperature is automatically set to the optimum temperature for keeping the rice warm after completion of cooking. The heat retention operation is performed at approximately 70°C.

However, if you continue to stop the warming operation and start cooking rice immediately, the temperature of the heat sensitive body will be about 7, even though the rice and water are at a low temperature.
Since the heat retention temperature was 01S, the rice was heated suddenly and continuously without any water absorption, resulting in rice that was cooked and had a firm core without the moisture sufficiently penetrating into the rice grains. Also, if a power outage occurs during the rice cooking operation,
This resulted in a reset state, and after the power was restored, water absorption was performed again, resulting in a longer cooking time than necessary.

(C) Purpose of the Invention The present invention provides a first program that performs a normal rice cooking operation and a second program that performs a rice cooking operation under special conditions, and executes the second program in the event of a momentary power outage. This shortens the cooking time and improves the quality of the rice.

B) Structure of the Invention A heating means for heating the object to be heated, a temperature detection means for detecting a specific temperature below the gelatinization temperature during heating and cooking, and a device for absorbing water with a heating stop time depending on the amount of the object to be cooked. a first program having a water absorption means; a second water absorption means that is executed when the temperature is above a specific temperature and stops heating for a predetermined period of time to absorb water; and a predetermined temperature rise detection means that detects a temperature rise above the predetermined temperature. It is composed of the second program with

(E) Embodiment FIG. 1 shows a partial sectional view. (1) is a cylindrical frame,
(21 is a bottomed cylindrical outer pot provided in the frame, (I(
1 is a heating means for heating the food to be cooked (cooked rice) provided at the inner bottom of the outer pot, and a ring-shaped sheathed heater (31) is used, and its total heating amount is set to 800W. (4) is a frame cover that fixes the upper periphery of the frame (1) and the outer pot (2); (5) an inner pot that accommodates the food to be cooked, which is removably provided in the outer pot (1); (6) is the outer pot (
2) is a heat-sensitive element which is always energized so as to protrude upwards at the center of the bottom surface; (7) is a lid whose negative side is pivoted to the frame (1) so that it can be opened and closed; 81 and lower plate (9
). 0 [ is a temperature detection element such as a thermistor that is attached to the outer wall of the outer pot (2) and is always energized to be in elastic contact with the outer wall of the inner rif 51, (111 is fixed to the lower part of the frame (1) Back frame, (switch lever that closes rice cooking switch Oj by suppressing operation, (II
J is a heat-retaining heater attached to the upper outer wall of the outer pot (1).

Next, the block diagram shown in FIG. 2 will be explained.

(~ indicates the inner pot (5). (B) is a temperature detection means using the heat sensitive element 11ω, (C1 is a specific temperature (about 40°C) at which the temperature of the heat sensitive element 11ω is below the gelatinization temperature (about 60°C) temperature comparison means for detecting and causing a change in the output signal, p
) is the first program executed by the output signal of the temperature comparison means (C1), and in the embodiment, it is a specific temperature (approximately 4D°C).
) It is executed at the following times to perform the so-called normal rice cooking operation. (
The second program is the second program executed by the output signal of the temperature comparison means tC+, and is used to perform rice cooking under special conditions such as a power outage or when heating is stopped during a heat retention (mJ) operation and rice is suddenly started. One program (to explain in detail, IFI adds FA means times to the total heating amount (80
A first low heating means that heats from 0W to half heating 1 (400W), (Gl is a first water absorption means that performs a water absorption operation, and a system that detects the amount of rice to be cooked after heating by the first low heating means) It consists of a determining means (1) and a third heating stop time period (1) in which heating is stopped and water absorption is performed according to a time setting by a counter 1.7) according to the amount of rice to be cooked after determining the amount.

This first water absorption means detects the rate of temperature rise within a predetermined time after heating is stopped, and if the rate of rise is high, it is determined that the amount of rice to be cooked is small and the heating stop time is lengthened, and if the rate of increase is small, the amount of rice to be cooked is increased. It is determined that there is a lot of rice being cooked, and the heating stop time is shortened.

Continuing on, regarding the second program (c), the ILI is a temperature storage means for storing the temperature of the heat sensitive body fl[fi at the beginning of execution of the second program, and the temperature storage means for storing the temperature of the heat sensitive body fl[fi] is heated at half of the heating n for a certain period of time (tl) shown in FIG. ) second low heating means for heating, +Nl
is a temperature rise detection means that detects a temperature rise of more than a predetermined temperature within a predetermined time (t2) set by a counter (no) after heating by the second low heating means. The temperature between the quantity determination start temperature (70°C), which will be described later, is divided into equal parts at fixed temperature intervals, and the temperature is calculated based on the temperature stored by the temperature storage means after heating by the second low heating means. Assuming that the memory is at point a, how much does the temperature rise from this temperature and the step (L3) of the part closest to the set temperature steps (Ll) to (Lm)?
) is detected. Therefore, if the nearest step CIJI) has been reached, it is determined that there was a momentary power outage, etc. and the power has returned and the second program (g)) has been executed, and conversely, the nearest step has been reached. If not, it is determined that the warming operation was stopped during the warming operation and the rice cooking operation was suddenly started. That is, in the case of a power outage at n o'clock, the temperature of the heat-sensitive element 0ω is low before the operation of the first program (the water absorption means (Gl) during the execution of the koji), so after the power outage is restored, the temperature comparison means +01 is again used to reduce the temperature below the specified temperature. Assuming that there is a first program (Dl), execute the first program (Dl). Day) is the second water absorption means that is executed when there is no upper limit above the predetermined temperature determined by the temperature rise detection means TNI, and the heating is stopped for a predetermined time (t3) by the counter (S) regardless of the rice to be cooked. It is composed of a second heating stop means (Ul). The rice cooking amount detecting means detects the temperature rise rate between about 70° C. (1 judgment start temperature) and about 80° C. after heating and sets the cooking power; (b) Heating control means for heating with the heating amount set by (Yl
(+2) indicates the end of rice cooking by turning off the rice cooking switch Q31 +2) indicates a heat retention control means that energizes the heat retention heater (141I) to perform a heat retention operation after the rice cooking is completed.

Therefore, when executing the second program (see Fig. 4), the temperature of the heat-sensitive element 0ω is above a certain temperature, and when there is a momentary power outage or when the rice cooking operation is suddenly performed during the warming operation, the temperature If a predetermined temperature rise is detected by the temperature rise detection means (Nl), it is determined that there is an instantaneous power outage, and the second water suction means port does not perform water suction operation, and the predetermined temperature upper limit control means (off) performs full heating ( Figure 3 solid line)
If there is no rise in the predetermined temperature, it is because the rice and water temperature is low and the temperature rise within the predetermined time (t4) is gradual.
In this case, the water absorption operation is performed by the second water absorption means (31st!J dotted line), and then the fully heated state is reached, indicating that the rice cooking operation is performed from the warming operation.

(F) Effects of the Invention As described above, the present invention includes a heating means for heating rice to be cooked, a temperature detection means for detecting a specific temperature below the gelatinization temperature during cooking, and A first program having a first water absorption means that absorbs water by a heating stop time corresponding to the amount of cooked rice, and a second water absorption means that is executed when the temperature is above the specified temperature and stops heating for a predetermined time and absorbs water. and a temperature rise detection means for detecting a temperature rise above a predetermined temperature, the heating means is fully heated even after the operation of any of the first water absorption means, the second water absorption means, and the temperature rise detection means is completed. Since the predetermined temperature rise detection means jumps over the second water absorption means when the temperature exceeds the predetermined temperature, it is possible to determine whether there is a momentary power outage while the second program is being executed or whether the warming operation is stopped and the rice is immediately cooked. , heating can be performed according to each state. In other words, in the case of a power outage at 1 o'clock, the predetermined temperature rise detection means determines that the temperature is higher than the predetermined temperature, and the second water absorption means is skipped and the entire heating amount is heated. can be shortened.

Further, when rice is cooked in a warm state, the temperature becomes below a predetermined temperature, so the second water absorbing means performs a water absorbing operation to improve the cooked state.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of the electric rice cooker of the present invention, Fig. 2 is a block diagram of the same, and Fig. 5 shows the heat-sensitive element (a) and the rice to be cooked (
FIG. 4 is a characteristic diagram showing the temperature change of the heat-sensitive element. Same...Heating means, (Bo...Temperature detection means, (C1.
・・Temperature comparison means, +D) ・・First program, (J
n: second program, (Gl: first water absorption means,
(Nl... temperature rise detection means, ■... second water absorption means, times... total heating means. Figure 3 I?g same

Claims (1)

[Claims] (1) A heating means for heating the rice to be cooked, a temperature detection means for detecting a specific temperature below the gelatinization temperature during cooking, and a heating stop time depending on the amount of the rice to be cooked when the temperature is below the above-mentioned specific temperature. a first program having a first water absorption means that absorbs water by a second water absorption means that is executed when the temperature is above the specified temperature and stops heating for a predetermined period of time to absorb water; and a temperature that detects a temperature rise above the predetermined temperature. a second program having a rise detection means, the heating means is heated to the full heating amount even after the operation of any of the first water absorption means, the second water absorption means, and the temperature rise detection means is completed, and the temperature rise detection means is an electric rice cooker characterized by skipping the second water absorption means when the temperature is higher than a predetermined temperature.