JPH0317A - Rice boiler - Google Patents

Abstract

PURPOSE:To prevent boil-over, by determining a quantity of rice to be boiled before starting the boiling of the rice so as to decrease the rate of energization of a heating means just before the rices boiling and after a predetermined time elapsing from the determination of the quantity of the rice, if the quantity of the rice to be boiled is large. CONSTITUTION:A heating means 2 heats a pan 1, and a rice quantity determining means 3 determines a quantity of rice to be boiled in the ban 1. A control means 4 receives a signal indicating the quantity of rice determined by the rice quantity determining means 3, and decreases the rate of energization of the heating means, if the quantity of the rice is large, after predetermined time elapsing from the start of the boiling of rice and before the rice boiling in the pan. With this arrangement in which the rate of energization is decreased before the boiling, it is possible to prevent hot water discharged from steam ports, from boiling over so as to contaminate the surroundings of the rice boiler during boiling of rice.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rice cooker for cooking rice used at home.

2. Description of the Related Art Conventionally, rice cookers of this type have been known to have a configuration as shown in the block diagram of FIG. 4, for example. In this example, a pot 24 for storing rice, water, etc. to be cooked, a heating means 25 for heating the pot 24, a pot bottom temperature detection means 26 for detecting the temperature at the bottom of the pot 24, and an opening of the pot Z4 are used. Covering lid 27
The rice cooking process is performed by controlling the energization rate to the lid temperature detection means 28 that detects the temperature of the lid 27 and the heating means 25, and inputting the output signals of the pot bottom temperature detection means 26 and the lid temperature detection means 28. It is composed of a control means 29. In the pre-cooking process, the control means 29 controls the bottom temperature of the pot 24 to be 4.
The energization rate of the heating means 25 is maximized until the temperature exceeds 5°C.
When the temperature exceeds 5°C, the heating means 25 is energized for about 15 minutes at an energization rate of 8/16 so that the bottom temperature of the pot 24 is 55°C.

Next, proceeding to the cooking step, the heating means 250 is heated to its maximum energization rate until the bottom temperature of the pot 24 reaches 80°C. Next, after the bottom temperature of the pot 24 exceeds 80°C, the temperature of the lid 27 increases.
The time until the temperature exceeds 80°C was measured, and the amount of cooked rice was determined based on the length of this time. Further, at this time, the heating means 25 was energized at the maximum energization rate. After the temperature of the lid 27 exceeds 80°C, depending on the determined amount of cooked rice,
Boiling is maintained by changing the energization rate of the heating means 25. That is, if the amount of rice to be cooked was large, the energization rate was increased. Next, when the temperature at the bottom of the pot 24 exceeds 136°C, the process proceeds to the varnishing process and then to the warming process.

Problems to be Solved by the Invention However, with the above configuration, when the amount of rice to be cooked is large in the cooking process, even just before the rice in the pot 24 boils, that is, just before the temperature of the lid 27 exceeds 80°C. Also, since the heating means 25 has the maximum current conductivity, there is a problem in that boiling water boils over from the steam port in the lid 27, staining the area around the rice cooker.

The purpose of the present invention is to solve the above-mentioned problems, and to determine the amount of cooked rice when cooking rice, and when the amount of cooked rice is large, immediately before the rice boils after a certain period of time after determining the amount of cooked rice, The present invention aims to provide a rice cooker that does not cause boiling over by reducing the energization rate of the heating means.

Means for Solving the Problems In order to achieve the above-mentioned object quickly, the present invention provides a pot for storing cooked rice, water, etc., heating means for heating the pot, and a cooking amount for determining the amount of cooked rice in the steel. a determining means; and upon receiving a signal from which the rice cooking amount determining means has determined the amount of cooked rice, if the amount of cooked rice is large, the energization rate of the heating means is adjusted after a certain period of time from the time when rice cooking is started and the amount of rice cooked is determined. The rice cooker is equipped with a control means for reducing the size.

Function As described above, in the present invention, the amount of cooked rice is determined by the rice amount determining means, and when the amount of cooked rice is large, the energization rate of the heating means is reduced immediately before the cooked rice boils after a certain period of time. , the heating state is controlled in accordance with the amount of cooked rice.

Example Hereinafter, the drawings shown as one embodiment of the present invention will be explained.

In Figure 1, l is a pot for cooking rice, water, etc., and 2
is a heating means that heats the steel I. Reference numeral 3 denotes a rice cooking amount determination means for determining the amount of rice cooked in the pot 1. 4 is a control means;
A rice cooking amount determining means 3 receives a signal for determining the rice cooking amount, and when the rice cooking amount is large, the energization rate of the heating means 2 is reduced after a certain period of time from the start of rice cooking before the rice in the pot l boils.

With the above configuration, the energization rate is reduced before boiling, so rice can be cooked without boiling water boiling over from the steam port and staining the area around the rice cooker.

Figure 2 shows a circuit diagram, where l is 5 for cooking rice, water, etc.
It is a pot to put. 2 is a heating means, which uses a heater to heat the pot 1. Note that the heater is not limited to a heater, but a dielectric heating filter using dielectric heating or the like may be used. 6 is a thermistor that detects the temperature at the bottom of pot L. A thermistor 7 detects the temperature of the lid 8. 9 is a microcomputer.

In this circuit, a voltage divided by a thermistor 6 and a resistor IO is input to an A/D converter 11, and a voltage divided by a resistor 12 and a resistor 13 is input to a base 111 of the A/D converter 11.
1! It is input as voltage. Therefore, the A/D converter 11 outputs a signal corresponding to the temperature of the bottom of the pot l detected by the thermistor 6, and inputs the signal to the microcomputer 9. In addition, the voltage divided by the thermistor 7 and the resistor 14 is
The voltage is input to the A/D converter 15, and the voltage divided by the resistors 16 and 17 is input as the reference voltage of the A/D converter 15. Therefore, the A/D converter 15 outputs a signal corresponding to the temperature of the lid 8 detected by the thermistor 7, and inputs the signal to the microcomputer 9. Further, the resistor I8 and the base of the transistor 19 are connected to the output of the microcomputer 9. A relay coil 21 is connected between the flap of the transistor 19 and a DC power source 20, and depending on whether or not this relay coil 21 is excited, ON or OFF of the relay contact 22 is determined. Determine whether to energize. That is, if the output point A of the microcomputer 9 is set to high impedance, the transistor 1g
turns on, energizes the relay coil 21, and relay contact 2
2 is turned on, and the heating means 2 is energized. Conversely, output A
When the point is set to low level, the transistor 19 is turned off and the relay coil 2I is de-energized, and the relay contact 22 is turned off.
becomes low, and the supply of electricity to the heating means 2 is stopped. Note that 23 is a commercial AC power source.

FIG. 3 is a flowchart showing the implementation state of the present invention, and the operation will be explained below using this flowchart.

Pre-cooking is performed in step a, that is, the microcomputer 9 sets the output point A to high impedance and turns on the relay contact 22 until the bottom temperature of the pot l exceeds 45°C, and the energization rate to the heating means 2 is changed. is the maximum. 45℃
When the temperature exceeds 55°C, the heating means 2 is turned on at an energization rate of 8/16 so that the output point A is set to high impedance for 8 seconds out of 16 seconds and set to low level for the next 8 seconds so that the bottom temperature of the pot 1 reaches 55°C.
The heating means 2 is energized, or the output point A is set to a low level, and the energization to the heating means 2 is stopped. Do this for 15 minutes to complete the pre-cooking.

Next, the process proceeds to step b, and the timer 2 starts counting time.

Next, proceed to step C, set the output point A of the microcomputer 9 to high impedance, and set the energization rate to the heating means 2.
Energizes at maximum.

Next, the process proceeds to step d, where it is determined whether the bottom temperature θ of Ml has become higher than 80°C. The microcomputer 9 is A
Input the output of the /D converter II, and if the temperature is not higher than 80°C, return to step C.

If it is higher than 80°C, proceed to the next step e.

In step e, the timer that started timing in step b is
Stop timing. Here, the time measured by timer ■ indicates the time it takes for the temperature θ of pot 1 to go from 55℃ to 80℃, and this time is the amount of rice 5 in pot 1. The more there are, the longer it will be, and the fewer, it will be shorter. Therefore, the amount of cooked rice 5 can be determined based on the length of time measured by the timer (2). Next, the process proceeds to step f, and the microcomputer 9 determines whether the amount of cooked rice is large based on the length of time measured in step e. For example, if the time it takes for the temperature θ of pot 1 to go from 55°C to 80°C is 5 minutes or more, it is determined that the amount of rice cooked is large, and when it is less than 5 minutes, it is determined that the amount of rice is small, or the time is measured. The amount of rice cooked can also be determined in several stages depending on the time. If the amount of rice to be cooked is large, proceed to step g. In step g, the microcomputer 9 starts timer (2).

Next, proceeding to step h, the microcomputer 9 sets the output point A to high impedance, turns on the relay contact 22, and energizes the heating means 2 at the maximum energization rate. Next, proceed to step i, and the time it takes for the rice 5 to boil and boil over from the steam vent is approximately a certain amount of time after determining the amount of cooked rice when the amount of rice 5 is large. For example, if this time is 8 minutes,
It is determined whether these 8 minutes have elapsed. If 8 minutes have not elapsed, return to step h and perform full power heating. After 8 minutes have passed, proceed to the next step j. In step j, the microcomputer 9 sets the output point A to high impedance for 8 seconds out of 16 seconds, and the heating means 2
energize for 8 seconds.

For the next 8 seconds, the output point A is set to low level and heating means 2 is set to 8.
Stops power supply for seconds. Here, the energization rate of the heating means 2 is 8/
16, but any energization rate may be used as long as the energization rate is small enough to prevent the cooked rice 5 from boiling over from the steam vent. Next, proceed to step k, detect the temperature of the lid 8 using the thermistor 7, input the output of the A/D converter 15 to the microcomputer 9, and determine whether the temperature φ of the lid 8 is 80°C or higher. do. If the temperature does not exceed 80°C, return to step j. When the temperature reaches 80°C or higher, proceed to step 1. In step 1, in order to maintain the boiling of the rice 5 in the pot 1, the heating means 2 is energized according to the amount of cooked rice determined in step f. Heat pot I at varying rates. That is, the larger the amount of rice to be cooked, the higher the energization rate of the heating means 2 is to maintain boiling. Next, proceed to step m. A/D
The output of the converter 11 is input to the microcomputer 9, and 1. It is determined whether the bottom temperature θ of the pot l exceeds 136°C. When the temperature is below 136°C, return to step 1 and continue heating at the energization rate according to the amount of rice cooked. When the temperature exceeds 136° C., the process proceeds to the next step n, where the unevenness step is performed, and the process proceeds to step 0, where the process ends. In step f, if it is determined that the amount of cooked rice is small, the process proceeds to step p, and similarly to step C, the pot I is heated with the energization rate of the heating means 2 maximized.

Next, the process proceeds to step q, and the same operation as in step is performed. If the temperature φ of the lid 8 is below 80°C, the process returns to step p, and if it exceeds 80°C, the process proceeds to step l. Full power heating in step p means that the amount of cooking i in step f is
This is because it has been determined that the amount does not boil over even when heated at full power. Therefore, when the amount of rice to be cooked is determined in several stages in step f, the rate of energization to the heating means 2 is reduced depending on the stage so as not to boil over. In other words, when the rice boils, the heater 2 is heated at full power for a certain period of time corresponding to the amount of rice just before it boils over, and after a certain period of time, the power to the heater 2 is reduced according to the amount of cooked rice to prevent it from boiling over. is controlled.

Effects of the Invention As described above, in the present invention, the rice cooking amount determining means receives a signal indicating the rice cooking amount, and when the rice cooking amount is large, the control means is provided to reduce the energization rate of the heating means after a certain period of time from the time of determination. Because of this, boiling can be controlled by reducing the energization rate of the heating means just before boiling, which eliminates the possibility of boiling water boiling over from the steam vent and staining the area around the rice cooker during rice cooking.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram, and FIG. 3 is a flowchart showing the operation of the implementation.
FIG. 4 is a block diagram showing a conventional example. l... Pot 2... Heating means

Claims (1)

[Claims] (1) A pot for storing rice, water, etc. to be cooked, heating means for heating the pot, a rice amount determining means for determining the amount of cooked rice in the pot, and the rice amount determining means determining the amount of cooked rice. and control means for reducing the energization rate of the heating means when the amount of rice to be cooked is large, after a certain period of time from the time when the rice cooking is started and the amount of rice to be cooked is determined. vessel.