JPH03112515A - Cooker - Google Patents

Abstract

PURPOSE:To prevent the taste and form of a cooked material from being deteriorated due to drop of dew inside a lid during warming by applying an electric current to a Iid heating portion at full power when the temperature of the lid is less than a designated temperature and reducing the electricity application rate to the lid heating portion when it is above a designated temperature so as to control the temperature of the lid to a fixed level. CONSTITUTION:Signals of a lid temperature detecting means 10 and a pot temperature detecting means 9 are input to a control means 11, and the control means 11 controls a bottom heater driving means 6 and a drum heater driving means 7 so that the temperature of the pan 1 is a certain temperature theta1 in a warming process, controls the lid heater driving means 8 to apply an electric current to a lid heater at full power when the temperature of a lid 4 is below a certain temperature phi1, and controls the lid heater driving means 8 to reduce the electricity application rate to the lid heater 5 when the temperature of the lid 4 is above a certain temperature phi1, so that the temperature of the lid 4 is controlled to be at a fixed temperature phi2. Thus, dew is difficult to adhere to the inside of the lid so that the taste and form of a cooked material in the pan can be prevented from being deteriorated due to drop of dew in the pan.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cooking appliance such as a rice cooker used at home.

BACKGROUND OF THE INVENTION The structure of a conventional cooking device will be explained with reference to FIG. In FIG. 4, 50 is a pot for storing food, 51 is a bottom heater that heats the bottom part of the pot 50, 52 is a body heater that heats the side part of the pot 50, 53 is a base that closes @50, and 54 is a bottom heater that heats the bottom part of the pot 50. 55 is a body heater drive means for supplying electricity to the bottom heater 51; 56 is a pot temperature detection means for detecting the temperature of the pot 50; and 57 is a pot temperature detection means 56. This control means inputs a signal and controls the bottom heater drive hand P154 and the body heater drive means 55 so that the temperature of the pot 50 reaches a certain temperature θ during the heat retention process.

Next, the operation of the conventional cooking device will be explained using FIG. 5. In step 60, the heat retention process begins, and then in step 61
The control means 57 inputs the signal from the pan temperature detection means 56 and determines whether the temperature θ of the pan 50 is higher than θ1 = 71.5°C, and if it is high, the bottom heater drive means 54 and the body heater drive means 55 to turn off the power to the bottom heater 51 and the body heater 52. Conversely, when the temperature was low, the bottom heater 51 was energized at a rate of 1/16 and the body heater 52 was energized at a rate of 15/16.

Problems to be Solved by the Invention However, with the above configuration, when the lid is opened and then closed again while it is being kept warm, since the lid is cold, dew immediately forms on the inside of the lid, and the dew forms on top of the food. They fall onto the surface and deteriorate the taste, shape, etc. of cooked foods. Particularly when cooking rice to keep it warm, there is a problem in that when dew falls on the rice, the rice contains a lot of moisture, causing it to lose its shape or turn white.

The present invention solves the above conventional problems by preventing dew from forming on the inside of the lid and keeping the food warm without deteriorating the taste or shape of the food due to dew falling onto the food. The purpose is to provide a cooking device that can

Means for Solving the Problems In order to solve the above problems, the cooker of the present invention includes a pot for storing food, a bottom heating section for heating the bottom part of the pot,
A body heating section that heats the side portion of the pot, a lid that closes the pot, a mold heating section that heats the base, a bottom heating section drive means that supplies electricity to the bottom heating section, and a body heating section that heats the pot. a body heating section drive means for supplying electricity to the mold heating section, an indigo heating section drive means for supplying electricity to the mold heating section, a pot temperature detection means for detecting the temperature of the pot, and a 萱 that detects the temperature of the lid. Signals from the temperature detecting means, the lid temperature detecting means, and the pot temperature detecting means are inputted, and the bottom heating section driving means and the body heating section are controlled so that the temperature of the pot reaches a certain temperature θ in the heat retention step. The driving means is controlled, and when the temperature of the lid is below a certain temperature φ1, the lid heating section driving means is controlled to make the electricity to the mold heating section full power, so that the temperature of the lid is at a certain temperature φ.
When it is 1 or more, the control means is provided for controlling the lid heating section driving means to reduce the energization rate to the mold heating section and controlling the temperature of the lid to be a constant temperature φ2. .

Effect With the above-mentioned configuration, the temperature of the pot is maintained at a constant temperature θ1, and when the lid temperature is lower than a certain temperature φ1, the energization to the mold heating part is maximized, and when it is higher, the energization rate is reduced, and the energization rate is kept at a certain level. The temperature can be maintained at φ2, and dew is less likely to form on the inside of the indigo, thereby preventing dew from falling onto the food in the pot and deteriorating the taste, shape, etc. of the food.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of a cooking device according to an embodiment of the present invention. In Figure 1, 1 is a pot for storing food;
2 is a bottom heater that heats the bottom part of the pot 1, 3 is a body heater that heats the side part of the pot 1, 4 is a sauce that closes the pot 1, 5 is a lid heater that heats the waka 4, and 6 is a bottom heater 2 7 is a body heater drive means that energizes the body heater 3; 8 is a lid heater drive means that energizes the lid 5; 9 detects the temperature of the pot 1; 10 is a lid temperature sensing means for sensing the temperature of the lid 4. 11 is a control means which inputs signals from the base temperature detection means 10 and the pot temperature detection means 9, and controls the bottom heater drive means 6 and the body heater drive means so that the temperature of the pot 1 reaches a certain temperature θ1 in the warming process. 7, the temperature of I4 is set to a certain temperature φ
1 or less, the base heater driving means 8 is controlled to energize the lid heater 5 at full power, and when the temperature of I4 is higher than a certain temperature φ1, the base heater driving means 8 is controlled to turn on the base heater 5. The energization rate to the heater 5 is reduced to control the temperature of lI4 to be a constant temperature φ2.

Figure 2 shows an example of the circuit diagram of the same cooker. In Figure 2, 1 is a pot for storing food, 2 is a bottom heater that heats the pot 1, and 3 is a body heater that heats the side part of @1. , 4 is l5
A lid 5 for closing J1 is a lid heater for heating the lid 4, which is the same as that shown in FIG.

The bottom heater driving means 6 that supplies electricity to the bottom heater 2 is composed of a relay contact 5a, a relay coil 6b, a transistor 6c, and a resistor 6d, and one end of the relay contact 6a is connected to an AC power source 12.
In, fl! ! #i is connected to the bottom heater 2. The relay coil 6b has one end connected to the DC power supply 13, the other end to the collector of the transistor 6C, the emitter of the transistor 6C to the ground, and the base of the transistor 6C to the DC power supply 13 via the resistor 6d. , a microcomputer 14 constituting the control circuit 11
connected to the output boat. The torso heater driving means 7 for energizing the torso heater 3 includes a bidirectional thyristor 7a,
Consisting of a resistor 7b, a transistor 7c, and a resistor 7d, the T1 terminal of the bidirectional thyristor 7a is connected to the AC power supply 12, and the T2 terminal is connected to the AC power supply 12.
The terminal is connected to the body heater 3, and the gate terminal is connected to the collector of the transistor 7C via the resistor 7b.
The emitter of C is connected to ground and transistor 7C
The base of the lid is connected to the DC power supply 13 via a resistor 7d, and the lid driver driving means 8 for energizing the sixth base heater 5 connected to the output port of the microcomputer 14 is a bidirectional thyristor. The bidirectional thyristor 8 consists of a resistor 8a, a resistor 8b, a transistor 8c, and a resistor 8d.
The T1 terminal of a is connected to the AC power supply 12, and the T2 terminal is connected to the lid heater 5.
The gate terminal is connected to the collector of the transistor 8C via the resistor 8b, the emitter of the transistor 8C is connected to the ground, and the base of the transistor 8C is connected to the DC power supply 13 via the resistor 8d, and the microcomputer 14 connected to the output boat. The pot temperature detection means 9 for detecting the temperature of the pot 1 is a thermistor 9.
a, resistor 9b, A/D converter 9C1 resistor 9d, resistor 9e
The thermistor 9a is connected to the DC power supply 13,
A voltage corresponding to the pan temperature is input to the A/D converter 9C by this thermistor 9a and the resistor 9b connected to it.
A by resistors 9d and 9e connected in series to the DC power supply 13
A reference voltage for A/D conversion is input to the /D converter 9C.

Further, the output terminal of the A/D converter 9C is connected to the input port of the microcomputer 14, and temperature data of the pot 1 is inputted thereto. Mold temperature detection means 10 for detecting the temperature of W4
is a thermistor 10a, a resistor 10b, an A/D converter 10
c, resistor 10d, resistor 10e, and thermistor 10
a is connected to the DC power supply 13, and the A/D converter 10c is connected to the thermistor 10a and the resistor 10b connected thereto.
A voltage corresponding to the lid temperature is input to the A/D converter 1 by resistors 10d and 10e connected in series to the DC power supply 13.
A reference voltage for A/D conversion is input to 0c. Further A/
The output terminal of the D converter 10c is connected to the input port of the microcomputer 14, and temperature data of 4 is input thereto.

The operation of the above configuration will be explained using the flowchart of FIG. In Figure 3, step 2
At 0, the heat retention process begins, and at step 21, the temperature θ of pot 1 reaches θ.
For example, the microcomputer 14 determines whether the temperature is higher or lower than 71.5° C. using the output of the A/D converter 9C. If the temperature θ of the pot 1 is higher than θ1, the process proceeds to step 22. In step 22, the microcomputer 14 sets the inputs to the bases of the transistors 6c and 7c to a low level, and turns off the transistors 6c and 7c.
The relay contact 6a and the bidirectional thyristor 7a are turned off to stop energizing the bottom heater 2 and the body heater 3.

Conversely, if the temperature θ of silk 1 is lower than θ1, step 2
In step 23, the output of the microcomputer 14 input to the transistor 6c is turned off for 1 second out of 16 seconds, and during that time, the transistor 6C is turned on to excite the relay coil 6b, and the relay contact 6a is turned off for 16 seconds. It is turned on for 1 second, and the bottom heater 2 is energized at an energization rate of 1/16. In addition, the output of the microcomputer 14 input to the transistor 7C is turned off for 15 seconds out of 16 seconds, the transistor 7c is turned on during that time, the bidirectional thyristor 7a is turned on for 15 seconds out of 16 seconds, and the body heater 3
The current is applied at a energization rate of 15/16. Step 22
．． The process proceeds from step 23 to step 24, where the microcomputer 14 determines whether the temperature φ of the lid 4 is higher or lower than φ, for example, 70° C., using the output of the A/D converter 10c. If the temperature φ of the lid 4 is higher than φ1, proceed to step 25. In step 25, it is determined whether the temperature φ of M4 is higher or lower than φ, for example, 112°C.
The microcomputer 14 makes a determination using the output of the A/D converter 10c. If the temperature φ of the lid 4 is higher than φ2, the process proceeds to step 26. In step 26, the microcomputer 1 is input to the base of the transistor 8c.
4 is set to a low level, transistor 8C is turned off, bidirectional thyristor 8a is turned off, and power supply to base heater 5 is stopped. In step 25, if the temperature φ of the lid 4 is lower than φ2, proceed to step 27, step 27
Now, the output of the microcomputer 14 connected to the base of the transistor 8C is turned off for 8 seconds out of 16 seconds,
The transistor 8C is turned on for 8 seconds, the bidirectional thyristor 8a is turned on for 8 seconds, and the lid heater 5 is energized at an energization rate of 8/16. In step 24, if the temperature φ of M4 is lower than φ1, the process proceeds to step 28. In step 28, the output of the microcomputer 11, which is input to the base of the transistor 8c, is turned off, and the transistor 8C is turned on, so that the bidirectional The thyristor 8a is turned on and the lid cap 5 is energized at an energization rate of 16/16. From steps 26 to 28, the process returns to step 21 and the above operations are repeated.

According to this embodiment, even if the user opens and closes the lid while keeping warm, the lid is heated to a high temperature, making it difficult for dew to form on the inside of the lid. It evaporates due to the heat from the lid heater. Furthermore, even if the lid cools down rapidly and becomes prone to forming dew, the indigo heater heats the lid at full power, preventing dew from forming. This prevents dew from falling onto the food in the pot and deteriorating the taste, shape, etc. of the food.

Furthermore, although a heater is used in the heating section in this embodiment, an induction heating coil or the like may be used.

Effects of the Invention As described above, according to the present invention, the temperature of the pot is maintained at a constant temperature, and when the temperature of the lid is lower than a certain temperature φ1, the energization to the lid heating part is maximized, and when it is higher, the energization rate is reduced. By making it smaller, the temperature of the toad can be maintained at a certain constant temperature φ2, so even if the user opens and closes the lid while keeping it warm, dew will not form on the inside of the lid, and even if there is dew, the lid will not heat up. evaporates due to heat. Furthermore, even if the lid cools down rapidly and becomes prone to condensation, the lid is heated at full power so no condensation will form. Deterioration can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a cooking device according to an embodiment of the present invention, and FIG.
The figure shows an example of the circuit of the same cooking device, FIG. 3 is a flowchart showing the operation of the same cooking device, FIG. 4 is a block diagram of the conventional cooking device, and FIG. 5 shows the operation of the conventional cooking device. FIG. 1... Pot, 2... Bottom heater, 3... Body heater, 4
... Lid, 5... Lid heater, 6... Bottom heater drive means, 7... Cylinder drive means, 8... Lid heater drive means, 9... #j1 temperature detection means , 10... Lid temperature detection means, 11... Control means.

Claims (1)

[Claims] 1. A pot for storing food, a bottom heating section that heats the bottom of the pot, a body heating section that heats the sides of the pot, a lid that closes the pot, and a lid heating that heats the lid. a bottom heating section driving means for supplying electricity to the bottom heating section; a body heating section driving means for supplying electricity to the shell heating section; and a lid heating section driving means for supplying electricity to the lid heating section. , a pot temperature detection means for detecting the temperature of the pot; a lid temperature detection means for detecting the temperature of the lid; signals from the lid temperature detection means and the pot temperature detection means are input; The bottom heating part driving means and the body heating part driving means are controlled so that the temperature of the lid becomes a certain temperature θ_1, and when the temperature of the lid is below a certain temperature φ_1, the lid heating part driving means is controlled. When the lid heating section is energized at full power and the temperature of the lid is above a certain temperature φ_1, the lid heating section driving means is controlled to reduce the energization rate to the lid heating section, and the lid heating section is energized at full power. A cooking device comprising a control means for controlling the temperature to a constant temperature φ_2.