JPS623042Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooking device that is equipped with heating control during heating and a function of automatically reheating after heating is completed.

Conventionally, when cooking rice, by first heating over low heat, water absorption into the rice grains is promoted, and subsequent strong heating allows for sufficient gelatinization, and only the rice grains at the bottom gelatinize quickly. This eliminates the problem of poor heat transfer to the top and uneven heating from top to bottom. In addition, even after heating is completed, "steaming" is possible.
By continuing to heat the rice grains for a certain period of time without burning them, the gelatinization of the rice grains is completed, and the excess water remaining between the rice grains is expelled.
It is known to make delicious rice.

The present invention provides an electric rice cooker capable of cooking rice as described above, which has a simple configuration, and which automatically controls heating during heating and automatically reheats after heating is completed.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In the figure, 1 is a main heater that heats the bottom of the inner pot 2.

3 is a rice cooking indicator lamp connected in series with the protective resistor 4 and in parallel with the main heater 1.

5 manually connects the movable contact 6 and the first fixed contact 7.
is an automatic switch that is turned on, and when the temperature at the bottom of the inner pot 2 reaches the set temperature, the movable contact 6 is automatically switched to the second fixed contact 8.

Reference numeral 9 denotes a first switch that is turned on and off in conjunction with the motor 10, and is connected in series with the first fixed contact 7 side of the automatic switch 5 and the main heater 1, and is connected to a power source.

Reference numeral 11 denotes a second rice cooking indicator lamp connected in series with the protective resistor 12 and in parallel with the series circuit of the first switch 9 and the main heater 1.

13 is ON- in conjunction with the motor 10.
A second switch that continuously operates OFF is connected to the second fixed contact 8 side of the automatic switch 5, and is connected to the second fixed contact 8 side of the automatic switch 5.
It is connected in parallel with the switch.

14 is a third switch which operates in conjunction with the motor 10, and which is a parallel circuit connecting the first fixed contact 7 of the automatic switch 5 to this first fixed contact 15 and also connecting the second fixed contact 8 of the automatic switch 5 to this second fixed contact 16;
The series circuit with the motor 10 is connected to a power source.

Reference numeral 17 denotes a fourth switch that operates in conjunction with the motor 10, and includes a series circuit in which the movable contact 18 is connected to the second fixed contact 8 of the automatic switch 5, and the first fixed contact 19. The heat retention indicator lamp 20 is connected, and this second fixed contact 21
and a parallel circuit connecting the reheating indicator lamp 22,
A series circuit with the protective resistor 23 is connected to the power supply. Reference numeral 74 denotes an automatic temperature controller, and a series circuit of this, the auxiliary heater 25, and the main heater 1 is connected to a power source.

Reference numeral 26 denotes an auxiliary heater that continuously generates heat when the automatic switch 5 is operated, and a series circuit of this and the main heater 1 is connected to a power source.

Next, the operation will be explained.

When the inner pot 2 is placed on the main heater 1, the power is connected, and the automatic switch 5 is turned on manually, the main heater 1 starts generating heat, the rice cooking indicator lamps 3 and 11 light up, and the motor 10 starts rotating. Start moving. The time chart of each switch that operates in conjunction with the rotation of the motor 10 is as shown in Figure 3, and the time chart for each switch is as shown in Figure 3.
minutes), the first switch 9 turns OFF,
When the main heater 1 stops generating heat, the rice cooking indicator lamp 3 goes out, and only the second rice cooking indicator lamp 11 is lit. During this time, the warm water at the bottom heated by the main heater 1 replaces the cold water at the top of the inner pot 2, and the cold water comes down to the bottom.

During this time, the motor 10 continues to rotate. After ₂ hours (approximately 2 minutes required for the water to reverse itself), the first switch 9 is turned on again, the main heater 1 resumes generating heat, and the rice cooking indicator lamp 3 lights up. .

Then, after t3 time (slightly longer than t1 plus t2, often about 8 minutes), the third switch 1
4 is the first fixed contact 15 to the second fixed contact 16
The motor 10 stops rotating.
However, before this switch is switched for △t time (approximately 10 seconds from the top of machining accuracy), the fourth switch 17 switches from the first fixed contact 19 to the second fixed contact 2.
Switches to 1. After that, the main heater continues to generate heat and continue cooking. The water in inner pot 2 has run out,
The temperature of the pot bottom starts to rise rapidly, and at the set temperature, the automatic switch 5 switches from the first fixed contact 7 to the second fixed contact 8, the main heater 1 stops generating heat, the rice cooking indicator lamps 3 and 11 go out, and rice cooking is completed. At the same time, the motor 10 starts rotating again and the reheating indicator lamp 22 lights up.

After that, for t4 hours (since the main heater 1 has stopped generating heat, the temperature of the inner pot 2 will drop and the temperature of the rice will rise).
After about 5 minutes without dropping below 100℃, turn on the second switch 13 for t5 hours (to prevent the main heater 1 from generating heat and the bottom temperature of the pot to not rise above the operating temperature of the automatic switch 5 to prevent scorching). about 1
(minutes), the main heater 1 generates heat, and the rice cooking indicator lamps 3 and 11 light up. Thereafter, the second switch 13 is similarly turned from OFF to ON, and the main heater 1 generates heat to continue reheating and gelatinize the rice.

Then, after ₈ hours (approximately 15 minutes, which was determined experimentally as the necessary reheating time so that the rice grains satisfies the temperature of 98℃ for 20 minutes, including the time of cooking), the third switch 14 is turned on. The second fixed contact 16 is switched to the first fixed contact 15, and the motor 10 is stopped. However, this switch changes △
4th time before t time (about 10 seconds from the top of machining accuracy)
The switch 17 switches from the second fixed contact 21 to the first fixed contact 19, and at the same time, the reheat indicator lamp 22 goes out and the keep warm indicator lamp 20 lights up, indicating that the rice is ready to cook. do.

Note that when this motor 10 stops,
The second switch 13, which energizes the main heater 1 during reheating, is set to always be in the OFF state.

After that, the auxiliary heater 26 continuously generates heat to keep the rice at a constant temperature of about 73℃.
, an auxiliary heater 25 controlled by an automatic temperature controller 24, and these auxiliary heaters 2
5, 26 and the main heater 1, which is connected in series and generates a small amount of heat, to keep it warm.

In addition, in this heat retention state, each switch linked to the motor 10 is in the state of starting rice cooking, and by operating the automatic switch 5, the above operation is repeated again. According to one embodiment of the present invention described above, by controlling the heating during cooking and automatically reheating after heating, the center of the rice grains is sufficiently gelatinized, resulting in delicious rice with less uneven cooking. By operating the heating control section and reheating section with the same motor in one cycle, the number of parts can be reduced and implementation can be performed with a simple configuration, and each switch linked to the motor can be The heating control has been designed to stop at the initial state, so it can be operated using only the automatic switch like before, and the conventional heating time is displayed with a reheating indicator lamp, and when heating is finished, it is indicated with a keep-warm indicator lamp. This allows you to know when the rice is ready to eat, and by turning on the heating control switch when reheating, you can not only start cooking from the middle of the heating control section when the switches linked to the motor are not in the start position, but also reheat the rice. It is now possible to start cooking rice in the middle of the cooking process,
The automatic switch always works and you get the rice, and by making the fourth switch that controls the display operate slightly earlier than the third switch that controls the motor, the heating control section If you manually switch the automatic switch to keep warm when the rice is in the cooking mode, the keep warm indicator lamp will light up, and if you switch the heating control section during cooking and set it to reheat, the reheat indicator lamp will light up. , the operating status and display lamp can be matched, the main heater and the main heater, and the heating control first
By installing rice cooking indicator lamps in parallel in the series circuit with the main heater switch, there is no need to install a special display changeover switch.With only the indicator lamps, there are two lights when the main heater is generating heat, and one when the main heater is not generating heat.
Status can be displayed with lights.

As described above, according to the present invention, heating control during heating and reheating are automatically performed after heating is completed, so if applied to an electric rice cooker, rice grains will be sufficiently gelatinized to the center, resulting in uneven cooking. It is possible to easily obtain delicious rice with less waste, and since the heating control section and the reheating section are operated by the same motor as one cycle, the number of parts can be reduced and it can be implemented with a simple configuration. Each switch linked to the motor stops at the initial state of heating control, so no special operation is required.
It can be operated using only an automatic switch, and since the first switch for heating control is turned ON even during reheating, it can be used not only from the middle of the heating control section when the switches linked to the motor are not in the starting position, but also when reheating. Even in the middle of the heating section, the main heater can be made to generate heat by operating an automatic switch, and the heat generation can be stopped by operating the automatic switch, which has the effect of automatically cooking the upper part. The on/off operations of the first to fourth switches from t ₁ to _{t 8} by the motor 10 can be carried out using conventionally known techniques in which each switch is brought into contact with a cam plate attached to the motor shaft. Therefore, details are omitted.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of one embodiment of the present invention;
This figure is also a schematic cross-sectional view, and FIG. 3 is a time chart in which the operation times _t1 to _t8 of the motor and the ON operations of the first to fourth switches linked thereto are indicated by diagonal lines. 1...Main heater, 5...Automatic switch, 7,
8... Fixed contact, 9... First switch, 10...
...Motor, 13...Second switch, 14...Third switch, 15, 16...Fixed contacts.

Claims (1)

[Scope of utility model registration request] The first fixed contact 7 side of the automatic switch 5 is turned on manually, and the switch is turned on and off in conjunction with the motor 10.
The series circuit of the operating first switch 9 and the main heater 1 is connected to a power source, and the second fixed contact 8 side of the automatic switch 5 and the second switch that operates ON-OFF in conjunction with the motor 10 are connected to the power supply. A series circuit with the switch 13 is connected in parallel with the first switch 9,
and a third switch which operates in conjunction with the first fixed contact 7 side of the automatic switch 5 and the motor 10.
The second fixed contact of the third switch 14 is connected to the first fixed contact 15 side of the switch 14, and also switches in conjunction with the second fixed contact 8 side of the automatic switch 5 and the motor 10. In a cooker in which a parallel circuit connected to the contact 16 side and a series circuit connected to the motor 10 are connected to the power source, the movable contact of the third switch 14 is connected to the first fixed contact 1.
5, the motor 10 turns the first switch 9 from ON to OFF for a set time after operating for a set time, and the movable contact of the third switch 14 switches to the second fixed switch. contact 16 and
When the switch is on, the motor 10 turns the second switch 13 from OFF to ON for a set time after the motor 10 has operated for a set time. A series circuit in which the movable contact 18 of the switch 17 is connected to the second fixed contact 8 of the automatic switch 5, the first fixed contact 19 and the heat retention indicator lamp 20 are connected, and the second fixed contact 21 and A cooking appliance characterized in that a parallel circuit including a reheating indicator lamp 22 and a series circuit including a protective resistor 23 are connected to a power source.