JPS6313693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric rice cooker configured to selectively reduce the power consumption of a rice cooking heater and to adjust the degree of burntness of cooked rice according to preference.

Embodiments of the present invention will be described below based on the drawings.
In Figures 1 and 2, 1 is a commercial power supply, 2 is a rice cooker heater, 3 is a heat-retaining heater installed in the lid of the rice cooker, 4 is a heat-retaining heater installed in the body of the rice cooker, and 5 is a heat-retaining heater. A thermal reed switch connected in series to the heater 4, 6 a heat retention lamp connected in parallel to the heat retention heaters 3 and 4 for notifying the rice cooking operation, and 7 a rice cooker connected in parallel to the rice cooking heater 2 for notifying the rice cooking operation. A lamp 8 is a switch connected in series to the heat-retaining heaters 3 and 4. A switch 9 is connected in parallel to the switch 8. A lamp 10 detects the completion temperature of the rice, that is, the dry-up temperature, and opens the rice cooker heater 2. 11 is a diode connected in series with the bottom thermostat 10 as a means to reduce the power consumption of the rice cooking heater 2; 12 and 13 are diodes 1
1. A rice cooking selector switch which is used as a selection switch to select a switch 15 which will be described later, depending on the amount of rice to be cooked and preference; 14 is a switch for controlling the operation of the diode 11 connected in parallel to the diode 11;
Reference numeral 15 denotes a switch for controlling the operation of the rice cooking heater 2, which is connected between the switch 9 and a parallel circuit consisting of the diode 11, the switch 14, and the rice cooking changeover switch 13, and acts as a means for reducing power consumption similarly to the diode 11. Reference numeral 16 is a lid thermostat which serves as a detection element for detecting the boiling temperature of the cooked rice and indirectly detects the boiling of the cooked rice by detecting the lid temperature, and is closed at approximately 87°C. 17 starts operating when the lid thermostat 16 is closed, and the diode 11 and switch 1 are activated by the rice cooking selector switches 12 and 13.
As a timer element that controls the operation of the diode 11 via the switch 14 after operating for a predetermined set time when 5 is selected, and also controls the opening and closing of switches 8 and 9 at predetermined set times to stop the operation of the rice cooking heater 2 and start the heat-retaining operation. 18 is a steaming lamp for notifying the steaming operation, and 19 is a rice cooking knob.

The operation of an electric rice cooker with such a configuration is shown in FIG.
This will be explained with reference to B and C.

For example, if the amount of rice to be cooked is relatively large and you want to make the degree of browning darker, the rice cooking operation will be as shown in Fig. 3A. First, set the rice cooking selector switches 12 and 13 to position a, and set the rice cooking knob 19 to "cooking". . This operation causes the rice cooking switch 12, 13 to
are both closed, short-circuiting the switch 15 and diode 11, the switch is closed, and the switch 8 is opened, so the rice cooker heater 2 is connected to the commercial power supply 1 via the switch 9, the rice cooker selector switch 12, and the bottom thermostat 10. Once connected, full waves will flow and a strong fire will begin to operate. This operation causes the temperature of the cooked rice to rise, and when it reaches the boiling point, the lid thermostat 16 closes and the timer motor 17 starts operating. When a predetermined set time t ₂ (this time t ₂ is set to end within the boiling state regardless of the amount of cooked rice) has elapsed, the switch 14 opens.
Since the rice cooking switch 12 is in the closed state, the rice cooking heater 2 continues to operate with high heat, and high heat heating is continued. Then, when the water contained in the rice to be cooked is almost exhausted, the bottom wall of the pot rises rapidly and reaches the dry-up temperature, so the bottom thermostat 10 is opened and the electricity to the rice cooking heater 2 is cut off. A predetermined time t ₁ after the timer motor 17 starts operating (this time t ₁ is determined by the bottom thermostat 1 regardless of the amount of rice being cooked)
(It is set to be within the time between when 0 opens and when it closes again).
5 is opened, and when a predetermined set time _t4 elapses, the switch 15 is closed by the timer motor 17 for a predetermined set time T (approximately 1 minute), but within the predetermined set time _t4 , the thermostat 10 is closed again. Since the rice cooking heater 2 is closed, the rice cooking heater 2 is again brought into a high flame state for a time longer than the predetermined set time T (approximately 2 to 3
Double cooking is carried out for a period of 1 minute). When the dry-up temperature is reached again, the bottom thermostat 10 is opened again, cutting off the electricity to the rice cooking heater 2. Furthermore, when the predetermined set time _t3 has elapsed, the timer motor 17 is stopped, and the switch 9 is opened and the switch is turned off. 8 is closed, the heat generating operation of the rice cooking heater 2 is stopped regardless of whether the bottom thermostat 10 is opened or closed, and the heat keeping operation is started. In this way, double-cooking is performed under high heat and for a long time, so even if a large amount of rice is cooked, it is possible to increase the degree of burntness.

On the other hand, when the amount of rice to be cooked is relatively large and the degree of burntness is to be reduced, the rice cooking operation is as shown in FIG. 3B, and the rice cooking changeover switches 12 and 13 are first set to position b. This opens the rice cooking switch 12 and closes the rice cooking switch 13, so the rice cooking heater 2 is connected to the commercial power supply 1 via the switches 9, 15, the rice cooking switch 13, and the bottom thermostat 10.
connected to it and a strong flame ensues. When the boiling point is reached, the timer motor 17 starts operating and the switch ₁₄ is opened after a predetermined set time t2 has elapsed, but since the rice cooking selector switch 13 is in the closed state, the rice cooking heater 3 is turned on the high heat as above. Continue operation.
When the rice to be cooked reaches the dry-up temperature, the bottom thermostat 10 is opened and the electricity to the rice cooking heater 2 is cut off, and a predetermined set time _t1 has elapsed, the switch 15 is turned on.
is opened, so even if the bottom thermostat 10 closes again within the predetermined set time _t4 , the rice cooking heater 2 is not energized, and after the predetermined set time _t4 has elapsed, the switch 15 closes and the rice cooking heater 2 is closed again. will be cooked twice over high heat. And since this double cooking on high heat is done only for a predetermined set time T,
Compared to the above, the twice-cooking time is shorter, and the result is a relatively light burn. When the predetermined set time _t3 has elapsed, the timer motor 17 turns on the switch 9.
When the switch 8 is opened, the switch 8 is closed, and the rice cooking operation is completed and the heat keeping operation is started.

When the amount of rice to be cooked is small, the rice cooking operation is as shown in FIG.
13 to position C. As a result, the rice cooking selector switches 12 and 13 are opened, and the rice cooking heater 2 is connected to the commercial power source 1 via the switches 9, 15, 14 and the bottom thermostat 10, and the heat is turned on. When the temperature of the cooked rice rises and reaches the boiling point, the lid thermostat 16 closes and the timer motor 17 is activated.
is activated, and this timer motor 17 runs for a predetermined set time.
When _t2 is activated, the switch 14 opens, so the rice cooker heater 2 is connected to the commercial power supply 1 via the diode 11, and a half wave of the commercial power supply 1 is applied to the rice cooker heater 2, and the power consumption of the rice cooker heater 2 is halved. becomes. In this state, when the dry-up temperature is reached, the bottom thermostat 10 opens and the electricity to the rice cooking heater 2 is cut off.Furthermore, when the predetermined set time _t1 has elapsed, the switch 15 is opened, so that the bottom thermostat is turned off within the predetermined set time _t4 . Even if the switch 10 is closed again, the rice cooking heater 2 will not start heating as long as the switch 15 is open, and the rice cooking heater 2 will not start heating again until the switch 15 is closed again after the predetermined set time _t4 has elapsed. Electricity is applied, and this energization time, ie, the double cooking time, becomes a predetermined set time T. Furthermore, when the predetermined set time _t3 has elapsed, switch 9
When the switch 8 is opened, the switch 8 is closed and the heat retention operation is started. In this way, when a small amount of rice is to be cooked, the heat of the rice cooking heater 2 is weakened, and the second cooking time is set to a relatively short time, so that the rice can be cooked properly.

In the above embodiment, the predetermined set times t ₁ to _{t 4} and T are determined based on experimental values.

Also, it goes without saying that the degree of scorching can be changed in the case of a small amount of rice to be cooked as well as in the case of a large amount of rice to be cooked.

As explained above, according to the present invention, it is possible to select the degree of burnt rice according to the amount of cooked rice or preference using switches and timer elements without using an expensive device such as a microcomputer. We can provide a practical electric rice cooker that can cook rice according to your needs.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram of an electric rice cooker that is an embodiment of the present invention, Fig. 2 is a front view of the operating section of the same rice cooker, and Figs. 3 A, B, and C are rice cooking characteristics diagrams of the above control circuit, respectively. shows. 2...Rice cooking heater, 11...Diode, 12,1
3...Rice cooking selection switch, 14,15...Switch,
16...Lid thermostat, 17...Timer motor.

Claims (1)

[Claims] 1. A rice cooking motor, a detection element for detecting boiling of the cooked rice heated by the rice cooking heater, a means for reducing the power consumption of the rice cooking heater, and a selection switch for selecting the means for reducing the power consumption. , a timer element that starts operating upon receiving a boiling detection signal from the detection element, and controls the operation of the means for reducing power consumption after operating for a predetermined set time when the selection switch selects the means for reducing power consumption; An electric rice cooker characterized by being equipped with.