JPS63290521A - 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 Field of Industrial Application The present invention relates to a rice cooker for home use.

BACKGROUND ART Conventionally, this type of rice cooker has had a structure as shown in FIG. In FIG. 4, 1 is a pot, 2 is a casting heater for placing and heating the pot 1, 8 is a protective frame that houses the pot 1, 4 is a side heater provided on the side of the protective frame 8, and 6 is a protective frame 8 A side thermal reed switch installed on the side of the unit controls the heat retention temperature to be constant. 6 is an outer lid that covers the upper opening of the pot l, 7 is a lid heater provided inside the outer lid 6, and 8 is an outer lid 6.
A lid thermal reed switch installed inside the pot 1 detects when the water inside the pot 1 is about to rise. 9 is cast-in heater 2
A porridge thermostat 10 provided on the lower surface of the heater 2 is a center thermostat that comes into contact with the bottom surface of the pot 1, and is activated when the water inside the pot 1 runs out to detect the completion of rice cooking.

The operation of the above configuration will be explained with reference to the circuit diagram in FIG. In the case of cooking rice, when the selector switch 11 is switched to the a side and the center thermostat 1G is turned on, the cast-in heater 2 is energized. When the rice is cooked and the water inside the pot 1 disappears and the temperature at the bottom of the pot rises, the center thermostat 10 is turned off and switched to the heat retention circuit. The power consumption of the casting heater 2 during this rice cooking is 680W.

The heat retention circuit is composed of a three-sided heating circuit consisting of a series circuit of a cast-in heater 2, a side heater 4, and a lid heater 7 connected in parallel.
The FF control keeps the rice at a constant temperature. The power consumption of each heater during heating is 10W for casting heater 2, 45W for side heater 4, and 24V for lid heater 7.
) Total 79W tele.

In the case of cooking rice porridge, switch the changeover switch 11 to the b side and turn on the center thermostat 10, and the relay 12 will operate through the lid thermal reed switch 8.
The relay contact 18 closes and the flow is passed through the casting heater 2 (power consumption: 680 W). When the temperature of the porridge reaches approximately 90℃, the lid thermal reed switch 8 turns OFF L/, relay 12 opens the relay contact 18, and turns OFF at 100℃.
The porridge thermostat 9, which is set to F, allows the flow to the casting heater 2 1! (power 680 W) was controlled to ON-OFF as shown in FIG. 6(a), and the temperature of the porridge was raised and maintained at 100° C. as shown in FIG. 6(b) for simmering. Here, the OF of the lid thermal reed switch 8 is
If the time of F is set to a time when the porridge temperature is too low, it will take time to reach 1G0℃ due to the subsequent electricity supply, and there will be a problem that the cooking time will become longer.
If the temperature is set around 0℃, there is a problem that the sticky liquid will boil over from the outer lid 6, so the temperature of the rice porridge will be about 90℃.
It is set to work when. Also, the reason for ON/OFF control with high power consumption of 680W is to shorten the time it takes to raise the porridge temperature from about 90℃ to Zoo''C, and to reduce the temperature of the porridge by pouring water. This is to quickly return the temperature to 100''C.

Problems to be Solved by the Invention In the conventional configuration as described above, when cooking porridge, the porridge thermostat requires 680W of electricity, which is the same as when cooking rice.
Due to N/OFF control, as the simmering time goes by, the porridge becomes more sticky, causing the porridge to stick to the bottom of the pot, and the sticky liquid to spill out of the outer lid. Ta.

The present invention solves the above-mentioned conventional problems, and maintains the conventional heating performance of rice porridge, and also prevents rice porridge from sticking to the bottom of the pot and prevents sticky liquid from boiling over from the outer lid. The purpose is to provide a rice cooker that can.

Means for Solving the Problems In order to solve the above problems, the rice cooker of the present invention includes a cast-in heater for placing and heating the pot, and covering the sides of the protective frame that houses the pot and the opening at the top of the pot. A side heater and a lid heater each provided on the outer lid and forming part of a heat retention circuit when cooking rice, a lid temperature switch provided on the outer lid, and a porridge thermostat provided on the cast heater, Until the lid temperature switch is turned off, the rice cooking circuit is configured by the casting heater, and after the lid temperature switch is turned off, the rice porridge thermostat controls the rice cooking circuit on and off, and when the rice cooking circuit is off, the rice cooking circuit is A porridge circuit is constituted by a heater, the side heater, and the lid heater.

Effect With the above configuration, when the porridge thermostat is turned off when the porridge is boiled after the lid temperature switch is turned off, the three-sided heating circuit, which is the same as the heat retention circuit when cooking rice, consisting of the casting heater, side heater, and lid heater, operates as the porridge circuit. However, as a result of the temperature drop of the porridge thermostat becoming more gradual, even if the porridge thermostat is a cast-in heater that uses the same high power of 680 W as when cooking rice at 08:00, its OFF time becomes longer and the bottom of the pot when simmering with the cast-in heater increases. Addition from ? The amount of Affl is reduced compared to the conventional one, which prevents the porridge from sticking to the bottom of the pot and the porridge from boiling over from the outer lid.

In addition, when the porridge thermostat is turned off, 300 heating circuits operate, increasing the total power consumption, so the temperature increase characteristic relative to the set temperature of porridge can be maintained at the conventional level. Furthermore, the number of parts can be reduced by using the porridge circuit as the heating circuit for cooking rice.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a rice cooker showing one embodiment of the present invention. In FIG. 2, 21 is a pot, 22 is a heater for placing and heating the pot 21, 23 is a protective frame that houses the pot 21, 24 is a side heater provided on the side of the protective frame 28, and 25 is a protective frame. A side thermal reed switch installed on the side of 28 controls the heat retention temperature. 26 is an outer lid that covers the upper opening of the pot 21; 27 is a lid heater provided inside the outer lid 26; 28 is a lid thermal reed switch provided inside the outer lid 26; I am sensing that it is on the verge.

29 is a porridge thermostat installed on the bottom surface of the cast-in heater 22, and 80 is a center thermostat installed in the center of the cast-in heater 22 and in contact with the bottom of the pot 21, which operates when the water inside the pot 21 runs out and detects the completion of rice cooking. are doing.

The operation of the above configuration will be explained with reference to the circuit diagram of FIG. For rice cooking, switch the selector switch 81 to side a and turn on the center thermostat 80.
The casting heater 22 is energized. When the rice is cooked and the water inside the pot 21 disappears and the temperature at the bottom of the pot rises, the center thermostat 30 is turned off and switched to the heat retention circuit.

The power consumption of the casting heater 22 during this rice cooking is 680W. The heat retention circuit is composed of an 8-sided heating circuit consisting of a series circuit of a cast-in heater 22, a side heater 24, and a lid heater 27 connected in parallel. It keeps the temperature constant and keeps warm. At this time, the power consumption of each heater is IOW for the casting heater 22, 46W for the side heater 24, and 24W for the lid heater 27, for a total of 79W.

In the case of cooking rice porridge, switch the changeover switch 81 to the b side and turn on the center thermostat 80, and the relay 82 will operate through the lid thermal reed switch 28.
The relay contact 88 closes and the cast heater 22#ζ is turned on (power consumption: 680 W), forming a rice porridge cooking circuit. When the temperature of the porridge reaches approximately 90°C, the lid thermal reed switch 28 turns OFF L/, the relay 82 opens the relay contact 38, and the porridge thermostat 29, which is set to turn OFF at 100°C, turns on the casting heater 22. is turned on as shown in Figure 8(a).
OFF control, and when the porridge thermostat 29 is OFF, a porridge circuit equivalent to a heat retention circuit consisting of an eight-sided heating circuit consisting of the cast-in heater 22, the side heater 24, and the lid heater 27 is configured, and is energized at 79W to control the porridge temperature. 8. As shown in Figure 8 (b), the temperature is maintained at 100°C and simmered.

Next, the cover turn and temperature rise characteristics of porridge during cooking porridge shown in FIGS. 8(a) and 8(b) will be explained in comparison with those of the conventional example shown in FIGS. 6(a) and 6(b). When the porridge thermostat 29 is turned OFF during porridge cooking after the lid thermal reed switch 28 is turned OFF, the heat retention circuit consisting of the casting heater 22, the side heater 24, and the lid heater 27 is activated.
The surface heating circuit operates as a porridge circuit, and the humidity at the porridge thermostat 29 gradually decreases, resulting in the temperature shown in Fig. 8 (
The OFF time t1 of the casting heater 22 shown in a) is the sixth
It is longer than the conventional t shown in the figure, and the amount of heating from the bottom of the pot by the casting heater 22 is less than that of the conventional one. No more boiling over.

Also, since the total power consumption increases, the time t for raising the porridge temperature from 90°C to 100°C is shorter than the conventional time t shown in Fig. 6(b), as shown in Fig. 8(1)). It can be made shorter. As a result, even when the temperature of the rice porridge drops due to water, etc.
The temperature can be returned to 0°C.

Effects of the Invention As described above, according to the present invention, the porridge thermostat is turned off during porridge boiling after the M temperature switch is turned off.
At F L/, the 8-sided heating circuit, which is the same as the heat retention circuit when cooking rice and consists of a cast-in heater, side heater, and lid heater, operates as a porridge circuit, and as a result, the temperature of the porridge thermostat decreases more slowly. The amount of heating from the bottom of the pot by the casting motor during simmering is reduced, preventing porridge from sticking to the bottom of the pot and porridge goo from boiling over from the outer lid, as well as increasing total power consumption. Temperature performance can be improved. Furthermore, by using the porridge circuit as the heat-retaining circuit when cooking rice, the number of parts can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a rice cooker according to an embodiment of the present invention, and FIG.
The figure is a longitudinal cross-sectional view of the same rice cooker, Figures 8(a) and 8(b) are diagrams showing the cover turn and the corresponding temperature rise characteristics of the rice porridge when cooking rice porridge in the same rice cooker, and Figure 4 is a diagram showing the conventional rice cooking method. A vertical cross-sectional view of the rice cooker, Figure 5 is a circuit diagram of the same rice cooker, Figure 6 (a) (b
) is the cover turn when cooking porridge in the same rice cooker and it ξζ
FIG. 22... Cast-in heater, 28... Protection frame, 24...
・Side heater, 26...outer lid, 27...lid heater,
28... Lid thermal reed switch (lid temperature switch), 29... Porridge thermostat, 81... Changeover switch, 82... Relay, 8B... Relay contact.

Claims (1)

[Claims] 1. A cast-in heater that heats the pot on which it is placed, and a side that forms part of the heat retention circuit when cooking rice, which is provided on the side of the protective frame that houses the pot and the outer lid that covers the top opening of the pot. It is equipped with a heater, a lid heater, a lid temperature switch provided on the outer lid, and a porridge thermostat provided on the cast-in heater, and until the lid temperature switch is turned off, the rice cooking circuit is configured by the cast-in heater, and the rice porridge thermostat is provided in the cast-in heater. After the lid temperature switch is turned off, the rice cooking circuit is controlled on and off by the rice porridge thermostat, and when the rice cooking circuit is off, the rice porridge circuit is constituted by the casting heater, the side heater, and the lid heater.