JPS584516A - Warmth preserving 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] The present invention relates to a heat-retaining rice cooker that improves the heating method when cooking rice, heats the rice in the pot from all around the top, sides, and bottom, and cooks the rice fluffy and delicious. The purpose is to

Conventionally, in heat-retaining rice cookers, when cooking rice, the rice is cooked using a rice-cooking heater at the bottom of the pot, and when keeping the rice warm, it is heated from all around using heaters on the top, sides, and bottom. The present invention attempts to uniformly heat the entire circumference by using the heaters on the top, side, and bottom surfaces even when cooking rice.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a body, and a protective frame 3 is provided inside with a heat insulating material 2 interposed therebetween. 4 is a rice cooking heater arranged at the inner bottom of the protective frame 3, on which the pot 5 is placed. Reference numeral 6 denotes a rice-cooking end sensing thermostat which extends through a through-hole in the center of the rice-cooking heater 4 and operates by sensing the temperature at the bottom of the pot 5, and this operation is transmitted to the rice-cooking lever 8 via a rod 7.

Reference numeral 9 denotes a rice cooking end detection switch that is opened and closed by rotation of the rice cooking lever 8. 1o is a temperature control circuit box, 11 is a rice cooking indicator lamp, and 11 is a heat retention indicator lamp. 12 is a side heater of the main body wrapped around the outer periphery of the protective frame 3, and 13 is a heat retention temperature sensor such as a thermal reed switch or thermistor attached to the outer surface of the protective frame 3. Reference numeral 14 denotes an outer cover that covers the upper surface of the main body, and an inner cover 16 is provided at the bottom of this outer cover 14 and serves as an upper surface heater.

The electrical circuit of the heat-retaining rice cooker having the above structure is as shown in FIG. 2, in which the rice cooking heater 4 and the rice cooking end detection switch 9 are connected in series. One end of a parallel circuit of a side heater 12 and a top heater 1 is connected to the connection point between the rice cooking heater 4 and the rice cooking end detection switch 9, and the other end of this parallel circuit is connected to a movable contact of a changeover switch 18. There is. One fixed contact 18b of this changeover switch 1B is a thyristor.

It is connected to one end of the rice cooking end detection switch 9 via a control element 19 such as a relay, and a series circuit of a heat retention temperature sensor 13 and a resistor 2o is connected between the gate electrode of this control element 19 and one main electrode. . Further, the other fixed contact 18c of the changeover switch 18 is connected to one end of the rice cooking heater 4.

Note that this changeover switch 18 is the rice cooking end detection switch 9.
When the rice-cooking end detection switch 9 is closed, the movable contact 18a connects to the other fixed contact 18c, and when the rice-cooking end detection switch 9 is open, the movable contact 18a connects to one of the fixed contacts 18c. It is configured to be connected to the fixed contact 18b.

In the above configuration, the rice cooking end detection switch is closed during rice cooking, and the rice cooking heater 4, side heater 12, and top heater 17 are connected in parallel, and the rice in the pot 6 is heated on the top, side,
Heating will occur from three directions on the bottom surface, that is, from the entire surface.

Furthermore, when the pot temperature rises and the rice cooking ends, the rice cooking end sensing thermostat 6 operates, the rice cooking end sensing switch 9 opens, and the parallel circuit of the side heater 12 and the top heater 17 is connected in series to the rice cooking heater 4. That will happen.

Now, assuming that the power source is 1 oov, the rice cooking heater 4 is 16Ω, the side heater 12 is 50Ω, the top heater 17 is 400Ω, and the control element 8 is SCR, the rice cooking special power is 625W from the rice cooking heater 4, 200W from the side heater 12, and the top 25W from heater 17, totaling 5soW, when keeping warm,
Approximately 21.9 W is output from the rice cooker heater 4, approximately 64 W is output from the side heater 12, and approximately 6.8 W is output from each top heater 7, resulting in a total of L2 to keep the rice warm. The conventional circuit diagram is as shown in Figure 3, and when compared with Figure 2,
There is no lead wire or switch 18. In this case, when calculating each power consumption under the same conditions as above, 626 W is consumed by the rice cooking heater alone during rice cooking. The power consumption during heat retention is the same as that of this embodiment. This comparison is shown in Table 1.

Table 1 As described above, according to the present invention, when cooking rice, heating is performed not only from the bottom rice cooking heater, but also from the side heaters and the top heater with relatively high power, so that ideal rice heating can be achieved. This has always been a problem for us. This greatly improves the difference in the softness, moisture content, and fluffiness of rice between the upper and lower parts of the pot. Moreover, since the power consumption balance of each heater is not changed during heat retention, good heat retention can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a heat-retaining rice cooker according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram thereof, and FIG. 3 is an electric circuit diagram of a conventional heat-retaining rice cooker. 4... Rice cooking heater, 5... Pot, 9...
...Rice cooking end detection switch, 12...Side heater, 17...Top heater, 18...
・Choice switch.

Claims (1)

[Claims] A rice cooking heater at the bottom of the pot and a rice cooking end detection switch that senses the end of cooking and closes are connected in series, and one end of the parallel circuit between the side heater of the main body and the top heater of the main body is connected to the rice cooking end sensor at the bottom of the pot. This rice cooker is connected to a connection point of a switch, a changeover switch is provided at the other end, and the other end of a rice cooking heater at the bottom of the pot is connected to the other end of a rice cooking end detection switch.