JPS6025128B2 - electric rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric rice cooker, and in particular, it is an object of the present invention to provide an electric rice cooker with a simple configuration that allows users to arbitrarily select and implement additional cooking according to their preferences.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is a cylindrical main body, and an outer steel 3 is suspended and supported via a protective frame 2 made of resin provided at the upper end.

4 is a heating plate into which a rice cooking heater 5 is cast, which is arranged at the inner bottom of the outer pot 3, and an inner pot 6 is attached thereto.

A completed lid body 7 is pivotally supported on one side of the protective frame 2, and is provided with an outer lid 8 that covers the closed opening of the outer pot 3 and an inner lid 9 that covers the closed opening of the inner pot 6.

It is a heat-responsive rhombus that penetrates the heating plate 4 and contacts the bottom of the inner pot 6, and the heat-responsive device 101 moves to rotate the rice-cooking switch lever 11, opening and closing the rice-cooking switch 12.

13 is a timer, and 14 is a cam driven by the timer 13. The rope circuit of the electric rice cooker having the above-mentioned basic structure will be explained below.

In FIG. 2, 16 is an AC power source, one end of which is connected to the movable contact 16a of the changeover switch 16 via the timer 13, and the other end connected to the movable contact 12a of the rice cooking switch 12.

In addition, the normally closed contact 16b and the normally open contact 16 of the changeover switch 16
c are connected to the normally open contact 12b and the normally closed contact 12c of the rice cooking switch 12, respectively. Furthermore, the AC power supply 15 includes a rice cooking heater 5, an automatic opening/closing switch 17 for pre-cooking, an automatic opening/closing switch 18 for cooking, and a manual opening/closing switch 1 for cooking.
A series circuit of 9 is connected to a series circuit of a rice cooking indicator lamp 20, a resistor 21, and a heat retention control circuit 22. The normally open contact 12b of the rice cooking switch 12 is commonly connected to the connection point between the pre-cooking automatic opening/closing switch 17 and the pre-cooking automatic opening/closing switch 18, and the connection point between the resistor 21 and the heat retention control circuit 22. 23 is a manual opening/closing switch for pre-cooking, which is connected in parallel to the automatic opening/closing switch 17 for pre-cooking.

A cam 14 is driven by the timer 13 and operates a changeover switch 16, an automatic opening/closing switch 17 for front blowing, and an automatic opening/closing switch 18 for cooking.

Next, the operation of the above circuit configuration will be sequentially explained according to the rice cooking process.

First, washed rice and water are put into the inner pot 6, and the inner pot 6 is stored in the outer pot 3.

Thereafter, by pressing the rice cooking switch lever 11 downward, the thermally responsive device 10 is brought into a state capable of detecting the inner steel temperature, and the movable contact 12a of the rice cooking switch 12 is opened to the normally open contact 12b. At this time, the movable contact 16a of the cut-off switch 16 is closed as the normally open contact 16M, and the timer 13
The timer 13 causes the cam 14 to start driving. The automatic opening/closing switch 11 for pre-cooking is open, and the rice cooking heater 5 is opened and the rice cooking starts.

After a certain period of time, for example about 3 minutes, from the start of this rice cooking, the inner pot temperature rises to about 40°C, but at this point the open/close switch 17 is opened by the action of the cam 14, After a certain period of time, for example, about 7 minutes, after the opening/closing switch 17 is opened, the opening/closing switch 17 is similarly opened again by the action of the cam 14, and the rice cooking heater 5 is re-energized and the inner pot is turned off. The temperature starts to rise again.While this on/off switch 17 is open, the rice in the inner pot 6 is submerged in water at about 40°C, and the rice in the inner pot 6 is sufficiently hydrated. The timer is not limited to a clock type, and a thermistor timer, a circuit disconnection timer using a reversing thermostat, or a damper type timer may be used.Now, the open/close switch 22 is closed again, and the electricity is turned on to the rice cooking heater 5. Once connected, the temperature of the inner steel continues to rise, and at the end of rice cooking, the thermal overlay device 10 senses the inner steel temperature, presses the tip of the rice cooking switch lever 11 downward, and changes the movable contact 12a of the rice cooking switch 12 to a normally closed contact. Closed at 12c.

At this point, the rice cooking process is completed, and the cooking process will be explained below.

The timer 13 is connected to the rice cooking switch 12 and the changeover switch 1.
6, the cam 14 starts driving again, and after a certain period of time, for example about 3 to 10 minutes, after the rice cooking heater 5 is turned off, the automatic opening/closing switch 18 for rice cooker starts operating the cam 14. The rice cooking heater 5 is re-energized via this on/off switch 18, the pre-cooking automatic on/off switch 17, and the pre-cooking manual on/off switch 19. After the rice cooking heater 5 is turned on again for a certain period of time, for example, 1 to 3 minutes, the cam 14 works to open the automatic opening/closing switch 18 for close cooking, and the movable contact 1 of the cut-off switch 16
6a is closed to the normally closed contact 16b, power to the rice cooking heater 5 is cut off, and cooking is completed. From now on, the heat retention control circuit 2
The voltage of the AC power supply 15 is applied to the series connection body of the rice cooker 2 and the rice cooking heater 5 to keep the rice warm. The rice cooking indicator lamp 24 is lit while the rice cooking heater 5 is energized, but when the heat retaining circuit 26 is energized, the rice cooking indicator lamp 24 is lit.
The applied voltage is low and it does not light up. Now, the rice cooking process in the case where pre-cooking and pre-cooking are performed is described above, but a case will be explained in which pre-cooking and pre-cooking are not performed due to the user's preference.

First, if pre-cooking is not to be performed, the pre-cook manual switch 23 is closed.

As a result, even if the automatic opening/closing switch 17 for pre-cooking is opened after a certain period of time after the start of rice cooking, electricity is continued to be supplied to the rice cooking heater 5, so the temperature of the inner pot does not stagnate at around 40 qo, and the temperature rises all at once. can be raised. Next, when cooking is not required, leave the manual open/close switch 19 for close cooking open, so that even if the automatic open/close switch 18 for cooking is closed, the rice cooking heater 5 will not be energized during cooking. Not done. As is clear from the above description, according to the present invention, the user can arbitrarily select and execute cooking according to the user's preference.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an electric rice cooker showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the same, Fig. 3 is a temperature-time characteristic diagram of the electric rice cooker, and Fig. 4 is the main part of the same. FIG. 2 is an energization program diagram. 5...Rice cooking heater, 10...Thermal response device, 12
... Rice cooking switch, 13 ... Timer, 14 ... Cam, 18 ... Automatic opening/closing switch for rice cooking, 19 ... Rice cooking Manual open/close switch. *1 Figure 4 Figure 2 Figure 3

Claims (1)

[Claims] 1. A rice cooking switch that is operated by a heat response device that senses and responds to the pot temperature at the end of rice cooking to cut off electricity to the rice cooking heater and start electricity to the timer, and a rice cooking switch that is connected in parallel to this rice cooking switch. It is equipped with a series connection body of an automatic opening/closing switch for additional cooking and a manual opening/closing switch for additional cooking, and a cam linked to a timer causes the automatic opening/closing switch for additional cooking to be activated after a certain period of time has elapsed after the power to the rice cooking heater is cut off. An electric rice cooker characterized by closing the door for a predetermined period of time.