JPS6360664B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat-retaining rice cooker for cooking rice and keeping it warm.

Structure of a conventional example and its problems In a conventional rice cooker that also serves as a heat-retainer, the rice heater has one heating element. For this reason, large-capacity type heat-retaining rice cookers have a disadvantage in that the temperature distribution on the rice cooking heater is poor, resulting in uneven cooking of rice. In addition, since the rice cooking capacity is large, if you want to cook delicious rice, you will need a high-power rice cooker heater, which will cause the temperature balance between the lid heater, warm heater, and rice cooker to be disrupted during keeping warm, and the resistance value of the rice cooker will be lower than that of other heaters. Because the rice cooker was smaller than necessary, the temperature of the rice cooker became low, and the rice at the bottom of the pot became sticky due to dew.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to maintain the balance of each heater during heat retention.

Structure of the Invention The present invention cooks rice using a rice heater in which a plurality of heating elements are cast so that the temperature distribution of the rice heater is improved during rice cooking, and when keeping the rice warm, some of the heating elements and the heat insulation By controlling the energization of the heater and the lid heater using a temperature control element, it is possible to keep rice well warm without disturbing the temperature balance of the heat retention heater, lid heater, and rice cooking heater.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a main body, and a lid 2 is provided to cover the upper opening so as to be openable and closable. 3 is an inner pot that is detachably housed in the main body 1, and 4 is an inner lid that is detachably attached to the lower surface of the lid 2. 5 is a rice cooking heater arranged at the inner bottom of the main body 1;
For example, two heating elements 6 and 7 are integrally cast. A rice cooking switch 8 is provided through the center of the rice cooking heater 5, and is turned off when it senses a rise in temperature at the bottom of the inner pot 3. Reference numeral 9 denotes a heat insulating heater provided on the inner surface of the main body 1, and a temperature sensing element 10 is located nearby.
is located. 11 is a lid heater provided on the lower surface of the outer lid 2.

As shown in FIG. 2, the circuit configuration is such that a series circuit of the heating element 6 located inside of the heating elements 6 and 7 and the first contact 8a of the rice cooking switch 8 is connected to the power supply 12. Further, a series circuit of the heating element 7 and the second contact 8b of the rice cooking switch 8 is connected in parallel to this series circuit. Furthermore, a parallel circuit of the heat retention heater 9 and the lid heater 11 and a series circuit of the bidirectional three-terminal control rectifier element 13 are connected in parallel to the second contact point 8b. Further, a temperature sensing element 1 is connected between the gate electrode of the bidirectional three-terminal control rectifying element 13 and the first main electrode.
0 and a series circuit of protection resistor 14 are connected.

In the above configuration, when cooking rice, the rice cooking switch 8
The first contact 8a and the second contact 8b are closed, and the heating elements 6 and 7 are energized. heating element 6,
When the rice in the inner pot 3 is cooked due to the heat generated by the rice cooker 7, the temperature at the bottom of the inner pot 3 rises rapidly, and the rice cooking switch 8 senses this, opens the first contact 8a and the second contact 8b, and shifts to the heat retention state. do. When the heat retaining state is reached, the gate pole of the bidirectional three-terminal control rectifying element 13 is controlled by turning the temperature sensing element 10 ON and OFF, and as a result, the outer heating element 7, the heat retaining heater 9, and the lid heater 11 are energized. , to keep the rice at a constant temperature.

Effects of the Invention As is clear from the above description, according to the present invention, the resistance value of the heating element of the rice cooking heater can be set to an optimal value during rice cooking and keeping warm, and the temperature distribution during cooking and temperature distribution during keeping warm. can be brought into the desired state, and its value is great.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a heat-retaining rice cooker showing an embodiment of the present invention, and FIG. 2 is an electric circuit diagram thereof. 1...Main body, 2...Outer lid, 3...Inner pot, 5...
Rice cooking heater, 6, 7... heating element, 9... heat retention heater, 11... lid heater.

Claims (1)

[Claims] 1. A lid that can be opened and closed on the main body, an inner pot that is removably housed inside the main body, a rice cooking heater that has multiple heating elements installed on the inner bottom of the main body, and a heat retainer that is installed on the inner surface of the main body. It is equipped with a heater and a lid heater provided on the bottom surface of the lid, and when cooking rice, all of the plurality of heating elements are energized, and when keeping rice warm, some of the heating elements, the warming heater, and the lid heater are energized. A heat-retaining rice cooker.