JPH01236018A - Electric rice cooker - Google Patents

Abstract

PURPOSE:To uniform the temperature rise of rice in an inner pot and to execute a satisfactory rice cooking performance to cook a delicious rice by providing at least one rice cooking heater in the upper part of the inner pot. CONSTITUTION:A second rice cooking heater 12 is fitted on the upper surface of an inner cover 9, and a far infrared radiation radiant film by a ceramic coating material is executed on the lower surface. A 13 is a radiating plate fitted to a cover 7, and the second rice cooking heater 12 is guided through a packing 14 into the cover 7. The rice and water are put in an inner pot 5, and the inner pot 5 is heated by a first rice cooking heater 4 and the second rice cooking heater 12. When the water in the inner pot 5 runs short, a current flow to the second rice cooking heater 12 is stopped, and next, when a temperature sensor 6 detects a cooking finish temperature 130 deg.C, the current flow to the first rice cooking heater 4 is also stopped, and the rice cooking is completed. The rice in the inner pot 5 is heated from upper and lower directions, a heating efficiency improvement by the far infrared radiation radiant film on the inner pot lower surface is also executed, the rice temperature is made into a temperature distribution to be approximately uniform up and down, and the rice can be made into the satisfactory rice without a cooking nonuniformity.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electric rice cooker for home use.

Conventional technology The configuration of a conventional electric rice cooker is shown in FIGS. 6 and 7.

In the figure, 21 is a main body, 22 is a main body ring, and 23 is an inner container, to which a rice cooking heater 24 is attached.

25 is removably stored inside the main body 21, and the inner parts are 1 and 26.
One of these is one! 25 and detects the temperature. A lid 27 is attached to the main body 21 by a hinge pin 28 so as to be openable and closable. 29 is Bush 30
This is an inner lid that is detachably attached to a fixing bolt 61. 32 is a power source, and 36 is a control unit that controls power supply to the rice cooking heater 24.

The operation of the conventional example having the above configuration will be explained.

Water is poured into the inner pot 25 and heated with the rice cooking heater 24.

The inside is '! When the water in the rice cooker runs out and the temperature sensor 26 detects the finished cooking temperature of 130° C., the control unit 66 stops energizing the rice heater 24 and completes the rice cooking. Figure 8 shows the input power of the rice cooking heater and the temperature characteristics of each part.
The temperature at the upper part of pronation is the temperature at the lower part of the pronation.

Problems to be Solved by the Invention According to the above structure, the temperature at the lower part of the inner pot 25 rises faster than the temperature port at the upper part, and the lower part of the inner pot 25 is exposed to high temperature for a longer time, causing the rice grains to crumble and break. The drawback was that the rice ended up being watery.

Means for Solving the Problem 3P The present invention has been made to eliminate the above-mentioned drawbacks of the conventional rice cooker, and includes at least one rice cooking heater also provided in the upper part of the inner pot.

Function The present invention is configured as described above, so that the rice cooking heater provided at the upper part of the inner pot has the effect of heating the cooked rice in the inner pot evenly by heating from the upper part of the inner pot.

Example An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a front sectional view of an electric rice cooker according to an embodiment of the present invention, Fig. 2 is a sectional view of its main parts, Fig. 3 is its circuit configuration diagram, and Fig. 4 is its rice cooking characteristic diagram. .

In the figure, 1 is the main body, 2 is the main body ring, and the filter is the inner container. 4 is a first rice cooking heater attached to the inner container 6. Reference numeral 5 denotes a removably housed inner pot, and 6 is a temperature sensor attached so as to come into contact with the inner pot 5. Reference numeral 7 denotes a lid attached to the main body 1 by a hinge pin 8 so as to be openable and closable. 9 is removably attached to the fixing bolt 11 by a bushing 10, and the inside is one! , 5 is a uchili that is placed on top. A second rice cooking heater 12 is attached to the top surface of the lid 9.

The bottom surface is coated with a far-infrared ray-emitting film made of ceramic coating material. 13 is a heat dissipation plate attached to the lid 7, which guides the second rice cooking heater 12 into the lid 7 through the heat sink 14, and connects the detachable terminal 12a to the power supply terminal 15 in a detachable manner. 16 is a power supply, and 17 is a control unit that receives input from the temperature sensor 6 and controls power supply to the rice cooking heaters 4 and 12.

The operation of this embodiment having the above configuration will be explained.

Put rice and water in the inner pot 5 and turn the first rice cooking heater 4 and the second
The inner pot 5 is heated by the rice cooking heater 12. When the water in the inner pot 5 runs out, the power to the second rice cooking heater 12 is turned off, and then the temperature sensor 6 detects the cooked rice temperature 16.
When 0° C. is detected, power supply to the first rice cooking heater 4 is also stopped to complete the rice cooking.

Also, as shown in Fig. 4, the temperature characteristics of each part at that time are the temperature A of the temperature sensor 6, the upper temperature P B within -1:5, and the lower temperature C.
The electric power A is applied to the second rice cooking heater 12, and the electric power B is applied to the second rice cooking heater 12. As can be seen from the figure, when rice is cooked as described above, the rice in the inner pot 5 is heated from above and below, and the heating efficiency is improved by the far-infrared radiation film on the bottom surface of the inner pot, so that the rice temperature is approximately even between the top and bottom. The temperature distribution is uniform, and it is possible to obtain good cooked rice without uneven cooking.

Note that FIG. 5 is a front sectional view of an electric rice cooker according to another embodiment, and is an example in which the second rice cooking heater 12 is mounted on the heat sink 13, and the lower surface of the heat sink 16 and the inner lid are The upper and lower surfaces of 9 are formed with a far-infrared emitting film. This example also has the same effect as the previous example.

Effects of the Invention According to the present invention, since at least one rice cooking heater is provided at the upper part of the inner pot, the temperature rise of the cooked rice in the inner pot becomes uniform, resulting in delicious cooked rice and good rice cooking performance. There is an effect that can be obtained.

P

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of an electric rice cooker showing an embodiment of the present invention, Fig. 2 is a sectional view of its main parts, Fig. 6 is its circuit configuration diagram, Fig. 4 is its rice cooking characteristic diagram, and Fig. 5 Figure 6 is a front sectional view of an electric rice cooker showing another embodiment of the present invention, Figure 6 is a front sectional view of a conventional electric rice cooker, Figure 7 is its circuit configuration diagram, and Figure 8 is its rice cooking characteristics. It is a diagram. 5. Inner pot, 12.-Rice cooking heater. ■Applicant Hitachi Thermal Appliances Co., Ltd.

Claims (1)

[Claims] In an electric rice cooker having an inner pot detachably stored inside the main body and a rice cooking heater for heating the inner pot, a plurality of the rice cooking heaters are provided, and at least one of the rice cooking heaters (12) is installed inside the rice cooker. An electric rice cooker characterized by being installed on the top of the rice cooker (5).