JPS6124180Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a closed-type electric rice cooker, and has a heat dissipation plate mounting structure that can slow down the temperature drop after rice is cooked, thereby reducing the unevenness of the rice cooker. The purpose of the present invention is to provide an electric rice cooker that can cook delicious rice with sufficient quantity.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric rice cooker according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a main body case, and 2 denotes a lid body that covers the upper opening of the main body case 1 so as to be openable and closable.

The main body case 1 is composed of an inner case 3 forming its inner surface, an outer case 4 forming its outer surface, a bottom member 5, and a shoulder member 6 connecting the upper ends of the inner and outer cases 3, 4. The space is filled with a heat insulating material 7.

Inside the main case 1, a rice bowl 8 is placed along its opening edge 8a.
It is housed in a state where it is suspended from the shoulder portion 1a of the main body case 1 (specifically, the opening edge of the inner case 3) and is detachable. Reference numeral 9 denotes an inner lid attached to the lower surface of the lid body 2 to cover the opening of the rice bowl 8.

A sealed space 10 is formed between the inner case 3 and the rice bowl 8.

A hot plate 12 in which a rice cooking heater 11 is embedded is arranged at the inner bottom of the inner case 3 so as to be movable up and down.

The hot plate 12 is urged upward by a spring 13 and is pressed against the bottom surface of the rice bowl 8.

The mounting leg 14 of the hot plate 12 passes through the bottom of the inner case 3, and between the mounting leg 14 and the bottom of the inner case 3 is a disc that acts as a thermally responsive member for moving the hot plate 12 downward. A shaped bimetal 15 is interposed. Reference numeral 22 is a recess formed on the bottom surface of the inner case 3 for storing bimetallic material.

The bimetal 15 has a temperature t ₂ (≒
It curves downward at a temperature t ₁ (110 to 120°C) slightly lower than 140°C, and has the effect of separating the hot plate 12 from the bottom surface of the rice bowl 8.

In the drawings, reference numeral 16 is a center thermostat for controlling electricity supply to the rice cooking heater 11, 17 is a reflector, 18 is a switch lever, and 19 is a heat-retaining heater.

Next, the operation of the electric rice cooker of this embodiment will be explained with reference to FIGS. 1 to 3.

This electric rice cooker is used for both cooking and keeping the rice warm by using the heat-retaining heater 19 to keep the rice warm after the rice is cooked by the rice-cooking heater 11.

The rice cooker heater 11 is energized, the rice cooker 8 is heated by the hot plate 12, and the rice cooker 8 reaches a predetermined temperature _t1 (110~
120° C.), the bimetal 15 curves downward as shown in FIG. 3, separating the hot plate 12 from the bottom surface of the rice bowl 8. At this time, a gap S is formed between the hot plate 12 and the rice bowl 8, and the air in the gap S is heated by the rice cooker heater 11 and the temperature rises rapidly, causing the area around the rice bowl 8 to rise. Convection occurs with the air in the sealed space 10, and heat is stored in the sealed space 10. Therefore, as shown in FIG. 4, the temperature rise after the activation of the bimetal 15 until the center thermostat 16 is activated becomes gradual, and the temperature rise in the center thermostat 16 is slow.
After the operation of step 6, the temperature of the rice bowl 8 decreases gradually due to the heat storage effect of the closed space 10, and a sufficient time (unbalanced time) to maintain the temperature of the rice in the rice bowl 8 at around 100°C is ensured. can do.

Generally, after cooking is completed, rice should be kept at a temperature of 98℃ or higher.
It is said that if you keep the rice for 15 minutes or more, the rice will become evenly distributed and will be cooked well.In the case of the electric rice cooker of this example, it is possible to secure enough time for this uniformity, and it is possible to cook delicious rice. It can be cooked.

In addition, in the above embodiment, an electric rice cooker for both cooking rice and keeping warm has been described, but it goes without saying that the present invention can also be applied to an electric rice cooker exclusively used for cooking rice.

Next, the effects of the electric rice cooker of the present invention will be described.

That is, according to the present invention, the hot plate 12 for rice cooking that comes into contact with the bottom surface of the rice bowl 8 housed in the main body case 1 through the closed space 10 is movable up and down, and the hot plate 12 is moved up and down. When the temperature of the rice bowl 8 reaches a temperature t ₁ that is slightly lower than the cooking temperature t ₂ , the bimetal 15 that bends and operates can separate it from the bottom of the rice bowl 8 , so that the rice is cooked only after the bimetal 15 is activated. By this time, heat is stored in the closed space 10, and the temperature drop in the rice cooker 8 after the rice is cooked can be slowed down, and by ensuring sufficient cooking time, delicious rice can be cooked. It has the practical effect of being able to increase

Furthermore, by separating the hot plate 12 from the bottom surface of the rice bowl 8, the temperature of the air between the hot plate 12 and the rice bowl 8 increases rapidly, and convection flows toward the periphery of the rice bowl 8.
There is also the advantage that the rice is heated from the periphery of the rice bowl 8 just before the rice is cooked, and the same effect as that of cooking in a stove can be expected.

Furthermore, a spring 13 for biasing the hot plate 12 upward is disposed around a mounting leg 14 that protrudes from the lower surface of the hot plate 12 and passes through the bottom of the inner case 3.
Furthermore, since the thermally responsive member 15 is interposed between the lower end of the mounting leg 14 and the lower surface of the inner case 3 to constitute the hot plate operating mechanism, the structure is simple and compact.

[Brief explanation of the drawing]

Fig. 1 is a half-mounted sectional view of an electric rice cooker according to an embodiment of the present invention, Figs. 2 and 3 are enlarged views of main parts to explain the operating state, and Fig. 4 is an electric rice cooker of Fig. 1. It is a graph showing a change in the temperature of a rice bowl. 1... Main body case, 3... Inner case, 8... Rice bowl, 10... Closed space, 12... Heat sink, 15...
…bimetal.

Claims (1)

[Scope of utility model registration request] The opening edge 8a of the rice bowl 8 is attached to the shoulder 1a of the main body case 1.
This is an electric rice cooker in which a sealed space 10 is formed between a main body case 1 and a rice cooker 8 by suspending a rice cooker. A hot plate 12 is disposed so as to be movable up and down via a mounting leg 14 projecting from the lower surface of the heat plate 12 and penetrating the bottom of the inner case 3, and around the mounting leg 14, the heat A spring 13 is provided that urges the plate 12 upward to abut against the bottom surface of the rice bowl 8, and the hot plate 12 is moved downward between the lower end of the mounting leg 14 and the lower surface of the inner case 3. When the temperature of the rice cooker 8 reaches a temperature t ₁ slightly lower than the finished cooking temperature t ₂ , the heat plate 12 is moved to the rice cooker by the heat response member 15 . 8. An electric rice cooker characterized in that it can be separated from the bottom.