JPH04132520A - Electric rice cooker - Google Patents

Abstract

PURPOSE:To raise the heating temperature of a heating part and efficiently cook delicious boiled rice in a short time period by providing two or more convection holes on a reflection plate so that thermal convection is produced between a space between the reflection plate and a pot, bottom and a space behind the reflection plate. CONSTITUTION:A heating element 5 is mounted on the bottom of an outer pot 2 to directly heat a pot bottom 3a, and is a pipe heater 5a formed into a plane spiral shape. A plane reflection plate 8 is furnished under the heating element 5 to reflect the heat, that is radiated from the heating element 5, to the pot bottom 3a, and has two or more convection through-holes 9. A space (a) between the reflection plate 8 and the pot bottom 3a of an inner pot 3 reaches a high temperature due to the heat generated by the heating element 5, and a space (b) behind the reflection plate 8 is kept at a low temperature because the heat is shielded by the reflection plate 8, causing a vertical natural heat convection to be generated between the spaces (a) and (b) as shown by arrows (c) due to the temperature difference between the spaces (a) and (b). Therefore, heat eddy currents are produced in the space (a) by the heat convection, and the pot bottom is uniformly and efficiently heated by the heat, convection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electric rice cooker, and more particularly to its heating portion.

[Conventional technology]

Conventional rice cookers include both gas and electric rice cookers. Figure 5 shows a graph of changes in cooking time and pot bottom heating temperature for gas rice cookers and conventional electric rice cookers. show.

Table 1 From the table above and the graph in Figure 5, gas rice cookers have a higher heating temperature than electric rice cookers, so the table below shows the differences between conventional gas rice cookers and electric rice cookers. It is easy to understand that the cooking time is short and the rice cooking efficiency is high.

[Problem to be solved by the invention] However, gas rice cookers not only have safety problems such as gas leaks, but also require piping work for gas pipes, which increases equipment costs. There is an awareness.

On the other hand, electric rice cookers are widely used in homes and small restaurants because they are highly safe and do not require any special electrical work; Because the temperature is low, the cooking time is long and the efficiency is low.

The present invention has been made in view of the above-mentioned problems of the conventional electric rice cooker, and by increasing the heating temperature of the heating section, it is possible to cook delicious rice in a short time and efficiently. [Means for solving the problem] In order to achieve the above object, the electric rice cooker of the present invention has an inner pot for cooking rice, A heating element that heats the bottom of the inner pot with an open flame, and a reflecting plate that emits heat from the heating element to the bottom of the cooking pot as reflected heat, the reflecting plate including:
It is characterized by having a required plurality of convection holes for generating heat convection between the bottom of the pot and the back of the reflector.

[Operation] When the heating element is energized, the heating element generates heat to obtain the required amount of heat, and the bottom of the pot is directly heated by this heat.

Further, the heat of the heating body is reflected by the reflecting plate, and the bottom of the pot is also heated by this reflected heat.

Due to the heat generated by the heating element, the gap between the reflector and the bottom of the pot becomes high in temperature, while the back side of the reflector is heated by the reflector!
11! :i! [Because the temperature is maintained at a low temperature by the reflector, natural convection of heat occurs between the gap and the back of the reflector through the convection holes in the reflector, which causes a vortex of heat in the vertical direction within the above-mentioned space. The bottom of the pot will be heated evenly and efficiently.

C Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The first section shows a schematic sectional view of the rice cooker of the first implementation example, and the second section shows a schematic cross-sectional view of the rice cooker of the first implementation example.
The figure shows a partially enlarged view of the heated part.

As shown in FIG. 1, an outer pot 2 is installed in an outer frame l that constitutes the outer shell of the rice cooker, and an inner pot 3 for cooking rice is installed in the outer pot 2.
is removably inserted into the interior, and an outer cover 4 is disposed on the negative side of the opening edge of the outer frame 1 by means of a hinge (not shown) so that it can be opened/closed and detached.

The outer lid 4 includes a handle 4 for opening and closing, an inner M4b for opening and closing the opening of the inner pot 3, a hook for holding the lid closed, a steam cap, etc. (not shown).

A heating element 5 for directly heating the pot bottom 3a of the inner pot 3 is disposed at the bottom of the outer pot 2.

The heating body 5 is formed by arranging the illustrated vibrator heater 5a in a spiral shape on a flat surface, and includes a cord 6 connected to a power source (not illustrated), and switches and keys (not illustrated) of the operation panel 7. A flat reflecting plate 8 is disposed at the bottom of the outer pot 2 and below the heating body 5, and is connected to the main body, and is energized or de-energized by operating a switch.
The heat generated from the heating body 5 is reflected and reflected heat is emitted to the pot bottom 3a of the inner pot 3.

The flat reflecting plate 8 is horizontally disposed by having its peripheral edge 8a hooked to the opening edge 2a of the outer hook 2 and fixed with screws (not shown), etc. The heating body 5 is fixed to the reflection plate 8 by a connecting member (not shown) at a required distance from the opposite slope 8a of the FR8.

Further, the reflecting plate 8 has a required plurality of convection holes 9 passed through it.

These convection holes 9... are formed when the gap a between the reflector plate 8 and the pot bottom 3a of the inner pot 3 becomes high temperature due to the heat generated by the heating element 5, and the space on the back side of the reflector plate 8 becomes hot. Due to the temperature difference between the gap a and the space, which is maintained at a low temperature by being blocked by the reflective plate 8, natural convection of heat between the gap a and the space is caused by the arrow C in FIG. As shown in , it is provided in order to cause it to occur in the vertical direction.

Therefore, a heat vortex is generated within the gap a due to heat convection.

Next, FIG. 3 shows a schematic sectional view of the rice cooker of the second embodiment, and FIG. 4 shows a partially enlarged heating portion thereof.

The rice cooker of the first embodiment differs in the structure of the heating body 5 and the reflection plate 8, but is the same in all other respects.

That is, the heating body 5 of the second embodiment has the illustrated round bar-shaped heating wire 5b formed in the same shape as that of the first embodiment, and may be appropriately omitted depending on the application and the like.

In addition, the reflector plate 8 of the second implementation example has a lower part recessed in an arc shape to match the shape of the heating element 5, and is provided with an arc groove 8C, thereby increasing the heat reflection efficiency. The shape of the plate 8 is not limited to the above-mentioned shape, and may be formed into a wave-shaped curve, for example.

[Effects of the Invention] Since the present invention is configured as described above, the amount of heat is increased by the direct fire from the heating body and the heat reflected by the reflector, and the bottom of the pot is evenly spread by the convection of these heats. And because it can be heated efficiently, it is possible to efficiently prepare perfectly delicious rice in a short time even with an electric method.

In addition, the structure is simple because a reflecting plate is simply added to the heating element, and the heating element does not need to have a particularly large capacity, so it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of a first embodiment of an electric rice cooker according to the present invention, FIG. 2 is an enlarged vertical cross-sectional view showing a part of the heating part of the same embodiment, and FIG. A schematic vertical cross-sectional view of the second embodiment,
Figure 4 is an enlarged vertical cross-section showing a part of the heated part of the same example, and Figure 5 shows the cooking time and pot bottom of the conventional gas rice cooker and electric rice cooker. jJl! It is a graph showing changes in temperature. In the diagram, main rows 3...inner pot 5...heating body 3a...pot bottom 8...reflection plate 9...convection hole

Claims (1)

[Claims] It is equipped with an inner pot for cooking rice, a heating element that heats the bottom of the inner pot with an open flame, and a reflecting plate that emits the heat of the heating element as reflected heat to the bottom of the cooking pot, and the reflecting plate includes: An electric rice cooker characterized in that the reflector is provided with a required plurality of convection holes for generating heat convection between the bottom of the pot and the back of the reflector.