JPH062617Y2 - rice cooker - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention forms a heating space between the inner bottom of the container body and the outer bottom of the container, and a rice cooking heater is provided in this heating space. Regarding rice cookers.

(Prior Art) Conventional rice cookers are roughly classified into a hot plate type and a radiant heating type. As shown in FIG. 6, the hot plate type rice cooker is provided with a hot plate 2 having a heating element 2A on the inner bottom portion of the main body 1, and the container 3 is placed on the hot plate 2 so that the outer bottom portion is placed thereon. Main body 1
It is supposed to be housed in. As shown in FIG. 7, the radiant heating type rice cooker forms a heating space 6 between the inner bottom portion of the bowl body 4 and the outer bottom portion of the container 5 housed in the bowl body 4, and the heating space 6 is formed in the heating space 6. A rice cooking heater 7 is provided. Further, as a modification of this radiant heating type rice cooker, as shown in FIG. 8, a heating space 10 is formed between the inner bottom portion of the main body 8 and the outer bottom portion of the container 9, and the rice heating heater 12 is provided on the heat insulating material 11.
It is well known that the rice cooker is provided with a heating element 14 provided in the heating space 10 and having a heating member 14 whose upper surface is covered with a coating material 13 made of steel plate or glass.

(Problems to be solved by the invention) In the hot plate type rice cooker, although the rice temperature does not drop in a short time after the completion of rice cooking because the heat capacity of the hot plate 2 is large, if rice grains adhere to the hot plate 2 Since the degree of adhesion between the container 2 and the container 3 is reduced, uneven heating may occur due to uneven heating, and the hot plate 2 may be deformed by local heating. Further, in the radiant heating type rice cooker, since only the vicinity of the rice cooker heater 7 is heated by heat generation, the central portion of the container 5 is less heated, and as a result, the rice in the central portion of the container 5 does not absorb water sufficiently and is cooked. There are problems such as unevenness in the rise and depression of the center of the cooked rice.
Further, in the radiant heating type rice cooker, since the rice cooker heater 7 has a small heat capacity, the temperature of the rice cooked after the rice is cooked is reduced in a comparatively short time, so that the uneven cleaning effect is small, and it is hot when the meal is eaten after a while. In addition to not being able to eat rice, it reaches the heat retention set temperature relatively quickly after the rice has been cooked, and power consumption during heat retention increases. Moreover, the body 4
There is also a problem in that the rice cooking heater 7 is an obstacle when cleaning the inner bottom portion of the dish, making it difficult to clean.

In the rice cooker shown in FIG. 8, the heating element 14 faces the entire outer bottom surface of the container 9 so that the central portion of the container 9 can be heated well, and the heat capacity of the heating element 14 can be increased so that the rice is cooked. Even in the case of what can prevent the decrease in rice temperature,
Since the rice cooking heater 12 is surrounded by the heat insulating material 11 and the steel plate 13, etc., there are problems that the heat dissipation of the rice cooking heater 12 is low and the life of the rice cooking heater 12 is shortened, or the thermal efficiency is lowered and the rice cooking performance is deteriorated. It was

An object of the present invention is to provide a rice cooker which solves the above problems and improves the rice cooking performance by improving the thermal efficiency in a radiant heating type rice cooker and which is excellent in cleaning property.

[Structure of the Invention] (Means for Solving the Problem) The present invention provides a heating space 27 between an inner bottom portion 25 of a vessel body 21 and an outer bottom portion 26 of a container 24 housed in the vessel body 21. A rice cooking heater 28 is provided in the heating space 27, and the upper surface side, the lower surface side and the side surface side space portions 32, 34 are provided between the rice cooking heater 28 and the inner bottom portion 25 of the vessel body 21 so as to face the outer bottom portion 26 of the container 24. , 35
The heat storage body 29 is provided via the.

(Operation) When the rice cooking heater 28 generates heat due to the above configuration, the heat storage body 29
The outer bottom portion 26 of the container 24 is entirely heated by the heat conduction to eliminate uneven heating, and the rice cooker heater 28 has a peripheral area open by the upper space 32, so that heat dissipation is high and rice cook efficiency can be improved.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 3 show the first embodiment, and 21 is a container body composed of an outer case 22 and an inner case 23, and a container 24 is housed in the container body 21 in a freely attachable and detachable manner. . A heating space 27 is provided between the inner bottom portion 25 of the vessel body 21 and the outer bottom portion 26 of the container 24, and a rice cooking heater 28 such as a sheath type heater is provided in the heating space 27. 29 is the container between the inner bottom portion 25 of the bowl body 21 and the rice cooking heater 28
The heat storage body 29 is provided so as to face the outer bottom portion 26 of the 24. The heat storage body 29 is made of a ceramic material including general porcelain such as zirconia, alumina, silicon carbide, and silica, and has a thickness of about 4 to 6 mm. Yes, the surface is processed into a smooth state with a reflection effect, and the color of the heat storage body 29 is white or gray or aluminum when the reflection effect is the main, and the radiation effect is the main. In some cases, the color tone is black. Further, a groove 31 having a semicircular cross section is formed in an annular shape on the upper surface 30 of the heat storage body 29, and the groove 31 is formed.
The upper part of the rice cooking heater 28 is arranged in the same plane as the upper surface 30 of the heat storage body 29. The heating space 27 is an upper surface side space portion 32 formed between the groove 31 of the heat storage body 29 and the rice cooking heater 28, and a lower surface side space portion formed between the lower surface 33 of the heat storage body 29 and the inner bottom portion 25. 34, a side space 35 formed between a side of the heat storage body 29 and a side of the inner case 23, and an upper space 36 formed between the rice cooking heater 28 and the outer bottom 26. Reference numeral 37 is a heat-sensitive portion that can come into contact with the outer bottom portion 26 of the container 24, and 38 is a lid body having a steam port 39 for opening and closing the upper opening of the vessel body 21, and a lid heater on the lower surface side.
40 are provided. Reference numeral 41 is a body heater mounted on the inner case 23.

Next, the operation of the above configuration will be described.

When an appropriate amount of rice and water is weighed and placed in a container 24 and the container 24 is housed in the container body 21, the heat-sensitive part 37 is set in contact with the outer bottom part 26, and then the lid 38 is closed. Then, when the rice cooking switch (not shown) is operated, the rice heating heater 28 generates heat, the upper bottom of the rice heating heater 28 radiates directly to the outer bottom portion 26 of the container 24, and the lower portion of the rice heating heater 28 stores heat. Radiant heat is radiated to the upper surface 30 of 29, and the radiated heat thus radiated is reflected by the upper surface 30 to heat the container 24. Further rice heating heater 28
The heat storage body 29 heated while the
Radiant heat is radiated toward 26 for heating, and radiant heat radiated from the lower surface 33 is reflected by the inner bottom portion 25 to pass through the lower surface side space portion 34 and the side surface side space portion 35 to heat the inside of the container 24. When the container 24 is heated in this way, as shown in FIG.
You can cook rice by heating the temperature from the top X to the center Y of the 24 and the bottom Z. When the cooking of rice is completed, the heat sensitive section 37 senses this and the rice cooking heater 28 is cut off. After that, the heat stored in the heat storage body 29 is gradually released to heat the container 24 and keep it warm.
Therefore, the rate of decrease of the rice temperature after the completion of rice cooking becomes slower, and as a result, the temperature at about 100 ° C becomes longer than the conventional one shown by B as shown in A of Fig. 3, and the rice can be fully converted into α, and You can eat hot rice even after a while. After use, the container 24 is taken out and the upper surface 30 of the heat storage body 29 is removed.
It can be cleaned by wiping rice grains etc.

As described above, in the above embodiment, the outer bottom portion 26 of the container 24 is
And rice cooker in the heating space 27 provided between the inner bottom 25 of the container body 21
28 is provided, and the rice cooking heater 28 and the inner bottom portion 25 are provided.
Since the heat storage body 29 is provided so as to face the outer bottom portion 26 in between, the outer bottom portion 26 of the container 24 is entirely covered by radiant heat radiated from not only the rice cooking heater 28 but also the upper surface 30 and the lower surface 33 of the heat storage body 29. Since the rice is heated, it can be cooked with good heat efficiency, so there is no unevenness in the cooking or dents in the center of the cooked rice. Further, after the rice is cooked, the container 24 is heated by the radiant heat emitted from the heat storage body 29, so that the temperature of the rice drops slowly, the rice is sufficiently α, and the rice is kept high heat for a relatively long time. In addition, the power consumption of the body heater 41 and the like required for keeping the temperature can be reduced. Further, since the heat storage body 29 is relatively thick, it has a high heat insulating effect and can prevent heat radiation from the inner bottom portion 25 side to the outside.

Further, since the rice cooking heater 28 is provided on the heat storage body 29 through the upper space 32, the rice cooking heater 28 has high heat dissipation, and therefore the life of the rice cooking heater 28 is extended,
Also, the thermal efficiency can be improved.

Moreover, since the heat storage body 29 is provided below the rice cooking heater 28, rice grains and the like do not fall onto the inner bottom portion 25 and can be easily cleaned. Further, the heat storage body 29 is made of a ceramic having a smooth surface. Even if rice grains adhere to the upper surface 30 of the heat storage body 29, the rice grains do not stick and can be easily wiped off, and the groove 31 forms the rice cooker heater 28 and the upper surface 30 in substantially the same plane. By doing so, the rice cooking heater 28 does not get in the way when the rice grains are wiped off.

4 and 5 show a second embodiment and a third embodiment, the same parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, the side of the groove 31 formed in the heat storage body 29 is an inclined surface 42, and a rib 43 is provided so as to surround the heat-sensitive portion 37. The inclined surface 42 reflects the radiation heat efficiently. In addition, the heat sensitive portion 37 and the heating space 27 side are insulated by the rib 43 so that the heat sensitive portion 37 can accurately detect the temperature without being influenced by the temperature of the heating space 27.

In the third embodiment, the base portion 44 for preventing the rice cooking heater 28 from hanging down is formed in the groove 31 on the inside of the heat storage body 29, and the heater mouth 45 for supplying power to the rice cooking heater 28 is formed in the groove 31 on the outside. Further, a heater pressing portion 46 is partially provided on the upper part of the rice cooking heater 28 so that the rice cooking heater 28 can be mounted at a predetermined position, and the pressing insulator of the rice cooking heater 28 and the heat storage body 29 are integrated. Therefore, the number of parts can be reduced.

The present invention is not limited to the above-described embodiment. For example, the rice cooking heater may be a ceramic heater or a halogen heater whose outer tube is made of an insulating material, and a fibrous ceramic such as alumina or silica is used as a heat storage material. Various modifications are possible, such as the use of sintered or binder-hardened ceramic fibers for weight reduction.

[Advantages of the Invention] In the present invention, a rice cooking heater is provided between the inner bottom of the container body and the outer bottom of the container, and the heat storage body is provided between the rice cooking heater and the inner bottom so as to face the outer bottom. By providing the above, it is possible to eliminate uneven heating during cooking rice and to cook rice uniformly without unevenness and pits, and it is possible to improve thermal efficiency at the initial stage of heat generation due to the heat insulating effect of the heat storage body. After cooking rice, the rice can be kept at a high temperature for a relatively long time due to the heat storage effect of the heat storage body. Further, since a space on the upper surface side is provided between the rice cooking heater and the heat storage body, the heat dissipation is excellent and the rice cooking efficiency can be improved and the life of the rice cooking heater can be extended. Moreover, since rice grains and the like that have fallen into the vessel frame accumulate on the heat storage body, cleaning can be performed easily.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a longitudinal sectional view of an essential part, and FIG.
Fig. 4 is a temperature graph showing the state of cooked rice, Fig. 4 is a longitudinal sectional view showing the second embodiment, Fig. 5 is a longitudinal sectional view showing the third embodiment, and Fig. 6 is a sectional view of a conventional hot plate type rice cooker. FIG. 7 is a sectional view of a conventional radiant heating type rice cooker, and FIG. 8 is a sectional view of another conventional radiant heating type rice cooker. 21 ... Vessel main body 24 ... Container 25 ... Inner bottom 26 ... Outer bottom 27 ... Heating space 28 ... Rice cooking heater 29 ... Heat storage body 32 ... Upper surface side space 34 ... Lower surface side space 35 ... Side surface side space

Claims (1)

[Scope of utility model registration request] 1. A container housed in a container body, and a heating space provided between an inner bottom portion of the container body and an outer bottom portion of the container,
A rice cooking heater provided in the heating space, and a heat storage body facing the outer bottom portion of the container and provided between the rice cooking heater and the inner bottom portion of the container body via the upper surface side, the lower surface side, and the side surface side space portion. A rice cooker characterized by being equipped.