JPH0739453A - Electric rice cooker - Google Patents

Abstract

PURPOSE:To improve thermal efficiency and to quickly cook to be tasty by using glass which transmits an electromagnetic wave of far-infrared radiation in an inner pot, using such a heat source for generating an electromagnetic wave as a halogen lamp, a xenon lamp or the like in a heater, and forming a space between the heater and the inner pot. CONSTITUTION:An inner pot 13 is supported by an inner pan 14 provided inside a main body 15, and formed by glass which transmits an electromagnetic wave of far-infrared radiation and a visible light ray. A heater 11 uses a heat source which generates a visible light ray and an electromagnetic wave such as a halogen lamp, a xenon lamp or the like, and is disposed through a transmit plate 12 of the bottom of the inner pot 14. A visible light ray and an electromagnetic wave generated from the heater 11 are passed through the transmit plate 12, and reflected by the inner pan 14 to directly irradiate rice and water in the inner pot 13 evenly. Thus, the thermal efficiency can be improved and tasty cooked rice can be quickly obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker having a heat retaining function, and more particularly to an electric rice cooker having improved rice cooking performance and heat insulating efficiency.

[0002]

2. Description of the Related Art A conventional electric rice cooker of this type, for example, an electric rice cooker with improved rice cooking performance is disclosed in Japanese Utility Model Publication 58-5184.
There is one described in Japanese Patent No.
In the electric rice cooker disclosed in Japanese Patent No. 44, the inner pot 2 arranged in the main body 1 is formed by aluminum die casting as shown in FIG. 3, and the high temperature heating element 3 composed of a sheathed heater is arranged in the lower space.
The cooked rice is cooked from the entire circumference through the heating space on the outer circumference of the inner pot 2 so that the cooked rice can be evenly cooked and the rice can be cooked with a high starch gelatinization rate.

An electric rice cooker having a heat retaining function is shown in FIG.
The rice cooker heater 7 for heating the inner pot 6 disposed in the main body 5 is disposed in the main body 5 as shown in FIG.
Is provided, the lower surface of the upper lid 8 is heated by the heat generated by the heat-retaining heater 9, and the inner lid 10 is heated by convection to keep the temperature.

[0004]

In the electric rice cooker having the above-mentioned structure to improve the rice cooking performance, the inner pot of the aluminum die casting and the sheathed heater have a large heat capacity, and the high-temperature space changes from the inner pot to the inner pot. Heat transfer is small (high reflectance with aluminum die casting), so the heat response is poor and a large amount of heat cannot be added to the cooked rice. Therefore, the time required to cook rice from the start of cooking to the end of cooking I couldn't cook evenly and deliciously cooked rice.
When the sheath heater is heated to a high temperature, the amount of heat radiated from the main body to the outside is increased, the thermal efficiency is deteriorated, and the life of the sheath heater is shortened.

Further, since the electric rice cooker having the heat retaining function having the above-mentioned structure heats the inner lid by convection, the heat transfer by this convection is inefficient and the temperature change of the inner lid becomes large. Condensation occurred on the inner lid and overheating occurred, which had a problem of affecting the warm rice.

The present invention makes it possible to speed up the cooking time by improving the heat transfer from the heat source to the cooked rice in the inner pot, and by heating the rice from the entire circumference of the inner pot. The present invention provides an electric rice cooker that cooks rice and improves heat efficiency.

[0007]

DISCLOSURE OF THE INVENTION The present invention has solved the above-mentioned problems, and uses a heat source having a fast heating response (electromagnetic wave generation response), such as a halogen heater, and is a glass that easily transmits electromagnetic waves. The inner pot is used to improve the thermal efficiency to speed up the rice cooking time, and the heat-retaining heater uses a heat source that generates electromagnetic waves, such as a halogen lamp. (Aluminum) material, coated on its upper surface with good electromagnetic wave absorption efficiency (ceramic type), forms a space between the heat insulation heater and the inner lid, and directs and reflects the electromagnetic waves from the heat insulation heater by By adding to the inner lid, the efficiency of heat retention is improved.

[0008]

With the above structure, the rice cooking water itself, not the inner pot, is directly heated, so that the heat efficiency is good and the rice can be cooked quickly.

Further, since the rice can be heated from the entire circumference of the inner pot so as to cover the cooked rice, it is possible to cook delicious cooked rice without unevenness in cooking.

Further, since the temperature change of the inner lid is reduced during the heat retention and there is no dew condensation or overheated state, it is possible to eliminate the problem of partial stickiness of the heat-retained rice and the drying time due to the fall of the dew condensation water.

[0011]

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

In FIG. 1, reference numeral 11 denotes a rice cooking heater including a halogen lamp or a xenon lamp for generating an electromagnetic wave (hereinafter, simply referred to as an electromagnetic wave) including a wavelength in the range of visible light to far infrared rays, and 12 denotes an electromagnetic wave from the rice cooking heater 11. A transparent plate made of glass whose main material is a glass that penetrates the rice cooker heater 11 to prevent foreign matter from entering the portion where the rice cooker heater 11 is disposed and prevent the rice cooker heater 11 from being soiled.
To improve the cleanability of the. Reference numeral 13 denotes a rice cooker made of glass, which is mainly made of glass that transmits electromagnetic waves from the rice cooker 11, and an inner pot containing the cooked rice. The inner wall of the inner pot 13 is coated with a fluorine resin. The cooked rice adhering to the inner pot 13 can be easily washed off to improve the cleanability. Reference numeral 14 denotes an inner pot which is formed of a metal reflector and reflects almost all the electromagnetic waves from the rice cooking heater 11 around the inner pot 13. The inner pot 14 reflects the electromagnetic waves to the inner pot. The cooking water in 13 is uniformly heated to raise the temperature, and the cooked rice in the inner pot 13 is evenly absorbed to eliminate the uneven cooking.

In the above case, the heat generated by electromagnetic waves in the glass inner pot 13 is 5 to 10%, and most of the remaining heat is absorbed by the cooked rice in the inner pot 13 to heat the cooked rice. It contributes to speeding up. Also, the inner pot 13
The thermal conductivity of glass, which is the material forming the
Is 1.2 Kcal / mh ° C., and the heat insulating effect is large as is apparent from the conventional aluminum having a thermal conductivity of 177 Kcal / mh ° C. Therefore, in the present invention using glass for the inner pot 13, the The heat is insulated by the inner pot 13 so that the inner pot 14 does not reach a high temperature, and the temperature rise of the main body 5 does not pose a problem even if a heat insulating material is not used.

However, since the inner pot 13 made of glass has a heat insulating property, it is difficult to detect the temperature of the cooked rice inside from the outer wall temperature of the inner pot 13. Therefore, the present invention takes this point into consideration. In particular, as shown in FIG. 2, a part of the inner pot 13 is provided with a temperature detecting section 16 made of a metal material having good heat conductivity.

The temperature detecting portion 16 is composed of an inner stopper 20 having a male thread portion, an outer stopper 21 having a female thread, and a packing 22 formed of a silicone rubber O-ring. By tightening the screw parts of the tool 20 and the outer stopper 21, the inside and the outside of the inner pot 13 are sealed and blocked by the packing 22 to prevent leakage of the cooked rice in the inner pot 13 and the temperature of the outer stopper 21. The temperature of the rice cooked in the inner pot 13 can be accurately detected by detecting the temperature by the temperature sensor.

The present invention uses a heat source for generating electromagnetic waves, such as a halogen lamp, for the heat-retaining heater 17 as shown in FIG. An upper surface of a metal material such as aluminum having a good heat conductivity is coated with a ceramic material having a good absorption efficiency of electromagnetic waves, and a space is formed between the heat-retaining heater 17 and the inner lid 19. The inner lid 1 is obtained by direct reflection or reflection of electromagnetic waves from the heater 17.
It is configured to be added to 9.

With the above construction, the heat retaining heater 17 has a faster thermal response than the conventional cord-shaped heating wire system, and the inner lid 19 is heated by the radiant heat from the heat retaining heater 17. It is possible to improve the thermal responsiveness, so that the temperature change of the inner lid 19 is reduced, and there is no dew condensation or overheating. Problems such as drying can be eliminated.

[0018]

Since the rice cooker of the present invention has the above-mentioned structure, the invention of claim 1 is such that the heat of electromagnetic waves generated by the rice cooking heater is generated not by the inner pot but by the rice cooking water itself inside. Since it is heated directly, it has good thermal efficiency and can cook rice quickly, and since it can be heated from the entire circumference of the inner pot, delicious cooked rice with no unevenness in cooking can be cooked.

Since the foreign matter does not enter the rice cooking heater, the rice cooking heater is not contaminated, and the transparent plate can be easily cleaned. Can be given to.

Further, according to the third aspect of the invention, since the temperature of the cooked rice in the inner pot can be accurately detected, it is possible to cook the rice without burning.

Further, in the invention according to claim 4, the cooked rice attached to the inner pot can be easily washed off, and the cleanability can be improved.

Furthermore, in the invention according to claim 5, the temperature change of the inner lid is small, and there is no dew condensation or overheating.
Problems such as dryness disappear.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of an electric rice cooker of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a temperature detection unit of FIG.

FIG. 3 is a cross-sectional view of essential parts showing an example of a conventional electric rice cooker.

FIG. 4 is a cross-sectional view of essential parts showing another embodiment of the conventional electric rice cooker.

[Explanation of symbols]

 11 Rice Cooker 12 Transmission Plate 13 Inner Pot 14 Inner Pan 15 Main Body 16 Temperature Detector 17 Heat Keeper 18 Upper Lid 19 Inner Lid 20 Inner Stopper 21 Outer Stopper 22 Packing

Claims (5)

[Claims] 1. A glass which can transmit electromagnetic waves of visible to far infrared rays is used for the inner pot, and a heat source for generating electromagnetic waves such as a halogen lamp or a xenon lamp is used for the rice cooking heater. An electric rice cooker characterized by forming a space inside and adding electromagnetic waves from a heat source to the entire circumference of the inner pot by direct radiation or reflection from the inner pot. 2. A transmission plate made of glass capable of transmitting electromagnetic waves of visible rays to far infrared rays is provided between the rice cooking heater and the inner pot to prevent foreign matter from entering the rice cooking heater section. The electric rice cooker according to claim 1, which is characterized in that. 3. The temperature of the metal material is configured such that a metal material having good heat conduction is used for a part of the inner pot, the metal material penetrates the inside and the outside of the inner pot and the inside and the outside of the inner pot are blocked by a seal. The electric rice cooker according to claim 1, wherein the temperature of the cooked rice or the like is detected by measuring the temperature. 4. The electric rice cooker according to claim 1, wherein the inside of the inner pot is coated with a transparent fluorine-based resin that transmits electromagnetic waves well. 5. A heat source that generates electromagnetic waves, such as a halogen lamp, is used as the heat-retaining heater, a metal material such as aluminum having good thermal conductivity is used for the inner lid, and a ceramic with good electromagnetic wave absorption efficiency is provided on the upper surface. An electric rice cooker characterized by coating a system material, forming a space between the heat retaining heater and the inner lid, and applying electromagnetic waves from the heat retaining heater to the inner lid by direct irradiation or reflection.