JPH07280279A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To enable a delicious cooking to be attained by performing an efficient and uniform heating operation. CONSTITUTION:An electromagnetic wave radiated upwardly from a heater 2 is reflected directly or through reflecting plates 5 and 12, passes through a transmitting plate 4 and reaches an inner pot 3. The electromagnetic wave is absorbed from an outer surface of the inner pot 3 and is converted into heat. Due to a presence of a thermal insulating layer 7, heat radiation from an outer surface is not released to an outer side of the transmitting plate 4. At the inner surface of the inner pot 3, the heat radiation is carried out by a far-infrared radiation film 11, rice and water are heated and the rice is cooked. A temperature rising into a water absorbing region during the rice cooking operation is made fast, a uniform temperature at the water absorbing region can be attained and a temperature range can be made narrow, resulting in that a sufficient absorption of water is performed for the rice. The temperature rising into the rice cooking region is made fast and the rice is cooked up with a uniform temperature heating and starch is completely changed into alpha-phase in a warming region so as to finish a delicious rice cooking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to visible light, near infrared rays,
The present invention relates to a heating cooker using a halogen heater or the like that emits infrared electromagnetic waves as a heat source.

[0002]

2. Description of the Related Art Conventionally, as a heating means of an electric heating cooker, a sheath heater or a sheath heater-implanted aluminum die-cast hot plate has been mainly used. Further, as another means, there is a micron heater having a structure in which a nichrome wire heater is formed into a spiral coil shape and mounted inside a milky white quartz glass tube like an oven toaster. And, although it is a very small number, there is one using a transparent quartz glass tube instead of the milky white quartz glass tube.

[0003]

However, although the glass tube heater can be used in the oven toaster due to the structure of the product, it is not used in the electric jar rice cooker, electric pan, electric cooking hot plate, or electric jar pot. . This is because the thermal shock resistance of the quartz glass tube is not sufficient and the electromagnetic wave emitted from the glass tube heater has a wavelength of 4.0 to 14 μm.
This is because it is used only in the near-infrared or far-infrared range of m, and heat is generated in the atmosphere in the air, so that the life of the heater wire at high temperature is shortened due to air oxidation deterioration. Further, in order to irradiate visible rays in near-infrared rays, infrared rays, and far-infrared rays and heat rays of near-infrared rays of 0.3 to 5.6 μm, the heater wire is heated to a high temperature of around 2000K. Although it is necessary, it is difficult to keep the heating element in a high-temperature bright red heat state due to the air oxidation deterioration phenomenon, and it is considered practically difficult to radiate a heat ray containing a large amount of visible light and near-infrared light.

In the case of a heating element using a sheathed heater, as a heating cooker, the heater has a heat capacity and the temperature rising speed is slow, and the heat transfer to the cooking surface is slow. , It is difficult to obtain delicious grilled and stewed foods. In particular, the problem demanded by the user is to speed up the cooking and the deliciousness due to the high heat power, and to secure the deliciousness by the rising heating cooking in which the temperature rises quickly in the rice cooker and the hot plate. For example, in a rice cooker, as shown in the rice cooking process curve shown in FIG. 5, it is important that the temperature rises to the water absorption region at the start of rice cooking, the temperature rises to the rice cooking region, and the descent time to the spotty region after cooking. . In addition, in the hot plate, when the temperature of the cooking plate reaches a certain temperature, the cooked food is placed and cooked by heating, and the rapidity of heating and heating when the cooked food is placed and the cooking is continued is required. However, the sheathed heater is not sufficient. Therefore, although a device for accurately controlling cooked foods is made in Japanese Patent Publication No. 5-72214 for a rice cooker using a sheathed heater, the target cooking function is not exhibited.

As described above, when the sheathed heater or the quartz glass tube heater is used as the heating element, high thermal power and high speed heating cannot be achieved, and the rise in temperature rise is not rapid. In addition, the heat ray emitted from the heating element is efficiently absorbed by the cooking surface, which does not constitute a cooker structure with high thermal efficiency.

In view of the above, an object of the present invention is to provide a heating cooker capable of ensuring highly efficient heating and realizing delicious cooking.

[0007]

Means for Solving the Problems The problem solving means according to the present invention comprises a heater for radiating an electromagnetic wave having a wavelength of 0.3 to 5.6 μm, a cooking container for absorbing the electromagnetic wave, and a transmission plate for transmitting the electromagnetic wave. The transparent plate is provided with a space between the heater and the cooking container.

A wavelength of 0.3 is formed on the outer surface of the cooking container.
Wavelength of 5.6 to 25 μm by absorbing electromagnetic waves of ˜5.6 μm
It forms a selective absorption film that blocks the radiation of electromagnetic waves. Further, a heat radiation film for heat radiation is formed on the cooking surface of the cooking container. The transparent plate is a transparent material having heat and impact resistance, and has a shape similar to a cooking container. Further, a reflection plate that reflects electromagnetic waves from the heater toward the transmission plate is provided outside the heater.

[0009]

In the above means for solving the problems, when the heater is energized, a part of the electromagnetic waves emitted from the heater directly penetrates the transmission plate and reaches the cooking container. Further, other electromagnetic waves are reflected by the reflecting plate, pass through the transmitting plate, and reach the cooking container. On the outer surface of the cooking container, the electromagnetic waves have a good wavelength matching with the selective absorption film, are absorbed by the cooking container, are converted into heat, and are thermally conducted to the inner surface. Further, a part of the absorbed heat is radiated as radiant heat to the space between the transparent plate and this space, which serves as a heat insulating layer and does not escape the radiant heat to the outside, and contributes to the heating of the cooking container again.

Far infrared rays are radiated on the cooking surface of the cooking container, and the heat heats the food to be cooked. In this way, almost no heat is radiated from the outer surface of the cooking container and convective radiation of heat by the heat insulating layer is prevented, so that uniform heating can be achieved with high efficiency and a delicious finish can be achieved.

[0011]

【Example】

(First Embodiment) A rice cooker as a heating cooker according to a first embodiment of the present invention includes a heater 2 for radiating visible, near-infrared and infrared electromagnetic waves in a rice cooker body 1 as shown in FIG. ,
An inner pot 3 which is a cooking container whose outer surface facing the heater 2 is surface-treated to absorb the electromagnetic waves and prevent the emission of far infrared rays; and a heat-resistant transparent plate 4 which transmits the electromagnetic waves.
The transmission plate 4 is provided outside the heater 2 and includes a reflection plate 5 that reflects electromagnetic waves from the heater 2 toward the transmission plate 4.
Are arranged with a space between the heater 2 and the inner pot 3, respectively.

A lid 6 is attached to the top of the rice cooker body 1 so as to be openable and closable, and a pan-shaped reflector 5 is placed inside the rice cooker body 1. Between the side surface of the reflector 5 and the rice cooker body 1. Is insulated by heat. Inside the reflection plate 5, a transmission plate 4 and a heater 2 which are similar in shape to the inner pot 3 are arranged. The transmission plate 4 is supported in a state of being floated from the reflection plate 5 by placing the outer edge of the upper part on the rice cooker body 1, and the heater 2 is supported between the bottom surface of the transmission plate 4 and the bottom surface of the reflection plate 5. It is installed by. Then, the inner pot 3 is arranged inside the transmission plate 4, and by placing the outer edge of the upper part of the inner pot 3 on the outer edge of the transmission plate 4, the inner pot 3 is supported in a state of floating from the transmission plate 4, This space becomes the heat insulating layer 7.

The heater 2 is a halogen heater that emits electromagnetic waves having a wavelength of 0.3 to 5.6 μm, such as visible light, near infrared rays, and mid-infrared rays. Power consumption is 1000 to 1
The voltage is 300 W and the operating voltage is 100 V, and the shape is one annular shape as shown in the figure, or two straight tubular ones are arranged in a two-character shape.

The inner pot 3 is made of aluminum, and has a black heat-resistant selective absorption coating 10 that absorbs electromagnetic waves well on the outer surface thereof. The inner surface, which is the cooking surface, has non-adhesiveness and heat radiation performance. A good far infrared radiation coating 11 is applied. At this time, the selective absorption film 10 has a large efficiency of absorbing the electromagnetic waves emitted from the heater 2 of 90% or more, and the heat rays converted from the absorbed electromagnetic waves into heat have a large effect of heating the water and rice in the inner pot 3. . Therefore, heat rays from electromagnetic waves are well absorbed, and radiant heat obtained by converting the absorbed heat rays into far infrared rays is prevented from escaping from the outer periphery of the inner pot 3, so that the inner surface of the inner pot 3 radiates heat well. The outer surface of the kettle 3 is subjected to alumite secondary electrolytic coloring or paint coating finish in which a thin semiconductor film of nickel oxide, copper oxide, chrome oxide, cobalt oxide, iron oxide or the like is finished to 10 μm or less. At this time, it is important that the selective absorption film has a composition that can withstand a temperature of 300 ° C. or higher. As a result, the heat radiation efficiency can be reduced, and the heating efficiency of the halogen heater and the absorption heating efficiency of the inner pot can be increased.

The far infrared radiation coating 11 on the inner surface of the inner pot 3 is made of iron as a black fluororesin coating,
It is coated with a heat-resistant fine powder of metal oxides made of copper, cobalt, chrome, etc., carbon black, mica pigment, and a paint whose main components are fluorocarbon tetrafluoride, and radiates heat rays with a wavelength of 5.6 to 25 μm. In addition, the cooked food is prevented from being scorched and the cleanability is improved.

Here, when an iron or stainless steel container is adopted for the inner pot, a chrome-plating thin black film treatment is applied to the selective absorption film treatment on the outer surface, or an electrolytic blackening treatment is applied to the inner surface. Fluorine resin coating of far-infrared radiation is applied on. When glass is used for the inner pot, when using transparent glass, a transparent fluororesin coating is applied to the inner surface of the transparent glass, or when using a heat and impact resistant glass container, heat resistance of 300 ° C or higher on the outer surface. Coating with a thin film selective absorption coating. Since many kinds of this paint are already on the market, the details are omitted. Moreover, the inner surface is coated with fluororesin.

The transmission plate 4 has a wavelength of 0.3 to 5.6 μm.
The transparent material having heat resistance and impact resistance such as crystallized glass or Pyrex glass which transmits the electromagnetic wave is molded into a concave shape. As a result, the heat radiation layer 7 prevents the radiant heat that is transmitted by the electromagnetic waves and is absorbed by the inner pot 3 to generate heat, and heats the inner pot 3 again. I can't miss it. In particular, as a practical glass material, a transparent crystallized glass that is compatible with an open flame is preferable.

The reflection plate 5 has a wavelength of 0.3 to 5.6 μm.
It is made of a material that can efficiently reflect the electromagnetic waves of, and aluminum is suitable for its performance and economy. However, since aluminum is inferior in corrosion resistance as it is, a thin film alumite in consideration of reflectance is generally used. And, the function of maximizing the heating efficiency by warming the inner pot 3 by reflecting the electromagnetic wave from the heater 2 and passing it through the transmission plate 4, and preventing the heat radiation to the rice cooker body 1, and even touching it It has a function to keep it in a non-heated state.

By the way, since the electromagnetic wave intensity is large below the heater 2, the bottom surface of the reflection plate 5 becomes extremely hot. Therefore, the corrugated auxiliary reflection plate 12 is mounted between the heater 2 and the bottom surface of the reflection plate 5. Since the thin film alumite as the auxiliary reflector 12 does not have heat resistance of 300 ° C. or higher and the corrosion resistance is not yet sufficient, aluminum is subjected to a thin film coating of silica-based transparent sol-gel to secure durability and reduce performance. Is lost. This sol-gel coating includes titania and zirconia other than silica-based. In the case of silica-based, siloxane of polysiloxane or the like is used as a starting material to form a sol of SiO ₂ into a solution-like transparent paint, which is degreased and rust-free. When the transparent coating material is applied to the surface that has been subjected to surface smoothing and cleaning treatment such as surface glossing, the sol gels and solidifies to form a film. Then, baking is performed at 150 to 400 ° C. to form a strong and transparent protective film for the reflection plate. At this time, the thickness of the protective film is 1
By setting the thickness to 0 μm or less, the light reflection performance of the heater 2 is not adversely affected.

In the above rice cooker structure, the inner cooker 3 and the transmission plate 4, the transmission plate 4 and the heater 2, and the heater 2 and the reflection plate 5 must be properly spaced from each other in terms of thermal efficiency. Since it is not possible to cook rice and keep warm, as a result of performing experiments, heat distribution analysis, heat absorption, and simulation of heat efficiency, the values of each of the intervals are set to 100 mm or less, 50 mm or less, 50 mm or less, and arranged. Is good.

In FIG. 1, 13 is a temperature sensor, 14 is an inner lid, 15 is a bowl receiver, and 16 is a blower. The rice cooker is also provided with a heat retention heater (not shown).
Then, the temperature control of the heater 2 is performed by the microcomputer based on the output signal from the temperature sensor 13 according to the ideal rice cooking process curve of the finished temperature and time of rice cooking and heat retention.

In the above structure, when the heater 2 is energized, the electromagnetic waves emitted upward from the heater 2 directly pass through the transmission plate 4 and reach the inner pot 3. Electromagnetic waves radiated in other directions are reflected by the reflector 5 and the auxiliary reflector 12.
Is reflected by, passes through the transparent plate 4, and reaches the inner pot 3. On the outer surface of the inner pot 3, electromagnetic waves are selectively absorbed by the film 1.
The wavelength is well matched with 0, absorbed by the inner pot 3, converted into heat, and conducted to the inner surface. Moreover, a part of the absorbed heat rays is radiated to the heat insulating layer 7 as radiant heat. However, this radiant heat is reflected by the transmission plate 4 and returned to the inner pot 3 to contribute to the heating of the inner pot 3 again, so that the heat is not released to the outside and the heating efficiency is improved.

On the inner surface of the inner pot 3, the far-infrared radiation film 11 radiates heat, and the heat heats rice and water to cook rice. In this way, almost no heat is radiated from the outer surface of the inner pot 3 and convective radiation of heat by the heat insulating layer 7 is prevented, so that uniform heating can be performed with high efficiency, and a high thermal power is obtained. Therefore, the rise of temperature rise to the water absorption region during rice cooking becomes faster, the temperature in the water absorption region can be made uniform and the temperature range can be reduced, and the rice can sufficiently absorb water. Then, the rise in temperature rise to the rice cooking area is accelerated, the cooked rice is cooked by uniform temperature heating, and the starch is gelatinized,
Starch can be completely pregelatinized in the Murashi area to make delicious cooked rice.

Therefore, since the transmission plates 4 along the shape of the inner pot 3 are arranged between the inner pot 3 and the halogen heater 2 with a space therebetween, convective radiation of heat due to space heat insulation is prevented. Highly efficient and uniform heating can be performed, and the inner pot 3 can be heated with high thermal power. Therefore, even in the rise of heating, heating rate, responsiveness, and cooling rate from a predetermined temperature, heating along the ideal rice cooking process curve becomes possible, and delicious rice can be cooked and kept warm.

Since the heating rate is high and uniform heating is possible, the plate thickness of the inner pot of the rice cooker can be reduced, and the weight and cost can be reduced. Also, since sufficient heating can be performed using a glass container, iron kettle, or stainless steel kettle that has poor thermal conductivity, it is possible to replace the aluminum material that has been commonly used in the past and improve the design and taste. Will be possible by examining structures other than materials. Furthermore, in terms of the weight of the entire product, since it is not necessary to use a sheathed heater and a heating plate having a large heat capacity, and a heavy induction coil is not used, a significant weight reduction can be achieved.

Although the minimum function as a cooking device can be achieved without a transparent plate, for example, Japanese Utility Model Publication No. 4-52567.
As described in Japanese Patent Publication No. JP-A-2003-264, the heat-resistant glass cover is provided above the rod-shaped far infrared heater and the reflector is provided below the heater, so that the heater is prevented from being contaminated. Due to the presence of the heater, it is possible to prevent damage to the heater and improve the cleaning performance around the heater. However, the reflector of the above publication does not have a function of forming a heat insulating layer like the reflector of the present invention to prevent radiant heat from escaping to the outside.

(Second Embodiment) The heating cooker of this embodiment is
As shown in FIG. 2, an electric pan is used, which includes a pan body 20, a heater 21, a cooking pan 22 as a cooking container, a transmitting plate 23, and a reflecting plate 24.
It is composed of a heat insulating layer 25. Each component is the same as that of the rice cooker of the first embodiment, but the reflector 24
Is a corrugated auxiliary reflection plate 24a in which only the lower part of the heater 21 is integrated. In the figure, 26 is a pot lid and 2
7 is a temperature sensor.

In the case of such an electric pan, the heater 21
Even if is turned on and off, since the heat absorbed by the cooking pot 22 is sensitive to the intermittent radiation of electromagnetic waves, it is possible to create a condition that heats up quickly and is difficult to cool, so it becomes a pot with good heat retention, and After simmering and cooking, the uncooked food is added and the cooking is started with a quick response to the start-up heating, and continuous cooking can be performed without a gap. Therefore, the electric pan which has not been heretofore available can realize quick heating, improvement in heat efficiency and heat storage, and can achieve delicious simmering and cooking.

(Third Embodiment) The heating cooker of this embodiment is
As shown in FIG. 3, the electric jar pot is composed of a jar pot body 30, a heater 31, a pot 32 as a cooking container, a transmitting plate 33, a reflecting plate 34, an auxiliary reflecting plate 35, and a heat insulating layer 36. Each component is the same as that of the rice cooker of the said 1st Example. In the figure, 37 is a lid and 38 is a temperature sensor.

In this case, the heat insulation performance of the electric jar pot is improved by the transmission plate 33 and the heat insulation layer 36, and the heat insulation performance is similar to that of conventional vacuum heat insulation mahobin or hollow stainless steel vacuum container, and instantaneous heat generation by the heater 31 is possible. So
The temperature rises quickly when the temperature drops, improving the responsiveness of temperature control and providing an electric jar pot with highly efficient heating.

(Fourth Embodiment) The heating cooker of this embodiment is
It is an electric hot plate as shown in FIG. 4, and is composed of a hot plate body 40, a heater 41, a cooking plate 42 as a cooking container, a transmission plate 43, a reflection plate 44, an auxiliary reflection plate 45, and a heat insulating layer 46. Each component is the same as that of the rice cooker of the first embodiment, but the reflection plate 44 and the auxiliary reflection plate 45 are integrated, and since only the bottom surface of the cooking plate 42 needs to be heated, it is transparent. It is arranged only below the plate 43. In the figure, 47 is a lid and 48 is a temperature sensor.

In this electric hot plate, the rising temperature rise at the start of operation is fast, and the cooking plate 42 can be quickly raised to a predetermined temperature. It's hard to get cold. In addition, the heat retention after cooking the food on the cooking plate 42 is good, and when the food is continuously cooked, the temperature rise response when the food is placed on the cooking plate 42 is good,
You can cook continuously without waiting for cooking, and it will be a hot plate with high thermal power and good responsiveness.

Therefore, since the heating response is fast, the temperature drop of the cooking plate 42 due to the food can be immediately responded by the instantaneous heating of the heater 41, and the continuous heating and cooking can be performed by the quick heating response. In addition, a thick-walled aluminum-based cooking plate with a large plate thickness that has heat storage properties and a cast iron with a large specific gravity,
There is no need to use cooking plates made of stainless steel, copper, etc., high output electric capacity is not required, and weight reduction and cost reduction can be achieved. And since it is instantaneous heating, it is not a high temperature of 250 to 300 ° C but a low temperature of 20 in a thin cooking plate.
Even if heated at around 0 ° C, roasted meat can be cooked without smoking.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention. For example, instead of the halogen heater, a bright sheathed heater that emits an electromagnetic wave having a wavelength of 0.3 to 5.6 μm may be used. Further, the heater is not disposed only below the cooking container, but may be disposed laterally or above, or a plurality of heaters may be disposed.

[0035]

As is apparent from the above description, according to the present invention, a heater that radiates electromagnetic waves and a transmission plate that transmits electromagnetic waves are provided, and the transmission along the shape of the cooking container is provided between the cooking container and the heater. Since the plates are arranged at intervals, the electromagnetic waves from the heater are efficiently absorbed by the cooking container and converted into heat, and the output of the heater can be used without waste to achieve high thermal power. The space formed between the transparent plate and the permeation plate serves as a heat insulating layer to prevent convective radiation of heat for uniform heating, and it serves as a heating cooker with excellent quick heat retention and heat retention properties, enabling quick and delicious cooking finish. it can.

In particular, by applying a surface treatment on the outer surface of the cooking container to absorb electromagnetic waves and prevent heat radiation, the electromagnetic waves from the heater can be wavelength-matched well on the outer surface of the cooking container, resulting in a synergistically high effect. Since efficient heating can be performed and heat radiation from the outer surface can be eliminated, more efficient heating can be performed. In addition, by applying a heat radiation coating to the inner surface of the cooking container to radiate heat, the heat absorbed in the cooking container can be efficiently transferred to the food, and delicious cooking can be performed.

By forming the transparent plate made of a transparent material having heat resistance and impact resistance into a shape similar to that of the cooking container, it is possible to prevent heat from being radiated to the outside and to enhance the heat insulating property of the cooking container. Moreover, since it is strong, it will not be damaged even if it hits, and it can withstand long-term use. Also, since it is between the cooking container and the heater, it prevents the heater from being directly impacted and so on, which helps prevent damage to the heater, and also prevents the juice of the cooking product from adhering to the heater. It is possible to prevent a decrease in efficiency due to contamination. In this way, the heater can be protected to prolong the service life, and the reliability can be maintained for a long period of time.

Further, by providing a reflection plate for reflecting the electromagnetic wave from the heater in the direction of the transmission plate, the radiation directivity of the electromagnetic wave emitted from the heater can be improved and can be effectively utilized without waste, and high thermal power can be obtained. As a result, uniform heating can be achieved, and highly efficient heating can be achieved. Furthermore, since there is no heat radiation from the reflector to the outside, it is possible to prevent the risk of burns when the heating cooker body becomes hot and touches the body.

As described above, since it is possible to provide a heating cooker with high heat efficiency, high efficiency, and uniform heating, it is possible to prepare various types of cooking such as rice cookers, jar rice cookers, electric pans, jar pots, and hot plates. It can be applied to a vessel and cooked with a delicious finish according to each application. Moreover, since the heating rate is high and uniform heating is possible,
It is possible to change the material of the cooking container that has been conventionally used, and it is possible to reduce the weight and the cost. Further, since the heater, the cooking container, and the transmission plate are arranged with a space in between, the design can be easily changed to a shape that enables highly efficient heating, and the size and weight can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a rice cooker according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the electric pan of the second embodiment.

FIG. 3 is a sectional view of an electric jar pot of a third embodiment.

FIG. 4 is a sectional view of an electric hot plate according to a fourth embodiment.

FIG. 5 is a diagram showing an ideal rice cooking process curve showing the relationship between rice cooking time and temperature.

[Explanation of symbols]

 1 Rice Cooker Main Body 2 Heater 3 Inner Pot 4 Transmission Plate 5 Reflector 7 Heat Insulation Layer 10 Selective Absorption Film 11 Far Infrared Radiation Film 12 Auxiliary Reflector

Claims (5)

[Claims] 1. A heater for radiating an electromagnetic wave, a cooking container for absorbing the electromagnetic wave, and an electromagnetic wave transmitting plate disposed with a space between the cooking container and the heater, respectively. Heating cooker. 2. A heater that radiates visible, near-infrared, and infrared electromagnetic waves; a cooking container that has an outer surface facing the heater that is surface-treated to absorb the electromagnetic waves and prevent heat radiation; A heat cooker, comprising: a heat-resistant transparent plate that transmits electromagnetic waves, wherein the transparent plate is arranged between the heater and the cooking container with a space therebetween. 3. The heating cooker according to claim 1, wherein the transparent plate is made of a transparent material having heat and impact resistance and has a shape similar to a cooking container. 4. The cooking device according to claim 1, further comprising a reflection plate provided outside the heater for reflecting electromagnetic waves from the heater toward the transmission plate. 5. The heating cooker according to claim 1 or 2, wherein the cooking surface of the cooking container is provided with a heat radiation coating for heat radiation.