KR20190006288A - Planar heat element for electric cooking device - Google Patents

Abstract

The present invention relates to a cooking device using a planar heating element. More specifically, the cooking device uses a planar heating element which includes: a microcomputer control unit controlling a power control unit and a temperature sensor; spiral-shaped band-type carbon fibers made of a carbon fiber material and arranged in plural; and an aluminum heat sink supporting the planar heating element from the lower side and transferring thermal energy of the planar heat element only in an upward direction. The cooking device includes: a body part formed by joining an aluminum plate material or aluminum and stainless steel, and by being rolled to plastic deformation on the outer circumferential surface; a lower side planar heating element transmitting the thermal energy to a lower side of the body part; and a side planar heating element transmitting the thermal energy to a side surface portion of the body part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooking apparatus using a planar heating element,

[0001] The present invention relates to a cooking apparatus using an area heating element, and more particularly, to a microwave oven having a microwave control unit for controlling a power supply control unit and a temperature sensor, comprising a plurality of spiral- And an aluminum heat dissipating plate for supporting the surface heat emission element at a lower portion thereof and allowing the exothermic energy of the surface heat emission element to be transmitted only in an upward direction, characterized in that an aluminum plate or aluminum and stainless steel are joined, A body portion rolled to be deformed; A lower side surface heating element for transmitting thermal energy to a lower side of the body part; And a side surface heating element for transmitting heat energy to the side surface of the body part.

BACKGROUND ART [0002] Generally, an electric heat-preserving rice cooker is an electric appliance that uses rice as a heat source to heat rice, and includes an inner pot in which food such as rice is received, a body in which the inner pot is seated, And an electric heating device for heating the electric motor.

When the inner pot is heated by the electric heating device for a predetermined time, the rice housed in the inner pot is cooked, and the cooked cooked rice is maintained at a constant temperature to maintain the temperature of the cooked rice so that the user can always eat it.

The temperature of the inner pot is maintained at around 74 ℃ during general warming because it can eat warm rice and keep the best taste for a certain time after the first cooking is finished.

However, when the temperature of the inner pot is maintained at 74 캜 for a long time during warming, not only the taste of the rice is lowered but also the rice is dried and the color of the rice is changed to yellow.

For example, it is difficult to maintain the stickiness of rice for more than one day because the starch content of the rice changes and the taste deteriorates when the heat is kept for a long time. After about 20 hours, the stamina goes crazy and gradually becomes harder, and after about three days it becomes yellowish and hard, making it hard to eat.

Electric pressure rice cooker is divided into heating plate type and IH type. In the heat plate type, there is a device that generates heat at the lower part of rice cooker, and it is similar to the principle of cooking rice cooked on a gas fire or an inverter by heating the pot from below.

In the IH (Induction Heating) method, the coil is wrapped inside the rice cooker, and the rice cooker is heated as a whole through the induction current. Compared to the heat plate type, the heat can be transferred evenly, so the taste of the rice is better, and the rice does not stick to the rice cooker and is easy to clean.

However, since only the lower portion of the inner pot is heated, the amount of heat lost to the upper end of the inner pot is increased, and the amount of heat transferred to the object to be cooked is reduced, and proper voltage is applied and maintained at a proper temperature There is a problem that it is difficult to adjust the temperature optimum for the warming and cooking of the food.

Korean Patent Publication No. 2015-0022520 Korea Patent Publication No. 2016-0033937 Korean Patent No. 0760706 Korean Patent No. 1340648

The present invention has been conceived in order to solve the above-mentioned problems, and it is an object of the present invention to provide a cooking method and a cooking method using a surface heating element which can consume electricity with a high heat- The purpose of the device is to provide.

Another object of the present invention is to provide a cooking apparatus using a planar heating element using a heat flow reduction phenomenon in which rice is heated by putting the heating wire on the side rather than under the heating wire.

According to an aspect of the present invention, there is provided a microcomputer control unit for controlling a power supply control unit and a temperature sensor, comprising: a plurality of spiral carbon fiber strips of carbon fiber material; And an aluminum heat dissipating plate for allowing the exothermic energy of the planar heat generating element to be transmitted only in an upward direction. The cooking device includes an aluminum plate or aluminum and stainless steel joined to each other, ; A lower side surface heating element for transmitting thermal energy to a lower side of the body part; And a side surface heating element for transmitting heat energy to the side surface of the body portion.

And an aluminum heat dissipating plate for transferring heat energy of the lower side or the side surface heating element to only the upper side.

And a thermal step is formed by applying a voltage difference to the surface heat emission elements of the heat flow reduction portion provided on the upper side of the side surface heat emission element.

The lower or side surface heating element may be formed of at least one of aluminum (Al), silicon (Si), magnesium (Mg), zirconium (Zr), tungsten (W), zinc (Zn), titanium (Ti) (Mn), bismuth (Bi), tellurium (Tl), niobium (Nb), hafnium (Hf), indium (In), tin (Sn), copper (Cu), cobalt And a metal precursor including at least one metal selected from the group consisting of iron (Fe), molybdenum (Mo), nickel (Ni), and alloys thereof.

The lower side or side surface heating element is composed of 3 to 6 parts by weight of carbon nanotube particles, 0.5 to 30 parts by weight of carbon nanoparticles, 10 to 30 parts by weight of a mixed binder, 29 to 83 parts by weight of an organic solvent And 0.5 to 5 parts by weight of a dispersant.

According to the present invention, The heat transfer rate from the lower portion to the upper portion of the side portion is reduced according to the thermal flow reduction system so that heat is substantially confined to the lower side of the inner pot so that the amount of heat lost to the inner pot top is reduced and the amount of heat transferred to the object to be cooked is increased The thermal efficiency can be improved with less energy.

In addition, the present invention consumes a lot of electricity with a warming function than when cooking rice. In order to lower the electric charge, it is preferable to use a low temperature keeping function, refrigerate and refrigerate, and heat it in a microwave oven when necessary. The present invention can maintain a temperature of about 60 degrees at a minimum electric power. Can be prevented.

Further, according to the present invention, when the rice is cooked with good processability of the surface heat emission element, the surface heat emission element is not used only on the bottom portion, but is attached to the side surface, thereby making the rice better.

In addition, since the present invention can be cooked in a short time every day with a small amount of electric power, it does not cause any harm in terms of nutrition, increases the taste of rice, and greatly improves the absorption rate, thereby contributing to obesity.

Also, in the present invention, when the user selects the saving mode by selecting the saving mode and inputs the desired time through the key setting, the user recognizes the time inputted by the user and the current time, It is possible to maintain the temperature at about 60 ° C. by applying a proper voltage to the surface heating element so as not to cause odor and to keep the temperature close to the normal keeping temperature by using various control methods in the microcomputer control section 30 minutes before the user wants to eat So that the power consumption can be reduced and the performance can be improved.

In addition, according to the heat flow reduction method which can be easily implemented by using the surface heating element, the present invention can make steamed bread such as sikhye, galbi steam, potato or sweet potato as well as rice in addition to rice.

1 is a view showing the concept of a line heating element according to the prior art.
2 is a view showing the concept of a planar heating element according to an embodiment of the present invention.
FIG. 3 is an overall configuration diagram according to an embodiment of the present invention.
4 is a view showing the configuration of a planar body and an aluminum heat sink according to an embodiment of the present invention.
5 is a view showing an appearance of an electric pressure cooker according to an embodiment of the present invention.
6 is a view illustrating the use of a side surface heating element for reducing heat flow according to an embodiment of the present invention.
7 is a view showing a user interface of the thermosensitive cooker according to an embodiment of the present invention.
8 is a view showing a planar heating element capable of supporting a bottom surface of a body part according to an embodiment of the present invention.
9 is a view showing a configuration of an electric port according to an embodiment of the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Further, detailed descriptions of well-known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

As shown in FIGS. 2 and 3, the planar heating element 210 manufactured according to various embodiments uses a nano carbon heating element coating liquid which can be heated up to 200 degrees for about 5 seconds. A detailed description thereof will be described later.

When the water is boiled at a temperature of 100 ° C and the food is cooked, it must be heated to 200 ° C or more. The planar heating element 210 uses carbon graphite or the like so that it can be heated to 250 ° C within 10 seconds. Consumption current can be operated within 200 ~ 300W and temperature can be finely controlled.

The power supply control unit 51 and the temperature sensor 52 are connected to the planar heating element 210 according to the present invention and a microcomputer control unit 53 for controlling the power supply control unit 51 and the temperature sensor 52 is provided.

The power supply control unit 51 is further connected to the planar heating element 210 to stably control the power supply, thereby replacing the existing bimetal.

The microcomputer control unit 53 generates a control command for a predetermined amount of current to apply a small amount of constant current to the planar heating element 210 to quickly and efficiently heat the planar heating element 210 A TPR (Thyristor Power Regulator) that controls the power at a predetermined stage can be used.

As shown in FIG. 4, the present invention includes a plurality of spirally wound strip-shaped carbon fibers, which are made of a carbon fiber material, and are supported at a lower portion of the planar heating element 210, And an aluminum heat dissipating plate 250 for transmitting only the upward direction.

The aluminum heat dissipating plate 250 has a convex shape or a concave shape so that heat is easily gathered or spread in a certain direction by canceling the property of bending while supporting the flexible surface heat emission element 210, And can be fixed to one end of the surface heat emission element 210 by a heat resistant adhesive or the like.

5, in an embodiment of the present invention, a home power supply unit of the power supply unit is a unit that receives a voltage of 220 V for use in a home power supply 220 V, and the outdoor power supply unit is an outdoor power supply unit, It is the part to receive the voltage to be able to use 5V ~ 12V.

The present invention can be conveniently used outdoors by using an area heating element which can be heated by a current of less than 1/10 of that of a general electric pressure cooker.

In addition, it can induce high heat with low voltage, so it can be cooked by electric power accumulated by using other battery or solar heat in outdoor.

In addition, when rice cooked mainly in Korea is heated constantly for a long time, the problem of usage is improved by using a surface heating element which can heat the electric power with a very high electric current less than one tenth.

6 (a), it is preferable to be formed by rolling to plastic deformation on the outer circumferential surface of the body portion 200 in order to reduce heat flow. The object to be cooked W accommodated in the body 200 is heated from a portion contacting the inner circumferential surface of the body 200 and the heated inner circumferential surface side object is caused to flow from the lower side to the upper side due to the high temperature.

Then, the object to be heated upward flows to the lower side through the center side to form a flow through which the heat is transferred to the entire object to be cooked.

At this time, since the outer circumferential surface of the body 200 is recessed inward to reduce the heat flow and the inner circumferential surface is substantially flat, a convection process in which the heated cooking object w is heated and flows along the inner circumferential surface of the inner pot So that the heat can be rapidly transferred to the entire object to be cooked.

In order to reduce the heat flow, it is preferable that the outer circumferential surface of the body portion 200 is rolled so as to be plastic deformed.

Here, the body part 200 may be formed of an aluminum plate material or a stable material that is made of aluminum and stainless steel joined together and is resistant to heat and which does not generate harmful substances to the human body.

6 (b), it is preferable that the lower surface of the lower surface of the side surface heating element 210 is formed within a height range of 30 to 60% Do.

Accordingly, even when the volume of the object to be cooked w filled in the body 200 is small due to the reduction of the heat flow, efficient heating is enabled, and the quality of the product can be improved by reducing the cooking time and improving the cooking quality .

More specifically, when the cooking object w having a content of more than 60% is accommodated, the area contacted by the side surface of the body part 200 and the object to be cooked w is wide. Therefore, the amount of heat lost to the top of the body part 200 The amount of heat transferred from the bottom portion of the body portion 200 is larger than that of the body portion 200. Therefore, according to the observed experimental results, it can be seen that between 30% and 60% When a plurality of separate surface heat emission elements 210 connected to each other is formed, the heat toward the upper side is cut off and the thermal energy is transferred to the lower side, so that the most remarkable rise in the thermal efficiency is shown.

The surface heating element 210 may be formed at the uppermost point of the heat flow reduction part 204 provided on the upper side of the side surface heating element 210. The surface heating element 210 ), A higher thermal efficiency was obtained.

This is because the present invention can be applied to change the voltage freely and apply a voltage of 12 V or less to the highest point of the heat flow reduction unit 204 to easily maximize heat flow reduction.

In addition, a voltage difference may be applied to the surface heat emission elements 210 attached to multiple rows of the heat flow reduction section 204 to cause heat flow reduction phenomenon, and it is possible to perform an easy thermal boundary treatment of the heat flow reduction section 204, Can be improved.

In addition, since the temperature boundary is clearly expressed due to the step difference of the carbon heating element layer, the temperature of the carbon heating element layer is different from that of the carbon heating element layer, The efficiency can be increased.

Of course, the portion formed for reducing the heat flow is not limited to one portion on the upper side of the position corresponding to the heat generating portion, but may be arranged in multiple stages.

In addition to rice, it is possible to make steamed bread such as sikhye, galbi steam, potato and sweet potato, as well as bread. Even cakes and casteras are more moist and delicious in a rice cooker using heat energy generated to reduce heat flow rather than ovens.

FIG. 7 is a view showing a screen of a user interface of an electrothermal cooker of the present invention.

When the reservation button shown by A of the key input unit 110 is pressed in the activated state of the warm / reheat button C, that is, in the normal keep-warm mode, the saving insulated B of the display unit 20 is turned on , And a time at which the saving and keeping time can be set is displayed on the display unit 20.

When the user sets the time by turning the jog dial unit 120, the microcomputer control unit 53 calculates the difference between the time set by the user and the current time, and displays the remaining time of the saving warm-up time on the display unit 20 .

Although the saving heat insulation setting has been described by way of example only in the case where the thermosensitive cooker is currently in a thermostated state, it is possible to perform both of the reheating mode and the standby mode. During normal warm-up, the warm / reheat button C area and the warm-up time display area of the display unit 20 are lit or activated in the user interface. On the other hand, during the saving and warming, the area for the warm / reheat button C is activated, and the saving warmth (B) and the saving and keeping display area of the display unit 20 are activated.

Accordingly, the microcomputer control unit 53 allows the temperature to rise at a specific time even if the power is turned on by activating the cooking reservation time setting function, and gradually raises the temperature before a certain time, You can also control to slow down before.

8, the upper surface of the planar heating element 210 may be formed in a shape that can support the bottom surface of the body 200. In particular, the upper surface of the planar heating element 210 may have an outer surface, And the central portion of the upper surface of the planar heating element 210 is formed to be spaced from the bottom surface of the body 200 without contacting the bottom surface of the body 200.

The contact member 42 may be formed of a heat resistant material so as to be in close contact with a bottom surface of the body 200. The contact member 42 may be formed of a material having a high thermal conductivity, A curvature corresponding to the curvature of the bottom surface of the body part 200 that is in contact with the contact member 42, and is formed in a donut shape as a whole.

The contact member 42 is formed in a ring shape surrounding a plurality of the planar heating elements 210 and is inserted into the planar heating element 210 to heat the planar heating element 210. [ The contact member 42 can be intensively heated by the heat generated by the heater 50. [0050] As shown in FIG.

The outer surface of the bottom surface of the body portion 200 contacting the contact member 42 may have a relatively higher temperature than other portions of the bottom surface of the body portion 200.

Therefore, the upper surface of the planar heating element 210 can be formed so as to be inclined downward from the outer side of the planar heating element 210 along the center direction. Therefore, the upper surface of the planar heating element 210 and the upper surface of the body 200, The distance from the bottom surface increases toward the center of the planar heating element 210.

A portion of the bottom portion of the body portion 200 placed on the upper surface of the planar heating element 210 comes into contact with the contact member 42 and is most likely to receive heat from the planar heating element 210, Thereby maintaining a high temperature.

Accordingly, the inside of the body part 200 has a higher temperature from the central part to the outer part of the body part 200, so that the food stored in the body part 200 is totally contained in the body part 200, A convection phenomenon can be actively generated from the outer periphery of the partition wall to the central portion.

In addition, since the convection phenomenon of the food is actively generated as described above, the heat can be uniformly transmitted to the food, and the cooking quality can be improved.

As an embodiment of the present invention, proportional, derivative, integral (PID) calculation is performed according to a control deviation with respect to a value obtained by feedback and digital conversion of a signal output from the microcomputer control unit 53 in order to heat the surface heating element 210 The microcomputer control unit 53 controls the surface heating element 210 to output a control signal through an operation to control the surface heating element 210. When a reverse rotation occurs in which an excessive load is applied or repulsive to the surface heating element 210, And a PLC control unit for controlling the heating element 210 to a low load mode in which the heating element 210 is intermittently operated for a predetermined period of time.

The control operation of the PID central control unit according to the present invention controls the target value of the last data held within a predetermined range. When it is determined that the PID does not remain within the predetermined range, the control unit returns data to the target value or less.

To this end, the present invention collects data for analysis and processing, forms a database, and determines the optimal power supply of the surface heat emission element 210 quickly without requiring an iterative process for processing through the database information.

It is possible to PID control the optimal power supply of the planar heating element 210 through the microcomputer control unit 53 based on the database through the PID control module.

The PID control module may be configured to apply a preheating power to the PID control module in order to control in real time to reduce the power supplied to the surface heating element 210 for the termination of the power application for a predetermined time around the point of time when the operation of the surface heating element 210 is completed. The power source of the planar heating element 210 is slowly turned on by a phase control method for a predetermined time after a predetermined time, the power is turned off after a certain time for the planar heating element 210 to completely cool, and the phase control method of the phase control part The surface heat change of the body portion 200 according to the temperature can be minimized by slowly turning on / off the surface heating element 210 before or after a time when the food is cooked according to the phase control method.

In addition, the PWM control module controls the microcomputer control unit 53 to generate a constant control voltage by using the PWM pulse width modulation method, and can maintain a constant pulse voltage to prevent various current signals that may occur during operation from bouncing.

Accordingly, the present invention adjusts the proportional, differential, integral (PID) operation, and TPR (Thyristor Power Regulator) without adjusting the size of power supplied in the prior art. No need to reduce manufacturing costs and increase durability.

As shown in FIG. 9, the multifunctional wireless electric port 100 according to an embodiment of the present invention includes a body 200 having a space for receiving contents therein, a control unit for controlling the heating wires and the power supply, A heating unit 120, and a handle coupled to one side of the body 200, and a body 200 inside the body.

More specifically, the body 200 is made of stainless steel, and has a cylindrical shape so that water, ramen, simple food, etc. can be received therein. On the outer surface of the upper part, An outlet is formed.

The surface heating element 200 described above is for heating the bottom of the body part 200 and includes a heating wire and a control part inside. A connection port for receiving power is formed in the center of the outer bottom, A power switch for operating the port and a function switch for setting the function according to the purpose of use.

Here, the heating wire is heated by electric power supplied from the outside to heat the bottom of the body part 200, so that the water contained in the body part is boiled or food such as ramen is cooked. A connection port 221 is formed on a bottom plate corresponding to the heating unit 120 to supply electric power to the heating line, and the connection port 221 is electrically connected to supply electric power to the heating line.

The power switch 122 is a main switch for turning on / off the power supply to the heating wire in a state where the connection port 221 is electrically connected.

The voltages supplied to the heating wires are changed according to the selection of the function switches 123. In the case of the first and second function switches, a voltage of 12 V or less is supplied, and in the case of the third function switch, . At this time, 12 V or less voltage will be used for 12 V connector. The selection of 12V and 220V according to the present invention is dependent on whether indoor or outdoor, and the time to rise to a certain temperature is the same when the planar heating element 210 according to the present invention is used.

The heating unit 120 is provided with a control unit for supplying and blocking electric power to the heating wires according to the respective function switches 123. The control unit includes a temperature sensing sensor and a timer to cook the contents contained in the body 200, The control unit adjusts the voltage of the surface heat emission element 200 after a predetermined time has elapsed in order to prevent the electric port 100 from overheating.

Meanwhile, as an embodiment of the present invention, the carbon nanotube layer constituting the planar heating element 210 may be formed by attaching carbon, especially carbon nanotube (CNT), to the base layer. Carbon nanotubes have a hexagonal shape consisting of six carbon atoms connected together to form a tubular shape.

The electrical conductivity of carbon nanotubes is 100 to 1,000 times greater than that of copper. The thermal conductivity is the same as that of natural diamond, and its strength is 100 times better than steel. Carbon fibers can be broken even when only 1% is deformed, while carbon nanotubes can withstand 15% deformation. In addition, carbon nanotubes have excellent exothermic properties.

The surface heating element 210 including the carbon nanotubes has a large amount of far-infrared rays, so that an object in the accommodation space S can have a health-friendly ingredient in the course of cooking. Furthermore, the carbon nanotube layer has a remarkably low generation of electromagnetic waves, which also has the advantage of being able to compensate for the disadvantages of the conventional electric heater.

The nanomaterial-coated surface heating element constituting the surface heating element 210 according to the present invention is a heating element which overcomes the disadvantages of a surface heating element coated with a particle unit material having a small specific surface area, It has a nano-sized surface with a small specific surface area compared to its weight and has a wide surface area that exchanges heat with air, so that the heat generated from the entire surface of the nanomaterial-coated thin layer is uniformly dissipated, The conductive nanomaterial is a mixture of a functional material that emits nano-sized far-infrared rays and anions and conductive carbon (carbon) with a high degree of heat, a high thermal durability, a low thermal expansion coefficient, The far-infrared radiation emitted is fast and uniformly diffused, It is a synthetic resin polymer that will form insulation coatings. It also has insulation effect and insulation effect in addition to protection function of heating element. Flexible and strong, it is easy to cut when using. It is possible to improve the stability and durability of preventing the danger due to no disconnection or short circuit.

The nanomaterial-coated thin film layer formed on the cylindrical tube-shaped nano-coated surface heating element 210 constituting the planar heating element 210 according to an embodiment of the present invention may be a polymer nanomaterial, such as a nanometer-scale inorganic binder of carbon or ceramic component, The surface temperature of the nanotubes coated with the nanotubes of the cylindrical tube-type nano-coated surface heating element is increased by the heat generated by the surface of the nanotubes coated with the conductive transparent coating liquid. The nanomaterial coated thin film layer formed without the short-circuiting of the cylindrical tube-shaped nano-coated surface heating element has a heat generating effect of the nano-coated coil of the prior art (nichrome coil method) Compared to the heating element configuration, I would be being able to contribute to improved indoor air quality by emitting far infrared radiation beneficial to the human body.

In an embodiment of the present invention, the nano-carbon heater forming the planar heating element 210 is a heating element provided with a nano-carbon in a tube such as a quartz tube or a ceramic tube. Such a nano-carbon heater is supplied with power by an ordinary power supply unit and a control unit installed inside the body, and emits near-infrared rays.

The reflector reflects the heat generated from the nano-carbon heater to the front of the body. The reflector covers the entire nano-carbon heater on the rear side of the nano-carbon heater.

As an embodiment of the present invention, the carbon nanotube may include a metal precursor constituting the planar heating element 210.

The metal precursor may be at least one selected from the group consisting of Al, Si, Mg, Zr, W, Zn, Ti, Cr, Mn, (Bi), tellurium (Tl), niobium (Nb), hafnium (Hf), indium (In), tin (Sn), copper (Cu), cobalt (Co), lead (Pb) And at least one metal selected from the group consisting of molybdenum (Mo), nickel (Ni), and alloys thereof.

The amount of the metal precursor is preferably 0.1 to 200 parts by weight based on 100 parts by weight of the carbon nanotubes constituting the planar heating element 210.

On the other hand, the material of the heating element of the planar heating element 210 can be divided into a metal heating element, a non-metallic heating element, and other heating elements. The mainstream of the initial heating element was a rod-type heater using a metal heating element such as Fe-Cr-Al system, NI-Cr system, high melting point metal (platinum, Mo, W, Ta etc.) and charged inorganic insulators such as MgO There is a surface of a metal tube surface treated with far infrared ray emitting material. As the non-metallic heating element material, silicon carbide, molybdenum silicide, lanthanum chromite, carbon, zirconia and the like are used. As other heating elements, a direct current type heating element using a ceramic material, barium carbonate, thick film resistance, or the like is used.

The planar heating element 210 may include a metal heating element formed by etching a metal thin plate such as iron, chromium, nickel, or platinum in a direct current type using a thick film resistor, and a non-metallic heating element such as silicon carbide, zirconia, or carbon. In addition, the polymer insulating material is coated with carbon black (carbon black) and carbon fiber excellent in far-infrared ray radiation characteristic, and a heating element using carbon fiber is woven. Carbon is characterized by heat and durability, good thermal conductivity and low thermal expansion coefficient.

Also, carbon is widely used because it is easier to manufacture and less expensive than etching a metal heating element.

In most of the metallic or carbon-based fillers used as the filler of the planar heating element 210, oxidation problems due to reaction with oxygen occur as the temperature of the filler increases.

 That is, in the case of metal, formation of oxide by oxidation and carbon in case of carbon cause deterioration (degradation) of CO gas, resulting in change of electrical conductivity property, resulting in modification of characteristic of heating element.

For this reason, surface heating elements using metallic or carbon-based fillers have limitations in application to low-temperature heating / household applications.

Meanwhile, the lower or side surface heating element 210 according to the present invention may contain 3 to 6 parts by weight of carbon nanotube particles, 0.5 to 30 parts by weight of carbon nanoparticles, 10 to 30 parts by weight of a mixed binder, 29 to 83 parts by weight of an organic solvent, and 0.5 to 5 parts by weight of a dispersant.

The lower or side surface heating element may include a heating layer having a hybrid form of zinc oxide nanowire and ITO (Indium Tin Oxide) nanoparticles, and may include a hybrid type such as the heating paste composition.

In addition, the planar heating element according to the present invention is covered with an oxide film formed by plasma oxidization (PEO) in one embodiment, and the plasma electrolytic oxidation method is a method in which the plasma arc oxidation technique or the plasma dissolution technique Coating and surface treatment technology to form an oxide film on a metal base material such as magnesium (Mg), aluminum (Al), and titanium (Ti).

In the plasma electrolytic oxidation method, a high voltage of several hundreds of volts is applied between a metal (anode) charged in an alkali electrolyte solution and a stainless steel electrode (cathode) to form a plasma reaction on the surface of the metal base material to form a hard oxide film.

In addition, the plasma electrolytic oxidation method can form an oxide film having a thickness and properties to the extent that it can not be manufactured by a conventional method such as anodizing, electroplating or plasma spray coating, and using a weak alkaline electrolyte solution It is an environmentally friendly construction method.

20:
42:
51:
52: Temperature sensor
53: Microcomputer control unit
110: key input unit
120: Jog dial part
200:
204: Heat flow reduction section
210: Planar heating element
250: Aluminum heat sink

Claims (5)

And a microcomputer control unit for controlling the power supply control unit and the temperature sensor, wherein a plurality of spiral carbon fiber-shaped carbon fibers, which are made of carbon fiber material, are arranged and supported at the lower portion of the planar heating element, In the case of a cooking apparatus using an area heating element constituted by an aluminum heat sink plate which is provided only in the direction of the surface,
A body portion formed by joining an aluminum plate material or aluminum and stainless steel and being rolled to plastic deformation on the outer circumferential surface;
A lower side surface heating element for transmitting thermal energy to a lower side of the body part;
And a side surface heating element for transmitting heat energy to the side surface of the body part. The method according to claim 1,
Further comprising: an aluminum heat dissipating plate for transferring heat energy of the lower side surface or the side surface heating element only in the upward direction. The method according to claim 1,
And a stepped portion is formed by applying a voltage difference to the surface heat emission elements of the heat flow reduction portion provided on the upper side of the side surface heat emission element. The method according to claim 1,
The lower side surface or the side surface heating element,
(Al), silicon (Si), magnesium (Mg), zirconium (Zr), tungsten (W), zinc (Zn), titanium (Ti), chromium (Cr), manganese (Mn), bismuth (Ti), niobium (Nb), hafnium (Hf), indium (In), tin (Sn), copper (Cu), cobalt (Co), lead (Pb), iron (Fe), molybdenum , Nickel (Ni), and an alloy thereof. The cooking apparatus using the planar heating element according to claim 1, wherein the metal precursor comprises at least one metal selected from the group consisting of nickel (Ni) and alloys thereof. The method according to claim 1,
The lower side surface or the side surface heating element,
3 to 6 parts by weight of carbon nanotube particles, 0.5 to 30 parts by weight of carbon nanoparticles, 10 to 30 parts by weight of a mixed binder, 29 to 83 parts by weight of an organic solvent and 0.5 to 5 parts by weight of a dispersing agent are mixed with 100 parts by weight of an exothermic paste composition And a cooking device using the planar heating element.

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