KR20160087655A - Electric cookware and the method therefor - Google Patents

Abstract

The present invention relates to an electric cookware in which a bimetal sheet can open or close an air supply port in a lower floor surface of an outer container of the electric cookware according to a set temperature in the electric cookware such that the electric cookware can be opened or closed to a temperature setting that enables an increase in thermal insulation efficiency, and to an automatic open/close method. The present invention is an electric cookware (100), wherein an air supply port (121) is formed in a floor surface of an outer container (120) of the electric cookware (100), and a bimetal sheet (200) enabling opening/closing of the air supply port (121) is installed in the lower portion of the outer container (120). The present invention is a method for automatically opening and closing an air supply port (121) of an outer container (100), wherein the method comprises: a step (S100) in which food is cooked by placing food to be cooked in an inner pot (110) of an electric cooker (100); a step (S200) in which, when the electric cookware (100) is heated such that the temperature increases to at least a set temperature, the air supply port (121) opens as a bimetal sheet (200) in the form of a thin plate is automatically curved by the hot air; a step (S300) in which, as the air supply port (121) opens, the outside air flows in to cool and prevent heating of the electric cookware (100); a step (S400) in which, when the food has been cooked and the set temperature has been reached, the bimetal sheet (200) opening the air supply port (121) is automatically straightened; and a step (S500) in which, as the bimetal sheet (200) has been automatically straightened, the air supply port (121) is closed, thereby shutting off the inflow of air.

Description

ELECTRIC COOKWARE AND THE METHOD THEREFOR [0002]

The present invention relates to an electric cooking apparatus and an automatic opening / closing method which are automatically opened and closed by a temperature setting, and more particularly, to a method and apparatus for automatically opening and closing a bimetal plate according to a set temperature of the electric cooking apparatus, The present invention relates to an electric cooking apparatus and an automatic opening and closing method capable of increasing the efficiency of heat insulation.

BACKGROUND ART [0002] Generally, an electric rice cooker is an electric appliance that uses electricity as a heating source to perform cooking, and includes an inner pot in which food (for example, rice) is received, a main body on which the inner pot is placed, An electric heating device for heating the inner pot, and the like.

That is, when the inner pot is heated by the electric heating device for a predetermined period of time, the rice housed in the inner pot is cooked, and the cooked rice is kept at a constant temperature for a predetermined period of time .

However, during the warming process, after the first cooking is completed, the warming for a certain period of time can maintain the initial taste of the rice to some extent, but the problem is that the taste of the rice is deteriorated over time or the color of the rice is changed, have.

That is, the reason why the taste of the rice is decreased or the color of the rice is altered in the warming process is because the keeping temperature is not maintained constant and the holding temperature is maintained higher than the preset holding temperature or the low holding temperature is maintained.

Further, when the lid of the rice cooker is opened for warm-up, the temperature of the inside of the rice cooker is rapidly changed due to the air introduced from the outside of the rice cooker, and rapid control of the outside air introduced into the inner pot can not be performed at this time.

In addition, there is a problem that the temperature difference between the upper temperature and the lower temperature of the rice stored in the electromagnetic cooker due to the opening and closing of the lid can not provide a uniform keeping performance of the electromagnetic cooker.

On the other hand, an environmental sensor for detecting the ambient temperature is provided outside the electromagnetic cooker, and a configuration for detecting the ambient temperature of the electromagnetic cooker from the ambient sensor and applying the temperature sensor to the warming temperature has been proposed.

Fig. 1 is a cross-sectional view schematically showing the configuration of an electromagnetic cooker, and Fig. 2 is a block diagram showing the configuration of a control circuit of the electromagnetic cooker of Fig.

1 and 2, an electromagnetic cooker includes a main body 10 having an electromagnetic cooker 1 and an inner pot 30 for accommodating rice, a lid 20 rotatably installed to open and close an upper portion of the main body, A first sensor 50 for detecting the temperature of the main body; a second sensor 51 for detecting the temperature of the bottom of the inner pot 30; A main heater 60, a side heater 61 and an upper heater 62 for providing a heat source for cooking and maintaining the rice cooker 1, a third sensor 52 for detecting an upper temperature of the rice cooker 1, An input unit 70 for receiving an operation signal of the rice cooker from a user, a display unit 80 for displaying an operation state of the rice cooker, and a data storage unit for storing an operation control program related to cooking and keeping of the rice cooker 90).

However, when the temperature of the upper pot and the lower pot of the inner pot 30 are changed according to the temperature of the main body 10 to improve the heating performance, accurate control is performed due to errors of the temperature sensors 50, 51, So that there is a problem that heat insulation failure occurs.

In addition, the conventional control of the warming temperature simply operates by controlling the warming up / down of the warming temperature, thereby causing a problem of insulation failure when the characteristics of the temperature sensor are changed at a certain temperature.

In addition, if the surrounding environment temperature is insufficient at a certain temperature, it is possible to solve the problem of insufficient insulation by merely adjusting the insulated temperature upwards and downwards. However, the insulated insolation occurs due to the changed insulated temperature at other surrounding environments .

Korean Patent Publication No. 10-2008-0101524 (published on November 21, 2008)

It is an object of the present invention to provide a bimetallic plate which can automatically open and close an air supply port according to a set temperature inside an electric cooking appliance, And an automatic opening and closing method and an automatic opening and closing method which are automatically opened and closed at a temperature setting for maximizing energy saving efficiency.

According to an aspect of the present invention, there is provided an electric cooking apparatus which is automatically opened and closed by a temperature setting, wherein an air supply port is formed on a lower surface of an outer cylinder of an electric cooking apparatus, Bimetallic plates may be installed.

The air supply port according to the present embodiment may be formed on at least one or more of the lower surface of the outer cylinder of the electric cooking apparatus.

Further, the air supply port may be formed on the lower surface of the outer tube, and may be opened to the outside of the electric cooking apparatus so that external air can be introduced into the outer tube.

The bimetallic plate according to the present embodiment can be bolted to the bottom surface of the outer cylinder.

An air opening / closing part may be provided at an end of the bimetallic plate to open / close the air supply port to control the flow of air.

In addition, the air opening / closing part may be formed on one end of the bimetallic plate or on both ends thereof.

The air opening / closing unit may be formed in a semi-circular shape or a balanced shape protruding downward so as to stably block the air supply port.

The bimetallic plate of the present invention may be formed in a thin plate shape to smoothly open and close the air supply port according to the heating of the lower seat heat plate to control the air flow.

According to another embodiment of the present invention, a second lower bottom portion having an air supply port formed in the lower portion of the outer cylinder is provided, and the air supply port is automatically opened and closed according to the temperature setting in the second lower portion. A bimetal plate can be installed.

A power bimetal temperature sensor may be installed on the bottom of the second lower cylinder so as to detect a temperature transferred to the bimetal plate and prevent a malfunction due to a rise in temperature.

According to another aspect of the present invention, there is provided a method for automatically opening and closing an air supply port of an electric cooking apparatus, comprising the steps of: preparing a cooked product by heating the inner pot of the electric cooking apparatus and heating the cooked product; A step of opening the air supply port while automatically bending the thin plate-shaped bimetal plate by the heat of high temperature when the temperature rises above the temperature; and a step of opening the air supply port to cool the electric cooking apparatus by heating Wherein the bimetallic plate is automatically balanced when the bimetallic plate is automatically balanced and the air supply port is automatically balanced when the bimetal plate is automatically balanced, And closing the sphere.

The temperature set in the electric cooking apparatus according to the present embodiment may be set to about 40 캜 to 90 캜.

Preferably, the temperature set in the electric cooking apparatus can be set to approximately 50 ° C to 80 ° C.

The step of opening the air supply port according to the present embodiment is a step in which when the electric cooking apparatus is heated at a set temperature of 40 ° C to 90 ° C for heating the cooked food, the bimetallic plate made of a thin plate structure is bent The air opening and closing part that blocks the air supply port opens the air supply port, so that the outside air flows into the inside of the outer tube, thereby preventing heating of the outer tube and preventing damage to the product.

In the step of closing the air supply port according to the present embodiment, when the cooking is finished, the electric cooking apparatus maintains the keeping temperature. When the internal temperature of the electric cooking apparatus is lowered to 40 ° C to 90 ° C, The inside of the outer tub of the cooking utensil is automatically closed while blocking the air supply port, thereby blocking the outside air, thereby enhancing the efficiency of keeping the inside of the cooking utensil.

According to another aspect of the present invention, an upper temperature sensor may be installed on the upper portion of the inner pot of the cooking utensil to detect the inner temperature of the inner pot so that the temperature can be set according to the cooking utensil when cooked in the inner pot is cooked.

Further, the upper temperature sensor may be inserted into the upper heater temperature sensor insertion tube.

A lower temperature sensor may be installed in the lower portion of the inner pot of the cooking utensil to sense the inner temperature of the inner pot so that the temperature can be set according to the cooking utensil when cooked in the inner pot is cooked.

Further, the lower temperature sensor may be inserted into the lower heater temperature sensor insertion tube.

A pot internal preset temperature sensor may be installed on the upper or sidewall of the inner pot of the cooking device to sense the temperature maintenance of the food and the reheating set temperature, respectively.

Also, the pot internal temperature sensor may be inserted into the pot internal temperature sensor pipe.

In the above, each temperature sensor can be connected to the control device installed in the cooking appliance by a wire.

As described above, according to the present invention, the bimetallic plate is provided to open and close the air supply port while a plurality of air supply holes are formed on the lower surface of the outer casing of the electric cooking appliance, so that the end portion of the bimetal plate is bent It is possible to open and close the air supply port, thereby preventing the heating of the electric cooking apparatus and increasing the efficiency of the thermal insulation at the time of warming, thereby maximizing the energy reduction efficiency.

1 is a cross-sectional view schematically showing a configuration of an electromagnetic cooker.
2 is a block diagram showing a control circuit configuration of the electromagnetic cooker of Fig.
3 is a cross-sectional view illustrating the interior of the electric cooking apparatus according to the present invention.
4 is an exploded perspective view of a bimetal plate provided on an outer cylinder of an electric cooking apparatus according to the present invention.
FIG. 5 is a perspective view of a bimetal plate provided on an outer cylinder of an electric cooking apparatus according to the present invention.
6 is an assembled perspective view showing another example of the bimetallic plate provided on the outer cylinder of the electric cooking apparatus according to the present invention.
7 is a sectional view of a bimetal plate provided on an outer cylinder of the electric cooking apparatus according to the present invention.
8 is a cross-sectional view illustrating an operating state of the bimetallic plate according to the present invention.
9 is a sectional view showing another example of the electric cooking apparatus according to the present invention.
FIG. 10 is a sectional view showing a state in which a bottom portion of the second lower cylinder is installed at the lower portion of the outer cylinder of the electric cooking apparatus shown in FIG. 9;
11 is a block diagram showing an automatic opening and closing method of the electric cooking apparatus according to the present invention.
12 is a sectional view showing the inside of another embodiment of the electric cooking apparatus according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is an exploded perspective view of a bimetal plate provided on the outer cylinder of the electric cooking apparatus according to the present invention. FIG. 5 is a perspective view of the electric cooking apparatus according to the present invention, 6 is an exploded perspective view showing another example of a bimetallic plate provided on the outer cylinder of the electric cooking apparatus according to the present invention, and FIG. 7 is a perspective view showing the electric cooking apparatus according to the present invention, FIG. 8 is a sectional view showing an operating state of a bimetal plate according to the present invention. FIG.

FIG. 9 is a sectional view showing another example of the electric cooking apparatus according to the present invention, and FIG. 10 is a sectional view showing a state in which a bottom portion of the second lower cylinder is installed in the lower portion of the outer cylinder of the electric cooking apparatus shown in FIG.

11 is a block diagram showing an automatic opening and closing method of the electric cooking apparatus according to the present invention.

12 is a sectional view showing the inside of another embodiment of the electric cooking apparatus according to the present invention.

Example  One.

3 to 8 illustrate an electric cooking apparatus 100 according to an embodiment of the present invention. As shown in FIG. 3 to FIG. 8, An air supply port 121 formed on a lower surface of the outer cylinder 120 in the electric cooking apparatus 100 and an air supply port 121 formed on a lower surface of the outer cylinder 120, And a bimetallic plate 200 to allow the bimetallic plate 200 to be formed.

The air supply port 121 according to the embodiment of the present invention is formed on the lower surface of the outer cylinder 120 of the electric cooking apparatus 100 so that at least one air supply port 121 is formed.

The air supply port 121 is formed on the lower surface of the outer cylinder 120 to communicate with the outside of the electric cooking apparatus 100 so that outside air can be introduced into the electric cooking apparatus 100.

That is, when outside air is introduced into the outer cylinder 120 into which the inner pot 110 for cooking food is inserted into the electric cooking apparatus 100, the heating temperature applied to the inner pot 110 is appropriately adjusted .

Since the plurality of air supply ports 121 are formed on the bottom surface of the outer tube 120, the outer air is uniformly introduced into the outer tube 120 without being introduced into only one side of the outer tube 120, The heat is uniformly transferred to the entire inner pot 110.

The bimetal plate 200 according to the embodiment of the present invention is closely attached to the bottom surface of the lower portion of the outer cylinder 120 and the bolt 300 is coupled to the center portion of the bimetal plate 200 to fix the bimetal plate 200 to the outer cylinder 120 A bolt hole 220 is formed.

The bimetallic plate 200 according to the present embodiment is fitted in the air supply port 121 and bent according to the set temperature of the electric cooking apparatus 100 to open and close the air supply port 121 to adjust the flow of air. The air opening and closing unit 210 is provided.

5, the air opening and closing part 210 is formed at both ends of the bimetal plate 200,

6, the air opening and closing part 210 may be formed at one end of the bimetal plate 200. [

The bimetallic plate 200 is fixed to the lower portion of the outer cylinder 120 with the bolts 300 and the air opening and closing portions 210 at both ends are inserted into the air supply port 121 to block the air supply port 121, The end of the bimetallic plate 200 is bent around the bolt 300 so that the air supply port 121 is opened to open the outside of the bimetal plate 200. As a result, Air is introduced into the outer cylinder 120.

The air opening / closing part 210 is formed in a semicircular shape or a balanced shape protruding downward so as to be fitted into the air supply hole 121 so as to stably block the air supply opening 121.

That is, since the air opening / closing part 210 is formed in a semicircular or equilibrium shape, the air opening / closing part 210 can be stably and firmly fitted into the air supply opening 121 to seal the air opening 121 as much as possible, It is possible to block the air inflow as much as possible.

The bimetallic plate 200 is installed in the form of a thin plate so as to smoothly open and close the air supply port 121 according to the heating of the lower sheet heating plate 130 of the electric cooking apparatus 100, .

The bimetallic plate 200 is adjusted in thickness, width and length so that the air opening and closing part 210 is bent according to the temperature set in the electric cooking apparatus 100 so that the air supply opening 121 can be opened and closed.

Example  2.

9 to 10, according to another embodiment of the present invention, an air supply port 701 is formed on a bottom surface of an outer cylinder 120 installed in the electric cooking apparatus 100 A bimetal (not shown) for controlling the flow of air by automatically opening and closing the air supply port 701 according to a temperature setting, the bimetal being connected to the second bottom bottom 700 by bolts 300, And a plate member 200.

A power bimetal temperature sensor 710 is installed in the bottom portion 700 of the second lower tassel so as to detect a temperature transmitted to the bimetal plate 200 and to prevent a malfunction due to a rise in temperature.

Example  3.

As shown in FIGS. 4 to 11, according to another aspect of the present invention, there is provided an automatic opening and closing method for automatically opening / closing an air supply port 121 of an electric cooking apparatus 100 to control the inflow of outside air (S100) in which the cooking utensil (100) is heated to a temperature higher than or equal to a set temperature when the cooking is performed by heating the inner pot (110) installed in the electric cooking appliance (100) A step S200 of opening the air supply port 121 while automatically bending the bimetallic plate 200 in the form of a thin plate by the heat of high temperature causes the air supply port 121 to be opened, (S300) of cooling the interior of the electric cooking appliance (100) by blocking the heating of the electric cooking appliance (100) when it flows into the outer casing (120) through the supply port (121) When the cooked food is finished and electricity is kept warm The bimetallic plate 200 is automatically equilibrated in step S400 when the temperature of the bimetallic plate 200 is automatically adjusted to the equilibrium state when the temperature of the bimetallic plate 200 is released, And closing the sill 121 to block the inflow of outside air (S500).

In the above, the temperature set in the electric cooking apparatus 100 is set to about 40 캜 to 90 캜.

More preferably, the temperature set in the electric cooking apparatus 100 is set at approximately 50 ° C to 80 ° C.

The step S200 of opening the air supply port 121 according to the present embodiment is a step of opening the air supply port 121 according to the present embodiment in such a manner that the food is received in the inner pot 110 of the electric cooking apparatus 100, When the inner pot 110 of the appliance 100 is heated to 40 ° C to 90 ° C of the temperature set in the electric cooking apparatus 100, the air opening / closing unit 210 at the end of the bimetallic plate 200 is bent by the high temperature heat .

The air opening and closing part 210 is bent to open the air supply port 121 so that the outside air flows into the electric cooking appliance 100 through the outer casing 120 to heat the electric cooking appliance 100 You will be able to prevent it.

In step S500 of closing the air supply port 121 according to the present embodiment, when the cooking stored in the inner pot 110 of the electric cooking appliance 100 is finished, the electric cooking appliance 100 maintains the thermal insulation When the inner temperature of the inner pot 110 is lowered to 40 ° C. to 90 ° C. of the set temperature and the set temperature is maintained, the air opening / closing part 210 of the bent bimetallic plate 200 is equilibrated, ).

The air opening and closing part 210 blocks the air supply port 121 so that the inside of the electric cooking appliance 100 is automatically closed so that outside air does not flow into the outer casing 120, So that it is possible to maintain the inside of the mechanism 100 for a long time.

Example  4.

According to another aspect of the present invention, as shown in FIG. 12, the inner pot 110 installed inside the cooking utensil 100 may be provided with an inner pot 110 inside the inner pot 110 so that the cooking temperature can be set according to the cooking. An upper temperature sensor 400 for sensing the temperature is installed.

In addition, an upper heater temperature sensor insertion pipe 410 is installed outside the upper temperature sensor 400.

A lower temperature sensor 500 is installed under the inner pot 110 of the cooking utensil 100 to sense the inner temperature of the inner pot 110 so that the cooking temperature can be set according to the cooked food.

Further, a lower heater temperature sensor insertion pipe 510 is installed outside the lower temperature sensor 500.

The pot internal temperature sensor 600 is installed on the upper or side wall of the inner pot 110 of the cooking utensil 100 so as to sense the set temperature of holding the cooked food and reheating the cooked food in a state where the cooked food is completely cooked .

A pot internal temperature sensor pipe 610 surrounding the pot internal temperature sensor 600 is installed outside the pot internal temperature sensor 600.

The upper temperature sensor 400, the lower temperature sensor 500 and the pot internal temperature sensor 600 are connected to a controller (not shown) installed in the cooking utensil 100 by electric wires.

That is, inside the electric cooking apparatus 100, an upper temperature sensor 400 is connected to a controller (not shown) by a wire to sense the internal temperature of the electric cooking apparatus 100 and set a temperature in the controller, An upper heater temperature sensor insertion pipe 410 for inserting respective temperature sensors, a lower heater temperature sensor insertion pipe 510 and a pot internal temperature sensor 600, The set temperature sensor pipe 610 is installed.

As described above, according to the present invention, an inner pot 110 for cooking food is installed in the electric cooking apparatus 100, and an outer cylinder 120 for surrounding the inner pot 110 is installed outside the inner pot 110 A plurality of air supply openings 121 are formed on the bottom surface of the outer cylinder 120.

The bimetal plate 200 is installed as a bolt 300 in the lower part of the outer cylinder 120 or the second lower cylinder bottom part 700. An air opening and closing part 210 is formed at an end of the bimetal plate 200, The air opening / closing part 210 is inserted into the air supply ports 121 and 701.

The inner pot 110 of the electric cooking apparatus 100 is filled with food and the inner pot 110 of the electric cooking apparatus 100 is cooked by heating the inner pot 110, The air opening and closing part 210 at the end of the bimetallic plate 200 is bent by the heat at a high temperature and the air opening and closing part 210 is curled by the air opening and closing part 210, And the air is introduced into the outer tube 120 to block the heating of the outer tube 120, thereby preventing the cooked food from burning and preventing the food from being cooked, thereby providing the best taste.

When the inner pot 110 of the electric cooking apparatus 100 is heated to cook the food, the electric cooking apparatus 100 is kept warm. When the temperature in the electric cooking apparatus 100 is maintained at a temperature The air opening / closing part 210 of the bimetallic plate 200, which has been bent due to the temperature lower than that at the time of heating, becomes equilibrium and blocks the air supply ports 121 and 701.

Accordingly, the air opening / closing part 210 of the bimetallic plate 200 blocks the air supply ports 121 and 701, thereby maintaining the set temperature for a long period of time, thereby preventing deterioration of the cooked food and maintaining the best taste for a long time .

As described above, the present invention is not limited to the above-described specific preferred embodiments, and any person skilled in the art can make various modifications without departing from the gist of the present invention. It is to be understood that such changes and modifications are intended to fall within the scope of the appended claims.

100: Electric cooking appliance
110: inner pot
120: outer tube
121, 701:
130: Lower sheet heating plate
200: Bimetallic plate
210: air opening /
220: Bolt hole
300: Bolt
400: upper temperature sensor
410: upper heater temperature sensor insertion tube
500: Lower temperature sensor
510: Lower heater temperature sensor insertion tube
600: set temperature sensor inside pot
610: Setting pot inside the pot
700: second lower bottle bottom part
710: Power bimetal temperature sensor

Claims (17)

1. An electric cooking appliance comprising an inner pot in which food is received and cooked so as to automatically open and close the inflow of outside air by temperature setting, and an outer casing which is installed while enclosing the inner pot on the outside of the inner pot,
An air supply port formed on a lower surface of an outer cylinder of the electric cooking apparatus; And
A bimetallic plate installed at a lower portion of the outer cylinder to open and close an air supply port according to a heating temperature of the electric cooking appliance to control the inflow of outside air;
And an electric cooking device. The method according to claim 1,
Wherein the air supply port is formed at least on the lower surface of the outer cylinder and is automatically opened and closed by temperature setting. 3. The method according to claim 1 or 2,
Wherein the air supply port is opened to the outside of the electric cooking appliance so that air can be introduced into the outer bottom of the outer casing and is automatically opened and closed by setting the temperature. The method according to claim 1,
Wherein the bimetallic plate is bolted to a bottom surface of the outer tube and automatically opened and closed by temperature setting. The method according to claim 1,
Wherein an air opening / closing part is provided at an end of the bimetallic plate to open / close an air supply port to control the flow of outside air, and is automatically opened / closed by temperature setting. 6. The method of claim 5,
Wherein the air opening / closing part is formed in a semicircular or balanced shape protruding downward so as to stably block the air supply port, and is automatically opened / closed by temperature setting. 6. The method of claim 5,
Wherein the air opening / closing unit is formed at one end of the bimetal plate or at both ends thereof, and is automatically opened / closed by temperature setting. The method according to claim 1,
Wherein the bimetallic plate is formed in the form of a thin plate so as to smoothly open and close the air supply port according to the heating of the lower sheet heat plate so as to control the inflow of outside air, and is automatically opened and closed by setting the temperature. 1. An electric cooking appliance comprising an inner pot in which food is received and cooked so as to automatically open and close the inflow of outside air by temperature setting, and an outer casing which is installed while enclosing the inner pot on the outside of the inner pot,
A second lower bottle bottom part installed at a lower portion of the outer tube and having an air supply port formed on a bottom surface thereof; And
A bimetal plate fastened to the bottom of the second lower barrel by a bolt to automatically open and close the air supply port according to the temperature setting to regulate inflow of air;
And an electric cooking device. 10. The method of claim 9,
In the bottom portion of the second lower cylinder,
Wherein a power bimetal temperature sensor is installed to detect a temperature transmitted to the bimetallic plate and prevent a malfunction due to a rise in temperature, and is automatically opened and closed by temperature setting. A method for automatically opening and closing an air supply port formed in a bottom surface of an outer cylinder of an electric cooking apparatus,
Preparing a cooked product by heating the cooked product in an inner pot of the electric cooking appliance;
When the temperature of the electric cooking apparatus rises above a predetermined temperature, opening the air supply port while automatically bending the thin plate-shaped bimetallic plate by high temperature heat;
Introducing outside air through an air supply port to cool the electric cooking apparatus while heating the opening of the air supply port;
A step of automatically balancing the bimetal plate which is opening the air supply port when the cooking of the inner pot is completed and the set temperature is maintained at the time of keeping warm; And
Closing the air supply port while the bimetallic plate is automatically balanced so as to block the inflow of outside air;
And an automatic opening / closing method of the electric cooking appliance. 12. The method of claim 11,
Wherein the temperature set in the electric cooking apparatus is set at 40 ° C to 90 ° C. 12. The method of claim 11,
The step of opening the air supply port may include opening the air supply port by bending the bimetallic plate made of a thin plate structure by the heat of high temperature when the electric cooking apparatus is raised at a set temperature for cooking to cook the food, Wherein air is introduced into the outer cylinder of the electric cooking appliance to prevent heating of the electric cooking appliance. 12. The method of claim 11,
The step of closing the air supply port to block the inflow of outside air may be performed such that when cooking of the food stored in the inner pot of the electric cooking apparatus is completed, the electric cooking apparatus maintains the warming temperature, and when the internal temperature of the electric cooking apparatus is set Wherein the bimetallic plate is equilibrated and the air supply port is closed so that the outer bottom portion of the electric cooking appliance automatically blocks the inflow of outside air to maintain the inside of the electric cooking appliance for a long time. 1. A cooking appliance comprising an inner pot in which cooking food is received and cooked, and an outer cylinder which is installed while surrounding the inner pot on the outer side of the inner pot,
An upper temperature sensor installed on the inner pot of the cooking utensil and connected to the control unit so that the temperature can be set according to the cooked food when cooked in the inner pot; And
And an upper heater temperature sensor insertion tube for inserting an upper temperature sensor into an upper portion of the inner pot of the cooking utensil. 16. The method of claim 15,
A lower temperature sensor installed at a lower portion of the inner pot of the cooking utensil and connected to the control unit so that the temperature can be set according to the cooked food when cooked in the inner pot; And
And a lower heater temperature sensor insertion tube for inserting a lower temperature sensor into a lower portion of the inner pot of the cooking utensil. 16. The method of claim 15,
A pot internal preset temperature sensor connected to the control unit so as to be able to sense the temperature maintenance and the reheating set temperature of the cooked food installed on the upper or side wall of the inner pot of the cooking apparatus; And
And a pot internal preset temperature sensor pipe for inserting the pot internal preset temperature sensor into the upper or side wall of the inner pot of the cooking utensil.

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