KR101173245B1 - electromagnetic induction heating cooker and manufacturing method of cooker - Google Patents

Abstract

In order to improve the functionality and manufacturing convenience of the product, the present invention relates to an electromagnetic induction heating cooking apparatus provided with a thin heating coil along a spiral contact groove formed on the outer surface of the coil base and a manufacturing method thereof. The present invention is the main body is formed with an opening in the inner side so that the inner pot is accommodated food is inserted; A coil base formed in a shape in which an inner side is recessed to surround an outer circumference of the inner pot, and disposed inside the main body, wherein a coil base having a spiral contact groove is formed along an outer surface thereof; And a thin plate heating coil which is held by the heat-sealing fixing jaw formed at the edge of the close contact groove and adheres along the inside, and is made of a conductive material and inductively heats the inner pot by selective power supply. Provide the appliance.

Description

Electromagnetic induction heating cooker and manufacturing method thereof

The present invention relates to an electromagnetic induction cooking apparatus and a method for manufacturing the same, and more particularly, to an electromagnetic induction cooking apparatus and a method for manufacturing the same, which are cooked by heating the inner pot itself by a heating coil provided on an outer surface of the coil base. will be.

In general, a cooking apparatus is a cooking apparatus for cooking various foods such as rice, soup, steamed rice, etc. by a heating apparatus, and a representative cooking apparatus of Korea, which uses rice as a stock, includes an electric pressure rice cooker.

In this case, the cooking apparatus such as the electric pressure cooker may be divided into a hot plate heating type cooking device and an electromagnetic induction heating type cooking device according to a heating method. In recent years, the inner pot itself generates heat, resulting in a strong thermal power such as a gas fire, and precise heat control. The electromagnetic induction heating cooking apparatus that can be quickly made is mainly used.

Specifically, the electromagnetic induction cooking device is to cook food by generating heat by electromagnetic force, and when the metal is raised in a magnetic field in which the direction of the magnetic force line is changed, the metal itself is itself through a spiral current generated by electromagnetic induction. The principle of heat generation is applied.

On the other hand, the cooking appliance is not limited to the electric pressure cooker, but will be described below to be limited to the electric pressure cooker for convenience of description.

1 is a cross-sectional view showing a conventional electromagnetic induction heating cooking apparatus.

As shown in FIG. 1, the conventional electromagnetic induction heating type cooking apparatus 1 includes a main body 3 forming an exterior, a coil base 5 fixed to an inner side of the main body to form an acceptable space, and the coil base. Inner pot (7) detachably coupled to the receiving space of the (5), a heating coil (9) is provided on the outer surface of the coil base (5) generating magnetic lines of force, and the main body of the It comprises a side heater 11 provided at the upper end.

In detail, the conventional electromagnetic induction heating type cooking device 1, which is configured as described above, is supplied with power and at the same time a change of the magnetic force line is generated by the heating coil 9 so that the coil base 5 is accommodated. Current flows through the stainless layer of the inner pot 7. Then, the heat generated by the current can be spread throughout the inner pot 7 through the aluminum layer of the inner pot 7 having a high thermal conductivity can be cooked food.

However, the conventional induction heating type cooking apparatus 1 includes the inner pot 7 because the heating coil 9 formed by winding a plurality of copper wires is mainly installed only under the outer surface of the coil base 5. Since the calorific value of the partial difference occurs according to the upper and lower ends of the inner pot 7, there is a serious problem that the food filled up to the upper end of the inner pot 7 is not evenly cooked as a whole.

Furthermore, although the side heater 11 is further provided as an auxiliary heat source at the upper end of the outer surface of the coil base 5 to compensate for this, the number of components increases due to the addition of the side heater 11, thereby increasing the manufacturing cost. In addition, assembling work is cumbersome, there was a problem that productivity is significantly reduced.

In order to solve the above problems, the present invention is a thin plate heating coil provided by laser trimming so that the food of the inner pot is cooked evenly is formed to surround the entire outer surface of the coil base, the electromagnetic induction to improve the functionality and manufacturing convenience of the product It is a problem to provide a heated cooking appliance and a method of manufacturing the same.

In order to solve the above problems, the present invention is the main body formed with an opening in the inner pot so that the food is accommodated; A coil base formed in a shape in which an inner side is recessed to surround an outer circumference of the inner pot, and disposed inside the main body, wherein a coil base having a spiral contact groove is formed along an outer surface thereof; And in order to heat the inner pot by electromagnetic induction in accordance with the optional power supply, the end of the fixing projections protruding to the edge of the contact grooves are held by the heat-sealed fixing jaw formed by heat-sealing processing inside the contact grooves It provides an electromagnetic induction heating cooking device comprising a thin plate-shaped heating coil made of a spiral wound-type conductor thin plate in close contact with.

Here, a separate fixing support part is further provided inside the main body so that the lower case provided at the lower side is fastened and fixed, wherein the fixing support part includes a through hole formed so that the coil base is interposed therein, and an edge portion of the through hole. The main body fastening portion protruding upward on the upper edge of the edge portion to be fastened to the main body, and the bottom fastening portion protrudes downward on the lower surface of the lower edge portion so that the fastening extension portion of the lower case is fastened to the edge of the through hole. The fastening hole is formed, it is preferable to include a lower fastening portion is formed in the reinforcement support portion on the outer circumference so that the support force is reinforced.

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Furthermore, it is preferable that a silicon adhesive layer is provided between the coil base and the thin heating coil.

In addition, the thin heating coil is made of aluminum, the surface is preferably an insulating coating in consideration of heat resistance.

On the other hand, the present invention comprises the first step of providing a spiral wound thin plate-shaped heating coil by cutting the conductor thin plate formed in a plane by press working in a spiral at a predetermined interval; The thin plate heating coil is spirally formed on the outer surface of the coil base to heat the inner pot disposed inside the coil base by electromagnetic induction according to the selective power supply, and adheres along the tight groove where the silicon adhesive layer is formed. Step 2; And a third step of forming an end portion of the fixing protrusion protruding from the edge of the contact groove so that both sides of the thin plate heating coil is fixed to the heat-sealing fixing jaw by thermal welding. Provide a method.

In addition, the present invention is a first step of forming a thin plate-shaped heating coil of spiral wound by laser trimming the conductor thin plate formed to be bonded to the outer surface of the coil base by deep drawing processing; The thin plate heating coil is spirally formed on the outer surface of the coil base to heat the inner pot disposed inside the coil base by electromagnetic induction according to the selective power supply, and adheres along the tight groove where the silicon adhesive layer is formed. Step 2; And a third step of forming an end portion of the fixing protrusion protruding from the edge of the contact groove so that both sides of the thin plate heating coil is fixed to the heat-sealing fixing jaw by thermal welding. Provide a method.

Through the above solving means, the electromagnetic induction heating cooking apparatus and its manufacturing method of the present invention provides the following effects.

First, the electromagnetic induction heating cooking apparatus of the present invention is formed so that the thin heating coil surrounds the entire outer surface of the coil base, and thus the upper and lower ends of the inner pot provided inside the coil base according to the power supply are uniformly heated, thus the cooking amount. Irrespective of whether the food is cooked evenly, the functionality of the product and the user's satisfaction may be improved.

Second, the thin heating coil provided by the cutting process such as laser trimming is easily wound by a close contact groove formed spirally and uniformly on the outer surface of the coil base, wherein the thin heating coil is closely contacted by the silicon adhesive layer formed in the close contact groove. Since both sides of the thin plate type heating coil are held and fixed by the heat welding fixing jaw formed at the edge of the close contact groove, the plate type heating coil is stably formed on the outer surface of the coil base, thereby improving the quality of the product.

Third, since the thin plate heating coil is uniformly formed on the entire outer surface of the coil base, it is not necessary to additionally provide an auxiliary heat source such as a side heater. Since it is not necessary to provide an auxiliary fixture for compensating the fixing of the heating coil, the number of components of the electromagnetic induction cooking apparatus can be minimized, thereby reducing the manufacturing cost.

Fourth, when the lower case is coupled to the main body is coupled step by step by a fixed support unit is firmly assembled, the lower case and the fastening extension formed on the main body according to the projecting degree of the lower fastening portion and the main body fastening portion of the fixed support By adjusting the degree of protrusion appropriately, the risk of breakage and deformation due to external force can be minimized and assembly durability can be significantly improved.

1 is a cross-sectional view showing a conventional electromagnetic induction heating type cooking apparatus.
Figure 2 is a cross-sectional view showing an electromagnetic induction heating cooking apparatus according to a preferred embodiment of the present invention.
3a to 3c is a schematic diagram showing the order in which the heating coil is formed on the coil base according to a preferred embodiment of the present invention.
Figure 4 is an exploded perspective view showing a main body and a fixed support of the electromagnetic induction heating cooking apparatus according to a preferred embodiment of the present invention.
Figure 5 is a cross-sectional view showing an electromagnetic induction heating cooking apparatus having a fixed support according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the electromagnetic induction heating cooking apparatus and a manufacturing method according to a preferred embodiment of the present invention.

2 is a cross-sectional view showing an electromagnetic induction heating cooking apparatus according to a preferred embodiment of the present invention.

As shown in Figure 2, the electromagnetic induction heating type cooking apparatus 29 according to a preferred embodiment of the present invention comprises a main body 31, a coil base 41 and a thin heating coil (51).

Here, the main body 31 has a predetermined space therein and is formed in the shape of a case forming an external appearance of the cooking apparatus, and the opening 33 to insert the inner pot 35 in which food is accommodated inside the upper part of the main body 31. Is preferably formed.

The inner case of the main body 31 formed as described above is equipped with internal components such as the coil base 41, the thin heating coil 51, and a power supply unit, and then a lower case 37 is coupled to the lower portion thereof. In this case, the coil base 41 is formed in a shape in which the inner side is recessed to surround the outer circumference of the inner pot 35, and is disposed and fixed inside the main body 31, and the spiral contact groove 91 is formed on the entire outer surface thereof. ) Is uniformly formed, and is mainly used as a synthetic resin injection product such as PET (polyethylene terephthalate) resin having good heat resistance.

On the other hand, the thin heating coil 51 is held by the heat-sealed fixing jaw portion (93a) formed on the edge of the close contact groove 91 is in close contact with the inside, made of a conductive material, the inner pot by a selective power supply It is preferable to provide 35 for induction heating.

That is, the thin heating coil 51 is formed in a spiral winding type by cutting processing such as laser trimming and is wound while being wound along the close contact groove 91 of the outer surface of the coil base 41. End portions of the fixing projections 93 protruding from the edge of the 91 are formed by the heat-sealed fixing jaw portion 93a, so that both sides of the thin plate heating coil 51 closely contacted with the contact grooves 91 are caught. It can be supported and fixed by pressure.

In this case, the heat fusion processing refers to a processing method in which the thermoplastic resin is softened through a heating process to be cooled and solidified in a predetermined form, and the protrusion is preferably understood to mean that it is formed to protrude.

For example, the fixing protrusion 93 formed at the edge of the contact groove 91 has a flat inner wall portion with a predetermined inclination so that the thin plate-shaped heating coil 51 smoothly enters and sits in the contact groove 91 when initially formed. Preferably formed. Accordingly, both sides of the thin heating coil 51 may be inserted along the inner wall of the fixing protrusion 93 to be seated in the close contact groove 91. Then, when the mounting of the thin heating coil 51 is completed as described above, the end of the fixing protrusion 93 is heat-sealed to form the heat welding fixing jaw portion 93a, so that the thin heating coil 51 is heated. In addition to being adhered by the fusion fixing jaw portion 93a, separation from the adhesion groove 91 may be prevented.

Furthermore, when the thin heating coil 51 is inserted into the tight groove 91 and is seated, the thin heating coil 51 is in close contact with the coil base 41 and the thin heating coil 51 to be completely attached. It is preferable that the silicon adhesive layer 53 is provided to be fixed.

Accordingly, the thin heating coil 51 is in close contact with the outer surface of the coil base 41, that is, the bottom surface of the contact groove 91 by the silicon adhesive layer 53, and the heat welding fixing jaw portion 93a. It is secured by being secured by both sides by the engaging portion, the thin-shaped heating coil 51 can be formed uniformly.

At this time, the thin plate-shaped heating coil of the single wire may be formed in multiple parallel to the outer surface of the coil base so that the electromotive force generated in the inner pot is increased, which is formed in a plurality of close contact grooves of the coil base in parallel, the close contact groove formed in parallel Accordingly, the thin plate-shaped heating coil may be sequentially inserted and fixed as described above.

On the other hand, in the present invention, as described above, the thin plate-shaped heating coil 51 is uniformly formed on the entire outer surface of the coil base 41, because even cooking of food is not possible with a conventional cooking appliance. That is, in the conventional cooking appliance, since the heating coil is installed only on the lower side and the bottom of the outer surface of the coil base, a partial difference occurs in the calorific value of the inner pot provided inside, so that the food of the inner pot is not cooked evenly as a whole. There was a serious problem. Therefore, in the present invention, the thin plate-shaped heating coil 51 is uniformly formed on the entire outer surface of the coil base 41 so that the inner pot 35 evenly heats food, so that food can be cooked evenly.

3A to 3C are schematic diagrams illustrating a sequence in which heating coils are formed in a coil base according to a preferred embodiment of the present invention.

As shown in Figure 3a to Figure 3c, the outer surface of the coil base 41 formed so that the inner pot is wrapped is preferably provided with a thin heating coil 51 is wound along the spiral contact groove 91.

Here, in order to provide the thin plate-shaped heating coil 51 to the coil base 41, first, a thin plate-shaped heating coil 51 is formed by cutting a thin plate of conductor formed in a plane by a spiral at a predetermined interval by press working.

For example, a conductor such as aluminum is rolled to form the conductor thin plate, and then the conductor thin plate is spirally cut to correspond to the contact groove 91 of the coil base 41 by pressing to form the thin plate heating coil. 51 may be provided.

Then, the thin plate-shaped heating coil 51 provided as described above is formed in a spiral shape on the outer surface of the coil base 41 while being in close contact with the close groove 91 in which the silicon adhesive layer 53 is formed. Subsequently, end portions of the fixing protrusions 93 protruding from the edges of the contact grooves 91 so as to be pressurized and fixed to both sides of the thin plate-shaped heating coil 51 are formed as heat-sealing fixing jaw portions 93a by heat fusion processing. Accordingly, the thin plate-shaped heating coil 51 is uniformly provided on the outer surface of the coil base 41.

On the other hand, the thin plate-shaped heating coil 51 may be provided by press working as described above, it may be provided by laser trimming.

Specifically, a thin conductor thin plate formed to be joined to the outer surface of the coil base 41 by deep drawing is formed into a spiral thin heating coil 51 by laser trimming. For example, by pressing a punch with a die formed to correspond to the outer shape of the coil base 41 by a punch, a thin plate of a conductor is formed to be joined to the outer surface of the coil base 41, and the thin plate of the conductor is a laser tree. The thin plate-shaped heating coil 51 may be provided.

Here, the laser trimming processing refers to a processing method of cutting a portion of an object by focusing irradiation with a laser beam on the object.

As described above, the thin plate-shaped heating coil 51 is spirally formed on the outer surface of the coil base 41 and closely adhered along the contact groove 91 in which the silicon adhesive layer 53 is formed. End portions of the fixing projections 93 protruding from the edges of the contact grooves 91 so that both side portions of the coil 51 are pressurized and fixed are formed as heat-sealing fixing jaw portions 93a by thermal welding. Accordingly, the thin plate-shaped heating coil 51 is uniformly provided on the outer surface of the coil base 41.

Therefore, the thin plate-shaped heating coil 51 provided by press working or laser trimming is completely fixed to the close contact groove 91 by the heat-sealed fixing jaw portion 93a of the fixing projection 93 so that the coil base 41 Since uniformly provided throughout the outer surface of the), the upper and lower parts of the inner pot can be heated evenly as a whole, there is no need to be provided with an auxiliary fixture for complementing the fixing of the thin-plate heating coil 51 is minimized the number of components of the cooking appliance Therefore, the manufacturing cost can be reduced.

On the other hand, the thin plate-shaped heating coil 51 provided as described above is made of a conductive aluminum material, it is provided with a coating or plating treatment with an insulation such as enamel for heat resistance improvement and corrosion prevention and insulation.

And, both ends of the thin-plate heating coil 51 is preferably provided with a power connection portion 57 is connected to the power supply unit 55.

In detail, the power connection unit 57 is provided as a ring terminal and the like, and is coupled to the power supply unit 55 by screwing, so that a current can be applied to the thin plate heating coil 51. In this case, the power connector 57 may be provided with various electrical connectors formed of an insulating thermoplastic resin as well as the ring terminal.

Figure 4 is an exploded perspective view showing a main body and a fixed support of the electromagnetic induction heating cooking apparatus according to a preferred embodiment of the present invention, Figure 5 is an electromagnetic induction heating cooking apparatus having a fixed support according to a preferred embodiment of the present invention. It is a cross section.

4 and 5, it is preferable that a separate fixed support portion 71 is further provided in the main body 31 so that the lower case 37 coupled to the lower side of the main body is fastened and fixed.

Here, the through hole 89 is formed in the fixed support 71 so that the coil base 41 is interposed therebetween, and the fixed support 71 is formed on the upper surface of the edge portion 73 of the through hole 89. The main body fastening portion 81 is formed to be coupled to the main body 31, and the lower case 37 is connected to the lower surface of the edge portion 73 so that the lower fastening portion 75 is coupled to the main body 31. Is formed.

Specifically, the main body fastening portion 81 protrudes upward from the upper surface of the edge portion 73 and is provided with a fastening hole 81z formed therein, and the lower fastening portion 75 has a lower surface of the edge portion 73. Protruding downward from the fastening hole (75z) is formed on the inside.

Therefore, the main body fastening portion 81 is disposed to face the fastening extension portion 83 formed to extend to a predetermined length on the lower surface of the edge portion of the main body opening (33 in FIG. 2) to be mutually coupled with a coupling member such as a screw. By being fastened, the fixed support part 71 may be stably coupled to the main body 31.

At this time, a mounting groove is formed at the end of the main body fastening portion 81 so that the end of the fastening extension portion 83 is seated so that the coupling operation of the main body 31 and the fixed support portion 71 is performed more efficiently. desirable. When the seating groove is formed as described above, when the fixed supporter 71 is coupled to the main body 31, the end of the fastening extension part 83 is seated in the seating recess of the main body fastening portion 81. Not only the fastening hole 81z and the fastening hole of the fastening extension part 83 coincide with each other, but the matched state is maintained so that the fastening operation by the coupling member can be easily performed.

Through this, when the coupling of the fixed support 71 to the main body 31 is completed, the lower case 37 is coupled to the main body 31 by the lower fastening portion 75 of the fixed support 71. .

That is, the fastening extension part 85 of the lower case 37 is provided on the inner surface of the lower case 37 so that the fastening extension part 85 is formed to face the lower fastening part 75. And the lower fastening portion 75 are mutually coupled by a coupling member such as a screw, the lower case 37 can be stably coupled to the lower portion of the main body 31.

As described above, the lower case 37 is coupled to the main body 31 step by step by the fixed supporter 71 so that each of the fastening and extending parts 83 and 85 of the main body 31 and the lower case 37 are provided. Protruding degree with respect to may be provided as appropriately adjusted.

In detail, in the related art, since the lower case is directly coupled to the main body, the coupling extension parts of the main body and the lower case are protruded as much as possible to be mutually coupled. In addition, since the internal space of the main body should be provided with various internal parts including the coil base, the internal diameter size of each of the fastening and extension parts is inevitably minimized. Therefore, each fastening extension portion formed to protrude as much as possible with a minimum inner diameter is not only easily damaged by external impulse to lower its supporting force, but also frequently causes shape deformation such as bending due to heat generated from the inner pot when cooking food. There was a serious problem that the coupling state of the lower case is distorted.

Therefore, in the present invention, the fixed support part 71 is considered in consideration of the improvement of the supporting force of each of the fastening and extension parts 83 and 85 of the main body 31 and the lower case 37 and the efficient use of the internal space of the main body 31. The lower case 37 is configured to be coupled to the main body 31 through.

That is, the fastening extension parts 83 and 85 formed in the main body 31 and the lower case 37 by the main body fastening part 81 and the lower fastening part 75 of the fixed support part 71 are unreasonable. The protruding degree may be appropriately adjusted according to the protruding degree of the main body fastening part 81 and the lower fastening part 75 without needing to protrude, and furthermore, each of the fastening extension parts 83 and 85 may be provided. Since each of the internal spaces of the main body 31 is formed and disposed on the upper and lower sides of the main body 31 in which a relatively large amount of free space is formed, the respective fastening extensions 83 and 85 are formed with the maximum inner diameter in consideration of the free space. The bearing capacity can be significantly improved.

In addition, the lower fastening portion 75 of the fixed support portion 71 is provided with a reinforcement support portion 79 on the outer circumference so that its supporting force is reinforced, wherein the reinforcement support portion 79 extends the inner circumference of the through hole 89. It is formed to be connected to the portion 77 and one end of the reinforcing support portion 79 is formed to be connected to the edge portion 73 of the through hole 89, the reinforcement support portion 79 formed as described above is the lower fastening portion By providing a plurality of the outer periphery of the (75) can also significantly improve the bearing capacity of the lower fastening portion (75). Of course, the reinforcing support part 79 may be provided in the main body fastening part 81 and the fastening extension parts 83 and 85.

In this case, the inner circumferential extension portion 77 of the through hole 89 is formed to extend to correspond to the projecting degree of the lower coupling portion 75 so as to surround the coil base 41. Heat transfer from the inner pot is minimized so that the shape deformation of the lower fastening portion 75 according to the heat transfer may be blocked in advance.

Accordingly, as described above, each of the fastening and extension parts 83 and 85 having a significantly improved support force are connected to the fixed support 71 to be fixed by the coupling member, thereby allowing the main body 31 and the lower case 37 to be fixed. Since firmly coupled to the assembly durability of the cooking appliance 29 can be significantly improved.

As described above, the present invention is not limited to the above-described embodiments, but may be modified and implemented by those skilled in the art without departing from the scope of the claims of the present invention. Such modifications are within the scope of the present invention.

29: electromagnetic induction cooking appliance 31: main body
33: opening 35: inner pot
37: lower case 41: coil base
51: thin plate heating coil 53: silicon adhesive layer
55: power supply 57: power connection
71: fixed support portion 73: edge portion of the through-hole
75: lower fastener 77: inner peripheral extension
79: reinforcing support 81: main body fastening
83, 85: tightening extension 89: through hole
91: close contact 93: fixing projection
93a: heat-sealed jaw portion

Claims (7)

A main body having an opening formed therein such that the inner pot for receiving food is inserted therein;
A coil base formed in a shape in which an inner side is recessed to surround an outer circumference of the inner pot, and disposed inside the main body, wherein a coil base having a spiral contact groove is formed along an outer surface thereof; And
In order to heat the inner pot by electromagnetic induction according to an optional power supply, the end of the fixing protrusion protruding from the edge of the contact groove is held by a heat welding fixing jaw formed by heat-sealing processing to close the inside of the contact groove. Electromagnetically induction heating cooking device comprising a thin plate-shaped heating coil made of a spiral wound-type conductor thin. delete The method of claim 1,
Inside the main body is further provided with a separate fixed support so that the lower case is fastened and fixed to the lower side,
The fixed support portion,
A through hole formed to interpose the coil base therein;
A main body fastening portion protruding upwardly from the upper edge of the edge portion so that the edge portion of the through hole is fastened to the main body, and a fastening hole is formed in the inner side thereof;
The lower end of the through-hole protruding downward on the lower portion of the edge portion to fasten the fastening extension of the lower case is formed in the inner fastening portion, and comprises a lower fastening portion is formed on the outer periphery so that the support force is reinforced Electro-induction heating cooker. The method of claim 1,
Electromagnetically induction heating cooking device characterized in that the silicon adhesive layer is provided between the coil base and the thin plate-shaped heating coil. The method of claim 1,
The thin plate-type heating coil is made of aluminum, the electromagnetic induction heating cooking apparatus, characterized in that the surface is treated with an insulating coating in consideration of heat resistance. A first step of cutting the conductor thin plate formed in a plane by press working in a spiral at a predetermined interval and having a spiral wound thin plate heating coil;
The thin plate heating coil is spirally formed on the outer surface of the coil base to heat the inner pot disposed inside the coil base by electromagnetic induction according to the selective power supply, and adheres along the tight groove where the silicon adhesive layer is formed. Step 2; And
And a third step of forming an end portion of the fixing protrusion protruding from the edge of the contact groove so that both sides of the thin plate heating coil are pressurized and fixed to the heat-sealing fixing jaw by heat-sealing processing. . A first step of forming a thin plate-shaped heating coil of spiral wound type by laser trimming the conductor thin plate formed to be joined to the outer surface of the coil base by deep drawing;
The thin plate heating coil is spirally formed on the outer surface of the coil base to heat the inner pot disposed inside the coil base by electromagnetic induction according to the selective power supply, and adheres along the tight groove where the silicon adhesive layer is formed. Step 2; And
And a third step of forming an end portion of the fixing protrusion protruding from the edge of the contact groove so that both sides of the thin plate heating coil are pressurized and fixed to the heat-sealing fixing jaw by heat-sealing processing. .

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