KR101671901B1 - inductive heating apparatus for cooking - Google Patents

inductive heating apparatus for cooking Download PDF

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Publication number
KR101671901B1
KR101671901B1 KR1020150050869A KR20150050869A KR101671901B1 KR 101671901 B1 KR101671901 B1 KR 101671901B1 KR 1020150050869 A KR1020150050869 A KR 1020150050869A KR 20150050869 A KR20150050869 A KR 20150050869A KR 101671901 B1 KR101671901 B1 KR 101671901B1
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KR
South Korea
Prior art keywords
heating plate
surface heating
latching
folded
coil
Prior art date
Application number
KR1020150050869A
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Korean (ko)
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KR20160121195A (en
Inventor
구본학
김원주
Original Assignee
쿠쿠전자주식회사
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Priority to KR1020150050869A priority Critical patent/KR101671901B1/en
Publication of KR20160121195A publication Critical patent/KR20160121195A/en
Application granted granted Critical
Publication of KR101671901B1 publication Critical patent/KR101671901B1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0248—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using a sighting port, e.g. camera or human eye
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/028—Heaters specially adapted for trays or plates to keep food or liquids hot
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Cookers (AREA)

Abstract

In order to prevent abnormal overheating generated at a connection portion of a side heating plate which is energized by electromagnetic induction to improve the durability and safety of the product, the present invention is characterized in that the inner pot is provided inside the outer base forming the enclosure, A cooking apparatus according to any one of claims 1 to 3, wherein the side plates are coupled to each other so that the side plates are engaged with each other, wherein at least two contact portions between the outer surfaces of the side plates A first latching portion bent at an outer surface of the side surface heating plate so as to face each other is formed at one end of the side surface heating plate and a second latching portion is formed at the other end of the side surface heating plate so that the inner surface of the side surface heating plate is closely contacted A folded and folded superimposed portion, and a second folded portion so that the folded portion is opposed to the inner surface of the side heating plate. It provides an induction heating cooker according to claim a second engaging portion formed to include a banding.

Description

[0001] The present invention relates to an inductive heating apparatus for cooking,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker, and more particularly, to an induction heating cooker in which durability and safety of a product are improved by preventing abnormal overheating generated at a connection portion of a side heating plate energized by electromagnetic induction.

Generally, an induction heating cooker is an apparatus that generates heat by electromagnetic force to heat a food. When a metal is placed in a magnetic field whose direction of a magnetic force line changes, the metal itself is heated by an eddy current generated by electromagnetic induction .

Here, the cooker is a concept including an electric pressure cooker for cooking a variety of foods such as rice, soup, pot and the like, and is not limited to the electric pressure cooker. However, the following description is limited to the electric pressure rice cooker for convenience of explanation.

2 is a perspective view showing a side plate of a conventional induction heating cooker, and FIG. 3 is a cross-sectional view showing a connection portion of a side plate of a conventional induction heating cooker .

1 to 3, the induction heating cooker 1 comprises an outer base 20 which forms an outer shell, a coil base 30 which forms a space which is fixed inside the outer base 20, And an inner pot 60 detachably coupled to the receiving space of the coil base 30.

At this time, a working coil 40 for generating a magnetic force line is provided along the lower side of the outer side of the coil base 30, and the upper end of the side plate 10 is supported at the upper end of the outer base 20 A support ring 50 having a circular shape is provided.

The side surface heating plate 10 is installed in a circular shape and is positioned between the coil base 30 and the support ring 50 so as to surround the inner pot 60, And a heat ray heater (80) for providing a heat source at the time of keeping warm is provided on the outer side surface.

Here, the side surface heating plate 10 is preferably formed of a metal material and is disposed around the coil base 30, and is inevitably electromagnetically induced, and preferably includes a component having an overlapped contact portion through which an induction current is conducted .

Meanwhile, the conventional side heating plate 10 is manufactured by circularly cutting an elongated rectangular metal plate, which has been insulated for mass production, to a predetermined length so as to surround the inner pot, and is joined at both ends.

At this time, referring to FIG. 3, a springback phenomenon may occur due to a resilient action to recover the original shape when the pressure for machining is removed from the plastic material.

The gap 12 is generated due to the springback phenomenon in the connecting portion 11 to which the opposite end portions of the side surface heating plate 10 are coupled and the inevitably generated There is a problem that the contact resistance is locally increased due to the gap 12 generated when the induction current is supplied, and abnormal overheating may occur.

However, since the variation of the contact resistance is largely changed according to the pressing depth during punching, there is still a problem with abnormal overheating. In case of punching, the inner pot 60 The outer surface is damaged and the surface of the inner pot 60 is easily damaged when the inner pot 60 is attached or detached.

In addition, when the side surface heating plate 10 is provided as a PCM (pre-coated metal), there is a problem in that it is difficult to apply the spot welding to each contact surface of the connecting portion by the coating layer.

As a result, the proportion of defective products among the mass-produced products is high, and the production cost rises due to the various process costs for disposing defective products.

Registration Utility Model No. 20-0156181

The object of the present invention is to provide an induction heating cooker in which durability and safety of a product are improved by preventing abnormal overheating generated at a connecting portion of a side heating plate which is energized by electromagnetic induction.

In order to solve the above-described problems, the present invention is characterized in that a side plate is provided on the inner side of an outer base forming an enclosure, the side plate being formed to surround the inner pot along the upper side of the coil base, In the induction heating cooker, both side ends of the side surface heating plate are coupled to each other so that the side surfaces of the side surface heating plate are coupled with each other, And the other end of the side surface heating plate is formed with a first folded portion which is firstly folded and overlapped so that the inner surfaces of the side surface heating plates are in close contact with each other, And a second latching portion including a car bending accommodating bending portion is formed.

Here, the folded portion may be inserted into the first latching portion, and the end of the first latching portion may be inserted into the second latching portion.

delete

At this time, it is preferable that the second latching part is connected to the bending part bent at the multi-step so as to protrude to the outer surface side so that the inner surfaces of both end parts of the side surface heating plate are mutually continuous.

It is preferable that the contact resistance value of the connection portion between the both ends of the side surface heating plate is calculated by measuring the DC resistance value of the heating coil through which a current having a specific frequency and voltage is energized in a state in which the side surface heating plate is seated on the coil base .

It is preferable that the side surface heating plate is provided with a conductor having an insulating coating layer formed along the inner surface thereof.

The present invention provides the following effects through the above solution.

First, since two or more contact portions are formed between both ends of the side surface heating plate, the safety of the product can be improved by preventing an increase in contact resistance due to an insufficient electric current area and thus a local abnormal overheating, The flow of the induced current can be more stably performed even when the paint layer is formed.

Secondly, when the folded portion is inserted into the first latching portion and the end portion of the first latching portion is inserted into the second latching portion, the outer surface of the folded portion is restored by the springback during the restoration of the second latching portion Side end surface of the first heat-insulating member and the end surface of the first end portion of the first heat-insulating member. Therefore, the occurrence of defects such as an increase in contact resistance can be fundamentally eliminated.

Third, it is possible to fundamentally remove defects caused by springback through a simple process of folding one of the opposite ends to form a folded portion before a general bonding process in which both side ends of the side heating plates overlap each other, Products can be produced. As the incidence of defective products is minimized, the costs required for waste treatment can be reduced, and the productivity of the product can be improved.

1 is a cross-sectional view showing a main part of a conventional induction heating cooker;
2 is a perspective view showing a side heating plate of a conventional induction heating cooker.
3 is a sectional view showing a connection portion of a side heating plate in a conventional induction heating cooker.
4 is an exploded cross-sectional view illustrating a connecting portion of a side heating plate in an induction heating cooker according to an embodiment of the present invention;
5 is a cross-sectional view illustrating a connection portion of a side heating plate in an induction heating cooker according to an embodiment of the present invention.
6 is a view illustrating a method of measuring a DC resistance value of a heating coil in order to calculate a contact resistance value for a connection portion of a side heating plate in an induction heating cooker according to an embodiment of the present invention.
7 is a distribution diagram showing a DC resistance value of a heating coil in comparison with a conventional induction heating cooker in a product to which a side heating plate of an induction heating cooker according to an embodiment of the present invention is applied.

Hereinafter, an induction heating cooker according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a cross-sectional view illustrating a connecting portion of a side heating plate in an induction heating cooker according to an embodiment of the present invention, FIG. 5 is a cross-sectional view illustrating a connection portion of a side heating plate in an induction heating cooker according to an embodiment of the present invention And FIG. 6 is a view illustrating a method of measuring a DC resistance value of a heating coil to calculate a contact resistance value for a connection portion of a side heating plate in an induction heating cooker according to an embodiment of the present invention. 6 is a distribution diagram showing a DC resistance value of a heating coil in a product to which a side heating plate of an induction heating cooker according to an embodiment of the present invention is applied, compared with a conventional induction heating cooker.

Here, the induction heating cooker according to the present invention has the same configuration except for the side surface heating plate 10 of FIG. 1, so that illustration thereof is omitted and the same reference numerals are used for the same configurations.

4 to 7, both end portions of the side surface heating plate 100 are coupled to each other so that two or more contact portions 111a and 111b are formed between the outer surfaces a of the side surface heating plates 100 As shown in FIG.

At this time, both end portions of the side surface heating plate 100 may be electrically connected to each other through the contact portions 111a and 111b formed in the connection portion 111. [

4 to 5, the side surface heating plate 100 is formed in a circular shape such that an elongated rectangular metal plate material surrounds the inner pot, and then both ends are joined together through seaming or the like.

Here, the induction heating cooker forms an eddy current in the inner pot 60 through a magnetic field generated in the heating coil 40 through which the high-frequency current flows, and uses the eddy current to heat the cooking object Heat it.

As the both end portions of the side surface heating plate 100 are energized, a current is also induced to flow in the side surface heating plate 100 arranged close to the heating coil 40.

At least two contact portions 111a and 111b are formed in the connecting portion 111 at both ends of the side surface heating plate 100 to prevent an increase in contact resistance due to an insufficient conductive area and a local overheating, Safety can be improved.

Here, it is preferable that the side surface heating plate 100 is provided with a conductor formed with an insulating coating layer (c) along the inner surface (b).

At this time, the inner surface (b) is a surface opposed to the outer surface of the inner pot (60) disposed therein, and a current induced when the power supply of the heating coil (40) (60).

Further, the conductor can be understood to mean a metal material having low electric or thermal resistance, and can transmit heat of the heat wire heater 80 smoothly at the time of thermal insulation.

It is preferable that a first latching part 130 is formed at one end of the side surface heating plate 100 so that the outer surface a of the side surface heating plate 100 faces each other.

The other end of the side surface heating plate 100 is folded and folded so that the inner surface b of the side surface heating plate 100 is in close contact with each other and the folded portion 121 is folded, And a second receiving portion 120 including a receiving bending portion 122 that is secondarily bent so as to face the inner surface (b) of the first receiving portion 100 is formed.

Here, the first latching part 130 and the second latching part 120 may be pressed in a staggered state so that both ends of the side surface heating plate 100 may be coupled.

At this time, both side ends of the side surface heating plate 100 form a five-layer overlapping layer, and the contact portions 111a and 111b between the outer surfaces a of the side surface heating plate 100 are formed at two places, (B) can be formed at two places.

Accordingly, even if the insulating coating layer (c) is formed on the inner surface (b) of the side surface heating plate (100), electricity can be supplied to two or more contact portions. Therefore, And can be stably performed.

At this time, the folding part 121 is inserted into the first latching part 130, and the end 131 of the first latching part 130 is inserted into the second latching part 120 It is preferable to be connected.

Therefore, the contact portions 111a and 111b between the outer surface a of both end portions of the side surface heating plate 100 can be formed inside the second latching portion 120 and outside the second latching portion 120.

Here, since the inner contact portion 111a is located inside the bending process of the side surface heating plate 100, a space in which lifting due to springback can be minimized and high adhesion can be maintained.

The outer surface of the folded portion 121 is fixed to the outer surface on the side of the end portion 131 of the first engaging portion 130 supported on the inner side of the second engaging portion 120 when the folded back portion 121 is restored by the spring back, The electric field applied between both ends of the side surface heating plate 100 can be stably maintained.

In this way, defects due to springback can be fundamentally removed through a simple process of folding one of the ends before the general bonding process in which both end portions of the side surface heating plate 100 are overlapped with each other, The cost of disposal due to the occurrence of defects is reduced, and the economical efficiency of the product can be improved.

Further, abnormal overheating due to an increase in contact resistance is prevented, so that the safety performance of the product can be improved.

Of course, in order to improve the close contact between the both end portions of the side surface heating plate 100, a press-in portion using a "v" -shaped punch is attached to the outer side portion where the first and second engagement portions 130 and 120 are connected .

The second engaging part 120 may be connected to the bent part 123 of the multi-step bent and protrude outwardly. When the first engaging part 130 and the second engaging part 120 are connected to each other, The inner surfaces b of both ends of the side surface heating plate 100 may be mutually continuous.

Accordingly, since the inside of the side surface heating plate 100 can be provided flat without protruding portions, the inner pot 60 can be prevented from being damaged when it is attached and detached, and the durability of the product can be improved.

Meanwhile, a comparison between a case where the folded portion 121 is added to the connecting portion 111 of the side heating plate 100 and a result of a plurality of experiments related to a simple connected conventional case is as follows.

Experimental Example Heating coil
DC resistance value (Ω) Cooking connection
Maximum temperature (℃) Remarks Experimental Example 1 with simple connection 1.51 133 Good Experimental Example 2 with simple connection 1.54 138 Bad Experimental Example 3 with simple connection 1.57 136 Bad Experimental Example 4 with simple connection 1.68 156 Bad For simple connections Experimental Example  medium 1.55 141 Bad Experimental Example 1 where a folded portion was formed 1.42 127 Good Experimental Example 2 in the case of forming a folded portion 1.43 128 Good Experimental Example 3 in the case of forming a folded portion 1.44 127 Good Experimental Example 4 in the case of forming a folded portion 1.45 128 Good The fold  When formed Experimental Example  Average 1.43 127 Good

7 shows DC resistance values of a heating coil 40 to which a current having a specific frequency and voltage is applied to 100 products to which a folded portion is applied and 100 products to which a conventional connection structure is applied.

In Table 1, four products are selected from the product group to which the folded portion is applied and the product group to which the conventional connection structure is applied, and the maximum temperature of the connecting portion (11 in FIG. 1, 111 in FIG. 5) Respectively. At this time, the size of each side heating plate and the area of the connecting portion are the same.

6, the contact resistance value of the connection portion between the both ends of the side surface heating plate is set so that the temperature of the side surface of the heating coil 100, It is preferable to calculate the DC resistance value of the battery 40.

In detail, the DC resistance of the heating coil 40 is changed in accordance with the contact resistance of the connection portion between the both ends in the side heating plate on which the induction current is formed, disposed adjacent to the heating coil 40 to which the power is applied.

The LCR meter 70 is connected to the heating coil 40 to supply a current having a specific frequency and voltage to the heating coil 40. The LCR meter 70 is connected to the coil base 30, The DC resistance value of the heating coil 40 can be measured in a practical use state after assembling the product, and the contact resistance value of the connection part 111 can be calculated through the measured DC resistance value.

If the DC resistance value for the poor contact resistance value is set because the DC resistance of the heating coil 40 is proportional to the contact resistance of the connection portions 11 and 111 and the induction current is formed in the side heat plates 10 and 100 The DC resistance value of the heating coil 40 is measured without directly measuring the contact resistance value of the side surface heating plate 100 with respect to the connection portion 111 to determine whether the surface heating plate 100 is defective .

Thus, compared to measuring the contact resistance of the connecting portions 11, 111 overlapping with the resistance measuring instrument by cutting the side heat plates 10, 100, it is possible to calculate the measurement value with high accuracy which is the same as the practical use state, It is possible to judge whether or not there is a defect, so that an economical quality inspection is possible.

As shown in Table 1, an allowable local maximum temperature of 135 [deg.] C is required in order to prevent damage to peripheral projections supporting the side plates.

Here, the allowable value is a value considering the deterioration of durability when the surrounding injection product is repeatedly expanded and contracted due to heat, and may vary depending on the capacity and material of the cooker. In the case of the cooker having a capacity of 10 used in this experiment, Lt; RTI ID = 0.0 > 135 C < / RTI >

At this time, when the DC resistance value of the heating coil 40 measured through the above-described method is 1.53? Or less, the local temperature rise at the connection portion between the both ends of the side heating plate can be suppressed and the safety performance of the product can be improved.

Here, the resistance value when the conventional connection structure is applied is significantly higher than the case where the folded portion is formed, and the result shows that the maximum temperature exceeding 135 ° C is obtained in most products.

In addition, as shown in FIG. 7, when the folded portion is applied, a product in which the DC resistance value of the heating coil 40 exceeds 1.53? Hardly occurs, and the deviation of the maximum value and the minimum value of the measured value is 0.04? And the product having a resistance value within the range of 0.01Ω based on 1.43Ω is more than 95%, which shows that a uniform quality product can be produced even in mass production.

On the other hand, when the conventional connection structure is applied, the DC resistance value of the heating coil 40 exceeds 1.53? In 20% or more products, and the deviation of the maximum value and the minimum value of the measurement value is also high as 0.2? Respectively.

As described above, since the folded portion 121 is applied to the connecting portion 111 between the opposite ends of the side surface heating plate 100, a product of uniform quality can be produced and the generation rate of defective products is reduced from substantially 20% %, The productivity of the product can be improved by minimizing the cost of the waste treatment due to the occurrence of defects.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

10, 100: side heating plate 20: outer base
30: coil base 40: heating coil
50: support ring 60: inner pot
70: LCR meter 80: Hot line heater
120: second latching part 121:
130:

Claims (6)

An induction heating cooker provided on an inner side of an outer base forming an enclosure and having a side heat plate formed to surround the inner pot along an upper side of a coil base accommodating an inner pot therein and a heating coil disposed below,
The side heat plates being coupled to each other such that both end portions of the side heat plates are engaged with each other so that two or more contact portions are formed between the outer surfaces of the side heat plates,
A first latching portion bent at an outer surface of the side surface heating plate so as to be opposite to each other is formed at one end of the side surface heating plate and a first folded portion is formed at the other end of the side surface heating plate so as to be in contact with each other, And a second latching portion including a receiving bending portion that is secondarily bent so that the folded portion is opposed to the inner surface of the side surface heating plate. delete The method according to claim 1,
Wherein the folding unit is inserted into the first latching unit and the end of the first latching unit is inserted into the second latching unit. The method according to claim 1,
Wherein the second latching portion is connected to the bending portion bent at the multi-step so as to protrude outwardly so that the inner surfaces of the both end portions of the side surface heating plate are mutually continuous. The method according to claim 1,
Wherein the contact resistance value of the connection portion between the both ends of the side surface heating plate is calculated by measuring a DC resistance value of the heating coil through which a current of a specific frequency and voltage is energized in a state where the side surface heating plate is seated on the coil base. Cooker. The method according to claim 1,
Wherein the side surface heating plate comprises a conductor having an insulating coating layer formed along the inner surface thereof.
KR1020150050869A 2015-04-10 2015-04-10 inductive heating apparatus for cooking KR101671901B1 (en)

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KR101671901B1 true KR101671901B1 (en) 2016-11-02

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200156181Y1 (en) 1994-10-20 1999-10-01 구자홍 Heater side of rice cooker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3996533B2 (en) * 2003-03-07 2007-10-24 松下電器産業株式会社 rice cooker
KR101079803B1 (en) * 2009-03-11 2011-11-03 쿠쿠전자주식회사 high frequency inductive heating apparatus for cooking
KR101173245B1 (en) * 2010-05-28 2012-08-10 쿠쿠전자주식회사 electromagnetic induction heating cooker and manufacturing method of cooker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200156181Y1 (en) 1994-10-20 1999-10-01 구자홍 Heater side of rice cooker

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