CN106793228B - Coil disc, manufacturing method thereof and electromagnetic heating equipment - Google Patents

Coil disc, manufacturing method thereof and electromagnetic heating equipment Download PDF

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Publication number
CN106793228B
CN106793228B CN201510817760.6A CN201510817760A CN106793228B CN 106793228 B CN106793228 B CN 106793228B CN 201510817760 A CN201510817760 A CN 201510817760A CN 106793228 B CN106793228 B CN 106793228B
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China
Prior art keywords
conductive metal
metal sheet
coil
bracket
electromagnetic heating
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CN201510817760.6A
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CN106793228A (en
Inventor
杨玲
曹达华
梅若愚
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Priority to CN201510817760.6A priority Critical patent/CN106793228B/en
Priority to PCT/CN2015/096055 priority patent/WO2017084115A1/en
Publication of CN106793228A publication Critical patent/CN106793228A/en
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/36Coil arrangements

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • General Induction Heating (AREA)
  • Cookers (AREA)

Abstract

The invention discloses a coil panel, a manufacturing method thereof and electromagnetic heating equipment, wherein the coil panel comprises: the coil comprises a bracket and a coil attached to the bracket, wherein the coil is a conductive metal sheet extending according to a preset winding path. The coil in the coil panel is the conductive metal sheet extending according to the preset winding path and is attached to the bracket, so that coils with various required shapes can be formed on the bracket, the production of the coil panel is more flexible, the development period for changing the coil is shortened, and the cost is saved.

Description

Coil disc, manufacturing method thereof and electromagnetic heating equipment
Technical Field
The invention relates to the technical field of household appliances, in particular to a coil panel, a manufacturing method thereof and electromagnetic heating equipment.
Background
The coil panel is the most important component of various microwave heating household appliances, which not only affects the manufacturing cost of the appliances, but also is a key factor for determining the quality of the household appliances. In household appliances such as a conventional electric cooker and an induction cooker, an electromagnetic heating coil panel in an electromagnetic induction heating technology is mostly adopted to heat and cook food. The electromagnetic coil panel is heated based on the magnetic field induction eddy current principle, high-frequency alternating current is utilized to pass through the annular coil, so that a closed magnetic field is generated, when magnetic lines of force pass through the bottom of the magnetic conduction cooker, the magnetic lines of force are cut, and countless small eddy currents can be generated to heat the cooker.
The heating coil in the coil panel of the small household appliance heated by the electromagnetic induction heating technology is wound by the enameled wire, the winding process is complex, the poor manufacturing procedures such as wire jumping, scratching and short wire are easy to occur, the coil is single in form, the flexible processing of the coil cannot be realized, and the development period is longer when the coil needs to be changed.
Disclosure of Invention
The invention aims to provide a coil disc, a manufacturing method thereof and electromagnetic heating equipment, which realize the processing flexibility of a coil, shorten the development period of changing the coil and save the cost.
To this end, in a first aspect, the present invention provides a coil disc including a support and a coil attached to the support, the coil being a conductive metal sheet extending according to a predetermined winding path.
Optionally, the bracket is formed by injection molding, and the coil is attached to the bracket in the injection molding process of the bracket.
Optionally, the surface of the conductive metal sheet far away from the bracket is covered with a protective layer.
Optionally, the thickness range of the conductive metal sheet is 0.2mm to 0.5 mm.
Optionally, the conductive metal sheet is in an archimedes spiral shape, the width range of each circle of the conductive metal sheet is 1 mm-3 mm, and the gap range between adjacent circles of the conductive metal sheet is 0.5 mm-2 mm.
Optionally, the support is disc-shaped or bowl-shaped.
Optionally, the conductive metal sheet is made of copper, silver or aluminum.
In a second aspect, the invention provides an electromagnetic heating device comprising the coil disc described above.
In a third aspect, the present invention further provides a method for manufacturing a coil disc, including the steps of:
placing a conductive metal plate in a first mold;
injecting the plastic into the first mold to form a bracket for the conductive metal plate to be attached;
and cutting the conductive metal plate to form a conductive metal sheet extending according to a preset winding path.
Optionally, after the step of cutting the conductive metal plate to form a conductive metal sheet extending according to a predetermined winding path, the method includes:
and placing the bracket attached with the conductive metal sheet in a second mold, and performing injection molding in the second mold to form a protective layer covering the conductive metal sheet.
Optionally, before placing the conductive metal plate in the first mold, the method includes:
and stamping the conductive metal plate to enable the conductive metal plate to be matched with the shape of the first die.
In a fourth aspect, the present invention further provides a method for manufacturing a coil disc, including the steps of:
placing a conductive metal sheet in a third die, the conductive metal sheet extending according to a predetermined winding path;
and injecting the mixture into the third mold to form a bracket for the conductive metal sheet to be attached.
Optionally, the step of injection molding in the third mold to form the bracket to which the conductive metal sheet is attached includes:
and placing the bracket attached with the conductive metal sheet in a fourth mold, and performing injection molding in the fourth mold to form a protective layer covering the conductive metal sheet.
The invention provides a coil panel, a manufacturing method thereof and electromagnetic heating equipment, wherein the coil in the coil panel is a conductive metal sheet extending according to a preset winding path and is attached to a bracket, so that coils with various required shapes can be formed on the bracket, the production of the coil panel is more flexible, the development period of changing the coil is shortened, and the cost is saved.
Drawings
Fig. 1 is a top view of a coil disk according to an embodiment of the present invention;
FIG. 2 is a top view of a bracket according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a coil disk in the direction A-A of FIG. 1 according to an embodiment of the present invention;
FIG. 4 is a top view of a coil disk with a protective layer attached thereto according to an embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a method for manufacturing a coil disk according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a conductive metal plate disposed in a first mold according to an embodiment of the present invention;
FIG. 7 is a top view of an integrated structure of a conductive metal plate and a bracket according to an embodiment of the present invention;
fig. 8 is a schematic flow chart illustrating a method for manufacturing a coil disk according to another embodiment of the present invention;
fig. 9 is a top view of a conductive metal plate according to an embodiment of the present invention;
fig. 10 is a schematic flow chart illustrating a method for manufacturing a coil disk according to another embodiment of the present invention;
fig. 11 is a top view of a conductive metal sheet 3 according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of placing a conductive metal sheet in a third mold according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a top view of a coil panel according to an embodiment of the present invention, as shown in fig. 1, the coil panel includes a support 1 and a coil 2 attached to the support 1, wherein the coil 2 is a conductive metal sheet 3 extending according to a predetermined winding path.
Wherein, because the coil 2 is the conductive metal sheet 3 extending according to the predetermined winding path, it can also be understood that the conductive metal sheet 3 in this embodiment is the coil 2, as shown in fig. 2, the bracket 1 can be formed by injection molding in a mold, the coil 2 is attached to the bracket 1 in the injection molding process of the bracket 1, that is, the conductive metal sheet 3 is attached to the bracket 1, of course, it can also be that the conductive metal plate to be formed into the coil is attached to the bracket 1 in the injection molding process of the bracket 1, and then the conductive metal plate is processed to form the conductive metal sheet 3, the conductive metal sheet 3 formed in the above two cases will be integrally formed with the bracket 1, so that the formed coil disc is lighter and thinner, and the conductive metal sheet 3 can be understood as being made of the conductive metal plate by CNC (Computer Numerical Control, abbreviated as follows) processing or punch forming, therefore, the conductive metal sheets 3 with various required shapes can be formed on the bracket 1, the flexible processing of the coil 2 is realized, and in addition, the coil processed by CNC processing or punch forming is faster than the mode of winding the coil in the prior art, the development period of changing the coil is shortened, and the labor cost is saved.
In addition, compared with the prior art that the coil 2 is manufactured by winding an enameled wire, the conductive metal sheet 3 avoids the problems of poor phenomena of wire jumping, scratching, wire breakage and the like and single form of winding the coil when the coil is manufactured by winding the enameled wire.
The conductive metal sheet 3 is generally made of a metal material, and may be made of a metal material having good stability and a thickness tolerance that can be controlled within ± 0.05mm, such as copper, silver or aluminum, in order to make the coil panel have good heat dissipation performance, the carrier material is beryllium copper, in addition, in order to achieve the lightness and thinness of the coil panel, the conductive metal sheet may be made of a conductive metal plate, such as a copper plate, by machining or punch forming, and the thickness range of the copper plate, that is, the thickness range of the conductive metal sheet, is 0.2mm to 0.5 mm.
The shape of the bracket 1 is bowl-shaped or disc-shaped, for an electric cooker and an electric pressure cooker, the bracket 1 is bowl-shaped, for an electromagnetic oven, the bracket 1 is disc-shaped, certainly, other shapes can be also adopted, the conductive metal sheet 3 is in an Archimedes spiral line shape, the width range of each circle of the conductive metal sheet 3 is 1-3 mm, and the gap range between adjacent circles of the conductive metal sheet 3 is 0.5-2 mm, so that the insulation between adjacent circles of a coil is ensured while the conductive performance of the coil is met. Of course, the shape, width, thickness, spacing and number of turns of the conductive metal sheet 3 can be changed according to the needs of the actual product, and the shape, width, thickness, spacing and number of turns of the conductive metal sheet are not limited in this embodiment.
The cross section of the groove, i.e. the wire groove 4, between each adjacent circle of the conductive metal sheet 3 is generally rectangular, as shown in fig. 3, of the conductive metal sheet 3 formed by CNC machining, but the shape of the conductive metal sheet also varies with the shape of the tool installed on the CNC and the width of the cutting edge.
Since the conductive metal sheet 3 in the coil disc of fig. 1 is entirely exposed, in order to prevent the conductive metal sheet 3 from being entirely exposed and enhance the waterproof performance and the oxidation resistance of the coil disc, the coil disc in this embodiment may further include a protective layer 5 covering the surface of the conductive metal sheet far away from the support through an in-film injection molding process, as shown in fig. 4, the protective layer 5 is provided with wiring holes 51 and 52 exposing the wiring terminals of the conductive metal sheet, the wiring holes 51 and 52 are respectively used for exposing the two wiring terminals of the conductive metal sheet 3, the protective layer 5 prevents the conductive metal sheet 3 from being entirely exposed, and enhances the waterproof performance and the oxidation resistance of the coil disc. Certainly, the protective layer 5 may not include the wiring holes 51 and 52, and the two wiring terminals of the conductive metal sheet 3 may respectively leak out at two edges, namely, the edge a and the edge b, of the protective layer 5.
The embodiment of the invention also provides electromagnetic heating equipment which comprises the coil panel.
The coil panel is used on a product adopting an IH heating mode, and the magnetic line of the IH coil heats the inner pot, so that food is heated uniformly and quickly.
The electromagnetic heating equipment is, for example, an electromagnetic oven, a frying and copying machine, a soybean milk machine, an electric kettle, a coffee machine, an electric stewing pot, an electric cooker, an electric pressure cooker and the like, and cooks food by the electromagnetic induction principle. The coil panel is thinner and lighter than the traditional coil panel, and the flexibility of design and manufacture is realized.
The embodiment of the present invention further provides a schematic flow chart of a manufacturing method of a coil disc, as shown in fig. 5, including the following steps:
501. the conductive metal plate 6 is placed in a first mold.
As shown in fig. 6, the first mold 7 may include a lower mold 71 and an upper mold 72, and the conductive metal plate 6 is placed on the lower mold 71 of the first mold 7 to be positioned, for example, the mold may be provided with a marking position when the mold is designed, or a holder for fixing the conductive metal plate 6, or the like, so that the conductive metal plate is not loosened during the mold clamping process after the placement.
The upper die 72 and the lower die 71 are closed, and plastic is injected into the cavities of the upper die 72 and the lower die 71, the material of the plastic is not limited in this embodiment, and the plastic can be general plastic in the prior art, it can be understood that after the upper die 72 and the lower die 71 are closed, the cavity between the upper die 72 and the lower die 71 is a cavity with a predetermined shape, the conductive metal plate 6 is placed into the cavity, and then the plastic is injected into the cavity, so as to form an integrated structure of the conductive metal plate 6 and the bracket 1.
Wherein, the conditions for injection molding plastic cement can be as follows: taking PBT plastic as an example, the injection temperature is 180-300 ℃, the injection pressure is 90-160 Mpa, and the injection cycle is 20-35 s, and specifically, different injection temperatures, injection pressures, and injection cycles can be selected according to different plastic materials, and this embodiment is only used for illustration and is not limited thereto.
502. Injection molding is performed in the first mold 7 to form the bracket 1 to which the conductive metal plate 6 is attached.
As shown in fig. 7, after injection molding through step 501, the conductive metal plate 6 is attached to the bracket 1.
503. The conductive metal plate 6 is cut to form the conductive metal sheet 3 extending along a predetermined winding path on the conductive metal plate 6, and the conductive metal plate is processed by a numerical control machine according to a predetermined tool path, for example, as shown in fig. 1.
It should be noted that the sequence of steps 502 and 503 may also be interchanged, i.e. the protective layer is attached to the conductive metal plate by two-shot molding, and then the conductive metal plate is cut to form the conductive metal sheet extending according to the predetermined winding path.
The conductive metal sheet 3 is in the shape of an archimedean spiral line with the center of the bracket 1 as the center and according to a predetermined winding path, and of course, other shapes are possible, and this embodiment does not limit the specific shape thereof, wherein one end of the conductive metal sheet 3 close to the center of the bracket 1 is provided with a first wiring contact, and one end of the conductive metal sheet 3 far away from the center of the bracket 1 is provided with a second wiring contact.
It is understood that the shape of the first mold 7 in fig. 6 is not limited in this embodiment, and the embodiment only uses the schematic diagram of fig. 6 for better illustration, that is, the first mold 7 in fig. 6 can be various shapes suitable for production, and the opening for injecting plastic can also be suitable for production, and the first mold diagram in this embodiment is only for illustration.
As shown in fig. 8, before the above step 501 is placed in the first mold 7, the method further comprises the steps of:
500. and stamping the conductive metal plate 6 to enable the conductive metal plate 6 to be matched with the shape of the first die 7.
In step 500, the conductive metal plate 6 may be a copper sheet, which has good conductivity, good heat dissipation, stable performance, and is light and thin.
As shown in fig. 9, which is a plan view of the conductive metal plate 6, the conductive metal plate 6 may have a bowl-like or disk-like shape, and the carrier may have a bowl-like shape for an electric rice cooker or an electric pressure cooker or a disk-like shape for an induction cooker, but may have other shapes.
After the step 500 is executed, the step 501-503 is executed, and after the step 503 of performing cutting processing on the conductive metal plate to form the conductive metal plate extending according to the predetermined routing path, the method further includes:
504. the holder with the conductive metal sheet 3 attached thereto is placed in a second mould in which injection moulding is performed to form a protective layer 5 covering the conductive metal sheet 3, i.e. the protective layer 5 is also made of plastic, the formed coil disc being shown in fig. 4.
The protective layer 4 prevents the whole conductive metal sheet 3 from being exposed, and enhances the waterproof performance and the anti-oxidation performance of the coil panel.
In another realizable mode, the coil disk manufacturing method can also be manufactured through the following steps, as shown in fig. 10, specifically including the following steps:
101. the conductive metal sheet 3 is placed in a third mold 8, said conductive metal sheet 3 extending according to a predetermined winding path.
In this embodiment, first, the conductive metal plate 6, or the conductive metal plate 6 may be understood as the conductive metal plate 6 after being stamped according to actual production, a plan view of the conductive metal plate 6 is shown in fig. 9, the conductive metal plate 6 is machined into the conductive metal sheet 3 by CNC machining or punch forming, a plan view of the conductive metal sheet 3 is shown in fig. 11, and the conductive metal sheet 3 is placed in the third mold 8, as shown in fig. 12. It is understood that the shape of the third mold 8 in fig. 12 is not limited in this embodiment, and for better illustration, the embodiment only uses the schematic diagram in fig. 12, that is, the third mold 8 in fig. 12 can be in various shapes suitable for production, and the opening for injecting plastic can also be suitable for production, and the third mold diagram in this embodiment is only used for illustration.
102. And (3) performing injection molding in the third mold 8 to form the bracket 1 for attaching the conductive metal sheet 3, as shown in fig. 1.
It can be understood that, the coil panel manufactured in this embodiment is different from the process in fig. 8 in that, in the coil panel manufactured in this embodiment, the conductive metal sheet 3 is formed first, and then the conductive metal sheet 3 is attached to the bracket 1 by means of in-mold injection molding, and the bracket 1 is molded while being in-mold injection molded; in fig. 8, the conductive metal plate 6 of the conductive metal sheet 3 to be formed is attached to the bracket 1 by in-mold injection molding, and the bracket 1 is molded while being in-mold injection molding; then, the conductive metal plate is processed to form the conductive metal sheet 3. Of course, in the present embodiment, the conductive metal sheet 3 may be formed by CNC machining or stamping, and the detailed description of the present embodiment is omitted.
Also, in order to enhance the waterproof and oxidation-resistant properties of the coil disc, after the step 102 of injection molding in the third mold to form the bracket to which the conductive metal sheet is attached, the method includes the steps not shown in fig. 10:
the holder 1 with the conductive metal sheet 3 attached thereto is placed in a fourth mold in which injection molding is performed to form a protective layer 5 covering the conductive metal sheet, as shown in fig. 4
The coil disk formed by the above-mentioned fig. 8 and fig. 10 can realize the flexible processing of the conductive metal sheet 3, shorten the development period of the coil disk and save the cost,
furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (7)

1. An electromagnetic heating coil panel for a cooking appliance, comprising a support and a coil attached to the support, the coil being a conductive metal sheet extending according to a predetermined winding path; the bracket is formed by injection molding, the coil is attached to the bracket in the injection molding process of the bracket, and the coil and the bracket are integrally formed; the surface of the conductive metal sheet far away from the support is covered with a protective layer.
2. An electromagnetic heating coil panel for a cooking appliance as claimed in claim 1, wherein the thickness of the conductive metal sheet is in the range of 0.2mm to 0.5 mm.
3. An electromagnetic heating coil disk for a cooking appliance as claimed in claim 1, wherein said conductive metal sheet is in the shape of an archimedean spiral, the width of said conductive metal sheet per turn ranges from 1mm to 3mm, and the gap between adjacent turns of said conductive metal sheet ranges from 0.5mm to 2 mm.
4. An electromagnetic heating coil panel for a cooking appliance as claimed in any one of claims 1 to 3, wherein the support is in the form of a disc or bowl.
5. An electromagnetic heating coil panel for a cooking appliance as claimed in any one of claims 1 to 3, wherein the material of the conductive metal sheet is copper, silver or aluminum.
6. An electromagnetic heating apparatus for a cooking appliance, characterized by comprising the electromagnetic heating coil panel for a cooking appliance according to any one of claims 1 to 5.
7. A method for manufacturing an electromagnetic heating coil panel for a cooking appliance, comprising the steps of:
placing a conductive metal sheet in a third die, the conductive metal sheet extending according to a predetermined winding path;
injecting the plastic into the third mold to form a bracket for the conductive metal sheet to be attached to, wherein the conductive metal sheet and the bracket are integrally formed;
and placing the bracket attached with the conductive metal sheet in a fourth mold, and performing injection molding in the fourth mold to form a protective layer covering the conductive metal sheet.
CN201510817760.6A 2015-11-20 2015-11-20 Coil disc, manufacturing method thereof and electromagnetic heating equipment Active CN106793228B (en)

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CN201510817760.6A CN106793228B (en) 2015-11-20 2015-11-20 Coil disc, manufacturing method thereof and electromagnetic heating equipment
PCT/CN2015/096055 WO2017084115A1 (en) 2015-11-20 2015-11-30 Coil plate and method for manufacturing same, and electromagnetic heating device

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Application Number Priority Date Filing Date Title
CN201510817760.6A CN106793228B (en) 2015-11-20 2015-11-20 Coil disc, manufacturing method thereof and electromagnetic heating equipment

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CN106793228B true CN106793228B (en) 2020-12-22

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CN109757000A (en) * 2017-11-08 2019-05-14 佛山市顺德区美的电热电器制造有限公司 The processing method of coil panel component, heating utensil and coil panel component
CN109757001A (en) * 2017-11-08 2019-05-14 佛山市顺德区美的电热电器制造有限公司 Coil panel component and cooking apparatus
CN110167225A (en) * 2018-02-10 2019-08-23 佛山市顺德区美的电热电器制造有限公司 The processing method of coil panel component, heating utensil and coil panel component
CN108966387A (en) * 2018-07-20 2018-12-07 湖州练市飞迪电器塑料有限公司 Use electromagnetic heater made of environment-protective sealing type electromagnetic wire
CN112807770A (en) * 2020-12-30 2021-05-18 第一环保(深圳)股份有限公司 Heat-resistant electromagnetic heating plate
WO2022206258A1 (en) * 2021-04-02 2022-10-06 青岛海尔滚筒洗衣机有限公司 Electromagnetic heating module, manufacturing process, and clothes treatment device

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