JP2011003490A - Induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating device in which low loss of the device is possible and cooling design is easy, while the top plate area can be utilized effectively.SOLUTION: The induction heating device is provided with a heating coil 106 which is constructed of a serial connection body of an assembly wire portion 108 consisting of an assembly wire of a plurality of conducting wires mutually insulated and a single wire portion 109 consisting of a single conducting wire, and is installed at the lower part of the top plate 103. The single wire portion 109 has a space distance between mutually adjoining single wires and at least one part is arranged between an end part 104 of the top plate 103 which installs the body 101 on the cooking table and a frame 105 which covers the end part 104 of the top plate 103 from the lower side.

Description

  The present invention relates to an induction heating apparatus such as an induction heating cooker used in general homes, offices, restaurants, factories and the like.

  Conventionally, this type of induction heating apparatus has, for example, an induction heating cooker, a heating coil capable of induction heating an object to be heated made of aluminum, copper, or a low magnetic permeability material having an electric conductivity substantially equal to or higher than these. A buoyancy that includes an electric conductor provided between the heating coil and the object to be heated and reduces the buoyancy acting on the object to be heated by the action of the magnetic field generated by the heating coil and the induced current induced in the object to be heated. A technique that has a reduction function and arranges a plurality of electrical conductors at intervals is known (see, for example, Patent Document 1).

  In addition, regarding a heating cooker, a technique is known that has an induction heating coil and an induction heating element, and controls the induction current generated in the induction heating element by supplying high-frequency current to the induction heating coil. (For example, refer to Patent Document 2).

  FIG. 4 shows a front sectional view of a conventional heating cooker body described in Patent Document 2. As shown in FIG. FIG. 5 shows a configuration diagram of the induction heating element 17 of the conventional cooking device described in Patent Document 2. 6A is a plan view showing a detailed structure of the induction heating element 17 of the conventional cooking device described in Patent Document 2, and FIG. 6B is a conventional cooking method described in Patent Document 2. The front sectional drawing of induction heating element 17 of a cooking appliance, (c) shows the front sectional view which expanded the A section of induction heating element 17 of the conventional cooking-by-heating machine indicated in patent documents 2.

  In FIG. 6, when the cooked utensil is a low resistance metal material such as aluminum or copper, the induction heating element 17 forms a closed loop by short-circuiting the terminals 17a and 17b. When the closed loop is formed, an induction current flows through the induction heating element 17 due to the magnetic flux generated by the induction heating coil 6 to generate heat.

  Joule heat generated by the induction heating element 17 indirectly heats the cooked utensil by heat conduction. In addition, when the cooked utensil is a high resistance metal material, the terminals 17a and 17b are opened, so that almost no induced current flows through the induction heating element 17.

Japanese Patent No. 3888190 JP 2007-200722 A

  However, in the conventional configuration, since the cooked utensil is indirectly heated by Joule heat generated in the induction heating element 17 forming a closed loop, if the heat transfer is not successful, the heating efficiency decreases. Or the induction heating element 17 may be melted or damaged due to a temperature rise.

In addition, the above-mentioned conventional configuration is such that an induction current flowing through the bottom of the pan is heated by heating a cooking utensil made of a low resistance metal material such as aluminum or copper without using induction heating directly using the induction heating element 17. The purpose is to prevent the pot from floating due to the interaction with the magnetic flux. Therefore, in the case of a cooked utensil made of a high resistance metal material, the induction heating element 17 does not function.

  The present invention solves the above-described conventional problems. In addition to increasing induction heating efficiency and reducing heating coil loss and facilitating cooling design, the heating coil is arranged near the top plate end. Then, it aims at providing the induction heating apparatus which can cook using the top plate area effectively.

  In order to solve the above-described conventional problems, an induction heating apparatus according to the present invention includes a main body that forms an outer shell, a top plate that is provided on an upper portion of the main body and on which an object to be heated is placed, and that protrudes from the main body to the main body on the counter And a frame that covers the end portion of the top plate from below and a series connection body of an assembly line portion made up of a plurality of insulated wires and a single wire portion made up of a single wire. A heating coil that is provided below the top plate and induction-heats the object to be heated, and the single wire portion provides a spatial distance between the adjacent single wire conductors, and at least a part is between the end of the top plate and the frame. It is arranged in.

  This makes it possible to increase the induction heating efficiency by increasing the magnetic coupling by reducing the distance between the object to be heated and the heating coil without deteriorating the insulation of the assembly line part due to overheating of the object to be heated, By reducing the heating coil current required for the same heating power, the heating coil loss can be reduced, and the cooling design of the induction heating device is facilitated.

  The induction heating device of the present invention increases the induction heating efficiency to reduce the heating coil loss and facilitates the cooling design. In addition, the heating coil is arranged near the top plate end portion to reduce the top plate area. Can be used effectively and cooked.

Schematic block diagram of the induction heating apparatus in Embodiment 1 of the present invention The enlarged view of the periphery of the top plate 103 end part 104 of the induction heating device in Embodiment 1 of the present invention Detailed configuration diagram of heating coil 106 of the induction heating apparatus according to Embodiment 1 of the present invention. Front sectional view of a conventional cooking device Configuration diagram of induction heating element of conventional cooking device (A) The top view which shows the detailed structure of the induction heating element of the conventional heating cooker, (b) Front sectional drawing of the induction heating element of the conventional heating cooker, (c) Of the induction heating element of the conventional heating cooker Front sectional view enlarging part A

A first invention is a main body constituting an outer shell, a top plate provided on an upper portion of the main body on which an object to be heated is placed, and an end portion of the top plate protruding from the main body and erected on the cooking table. And a frame that covers the end portion of the top plate from below, and a series connection body of an assembly wire portion made up of a plurality of insulated wires and a single wire portion made up of a single wire, and is provided below the top plate. A heating coil for inductively heating the object to be heated, and the single wire portion provides a spatial distance between adjacent single wire conductors, and at least a part thereof is disposed between the end of the top plate and the frame. It is a thing. As a result, since the single wire portion of the heating coil is provided between the collecting wire portion and the top plate, the distance between the object to be heated and the heating coil is reduced, and the collecting wire portion and the single wire portion are in series. Since it is connected and the number of turns of the heating coil is increased, the area of the object to be heated as viewed from the heating coil is equivalently increased, and the magnetic coupling is increased, thereby realizing efficient induction heating. At the same time, it is possible to reduce the heating coil loss by reducing the heating coil current required to keep the induction heating power generated in the heated object constant.

  Further, at least a part of the single wire portion of the heating coil made of the single wire conducting wire that can be made very thin is disposed between the end portion of the top plate and the frame. Therefore, it becomes possible to arrange the heating coil in a portion close to the top plate end without increasing the thickness of the top plate end and the frame.

  Therefore, if the outermost diameter of the heating coil is made equal to that of the conventional heating coil, the center of the heating coil approaches the top plate end, and for example, an induction heating device having a plurality of heating coils increases the distance between the heating coils. Thus, it becomes possible to heat the objects to be heated placed on the respective heating coils without interfering with each other.

  Further, even in an induction heating device having only one heating coil, the outermost diameter of the heating coil can be set larger than that of the conventional heating coil, so that the top plate area can be used effectively. It becomes possible.

  Therefore, according to the present invention, efficient induction heating is realized, the cooling design of the induction heating device is facilitated, and the top coil area is effectively utilized by arranging the heating coil near the top plate end. Can cook.

  In the second invention, in particular, the single wire portion of the first invention has a smaller impedance than the collective line portion.

  The smaller the real part (resistance) of the impedance that directly affects the heating coil loss, the smaller the heating coil loss. Further, when the heating coil current is constant, the smaller the imaginary part (inductance) of the impedance, the smaller the number of turns of the heating coil, so that the heating coil loss is reduced.

  According to the configuration of the present invention, the single line portion has a smaller impedance than the collective line portion. Further, since the single wire portion and the collective wire portion are connected in series, the heating coil current flowing through both portions is constant. Therefore, the loss of the single wire portion is smaller than that of the collective wire portion, and the cooling design of the induction heating device can be facilitated.

  In the third invention, in particular, the single wire portion of the first invention is thermally connected to an object to be heated.

  Since the single wire portion has a spatial distance between adjacent single wire conductors, even if the temperature of the single wire portion does not exceed the melting point of the metal used for the single wire, the operation as an induction heating device is not affected. Absent. Therefore, when the object to be heated is not abnormally heated, the heating efficiency can be improved by transferring the heat generated in the single wire portion to the object to be heated thermally connected to the single wire portion. It becomes possible.

  The connection of the single wire portion and the object to be heated is, for example, a configuration in which the single wire portion is pressed from the heating coil side of the top plate so that the heat generated in the single wire portion can be transmitted to the object to be heated via the top plate. Is to do.

  Further, since the heat generated in the single wire portion is transmitted to the object to be heated, the temperature rise in the single wire portion is alleviated, so that the cooling design of the induction heating device can be further facilitated.

  According to a fourth aspect of the present invention, particularly in the third aspect of the invention, the heating coil support portion for supporting the heating coil and an insulating portion fixed to the heating coil support portion are provided, and the single wire portion is provided on the top plate side of the insulating portion. It is a thing.

  In order to improve the effect of pressing the single wire portion from, for example, the heating coil side of the top plate and thermally connecting it to the object to be heated, it is necessary to press the single wire portion evenly against the top plate.

  According to the configuration of the present invention, since the single wire portion is provided on the top plate side of the insulating portion fixed to the heating coil support portion, no deflection or the like occurs. Therefore, the single wire portion can be pressed evenly against the top plate, and heat transfer from the single wire portion to the object to be heated can be improved.

  In a fifth aspect of the invention, in particular, in the fourth aspect of the invention, a heat insulating portion is provided, and the heat insulating portion is provided between the single wire portion and the insulating portion.

  As a result, the amount of heat transmitted from the single wire portion to the insulating portion, the heating coil support portion, and the collective wire portion is limited, and the heat is more easily transmitted to the top plate side. Therefore, it is possible to further improve the heat transfer from the single wire portion to the object to be heated.

  In addition, heat generation and heat radiation to the assembly line portion are generated by heat generation of the single wire portion, and there is no concern that the temperature of the assembly line portion rises and the insulation deteriorates, so that a highly reliable induction heating device can be obtained. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a schematic configuration diagram of an induction heating apparatus according to a first embodiment of the present invention.

  In FIG. 1, a top plate 103 on which an object to be heated 102 is placed is provided on an upper portion of a main body 101 that constitutes an outline of the induction heating apparatus. The top plate 103 has dimensions such that an end 104 protruding from the main body 101 is formed. Specifically, the main body 101 has a width of 57 cm, a depth of 46 cm, and a height of 22 cm. The plate shape is 75 cm wide × 52 cm deep × 4 mm thick. A portion where the top plate 103 protrudes from the main body 101 is an end portion 104.

  A nonmagnetic stainless steel frame 105 having a thickness of 1 mm is provided on the lower surface of the end portion 104 at a distance of 5 mm so that no stress is applied to the top plate 103 and the end portion 104. In a cooking table having an opening portion on which the induction heating device is placed, the main body 101 is inserted into the opening portion, and the end portion 104 and the frame 105 are configured to be installed on the cooking table.

  Below the top plate 103, a heating coil 106 for inductively heating the article to be heated 102 is provided.

An inverter 107 is connected to the heating coil 106. The inverter 107 includes a switching element or the like (not shown) inside, and supplies a high frequency current of 20 kHz to 100 kHz to the heating coil 104 by switching a supplied power source (not shown). The heating coil 106 generates a high-frequency magnetic field by a high-frequency current, and the object to be heated 10
2 is induction heated.

  The heating coil 106 is constituted by a series connection body of an assembly wire portion 108 made of litz wire, which is an assembly wire of a plurality of conductor wires insulated from each other, and a single wire portion 109 made of a single wire conductor, which is a flat copper wire. ing.

  The distance from the surface on the top plate 103 side of the assembly line portion 108 to the bottom surface of the object to be heated 102 is 8 mm, and the distance from the surface on the top plate 103 side of the single wire portion 109 to the bottom surface of the object 102 to be heated is 4 mm. ing.

  The distance from the surface on the top plate 103 side of the single wire portion 109 to the bottom surface of the object to be heated 102 is 4 mm. The thickness of the top plate 103 is 4 mm. The single wire portion 109 is the heating coil 106 of the top plate 103 as described later. This is because it is in contact with the side.

  Further, the single wire portion 109 is disposed in a 5 mm space generated in the gap between the end portion 104 of the top plate 103 and the frame 105.

  The collective line portion 108 of the heating coil 106 is fixed on the heating coil support 110 that supports the heating coil 106 with a thermosetting adhesive such as silicone.

  On the lower surface of the heating coil support 110 (the opposite side surface of the top plate 103), eight rod-shaped ferrites 111 that are radially magnetic are arranged. The ferrite 111 transmits a high-frequency magnetic field generated from the heating coil 106 to the object to be heated 102 without leaking as much as possible to prevent induction heating of parts other than the object to be heated 102 or leakage to the outside of the main body 101. It is provided for the purpose.

  FIG. 2 is an enlarged view around the end 104 of the top plate 103 of the induction heating apparatus according to the first embodiment of the present invention.

  In FIG. 2, a resin plate 112 having a thickness of 2 mm, which is also a part of the heating coil support 110, is connected to the outer periphery of the heating coil support 110 on the end 104 side of the top plate 103. Further, an insulating portion 113 having a thickness of 0.5 mm is fixed to the resin plate 112 on the top plate 103 side, and is indirectly fixed to the heating coil support portion 110. The insulating part 113 is made of mica having sufficient heat resistance.

  On the top plate 103 side of the insulating portion 113, a heat insulating portion 114 having a thickness of 2 mm made of a ceramic fiber sheet having a heat insulating effect and elasticity is disposed.

  Further, a single wire portion 109 is placed further on the top plate 103 side of the heat insulating portion 114, and the frame 105, the insulating portion 113, and the heat insulating portion 114, from the inside of the main body 101 to the surface on the heating coil 104 side of the top plate 103. It is being pressed.

  That is, the resin plate 112, the insulating portion 113, the heat insulating portion 114, the single wire portion 109, and the top plate 103 end portion 104 are arranged in this order on the top plate 103 side of the frame 105.

  FIG. 3 shows a detailed configuration diagram of the heating coil 106 of the induction heating apparatus according to the first embodiment of the present invention.

In FIG. 3, the collecting wire portion 108 is wound in a donut shape, and the single wire portion 109 is wound in a rectangular shape to form the heating coil 106. The number of turns is 1 for the set line portion 108.
Two turns and the single wire portion 109 have seven turns, and the impedance of the single wire portion 109 is smaller than that of the collective wire portion 108.

  The inner and outer diameters of the single wire portion 109 are 20 mm and 60 mm, respectively, and the inner and outer diameters of the assembly wire portion 108 are 50 mm and 180 mm, respectively.

  The collective line portion 108 is composed of two donut-shaped portions having the same circular center in order to make the heat distribution of the article to be heated 102 uniform. In each of the two donut-shaped portions, there is no space gap between adjacent turns.

  In addition, the litz wire of the assembly line portion 108 has a configuration in which 60 copper wires with a diameter of 0.3 mm whose surfaces are enamel-coated are twisted and have a thickness of about 5 mm. Since a litz wire is used, it is possible to mitigate the increase in resistance due to the skin effect and proximity effect that occur when a high-frequency current flows.

  The single wire portion 109 is composed of a flat copper wire having a width of 2 mm and a thickness of 1 mm. In addition, a spatial distance of about 1 mm is provided between adjacent single wires. Since insulation between the adjacent single wire conductors is ensured, the surface coating treatment of the single wire conductors is not performed.

  The collective line portion 108 and the single wire portion 109 are connected to each other so as to be electrically in series. Specifically, the outer peripheral terminal of the collective line portion 108 and the inner peripheral terminal of the single wire portion 109 are connected to the inverter 105, and the inner peripheral terminal of the collective wire portion 108 and the outer peripheral terminal of the single wire portion 109 are connected to each other. As seen from the inverter 107, the collective line portion 108 and the single wire portion 109 are connected in series to constitute the heating coil 106.

  Further, the winding direction is adjusted so that when the current flows through the collective line portion 108 and the single wire portion 109, the directions of the currents flowing in the portions where the collective line portion 108 and the single wire portion 109 are close to each other are the same.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the inverter 107 rectifies a supplied power supply (not shown), and then converts it into a high-frequency voltage by an on / off operation of an included switching element (not shown). The high frequency voltage is supplied to the heating coil 106 connected to the inverter 107, and a high frequency current flows. A high-frequency magnetic field is generated by the high-frequency current flowing through the heating coil 106, an eddy current is induced inside the heated object 102 placed above the heating coil 106, and the heated object 102 is heated by Joule heat.

  At this time, the single wire portion 109 of the heating coil 106 is pressed against the surface of the top plate 103 on the heating coil 106 side, and the distance from the object to be heated 102 is minimized. Therefore, the magnetic field generated from the single wire portion 109 can easily reach the object to be heated 102 without waste, the magnetic coupling between the object to be heated 102 and the single wire portion 109 is enhanced, and efficient induction heating is performed. Is possible.

  In order to efficiently induction-heat the object to be heated, it is effective to increase the magnetic coupling between the object to be heated and the heating coil. Increasing magnetic coupling means efficiently transmitting one magnetic energy to the other. As specific means, the distance between the object to be heated and the heating coil is made closer, the leakage magnetic flux leaking without contributing to induction heating is reduced, or the number of turns of the heating coil is increased equivalently. There are methods such as increasing the area of the object to be heated as seen from the heating coil.

  In the present embodiment, by increasing the magnetic coupling between the object to be heated and the heating coil, efficient induction heating is realized, and the heating coil current required to make the induction heating power generated in the object to be heated constant is set. It becomes possible to reduce heating coil loss.

  However, simply moving the heating coil closer to the object to be heated also brings the distance between the top plate and the heating coil closer, and the heat generated in the object to be heated also affects the heating coil.

  For example, in cooking such as stir-fried vegetables, the bottom surface of an object to be heated (such as a frying pan) rises to about 200 to 300 ° C., so the heating coil temperature is raised through the top plate. In addition, when a small amount of oil is used in cooking fried food such as tempura, overheating of the oil is likely to occur, and the heating coil temperature is similarly increased.

  Furthermore, the circulation of the cooling air flowing in the space between the top plate and the heating coil is hindered, so that sufficient cooling cannot be performed and the heating coil temperature rises.

  In such a case, if the heating coil temperature exceeds the heat resistance temperature, the insulating coating between turns of the heating coil is deteriorated and insulation cannot be maintained, leading to damage to the heating coil or the induction heating device.

  In the present embodiment, since the single wire portions are provided with a spatial distance between the adjacent single wire conductors, for example, even if the heat transfer from the object to be heated becomes excessive and the temperature of the single wire portion rises, the adjacent single wires There is no degradation of insulation between conductors.

  Further, the single wire portion 109 uses copper having a very high melting point (for example, about 1000 ° C. with pure copper). Further, a spatial distance is provided between the adjacent single conductors, and no special insulation coating treatment is provided.

  When the bottom of the object to be heated 102 is 200-300 ° C. in cooking such as stir-fried vegetables, or when a small amount of oil is used in cooking fried food such as tempura, etc. It is assumed that the temperature of the single wire portion 109 is increased by the heat generated by the article to be heated 102 through the top plate 103.

  In the case of the assembly wire, since it is composed of a plurality of conductive wires insulated from each other, the insulation coating deteriorates at a high temperature, and local heat generation at the deteriorated portion becomes remarkable. As a result, the conductor may be deteriorated or damaged.

  However, in the case of a single wire, there is no deterioration of the insulation coating due to high temperature, and since there is little damage to the conductor due to no local heat generation, it has sufficient heat resistance and does not affect the operation of the induction heating device .

  In addition, when the object to be heated 102 is boiled, cooking the boiled food, etc., the bottom surface temperature does not increase so much, the heat generated in the single wire portion 109 is transferred to the object to be heated 102 via the top plate 103 to increase the heating efficiency. Can be improved.

  Furthermore, since the heat insulating portion 114 is disposed below the single wire portion 109, heat transfer from the single wire portion 109 to the object to be heated 102 is further promoted, and the heat influence on the collective wire portion 108 and the like is reduced.

  Further, the heat generation of the single wire portion 109 is transmitted to the object to be heated 102, so that the temperature rise of the single wire portion 109 is alleviated.

  Since the collecting wire portion 108 and the single wire portion 109 of the heating coil 106 are connected in series, the same current flows. Since the single wire portion 109 is a single wire conductor, the increase in high-frequency resistance due to the skin effect and the proximity effect is larger than that of the collective wire portion 108. However, since the number of turns is set to be small, the single wire portion 109 as a whole has a smaller impedance (resistance, inductance) and loss than the collective wire portion 108.

  In addition, when a high-frequency current (20 kHz to 100 kHz) that is used for induction heating is supplied to a single wire heating coil, the single wire heating coil is compared with a heating coil that is composed of a plurality of conductor wires (for example, litz wire). Since the high frequency resistance is very high, the heating coil itself has a large loss and heat generation, and the induction heating efficiency is lowered.

  However, since the heating coil 106 is composed of the collective wire portion 108 and the single wire portion 109, the single wire in which the loss per unit length is larger than that of the collective wire portion 108 in the number of turns of the heating coil 106 required for induction heating. It is easy to design the number of turns so that the portion 109 is suppressed to a loss that can be cooled.

  Further, in the present embodiment, the single wire portion 109 is pressed evenly by the insulating portion 113 and the resin plate 112 through the heat insulating portion 114 without being bent against the surface of the top plate 103 on the heating coil 106 side. Therefore, the heat generated by the single wire portion 109 is efficiently transmitted to the object to be heated 102.

  Furthermore, since the resin plate 112 and the insulating portion 113 are disposed between the single wire portion 109 and the frame 105, it is easy to ensure sufficient insulation between the single wire portion 109 and the frame 105.

  The single wire portion 109 is disposed below the end portion 104 of the top plate 103.

  The top plate end and the frame projecting to mount the main body on the countertop are usually about 10 mm thick. This portion is composed of a top plate made of crystallized glass, a metal plate that is a frame for preventing stress from being applied to the top plate, and a gap between the top plate and the metal plate.

  The thickness of the top plate is about 4 mm because it is necessary to ensure the strength. The metal plate is about 1 to 2 mm. That is, the gap between the top plate and the metal plate is about 4 to 5 mm.

  In such a minute gap, it is difficult to arrange a heating coil composed of a collection line, and even if it can be arranged, the distance between the top plate and the collection line portion is very small. When heating a heated object, there is a possibility of insulation deterioration or burnout of the assembly line portion when the frying pan is baked or overheated.

  Conventionally, it is difficult to insert the heating coil 106 unless the top plate 103 surface is made higher than the cooking table. However, in the present embodiment, the single wire portion 109 has a sufficiently thin structure. Can be inserted.

  As a result, since the area of the heating coil 106 can be increased as viewed from the user, even a large object to be heated can be uniformly induction-heated. Conventionally, the end portion 104 of the top plate 103 that has become a dead space can be effectively used.

  In the present embodiment, the single wire portion 109 is a copper wire. However, the present invention is not limited to this, and any wire may be used as long as it has sufficient heat resistance as compared with the abnormal temperature of the article to be heated 102.

  For example, aluminum which is a low-resistance nonmagnetic metal can be given as an example. In the case of copper, the surface may be rusted, but in the case of aluminum, a natural oxide layer is formed on the surface, and the surface changes little, and a high degree of contact with the top plate 103 can be maintained. Aluminum is less expensive than copper.

  Further, the single wire portion 109 may be a multilayer of a plurality of flat conductors. In this case, since the flat conductor can be mass-produced at high speed by a punching method, the manufacture becomes easy.

  Further, if a high thermal conductive material is inserted between the top plate 103 and the single wire portion 109 in order to further transfer the heat generated in the single wire portion 109 to the object to be heated 102, unevenness of the single wire portion 109 against the top plate 103 is caused. It is possible to reduce.

  Moreover, although the example which incorporates the one heating coil 106 in the main body 101 was given, you may incorporate the some heating coil 106, for example. When two heating coils 106 are built in, the distance between the heating coils 106 can be set large by arranging the heating coils 106 closer to the end 104 of the top plate 103. Even when a large object to be heated 102 is placed on each heating coil 106, it does not interfere with each other and is easy to use.

  In this embodiment, the insulating portion 113 and the resin plate 112 are arranged below the single wire portion 109. However, an aluminum plate or the like that is a nonmagnetic low-resistance metal is inserted between the insulating portion 113 and the resin plate 112. For example, it is possible to suppress induction heating of the frame 105 further below the resin plate. Further, the frame 105 itself may be composed of an aluminum plate or the like that is a nonmagnetic low resistance metal.

  Further, if ferrite or the like, which is a magnetic material, is inserted between the insulating portion 113 and the resin plate 112, the leakage magnetic field can be reduced and the magnetic field can be efficiently transmitted to the object to be heated 102.

  As described above, the induction heating apparatus according to the present invention can reduce the loss of the apparatus, and can provide an induction heating apparatus that facilitates cooling design. It can also be applied to uses such as induction heating water heaters, induction heating irons, and other induction heating heating devices.

DESCRIPTION OF SYMBOLS 101 Main body 102 To-be-heated object 103 Top plate 104 End part 105 Frame 106 Heating coil 108 Assembly line part 109 Single line part 110 Heating coil support part 113 Insulation part 114 Heat insulation part

Claims (5)

A main body constituting an outer shell, a top plate provided on an upper portion of the main body on which an object to be heated is placed, an end of the top plate protruding from the main body and erected on the cooking table, and an end of the top plate The object to be heated is configured by a serial connection body of a frame that covers a portion from below, an assembly line portion composed of assembly wires of a plurality of conductors insulated from each other, and a single wire portion composed of a single wire conductor, and is provided below the top plate A heating coil for induction heating, wherein the single wire portion provides a spatial distance between adjacent single wire conductors, and at least part of the single wire portion is disposed between the end of the top plate and the frame. The induction heating apparatus according to claim 1, wherein the single wire portion has a smaller impedance than the collective wire portion. The induction heating device according to claim 1, wherein the single wire portion is thermally connected to an object to be heated. The induction heating apparatus according to claim 3, further comprising: a heating coil supporting portion that supports the heating coil; and an insulating portion fixed to the heating coil supporting portion, wherein the single wire portion is provided on the top plate side of the insulating portion. . The induction heating device according to claim 4, further comprising a heat insulating portion, wherein the heat insulating portion is provided between the single wire portion and the insulating portion.

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