JP2008282559A - Induction heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating device in which the self heat generation of a heating coil is reduced. <P>SOLUTION: A strip shaped copper wire constituted of a plurality of copper wires which are bundled, together to make a cross-sectional shape of a heating coil an approximately flat ellipse cross-section is wound overlapping in the short radial direction; and as a result, tightness between the coils is improved and a heating efficiency is improved and magnetic flux leakage is reduced and heating in the coil becomes uniform and partial heat generation of the coil is reduced, and the function for cooling the heating coils can be dispensed with. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an induction heating device used in general homes or business use.

Conventionally, this type of induction heating device has been configured by twisting enameled wires in which the outer periphery of a copper wire is covered with an insulator (see, for example, Patent Document 1).
JP 2002-358840 A

  However, in the conventional configuration, the enameled wires are twisted or bundled, so it is necessary to send a lot of wind to the heating coil in order to cool the heat generated by self-heating by passing current through the enameled wires. There was a problem that there was.

  In addition, in order to increase the number of windings, the diameter of one spiral shape becomes too large, so it may be necessary to wind up in multiple layers, and the coupling coefficient from the lower winding part to the pan etc. will be reduced, that is, There was a problem that the magnetic flux did not sufficiently reach the pan, the heating efficiency was deteriorated, and at the same time the leakage of electromagnetic waves into the space was increased.

  The present invention solves the above-mentioned conventional problems, and reduces the self-heating of the heating coil and not only cools the generated heat with the cooling air but also a cooling pipe provided in the process of forming the heating coil. It is an object of the present invention to provide an induction heating device that can cool the heating coil by passing the coil, further improve the heating efficiency, and can arbitrarily adjust the diameter of the coil.

  In order to solve the above-described conventional problems, an induction heating apparatus according to the present invention includes a substantially flat heating coil in a main body, and heats an object to be heated via a top plate provided on the top surface of the main body. In the apparatus, the cross-sectional shape of the heating coil is configured such that a plurality of copper wires are bundled and a strip-like copper wire having a substantially elliptical flat cross section is overlapped and wound in the minor axis direction.

  As a result, the adhesion between the coils is improved, the heating efficiency is improved, the leakage magnetic flux is reduced, the heat generation in the coil is uniformed, the local coil heat generation is reduced, and the heating coil is cooled. Functions can be reduced.

  In addition, in the induction heating apparatus of the present invention, the heating coil is formed by flattening a copper wire whose outer periphery is coated with an insulating material into a cylindrical shape, or a copper wire whose outer periphery is coated with an insulating material is formed into a cylindrical shape. The structure is made by twisting and processing to make it flat.

  As a result, the adhesion between the coils is improved, the heating efficiency is improved, the leakage magnetic flux is reduced, the heat generation in the coil is uniformed, the heat generation in the local coil is reduced, and the heating coil is cooled. It becomes possible to reduce the function, and further, by adjusting the shape to be processed flat, the diameter of the coil is adjusted and the heating area is adjusted, so that the heating area can be made more uniform.

  In the induction heating apparatus of the present invention, the heating coil is formed by welding a copper wire having an outer periphery covered with an insulator to a cylindrical member having a fusion material or a fusion material formed in a cylindrical shape. Alternatively, it is configured such that a copper wire whose outer periphery is coated with an insulating material is twisted along the outer periphery and processed into a cylindrical member having a fusion material or a fusion material.

  As a result, the heating coil is fused and solidified by the fusion material simultaneously with the process of forming the heating coil, so that the heating coil can be formed instantaneously. Furthermore, the diameter of the coil wound up can be adjusted by adjusting the flatness ratio processed into flatness, and a heating area can be adjusted and it can heat more uniformly.

  Further, the heating coil of the induction heating device of the present invention is an enamel formed by covering the outer periphery of a copper wire with an insulator and covering the outer periphery of the insulator with a self-bonding material or a part of the entire periphery. The wire is knitted and processed or twisted and processed.

  As a result, by supplying current to the heating coil at the same time as forming the heating coil, the fusion material is melted by the heat generated by self-heating, and the heating coil is instantly fused and solidified. Can improve productivity.

  In addition, the heating coil of the induction heating device of the present invention is a braided material formed in a cylindrical shape or a cylindrical member having a fused material, or a copper wire whose outer periphery is coated with an insulator is knitted along the outer periphery, Alternatively, a cylindrically formed fusion material or a cylindrical member having a fusion material is processed by twisting a copper wire coated with an insulator on the outer circumference along the outer circumference, and the fusion material is flattened in a hollow state. It is made into the structure which processed into a simple cross-sectional shape and formed the hollow cooling pipe which opened both ends.

  Thus, when cooling the self-heating of the heating coil, it is possible not only to cool the outer surface of the heating coil but also to cool from the inside of the heating coil via the refrigerant.

  Moreover, the induction heating device of the present invention is configured to include a refrigerant transport pump for allowing the refrigerant to pass through a hollow cooling pipe.

  This makes it possible to cool not only the heat from the outer surface of the heating coil but also the heat generated by self-heating of the heating coil from the inside of the heating coil via the refrigerant.

  Moreover, the induction heating device of the present invention has a configuration in which the refrigerant is formed of air.

  Thus, it becomes possible to cool from the inside of the heating coil via the outer surface of the heating coil and the cooling pipe by the cooling air.

  Furthermore, the induction heating device of the present invention includes a refrigerant transport pump for allowing the refrigerant to pass through the cooling pipe, and a heat exchange device that forms a closed circuit with the refrigerant transport pump and the cooling pipe. is there.

  This not only cools the heat generated by the heating coil's self-heating from the outer surface of the heating coil, but also reduces the noise caused by the cooling air by transporting the generated heat from the inside of the heating coil to the heat exchanger by the refrigerant. In addition, it is possible to arbitrarily design the heat dissipation position of the heat exchanger, so that it is possible to provide a product that is easy to use and excellent in design.

  In the induction heating device of the present invention, the close contact between the coils is improved, the heating efficiency is improved, the leakage magnetic flux is reduced, the heat generation in the coil is uniform, and the local coil heat generation is reduced. The function of cooling the heating coil can be reduced.

  A first aspect of the present invention is an induction heating apparatus in which a substantially flat heating coil is built in a main body, and an object to be heated is heated via a top plate provided on the top surface of the main body. Adopting a configuration in which strips of copper wires with a substantially elliptical flat cross-section are bundled together and wound in the minor axis direction, the adhesion between the coils is improved, heating efficiency is improved, and leakage flux is reduced. Further, the heat generation in the coil becomes uniform, the local coil heat generation is reduced, and the function of cooling the heating coil can be reduced.

  In the second invention, in particular, the heating coil is formed by knitting a copper wire whose outer periphery is coated with an insulating material into a cylindrical shape and processing it into a flat shape, or a copper wire whose outer periphery is coated with an insulating material is twisted into a cylindrical shape. By making the structure processed into a flat shape, the adhesion between the coils is improved, the heating efficiency is improved, and the leakage magnetic flux is reduced. Further, the heat generation in the coil becomes uniform, the local coil heat generation is reduced, and the function of cooling the heating coil can be reduced. Furthermore, by adjusting the shape to be processed flat, the diameter of the coil is adjusted to adjust the heating area, so that a more uniform heating area can be obtained.

  According to a third aspect of the present invention, in particular, the heating coil is formed in a cylindrical shape having a fusion material or a cylindrical member having a fusion material, and a copper wire whose outer periphery is coated with an insulator is braided along the outer periphery, or Adhesion between coils can be achieved by forming a cylindrically-formed fusion material or a cylindrical member having a fusion material by twisting a copper wire coated with an insulator on the outer circumference along the outer circumference. It is possible to improve the heating efficiency, reduce the magnetic flux leakage, make the heat generation in the coil uniform, reduce the local coil heat generation, and reduce the function of cooling the heating coil. is there. Furthermore, by adjusting the shape to be processed flat, the diameter of the coil is adjusted to adjust the heating area, so that a more uniform heating area can be obtained.

  According to a fourth aspect of the present invention, in particular, the heating coil is an enameled wire formed by covering an outer periphery of a copper wire with an insulator, and covering the outer periphery of the insulator with a self-bonding material so as to cover the entire periphery or part of the entire periphery By knitting and processing the wire, or twisting and processing it, the current flows through the heating coil simultaneously with the processing to form the heating coil, so that the fusion material melts with the heat generated by the self-heating and instant heating Since the coil is fused and solidified, a heating coil can be formed instantaneously, and productivity can be improved.

  According to a fifth aspect of the present invention, in particular, the heating coil is formed in a cylindrical shape having a fusion material or a cylindrical member having a fusion material, and a copper wire whose outer periphery is coated with an insulator is braided along the outer periphery, or A cylindrical member having a fusion material or a fusion material formed in a cylindrical shape is processed by twisting a copper wire coated with an insulator on the outer periphery along the outer periphery, and the fusion material is flat in a hollow state. When cooling the self-heating of the heating coil by forming a hollow cooling pipe that is processed into a cross-sectional shape and opened at both ends, not only the outer surface of the heating coil is cooled, but also the refrigerant from the inside of the heating coil. Can be cooled through.

  In the sixth aspect of the invention, in particular, a structure including a refrigerant transport pump for allowing the refrigerant to pass through the hollow cooling pipe not only cools the heat generated by the self-heating of the heating coil from the outer surface of the heating coil. It can cool through the refrigerant from the inside of the heating coil.

  According to the seventh aspect of the invention, in particular, by using a configuration in which the refrigerant is formed of air, the cooling air can cool the inside of the heating coil via the outer surface of the heating coil and the cooling pipe.

  According to an eighth aspect of the present invention, there is provided a configuration including a refrigerant transport pump for passing a refrigerant through a cooling pipe, and a heat exchange device that forms a closed circuit with the refrigerant transport pump and the cooling pipe. In addition to cooling the heat generated by the coil's self-heating from the outer surface of the heating coil, the generated heat is transported from the inside of the heating coil to the heat exchanger by the refrigerant, thereby reducing noise caused by cooling air. Since the heat dissipating position of the heat exchanger can be arbitrarily designed, it is economical to provide a product that is easy to use and excellent in design.

  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 is a cross-sectional view of a heating coil of the induction heating apparatus according to the first embodiment of the present invention. FIG. 2 is a perspective view of the heating coil of the induction heating apparatus according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view of the main body of the induction heating apparatus according to the first embodiment of the present invention. FIG. 4 is an exploded perspective view of the induction heating apparatus in the first embodiment of the present invention.

  In FIG. 4, a top plate 3 made of crystallized glass can be attached to and detached from a top surface 2 of a substantially rectangular parallelepiped main body 1. A heating coil 4 is disposed in the main body 1 below the top plate 3 so as to be positioned on the left and right. Below the left heating coil 4, a grill 5 for grilling fish and the like is disposed, and a door 6 for taking in and out the food from the front of the main body 1 is provided. As shown in FIG. 3, a control circuit 7 for supplying and controlling electric power to the heating coil 4 is arranged below the right heating coil 4 in a two-layer structure. The first-layer control circuit 7 controls power supply to the right heating coil 4. The control circuit 7 in the second layer controls power supply to the left heating coil 4.

  An intake fan 8 is disposed on the right rear side of the main body 1. In the rear of the top surface 2 of the main body 1, an air inlet 9 is provided on the right side and an exhaust port 10 is provided on the left side in a horizontally long arrangement. The intake port 9 communicates with the intake fan 8. The air at a temperature close to room temperature sucked from the intake fan 8 through the intake port 9 cools the first-layer control circuit 7 and the second-layer control circuit 7 by the intake fan 8. At this time, the heat generated from the power semiconductor elements, choke coils, and the like of the control circuit 7 is swept away by the cooling air, so that the temperature of the cooling air becomes several tens of degrees.

  The cooling air that has cooled the first-layer control circuit 7 and the second-layer control circuit 7 strikes the front of the main body 1 and proceeds to the upper portion of the main body 1. A right heating coil 4 and a left heating coil 4 located below the top plate 3 are arranged on the upper part of the main body 1. The right heating coil 4 controlled by the first-layer control circuit 7 generates heat due to its own loss in the input power. The main factor of the loss is the electric resistance of the right heating coil 4.

  The cooling air reaching the upper part of the main body 1 cools the right heating coil 4. Further, the heat generation of the left heating coil 4 whose power supply is controlled by the control circuit 7 of the second layer is cooled, and the temperature of the cooling air rises several tens of degrees. The cooling air that has reached a high temperature is discharged into the room from the exhaust port 10 at the left rear of the main body 1.

  When cooking on the grill 5, grilling fish or the like is performed by upper and lower sheathed heaters (not shown) provided in the grill 5 warehouse. The exhaust of the grill 5 is communicated with the inside of the grill 5 through the exhaust port 10, and hot air in the grill 5 is also discharged from the exhaust port 10 together with smoke.

  The exhaust port 10 communicates with the inside of the grill 5 and communicates with the inside of the main body 1.

  A radiant heater 11 is disposed below the top plate 3 behind the main body 1. The radiant heater 11 is disposed horizontally in the same manner as the right heating coil 4 and the left heating coil 4. The pan 12 is placed on the top plate 3 and the pan 12 is heated through the top plate 3 by Joule heat generated by the radiant heater 11.

  The configuration of the right heating coil 4 and the left heating coil 4 is that a coil 14 wound in a spiral shape is placed on a substantially flat coil base 13 formed of a heat-resistant resin such as PPS, and a bar-like shape is provided below the coil 14. These ferrites 15 are arranged radially in the horizontal direction from the center and fixed to the coil base 13. One of both ends of the coil 14 is a spiral outer peripheral end, and the terminal 16 is electrically connected as it is by caulking or welding. The other end is in a spiral central portion, is directly extended below the spiral coil 14, and is drawn to the outer periphery through the lower side of the coil base 13. A terminal 16 is also electrically connected to the other end.

  As shown in FIG. 2, the coil 14 is configured to be wound in the horizontal direction with the longitudinal direction of the substantially flat strip-shaped cross section being up and down. As described above, the terminals 16 are electrically connected to the start and end of winding. As shown in FIG. 1A, the outer periphery of the coil 14 is electrically connected to the outer periphery of a hollow pipe-like fusion material 17 that melts at 200 ° C. by an insulating film 18 that constitutes an insulator obtained by baking a heat-resistant resin material. A conductor 20 constituting a strip-shaped copper wire having a configuration in which a bundle 19 of insulated copper wires having a diameter of about 50 μm is knitted into a sleeve shape is formed. Next, as shown in FIG. 1B, the conductor 20 is pressed and flattened by a roller or the like, and at the same time, the fusion material 17 is melted by the heat of the roller heated to about 300 ° C. to flatten the conductor 20. In this state, the fusion material 17 is solidified in that state, and the flat shape of the conductor 20 is maintained.

  When the fusing material 17 is once melted and solidified, the bundles 19 of the copper wires are bonded to the fusing material 17 by solidification, so that the strip-shaped coil 14 maintains an orderly processed shape without being scattered. .

  The bundle of copper wires 19 is a bundle of about 50 copper wires having a diameter of about 50 μm electrically insulated by an insulating film 18 formed of enamel or the like, and further electrically insulated by a fluororesin sleeve 21. Has been.

  When current flows through the coil 14 and the pan 12 on the top plate 3 is heated, the current tends to flow through each copper wire substantially evenly. On the other hand, the current flowing through each copper wire during induction heating tends to concentrate on the side closer to the top plate 3 of the coil due to the magnetic force of the skin effect and the eddy current flowing in the pan 12. Because of this phenomenon, the heat generated in the upper part of the coil 14 is large and the side closer to the pan 12 so far, the temperature rise on the coil upper surface side due to the radiation from the pan 12 is several tens of degrees higher. With the configuration in which the bundle 19 is knitted, one copper wire is alternately wound on the upper side and the lower side of the coil. Since the material is knitted or twisted so as to move downward, the heat conduction property of the copper material is also helped to suppress the temperature rise on the upper side of the coil 14.

  Further, since the coil 14 winds the flat conductor 20 in a spiral shape, the conductor 20 and the conductor 20 are in close contact with each other, leakage magnetic flux is reduced, and radio wave interference due to leakage of electromagnetic waves is reduced. Furthermore, since there is little leakage magnetic flux, the coupling coefficient of the pan 12 and the coil 14 also becomes large, and heating efficiency is improved.

  Moreover, the flat shape of the welding material 17 can be adjusted by adjusting the space | interval of the roller which processes the welding material 17 flatly. Thereby, the dimension (thickness) in the minor axis direction of the conductor 20 forming the coil 14 can be changed even with the same number of turns, so that the diameter of the coil 14 can be freely adjusted. The power supplied to the heating coil 4 tends to increase from 2 kW to 3 kW in recent years. In addition, there is a business that consumes a large amount of power of 5 kW to 10 kW. However, since the diameter of the coil 14 is determined by the cross-sectional area of the enameled wire and the constant of the control circuit 7, if the coil 14 has a small diameter, the center of the pan 12 is heated intensively, which adversely affects cooking. give. By adjusting the flattening of the coil 14 even with the same number of turns, the diameter of the heating coil 4 that has been simply completed can be adjusted.

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

  First, when the right heating coil 4 is energized when the pan 12 is heated, a current flows through the entire coil 14. This current is formed by the coil 14 braiding a bundle 19 of copper wires, so that the current concentrates on the side close to the pan 12 on the upper side of the coil 14, but immediately near the concentrated point immediately below the coil 14. Since it is moving, it is located on the far side from the pan 12. In addition, the heat generated in the upper part of the coil 14 is immediately diffused to a relatively low temperature part under the coil 14 due to the good heat conduction of copper. The coil base 13 is fixed to the lower side of the coil 14, and the cooling air that has cooled the first-layer control circuit 7 and the second-layer control circuit 7 on the right side of the main body 1 is heated to the right heating coil 4 and the left heating. Since it passes through the lower side of the coil 4, the heat that has moved to the lower side of the coil 14 is cooled by this cooling air, so that the entire coil 14 can be efficiently cooled, and the local area on the upper side of the coil 14 can be cooled. Temperature rise is suppressed. Therefore, it is possible to provide a safe and inexpensive coil 14 that can be used at a temperature that is sufficiently below the allowable temperature limit without using an enameled wire with an insulating film having a high heat resistance.

  Moreover, since the diameter of the coil 14 can be easily adjusted with only the adjustment of the roller for flattening the conductor while the coil 14 is in close contact, the constant with the control circuit 7 is matched and the heating efficiency is good. And the induction heating apparatus using the coil 14 which adjusted the heating area to the optimal diameter can be provided.

  Further, by adopting a configuration in which the flattened coil 14 is wound up in a spiral shape, the potential difference between adjacent conductors 20 when viewed from any conductor 20 position is a potential difference corresponding to one turn. That is, in the case of the 40-winding coil 14, a potential difference of 1/40 of the voltage applied to the coil 14 is generated in the adjacent conductor 20. On the other hand, in the case of multi-layer winding, the potential difference between adjacent conductors is not necessarily a potential difference for one turn, and in the case of two to three layers, a potential difference corresponding to five to six turns is generated. Therefore, the multi-winding conductor 20 needs to have a withstand voltage 5 to 6 times that of the first embodiment, and it is necessary to increase the thickness of the insulating material or lengthen the insulating distance. By adopting the configuration of the first embodiment which is further wound up, there is an effect that the material used can be reduced or the coil 14 can be made compact.

  Furthermore, particularly in the case of an induction heating device that supplies power to the coil 14 at a frequency of 50 kHz to 90 kHz in order to heat a nonmagnetic metal, it is necessary to increase the number of turns of the conductor 20 in order to generate more magnetic flux. In some cases, the conductor 20 is wound in multiple layers. However, in this configuration where the conductors are wound up in multiple layers, the ratio of the magnetic flux generated from the lower conductor 20 to the pan 12 is particularly small, and the coupling coefficient of the entire coil 14 with the pan 12 is small. However, there is a problem that radio interference due to the leaked electromagnetic wave occurs with a decrease in efficiency, but the effect of improving heating efficiency and improving electromagnetic wave leakage can be achieved by evenly forming the spiral coil 14 in one layer. Is effective.

(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 5 is a cross-sectional view of the heating coil of the induction heating apparatus in the second embodiment of the present invention.

  In FIG. 5, (a) is a figure of the state which twisted together the conductor to the sealing material. (B) is sectional drawing of the conductor after processing (a) into a flat shape with a heating roller. The fusing material 17 is the same as in the first embodiment. Each bundle 19 of copper wires is the same as that of the first embodiment, but is twisted to the fusion material 17. Reference numerals and names other than those described above are the same as those in the first embodiment, and will be omitted.

  The conductor 22 is formed by twisting a bundle of copper wires 19 around the fusion material 17 and winding the conductor 22 in a spiral shape to form a coil 23. Twisting is faster than knitting. A conductor 22 formed of a bundle 19 of copper wires twisted on the fusion material 17 is processed into a flat shape with a roller heated to about 300 ° C. At this time, the fusing material 17 is melted by heat and solidifies immediately, but when solidified, a bundle 19 of copper wires is bonded to the fusing material 17 to form a flat conductor 22.

  When processing the conductor 22 having a flat cross section, the coil 23 is formed when the longitudinal direction of the cross section is turned up and down and wound in a spiral shape in the horizontal direction. When set on the main body 1, the copper wire in the coil 23 is located on the upper side of the coil 23 and the nearest part thereof is moved on the lower side of the coil 23 and moved on the lower side of the coil 23.

  The operation and action of the induction heating apparatus configured as described above will be described below.

  First, when electric power is supplied to the coil 23, an eddy current is generated in the pan 12 placed on the top plate 3 to heat the bottom of the pan 12. The heating operation and the situation where heat is concentrated on the upper part of the coil 23 are the same as in the first embodiment. The heat generated at the upper part of the coil 23 is conducted to the lower part of the coil 23 because the copper wire bundle 19 is twisted and the nearest part of the copper wire located above the coil 23 is moved to the lower side of the coil 23 by twisting. This is because the heat further conducts through the copper wire, moves to the lower side of the coil 23, and is cooled by the cooling air. Except for the difference between the braiding process and the twisting process of the bundle 19 of copper wires, the operation and action are the same as those in the first embodiment.

  Further, the diameter of the coil 23 can be adjusted only by adjusting the roller that flattens the conductor 22. That is, in the spiral processing of the coil 23, the coil 23 is processed into a spiral state in which the coil 23 to be wound next is closely attached, but the short diameter, that is, the thickness dimension of the conductor 22 is adjusted by adjusting the gap between the rollers with the same number of windings. It is possible to provide an induction heating apparatus using a coil that can arbitrarily set the diameter of the coil 23 by being arbitrarily set, and has a heating efficiency and a heating area that can be adjusted to an optimum diameter. it can.

(Embodiment 3)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is a perspective view of a heating coil of the induction heating apparatus according to the third embodiment of the present invention. FIG. 7 is a heating coil cooling system diagram of the induction heating apparatus according to the third embodiment of the present invention. FIG. 8 is a perspective view of the main body of the induction heating apparatus in the third embodiment of the present invention.

  In FIG. 6, the coil 24 is formed by spirally winding a horizontal plane with the longitudinal direction of the cross section of the conductor 25 constituting the strip-shaped copper wire having a flat cross section. At the beginning of winding of the coil 24, the copper wire of the conductor 25 is loosened and separated from the fusion material 26, and then the terminal 27 is electrically connected by caulking or welding. The tip has a flat cylindrical shape only of the fusion material 26 constituting the cooling pipe. The fusion material 26 has a flat cross-sectional shape but has a hollow pipe shape. At the end of winding of the coil 23, the terminal 27 is electrically connected by caulking or welding after the copper wire is loosened and separated in the same manner as the start of winding.

  The tip has a flat cylindrical shape with only the fusion material 26. Depending on the processing method, the shape of the tip of the fusion material 26 may be left cylindrical.

  In FIG. 7, the refrigerant transport pump 28 is built in the main body 1, one end is hermetically connected to the hollow pipe-shaped fusion material 26 of the coil 24, and the other end is a heat exchanger 30 provided with heat radiation fins 29. It is connected to the. One end of the heat exchanger 30 communicates with the refrigerant transport pump 28 and the other end communicates with the pipe-shaped fusion material 26 at the winding start portion of the coil 24. Thus, a cooling system is formed in which the refrigerant transport pump 28, the heat exchanger 30, and the fusion material 26 are closed circuits, and the closed circuit of the cooling system is hermetically configured. The heat exchanger 30 is fixed to the exhaust port 10 located on the left rear portion of the top surface 2, and the heat radiation fin 29 faces the exhaust port 10.

  Reference numerals and names other than those described above are the same as those in the first embodiment, and will be omitted.

  The operation and action of the induction heating apparatus configured as described above will be described below.

  First, when electric power is supplied to the coil 24, an eddy current is generated in the pan 12 placed on the top plate 3, and the pan 12 is heated for cooking. At this time, since a current flows through the coil 24, the coil 24 temperature rises due to self-heating of the coil 24. The outer surface of the coil 24 is cooled by cooling air sent from the cooling fan 29. Further, when the power consumption of the coil 24 is 1 kW or more, the refrigerant transport pump 28 is operated by the control circuit 7 in the first layer. The wind sent from the refrigerant transport pump 28 is blown from the flat fusion material 26 at the end of winding of the coil 24, passes through the coil 24, and is discharged from the flat fusion material 26 at the start of winding. Since the wind takes away the heat of the coil 24 when passing through the flat cylindrical fusion material 26 of the coil 24, the wind coming out of the coil 24 stores heat. This heat then passes through a heat exchanger 30 arranged at the left rear part of the main body 1. At this time, since the intake fan 8 is operating, the wind that has cooled the inside of the main body 1 is discharged from the exhaust port 10, and this wind takes heat from the heat exchanger 30 located at the exhaust port 10. .

  Although the refrigerant is air, the cooling system is airtight and watertight, and therefore a refrigerant made of liquid and having a high heat transport capability may be used.

  In addition, although the heat exchanger 30 is used, when the refrigerant is air, the air that has passed through the coil 24 may be discharged into the room from the exhaust port 10 as it is. In this case, the suction port of the refrigerant transport pump 28 is preferably opened to the same suction port 9 as that of the suction fan 8.

(Embodiment 4)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 9 is a cross-sectional view of the heating coil of the induction heating apparatus in the fourth embodiment of the present invention.

  9A is a diagram showing a state in which a bundle 33 of copper wires is twisted or knitted on the outer periphery of the resin pipe 31 coated with a fusion material 32, and a conductor 34 is formed. A juicy pipe 31 and a fusion material 32 constitute a cooling pipe. (B) is sectional drawing of the conductor 34 after processing (a) into a flat shape with a heating roller. The fusion material 32 applied to the outer periphery of the resin pipe 31 is melted by the heat of the heating roller, and after the roller processing, the bundle 33 of the copper wire is bonded to the resin pipe 31 and solidified.

  The fusion material 32 is positioned and bonded between the resin pipe 31 and the bundle 33 of copper wires. The fusing material 32 is the same material as in the first embodiment. Each bundle 33 of copper wires is the same as that in the first embodiment. The conductor 34 constituting the strip-shaped copper wire is in a state of being twisted or knitted on the fusion material.

  Reference numerals and names other than those described above are the same as those in the first embodiment, and will be omitted.

  The operation and action of the induction heating apparatus configured as described above will be described below.

  By forming the resin pipe 31 inside the fusion material 32, in the third embodiment, the role of the pipe through which the refrigerant passes is given to the fusion material processed into a flat shape, but reliability and durability are increased. For this purpose, the resin pipe 31 is formed below the fusion material 32.

  The shape of the coil 35 and the shape and function of the cooling system are the same as those in the third embodiment, and will be omitted.

  Although the refrigerant is air, the cooling system is airtight and watertight, and therefore a refrigerant made of liquid and having a high heat transport capability may be used.

  Further, although the heat exchanger 30 is used, when the refrigerant is air, the air that has passed through the coil 35 may be discharged into the room from the exhaust port 10 as it is. In this case, the suction port of the refrigerant transport pump 28 is preferably opened to the same suction port 9 as that of the suction fan 8.

  Further, the power supplied to the heating coil is generally used in the range of about 20 kHz (kilohertz) to 90 kHz. In particular, the heating efficiency is drastically improved by using it in a relatively high frequency range of about 50 kHz to 90 kHz. This is because in a coil formed of a general stranded wire, the leakage magnetic flux increases abruptly as the frequency increases, and the effect of the present invention is effective when used in a relatively high frequency band of about 50 kHz to 90 kHz. is there.

  As described above, the induction heating device according to the present invention has a configuration in which a substantially flat coil is formed in a spiral shape, and a plurality of conductors are knitted or twisted together to achieve a heating efficiency with less leakage magnetic flux. In addition to providing a good coil, any heating coil diameter can be realized by adjusting the flat shape, and the design is simple and the coil size can be arbitrarily designed. It can also be applied to other devices.

Sectional drawing of the heating coil of the induction heating apparatus in Embodiment 1 of this invention The perspective view of the heating coil of the induction heating apparatus in Embodiment 1 of this invention Cross-sectional view of the main body of the induction heating device in Embodiment 1 of the present invention The exploded perspective view of the induction heating apparatus in Embodiment 1 of this invention Sectional drawing of the heating coil of the induction heating apparatus in Embodiment 2 of this invention The perspective view of the heating coil of the induction heating apparatus in Embodiment 3 of this invention Heating coil cooling system diagram of induction heating device in Embodiment 3 of the present invention Main body perspective view of induction heating apparatus in Embodiment 3 of the present invention Sectional drawing of the heating coil of the induction heating apparatus in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Top surface 3 Top plate 4 Heating coil 17 Fusing material 18 Insulation film (insulator)
19 Bundle of copper wires 21 Sleeve 22 Conductor (band copper wire)
25 Conductor (band copper wire)
26 Fusion material (cooling pipe)
28 Refrigerant transport pump 30 Heat exchanger 31 Resin pipe (cooling pipe)
32 Fusion material (cooling pipe)
33 Bundle of copper wires 34 Conductor (band copper wire)

Claims (8)

In an induction heating device that incorporates a substantially flat heating coil inside the body and heats an object to be heated via a top plate provided on the top surface of the main body, the cross-sectional shape of the heating coil is approximately long by bundling a plurality of copper wires. An induction heating apparatus having a configuration in which a strip-shaped copper wire having a flat cross section is wound in a short diameter direction. The heating coil is formed by flattening a copper wire coated with an insulator on the outer periphery into a cylindrical shape, or twisting a copper wire coated with an insulator on the outer periphery into a cylindrical shape and processing it into a flat shape The induction heating apparatus according to claim 1. The heating coil is a fusion material formed in a cylindrical shape by knitting a copper wire whose outer periphery is coated with an insulator on a cylindrical member having a fusion material or a fusion material formed along the outer periphery. Alternatively, the induction heating apparatus according to claim 2, wherein the cylindrical member having the fusion material is processed by twisting a copper wire whose outer periphery is coated with an insulator along the outer periphery. The heating coil is formed by knitting or twisting an enameled wire formed by coating the outer periphery of a copper wire with an insulator and covering the outer periphery of the insulator with a self-bonding material or covering part of the entire periphery. The induction heating device according to claim 2, wherein the induction heating device is configured to be raised and processed. The heating coil is a fusion material formed in a cylindrical shape by knitting a copper wire whose outer periphery is coated with an insulator on a cylindrical member having a fusion material or a fusion material formed along the outer periphery. Alternatively, a cylindrical member having a fusion material is processed by twisting a copper wire whose outer periphery is coated with an insulator along the outer periphery, and the fusion material is processed into a flat cross-sectional shape in a hollow state, and both ends are processed. The induction heating apparatus according to claim 2, wherein an open hollow cooling pipe is formed. The induction heating apparatus according to claim 5, further comprising a refrigerant transport pump for allowing the refrigerant to pass through the hollow cooling pipe. The induction heating apparatus according to claim 6, wherein the refrigerant is formed of air. The induction heating apparatus according to claim 6, further comprising: a refrigerant transport pump for allowing the refrigerant to pass through the cooling pipe; and a heat exchange device that forms a closed circuit with the refrigerant transport pump and the cooling pipe.

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