JP2009164012A - Induction heating coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating coil that is compact with high performance, having required quantity of magnetic flux and current resistance. <P>SOLUTION: A strip-shaped conductor 2 is formed by applying metal vapor deposition to a strip-shaped insulator 1. A thickness of the strip-shaped insulator 1 is set to approximately several μm, and a thickness of the strip-shaped conductor 2 is set to approximately from several thousands to several hundreds of Å. A winding body is formed by winding the vapor deposited strip so as to obtain required number of layers. Thereafter, in both side portions of the winding body, metallikon electrode portions 4 and 4 are formed, and, at the same time, in a center portion of the metallikon electrode portion 4 and 4, the winding body is cut. A coil base B of a U shape is formed by connecting a pair of extraction electrodes 5 and 5 to the metallikon electrode portions 4 and 4, and the induction heating coil is formed by further winding the coil base B in a swirl. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an induction heating coil used in an induction heating device.

An induction heating coil used in an induction heating cooker or the like is configured by winding a litz wire formed by twisting a plurality of thin copper wires whose surfaces are insulated in a spiral shape on a heating coil base. A magnetic field is generated by supplying a high frequency current from the inverter to the induction heating coil. An eddy current is induced in a metal pan or the like placed on the induction coil, and induction heating of the metal pan is performed by Joule heat of the eddy current flowing at that time (see Patent Document 1).
JP-A 61-240586

  By the way, in order to heat a metal body or a nonmagnetic metal body having a low resistivity by the induction heating coil, the frequency of the current flowing through the induction heating coil, the number of turns of the induction heating coil, and the current supplied to the induction heating coil are increased. Although it is necessary, since the loss is large in the conventional induction heating coil, there is a limit to the further increase. To increase these, it is necessary to reduce the coil loss.

  In order to reduce the coil loss, the copper fine wire is made thinner than before, and a larger number of wires are twisted and bundled to increase the cross-sectional area, reducing the skin effect and reducing the current from the interaction between the copper fine wires. It is necessary to suppress the proximity effect that is biased. Further, since the coil generates heat, it is necessary to eliminate heat accumulation generated in the air layer between the thin copper wires. Furthermore, the insulator covering the copper fine wire needs to be of an insulating type that can withstand high temperatures. Thus, if an induction heating coil with a large amount of magnetic flux and a high magnetic flux density is to be obtained, thinning of the wire, thinning of the insulating material, ensuring of strength and insulation, heat resistance, skin effect / proximity effect An induction heating coil that can be simultaneously reduced is required, but such an induction heating coil is very difficult to process and is extremely expensive.

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a small and high-performance induction heating coil having a necessary magnetic flux amount and a current withstand capability.

  Therefore, the induction heating coil according to claim 1 is characterized in that a plurality of layers of the strip insulators 1 and the strip conductors 2 are alternately stacked to form a stack 3 and the stack 3 is wound. .

  In addition, the induction heating coil according to claim 2 is configured by stacking a plurality of layers of the band-shaped insulators 1 and the band-shaped conductors 2 alternately to form a stacked body 3, and stacking the plurality of stacked bodies 3, or at intervals. A pair of extraction electrodes 5 and 5 are provided on each of the plurality of stacked bodies 3.

  Further, the induction heating coil according to claim 3 is characterized in that a unit coil 16 is formed by winding a strip-shaped insulator 11 and a strip-shaped conductor 12, and a plurality of unit coils 16 are mounted on a substrate 17.

  In the induction heating coil according to any one of claims 1 to 3, the strip conductors 2 and 12 are divided into a plurality of strip conductors 1 and 12 extending in the longitudinal direction. .

  In the induction heating coil according to claim 5, the sheet-like insulator 21 and the sheet-like conductor 22 are overlapped and wound, and further, the wound body is wound to form electrode portions 24 and 24 at both ends thereof. It is characterized by that.

  The induction heating coil according to claim 6 forms the unit coil 26 by overlapping and winding the sheet-like insulator 21 and the sheet-like conductor 22, and overlaps the plurality of unit coils 26 or at intervals. A pair of electrode portions 24, 24 are provided on each of the plurality of unit coils 26.

  According to the induction heating coil of the first to sixth aspects, a structure in which a plurality of metal conductors are laminated via a strip-shaped insulator and wound, instead of twisting and bundling a plurality of copper thin wires. Therefore, the metal conductor can be made thin, and as a result, the skin effect and the proximity effect can be reduced. In addition, it is possible to increase the width, the number of layers, and the stacking length (winding length) of the strip-shaped conductor and strip-shaped insulator as necessary. As a result, the induction heating coil having the necessary magnetic flux amount and current withstand capability Can be easily provided. Moreover, since generation | occurrence | production of an air layer can be suppressed in the vicinity of a strip | belt-shaped conductor, the temperature rise resulting from the confinement of the heat | fever in an air layer can be prevented.

  Furthermore, according to the induction heating coil of claims 2 to 4, the heating part of the coil can be divided and controlled, and the heating efficiency can be improved and the heating can be made uniform. A high-performance induction heating coil can be realized.

  Next, specific embodiments of the induction heating coil of the present invention will be described in detail with reference to the drawings. First, a first embodiment will be described with reference to FIGS. As shown in FIG. 1, metal deposition is performed on the strip-shaped insulator 1 to form the strip-shaped conductor 2. In this case, the thickness of the strip-shaped insulator 1 is preferably about several μm, and the thickness of the strip-shaped conductor 2 is preferably about several thousand to several hundreds of mm. And the vapor deposition belt | band | zone formed in this way is wound around the core of a predetermined diameter so that a required number of layers may be obtained, this is removed from a core, and a wound body is formed. Next, as shown in FIG. 2, metal spraying is performed on a part of the circumferential direction on both side surface portions of the wound body to constitute the metallicon electrode portions 4, 4. Cut the wound body. As a result of cutting the wound body in this way, a laminated body 3 is formed between the cut ends. Then, a U-shaped coil base B as shown in FIG. 2 is formed by connecting a pair of extraction electrodes 5 and 5 to the metallicon electrode portions 4 and 4 located at the cut end of the laminate 3 by brazing. To do. In this case, the pair of extraction electrodes 5 and 5 are attached so as to be positioned on the side portions on the opposite side of the laminate 3. After that, as shown in FIG. 3, a U-shaped (partially cut ring-shaped) coil base B is further wound into a spiral shape, whereby a plurality of winding induction heating coils having a plurality of layers of strip-shaped conductors 2 are formed. Can be formed.

  According to the induction heating coil, a magnetic flux is generated by flowing a high-frequency current through the strip-shaped conductor 2, and a metal pan or the like disposed on the induction heating coil can be heated. In this case, the thickness of the strip-shaped conductor 2 can be reduced to several hundreds to thousands of ridges. In addition to reducing the skin effect, the strip-shaped insulator 1 having a thickness of several μm can be used to reduce the size. . Further, since the induction heating coil can be easily formed, it can be provided at a low cost. Furthermore, by changing the number of windings of the strip-shaped conductor 2, the width of the vapor deposition body, and the number of spirals of the U-shaped coil base B, an induction heating coil can be easily formed according to the required magnetic flux amount and current withstand capability. Therefore, a small, inexpensive, and high performance induction heating coil can be realized.

  FIG. 4 shows a modification of the first embodiment. This is because the first winding body is formed by winding the vapor-deposited body on the winding core having a predetermined diameter similar to that of the above-described embodiment so that the required number of layers can be obtained, and the insulating material 7a is formed thereon a predetermined number of times. In addition, the insulating material 7b and the third winding body are further formed thereon, such that the second winding body is formed by winding the vapor deposition body so that the required number of layers is obtained. The insulating material 7c and the fourth wound body are formed in this order. Then, metal spraying is performed on a part of the circumferential direction on both side surface portions of each wound body to constitute the metallicon electrode portions 4 and 4, and by cutting each wound body at the center portion of the metallicon electrode portions 4 and 4. A plurality of laminated bodies 3 are formed. And an induction heating coil is formed by connecting a pair of extraction electrodes 5 and 5 by brazing to the metallicon electrode portions 4 and 4 located in the vicinity of the cut end portion of each laminate 3. In the induction heating coil having such a structure, a plurality of types of U-shaped coil bases B as shown in FIG. 2 are prepared for each diameter, and an insulating material 7 is provided outside the coil base B having a small diameter. It can also be formed by sequentially repeating the work of externally fitting the large coil base B. In this induction heating coil, in addition to obtaining the same effects as those of the above embodiment, each coil base B can be operated independently. As a result of the division control of each coil base B as described above, it is possible to improve the heating efficiency, make the heating uniform, etc., and realize a further compact, inexpensive and high-performance induction heating coil.

  5 to 7 show a second embodiment of the induction heating coil. As shown in FIG. 5, a plurality of strip conductors 12 (five in the example shown in the figure) are arranged in parallel on the strip insulator 11, and lead electrodes 15 and 15 are provided at both ends of the strip conductor 12, respectively. Connect with brazing. In this case, the five strip electrode bodies 12 are commonly connected by the extraction electrodes 15 and 15 at both ends of the strip conductor 12. The thickness of the strip insulator 11 is preferably about several μm, and the strip conductor 12 is preferably a copper or aluminum metal foil, and the thickness is preferably about several μm. Then, the vapor deposition zone 13 formed in this manner is wound around a core having a predetermined diameter so that a required number of layers can be obtained, and is removed from the core to obtain an empty space as shown in FIG. A core unit coil 16 is formed. Then, as shown in FIG. 7, a plurality of unit coils 16 are concentrically arranged in an inner and outer double with respect to a pair of upper and lower disk-like substrates 17 and 17 arranged one above the other. And the induction heating coil is comprised by electrically connecting each extraction electrode 15 and 15 of each unit coil 16 to each board | substrate 17 and 17. FIG.

  Then, a high frequency current is supplied to each unit coil 16 from the electrode lead-out portions 18 and 18 of each substrate 17 and 17, and a current is caused to flow through each unit coil 16 as indicated by a broken line in FIG. A magnetic flux as indicated by a solid line is generated, and a metal pan or the like disposed on the upper side of the induction heating coil can be heated. In this case, the skin effect can be reduced by setting the thickness of the strip conductor 12 to several μm, and in addition, the size can be reduced by using the strip insulator 11 of several μm. Further, since the induction heating coil can be easily formed, it can be provided at a low cost. Furthermore, the number of the strip-like conductors 12 in the unit coil 16 and the winding length are increased or decreased, or the combination of series and parallel when connecting to the substrate 17 is changed to match the required magnetic flux amount and current withstand capability. An induction heating coil can be easily formed. In addition, it is possible to energize each of the unit coils 16 and perform various coil controls. As a result, a small, inexpensive and high-performance induction heating coil can be realized. In this embodiment, an example is shown in which the strip-shaped conductor 12 is made of a metal foil. However, the strip-shaped conductor 12 can also be formed by metal deposition as in the first embodiment.

  8 and 9 show a third embodiment of the induction heating coil. This is because a sheet-like insulator 21 made of a film having a thickness of several μm and a sheet-like conductor 22 made of a metal foil having a thickness of several μm are overlapped and wound into a flat shape, and metallicon electrode portions 24 are formed at both ends thereof. Is formed by thermal spraying to constitute the coil base C. In this case, instead of the metal foil, the sheet-like conductor 22 may be formed on the sheet-like insulator 21 by vapor-depositing a metal with a thickness of several hundred to several thousand Å. And as shown in FIG. 9, an induction heating coil is formed by winding up such a coil base C in a spiral shape. Magnetic flux is generated by passing a high-frequency current through the induction heating coil, and a metal pan or the like disposed on the induction heating coil can be heated. In this case, the skin effect can be reduced by setting the thickness of the metal foil conductor 22 to several μm, and in addition, the use of the strip-like insulator 1 of several μm enables downsizing. Furthermore, it can replace with the metal foil conductor 22, and can be comprised still more compactly by performing metal vapor deposition of several hundreds-thousands of liters. In addition, other functions and effects apparent from the description of the first and second embodiments can also be achieved.

  FIG. 10 shows a modification of the above embodiment. In this configuration, a plurality of U-shaped (partially cut ring-shaped) coil bases C having different sizes are arranged concentrically so that the plurality of unit coils 26 can be divided and controlled. As a result, it is possible to energize each of the unit coils 26 and to perform various coil controls.

  Although the specific embodiment of the induction heating coil of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. It is.

It is a perspective view which shows the vapor deposition zone used in 1st Embodiment of the induction heating coil of this invention. It is a perspective view which shows the U-shaped coil base used in the said embodiment. It is a perspective view which shows the induction heating coil of the said embodiment. It is a perspective view which shows the example of a change of the said induction heating coil. It is a perspective view which shows the strip | belt-shaped insulator used in 2nd Embodiment of this invention, a strip | belt-shaped conductor, and an extraction electrode. It is a perspective view which shows the unit coil used in the induction heating coil of the said embodiment. It is a perspective view which shows the induction heating coil of the said 2nd Embodiment. It is a perspective view which shows the unit coil used in 3rd Embodiment of an induction heating coil. It is a perspective view which shows the induction heating coil of the said 3rd Embodiment. It is a perspective view which shows the example of a change of the said induction heating coil.

Explanation of symbols

1, 11 .. Strip insulator, 2, 12.. Strip conductor, 3 .. Laminated body, 4 .. Metallicon electrode part, 5, 15 .. Extraction electrode, 16, 26 .. Unit coil, 17. Substrate, 21 .. Sheet-like insulator, 22 .... Sheet-like conductor, 24 .. Metallicon electrode part

Claims (6)

  An induction heating coil characterized in that a laminated body (3) is formed by alternately laminating a plurality of layers of a strip-shaped insulator (1) and a strip-shaped conductor (2), and the laminated body (3) is wound. .   A plurality of laminates are formed by alternately laminating a plurality of layers of the strip insulator (1) and the strip conductor (2), and winding the plurality of laminates (3) around the same axis. An induction heating coil comprising a pair of extraction electrodes (5) and (5) in each of (3).   An induction heating coil, wherein a unit coil (16) is formed by winding a band-shaped insulator (11) and a band-shaped conductor (12), and a plurality of unit coils (16) are mounted on a substrate (17).   The band-shaped conductor (2) (12) is divided and configured to be a plurality of band-shaped conductors (1) (12) extending in the longitudinal direction. Induction heating coil.   The sheet-like insulator (21) and the sheet-like conductor (22) are overlapped and wound, and the wound body is wound to form the electrode portions (24) and (24) at both ends. A feature of the induction heating coil.   A unit coil (26) is formed by overlapping and winding the sheet-like insulator (21) and the sheet-like conductor (22), and a plurality of unit coils (26) are wound around the same axis, An induction heating coil, wherein a pair of electrode portions (24) and (24) is provided in each of the unit coils (26).