JP4808797B2 - High frequency induction heating device - Google Patents

Description

  The present invention relates to a high-frequency induction heating apparatus, and more particularly, to a high-frequency induction heating apparatus suitable for use in heating a thin wire such as a copper wire, a stainless steel wire, or an iron wire.

  Conventionally, when heating a heating object having magnetism such as a magnetic metal, for example, a heating method is known in which heating is performed by induction heating using a high frequency.

  However, in such heating by induction heating, it is difficult to heat a nonmagnetic and low resistivity metal such as copper or aluminum. To heat the metal, the frequency of the current flowing through the heating coil is increased, The number of turns had to be increased and a dedicated device had to be prepared.

  In addition, in the heating by induction heating, since the eddy currents cancel each other due to the influence of the penetration depth of the eddy current generated on the surface of the heating object due to the oscillation frequency, the heating object is made of a magnetic material. Even in the case of a shape such as a thin wire rod or thin plate, heating may not be possible.

As a high-frequency induction heating means for solving such a problem, for example, a high-frequency induction heating device having the configuration shown in FIG. 1 is known.

  That is, FIG. 1 shows an example of a conventional high-frequency induction heating device, but this high-frequency induction heating device 10 is arranged at a predetermined interval from each other and rotates around an axis. The energizing rolls 16L and 16R for conveying the heated object 12 placed in contact with the upper surface by means of, the copper plate 14 connected by the energizing roll 16R and the wiring 13b and connected by the energizing roll 16L and the wiring 13b, and the energizing roll A heating coil 18 serving as an induction heating unit provided between 16L and 16R and disposed so that the heating object 12 is conveyed in the internal space, and a high-frequency power source 22 for applying a high-frequency current to the heating coil 18 The high-frequency bus bar 20 that connects the heating coil 18 and the high-frequency power source 22 is provided.

In the above configuration, to heat the object 12 to be heated by the high frequency induction heating apparatus 10, first, when a high frequency current is applied to the heating coil 18 from the high frequency power source 22 via the high frequency bus bar 20, the arrow A is applied to the heating coil 18. High-frequency current flows in the direction.

  When a high-frequency current flows in the heating coil 18 in the direction of arrow A in this way, an axial current in the direction of arrow B is induced in the heating object 12 in the heating coil 18, and the induced axial current is transferred from the heating object 12 to the energizing roll 16R. Then, it again flows into the heating object 12 through the wiring 13a, the copper plate 14, the wiring 13b, and the energizing roll 16L.

  That is, the axial current induced in the heating object 12 in the heating coil 18 flows in a closed circuit formed by the heating object 12, the energizing roll 16R, the wiring 13a, the copper plate 14, the wiring 13b, and the energizing roll 16L. Thus, the object to be heated 12 is heated by energization heating by the axial current flowing through the closed circuit.

  That is, in the high frequency induction heating device 10, the heating object 12 can be heated by induction heating in the heating coil 18 and heating by energization heating between the energizing rolls 16L and 16R.

Therefore, according to the high frequency induction heating device 10, even if the heating object 12 is a non-magnetic or low resistivity metal or a thin wire made of a magnetic material, The heating object 12 can be heated.

However, in such a high-frequency induction heating device 10, since the axial current induced in the heating object 12 in the heating coil 18 is small, there has been a problem that the heating efficiency by energization heating is low.

Note that the prior art that the applicant of the present application knows at the time of filing a patent application is not an invention related to a known literature invention, and therefore there is no prior art document information to be described in the present specification.

FIG. 1 is a schematic diagram illustrating a conventional high-frequency induction heating apparatus. FIG. 2 is a schematic configuration explanatory view showing the high-frequency induction heating apparatus according to the first embodiment of the present invention. FIG. 3 is a schematic configuration explanatory view showing a high-frequency induction heating apparatus according to the second embodiment of the present invention. 4 (a) and 4 (b) are schematic configuration explanatory views showing a modification of the guide pipe.

  The present invention has been made in view of the various problems of the conventional techniques as described above, and an object of the present invention is to provide a high-frequency induction heating apparatus capable of performing efficient current heating. It is what.

  In order to achieve the above object, in a high frequency induction heating apparatus that heats a heating object conveyed in the induction heating unit by applying a high frequency current to the induction heating unit, the induction heating unit is disposed at a predetermined interval from each other. In addition, a pair of current-carrying rolls composed of a first current-carrying roll and a second current-carrying roll for conveying a heating object placed in contact with each other by rotating around an axis, the first current-carrying roll, and the first current-carrying roll 2 is provided between the copper plate for connecting the two energizing rolls via the wiring, the first energizing roll and the second energizing roll, and the heating object is conveyed in the internal space. An induction pipe as an induction heating unit disposed; a high-frequency power source that applies a high-frequency current to the induction pipe; and a high-frequency bus bar that connects the induction pipe and the high-frequency power source, Frequency bus bar, as well as provided in the vicinity of the copper plate, in which so as to be arranged in parallel by the copper plate and the predetermined length.

  In the present invention described above, the guide pipe has a substantially cylindrical shape.

  The present invention is the above-described invention, wherein the guide pipe has a slit portion formed on a side surface.

  In the present invention, a ferrite ring is provided on the outer periphery of the induction pipe.

  Further, the present invention provides a high-frequency induction heating apparatus that heats an object to be heated conveyed in the induction heating unit by applying a high-frequency current to the induction heating unit, and is arranged with a predetermined interval therebetween and a shaft. It consists of an energizing roll and a roll that conveys the heating object that is placed in contact by rotating around the center, and the heating object conveyed from the energizing roll is folded back by the roll and then the roll of the energizing roll again. A pair of rolls to be transported to the shaft, and a first induction pipe arranged so that the heating object transported from the energizing roll to the roll is transported in an internal space; A second induction pipe arranged so that the heating object conveyed from the roll to the roll axis of the energizing roll is conveyed in an internal space; and the first induction A high-frequency power source for applying a high-frequency current to the first induction pipe and the second induction pipe, the first induction pipe and the second induction pipe are connected, and the first induction pipe and the second induction pipe are connected. And a high-frequency bus bar connected to the high-frequency power source.

  According to the present invention, in the above-described invention, at least one of the first guide pipe and the second guide pipe has a substantially cylindrical shape.

  In the present invention described above, in the above-described invention, at least one of the first guide pipe and the second guide pipe has a slit formed on a side surface.

  In the present invention, a ferrite ring is provided on the outer periphery of at least one of the first guide pipe and the second guide pipe.

  Since the present invention is configured as described above, there is an excellent effect that it is possible to perform efficient energization heating.

  Hereinafter, an example of an embodiment of a high-frequency induction heating device according to the present invention will be described in detail with reference to the accompanying drawings.

  In the following description, the same or equivalent components as those of the conventional high-frequency induction heating apparatus described with reference to FIG. 1 will be described in detail using the same reference numerals as those used above. The description of the configuration and the function and effect will be omitted as appropriate.

First, a first embodiment of a high-frequency induction heating device according to the present invention will be described with reference to FIG.

  FIG. 2 shows a schematic configuration diagram of the high frequency induction heating device according to the first embodiment of the present invention. The high frequency induction heating device 30 shown in FIG. 2 includes wirings 13a and 13b, a copper plate 14, and the like. The induction heating unit connected to the high-frequency power source 22 by the high-frequency bus bar 20 is provided between the energizing rolls 16L and 16R that are connected by the above.

  Here, in the high frequency induction heating device 30, an induction pipe 32 is used as the induction heating unit, and a part of the high frequency bus bar 20 that connects the high frequency power supply 22 and the induction pipe 32 is arranged in parallel near the copper plate 14. In this respect, the high-frequency induction heating device 10 is different.

More specifically, the guide pipe 32 is made of a substantially cylindrical nonmagnetic metal, and for example, a copper pipe is used.

  In addition, the induction pipe 32 has a diameter that does not contact the heating object 12 such as a wire conveyed in the internal space of the induction pipe 32, and has a length that does not contact the energizing rolls 16L and 16R. Configured.

  In addition, the axial current induced | guided | derived to the heating target object 12 conveyed in the internal space of the induction pipe 32 increases so that such an induction pipe 32 is small in diameter and long.

  Therefore, the diameter, length, etc. of the best induction pipe 32 depend on the shape of the heating object 12, the installation distance between the energizing roll 16L and the energizing roll 16R, and so on. be able to. Practically, for example, the diameter can be about 20 mm and the length can be about 1000 mm.

Further, the high frequency bus bar 20 is preferably arranged in the shortest in the circuit configuration, and the portion arranged in parallel in the vicinity of the return copper plate 12 is preferably longer.

In the above configuration, to heat the object 12 to be heated by the high frequency induction heating device 30, first, when a high frequency current is applied to the induction pipe 32 from the high frequency power source 22 via the high frequency bus bar 20, an arrow C is applied to the induction pipe 32. High-frequency current flows in the direction.

  When a high-frequency current flows in the induction pipe 32 in the direction of arrow C in this way, an axial current in the direction of arrow D is induced in the heating target 12 in the induction pipe 32, and the induced axial current is supplied from the heating target 12 to the energizing roll 16R. Then, it again flows into the heating object 12 through the wiring 13a, the copper plate 14, the wiring 13b, and the energizing roll 16L.

  That is, the axial current induced in the heating object 12 in the induction pipe 32 flows in a closed circuit formed by the heating object 12, the energizing roll 16R, the wiring 13a, the copper plate 14, the wiring 13b, and the energizing roll 16L. Thus, the heating object 12 is heated by energization heating by the axial current flowing through such a closed circuit.

At this time, since the axial current induced in the heating object 12 in the induction pipe 32 flows through the copper plate 14, a part of the high-frequency bus bar 20 is provided in parallel in the vicinity of the copper plate 14. The axial current is also induced in the portion provided in parallel in the vicinity of the high-frequency bus bar 20 in the above, and flows to the heating object 12 through the above-described closed circuit.

  That is, in the heating object 12, axial current is induced in the heating object 12 in the induction pipe 32 and a portion provided in parallel with the copper plate 14 in the vicinity of the high frequency bus bar 20.

  Further, in the induction heating unit, the larger the portion formed in parallel with the heating object 12, the more axial current can be generated in the heating object 12 conveyed in the internal space of the induction heating unit. The induction pipe 32 can induce more axial current than the heating coil 18.

  That is, in the high-frequency induction heating device 30, the induction heating unit that can induce more axial current is used, and the axial current is also induced in parts other than the induction heating unit. Heating can be performed.

As described above, the high-frequency induction heating device 30 can perform heating by more efficient electric heating as compared with the high-frequency induction heating device 10 according to the related art, and by such heating by electric heating and heating by induction heating. The heating object 12 can be heated.

  Therefore, according to the high frequency induction heating device 30, even if the object 12 to be heated is a non-magnetic or low resistivity metal or a thin wire, it is more suitable than the high frequency induction heating device 10 according to the prior art. The heating object 12 can be efficiently heated by electric heating.

Next, a second embodiment of the high-frequency induction heating device according to the present invention will be described with reference to FIG.

  In the following description, the same reference numerals as those used above are used for the same or corresponding components as those of the first embodiment of the high-frequency induction heating device according to the present invention described with reference to FIG. Therefore, detailed description of the configuration and operation will be omitted as appropriate.

FIG. 3 shows a schematic configuration explanatory diagram of a high-frequency induction heating device according to a second embodiment of the present invention. The high-frequency induction heating device 40 shown in FIG. The energizing roll 42 on which the heating target 12 is placed, the energizing roll 42 being disposed at a predetermined interval, the heating object 12 is placed in contact with the upper surface, and the axis is the axis of the energizing roll 42. An induction pipe as an induction heating unit provided between the roll 44 provided in parallel with the energizing roll 42 and the roll 44 and disposed so that the heating object 12 is conveyed in the internal space. 32-1 and 32-2, the high-frequency bus bar 20-2 connecting the induction pipes 32-1 and 32-2, and the high-frequency bus bar 20- connecting the induction pipes 32-1 and 32-2 to the high-frequency power source 22, respectively. 1, It is constructed and a 0-3.

More specifically, when the energizing roll 42 and the roll 44 rotate around the axis, the heated object 12 placed in contact with the upper surface of the energizing roll 42 and the upper surface of the roll 44 is conveyed.

  That is, the heating object 12 is transported from the energizing roll 42 to the roll 44 by rotating the energizing roll 42 and the roll 44 around the axis, and is turned back by the roll 44 to be turned from the roll 44 to the axis of the energizing roll 42. It is conveyed to 42a.

  That is, the heating object 12 is conveyed on the upper side of the energizing roll 42 and the roll 44, is folded back on the roll 44, and is conveyed on the lower side of the energizing roll 42 and the roll 44. It is conveyed in two different directions between the rolls 44.

  At this time, the heating object 12 is electrically short-circuited in the energizing roll 42. For this reason, the energizing roll 42 does not require an energizing brush.

In addition, the induction pipes 32-1 and 32-2 are arranged so that the heating object 12 passes through the internal space. More specifically, the induction pipe 32-2 includes the energizing roll 42 and the roll 44. The heating object 12 conveyed on the lower side is disposed so as to pass through the inner space, and the induction pipe 32-1 is heated on the induction roll 42 and the roll 44, and the heating object 12 conveyed on the upper side passes through the inner space. To be arranged.

  The induction pipe 32-2 is arranged with one end directed toward the energizing roll 42 and the other end directed toward the roll 44, and at one end, the high-frequency power source is provided by the high-frequency bus bar 20-1. 22 is connected.

  In addition, the guide pipe 32-1 is also arranged with one end directed toward the energizing roll 42 and the other end directed toward the roll 44. At the one end, the high-frequency bus bar 20-3 is used. A high frequency power supply 22 is connected.

  The induction pipe 32-2 and the induction pipe 32-1 are connected to each other by the high-frequency bus bar 20-2 at the other end.

In the above configuration, to heat the object 12 to be heated by the high frequency induction heating device 40, first, when a high frequency current is applied to the induction pipe 32-2 from the high frequency power supply 22 via the high frequency bus bar 20-1, the induction pipe 32 is supplied. The high frequency current applied to -2 is applied to the induction pipe 32-1 via the high frequency bus bar 20-2.

  That is, a high frequency current flows in the direction of the arrow E through the induction pipe 32-2, and a high frequency current flows in the direction of the arrow F through the induction pipe 32-1.

  Thus, when a high-frequency current flows from the high-frequency power source 22 to the induction pipes 32-1 and 32-2, the arrow G is applied to the heating object 12 conveyed below the energizing roll 42 and the roll 44 in the induction pipe 32-2. An axial current in the direction is induced, and an axial current in the direction of arrow H is induced in the heating object 12 transported upward in the induction heating device 32-1.

  And the axial current of the arrow G direction induced | guided | derived in the induction | pipe pipe 32-2 is the roll axis | shaft 42a, the energizing roll 42, the energizing roll 42, and the heating object 12 conveyed below the energizing roll 42 and the roll 44, and The heated object 12 conveyed on the upper side of the roll 44 passes through the roll 44 and again flows into the heated object 12 conveyed on the lower side of the energizing roll 42 and roll 44.

  Moreover, the axial current of the arrow H induced in the induction pipe 32-1 passes from the heating object 12 conveyed on the upper side of the energizing roll 42 and the roll 44 to the lower side of the roll 44, the energizing roll 42, and the roll 44. The heated object 12, the roll shaft 42 a, and the energizing roll 42 are conveyed to flow again into the heated object 12 to be conveyed on the upper side of the energizing roll 42 and the roll 44.

  That is, the axial current induced in the heating object 12 in the induction pipe 32-2 and the axial current induced in the heating object 12 in the induction pipe 32-1 are conveyed below the energizing roll 42 and the roll 44. The heated object 12, the roll shaft 42a, the energizing roll 42, the energizing roll 42, and the roll 44 that are transported above the heated object 12 and the roll 44 that flows in a closed circuit. The object to be heated 12 is heated by energization heating due to the axial current flowing through the circuit.

At this time, in the heating object 12 conveyed between the energizing roll 42 and the roll 44, the axial current induced by the induction pipe 32-1 and the axial current induced by the induction pipe 32-2 are closed as described above. It will flow in the circuit.

  In addition, the induction pipes 32-1 and 32-2 can induce more axial current than the heating coil 18.

  That is, in the high frequency induction heating device 40, an induction heating unit that can induce more axial current is used, and the induction heating unit is provided in each conveyance direction of the heating object 12 that is conveyed in two different directions. As a result, the axial current can be induced, whereby efficient heating by energization heating can be performed.

As described above, the high-frequency induction heating device 40 can perform heating by more efficient electric heating as compared with the high-frequency induction heating device 10 according to the prior art. The heating object 12 can be heated.

  Therefore, according to the high frequency induction heating device 40, even if the heating object 12 is a non-magnetic or low resistivity metal or a thin wire, it is more efficient than the conventional high frequency induction heating device 10. In particular, the heating object 12 can be heated by electric heating.

As described above, in the high frequency induction heating device 30, the induction pipe 32 is used as the induction heating unit, and a part of the high frequency bus bar 20 is provided in parallel near the copper plate 14, thereby heating the induction pipe 32. An axial current is induced in the object 12, and an axial current is also induced in the high-frequency bus bar 20 provided in parallel in the vicinity of the copper plate 14.

  And in the high frequency induction heating apparatus 30, since the closed circuit is formed by the energizing roll 16R, the wiring 13a, the copper plate 14, the wiring 13b, and the energizing roll 16L, the axial current induced in the heating object 12 and the high frequency bus bar 20 As a result, the shaft current induced in step 1 flows in the closed circuit, and a large amount of shaft current flows in the heating object 12 conveyed between the energizing rolls 16L and 16R.

  In addition, in the high frequency induction heating device 40, the induction pipes 32-1 and 32-2 are used as the induction heating unit, and the object to be heated 12 is conveyed above the energizing roll 42 and the roll 44, and The heated object 12 that is folded and conveyed below the energizing roll 42 and the roll 44 and conveyed above the energizing roll 42 and the roll 44 passes through the internal space of the induction pipe 32-1, and the energizing roll 42 and By causing the heating object 12 conveyed below the roll 44 to pass through the internal space of the induction pipe 32-2, axial current is induced in the heating object 12 in the induction pipes 32-1 and 32-2. Will be.

  And in the high frequency induction heating apparatus 40, the heating object 12 conveyed below the energizing roll 42 and the roll 44, the heating which is conveyed above the roll shaft 42a, the energizing roll 42, the energizing roll 42, and the roll 44 are heated. Since the object 12 and the roll 44 form a closed circuit, the shaft guided by the heating object 12 conveyed in the induction pipe 32-1 and the heating object 12 conveyed in the induction pipe 32-2. Current flows in the closed circuit, and a large amount of axial current flows through the heating object 12 conveyed between the energizing roll 42 and the roll 44.

That is, in the high-frequency induction heating device 30 and the high-frequency induction heating device 40, more axial current flows than the high-frequency induction heating device 10 of the prior art, so that the heating object 12 is non-magnetic or low resistance. Even if it is a metal of a rate or a thin wire, the heating object 12 can be heated by more efficient electric heating.

The embodiment described above can be modified as shown in the following (1) to (3).

  (1) In the above-described embodiment, the substantially cylindrical induction pipes 32, 32-1, and 32-2 are provided as the induction heating unit. However, the present invention is not limited to this.

  That is, the high-frequency induction heating device 30 according to the first embodiment of the present invention and the high-frequency induction heating device 40 according to the second embodiment of the present invention have side surfaces as induction heating portions as shown in FIG. Alternatively, a substantially cylindrical guide pipe 36 provided with a slit 36a may be provided.

  When the induction pipe 36 shown in FIG. 4A is provided as the induction heating unit, when the heating object 12 is a thin wire, the heating object that is a thin wire using the slit 36a. 12 can be inserted, and the guide pipe 36 can be easily installed.

  (2) In the above-described embodiment, only the induction pipe is provided as the induction heating unit. However, the present invention is not limited to this.

  That is, in the high frequency induction heating apparatus 30 according to the first embodiment of the present invention and the high frequency induction heating apparatus 40 according to the second embodiment of the present invention, as shown in FIG. Further, a ferrite ring 38 may be provided on the outer periphery of the guide pipes 32, 32-1 and 32-2.

  As shown in FIG. 4B, by providing a ferrite ring 38 on the outer periphery of the guide pipes 32, 32-1, and 32-2, the inside of the inner space of the guide pipes 32, 32-1, and 32-2 is conveyed. More axial current induced in the heating object 12 can be induced.

  (3) You may make it combine the above-mentioned embodiment and the modification shown in above-mentioned (1) thru | or (2) suitably.

  The present invention is suitable for use as a high-frequency induction heating apparatus for heating a thin wire or the like.

10, 30, 40 High-frequency induction heating device 12 Heating object 14 Copper plate 13a, 13b Wiring 16L, 16R, 42 Current roll 18 Heating coil 20, 20-1, 20-2, 20-3 High-frequency bus bar 32, 32-1, 32-2, 36 Guide pipe 38 Ferrite ring 44 Roll

Claims (8)

In a high frequency induction heating apparatus that heats a heating object conveyed in the induction heating unit by applying a high frequency current to the induction heating unit,
A pair of current-carrying rolls, each of which is composed of a first current-carrying roll and a second current-carrying roll, arranged to be spaced apart from each other and transporting a heating object placed in contact with each other by rotating around an axis. ,
A copper plate connecting the first energizing roll and the second energizing roll via wiring;
An induction pipe as an induction heating unit provided between the first energizing roll and the second energizing roll and disposed so that the heating object is conveyed in an internal space;
A high frequency power supply for applying a high frequency current to the induction pipe;
A high-frequency bus bar connecting the induction pipe and the high-frequency power source;
The high-frequency bus bar is provided in the vicinity of the copper plate, and is disposed so as to be parallel to the copper plate by a predetermined length. In the high frequency induction heating device according to claim 1,
The induction pipe has a substantially cylindrical shape. In the high frequency induction heating apparatus according to any one of claims 1 and 2,
The induction pipe has a slit portion formed on a side surface thereof. In the high frequency induction heating apparatus according to any one of claims 1, 2, or 3,
A high frequency induction heating device, wherein a ferrite ring is provided on an outer periphery of the induction pipe. In a high frequency induction heating apparatus that heats a heating object conveyed in the induction heating unit by applying a high frequency current to the induction heating unit,
The heating object that is arranged at a predetermined interval and includes an energizing roll and a roll that conveys a heating object that is placed in contact by rotating around an axis, and the heating object that is conveyed from the energizing roll A pair of rolls that are folded back by the rolls and conveyed again to the roll shaft of the energizing roll;
A first induction pipe arranged so that the heating object conveyed from the energizing roll to the roll is conveyed in an internal space;
A second induction pipe arranged so that the heating object conveyed from the roll to the roll axis of the energizing roll is conveyed in an internal space;
A high frequency power source for applying a high frequency current to the first induction pipe and the second induction pipe;
A high-frequency bus bar for connecting the first induction pipe and the second induction pipe and connecting the first induction pipe and the second induction pipe to the high-frequency power source. Induction heating device. In the high frequency induction heating device according to claim 5,
At least one of the first induction pipe and the second induction pipe has a substantially cylindrical shape. In the high frequency induction heating apparatus according to any one of claims 5 and 6,
A slit part is formed on a side surface of at least one of the first induction pipe and the second induction pipe. In the high frequency induction heating device according to any one of claims 5, 6 and 7,
A high frequency induction heating apparatus, wherein a ferrite ring is provided on an outer periphery of at least one of the first induction pipe and the second induction pipe.

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