JP2014038815A - Induction heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an induction heating apparatus using bus-bars for wires and develop an induction heating apparatus that can prevent short-circuiting caused by dirt or dust.SOLUTION: In a bus-bar array 50, a cover member 60 is mounted at the mating portion between the long side of a U-side horizontal bus-bar 22 and the long side of a V-side horizontal bus-bar 23. The cover member 60 is an elongated member which is beforehand formed by using a raw material having insulating properties and elasticity such as rubber or the like. The cover member 60 is designed to have a space 61 therein like the cross-section thereof is C-shaped, U-shaped or Ω-shaped cross-section, and have an opening portion 62 at a part thereof. The open end 65 of the cover member 60 presses a plane portion 66 of the U-side horizontal bus-bar 22 and a plane portion 67 of the V-side horizontal bus-bar 23 and comes into close contact with both plane portions 66, 67.

Description

  The present invention relates to an induction heating apparatus for metal heat treatment such as an induction hardening apparatus.

  Induction hardening is known as one of the measures for heat-treating steel materials. Induction hardening is widely used for hardening of machine parts because it can be quenched in a short time and only the surface side can be hardened by hardening.

As shown in FIG. 10, the induction hardening apparatus (induction heating apparatus) 100 includes a power supply unit 5 including a high frequency oscillator 2 (including an AC commercial power supply), a capacitor 3, and the like, a transformer 6, an induction heating coil 8, and the like. Has been. The space between them is wired by the conductive members 10 and 11, and the high-frequency current generated by the power supply unit 5 is transformed by the transformer 6 and supplied to the induction heating coil 8.
Here, the induction hardening apparatus 100 generally needs to pass a large current through the induction heating coil 8, and the conductive members 10 and 11 connecting the devices need to have a considerable cross-sectional area.
Therefore, for example, a solid and strip-shaped copper plate called a bus bar may be used for a part of the conductive member 10 that connects the power supply unit 5 and the transformer 6.
And if it is a single phase, the bus bar for U side and the bus bar for V side are put on both sides of the insulating sheet, and in this state, the wires are wired between the devices.

FIG. 11 shows wiring around the capacitor 3.
The capacitor 3 shown in FIG. 11 is a case in which a plurality of built-in capacitors are housed in one case 15, and terminals of one polarity 20a, 20b, and 20c are linearly arranged and opposed to the other polarity. Terminals 21a, 21b, and 21c are arranged linearly.
These terminals 20 and 21 are connected to the primary side coil 6 a of the transformer 6 by the bus bar array 101.

For example, if the bus bar row 101 has an AA cross section, the U-side horizontal bus bar 22 and the V-side horizontal bus bar 23 are overlapped with the insulating sheet 102 interposed therebetween as shown in FIGS. 12, 13, and 14. Is.
Further, as shown in FIGS. 15 and 16, the portion B in FIG. 11 is obtained by overlapping a U-side stepped bus bar 30 bent in a step shape and a V-side stepped bus bar 31 with an insulating sheet 105 interposed therebetween. It is.

  The horizontal pulling portion 32 formed by the U side horizontal bus bar 22 and the V side horizontal bus bar 23 and the step portion 33 formed by the U side stepped bus bar 10 and the V side stepped bus bar 11 are fastened by bolts 35. Has been.

  Also, in the vertical posture portion such as the portion C in FIG. 11, as shown in FIG. 17, the vertical U-side bus bar 37 and the V-side bus bar 38 are overlapped with the insulating sheet 106 interposed therebetween.

JP 2011-233339 A JP 2011-58059 A

By the way, the wiring part by the bus bar of the induction hardening apparatus may be short-circuited for some reason.
Dust and dust can be considered as one of the causes of the short circuit.
That is, since sludge is generated when quenching, the factory where quenching is performed has a relatively large amount of dust. In addition, it is necessary to quench the steel material during quenching, and there are many occasions where dust and dust are scattered by water vapor generated at that time.
On the other hand, the metal surface of the bus bar is exposed, and dust or dust may fall on the bus bar.
Further, the bus bar is charged because it is always energized, and dust and dirt in the factory may be attracted.

As described above, since the bus bars are stacked with the insulating sheet interposed therebetween, the sides of the bus bars are close to each other and are electrically different in polarity.
That is, as shown in FIG. 17, assuming a vertical bus bar array, the upper side 37 a of the U-side bus bar 37 and the upper side 38 a of the V-side bus bar 38 are close to each other and naturally have different electrical polarities.
Then, dust and dust 36 flying in the air gradually accumulate on the upper side 37a of the U-side bus bar 37 and the upper side 38a of the V-side bus bar 38 as shown in FIGS. Finally, the deposit 39 passes over the insulating sheet 106 and communicates, and the U-side bus bar 37 and the V-side bus bar 38 are electrically short-circuited.

  In view of the above, the present invention focuses on the above-described problems of the prior art and aims to develop an induction heating apparatus that can prevent short-circuiting due to dust or dust.

  The invention according to claim 1 for solving the above-described problem has an oscillator, a transformer, an induction heating coil, and a conductive member that electrically connects between them, and a part of the conductive member. Alternatively, in the induction heating apparatus for metal heat treatment, in which the whole is a metal plate, and the metal plates are arranged in parallel and the insulating material is sandwiched between both, the side of one metal plate and the metal plate There is a corresponding side of the metal plates arranged in parallel with each other, and a covering member that covers the two sides is provided.

The induction heating device of the present invention covers two sides with a high possibility of short-circuiting with a covering member.
Therefore, deposits such as dust do not come into contact with the side portions, and no short circuit occurs.

  The induction heating device of the present invention has an effect that a short circuit hardly occurs and there are few failures.

It is a perspective view of the induction hardening apparatus explaining the outline | summary of the bus bar wiring in embodiment of this invention. It is a perspective view of the vertical attitude | position part of the bus bar row | line | column shown in FIG. It is a disassembled perspective view of the bus bar row | line | column shown in FIG. It is a perspective view of the vertical attitude | position part of the bus bar row | line | column of other embodiment of this invention. It is a disassembled perspective view of the bus bar row | line | column shown in FIG. It is a perspective view of the vertical attitude | position part of the bus bar row | line of further another embodiment of this invention. It is a disassembled perspective view of the bus bar row | line | column shown in FIG. It is a side view of the vertical attitude | position part of the bus bar row | line of further another embodiment of this invention. It is a perspective view of the state which provided the covering member in the long side of both the horizontal attitude | position parts of the bus bar row | line | column shown in FIG. It is explanatory drawing which shows the structure of the induction hardening apparatus in this invention and a prior art. It is a perspective view of the induction hardening apparatus explaining the outline | summary of the bus bar wiring in a prior art. It is a cross-sectional perspective view of the horizontal pulling part of the bus bar row shown in FIG. It is a disassembled perspective view of the horizontal pulling part of FIG. (A) is an exploded side view of the horizontal pulling part of FIG. 3, (b) is a side view. It is a perspective view of the step part of the bus bar row | line | column shown in FIG. It is a disassembled perspective view of the step part of the bus bar row | line | column shown in FIG. It is a side view of the vertical attitude | position part of the bus bar row | line | column shown in FIG. (A) thru | or (d) is explanatory drawing which shows the state in which dust etc. accumulate on the vertical attitude | position part of a bus bar row | line | column.

Embodiments of the present invention will be further described below.
The induction hardening apparatus (induction heating apparatus) 1 of this embodiment includes a power supply unit 5 including a high frequency oscillator 2 (including an AC commercial power supply), a capacitor 3 and the like, a transformer 6, and induction heating, as in the prior art. It is constituted by a coil 8 or the like. The space between them is wired by the conductive members 10 and 11, and the high-frequency current generated by the power supply unit 5 is transformed by the transformer 6 and supplied to the induction heating coil 8.

Also in the induction hardening apparatus 1 of the present embodiment, the periphery of the capacitor 3 is wired by the bus bar array 50.
The difference between the induction hardening apparatus 1 of the present embodiment and the prior art is the configuration of the bus bar array 50.
That is, the bus bar row 50 employed in the present embodiment has a covering member 60 mounted on the mating portion of the long side of the U-side horizontal bus bar 22 and the long side of the V-side horizontal bus bar 23 as shown in FIGS. Yes.
For example, in the induction hardening apparatus 1 of this embodiment, the covering member 60 is provided in the vertical posture part like the C part of FIG.
In the present embodiment, the covering member 60 is attached only to the upper side of the vertical posture portion.

The covering member 60 is a long object formed in advance using a material having insulating properties and elasticity such as rubber.
That is, the covering member 60 has a curved portion 64 and an open end 65 such that the cross-sectional shape thereof is a “C” shape, a “U” shape or an omega shape (“Ω”), and a space 61 is provided therein. There is a shape having an opening 62 in part. Open ends 65 are respectively provided at both ends of the bending portion 64. The opening ends 65 are close to each other and the distance between them is smaller than the total thickness of the U-side horizontal bus bar 22, the V-side horizontal bus bar 23, and the insulating sheet 102.
In the cover member 60, the curved portion 64 has elasticity, and the elasticity acts in the direction in which the opening 62 is closed (arrow X direction).

Therefore, the covering member 60 opens the opening 62 against the elastic force, and is attached to the mating portion of the long side of the U-side horizontal bus bar 22 and the long side of the V-side horizontal bus bar 23.
Therefore, the opening end 65 of the covering member 60 presses the flat surface portion 66 of the U-side horizontal bus bar 22 and the flat surface portion 67 of the V-side horizontal bus bar 23 and is in close contact with both flat surface portions 66 and 67.
As described above, since the cover member 60 has the space 61 therein, the long side 70 of the U-side horizontal bus bar 22 and the long side 71 of the V-side horizontal bus bar 23 are covered with the cover member 60.

That is, the bus bar row has a U-side horizontal bus bar 22 that is a single metal plate and a V-side horizontal bus bar 23 that is a metal plate that is superimposed on the U-side horizontal bus bar 23, and an insulating sheet 102 is sandwiched therebetween. The width W of the U-side horizontal bus bar 22 and the V-side horizontal bus bar 23 are substantially the same, and the long-side surface of the U-side horizontal bus bar 22 and the corresponding long-side surface of the V-side horizontal bus bar 23 are the insulating sheet 102. Close to each other.
In this embodiment, there is a covering member 60 that covers two sides, and the covering member 60 covers the long side of the U-side horizontal bus bar 22 and the corresponding long side of the V-side horizontal bus bar 23 with the covering member 60. It has been broken.
More precisely, the rectangular end surface constituting the long side of the U-side horizontal bus bar 22 and the rectangular end surface constituting the long side of the V-side horizontal bus bar 23 are covered with the covering member 60.
Therefore, dust or the like does not accumulate on the long side of the U-side horizontal bus bar 22 and the long side of the V-side horizontal bus bar 23, and the U-side horizontal bus bar 22 and the V-side horizontal bus bar 23 do not short-circuit.

The shape of the covering member is not limited to the above, and may be a stepped shape such as the covering member 80 shown in FIGS.
That is, the covering member 80 has a flat portion 81 in contact with the flat portion 66 of the U-side horizontal bus bar 22, a flat portion 81 in contact with the flat portion 67 of the V-side horizontal bus bar 23, and a “convex” shaped portion 82 that connects the two. doing.
The covering member 80 does not necessarily have elasticity.
The covering member 80 is attached as shown in FIG. 5 by covering the upper end surfaces of the U-side horizontal bus bar 22 and the V-side horizontal bus bar 23 from above.

Further, the covering members 60 and 80 described above are all hollow, but may have a solid structure like the covering member 83 shown in FIGS.
The covering member 83 is a solid long member having elasticity, and a cut 84 is provided in part. The cut 84 is opened and attached to the upper end surfaces of the U-side horizontal bus bar 22 and the V-side horizontal bus bar 23.

  Furthermore, like the covering member 85 shown in FIG. 8, the upper side of the U side horizontal bus bar 22 and the V side horizontal bus bar 23 may be covered with a clay-like material.

In the above, the vertical posture portion has been described as an example, and the example in which the covering member 60 (80, 83, 85) is provided only on the upper side has been described. Of course, the covering member 60 (80, 83, 85) is provided on the upper and lower sides. May be provided.
For example, as shown in FIG. 9, it is desirable to provide covering members 60 (80, 83, 85) on both long sides of the horizontal posture portion such as the AA portion (FIG. 1).
It is recommended to provide covering members 60 (80, 83, 85) on both long sides of a portion bent in a step shape such as the B portion (FIG. 1).

Each of the embodiments described above has been developed for the purpose of preventing a short circuit of the bus bar, but an effect of preventing the generation of noise can be expected as a secondary effect.
That is, the induction heating device may generate low frequency sound when energized. If the cover members 60, 80, 83, 85 are attached to the sides of the bus bar as in the present embodiment, the vibration of the bus bar is suppressed, and a decrease in low frequency sound can be expected.

1,100 Induction hardening device (induction heating device)
2 High-frequency oscillator 6 Transformer 8 Induction heating coil 10, 11 Conductive member 60, 80, 83, 85 Cover member

Claims (1)

  An oscillator, a transformer, an induction heating coil, and a conductive member that electrically connects between them, and a part or all of the conductive member is a metal plate, and the metal plates are arranged in parallel to In an induction heating apparatus for heat treatment of metal that is wired with an insulating material interposed therebetween, there are sides of one metal plate and corresponding sides of the metal plate arranged in parallel with the metal plate, and the two An induction heating apparatus characterized in that a covering member for covering the side is provided.

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