JP2587326Y2 - Induction heating device inductor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a support structure of a water-cooled pipe embedded in a heat-insulating plate for protecting the surface of an inductor for continuously heating a material to be heated which is conveyed.

[0002]

2. Description of the Related Art Generally, an inductor of an induction heating apparatus for heating a material to be heated such as a steel rolling line by continuously running the material is conventionally configured as shown in FIG. The inductor of this induction heating device is formed by winding a water-cooled copper tube around the outer periphery of a laminated iron core 1 to form a heating coil 2, and is formed of refractory castable cement 4 on the surface side of the heating coil 2 facing the material 3 to be heated. A heat-insulating plate 5 is provided to protect the heating coil 2 from the radiant heat of the material 3 to be heated.

The inductors of this induction heating apparatus are installed so as to sandwich both ends of the material to be heated 3 from above and below, respectively, and heat the traveling material to be heated 3 by induction heating to locally heat both ends having a large temperature drop. It is supposed to. In this case, the smaller the gap between the inductor and the material to be heated 3 is, the better the heating efficiency is. Is set to

Therefore, the material to be heated 3 is induction-heated to about 1100 ° C., and a heat-insulating plate 5 is provided to protect the heating coil 2 from this radiant heat. Is short. Therefore, as shown in FIG. 4, the meandering water-cooled pipe 6 is embedded in the refractory castable cement 4 and cooled from the inside of the heat-insulating plate 5. This heat-insulating plate 5 is supported by bending the tip of a stainless steel cover 8 attached to a base 7 on which the heating coil 2 is supported into an L-shape, The structure is such that the portion 10 is engaged and supported.

However, since the heat-resistant heat insulating plate 5 uses the refractory castable cement 4 as a heat insulating material, if the refractory castable cement 4 is used for a long period of time, cracks gradually occur due to heat shock, and the refractory castable cement 4 peels off and falls off. There is. Since only the peripheral edge portion 10 of the heat-insulating plate 5 is supported by the bent portion 9 of the stainless steel cover 8,
When the refractory castable cement 4 falls off, the water-cooled pipe 6 buried inside cannot be supported as shown in FIG. 5, and the water-cooled pipe 6 bends and comes into contact with the material to be heated 3 traveling below, leading to a major accident. There is fear.

[0006] When the oxide scale of the material to be heated 3 is attracted by the magnetic force of the heating coil 2 and penetrates the refractory castable cement 4, particularly when the refractory castable cement 4 is cracked and peels off, the insulation of the heating coil 2 is reduced. There was a risk of destruction. Further, since the stainless steel cover 8 needs to be formed of a thick plate to support the heavy heat-resistant heat insulating plate 5, the weight becomes heavy and power is lost due to heat generated by the induced current generated here. there were.

[0007]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and even if the refractory castable cement falls off, the water-cooled pipe is supported to prevent contact with the material to be heated. It is an object of the present invention to provide an inductor for an induction heating apparatus, which prevents the dielectric breakdown of the above and further reduces the power loss by reducing the weight by forming the cover with a thin plate.

[0008]

According to the present invention, a heat-resistant insulating plate having a water-cooled heating coil wound around an iron core and a water-cooled pipe formed of a non-magnetic material embedded therein is heated to a position facing a material to be heated. In the inductor of the induction heating device provided on the surface side of the coil, one end of a stud formed of a non-magnetic material is joined to the water-cooled pipe, and the other end is provided between the heat-resistant heat insulating plate and the heating coil. And the insulating plate is connected to a base on which the heating coil is supported by studs.

[0009]

The inductor of the induction heating device of the present invention is installed so as to sandwich both ends of the material to be heated from above and below, and when the heating coil is energized, the material to be heated continuously running between the children is induction heated. . In addition, cooling water is supplied to a water cooling pipe buried in the heat-insulating plate to cool the inside and protect the heating coil from radiant heat of the material to be heated heated to a high temperature.
The heat-resistant heat-insulating plate may gradually crack due to heat shock and peel off and fall off.However, since the water-cooled pipe is hung on the insulating plate with studs, it does not bend, and Can be prevented from coming into contact with.

[0010] Even if the oxide scale of the material to be heated penetrates the refractory castable cement, the oxide scale cannot penetrate due to the provision of a high hardness insulating plate between the heating coil and the heating coil. Can be prevented. The heat-insulating plate is formed integrally with the water-cooled pipe and is suspended from the insulating plate with studs, so the cover can be made of a thin plate, and the heat generated by the induced current generated here is reduced to reduce power loss. be able to.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. An inductor of this induction heating device is configured by winding a water-cooled copper tube around an outer periphery of an iron core 1 and heating a coil 2.
A heat-insulating plate 5 made of refractory castable cement 4 is provided on the surface of the heating coil 2 facing the material 3 to be heated. As shown in FIG. 2, the heat-insulating plate 5 is buried in a refractory castable cement 4 by welding the lower ends of stainless steel studs 12 at predetermined intervals to a meandering water-cooled pipe 6, and the upper end is refractory castable. It slightly protrudes from the upper surface of the cement 4.

An insulating plate 13 made of, for example, a glass fiber laminate is provided on the upper part of the heat-insulating plate 5. The upper end of the stud 12 joined to the water-cooled pipe 6 penetrates and is connected by a nut 14 made of stainless steel. The water cooling pipe 6 is directly hung by the insulating plate 13. A lower end of a stud 15 made of stainless steel is connected to a corner portion of the insulating plate 13, and this upper end penetrates the base 7 and is connected by a nut 14 made of stainless steel as shown in FIG. Reference numeral 17 denotes a stud for supporting the heating coil 2 on the base 7, and reference numeral 18 denotes a terminal plate connected to an end of the heating coil 2. Further, the tip of a stainless steel cover 8 attached to the base 7 is bent into an L-shape, and the peripheral portion 10 of the heat-resistant and heat-insulating plate 5 is supported by engaging the bent portion 9.

The inductors of this induction heating device are installed so as to sandwich both ends of the material 3 to be heated from above and below, and when the heating coil 2 is energized from the terminal plate 18, the material 3 running continuously is induction heated. In addition, both ends having a large temperature drop are locally heated. Cooling water is supplied to the water cooling pipe 6 to cool the heat-resistant heat insulating plate 5 from the inside, thereby protecting the heating coil 2 from radiant heat of the material 3 to be heated, which is heated to a high temperature. If the refractory castable cement 4 is used for a long time, the heat-resistant insulating plate 5 formed of the refractory castable cement 4 may gradually crack due to heat shock, and the refractory castable cement 4 may peel off and fall off. However, even if the refractory castable cement 4 falls off, the water-cooled pipe 6 is hung by the stud 12 on the insulating plate 13 formed of a high-strength glass fiber laminate, so that it does not bend, so Contact with the heating material 3 can be reliably prevented.

Further, even if the oxide scale of the material to be heated 3 is attracted by the magnetic force of the heating coil 2 and penetrates the refractory castable cement 4, or if the refractory castable cement 4 cracks and peels off, the heating coil 2 Is provided with an insulating plate 13 having a high hardness formed of a glass fiber laminate, so that the oxide scale cannot penetrate therethrough.
Can also be prevented from dielectric breakdown. In addition, heat-insulating plate 5
Is suspended on the base 7 via the stud 12, the insulating plate 13 and the stud 15, so that the load applied to the stainless steel cover 8 is small. In addition, heat generation due to the induced current generated here can be reduced, and power loss can be suppressed.

In the above embodiment, the case where a glass fiber laminated plate is used as the insulating plate 13 has been described, but another material having strength and insulating properties may be used.

[0016]

As described above, according to the inductor of the induction heating device according to the present invention, even if the refractory castable cement falls off, the water cooling pipe is horizontally supported to prevent contact with the material to be heated and to prevent oxidation. The insulation breakdown of the heating coil due to the penetration of the scale can be prevented, and the cover can be formed of a thin plate to reduce the weight and reduce the power loss.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an inductor of an induction heating apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a water-cooled pipe buried in the heat-resistant heat insulating plate of FIG. 1 is connected to the insulating plate by studs.

FIG. 3 is a cross-sectional view showing a conventional inductor.

FIG. 4 is a perspective view showing a state in which the heat-insulating plate of FIG. 3 is inverted.

FIG. 5 is a cross-sectional view of the inductor showing a state in which a water-cooled pipe is bent and comes into contact with a material to be heated.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Iron core 2 Heating coil 3 Material to be heated 4 Refractory castable cement 5 Heat resistant heat insulating plate 6 Water cooling pipe 7 Base 8 Cover 12 Stud 13 Insulating plate 14 Nut 15 Stud

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuji Doizaki 1-1-1, Shibaura, Minato-ku, Tokyo Inside the head office of Toshiba Corporation (72) Inventor Kenji Takaoka 1st Kokancho, Fukuyama City, Hiroshima Japan Japan Inside of Fukuyama Steel Works, Steel Pipe Co., Ltd. (56) References JP-A-63-16595 (JP, A) JP-A-59-71284 (JP, U) JP-A-62-96296 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) H05B ^6/ 00-6/10 H05B ^6/ 14-6/44

Claims (1)

(57) [Scope of request for utility model registration] 1. A water-cooled heating coil is wound around an iron core,
A heat-insulating plate in which a water-cooling pipe formed of a non-magnetic material is embedded inside, an inductor of an induction heating device provided on a surface side of a heating coil facing a material to be heated, wherein the water-cooling pipe is formed of a non-magnetic material. One end of the stud is joined, the other end is connected to an insulating plate provided between the heat-insulating plate and the heating coil, and the insulating plate is connected to a base on which the heating coil is supported by a stud. The inductor of the induction heating device.