JPH0515753Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an induction heating coil for heating hot-rolled steel plates, etc., and particularly to improvement of its exterior material.

[Conventional technology]

Figure 3 shows a conventional induction heating coil shown in Utility Model Application No. 57-151894. In the figure, 1 is an iron core, 2
3 is a winding, 3 is a fireproof concrete for fixing this winding 2 to the core 1, and 4 is a fireproof concrete for protecting the core 1, the winding 2, and the fireproof concrete 3 from the radiant heat of the hot-rolled steel plate 5, which is an object to be heated. It is a heat insulating layer that is an exterior material for

The conventional induction heating coil is configured as described above, and is installed facing the hot-rolled steel plate 5 that is the object to be heated. By the way, hot-rolled steel sheets usually have a temperature of 1000℃ or higher, and the installation distance between the induction heating coil and the heated object, the hot-rolled steel sheet, should be as small as possible from the viewpoint of electrical efficiency. 2. A heat insulating layer 4 is installed around the induction heating coil to protect the fireproof concrete 3 from the radiant heat of the hot rolled steel plate 5. Note that as this heat insulating layer 4, ceramic fiber is mainly used. Now, this kind of induction heating coil is generally installed in a place where it is necessary to cool the hot-rolled steel sheet during rolling, remove scale generated during rolling, or cool the rolling mill and other auxiliary equipment. A large amount of cooling water is used. Of course, there are cases where almost no cooling water is used, but in such cases, an induction heating coil with a conventional configuration can sufficiently perform its function.

[Problem that the invention attempts to solve]

If an induction heating coil is installed in a place where a large amount of cooling water is used as described above, the cooling water that drips onto the hot-rolled steel sheet or the cooling water that scatters from the rolling mill will be heated by induction. It will be applied to the coil. At this time, since the induction heating coil is covered with a water-absorbing heat insulating layer 4 such as ceramic fiber, cooling water and water vapor permeate from the surface to the winding 2 side, and finally reach the iron core 1 and winding 2 parts. reach

When operating in a wet state where water has penetrated into the core 1 and winding 2, voltage is applied to the winding 2, which deteriorates the electrical insulation and shortens the life of the device. There was a problem in that the temperature decreased significantly, which caused a major problem in equipment planning.

This invention was made to solve the above-mentioned problems, and aims to prevent cooling water from penetrating into the core and windings, and to obtain a highly reliable induction heating coil.

[Means for solving problems]

The induction heating coil according to this invention has its outer periphery covered with an exterior material having water resistance, heat insulation properties, and heat resistance.

[Effect]

The water-resistant, heat-insulating, and heat-resistant exterior material of this invention not only blocks splashing water and water vapor from near the installation location of the induction heating coil from penetrating into the iron core and windings, but also Protects the core and windings from radiant heat from heated materials such as hot-rolled steel plates.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. In Figures 1 and 2, 1 is the iron core, 2 is the winding, 3 is fireproof concrete for fixing the winding 2 to the iron core 1, 6 is the three-layer exterior material that covers the outer periphery of these, and 6a is the A sealing material having water resistance to prevent the penetration of splashed water or water vapor, 6b is the iron core 1,
A heat insulating material 6c has a heat insulating property to protect the winding 2 from the radiant heat of the hot rolled steel plate 5, and 6c has the function of withstanding the radiant heat of the hot rolled steel plate 5, repelling scattered water, and covering and holding the heat insulating material 6b from the outside. It is a protective material with

As the sealing material 6a, polyimide film or ceramic foil is used, as the heat insulating material 6b, ceramic paper, ceramic fiber blanket, ceramic cloth, etc. are used, and as the protective material, alumina long fiber cloth or the like is used. be done.

When the induction heating coil configured as described above is installed in a place where cooling water is splashed, the cooling water and water vapor are repelled by the protective material 6c of the induction heating coil, but some of it gradually penetrates into the insulation material 6b. I'll come.
Therefore, the heat insulating material 6b absorbs water or moisture,
Cooling water and water vapor are cut off by the water-resistant sealing material 6a provided inside the heat insulating material 6b, and the iron core 1, winding 2, and fireproof concrete 3 are kept in their original state without getting wet. It can exhibit excellent electrical insulation properties.

Since the sealing material 6a is provided inside the heat insulating material 6b, the heat resistance of this sealing material 6a is 300 to 400.
A temperature of about ℃ is sufficient. Further, the thickness of the sealing material 6a is preferably thin, in order to reduce the thermal gradient as much as possible to lower the temperature reached by the sealing material, and also from the viewpoint of workability in covering the iron core 1, the windings 2, and the fireproof concrete 3. That is, this sealing material is suitably in the form of a bendable film and made of a material that is water resistant and heat resistant. In addition, a container-shaped material made of a suitably thick material such as ceramics may also be used.

[Effect of idea]

As described above, according to this invention, even if the induction heating coil is installed in a place where cooling water is splashed, the core and windings will not become wet and the original electrical insulation properties can be demonstrated, and the cooling water will This makes it possible to install induction heating coils in locations where they are likely to be blown away, eliminating any problems with equipment planning.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a sectional view showing a conventional induction heating coil. In the figure, 1 is an iron core, 2 is a winding, 3 is fireproof concrete, 6 is an exterior material, 6a is a sealing material, 6b is a heat insulating material, and 6c is a protective material. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an induction heating coil equipped with an iron core and a winding, the outer periphery of the coil is sequentially coated from the inside with polyimide film or ceramic foil as a water-resistant sealing material, and the next layer is ceramic paper as a heat-insulating material. An induction heating coil characterized in that it is covered with a ceramic fiber blanket or a ceramic cloth, and an alumina long fiber cloth as a protective material having heat resistance, water repellency, and the function of protecting the above-mentioned heat insulating material as the outermost layer.