JPS5825097A - Induction heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inductor coil of a plane heating type induction heating device that heats objects to be heated, such as slabs, hot bars, or strips in a steel rolling line, by the electromagnetic induction action of the inductor coil. It is related to the device.

Figures 1 (4) and (B) are a front sectional view and a side sectional view showing the inductor fill device of this conventional mild induction heating device;
) is a laminated core constructed by laminating approximately 1-shaped silicon steel plates to a predetermined thickness.
As shown in Figure 1, a plurality of water-cooled steel plates (13) are interposed at predetermined intervals to cool the heat generated in the laminated core (1) and the water-cooled copper plate. tm
A plurality of insulating bolts (8) penetrate the laminated core (1) in the laminating direction and tighten and fix them together. It is configured to be electrically insulated from the steel plate (Tsuru).In addition, the inductor filter (4) is wound around the central leg (No. 1) of the laminated core (11) a predetermined number of times.
It is constructed of a hollow steel pipe whose outer surface is insulated and which allows cooling water to flow inside.

(6) is heat-resistant concrete in which the laminated iron core (1) and the inductor coil are buried so as to enclose them.
This heat-resistant concrete (+5) is used to transfer the heat of the heated object (6) heated by the electromagnetic induction action of the inductor coil (4) to the laminated iron core (dish), insulating pole) Ial * and the inductor coil (4). ), etc.

Note that the above-mentioned inductor coil device is
Although we have described the case where only the MKs are placed facing each other with a predetermined gap, a single inductor coil device configured as described above is generally used not only on the upper and lower surfaces of the object to be heated (5) but also on the upper and lower surfaces of the object to be heated (5). 6), so that the object to be heated (6) is simultaneously induction heated from its surroundings. And, the inductor coil 1 of each of the above-mentioned induction coil devices
3), the alternating magnetic flux tbl generated by passing a predetermined alternating current through the laminated iron core (1) and the object to be heated (8) passes through a closed circuit passing through the object to be heated (8), and is generated in the object to be heated (6). The temperature of the object to be heated rises due to Joule heat generated by the eddy current. Note that the temperature inside this sharpened laminated iron core (1) also rises due to Joule heat, but this is cooled by the water-cooled copper plate +21.

In general, in the case of the above-mentioned laminated iron core, end plates with considerable rigidity are overlapped at the ends of both layers, and the thin silicon steel plates at both ends are tightened in the lamination direction with tightening bolts to prevent the thin silicon steel plates at both ends from turning over. However, in conventional induction heating equipment, it is not possible to use iron plates as the end plates of the laminated iron core +11, as the disturbance of the alternating magnetic flux becomes severe in the induction heating equipment. Although the scepter is used as an end plate, the disturbed alternating magnetic flux is caused by this water-cooled copper plate 11.
Since the amount of interlinking is extremely large, insufficient cooling of the steel plate may occur, causing it to become red-hot, and this phenomenon has naturally been a drawback of significantly reducing the electrical efficiency of the inductor coil (4).

This invention was made with attention to this point, and as an end plate for overlapping both types of layer ends 5 of a laminated core, for example, 50
It is an object of the present invention to provide an induction heating device which eliminates the above-mentioned drawbacks by using an insulating plate having heat resistance of 0° C. or higher.

That is, FIG. 2 tA) 01) is a front sectional view and a side sectional view showing one embodiment of the present invention, and the same reference numerals as in the above-mentioned conventional one (FIG. 1) refer to the same constituent members. I will omit the explanation.

ff) ffl is a heat-resistant insulating plate superimposed on the ends of both layers of the laminated core (1), and these heat-radiating insulating plates (7) (7) are made up of a plurality of water-cooled steel plates ( Together with the laminated core (1) made of powder-interposed silicon steel sheets, this laminated core (1) is
) K is integrally tightened and fixed, and this heat-resistant insulating plate (γ)
The zinc oxide boric acid bonded complex, which has a heat resistance of 500°C or more and is generally called "Miolex",
A silica board, an aluminum board, a magnesia board, a pressure-molded product of fibrous ceramics and an organic binder, or a charcoal-fired silicon, aluminum board, steatite, fired ceramic board, etc. may be used.

As described above, the present invention uses a heat-resistant insulating plate (ffl ff) as an end plate to be superposed on the ends of both layers of the laminated core (1).
Since the heat-resistant insulating plate (7) is a non-conductor, the loss generated by it is extremely small (in contrast to the conventional method, which significantly reduces the electrical efficiency of the inductor coil (4)). It goes without saying that the heating device is 0.
It also has the effect of preventing zero damage to each component and significantly extending the life of these components. Also,
If the laminated thickness of the silicon steel plates at the laminated ends is appropriately selected, it is possible not only to suppress the temperature rise of the laminated core within the safety limits by cooling the water-cooled steel plates (layers), but also to suppress the temperature rise of the laminated core (1).

Insulating bolts (7), inductor coils (4), etc. are buried in heat-resistant concrete (5), and these are connected to the heated object (
Since the laminated core (1) is protected from high-temperature radiant heat from the laminated core (1), there is no need to water-cool the ends of both layers of the laminated core (1) with water-cooled steel plates, as in the conventional case.

It goes without saying that the present invention can be applied not only to the protection of the laminated core of the induction heating device described above, but also to the protection of a seam annealer core used for annealing the welds of an electric welding device, for example.

[Brief explanation of the drawing]

Figures 1 (4) and (B) are a front sectional view and a side sectional view showing a conventional induction heating device, and Figures 2 (4) and 2) are a front sectional view and a side sectional view showing an embodiment of the present invention. FIG. In the drawings, (1) is a laminated iron core, (A is a water-cooled steel plate, Ill is an insulating bolt, (4 is an inductor coil, T is a heat-resistant concrete, (6) is an object to be heated, and (7) is an insulating bolt. It is a heat-resistant insulating board.The same reference numerals in the figures indicate the same or corresponding parts. Agent Ge Shuxin - Figure 1 (A) (B) Figure 2 (A) (B)

Claims (1)

[Claims] (!) The invention is characterized by using heat-resistant insulating plates as end plates superimposed on both lateral layer ends of a laminated core in which an inductor coil facing the object to be heated is wound at a predetermined position. Induction heating device. (Claim No. 1, characterized in that a zinc oxide boric acid bonded composite, silica board, alumina board, magnesia board, steatite, fired ceramic electric wire, etc.) is used as the heat-resistant insulating board. The induction heating device according to claim 1. 121) The induction heating device according to claim 1, characterized in that the inductor coil and the laminated iron core are embedded in a predetermined position within a heat-resistant plate/cleat.