JPS6016075Y2 - electromagnetic induction heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an electromagnetic induction heating device.

FIG. 1 is a sectional view showing a conventional device.

In the figure, 1 is an iron core device, which has an opposing surface 1a and has an iron core 2.
a It is composed of a water cooling jacket 2b for cooling the iron core 2a, and an iron core structure 3 for integrating the iron core 2a and the water cooling jacket 2b.

Reference numeral 4 denotes a heating coil device for electromagnetic induction electrically insulated around a coil 4a made by winding a water-cooled steel pipe around the iron core device 1; 5 a heating coil device for electromagnetic induction, which is inserted so as to face the opposing surface 1a, and a predetermined portion is heated by induction; Object 6 is a protective member having fireproof heat insulation to prevent the radiant heat from the object 5 to be heated from being directly applied to the iron core device 1.

The conventional device is constructed as described above. For example, when the object to be heated 5 is made of steel, the object to be heated 5 is induction heated by supplying the necessary power to the heating coil device 4.

The heated object 5 is usually 1000'C to 1250QC! The radiant heat causes the temperatures of the iron core device 1 and the heating coil device 4 to rise.

In particular, the central part of the iron core 2a has a weak water cooling effect due to its structure, so the temperature rise is the greatest, the function of the surface coachib material of the silicon steel plate deteriorates, and the silicon steel plate itself is greatly oxidized and consumed.

Further, due to the structure of the heating coil device 4, the heat resistance temperature of the treated electrical insulator is limited to approximately 300° C., resulting in significant functional deterioration and short lifespan.

In this case, if you want to achieve a predetermined temperature rise value only in a predetermined range of the heated object 5, due to the nature of electromagnetic induction heating, it is important to make the distance between the iron core 2a and the heated object 5 as small as possible in terms of accuracy and electric power. However, the conventional protection member 6
When using , there was a drawback that a satisfactory result could not be obtained.

That is, when the material of the protective member 6 is resin, asbestos, natural mica, etc., the surface temperature thereof needs to be 500° C. or less.

Therefore, it is necessary to provide a large distance between the object to be heated 5 and the protection member 6, which is not suitable for the purpose.

In addition, if the material of the protective member 6 is made of fireproof and heat insulating castable, it can withstand the radiant heat from the object to be heated 5, but
It was easily damaged and detached from vibrations and cooling/heating cycles, making it impossible to create anything as intended.

Therefore, in the conventional induction heating device, the iron core device 1
It is not possible to make the distance between the heated object 5 and the heated object 5 less than 2, and there is a drawback that it is impossible to manufacture a highly reliable device that can raise the temperature of only a predetermined range of the heated object 5 to a predetermined temperature rise value. .

FIG. 2 is a partial sectional view showing another conventional device, and in the figure, numerals 1, 2, 3, and 4.5 are the same as those in FIG.

7 is a heat shield plate for preventing radiant heat from the heated object 5 from being applied to the iron core device 1 and the heating coil device 4; 8 is a water cooling jacket for cooling the heat shield plate 7;

The one shown in FIG. 2 uses a heat shield plate 7 and a water cooling jacket 8 in place of the protective member 6 shown in FIG.

In this case, the radiant heat from the object to be heated 5 is absorbed by the heat shield plate 7 and the water cooling jacket 8, and the temperatures of the iron core device 1 and heating coil device 4 do not rise.

However, by supplying power to the heating coil device 4, the generated magnetic flux passes through the heat shield plate 7 and the water cooling jacket 8, causing eddy current loss therein and reducing electrical efficiency.

Therefore, in order to obtain a predetermined temperature rise value in a predetermined range of the heated object 5, 20 to 100% extra power must be supplied to the heating coil device 4, which makes the device larger than necessary and expensive. Therefore, it had the disadvantage of being impractical.

This idea sinters a heat-resistant and heat-insulating mica paint on the surface of the iron core, and integrates the coil device with the iron core using a fire-resistant insulating castable, making it possible to reduce the distance between the iron core device and the heated object. Therefore, the present invention provides an induction heating device that has good electrical efficiency, is inexpensive, and can raise the temperature of a predetermined range of a heated object to a predetermined temperature rise value.

The figures will be explained below.

FIG. 3 is a sectional view showing an embodiment of this invention.

In the figure, 1.2, 3, and 4.5 are the same as the conventional ones.

9 is a protective member made of a heat-resistant heat-insulating synthetic mica paint applied to cover the facing surface 1a of the core device 1; 10 is a heat-resistant heat-insulating felt disposed to protect the heating coil 4a; 1;
1 shows a fireproof heat insulating castable cast for the protection of the heating coil device 4.

An example of a heat-resistant and heat-insulating synthetic mica paint is a special silicone base highly filled with synthetic mica, which is in liquid form and gradually sinters at 350'C or higher after application, resulting in a ceramic-like film. It has good adhesion, has electrical insulation properties, is resistant to cold and heat cycles, and has stable performance even at 1200°C.

Further, as an example of the heat-resistant heat insulating felt 10, a glass or ceramic mat or cloth is used depending on the withstand temperature thereof.

In the structure configured as described above, the protection member 9 is 0.
．． Opposing surface 1a of iron core device 1 with a thickness of about 5 to 3 m+y+
Since it is continuously applied to a part of the side surface of the iron core device 1, that is, the entire surface facing the object to be heated 5, the progress of oxidation of the iron core 2a etc. at high temperatures is such that it becomes a practical problem. do not become.

On the other hand, the electrically insulated heating coil device 4 is first covered with a heat-resistant insulating felt 10 to protect it from the heat from the object to be heated 5.

Further, after combining them, a fire-resistant heat-insulating castable 11 is cast around the entire circumference of the heating coil 4 and the heat-resistant heat-insulating felt 10 for heat-proofing, waterproofing, dust-proofing, and fixing the heating coil 4 and the heat-resistant heat-insulating felt 10.

As a result, the protective member 9 and the fireproof heat insulating castable 1
Even if 1 is damaged during use, it can be easily repaired on site.

In addition, the heat-resistant heat-insulating felt 10 is made of fire-resistant heat-insulating castable 1
The scale that has entered through the crack 1 can be blocked before the heating coil device 4, and layer short-circuits of the heating coil device 4 can be prevented.

As a matter of course, the protective member 9 is sufficiently thin compared to conventional devices and can withstand temperatures of 1200° C., so that the distance between the core device 1 and the object to be heated 5 can be made sufficiently small.

In the above embodiment, the protective member 9 is applied to the facing surface 1a of the iron core device 1, but by applying the protective member 9 to the surface facing the heated object 5, the coil device 4
can improve the insulation properties of

Furthermore, although the above embodiments have described an electromagnetic induction heating device, similar effects are expected when applied to electromagnetic pumps and electromagnetic transport devices that move and transport high-temperature objects.

According to this idea, the core device and the coil device are integrated with a castable that has fire-resistant and heat-insulating properties, and a protective member made of sintered mica paint that has heat-resistant and heat-insulating properties is attached to at least the facing surface of the core device that faces the object to be heated. By doing so, the distance between the object to be heated and the iron core device can be reduced, so that the object to be heated can be locally heated with high precision using small electric power.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing a conventional electromagnetic induction heating device, Fig. 2 is a sectional view showing another conventional device, and Fig. 3 is a sectional view showing an embodiment of this invention. It is. In the figure, 1 is an iron core device, 2a is an iron core, 2b is a water cooling jacket, 4 is a coil device, 5 is an object to be heated, 9 is a protection member, and 11 is a castable. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] An iron core device consisting of an iron core and a water-cooled jacket and having a surface facing the object to be heated, a coil device wound around this iron core device and integrated with the iron core by a castable having fire-resistant and heat-insulating properties, and a coil device having heat-resistant and heat-insulating properties and having at least the above-mentioned An electromagnetic induction heating device equipped with a protective member made of sintered mica paint on the opposing surface of the iron core device.