JP2002147965A - High frequency induction heating melting device for insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency induction heating melting device for an insulation material capable of continuously melting an insulating material without mechanical agitation only by charging an insulation material in succession. SOLUTION: In the high frequency induction heating melting device for an insulating material, a high frequency induction coil is situated at the outside of a furnace body, and an conductive container formed of a conductive material is situated at the internal part of the furnace body and provided at an upper part with a charge port for an insulation material and at a bottom part with an ejection hole for a molten insulation material. The conductive container is formed with a protrusion upward in the center of the bottom. Since an non- molten insulation material is positioned near the inner peripheral surface of the outer peripheral part of the conductive container, heating is apt to be applied from an inner peripheral surface. Simultaneously with melting, a heat insulation material near the central protrusion part collapses owing to its owing weight and is moved to the inner peripheral side and makes easy contact with the inner peripheral surface side, and continuous melting is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for melting an electric insulating material by high-frequency induction heating.

[0002]

2. Description of the Related Art In recent years, for example, for industrial wastes,
There is a high need to treat the generated waste while minimizing the amount of the generated waste, and it has been practiced to heat and dissolve and then solidify the waste, and it is also required to improve the efficiency.

FIG. 6 shows such a waste treatment plant 0
1 is a schematic cross-sectional view of a main part of one example. The waste 02 is put into the carry-in container 03, carried into the waste treatment plant 01, put into the melting furnace 04, and melted by the high-frequency induction coil 05 by high-frequency induction heating.

[0004] The melted waste 02 is put into the discharge vessel 06 from the melting furnace 04 and is discharged to the next processing step.

[0005] However, the high frequency induction heating method is widely used in the fields of refining and casting as well as waste treatment as a method capable of heating conductive materials at a high speed. Can be directly heated by induction, but insulating materials such as nonmetals cannot be directly heated.

Therefore, in order to heat and melt the insulating material by the high-frequency induction heating method, it is necessary to heat the conductive material and indirectly heat the insulating material with the heat.

A conventional high frequency induction heating and melting apparatus for insulating materials will be described below with reference to FIGS. FIG. 7A is a schematic cross-sectional view of an example of a conventional high-frequency induction heating and melting apparatus for insulating materials, and FIG. 7B is a plan view taken along line FF in FIG. FIG. 8A is a schematic cross-sectional view of another example.
FIG. 8B is a plan view taken along the line GG in FIG.

In FIG. 7, a column 7 of a conductive material is provided at the center of the furnace body 4a of the high-frequency induction heating and melting apparatus 4,
The insulating material 2 is arranged around the conductive material column 7, and the high-frequency induction heating of the conductive material column 7 by the high-frequency induction coil 5 makes it possible to indirectly heat and melt the insulating material 2.

In FIG. 8, a conductive container 8 made of a conductive material is disposed in a furnace body 4a of a high-frequency induction heating and melting apparatus 4 ', and an insulating material 2 is placed in the conductive container 8.
Then, high-frequency induction heating of the conductive container 8 with the high-frequency induction coil 5 makes it possible to indirectly heat and melt the insulating material 2. A hole 9 is provided in the bottom of the conductive container 8 so that the dissolved insulating material 2 can flow down.

In FIG. 7 and FIG. 8, the insulating material 2 melted in the furnace main body 4a is taken out of the conductive material column 7 or the conductive container 8 after the insulating material 2 is melted by a predetermined amount, and is subjected to high-frequency induction heating. The entire dissolution apparatus 4, 4 'is inclined and discharged.

[0011]

However, a conventional high-frequency induction heating and melting apparatus 4 for insulating material as shown in FIGS.
In this case, the insulating material 2 in contact with the conductive material column 7 or the conductive container 8 can be easily heated, but the contact area between them is relatively small, especially when the insulating material 2 is powdery or cottony. After the insulating material 2 in contact with the pillars 7 of the conductive material or the conductive container 8 is melted, the molten material flows down, so that the contact area between the two is further reduced, and it becomes difficult to continue melting. There was a problem. Therefore, in order to continue the melting, it is necessary to force the insulating material 2 into contact with the column 7 of the conductive material or the conductive container 8 by mechanical stirring or the like.

The present invention solves the above-mentioned problems of the conventional apparatus, and solves the problem of continuously dissolving the insulating material without mechanical stirring by merely charging the insulating material one after another. An object of the present invention is to provide a high-frequency induction heating and melting apparatus for an insulating material that can be used.

[0013]

Means for Solving the Problems (1) The present invention has been made to solve the above-mentioned problems, and the
A conductive container provided with a high-frequency induction coil outside the furnace main body, made of a conductive material inside the furnace main body, having an upper portion as an inlet for an insulating material, and having a through hole for the molten insulating material at a bottom portion. A high-frequency induction heating and melting apparatus for an insulating material, wherein the conductive container is formed with a convex central projection at the center of the bottom. Is what you do.

According to the first means, since the undissolved insulating material is located near the inner peripheral surface of the outer peripheral portion of the conductive container, the insulating material is easily heated from the inner peripheral surface. The heat insulating material collapses under its own weight, moves to the inner peripheral surface side, easily contacts the inner peripheral surface, and continuous melting is performed.

(2) As a second means, in the high-frequency induction heating and melting apparatus for insulating material according to the first means, the central projection has a shape taller than an outer peripheral portion of the conductive container. And a high-frequency induction heating and melting apparatus for an insulating material.

According to the second means, in addition to the action of the first means, the upper part of the central projection is heated by the high frequency induction heating to heat the insulating material, so that the heat contact area of the insulating material increases. .

(3) As a third means, in the high-frequency induction heating and melting apparatus for insulating material according to the second means, conductive outer peripheral fins are vertically oriented on side surfaces of the central projection to form the conductive container. Provided is a high-frequency induction heating and melting apparatus for an insulating material, which is provided so as to protrude toward an outer peripheral portion.

According to the third means, in addition to the action of the second means, the outer peripheral fin of the central projection heats the insulating material by receiving the high-frequency induction heating, so that the heat contact area of the insulating material increases. I do.

(4) As a fourth means, in the high frequency induction heating and melting apparatus for insulating material according to the second means, a groove formed from the top to the bottom is provided on a side surface of the central projection. And a high-frequency induction heating and melting apparatus for an insulating material.

According to the fourth means, in addition to the action of the second means, the contact area of the insulating material with which the insulating material is heated is increased by the groove of the central projection receiving the high-frequency induction heating.

(5) As a fifth means, in the high-frequency induction heating melting apparatus for insulating material according to any one of the first to fourth means, the conductive container is provided with a conductive material on an inner peripheral surface of an outer peripheral portion thereof. A high-frequency induction heating and melting apparatus for an insulating material, wherein inner fins are provided so as to be oriented vertically and protrude toward the center of the conductive container.

According to the fifth means, in addition to the function of any one of the first means to the fourth means, the inner fin on the inner peripheral surface of the outer peripheral portion of the conductive container is subjected to high-frequency induction heating to reduce the insulating material. Since the heating is performed, the heating contact area of the insulating material increases.

(6) As a sixth means, in the high-frequency induction heating melting apparatus for insulating material according to any one of the first means to the fifth means, the side surface of the central projection is formed from the upper side to the lower side. A high-frequency induction heating and melting apparatus for an insulating material, characterized in that the apparatus has a slope approaching the inner peripheral surface of a conductive container.

According to the sixth means, in addition to the function of any of the first to fifth means, the insulating material is further easily moved to the inner peripheral surface side.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency induction heating and melting apparatus for an insulating material according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1A is a schematic cross-sectional view of a high-frequency induction heating melting apparatus for an insulating material according to the present embodiment, and FIG. 1B is a plan view taken along the line AA in FIG.

The same parts as those of the above-mentioned conventional one are denoted by the same reference numerals also in FIG. 1 to clarify their mutual relations to facilitate understanding of the present embodiment, and to explain the same. Omitted. This applies to other embodiments described later.

As shown in FIG. 1, in the present embodiment, a conductive container 81 made of a conductive material in a furnace main body 4a of a high-frequency induction heating and melting apparatus 41 in a shape conforming to the inner peripheral surface thereof. Is arranged.

A high frequency induction coil 5 is provided around the furnace body 4a.
When the high-frequency induction coil 5 is energized by a power supply (not shown), high-frequency induction heating is performed on the inner peripheral side of the high-frequency induction coil.

The furnace body 4a is made of a refractory material such as magnesia MgO and is also an insulating material.
The radio wave itself is not heated by induction.

As shown in FIG. 1, the upper part of the conductive container 81 in this embodiment is an opening for charging the insulating material 2, and the flange part 81 protruding from the periphery near the upper end.
a, the flange portion 81a is placed on the step portion 10 provided on the inner peripheral surface of the furnace main body 4a, and the bottom of the conductive container 81 is spaced from the bottom surface of the furnace main body 4a.

An upwardly projecting central projection 11 is integrally formed at the center of the bottom of the conductive container 81, and the top 11a has a spherical surface so that the charged insulating material is not deposited. I have. Note that the shape of the top 11a may be any shape as long as it can prevent the upwardly convex accumulation.

The lower end of the central projection 11 is formed of a conductive container 81.
The bottom surface 81b is provided with a hole 9 through which the melted insulating material flows.

It is preferable that the side surface 11b of the central projection 11 has a slope approaching the inner peripheral surface 81c of the conductive container 81 from top to bottom.

In the high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment described above, the central projection 11 is provided at the center of the conductive container 81 so that the conductive container 81 is electrically conductive when heated by high-frequency induction heating. Outer peripheral portion 81 ′ of container 81
The insulating material 2 that is in contact with the inner peripheral surface 81c of the conductive container 8 melts and flows down through the hole 9 and then the undissolved insulating material 2 contacts the inner peripheral surface 81c of the outer peripheral portion 81 'of the conductive container 8. The dissolution is performed continuously by self-weight.

When the conductive material is heated by high-frequency induction heating, if the conductive material closest to the high-frequency induction coil is connected in a circumferential shape, the portion is heated by the flow of induction current. However, there is a principle that the induced current is not shielded and flows through the conductive material on the inner side of the conductive material and cannot be directly heated.

Therefore, also in the present embodiment, the heated portion of the conductive container 8 is only the outer peripheral portion 81 'closest to the high-frequency induction coil 5, but the insulating material 2 is continuously moved and brought into contact therewith. Therefore, a central projection 11 is provided at the center of the conductive container 81, and the undissolved insulating material 2 is positioned near the inner peripheral surface 81c of the outer peripheral portion 81 'of the conductive container 81, and the undissolved insulating material 2 Numeral 2 facilitates contact with the inner peripheral surface 81c.

For this reason, when the side surface 11b of the central projection 11 forms a slope approaching the inner peripheral surface 81c of the conductive container 81 from top to bottom, the insulating material 2 more effectively serves as the inner peripheral surface 81c. It is easy to move to the side, which is preferable.

The melted insulating material 2 flows down through the hole 9 and accumulates at the bottom in the furnace main body 4a. After the insulating material 2 has been melted by a predetermined amount, the conductive container 81 is taken out, and the high-frequency induction heating melting apparatus is used. Insulation material 2 with the entire 41 tilted and melted
To discharge.

A first experimental example according to the first embodiment will be described below.

The furnace body 4a of the high-frequency induction heating and melting device 41
A furnace having an inner diameter of 200 mm and a depth of 300 mm is used, and a conductive container 81 is provided therein as an outer diameter of 180 mm, a thickness of 5 mm,
150mm in height, 150mm in the lower part in the center, height 10
A SUS304 container provided with a central projection having a diameter of 0 mm, an upper diameter of 100 mm, and a spherical top surface was provided. Eight holes with a diameter of 8 mm were arranged concentrically at the bottom of the SUS container.

This vessel was heated to 1300 ° C. by high frequency induction, and a cotton-like insulating material of a composite oxide composed of Al ₂ O ₃ —SiO ₂ —MgO—CaO was charged from above. The inserted heat insulator melts by touching the inner peripheral surface of the outer peripheral portion of the SUS304 container, flows out from the hole, and the heat insulator near the central projection collapses under its own weight and collapses under its own weight. It moved to the surface side and dissolved continuously one after another. Even if the insulation is thrown in from the top one after another, the dissolution continues in the same way,
The time required to dissolve 10 kg of insulation was 1 hr.

As shown in the first experimental example, according to the high frequency induction heating and melting apparatus for insulating material of the present embodiment,
It was possible to continuously dissolve the material without adding mechanical stirring by merely charging the insulating material one after another.

Referring to FIG. 2, a high-frequency induction heating melting apparatus for an insulating material according to a second embodiment of the present invention will be described. FIG. 2A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment, and FIG.
FIG.

In the description of FIG. 2 of the present embodiment, the same parts as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and different points will be mainly described. This applies to other embodiments described later.

As shown in FIG. 2, in the present embodiment, a conductive container 82 made of a conductive material and having a shape conforming to the inner peripheral surface thereof is placed in a furnace main body 4a of a high-frequency induction heating and melting apparatus 42. Is arranged.

An upwardly projecting central projection 12 is integrally formed at the center of the bottom of the conductive container 82. The shape of the central projection 12 is the same as that of the first embodiment described above. It is.

The side surface 12b of the central projection 12 preferably has a slope approaching the inner peripheral surface 82c of the conductive container 82 from top to bottom.

A plurality (eight in FIG. 2) of conductive inner fins 82d are vertically arranged on the inner peripheral surface 82c of the outer peripheral portion 82 'of the conductive container 82 from the upper end to the lower end thereof. Are integrally formed or attached so as to protrude toward the center. The inner fin 82d is preferably made of the same material as the conductive container 82.

The hole 9 is provided on the bottom surface 82b of the conductive container 82 at a position to avoid the inner fin 82d.

In the high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment described above, the central projection 12 is provided at the center of the conductive container 82 and the inner peripheral surface 8 of the outer peripheral portion 82 '.
By providing the inner fins 82d in the conductive container 2c, the conductive container 82 is heated by high-frequency induction heating.
Inner peripheral surface 82c of outer peripheral portion 82 'of inner fin 8
The insulating material 2 that is in contact with 2d is melted and flows down through the hole 9 and the undissolved insulating material 2 is then deposited on the inner peripheral surface 82c of the outer peripheral portion 82 'of the conductive container 82 and the inner fin 82d. It moves under its own weight so as to come into contact with it and is continuously dissolved.

As described in the first embodiment,
The heated portion of the conductive container 82 is the high-frequency induction coil 5.
However, in the present embodiment, a central projection 12 is provided at the center of the conductive container 82 in order to continuously move and contact the insulating material 2 in this embodiment.
A plurality of inner fins 82d vertically oriented from the upper end to the lower end are provided on the inner peripheral surface 82c of the outer peripheral portion 82 'so as to project toward the center of the conductive container 82.

As a result, the insulating material 2 has an increased heating contact area due to the inner peripheral surface 82c and the inner fins 82d, so that the insulating material 2 is quickly melted, and the heat melting effect is improved.

The insulating material 2 is melted and flows down from the hole 9, and the undissolved insulating material 2 is removed from the conductive container 8.
The outer peripheral portion 82 'of the second member moves closer to the inner peripheral surface 82c and comes into contact with the inner peripheral surface 82c and the inner fin 82d.

Therefore, when the side surface 12b of the central projection 12 is inclined from the top to the bottom and approaches the inner peripheral surface 82c of the conductive container 82, the insulating material 2 can more effectively reduce the inner peripheral surface 82c. It is easy to move to the inner fin 82d side, which is preferable.

A second experimental example according to the second embodiment will be described below.

The furnace body 4a of the high-frequency induction heating and melting apparatus 42
A furnace having an inner diameter of 200 mm and a depth of 300 mm was used, and a container made of SUS304 was installed therein as the conductive container 82. The SUS304 container has an outer diameter of 180 mm and a wall thickness of 5
mm, height 150mm, center protrusion 150mm in height, 100mm in height, 100mm in upper part, top surface is spherical and 5mm in thickness, 8mm in width An inner fin was provided. Eight holes with a diameter of 8 mm were arranged concentrically at the bottom of the SUS container.

This container was heated to 1300 ° C. by high-frequency induction, and a cotton-like insulating material of a composite oxide composed of Al ₂ O ₃ —SiO ₂ —MgO—CaO was charged from above. The supplied heat insulator melts by touching the inner peripheral surface of the outer peripheral portion of the SUS304 container and the inner fin, and flows down from the hole, and the heat insulator near the central protrusion collapses under its own weight, causing the SUS304 container to collapse.
It moved to the inner peripheral surface side of the outer peripheral part of the container made of 4, and melted continuously one after another. The dissolution continued in the same manner even when the heat insulating material was added one after another from the top, and the time required for dissolving 10 kg of the heat insulating material was 55 minutes.

As shown in the second experimental example, according to the high frequency induction heating and melting apparatus for insulating material of the present embodiment,
It was possible to continuously dissolve the material without adding mechanical stirring by merely charging the insulating material one after another.

Referring to FIG. 3, a high-frequency induction heating and melting apparatus for an insulating material according to a third embodiment of the present invention will be described. FIG. 3A is a schematic cross-sectional view of a high-frequency induction heating melting apparatus for an insulating material according to the present embodiment, and FIG.
FIG.

As shown in FIG. 3, in the present embodiment, a conductive container 83 made of a conductive material in a furnace body 4a of a high-frequency induction heating and melting apparatus 43 in a shape conforming to the inner peripheral surface thereof. Is arranged.

At the center of the bottom of the conductive container 83, an upwardly projecting central projection 13 is integrally formed. The shape of the central projection 13 is the outer peripheral portion 83 'of the conductive container 83.
A point different from the first embodiment is that the top 13a of the central projection 13 is
Protrudes above 3 '.

An inner fin 83d similar to that of the above-described second embodiment is provided on an inner peripheral surface 83c of the outer peripheral portion 83 ', and a hole 9 avoids the inner fin 83d of the bottom surface 83b of the conductive container 83. Position.

It is preferable that the side surface 13b of the central projection 13 has a slope approaching the inner peripheral surface 83c of the conductive container 83 from top to bottom.

In the high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment described above, the central projecting portion 13 taller than the outer peripheral portion 83 ′ of the conductive container 83 is provided at the center of the conductive container 83. By providing the inner fin 83d on the inner peripheral surface 83c of the portion 83 ', the conductive container 8
3 is subjected to high-frequency induction heating, the upper portion of the central projection 13 is subjected to high-frequency induction heating, so that the insulating material 2 in contact with this portion, the inner peripheral surface 83c of the outer peripheral portion 83 'of the conductive container 83, and the inner fin The insulating material 2 that is in contact with 83d is melted and flows down through the hole 9 and then the undissolved insulating material 2 is deposited on the inner peripheral surface 83c of the outer peripheral portion 83 'of the conductive container 83 and the inner fin 83d. It moves under its own weight so as to come into contact with it and is continuously dissolved.

When the conductive material is heated by high-frequency induction heating, if the conductive material closest to the high-frequency induction coil is connected in a circumferential shape, an induced current flows through the portion, and the portion is heated. Although there is a principle that the material inside of the conductive container 83 does not flow because the induced current is shielded and cannot be directly heated, in the present embodiment, the central protruding portion 13 of the conductive container 83 is located behind the outer peripheral portion 83 '. Is high, the outer peripheral portion 8
In addition to 3 ′ and the inner fin 83d, the upper portion of the central projection 13 is subjected to high-frequency induction heating, so that the insulating material 2 in contact with this portion is also heated and melted.
Are the inner peripheral surface 83c, the inner fin 83d, and the central projection 1
The heating contact area increases due to the upper part of 3, and the dissolution becomes faster,
The heat dissolution effect is improved.

The insulating material 2 is melted and flows down from the hole 9, and the undissolved insulating material 2 is removed from the conductive container 8.
3 moves closer to the inner peripheral surface 82c and comes into contact with the inner peripheral surface 83c and the inner fin 83d.

For this reason, if the side surface 13b of the central projection 13 forms a slope approaching the inner peripheral surface 83c of the conductive container 83 from top to bottom, the insulating material 2 can more effectively serve as the inner peripheral surface 83c. And move to the inner fin 83d side, which is preferable.

A third experimental example according to the third embodiment will be described below.

The furnace body 4a of the high-frequency induction heating and melting apparatus 43
A furnace having an inner diameter of 200 mm and a depth of 300 mm was used, and a container made of SUS304 was installed therein as the conductive container 83. SUS304 container is 180mm in outside diameter and 5m in thickness
m, height 120mm, center protrusion 150mm in height, height 180mm, center diameter 100mm in upper part, center protrusion with spherical top surface and inner 5mm in thickness and 8mm in width on the inner circumference of outer circumference Fins were provided. The bottom of the SUS container has a diameter of 8
Eight mm holes were concentrically arranged.

This container was heated to 1300 ° C. by high-frequency induction, and a cotton-like insulating material of a composite oxide composed of Al ₂ O ₃ —SiO ₂ —MgO—CaO was charged from above. The inserted heat insulator is melted by touching the inner projections and inner fins of the central projection and the outer periphery of the SUS304 container, flows out from the hole, and the thermal insulator near the central projection collapses under its own weight and is made of SUS304. Move to the inner peripheral surface side of the outer peripheral part of the container,
Dissolved continuously one after another. The dissolution continued in the same manner even when the heat insulator was thrown in from the top one after another, and the time required for dissolving 10 kg of the heat insulator was 50 minutes.

As shown in the third experimental example, according to the high frequency induction heating and melting apparatus for insulating material of the present embodiment,
It was possible to continuously dissolve the material without adding mechanical stirring by merely charging the insulating material one after another.

Referring to FIG. 4, a high-frequency induction heating and melting apparatus for an insulating material according to a fourth embodiment of the present invention will be described. FIG. 4A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment, and FIG.
FIG.

As shown in FIG. 4, in the present embodiment, a conductive container 84 made of a conductive material in a shape conforming to the inner peripheral surface thereof is placed in the furnace main body 4a of the high-frequency induction heating and melting apparatus 44. Is arranged.

At the center of the bottom of the conductive container 84, an upwardly projecting central projection 14 is integrally formed. The shape of the central projection 14 is the same as that of the third embodiment described above. And a shape that is taller than the outer peripheral portion 84 ′ of the conductive container 84, and the top portion 14 a of the central projection 14 is the outer peripheral portion 84 ′.
Protruding above.

In the present embodiment, the central projection 14
In addition, a plurality (eight in FIG. 4) of conductive outer peripheral fins 14c are vertically oriented on the lower side surface 14b from the top portion 14a and project toward the inner peripheral surface 84c of the outer peripheral portion 84 'of the conductive container 84. And are integrally formed or attached. The outer peripheral fin 14c has the central projection 1
4 and the same material as the conductive container 84.

An inner fin 84d similar to that of the third embodiment is provided on an inner peripheral surface 84c of an outer peripheral portion 84 'of the conductive container 84, and a hole 9 is formed in the inner fin 84d of the bottom surface 84b. It is provided at the dodging position.

It is preferable that the side surface 14b of the central projection 14 has a slope approaching the inner peripheral surface 84c of the conductive container 84 from top to bottom.

In the high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment described above, the central projection 14 that is taller than the outer peripheral portion 84 ′ of the conductive container 84 is provided at the center of the conductive container 84. By providing the inner fin 84d on the inner peripheral surface 84c of the portion 84 'and the outer peripheral fin 14c on the side surface 14b of the central projection 14, when the conductive container 84 is subjected to high-frequency induction heating, the upper portion of the central projection and the outer fin 14c are formed. Since the high-frequency induction heating is performed, the insulating material 2 that is in contact with this portion and the insulating material 2 that is in contact with the inner peripheral surface 84c of the outer peripheral portion 84 'of the conductive container 84 and the inner fin 84d are melted and removed. After flowing down through the hole 9, the undissolved insulating material 2 is removed by the inner peripheral surface 84 c of the outer peripheral portion 84 ′ of the conductive container 84 and the inner fin 84.
d and the outer peripheral fins 14c provided on the central projections 14 are moved by their own weight so as to come into contact therewith, and melting is performed continuously.

When the conductive material is heated by high-frequency induction heating, if the conductive material closest to the high-frequency induction coil is connected in a circumferential shape, an induced current flows through the portion, and the portion is heated. Although there is a principle that the material inside of the conductive container 84 does not flow because the induced current is shielded and cannot be directly heated, in the present embodiment, the central projection 14 of the conductive container 84 is located behind the outer peripheral portion 84 '. Is high, the outer peripheral portion 8
4 ′ and the inner fin 84d, the upper part of the central projection 14 and the outer fin 14c are subjected to high-frequency induction heating.
The insulating material 2 in contact with this portion is also heated and melted, and as a result, the insulating material 2 is
4d, the upper portion of the central projection 14, and the outer peripheral fin 14c increase the heating contact area, thereby increasing the melting speed and improving the heat melting effect.

The insulating material 2 melts and flows down from the hole 9, and the undissolved insulating material 2 is removed from the conductive container 84.
Move to the vicinity of the inner peripheral surface 84c and come into contact with the inner peripheral surface 84c and the inner fin 84d.

Therefore, when the side surface 14b of the central projection 14 is inclined from the top to the bottom and approaches the inner peripheral surface 84c of the conductive container 84, the insulating material 2 can more effectively serve as the inner peripheral surface 84c. It is easy to move to the inner fin 84d side, which is preferable.

A fourth experimental example according to the fourth embodiment will be described below.

The furnace body 4a of the high-frequency induction heating and melting apparatus 44
A furnace having an inner diameter of 200 mm and a depth of 300 mm was used, and a container made of SUS304 was installed therein as the conductive container 84. SUS304 container is 180mm in outside diameter and 5m in thickness
m, height 120mm, center protrusion 150mm in height, height 180mm, center diameter 100mm in upper part, top surface is spherical, and thickness 5mm, length 60mm on side surface of outer periphery
5mm thickness on the inner peripheral surface of the outer peripheral part
An inner fin having a width of 8 mm and a length of 100 mm was provided. Eight holes with a diameter of 8 mm were arranged concentrically at the bottom of the SUS container.

This container was heated to 1300 ° C. by high frequency induction, and a cotton-like insulating material of a composite oxide composed of Al ₂ O ₃ —SiO ₂ —MgO—CaO was charged from above. The inserted heat insulating material touches the inner peripheral surface of the central projection and the outer peripheral portion of the SUS304 container and the outer fins and inner fins provided thereon, melts and flows down through the hole 9, and flows out near the central projection. Heat insulation material collapses under its own weight and SU
It moved to the inner peripheral surface side of the outer peripheral part of the container made of S304, and was continuously and continuously dissolved. The dissolution continued in the same manner even when the heat insulating material was thrown in one after another from the top, and the time required for dissolving 10 kg of the heat insulating material was 45 minutes.

As shown in the fourth experimental example, according to the high frequency induction heating and melting apparatus for insulating material of the present embodiment,
It was possible to continuously dissolve the material without adding mechanical stirring by merely charging the insulating material one after another.

Referring to FIG. 5, a high-frequency induction heating and melting apparatus for an insulating material according to a fifth embodiment of the present invention will be described. FIG. 5A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment, and FIG.
It is an E arrow top view.

As shown in FIG. 5, in the present embodiment, a conductive vessel 85 made of a conductive material in a furnace body 4a of a high-frequency induction heating and melting apparatus 45 in a shape conforming to the inner peripheral surface thereof. Is arranged.

At the center of the bottom of the conductive container 85, an upwardly projecting central projection 15 is integrally formed. The shape of the central projection 15 is the same as that of the third embodiment described above. The top 15a of the central protruding portion 15 has a shape that is taller than the outer peripheral portion 85 'of the conductive container 85.
Protruding above.

In this embodiment, the central projection 15
Has a spiral groove 15d on the surface from the top 15a to the side surface 15b.

The inner peripheral surface 85c of the outer peripheral portion 85 'of the conductive container 85 is provided with an inner fin 85d similar to that of the third embodiment described above, and the hole 9 is formed with the inner fin 85d of the bottom surface 85b. It is provided at the dodging position.

It is preferable that the side surface 15b of the central projection 15 has a slope approaching the inner peripheral surface 85c of the conductive container 85 from top to bottom.

In the high-frequency induction heating and melting apparatus for an insulating material according to the present embodiment described above, a central projection 15 that is taller than the outer peripheral portion 85 ′ of the conductive container 85 is provided at the center of the conductive container 85. A spiral groove 15d is provided on the surface of the projection 15, and an inner peripheral surface 85 'of the outer peripheral portion 85' is provided.
By providing the inner fins 85d on the upper portion c, when the conductive container 85 is subjected to high-frequency induction heating, the upper portion of the central projection 15 is subjected to high-frequency induction heating, so that the insulating material in contact with this portion and the spiral groove 15d is provided. 2, and the insulating material 2 which is in contact with the inner peripheral surface 85c of the outer peripheral portion 85 'of the conductive container and the inner fin 85d is melted and flows down through the hole 9, and thereafter the undissolved insulating material 2 is removed. The conductive container 85 is moved by its own weight so as to come into contact with the inner peripheral surface 85c of the outer peripheral portion 85 'of the conductive container 85 and the inner fin 85d, and the melting is performed continuously.

When the conductive material is heated by high-frequency induction heating and the conductive material closest to the high-frequency induction coil is connected in a cylindrical shape, an induced current flows through that portion, and the portion is heated. Although there is a principle that the induced current is not shielded and flows through the inner material, the material cannot be directly heated. However, in the present embodiment, the central projection 15 of the conductive container 85 is shorter than the outer peripheral portion 85 '. Because of the high
In addition to the 5 ′ and the inner fin 85d, the upper part of the central protrusion 15 and the spiral groove 15d are subjected to high-frequency induction heating, so that the insulating material 2 in contact with this portion is also heated and melted. Due to the inner peripheral surface 85c, the inner fin 85d, the upper part of the central projection 15 and the spiral groove 15d, the heating contact area increases, the melting speed is increased, and the heat melting effect is improved.

The insulating material 2 melts and flows down from the hole 9, and the undissolved insulating material 2 is removed from the conductive container 8.
5 moves closer to the inner peripheral surface 85c and comes into contact with the inner peripheral surface 85c and the inner fin 85d.

Therefore, if the side surface 15b of the central projection 15 is inclined from the upper side to the lower side and approaches the inner peripheral surface 85c of the conductive container 85, the insulating material 2 can more effectively serve as the inner peripheral surface 85c. This makes it easier to move to the inner fin 85d side, which is preferable.

In this embodiment, the central projection 1
5 is provided with a spiral groove 15d,
The groove provided on the side surface 15b of the central protruding portion 15 is not necessarily limited to a spiral shape, but may be a linear groove as long as it goes from top to bottom. What is necessary is just to increase it.

A fifth experimental example according to the fifth embodiment will be described below.

The furnace body 4a of the high-frequency induction heating and melting device 45
A furnace having an inner diameter of 200 mm and a depth of 300 mm was used, and a container made of SUS304 was installed therein as the conductive container 85. SUS304 container is 180mm in outside diameter and 5m in thickness
m, a height of 120 mm, a central projection having a central portion having a lower diameter of 150 mm, a height of 180 mm, an upper diameter of 100 mm and a spherical top surface, and a width of 5 mm and a depth of 2 on the outer periphery of the central projection.
An inner fin having a thickness of 5 mm and a width of 8 mm was provided on the inner peripheral surface of the spiral groove of mm and the outer peripheral member. Also, SU
Eight holes having a diameter of 8 mm were concentrically arranged at the bottom of the S container.

This container was heated to 1300 ° C. by high-frequency induction, and a cotton-like insulating material of a composite oxide composed of Al ₂ O ₃ —SiO ₂ —MgO—CaO was charged from above. The inserted heat insulating material is melted by touching the central projection of the SUS304 container, the spiral groove provided in the central projection, the inner peripheral surface of the outer peripheral portion and the inner fin, and flows down through the hole, and flows out from the central projection. The nearby heat insulator collapses under its own weight and is SUS30
It moved to the inner peripheral surface side of the outer peripheral part of the container made of 4, and melted continuously one after another. The dissolution continued in the same manner even when the heat insulating material was thrown in one after another from the top, and the time required for dissolving 10 kg of the heat insulating material was 45 minutes.

As shown in the fifth experimental example, according to the high frequency induction heating and melting apparatus for insulating material of the present embodiment,
It was possible to continuously dissolve the material without adding mechanical stirring by merely charging the insulating material one after another.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above-described embodiments, and various changes may be made to the specific structure within the scope of the present invention. .

For example, the inner fins 83d, 84d, 85 in any of the above-described third to fifth embodiments may depend on the conditions such as the shape and dimensions of the conductive container.
The induction heating at the outer peripheral portions 83 ', 84', and 85 'may be performed on the inner peripheral surfaces 83c, 84c, and 85c without providing d.

[0103]

(1) According to the first aspect of the present invention, a high-frequency induction heating and melting apparatus for an insulating material is provided with a high-frequency induction coil provided outside a furnace body, and a conductive material is provided inside the furnace body. A high-frequency induction heating and melting apparatus for an insulating material provided with a conductive container having a hole for the insulating material melted at the bottom with the upper being an inlet for the insulating material, wherein the conductive container is directed upward at the center of the bottom. Since the convex central projection is formed, the undissolved insulating material is located near the inner peripheral surface of the outer peripheral portion of the conductive container, so it is easy to receive heat from the inner peripheral surface, and with melting The heat insulating material near the central protrusion collapses due to its own weight and moves to the inner peripheral surface side, making it easier to contact the inner peripheral surface side, continuous melting is performed, and mechanical stirring is performed only by throwing in insulating material one after another Continuous dissolution without the need for It made.

(2) According to the second aspect of the present invention, in the high frequency induction heating and melting apparatus for an insulating material according to the first aspect, the central projection is taller than the outer peripheral portion of the conductive container. Since it is configured to have a shape, in addition to the effect of the invention of claim 1, since the upper portion of the central protrusion receives high-frequency induction heating and heats the insulating material, the heating contact area of the insulating material increases, The heat melting effect is improved.

(3) According to the invention of claim 3, claim 2
In the high-frequency induction heating melting apparatus of the insulating material according to the
The configuration according to claim 2, wherein the conductive outer peripheral fins are arranged so as to be vertically oriented on the side surface of the central projection and protrude toward the outer peripheral portion of the conductive container. In addition, since the outer peripheral fin of the central protrusion receives the high-frequency induction heating to heat the insulating material, the heating contact area of the insulating material is increased, and the heat melting effect is improved.

(4) According to the invention of claim 4, claim 2
In the high-frequency induction heating melting apparatus of the insulating material according to the
Since the groove formed from the top to the bottom is provided on the side surface of the central projection, in addition to the effect of the invention of claim 2, the groove of the central projection subjected to high-frequency induction heating has The heating contact area of the insulating material is increased, and the heat melting effect is improved.

(5) According to the fifth aspect of the present invention, the first aspect
5. The high-frequency induction heating and melting apparatus for an insulating material according to claim 4, wherein a conductive inner fin is vertically oriented on an inner peripheral surface of an outer peripheral portion of the conductive container and projects toward the center of the conductive container. The inner fin on the inner peripheral surface of the outer peripheral portion of the conductive container is insulated by high frequency induction heating in addition to the effect of any one of the first to fourth aspects of the present invention. Since the material is heated, the heating contact area of the insulating material is increased, and the heat melting effect is improved.

(6) According to claim 6 of the present invention, claim 1
In the high-frequency induction heating and melting apparatus for insulating material according to claim 5, the side surface of the central projection is configured so as to form a slope approaching the inner peripheral surface of the conductive container from top to bottom. In addition to the effects of any one of the first to fifth aspects of the present invention, the insulating material is further easily moved to the inner peripheral surface side, and the effect of heating and melting is improved.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to a first embodiment of the present invention;
(B) is an AA plan view in (a).

FIG. 2A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to a second embodiment of the present invention;
(B) is a plan view taken along the arrow BB in (a).

FIG. 3A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to a third embodiment of the present invention;
(B) is a plan view taken along the line CC in (a).

FIG. 4A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to a fourth embodiment of the present invention;
(B) is a plan view taken along the line DD in (a).

FIG. 5A is a schematic cross-sectional view of a high-frequency induction heating and melting apparatus for an insulating material according to a fifth embodiment of the present invention;
(B) is an EE arrow plan view in (a).

FIG. 6 is a schematic sectional view of a main part of an example of a waste treatment plant.

7A is a schematic cross-sectional view of an example of a conventional high-frequency induction heating and melting apparatus for insulating materials, and FIG.
It is an arrow F plan view.

FIG. 8A is a schematic cross-sectional view of another example of the conventional high-frequency induction heating and melting apparatus for insulating materials, and FIG.
FIG.

[Explanation of symbols]

2 Insulating material 4a Furnace main body 5 High frequency induction coil 9 Drilled hole 10 Step 11, 12, 13, 14, 15 Central projection 11a, 13a, 14a, 15a Top 11b, 12b, 13b, 14b, 15b Side surface 14c Outer fin 15d Grooves 41, 42, 43, 44, 45 High-frequency induction heating / melting devices 81, 82, 83, 84, 85 Conductive containers 81 ', 82', 83 ', 84', 85 'Outer peripheral portion 81a Flange portions 81b, 82b, 83b, 84b, 85b Bottom surface 81c, 82c, 83c, 84c, 85c Inner peripheral surface 82d, 83d, 84d, 85d Inner fin

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F27D 11/06 B09B 3/00 303H F-term (Reference) 4D004 AA46 AC04 CA29 CA45 CB04 CB33 4G075 AA37 BB03 CA02 CA25 DA01 EA05 EB01 EB46 FB02 FC07 FC11 4K046 AA01 BA10 CD02 CD13 4K063 AA04 BA13 CA08 FA36 FA43

Claims (6)

[Claims] A high-frequency induction coil is provided outside a furnace main body, and is made of a conductive material inside the furnace main body. A high-frequency induction heating and melting apparatus for an insulating material, comprising a container, wherein the conductive container is formed with a convex central projection at the bottom center in the upward direction. 2. The high-frequency induction heating and melting apparatus for an insulating material according to claim 1, wherein said central projection is taller than an outer peripheral portion of said conductive container. Induction heating melting equipment. 3. The high-frequency induction heating melting apparatus for an insulating material according to claim 2, wherein conductive outer peripheral fins are vertically oriented on side surfaces of the central projection and project toward the outer peripheral portion of the conductive container. A high-frequency induction heating and melting apparatus for an insulating material, characterized in that the apparatus is provided so as to perform the following. 4. The high-frequency induction heating and melting apparatus for an insulating material according to claim 2, wherein a groove formed from the top to the bottom is provided on a side surface of the central projection. High frequency induction heating and melting equipment. 5. The high-frequency induction heating and melting apparatus for an insulating material according to claim 1, wherein a conductive inner fin is vertically oriented on an inner peripheral surface of an outer peripheral portion of the conductive container. A high-frequency induction heating and melting apparatus for insulating material, wherein the apparatus is provided so as to protrude toward the center of the conductive container. 6. The high-frequency induction heating and melting apparatus for an insulating material according to claim 1, wherein a side surface of the central protrusion is formed on an inner peripheral surface of the conductive container from top to bottom. A high-frequency induction heating and melting apparatus for insulating materials, characterized by forming a slope approaching.