JP2578211Y2 - Levitation heating device for metal lump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for levitating a metal lump in the air for high-frequency induction heating.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional levitation heating apparatus 100 of this type. The apparatus 100 is wound in opposite directions so as to have the same vertical line as an axis. It comprises a high-frequency induction heating coil 101 composed of a pair of coil portions 101a and 101b connected in series, and a high-frequency power supply device 102 for supplying a high-frequency current to the coil 101.

[0003] When the metal lump 103 is heated, the metal lump 103 is placed between the coil portions 101a and 101b.
After that, a high-frequency current is supplied to the high-frequency induction heating coil 101 from the high-frequency power supply device 102. Accordingly, an induced current (eddy current) flows on the surface of the metal lump 103 by the action of a magnetic field generated by the high-frequency current flowing through the coil portions 101a and 101b, and this induced current and the coil portion
Electromagnetic forces generated by the magnetic fields 01a and 101b act on the metal lump 103, respectively. Thereby, the metal lump 10
3 is levitated in the air at a position in a space where the electromagnetic force and the weight of the metal lump 103 are balanced, and in this state, high-frequency induction heating is performed.

[0004]

However, in the conventional levitation heating apparatus 100 as described above, the coil 10
Since the directions of the electromagnetic force acting on the metal lump 103 from 1a and 101b are opposite to each other and act in a direction to cancel each other out, it is difficult to stably levitate the air in addition to a small levitation force, and the heating efficiency is very poor. There is a big problem.

The present invention has been made in view of such circumstances, and has as its object to efficiently and stably levitate and heat a metal lump, and to manufacture an extremely inexpensive metal lump. It is an object of the present invention to provide a device for levitation heating of a mass.

[0006]

In order to achieve the above-mentioned object, according to the present invention, an inverted U-shape having a pair of legs facing each other and a curved portion connecting the upper ends of these legs is provided. thereby disposed with a plurality of mutually small distance a pipe member of electrically conductive, and coupling the lower end of the leg portion of the plurality of pipe members to the annular member of electrically conductive and, Tonarigo each other
The plurality of pipe portions in a gap between the pipe members.
Close only the gap between the curved parts at the upper part of the material with brazing material
A pipe assembly is formed by closing the pipe assembly.
The high-frequency induction heating coil so as to surround the periphery <br/> circumference of the leg portion of the plurality of pipe members are arranged to configure the Ssenburi, the high frequency induction legs of the magnetic field frequency current make flowing through heating coil and the pipe member By causing the metal lump to act on the metal lump through the gap therebetween , high-frequency induction heating is performed while the metal lump is levitated in the upper space in the pipe assembly.

[0007]

The magnetic field generated by energizing the high-frequency induction heating coil acts on the metal lump through the gap between the pipe members, and gives a levitation force to the metal lump. In this case, a curved connecting portion of the pipe member is provided at the upper part of the pipe assembly, and the upper part of the pipe member adjacent to each other is provided.
So that only the gap between the curved parts of the
Since you are magnetic flux in the upper portion is to be bent toward the horizontal direction. As a result, the levitation force of the metal lump is increased, and therefore, the metal lump can be efficiently levitated and heated with low power.

[0008]

1 and 4 show an embodiment of the present invention.
This will be described with reference to FIG.

First, before explaining an embodiment of the present invention,
Assumption of the configuration of the levitation heating device according to one embodiment of the present invention
Refer to FIGS. 1 to 3 for the basic configuration and operation
I will explain. The apparatus 1 shown in FIGS. 1 to 3 is used as a heating and melting means in a quenching apparatus, a precision casting apparatus, or the like.

The apparatus 1 comprises a pipe assembly 2, a high-frequency induction heating coil 3 arranged so as to surround the pipe assembly 2, and a high-frequency power supply 4 for supplying a high-frequency current to the coil 3. .

The above-described pipe assembly 2 is formed by integrally combining a plurality of pipe members 5 (having a diameter of, for example, about 6 mm) and an annular member 6 each made of a conductive material such as copper. Each pipe member 5 is formed in an inverted U-shape as shown in FIG. 2, and has a pair of straight legs 5a and 5b facing each other and a curved portion connecting the upper ends of these legs 5a and 5b. 5c. The lower ends of both legs 5a and 5b of the pipe member 5 are connected to the annular member 6, and the pipe member 5 and the annular member 6 are electrically connected.

The pipe members 5 are arranged in parallel with each other, and gaps 7 having a small width (for example, about 1 mm) are provided between the pipe members 5 adjacent to each other. The distance between the two legs 5a, 5b of each pipe member 5 is made different, and the legs 5a, 5b of the plurality of pipe members 5 are disposed so as to be substantially along the same circumference. . Further, the top of the curved portion 5c of the pipe member 5 disposed at the central portion is located at the uppermost position, and the apexes of the curved portions 5c of the pipe member 5 on both sides thereof are gradually reduced, so that the bending of each pipe member 5 The portion 5c is arranged on one hemisphere and has a dome shape as a whole.

The hollow portions 8 of the pipe members 5 are communicated with each other through a passage 9 provided in the annular member 6. Is configured to flow through the passage 9 and the hollow portion 8 and to be discharged from the outlet pipe 11 to the outside.

The high-frequency induction heating coil 3 is formed by spirally winding a copper pipe or the like, and the coil body 3a is connected to the legs 5a and 5b of the pipe member 5 of the pipe assembly 2. It is arranged so as to surround its outer periphery at a slight interval. The coil body 3a and the pipe assembly 2 are arranged so that their axes are the same, and are arranged such that their axes substantially coincide with the vertical line.

The above-mentioned coil main body 3a is configured so that a high-frequency current is supplied from the high-frequency power supply device 4 through the leads 3b and 3c. Cooling water is supplied from outside cooling water supply means.

Next, the operation and action of the high frequency induction heating of the metal lump 13 using the levitation heating apparatus 1 of the present embodiment will be described.

First, the metal lump 13 to be heated is placed on a mounting table (not shown), and the mounting table is raised through the annular member 6 of the pipe assembly 2 so that the metal lump 13 is raised.
Is disposed in an upper portion in the pipe assembly 2, that is, in a region surrounded by the curved portions 5c of the plurality of pipe members 5. Thereafter, a high-frequency current J ₀ is supplied from the high-frequency power supply 4 to the high-frequency induction heating coil 3, and cooling water is supplied to the coil 3 and the pipe assembly 2.

Accordingly, a magnetic field generated by the high-frequency current flowing through the coil 3 acts in the pipe assembly 2 through the gap 7 between the pipe members 5, so that a magnetic flux Φ is generated inside the pipe assembly 2 as shown in FIG. . The magnetic flux Φ acts on the metal lump 13, and a high-frequency induction current Je flows on the surface of the metal lump 13. Then, an interaction between the induced current Je and a magnetic flux Φ (a magnetic flux having a magnetic flux density B) near the surface of the metal lump 13 generates an electromagnetic force F on the surface of the metal lump 13. This electromagnetic force F is proportional to the product of the induced current Je and the magnetic flux density B, and its direction is as shown in FIG. 3 according to Fleming's left-hand rule.

The electromagnetic force F is divided into a force Fc toward the axis of the pipe assembly 2 and a force Fu for floating the metal block 13.
And is divided into Since the buoyancy force Fu is generated over the entire surface of the metal lump 13, the metal lump 13 is levitated in the air. Further, at this time, the metal lump 13 is Joule-heated by the induced current Je flowing on the surface of the metal lump 13 while being levitated in the air.

Next, immediately after the metal lump 13 is levitated in the air as described above, the mounting table is moved to a position away from the pipe assembly 2 by a driving means (not shown), and the metal lump 13 is heated to a predetermined heating temperature ( At this point, the supply of the high-frequency current to the high-frequency induction heating coil 3 is cut off. Accordingly, the electromagnetic force F acting on the metal lump 13 disappears, so that the metal lump 13 is naturally dropped, immersed in quenching cooling water, and subjected to quenching. Alternatively, after the metal block 13 is heated and melted, the spherical molten metal is naturally dropped and cast into a mold.

According to the levitation heating apparatus 1 having the above-described structure, the metal lump 13 can be subjected to high-frequency induction heating in a state of being levitated in the air without contacting other members. This can prevent the material from deteriorating due to a reaction with the member. Furthermore, the metal lump 13 can be stably held in the air in the pipe assembly 2.

Further, according to this embodiment, since the upper portion of the pipe assembly 2 is covered by the curved portions 5c of the plurality of pipe members 5, the electromagnetic force F
Is greatly bent so as to approach the horizontal direction. As a result, the levitation force Fu based on the electromagnetic force F becomes larger. Therefore, the levitation heating of the metal lump 13 can be performed with relatively small electric power,
This is advantageous in terms of efficiency.

Further, when performing levitation heating,
It is conceivable to use a metal cylindrical body having a plurality of slits formed in addition to the pipe assembly 2 as described above. However, manufacturing such a cylindrical body is not easy and is expensive. On the other hand, the pipe assembly 2 of the present example has an economic advantage that it can be manufactured at a low cost by a simple manufacturing operation simply by assembling the pipe material.

Next, the levitation device according to one embodiment of the present invention.
The device 1 will be described with reference to FIG. This device 1
While utilizing all of the basic configuration of the device shown in FIG.
Further, a configuration is adopted in which gaps between the curved portions 5c of the plurality of pipe members 5 are closed with a brazing material 14, such as silver brazing. Note that the curved portions 5 of the two pipe members 5 in the central portion
During the period c, only half of the space is closed by the brazing material 14,
The other half is a slit 20. Thus, overheating of the pipe member 5 is prevented.

In the case of the present embodiment, the pipe assembly 2
The presence of the curved connecting part of the pipe member 5 at the top
In addition, since the structure is such that the lid is completely covered by completely covering the ceiling portion of the pipe assembly 2, the magnetic flux Φ at the upper portion in the pipe assembly 2 is bent more greatly in the direction approaching the horizontal direction. . As a result, a greater levitation force can be obtained, and higher efficiency of levitation heating can be achieved. When performing levitation heating
Consumes more power than simply heating
Due to the required relationship, gold can be efficiently
The ability to levitate the genus mass is extremely heavy in practice.
Although this is an important requirement, this embodiment has
A practical levitation heating device can be provided.

As described above, one embodiment of the present invention has been described.
The present invention is not limited to the embodiments described above, and various modifications and changes are possible based on the technical idea of the present invention. For example, as long as there is a gap between the pipe members 5, the plurality of pipe members 5 may be arranged in any manner.

[0027]

As described above, according to the present invention, a plurality of inverted U-shaped pipe members are arranged with a gap therebetween and adjacent to each other.
Of the upper curved part of the gap between the pipe members
Since the pipe assembly made of brazing material is used only between the portions, the presence of the curved portion at the upper portion of the pipe member and the filter between the curved portions at the upper portion of the pipe member.
Due to the presence of the filler material, the metal lump can be efficiently levitated with relatively small power consumption . Moreover, the above-described pipe assembly brazing material by assembling a plurality of pipe members
The gap can be obtained by a very simple manufacturing operation only by closing the gap, and the cost of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 shows the premise of the configuration of the levitation heating device according to the present invention.
It is a top view which shows the levitation heating apparatus which becomes .

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

A flat <br/> view levitation heating apparatus according to an embodiment of FIG. 4 the present invention.

FIG. 5 is a conceptual diagram of a main part configuration of a conventional levitating heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-floating heating device 2 Pipe assembly 3 High-frequency induction heating coil 4 High-frequency power supply device 5 Pipe member 5a, 5b Leg 5c Curved portion 6 Ring member 7 Gap 13 Metal lump F Electromagnetic force Fu Levitation force

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ identification symbol FI H05B 6/32 H05B 6/32 (58) Investigated field (Int.Cl. ⁶ , DB name) C21D 1/42 C21D 1/10 B22D 23/00 C22B 9/00-9/22 F27B 14/00-14/20 F27D 11/06 H05B 6/32

Claims (1)

(57) [Scope of request for utility model registration] A pair of legs 1. A facing each other, arranged at these legs inverted U-shape to each other small distance a plurality of conductive pipe member having a curved portion, respectively connecting the upper end of while, combines the lower end of the leg portion of the plurality of pipe members to the conductive annular member, and, before adjacent to each other
Of the plurality of pipe members in the gap between the pipe members.
Close only the gap between the upper curved sections with brazing material
A pipe assembly comprising:
A high-frequency induction heating coil is arranged so as to surround the legs of the plurality of pipe members constituting the assembly, and a magnetic field generated by a high-frequency current flowing through the high-frequency induction heating coil is passed through a gap between the legs of the pipe member. A levitation heating apparatus for a metal lump, wherein the metal lump is subjected to high-frequency induction heating in a state where the metal lump is levitated in an upper space in the pipe assembly by acting on the lump.