JP2001326062A - Induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain deterioration of a copper pipe forming a solenoid coil by reducing local heat generation, and to increase heating capacity. SOLUTION: The induction heating device comprises the first copper plate members 20 formed in the shape of a picture frame parallel to a winding area of a solenoid coil 13 arranged at the outermost side of both end part of iron- cores 19, the second copper plate members 23 arranged with a prescribed distance from the first copper plate member formed in the shape of picture frame which has at least one cut part on the circumference parallel to the winding area of the solenoid coil 13, and an iron-core member 25 formed by laminating plate-shaped magnetic members and arranged at the inner space between both copper plate members 20, 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in the middle of a transfer line such as a hot rolling line for steel,
The present invention relates to an induction heating device that continuously heats a conveyed heated member.

[0002]

2. Description of the Related Art FIG.
FIG. 10 is a sectional side view showing the configuration of a conventional induction heating apparatus of this type shown in Japanese Patent Application Publication No. H10-209, FIG. 10 is a front view showing the induction heating apparatus in FIG. 9, and FIG. 11 is a distribution of magnetic flux at the end of the iron core in FIG. FIG. 12 is a side view showing the state, and FIG. 12 is a perspective view showing the state of distribution of magnetic flux at the end of the iron core in FIG.

In the drawing, reference numeral 1 denotes a steel strip as a member to be heated which is roughly rolled by a preceding rough rolling mill and conveyed by a table roller 2 in a hot rolling line for steel, for example.
Is a solenoid coil formed by winding a copper tube in an oval shape so as to go around the width direction of the steel strip 1, and a high frequency current is supplied from a power supply device (not shown) through a coil terminal portion 4. It is being supplied. 5 is a coil support base for supporting the solenoid coil 3, 6 is disposed inside the solenoid coil 3, and is a heat-resistant member that forms a passage 7 of the steel strip 1, 8 is a magnetic path outside the solenoid coil 3,
A plurality of U-shaped iron cores arranged side by side in the width direction of the steel strip 1, 9
Is a shielded copper plate member for preventing the magnetic flux 10 of the solenoid coil 3 from leaking outside.

Generally, a steel strip 1 as a plate-shaped member to be heated which has been roughly rolled is dissipated by heat while being conveyed by a table roller 2 and sent to the next step, and its temperature decreases. And
Arrange the induction heating device configured as above on the way,
By passing the steel strip 1 through a passage 7 formed inside the solenoid coil 3, the steel strip 1 is induction-heated to compensate for a temperature drop during conveyance.

When a high-frequency current flows through the solenoid coil 3, an alternating magnetic flux 10 is generated along the conveying direction of the steel strip 1 and the steel strip 1 is heated. At this time, if the magnetic flux 10 leaks to the outside, The table roller 2 is heated by the leakage magnetic flux, and a spark may be generated at the contact position between the steel strip 1 and the table roller 2. Therefore, the core 8 and the shield copper plate member 9 block the leakage of the magnetic flux 10 to the outside. , Preventing sparks from occurring. Furthermore,
As is clear from the figure, the reason why the iron core 8 has a U-shape is that the flow of the magnetic flux 10 is changed as shown in FIG. 11 so that the flux linkage to the copper tube forming the solenoid coil 3 is reduced. The purpose is to reduce induction heating of the copper tube itself to prevent overheating.

[0006]

As described above, the conventional induction heating apparatus is provided with the iron core 8 and the shielded copper plate member 9 to prevent the magnetic flux 10 from leaking to the outside, thereby preventing the generation of sparks. Further, by making the iron core 8 have a U-shape, the flux linkage to the copper tube forming the iron core 8 is reduced to prevent the copper tube itself from overheating. However, since the plurality of iron cores 8 are arranged side by side in the width direction of the steel strip 1, the magnetic flux 10 is concentrated at the position of the iron core 8 as shown in FIG. The magnetic flux 10 linked to the tube is greater at a portion corresponding to the iron core 8 than at a portion without the iron core 8, and local heat is increased at this portion. For this reason, there is a problem that the effect of reducing the induction heating due to the U-shaped iron core 8 cannot be exhibited.

[0007] This problem becomes more remarkable as the ratio of the core 8 to the circumference of the solenoid coil 3 decreases. However, the presence of the coil terminal portion 4 and the coil support base 5 causes the core 8 to move around the solenoid coil 3. Since it is practically difficult to dispose it in the entire area, it is not possible to reduce local heat generation at a portion corresponding to the iron core 8 of the copper tube, and in some cases, water leakage occurs due to deterioration of the copper tube. 3, the current flowing through the induction heating device 3 cannot be increased to increase the heating power density, and the heating capacity per induction heating device cannot be increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an induction heating device capable of increasing a heating capacity by reducing local heat generation of a copper tube forming a solenoid coil. The purpose is to provide.

[0009]

According to a first aspect of the present invention, there is provided an induction heating apparatus comprising: a plurality of members arranged along a magnetic path outside a solenoid coil for induction heating by passing a member to be heated conveyed in a line inward; In the induction heating device in which the iron cores are arranged in parallel, a first copper plate member formed in a frame shape along the winding region of the solenoid coil near the both ends of each iron core and disposed on the outermost side, the solenoid coil A second frame which is formed in a frame shape having at least one cut portion on the circumference along the winding region of the first copper plate member and is provided with a predetermined gap therebetween
And a laminated iron core member formed by laminating a copper plate member and a magnetic plate member and disposed in a gap between the copper plate members.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a side sectional view showing a configuration of an induction heating device according to Embodiment 1 of the present invention, FIG. 2 is a front view showing the induction heating device in FIG. 1, and FIG. 3 is a configuration of a first copper plate member shown in FIG. FIG. 4 is a perspective view showing the configuration of the second copper plate member shown in FIG. 1, FIG. 5 is a perspective view showing the configuration of the second copper plate member different from that in FIG. 4, and FIG. 7 is a perspective view showing the configuration of the laminated core member shown in FIG. 7, FIG. 7 is a sectional view showing the distribution of magnetic flux near the end of the core of the induction heating device shown in FIG. 1, and FIG. 8 is the extreme end of the induction heating device in FIG. It is a figure which shows the surface local maximum heating value of each part of a copper pipe in comparison with the conventional apparatus.

In the drawing, reference numeral 11 denotes a steel strip as a member to be heated which is roughly rolled by a preceding rough rolling mill and conveyed by a table roller 12 in, for example, a hot rolling line for steel, and 13 denotes a width of the steel strip 11. A solenoid coil formed by winding a copper tube in an oval shape so as to go around the direction, and a high-frequency current is supplied from a power supply device 15 through a coil terminal portion 14. Reference numeral 16 denotes a coil support base for supporting the solenoid coil 13, and 17 is disposed inside the solenoid coil 13, and the passage 1 of the steel strip 11 is provided.
8 is a heat-resistant member. The configuration so far is almost the same as the conventional induction heating device.

Numeral 19 denotes a rectangular parallelepiped core arranged in parallel in the width direction of the steel strip 11 along a magnetic path outside the solenoid coil 3, and numeral 20 denotes a notch 21a on one side as shown in FIG.
And a pair of copper plates 21 each having a bent edge 21b bent at 90 ° at both ends of the notch 21a,
Combine the two notches 21a so that they coincide with each other.
The first copper plate member is formed into a frame shape by forming bent edges 21b with each other by fastening the bent edges 21b with, for example, bolts 22 so that the windows 21c at both ends of the heat-resistant member 17 coincide with the passages 18. , And both ends of each iron core 19 are supported at the outer edge.

Reference numeral 23 denotes a second copper plate member in which a window 24a is formed in the center of the copper plate 24 to form a frame as shown in FIG. 4, and a cut portion 24b is formed in at least one place on the periphery thereof. , The window 24a is fitted to the outer periphery of the heat-resistant member 17, and the first
Are arranged inside the copper plate member 20 with a predetermined gap. As shown in FIG. 6, for example, as shown in FIG. 6, a plurality of iron core blocks 26 formed by stacking magnetic plate members such as silicon steel plates are combined to form a window portion 25a to form a framed laminated core. The window portion 25a is fitted to the outer periphery of the heat-resistant member 17, and is mounted in the gap between the first and second copper plate members 20,23.

In the induction heating device according to the first embodiment configured as described above, when a high-frequency current flows from the power supply device 15 to the solenoid coil 13 similarly to the conventional device, the induction heating device moves along the transport direction of the steel strip 11. The alternating magnetic flux 27 is generated and the steel strip 11 is heated. At this time, the flow of the alternating magnetic flux 27 at the end of the device is as shown in FIG. That is, the first copper plate member 20 is formed in a frame shape and electrically connected to the passage 18 through which the steel strip 11 is conveyed.
Since the loop is formed, it has a shielding effect of preventing the magnetic flux 27 from leaking to the outside.
No. 3 does not have a shielding effect of preventing the magnetic flux 27 from leaking to the outside because the cut portion 24b is formed on the frame-shaped periphery and does not electrically form one loop, but the magnetic flux 27 has a second copper plate. Since the penetration of the member 23 itself can be prevented and shielded, most of the magnetic flux 27 flows in the laminated core member 25 to form a magnetic path to the iron core 19, and as shown in FIG. 27 is prevented from interlinking the endmost copper tube. Further, the laminated core member 25 is not interrupted by the coil terminal portion 14 or the coil support base 16 and the solenoid coil 1
Since the magnetic flux 27 is arranged over the entire circumference of the winding region 3, the magnetic flux 27 is not concentrated only on the portion corresponding to the iron core 19, becomes uniform, and the heat generation does not locally increase or decrease.

FIG. 8 shows a copper tube disposed at the end of the solenoid coil in the induction heating device according to the first embodiment configured as described above and the conventional induction heating device described in FIGS. 9 to 12. It is a figure showing the experimental result which compared the maximum temperature rise value of each part. First, width 25mm x height 25m
m, a 3 mm thick square copper tube with a winding dimension of 2000 mm wide
× In the first embodiment, the solenoid coils 3 and 13 formed to have a height of 210 mm have a thickness of 50 mm.
mm, and 300 mm in the width direction of the steel strip 11 transporting the rod-shaped core 19 having a width of 200 mm.
In the conventional example, six U-shaped iron cores 8 having a width of 200 mm are arranged at intervals of 300 mm in the width direction of the steel strip. The flow rate of the cooling water flowing through the copper tube was 2.2 m / sec, and the power supplied to the solenoid coils 3 and 13 was 5000 KW. The temperature measurement site on the copper tube surface, and the vertical axis indicates the maximum temperature rise value at each site.

As is clear from the drawing, while the maximum temperature rise value of each part on the surface of the endmost copper tube in the first embodiment shown by the solid line is almost uniform, the maximum temperature increase in the conventional example shown by the broken line is shown. The temperature rise value is higher in the portion corresponding to the iron core 8 than in the other portions, and particularly, the temperature rise value in the end portion in the width direction is the highest, and is about 30% as compared with the temperature rise value in the first embodiment. The temperature rise value is high.

As described above, according to the first embodiment, the first copper plate member 20 formed in a frame shape along the winding area of the solenoid coil 13, the circumference along the winding area of the solenoid coil 13 Above, at least one cut portion 24b
The two copper plate members 20, 2 formed by laminating a second copper plate member 23 formed in a frame shape having a
3 by disposing the laminated core member 25 disposed between them at the end of the apparatus, so that most of the magnetic flux 27 can be transmitted to the laminated core member 25.
Since it flows through the inside to the iron core 19, local heat generation of the copper tube forming the solenoid coil 13 is reduced, deterioration of the copper tube is suppressed, and the heating capacity can be increased.

In the above configuration, the first copper plate member 20 is formed by combining a pair of copper plates 21. However, the first copper plate member 20 does not necessarily have to be divided, and is formed by a single copper plate. Alternatively, the window portion 24a and the cut portion 24b are formed on a single copper plate 24 to form the second copper plate member 23. However, the second copper plate member 23 is formed in a U-shape as shown in FIG. The window portion 29a and the cut portion 29b may be formed as the second copper plate 29 by combining the two copper plates 28, and the same effect as in the first embodiment can be obtained. .

[0019]

As described above, according to the first aspect of the present invention, a plurality of iron cores are provided along a magnetic path outside a solenoid coil for induction heating by passing a member to be heated conveyed in a line inside. Are arranged in parallel in an induction heating device,
A first copper plate member formed in a frame shape along the winding region of the solenoid coil near both ends of each iron core and disposed at the outermost position, and at least one cut on the circumference along the winding region of the solenoid coil A second copper plate member formed in a frame shape having a portion and disposed with a predetermined gap from the first copper plate member;
And a laminated core member formed by laminating magnetic plate-shaped members and disposed in a gap between both copper plate members, so that local heat generation of a copper tube forming a solenoid coil is reduced and deterioration is suppressed, An induction heating device capable of increasing the heating capacity can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of an induction heating device according to Embodiment 1 of the present invention.

FIG. 2 is a front view showing the induction heating device in FIG.

FIG. 3 is a perspective view showing a configuration of a first copper plate member shown in FIG.

FIG. 4 is a perspective view showing a configuration of a second copper plate member shown in FIG.

5 is a perspective view showing a configuration of a second copper plate member different from that in FIG.

FIG. 6 is a perspective view showing a configuration of a laminated core member shown in FIG. 1;

FIG. 7 is a sectional view showing a distribution state of magnetic flux near an end of an iron core of the induction heating device shown in FIG. 1;

FIG. 8 is a view showing the local maximum temperature rise value of each part of the endmost copper tube of the induction heating apparatus in FIG. 1 in comparison with the conventional apparatus.

FIG. 9 is a side sectional view showing a configuration of a conventional induction heating device.

FIG. 10 is a front view showing the induction heating device in FIG. 9;

FIG. 11 is a side view showing a distribution state of magnetic flux at an end of the iron core in FIG. 9;

FIG. 12 is a perspective view showing a distribution state of magnetic flux at an end of the iron core in FIG. 9;

[Explanation of symbols]

11 steel strip, 13 solenoid coil, 17 heat-resistant member, 18 passage, 19 iron core, 20 first copper plate member,
21, 24, 28 copper plate, 21c, 24a, 25a, 2
9a window portion, 24b, 29b cut portion, 23, 29 second copper plate member, 25 laminated core member, 27 magnetic flux.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Sakamoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Shigefumi Katsura 1 Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Corporation Inside Chiba Works (72) Inventor Toshiaki Amagasa 1 Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Co., Ltd.F-term in Chiba Works (Reference) 4K063 AA08 AA12 BA02 BA16 CA01 CA06 FA32 FA43

Claims (1)

[Claims] 1. An induction heating apparatus in which a plurality of cores are arranged in parallel along a magnetic path outside a solenoid coil for induction heating by passing a member to be heated conveyed inside a line, A first frame is formed in the shape of a frame along the winding area of the solenoid coil and disposed on the outermost side near both ends of the solenoid coil.
A second copper plate member formed in a frame shape having at least one cut portion on the circumference along the winding region of the solenoid coil and disposed with a predetermined gap from the first copper plate member An induction heating apparatus comprising: a copper plate member; and a laminated core member formed by laminating a magnetic plate member and disposed in a gap between the copper plate members.