JP4271342B2 - Induction heating roller device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating induction heating roller device, and more particularly to an induction heating roller device provided with a cooling mechanism for cooling an induction heating mechanism.
[0002]
[Prior art]
As is well known, the induction heating roller device includes an induction heating mechanism including an iron core and an induction coil wound around the inside of a rotating roller body. When the induction coil is excited by an AC power supply, the roller body generates heat by induction due to the alternating magnetic flux generated by the excitation.
[0003]
In this configuration, the induction heat generation mechanism generates heat due to its own iron loss and copper loss, but the amount of heat generation is negligible, but it gradually becomes high due to radiant heat from the heat generating roller body and heat conduction of air. Eventually, the temperature rises to the same or slightly higher temperature than the roller body.
[0004]
When the induction heating mechanism rises to a high temperature as described above, the electric wire constituting the induction coil is oxidized, and the insulating performance of the insulator is lowered, so that it cannot be used for a long time. Not only that, but the temperature becomes extremely high and the temperature of the iron core of the induction heating mechanism approaches the Curie point, the magnetic permeability approaches 1, so that it is difficult to induce the roller body to generate heat.
[0005]
In order to prevent such an increase in temperature of the induction heating mechanism, a plurality of iron core steel plates are radially arranged and laminated as an iron core, and a hollow tube that is in contact with the inner peripheral surface of the iron core is welded. Another configuration has been proposed in which a cooling medium is circulated and the heat of the iron core and thus the heat of the induction coil are absorbed by this cooling medium (see JP-A-10-55881).
[0006]
According to this, the induction coil and the iron core constituting the induction heating mechanism are cooled. In particular, since the core steel plates that make up the iron core are arranged in a radial pattern, there is no large number of inter-layer contact areas in the radial direction unlike when a wound iron core is used. can do.
[0007]
However, according to such a cooling means, since the induction coil is cooled via the iron core, the cooling efficiency is low. In addition, the hollow tube is fixed to the iron core by welding. However, when a long iron core is formed, the distance from the end surface to the welding point becomes long, so that the welding operation becomes extremely difficult. Furthermore, once the hollow tube is fixed, it is difficult to remove it. For example, even if scales such as scale accumulate or damage occurs, maintenance such as cleaning or repairing the inside is performed. It is extremely difficult to do.
[0008]
[Problems to be solved by the invention]
It is an object of the present invention to increase the cooling efficiency of the iron core and the induction coil and to facilitate the installation and maintenance of the hollow tube when the induction heating mechanism is cooled by circulating a cooling medium through the hollow tube. And
[0009]
[Means for Solving the Problems]
The present invention includes a rotatable roller body, a cylindrical iron core, and an induction coil wound around the iron core. The roller body is guided to generate heat. In the induction heating roller device comprising an induction heating mechanism for making the iron core portion, the iron core portion, the iron core steel plate having a bending portion and a bent portion continuous to the bending portion, and the shape of the side walls on both sides are the iron core. A bent portion of the steel plate and a hollow tube that matches a shape of the bent portion continuous to the bent portion, and a plurality of the iron core steel plates and the hollow tube are combined to form the iron core steel plate and the hollow tube. It is characterized in that it is configured by radially arranging and laminating the edge of the bent portion of the side wall with the cylindrical inner peripheral side, and a cooling medium is circulated inside the arrayed and laminated hollow tubes.
[0011]
The iron core portion has a bent portion and a bent portion continuous to the bent portion, and the shape of the side wall on both sides is the bent portion of the iron core steel plate and the bent portion continuous to the bent portion. by combining the hollow tube matching, because it is constructed by arranging stacked radially to the edge of the bent portion of the side wall of the core sheet and the hollow tube on the inner peripheral side cylindrical welding over middle empty tubes full length There is no need for fixing to the iron core. This facilitates the installation and also facilitates maintenance. Even for the hollow tube core steel, and because wider directly abuts against the induction coil, these can efficiently be cooled.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. Reference numeral 1 denotes a roller body, and 2 a journal integrally attached to both sides thereof. The journal is rotatably supported by a machine base 4 via a bearing 3 and is driven to rotate by an arbitrary driving source. Reference numeral 5 denotes an induction heating mechanism, which is composed of a cylindrical iron core 6 and an induction coil 7 wound around the iron core 6.
[0013]
The induction heating mechanism 5 is supported inside the roller body 1 by support rods 8 on both sides thereof. The support rod 8 is inserted into the journal 2 in a state where the rotation is restricted, and is supported by the journal 2 via a bearing 9. The induction coil 7 is connected to a lead wire 10, and the lead wire 10 is led out through the support rod 8. It is connected to an external AC power source. Reference numeral 11 denotes a jacket chamber provided inside the peripheral wall of the roller body 1, and a gas-liquid two-phase heat medium is sealed inside.
[0014]
As shown in FIG. 2, the iron core 6 is configured by radially arranging and laminating a plurality of iron core steel plates 12. The iron core steel plate 12 shown here is composed of, for example, a bent portion 13 bent in an involute curve shape, and a bent portion 14 continuous to the bent portion 13. The iron core steel plate 12 is connected to the bent portion 14. The end edges are arranged and laminated radially on the inner circumference of the cylinder, and the end edges of the bent portion 13 are arranged along the outer circumference of the cylinder.
[0015]
And the iron core 6 is comprised so that the space 15 extended along the axial center direction of the iron core 6 may interpose in the laminated part of this iron core steel plate 12. As shown in FIG. In principle, a long gutter 18 comprising a side wall 16 having the same shape as the iron core steel plate 12 and a bottom wall 17 is prepared, and this gutter 18 is interposed in the laminated portion of the iron core steel plate 12 to provide a void. 15 may be formed. Specifically, as shown in FIG. 3, a long hollow tube 20 having a side wall having the same shape as the iron core steel plate 12 is prepared, and the hollow tube 20 is interposed in the laminated portion of the iron core steel plate 12. Thus, a void 15 is formed.
[0016]
As shown in FIG. 4, the tube portion of the hollow tube 20 includes a pair of straight tube main bodies 21 connected at the tip by a U-shaped connecting portion, and one end of the tube main body 21 via a connecting tube 22. And a discharge pipe 25 connected to the other end of the pipe main body 21 via a connecting pipe 24.
[0017]
The pipe body 21 is inserted into the space 15 of the iron core 6 and arranged. The supply pipe body 23 and the discharge pipe body 25 pass through the inside of the support rod 8 and are led out from the end portions thereof. Actually, the tube main body 21 is inserted into the void 15 and the supply tube 23 and the discharge tube 25 are inserted into the support rod 8, and then the tube main body 21, the supply tube 23, and the discharge tube are inserted. 25 may be connected to each other by the connecting pipe bodies 22 and 24.
[0018]
In the above configuration, when the roller body 1 is driven to rotate and the induction coil 7 is excited by an AC power source, the roller body 1 generates induction heat. At this time, when a cooling medium such as cooling water is supplied from the supply pipe body 23, it is discharged from the discharge pipe body 25 via the pipe body 21. In this process, the iron core 6 and the induction coil 7 are cooled. Thereby, the heat of the iron core 6 or the induction coil 7 in a high temperature state is absorbed by the cooling medium, and the temperature rise is prevented.
[0019]
In this case, since the pipe body 21 faces the iron core 6 and the induction coil 7,
These can be efficiently cooled.
[0020]
Moreover, since the entire outer periphery of the hollow tube 20 can be brought into direct contact with the iron core steel plate 12 and the induction coil 7, these can be cooled more efficiently.
[0026]
In the above embodiment, the tube main body 21 of the hollow tube 20 is bent so as to make a U-turn in the space 15, but is not limited to this, and when there are a plurality of the spaces 15 As shown in FIG. 5, one tube body 21 of the hollow tube 20 may be inserted into one space 15, and the other tube body 21 may be inserted into the other space 15. In this case, as shown in FIG. 5, both pipe main bodies 21 are connected by a connecting pipe 43 outside the iron core 6. Reference numeral 44 denotes the joint device.
[0027]
【The invention's effect】
As described above, according to the present invention, in order to provide a hollow tube to which a cooling medium is supplied for cooling the iron core and induction coil arranged inside the roller body, the iron core steel plates are arranged radially. Since it is installed by being inserted into the laminated part of the laminated iron core or the gap between the iron core and the induction coil, the iron core and induction coil can be cooled directly, and the hollow tube Is inserted through the laminated portion or the gap, so that the installation and maintenance thereof are extremely easy compared to the conventional structure fixed by welding or the like.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a perspective view of the iron core shown in FIG.
FIG. 3 is a partial longitudinal sectional view when a hollow tube is used.
FIG. 4 is a perspective view of a hollow tube main body.
FIG. 5 is a cross-sectional view showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roller body 5 Induction heating mechanism 6 Iron core 7 Inductive coil 12 Iron core steel plate 15 Space 20 Hollow tube 21 Tube body 41 Air gap

Claims (1)

A rotatable roller main body, and is arranged inside the roller main body, and is composed of a cylindrical iron core and an induction coil wound around the iron core, and is used for induction heating of the roller main body. In the induction heating roller device provided with a heat generating mechanism, the iron core portion has a bent portion and a bent steel portion having a bent portion continuous to the bent portion, and the shape of the side walls on both sides is the bent shape of the iron core steel plate. And a hollow tube that matches the shape of the bent portion continuous to the bent portion, and a plurality of the iron core steel plates and the hollow tube are combined to bend the side walls of the iron core steel plate and the hollow tube. An induction heating roller device in which the end edges of the hollow tubes are radially arranged and laminated with a cylindrical inner peripheral side, and a cooling medium is circulated through the hollow tubes arranged and laminated .

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