JP2022013229A - Induction heating roller device - Google Patents

Abstract

To simplify a piping structure of a cooling pipe which cools a cylindrical iron core.SOLUTION: An induction heating roller device comprises: a roller body 2 which is supported in a freely rotatable manner; a cylindrical iron core 31 provided inside of the roller body 2; an induction coil 32 wound around an outer peripheral surface of the cylindrical iron core 31; and a cooling pipe 7 welded to an inner peripheral surface of the cylindrical iron core 31. The cooling pipe 7 includes an outward pipe part 71 and an inward pipe part 72 which are spirally wound along the inner peripheral surface of the cylindrical iron core 31 in the same winding direction as each other. The outward pipe part 71 and the inward pipe part 72 are communicated at one end side, a coolant inlet P1 is formed in the other end of the outward pipe part 71, and a coolant outlet P2 is formed in the other end of the inward pipe part 72.SELECTED DRAWING: Figure 1

Description

The present invention relates to an induction heating roller device.

Conventionally, as shown in Patent Document 1, the induction heating roller device includes a rotatable cylindrical roller and a cylindrical iron core, and an induction coil is wound around the cylindrical iron core and arranged inside the cylindrical roller. There is something I did. This induction heating roller device is provided with a cooling structure for cooling a cylindrical iron core or an induction coil.

This cooling structure is configured by providing a hollow band spirally on the inner peripheral surface of the cylindrical iron core and providing an inlet / outlet for a cooling medium on one end side of the cylindrical roller. Specifically, the introduction pipe is connected to one end of the hollow band body, the outlet pipe is connected to the other end of the hollow band body, the cooling medium is supplied from the introduction pipe, and the cooling medium is discharged from the outlet pipe. It is a composition.

However, since the lead-out pipe connected to the other end of the hollow band cannot penetrate the hollow band, it is arranged so as to shift toward the inner circumference or the outer circumference (for example, inside the iron core) with respect to the hollow band. In some cases, the piping structure may be complicated or it may not be possible to arrange it due to the relationship with the surrounding structure.

Japanese Patent No. 3756261

Therefore, the present invention has been made to solve the above-mentioned problems, and its main object is to simplify the piping structure of the cooling pipe for cooling the cylindrical iron core.

That is, the induction heating roller device according to the present invention has a roller body rotatably supported, a cylindrical iron core provided inside the roller body, and an induction coil wound around the outer peripheral surface of the cylindrical iron core. The cooling pipe is provided with a cooling pipe welded to the inner peripheral surface of the cylindrical iron core, and the cooling pipe is spirally wound in the same winding direction along the inner peripheral surface of the cylindrical iron core. And the return pipe portion, the outward pipe portion and the return pipe portion communicate with each other on one end side, a cooling medium inlet is formed at the other end portion of the outward pipe portion, and the other end portion of the return pipe portion. It is characterized in that a cooling medium outlet is formed in the air.

In such an induction heating roller device, when the cooling medium is introduced into the cooling pipe from the cooling medium inlet, the cooling medium flows through the outward pipe portion and then flows through the return pipe portion connected to the outward pipe portion. It will be derived from the cooling medium outlet. Here, since both the outward pipe portion and the return pipe portion are spirally wound along the inner peripheral surface of the cylindrical iron core in the same winding direction, the cooling pipe is cylindrical from the cooling medium inlet to the cooling medium outlet. It can be placed along the inner peripheral surface of the spiral core. As a result, the piping structure of the cooling pipe for cooling the cylindrical iron core can be simplified. Further, since the cooling medium can be introduced and derived in the configuration in which the cooling pipe is placed along the inner peripheral surface of the cylindrical iron core, the occupied space of the cooling pipe can be reduced. Further, since the outward pipe portion and the return pipe portion of the cooling pipe are not provided within the wall thickness of the iron core, it is possible to prevent a decrease in the cross-sectional area of the iron core.

Some induction heating roller devices are cantilevered. Specifically, the roller body has a bottomed cylindrical shape, and the induction heating roller device is connected to the center of the bottom of the roller body, and the rotation center axis of the roller body is inside the roller body. A rotation shaft provided along the top is further provided, and the cylindrical iron core is configured such that the rotation shaft is inserted inside and is arranged in a hollow space between the roller main body and the rotation shaft.
In such a cantilever type inductive heating roller device, in addition to the rotation shaft being arranged inside the roller body, the roller body and the rotation shaft on which the cylindrical iron core is arranged are arranged due to the reduction in the diameter of the roller body and the like. The space between them becomes narrow. In order to suitably cool the cylindrical iron core arranged in such a narrow space, as in the present invention, the outbound pipes spirally wound in the same winding direction along the inner peripheral surface of the cylindrical iron core. It is desirable to have a configuration having a portion and a return pipe portion.

Specifically, the cooling of the present invention is made when the distance between the inner peripheral surface of the cylindrical iron core and the outer peripheral surface of the rotating shaft is one or more and less than two of the cooling pipes. The effect of the tube configuration is remarkable.

In order to cool the cylindrical iron core uniformly over the axial direction, it is desirable that the outward pipe portion and the return pipe portion are wound at the same pitch.

Specifically, it is considered that the spiral element of the outward pipe portion and the spiral element of the return pipe portion adjacent to each other are equidistant from each other. Further, it is considered that the spiral element of the outward pipe portion and the spiral element of the return pipe portion are in contact with each other.

According to the present invention configured as described above, since the cooling pipe has an outward pipe portion and a return pipe portion spirally wound in the same winding direction along the inner peripheral surface of the cylindrical core, the cylindrical core is provided. The piping structure of the cooling pipe for cooling can be simplified.

It is sectional drawing which shows typically the structure of the induction heating roller apparatus which concerns on one Embodiment of this invention. It is a perspective view of the cooling pipe of the same embodiment. This is a modification of the cooling pipe.

Hereinafter, an embodiment of the induction heating roller device according to the present invention will be described with reference to the drawings.

<1. Device configuration>
The induction heating roller device 100 according to the present embodiment is a so-called cantilever type, and as shown in FIG. 1, includes a roller main body 2 and a magnetic flux generation mechanism 3 provided inside the roller main body 2. There is.

The roller main body 2 has a bottomed cylindrical shape, and a rotation shaft 4 is connected to the central portion of the bottom portion thereof. The rotating shaft 4 is provided inside the roller main body 2 along the rotation center axis of the roller main body 2, and is provided on the machine base (not shown) via a bearing 5 such as a rolling bearing outside the roller main body 2. It is rotatably supported. When the rotating shaft 4 is rotatably supported, the roller body 2 is also rotatably supported. The rotary shaft 4 is rotated by a motor (not shown).

The magnetic flux generation mechanism 3 includes a cylindrical iron core 31 and an induction coil 32 wound around the outer peripheral surface of the cylindrical iron core 31. The cylindrical iron core 31 is formed by arranging and laminating iron core steel plates having curved portions in a radial pattern. The curved portion has, for example, an involute shape. The cylindrical iron core 31 is arranged in a hollow space between the roller main body 2 and the rotation shaft 4 while the rotation shaft 4 is inserted inside. Further, an AC power supply (not shown) is connected to the lead wire L1 of the induction coil 32. Further, the magnetic flux generation mechanism 3 is supported by a flange member 6 fixed to the machine base.

When an AC voltage is applied to the induction coil 32 by such a magnetic flux generation mechanism 3, an alternating magnetic flux is generated, and the alternating magnetic flux passes through the cylindrical portion (shell portion) of the roller main body 2. This passage generates an induced current in the shell portion, and the induced current causes the shell portion to generate heat in Joule. In addition, in order to improve the temperature soaking property in the shell portion, a jacket chamber in which a gas-liquid two-phase heat medium is enclosed may be formed in the shell portion.

The induction heating roller device 100 of the present embodiment is provided inside the roller main body 2 and includes a cooling pipe 7 for cooling the cylindrical iron core 31 and the induction coil 32. A cooling medium such as cooling water is supplied to the cooling pipe 7 from a cooling medium supply source (not shown).

Specifically, the cooling pipe 7 is welded to the inner peripheral surface of the cylindrical iron core 31, and is spirally wound along the inner peripheral surface of the cylindrical iron core 31 in the same winding direction as the outward pipe portion 71 and the return path. It has a pipe portion 72. The cooling pipe 7 of the present embodiment is configured by using a circular pipe, and has one outward pipe portion 71 and one return pipe portion 72. It is desirable that the cooling pipe 7 has heat resistance and is a non-magnetic material, and for example, stainless steel or the like can be used.

Then, as shown in FIG. 2, in particular, the outward pipe portion 71 and the return pipe portion 72 communicate with each other on one end side, and the cooling medium inlet P1 is formed at the other end of the outward pipe portion 71, so that the return pipe portion 72 has a cooling medium inlet P1. A cooling medium outlet P2 is formed at the other end. The cooling medium inlet P1 and the cooling medium outlet P2 are provided on the opening side of the roller main body 2, and here, they are located on the machine base side through the flange member 6.

Further, the outward pipe portion 71 and the return pipe portion 72 are wound at the same pitch, and the spiral elements of the outward pipe portion 71 and the spiral elements of the return pipe portion 72 adjacent to each other are configured to be equidistant from each other. Has been done. Further, the spiral element of the outward pipe portion 71 and the spiral element of the return pipe portion 72 are arranged so as to alternate along the axial direction of the roller main body 2.

The cooling pipe 7 of the present embodiment has one outward pipe portion 71 and one return pipe portion 72 communicating with each other by bending one pipe in a U shape and then bending it in a spiral shape. Is configured. As a method of welding the cooling pipe 7 configured in this way to the inner peripheral surface of the cylindrical iron core 31, a linear filler metal is inserted into the gap between the cylindrical iron core 31 and the circular tubular cooling pipe 7 and welded. As a result, the welding between the cylindrical iron core 31 and the cooling pipe 7 can be strengthened, and the heat transfer area can be increased.

In the induction heating roller device 100 of the present embodiment, the distance W (see FIG. 1) between the inner peripheral surface of the cylindrical iron core 31 and the outer peripheral surface of the rotating shaft 4 is equal to or more than one of the cooling pipes 7. It is configured to be less than two, and by using the cooling pipe 7 having the above-mentioned two-row configuration, cooling can be reasonably performed between the inner peripheral surface of the cylindrical iron core 31 and the outer peripheral surface of the rotation shaft 4. A tube 7 can be provided. Further, since the cooling pipe 7 and the rotating shaft 4 are close to each other, the rotating shaft 4 heated by the heat from the roller main body 2 can be cooled, and the bearing 5 that rotatably supports the rotating shaft 4 has a high temperature. It is possible to prevent the bearing 5 from becoming thermally deteriorated.

<2. Effect of this embodiment>
According to the induction heating roller device 100 according to the present embodiment configured as described above, when the cooling medium is introduced into the cooling pipe 7 from the cooling medium inlet P1, the cooling medium flows through the outbound pipe portion 71 and then the outbound route. It flows through the return pipe portion 72 connected to the pipe portion 71 and is led out from the cooling medium outlet P2. Here, since both the outward pipe portion 71 and the return pipe portion 72 are spirally wound along the inner peripheral surface of the cylindrical iron core 31 in the same winding direction, the cooling pipe 7 is spirally wound from the cooling medium inlet P1 to the cooling medium. It can be arranged along the inner peripheral surface of the cylindrical iron core 31 over the outlet P2. As a result, the piping structure of the cooling pipe 7 for cooling the cylindrical iron core 31 can be simplified. Further, since the cooling medium can be introduced and derived in the configuration in which the cooling pipe 7 is placed along the inner peripheral surface of the cylindrical iron core 31, the occupied space of the cooling pipe 7 can be reduced. Further, since the outward pipe portion 71 and the return pipe portion 72 of the cooling pipe 7 are not provided within the wall thickness of the iron core 31, it is possible to prevent a decrease in the cross-sectional area of the iron core 31.

<3. Other effects of this embodiment>
The present invention is not limited to the above embodiment.

For example, the cooling pipe 7 of the above embodiment has a configuration having one outward pipe portion 71 and one return pipe portion 72, but has two or more outward pipe portions and two or more return pipe portions. It may have a configuration having and. In this case, the cooling medium inlets of the two or more outbound pipes may be provided independently for each of the outbound pipes, or the cooling medium may be introduced into the two or more outbound pipes by branching from one cooling medium inlet. You may. Similarly, the cooling medium outlets of the two or more return pipes may be provided independently for each of the return pipes, or the two or more return pipes may be merged and derived from one cooling medium outlet. good.

Further, as shown in FIG. 3, the spiral element of the outward pipe portion 71 and the spiral element of the return pipe portion 72 may be configured to be in contact with each other.

Further, in the above-described embodiment, the outward pipe portion 71 and the return pipe portion 72 are integrally formed by deforming one pipe, but the spiral pipe and the return pipe portion 72 that become the outward pipe portion 71 are integrally formed. By connecting the spiral pipes to be formed at one end thereof using a connecting pipe or the like, the outward pipe portion 71 and the return pipe portion 72 may be communicated with each other.

Moreover, although the cooling tube of the embodiment is a circular tube having a circular cross section, it may be an elliptical tube having an elliptical cross section or a rectangular tube having a rectangular cross section.

Further, a heat insulating material may be arranged on the outer periphery of the induction coil 32. This heat insulating material blocks heat radiation such as heat radiation and air heat conduction from the roller main body 2 to the induction coil 32, and contributes to lowering the temperature of the induction coil 32.

Further, the cylindrical iron core 31, the induction coil 32 and the cooling pipe 7 may be molded with a heat-resistant resin. Specifically, the gaps between the cylindrical iron core 31, the induction coil 32, and the cooling pipe 7 are impregnated with a heat-resistant resin and molded, and the air layer existing in each part is eliminated by filling with the heat-resistant resin to obtain a total heat transfer coefficient. When the size is increased, the gap portion of the magnetic flux generation mechanism 3 disappears, the thermal resistance is further reduced, and the heat of the cylindrical iron core 31 and the induction coil 32 can be effectively transferred to the cooling medium flowing through the cooling tube 7.

In addition, although the example applied to the cantilever type induction heating roller device has been described in the above embodiment, it may be applied to the double-sided type induction heating roller device. In this case, the roller body has a cylindrical shell portion and a pair of journal portions provided at both ends of the shell portion. Further, the journal portion has a flange portion that covers the end opening of the shell portion and a hollow drive shaft that is integrally formed with the flange portion. The drive shaft is rotatably supported by a machine base via a bearing such as a rolling bearing, and is configured to be rotated by a driving force externally given by, for example, a motor or the like. The magnetic flux generation mechanism of the embodiment is arranged inside the roller body.

In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 ・ ・ ・ Induction heating roller device 2 ・ ・ ・ Roller body 31 ・ ・ ・ Cylindrical iron core 32 ・ ・ ・ Induction coil 4 ・ ・ ・ Rotating shaft 7 ・ ・ ・ Cooling pipe 71 ・ ・ ・ Outward pipe 72 ・ ・ ・Return pipe part P1 ・ ・ ・ Cooling medium inlet P2 ・ ・ ・ Cooling medium outlet

Claims (6)

A roller body that is rotatably supported and
A cylindrical iron core provided inside the roller body and
An induction coil wound around the outer peripheral surface of the cylindrical iron core,
A cooling pipe welded to the inner peripheral surface of the cylindrical iron core is provided.
The cooling pipe has an outward pipe portion and a return pipe portion spirally wound in the same winding direction along the inner peripheral surface of the cylindrical iron core, and the outward pipe portion and the return pipe portion are on one end side. An inductive heat-generating roller device in which a cooling medium inlet is formed at the other end of the outward pipe portion and a cooling medium outlet is formed at the other end of the return pipe portion. The roller body has a bottomed cylindrical shape.
The induction heating roller device is connected to a central portion of the bottom of the roller body, and further includes a rotation shaft provided inside the roller body along the rotation center axis of the roller body.
The induction heating roller device according to claim 1, wherein the cylindrical iron core is arranged in a hollow space between the roller main body and the rotating shaft while the rotating shaft is inserted therein. The induction heating roller device according to claim 2, wherein the distance between the inner peripheral surface of the cylindrical iron core and the outer peripheral surface of the rotating shaft is one or more and less than two of the cooling pipes. The induction heating roller device according to any one of claims 1 to 3, wherein the outward pipe portion and the return pipe portion are wound at the same pitch. The induction heating roller device according to claim 4, wherein the spiral element of the outward pipe portion and the spiral element of the return pipe portion adjacent to each other are equidistant from each other. The induction heating roller device according to claim 4, wherein the spiral element of the outward pipe portion and the spiral element of the return pipe portion are in contact with each other.

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