JP7437762B2 - induction heating roller device - Google Patents

Description

The present invention relates to an induction heating roller device.

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

This cooling structure includes a hollow band spirally provided on the inner peripheral surface of a cylindrical core, and an inlet and an outlet for a cooling medium provided at one end of the cylindrical roller. Specifically, an inlet pipe is connected to one end of the hollow band, an outlet pipe is connected to the other end of the hollow band, and the cooling medium is supplied from the inlet pipe and the coolant is discharged from the outlet pipe. It is the composition.

However, the lead-out piping connected to the other end of the hollow band cannot penetrate the hollow band, so it is shifted to the inner or outer periphery (for example, inside the core) with respect to the hollow band. This may complicate the piping structure or prevent placement due to the relationship with surrounding structures.

Patent No. 3756261

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

That is, the induction heating roller device according to the present invention includes a rotatably supported roller body, a cylindrical core provided inside the roller body, and an induction coil wound around the outer peripheral surface of the cylindrical core. and a cooling pipe welded to the inner peripheral surface of the cylindrical core, the cooling pipe having an outgoing pipe portion spirally wound in the same winding direction along the inner peripheral surface of the cylindrical core. and a return pipe part, the outgoing pipe part and the return pipe part communicate with each other at one end, a cooling medium inlet is formed at the other end of the outgoing pipe part, and the other end of the return pipe part A cooling medium outlet is formed in the cooling medium.

With 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 outgoing pipe section and then flows through the return pipe section connected to the outgoing pipe section. It will be led out from the cooling medium outlet. Here, since both the outgoing pipe part and the returning pipe part are spirally wound in the same winding direction along the inner circumferential surface of the cylindrical core, the cooling pipe is cylindrical from the coolant inlet to the coolant outlet. It can be placed along the inner peripheral surface of the shaped iron core. As a result, the piping structure of the cooling pipe that cools the cylindrical core can be simplified. Further, since the cooling medium can be introduced and taken out in a configuration in which the cooling pipe runs along the inner peripheral surface of the cylindrical core, the space occupied by the cooling pipe can be reduced. Furthermore, since the outgoing pipe part and the incoming pipe part of the cooling pipe are not provided within the thickness of the iron core, it is also possible to prevent a reduction in the cross-sectional area of the iron core.

Some induction heating roller devices are of the cantilever type. Specifically, the roller body has a cylindrical shape with a bottom, 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 connected inside the roller body. The cylindrical iron core further includes a rotating shaft provided along the top thereof, and the cylindrical iron core is configured such that the rotating shaft is inserted therein and is disposed in a hollow between the roller body and the rotating shaft.
In such a cantilever type induction heating roller device, in addition to the rotating shaft being arranged inside the roller body, due to the reduction in the diameter of the roller body, etc., the roller body where the cylindrical iron core is arranged and the rotating shaft are The space in between becomes narrower. In order to suitably cool the cylindrical core disposed in such a narrow space, as in the present invention, an outgoing pipe is wound spirally in the same winding direction along the inner peripheral surface of the cylindrical core. It is desirable to have a configuration having a section and a return pipe section.

Specifically, when the distance between the inner circumferential surface of the cylindrical core and the outer circumferential surface of the rotating shaft is equal to or more than one cooling pipe and less than two, the cooling of the present invention The effect of having a tube configuration is significant.

In order to uniformly cool the cylindrical iron core as a whole in the axial direction, it is desirable that the outbound pipe section and the return pipe section are wound at the same pitch.

Specifically, it is considered that the helical elements of the outbound pipe section and the helical elements of the return pipe section that are adjacent to each other are equidistant from each other. Further, it is conceivable that the helical element of the outgoing pipe section and the helical element of the incoming pipe part are in contact with each other.

According to the present invention configured in this way, the cooling pipe has an outgoing pipe part and a returning pipe part which are spirally wound in the same winding direction along the inner circumferential surface of the cylindrical iron core. The piping structure of the cooling pipe can be simplified.

1 is a cross-sectional view schematically showing the configuration of an induction heating roller device according to an embodiment of the present invention. It is a perspective view of the cooling pipe of the same embodiment. This is a modification of the cooling pipe.

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

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

The roller main body 2 has a cylindrical shape with a bottom, and a rotating shaft 4 is connected to the center of the bottom. This rotation shaft 4 is provided inside the roller body 2 along the rotation center axis of the roller body 2, and is connected to a machine base (not shown) through a bearing 5 such as a rolling bearing on the outside of the roller body 2. It is rotatably supported. By rotatably supporting this rotating shaft 4, the roller body 2 is also rotatably supported. Note that the rotating 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 core 31 is constructed by radially arranging and laminating core steel plates having curved portions. Note that the curved portion has, for example, an involute shape. This cylindrical iron core 31 has the rotating shaft 4 inserted therein, and is arranged in a hollow space between the roller body 2 and the rotating shaft 4 . Further, an AC power source (not shown) is connected to the lead wire L1 of the induction coil 32. Further, the magnetic flux generating mechanism 3 is supported by a flange member 6 fixed to the machine stand.

When an alternating current 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 body 2. This passage generates an induced current in the shell, and the induced current generates Joule heat in the shell. Note that in order to improve temperature uniformity in the shell part, a jacket chamber in which a gas-liquid two-phase heat medium is sealed may be formed in the shell part.

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

Specifically, the cooling pipe 7 is welded to the inner peripheral surface of the cylindrical core 31, and has an outgoing pipe portion 71 and a returning pipe portion spirally wound in the same winding direction along the inner peripheral surface of the cylindrical core 31. It has a tube portion 72. The cooling pipe 7 of this embodiment is configured using a circular pipe, and has one outgoing pipe section 71 and one incoming pipe section 72. Note that the cooling pipe 7 is desirably heat resistant and made of a non-magnetic material, and for example, stainless steel or the like can be used.

In particular, as shown in FIG. 2, the outgoing pipe part 71 and the returning pipe part 72 communicate with each other at one end, and the cooling medium inlet P1 is formed at the other end of the outgoing pipe part 71. A coolant outlet P2 is formed at the other end. Note that the coolant inlet P1 and the coolant outlet P2 are provided on the opening side of the roller body 2, and here, they penetrate through the flange member 6 and are located on the machine stand side.

Further, the outgoing pipe part 71 and the returning pipe part 72 are wound at the same pitch, and the spiral elements of the outgoing pipe part 71 and the spiral elements of the returning pipe part 72 that are adjacent to each other are configured to be equidistant from each other. has been done. Further, the spiral elements of the outgoing pipe portion 71 and the spiral elements of the backward pipe portion 72 are arranged alternately along the axial direction of the roller body 2.

In addition, the cooling pipe 7 of this embodiment is formed by bending one pipe into a U-shape and then spirally to form a single outgoing pipe part 71 and a single returning pipe part 72 that communicate at one end. is configured. A method of welding the cooling pipe 7 configured in this way to the inner circumferential surface of the cylindrical core 31 is to insert a linear filler metal into the gap between the cylindrical core 31 and the cylindrical cooling pipe 7 and weld. This makes it possible to strengthen the welding between the cylindrical core 31 and the cooling pipe 7, and to increase the heat transfer area.

In the induction heating roller device 100 of the present embodiment, the distance W (see FIG. 1) between the inner circumferential surface of the cylindrical core 31 and the outer circumferential surface of the rotating shaft 4 is equal to or more than one cooling pipe 7, and By using the above-mentioned two-strip cooling pipe 7, cooling can be easily achieved between the inner circumferential surface of the cylindrical core 31 and the outer circumferential surface of the rotating shaft 4. A tube 7 can be provided. Furthermore, since the distance between the cooling pipe 7 and the rotating shaft 4 is close, the rotating shaft 4 that is heated by the heat from the roller body 2 can be cooled, and the bearing 5 that rotatably supports the rotating shaft 4 is heated to a high temperature. This can prevent thermal deterioration of the bearing 5.

<2. Effects 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, after the cooling medium flows through the outgoing pipe section 71, the cooling medium flows through the outgoing path pipe section 71. The coolant flows through the return pipe section 72 connected to the pipe section 71 and is led out from the coolant outlet P2. Here, since both the outgoing pipe part 71 and the returning pipe part 72 are spirally wound in the same winding direction along the inner peripheral surface of the cylindrical iron core 31, the cooling pipe 7 is connected to the cooling medium inlet P1. It can be arranged along the inner circumferential surface of the cylindrical core 31 across the outlet P2. As a result, the piping structure of the cooling pipe 7 that cools the cylindrical core 31 can be simplified. Further, since the cooling medium can be introduced and taken out in a configuration in which the cooling pipe 7 is arranged along the inner circumferential surface of the cylindrical iron core 31, the space occupied by the cooling pipe 7 can be reduced. Furthermore, since the outgoing pipe part 71 and the incoming pipe part 72 of the cooling pipe 7 are not provided within the thickness of the iron core 31, a decrease in the cross-sectional area of the iron core 31 can also be prevented.

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

For example, the cooling pipe 7 of the embodiment has a configuration having one outgoing pipe section 71 and one returning pipe section 72, but the cooling pipe section has two or more outgoing pipe sections and two or more returning pipe sections. A configuration having the following may also be used. In this case, the cooling medium inlets for the two or more outgoing pipe sections may be provided independently for each outgoing pipe section, or the cooling medium may be branched from one cooling medium inlet and introduced into the two or more outgoing pipe sections. You may do so. Similarly, the cooling medium outlets of two or more return pipe sections may be provided independently for each return pipe section, or the two or more return pipe sections may be combined and the coolant is led out from one coolant outlet. good.

Further, as shown in FIG. 3, the helical element of the outgoing pipe section 71 and the helical element of the incoming pipe part 72 may be configured to contact each other.

Further, in the above embodiment, the outgoing pipe section 71 and the return pipe section 72 were integrally configured by deforming one pipe, but the spiral pipe that becomes the outgoing pipe section 71 and the return pipe section 72 The outgoing pipe part 71 and the incoming pipe part 72 may be communicated by connecting the spiral pipes at one end thereof using a connecting pipe or the like.

Furthermore, although the cooling pipe in the above embodiment is a circular pipe with a circular cross section, it may be an elliptical pipe with an elliptical cross section or a rectangular pipe with a rectangular cross section.

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

Furthermore, the cylindrical core 31, the induction coil 32, and the cooling pipe 7 may be molded with heat-resistant resin. Specifically, the gaps between the cylindrical core 31, the induction coil 32, and the cooling pipe 7 are impregnated with heat-resistant resin and molded, and the air layer existing in each part is filled with the heat-resistant resin to reduce the overall heat transfer coefficient. When the diameter is increased, there is no gap in the magnetic flux generating mechanism 3, 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 pipe 7.

In addition, in the embodiment described above, an example has been described in which the present invention is applied to a cantilever type induction heat roller device, but it may also be applied to a double support type induction heat roller device. In this case, the roller main body has a cylindrical shell portion and a pair of journal portions provided at both ends of the shell portion. Further, the journal portion includes a flange portion that covers the end opening of the shell portion, and a hollow drive shaft integrally formed with the flange portion. The drive shaft is rotatably supported by the machine base via a bearing such as a rolling bearing, and is configured to be rotated by a driving force applied from the outside, for example, by a motor or the like. The magnetic flux generating mechanism of the embodiment described above is arranged inside this roller body.

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

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

Claims (4)

A rotatably supported roller body,
a cylindrical iron core provided inside the roller body;
an induction coil wound around the outer peripheral surface of the cylindrical core;
a cooling pipe welded to the inner peripheral surface of the cylindrical core,
The cooling pipe has an outgoing pipe part and a returning pipe part that are spirally wound in the same winding direction along the inner circumferential surface of the cylindrical core, and the outgoing pipe part and the returning pipe part are on one end side. A cooling medium inlet is formed at the other end of the outgoing pipe part, and a cooling medium outlet is formed at the other end of the returning pipe part,
In the induction heating roller device , the spiral element of the outgoing pipe section and the spiral element of the return pipe part are in contact with each other . The roller body has a cylindrical shape with a bottom,
The induction heating roller device further includes a rotation shaft connected to a bottom central portion of the roller body and provided inside the roller body along a rotation center axis of the roller body,
The induction heating roller device according to claim 1, wherein the cylindrical core is arranged in a hollow space between the roller body and the rotating shaft, into which the rotating shaft is inserted. The induction heating roller device according to claim 2, wherein the distance between the inner circumferential surface of the cylindrical iron core and the outer circumferential surface of the rotating shaft is at least one length of the cooling pipe and less than two lengths. The induction heating roller device according to any one of claims 1 to 3, wherein the outward pipe section and the return pipe section are wound at the same pitch.