JP2009283159A - Induction heat generating roller device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a head loss of a fluid passage opening formed in a wall thickness of a roller body, and to maintain a cylindrical profile of the roller body without reducing a heat exchange efficiency with the roller body. <P>SOLUTION: The induction heat generating roller device includes the cylindrical roller body 1 and a magnetic flux generating system together with an induction coil 3 located in a hollow space of the roller body 1. The loop-shaped fluid passage openings 1c are formed along a peripheral direction in the wall thickness at both axial ends of the roller body 1, and a plurality of meandered (or spiral) fluid passage openings 1b, communicated with the loop-shaped fluid passage openings 1c at both ends are formed in a peripheral direction of the roller body 1. Temperature of the roller body 1 is controlled by circulating cooling fluid through both of the loop-shaped fluid passage openings 1c and the plurality of fluid passage openings 1b in parallel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an induction heating roller device in which a fluid flow hole is formed in a roller body.

  In some cases, an induction heating roller is used as means for heating the processed material to a predetermined temperature while the processed material such as a resin film is in contact with the roller body and is passed therethrough. In this case, the induction heating roller is suitable for raising the processed object to a predetermined temperature, but cannot remove the heat from the high-temperature processed object and rapidly decrease to the predetermined temperature. Therefore, a fluid flow path through which a fluid (heat medium) flows is formed in the roller body so that the induction heat roller can also perform this heat removal. It has been considered to cool the roller body by passing a cooling fluid through the flow path, thereby adjusting the roller body to a predetermined temperature.

As a means for forming a fluid flow path in the roller body, there is one that forms a spiral heat medium flow hole in the wall thickness of the roller body. Such a single spiral heat medium flow hole has a small hole diameter and a narrow pitch (interval of the spiral holes). As a result, the contact surface between the roller and the heat medium flowing through the thickness of the roller body can be widened, and the efficiency of heat exchange with the roller body can be increased.
JP 2007-107676 A

However, in such a spiral hole, the distance from the end of the roller body to the end increases as the size of the roller body increases, and coupled with the fact that the diameter of the spiral hole is small, head loss (pressure loss) The fluid supply capacity must be increased. In addition, there is a problem that the temperature gradient at the entrance / exit is large, a difference in expansion occurs between the entrance / exit of the roller body, and the cylindrical profile is inferior.

  The problem to be solved by the present invention is to reduce the head loss of the fluid flow hole formed in the wall thickness of the roller body without reducing the heat exchange efficiency with the roller body, and to improve the cylindrical profile of the roller body. Therefore, it is possible to maintain such a problem and to solve such a problem.

The present invention comprises a cylindrical roller body and a magnetic flux generating mechanism having an induction coil disposed in the hollow of the roller body, and heats the roller body by supplying an alternating current to the induction coil. In the induction heating roller device, the annular fluid flow holes along the circumferential direction of the roller body are formed in the wall thickness at both end portions in the axial direction of the roller body, and the annular fluid flow paths on the both sides are formed. A plurality of meandering or spiral fluid flow holes communicating with the holes are formed in the circumferential direction of the roller body, and the cooling fluid is passed through the annular fluid flow holes and the plurality of fluid flow holes. The main feature is that the temperature of the main body is adjusted.

  In the present invention, since a plurality of meandering or spiral fluid flow holes communicating with the annular fluid flow holes on both sides are formed in the circumferential direction of the roller body, the total distance of one fluid flow hole The head loss due to the fluid flow hole can be reduced, the temperature gradient at the entrance and exit of the fluid flow hole is small, and the cylindrical profile of the roller body is also good. Moreover, since the fluid flow hole is meandering or spiraling, the contact surface between the fluid and the roller can be widened, and high heat exchange efficiency with the processed product can be maintained.

The purpose is to reduce the head loss of the fluid flow hole formed in the wall thickness of the roller body without reducing the efficiency of heat exchange with the roller body and to maintain the cylindrical profile of the roller body well. Is formed in the wall thickness at both end portions in the axial direction of the roller body, and an annular fluid flow hole is formed along the circumferential direction of the roller body, and the fluid flow is communicated with the annular fluid flow holes on both sides. This was realized by making the holes meandering or spiraling and forming a plurality of holes in the circumferential direction of the roller body.

  FIG. 1 is a sectional view of an induction heat roller device according to an embodiment of the present invention, and FIG. 2 is a developed plan view of a roller body of the induction heat roller device shown in FIG. 1 and 2, 1 is a roller body, 2 is a journal fixed to the end of the roller body, 3 is an induction coil, 4 is an iron core, 5 is a support rod, 6 is a rotary joint, and 7 is a lead wire for the induction coil. It is. A magnetic flux generation mechanism including the induction coil 3 wound around the iron core 4 is held by the support rod 5 and is disposed in the hollow of the roller body 1. The support rod 5 is supported by the journals via the rotary bearings in the journals 2 on both sides, and is fixed so as not to rotate by a non-illustrated detent.

When an alternating voltage is applied to the induction coil 3 through the lead wire 7, an alternating magnetic flux is generated. The alternating magnetic flux passes through the roller body 1, thereby inducing an induced current in the roller body 1, and the roller body 1 It is heated with Joule heat generated by the induced current. This heating becomes smaller at the center of the induction coil 3 and becomes smaller as it reaches the end, and heating spots are generated in the axial direction of the roller body 1. In order to prevent this heating spot, a jacket chamber 1a extending in the axial direction is provided in the thickness near the outer surface of the roller body 1, and a gas-liquid two-phase heat medium is sealed in the jacket chamber 1a. The liquid phase heat medium in the jacket chamber 1a takes heat at the high temperature portion and vaporizes, and the gas moves to the low temperature portion to release heat and liquefy. That is, the latent heat moves. By this latent heat movement, the temperature of the outer surface with which the processed material in the axial direction of the roller body 1 abuts can be made uniform. The jacket chamber 1a may be formed by forming a plurality of holes extending in the axial direction in the roller body 1 by a drill or the like in the circumferential direction, closing both ends of the plurality of holes, and forming each hole independently. There may be a case where a predetermined number or all of the plurality of holes are communicated with each other at an end portion or an intermediate portion thereof or at an intermediate portion thereof.

In order to adjust the temperature of the roller body 1 such that the roller body 1 is lowered from a high temperature to a predetermined temperature, as shown in FIG. An annular fluid flow hole 1c extending in the circumferential direction of the roller body 1 is formed therein, and meandering fluid flow holes 1b communicating with the annular fluid flow holes 1c on both sides are formed. Such a roller body 1 has a flat nonmagnetic metal plate formed with an annular fluid flow hole 1c and a meandering fluid flow hole 1b, and an opening of the groove is shown in FIG. As shown in b), the metal plate 8 is covered and formed into a cylindrical shape.

Then, one annular fluid flow hole 1c formed in the wall thickness of both end portions in the axial direction of the roller body 1 and a flow hole 2a in one journal 2 communicating with one rotary joint 6 are communicated. In addition, the other annular fluid flow hole 1c formed in the wall thickness of both end portions in the axial direction of the roller body 1 and the flow hole 2a in the other journal 2 communicating with the other rotary joint 6 are communicated. Let That is, the fluid serving as the heat medium supplied from one rotary joint 6 is sent to one annular fluid flow hole 1c via the flow hole 2a in the journal 2, and each of the plurality of meandering fluid flows. It is sent to the other annular fluid flow hole 1 c via the flow hole 1 b and discharged from the other rotary joint via the flow hole 2 a in the other journal 2.

FIG. 3 is a sectional view of an induction heat roller apparatus according to another embodiment of the present invention, and FIG. 4 is a developed plan view of a roller body of the induction heat roller apparatus shown in FIG. In addition, the same code | symbol is attached | subjected to the same part as the Example shown in FIG. 1, and description of the part is abbreviate | omitted. 1 differs from the embodiment shown in FIG. 1 in that a plurality of fluid flow holes 1d1 to 1d3 communicating with annular fluid flow holes 1c formed in the thicknesses of both end portions in the axial direction of the roller body 1 are respectively spiraled. It is the point formed in the shape.

As shown in FIG. 4, such a roller body 1 is formed with holes 1c to be annular fluid flow holes 1c at both ends of a flat metal plate by a drill or the like, and is inclined with respect to the holes 1c. When a plurality of holes 1d1 to 1d3 and a hole 1c that are spaced apart from each other are crossed, a hole having the hole 1c as an end point is formed by a drill or the like, and this is formed into a cylindrical shape. When forming into this cylindrical shape, the holes 1d1, 1d2, and 1d3 communicate with each other, one end communicates with one annular fluid communication hole 1c, and the other end communicates with the other annular fluid communication hole 1c. Three spiral fluid flow holes 1d1 to 1d3 are formed.

Then, one annular fluid flow hole 1c formed in the wall thickness of both end portions in the axial direction of the roller body 1 and a flow hole 2a in one journal 2 communicating with one rotary joint 6 are communicated. In addition, the other annular fluid flow hole 1c formed in the wall thickness of both end portions in the axial direction of the roller body 1 and the flow hole 2a in the other journal 2 communicating with the other rotary joint 6 are communicated. Let That is, the fluid supplied from one rotary joint 6 is sent to one annular fluid flow hole 1c via the flow hole 2a in the journal 2, and a plurality of spiral fluid flow holes 1d1, It is sent to the other annular fluid flow hole 1c via 1d2, 1d3, and discharged from the other rotary joint via the flow hole 2a in the other journal 2.

  As described above, in any of the embodiments, the diameter of the fluid flow hole is reduced to, for example, about 10 mm, and the interval is reduced to about 20 mm, so that the contact surface between the fluid flowing through the thickness of the roller body and the roller can be provided. The heat exchange efficiency with the roller body can be increased. In the embodiment, the number of fluid flow holes is three, but the number of fluid flow holes is arbitrary.

It is sectional drawing of the induction heating roller apparatus which concerns on the Example of this invention. FIG. 2 is a developed plan view of a roller body of the induction heat roller device shown in FIG. 1. It is sectional drawing of the induction heating roller apparatus which concerns on the other Example of this invention. FIG. 4 is a developed plan view of a roller body of the induction heat roller device shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller body 1a Jacket 1b Serpentine fluid flow hole 1c Annular fluid flow hole 1d1, 1d2, 1d3 Spiral fluid flow hole 2 Journal 3 Induction coil 4 Iron core 5 Support rod 6 Rotary joint

Claims (2)

An induction heating roller comprising a cylindrical roller body and a magnetic flux generation mechanism having an induction coil disposed in the hollow of the roller body, wherein the roller body is heated by supplying an alternating current to the induction coil. In the apparatus, annular fluid flow holes along the circumferential direction of the roller body are formed in the wall thickness of both end portions in the axial direction of the roller body, and communicated with the annular fluid flow holes on the both sides. A plurality of serpentine or spiral fluid flow holes are formed in the circumferential direction of the roller body, and a cooling fluid is passed through the annular fluid flow holes and the plurality of fluid flow holes to control the temperature of the roller body. An induction heating roller device characterized by being adjusted. 2. A jacket chamber that encloses a gas-liquid two-phase heat medium extending in the axial direction of the roller body is formed in the circumferential direction of the roller body in the thickness of the roller body. Heat transfer medium flow roller.

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