JP3362071B2 - Induction heating roller device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating roller device. 2. Description of the Related Art An electromagnetic induction heating mechanism provided with an induction coil is installed inside a rotating hollow roller to generate Joule heat on the peripheral wall of the roller by an induced current. An induction heating roller device is provided with a jacket chamber in which a phase heat medium is sealed, and the surface temperature of the roller is equalized by vaporization and condensation of the heat medium.
It is already well known. In such an induction heating roller device,
To configure the jacket chamber, inside the peripheral wall of the roller,
It is known that a plurality of holes extending along the axial direction of the roller are formed in the circumferential direction of the roller, and the holes are used as a jacket chamber. According to such a configuration, even if the roller rotates at a high speed and the heat medium in the liquid phase adheres to the outer peripheral side of the roller due to centrifugal force, it is generated on the inner peripheral side of the roller. Since the heat is conducted to the outer peripheral side, the heat can convert the liquid heat medium attached to the outer peripheral side into a gaseous phase, which is convenient. However, on the other hand, the heat transfer distance along the radial direction of the roller from the hole to the roller surface directly facing the hole, and the distance from the portion between the adjacent holes to the roller surface directly facing the portion. There is a difference with the heat transfer distance along the radial direction of the roller. Based on this difference in heat transfer distance, it is inevitable that a temperature difference will occur between the two due to the difference in thermal resistance, so that the surface of the roller along the circumferential direction has irregularities in the temperature distribution. Become. Further, these holes need to be formed by machining, and the machining is extremely troublesome, especially when the roller is long. In addition, it is necessary to increase the hole diameter by a certain degree or more due to restrictions on machining, and therefore, the thickness of the roller must be increased. Increasing the thickness in this way increases the thickness of the inner peripheral side, which hardly contributes to centrifugal force and external pressure, resulting in an increase in the weight of the roller. If the roller is heavy, the thermal time constant will be large, and the thermal response will be poor. In order to form the jacket chamber, instead of providing a hole in the roller peripheral wall as described above, the roller is formed into a double cylinder by an inner cylinder and an outer cylinder, and a gap is formed between the two cylinders. It is also known that this gap is used as a jacket chamber. According to this, it is not necessary to form a hole for the jacket chamber, and if the thickness of the outer cylinder is uniform, the heat transfer distance from the jacket chamber to the surface of the roller is constant at any portion, No temperature difference occurs along the circumferential direction. However, according to such a configuration, when the roller rotates at a high speed, the heat medium in the liquid phase in the jacket chamber adheres as a liquid film to the inner peripheral side of the outer cylinder due to centrifugal force.
Heat generated in the inner cylinder is less likely to be conducted to the liquid film. As a result, not only does thermal responsiveness decrease, causing control delay, but also high heat must be generated to phase-change the liquid film, and the capacity of the electromagnetic induction heating mechanism installed inside the roller is reduced accordingly. It must be raised. SUMMARY OF THE INVENTION It is an object of the present invention to facilitate uniform temperature in the circumferential direction without increasing the size of the roller, and to reduce the weight and improve the thermal response. With the goal. According to the present invention, a metal plate having a large number of gutter portions closed at both ends is provided inside a roller, and an opening surface of the gutter portion faces an inner peripheral surface of the roller. So that both ends of the gutter and the space between the gutters are fixed to the inner peripheral surface of the roller, and at least one end of the roller is
Header ring with an annular groove along the circumferential direction of the roller.
Each gutter is formed on the roller along its radial direction.
It is characterized in that it communicates with the groove through each formed through hole, and the inside of the gutter portion is used as a jacket chamber, and a gas-liquid two-phase heat medium is sealed therein. When the roller generates heat by electromagnetic induction, the metal plate also generates heat at the same time. The heat medium in the gutter portion is vaporized by this heat, and when the vaporized heat medium adheres to the roller and the low-temperature portion of the metal plate, it condenses there and releases heat. This heat raises the temperature of the low temperature part. The heat of condensation at the roller is transmitted to the roller as it is, and the heat of condensation at the metal plate is transmitted to the roller via a fixed portion between the metal plate and the roller. An embodiment of the present invention will be described with reference to the drawings. FIG.
, 1 is a cylindrical roller having one end closed and the other end opened , 24 is a drive shaft, and 25 is fixed by being attached to a machine base.
One end of the drive shaft 24 is closed by the roller 1
Fixed to the end, the other end is rotated by the bearing of the bearing box 25
It is supported and is rotationally driven by a required drive source. This drive
The roller 1 is rotationally driven by the rotational drive of the driving shaft 24. Reference numeral 6 denotes an electromagnetic induction heating mechanism disposed inside the hollow of the roller 1, and includes a cylindrical iron core 7 and an outer portion of the iron core 7 .
E Bei induction coil 8 are wound around the peripheral surface, one core 7
The end is fixedly supported on the bearing housing 25 or the machine base,
The roller 1 is held in a stationary state inside the roller 1, and the roller 1 generates induced heat by exciting the induction coil 8 with an AC power supply. Roller 1 and electromagnetic induction heating mechanism 6
The configuration of itself is not particularly different from the conventional cantilever type induction heating roller device. Reference numeral 12 denotes a metal plate, such as a steel plate, for forming a jacket chamber according to the present invention, and has a length substantially equal to the length in the circumferential direction along the inner peripheral surface of the roller 1. It is. As shown also in a part of the developed view shown in FIG. 3, a plurality of gutter portions 13 extending along the width direction are formed. Each gutter section 13 is used as a jacket chamber. Both ends of each gutter 13 are closed by ears 14 of the metal plate 12. Reference numeral 15 denotes a partition section that partitions adjacent gutter sections 13. The metal plate 12 on which the gutter portion 13 is formed as described above is rolled so that the opening surface of the gutter portion 13 faces the inner peripheral surface of the roller 1 and inserted along the inner periphery of the roller 1. And
Ear 14 and partition 15 of metal plate 12, ie, FIG.
, The shaded portion is brought into contact with the inner peripheral surface of the roller 1. The contact portion is fixed by electron beam welding, laser welding, brazing, or the like. Due to this fixation, the opening surface of the gutter portion 13 is closed by the inner peripheral surface of the roller 1. After this, gas-liquid 2 such as distilled water is
The phase heating medium is sealed under reduced pressure. The roller 1 and the metal plate 12 generate induced heat by the electromagnetic induction heating mechanism 6. As a result, the heat medium in the gutter 13 undergoes a phase change from a liquid phase to a gas phase. When the heat medium in the gas phase adheres to the low-temperature portion of the roller 1 and the metal plate 12,
It condenses here and produces latent heat. The latent heat directly heats the roller 1 or is transmitted from the metal plate 12 to the roller 1 via the partition 15 and the ears 14 to heat the roller 1 efficiently. In this case, since the gutter section 13 and the partition section 15 are extended along the axial direction of the roller 1, there is no temperature difference between the roller 1 and the axial direction. Roller 1
There is no jacket chamber formed of holes and voids inside the peripheral wall of the roller 1, and the thickness of the peripheral wall is uniform, and therefore, the thermal resistance in the heat conduction process is uniform, and therefore, in the circumferential direction of the roller 1, There is no temperature difference along. Further, since it is not necessary to provide a jacket chamber inside the peripheral wall of the roller 1, the roller 1 does not need to be made thicker than necessary, so that the weight can be reduced without increasing the size. When the thickness is uniform, thermal responsiveness is improved and control delay can be avoided. In the above-described example, the metal plate 12 has a gutter 13
Is formed and then attached to the roller 1, but instead of this, the unprocessed flat metal plate 12
Is inserted into the roller 1 as it is, and then necessary portions are fixed by welding or the like as described above.
The gutter portion 13 may be formed by deforming by applying hydrostatic pressure to the non-fixed portion. When the metal plate 12 is made of a conductive and non-magnetic material such as copper, the roller 1 carries a magnetic circuit because the metal plate 12 forms a one-turn secondary conductor. Since the metal plate 12 carries only the current circuit, the power factor for the AC power supply is improved. Then, one end (or both ends) of the roller 1
Has an annular groove 21 along the circumferential direction of the roller 1 inside.
The provided header ring 22 is attached, and this groove
21 and a through hole 23 communicating with each gutter portion 13 of the metal plate 12
Is formed. Thereby, each gutter portion 13 of the metal plate 12
It communicates through the through-hole 23, and the
The degree can be made more uniform. The induction heating roller device in this example
Is a cantilever type, but the present invention
Induction heating roller device supporting the thermal mechanism with bearings at both ends
Can also be applied. As described above, according to the present invention, the roller can be made uniform and light in the circumferential direction without increasing the size of the roller, and the roller has good thermal responsiveness. This has the effect of eliminating control delays.

[Brief description of the drawings] FIG. 1 is a front sectional view showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of the roller of FIG. FIG. 3 is a development view of a part of a metal plate. [Explanation of symbols] 1 roller 6 Electromagnetic induction heating mechanism 12 Metal plate 13 Hibe 21 grooves 22 Header ring 23 Through hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 6/14

Claims (1)

Claims: 1. An induction heating roller device comprising: a roller driven to rotate; and an electromagnetic induction heating mechanism provided inside the roller and causing the roller to generate heat. A metal plate provided with a plurality of gutter portions that are closed is fixed to the inner peripheral surface of the roller so that the opening surface of the gutter portion faces the inner peripheral surface of the roller, and at least one of the rollers is At the end, a header ring provided with an annular groove along the circumferential direction of the roller is provided, and each of the gutter portions communicates with the groove through an individual through hole formed in the roller along the radial direction thereof, An induction heating roller device comprising the gutter portion as a jacket chamber and a gas-liquid two-phase heat medium sealed therein.