JPS6217359B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an induction heating roller device.

This kind of induction heating roller device rotates a roller equipped with an alternating magnetic flux generating mechanism inside by a rotating shaft, and at this time, a current is induced in the roller by the alternating magnetic flux generated by the alternating magnetic flux generating mechanism. The current causes the roller to generate heat. By the way, in such a roller device, it is required that the temperature range of the roller be made into a plurality of ranges having different temperatures from each other.

Conventionally, for this purpose, a configuration has been proposed in which a plurality of rollers are arranged and fixed in parallel to a single rotating shaft along its axial direction. According to this, each roller is made to generate heat independently by mutually independent alternating magnetic flux generating mechanisms provided inside each roller, and therefore the voltage or frequency of the power source of each magnetic flux generating mechanism is different. If this is done, the heat generation temperature of each roller will be different.

However, with this configuration, it cannot be ignored that the heat generated by one roller affects the temperature of the other roller. In other words, mutual thermal influence between the heat generating areas of both rollers becomes a major problem. In the conventional configuration described above, a heat insulating material is interposed between both rollers in order to avoid this thermal influence. According to this, even if the above-mentioned thermal influence can be avoided, the following problems occur. In other words, in order to avoid this thermal effect, the thermal resistance of the insulating material used has a large effect, but in general, the thicker the insulating material (the length along the axis of the roller), the more the rollers will be able to interact with each other. It is thought that the thermal effects of this will be reduced. Therefore, if the thickness of the heat insulating material is increased in order to sufficiently avoid this thermal effect, the boundary range between both rollers (the distance between both rollers) must become correspondingly longer.

For example, as shown in FIG. 7, each roller R ₁ ,
When a thick insulating material D is interposed between R ₂ to sufficiently avoid the thermal influence of both rollers (in the figure, S is the rotating shaft, and W ₁ and W ₂ are windings for generating magnetic flux), The temperature distribution of each roller is as shown by curve A. As will be understood from this, the temperature distribution area M ₀ at the boundary between the temperature distribution area M ₁ of one roller R ₁ and the temperature distribution area M ₂ of the other roller R ₂ approximately corresponds to the thickness of the insulation material. Therefore, the range of this region M ₀ naturally becomes longer due to the thickness of the heat insulating material D. Therefore, if the total length L ₀ of the roller mechanism is constant, the length of each roller R ₁ and R ₂ will be shortened, and each temperature range
M ₁ and M ₂ become shorter. If the length of each roller R ₁ and R ₂ is constant, the total length L ₀ will be correspondingly long, which will increase the weight and increase the rotational driving force. become.

In order to avoid these problems, if the insulation material D is made thinner as shown in Figure 8, the temperature gradient will become steeper in the region _M0 corresponding to the thickness of the insulation material D, as shown in the temperature distribution curve B. However, since the thermal influence of each roller cannot be sufficiently avoided, the constant temperature region of each temperature region M ₁ and M ₂ ends up being shorter than the length of the roller. Therefore, in order to lengthen each constant temperature region, each roller R ₁ and R ₂ must be lengthened, and as in the case of Fig. 7, it is impossible to avoid increasing the size and weight of the roller mechanism. It becomes like this.

An object of the present invention is to form a plurality of temperature regions having different temperatures on a roller without increasing the size and weight of this type of roller.

The present invention is characterized in that jacket chambers for vacuum-sealing a two-phase gas-liquid heat medium are provided in correspondence to each temperature range to be formed inside the peripheral wall of the roller. As is well known, when this parent jacket chamber is installed, the surface temperature of the peripheral wall of the roller corresponding to the jacket chamber becomes uniform over the entire length of the peripheral wall. By utilizing this effect, the constant temperature region in each temperature region has a length corresponding to the length of the jacket chamber. Therefore, even if the temperature regions are sufficiently close to each other, each temperature region is less likely to be interfered with by the heat generated by the other roller. Therefore, there is no thermal influence on each other even without using a heat insulating material as in the conventional case. Since there is no need to use a heat insulating material in this way, it is possible to avoid increasing the size and weight of this type of roller.

Embodiments of the invention will be described with reference to the drawings. 1st
The first embodiment shown in the figure shows a configuration in which there are two temperature ranges to be obtained. In the figure, 1 is a hollow roller made of magnetic material, and 2 is a roller 1.
The end plate 1A has a rotating shaft whose tip is fixed at the center of the end plate 1A, and is rotated by a required drive source. This rotation causes the roller 1 to rotate coaxially with the rotating shaft.

In accordance with the spirit of the invention, two alternating magnetic flux generating mechanisms 3 are provided inside the roller 1. The alternating magnetic flux generating mechanism 3 shown in the figure is composed of an iron core 4 and two windings 5 that are commonly wound around the outer periphery of the iron core along the axial direction of the roller 1. The outer end of the iron core 4 is fixed to a required frame or the like outside the roller 1, and is stationary inside the roller 1.

Each lead 6 led out from each winding 5 is connected to an AC power source 8 via a temperature controller 7, respectively. When each winding 5 is excited by the AC power supply 8, an alternating magnetic flux is generated, and a current is induced in the peripheral wall portions 1B and 1C corresponding to the length along the axial direction of each winding 5 of the roller 1. I get a fever. The heating principle is not particularly different from that of a normal induction heating roller of this type. When trying to maintain the temperature of each peripheral wall part 1B, 1C at a constant value, each peripheral wall part 1B, 1
A temperature detector 9 for detecting the temperature of C is prepared, and the temperature controller 7 is controlled by the detection output to change the voltage supplied to the winding 5, for example.
So-called fixed value control may be performed.

A jacket chamber 11 in which a gas-liquid two-phase heat medium is sealed in a vacuum state is installed inside each of the peripheral wall portions 1B and 1C (thick wall portion). In the illustrated embodiment, a plurality of jacket chambers extending in the axial direction of the roller 1 are arranged along the circumferential direction of the roller 1, as shown in FIG. To construct both jacket chambers 11, it is sufficient to drill a plurality of holes 12 from both sides of the roller 1 to a depth that does not interfere with each other, and then seal the heat medium therein. Then, each hole may be closed by welding or the like.

In the above configuration, when the winding 5 is excited while the roller 1 is rotated by the rotary shaft 2, each of the peripheral wall portions 1B and 1C generates heat as described above. When the heat medium in the jacket chamber 11 is heated by this heat, the heated heat medium changes from a liquid phase to a gas phase. Furthermore, when the heat medium that has been changed into a gaseous phase comes into contact with a still-low-temperature area within the jacket chamber, it changes back into a liquid phase. As such phase transformation is repeated, the entire temperature distribution within the jacket chamber 11 becomes uniform. Due to this uniform temperature distribution, the peripheral wall portions 1B and 1C facing each jacket 11 have a uniform temperature distribution in their longitudinal regions. This uniform temperature distribution is forced by the heat medium. Therefore, the temperature gradient in the peripheral wall portion 1D between the peripheral wall portions 1B and 1C follows the temperature difference between both the peripheral wall portions 1B and 1C.

FIG. 3 shows an example of the temperature distribution of the peripheral wall of the roller 1 in the configuration shown in FIG. The heat generation temperature of 1C is uniform over the entire length of each peripheral wall portion 1B, 1C in the longitudinal direction. The temperature gradient of the peripheral wall portion 1D follows the difference between the heat generation temperatures TA and TB. In this case, the peripheral wall 1
If the length of D becomes even shorter, the temperature gradient will become even steeper.

As will be understood from this, when temperature regions with different temperatures are formed on one roller, even if the distance between the two temperature regions is short, the two temperature regions will not be affected by each other's heat, and therefore, conventional The constant temperature range does not become short as in In addition, the roller does not have to become large or heavy in order to prevent the constant temperature region from becoming short.

In the above embodiment, there are two temperature regions, but it is also possible to have a large number of temperature regions as shown in FIG. The embodiment shown in the figure is an example in which three temperature regions are used. In order to have such a configuration, the roller 1
Roller 1 from one or both sides of the
A large number of holes extending in the axial direction of the roller 1 are provided in the thick portion thereof along the circumferential direction of the roller 1. After that, the heat pipe 1 is filled with a gas-liquid two-phase heat medium in a vacuum.
3 (three in the example shown) may be inserted into the holes at appropriate intervals. A heat pipe 13 is inserted into each hole. Note that a spacer piece 14 is filled between each heat pipe 13 to restrict movement of each heat pipe 13 in the axial direction. Note that a heat insulating material is suitable for the spacer piece 14. FIG. 6 is a temperature distribution diagram of the peripheral wall portions 1B, 1C, and 1E in the configuration shown in FIG. 3, where the respective temperatures are designated as TA, TB, and TC.

As detailed above, according to the present invention, when generating heat by dividing the circumferential wall portion of a single roller along its axial direction into sections having different temperatures,
There is no need to increase the distance between the peripheral walls as in the past, and there is no need to make each peripheral wall sufficiently long so that the constant temperature region becomes long, so there is no need to increase the size and weight of the roller. It produces the same effect without it.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention;
3 is a temperature distribution characteristic diagram, FIG. 4 is a sectional view showing another embodiment of the present invention, FIG. 5 is a sectional view of the upper half of the roller, and FIG. 6 is a sectional view of the upper half of the roller. is a temperature distribution characteristic diagram, and FIGS. 7 and 8 are temperature distribution characteristic diagrams of conventional examples. 1...roller, 1B, 1C, 1E...peripheral wall part,
3... Magnetic flux generation mechanism, 11... Jacket chamber.

Claims (1)

[Claims] 1. Inside a rotatably supported roller, a plurality of separately controlled magnetic flux generating mechanisms are arranged along the axial direction of the roller, and each peripheral wall of the roller corresponds to each of the magnetic flux generating mechanisms. An induction heating roller device that has a jacket chamber in which a gas-liquid two-phase heat medium is enclosed.