JPH0548393Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to an induction heating roller device.

(Prior art) In this type of device, even if a plurality of jacket chambers are installed independently from each other along the axial direction inside the peripheral wall of the roller in order to avoid application as a pressure vessel, the circumference of the roller It is required to prevent temperature differences from occurring along the circumferential direction.

In order to satisfy this requirement, a plurality of jacket chambers provided along the axis of the roller are communicated with each other through an annular groove, and inside the jacket chamber there is provided a jacket along the entire length along the axis of the roller. The present inventor has already proposed a system in which separate jacket chambers are installed independently and a gas-liquid two-phase heating medium is sealed inside each jacket chamber (Japanese Patent Application No. 116356/1983). issue).

According to this, mutually independent jacket compartments are
Because its internal volume can be reduced, it has a relatively low boiling point,
Even if distilled water, which has high vapor pressure and high latent heat, is sealed as a heat medium, it will not be applied as a pressure vessel.

However, since the jacket chambers having this jacket chamber inside communicate with each other and are provided over the entire length of the roller, the total internal volume thereof becomes large. Therefore, in order to avoid being used as a pressure vessel, it is necessary to select a heat medium with a relatively low vapor pressure, and therefore, one with a low latent heat, such as an organic oil, must be used. Become.

For example, the boiling point of distilled water is 100℃, and the latent heat at the boiling point is 539Kcal/Kg;
The latent heat of organic heat transfer oil at 176℃ is approximately 70Kcal/
Kg. This means that the effect of reducing the temperature difference along the circumferential direction of the roller by heat transport through evaporation and condensation of the organic heat transfer oil sealed under reduced pressure in a gas-liquid two-phase state is that distilled water is sealed under reduced pressure as a heat transfer medium. This means that it is significantly inferior to what it would have been if they had done so.

Therefore, depending on the conditions in which the roller is used, the use of organic heat transfer oil may not provide sufficient temperature uniformity. However, if distilled water is used, it will have to be applied as a pressure vessel.

(Problem that the invention attempts to solve) This invention allows the use of distilled water as a heat medium in the jacket chamber to eliminate temperature differences along the circumferential direction of the roller, and still avoids application as a pressure vessel. The purpose is to do so.

(Means for Solving the Problems) This invention provides a plurality of mutually independent first jacket chambers extending in the axial direction of the roller on the peripheral wall of the roller, and a plurality of mutually independent first jacket chambers located inside the first jacket chamber. Then, a second jacket chamber that communicates with the roller is installed at a location close to this, extending halfway along the axial direction of the roller, and a gas-liquid two-phase gas is supplied to the first and second jacket chambers. It is characterized by enclosing a heat medium such as distilled water.

(Example) An example of this invention will be described with reference to the drawings. Reference numeral 1 denotes a roller, which is rotated by a rotary drive source (not shown), and 2 a shaft, which supports the rotation of the roller 1 through a bearing 3.

Reference numeral 4 denotes an induction heating mechanism installed inside the roller 1, which is mainly composed of an induction coil 5 and an iron core 6 around which the induction coil 5 is wound.
Supported by When the induction coil 5 is excited by an AC power source, a current is induced in the peripheral wall 1A of the roller 1, and the peripheral wall generates heat due to this current.

In the example shown, the shaft 2 is fixed and the roller 1 is rotated by being supported by it, but instead of this, the roller 1 is fixed to the shaft 2 and the shaft 2 is driven to rotate. Therefore, the roller 1 may be rotated. At this time, the induction heating mechanism 4 is
It may be made to rotate integrally with these rotating bodies, or it may be fixed to a machine stand or the like which is fixed separately from these rotating bodies.

Reference numeral 10 denotes a first jacket chamber, which is formed by a hole extending in the axial direction of the peripheral wall 1A of the roller 1. A plurality of jacket chambers 10 are arranged in parallel in the circumferential direction of the roller 1 and are installed independently from each other.

A plurality of second jacket chambers 11 are installed inside the jacket chamber 10 and close to the jacket chamber 10. This jacket chamber 11 also extends in the axial direction of the roller 1, but is formed only halfway.

To explain this specifically, the jacket compartment 10
is constructed by passing a hole through the roller 1 along the axial direction and sealing both ends of the hole with a lid 12.

The jacket chamber 11 is constructed by drilling a hole halfway from the end of the roller 1 at a location located inside the location where the jacket chamber 10 is formed. Each jacket chamber 11 communicates with each other. For this purpose, an annular groove is provided so as to straddle the open end of the hole constituting the jacket chamber 11, and this groove is closed by the annular body 13 so as to form a communication groove 14. Reference numeral 15 indicates a welded portion between the lid 12 and the annular body 13.

In both the jacket chambers 10 and 11, a substance having a relatively low boiling point, high vapor pressure, and large latent heat, such as distilled water, is sealed under reduced pressure. Of course, both jacket chambers are designed to have an internal volume within a range that does not allow them to be used as pressure vessels, with respect to the vapor pressure at a predetermined temperature, even when this distilled water is sealed.

This is because even if the jacket chambers 10 are extended over the entire length of the roller 1, they are each independent, so the internal volume of each jacket chamber 10 can be designed to be small, and even if there are a plurality of jacket chambers 11, roller 1
Since the length is only halfway along the axial direction, the overall internal volume can be designed to be small. Therefore, even if distilled water is used as a heat medium, it can be constructed so that application as a pressure vessel can be avoided.

In the above configuration, when a temperature difference occurs along the axial direction of the roller 1, the jacket chamber 10
The fact that the temperature is equalized by latent heat due to evaporation and liquefaction of the heat medium inside the roller is not particularly different from ordinary rollers of this type.

Next, if a temperature difference occurs along the circumferential direction of the roller 1, the heat from the jacket chamber 10 on the high temperature side is transferred to the jacket chamber 11 installed close to the inside of the jacket chamber 10. roller 1
Heat is transferred through the wall portion 1B. This heat causes the heat medium in the jacket chamber 11 to evaporate, removing latent heat of evaporation.

The steam generated by this evaporation flows along the communication groove 14 and flows into the jacket chamber 11 on the lower temperature side,
In other words, it goes to the low vapor pressure region, where it condenses and provides latent heat. The latent heat at this time is transferred from the jacket chamber 11 to the low-temperature side jacket chamber 10 located close to the outside of the jacket chamber 11, and from the wall 1B in between.
heat is transferred through.

In the jacket chamber 10 where the heat has been transferred, the heat medium sealed therein evaporates and then condenses on the wall surface of the jacket chamber 10, imparting latent heat and serving to increase the temperature of that area. As a result of the above, the temperature difference in the circumferential direction of the roller 1 is made uniform.

In the illustrated embodiment, the jacket chambers 11 are provided at both ends of the roller 1, but instead, they may be provided only at one end.

(Effects of the invention) According to the invention detailed above, temperature equalization along the axial direction and circumferential direction of the roller is reliably performed, and even if two types of jacket chambers are provided for this purpose, the pressure vessel It can be manufactured in such a way that it can be easily applied as a heat exchanger, and furthermore, since distilled water or the like is used as a heat medium, it has the effect of efficiently achieving temperature uniformity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a partially enlarged sectional view of FIG. 1, and FIG. 3 is a partial cross-sectional view of FIG. 2. 1...roller, 4...induction heating mechanism, 10...
First jacket chamber, 11... second jacket chamber, 14... communication groove.

Claims (1)

[Scope of utility model registration request] A plurality of mutually independent first jacket chambers extending in the axial direction of the roller are arranged in the circumferential direction of the roller on the peripheral wall of the roller which is equipped with an induction heating mechanism inside and is rotatable. a plurality of second jacket chambers that are arranged along the rollers and communicate with each other at a location inside and close to the first jacket chamber and extend halfway along the axial direction of the roller; An induction heating roller device, wherein the first and second jacket chambers are filled with a gas-liquid two-phase heat medium such as distilled water.