JP3758117B2 - Induction heating roller device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating roller device having a jacket chamber on a peripheral wall of a rotating roller body.
[0002]
[Prior art]
A jacket chamber is provided inside the peripheral wall of the roller body equipped with a magnetic flux generating mechanism composed of an induction coil and an iron core, and a gas-liquid two-phase heat medium is sealed in the interior, thereby the surface of the peripheral wall of the roller body An induction heating roller device that maintains a uniform temperature is already well known. If the control of the peripheral wall temperature of the roller body does not perform the required operation for some reason, and the roller body overheats and the heating medium in the jacket chamber becomes hot, the roller body is prevented from being damaged. In addition, a configuration in which a sealing mechanism using molten metal that melts at a high temperature is provided between the jacket chamber and the outside air has already been proposed (see Japanese Patent Publication No. 5-86638).
[0003]
However, according to the conventional sealing mechanism, since the jacket chamber is provided along the axial direction of the roller body, the high-temperature heat medium ejected from the jacket chamber due to the melting of the molten metal is the axial direction of the roller body. Will spout along. Therefore, when there is a worker in the vicinity, the worker may be exposed to a high-temperature heat medium, which is extremely dangerous.
[0004]
Further, the ejected heat medium may fall on the induction coil and iron core constituting the magnetic flux generation mechanism inside the roller body. Since the magnetic flux generation mechanism is usually hotter than the roller body, if a flammable medium (such as diphenyl ether) is used as the heating medium, it may ignite if the heating medium touches the magnetic flux generation mechanism. There is. Such an ignition causes a fire.
[0005]
[Problems to be solved by the invention]
In the present invention, a gas-liquid two-phase heat medium is sealed in a jacket chamber and sealed with a sealing mechanism using a molten metal that melts at a high temperature. It is an object of the present invention to prevent the heat medium from being ejected along the axial direction of the roller body or falling down to the magnetic flux generating mechanism even if it is ejected to the outside from the jacket chamber.
[0006]
[Means for Solving the Problems]
In the present invention, in a configuration in which a sealing mechanism using a melt that is opened at a high temperature is installed in a passage that communicates the end of the jacket chamber to the outside of the roller body, the heat medium that is jetted to the outer end of the passage A guide tube into which is introduced is attached, and the tip of the guide tube is bent so as to face the axis of the roller body.
[0007]
When the heating medium inside the jacket chamber is overheated and the melt of the sealing mechanism is in a molten state, the sealing by the sealing mechanism is released, and the heating medium is ejected to a passage communicating with the outside. The ejected heat medium is led out of the roller body through the guide tube. However, since the tip of the guide tube faces the axis of the roller body, the heat medium is ejected from the tip of the guide tube toward the outside. As a result, the hot jet heat medium is not jetted along the axial direction of the roller body, and does not fall into the internal magnetic flux generating mechanism.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a both-end-type induction heating roller device, 1 is a roller body, and a drive shaft 2 is connected to both ends of the roller body. The drive shaft 2 is rotatably supported by a machine base (not shown) and is driven to rotate by a required drive source. A support rod 3 is inserted into the drive shaft 2 and supported by the drive shaft 2 via a bearing 4. Reference numeral 5 denotes a magnetic flux generating mechanism, which is mainly composed of a cylindrical iron core 6 and an induction coil 7 wound around the outer periphery thereof.
[0009]
A jacket chamber 8 is provided inside the peripheral wall of the roller body 1 so as to extend along the axial direction of the roller body. A plurality of jacket chambers 8 are formed at substantially equal intervals along the circumferential direction of the roller body 1. Each jacket chamber 8 opens to a communication hole formed along the circumferential direction of the roller body. A gas-liquid two-phase heat medium is sealed inside the jacket chamber 8.
[0010]
These configurations are not particularly different from those of a normal induction heating roller device. A passage 10 communicates the end of the jacket chamber 8 and the outer surface of the roller body 1. A sealing mechanism 11 using molten metal is installed on the jacket chamber 8 side of the passage 10. Thus, the jacket chamber 8 is sealed.
[0011]
The details of the sealing mechanism 11 will be described with reference to FIG. 2. A ball-shaped valve 12 made of metal such as stainless steel, steel, or iron, and a screw 13 to which the valve 12 is fixed by an adhesive or the like are provided. The screw 13 is screwed into a screw portion 14 in a part of the passage 10, and the valve 12 is pressed against the open end of the jacket chamber 8 by this screwing. Thereby, the jacket chamber 8 is hermetically sealed.
[0012]
A through hole 15 passing through the center of the valve 12 is formed, and a pin 16 made of metal such as copper is inserted into the through hole 15 so as to penetrate the valve 12. A minute gap between the pin 16 and the inner surface of the through hole 15 is filled with a molten material, for example, a molten metal 17 made of a eutectic alloy such as solder. A through hole 18 having substantially the same diameter as the through hole 15 is formed in the screw 13, and an end portion of the pin 16 is inserted into the through hole 18. The through hole 18 communicates with the outer end side of the passage 10.
[0013]
One end of a guide tube 19 made of a heat-resistant metal is attached to the outer end of the passage 10 in an airtight manner. The other open end of the guide tube 19 is bent so as to face the axis of the roller body 1, in other words, to face the outer periphery of the drive shaft 2.
[0014]
Even when the heat medium in the jacket chamber 8 evaporates into a gas phase and the vapor flow touches the sealing mechanism 11 in the normal operation state of the roller, the majority of the heat is only touching the tip of the pin 16. The exposed area of the molten metal 17 in contact with the steam flow is very small, so that the molten metal 17 is not melted and the jacket chamber 8 is reliably sealed by the sealing mechanism 11.
[0015]
When the inside of the jacket chamber 8 becomes abnormally hot, the heat causes the molten metal 17 to melt and flow out into the passage 10. As a result, the pin 16 jumps out of the through hole 15 due to the pressure in the jacket chamber 8. As a result, the jacket chamber 8 communicates with the passage 10 through the through hole 15. By this communication, the heat medium inside the jacket chamber 8 is ejected toward the inside of the guide tube 19.
[0016]
However, since the other end of the guide tube 19 faces the axis of the roller body 1, the heat medium blows out toward the axis. As a result, the heat medium does not blow out along the axial direction of the roller body 1 as in the prior art, and does not fall on the magnetic flux generation mechanism 5 inside the roller body 1. Therefore, it is possible to avoid the risk of harming workers in the vicinity and the risk of fire due to the heat of the magnetic flux generation mechanism 5.
[0017]
Note that it is easily understood that the molten metal 17 which is a melt used here does not melt at a temperature during normal operation of the roller but melts at a temperature at an abnormally high temperature. However, when using a flammable heat medium as the heat medium, the molten metal does not melt at the temperature during normal operation of the roller and must be melted below the ignition point temperature of the heat medium. is there. In place of the molten metal 17, molten glass, molten resin, or the like can be used.
[0018]
Further, the sealing mechanism 11 and the guide tube 19 may be installed for each jacket chamber 8, but when the end portions of all the jacket chambers communicate with each other through the communication holes, it is not necessary to install all the jacket chambers. Or you may make it install only about several jacket chambers.
[0019]
【The invention's effect】
As described above, according to the present invention, when a gas-liquid two-phase heating medium is sealed in the jacket chamber and sealed with a sealing mechanism using a molten metal that melts at a high temperature, the roller body is in an overheated state. Even if the heat medium is ejected to the outside from the jacket chamber, the heat medium will not be ejected along the axial center direction of the roller body or dropped on the magnetic flux generation mechanism. It is possible to ensure safety, and even when a flammable medium is used, it is possible to reliably prevent the occurrence of a fire.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing an embodiment of the present invention.
FIG. 2, showing an embodiment of the present invention, is a front view with the upper half section taken in cross section.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roller body 5 Magnetic flux generation mechanism 8 Jacket chamber 10 Passage 11 Sealing mechanism 17 Molten metal 19 Guide tube

Claims (1)

In an induction heating roller device in which a jacket chamber is provided inside a peripheral wall of a roller main body provided with a magnetic flux generation mechanism, and a gas-liquid two-phase heat medium is sealed inside the jacket chamber, the end of the jacket chamber is A passage communicating with the outside of the roller body is provided, and a sealing mechanism using a melt that is opened by high temperature is installed in the passage, and a heat medium ejected from the jacket chamber is formed on the outer end side of the passage. An induction heating roller device in which a guide tube to be introduced is attached, and the guide tube is bent so that the open end of the guide tube faces the axial center of the roller body.

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