JP2001210459A - Induction heat generation roller equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a degradation in the insulation of an induction heat generation mechanism by the occurrence of dew condensation which is produced in a circulation passage of a cooling medium, and make the insulating ability of the induction heat generation mechanism fall when the induction heat generation mechanism is cooled by using the cooling medium. SOLUTION: The induction heat generation mechanism which is constituted of a pipe-like iron core and an induction coil wound around the core is arranged on the inside of a roller body which can be rotated. In order to cool the induction heat generation mechanism, a pipe body is contacted and adhered to an inner circumference of the core, and the cooling medium is circulated inside the pipe body and the induction heat generation mechanism is cooled. The distribution mechanism circulates a dried gaseous body around the pipe body. With the circulating of the dried gaseous body, dew condensation ceases to occur on the surface outside the pipe body. Thereby, the degradation in the insulation of the induction heat generation mechanism is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotating induction heating roller device, and more particularly to an induction heating roller device having a cooling mechanism for cooling an induction heating mechanism.

[0002]

2. Description of the Related Art As is well known, an induction heating roller device is provided with an induction heating mechanism including an iron core and an induction coil wound around the inside of a rotating roller body. When the induction coil is excited by an AC power supply, the alternating magnetic flux generated by the excitation causes the roller body to generate heat.

[0003] In this configuration, the induction heating mechanism generates heat due to its own iron loss and copper loss, but the amount of heat generated is very small. Then, the temperature rises to a temperature equal to or slightly higher than that of the roller body.

[0004] When the temperature of the induction heating mechanism rises to a high temperature as described above, the electric wires constituting the induction coil are oxidized and the insulation performance of the insulator is reduced, so that the induction coil cannot be used for a long time. Not only that, the temperature becomes extremely high, and as the temperature of the iron core of the induction heating mechanism approaches the Curie point, the magnetic permeability approaches 1, which makes it difficult to cause the roller body to induce heat generation.

In order to prevent the temperature of the induction heating mechanism from rising, a pipe is fixed to the inner peripheral surface of the induction heating mechanism, and a cooling medium is circulated through the pipe from outside the roller body. There has been proposed another configuration in which the heat of the induction heating mechanism is absorbed by the apparatus (Japanese Patent Application Laid-Open No. 10-1998).
See No. 55881. ).

According to this, the temperature of the induction coil, the iron core and the like constituting the induction heating mechanism can be prevented from being increased by cooling, but the cooling medium flows through the pipe. While the temperature is low, the area around the tube is hot due to the heat from the induction heating mechanism, so that dew condensation occurs on the surface of the tube.

[0007] When such dew condensation occurs, the humidity around the dew increases, and it becomes moist. Due to this moisture, the insulation resistance of the induction coil may be reduced, or the insulation paper may absorb water and be broken, making it impossible to withstand use. In some cases, a ground fault may occur, leading to a major accident.

[0008]

SUMMARY OF THE INVENTION According to the present invention, when cooling an induction heating mechanism using a cooling medium, the occurrence of dew condensation due to the flow of the cooling medium is prevented, thereby preventing the insulation deterioration of the induction heating mechanism. With the goal.

[0009]

SUMMARY OF THE INVENTION The present invention cools an induction heating mechanism which is disposed inside a rotatable roller body and includes a cylindrical iron core and an induction coil wound therearound. For this reason, in a configuration in which a tube is abutted and fixed to the inner peripheral surface of the iron core and a cooling medium is circulated inside the tube to cool the induction heating mechanism, A circulation mechanism for circulating the dry gas is provided.

[0010] Dew condensation tends to occur on the outer surface of the tube due to the temperature difference between the inner surface, which is the lower temperature portion of the tube, and the outer surface, which is made high by the heat from the induction heating mechanism.
When the dry gas flows near the outer surface of the tube, the outer surface of the tube is in a dry state and does not condense. Therefore, the generation of moisture near the induction heating mechanism is eliminated, and the occurrence of dielectric breakdown and the like is thereby prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 is a roller body and 2 is a journal integrally attached to both sides thereof. This journal is rotatably supported by a machine base 4 via a bearing 3 and is rotatably driven by an arbitrary drive source. Reference numeral 5 denotes an induction heating mechanism, which comprises an iron core 6 formed in a cylindrical shape and an induction coil 7 wound therearound.

The induction heating mechanism 5 has support rods 8 on both sides thereof.
And is supported inside the roller body 1. The support rod 8 is inserted into the journal 2 with the rotation restricted, and is supported by the journal 2 via a bearing 9. The induction coil 7 is connected to a lead wire 10 and this lead wire 1
Numeral 0 is led out through the support rod 8 and connected to an external AC power supply.

A plurality of annularly formed pipes 11 are abutted on the inner peripheral surface of the iron core 6 at appropriate intervals, and fixed by welding or the like to be integrated. The tube 11 is desirably heat-resistant and non-magnetic, and is preferably made of, for example, stainless steel.

A cooling medium such as cooling water flows through each tube 11. For this purpose, the pipes 11 communicate with each other through the pipes 12 and are connected to the pipes 11 at one end (the right end in the example in the figure) of the plurality of pipes 11 arranged. , A supply pipe 13 for supplying the cooling medium, and a discharge pipe 14 for discharging the cooling medium supplied to the pipe 11 at the other end.
Concatenate.

The supply pipe 13 and the discharge pipe 14 are led out through the support rod 8. Supply piping 13
Is supplied to the right end pipe 11 first, and then flows through the other pipes 11 sequentially through the pipe 12. Then, the cooling medium flowing through the left end pipe 11 is discharged to the outside through the discharge pipe 14.

In the example shown in the figure, a plurality of pipes 11 are arranged and they are sequentially communicated with each other by a pipe 12. However, the present invention is not limited to such a configuration. For example, one pipe is formed in a spiral shape. And one end of the supply pipe 13
Alternatively, the discharge pipe 14 may be connected to the other end. The above configuration is not particularly different from the configuration already proposed.

When the cooling medium flows through the inside of the tube 11, the heat of the iron core 6 or the induction coil 7 in a high temperature state is absorbed by the cooling medium, so that the temperature can be prevented from rising. However, in this case, as described above, dew condensation occurs on the outer surface due to a temperature difference between the inner surface and the outer surface of the tubular body 11.

According to the present invention, in order to prevent dew condensation on the surface of the tube 11, dry air,
A circulation mechanism for circulating a dry gas such as a dry nitrogen gas is provided. For this purpose, in the configuration of FIG. 1, the introduction pipe 15 for introducing the dry gas is passed through the inside of one support rod 8 and inside the induction heating mechanism 5, specifically, inside the iron core 6. Then, the opening at the tip is directed toward the inside of the iron core 6. A discharge passage 16 is formed inside the other support rod 8.

Prior to supplying the cooling medium to the tube 11, a dry gas is introduced into the core 6 through the introduction tube 15. By this introduction, the dry gas also flows around the tube 11 as shown by the arrow, and the periphery is dried. The introduced dry gas is sequentially discharged to the outside through the discharge passage 16. If a cooling medium flows through the tube 11 in this state, dew condensation on the outer surface of the tube 11 is prevented even in the process of cooling the induction heating mechanism 5.

FIG. 2 shows another embodiment of the present invention. In this configuration, instead of forming the discharge passage 16 in the other support rod 8, a discharge pipe 17 is prepared and inserted through the inside of the iron core 6. The opening end (suction end) of the tip is located further outside the left end tube 11. The discharge pipe 17 is led out together with the introduction pipe 15 through the inside of the support rod 8. A suction pump or the like is connected to the leading end of the discharge pipe 17.

As in the configuration of FIG. 1, when dry gas is introduced into the core 8 through the introduction tube 15, the periphery of the tube 11 is dried. The dried gas introduced and dried around the pipe 11 is absorbed through the opening end of the discharge pipe 17 and discharged to the outside. Thereby, the occurrence of dew condensation on the tube 11 is prevented.

When the discharge pipe 17 is provided as described above, it is possible to control the dry state by the dry gas. That is, the dry gas is introduced from the introduction pipe 15 into the iron core 8 in a state where the discharge function of the discharge pipe 17 is stopped by stopping the operation of the suction pump connected to the discharge pipe 17. Then, after introducing the dry gas in an amount sufficient to dry the inside sufficiently, the introduction of the dry gas is stopped.

In this manner, the inside of the iron core 8 is filled with the dry gas, and this state is maintained.
When the filled dry gas leaks and decreases below a predetermined amount, a required amount of dry gas is introduced from the introduction pipe 11. As a result, the inside of the iron core 8 is always kept in a dry state, and the occurrence of dew condensation in the tube 11 is prevented. When the operation of the roller device is stopped or when dew condensation does not occur, the drying gas inside is discharged through the discharge pipe 16.

In the configuration shown in the figure, the iron core 6 may be formed of, for example, a wound iron core, or a core formed by sequentially laminating magnetic steel plates having portions curved along the involute curve. May be used.
When an iron core having such a shape is used, the thermal resistance of the iron core is reduced, and heat from the roller body is rapidly conducted through the iron core, so that the cooling efficiency of the tube 11 is improved.

[0025]

As described above, according to the present invention, even when a tube to which a cooling medium is supplied is provided for cooling the induction heating mechanism disposed inside the roller body, the tube is provided. , And the deterioration of the insulation performance due to moisture, moisture, etc. of the induction heating mechanism can be prevented, and this type of roller device can be used for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller main body 2 Journal 5 Induction heating mechanism 6 Iron core 7 Induction coil 11 Tube 15 Inlet tube 16 Discharge passage 17 Discharge tube

Claims (1)

[Claims] A rotatable roller body, a cylindrical core, and an induction coil wound around the core, the roller body being adapted to guide the roller body. An induction heating mechanism for generating heat, and a tube that is fixedly in contact with the inner peripheral surface of the iron core and through which a cooling medium flows, and a cooling medium that flows through the inside of the tube. An induction heating roller device configured to cool the induction heating mechanism, wherein an induction heating roller provided with a circulation mechanism that circulates dry gas around the tube so as to prevent dew condensation on the surface of the tube. apparatus.