JP5083891B2 - Cantilever induction heating roller device - Google Patents

Description

  The present invention relates to a cantilever induction heat roller device, and more particularly to a bearing and a cooling structure for a magnetic flux generation mechanism in the cantilever induction heat roller device.

  When heat-stretching synthetic fibers or the like, a cantilever induction heating roller that rotates at a peripheral speed that satisfies a high production speed of 4000 m / min to 6000 m / min may be used. In such a cantilever induction heating roller device, in order to stably rotate the roller at a high speed, the rotating shaft for rotating the roller body is moved close to the center of gravity of the roller body and supported by a bearing. It has been broken.

FIG. 7 shows the configuration of an example of a cantilever induction heating roller device in the case where the rotating shaft for rotating the roller body is brought close to the center of gravity of the roller body and supported by a bearing. 1 is a bottomed cylindrical roller body having a shaft fitting portion 1a protruding inside at the center of the bottom, 2 is an induction coil, and 3 is a magnetic steel plate that is curved and arranged in a radial direction along the circumferential direction. A cylindrical iron core 4 is integrated with the inner peripheral surface of the cylindrical iron core 3, an annular steel strip for securing cylindrical rigidity, 5 is a motor, 6 is a rotating shaft of a motor 5 that drives the roller body 1 to rotate. , 7 is a bearing housing having a flange 7 a that covers the opening of the roller body 1 at one end and is fixed to the outer shell of the motor 5, and an electric wire that supplies AC power to the induction coil 2.

A cylindrical magnetic flux generation mechanism comprising an induction coil 2 wound around the outer circumference of a cylindrical iron core 3 is disposed along the inner peripheral surface of the roller body 1 and is a bearing extending into the hollow interior of the cylindrical magnetic flux generation mechanism. The housing 7 is fixedly supported by a support fitting 8 at the tip. The roller body 1 is supported by fitting the tip end portion of the rotating shaft 6 of the motor 5 inserted through the bearing housing 7 into the shaft fitting portion 1a and fixing it. A bearing (not shown) is attached to the tip of the bearing housing, and the rotating shaft 6 of the motor 5 is supported by this bearing. The position of the bearing is disposed substantially at the center of gravity of the roller body 1, and the position of the support fitting 8 is substantially the center of gravity of the magnetic flux generating mechanism. Thus, by supporting the roller body 1 and the magnetic flux generating mechanism near the position of the center of gravity, vibration due to rotation of the roller is suppressed, and stable high-speed rotation can be obtained.

Incidentally, since the roller body 1 is rotated and heated to a high temperature (100 ° C. to 300 ° C.), the induction coil, for example, the aluminum electric wire at 2A / mm ² or more, a 3.2A / mm ² or more current copper wires The magnetic flux density of the iron core must be 8000 Gauss or higher. For this reason, the copper loss due to the current flowing through the induction coil and the iron loss due to the magnetic flux generated in the iron core are also large. There is a problem that the bearing function deteriorates early in synergy with the heat generated by itself. In order to solve this problem, it is necessary to cool the bearing.

As a means for cooling this bearing, a hollow hole is provided inside the rotating shaft of the motor so as to reach the position of the fan of the motor from the position corresponding to the installation location of the bearing. The heat medium is enclosed and the heat of the bearing is released by the latent heat transfer of the gas-liquid two-phase heat medium. However, in the latent heat transfer of the gas-liquid two-phase heat medium, there is a problem that not only the cooling capacity is limited, but the magnetic flux generation mechanism that is a heat generation source cannot be cooled.
JP-A-11-251052 JP 2000-173758 A

  The problem to be solved by the present invention is that it is possible to cool both the bearing and the magnetic flux generation mechanism arranged inside the hollow body of the roller body that generates induction heat with a simple structure, and to solve such a problem. It is.

The present invention provides a bottomed cylindrical roller body having a shaft fitting portion at the center of the bottom, and an outer periphery of a cylindrical iron core that generates heat from the roller body disposed along the inner peripheral surface of the roller body. A magnetic flux generating mechanism comprising a wound induction coil, a bearing housing having a flange that covers the opening of the roller body at one end, and extending to a substantially center of gravity of the roller body in the hollow interior of the cylindrical iron core; A piece comprising a rotating shaft inserted into a bearing housing and fitted and fastened to a shaft fitting portion of the roller body, and a motor that drives the rotating shaft, and the flange is fixed to the outer shell of the motor in self-supporting induction heating roller apparatus, the bearing cooling fluid through holes provided extending in the thickness of the housing to the tip of the bearing housing, the flows through the cooling fluid to the cooling fluid flow hole bearing To cool the Ujingu, rotating the rotary shaft part or fitted in close contact with all of the cylindrical core on the outer peripheral surface, it is mounted in the distal end portion of the bearing housing by the cooling of the bearing housing of the bearing housing The main feature is that the bearing that is freely supported and the magnetic flux generation mechanism are cooled.

In the cantilever induction heating roller device according to the present invention, the rotating shaft having the roller body fixed to one end is supported by the bearing mounted in the front end portion of the bearing housing extending to the substantially center of gravity of the roller body. and while suppressing the vibration due to rotation of the roller is, with stable high-speed rotation was obtained, in the thickness of the bearing housing arranged in Russia over La body hollow, and forming a cooling fluid through holes, the bearing A part or all of the cylindrical iron core of the magnetic flux generation mechanism is closely fitted to the outer peripheral surface of the housing, and the bearing housing and the magnetic flux in the bearing housing are cooled by passing the cooling fluid through the cooling fluid flow holes. Since the generating mechanism is cooled, both the magnetic flux generating mechanism and the bearing can be cooled with a simple and simple configuration. Moreover, since the magnetic flux generation mechanism is cooled, it is possible to suppress insulation deterioration due to heat of the magnetic flux generation mechanism.

  A cooling fluid flow hole is formed in the wall thickness of the bearing housing for the purpose of enabling both the bearing and the magnetic flux generation mechanism arranged inside the hollow body of the roller body that generates induction heat to be cooled with a simple structure. This is realized by passing a cooling fluid such as water or oil through the cooling fluid flow hole to cool the bearing housing, and cooling the bearing and the magnetic flux generating mechanism with the cooled bearing housing.

  FIG. 1 is a cross-sectional view showing a configuration of a cantilever induction heat roller apparatus according to an embodiment (first embodiment) of the present invention. In FIG. 1, reference numeral 5 denotes a motor, 6 denotes a rotating shaft of the motor 5, and 21 denotes a bottomed cylindrical roller body having a shaft fitting portion 21 a that protrudes inside at the center of the bottom portion. A plurality of jacket chambers 21b extending in the same direction as the axial direction for enclosing the gas-liquid two-phase heat medium are formed in the circumferential direction, and each of the plurality of jacket chambers 21b is formed with an annular hole 21c formed at the end of the roller body 21. Communicate. The surface temperature of the roller body 21 is made uniform by the latent heat transfer of the gas-liquid two-phase heat medium sealed in the jacket chamber 21b.

Reference numeral 22 is an induction coil, and 23 is a cylindrical iron core in which curved magnetic steel plates are radially arranged and laminated along the circumferential direction. The induction coil 22 is wound around the outer periphery of the iron core 23, and the induction coil 22 and the iron core 23 Thus, a cylindrical magnetic flux generation mechanism is configured. Reference numeral 23 a denotes a yoke that forms a magnetic path toward the inner peripheral surface of the roller body 21 connected to the end of the iron core 23. 23b is a coil presser. The coil presser 23b is replaced with a yoke when the bottom of the roller body 21 can be used as a yoke, and when the bottom cannot be used as a yoke. The magnetic flux generating mechanism has a length from the bottom of the roller body 21 to the opening in the roller body 21 and is disposed along the inner peripheral surface of the roller body 21. When an alternating voltage is applied to the induction coil 22, an alternating magnetic flux is generated, and the alternating magnetic flux passes through the thickness of the roller body 21 through the iron core 23, the yoke 23 a and the bottom of the roller body 21. The passage generates a current in the roller body 21, and the roller body 21 generates Joule heat by the current.

Reference numeral 25 denotes a bearing housing. A flange 25 a that covers the opening of the roller main body 21 is formed at one end of the bearing housing 25, and the tip of the other end is located substantially at the center of gravity of the roller main body 21. A bearing 26 that rotatably supports the rotating shaft 6 of the motor 5 is mounted inside the tip, and a part of the cylindrical iron core 23 is closely fitted to the outer peripheral surface of the bearing housing 25. At the time of this close fitting, an adhesive such as caulking resin or mold resin is filled between the outer peripheral surface of the bearing housing 25 and the inner peripheral surface of the cylindrical iron core 23, so that the bearing housing 25 and the cylindrical iron core 23 are May be integrated. In this case, the thermal resistance between the bearing housing 25 and the cylindrical iron core 23 is reduced, and the heat conduction efficiency between the bearing housing 25 and the cylindrical iron core 23 can be increased.

Within the wall thickness of the bearing housing 25, there are formed a plurality of cooling fluid flow holes 25b that open at the outer peripheral surface of the flange 25a and extend to the tip portion of the bearing housing 25. Each cooling fluid flow hole 25b is formed at the tip portion. It is folded and opened at the outer peripheral surface of the flange 25a. In the example shown in FIG. 1, each cooling fluid flow hole 25 b communicates with an annular cooling fluid flow hole 25 c formed at the tip of the bearing housing 25, and from the opening on the outer peripheral surface of the flange 25 a of the bearing housing 25. The flowing cooling fluid such as water or oil flows through the cooling fluid flow hole 25b, the annular cooling fluid flow hole 25c and the cooling fluid flow hole 25b and is discharged from the other opening on the outer peripheral surface of the flange 25a. The bearing housing 25 is cooled by the flow of the cooling fluid, and the magnetic flux generating mechanism and the bearing 26 are cooled by this cooling. Reference numeral 27 denotes a pressing metal for pressing the bearing 26.

In the above cantilever induction heat roller device, the magnetic flux generation mechanism and the bearing housing 25 are integrated, the rotating shaft 6 protruding from the motor 5 is inserted into the bearing housing 25, and the flange 25 a of the bearing housing 25 is connected to the motor 5. Fix directly to the outer shell. A bearing 26 is attached to support the rotating shaft 6, and the roller body 21 is fitted into a shaft fitting portion 21 a that protrudes inside at the center of the bottom portion and fixed with a bolt or the like. When the rotating shaft 6 rotates by this fixing, the roller body 21 rotates.

FIG. 2 is a cross-sectional view showing a configuration of a cantilever induction heat roller apparatus according to another embodiment (second embodiment) of the present invention. In addition, the same code | symbol is attached | subjected to the same part and corresponding part as 1st Example shown in FIG. 1, and description of the overlapping part is abbreviate | omitted. A difference from the first embodiment shown in FIG. 1 is that a concave portion 25d is formed on the outer peripheral surface of the bearing housing 25, and a cylindrical magnetic flux formed by the induction coil 22, the iron core 23, and the yokes 23a and 23c in the concave portion 25d. The heat generating member 28 is arranged on the outer peripheral surface of the convex portion 25e facing the inner surface of the roller main body 21 formed on the outer peripheral surface of the tip end portion of the bearing housing 25 while fitting the generating mechanism. By disposing the heat insulating member 28, it is possible to suppress the heat generated in the roller body 21 from being transmitted to the bearing housing 25. Further, by inserting a magnetic flux generating mechanism into the recess 25d on the outer peripheral surface of the bearing housing 25, the cylindrical iron core 23 can be closely fitted to the outer peripheral surface of the bearing housing 25 even when the inner diameter of the roller body 21 is small. .

FIG. 3 is a cross-sectional view showing the configuration of a cantilever induction heat roller apparatus according to still another embodiment (third embodiment) of the present invention. In addition, the same code | symbol is attached | subjected to the same part and corresponding part as 1st Example shown in FIG. 1, and description of the overlapping part is abbreviate | omitted. The difference from the first embodiment shown in FIG. 1 is that the length of a cylindrical magnetic flux generating mechanism (referred to as a first magnetic flux generating mechanism) constituted by the induction coil 22, the iron core 23, and the yokes 23a and 23c is shortened. The entire length of the iron core 23 is closely fitted to the outer peripheral surface of the bearing housing 25, and the induction coil 32, the cylindrical iron core 33 and the yoke 33a, between the tip of the bearing housing 25 and the substantially bottom portion of the roller body 21, A cylindrical second magnetic flux generation mechanism constituted by the coil presser 33b is arranged, and the yoke 33a is brought into close contact with the front end surface of the bearing housing 25. Dividing the magnetic flux generation mechanism in this way makes it easy to replace the bearing 26, and heat generation of the magnetic flux generation mechanism is divided in two, thereby enhancing the cooling effect of the entire magnetic flux generation mechanism.

In this case, a gap is provided between the first magnetic flux generation mechanism and the second magnetic flux generation mechanism, and the induction coil 32 of the second magnetic flux generation mechanism is formed on the outer peripheral surface of the bearing housing 25 in the gap as shown in FIG. A connector may be provided at the terminal 35 to which the lead wire 34 drawn out from the terminal 35 is connected or at the tip of the bearing housing 25. When this terminal or connector is provided, the second magnetic flux generation mechanism can be easily attached and detached when the bearing 26 of the bearing housing 25 is replaced. Reference numeral 28 denotes a heat insulating material covering the terminal 35 or the connector and disposed in the gap.

FIG. 4 is a cross-sectional view showing the configuration of a cantilever induction heat roller apparatus according to still another embodiment (fourth embodiment) of the present invention. In addition, the same code | symbol is attached | subjected to the part same as the 2nd Example shown in FIG. 2, and a corresponding part, and description of the overlapping part is abbreviate | omitted. A difference from the second embodiment shown in FIG. 2 is that an induction coil 32, a cylindrical iron core 33, a yoke 33a, and a coil presser 33b are formed between the tip of the bearing housing 25 and the bottom of the roller body 21. The cylindrical second magnetic flux generation mechanism is disposed, and the yoke 33a is brought into close contact with the front end surface of the bearing housing 25. Dividing the magnetic flux generation mechanism in this way makes it easy to replace the bearing 26, and heat generation of the magnetic flux generation mechanism is divided in two, thereby enhancing the cooling effect of the entire magnetic flux generation mechanism.

In this case, the induction coil 32 of the second magnetic flux generation mechanism is disposed on the outer peripheral surface of the convex portion 25e of the bearing housing 25 located between the first magnetic flux generation mechanism and the second magnetic flux generation mechanism as shown in FIG. It is preferable to provide a terminal 35 or a connector for connecting the lead wire 34 drawn out from the connector. When this terminal or connector is provided, the second magnetic flux generation mechanism can be easily attached and detached when the bearing 26 of the bearing housing 25 is replaced. Reference numeral 28 denotes a heat insulating material that covers the terminal 35 or the connector and is disposed on the convex portion 25e.

In any of the above-described embodiments, a current of ^{2 A} / mm ² or more with an aluminum wire and 3.2 A / mm ² or more with a copper wire is passed through the induction coil, and the magnetic flux density of the iron core is 8000 Gauss or more. Even when 21 is heated to a high temperature (100 ° C. to 300 ° C.) and rotated at a high speed of 4000 m / min to 6000 m / min, a normal grease lubricated bearing can be used.

It is sectional drawing which shows the structure of 1st Example which concerns on this invention. It is sectional drawing which shows the structure of 2nd Example based on this invention. It is sectional drawing which shows the structure of 3rd Example based on this invention. It is sectional drawing which shows the structure of 4th Example based on this invention. It is sectional drawing which shows the modification of 3rd Example based on this invention. It is sectional drawing which shows the modification of 3rd Example based on this invention. It is a block diagram shown in the partial cross section of the conventional cantilever type induction heating roller apparatus.

Explanation of symbols

5 Motor 6 Motor rotating shaft 21 Bottom cylindrical roller body 21a Shaft fitting portion 21b Jacket chamber 22, 32 Inductive coils 23, 33 Cylindrical iron core 25 Bearing housing 25a Flange 25b Cooling fluid flow hole 25c Cooling fluid flow hole 24 d of flow holes Concave part 25e Convex part 26 Bearing 27 It is a pressing metal fitting.
28 Thermal insulation member 34 Lead wire 35 Terminal

Claims (6)

A cylindrical roller body with a bottom having a shaft fitting portion at the center of the bottom, and the outer periphery of a cylindrical iron core that heats the roller body disposed along the inner peripheral surface of the roller body. A magnetic flux generating mechanism comprising an induction coil; a bearing housing having an end that covers an opening of the roller body; and a hollow housing of the cylindrical iron core that extends to a position approximately at the center of gravity of the roller body; A cantilever induction heat generation comprising: a rotating shaft inserted and fastened to a shaft fitting portion of the roller body; and a motor for driving the rotating shaft, wherein the flange is fixed to an outer shell of the motor. in the roller device, a cooling fluid through holes extending to the tip of the bearing housing in the wall thickness of the bearing housing is provided, the bearing housing flows through the cooling fluid to the cooling fluid flow hole To cool, the portion of the cylindrical core on the outer peripheral surface of the bearing housing or fitted in close contact with all, rotatably the rotation shaft mounted in the distal end portion of the bearing housing by the cooling of the bearing housing A cantilever induction heating roller device characterized by cooling a bearing to be supported and the magnetic flux generation mechanism. 2. The cantilever induction heating roller device according to claim 1, wherein a jacket chamber for enclosing a gas-liquid two-phase heat medium is provided in the wall thickness of the roller body. A cylindrical iron core is tightly fitted to the outer peripheral surface of the bearing housing, and a first induction coil is wound around the outer periphery of the cylindrical iron core between the tip of the bearing housing and the bottom of the roller body. 3. The cantilever induction heat roller device according to claim 1, wherein two magnetic flux generation mechanisms are arranged. The cantilever induction heat generation according to claim 1, wherein a concave portion extending in an axial direction is formed on an outer peripheral surface of the bearing housing, and a magnetic flux generation mechanism is fitted into the concave portion. Roller device. 5. The cantilever induction heat roller device according to claim 1, wherein the heat insulating member is provided on the outer peripheral surface of the bearing housing facing the inner peripheral surface of the roller body. . 6. The cantilever induction heat roller device according to claim 3, wherein a terminal or a connector for connecting a lead wire of an induction coil is provided at a tip portion of the bearing housing.

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