Induction heating roller device

Abstract

The present invention provides an induction heating roller device, which improves the cooling performance of a structure in which a roller body and / or an induction heating mechanism are uniformly cooled by gas, and comprises: a roller body (2); an induction heating mechanism (3) for causing the roller body (2) to be inductively heated; and a cooling mechanism (7) for cooling the roller body (2) and / or the induction heating mechanism (3) by utilizing a gap (X1) between the roller body (2) and the induction heating mechanism (3), wherein the cooling mechanism (7) comprises: a roller body (2) formed on one axial end side and connected to the gap (X1); An inlet (71); an outlet (72) formed on the other axial end side of the roller body (2) and connected to the gap portion (X1); a suction mechanism (73) for sucking gas from the gap portion (X1) from the outlet (72); and a spray supply mechanism (74) for supplying spray to the inlet (71), wherein the inlet (71) is formed on a journal flange portion (221) on one axial end side of the roller body (2), and the outlet (72) is formed on a journal flange portion (221) on the other axial end side of the roller body (2).

Description

Technical Field

[0001] The invention relates to an induction heating roller device. Background Art

[0002] In the continuous heat treatment process of thin sheet materials such as plastic film, paper, cloth, non-woven fabric, synthetic fiber, metal foil, or continuous materials such as textile materials and thread (filament) materials, an induction heating roller device is used. The induction heating roller device is provided with an induction heating mechanism inside a rotating roller body, thereby heating the peripheral wall of the roller body by an induced current.

[0003] In recent years, for example, when the type of continuous material is changed, it is required to change the heating temperature of the roller body in a short time. In addition, after the heat treatment process is completed, the operator cannot leave the site unless the temperature of the roller body is lowered below a certain temperature for safety and sanitation reasons. Therefore, it is necessary to cool the roller body in the shortest possible time.

[0004] As a device for cooling the roller body, an air-cooling device that cools the roller body by sucking gas from the gap between the roller body and the induction heating mechanism, as shown in Patent Document 1, can be considered. Specifically, in the roller device, an air intake port is formed in the journal flange portion on one axial end side of the roller body, and an exhaust port is formed in the journal shaft portion on the other axial end side of the roller body, and the gas in the gap is sucked from the exhaust port. With the above structure, the gas that flows into the gap from the air intake port flows between the shell portion of the roller body and the induction heating mechanism, and flows between the journal shaft portion of the roller body and the support shaft of the induction heating mechanism, and then is discharged to the outside from the exhaust port.

[0005] In addition, as shown in Patent Document 2, a cooling medium introduction channel is formed on a support shaft supporting a cylindrical core of an induction heating mechanism, and a mist cooling medium is introduced from the cooling medium introduction channel into a gap (gap) between a roller body and the induction heating mechanism.

[0006] Prior art literature

[0007] Patent document 1: Japanese Patent Publication No. 2019-75357

[0008] Patent Document 2: Japanese Patent Publication No. 2011-108399

[0009] In the structure of the above-mentioned Patent Document 1, the gap between the journal shaft portion of the roller body and the support shaft of the induction heating mechanism is smaller than the gap between the shell portion of the roller body and the induction heating mechanism. Thus, due to the pressure loss in the gap between the journal shaft portion of the roller body and the support shaft of the induction heating mechanism, the gas flow rate is reduced, and it is difficult to improve the cooling performance.

[0010] Specifically, the outer diameter of the journal shaft is specified by the user, and regardless of the outer diameter of the shell of the roller body, the outer diameter of the journal shaft tends to become thinner. Moreover, the inner diameter of the journal shaft is determined to have a certain wall thickness relative to the outer diameter of the journal shaft. In addition, the outer diameter of the support shaft of the induction heating mechanism inserted into the interior is determined by the cross-sectional area of ​​the power supply wiring of the induction heating mechanism, etc. The cross-sectional area (flow cross-sectional area) of the gap between the journal shaft and the support shaft of the induction heating mechanism is thereby determined. Although the cooling object is the shell of the roller body, the cooling is restricted by the gap between the journal shaft and the support shaft of the induction heating mechanism. In particular, if the shell of the roller body is enlarged in diameter and / or lengthened, the mass (heat capacity) becomes larger, thereby requiring a larger cooling capacity. However, due to the gap between the journal shaft and the support shaft of the induction heating mechanism, it is difficult to achieve a larger cooling capacity.

[0011] Furthermore, in the structure of Patent Document 2, since the mist cooling medium is introduced through the inside of the support shaft of the induction heating mechanism, it may be heated and vaporized before reaching the shell of the roller body. This makes it impossible to efficiently extract the latent heat of vaporization from the shell of the roller body, making it difficult to achieve a large cooling capacity. Summary of the invention

[0012] To solve the above problems, a main object of the present invention is to improve the cooling performance in a structure in which a roller body and / or an induction heating mechanism are uniformly cooled by gas.

[0013] That is, the induction heating roller device of the present invention is characterized in that it includes: a hollow roller body; an induction heating mechanism arranged in the hollow and causing the roller body to induction heat; and a cooling mechanism that uses the gap between the roller body and the induction heating mechanism to cool the roller body and / or the induction heating mechanism, the cooling mechanism including: an inlet formed on one axial end side of the roller body and connected to the gap; an outlet formed on the other axial end side of the roller body and connected to the gap; a suction mechanism that sucks gas from the gap from the outlet; and a spray supply mechanism that supplies spray to the inlet, the inlet being formed on a journal flange portion on one axial end side of the roller body, and the outlet being formed on a journal flange portion on the other axial end side of the roller body.

[0014] According to the induction heating roller device of the present invention, since the inlet is formed on the journal flange portion at one axial end side of the roller body, the gas flowing in from the inlet flows into the gap portion from the inlet at one axial end side of the roller body, and does not pass through the gap between the journal shaft portion of the roller body and the support shaft of the induction heating mechanism. In addition, since the outlet connected to the suction mechanism is formed on the journal flange portion at the other axial end side of the roller body, the gas flowing in from the inlet is discharged to the outside from the outlet at the other axial end side of the roller body, and does not pass through the gap between the journal shaft portion of the roller body and the support shaft of the induction heating mechanism. In this way, the pressure loss caused by the gap between the journal shaft portion of the roller body and the support shaft of the induction heating mechanism is not restricted at both axial ends of the roller body. As a result, the flow rate of the gas flowing through the gap portion can be increased, thereby improving the cooling performance.

[0015] Furthermore, according to the induction heating roller device of the present invention, since the spray is supplied to the inlet formed on the journal flange, the path for the spray to reach the shell of the roller body can be shortened, so that the spray can be efficiently introduced into the shell of the roller body. As a result, by increasing the humidity of the gas flowing from the inlet, the specific heat of the gas can be greatly increased, and the latent heat of vaporization can be efficiently taken away from the shell of the roller body, so that the cooling performance can be improved.

[0016] Furthermore, according to the present invention, since the high-temperature gas heated by flowing through the gap does not pass through the gap between the journal shaft of the roller body and the support shaft of the induction heating mechanism, contact with the bearing provided on the journal shaft can be avoided, thereby suppressing the reduction in the life of the bearing.

[0017] The roller body has a cylindrical shell and a pair of journals connected to both axial ends of the shell. In addition, in order to obtain a cooling effect on the roller body and the like and circumferential temperature uniformity of the roller body, it is preferred that the gas flowing through the gap flows at a uniform flow rate in the circumferential direction. Therefore, it is preferred that a plurality of the inlet ports are formed on the journal flange portion on one axial end side of the roller body, and / or a plurality of the outlet ports are formed on the journal flange portion on the other axial end side of the roller body. By providing a plurality of inlet ports and / or outlet ports, flow resistance can be reduced while ensuring the mechanical strength of the journal, and gas and spray can flow uniformly in the circumferential direction of the gap.

[0018] The introduction port rotates because it is arranged on the roller body side, but the spray supply mechanism does not rotate because it is arranged on the stationary side. As a specific embodiment of supplying spray to the rotating introduction port, the spray supply mechanism preferably includes: a head arranged on the stationary side so as to cover the introduction port; and a spray generating device arranged on the head.

[0019] By providing the head, there is a possibility that the suction resistance of the gas will become larger. Therefore, it is preferable that the head has an external air introduction port for introducing external air into the head space of the head.

[0020] In order to prevent the spray from leaking out of the head, the spray supply mechanism preferably further includes a rotary seal mechanism provided between the head and the journal flange portion to isolate the head space from the outside air except for the outside air inlet.

[0021] As a specific support structure of the head portion, it is preferable that the head portion is stationarily supported on an outer peripheral surface of a journal shaft portion of the roller body via a bearing.

[0022] As another specific supporting structure of the head, it is preferable that the head is stationarily supported by being fixed to a stationary structure member provided separately from the roller body.

[0023] The cooling heat in the roller body and the time required for cooling are proportional to the flow rate of the gas, that is, the flow rate. That is, as the flow rate of the gas in the gap increases, the cooling heat increases and the cooling time is shortened. However, in load operation, since the required cooling amount varies depending on the heat of the load and the operating conditions, it is preferred that the cooling mechanism adjusts the flow rate of the gas flowing through the gap accordingly. According to the above structure, the temperature of the roller body can be effectively adjusted to a specified value.

[0024] In order to prevent the cooling medium from condensing or coagulating inside the roller body and improve the cooling performance, it is preferably also provided with a temperature sensor for detecting the temperature of the lowest temperature part inside the roller body, and the spray supply mechanism adjusts the supply amount of the spray in such a way that the dew point temperature of the wet gas in the gap part is not lower than the temperature of the lowest temperature part.

[0025] According to the present invention having the above structure, in a structure in which the roller body and / or the induction heating mechanism is uniformly cooled by gas, the cooling performance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view schematically showing the structure of an induction heating roller device according to one embodiment of the present invention.

[0027] Figure 2 It is a cross-sectional view taken along line AA showing the structure of the introduction port of the same embodiment.

[0028] Figure 3 It is a BB line cross-sectional view showing the structure of the lead-out port of the same embodiment.

[0029] Figure 4 This is a cross-sectional view showing the structure of the other axial end side (suction mechanism) of the roller body in the same embodiment.

[0030] Figure 5 This is a cross-sectional view of the structure of one axial end side (spray supply mechanism) of the roller body in the same embodiment.

[0031] Figure 6 It is a cross-sectional view showing a fixing structure of a head portion of a suction mechanism in a modified embodiment.

[0032] Figure 7 It is a cross-sectional view showing a fixing structure of a head portion of a spray supply mechanism in a modified embodiment.

[0033] Figure 8 It is a schematic diagram showing the structure of the introduction port according to a modified embodiment.

[0034] Description of Reference Numerals

[0035] 100 Induction heating roller device

[0036] 2 Roller body

[0037] 21 Shell

[0038] 221 Journal flange

[0039] 3 Induction heating mechanism

[0040] X1 Gap

[0041] 7 Cooling mechanism

[0042] 71 Import port

[0043] 72 Export port

[0044] 73 Attracting institutions

[0045] 74 Spray supply mechanism

[0046] 741 Head

[0047] 741H External air intake

[0048] 742 Spray Generator

[0049] 743 Rotary Seal Mechanism

[0050] 92 Bearings

[0051] S1 Temperature Sensor DETAILED DESCRIPTION

[0052] The induction heating roller device 100 according to one embodiment of the present invention is used in a continuous heat treatment process of a continuous material such as a thin sheet material or a fabric material, or a thread (filament) material such as a plastic film, paper, cloth, nonwoven fabric, synthetic fiber, or metal foil.

[0053] (Device Structure)

[0054] like Figure 1 As shown, the induction heating roller device 100 of the present embodiment includes: a hollow cylindrical roller body 2 rotatably supported; and an induction heating mechanism 3 disposed in a stationary state in the hollow of the roller body 2 .

[0055] The roller body 2 has a cylindrical shell 21 and a pair of journals 22 provided at both ends of the shell 21. The journal 22 has a journal flange 221 covering the end opening of the shell 21, and a hollow journal shaft 222 integrally formed with the journal flange 221. The journal shaft 222 is rotatably supported by the machine bases 51 and 52 via bearings 41 and 42 such as rolling bearings. The roller body 2 is rotated by a driving force applied from the outside by a rotation drive mechanism (not shown) such as a motor.

[0056] In addition, a plurality of jacket chambers 21A are formed at intervals, for example, at equal intervals, in the entire circumferential direction on the shell portion 21 of the roller body 2. The jacket chambers 21A extend in the longitudinal direction (axial direction) and contain a gas-liquid two-phase heat medium. The surface temperature of the shell portion 21 is made uniform by utilizing the latent heat transfer of the gas-liquid two-phase heat medium contained in the jacket chambers 21A.

[0057] The induction heating mechanism 3 has: a cylindrical core 31 in a cylindrical shape; an induction coil 32 wound on the outer peripheral surface of the cylindrical core 31; and support shafts 331 and 332 for supporting these components. The support shafts 331 and 332 are respectively provided at both ends of the cylindrical core 31. The support shafts 331 and 332 are respectively inserted into the inside of the journal shaft portion 222, and are supported by bearings 61 and 62 such as rolling bearings so as to be rotatable relative to the journal shaft portion 222. In this way, the induction heating mechanism 3 remains stationary relative to the roller body 2 inside the rotating roller body 2. A lead wire L1 is connected to the induction coil 32, and an AC power source (not shown) for applying an AC voltage is connected to the lead wire L1 via a power conditioning device (not shown).

[0058] When an AC voltage is applied to the induction coil 32 of the induction heating mechanism 3, an alternating magnetic flux is generated, which passes through the shell 21 of the roller body 2. The passage of the alternating magnetic flux generates an induced current in the shell 21, and the shell 21 generates Joule heat due to the induced current.

[0059] (Cooling Mechanism 7 of Induction Heat Generating Roller Device 100)

[0060] In addition, if Figure 1As shown, the induction heating roller device 100 of the present embodiment includes a cooling mechanism 7 for cooling the roller body 2 and the induction heating mechanism 3 using a gap X1 between the roller body 2 and the induction heating mechanism 3 .

[0061] The cooling mechanism 7 generates airflow in the gap X1 to cool the roller body 2 and the induction heating mechanism 3. The gas in this embodiment is the ambient gas of the installation space of the roller body 2, that is, air. Alternatively, the gas may be nitrogen or the like by making the ambient gas nitrogen or the like.

[0062] Specific cooling mechanism 7 Figure 1 As shown in FIG. 1 , the external air of the roller body 2 is introduced from one axial end of the substantially cylindrical gap X1 formed between the roller body 2 and the induction heating mechanism 3, and is discharged to the outside from the other axial end of the gap X1, thereby cooling the roller body 2 and the induction heating mechanism 3. Figure 1 The left and right directions of the paper are indicated by the arrows.

[0063] More specifically, the cooling mechanism 7 comprises: an inlet (air intake port) 71 formed on one axial end side of the roller body 2 and connected to the gap portion X1; an outlet (exhaust port) 72 formed on the other axial end side of the roller body 2 and connected to the gap portion X1; a suction mechanism 73 connected to the outlet 72 and sucking gas from the gap portion X1 from the outlet 72; and a spray supply mechanism 74 that supplies spray to the inlet 71.

[0064] The inlet 71 introduces the gas outside the roller body 2 into the gap X1. Figure 2 As shown, a plurality of introduction ports 71 are formed on the journal flange portion 221 at one axial end side. In addition, the introduction ports 71 are formed in the journal flange portion 221 at one axial end side at equal intervals in the circumferential direction. Each introduction port 71 is formed by a through hole formed in the journal flange portion 221 along the axial direction. The opening shape of the introduction port 71 of this embodiment is circular, and can also be various shapes such as oblong, elliptical, rectangular, and polygonal.

[0065] The outlet 72 guides the gas in the gap X1 to the outside of the roller body 2. Figure 3 As shown, a plurality of lead-out ports 72 are formed on the journal flange portion 221 at the other axial end side. In addition, the lead-out ports 72 are formed, for example, at equal intervals in the circumferential direction in the journal flange portion 221 at the other axial end side. Each lead-out port 72 is formed by a through hole formed in the axial direction on the journal flange portion 221. The opening shape of the lead-in port 71 of this embodiment is circular, and can also be various shapes such as oblong, elliptical, rectangular, and polygonal.

[0066] The suction mechanism 73 uniformly sucks gas from the plurality of outlets 72, in particular, Figure 4 As shown, the suction mechanism 73 includes: a head 731 as a stationary body provided on the stationary side in a manner covering the outlet 72; and a suction device 732 connected to the head 731 to suck the gas in the gap X1 from the outlet 72. In addition, in this embodiment, the head 731 and the suction device 732 are connected by a connecting pipe (connecting pipe) 734.

[0067] The head portion 731 is opposite to the outer side surface of the journal flange portion 221 where the outlet 72 is formed, and the head portion 731 is substantially annular in shape and is provided so as to surround the journal shaft portion 222 (see Figure 3 A head space X2 is formed on the side of the head 731 opposite to the journal flange portion 221, and the head space X2 is connected to the plurality of outlets 72. In addition, a connection port P1 for connecting a connection pipe 734 is formed on the head 731, and the head space X2 is connected to the connection port P1.

[0068] Furthermore, the head 731 is statically supported on the outer peripheral surface of the journal shaft portion 222 by means of the bearing 91. Thus, the head 731 is fixed on the static side in a manner that does not rotate together with the journal shaft portion 222. In addition, the head 731 is provided in the journal shaft portion 222 on the axial inner side than the base 52.

[0069] The suction device 732 sucks the gas in the gap portion X1 from the connection port P1 of the head portion 731 through the head space X2, and is, for example, an electric blower or blower, a suction pump, etc. The suction device 732 is arranged on the stationary side. In addition, the exhaust port P2 of the suction device 732 is connected to an exhaust pipe (not shown), and the exhaust port P2 of the exhaust pipe is arranged in, for example, an external space different from the installation space of the induction heating roller device 100 (for example, outdoors). In addition, the suction device 732 can also be arranged in the external space, and the suction device 732 arranged in the external space and the connection port P1 of the head portion 731 are connected by a connecting pipe 734. In addition, the suction device 732 can change the suction force by changing the rotation speed, so that the gas flow rate flowing through the gap portion X1 can be adjusted. In addition, a flow regulating mechanism such as a flow regulating valve can also be provided on the connecting pipe 734.

[0070] In addition, the suction mechanism 73 of the present embodiment is provided with a rotary sealing mechanism 733 between the head 731 on the stationary side and the shaft neck flange portion 221 on the rotating side. The rotary sealing mechanism 733 isolates the head space X2 of the head 731 from the outside air. Specifically, the rotary sealing mechanism 733 seals the inner circumference and the outer circumference of the head space X2, for example, having an annular sealing groove 733a formed on the outer side surface of the shaft neck flange portion 221, and a cylindrical insertion portion 733b provided on the side circumferential wall of the head 731 and inserted into the sealing groove 733a. Here, in order to completely isolate, the rotary sealing mechanism 733 may be a contact sealing mechanism, but may also be a non-contact sealing mechanism that allows some outside air to flow in.

[0071] The spray supply mechanism 74 supplies a mist-like cooling medium (spray) to the plurality of inlet ports 71, particularly Figure 5 As shown, a head 741 as a stationary body is provided on the stationary side so as to cover the introduction port 71 , and a mist generating device 742 is provided on the head 741 .

[0072] The head portion 741 is opposite to the outer side surface of the journal flange portion 221 where the introduction port 71 is formed, and the head portion 741 is in a substantially annular shape so as to surround the journal shaft portion 222 (see Figure 2 A head space X3 is formed on the surface side of the head portion 741 that faces the journal flange portion 221 , and the head space X3 is communicated with the plurality of introduction ports 71 .

[0073] Furthermore, an external air introduction port 741H for introducing external air into the head space X3 is formed in the head portion 741. The external air introduction port 741H introduces external air into the head space X3 by sucking the gas in the gap portion X1 by the suction mechanism 73.

[0074] Furthermore, the head 741 is statically supported on the outer peripheral surface of the journal shaft portion 222 by means of the bearing 92. Thus, the head 741 is fixed on the static side in a manner that does not rotate together with the journal shaft portion 222. In addition, the head 741 is provided on the journal shaft portion 222 closer to the axial inner side than the base 51.

[0075] The spray generating device 742 generates a spray of the cooling medium (water) in the head space X3 of the head 741 and supplies the spray to the inlet 71 , for example, using an injection valve (nozzle). Figure 2It is a structure with two spray generating devices 742, but they can also be respectively provided corresponding to one or more inlets 71. The more nozzles there are, the more efficiently the spray can be supplied to the inlet 71. In addition, the spray generating device 742 can be a 1-fluid method that generates spray by ejecting compressed water from the nozzle, or a 2-fluid method that generates spray by ejecting two fluids of compressed water and compressed air from the nozzle. In addition, the spray generating device 742 can change the amount of spray generated by changing the supply amount of water supplied to the nozzle by a flow regulating mechanism (such as a flow control valve), so that the supply amount of spray supplied to the gap portion X1 can be adjusted. In addition, the flow regulating mechanism is controlled by a control unit not shown. Using the spray supply mechanism 74, the cooling performance can be adjusted while keeping the gas flow rate flowing through the gap portion X1 constant.

[0076] As a specific example of adjusting the supply amount of the spray, the following method can be considered.

[0077] The induction heating roller device 100 of this embodiment is provided with a temperature sensor S1 at a portion inside the roller body 2 where condensation or condensation of the spray should be avoided. The portion where condensation or condensation of the spray should be avoided is, for example, the upstream peripheral surface (the peripheral surface on the side of the inlet 71) of the induction coil 32 which is most easily cooled, and this portion becomes the lowest temperature portion. In addition, the spray supply mechanism 74 adjusts the supply amount of the spray in such a manner that the dew point temperature of the wet gas in the gap portion X1 does not fall below the detection temperature of the temperature sensor S1. Specifically, the spray supply mechanism 74 adjusts the supply amount of the spray according to the detection temperature of the temperature sensor S1, for example, the supply amount of the spray is adjusted in such a manner that the dew point temperature of the wet gas in the gap portion X1 is higher than the detection temperature of the temperature sensor S1 by a predetermined temperature (for example, +2°C).

[0078] In order to further ensure that the dew point temperature is not lower than the temperature detected by the temperature sensor S1, the induction heating roller device 100 may be provided with a humidity sensor for detecting relative humidity or absolute humidity inside the roller body 2. Furthermore, the spray supply mechanism 74 adjusts the supply amount of the spray in such a manner that the dew point temperature of the wet gas in the gap portion X1 obtained based on the humidity detected by the humidity sensor is not lower than the temperature detected by the temperature sensor S1. In addition, the spray supply mechanism 74 may also adjust the supply amount of the spray based on the flow rate of the gas flowing through the gap portion X1.

[0079] In addition, the spray supply mechanism 74 of the present embodiment is provided with a rotary sealing mechanism 743 between the head 741 on the stationary side and the shaft neck flange portion 221 on the rotating side. The rotary sealing mechanism 743 isolates the head space X3 of the head 741 from the outside air except for the external air inlet. Specifically, the rotary sealing mechanism 743 seals the inner and outer peripheral sides of the head space X3, for example, having an annular sealing groove 743a formed on the outer side surface of the shaft neck flange portion 221, and a cylindrical insertion portion 743b provided on the side circumferential wall of the head 741 and inserted into the sealing groove 743a. Here, the rotary sealing mechanism 743 can be a contact sealing mechanism for complete isolation, but can also be a non-contact sealing mechanism that allows some external air to flow in.

[0080] In this structure, when suction is started by the suction device 732, the gas in the gap X1 is sucked from the outlet 72, and the external air around the roller body 2 is sucked into the gap X1 from the inlet 71. In addition, the spray is supplied to the gap X1 from the inlet 71. The spray supplied to the gap X1 increases the humidity of the gas flowing in from the inlet, thereby greatly increasing the specific heat of the gas, and vaporizes by contacting with the shell 21 of the roller body 2, etc., and the latent heat of vaporization at this time is taken from the shell 21. Then, the gas sucked from the inlet 71 and the unvaporized spray flow through the inside of the gap X1 and are discharged from the outlet 72.

[0081] Here, since the inlet 71 and the outlet 72 are respectively formed on the journal flange portion 221, the gas and spray flowing through the gap portion X1 do not flow between the journal shaft portion 222 and the support shafts 331, 332, and are therefore not restricted by the pressure loss of the gap between the journal shaft portion 222 and the support shafts 331, 332. In addition, since the bearing 62 is located axially outside the outlet 72, the high-temperature gas is discharged from the outlet 72 before hitting the bearing 62, which can avoid contact with the bearing 62, thereby suppressing the reduction in the life of the bearing 62.

[0082] In this embodiment, the following treatment is applied to the portion in contact with the external air sucked from the inlet 71. That is, the outer peripheral surface of the induction coil 32 in contact with the external air is coated with a heat-resistant insulating varnish such as a polyimide-based, silicone-based, or epoxy-based varnish. Specifically, the outer peripheral surface of the induction coil 32 is coated with a heat-resistant insulating varnish. In addition, the inner surface of the roller body 2 in contact with the external air is coated with a heat-resistant material. Specifically, the inner surface of the roller body 2 is coated with a heat-resistant paint or a rust-proof paint, or is subjected to a rust-proof electroplating treatment.

[0083] (Effects of this embodiment)

[0084] According to the induction heating roller device 100 of the above structure, since the introduction port 71 is formed in the journal flange portion 221 at one axial end side of the roller body 2, the gas flowing in from the introduction port 71 flows into the gap portion X1 from the introduction port 71 at one axial end side of the roller body 2 without passing through the gap between the journal shaft portion 222 of the roller body 2 and the support shaft 331 of the induction heating mechanism 3. In addition, since the outlet port 72 connected to the suction mechanism 73 is formed in the journal flange portion 221 at the other axial end side of the roller body 2, the gas flowing in from the introduction port 71 is discharged to the outside from the outlet port 72 at the other axial end side of the roller body 2 without passing through the gap between the journal shaft portion 222 of the roller body 2 and the support shaft 332 of the induction heating mechanism 3. In this way, at both axial ends of the roller body 2, there is no restriction due to the pressure loss in the gap between the journal shaft portion 222 of the roller body 2 and the support shafts 331, 332 of the induction heating mechanism 3. As a result, the flow rate of the gas flowing through the gap portion X1 can be increased, and the cooling performance can be improved.

[0085] Furthermore, since the spray is supplied to the introduction port 71 formed in the journal flange portion 221, the path for the spray to reach the shell portion 21 of the roller body 2 can be shortened, and the spray can be efficiently introduced into the shell portion 21 of the roller body 2. As a result, by increasing the humidity of the gas flowing in from the introduction port, the specific heat of the gas can be greatly increased, and the latent heat of vaporization can be efficiently taken away from the shell portion 21 of the roller body 2, thereby improving the cooling performance.

[0086] In addition, since the high-temperature gas heated by flowing through the gap portion X1 does not pass through the gap between the journal shaft portion 222 of the roller body 2 and the support shaft 332 of the induction heating mechanism 3, it can avoid contact with the bearing 62 provided on the journal shaft portion 222, and the reduction in the life of the bearing 62 can be suppressed.

[0087] However, sometimes, the roller body 2 (hot roller) is loaded with a load higher than the required operating temperature, and the roller temperature rises even if the power input is cut off. In this case, it is difficult to perform high-precision temperature control by cooling only by air circulation. Therefore, there is a method of performing ventilation cooling that slightly exceeds the heat supplied from the load, and inputting only the excess heat by induction heating, thereby controlling the desired temperature with high precision. When this control is performed, the cooling heat control by the above-mentioned air volume adjustment becomes effective.

[0088] Furthermore, even during cooling, in the case of load operation, it is extremely important to have uniform temperature distribution of the shell 21 of the roller body 2. Since the jacket chamber 21A in which the gas-liquid two-phase heat medium is sealed is formed on the shell 21 of the roller body 2, the temperature uniformity of the shell 21 of the roller body 2 in the axial direction during cooling operation can be improved.

[0089] Furthermore, since the journal flange portion 221 at the other axial end side is formed with a plurality of outlets 72, the mechanical strength of the journal portion can be ensured while reducing the suction resistance and uniformly sucking gas and spray from the circumferential direction of the gap portion. Furthermore, since the journal portion 22 at one axial end side is formed with a plurality of inlet ports 71, the mechanical strength of the journal portion 22 can be ensured while reducing the suction resistance and uniformly sucking gas and spray from the circumferential direction of the gap portion X1.

[0090] (Other variant embodiments)

[0091] In addition, the present invention is not limited to the above-mentioned embodiments.

[0092] For example Figure 6 and Figure 7 As shown, the head 731 of the suction mechanism and / or the head 741 of the spray supply mechanism 74 may be fixed to a stationary structure provided separately from the roller body 2 for stationary support. Figure 6 and Figure 7 Although an example is shown in which the heads 731 and 741 are fixed to the stationary structural parts, namely, the bearings 41 and 42 or the bases 51 and 52 via the fixing members 101 and 102 , the heads 731 and 741 may be fixed to other stationary structural parts.

[0093] Furthermore, in order to promote turbulence in the gap X1, a turbulence promoting structure may be provided on the inlet 71. Figure 8 As shown in (A), it is possible to consider that the inlet 71 is obliquely penetrated in the journal flange portion 221 in the circumferential direction. That is, the inlet is formed in a manner that the outer opening and the inner opening of the inlet are staggered in the circumferential direction. In this way, the gas introduced into the gap portion X rotates and flows along the inner surface of the shell portion 21. In addition, as Figure 8 As shown in (B), a blade 711 for promoting turbulence may be provided on the inlet 71. In this way, the gas introduced into the gap X forms a plurality of spiral flows in the circumferential direction.

[0094] In addition, an air flow amplifier that supplies compressed gas from a compressed gas source and sucks the gas from a discharge port can be used as the suction device 732. According to this structure, when the installation site of the induction heating roller device 100 in a factory or the like has a compressed gas source, it is not necessary to prepare a separate blower or fan.

[0095] In addition, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the inventive concept of the present invention.

Claims

1. An induction heating roller device, characterized in that: include: A hollow roller body; an induction heating mechanism disposed in the hollow and causing the roller body to be induction heated; and a cooling mechanism for cooling the roller body and / or the induction heating mechanism by utilizing a gap between the roller body and the induction heating mechanism, The cooling mechanism comprises: An inlet is formed at one axial end of the roller body and communicates with the gap; A guide port formed at the other axial end of the roller body and communicating with the gap; A suction mechanism that sucks gas from the gap through the outlet; and a spray supply mechanism for supplying spray to the introduction port, The introduction port is formed on a journal flange portion at one axial end side of the roller body. The guide port is formed on a journal flange portion at the other axial end side of the roller body. The spray supply mechanism includes: a head portion provided on the stationary side so as to cover the introduction port; and a spray generating device provided on the head portion, The aerosol generating device generates the aerosol in the head portion and supplies the aerosol to the introduction port.

2. The induction heating roller device according to claim 1, characterized in that: A plurality of the introduction ports are formed on a journal flange portion at one axial end of the roller body, and / or A plurality of the lead-out ports are formed in a journal flange portion on the other axial end side of the roller body.

3. The induction heating roller device according to claim 1, characterized in that: The head portion has an external air introduction port for introducing external air into a head space of the head portion.

4. The induction heating roller device according to claim 3, characterized in that: The spray supply mechanism further includes a rotary seal mechanism provided between the head and a journal flange portion at one axial end of the roller body and isolating the head space from external air except for the external air introduction port.

5. The induction heating roller device according to claim 1, characterized in that: The head portion is stationarily supported on the outer peripheral surface of the journal shaft portion of the roller body via a bearing.

6. The induction heating roller device according to claim 1, characterized in that: The head is stationarily supported by being fixed to a stationary structure provided separately from the roller body.

7. The induction heating roller device according to claim 1, characterized in that: The cooling mechanism adjusts the flow rate of the gas flowing through the gap portion.

8. The induction heating roller device according to claim 1, characterized in that: A temperature sensor for detecting the temperature of the lowest temperature portion inside the roller body is further provided. The spray supply mechanism adjusts the supply amount of the spray so that the dew point temperature of the wet gas in the gap portion does not fall below the temperature of the lowest temperature portion.

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