Induction heating roller device

The induction heating roller apparatus uses magnetic bearings and a two-phase heating medium with cooling fluid channels to enhance support stability and temperature uniformity, addressing issues of wear and flux restrictions in existing designs.

DE112010002615B4Active Publication Date: 2025-07-31TOKUDEN CO LTD
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Patent Information

Application Number
DE112010002615
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2010-04-13
Publication Date
2025-07-31
Estimated Expiration
2030-04-13

AI Technical Summary

Technical Problem

Existing induction heating roller apparatuses face issues with support stability and uniform temperature distribution due to wear in rolling bearings and magnetic flux restrictions caused by magnetic bearings, leading to uneven temperature and instability.

Method used

The apparatus employs magnetic bearings to support the rotary shaft, integrates a shell chamber with a two-phase heating medium for axial temperature equalization, and incorporates cooling fluid channels to stabilize the magnetic bearings, with the rear bearing positioned outside the roller body for enhanced support stability.

Benefits of technology

This configuration improves support stability and ensures uniform temperature distribution across the roller body, reducing wear and instability, while allowing for rapid rotation and easy maintenance.

✦ Generated by Eureka AI based on patent content.

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Abstract

An induction heating roller device (100), comprising: a hollow cylindrical roller body (2) provided with a bottom, which comprises an axially extending jacket chamber (21A) in which a two-phase heating medium having a gas and liquid phase is enclosed; a rotary shaft (3) arranged at the bottom center of the roller body (2) along the rotation axis of the roller body (2); and a support body (4) into which the rotary shaft (3) is inserted, which is arranged in the space between the roller body (2) and the rotary shaft (3), and which is provided with a magnetic flux generating device (5) comprising a hollow cylindrical iron core (51) and an induction coil (52) wound around this hollow cylindrical iron core (51); characterized by: radial magnetic bearings (6, 7), each having a magnetic pole portion (6a, 6b;7a, 7b) arranged on an inner surface of the support body (4) opposite the outer surface of the rotary shaft (3), wherein the radial magnetic bearings (6, 7) support the rotary shaft (3) on its front side and its rear side in a contactless manner in the radial direction; wherein the front radial magnetic bearing (6) is arranged in front of the magnetic flux generating device (5) within the roller body (2), and the rear radial magnetic bearing (7) is arranged outside the roller body (2);
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Claims

[1] Induction heating roller device (100), comprising: a hollow cylindrical roller body (2) provided with a bottom, which comprises an axially extending jacket chamber (21A) in which a two-phase heating medium with gas and liquid phases is enclosed; a rotary shaft (3) arranged at the bottom center of the roller body (2) along the rotation axis of the roller body (2); and a support body (4) into which the rotary shaft (3) is inserted, which is arranged in the space between the roller body (2) and the rotary shaft (3), and which is provided with a magnetic flux generating device (5) which has a hollow cylindrical iron core (51) and an induction coil (52) wound around this hollow cylindrical iron core (51); characterized by : radial magnetic bearings (6, 7), each having a magnetic pole portion (6a, 6b; 7a, 7b) arranged on an inner surface of the support body (4) opposite the outer surface of the rotary shaft (3), wherein the radial magnetic bearings (6, 7) support the rotary shaft (3) at its front side and its rear side in a contactless manner in the radial direction; wherein the front radial magnetic bearing (6) is arranged in front of the magnetic flux generating device (5) within the roller body (2), and the rear radial magnetic bearing (7) is arranged outside the roller body (2). [2] Induction heating roller device (100), comprising: a hollow cylindrical roller body (2) provided with a bottom, which comprises an axially extending jacket chamber (21A) in which a two-phase heating medium with gas and liquid phases is enclosed; a rotary shaft (3) arranged at the bottom center of the roller body (2) along the rotation axis of the roller body (2); and a support body (4) into which the rotary shaft (3) is inserted, which is arranged in the space between the roller body (2) and the rotary shaft (3), and which is provided with a plurality of magnetic flux generating devices (5) which have a hollow cylindrical iron core (51) and an induction coil (52) wound around this hollow cylindrical iron core (51); characterized by : radial magnetic bearings (6, 7), each having a magnetic pole portion (6a, 6b; 7a, 7b) arranged on an inner surface of the support body (4) opposite the outer surface of the rotary shaft (3), wherein the radial magnetic bearings (6, 7) support the rotary shaft (3) at its front side and its rear side in a contactless manner in the radial direction; wherein the front radial magnetic bearing (6) is arranged between two of the magnetic flux generating devices (5) within the roller body (2), and the rear radial magnetic bearing (7) is arranged outside the roller body (2). [3] Induction heating roller device (100) according to claim 1 or 2, wherein the roller body (2) and the rotary shaft (3) are integrally formed. [4] Induction heating roller device (100) according to one of claims 1 to 3, wherein in a portion of the support body (4) in which the radial magnetic bearings (6, 7) are provided, a cooling fluid channel (4A) is formed through which a cooling fluid flows.

Citation Information

Patent Citations

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    DE69517175T2

  • Godet

    JP2004526884A

  • Godet

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  • Induction heating roller device

    JP2007321792A

  • Cantilever-type induction heating roller apparatus

    JP2009163968A