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US 5,844,213 AGranted
Induction heating coil assembly for prevention of circulating currents in induction heating lines for continuous-cast products
AssigneeInductotherm Corp.
InventorsVitaly Peysakhovich, Edward Rylicki
Life of this patent
Estimating the term…
Abstract
An induction heating coil assembly for use in a roller induction heating line has a magnetic shunt for receiving a portion of an electromagnetic field generated along the axis of the induction coil and directing that portion along a path parallel to a workpiece passing along the heating line. This flux path ensures that eddy currents induced in the workpiece flow primarily perpendicular to the axis of the workpiece, and not along the axis of the workpiece where they could cause arcing between the moving workpiece and the conveyor rolls.
Claims47
An induction heating apparatus for a sheet, slab or bar workpiece having a longitudinal axis, comprising:
- a coil apparatus comprising first and second elongated induction segments each having first and second ends, said first and second elongated induction segments being arranged substantially parallel to each other and extending across opposite surfaces of a workpiece transverse to said longitudinal axis,
- third and fourth elongated induction segments, each having first and second ends respectively,
- said first and second elongated segments being connected at their first ends by first and second linking induction segments to the first end of the third and fourth elongated induction segments respectively, said third and fourth elongated induction segments being arranged substantially parallel to each other and extending across opposite surfaces of the workpiece, transverse to said longitudinal axis, said third and fourth elongated segments being connected to each other by a spanning segment on the second end opposite the first end,
- a gap between said first and second linking induction segments, said gap having a dimension sufficient to enable the workpiece to be passed edgewise between the induction segments for placement within the coil apparatus, such that the coil apparatus is adapted to be moved to selectably encompass and be removed from the workpiece;
- said induction heating apparatus further comprising a plurality of magnetic yokes disposed on a surface of the first, second, third and fourth induction segments respectively, said surface being that surface facing away from the workpiece, said magnetic yokes being arranged parallel to and spaced apart from each other and parallel to the longitudinal axis of the workpiece, said magnetic yokes extending along each of said first through fourth elongated segments for a distance at least equal to the width of the workpiece;
- and a magnetic field reducer located within the gap between the linking induction segments to restrict magnetic flux outside the induction apparatus.
3 more elements
An induction heating apparatus for heating strip material comprising
- a coil apparatus comprising a first elongated induction segment having first and second ends, a first linking induction segment having length l.sub.1 connected to said first elongated induction segment at its first end and coplanar with said first segment, forming substantially a right angle at the connection,
- a second elongated induction segment having first and second ends arranged parallel to and spaced apart from the first elongated segment by the length l.sub.1 of the first linking induction segment, said second elongated segment being connected at its first end to the first linking segment at substantially a right angle and coplanar with said linking segment,
- a third elongated induction segment having first and second ends, said third elongated segment being connected at its first end to the second end of the second elongated segment by a spanning segment, said spanning segment being arranged substantially perpendicular to a plane extending through both the first and second elongated segments, said third elongated segment being arranged substantially parallel to the second elongated segment and separated from it by a gap of distance l.sub.2,
- a second linking segment connected to the second end of the third elongated segment, said second linking segment being arranged parallel to the first linking segment, said second linking segment being separated from the first linking segment by a gap of distance l.sub.2,
- a fourth elongated induction segment having first and second ends, said fourth elongated segment being connected at its first end to the second linking segment at substantially a right angle to said linking segment, said fourth elongated segment being arranged parallel to the first elongated segment and separated from it by a gap of distance l.sub.2 ;
- said induction heating apparatus further comprising a plurality of magnetic yokes disposed on a surface of the first, second, third and fourth elongated induction segments respectively, said surface being that surface facing away from the gap between the first and fourth and the second and third elongated segments respectively, said magnetic yokes being arranged parallel to and spaced apart from each other and parallel to the linking segments of the apparatus, said plurality of magnetic yokes extending along the elongated dimension of each of said first through fourth elongated segments;
- and a magnetic field reducer located within the gap between the linking segments to restrict magnetic flux outside the induction apparatus.
4 more elements
An induction heating apparatus for heating strip material comprising
- a coil apparatus comprising a plurality of elongated induction segments and a plurality of linking segments, said elongated segments being arranged in substantially parallel pairs and having first and second ends, each of the respective elongated segments in each pair being arranged parallel to each other and having a gap between them, said parallel pairs of induction segments being connected at their first ends by parallel linking segments such that the linking segments are also separated from each other by a gap,
- each pair of elongated induction segments except one being connected at their respective second ends by a short spanning segment, said one pair being connected at its respective second ends to an alternating current power supply;
- said induction heating apparatus further comprising a plurality of magnetic yokes disposed on a surface of each of the plurality of respective elongated induction segments, said surface being that surface facing away from the gap, said magnetic yokes being arranged parallel to and spaced apart from each other and parallel to the linking segments, said plurality of magnetic yokes extending along the elongated dimension of each of said plurality of elongated induction segments;
- and a magnetic field reducer located within the gap between the linking segments to restrict magnetic flux outside the induction apparatus.
1 more element
An induction heating apparatus for a sheet, slab or bar workpiece having a longitudinal axis, comprising:
- a coil apparatus comprising first and second elongated induction segments each having first and second ends, said first and second elongated induction segments being arranged substantially parallel to each other and extending across opposite surfaces of a workpiece transverse to said longitudinal axis,
- third and fourth elongated induction segments each having first and second ends respectively,
- said first and second elongated segments being connected at their first ends by first and second linking induction segments to the first end of the third and fourth elongated induction segments respectively, said third and fourth elongated induction segments being arranged substantially parallel to each other and extending across opposite surfaces of the workpiece, transverse to said longitudinal axis, said third and fourth elongated segments being connected to each other by a spanning segment on the second end opposite the first end,
- a gap between said first and second linking induction segments, said gap having a dimension sufficient to enable the workpiece to be passed edgewise between the induction segments for placement within the coil apparatus, such that the coil apparatus is adapted to be moved to selectably encompass and be removed from the workpiece;
- said induction heating apparatus further comprising a magnetic field reducer located within the gap between the linking induction segments to restrict magnetic flux outside the induction apparatus.
2 more elements
An induction heating apparatus for heating strip material comprising
- a coil apparatus comprising a first elongated induction segment having first and second ends, a first linking induction segment having length l.sub.1 connected to said first elongated induction segment at its first end and coplanar with said first segment, forming substantially a right angle at the connection,
- a second elongated induction segment having first and second ends arranged parallel to and spaced apart from the first elongated segment by the length l.sub.1 of the first linking induction segment, said second elongated segment being connected at its first end to the first linking segment at substantially a right angle and coplanar with said linking segment,
- a third elongated induction segment having first and second ends, said third elongated segment being connected at its first end to the second end of the second elongated segment by a spanning segment, said spanning segment being arranged substantially perpendicular to a plane extending through both the first and second elongated segments, said third elongated segment being arranged substantially parallel to the second elongated segment and separated from it by a gap of distance l.sub.2,
- a second linking segment connected to the second end of the third elongated segment, said second linking segment being arranged parallel to the first linking segment, said second linking segment being separated from the first linking segment by a gap of distance l.sub.2,
- a fourth elongated induction segment having first and second ends, said fourth elongated segment being connected at its first end to the second linking segment at substantially a right angle to said linking segment, said fourth elongated segment being arranged parallel to the first elongated segment and separated from it by a gap of distance l.sub.2 ;
- said induction heating apparatus further comprising a magnetic field reducer located within the gap between the linking segments to restrict magnetic flux outside the induction apparatus.
3 more elements
An induction heating apparatus for heating strip material comprising
- a coil apparatus comprising a plurality of elongated induction segments and a plurality of linking segments, said elongated segments being arranged in substantially parallel pairs and having first and second ends, each of the respective elongated segments in each pair being arranged parallel to each other and having a gap between them, said parallel pairs of elongated induction segments being connected at their first ends by parallel linking segments such that the linking segments are also separated from each other by a gap,
- each pair of elongated induction segments except one being connected at their second ends by a short spanning segment, said one pair being connected at its respective second ends to an alternating current power supply;
- said induction heating apparatus further comprising a magnetic field reducer located within the gap between the linking segments to restrict magnetic flux outside the induction apparatus.
Dependencies are inferred from the claim text.