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US 7,006,552 B2Granted
Resistance furnace with tubular heating element
AssigneeHeraeus Tenevo GmbH
InventorsThomas Bogdahn, Oliver Ganz
Life of this patent
Estimating the term…
Abstract
A resistance furnace has a tubular heating element with a vertically-oriented longitudinal axis. The heating element has a shell surface defined by an upper side and a lower side and surrounding a furnace chamber. The heating element is connected to at least two supply terminals by which heating current is introduced at power supply points into the heating element. The supply terminals include a surrounding upper annular collar adjacent the upper side of the shell surface, and also a surrounding lower annular collar adjacent the lower side of the shell surface.
Claims42
A resistance furnace comprising:
- a tubular heating element having a vertically oriented longitudinal axis, said heating element having a shell surface defined by an upper side and a lower side and surrounding a furnace chamber, and being connected to at least two supply terminals by means of which heating current is introduced at power supply points into said heating element, wherein said supply terminals comprise a surrounding upper annular collar adjacent said upper side and a surrounding lower annular collar adjacent said lower side, wherein regions of lower electrical conductivity are formed in said annular collars for branching the supplied heating current into at least four current paths leading to favored power supply points uniformly distributed over a circumference of said heating element, and wherein said power supply points of said upper annular collar are offset circumferentially relative to said power supply points of said lower annular collar.
A resistance furnace comprising:
- a tubular heating element having a vertically oriented longitudinal axis, said heating element having a shell surface defined by an upper side and a lower side and surrounding a furnace chamber, and being connected to at least two supply terminals by means of which heating current is introduced at power supply points into said heating element, wherein said supply terminals comprise a surrounding upper annular collar adjacent said upper side and a surrounding lower annular collar adjacent said lower side, and wherein each of said annular collars comprises an electrode terminal feeding said heating current, and wherein said electrode terminal of said upper annular collar is offset circumferentially relative to said electrode terminal of said lower annular collar.
A resistance furnace comprising:
- a tubular heating element having a vertically oriented longitudinal axis, said heating element having a shell surface defined by an upper side and a lower side and surrounding a furnace chamber, and being connected to at least two supply terminals by means of which heating current is introduced at power supply points into said heating element, wherein said supply terminals comprise a surrounding upper annular collar adjacent said upper side and a surrounding lower annular collar adjacent said lower side, and wherein the heating element has an outside and an interior, and the interior of said heating element is sealed to the outside by means of quartz wool.
A resistance furnace comprising:
- a tubular heating element having a vertically oriented longitudinal axis, said heating element having a shell surface defined by an upper side and a lower side and surrounding a furnace chamber, and being connected to at least two supply terminals by means of which heating current is introduced at power supply points into said heating element, wherein said supply terminals comprise a surrounding upper annular collar adjacent said upper side and a surrounding lower annular collar adjacent said lower side, and wherein gas flushing is provided by a system which comprises a gas inlet which is branched in at least one branch stage, into a plurality of secondary lines of equal pressure loss, said secondary lines terminating in a plurality of gas outlets which are uniformly distributed over an envelope circle and directed into said furnace chamber.
A resistance furnace comprising:
- a tubular heating element having a vertically oriented longitudinal axis, said heating element having a shell surface defined by an upper side and a lower side and surrounding a furnace chamber, and being connected to at least two supply terminals by means of which heating current is introduced at power supply points into said heating element, wherein said supply terminals comprise a surrounding upper annular collar adjacent said upper side and a surrounding lower annular collar adjacent said lower side, and wherein regions of lower electrical conductivity are formed in said annular collars for branching the supplied heating current into at least four current paths leading to favored power supply points uniformly distributed over a circumference of said heating element, and wherein said annular collars have a first surrounding cooling channel having a first coolant inlet.
Dependencies are inferred from the claim text.