Heating coil structures
AssigneeQuartz Tubing, Inc.
InventorsNorman Burstein, John Stein
Life of this patent
Estimating the term…
Abstract
A heating element formed from at least two wires twisted together. The twisted wires are preferably shaped in a helical configuration and mounted within a quartz tube.
Claims21
An electrical heater having a helix of coils of resistance wire characterized by each turn of the wire of said coils being formed of a plurality of wires twisted together in a plurality of twists, and electrical means, forming an electrical connection at each end of said twisted wires, for applying a source of electrical power across said helix via said connections, said twisted wires having a lay distance which between about 9 and 11 times greater than the individual diameter of said wires, said wires being in continuous contact along their respective lengths between said electrical connections, said heater helix being unsealed from the ambient.
Ana electrical heater of the type having coils of resistance wire in a tube, the heater characterized by a plurality of resistance wires twisted together in a plurality of twists and then formed into the coils, said twisted wires having a lay distance which is between about 9 and 11 times greater than the individual diameter of said wires.
An electrical element for a heater comprised of at least two high resistance conductors twisted about each other and being in continuous contact along their respective lengths, with first ends of the conductors electrically connected in a first common terminal and second ends of the conductors electrically connected in a second common terminal, said twisted high resistance conductors having a lay distance which is between about 9 and 11 times greater than the cross-sectional distance of said conductors and means for connecting said first and second common terminals in the energizing circuit of a heater.
A method of producing an electrical heater element which comprises:
- providing at least two electrical conductors;
- twisting the electrical conductors about each other such that the electrical conductors have a lay distance which is between about 9 and 11 times greater than the individual diameter of the conductors;
- and
- coiling the twisted conductors about a fixed axis.
A resistive heating element comprising:
- first and second resistance wires, said wires defining respective longitudinal axes and being disposed in continuous uninterrupted substantially mutually supporting contacting relation along said longitudinal axes, said first and second wires having a lay distance which is between about 9 and 11 times greater than the cross-sectional distance of said conductors.
An electrical heater comprising:
- a resistive heating element having first and second resistance wires defining respective longitudinal axes and being twisted in a substantially mutually supporting contacting relation along said longitudinal axes such that said resistive heating element has a lay distance which is between 9 and 11 times greater than the individual diameter of said first and second resistance wires;
- and
- electrical means, forming an electrical connection at each end of said twisted wires, for applying a source of electrical power across said helix through said connections.
A method of forming a resistive heating element comprising the steps of:
- providing first and second resistance wires defining respective longitudinal axes;
- and
- twisting said first and second resistance wires about one another into substantially mutually supporting contacting relation along said longitudinal axes such that said resistive heating element has a lay distance which is between about 9 and 11 times greater than the individual diameter of said first and second resistance wires.
Dependencies are inferred from the claim text.