Variable pitch resistance coil heater
AssigneeWatlow Electric Manufacturing Company
InventorsDennis P. Long, Rolando O. Juliano
Life of this patent
Estimating the term…
Abstract
A heater is provided that includes a resistance coil assembly defining a first end portion having a first conducting pin and a second end portion having a second conducting pin, and a resistance coil disposed between the first end portion and the second end portion, the resistance coil defining a plurality of different pitches between the first end portion and the second end portion. An insulating material surrounds the resistance coil assembly, and a sheath surrounds the insulating material. The plurality of different pitches provide a variable watt density such that a predetermined temperature profile is provided along the sheath.
Claims13
A heater comprising:
- a resistance coil assembly defining a first end portion having a first conducting pin and a second end portion having a second conducting pin, and a resistance coil disposed between the first end portion and the second end portion, the resistance coil having a continuously variable pitch along the length of the resistive coil between the first and second end portions;
- an insulating material surrounding the resistance coil assembly;
- and
- a sheath surrounding the insulating material,
- wherein the continuously variable pitch provides a variable watt density such that a predetermined temperature profile is provided along the sheath.
An electric heat exchanger comprising:
- a heater comprising:
- a resistance coil assembly defining a first end portion having a first conducting pin and a second end portion having a second conducting pin, and a resistance coil disposed between the first end portion and the second end portion, the resistance coil having a continuously variable pitch along the length of the resistive coil between the first and second end portions;
- an insulating material surrounding the resistance coil assembly;
- and
- a sheath surrounding the insulating material,
- wherein the continuously variable pitch provides a variable watt density such that a predetermined temperature profile is provided along the sheath.
A resistance element for use in a heater comprising:
- a resistance body defining a coil shape having a first end portion and a second end portion, and the coil shape having a continuously variable pitch along the length of the resistive coil between the first and second end portions,
- wherein the continuously variable pitch provides a variable watt density such that a predetermined temperature profile is provided to a heating target.
Dependencies are inferred from the claim text.