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, and a first zone adjacent the first end portion with a constant pitch. The resistance coil further defines a continuously variable pitch extending along a length of the resistance coil from the first zone to the second end portion. The continuously variable pitch provides a variable watt density such that a predetermined temperature profile is provided along the sheath.
Claims20
A resistance element for use in a heater comprising:
- a resistance coil having a first end portion and a second end portion, the resistance coil defining:
- a first zone adjacent the first end portion, the first zone defining a constant pitch;
- and
- a continuously variable pitch extending from the first zone along a length of the resistance coil to the second end portion,
- wherein the continuously variable pitch provides a variable watt density such that a predetermined temperature profile is provided to a heating target.
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, the resistance coil assembly comprising:
- a resistance coil having a first end portion and a second end portion, the resistance coil defining:
- a first zone adjacent the first end portion, the first zone defining a constant pitch, and
- a continuously variable pitch extending from the first zone along a length of the resistance coil to the second end portion;
- 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 having a first end portion and a second end portion, the resistance coil defining:
- a first zone adjacent the first end portion, the first zone defining a constant pitch, and
- a continuously variable pitch extending from the first zone along a length of the resistance coil to the second end portion;
- 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.
Dependencies are inferred from the claim text.