Variable pitch resistance coil heater

摘要

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.

主权项

1. 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.