Patent ID: 11913736
Assignee: WATLOW ELECTRIC MANUFACTURING COMPANY
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  H | IPC F

Claim 14:
15. A heater assembly comprising:
a flow guide defining a continuous geometric helicoid disposed about a longitudinal axis of the heater assembly, the flow guide defining a predetermined pattern of perforations that extend in a longitudinal direction through a first longitudinal length of the geometric helicoid, the longitudinal direction being parallel to the longitudinal axis, wherein the first longitudinal length is less than a full longitudinal length of the geometric helicoid such that the electrical resistance heating elements do not extend through a portion of the geometric helicoid that is farther in the longitudinal direction than the first longitudinal length; and
a plurality of electrical resistance heating elements extending through the perforations, at least one electrical resistance heating element of the plurality of electrical resistance heating elements includes a first region with a first watt density and a second region with a second watt density, the second region being located farther in the longitudinal direction than the first region, the second watt density being less than the first watt density, and wherein the second region includes an end portion of the electrical resistance heating element, wherein the geometric helicoid extends, in the longitudinal direction, beyond the end portion.