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US 8,525,084 B2Granted
Electrical heating element
AssigneeHeat Trace Limited
InventorJason Daniel Harold O'Connor
Life of this patent
Estimating the term…
Abstract
An electrical device includes a compound material. The compound material includes a mixture of an electrically conductive material and an electrically insulative material. The conductive material is aligned within the compound material, such that the resistivity of the compound material in a first direction is different from the resistivity of the compound material in a second direction perpendicular to the first direction.
Claims25
A parallel resistance heating cable comprising:
- a heating element;
- a longitudinal axis extending along the cable;
- and
- two power supply conductors extending parallel to the longitudinal axis, the two power supply conductors defining a plane,
- the heating element extending along the cable and between the power supply conductors, and connected in parallel between the power supply conductors;
- the heating element comprising a compound material, the compound material comprising a mixture of an electrically conductive material and an electrically insulative material, the electrically conductive material comprising a plurality of agglomerates or particles;
- wherein the agglomerates or particles are orientated or distributed within a first portion of the heating element extending between the two power supply conductors such that the resistivity of the first portion of the heating element in a first direction parallel to the longitudinal axis is lower than the resistivity of the first portion of the heating element in a second direction substantially perpendicular to the longitudinal axis and substantially perpendicular to the plane of the two power supply conductors;
- wherein the agglomerates or particles are orientated or distributed within the first portion of the heating element extending between the two power supply conductors by the application of a predetermined pressure to the first portion of heating element in the second direction.
5 more elements
A method of manufacturing a parallel resistance heating cable, the method comprising:
- providing a compound material comprising a mixture of an electrically conductive material and an electrically insulative material, the electrically conductive material comprising a plurality of agglomerates or particles;
- providing two power supply conductors extending parallel to a longitudinal axis of the parallel resistance heating cable, the power supply conductors defining a plane;
- substantially surrounding the power supply conductors with the compound material such that the power supply conductors and compound material are in electrical communication, the compound material forming a heating element;
- and
- applying a predetermined pressure to a first portion of the heating element extending between the two power supply conductors so as to orientate or distribute the agglomerates or particles within the first portion of the heating element such that the resistivity of the compound material within the first portion of the heating element in a first direction parallel to the longitudinal axis is lower than the resistivity of the compound material in a second direction, wherein the predetermined pressure is applied in the second direction and wherein the second direction is substantially perpendicular to the longitudinal axis and to the plane of the power supply conductors.
2 more elements
A series resistance heating cable comprising:
- a longitudinal axis extending along the cable;
- a heating element extending along the longitudinal axis, the heating element comprising a compound material, the compound material comprising a mixture of an electrically conductive material and an electrically insulative material, the electrically conductive material comprising a plurality of agglomerates or particles;
- wherein the agglomerates or particles are orientated or distributed within the heating element such that the resistivity of the first portion of the heating element in a first direction parallel to the longitudinal axis is lower than the resistivity of the first portion of the heating element in a second direction substantially perpendicular to the longitudinal axis;
- and
- wherein the agglomerates or particles are orientated or distributed within the heating element by the application of a predetermined pressure to the heating element in the second direction.
2 more elements
A method of manufacturing a series resistance heating cable, the method comprising:
- providing a compound material comprising a mixture of an electrically conductive material and an electrically insulative material, the electrically conductive material comprising a plurality of agglomerates or particles;
- forming a heating element along a longitudinal axis using the compound material;
- and
- applying a predetermined pressure to the heating element during the forming of the heating element so as to orientate or distribute the agglomerates or particles within the heating element such that the resistivity of the compound material within the heating element in a first direction parallel to the longitudinal axis is lower than the resistivity of the compound material in a second direction substantially perpendicular to the longitudinal axis;
- wherein the predetermined pressure is applied in the second direction substantially perpendicular to the longitudinal axis.
2 more elements
Dependencies are inferred from the claim text.