Heating element unit
AssigneeChromalox, Inc.
InventorsPaul Neilson, Danen Lynn, Martin Konieczny
Life of this patent
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Abstract
A heating element unit for an electric resistance heater comprises: a casing; a heating element within the casing; and an electrical insulator between the heating element and the casing. In some embodiments, the electrical insulator comprises first and second layers, the second layer having a greater dielectric strength than the first layer, and the second layer having: a dielectric strength of greater than about 1500 kV/m (greater than about 40 V/mil). In some embodiments, the electrical insulator comprises an electrically-insulating granular material and has a dielectric strength greater than about 1500 kV/m (greater than about 40 V/mil).
Claims10
A heating element unit for an electric resistance heater, the heating element unit comprising:
- a casing;
- a heating element within the casing;
- and an electrical insulator between the heating element and the casing, wherein the electrical insulator is a non-metallic electrical insulator;
- wherein the electrical insulator comprises first and second layers, the second layer having a greater dielectric strength than the first layer, and the second layer having:
- a dielectric strength of greater than 1500 kV/m (greater than 40 V/mil);
- wherein the first layer is an inner layer and the second layer is an outer layer, or the first layer is an outer layer and the second layer is an inner layer;
- and wherein the inner layer is arranged radially inwards of the outer layer such that the outer layer surrounds the inner layer.
An electric resistance heater comprising a heating element unit, the heating element unit comprising:
- a casing;
- a heating element within the casing;
- and
- an electrical insulator between the heating element and the casing, wherein the electrical insulator is a non-metallic electrical insulator;
- wherein the electrical insulator comprises:
- first and second layers, the second layer having a greater dielectric strength than the first layer, and the second layer having a dielectric strength of greater than 1500 kV/m (greater than 40 V/mil);
- wherein the first layer is an inner layer and the second layer is an outer layer, or the first layer is an outer layer and the second layer is an inner layer;
- and wherein the
- inner layer is arranged radially inwards of the outer layer such that the outer layer surrounds the inner layer.
Dependencies are inferred from the claim text.