Shield for a hot surface ignitor and method for fabricating a shield
AssigneeSurface Igniter LLC
InventorPeter T. B. Shaffer
Life of this patent
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Abstract
An ignitor assembly includes a hot surface ignitor of a resistance material and a super alloy shield surrounding the ignitor. The shield comprises a longitudinally extending cylindrically shaped super alloy sheet having a plurality of first and second alternating transverse strips. The strips are formed by making a plurality of transverse slits or cuts in a flat sheet of super alloy material. The first alternating strips are bowed outwardly in a first direction and the second alternating strips are bowed outwardly in an opposite direction to thereby form a cage like cylindrical structure which forms a part of the ignitor assembly. The ignitor generally includes a base portion and is inserted into the cage like structure.
Claims4
A hot surface ignitor assembly including a hot surface ignitor and a longitudinally extending generally cylindrically shaped super alloy shield extending around said ignitor, said ignitor comprising an elongated hollow body composed of a non-metallic resistance material and having a first portion comprising a pair of laterally spaced elongated members having inner and outer surfaces and a second portion comprising a pair of spaced helical bands connected to and extending longitudinally from said elongated members respectively and terminating in an end portion, a coating of electrically conductive material disposed on one of said surfaces of each of said elongated members remote from said helical bands, and said shield comprising a longitudinally extending cylindrically shaped super alloy metal sheet having a plurality of odd and even alternate transverse strips formed by a plurality of transverse slits, and a longitudinally extending metal wall portion integral with said strips and wherein said odd alternate transverse strips are bowed outwardly in a first direction and wherein said even alternate strips are bowed outwardly in an opposite direction to thereby form a longitudinally extending cylindrical shield between said strips with said ignitor disposed within said cylindrical shield and means for fixing said shield to said ignitor.
Dependencies are inferred from the claim text.