Ribbon Resistance Heater Layout to Prevent Shell Shorting
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Solution Overview
Problem
Close quarter resistance heaters face issues with short circuiting due to migration of resistance wire elements and high manufacturing costs, primarily because of the need for precise insulation to prevent contact between the wires and the heater structure.
Innovation Solution
A close quarter electric resistance heater design featuring a ribbon heater element with a sinusoidal pattern mounted between insulating support segments, where the ribbon element's edges are narrower than its faces, minimizing movement towards the heater shell and eliminating the need for insulation between the ribbon and the shell, using a cylindrical shell with y-shaped connectors to maintain spacing and secure the segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistance wire is used in close quarter heater, then heating function is achieved, but wire migration causes short circuiting
Solution Approach 1:
The heater element is segmented into multiple discrete resistance wires that are individually positioned and secured within separate bores of insulators, rather than using a continuous wire. This segmentation prevents migration-induced short circuits by confining each wire segment to its own insulated pathway.
Solution Approach 2:
Insulators with bores are introduced as intermediary components between the resistance wires and the heater shell. These insulators physically separate the wires from conductive surfaces and from each other, preventing short circuiting while allowing the wires to maintain stable positions.
2Reliability
If insulators are precisely formed and arranged to prevent short circuiting, then reliability improves, but manufacturing cost increases
Solution Approach 1:
Multiple functions are merged into the insulator components: they provide electrical insulation, structural support for wire positioning, and mechanical attachment to the heater shell. This consolidation reduces the number of separate parts needed and simplifies manufacturing while maintaining reliability.
Solution Approach 2:
The insulators serve multiple purposes simultaneously: isolating resistance wires from the shell, spacing wires apart from each other, providing bores for wire insertion, and serving as mounting points for securing wires. This multi-functionality reduces overall component count and manufacturing complexity.
3Reliability
If insulation is added between support and resistance wire to prevent short circuiting, then reliability improves, but device complexity increases
Solution Approach 1:
The insulation function is extracted and integrated directly into the support structure itself through the insulator bores, rather than adding separate insulation layers or materials between the wires and support. This eliminates additional components while maintaining the short circuit prevention function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces the likelihood of short circuiting and lowers manufacturing costs by allowing the ribbon heater to be closely spaced to the heater wall without additional insulation, maintaining efficient heating performance while being economical to produce.
Implementation Method 1
electric resistance heater
Data Source
AI summary
A close quarter electric resistance heater comprises a ribbon heater element that is woven between ribbon support segments and within a heater shell. The ribbon support segments form an annulus on each end of the heater and are linked to each other using connectors. The connectors space the ribbon support segments apart from each other to facilitate the weaving of the ribbon element along the inside of the heater shell for heating purposes. The connectors also link the ribbon support segments to the shell. The ribbon heater element has faces that are wider than its edges and the ribbon heater element is woven on the support segments such that the edges face the heater shell. This configuration minimizes the migration of the ribbon heater element towards the shell and possible short circuiting of the heater.