Ceramic Insulator Design for Electric Heating Element Oxide Management
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Solution Overview
Problem
Conventional electric heating devices in industrial furnaces face issues with element failure due to gravitational accumulation of melted metal and metal oxide, leading to short circuits and restricted mounting options, and inadequate prevention of electric leakage.
Innovation Solution
The electric heating device incorporates a radiant tube with parallel heater wires supported by a heater fixing shaft with ceramic insulators, where the ceramic insulators are designed with a reduced outer diameter and specific shapes to minimize contact and oxide accumulation, featuring recessed grooves and stepped portions to direct oxide discharge and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective insert is disposed between the radiant tube and the heating element to prevent damage from melted metal, then the radiant tube is protected, but the device requires horizontal mounting which restricts installation flexibility
Solution Approach 1:
The patent removes the protective insert component entirely and replaces it with a ceramic insulator that performs multiple functions: electrical insulation, mechanical support, and prevention of metal oxide accumulation. This extraction eliminates the need for horizontal mounting while maintaining protection against element failure.
Solution Approach 2:
The ceramic insulator serves multiple functions simultaneously: it provides electrical insulation between the heating element and radiant tube, supports the heating element structurally, and prevents metal oxide accumulation through its specific geometric design. This multi-functionality replaces the single-purpose protective insert.
2Reliability
If the outer diameter of the ceramic insulator is reduced to minimize contact with the radiant tube, then metal oxide chipping and accumulation is reduced, but the insulator's structural strength may be compromised
Solution Approach 1:
The ceramic insulator features non-uniform thickness with localized reinforcement: the central portion has greater thickness to provide mechanical strength and support, while the peripheral edges have reduced thickness to minimize contact area with the radiant tube and prevent metal oxide accumulation. This local quality variation resolves the contradiction between strength and short circuit prevention.
Solution Approach 2:
The patent uses ceramic material for the insulator, which provides both the necessary mechanical strength to support the heating element and the electrical insulation properties to prevent short circuits. The ceramic's inherent material properties allow the reduced-diameter design while maintaining structural integrity.
3Reliability
If the ceramic insulator is designed with minimal contact area to the radiant tube, then metal oxide accumulation is reduced, but the insulator's ability to support the heating element may be weakened
Solution Approach 1:
The ceramic insulator concentrates its support function at the central region where greater thickness provides mechanical strength for holding the heating element, while the reduced peripheral contact area prevents metal oxide accumulation. This local differentiation resolves the contradiction between support capability and element failure prevention.
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
This configuration reduces metal oxide chipping and accumulation, thereby minimizing short circuits and allowing stable long-term operation, while enabling vertical mounting and reducing the risk of electric leakage.
Implementation Method 1
a plurality of heater wires 14 disposed in the radiant tube 12 so as to be parallel to each other
Implementation Method 2
disk-shaped ceramic insulators 18 mounted to the heater fixing shaft 16 so as to support the heater wires 14
Implementation Method 3
a radiant tube 12 made of metal... in which an insulator such as a heater fixing shaft and a ceramic insulator, and a heater wire are stored in a radiant tube made of metal and protected from an external atmosphere
Data Source
AI summary
An electric heating device includes: a radiant tube made of metal; a plurality of heater wires disposed in the radiant tube so as to be parallel to each other; a heater fixing shaft disposed on a center axis line of the radiant tube, the heater fixing shaft having a surface covered by an insulator; and disk-shaped ceramic insulators mounted to the heater fixing shaft at predetermined intervals so as to support the heater wires. A center hole in which the heater fixing shaft is inserted penetrates through each ceramic insulator at a center thereof, and heater wire holding holes that are equally spaced on a circumference concentric with the center hole penetrate through each ceramic insulator.