Ceramic Igniter Zoning for Fast Heating and Break Resistance
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Solution Overview
Problem
Current ceramic igniters fail to meet performance requirements for rapid time-to-temperature and mechanical integrity, particularly in applications like instantaneous water heaters and gas cooktops, where they often break due to environmental impacts.
Innovation Solution
The development of ceramic resistive igniter elements with a first conductive zone, a resistive hot zone, and a second conductive zone in electrical sequence, where the first conductive zone does not contact a ceramic insulator, promoting rapid time-to-ignition and enhanced mechanical integrity through a rounded cross-sectional shape and segregated conductive zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional ceramic igniters are used, then they provide basic ignition function, but they exhibit slow time-to-temperature performance
Solution Approach 1:
The igniter is divided into distinct functional zones: a highly conductive zone for rapid electrical heating, a semi-conductive zone for controlled heat generation, and an insulative zone for thermal management. This segmentation allows each zone to perform its specific function optimally, achieving rapid time-to-temperature while maintaining reliable ignition performance.
Solution Approach 2:
Different portions of the igniter are given different electrical conductivity properties and thermal characteristics. The highly conductive zone near the ignition tip is designed for rapid heating, while other zones have different properties to control overall heat distribution. This local differentiation enables fast ignition response without compromising overall system reliability.
2Strength
If conventional ceramic igniters are used, then they provide structural support, but they suffer from breakage due to environmental impacts
Solution Approach 1:
The igniter employs a composite ceramic structure with multiple zones having different material compositions and properties. This composite design provides both mechanical strength for structural support and tailored thermal/electrical properties for ignition function, while the robust ceramic composition resists environmental impacts and breakage.
3Loss of time
If ceramic igniters contact ceramic insulators, then they provide electrical insulation, but they slow down the time-to-ignition temperature
Solution Approach 1:
The design extracts or removes the ceramic insulator from direct contact with the highly conductive zone. By eliminating this thermal barrier between the rapid-heating zone and the ignition tip, the system achieves faster time-to-ignition temperature while maintaining electrical insulation through alternative design arrangements, ensuring ignition reliability.
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 new igniter design achieves rapid time-to-temperature values of 3 seconds or less and improved mechanical robustness, suitable for high-voltage applications and demanding ignition systems like instantaneous water heaters and gas cooking units.
Implementation Method 1
a highly resistive 'hot zone' at the igniter tip with one or more conductive 'cold zones' providing to the hot zone from the opposing igniter end
Data Source
AI summary
New ceramic resistive igniter elements are provided that comprise a first conductive zone, a resistive hot zone, and a second conductive zone, all in electrical sequence. In preferred igniters, at least a substantial portion of the first conductive zone does not contact a ceramic insulator. Preferred igniters of the invention have a rounded cross-sectional shape for at least a portion of the igniter length.