Ceramic Heater Uniform Temperature via High Conductivity Member
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Solution Overview
Problem
Conventional ceramic heaters exhibit non-uniform temperature distribution in the circumferential direction due to varying heat transfer rates, with high rates along the longitudinal direction of the heating element and low rates perpendicular to it.
Innovation Solution
Incorporating a high heat conductivity member with a ceramic base, where the member contacts opposing portions of the heating resistor and extends along the longitudinal direction, improving heat transfer to regions with lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional ceramic heater with a U-shaped heating element embedded in a ceramic base is used, then the heating element can generate heat effectively, but the temperature distribution in the circumferential direction of the ceramic base becomes non-uniform
Solution Approach 1:
A high heat conductivity member is introduced as an intermediary component between the heating element and the ceramic base. This member has thermal conductivity higher than both the ceramic base and the heating element, acting as a thermal mediator to redistribute heat uniformly in the circumferential direction, thereby resolving the temperature non-uniformity without significantly increasing overall structural complexity
Solution Approach 2:
The heater employs a composite structure combining the ceramic base, heating element, and high heat conductivity member. This composite material approach allows each component to contribute its specific thermal properties, creating a system that achieves uniform temperature distribution while maintaining structural integrity and avoiding excessive complexity
2Temperature
If the high heat conductivity member is positioned to contact both opposing portions of the heating element, then heat transfer to cooler regions is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the high heat conductivity member should have a width that is 0.3 mm or more. This dimensional specification acts as a tolerance buffer, ensuring that even with normal manufacturing variations, the member will maintain contact with both opposing portions of the heating element. This approach improves heat transfer efficiency while accommodating typical manufacturing precision limits without requiring ultra-precise positioning
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 solution achieves a more uniform temperature distribution across the ceramic base by enhancing heat transfer to regions that tend to be cooler, thereby improving heating uniformity.
Implementation Method 1
a high heat conductivity member having a heat conductivity higher than a heat conductivity of the ceramic base is disposed between opposing portions in the ceramic base
Data Source
AI summary
The ceramic heater comprises a heating resistor that includes opposing portions disposed side by side, a pair of lead members connected to ends of the heating resistor, and a ceramic base in which the heating resistor and the lead members are embedded, wherein a high heat conductivity member that has a heat conductivity higher than that of the ceramic base is disposed between the opposing portions in the ceramic base.