Ceramic Heating Element Geometry for Stable Ignition Zones
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Solution Overview
Problem
Existing high-voltage ceramic electric heating elements suffer from low ignition reliability and a short service life due to uncertain temperature zone displacements and structural weaknesses, resulting in poor surface quality and low strength.
Innovation Solution
A high-voltage ceramic electric heating element with a temperature control region having a smaller cross-sectional area than the body, integrated into the outer resistance layer, particularly at the head portion, and manufactured using slip casting, ensuring controlled temperature zones and improved structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large-volume resistance layer is used to achieve higher resistance for high-voltage operation, then the heating temperature increases, but the temperature zone becomes difficult to control and displaces during use
Solution Approach 1:
The resistance layer is segmented into a head portion resistance layer and a tail portion resistance layer with different cross-sectional areas. The head portion has a smaller cross-sectional area to concentrate heat in a controlled zone, while the tail portion has a larger cross-sectional area. This segmentation allows high heating temperature in the head portion while maintaining temperature zone stability.
Solution Approach 2:
Different portions of the resistance layer are given different local properties: the head portion resistance layer has a smaller cross-sectional area for concentrated heating, while the tail portion has a larger cross-sectional area. This local quality differentiation enables controlled temperature zones at the heating location while maintaining overall structural integrity.
2Reliability
If the resistance layer is made larger in volume to achieve larger resistance, then high-voltage operation is enabled, but the structure becomes loose and strength decreases
Solution Approach 1:
The resistance layer is divided into head and tail portions with different dimensions. The head portion has smaller dimensions for concentrated heating, while the tail portion extends backward with larger dimensions to provide structural support and maintain overall strength without compromising high-voltage capability.
Solution Approach 2:
The heating element uses a composite structure combining ceramic materials with different properties in the head and tail portions. The head portion uses materials optimized for high-temperature resistance, while the tail portion uses materials providing structural strength and mechanical support.
3Adaptability or versatility
If the temperature zone is allowed to displace during use, then heating coverage increases, but ignition reliability decreases and service life shortens
Solution Approach 1:
The head portion resistance layer is specifically designed with smaller cross-sectional area to concentrate heat generation in a fixed, controlled zone. This local quality ensures that the temperature zone remains stable and does not displace during use, maintaining both ignition reliability and service life.
Solution Approach 2:
The resistance layer geometry is pre-designed during manufacturing with the head portion having smaller dimensions. This preliminary structural configuration ensures that during operation, the temperature zone will naturally concentrate in the head portion without displacement, preventing damage to weak portions before they occur.
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 effectively controls temperature zones, ensuring 100% ignition reliability and extending the service life to over 240 hours in a continuous energized state and 30,000 times in a flame combustion chamber, with a smooth surface and enhanced structural strength.
Implementation Method 1
a temperature control region is provided at a position on an outer resistance layer of the body
Data Source
AI summary
A high-voltage ceramic electric heating element, comprising a body (9), the body (9) being hollow and having an open trailing portion, and a notch (7) being provided on the body (9) in the axial direction and extending through from left to right; a temperature control region (8) is provided at a position on an outer resistance layer (2) of the body (9), and the cross sectional area of the temperature control region (8) is smaller than the cross sectional area of the body (9). Using the high-voltage ceramic electric heating element can improve the ignition reliability and the service life.