Ceramic Heater Wiring Circuit Arc Suppression
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Solution Overview
Problem
Conventional ceramic heaters face issues with arc generation due to increased wiring density and reduced gap between terminals, leading to potential breakage when energized in a dry state.
Innovation Solution
Incorporating a material with a temperature coefficient of 3500 ppm/°C or more in the heater wiring circuits, which reduces the number of turns and increases the distance between connection terminals, thereby restraining arc generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of turns of the heater wiring circuit is increased to maintain predetermined resistance in a smaller area, then the heating function is maintained, but the gap between end wiring lines is narrowed, leading to arc generation and potential breakage
Solution Approach 1:
The patent changes the temperature coefficient parameter of the heater wiring circuit material to 3500 ppm/°C or more. This parameter change allows the wiring to achieve the same resistance with fewer turns, thereby increasing the gap between end wiring lines and preventing arc generation while maintaining the heating function.
2Device complexity
If the wiring line spacing is narrowed to reduce the number of turns, then the circuit length is reduced, but the wiring line spacing cannot be narrowed below a certain limit due to ink paste blurring in screen-printing
Solution Approach 1:
The patent changes the temperature coefficient parameter of the heater wiring circuit material to 3500 ppm/°C or more. This allows the wiring to achieve the required resistance with fewer turns and wider spacing, eliminating the manufacturing precision constraint related to ink paste blurring while reducing overall circuit complexity.
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 reduces the number of turns and increases the distance between connection terminals, preventing arc generation and enhancing the reliability of the ceramic heater.
Implementation Method 1
a heat-generating resistor (40) embedded in the ceramic substrate (13)... The ceramic heater heats water flowing through a gap between the inner wall of the heat exchanger and the outer circumference of the ceramic heater
Data Source
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AI summary
[Objective] To provide a ceramic heater having a plurality of heater wiring circuits and restraining generation of arc. [Means for Solution] In a ceramic heater 11 having a heat-generating resistor 40, a plurality of heater wiring circuits 40a, 40b having connection terminals 41, 42a, 42b to be connected to an external power supply are disposed on the same plane of the heat-generating resistor in such a manner as to overlap one another in a direction in which the connection terminals are juxtaposed, and the heater wiring circuits contain a material having a temperature coefficient of 3,500 ppm/°C or more.