Planar heating apparatus and heating device including the same
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Solution Overview
Problem
Conventional planar heating apparatuses face challenges in integrating multiple units within a high-temperature cavity of an electric oven without damaging the connectors due to the high heat generated, which affects the uniformity and efficiency of heating.
Innovation Solution
The planar heating apparatus includes a substrate with alternating first and second electrodes and heating layers, connected by power connectors that extend outside the substrate, with support brackets and connectors designed to reduce heat exposure and prevent damage, using materials like carbon nano tubes and conductive oxide layers to achieve high-temperature heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If connectors are integrated within the high-temperature cavity for compact heating apparatus, then device complexity is reduced, but the connectors are damaged due to high heat exposure
Solution Approach 1:
The heating apparatus is segmented into distinct functional zones: heating elements remain within the cavity while connectors are separated and positioned outside the high-temperature zone. This spatial segmentation allows the heating function to operate at high temperatures while protecting the connector components from thermal damage.
Solution Approach 2:
The connector arrangement transitions from a two-dimensional planar integration within the cavity to a three-dimensional configuration extending outside the cavity. This dimensional change enables connectors to be positioned in a location that is spatially separated from the heat source while maintaining electrical connectivity.
2Reliability
If connectors extend outside the substrate for heat protection, then connector reliability is improved, but device complexity and structural integration increase
Solution Approach 1:
A support structure acts as an intermediary element that bridges the substrate and the external connector components. This intermediary structure provides mechanical support and electrical connectivity while maintaining the spatial separation necessary for heat protection, thus managing the complexity through a dedicated intermediate component.
3Manufacturing precision
If multiple heating units are integrated within the cavity for uniform heating, then heating uniformity is improved, but heat exposure to connectors increases causing damage
Solution Approach 1:
The heating system is segmented into multiple independent heating units distributed within the cavity, each capable of contributing to uniform heating. The connectors for these units are collectively positioned outside the cavity, allowing the heating function to be distributed for uniformity while the connector function is centralized in a protected location.
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 allows for uniform and efficient heating of the electric oven cavity to about 600°C, while minimizing damage to the connectors and enabling flexible placement of the heating apparatus within the oven structure.
Implementation Method 1
The power from the first and second power connectors generates heat in the plurality of heating layers to heat the planar heating apparatus at a high temperature of about 600° C.
Implementation Method 2
a planar heating apparatus which generates heat, such planar heating apparatus disposed on the plate surface to radiantly apply the generated heat to the cavity
Data Source
AI summary
A planar heating apparatus includes a substrate, first electrodes on the substrate, second electrodes alternately arranged with the first electrodes, an electrode connector connecting end portions of the first or second electrodes to each other and a power connector connected to the electrode connector and to which a power supply is connected. The power connector extends outside of the substrate.