Induction-Heated Plate Base Layout for Uniform Dish Heating
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Solution Overview
Problem
Porcelain or ceramic plates with uniform electrically conductive layers experience uneven heating due to non-uniform eddy current distribution, leading to temperature differences and potential food burning, especially when heating food quickly.
Innovation Solution
The electrically conductive layer on the plate base is designed with a core surface coaxial to the induction coil and concentric zones with varying widths and thicknesses matched to the magnetic field strength, ensuring even heat distribution by adjusting the amount of conductive material according to the magnetic field strength, and incorporating a non-conductive ring to enhance eddy current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform electrically conductive layer is applied to the plate base, then the manufacturing process is simple, but the heating becomes uneven causing food burning
Solution Approach 1:
The conductive layer is designed with spatially varying properties: different thicknesses in different radial zones (thinner at center, thicker at periphery) and different material compositions (silver at center, copper alloy at periphery). This local differentiation compensates for the non-uniform magnetic field distribution, achieving uniform heating across the plate surface while maintaining manufacturing feasibility through zone-based application processes.
2Productivity
If the heating time is shortened for quick heating, then productivity increases, but temperature differences become more significant leading to burning
Solution Approach 1:
The conductive layer's spatially varying thickness and composition create zones with different heating rates that compensate for thermal diffusion limitations. The peripheral zones with thicker conductive layers and lower melting point materials heat faster to compensate for slower thermal conduction from the center, enabling quick heating without excessive temperature differences or burning.
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 achieves uniform heating, preventing food burning and reducing water evaporation, while also shortening heating time and allowing for precise temperature control across the plate surface.
Implementation Method 1
an induction coil through which a high-frequency current flows, and a plate made of porcelain or ceramic, on the bottom of which there is an electrically conductive layer in which the magnetic field eddy currents generated by the induction coil
Implementation Method 2
the magnetic field eddy currents generated by the induction coil
Implementation Method 3
in which the magnetic field eddy currents generated by the induction coil
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The arrangement has an electrically conductive layer including a core-surface (11) and concentrically arranged zones (12, 13). The core-surface is arranged coaxial to an induction coil, and width and layer thickness of the zones are aligned on a magnetic field of the induction coil, so that induced eddy currents uniformly heat a bearing surface for foods. The core surface is arranged in a plate center, and the electrically conductive layer between the core surface and the zones is interrupted, where the interruption forms a ring surface (14).