Perpendicular Wire Grid Shielding for Microwave Leakage and Eddy Current Loss
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Solution Overview
Problem
Existing microwave oven shielding systems, particularly those using non-magnetic metal meshes, suffer from substantial energy losses due to microwave absorption and electromagnetic induction, leading to heating and deformation, which are not efficiently addressed by current solutions.
Innovation Solution
A shielding system comprising two layers of perpendicular parallel metal conductors insulated from each other and grounded, with each layer comprising parallel metal wires connected at one end, reduces microwave leakage and eddy current losses while allowing airflow and supporting a transparent sheet for reduced heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-magnetic metal mesh is used as shielding system, then microwave leakage is blocked, but substantial energy losses occur due to microwave absorption and electromagnetic induction
Solution Approach 1:
The shielding system is divided into multiple discrete metal wire elements arranged in a grid pattern rather than using a continuous mesh. Each wire element acts as an independent shielding unit that blocks microwave leakage while minimizing continuous path for eddy currents, thereby reducing energy losses.
Solution Approach 2:
The metal wires are positioned at specific locations and orientations within the shielding structure. The wires are arranged to be perpendicular to the primary microwave propagation direction, creating localized shielding zones that effectively block microwaves while the spacing between wires reduces continuous eddy current paths.
2Object-affected harmful factors
If metal mesh is used for shielding, then microwave leakage is prevented, but heating and deformation occur due to absorbed energy
Solution Approach 1:
By segmenting the continuous mesh into discrete wire elements, the total energy absorption is distributed across many smaller elements rather than concentrated in a continuous structure. This reduces the temperature rise in any single location and minimizes thermal deformation of the shielding system.
Solution Approach 2:
The shielding structure采用 a porous or grid-like configuration where metal wires are spaced apart rather than forming a solid mesh. This porous structure allows microwave energy to be scattered and absorbed more evenly, reducing concentrated heating while maintaining shielding effectiveness.
3Object-affected harmful factors
If shielding system is made dense to block microwaves, then microwave leakage is reduced, but airflow is blocked
Solution Approach 1:
The shielding system uses segmented wire elements spaced apart to form an open grid structure. This segmentation allows microwave blocking through the wire elements while maintaining open spaces between them for airflow, solving the contradiction between shielding density and ventilation requirements.
Solution Approach 2:
The shielding system combines metal wire elements with insulating materials or support structures to create a composite grid structure. This composite approach maintains the microwave blocking capability of the metal wires while the insulating components and spacing allow for effective airflow through the shielding system.
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 significantly reduces microwave leakage and energy dissipation, enabling efficient microwave and induction cooking within the same cavity with minimal heating and deformation, while maintaining transparency and airflow.
Implementation Method 1
the mesh is heated both by microwave absorption and by electromagnetic induction
Implementation Method 2
the mesh is heated both by microwave absorption and by electromagnetic induction
Implementation Method 3
a shielding system comprising two layers of perpendicular parallel metal conductors insulated from each other and grounded
Data Source
AI summary
A shielding system for microwave ovens includes a first layer of parallel grounded conductors and a second layer of parallel grounded conductors substantially perpendicular to the conductors of the first layer and, for high frequency, electrically insulated therefrom, each layer presenting a plurality of parallel metal wires connected at one end and grounded.