Shielding Plate Slit Pattern for Microwave Induction Oven
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Solution Overview
Problem
The existing shielding plates in combined microwave and induction heating ovens suffer from eddy current issues, leading to heating inefficiencies and damage, as they can act as induction pathways and allow electromagnetic wave leakage.
Innovation Solution
A shielding plate design with a slit pattern on one surface and a perpendicular pattern on the other, separated by an insulating spacer, prevents eddy currents and ensures high heating efficiency by blocking electromagnetic waves and magnetic fields effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding plate is installed to protect the induction coil from microwaves, then microwave shielding is improved, but the shielding plate becomes an eddy current passage and is heated/damaged
Solution Approach 1:
The shielding plate is segmented into a first metal wire portion and a second metal wire portion spaced apart from each other, with an insulating material interposed between them. This segmentation breaks the continuous conductive path that would otherwise allow eddy currents to flow across the entire shielding plate, preventing eddy current heating while maintaining microwave shielding capability.
Solution Approach 2:
An insulating material is introduced as an intermediary between the first metal wire portion and the second metal wire portion. This insulating material acts as a mediator that electrically isolates the two conductive portions, blocking eddy current flow while allowing the shielding plate to maintain its microwave shielding function through the distributed metal wire structures.
2Object-affected harmful factors
If a shielding plate is installed to protect the induction coil, then microwave shielding is improved, but the heating efficiency of the induction coil is lowered
Solution Approach 1:
The shielding plate is divided into separate first and second metal wire portions with spacing between them, creating a structure that is less obstructive to magnetic field penetration. The segmented design reduces the overall conductive material in the path of the induction coil's magnetic field, thereby minimizing interference with induction heating while still providing effective microwave shielding.
Solution Approach 2:
The shielding plate employs different local structures - metal wire portions for microwave shielding and spaced regions for magnetic field transmission. The insulating material is strategically placed only where needed to block eddy currents, while leaving other regions open to allow magnetic field penetration for efficient induction heating. This localized differentiation of properties resolves the contradiction between shielding and heating efficiency.
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 prevents eddy currents and electromagnetic wave leakage, enhancing heating efficiency and protecting the shielding plate from damage, while maintaining high induction heating performance.
Implementation Method 1
a shielding plate, the shielding plate comprises a first metal wire portion in which a plurality of metal wires are arranged parallel to each other, and a second metal wire portion in which a plurality of metal wires are arranged parallel to each other so as to be spaced apart from the first metal wire portion at a predetermined interval and face each other at a predetermined angle
Implementation Method 2
a working coil generating an induced current
Implementation Method 3
capable of cooking food in a cavity by induction heating via the induction coil
Implementation Method 4
A microwave oven is a cooking device that uses microwaves to heat and cook food to be cooked using microwaves, molecules constituting food vibrate with microwaves, and as a result, the temperature of food rises due to frictional heat generated between the constituent molecules
Implementation Method 5
the shielding plate comprises an insulating material interposed between the first metal wire portion and the second metal wire portion
Data Source
AI summary
The cooking appliance has a casing having an open front, a cooking space formed therein and an opening part formed at one side thereof, a microwave generator for generating and directing a microwave toward the cooking space; an induction coil facing the opening part, the cooking part being arranged outside the space; and a shielding plate arranged between the induction coil and the opening part. The shielding plate includes an insulator; a first pattern, which is formed on one surface of the insulator and faces the opening part, and a second pattern, which is formed on the other surface of the insulator and is perpendicular to the first pattern. The first pattern has a slit formed in a region facing the opening part.