Choke Seal Structure for Cooking Appliance Door Electromagnetic Shielding
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Solution Overview
Problem
Existing cooking appliance door designs face challenges in maintaining effective electromagnetic wave shielding performance due to the presence of a mounting hole for the latch, which disrupts the periodic structure of the choke, leading to increased electromagnetic wave leakage.
Innovation Solution
A choke seal structure with a design that includes a bottom face, an inner side face, and a top face extending along the periphery of the door, featuring slots that partition the structure into chokes with varying lengths and latch holes, where the top faces of chokes with latch holes are connected to increase capacitance and decrease inductance, maintaining resonance frequency and allowing for larger latch holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mounting hole is formed in the choke structure for latch installation, then the latch can be installed in the door, but the periodic structure of the choke is broken and electromagnetic wave shielding performance deteriorates
Solution Approach 1:
The patent applies local quality by creating different choke structures in different regions. The first choke portion (with mounting hole) has different geometric characteristics than the second choke portion (without mounting hole), allowing each region to be optimized for its specific function while maintaining overall shielding effectiveness through complementary design parameters.
2Loss of time
If the size of the mounting hole is increased to simplify latch installation, then installation time is reduced, but electromagnetic wave leakage through the mounting hole increases
Solution Approach 1:
The patent changes geometric parameters of the choke structure to compensate for the mounting hole's detrimental effect. By adjusting the lengths, widths, and positions of the first and second choke portions, the overall inductance and capacitance values are optimized to maintain resonance frequency and shielding performance despite the presence of a larger mounting hole.
3Reliability
If the mounting hole size is reduced to maintain shielding performance, then electromagnetic wave leakage is minimized, but installation difficulty and time increase
Solution Approach 1:
The patent segments the choke structure into distinct first and second choke portions with different functions. The first choke portion accommodates the mounting hole while the second choke portion maintains the periodic structure, allowing the system to achieve both shielding performance and installation efficiency through divided functional zones.
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 design enhances electromagnetic wave shielding performance by maintaining resonance frequency and reducing electromagnetic wave leakage, even with larger latch holes, thus simplifying latch installation and reducing installation time.
Implementation Method 1
The choke thus formed forms a circuit for shielding electromagnetic waves LC together with the front face of the main body facing the door
Implementation Method 2
a circuit for shielding electromagnetic waves LC
Data Source
AI summary
Disclosed herein are a structure for shielding electromagnetic waves, a door and a cooking appliance having the same. The structure for shielding electromagnetic waves includes a choke seal structure having a bottom face extended from a side wall portion formed at a periphery of a door in a plane direction defined by the door, an inner side face extended from the bottom face in a thickness direction of the door, and a top face extended from the inner side face toward side wall portion, the choke seal structure having a length extending along the periphery of the door, a plurality of slots arranged in a longitudinal direction of the choke seal structure at a predetermined spacing and partitioning the choke seal structure into a plurality of chokes, and a connecting face connecting between the top faces of some of the plurality of chokes, each of which has a latch hole formed in its inner side face.