Microwave Oven Shielding Device with Bent Choke Unit
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Solution Overview
Problem
Conventional microwave ovens face challenges in effectively reducing the size of the choke unit while maintaining electromagnetic wave shielding, leading to leakage issues and increased size and logistics costs.
Innovation Solution
A shielding device with a choke unit extending from the door frame, featuring multiple bent portions and a choke cover constructed from heterogeneous materials, including an electromagnetic shielding layer, to enhance resonance and reduce wave leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the choke unit size is reduced, then the front panel size and logistics costs are reduced, but electromagnetic wave shielding performance deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple materials with different electromagnetic properties in the shielding device. Specifically, it uses a first material with high electromagnetic wave reflection capability and a second material with high electromagnetic wave absorption capability, creating a composite structure that achieves effective shielding in a compact form factor, thus resolving the contradiction between reduced size and maintained shielding performance.
2Length of moving object
If the choke unit length is reduced, then the device size is reduced, but electromagnetic wave resonance shielding becomes ineffective
Solution Approach 1:
The patent changes the electromagnetic parameters of the shielding device by incorporating materials with specific electromagnetic characteristics (high reflection capability and high absorption capability). This parameter change allows the device to achieve effective electromagnetic wave resonance shielding without requiring a long choke unit length, thus resolving the contradiction between compact size and effective resonance shielding.
3Device complexity
If a single-material choke cover is used, then the structure is simple, but electromagnetic wave shielding effectiveness is insufficient
Solution Approach 1:
The patent employs composite materials in the choke cover by integrating a first material with high reflection capability and a second material with high absorption capability. This composite structure enhances electromagnetic wave shielding effectiveness by utilizing both reflection and absorption mechanisms, while maintaining relatively simple manufacturing processes through integrated formation of the multi-material structure.
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 reduces the size of the front panel, increases the cooking chamber volume, and minimizes logistics costs by maintaining electromagnetic wave shielding without deviating from standards, even when the front panel width is reduced.
Implementation Method 1
The electromagnetic waves may be shielded through resonance of an LC circuit of the choke unit 240 of the door 12
Implementation Method 2
a cooking device using microwaves, e.g., a microwave oven, uses high-frequency waves (approximately 2.45 GHz) generated through magnetrons as a heating source
Implementation Method 3
A shielding device with a choke unit extending from the door frame, featuring multiple bent portions and a choke cover constructed from heterogeneous materials, including an electromagnetic shielding layer, to enhance resonance and reduce wave leakage
Data Source
AI summary
According to various embodiments of the disclosure, a microwave oven may include: a main body including a cooking chamber and a front panel; a door to the main body including a door frame corresponding to the front panel; and a shielding device connected to the door to shield electromagnetic waves leaking from the cooking chamber. The shielding device may include: a choke unit extending from the door frame and including a plurality of portions constructed by being bent at least once; and a choke covering the choke unit. The choke cover may include a first portion constructed of a first material coupled to a portion of the choke unit; and a second portion connected integrally with the first portion and constructed of a second material different from the first material.