Microwave Oven Side-Rack Fastening System to Prevent Radiation Leakage
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Solution Overview
Problem
Existing cooking appliances with microwave sources face challenges in preventing microwave radiation leakage when using side racks, which require complex and costly fastening systems to ensure safety during operation.
Innovation Solution
A cooking appliance design featuring a lead-through device with a tubular guide portion that includes a safety portion to shield against microwave radiation, preventing the fastening element from entering the safety zone and thus preventing microwave leakage, along with an isolation device to prevent voltage flash-overs and steam leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side racks are installed by connection to the cooking chamber wall, then support devices can be securely mounted, but the manufacturing and installation complexity increases significantly due to precautions needed to prevent microwave radiation leakage
Solution Approach 1:
The lead-through device is divided into distinct functional segments: a first portion that receives the fastening element and a second portion that extends into the cooking chamber to provide microwave shielding. This segmentation allows each part to perform its specific function independently, simplifying the overall fastening system while maintaining reliability.
Solution Approach 2:
The lead-through device acts as an intermediary component between the fastening element and the cooking chamber wall. It provides a pre-configured shielding structure that mediates the connection, eliminating the need for complex additional shielding measures and reducing installation complexity.
2Object-affected harmful factors
If complex fastening devices are used to prevent microwave radiation leakage, then radiation safety is improved, but manufacturing and installation costs increase
Solution Approach 1:
The lead-through device combines multiple functions into a single component: mechanical fastening support and microwave radiation shielding. By merging these functions, the patent eliminates the need for separate complex shielding structures, reducing manufacturing steps and costs while maintaining radiation safety.
Solution Approach 2:
The lead-through device serves multiple purposes simultaneously: it provides structural support for the fastening element, extends into the cooking chamber to provide microwave shielding, and creates a sealed connection. This multi-functionality reduces the number of components needed and simplifies manufacturing.
3Stability of the object's composition
If fastening elements extend into the cooking chamber for secure mounting, then support stability is improved, but microwave radiation leakage risk increases
Solution Approach 1:
The second portion of the lead-through device is nested within the cooking chamber space, extending from the wall opening inward. This nested configuration allows the shielding structure to be positioned exactly where needed to prevent radiation leakage from the fastening element, while maintaining support stability.
Solution Approach 2:
The lead-through device provides localized microwave shielding precisely at the fastening element location where radiation leakage would occur. The second portion extends only as far as necessary into the cooking chamber to provide adequate shielding, applying the shielding quality exactly where it is needed without unnecessary complexity elsewhere.
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 provides a reliable, inexpensive, and visually appealing method to install support devices for food-supporting members while preventing microwave radiation leakage and voltage flash-overs, allowing for safe and efficient microwave operation.
Implementation Method 1
a tubular guide portion (64) formed at the through-hole (14) of the lead-through device (4), wherein the tubular guide portion (64) includes a safety portion (24) for shielding against microwave radiation
Data Source
AI summary
A cooking appliance includes a cooking chamber with cooking chamber wall, a microwave heat source configured to heat food, and a support device configured to hold a food-supporting member. The cooking chamber wall includes an opening and a lead-through device, and the lead-through device includes a through-hole configured to receive a fastening element of the support device. A tubular guide portion is formed at the through-hole of the lead-through device, and the tubular guide portion includes a safety portion configured to shield against microwave radiation and such that no part of the fastening element is located within the safety portion when the fastening element is in an installed condition in the lead-through device.