Pull-Out Guide Electrical Contacting to Prevent Microwave Discharge
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Solution Overview
Problem
Existing pull-out guides in microwave and industrial ovens face issues with microwave radiation absorption, leading to heating, potential damage, and plasma discharges due to the lack of effective shielding without additional external guide elements, which restricts their design and complicates cleaning.
Innovation Solution
The implementation of means for electrical contacting between the running rail and the body rail, ensuring they are at the same potential as the oven walls, preventing charge buildup and discharges, and incorporating features like end plugs and contact rollers for secure electrical connections and grounding, allowing for a full-extension design without external shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closed hollow cross-sectional profile shielding rail is used to shield the pull-out guide from microwave radiation, then the pull-out guide is protected from microwave absorption and heating, but the pull-out rail cannot be directly supported in the movement area and requires additional external guide elements like guide rollers
Solution Approach 1:
The shielding rail is divided into multiple sections with open sides facing each other, creating a segmented structure that allows direct support of the pull-out rail in the movement area while still providing effective microwave shielding through the distributed shielding sections
Solution Approach 2:
The open-sided shielding rail sections serve multiple functions: they provide microwave radiation shielding while simultaneously allowing direct structural support of the pull-out rail, eliminating the need for separate external guide elements like guide rollers
2Ease of operation
If additional external guide elements like guide rollers are used to support the pull-out rail, then the pull-out guide can be supported in the movement area, but additional space is required and cleaning becomes problematic
Solution Approach 1:
The shielding rail structure is merged with the support function for the pull-out rail, integrating the guiding and support features directly into the shielding sections, thereby eliminating separate external guide elements that would create cleaning difficulties and space requirements
3Device complexity
If the pull-out guide components are electrically conductive and mounted in the cooking chamber, then they provide structural support and guiding functions, but microwave irradiation can cause charge buildup and plasma discharges between components
Solution Approach 1:
The shielding rail sections and pull-out rail are electrically connected through conductive elements, ensuring all conductive components are at the same electrical potential, which prevents charge buildup and plasma discharges while maintaining structural support and guiding functions
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 solution prevents microwave-induced discharges and heating, allows for a full-extension pull-out guide without additional space requirements, and simplifies cleaning by integrating electrical contacts into the existing design, ensuring safe and efficient operation.
Implementation Method 1
means for electrically contacting between the running rail and the body rail are provided... the body rail is electrically connected to the side walls of the cooking chamber, so that the rails as a whole and thus essentially all metal components of the pull-out guide that are accessible from the outside are at the same potential as the side walls of the cooking chamber
Implementation Method 2
The microwaves preferably form wave nodes on grounded components, which is why essentially no energy is transmitted by the microwaves to the grounded components
Data Source
AI summary
A pull-out guide for a microwave cooking appliance or an industrial oven includes a body rail and a running rail that is movable relative thereto, for depositing a carrier. The pull-out guide includes an electrical contact for electrically contacting the running rail with the body rail.