Dielectric Bearing Shielding for Microwave Feedthroughs
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Solution Overview
Problem
High-power microwave devices used in industrial settings face challenges in achieving effective shielding against microwave radiation, leading to inhomogeneous heating due to reflections, and existing rotary feedthroughs suffer from high friction and wear due to tight dimensional tolerances and electrical conductivity requirements.
Innovation Solution
A shielding device with a dielectric gap forming a bandstop filter and reflection traps, where the gap is designed to prevent microwave penetration and features a dielectric element that acts as a bearing for the moving element, eliminating mechanical friction and wear, and allowing for maintenance-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bearing with electrically conductive components is used in the rotary feedthrough to ensure shielding, then microwave radiation shielding is achieved, but friction losses and wear increase due to tight dimensional tolerances
Solution Approach 1:
The patent replaces the traditional mechanical bearing with electrically conductive components with a dielectric bearing structure. The bearing is made of a dielectric material that is non-conductive, eliminating the need for electrically conductive components while maintaining the shielding function through the geometric design of the gap between the shaft and the bearing inner surface.
Solution Approach 2:
The patent changes the material parameter of the bearing from electrically conductive to dielectric (non-conductive). This parameter change allows the bearing to be made of a self-lubricating dielectric material, which reduces friction and wear while maintaining the shielding function through the geometric design of the gap.
2Object-affected harmful factors
If a bearing with electrically conductive components is used in the rotary feedthrough to ensure shielding, then microwave radiation shielding is achieved, but wear and lubricant loss increase over time
Solution Approach 1:
The patent replaces the traditional mechanical bearing with electrically conductive components with a dielectric bearing structure. The bearing is made of a dielectric material that is non-conductive, eliminating the need for electrically conductive components while maintaining the shielding function through the geometric design of the gap between the shaft and the bearing inner surface.
Solution Approach 2:
The dielectric bearing material is selected to be self-lubricating, which means it does not require external lubrication. This self-service property eliminates the problem of lubricant loss and wear over time, ensuring long-term reliability of the shielding function without maintenance.
3Reliability
If contact springs are used to produce electrical contact between the shaft and feed-through opening, then electrical contact is achieved, but the spring effect decreases with prolonged use
Solution Approach 1:
The patent replaces the mechanical contact spring system with a dielectric bearing structure. The bearing is made of a dielectric material that is non-conductive, eliminating the need for electrical contact through springs while maintaining the shielding function through the geometric design of the gap.
4Object-affected harmful factors
If the gap between the through-opening and moving element is reduced to improve shielding, then microwave radiation shielding is improved, but mechanical friction and wear increase
Solution Approach 1:
The patent replaces the traditional mechanical bearing with electrically conductive components with a dielectric bearing structure. The bearing is made of a dielectric material that is non-conductive, eliminating the need for electrically conductive components while maintaining the shielding function through the geometric design of the gap between the shaft and the bearing inner surface.
Solution Approach 2:
The patent changes the material parameter of the bearing from electrically conductive to dielectric (non-conductive). This parameter change allows the bearing to be made of a self-lubricating dielectric material, which reduces friction and wear while maintaining the shielding function through the geometric design of the gap.
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 effective and low-wear shielding, ensuring homogeneous heating and reducing maintenance needs by preventing microwave radiation leakage and minimizing mechanical wear, while allowing for the rotation of reflective mirrors within the microwave device.
Implementation Method 1
a geometric shape of the gap is so formed that the gap forms a bandstop filter for microwaves
Implementation Method 2
at least one mode formed by the microwave device can be reflected by means of the reflection trap
Implementation Method 3
a dielectric element which fills the gap in a region of the gap shoulder, the dielectric element forming a bearing for the moving element
Data Source
Figure 1~2
AI summary
The invention relates to a shielding device (10) for a microwave device for the thermal treatment of products and to a microwave device, wherein the shielding device can be arranged in a microwave-shielding wall (11) of the microwave device, wherein the shielding device serves for the microwave-shielding passage of a moving element through the wall, wherein the shielding device comprises the moving element and forms a passage opening (16) for the moving element, wherein the moving element serves for the transmission of a movement and is movably guided through the passage opening, wherein a dielectric gap (18) is formed between the passage opening and the moving element, wherein a geometric shape of the gap is designed such that the gap forms a bandstop for microwaves.