Microwave Window Prestressing Ring Cooling
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Solution Overview
Problem
Existing microwave windows face challenges in achieving high output powers and resistance to thermal stresses while maintaining vacuum integrity and minimizing energy losses due to heating from high power microwave transmission.
Innovation Solution
A microwave window design featuring a dielectric disk with a main metal skirt and a prestressing ring that applies radial compressive stress and includes cooling channels to manage thermal stress and heat dissipation, using materials like stainless steel and graphite to enhance mechanical strength and prevent sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power microwave transmission is used, then output power increases, but thermal stress and heating losses increase
Solution Approach 1:
The patent changes the physical state of the dielectric material by introducing controlled micro-cracks or voids that alter thermal conductivity and stress distribution, allowing higher power transmission without excessive thermal stress accumulation
Solution Approach 2:
The patent uses composite structures combining dielectric materials with metallic reinforcement elements or layered compositions that provide both electrical insulation and thermal stress management capabilities
2Loss of energy
If dielectric losses are reduced, then energy efficiency improves, but mechanical strength may be compromised
Solution Approach 1:
The patent applies different material properties to different regions of the window - low-loss dielectric material in the central transmission area and reinforced or dissipated-loss material at the periphery and bonding zones where mechanical strength is critical
3Strength
If brazing temperature is increased, then bonding strength improves, but thermal shock risk increases
Solution Approach 1:
The patent performs preliminary stress relief heat treatment on the dielectric component before final brazing, and uses controlled heating rates during brazing to prevent thermal shock while achieving adequate bonding strength
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 mechanical strength, maintains vacuum integrity, and prevents thermal shock by effectively managing thermal stresses and heat dissipation, allowing for higher output powers and reduced manufacturing costs.
Implementation Method 1
a prestressing ring surrounding in contact the main metal skirt around the periphery of the dielectric disc and exerting at rest, over the entire periphery of the dielectric disc, a radial compressive stress directed towards the center of the dielectric disc, said prestressing ring comprising a set of at least one cooling channel drilled in the longitudinal direction of the preload ring
Implementation Method 2
by evacuating the calories due to the microwave losses in the dielectric material, the stresses are thereby minimized
Implementation Method 3
exerting at rest, over the entire periphery of the dielectric disc, a radial compressive stress directed towards the center of the dielectric disc
Implementation Method 4
the dielectric disc is brazed over its entire periphery against the inner surface of a metallic cylindrical skirt
Data Source
Figure 1~2
Figure 3~4
AI summary
microwave window (1) comprising a dielectric disk (2), a main metal skirt (3) brazed all around the periphery of the dielectric disk (2) and a prestressing ring (6) surrounding in contact the main metal skirt (3) around the periphery of the dielectric disk (2) and exerting at rest, on the entire periphery of the dielectric disk (2), a radial compressive stress directed towards the center of the dielectric disk (2), said prestressing ring (6) comprising an assembly of at least one cooling channel (7) in the longitudinal direction of the prestressing ring (6).