Discontinuous Electrode Segmentation for Dielectric Aging in Powder Impregnation
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Solution Overview
Problem
Existing methods for impregnating porous materials with powder using alternating electric fields face issues with dielectric plate aging and breakdown, leading to reduced service life and inefficient impregnation, especially when operating with high electric field levels.
Innovation Solution
A device with discontinuous electrodes subdivided into conducting strips, each covered by a dielectric screen, which reduces thermal stress and prevents breakdown, and a method using opposite-facing electrodes with dielectric screens to generate an alternating electric field for impregnating porous materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous electrodes are used to generate alternating electric field for impregnating porous materials with powder, then impregnation efficiency is improved, but dielectric screen aging accelerates and breakdown occurs
Solution Approach 1:
The continuous electrode is divided into multiple discrete conducting strips separated by slots. This segmentation reduces the thermal mass and allows heat dissipation between pulses, preventing excessive temperature rise that causes dielectric aging. The slots act as thermal and electrical breaks while maintaining the overall electric field generation capability for powder impregnation.
2Manufacturing precision
If high electric field levels are applied to enhance powder penetration into porous material, then impregnation quality is improved, but dielectric screen breakdown risk increases
Solution Approach 1:
The alternating electric field is applied periodically through the conducting strips rather than continuously. This periodic application allows dielectric screens to recover between high-field pulses, reducing cumulative thermal stress and electrical stress that lead to breakdown. The slots between strips provide natural cooling periods and field distribution optimization.
3Reliability
If dielectric plates are used to prevent electric arcing between electrodes, then electrical insulation is improved, but thermal stress causes rapid aging and breakdown
Solution Approach 1:
The dielectric screen is segmented by the slots between conducting strips, creating multiple smaller dielectric sections rather than one large continuous plate. Each segment experiences reduced thermal stress and can be independently replaced if needed. The segmentation allows better heat management while maintaining overall insulation effectiveness.
Solution Approach 2:
The slots between conducting strips act as intermediary cooling channels and stress relief zones. These slots allow heat to dissipate from the dielectric material and reduce thermal gradients, preventing the rapid aging that occurs in continuous dielectric plates under high electric field conditions.
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 extends the service life of the impregnation device by preventing dielectric screen breakdown and achieving more efficient and homogeneous impregnation with reduced temperature rise and improved resistance to aging, while maintaining high electric field effectiveness.
Implementation Method 1
both the powder and the web of fibres or filaments are subjected to an alternating electric field which is produced between two electrodes
Implementation Method 2
The first dielectric screen electrically insulates the first and second electrodes from each other at the level of said passage
Implementation Method 3
the temperature rise of the electrode, when appropriately divided up into successive strips, was less than in the case of a continuous electrode
Data Source
AI summary
This impregnation device comprises at least a first dielectric insulating screen and first and second opposite-facing electrodes which are separated by a passage for the porous material to be impregnated provided with powder and are capable of producing an alternating electric field in this passage after having been connected to an alternating voltage generator. At least first electrode comprises at least two conducting strips, each of which has an internal face covered by the first dielectric screen and, overall, is turned towards the second electrode and also a longitudinal edge running along a separating slot, which strips are separated from each other by this separating slot and are electrically connected to one another.