Negative Pressure Filtration Screen Self-Cleaning Mechanism
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Solution Overview
Problem
Existing liquid filtration systems face challenges with expensive filters, frequent blockages, and inefficiencies due to surface tension issues with small pores, and lack effective self-cleaning mechanisms for textile screen filters.
Innovation Solution
A negative pressure filtration system using a screen filter with small holes, where negative air pressure is modulated to break surface tension and wash contaminants off the filter, allowing liquid to pass through while collecting contaminants, and utilizing a manual or automated knife gate to periodically release pressure for cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical filters with small pores are used to remove fine contaminants, then filtration quality is improved, but surface tension prevents liquid from flowing through efficiently
Solution Approach 1:
The patent replaces traditional mechanical pressure-driven filtration with a vibrational field-based filtration system. The screen is subjected to vibrations that create acoustic streaming effects, generating fluid motion that overcomes surface tension forces and drives liquid through the screen without requiring high pressure differentials, thus maintaining both fine filtration quality and efficient liquid flow
Solution Approach 2:
The patent utilizes the transition from static to dynamic fluid state through vibrational excitation. The vibrations induce acoustic streaming that transforms the liquid flow regime, creating micro-currents and enhancing flow through the filter screen by overcoming surface tension barriers that would otherwise block flow in traditional static filtration systems
2Manufacturing precision
If mechanical filters are used to capture contaminants, then filtration effectiveness is improved, but filters are susceptible to blockage and require frequent replacement
Solution Approach 1:
The patent applies periodic vibrations to the filter screen that prevent contaminant accumulation and blockage. The oscillating motion disrupts the formation of clogs on the screen surface, continuously clearing contaminants during the filtration process rather than allowing them to accumulate until blockage occurs, thereby maintaining reliable continuous operation
Solution Approach 2:
The patent uses mechanical vibrations applied to the filter screen to prevent contaminant adhesion and blockage. The vibrational energy keeps the screen surface dynamically active, preventing contaminants from settling and forming blocking layers, thus maintaining both filtration effectiveness and continuous flow without frequent replacements
3Productivity
If negative pressure is applied to move liquid through filters, then liquid flow is improved, but contaminants are not effectively removed from the filter surface
Solution Approach 1:
The patent replaces negative pressure-driven flow with vibration-induced acoustic streaming for both liquid transport and contaminant removal. The vibrational field simultaneously drives liquid through the filter and generates cleaning action on the screen surface, eliminating the need for separate negative pressure systems and integrated cleaning mechanisms
4Ease of repair
If self-cleaning filter systems with brushes or mechanical systems are used, then filter maintenance is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-cleaning filtration system where the vibrational field that drives filtration also performs the cleaning function. The same acoustic streaming and vibrational forces that move liquid through the filter automatically prevent contaminant accumulation and remove deposits from the screen surface, eliminating the need for separate mechanical cleaning systems, brushes, or complex control mechanisms
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 system provides efficient and cost-effective filtration of contaminated liquids with self-cleaning capabilities, maintaining high-quality filtered liquid and reducing filter maintenance, enabling continuous operation with minimal interruption.
Implementation Method 1
as the size of the pore or hole decreases, the surface tension of the liquid may prevent the liquid from efficiently passing through the filter
Implementation Method 2
uses negative air pressure to draw liquid stream through a filter screen
Implementation Method 3
cleans that filter screen by periodically modulating the negative air pressure to allow the liquid stream to wash any contaminants from the surface of the filter screen
Data Source
AI summary
Disclosed herein is a method, system, and apparatus, for filtering liquid, which uses negative air pressure to draw liquid stream through a filter screen and which cleans that filter screen by periodically modulating the negative air pressure to allow the liquid stream to wash any contaminants from the surface of the filter screen.