Dual Filter Bag Vessel for Fluid Filtration
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Solution Overview
Problem
Fluid filters in pressurized systems, especially those using filter bags for fine particle filtration, face frequent clogging and reduced service life due to rapid particle buildup, leading to costly downtime.
Innovation Solution
A filter vessel with a pressure chamber containing two filter bags in series, each housed in a rigid porous container, utilizing a pressure differential for sealing and a resilient annular seal to extend the service life and maintain high filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter bag is employed to provide a high degree of filtration of very fine particles, then filtration efficiency is improved, but service life is reduced due to rapid clogging
Solution Approach 1:
The single filter bag is segmented into two filter bags arranged in series. The first filter bag captures larger particles while the second filter bag captures finer particles. This segmentation allows each bag to handle a specific particle size range, preventing the first bag from becoming clogged with fine particles and the second bag from being overwhelmed by large particles, thereby extending the service life of both bags while maintaining high filtration efficiency.
Solution Approach 2:
The invention adds a temporal dimension to the filtration process by implementing staged filtration. Instead of a single bag handling all particle sizes simultaneously, the series arrangement creates a sequential filtration process where particles are removed in stages, effectively adding a time-based dimension to the filtration mechanism that extends operational life.
2Reliability
If filter material is frequently replaced to maintain flow, then filtration efficiency is maintained, but system downtime increases
Solution Approach 1:
By segmenting the filtration function into two bags in series, the system maintains reliable filtration performance while reducing the frequency of replacements. Each bag can be optimized for different particle sizes, allowing them to operate longer before becoming clogged, thus reducing system downtime while maintaining consistent filtration reliability.
Solution Approach 2:
The invention changes the operational parameters of the filtration system by using two bags with potentially different mesh sizes or filtration characteristics. This parameter change allows the system to maintain high filtration efficiency over extended periods, reducing the frequency of maintenance interventions and associated downtime.
3Device complexity
If a single filter bag is used, then device complexity is reduced, but clogging occurs rapidly leading to frequent replacements
Solution Approach 1:
The filter system is segmented into two bags in series, each handling different particle size ranges. This segmentation increases service life by preventing rapid clogging of a single bag, while the added complexity remains manageable through the simple series arrangement and common mounting structure.
Solution Approach 2:
The two filter bags are nested within a common cylindrical support structure and mounting assembly. This nesting approach allows the dual-bag system to be installed and maintained as a relatively compact unit, minimizing the space and complexity penalties associated with using multiple filter elements.
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 dual-filter bag configuration with differential pressure sealing significantly reduces clogging and extends the service life of the filter bags, minimizing downtime and maintaining high filtration efficiency.
Implementation Method 1
The differential pressure of the flow through the bags provides a positive sealing force of the rims of the bags and porous containers for sealing thereabout
Implementation Method 2
filtering material disposed in the chamber so as to filter all of the fluid as it passes between the inlet and the outlet
Data Source
AI summary
A fluid pressure vessel has a chamber with an inlet and outlet with a nested primary and secondary filter bag disposed such that the primary bag communicates exclusively with the inlet, and flow through the primary bag flows through the secondary bag before the outlet. The primary bag is disposed in a first rigid porous basket and the bag rim seals against a flange on the first basket. The secondary filter bag surrounds the first basket and the rim of the secondary bag is sealed around the flange of first basket. A second rigid porous basket surrounds the secondary filter bag and is sealed on the rim of the secondary filter bag and is sealed against the inner periphery of the pressure chamber by an O-ring.