Melt-Blown Depth Filter Element with Outer-Zone Reinforcement
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Solution Overview
Problem
Existing depth filter elements face challenges in maintaining structural integrity, particularly in large diameter and thick-walled configurations, leading to potential collapse of outer zones and reduced dirt holding capacity.
Innovation Solution
A depth filter element design featuring concentric zones with a traversing filament that oscillates laterally relative to the mandrel, biased towards the outer zones, combined with a compound motion nozzle assembly to enhance filament distribution, ensuring more mass is located in outer zones and improving structural stiffness and dirt holding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the filter element is made with large diameter and thick walls to increase dirt holding capacity, then the dirt holding capacity is improved, but the structural integrity deteriorates leading to zone collapse
Solution Approach 1:
The patent applies local quality by varying the filament mass distribution across different radial zones of the filter element. Specifically, the traversing filament deposits more mass in the outer zones (zones 3-5) compared to inner zones, creating non-uniform local density. This localized reinforcement in outer zones provides structural support where it is most needed to prevent collapse, while maintaining overall porosity and filtration performance.
Solution Approach 2:
The patent creates a composite structure by combining multiple filament types (radial filaments, circumferential filaments, and traversing filaments) with different orientations and mass distributions. The traversing filament acts as a reinforcing component that weaves through the concentric zones, creating a composite architecture that enhances structural integrity while preserving the porous filtration matrix. This composite approach allows the filter to withstand higher differential pressures without zone collapse.
2Ease of manufacture
If the traversing filament mass is uniformly distributed across all zones, then the manufacturing process is simpler, but the structural stiffness in outer zones is insufficient
Solution Approach 1:
The oscillating nozzle assembly creates local quality variations in filament mass distribution. By oscillating the nozzle laterally, the system deposits more traversing filament mass in outer zones (zones 3-5) where structural support is critical, while maintaining lower mass in inner zones. This non-uniform distribution is achieved through controlled oscillation motion that modulates the filament deposition rate and position, providing enhanced structural stiffness where needed without complicating the overall manufacturing process.
Solution Approach 2:
The patent introduces dynamics by using an oscillating nozzle assembly that dynamically adjusts the filament deposition pattern. The nozzle oscillates laterally during the winding process, creating time-varying mass distribution across the radial zones. This dynamic approach allows the manufacturing process to automatically achieve non-uniform mass distribution without requiring complex multi-step procedures or manual intervention, thereby maintaining ease of manufacture while improving structural performance.
3Strength
If the outer zones are reinforced with additional filament mass to prevent collapse, then the structural integrity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs dynamics by using a relatively simple oscillating nozzle assembly that creates complex non-uniform mass distribution patterns. The oscillation mechanism, driven by a cam-follower system or similar simple mechanism, automatically modulates the filament deposition to concentrate mass in outer zones. This dynamic approach achieves structural reinforcement without requiring complex multi-axis CNC control or sophisticated real-time monitoring systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent applies periodic action through the oscillating nozzle assembly that rhythmically deposits filament mass as it traverses the radial zones. The oscillation creates a periodic variation in mass deposition rate and position, with peaks in mass concentration occurring in the outer zones where structural support is most needed. This periodic deposition pattern is achieved through simple mechanical oscillation rather than complex real-time control algorithms, maintaining manufacturing simplicity while achieving the desired structural reinforcement.
Data Source
AI summary
A tubular depth filter element has one or more concentric zones. Each zone includes layers of a melt blown filament. An additional filament oscillates through the depth of the element, traversing through part of the depth of the filament with each oscillation but traversing through substantially all of the depth of the element over multiple oscillations. The traversing filament is preferably biased towards the outside of the element. The depth filter element may be made by spraying filaments onto a rotating mandrel. The filaments of the concentric zones are sprayed from fixed nozzles spaced apart along the length of the mandrel. The traversing filament is sprayed from a nozzle assembly that moves laterally or has compound motion relative to the mandrel. For example, the nozzle assembly may oscillate relative to the mandrel while an air attenuator of the nozzle assembly oscillates relative to the remainder of the nozzle assembly.