Dual Stage Fuel Filter Barrier Flow Path
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Solution Overview
Problem
Existing dual stage filtration systems, particularly in fuel water separation, face inefficiencies in separating desired working fluids from undesired contaminants due to limitations in fluid flow direction and media configurations.
Innovation Solution
A dual stage filter design featuring a barrier structure between the outer and inner filtration media, which directs fluid flow to separate water from fuel by changing the flow path, utilizing downward flow and additional media in gaps to enhance separation, and incorporating textured or spiraling flanges for improved separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier is added between the outer and inner filters to direct fluid flow, then fuel water separation efficiency is improved, but device complexity increases
Solution Approach 1:
The filter is divided into two distinct stages: an outer filter for initial filtration and an inner filter for secondary filtration. The barrier physically segments the flow path between these stages, forcing fluid to change direction and contact the barrier surface, which enhances water separation while maintaining a relatively simple overall structure.
Solution Approach 2:
The barrier acts as an intermediary element between the outer and inner filters. It mediates the fluid flow by directing it in a specific pattern, allowing the fluid to interact with the barrier surface for water separation before entering the inner filter, thus improving separation efficiency without requiring a completely complex redesign.
2Reliability
If additional media is added in the gaps between filters and barrier, then separation efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Additional filtration media are strategically placed only in specific gap regions where they are most needed for enhancing separation efficiency, rather than uniformly throughout the entire filter. This localized approach improves performance while minimizing manufacturing complexity and assembly difficulty.
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 improved dual stage filter achieves high fuel water separation efficiency, with test results showing separation efficiencies ranging from 78% to 97% and low differential pressures, effectively removing water droplets and particulates from fuel, suitable for engine fuel filtration systems.
Implementation Method 1
The barrier creates a flow path between the first and second media, such that a working fluid, which is desired to pass through the first and second media, is directed by the barrier and flows through the second media, and such that another fluid, which is not desired to pass through the second media, is directed by the barrier and separates from the working fluid. Using the barrier, the dual stage filter cartridge employs a downward flow to achieve efficient fluid separation
Implementation Method 2
In some embodiments, the barrier includes a wall with a textured surface.
Implementation Method 3
In some embodiments, the barrier includes a spiraling flange on a surface of the barrier that faces that outer filter. In some embodiments, the inner filter includes an additional barrier portion above the second media. In some embodiments, the additional barrier portion includes a spiraling flange facing the barrier, which provides another flow assist with centrifugal force for added separation.
Data Source
Figure 1~2B
Figure 3
Figure 4
AI summary
A dual stage filter includes an outer filter with a first media and an inner filter with a second media. A barrier is between the first media and the second media. The barrier directs fluid flow between the first and second media. The barrier creates a flow path between the first and second media, such that a working fluid, which is desired to pass through the first and second media, is directed by the barrier and flows through the second media, and such that another fluid, which is not desired to pass through the second media, is directed by the barrier and separates from the working fluid. Using die barrier, the dual stage filter can employ either or both upward flow and downward flow to achieve efficient fluid separation, for example fuel water separation in an engine fuel filter.