Fuel Filter Coalescing Medium Transverse Fiber Orientation
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Solution Overview
Problem
Current fuel filters for internal combustion engines, particularly those for diesel fuel, face challenges in effectively filtering particles and separating water from fuel, as they often rely on radial flow orientations that can lead to inefficient water droplet collection and coalescence.
Innovation Solution
The fuel filter employs a multi-stage design with a coalescing medium having fibers oriented transversely to the main flow direction, combined with a hydrophobic separating medium, to enhance water droplet coalescence and separation, allowing for efficient collection and discharge of water based on gravity, and can be arranged vertically or upside down depending on fuel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radial flow orientation is used in the fuel filter, then the filter structure is simple and compact, but water droplet collection and coalescence efficiency deteriorates
Solution Approach 1:
The filter element is divided into multiple functional zones: an outer filter medium for particle filtration, a middle coalescing medium with radially oriented fibers for water droplet coalescence, and an inner separation medium for water-fuel separation. This segmentation allows each zone to perform its specific function optimally while maintaining overall structural compactness.
Solution Approach 2:
Different regions of the filter element have different fiber orientations tailored to local flow patterns and separation requirements. The coalescing medium has radially oriented fibers to capture water droplets from radial flow, while the separating medium has axially oriented fibers to facilitate water droplet coalescence and separation in the axial direction. This local optimization resolves the contradiction between structural simplicity and separation efficiency.
2Manufacturing precision
If conventional filter media is used, then particle filtration is achieved, but water droplet coalescence and separation efficiency deteriorates
Solution Approach 1:
The filter element uses a composite structure combining three different media types: a filter medium for particle removal, a coalescing medium with specific fiber orientation for water droplet coalescence, and a separating medium for water-fuel separation. This composite material approach enables simultaneous achievement of particle filtration and water separation functions that cannot be achieved with conventional single-media filters.
3Reliability
If multi-stage design with transverse fiber orientation is used, then water droplet coalescence efficiency is improved, but device complexity increases
Solution Approach 1:
The filter element employs a nested concentric cylinder structure where the coalescing medium is positioned between the outer filter medium and the inner separating medium. All three media are arranged coaxially around a central axis, creating a compact nested configuration that achieves multi-stage separation functionality without excessive device complexity. The nested structure allows efficient space utilization while maintaining distinct functional zones.
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 configuration increases the dwell time of water droplets on the fibers, improving coalescence efficiency and allowing for effective separation of water droplets, even the smallest ones, and minimizes stretchability issues in the non-woven layer, leading to improved filtration and water separation performance.
Implementation Method 1
a coalescing medium (58) having a fiber fleece with at least one layer of a fleece suitable for the coalescence of water, wherein a main orientation of fibers of the at least one fleece layer runs transversely to a main flow path for water to be separated downstream of the coalescing medium
Implementation Method 2
surrounding it or in the interior space delimited by it, a hydrophobic, fuel-permeable separating medium designed as a hollow body for separating water contained in the fuel
Implementation Method 3
a hydrophobic, fuel-permeable separating medium designed as a hollow body for separating water contained in the fuel
Data Source
AI summary
The invention describes a fuel filter (10) for fuel, in particular diesel fuel, of an internal combustion engine in particular of a motor vehicle, and a filter element (36). A housing (12) of the fuel filter (10) has at least one fuel inlet (26) for fuel to be cleaned, at least one fuel outlet (18) for cleaned fuel, and at least one water outlet (30) for water separated off from the fuel. In the housing (12) there is arranged the filter element (36) which sealingly separates the fuel inlet (26) from the fuel outlet (18). The filter element (36) has a filter medium (38) which is in the form of a hollow body and which, for the filtering of the fuel, can be traversed by flow from the inside to the outside or from the outside to the inside. A coalescence medium (58), in the form of a hollow body, for separating off water contained in the fuel is arranged downstream of the filter medium (38) as viewed in the flow path (78) of the fuel, is arranged surrounding said filter medium or is arranged in the interior (45) delimited by said filter medium. The coalescence medium (58) comprises at least one layer of a nonwoven suitable for the coalescence of water. The main orientation of fibres of the at least one nonwoven layer runs transversely with respect to a main flow path (84) for the separated-off water downstream of the coalescence medium (58).