Coalescer Media Gradient Profile for Compact Oil Mist Removal
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Solution Overview
Problem
Current coalescer designs for crankcase ventilation systems face challenges in achieving high removal efficiency, long service life, and small package size simultaneously, as they often compromise on either high removal efficiency or long service life due to limitations in media face area, pressure drop, and internal cavity design.
Innovation Solution
The coalescer employs fibrous depth filter media with a gradient profile of fiber diameter and porosity, closed-loop non-circular cross-sectional geometries, and optimized internal cavity dimensions to maximize contaminant removal, extend service life, and reduce package size, featuring a face area ratio greater than 1.5 and a media volume to element volume ratio of at least 50%, thereby minimizing unused space and reducing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coalescer designs are used, then removal efficiency can be achieved, but service life is limited due to media face area constraints and pressure drop
Solution Approach 1:
The patent transitions from traditional two-dimensional flat media to three-dimensional depth filter media with varying porosity and fiber diameter profiles. This dimensional change allows the media to process larger volumes of fluid while maintaining low pressure drop and extending service life through optimized flow distribution throughout the media depth.
Solution Approach 2:
The patent implements non-uniform media properties with porosity and fiber diameter varying as functions of depth. The upstream region has higher porosity and larger fiber diameter to handle initial contaminant loads, while downstream regions have progressively different properties to optimize separation and drainage, thereby extending service life without increasing overall pressure drop.
2Reliability
If media face area is increased to improve removal efficiency, then contaminant removal improves, but device size increases
Solution Approach 1:
The patent employs depth filter media where the filtering action occurs throughout the thickness of the media rather than just at the surface. This three-dimensional approach allows high removal efficiency to be achieved within a compact volume by utilizing the entire media depth for contaminant capture and coalescence.
Solution Approach 2:
The patent varies porosity and fiber diameter as functions of depth within the media. By optimizing these parameters throughout the media thickness, high removal efficiency is achieved in a compact package without requiring large face areas, as the graded structure maximizes the utilization of available media volume.
3Volume of moving object
If internal cavity space is reduced to minimize package size, then device compactness improves, but flow dynamics are adversely affected
Solution Approach 1:
The patent optimizes the relationship between internal cavity dimensions and media properties. By carefully selecting cavity size and shape in conjunction with depth-varying porosity and fiber diameter, the design maintains favorable flow dynamics including appropriate velocity profiles and pressure distribution while achieving compact overall dimensions.
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 design enhances contaminant removal efficiency, extends coalescer life, and reduces the overall package size by effectively utilizing available space, achieving greater than 90% removal efficiency for oil mist and minimizing pressure drop, while maintaining long service life.
Implementation Method 1
The coalescer element has coalescer media capturing droplets of the dispersed phase, coalescingly growing the droplets into larger drops which further coalesce and grow to form pools that drain
Implementation Method 2
droplets into larger drops which further coalesce and grow to form pools that drain
Implementation Method 3
The coalescer employs fibrous depth filter media with a gradient profile of fiber diameter and porosity
Data Source
AI summary
A coalescer is provided minimizing trade-offs among high removal efficiency, low pressure drop, long service life, and small size.