Filter Drainage Layer for Gas Liquid Separation
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Solution Overview
Problem
Existing filters for separating liquid suspended particles from gas in internal combustion engines face issues with clogging due to insufficient liquid removal during fine separation, leading to increased back pressure and filter differential pressure.
Innovation Solution
Incorporating a drainage layer within the filter section for fine separation to facilitate the transport and drainage of collected liquid, and optionally adding further drainage layers upstream or downstream, or spacing between coarse and fine separation sections, with filter media having specific fiber diameters and pore sizes, and liquid-repellent surface properties to enhance separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filter media with small fiber diameter and small pore diameter are used for fine separation, then separation efficiency is improved, but the filter medium quickly clogs and back pressure increases
Solution Approach 1:
The filter medium is segmented into multiple layers with different pore sizes and fiber diameters. The coarse separation layer has larger pores while the fine separation layer has smaller pores. This segmentation allows each layer to perform its specific function without the fine separation layer becoming quickly clogged, as the coarse layer captures larger particles first.
Solution Approach 2:
Different regions of the filter medium have different properties optimized for their specific function. The coarse separation layer has larger pores and coarser fibers suited for capturing bigger particles, while the fine separation layer has smaller pores and finer fibers for capturing smaller particles. This local optimization prevents uniform clogging across the entire filter.
2Measurement precision
If filter media with small pore diameter are used to achieve high separation degree, then particle removal is improved, but liquid drainage is insufficient and back pressure increases
Solution Approach 1:
The filter is segmented into distinct functional zones: a coarse separation layer with larger pores for initial particle capture and liquid drainage, and a fine separation layer with smaller pores for high-efficiency particle removal. The coarse layer's larger pores facilitate liquid drainage while the fine layer provides high separation degree, preventing the entire filter from becoming clogged.
Solution Approach 2:
The coarse separation layer acts as an intermediary between the incoming gas stream and the fine separation layer. It performs preliminary separation and drainage functions, reducing the liquid and particle load that reaches the fine separation layer, thereby maintaining its drainage capability while achieving high overall separation degree.
3Measurement precision
If multiple layers with different pore sizes are arranged in series, then separation performance is improved, but device complexity increases
Solution Approach 1:
The filter medium is divided into a small number of functional layers (coarse separation layer and fine separation layer) with distinct pore size characteristics. This segmentation achieves improved separation performance by capturing particles of different sizes in different layers, while keeping the overall structure relatively simple and manageable.
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 reduces flow resistance and improves separation efficiency by effectively draining separated liquid, preventing reentry into the gas flow and maintaining low back pressure.
Implementation Method 1
The gas to be cleaned flows through the filter medium and the particles are retained by mechanical effects in the 3-dimensional winding flow path of the filter medium
Implementation Method 2
The principle of the coalescing filter is to bring the fine oil droplets into contact with suitable surfaces so that they combine to form larger units and can flow away via gravity and gas flow
Implementation Method 3
The principle of the coalescing filter is to bring the fine oil droplets into contact with suitable surfaces so that they combine to form larger units and can flow away via gravity and gas flow
Implementation Method 4
the fibers of the low density layer each have a fibrous form configured to drain oil or water collected by the high-density layer
Data Source
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AI summary
Filter (1) for separating liquid suspended particles from a gas, comprising: - at least one filter section (2) for coarse separation - at least one filter section (4) for fine separation wherein at least one drainage layer (D1) is arranged within the filter section (4) for fine separation.