Multi-Stage Filtration Device for Fuel Vapor Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current filtration devices in fuel vapor recovery systems are inefficient due to water passing through foam filters, dust and contaminant buildup, and fluctuations in differential pressure, leading to reduced effectiveness in removing contaminants from air used to purge vapor canisters.
Innovation Solution
A filtration device with a housing featuring multiple chambers that utilize centrifugal force to separate contaminants from air streams, directing air to rotate and forcing impurities against chamber walls, which are then drained out, maintaining consistent differential pressure and ensuring efficient filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foam filter is used to filter fresh air, then filtration is provided, but water passes through the filter and contaminants build up, reducing effectiveness
Solution Approach 1:
The filter housing is divided into multiple chambers separated by partition walls, with each chamber containing a specific filter element. This segmentation allows different filtration functions (water separation, particulate filtration) to be performed in separate chambers, preventing contaminant buildup and maintaining consistent filtration effectiveness.
Solution Approach 2:
A coalescing filter element is introduced as an intermediary component between the air intake and the canister. This element specifically targets water vapor and liquid water, coalescing them into larger droplets that are then drained away, preventing water from passing through to the canister while also capturing particulates.
2Device complexity
If a single-stage filter is used, then the device is simple, but differential pressure fluctuates, reducing filtration efficiency
Solution Approach 1:
The filtration system is divided into multiple stages with separate chambers for different filtration functions. The first chamber handles water vapor condensation and coalescence, while the second chamber handles particulate filtration. This multi-stage approach maintains more consistent differential pressure across the filter assembly compared to a single-stage filter.
Solution Approach 2:
The filter elements are designed to accommodate varying flow conditions while maintaining effective filtration. The coalescing element and particulate filter are configured to work together dynamically, with the partition wall between chambers helping to stabilize pressure differentials during different operating conditions.
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 filtration device effectively removes particulate matter and moisture from air streams, maintaining consistent differential pressure and reducing maintenance needs, thereby enhancing the efficiency of air purification for vapor canisters.
Implementation Method 1
The chamber defines a passage configured to direct the air stream to rotate in the chamber. The rotating air stream utilizes centrifugal force to separate particulate matter and moisture from the air.
Implementation Method 2
The filtration device is configured to maintain a substantially constant differential pressure
Data Source
AI summary
A filtration device for filtering air for use with a fuel vapor recovery system, the filtration device including a housing having a cover and a base. The cover defines an outlet and a plurality of inlets allowing air to enter the housing. The housing includes a plurality of internal walls defining a plurality of chambers. The plurality of internal walls define a plurality of inlets configured to direct air entering the device to flow along the inner circumference of a cylinder, thereby generating an air stream having a sufficient flow velocity such that centrifugal force forces contaminants to separate from the air.