Magnet Assembly with Alternating Polarity for Fuel Contamination
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Solution Overview
Problem
Ferrous contamination in liquid fuel poses a significant problem due to interference with electrical systems in fuel delivery modules, leading to blockages and costly maintenance, as conventional magnets either interfere with electrical components or fail to effectively capture contaminants at a distance.
Innovation Solution
A magnet assembly with multiple neodymium magnets arranged in a specific configuration to enhance the magnetic field on one side while reducing it on the other, allowing for effective ferrous particle attraction without interfering with electrical systems, and featuring a ferrous mounting plate to shield electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large powerful magnet is placed close to the FDM inlet to maximize ferrous particle attraction, then the effectiveness of contaminant capture is improved, but the magnetic field interferes with electrical systems of the FDM and other components
Solution Approach 1:
The mounting plate is designed with differentiated magnetic properties: the first surface (exposed to fuel) has high magnetic permeability to concentrate and enhance the magnetic field for effective particle capture, while the second surface (facing electrical systems) has low magnetic permeability to shield and reduce magnetic field interference with electrical components
Solution Approach 2:
The mounting plate acts as an intermediary element between the magnets and electrical systems, mediating the magnetic field distribution by concentrating it on the fuel-exposed side while shielding the electrical side, thus resolving the conflict between contaminant capture effectiveness and electrical system protection
2Object-affected harmful factors
If the magnet is placed at a distance from the FDM to avoid electrical interference, then the magnetic field shielding requirements are reduced, but the distance from the fuel inlet increases and the effectiveness of ferrous contamination capture decreases
Solution Approach 1:
The mounting plate creates localized magnetic field enhancement at the fuel-exposed surface, allowing the magnet to be positioned closer to the fuel inlet without increasing interference with electrical systems, thus maintaining contaminant capture effectiveness while reducing shielding requirements
3Device complexity
If a conventional single magnet is used, then the device complexity is low, but the magnetic field is weak in the direction of the pole axis and cannot effectively attract ferrous particles at a distance
Solution Approach 1:
The magnet is divided into multiple segments (first magnet with north pole up, second magnet with south pole up) arranged in alternating polarity pattern, which creates concentrated magnetic field lines between adjacent magnets and enhances the magnetic attraction force in the vertical direction without significantly increasing device complexity
Solution Approach 2:
The alternating polarity arrangement transforms the magnetic field distribution from a simple dipole pattern to a multi-pole pattern with concentrated field lines between adjacent magnets, enhancing the magnetic force in the direction perpendicular to the mounting plate surface
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 magnet assembly provides a stronger and better-directed magnetic field for ferrous particle attraction, reducing the risk of blockages and extending the service life of fuel delivery modules by effectively capturing contaminants while minimizing interference with electrical components.
Implementation Method 1
the mounting has a magnetic permeability selected such that the magnetic field of the side of the mounting opposite the magnets is reduced
Implementation Method 2
the arrangement being such that the magnetic field on said one side is enhanced and the magnetic field on the side of the mounting opposite the magnets is reduced
Data Source
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AI summary
A magnet assembly for attracting and retaining ferrous particles in liquid fuel comprises a plurality of magnets arranged on a mounting side by side at a spacing; adjacent magnets have oppositely directed north/south axes. The arrangement provides an enhanced magnetic field on the magnet side of the mounting, and a weakened magnetic field on the opposite side. The magnets are coated to prevent corrosion thereof by fuel. The assembly may be housed in a moulded plastics case defining spaced chambers for the magnets.