Helical Scraper Magnetic Filter for Continuous Particle Removal
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Solution Overview
Problem
Existing magnetic filter technologies face inefficiencies in removing small magnetizable particles, leading to decreased filter efficiency and potential clogging, with challenges in continuous cleaning and risk of contaminants entering the cleaned fluid, especially when dealing with large volumes and diverse particle sizes.
Innovation Solution
A device with a cylindrical chamber and annular gap, utilizing a rotatable helical scraper driven only during cleaning, which separates magnetizable particles from flowing fluids by centrifugal force, with magnets placed outside or inside to enhance magnetic forces, allowing for self-cleaning without pressure disruption and minimal operational interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic filter is used to remove magnetizable particles from fluids, then filter efficiency is improved, but magnetizable particles accumulate on the filter walls and reduce efficiency over time
Solution Approach 1:
The magnetic filter system performs self-cleaning by utilizing its own magnetic field to attract and accumulate particles on the filter surface, then automatically removing these particles through a cleaning mechanism that scrapes or flushes the accumulated material without requiring external intervention or system shutdown
Solution Approach 2:
The cleaning mechanism operates continuously or periodically while the filter remains in service, allowing the magnetic filter to maintain its particle-capturing function without interruption. The cleaning action removes accumulated particles before they can block the filter pores, ensuring continuous efficient operation
2Reliability
If the magnetic filter is cleaned regularly to maintain efficiency, then filter performance is preserved, but operational interruption occurs
Solution Approach 1:
The system cleans itself automatically during normal operation or with minimal interruption, eliminating the need for manual cleaning operations that would stop production. The self-cleaning mechanism maintains filter performance while allowing continuous fluid processing
Solution Approach 2:
The cleaning mechanism operates periodically at intervals determined by particle accumulation rates, rather than requiring continuous operation or frequent manual intervention. This periodic cleaning maintains filter efficiency while minimizing disruption to the main processing operation
3Reliability
If strong magnets are used to capture small particles, then particle removal efficiency is improved, but magnetic forces may cause blockage between the cover plate and magnet
Solution Approach 1:
A cover plate or intermediate structure is positioned between the strong magnet and the fluid flow path, serving as a protective barrier that prevents direct blockage while allowing the magnetic field to pass through and capture particles. This intermediary element distributes the magnetic force and prevents particle accumulation from blocking the magnet itself
Solution Approach 2:
The magnetic field strength is optimized locally - strong enough to capture small particles on the filter surface, but with a gradient that prevents excessive force concentration that would cause blockage. The cover plate design creates local variations in magnetic field distribution to prevent harmful accumulation patterns
4Ease of operation
If the magnetic column is centrally located to facilitate rotation, then cleaning operation is simplified, but the effective area for capturing particles is reduced
Solution Approach 1:
The magnetic filtering system is divided into multiple independent magnetic elements or segments arranged around the fluid path, rather than a single central magnetic column. This segmentation increases the total surface area available for particle capture while allowing each segment to be independently cleaned or maintained
Solution Approach 2:
The magnetic capture surface is extended from a central cylindrical configuration to a distributed arrangement that utilizes the radial and axial dimensions more effectively. This dimensional optimization increases the total capture area while maintaining rotational accessibility for cleaning operations
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 solution enables efficient separation of magnetizable particles of various sizes, including those smaller than 10 μm, with reduced risk of contamination in the clean fluid and minimal operational disruption, as the device can be cleaned continuously or with minimal interruption, maintaining high filter efficiency.
Implementation Method 1
At least one magnet is arranged outside the annular gap, in the flow direction, between the fluid inlet and the clean fluid outlet
Implementation Method 2
A rotatable, helical scraper is located in the annular gap, transporting magnetizable particles deposited on the wall of the chamber and/or the inner tube to the particle outlet
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a device for separating out magnetizable impurities from flowing fluids (liquids or gases), comprising a cylindrical chamber (2) with an inlet (18) (fluid inlet) for the fluid carrying the magnetizable particles, an outlet (22) for the cleaned fluid (clean fluid outlet) and an outlet (28, 38) for the magnetizable particles (particle outlet). An internal pipe (4) that forms, together with the chamber wall, an annular gap (12) through which the fluid flows is arranged in the chamber (2). A supply valve (20) is located upstream of, or at, the fluid inlet, and an outlet valve (30, 40) is provided at the particle outlet. At least one magnet (14, 36) is arranged outside said annular gap, between the fluid inlet and the cleaned fluid outlet in the direction of flow. A rotatable, helical scraper (10) is located in the annular gap (12), which scraper transports magnetizable particles which have deposited on the chamber wall and/or the internal pipe to the particle outlet (28, 38). A drive (8) is provided for the helical scraper (10) during the period of filter cleaning.