Rotating Cylindrical Filter With Oblique Flow for Clogging
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Solution Overview
Problem
Filters made of nonwoven fabric clog quickly due to surface deposition and internal obstruction, leading to reduced filtering performance.
Innovation Solution
A cylindrical filter with a woven or nonwoven fabric screen, rotated to direct water flow obliquely through a nozzle port closer to the central axis than the filter radius, enhancing surface cleaning by water pressure and removing cake layers and small recess deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nonwoven fabric filter is used, then filtering is initially effective, but the filter clogs quickly due to surface deposition and internal obstruction
Solution Approach 1:
The filter cartridge is rotated around its central axis during filtration, transforming the static filtration process into a dynamic one. This rotation enables the water flow to continuously clean the filter surface, preventing cake layer formation and internal obstruction, thereby extending operational duration while maintaining filtering performance
Solution Approach 2:
The water flow that would normally contribute to clogging by depositing particles on the filter surface is instead directed to clean the surface through oblique impact during rotation. The harmful deposition effect is converted into a beneficial cleaning effect, suppressing clogging and extending filter life
2Reliability
If water flows directly through the filter surface, then filtration occurs, but surface deposition causes rapid clogging
Solution Approach 1:
The nozzle is positioned asymmetrically relative to the filter surface, with its centerline offset from the filter's central axis by a distance less than the filter radius. This asymmetric positioning creates oblique water flow impact on the filter surface, generating shear forces that prevent particle deposition and reduce clogging
Solution Approach 2:
The filtration process transitions from a simple radial flow through the filter medium to a three-dimensional flow pattern involving oblique impact, surface sweeping, and rotational movement. This dimensional change creates hydrodynamic conditions that prevent surface deposition while maintaining effective filtration
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 filter maintains continuous operation by suppressing clogging, with improved surface cleaning and reduced pressure loss over time.
Implementation Method 1
a rotation mechanism that rotates the cylindrical filter with a central axis of the cylindrical filter being defined as a center
Implementation Method 2
enhancing surface cleaning by water pressure and removing cake layers and small recess deposits
Data Source
AI summary
A filtering apparatus includes a cylindrical filter including a cylindrical screen filter, a treated water nozzle including a nozzle port, a casing where the cylindrical filter is accommodated, the casing containing the nozzle port in the inside, a filtered water flow channel through which filtered water obtained by passage of water to be treated through the screen filter is guided to the outside of the casing, the filtered water flow channel being provided with a flow inlet provided in the inside of the casing, and a rotation mechanism that rotates the cylindrical filter with a central axis of the cylindrical filter. A distance between a centerline of the nozzle port along a direction of outflow of water to be treated and the central axis of the cylindrical filter is shorter than a radius of the cylindrical filter.