Shearing Blade Geometry for Filtration Concentrated Layer Control
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Solution Overview
Problem
Filtration devices often fail to obtain a filtrate with predetermined slurry density due to the formation of a concentrated layer around the filtering surface, which is exacerbated by high slurry or high viscosity fluids and fine particles, causing residues to remain near the filtering surface instead of being sedimented.
Innovation Solution
A shearing member is integrated into the filtration device, comprising a blade or linear member attached to a cleaning member that rotates perpendicular to the filtering surface, positioned between the filtering surface and a circular boundary defined by a pillar, with the downstream end closer to the surface than the upstream end, designed to prevent the formation of concentrated layers by shearing and sedimenting residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cleaning member is used to remove residues from the filtering surface, then clogging of filter pores is prevented, but concentrated layers form around the filtering surface causing filtrate with predetermined slurry density to be unobtainable
Solution Approach 1:
The invention combines the cleaning function and the shearing function into a single integrated structure. The cleaning member with attached shearing blades performs both residue removal from the filtering surface and shearing of concentrated layers in the surrounding region, thereby preventing concentrated layer formation while maintaining filter pore functionality.
Solution Approach 2:
The shearing blades act as an intermediary element between the cleaning member and the concentrated layer. By positioning the blades between the cleaning member and the concentrated layer, they directly interact with and shear the concentrated layer, preventing it from forming a barrier that would compromise filtrate quality.
2Quantity of substance
If unfiltered fluid of high slurry or high viscosity is processed, then more residues are generated requiring frequent cleaning, but concentrated layers form more readily preventing predetermined slurry density filtrate
Solution Approach 1:
The shearing blades perform preliminary action by shearing concentrated layers before they can fully form and adhere to the filtering surface. This preliminary shearing prevents the concentrated layer from becoming a stable barrier, ensuring that subsequent filtration maintains predetermined slurry density even when processing high slurry or high viscosity fluids.
3Manufacturing precision
If fine particles are present in unfiltered fluid, then filtration efficiency is reduced due to concentrated layer formation, but cleaning alone cannot prevent concentrated layer formation
Solution Approach 1:
The shearing blades serve as an intermediary that directly addresses the concentrated layer problem caused by fine particles. By positioning the blades between the cleaning member and the concentrated layer, they shear the concentrated layer of fine particles, preventing it from forming a stable barrier that would reduce filtration efficiency and compromise filtrate quality.
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 shearing member effectively reduces or prevents the concentration of unfiltered fluid around the filtering surface, ensuring a filtrate with predetermined slurry density is obtained by sedimenting residues and maintaining filter pore functionality.
Implementation Method 1
a distance between the downstream end and the filtering surface in the radial direction is shorter than a distance between the upstream end and the filtering surface in the radial direction
Implementation Method 2
designed to prevent the formation of concentrated layers by shearing and sedimenting residues
Data Source
AI summary
A shearing blade is used in a filtration device including a filtering element having a filtering surface and a plurality of filter pores provided on the filtering surface for filtering unfiltered fluid introduced into a primary side, a scraper abutting the filtering element for cleaning the filtering surface by rotating in a rotational direction, a pillar provided in the primary side to which the scraper is attached, and a tube body. The front end portion of the shearing blade is at least disposed between the filtering surface and a circle defined by the outer circumferential end of the pillar in the radial direction, and the distance between the front end portion and the filtering surface in the radial direction is shorter than the distance between the rear end portion of the shearing blade and the filtering surface in the radial direction.