Annular Filter Assembly With Offset Passages for Efficient Backwashing
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Solution Overview
Problem
Existing filtering units, particularly those used in water-based applications, face inefficiencies in backwashing due to insufficient pressure gradients, leading to incomplete mesh cleaning without the need for increasing overall flow rates, which would require oversized upstream equipment.
Innovation Solution
The design incorporates annular filtering components with circumferentially distributed ribs forming sectors, offset passages, and a keying mechanism to ensure proper assembly and sequential backwashing, enhancing backflush flow efficiency without increasing overall flow or sector count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure gradient is increased to ensure complete backwashing of the filtering mesh, then backwashing efficiency is improved, but the overall flow rate increases causing loss of cleaned flow and requiring oversized upstream equipment
Solution Approach 1:
The filter is divided into multiple independent sectors separated by radial ribs, allowing selective backwashing of individual sectors. This segmentation enables the backwashing flow to be concentrated on specific sectors rather than distributed across the entire filter surface, achieving effective mesh cleaning without increasing the overall flow rate through the filter.
Solution Approach 2:
The invention applies local quality by creating sectors with different functional characteristics. Each sector can be independently backwashed when needed, while other sectors continue normal filtration. The radial ribs create localized compartments that allow targeted application of backwashing flow to specific areas with filtering mesh, improving backwashing efficiency without affecting the entire filter system.
2Reliability
If the number of sectors is increased to improve fluid distribution homogeneity, then backwashing efficiency is improved, but the device complexity and pressure losses increase
Solution Approach 1:
The filter is divided into multiple independent sectors separated by radial ribs, allowing selective backwashing of individual sectors. This segmentation enables the backwashing flow to be concentrated on specific sectors rather than distributed across the entire filter surface, achieving effective mesh cleaning without increasing the overall flow rate through the filter.
Solution Approach 2:
The invention introduces a radial dimension to the filter structure with ribs extending from the center to the periphery, creating sectors in the radial-circumferential plane. This dimensional approach allows fluid distribution to be controlled radially through distribution columns, achieving homogeneous distribution without requiring an excessive number of sectors that would increase complexity.
3Reliability
If the number of sectors is increased to improve backwashing coverage, then backwashing efficiency is improved, but pressure losses and device complexity increase
Solution Approach 1:
The filter is divided into multiple independent sectors separated by radial ribs, allowing selective backwashing of individual sectors. This segmentation enables the backwashing flow to be concentrated on specific sectors rather than distributed across the entire filter surface, achieving effective mesh cleaning without increasing the overall flow rate through the filter.
Solution Approach 2:
The invention applies partial action by backwashing only the specific sectors that require cleaning, rather than backwashing the entire filter simultaneously. The rotary distributor can selectively direct backwashing flow to individual sectors as needed, achieving adequate backwashing coverage for soiled areas without the pressure losses associated with system-wide backwashing.
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
This configuration improves backwashing efficiency by ensuring homogeneous fluid distribution and reducing pressure losses, maintaining effective filtering performance while avoiding the need for oversized equipment.
Implementation Method 1
a filtering component for a filtering unit with backwashing, the filtering component being annular and comprising an inner edge, an outer edge and a filtering medium extending between the inner edge and the outer edge
Implementation Method 2
the pressure gradient across the filtering mesh, i.e. the pressure gradient between the external face side and the internal face side
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A filtering component (10) for a filtering unit (90) with backwashing, the filtering component (10) being annular and comprising a filtering medium (22) between an inner edge (24) and an outer edge (26), and an internal face (20) and an external face (21) on either side of the filtering medium (22). The filtering component (10) is adapted to be assembled against a first identical filtering component (10') so that their facing respective internal faces (20, 20') define a space that is circumferentially compartmented by contacting respective ribs (28, 28'). One of the inner edge (24) and the outer edge (26) has passages (30) communicating with each of the sectors on the internal face (20). The external face (21) has a key (36) for pairing the filtering component (10) in a given position with respect to a second identical filtering component (10"), such that the passages (30") of the second identical filtering component (10") are offset with respect to the passages (30) of the filtering component (10).