Cylindrical Filter Element Axial Backwashing Design
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Solution Overview
Problem
Conventional filtration devices face issues with uneven backwashing effectiveness, foreign substances adhering to the filter elements, and potential damage from pressure differences during backwashing, leading to reduced filtration performance and risk of filter element crushing.
Innovation Solution
A filtration device with a cylindrical filter element that allows fluid to pass from the inside to the outside, featuring a wash pipe connected to one end for axial direction flow washing, and a filter medium with elongated mesh openings parallel to the axis and larger mesh pitch in the axial direction for enhanced washing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional backwashing is performed with the other end of the filter element closed or with a partition/narrowed portion in the central part, then the structure is simple, but the axial direction flow becomes weak away from the discharge channel end, reducing backwashing effectiveness
Solution Approach 1:
The invention removes the partition or narrowed portion from the central part of the filter element, extracting the structural constraint that limited axial flow. By taking out this obstacle, the axial direction flow can traverse the entire length of the filter element during backwashing, ensuring uniform washing effectiveness from both ends without requiring complex internal partitions.
Solution Approach 2:
The invention inverts the conventional backwashing approach by keeping both ends open instead of closing one end or adding partitions. This inversion allows the axial flow to move freely through the entire filter element length, creating a backwashing pattern that is more effective than the traditional single-end discharge method.
2Ease of operation
If backwashing is performed with high flow rate to remove trapped substances, then washing effectiveness improves, but foreign substances adhere to the outside of the filter element
Solution Approach 1:
The invention converts the high flow rate that causes foreign substance adhesion into a benefit by directing it axially through the filter element. The same high velocity that could adhere substances to the outside is now used to create strong axial flow that removes trapped substances from inside the filter element, turning a harmful effect into a useful washing mechanism.
Solution Approach 2:
The invention changes the flow direction from radial (outside to inside) to axial (through the length of the element). This dimensional change allows the high flow rate to act along the axial direction, effectively removing trapped substances without causing adhesion to the outer surface, as the flow remains contained within the element structure.
3Ease of operation
If pressure difference is increased during backwashing to enhance washing, then trapped substance removal improves, but filter element crushing risk increases
Solution Approach 1:
The invention implements dynamic pressure distribution by allowing both ends to be open during backwashing. This creates a balanced pressure environment where the axial flow can move freely from one end to the other, reducing localized pressure peaks that would occur with closed-end configurations. The dynamic flow adjustment prevents excessive pressure buildup that could crush the filter element while maintaining washing efficiency.
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 axial direction flow washing ensures consistent and effective removal of trapped substances, reduces adhesion of foreign substances, and minimizes pressure differences, thereby improving filtration performance and preventing filter element damage.
Implementation Method 1
fluid is made to flow in an axial direction of the filter element from the first or second raw fluid chamber via the other end of the filter element, to wash the filter element
Implementation Method 2
the filtration device is capable of filtering fluid by letting the fluid pass through a cylindrical filter element from the inside to the outside thereof, and removing, by an axial direction flow inside the filter element, trapped substances trapped inside the filter element by filtration
Data Source
AI summary
A filtration device including: a casing; a first partition wall which partitions the inside of the casing into a first raw fluid chamber and a filtered-fluid chamber; cylindrical filter elements provided inside the filtered-fluid chamber and of which the inside communicates with the first raw fluid chamber to let fluid pass through from inside toward outside to filter the fluid; a second partition wall provided on the other end of the filter elements to form a second raw fluid chamber; a wash pipe connected to an end of the filter element to let fluid flow from the raw fluid chamber in the axial direction to wash the filter elements; and a wash fluid drain pipe which discharges trapped substances, wherein the other end of the filter element connected to the wash pipe is always open to the raw fluid chamber.