Metallic Porous Membrane Filter Frame Design
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Solution Overview
Problem
Cross-flow filtration using metallic porous membranes faces issues with membrane detachment under pressure and filtration object adhesion to steps in the flow passage, leading to reduced collection rates.
Innovation Solution
A filtration filter design featuring a metallic porous membrane with a held portion bent around edges of frames, securely held by upper and lower frames, reduces the step size between the membrane and frame, preventing detachment and adhesion, thus enhancing collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-flow filtration is performed using a metallic porous membrane, then filtration efficiency is improved, but the membrane becomes detached from the frame member under pressure
Solution Approach 1:
The held portion is bent into a zigzag configuration that extends in the thickness direction of the membrane, utilizing the third dimension to create multiple contact points with the frame members. This dimensional transformation allows the membrane to be securely held without interfering with the planar filtration surface.
Solution Approach 2:
The held portion is nested between the upper and lower frame members, with the bent configuration allowing it to be夹持 (clamped) securely within the frame structure. The zigzag bends create multiple nesting points that distribute the clamping force.
2Reliability
If a step is present between the membrane surface and the frame member, then the membrane can be held securely, but filtration objects adhere to the step reducing collection rate
Solution Approach 1:
Instead of creating a step in the planar direction (parallel to membrane surface), the held portion extends in the thickness direction (perpendicular to membrane surface) with zigzag bends. This dimensional shift removes the harmful step from the filtration surface while maintaining secure holding through out-of-plane configuration.
Solution Approach 2:
The held portion is localized to the outer peripheral region of the membrane, separating the holding function from the filtration surface. The inner membrane portion maintains a smooth, step-free surface optimized for filtration, while the held portion at the periphery provides secure attachment.
3Reliability
If the held portion is bent in a zigzag manner around frame edges, then membrane detachment is prevented, but device complexity increases
Solution Approach 1:
The membrane is segmented into functionally distinct regions: the inner membrane portion for filtration and the held portion for attachment. This segmentation allows each region to be optimized for its specific function without compromising the other.
Solution Approach 2:
The held portion employs curved zigzag bends instead of sharp angles, distributing stress more evenly and creating a more robust structure. The curved configuration also simplifies the bending process during manufacturing compared to complex angular folds.
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 design securely holds the metallic porous membrane and reduces filtration object adhesion, improving collection rates by maintaining membrane integrity and flow efficiency during cross-flow filtration.
Implementation Method 1
a metallic porous membrane having a center and including upper and lower opposed main surfaces, an inner membrane portion for filtering objects contained in a fluid
Data Source
AI summary
A filtration filter is suitable for performing cross-flow filtration by using a metallic porous membrane. A metallic porous membrane has a membrane portion for filtering filtration objects contained in a fluid and a held portion provided at its outer periphery. A first frame member and a second frame member hold the held portion of the metallic porous membrane there between. The held portion has a bent portion bent to a second principal surface side opposing a first principal surface of the membrane portion. The first frame member is in contact with the held portion at the first principal surface side of the metallic porous membrane. The second frame member is disposed at an inner side portion of the first frame member and is in contact with the held portion at the second principal surface side of the metallic porous membrane.