V-Type Filter Backing Net with Varying Height Beams
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Solution Overview
Problem
Pleated filter media in V-type arrangements face deflection issues due to lack of adequate support, leading to increased pressure drop and potential breakage, as existing support elements like flexible scrims can transfer forces to pleats, causing deformation or rupture.
Innovation Solution
A backing net with longitudinally varying height beams provides high rigidity while minimizing thickness, combined with outward ribs and dovetail slots for secure attachment, reducing dead areas and preventing deflection, and featuring tabs for secure mounting and stackability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a flexible scrim is attached to the downstream surface of filter media to provide support, then deflection of filter media is reduced, but the scrim transfers forces to the pleats which may cause burst or deformation
Solution Approach 1:
A separate backing net structure is introduced as an intermediary element between the filter media and the support function. The backing net has longitudinal beams with varying heights that provide mechanical support without directly attaching to the pleats, thus mediating the support function while isolating the filter media from harmful force transfers.
Solution Approach 2:
The backing net is segmented into multiple longitudinal beams with different height profiles along their lengths. This segmentation allows different portions of the backing net to provide different levels of support - higher sections provide rigidity where needed, while lower sections reduce thickness and dead area, preventing uniform force distribution that could harm the filter media.
2Strength
If beams of uniform height are used to provide sufficient rigidity against deflection, then filter media support is improved, but the combined thickness of filter media and backing net is increased
Solution Approach 1:
The backing net employs longitudinal beams with non-uniform height distribution - the height varies along the length of each beam. This local quality variation ensures that rigidity is provided only where structurally necessary, while minimizing thickness in other areas, thus achieving the required strength without excessive overall thickness.
Solution Approach 2:
Instead of using uniform height across the entire backing net, the invention introduces variation in the height dimension along the length of longitudinal beams. This dimensional change allows the backing net to achieve sufficient rigidity through strategic height variation rather than uniform thickness, reducing the overall thickness contribution to dead area.
3Object-generated harmful factors
If the height of longitudinal beams is reduced towards the ends, then the thickness contribution to dead area is minimized, but the rigidity of the backing net may be compromised
Solution Approach 1:
The longitudinal beams are designed with local quality variation where the height changes along the length. The beams have greater height in mid-sections where rigidity is most needed for preventing deflection, while the height is reduced towards the ends where they attach to the filter media, minimizing the thickness contribution to dead area while maintaining necessary structural strength.
Data Source
Figure 1
Figure 2a~2b
Figure 2c
AI summary
The present invention relates to backing net (10) for a filter media (30). The backing net (10) comprises a plurality of longitudinal beams (11) and at least one cross beam (12). The height of at least one of the longitudinal beams (11) varies along the length of the longitudinal beam (11) such that said height is reduced towards the first end thereof. The invention also relates to a filter media and a V-type filter having such backing net (10).