Pleated Filter Spacer Reduces Differential Pressure Drop
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Solution Overview
Problem
Conventional pleated filter elements experience high differential pressure drops due to inefficient downstream gap drainage, leading to increased parasitic losses and reduced filtration efficiency, especially in high-pressure applications like engine lube oil and hydraulic fluid filtration.
Innovation Solution
Incorporating a support structure with a spacer that increases the downstream gap between pleats, reducing the differential pressure drop by enhancing the transverse intrinsic permeability and improving drainage flow, thereby minimizing parasitic losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional support structure is used to maintain the downstream gap open during high differential pressure conditions, then structural support is provided, but the transverse flow width is limited and differential pressure drop increases
Solution Approach 1:
The support structure is folded into two layers within the downstream gap, creating a three-dimensional configuration that increases the transverse flow width. This dimensional change allows fluid to flow through a larger cross-sectional area, reducing the differential pressure drop while the folded structure maintains structural support capability.
Solution Approach 2:
The support structure is divided into multiple segments (first layer and second layer) that are positioned at different locations within the downstream gap. This segmentation allows each layer to contribute to both structural support and fluid flow pathways, enabling the structure to provide support while minimizing pressure drop.
2Productivity
If the support structure is folded into two layers within the downstream gap, then transverse flow width is increased, but the gap between outer surfaces decreases
Solution Approach 1:
A spacer is introduced as an intermediary element between the first layer and second layer of the support structure. The spacer maintains a controlled distance between the layers, preventing them from collapsing together while allowing the folded structure to provide increased transverse flow width. This intermediary element resolves the conflict between maintaining gap distance and maximizing flow area.
3Loss of energy
If a spacer is added to increase the distance between support structure layers, then differential pressure drop is reduced, but device complexity increases
Solution Approach 1:
The spacer is integrated with the support structure layers through attachment mechanisms, merging the spacing function with the structural support function. This integration reduces the number of separate components and simplifies assembly, offsetting the added complexity of introducing the spacer element.
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 solution significantly reduces the overall differential pressure drop and parasitic losses, improving filtration efficiency and reducing wear on engine components by lowering the pressure required for fluid flow, thus extending engine life and reducing the risk of premature bypass valve opening.
Implementation Method 1
reducing the differential pressure drop by enhancing the transverse intrinsic permeability and improving drainage flow
Implementation Method 2
significantly reduces the overall differential pressure drop
Data Source
AI summary
A filter element for filtering a fluid that comprises a pleated filter media and a support structure. The pleated filter media comprises pleats that define an upstream gap along an upstream surface of the pleated filter media and a downstream gap along a downstream surface of the pleated filter media. The support structure extends along the downstream surface of the pleated filter media and supports the pleats. The support structure is folded into two layers comprising a first layer and a second layer within the downstream gap. The first layer inner surface and the second layer inner surface are positioned adjacent to each other within the downstream gap. The support structure comprises at least one spacer that increases a distance between the first layer outer surface and the second layer outer surface such that the differential pressure drop through portion of the support structure that is within the downstream gap is decreased.