Air Filter Axial Gap Reduces Pressure Loss
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Solution Overview
Problem
Existing air cleaner systems for internal combustion engines suffer from high pressure loss, which results in wasted energy and reduced efficiency.
Innovation Solution
The air cleaner system incorporates a filter element with an annular projection that creates an axial gap between the filter element and the housing, reducing pressure drop by increasing the flow area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional filter element is used without an axial gap, then the sealing is simpler, but the pressure loss is higher due to reduced flow area
Solution Approach 1:
The patent introduces an axial dimension by creating a gap between the filter element and housing, which increases the flow area in the axial direction. This dimensional change allows air to flow through the gap, reducing pressure loss without compromising filtration performance.
Solution Approach 2:
The filter element is segmented into multiple functional zones: the filtration zone (filter media), the sealing zone (annular projection), and the flow channel zone (axial gap). This segmentation allows each zone to perform its specific function optimally, with the axial gap serving as a dedicated flow channel that reduces pressure loss.
2Loss of energy
If the annular projection diameter is large (close to filter media outer diameter), then the sealing is better, but the flow area is reduced increasing pressure loss
Solution Approach 1:
The patent optimizes the annular projection diameter as a critical parameter, setting it to less than 90% of the filter media outer diameter. This parameter change creates the optimal balance between sealing effectiveness and flow area, allowing sufficient gap for air flow while maintaining adequate sealing contact.
Solution Approach 2:
The annular projection provides localized sealing quality at the interface between the filter element and housing, while the axial gap provides localized flow channel quality. This local quality differentiation allows the system to achieve both good sealing and low pressure loss simultaneously.
Data Source
AI summary
An air cleaner system including a housing having a first housing end with an opening, a second housing end, and an inlet proximate the second housing end. The air cleaner system also includes a filter element removably installed within the housing through the opening, the filter element including filter media, a first endplate coupled to the filter media at a first filter end, an open second endplate coupled to the filter media at a second filter end, and an annular projection extending axially from the open second endplate, the annular projection sealing against the housing and creating an axial gap between the filter element and the housing.