Filter Media Anchor Seal Bar for Airtight Frame Sealing
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Solution Overview
Problem
Existing filter elements face challenges in creating a consistent, robust seal between the filter media and the frame, particularly at the upstream end, which complicates manufacturing and increases time due to limited space and the need for adhesive seals that require specialized equipment and curing processes.
Innovation Solution
A novel filter element design that combines adhesive and mechanical retention techniques, using seal bars and media anchor channels to create a sealed interface between the filter media and the frame, ensuring a consistent, robust seal around the entire frame, particularly at the upstream end, thereby simplifying manufacturing and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive seals are used to seal the filter media to the frame, then a seal can be provided, but the manufacturing process becomes complicated and time-consuming due to specialized equipment and curing requirements
Solution Approach 1:
The seal bar is divided into distinct functional segments: a sealing surface for bonding to the filter media, a retention feature (such as a channel or groove) for mechanical retention, and structural portions that provide strength. This segmentation allows the seal to achieve both reliable sealing and easy mechanical installation without requiring adhesive curing time.
Solution Approach 2:
The invention combines multiple sealing functions into a single integrated seal bar component: the sealing surface provides adhesive bonding capability, the retention feature provides mechanical retention, and the overall structure provides structural support. This merging eliminates the need for separate adhesive application and curing steps, thereby improving manufacturing productivity while maintaining seal reliability.
2Reliability
If adhesive seals are used to seal the filter media to the frame, then a seal can be provided, but the manufacturing complexity increases due to specialized dispensing equipment and fixturing requirements
Solution Approach 1:
The seal bar's retention feature (channel or groove) is designed to automatically retain the seal bar within the frame structure during assembly. This self-retaining design eliminates the need for specialized fixturing equipment to hold components in place during adhesive curing, thereby reducing manufacturing equipment complexity while ensuring consistent seal placement.
Solution Approach 2:
The invention replaces the adhesive-only sealing system with a hybrid system that incorporates mechanical retention features (channels, grooves, or interlocking structures) that work in conjunction with the adhesive sealing surface. This substitution reduces dependence on complex adhesive dispensing and curing equipment, simplifying the manufacturing system while maintaining seal consistency.
3Reliability
If the seal is located adjacent the frame to prevent unfiltered air leakage, then filtering effectiveness is improved, but the effective flow area through the media is reduced
Solution Approach 1:
The seal bar is designed with localized sealing surfaces positioned only where needed adjacent to the frame to prevent unfiltered air leakage. The bulk of the seal bar structure is positioned to minimize interference with the filter media's flow area, thereby achieving reliable sealing at critical locations while preserving maximum air flow through the media.
Solution Approach 2:
The seal bar utilizes the third dimension (depth/thickness) to provide sealing functionality adjacent to the frame without encroaching on the two-dimensional flow area of the filter media. By positioning the sealing surface in the depth dimension rather than occupying flow area, the design maintains both filtering effectiveness and adequate flow capacity.
Data Source
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AI summary
A filter element (14), comprising a frame (15) having a pair of side panels (26), at least one of the side panels (26) having a media anchor channel (38) along a distal side edge (37) of the one side panel, filter media (18) supported within the frame (15), the filter media (18) including side edges (66) along opposite sides of the media, one of the media side edges (66) being at least partially received within the media anchor channel (38), adhesive means (80) along the media anchor channel (38) for adhesively sealing the media side edge (66) within the media anchor channel (38), and a seal bar (17) having a configuration that cooperates with the media anchor channel (38) to mechanically retain the media side edge (66) in the media anchor channel (38).