Filter Element U-Shape Seal Bar Mechanical Retention
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Solution Overview
Problem
Existing air filter elements face challenges in creating a consistent and robust seal between the filter media and the frame, particularly at the upstream end, which increases manufacturing complexity and time due to limited space and the need for adhesive seals that require specialized equipment.
Innovation Solution
A novel filter element design incorporating a combination of adhesive and mechanical retention techniques, featuring a U-shaped channel and snap-fit tabs to secure a seal bar, ensuring a reliable air-tight seal between the filter media and the frame, while allowing for faster and simpler manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive seal is 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 requiring specialized dispensing equipment and fixtures
Solution Approach 1:
The patent combines mechanical retention features (protrusions and recesses) with adhesive application in a single integrated sealing bar component. The sealing bar includes protrusions that mechanically engage with recesses in the frame while also providing surfaces for adhesive application, merging two sealing approaches into one unified solution that eliminates the need for separate dispensing equipment and fixtures.
Solution Approach 2:
The sealing bar is designed to be self-positioning through its protrusions and recesses mechanism. The mechanical retention features automatically align and secure the sealing bar in the correct position during assembly, eliminating the need for external fixtures to hold the components in place while the adhesive cures, thereby simplifying the manufacturing process.
2Reliability
If adhesive seal is used to seal the filter media to the frame, then a seal can be provided, but specialized dispensing equipment and fixtures are required which increases manufacturing time
Solution Approach 1:
The sealing bar integrates mechanical retention features and adhesive application surfaces into a single component. This merging allows the seal to be applied without specialized dispensing equipment, as the adhesive can be applied using simpler methods while the mechanical features ensure proper positioning and sealing, thereby increasing manufacturing speed.
Solution Approach 2:
The self-positioning mechanism through protrusions and recesses eliminates the need for time-consuming fixture setup and adjustment. The sealing bar automatically finds its correct position during assembly, reducing manufacturing time and increasing productivity while maintaining seal consistency.
3Reliability
If the seal location is adjacent the frame to secure filter media, then the seal can be provided, but the effective flow area through the media is reduced
Solution Approach 1:
The sealing bar is designed with localized protrusions and recesses only at the critical sealing points where the filter media meets the frame. This allows the seal to be effective at the boundaries while leaving the central flow area of the filter media completely open and unobstructed, maximizing the effective flow area while maintaining seal effectiveness.
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 improved sealing structure effectively prevents unfiltered air from leaking, ensuring contaminants are filtered out and reducing manufacturing complexity and time by using mechanical and adhesive means to secure the seal, enhancing the reliability and efficiency of the sealing interface.
Implementation Method 1
The adhesive seal can require a complicated frame structure, specialized dispensing equipment, and can be a challenge to replicate so that an effective seal is provided around the entire frame.
Implementation Method 2
A filter element includes a pleated panel filter media supported within a frame having a U-shaped channel and a snap-fit tab. The snap-fit tab engages with the U-shaped channel to secure a seal bar.
Data Source
AI summary
A filter element includes a frame having an outlet panel and two side panels defining a U-shape. A U-shaped media anchor channel extends along the distal side edge of each panel. Each media anchor channel can have a snap-tab or other locking feature. The element encloses a pleated panel filter media pack having a side edge along each side of the pack. Each side edge of the media pack is located in a media anchor channel, and a bead of adhesive is applied along the channel. A pair of seal bars, each having a u-shape and a snap-tab or other feature that cooperates with the u-shape and the snap-tab of each media anchor channel, is pressed into each channel. Each seal bar mechanically retains a respective media side edge in the channel and together with the adhesive, provides a consistent, robust seal between the media and the frame.