Filter Cartridge Cover Opaque Extension for ESLI Masking
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Solution Overview
Problem
Existing filter cartridges with end-of-service-life-indicators (ESLIs) face challenges in accurately indicating when to replace the filter due to progressive color changes, requiring user training and precise sensor placement, which complicates manufacturing and can lead to errors in determining the end of the filter's service life.
Innovation Solution
A filter cartridge design that includes a housing with a sidewall and a cover having an opaque extension with a window, allowing the ESLI to be viewed through both the sidewall and the extension, simplifying sensor placement and eliminating the need for additional manufacturing steps or parts, thereby ensuring accurate indication of the end-of-service-life without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a transparent sidewall or shell is used to view the ESLI, then the ESLI can be visualized, but progressive color changes make it difficult to assess when replacement is needed
Solution Approach 1:
The patent uses an opaque border that creates a sharp visual contrast with the sensor display field. This border changes the visual characteristic from a gradual color gradient to a distinct boundary, making it easier for users to identify when the filter cartridge needs replacement without requiring training to interpret progressive color changes.
2Measurement precision
If adhesive labels are used to mask the sensor area, then only the response zone can be viewed, but placement accuracy is difficult to achieve during mass manufacturing
Solution Approach 1:
The patent integrates the masking function directly into the housing structure by forming an opaque border as a built-in feature. This merges the sensor masking function with the housing manufacturing process, eliminating the need for separate adhesive label application and ensuring consistent positioning without additional manufacturing steps.
Solution Approach 2:
The housing structure itself provides the masking function through its integrated opaque border design. The housing serves dual purposes: containing the sensor and providing the visual boundary for the response zone, eliminating the need for external masking components and simplifying the manufacturing process.
Data Source
AI summary
A filter cartridge 12 that includes a sorbent filter material 42, an end-of-service-life (ESLI) indicator 40, a housing, and a housing cover 24. The housing 22 has a sidewall 26 that has a window pane that allows the ESLI 40 to be viewed through it. The cover 24 is secured to a first perimeter 28 of the housing sidewall 26 and has an air throughput surface 32 and an opaque extension 36. The opaque extension 36 is positioned on the cover 24 such that the extension is juxtapositioned against an outer surface of the housing sidewall 26. The cover extension 36 also has a window pane located in it so that the ESLI 40 may be viewed through it too. The provision of an opaque extension 36 on the cover 24 and a window 38 in the extension 36 allows the ESLI 40 to be appropriately masked such that the sensor registration position is consistently achieved during manufacture of the filter cartridge 12.