Water Filter Cartridge Assembly for Leak-Safe Alignment
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Solution Overview
Problem
Conventional water filtration systems face issues with seal deterioration leading to leaks, awkward cartridge alignment, and excessive plastic waste due to disposable cartridges.
Innovation Solution
A replaceable filter cartridge housed in a filter sump with a sump cap that interlocks with a filter head, featuring radial ramps and locating tabs for alignment, a check valve for water control, and a spring-biased tab for secure engagement, reducing misalignment and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional disposable filter cartridges are used, then filter replacement is simple, but plastic waste increases significantly
Solution Approach 1:
The system is divided into three segments: a permanent filter head, a reusable filter sump, and a disposable filter cartridge. Only the inner cartridge is disposed of after use, while the sump and head are reused. This segmentation reduces plastic waste compared to disposing of entire cartridges, while maintaining ease of replacement by allowing simple cartridge insertion and removal.
Solution Approach 2:
The filter cartridge is nested within the filter sump, which itself is nested within the filter head assembly. This nested structure allows the smaller disposable cartridge to be replaced without removing the larger reusable components, reducing waste while maintaining simple replacement procedures.
2Manufacturing precision
If manual alignment mechanisms are used, then alignment precision can be achieved, but user operation becomes awkward in confined spaces
Solution Approach 1:
The alignment system uses asymmetric keyways and corresponding keys on the cartridge and sump. The elongated keyway in the sump cap that receives a key from the filter head provides automatic alignment in one direction, while the asymmetric ramp surfaces guide the cartridge into proper orientation. This asymmetric design achieves precise alignment without requiring complex manual adjustment mechanisms that would be difficult to operate in confined spaces.
Solution Approach 2:
The alignment system is self-aligning through the interaction of keyed features and ramp surfaces. When the user inserts the cartridge, the keys engage with keyways and the ramps guide the components into proper alignment automatically, without requiring the user to manually position or adjust anything. This self-service alignment is easy to operate even in confined spaces under sinks.
3Ease of operation
If simple engagement mechanisms are used, then ease of installation is improved, but seal reliability deteriorates over time
Solution Approach 1:
The engagement mechanism uses pre-positioned ramps on the sump cap and corresponding keyways on the filter head that are designed to guide and lock the components together during installation. The ramps force proper alignment and secure engagement as the sump is placed onto the head, ensuring reliable seal contact is established before use. This preliminary action during installation ensures long-term seal reliability while maintaining ease of installation.
Solution Approach 2:
The seal interfaces use curved or rounded surfaces rather than sharp edges, allowing for more forgiving alignment during installation while maintaining reliable sealing contact. The rounded engagement surfaces distribute forces more evenly over time, reducing stress concentration that could lead to seal deterioration, while still allowing easy installation.
4Manufacturing precision
If keyed alignment systems are used, then alignment accuracy is improved, but the key features are easily broken or disabled
Solution Approach 1:
The alignment system distributes the alignment function across multiple localized features rather than relying on a single large key. The sump cap includes multiple smaller keys and corresponding keyways, along with ramp surfaces, that work together to achieve accurate alignment. This distribution of alignment functionality across multiple small features makes the system more durable, as individual features are less likely to break while maintaining the same alignment accuracy.
Data Source
AI summary
A filter cartridge housed within a filter sump which mates with a filter head that is in fluid communication with an existing water line, where the filter cartridge includes a filter element having a bottom end and a top end, a bottom cap disposed on the bottom end of the filter element, and a top cap disposed on the top end of the filter element. The top cap includes a disc which is parallel to and spaced a predetermined distance above the top end of the filter element, a cylindrical side wall depending from the disc in a direction of the filter element, an inlet extending from the disc in a direction of the filter head, such that the inlet mates with the filter head, and an outlet which is at least partially disposed within the inlet.