Water Filter Cartridge Keyed Engagement and Bypass Valve
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Solution Overview
Problem
Conventional water filter systems face issues with seal deterioration leading to leaks, improper cartridge alignment, and the need for separate shutoff valves during cartridge replacement, especially in tight spaces under sinks.
Innovation Solution
A water filter cartridge with check valves in the inlet and outlet ports and a bypass disk with a rotating conduit that allows water to bypass the cartridge during replacement, eliminating the need for a separate shutoff valve and facilitating easy alignment and leakage prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter cartridges use manual or automatic shutoff valves, then leakage can be controlled during cartridge replacement, but the seals deteriorate over time causing irritating leaks
Solution Approach 1:
The patent removes the traditional shutoff valve mechanism and its associated seals from the system. Instead, it uses a bypass conduit that creates a separate flow path, eliminating the need for seals that would deteriorate over time while still preventing leakage during cartridge replacement.
Solution Approach 2:
The bypass conduit acts as an intermediary element that provides an alternative flow path during cartridge replacement. This mediator allows water to bypass the cartridge temporarily without requiring seals or valves that would degrade, thus solving the reliability-duration contradiction.
2Volume of moving object
If filter cartridges are installed in tight spaces under sinks, then space is saved, but proper alignment of the cartridge becomes awkward and difficult
Solution Approach 1:
The patent employs asymmetric key formations on the cartridge and corresponding recesses in the head housing. This asymmetric design provides tactile feedback and mechanical guidance that makes alignment intuitive and easy, even in tight spaces under sinks, while maintaining compact installation volume.
3Ease of operation
If conventional key and lock features are used for alignment, then proper engagement is facilitated, but the formations are easily broken or disabled by the user
Solution Approach 1:
The key formations and recesses are pre-configured in a complementary manner that guides the cartridge into proper alignment during insertion. This preliminary structural arrangement ensures correct engagement before the cartridge is fully installed, preventing misalignment damage while maintaining user-friendly operation.
Solution Approach 2:
The patent combines the alignment function and the sealing function into an integrated design where the key formations work together with the O-ring seal and bypass mechanism. This merging creates a more robust system where the alignment features are reinforced by the overall structural integration, improving durability while maintaining ease of operation.
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 solution prevents leaks during cartridge exchange, simplifies the alignment process, and allows for easy cleaning and replacement without additional components, enhancing the reliability and maintenance of the filter system.
Implementation Method 1
The valves are opened when projections depending from the filter head engage each valve, overcoming the inherent closing spring biasing force.
Implementation Method 2
the bypass disk is provided with a water flow bypass conduit that is constructed and arranged to create a bypass flow path in the filter head as the cartridge is replaced
Implementation Method 3
a mating key and lock system, including mating respective formations on the head and cartridge which facilitate proper alignment and engagement between these components
Data Source
AI summary
A water filter assembly is provided, including a filter head including a filter manifold in fluid communication with an existing water line, a head housing connected to the manifold and including landings, an elongate key member depending from a portion of the filter head, and a filter cartridge including a filter housing constructed and arranged to retain a supply of filter media, a filter closure attached to an upper end of the filter housing and having at least an inlet port and an outlet port, the closure configured for engaging the landings of the head housing and also having a recess constructed and arranged to matingly and slidingly accommodate the key member so that, upon engaging the filter head, the filter cartridge is in alignment with the filter head.