Filter housing with filter key attachment
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Solution Overview
Problem
Existing water filtration systems in refrigerators are difficult to replace due to complex designs and placements, often requiring manual insertion and removal, which can lead to awkward access and potential spillage during filter changes.
Innovation Solution
A push-actuated filter housing assembly with a floating key lock mechanism that allows for easy attachment and detachment, featuring a filter key with protrusions for secure mating with a filter base, providing a simple and tool-free filter replacement process while preventing spillage through internal shutoff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual insertion and removal mechanisms are used, then filter replacement is possible, but the process becomes complex and difficult to operate
Solution Approach 1:
The filter housing is segmented into a sump portion and a head portion that can be separated, allowing the filter cartridge to be independently removed and replaced. This segmentation simplifies the replacement process by enabling modular maintenance without requiring complex disassembly mechanisms.
Solution Approach 2:
The filter housing assembly incorporates self-latching mechanisms and automatic shutoff valves that activate during replacement without requiring external intervention or complex manual operations. The floating key lock mechanism automatically engages and disengages based on the position of the sump, providing self-service functionality that reduces operational complexity.
2Reliability
If secure locking mechanisms are used to prevent spillage, then leak prevention is improved, but the filter replacement process becomes more difficult
Solution Approach 1:
The locking mechanism transitions from a static locked state to a dynamic unlocked state through the floating key lock mechanism. When the sump is pushed axially during replacement, the floating key automatically disengages from the latching position, allowing the sump to be removed without requiring manual intervention to overcome locked positions. This dynamic behavior maintains reliability during normal operation while enabling easy replacement during maintenance.
Solution Approach 2:
The floating key acts as an intermediary element between the sump and the head assembly. It provides the locking function to prevent spillage during normal operation, yet simultaneously serves as the release mechanism when axial force is applied during filter replacement. This intermediary component resolves the contradiction by being both the lock and the key to unlocking.
3Productivity
If push-actuated release mechanisms are used, then filter replacement speed is improved, but the locking mechanism becomes more complex
Solution Approach 1:
The complex locking and release mechanisms are extracted and consolidated into the floating key component. By concentrating the functional complexity into a single element that performs both locking and releasing functions, the overall system complexity is reduced while maintaining fast replacement capability through the simple axial push action.
4Adaptability or versatility
If keyed identification systems are used to match filter configurations, then compatibility is improved, but the device complexity increases
Solution Approach 1:
The keyed identification system is integrated into the existing floating key lock mechanism, allowing the same component to serve both as the locking element and as the compatibility identifier. Different key configurations can be used to match different filter types, providing universal adaptability without requiring separate identification systems that would increase complexity.
Data Source
AI summary
A filter assembly for fluid filtration having a push-activated lock and release mechanism. A push filter design activates a filter key lock upon insertion and extraction, where the filter key may be used simultaneously as a lock and as an identifier for particular filter attributes. The filter housing assembly may be attached to, and removed from, a filter base by a push-actuated release. Upon insertion, the filter key shifts the filter lock longitudinally to receive interlocking segments. Upon extraction, the same axial push shifts the filter lock further to align the interlocking fingers within gaps that allow for easy extraction. The specific key lock design allows a user to identify and match certain filter configurations received by the mechanical support, and reject other filter configurations.