Water Filter Assembly With Keyed Cartridge Alignment
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Solution Overview
Problem
Conventional water purifying filter assemblies are prone to incorrect assembly during filter replacement, leading to internal leakage and reduced performance due to user carelessness.
Innovation Solution
The assembly includes filters with recessed portions and corresponding protrusions on the filter case, ensuring correct alignment and preventing incorrect assembly by engaging these features, along with guide grooves and interference ribs to secure the filters in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter assemblies are used without special engagement structures, then the device complexity is low and ease of manufacture is good, but incorrect assembly occurs frequently during filter replacement leading to internal leakage and reduced reliability
Solution Approach 1:
The filter assembly employs asymmetric engagement structures where the filter cartridge includes a protrusion that fits into a corresponding recess in the filter holder, and the filter holder has a unique shape that only accommodates the correct filter type. This asymmetric design prevents incorrect assembly by allowing only the proper filter orientation and type to be installed, thereby improving reliability without significantly increasing complexity
Solution Approach 2:
The engagement structures (protrusion and recess) act as intermediary elements between the filter cartridge and filter holder. These intermediaries ensure correct alignment and positioning during assembly, preventing internal leakage by ensuring proper connection between components. The intermediary structures mediate the assembly process to guarantee reliability
2Reliability
If multiple filters with different types are provided, then water purification performance is improved, but the risk of incorrect assembly increases due to user carelessness
Solution Approach 1:
Each filter type is assigned a unique asymmetric engagement structure with specific protrusion and recess configurations. This allows multiple different filter types to be used for different purification stages while the asymmetric design intuitively guides users on correct installation orientation, maintaining ease of operation while preventing incorrect assembly
Solution Approach 2:
The engagement structures provide immediate feedback to users during the assembly process. When the correct filter is inserted, the protrusion fits smoothly into the recess, providing tactile confirmation of correct assembly. If the wrong filter is attempted, the mismatched shapes prevent assembly, providing clear feedback that the incorrect filter cannot be installed
3Productivity
If filters are arranged to allow water to flow in a certain direction, then water purification efficiency is improved, but incorrect assembly due to user error can cause internal leakage
Solution Approach 1:
The filter holder and filter cartridge are designed with asymmetric engagement features that enforce the correct flow direction. The protrusion on the filter cartridge must align with the recess in the filter holder in a specific orientation, which naturally ensures water flows through the filters in the intended direction, preventing both incorrect assembly and internal leakage
Data Source
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AI summary
A water purifying filter assembly (1) comprising: a filter (100); a filter case (200) comprising a receiving member (210) receiving the filter (100); and a head assembly (400) mounted on one side of the filter case (200) and coupled to the filter (100) by rotation, wherein the filter (100) comprises a recessed portion (116, 126, 136) provided on an outer circumferential surface thereof, the recessed portion (116, 126, 136) being formed as an inward depression along a rotational direction of the filter (100), wherein the receiving member (210) comprises a protrusion (241, 242, 243, 244) formed in a shape corresponding to the recessed portion (116, 126, 136).