Water Filter Coupling Geometry to Prevent Misassembly Leaks
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Solution Overview
Problem
Incorrect assembly of water filters in filter assemblies can lead to internal leakage and reduced water purification performance due to user carelessness during filter replacement.
Innovation Solution
A water purifying filter assembly with a receiving member and head assembly that includes protrusions and recessed portions to ensure proper filter coupling, preventing incorrect assembly by interfering with the coupling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If filters are designed with simple coupling structures, then ease of operation is improved, but reliability deteriorates due to incorrect assembly
Solution Approach 1:
The filter case includes protrusions with asymmetric shapes (e.g., L-shaped, J-shaped, or asymmetric arc-shaped) that correspond to asymmetric recesses on the filter. This asymmetric design ensures that only the correct filter type can be properly inserted and coupled to the filter case, preventing incorrect assembly while maintaining simple operation for the correct filter type.
2Reliability
If filters are designed with complex coupling structures, then reliability is improved by preventing incorrect assembly, but device complexity increases
Solution Approach 1:
The coupling structure is segmented into distinct functional elements: protrusions on the filter case, corresponding recesses on the filter, and an interference rib with a guide surface. This segmentation allows each element to perform its specific function (positioning, coupling prevention, and assembly guidance) while keeping the overall structure relatively simple and easy to manufacture.
3Reliability
If protrusions are made larger to prevent incorrect assembly, then reliability is improved, but ease of operation deteriorates due to difficulty in alignment
Solution Approach 1:
The interference rib acts as an intermediary element between the filter and filter case during assembly. Its guide surface provides a tapered pathway that guides the filter into proper alignment with the protrusions, making the assembly process easier despite the presence of large protrusions that prevent incorrect coupling.
Data Source
AI summary
A water purifying filter assembly including a filter case including a receiving member having a protrusion; and a head assembly. The protrusion may be configured to be receivable in a recessed portion on an outer circumferential surface of a filter so that when the filter is placed in the receiving member with the protrusion received in the recessed portion, the filter is fixedly couplable to the head assembly by rotation of the filter, and when the filter is placed in the receiving member with the protrusion not received in the recessed portion, the filter is prevented from being fixedly couplable to the head assembly.