Asymmetric Filter Cap Tabs for Water Dispenser Alignment
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Solution Overview
Problem
Existing water filters for water dispensers lack an efficient and secure mechanism for coupling filter cartridges to filter heads, leading to potential misalignment and improper installation, which can result in ineffective filtration and potential damage to the filter head.
Innovation Solution
The proposed solution involves a filter interface with a first inlet on the filter head and a second inlet on the filter cap, along with at least two ledges and tabs positioned asymmetrically to secure the filter cap relative to the filter head. This configuration ensures proper alignment and secure locking through a combination of translation and rotation, preventing misalignment and ensuring fluid communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple coupling mechanism is used to attach the filter cartridge to the filter head, then the device complexity is reduced and ease of manufacture is improved, but misalignment and improper installation occur leading to unreliable filtration
Solution Approach 1:
The filter cap incorporates asymmetric tabs that engage with corresponding asymmetric ledges on the filter head. This asymmetric configuration ensures proper rotational alignment and prevents improper installation, thereby improving filtration reliability without significantly increasing device complexity.
2Device complexity
If no alignment mechanism is provided for the filter cartridge, then the device complexity is reduced, but misalignment occurs resulting in ineffective filtration and potential damage to the filter head
Solution Approach 1:
The asymmetric tabs and ledges are pre-configured to guide the filter cap into the correct rotational position during installation. This preliminary alignment action prevents misalignment before it can cause damage, eliminating the need for additional active alignment mechanisms.
3Reliability
If a secure locking mechanism is implemented to prevent misalignment, then filtration reliability is improved, but the ease of operation for installing and removing filter cartridges deteriorates
Solution Approach 1:
The asymmetric tab and ledge configuration provides inherent alignment and locking functionality that secures the filter cartridge reliably while maintaining ease of operation. The asymmetric features guide installation and prevent removal without requiring additional locking components, thus balancing reliability with operational simplicity.
Data Source
AI summary
A filter interface includes a first inlet positioned on a filter head, a second inlet positioned on a filter cap of a filter cartridge, two ledges positioned on the filter head, and at two tabs positioned on the filter cap. The second inlet is selectively coupled to the first inlet to provide fluid communication between the first inlet and the second inlet while the filter cap is secured relative to the filter head. Each of the tabs protrudes in a radial direction. The filter cap and filter head are coupled by translating the filter cap along an insertion direction and rotating the filter cap about the insertion direction toward a locked position, thereby causing each of the tabs to engage one of the ledges and secure the filter cap relative to the filter head. The tabs are positioned asymmetrically as viewed along the insertion direction.