Polygonal Filter Cartridge Interface for Water Tank Compatibility
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Solution Overview
Problem
Existing water filter cartridges in kitchen equipment and appliances often lead to operational issues due to the use of incorrect or inadequate filter types, resulting in suboptimal water quality and potential machine defects, as they lack effective mechanisms to ensure only permissible filter cartridges are used.
Innovation Solution
A water filter cartridge with a polygonal contour connecting element that interlocks with a complementary structure on the tank or appliance, providing a sealing and fixing mechanism to ensure only compatible cartridges can be used, thereby preventing incorrect filter usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter cartridge connection is used, then the filter cartridge can be easily inserted and removed, but incorrect or incompatible filter cartridges can be used leading to operational issues and machine defects
Solution Approach 1:
The connecting element is given an asymmetric polygonal contour (e.g., hexagonal, rectangular) instead of a symmetric circular shape. This asymmetric geometry creates a unique fit between the filter cartridge connecting element and the tank connecting structure, allowing only compatible cartridges to be installed in the correct orientation. The asymmetric design prevents incorrect cartridges from being inserted while maintaining straightforward installation for the correct cartridge type.
2Reliability
If a polygonal contour connecting element is used, then only compatible filter cartridges can be used ensuring reliable operation, but the connection structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into the single polygonal contour connecting element: it serves as both the mechanical attachment interface and the coding/identification system. The same geometric shape that provides structural connection also prevents incorrect installation, eliminating the need for separate coding mechanisms or additional verification components. This merging approach increases reliability while minimizing added complexity.
Solution Approach 2:
The polygonal connecting element serves multiple purposes simultaneously: it provides mechanical support for the filter cartridge, creates a sealing interface, and acts as a coding system to ensure compatibility. This multi-functional design achieves reliable operation without requiring separate dedicated components for each function, thereby limiting the increase in device complexity.
3Reliability
If a polygonal contour connecting element is used, then only permissible filter cartridges can be used, but the manufacturing process becomes more complex
Solution Approach 1:
The polygonal connecting element is designed as a separate, modular component that can be manufactured independently and then attached to the filter cartridge. This segmentation allows the complex polygonal shape to be produced using standard molding or machining processes for the connecting element itself, while the main filter cartridge body can be manufactured using conventional methods. The modular approach simplifies the overall manufacturing process despite the complex geometry of the connecting element.
Data Source
AI summary
A tank filter combination is provided for appliances which use water, in particular domestic appliances or appliances for preparation of foodstuffs and/or drinks, such as automatic drinks machines, in particular automatic coffee machines, drinking water dispensers, cooking and baking appliances, steamers, in particular steam irons, steam cleaners, high-pressure cleaners, air cleaners and air conditioners, etc. having a suction connection on the tank for suction of water from the tank at a reduced pressure, and a filter connection for connection of a filter cartridge in the interior of and/or outside the tank to ensure use of a permissible filter type. A filter cartridge according to the invention is distinguished by mechanical coding structures with a polygonal structure on the circumferential surface on the output side of the filter cartridge to prevent the use of a filter cartridge which does not correspond to the tank.