Water Filter Engagement Protrusion with Curved Segments
Solution Overview
Problem
Existing water filter systems face challenges in securely interfacing with filter head assemblies, leading to potential leaks and cross-contamination due to inadequate engagement mechanisms.
Innovation Solution
A water filter unit with a body portion featuring a laterally extending key member and an engagement protrusion with distinct curvature segments, designed to engage with a filter head assembly's key slot and guides, ensuring secure rotational and longitudinal alignment and preventing cross-contamination through seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple engagement mechanism is used, then the device complexity is reduced, but the reliability of the interface connection deteriorates leading to potential leaks and cross-contamination
Solution Approach 1:
The engagement mechanism is segmented into multiple functional components: a key member with laterally extending features, an engagement protrusion with curved surfaces, and multiple engagement surfaces (first, second, and third segments). Each segment performs a specific function in the engagement sequence, distributing the reliability requirements across multiple simple rather than one complex mechanism.
Solution Approach 2:
The key member and engagement protrusion feature asymmetric geometries including laterally extending keys, curved engagement surfaces with different radii of curvature, and segmented engagement surfaces at different angles. This asymmetry prevents improper installation and ensures reliable engagement in the correct orientation, addressing reliability without requiring complex active control mechanisms.
2Reliability
If a secure engagement mechanism is implemented, then the reliability of the interface connection is improved, but the device complexity increases
Solution Approach 1:
The engagement mechanism is designed to be self-aligning and self-locking through its geometric features. The key member automatically aligns with the key slot, the curved engagement protrusion surfaces guide the filtering element into proper engagement, and the segmented engagement surfaces lock the connection without requiring external actuators, sensors, or control systems. This achieves high reliability through passive geometric constraints rather than active complex mechanisms.
3Reliability
If a complex engagement mechanism is used, then the reliability of the interface connection is improved, but the ease of operation deteriorates making installation and removal difficult
Solution Approach 1:
The engagement protrusion incorporates curved surfaces with different radii of curvature that guide the filtering element into proper engagement during installation. The curved geometry provides mechanical guidance that simplifies the installation motion to a simple push-and-rotate action, while the curvature profiles ensure reliable engagement. The same curved features facilitate removal by reversing the motion, maintaining ease of operation despite the robust engagement mechanism.
Solution Approach 2:
The engagement mechanism transitions from a loose state during insertion to a locked state during operation. The segmented engagement surfaces and key member are designed to engage in a specific sequence during installation, with each segment locking progressively to create a secure connection. During removal, the reverse sequence occurs, allowing easy disengagement. This dynamic engagement process achieves high reliability without permanently complicating the operation.
4Device complexity
If inadequate engagement mechanisms are used, then the device complexity is reduced, but harmful factors increase due to potential leaks and cross-contamination
Solution Approach 1:
The sealing interface is segmented into multiple engagement surfaces (first, second, and third segments) that create separate sealing zones. This segmentation ensures that leaks are prevented at multiple locations along the interface, and cross-contamination between filtered and unfiltered water streams is blocked by multiple barrier zones rather than a single potential failure point.
Solution Approach 2:
The asymmetric geometry of the key member and engagement protrusion creates a unique fit that prevents improper installation. The laterally extending key features and curved surfaces with different radii ensure that the filtering element can only engage in the correct orientation, where the sealing surfaces are properly aligned. This prevents leaks and cross-contamination that would occur with misaligned or improper engagement, without requiring complex active sealing mechanisms.
Data Source
AI summary
A filter unit includes a body portion having a proximal end and a distal end. First and second engagement surfaces traverse at least part of the body portion. The first and second engagement surfaces include a first segment that extends substantially parallel with the longitudinal extent of the body portion. A second segment extends at an angle relative to the longitudinal extent of the body portion. A third segment extends at a different angle than the second segment. A laterally extending key member is disposed on the body portion between the first engagement surface and the second engagement surface. An engagement protrusion extends from the proximal end. The engagement protrusion has a first portion that includes a first radius of curvature and a second portion opposing the first portion that includes a second radius of curvature that is larger than the first radius of curvature.