Water Filter Cap Assembly with Sawtooth Anti-Rotation Ring
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Solution Overview
Problem
Existing water filter cartridges face issues with self-uncoupling during installation or removal, leading to potential pressure release and safety hazards, and require permanent sealing methods that prevent reuse or recycling.
Innovation Solution
A water filter cartridge design featuring a cap with sawtooth indentations and a ring with opposing sawteeth to prevent rotation, ensuring secure attachment during installation and removal, allowing for easy separation without destruction, and enabling reuse through a removable ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap is permanently sealed to the body using adhesives or welding, then the reliability of pressure containment is improved, but the ease of operation for replacement and recycling is worsened
Solution Approach 1:
The sealing structure is divided into two separable parts: a permanent seal between the body and ring, and a removable connection between the cap and ring. This allows the cap to be removed for filter replacement while maintaining pressure containment during operation, resolving the contradiction between reliable sealing and ease of replacement.
Solution Approach 2:
The ring acts as an intermediary component that mediates between the body and cap. It provides a permanent attachment to the body while allowing temporary attachment to the cap, enabling both pressure containment and easy removal of the cap for filter replacement and recycling.
2Ease of operation
If the cap is made removable for easy replacement, then the ease of operation is improved, but the reliability of pressure containment is worsened due to potential self-uncoupling
Solution Approach 1:
The ring is pre-attached to the body with permanent sealing before the cap is installed. This preliminary action ensures pressure containment is established before the removable cap connection is made, allowing easy filter replacement while maintaining reliability during operation.
Solution Approach 2:
The ring serves as an intermediary that provides permanent attachment to the body, ensuring reliable pressure containment, while still allowing the cap to be easily removed and reattached for filter replacement without compromising the sealed connection between ring and body.
3Reliability
If anti-rotation features are added to prevent self-uncoupling, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The anti-rotation function is merged into the existing ring component rather than adding separate anti-rotation mechanisms. The sawtooth features are integrated into the ring's structure, providing both sealing and anti-rotation functions in a single element, thus improving reliability without significantly increasing complexity.
Solution Approach 2:
Sawtooth features with asymmetric tooth orientations are incorporated into the ring and cap interfaces. The asymmetric geometry provides inherent anti-rotation capability by creating mechanical interference in one rotational direction while allowing controlled assembly in the opposite direction, improving reliability with minimal added complexity.
Data Source
AI summary
A water filter assembly has a body with the neck, a filter received in the interior of the body, a cap threadedly affixed to the neck of the body, and a ring extending around the neck of the body. The ring has a plurality of elements that are engageable with a surface at the edge of the cap so as to prevent rotation of the cap with respect to the body. The surface at the edge of the cap has a plurality of indentations therein. The plurality of elements include a plurality of sawteeth that are engageable with the plurality of indentations. The ring has another plurality of sawteeth on an opposite side of the ring that are engageable with indentations formed in a shoulder of the body when the cap is rotated to a sealed position with respect to the body.