Filter Cartridge Support Ring for Damage-Free Drainage Sealing
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Solution Overview
Problem
Existing filter systems for liquid media, such as fuel or oil, face issues where the closure element is subjected to substantial lateral loads during removal, leading to potential damage and loss of functional efficiency due to unintended rotation and axial displacement, resulting in fragments remaining in the filter head.
Innovation Solution
Incorporating a second positioning element that rotationally fixes the support ring to the filter head during unscrewing, preventing co-rotation and allowing the closure element to be moved axially out of its sealing seat, thus preventing excessive lateral loads and ensuring reliable removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filter is demounted by unscrewing movement, then the closure element is released from its sealing seat, but the support ring rotates opposite to the screw-in movement causing lateral load on the closure element
Solution Approach 1:
A second positioning element is introduced as an intermediary mechanism between the support ring and the filter head. This positioning element engages with a corresponding feature on the filter head to prevent rotational movement during unscrewing, while allowing the closure element to be released from its sealing seat through axial movement only.
Solution Approach 2:
The positioning element is designed to be dynamically engaged during the removal process. It initially prevents rotation when the filter begins to unscrew, then disengages to allow the support ring to rotate freely once the closure element has been cleared from the sealing seat, enabling complete removal without damage.
2Reliability
If the closure element is configured as a sealing plug, then sealing performance is improved, but the closure element is more susceptible to lateral loads and damage during removal
Solution Approach 1:
The second positioning element provides beforehand protection by preventing rotational movement that would generate lateral loads on the closure element during the critical removal phase. This protective measure is in place before any damage can occur, cushioning the closure element against forces that would compromise its integrity.
3Ease of operation
If the support ring is allowed to rotate during unscrewing, then simple handling is maintained, but fragments may remain in the filter head causing damage
Solution Approach 1:
The second positioning element applies preliminary anti-action by preventing the rotational movement that would cause the closure element to tear off and leave fragments in the filter head. This preventive measure counteracts the harmful effect before it can manifest, ensuring complete removal of the closure element without damage.
Data Source
AI summary
A filter system for liquid has a filter head with drainage channel and stop element. A filter cartridge is mounted by screw-in movement at the filter head and has a support ring rotatably fastened to its housing part. The support ring has an eccentric closure element and a first positioning element guided toward the stop element by the screw-in movement to position the support ring at the filter head in a rotational position for axially aligning closure element and drainage channel. The closure element is transferred axially into a sealing seat at the filter head to close the drainage channel when screwing on the filter cartridge. The support ring has a second positioning element holding the support ring in a rotationally fixed position at the filter head when unscrewing the filter cartridge so that the closure element is moved out of the sealing seat only in an axial direction.