Intermittent Coupling Filter Element Removal
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Solution Overview
Problem
In filter assemblies, the coupled relationship between the filter element and the housing cover leads to premature seal failure due to pressure fluctuations, and requires excessive rotational force for removal, necessitating an intermittent connection for easier filter element replacement.
Innovation Solution
An intermittent coupling mechanism between the filter housing cover and the filter element, featuring angled or ramped structures on either the cover or filter element, allowing axial movement of the filter element during cover rotation, which reduces the force needed for removal and prevents seal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filter element is continuously coupled to the cover during removal, then the filter element is securely held during replacement, but excessive rotational force is required to overcome frictional engagement of seals
Solution Approach 1:
The coupling between the filter element and cover is segmented rather than continuous. The filter element includes discrete coupling features (such as protrusions or tabs) that engage with corresponding features on the cover, providing intermittent coupling only during specific phases of removal. This segmentation allows the filter element to be held during replacement while reducing continuous frictional engagement during rotation.
Solution Approach 2:
The coupling mechanism transitions from a static continuous coupling to a dynamic intermittent coupling. During cover rotation, the coupling features engage and disengage at specific points in the rotational cycle, creating a dynamic interaction that reduces average frictional force while maintaining secure holding during the replacement operation.
2Productivity
If the filter element is coupled to the cover, then the filter element is removed together with the cover, but pressure fluctuations cause relative movement and wear on seals
Solution Approach 1:
The coupling is segmented into discrete engagement points rather than continuous contact. This segmentation minimizes the contact area between the filter element seals and the housing, reducing friction and wear during pressure fluctuations while still providing sufficient coupling to ensure the filter element is removed with the cover.
Solution Approach 2:
The coupling provides partial engagement rather than full continuous coupling. The coupling features engage only during specific phases of the removal process, providing just enough coupling to ensure efficient removal while avoiding excessive coupling that would cause seal wear during normal operation.
3Ease of operation
If the filter element rotates with the cover during removal, then the filter element is securely held, but excessive rotational force must be applied to overcome seal friction
Solution Approach 1:
The rotational coupling is segmented into discrete engagement points. Instead of continuous rotational coupling that creates constant friction, the coupling features engage at specific intervals during rotation, allowing the cover to rotate with minimal friction while still providing secure holding during the replacement operation.
Solution Approach 2:
The coupling features act as intermediaries between the cover and filter element. These intermediary features transmit force only during specific phases of rotation, rather than maintaining continuous force transmission. This intermediary coupling reduces the rotational force required while still ensuring the filter element is securely held during replacement.
Data Source
AI summary
A filter assembly has a threaded cover that mates with a complementary thread on the filter housing. Rotation of the housing cover in a first direction moves the cover axially away from the housing, and rotation of the housing cover in a second direction opposite the first direction moves the cover axially toward the housing. An intermittent coupling between a filter housing cover and a filter element applies intermittent axial forces to the filter element as the housing cover is rotated in the first direction to separate the filter element from the housing along with the cover. The intermittent coupling includes components on the inside of the filter cover that engage with complementary components on the filter element during each revolution of the cover.