Non-Circular Filter Element Anti-Rotation Seal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air cleaners used in environments subject to vibration, such as over-the-highway trucks and off-road vehicles, face issues where the filter element rotates within the housing, compromising the seal between the filter element and the housing, leading to ineffective filtration.
Innovation Solution
A filter element design with non-circular outer walls and end caps, which rotationally interfere with the housing cover to prevent internal rotation, ensuring a secure seal and effective filtration by engaging a polygon-shaped outer radial periphery with a corresponding polygon-shaped inside surface of the cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filter element is designed with a circular outer wall for ease of installation, then the ease of operation is improved, but the filter element rotates within the housing under vibration, compromising the seal and reducing reliability
Solution Approach 1:
The patent applies asymmetry by changing the filter element's outer wall from a circular shape to a non-circular shape with apices (protrusions). This asymmetric geometry prevents rotation within the housing by creating a unique orientation that must align with corresponding features in the housing, thereby maintaining seal integrity under vibrational conditions while still allowing for straightforward installation of the correctly oriented element.
2Reliability
If the filter element is secured firmly in the housing to prevent rotation, then the reliability is improved, but the filter element cannot be easily removed and replaced, reducing ease of operation
Solution Approach 1:
The asymmetric non-circular outer wall with apices creates a friction fit and orientation lock within the housing that prevents rotation during operation. The design allows the element to be easily inserted and secured in the correct orientation, while the same asymmetric features prevent removal unless the element is pulled straight out along its insertion path, thus maintaining both reliability and ease of replacement.
Data Source
AI summary
An air cleaner having a housing body and a removable cover and a filter element, in which the cover and the filter element rotationally interfere with each other by engagement between an inside surface of the cover and an outer radial periphery of the filter element. A filter element includes a pair of end caps, filter media, and an outer wall on the end cap circumscribing the filter media, in which the outer wall is non-circular. A method of installing a filter element into a housing includes orienting a cover over an element and a housing body by engaging an inside surface of the cover and an outer radial periphery of the filter element to rotationally interfere with each other.