Chevron Seal Conforming to Non-Round Filter Holes
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Solution Overview
Problem
Existing filter seals, such as O-ring gaskets, fail to provide a reliable seal when the sealing surface is out of round or has excessive roughness, leading to leakage issues, especially with imperfectly manufactured filter housings or pipes.
Innovation Solution
A filter element with a chevron seal featuring an elastomeric gasket having an annular sealing flange and base portion, capable of conforming to non-round openings with up to 0.25 inches variance in diameter and surface roughness up to 90 micro-inches, providing a resilient and flexible sealing solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional O-ring gaskets are used, then the sealing structure is simple, but the seal fails when the sealing surface is out of round or has excessive roughness, leading to leakage
Solution Approach 1:
The invention uses a flexible elastomeric gasket with a specific cross-sectional geometry that can deform to conform to non-round sealing surfaces. The gasket's flexible nature allows it to adapt to surface imperfections while maintaining sealing integrity, directly addressing the limitation of rigid or less flexible O-ring gaskets.
Solution Approach 2:
The invention changes the geometric parameters of the gasket, specifically using a cross-section with a first radius of curvature in the sealing direction and a second radius of curvature perpendicular to it. This parameter optimization enables the gasket to better conform to imperfect surfaces while maintaining structural integrity.
2Reliability
If filter housings are tightly tolerance'd to ensure proper sealing, then sealing performance improves, but manufacturing cost and complexity increase
Solution Approach 1:
The gasket's optimized cross-sectional parameters (first and second radii of curvature) enable it to compensate for variations in sealing surface dimensions and roundness, allowing filter housings to be manufactured with relaxed tolerances while maintaining sealing performance.
Solution Approach 2:
The gasket concentrates its sealing capability at the specific contact interface where it conforms to the sealing surface, while the rest of the gasket structure provides support and flexibility. This localized sealing action allows the overall housing to be manufactured more easily without requiring tight tolerances throughout.
3Ease of manufacture
If O-ring gaskets are used with imperfect sealing surfaces, then manufacturing is easier, but leakage occurs due to the seal's inability to conform to non-round openings
Solution Approach 1:
The flexible elastomeric gasket can deform to match non-round sealing surfaces, maintaining seal integrity even when the housing is manufactured with standard tolerances. This flexibility compensates for manufacturing imperfections that would cause leakage with traditional O-ring gaskets.
Solution Approach 2:
The gasket's ability to dynamically deform and conform to the sealing surface during installation and operation allows it to adapt to variations in housing roundness and dimensions, ensuring reliable sealing without requiring precise manufacturing control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chevron seal effectively prevents fluid bypass, even with imperfectly manufactured surfaces, offering improved sealing performance and flexibility in design and manufacturing, surpassing the limitations of traditional O-ring gaskets.
Implementation Method 1
The gasket is elastomeric with sufficient resiliency and flexibility to conform and seal to a non-round opening with up to at least 0.01 inch, more preferably up to 0.1 inch, and most preferably 0.25 inch in a diameter variance from round
Data Source
AI summary
A filter element having an end cap is provided with a seal that can better accommodate non-round holes. The seal may be a chevron type seal and/or other similar seal having a sealing flange for forming a radial seal. Methods of replacing a filter having an O-ring gasket to improve upon sealing are provided as well as filtration systems employing the filter element.