Undulating Filter End Cap Seal for High-Pressure Leak Prevention
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Solution Overview
Problem
Existing filter elements face challenges in maintaining a positive seal with the filter head, particularly under high differential pressures and during the assembly process, due to misalignment issues which can lead to leaks and incorrect element installation.
Innovation Solution
The filter element features a non-planar geometry at its distal end cap that matches the undulating surface of the socket in the filter module, ensuring a fluid-tight seal and preventing proper assembly when out of alignment, with tabs and slots facilitating correct positioning and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a straight cut or radial seal gland design is used, then the seal structure is simple, but the seal reliability deteriorates under high differential pressures and misalignment conditions
Solution Approach 1:
The sealing member is given an undulating or non-planar geometry with multiple lobes rather than a straight or radial design. This curved, wave-like structure allows the sealing surface to conform and maintain contact under misalignment and high pressure conditions, improving seal reliability without significantly increasing structural complexity
Solution Approach 2:
The sealing member's geometry is changed from a simple planar or radial form to an undulating form with varying amplitude and lobe configurations. This parameter change enables the seal to adapt to misalignment while maintaining sealing effectiveness under differential pressure
2Reliability
If a sloped or angled seal gland design is used, then the seal performance is improved, but the assembly complexity increases
Solution Approach 1:
The sealing member features an asymmetric undulating profile with specific lobe configurations that provide directional sealing characteristics. This asymmetric design improves seal performance by creating favorable contact patterns while the modular geometry keeps assembly complexity manageable
3Ease of operation
If the canister is allowed to thread freely onto the head, then the assembly process is simple, but the alignment precision deteriorates leading to leaks
Solution Approach 1:
The undulating sealing member is pre-installed on the end cap before assembly with the filter head. This preliminary action ensures that the sealing geometry is already in place to guide and enforce proper alignment during the threading operation, preventing misalignment without requiring complex alignment procedures
Solution Approach 2:
The undulating sealing member acts as an intermediary element between the end cap and filter head. Its specific geometry mediates the interface, providing both the sealing function and the alignment guidance that ensures precise positioning while allowing a relatively simple threading operation
4Device complexity
If no alignment indication is provided, then the device complexity is low, but the detection of misalignment becomes difficult
Solution Approach 1:
The undulating sealing member creates visible variations in the assembled configuration that serve as indicators of proper alignment. The geometric pattern provides a visual cue system that allows operators to detect misalignment without adding complex sensing or indication devices
Data Source
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AI summary
A filter module includes a filter element with a ring of media and an end cap at one end of the ring. The end cap includes an annular body with a sealing member located around a surface of the body circumscribing a central opening, in which the sealing member has a repeating, undulating, non-planar geometry. The axial, distal end of the annular body also has a repeating, undulating non-planar geometry, matching the geometry of the sealing member, and can have one or more tabs projecting axially outward from the distal end, positioned at a point of maximum amplitude of the distal end, and which are received in cooperating slots formed in a diaphragm socket, to facilitate positioning and installing the element into the module. The socket includes an outer wall having a matching non-planar geometry which receives and seals against the sealing member on the end cap.