Biplanar O-ring Seal for Hydraulic Filter End Cap
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Solution Overview
Problem
Existing hydraulic filtration systems face challenges in maintaining a positive seal between the filter element and the filter head, particularly due to the limitations of traditional O-ring designs which lack flexibility and space for instrumentation, leading to potential leaks and restricted fluid flow.
Innovation Solution
A filter end cap with a cylindrical sleeve and base, featuring a notched locating feature and a biplanar O-ring seal that sits in a seal groove with segments in multiple planes, allowing for alignment with a relief feature in the filter head, providing a secure seal while accommodating instrumentation and enhancing fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional O-ring seal design is used in a straight cut or radial seal gland, then the seal structure is simple, but the seal reliability is insufficient and leakage may occur
Solution Approach 1:
The seal groove transitions from a traditional single-plane radial design to a biplanar configuration with first and second planar segments at different orientations. This dimensional change allows the O-ring seal to compress against surfaces in multiple planes, creating enhanced sealing paths that prevent leakage while maintaining structural feasibility.
Solution Approach 2:
The seal groove is divided into multiple discrete planar segments (first planar segment and second planar segment) rather than being a single continuous surface. This segmentation allows each plane to contribute to the sealing action independently, improving overall seal reliability through multiple sealing zones.
2Reliability
If a sloped or angled seal gland design is used, then the seal performance is improved, but the space for instrumentation is reduced
Solution Approach 1:
By implementing a biplanar seal groove rather than a single sloped plane, the design creates vertical separation between sealing functions and instrumentation space. The first and second planar segments are oriented differently, allowing instrumentation to be positioned in the axial direction without interfering with the sealing surfaces.
Solution Approach 2:
The seal groove is segmented into distinct planar sections that can be positioned at different axial locations. This segmentation allows the sealing function to be distributed across multiple planes while leaving adequate axial space for instrumentation components.
3Productivity
If a traditional O-ring seal design is used, then the device complexity is low, but the fluid flow efficiency is restricted due to pressure drop
Solution Approach 1:
The biplanar seal groove configuration creates a more efficient sealing path that reduces resistance to fluid flow. By distributing the sealing action across two planes, the design minimizes the pressure drop associated with traditional single-plane seals, thereby improving fluid flow efficiency through the filter element.
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 solution ensures a reliable seal and improved fluid flow by allowing the O-ring seal to compress in multiple planes, reducing pressure drop and providing space for instrumentation, thus addressing the limitations of traditional O-ring designs.
Implementation Method 1
The seal is configured to compress radially inwardly against the outer surface of the sleeve when the filter element is assembled to the filter head
Implementation Method 2
The fluid passes through the filter element, which separates particles and other contaminants from the fluid
Data Source
AI summary
A filter element having an end cap with a base and a sleeve surrounding a central aperture in the base and projecting axially outwardly therefrom, where the sleeve includes i) a notched locating feature in a distal edge of the sleeve; and ii) a seal surrounding the outer surface of the sleeve and having planar segments, with a first planar segment located between the locating feature and the distal edge of the sleeve, and a second planar segment, extending along a plane different from the first planar segment, located between the notched locating feature and the base. In an alternate embodiment, the sleeve includes an axially-extending locating feature on an outer surface thereof.