Filter Element Flow Directing End Cap for Hydraulic Systems
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Solution Overview
Problem
Existing replaceable filter elements for hydraulic fluids and lubricating oils suffer from uneven fluid distribution and contaminant agglomeration, leading to increased pressure drop and reduced element life, as contaminants tend to accumulate in the upper region, causing decreased performance.
Innovation Solution
A filter element design featuring a helical or spiral flow pattern across the upper end cap, directing fluid in a swirling manner along the outer surface, ensuring even distribution of contaminants across the filtration media, thereby enhancing contaminant-holding capacity and reducing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radial flow openings in the upper end cap direct fluid downward in the axial direction, then the filter provides simple structure and tight sealing, but contaminants agglomerate in the upper region causing increased pressure drop and reduced element life
Solution Approach 1:
The patent applies curvature by transitioning from straight axial flow paths to spiral flow paths. The spiral flow members create a curved, rotating flow pattern that moves fluid and contaminants along a spiral trajectory rather than a straight line, distributing contaminants more evenly along the filter media length and preventing agglomeration in the upper region.
Solution Approach 2:
The patent adds a rotational dimension to the flow pattern. By introducing spiral flow members that extend axially and create rotational motion, the flow transitions from a one-dimensional axial path to a two-dimensional spiral path with both axial and circumferential components, improving contaminant distribution.
2Ease of manufacture
If radial flow openings direct fluid downward along the outer surface, then the filter assembly is easy to manufacture and install, but fluid and contaminant distribution becomes uneven across the element
Solution Approach 1:
The spiral flow members introduce curved flow paths that rotate fluid and contaminants around the outer surface of the filter element. This curved, spiral motion ensures that contaminants are distributed more uniformly along the entire length of the filter media rather than concentrating in the upper region, thereby improving overall filtration performance and element utilization.
Solution Approach 2:
The spiral flow members create continuous rotational motion throughout the fluid path, ensuring that fluid and contaminants continuously engage with the filter media along the entire element length. This continuous action prevents dead zones and ensures uniform contaminant distribution, maximizing the useful filtration action across the entire element.
3Device complexity
If axial flow directs contaminants to the upper region, then the filter structure remains simple, but contaminant-holding capacity decreases due to localized agglomeration
Solution Approach 1:
The spiral flow members create curved, rotating flow paths that distribute contaminants along the entire length of the filter media. By transforming the straight axial flow into a spiral path, contaminants are carried along the outer surface and distributed more uniformly, increasing the total contaminant-holding capacity of the element by utilizing the full length of the media rather than just the lower portion.
Solution Approach 2:
The patent introduces a rotational dimension to the flow pattern through spiral flow members. This additional circumferential motion component distributes contaminants not just axially but also circumferentially along the filter media, effectively increasing the volume of the element utilized for contaminant storage and improving overall contaminant-holding capacity.
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 improved filter element achieves a more even distribution of fluid and contaminants, increasing contaminant-holding capacity and reducing initial pressure drop, leading to extended element life and improved filtration performance without requiring significant system modifications.
Implementation Method 1
a ring of filtration media circumscribing a central axis
Implementation Method 2
causes fluid to flow helically or spirally across the outer surface of the end cap
Implementation Method 3
an annular sealing ring having an annular, peripheral resilient sealing portion
Data Source
AI summary
A filter element includes a ring of filtration media circumscribing a central axis, and first and second end caps. The first end cap includes i) an annular body portion defining a central opening around the central axis, sealingly bonded to the first end of the media ring, ii) an annular sealing ring having an annular, peripheral resilient sealing portion; and iii) axial support stanchions around the periphery of the body portion. The stanchions support the sealing ring at a location spaced apart from the body portion, and define radial flow openings between adjacent stanchions. One or more non-radial flow members extend from each stanchion along the outer surface of the annular body portion to direct flow in a spiral or helical manner, where the flow then passes through the flow openings and downwardly along the outer surface of the media in a swirling manner.