Filter Drain Plug Assembly to Prevent Fuel Backflow Contamination
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Solution Overview
Problem
Existing fuel and lube filter systems face challenges during installation, as dirty fluid can travel back to the fuel tanks when 100% of the fluid is drained from the housing, leading to improper filtration and potential contamination.
Innovation Solution
An automatic drain system with electronic sensors and a drain plug mechanism that automatically drains water from the fuel water separator filter system, ensuring proper installation and preventing dirty fluid from reaching the clean side by engaging the lid only when the drain plug is correctly positioned within the drain opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 100% of the fluid is drained from the housing, then water removal is improved, but dirty fluid can travel back to the fuel tanks causing contamination
Solution Approach 1:
The drain plug is positioned to close the drain opening before the filter element is fully installed, preventing dirty fluid from traveling back to the fuel tank. This preliminary action blocks the potential contamination path before the harmful effect can occur.
Solution Approach 2:
The drain plug automatically closes as the filter element is being installed, before the element is fully seated. This preliminary closing action ensures that when the element is fully installed, the drain opening is already sealed, preventing any backflow of dirty fluid to the fuel tank.
2Object-affected harmful factors
If the drain plug is positioned to prevent contamination, then fuel tank contamination is prevented, but the lid engagement may be interfered with
Solution Approach 1:
The drain plug is designed to move dynamically during installation. It protrudes from the filter element during installation to engage the drain opening and close it, then recedes or is positioned such that it no longer interferes with lid engagement once the filter element is fully installed.
Solution Approach 2:
The drain plug protrudes only far enough to engage the drain opening and close it, not so far as to permanently obstruct lid engagement. The protrusion distance is precisely controlled to provide just enough closure action without excessive interference with the lid mounting process.
3Extent of automation
If a drain plug protruding from the filter element is used, then automatic drain function is achieved, but improper installation can occur if the drain plug does not align with the drain opening
Solution Approach 1:
The drain plug and drain opening are positioned asymmetrically relative to the filter element and housing, creating a unique alignment geometry. This asymmetric positioning ensures that the drain plug can only properly align with the drain opening when the filter element is correctly oriented and installed, preventing improper installation.
Solution Approach 2:
The engagement between the drain plug and drain opening provides tactile and visual feedback during installation. When the filter element is properly installed, the drain plug naturally aligns and engages with the drain opening, providing confirmation of correct installation. Misalignment during installation provides immediate feedback that the element is not properly positioned.
Data Source
AI summary
A filtration system includes a housing and a filter element positioned within the housing. The housing includes a first housing end and a second housing end. A drain opening is defined in the second housing end. The filter element includes a first endplate and a second endplate defining an endplate opening. Filter media is positioned between and extending axially between the first endplate and the second endplate. The filter media defines a central opening extending axially therein. A drain plug axially protrudes from the second endplate in a direction away from the filter media. The drain plug is configured to engage the drain opening and facilitate installation of the filter element into the housing. A lid is configured to engage the first housing end. The engagement between the lid and the first housing end occurs when the drain plug is disposed within the drain opening.