Fuel Filter Return Tube for Automatic Water Drainage
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Solution Overview
Problem
Conventional fuel systems with filter water separators face issues with water accumulation in the center tube of fuel filter assemblies, leading to structural weaknesses and damage when water is carried into the fuel system, as existing solutions like drain valves and WIF sensors are cumbersome and often not used due to accessibility issues and incomplete drainage.
Innovation Solution
A fuel filter assembly with a return tube that extends into the central region of the filter media, collecting and draining immiscible liquids like water from the bottom inner region, eliminating the need for high-pressure side drain valves and WIF sensors, and integrating with a liquid drain line for automatic water removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drain valve and WIF sensor are installed on the high pressure side to drain water, then water can be drained from the sump, but the system introduces structural weaknesses and requires manual intervention that is difficult to access
Solution Approach 1:
The return tube extracts the drainage function from the complex drain valve and WIF sensor assembly, creating a simple tubular structure that performs water removal without requiring additional control mechanisms or manual access points
Solution Approach 2:
The return tube enables automatic water drainage through the fuel filter assembly without requiring manual intervention. The tube's positioning allows water to be continuously removed as it accumulates, making the system self-regulating for water separation
2Reliability
If a drain tube extends through the filter cartridge to drain water from the sump, then water can be drained from outside the filter, but water inside the center tube still accumulates
Solution Approach 1:
The return tube extends into the central region of the filter media, accessing the three-dimensional space inside the filter cartridge where water accumulates. This internal positioning allows drainage from previously inaccessible interior regions rather than only from the external sump
3Reliability
If the return tube extends into the central region of the filter media, then water can be collected from the bottom inner region, but the tube structure adds complexity to the filter assembly
Solution Approach 1:
The return tube serves multiple functions: it acts as a structural support element within the filter assembly, provides a drainage pathway for water collection, and maintains the integrity of the filter media while enabling water removal from the bottom inner region
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 return tube effectively prevents water from entering the high-pressure pumps and fuel injectors, simplifies the fuel system design, reduces costs by minimizing seals, and ensures continuous, automatic drainage without manual intervention, protecting the fuel system from water damage.
Implementation Method 1
water is coalesced into and accumulates within a center tube of a conventional fuel filter assembly
Data Source
AI summary
A fuel filter assembly for filtering a fuel-liquid mixture comprises a filter cartridge and a return tube. The filter cartridge comprises a filter media and a housing. The filter media defines an open central region therein. The housing contains the filter media. The return tube extends into the central region of the filter media. The return tube collects and drains liquid from a bottom inner region of the filter media.