Fuel Filter Water Separation via Deflection and Nesting
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Solution Overview
Problem
Existing fuel filters are limited in their ability to separate water from diesel fuel due to emulsified water passing through the filter and being sucked into the engine, resulting in incomplete separation.
Innovation Solution
A fuel filter design that incorporates a housing insert with a sharp directional change to separate water from fuel, a sleeve-shaped screen fabric element, and a system for pumping out water, including a level sensor and heating device to prevent freezing and ensure efficient separation and removal of water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter element is used, then particle filtration is achieved, but water separation is incomplete as emulsified water passes through with the fuel
Solution Approach 1:
The filter is divided into distinct functional zones: a first region with a filter element for particle filtration, a second region with a screen mesh element for water separation, and a deflection device with sharp edges to separate emulsified water. This segmentation allows each component to specialize in one aspect of separation, improving overall water removal efficiency without requiring a complete redesign of the filter structure.
Solution Approach 2:
A deflection device with sharp edges is introduced as an intermediary element between the filter element and screen mesh. This deflection device creates a sharp change in flow direction, causing emulsified water to separate from fuel through centrifugal and tangential forces before reaching the screen mesh, thereby enhancing water separation without adding complex mechanical components.
2Reliability
If the screen mesh element is positioned close to the filter element, then water separation efficiency increases, but the housing space requirements increase
Solution Approach 1:
The screen mesh element is positioned concentrically around the deflection device, creating a nested arrangement where the screen mesh forms an annular chamber. This nested configuration maximizes the use of available radial space within the filter housing, allowing efficient water separation without increasing the overall filter diameter or length.
Solution Approach 2:
The filter design transitions from a single-plane filtration approach to a multi-dimensional arrangement with radial flow paths. The annular chamber created by the concentric screen mesh allows water to be separated and collected in a downward direction, utilizing vertical space efficiently while maintaining compact horizontal dimensions.
3Productivity
If manual water removal is used, then device complexity is minimized, but water removal frequency and engine protection are insufficient
Solution Approach 1:
The filter system incorporates a pump that automatically activates when water accumulates in the collection chamber, eliminating the need for manual intervention. The pump draws water through a non-return valve back to the inlet, creating a self-service system that continuously protects the engine from water contamination without requiring user attention or complex control mechanisms.
Solution Approach 2:
A level sensor is integrated into the collection chamber to detect water accumulation and provide feedback to the control unit. When the water level reaches a predetermined threshold, the sensor triggers the pump to activate, creating a feedback-controlled system that maintains optimal water separation and removal automatically, balancing productivity improvement with acceptable device complexity.
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 effectively separates water from diesel fuel, ensuring that only a small amount of emulsified water reaches the engine, with the water being collected and removed efficiently, and the system prevents fuel from being pumped out, maintaining engine performance and reducing the risk of freezing.
Implementation Method 1
the water component continuing its downward movement due to its greater density
Implementation Method 2
the device for deflecting the fuel between the filter element and the screen mesh element largely separates the components with greater mass tangentially or centrifugally due to the sharp change in direction
Implementation Method 3
The water that is then still emulsified in the fuel hits the filter mesh element with the fuel and water beads are formed there
Implementation Method 4
a pump that can be switched on as required and a non-return valve downstream of this in the flow direction are arranged in the container
Implementation Method 5
In order to prevent the separated water from freezing at low ambient temperatures and thus enable the water to be pumped out, a heating device is preferably assigned to the pump
Implementation Method 6
the container is provided with an outlet, which is followed by a collecting space containing a substance that stores a liquid. This measure means that components contained in the water, such as hydrocarbons, are absorbed by the substance, with the water evaporating over time
Implementation Method 7
the evaporated water can escape through the wall and be collected there. The evaporated water condenses on the wall of the collection container and is collected at its bottom
Data Source
AI summary
The invention relates to a fuel filter (1) comprising a device for separating water from the fuel. This device comprises at least one wire gauze element (6), which is disposed in a filter housing (2) and is provided downstream of a filter element (3) for the particle filtration of the fuel, a receptacle (15) that is disposed under the wire gauze element (6) on the filter housing (2), wherein the precipitated water drops collect in the receptacle, and a device for diverting the fuel between the filter element (3) and the wire gauze element (6).