Fuel Filter Inversion for Water Separation

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Solution Overview

Problem

Existing fuel filters for diesel engines face difficulties in separating water droplets from fuel due to the flow direction, which complicates maintenance and can lead to pollution and inefficient filtration.

Innovation Solution

The raw fuel inlet is positioned in the housing base, allowing a flow direction from top to bottom on the filter insert's circumference, enhancing water droplet separation and deposit in a lower area, with a support body featuring three flow channels for efficient integration and venting, and a water collection chamber to prevent contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the raw fuel inlet is arranged at the bottom or lower end wall of the filter housing, then maintenance from the top is enabled, but water droplet separation is impaired

Engineering Contradiction:

Improvemaintenance accessibilityVSAvoidwater droplet separation efficiency

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional flow direction by arranging the raw fuel inlet in the housing base and directing fuel flow from top to bottom through the filter insert. This inversion enables water droplets to separate and deposit in the lower area during filtration, while still allowing maintenance access from the top through the removable housing cover.

Inventive Principle:

Principle #13The other way round (Inversion)

2Device complexity

If the fuel flows from bottom to top at the outer circumference of the filter insert, then the filtration structure is simplified, but water droplet separation and deposit are hindered

Engineering Contradiction:

Improvefiltration structure complexityVSAvoidwater droplet separation

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent reverses the conventional bottom-to-top flow direction to a top-to-bottom flow direction. This inversion allows water droplets to settle and deposit in the lower area of the filter housing during the filtration process, improving water separation efficiency while maintaining a relatively simple filtration structure.

Inventive Principle:

Principle #13The other way round (Inversion)

3Adaptability or versatility

If the support body is designed in two parts with separate filter insert and housing, then assembly flexibility is improved, but the risk of residual fuel and pollution increases

Engineering Contradiction:

Improveassembly flexibilityVSAvoidresidual fuel and pollution

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the support body into a radially outer part forming the filter insert and a radially inner part forming the housing, allowing independent assembly and maintenance. The removable housing cover enables complete discharge of residual fuel from the filter housing during maintenance, preventing pollution while maintaining assembly flexibility.

Inventive Principle:

Principle #1Segmentation

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

This design improves water droplet separation and maintenance accessibility, ensuring effective filtration and reducing the risk of pollution by allowing complete venting and easy removal of the filter insert without residual fuel.

Implementation Method 1

a replaceable ring filter insert being arranged in the filter housing through which the fuel can flow radially from the outside to the inside, said ring filter insert subdividing an interior of the filter housing into a raw area and a pure area

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

a second flow channel being connected, on the one hand, with the raw area via a vent throttle or a vent valve and, on the other hand, with a tank return in the filter housing

Methodology Applied

Scientific EffectVenting: Valve

Implementation Method 3

a fuel flow direction from top to bottom results on the outer circumference of the filter insert which encourages the separation and deposit of water droplets from the fuel in a lower area of the filter housing

Methodology Applied

Scientific EffectGravitational separation: Gravitation

Data Source

PatentUS9011685B2Fuel filter of an internal combustion engine

Publication Date: 2015.04.21 HENGST WALTER

AI summary

A fuel filter of an internal combustion engine including a filter housing having a lowermost housing base and a topmost removable housing lid. The filter housing has one raw fuel inlet and one pure fuel outlet. A replaceable annular filter insert mounts there in the filter housing, fuel flowing through it from outside towards inside. The filter subdivides an interior space of the filter housing into a raw zone and a pure zone. A supporting body is arranged in the interior of the annular filter insert, a first flow channel and a second flow channel extending therethrough. The first flow channel connects at one end to the pure zone and at the other end to the pure fuel outlet. The second flow channel connects at one end to the raw zone via a vent throttle or a vent valve and at the other end to a reservoir return in the filter housing. The raw fuel inlet is in the housing base and a flow channel leads from the raw fuel inlet to a portion of the raw zone of the interior space of the filter housing which is, during operation, topmost.