Single-Part Fuel Filter Housing for Water Separation

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Solution Overview

Problem

Existing fuel filters for internal combustion engines, particularly diesel engines, face challenges in efficiently removing water from fuels due to high sensitivity to water content, which can lead to particle erosion and corrosion, and current designs are costly and complex to manufacture, often requiring multiple parts and seals.

Innovation Solution

A filter design featuring a single-piece housing with a spacer that forms a liquid collection space, utilizing a support ring with webs and an eye for liquid channels, allowing for efficient water separation and discharge without the need for multiple parts, and incorporating a drain plug or valve for easy liquid outlet management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a two-part housing with separate filter medium and water collection space is used, then water separation function is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvewater separation functionVSAvoidhousing structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the filter medium housing and water collection space into a single integrated housing structure. The filter medium is arranged in the upper region while the water collection space is formed in the lower region of the same housing, eliminating the need for separate parts, threads, connecting devices, and seals between housing sections.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The housing is segmented into functional regions: an upper region for the filter medium and a lower region for water collection. This segmentation allows distinct functional zones within a single integrated structure, enabling water separation while maintaining manufacturing simplicity.

Inventive Principle:

Principle #1Segmentation

2Reliability

If a two-part housing with threads and seals is used, then water collection space is formed, but ease of manufacture deteriorates

Engineering Contradiction:

Improvewater collection capabilityVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges the housing and water collection space into a single molded part, eliminating threads, connecting devices, and seals that would be required in a two-part construction. This single-piece housing is directly manufacturable from injection molding or similar processes, significantly improving ease of manufacture.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If a one-part housing is used, then ease of manufacture is improved, but liquid discharge capability deteriorates

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidliquid discharge

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent extracts the liquid discharge function from the housing structure by providing a separate discharge opening in the housing floor. This allows the housing to remain as a simple one-piece structure while enabling easy liquid discharge through the dedicated opening, which can be sealed during operation and opened for drainage.

Inventive Principle:

Principle #2Taking out (Extraction)

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 enables cost-effective production and efficient water removal from fuels, simplifying the manufacturing process and ensuring reliable operation by allowing for a one-part housing and easy liquid discharge, thus addressing the sensitivity issues and manufacturing complexities of previous filters.

Implementation Method 1

Water droplets normally separate in the fuel filter along the fibers of the filter medium and aggregate to increasingly larger droplets because of their higher density compared to that of the fuel

Methodology Applied

Scientific EffectDensity gradient separation: Density Gradient

Implementation Method 2

The droplets flow down along the outside and partly along the inside of the filter pleats because of their higher density compared to that of the fuel. The water collects in a liquid collection space

Methodology Applied

Scientific EffectGravitational separation: Gravitation

Data Source

PatentUS8857628B2Filter for separating two liquids or liquid constituents from a gas

Publication Date: 2014.10.14 MANN HUMMEL GMBH

AI summary

A filter including a housing for receiving a filter medium and a filter medium received therein. In a lower region of the filter there is a discharge opening for discharging liquid from the filter. A spacer serves to form a collecting chamber for liquid and defines the liquid collecting chamber. The spacer is provided with webs which lead to an eye, and the eye has liquid channels.