Diesel Injector Check Valve Sludge Flushing

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Solution Overview

Problem

The formation of sludge in the region around the fuel inlet check valve of diesel engines using carbonaceous aqueous slurry fuels leads to blockages, unreliable valve seating, and reduced engine performance, as well as increased emissions and wear, due to the settling and destabilization of carbonaceous particulates.

Innovation Solution

A fuel injection arrangement that exposes the check valve outlet region to a pressurized fuel flow, eliminating stagnant areas and reducing sludge formation by integrating the check valve within the injection path wall, ensuring regular flushing and minimizing the risk of blockages between the pump and nozzle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the check valve is isolated from the pressurized fuel flow path, then the fuel pump is protected from sludge formation, but the check valve outlet region becomes stagnant and prone to sludge accumulation and blockages

Engineering Contradiction:

Improvefuel pump reliabilityVSAvoidsludge formation at check valve

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary arrangement where the check valve outlet region is exposed to the pressurized fuel flow path without directly connecting the check valve to the pump. This allows the fuel flow to flush out sludge from the check valve outlet region while the pump remains protected from direct exposure to slurry fuel contaminants.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The fuel system is segmented into distinct zones: the pump chamber housing, the injection path, and the check valve region. This segmentation allows different parts of the system to have different exposure levels to slurry fuel, with the pump protected and the check valve outlet region exposed to flushing flow.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If carbonaceous aqueous slurry fuels are used to reduce fuel cost, then fuel abundance and low cost are achieved, but sludge formation and settling occur in the fuel system

Engineering Contradiction:

Improvefuel type flexibilityVSAvoidsludge formation

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful settling tendency of carbonaceous particles into a beneficial flushing mechanism. By exposing the check valve outlet region to the pressurized fuel flow, the natural movement of slurry fuel serves to prevent sludge accumulation rather than cause it, turning the potential harm into a cleaning mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If the check valve outlet region is exposed to pressurized fuel flow, then sludge formation is reduced and blockages prevented, but the check valve must be integrated within the injection path wall

Engineering Contradiction:

Improvefuel injection reliabilityVSAvoidcheck valve integration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The check valve is merged with the injection path wall structure, integrating the valve housing into the existing fuel pathway. This integration allows the check valve outlet region to be naturally exposed to the pressurized fuel flow without requiring additional complex external components or separate flushing systems.

Inventive Principle:

Principle #5Merging (Combining)

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 configuration reduces sludge formation and associated blockages, enhancing the reliability and consistency of fuel injection, allowing for the use of higher viscosity and lower quality slurry fuels, and improving engine performance and emissions.

Implementation Method 1

exposes the outlet region to the pressurised fuel flow to facilitate flushing of the outlet region during fuel flow between the pumping element and the injector nozzle

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS10995719B2Injector arrangement for diesel engines using slurry or emulsion fuels

Publication Date: 2021.05.04 COMMONWEALTH SCI & IND RES ORG

AI summary

The present invention relates to a fuel injection arrangement for a diesel type engine configured to use carbonaceous aqueous slurry fuels. The fuel injection arrangement includes an injector nozzle for injecting fuel into a combustion chamber; a pump chamber housing a fuel pumping element for generating a pressurised fuel flow to the injector nozzle along an injection path between the pumping element and the injector nozzle; and a check valve connected to a fuel supply for regulating and supplying fuel to the injection path via a check valve outlet. A region immediately downstream of the check valve outlet defines an outlet region and the check valve is arranged to expose the outlet region to the pressurised fuel flow to facilitate flushing of the outlet region during fuel flow between the pumping element and the injector nozzle.