Grooved Injector Nozzle Combustion Shield for Corrosion Prevention
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Solution Overview
Problem
Fuel injector tips in internal combustion engines can reach excessively high temperatures, leading to mechanical failure and deposit formation due to fuel coking, and existing nozzle combustion shields may cause corrosion at the nozzle shoulder, resulting in failure.
Innovation Solution
An injector seal assembly featuring a thermally conductive component with grooves to facilitate fluid communication between the combustion chamber and the gap between the fuel injector and the seal assembly, preventing corrosion and effectively transferring heat from the fuel injector nozzle to the engine cylinder head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a nozzle combustion shield is used to transfer heat from the fuel injector tip to the cylinder head, then the temperature of the fuel injector tip is reduced, but corrosion occurs at the nozzle shoulder resulting in potential failure
Solution Approach 1:
The combustion chamber is divided into two zones by the groove: a main combustion chamber and a secondary chamber. This segmentation allows hot combustion gases to be directed through the groove to specific areas needing thermal management while isolating other areas from corrosive conditions.
Solution Approach 2:
The groove acts as an intermediary channel that mediates between the hot combustion gases and the nozzle shoulder area. It allows controlled thermal exposure to prevent corrosion without compromising the heat transfer function of the combustion shield.
2Loss of energy
If the thermally conductive component is tightly coupled to the seal component to improve heat transfer, then heat transfer efficiency increases, but corrosion may occur at the interface
Solution Approach 1:
The interface between the thermally conductive component and seal component is segmented by the groove, creating distinct zones that allow both effective thermal contact and protective gas flow paths to coexist.
Solution Approach 2:
Combustion gases are used as a fluid medium to flow through the groove, providing both thermal management and protective atmosphere at the interface between the thermally conductive component and seal component.
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 manages the temperature of the fuel injector nozzle, preventing mechanical failure and deposit formation, while also preventing corrosion, thus enhancing the reliability and longevity of the fuel injector.
Implementation Method 1
the thermally conductive component... configured to transfer head from the nozzle housing to the seal component
Implementation Method 2
defining at least one groove to allow fluid communication between the main combustion chamber and a gap defined by a fuel injector and the injector seal assembly
Data Source
AI summary
An injector seal assembly including a nozzle combustion shield is disclosed, the thermally conductive component of the injector seal assembly defining at least one groove to allow fluid communication between the main combustion chamber and a gap defined by a fuel injector and the injector seal assembly to facilitate the prevention of corrosion of the components.