Dual-Component Fuel Injector Seal Combining Strength and Heat Transfer
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Solution Overview
Problem
Fuel injector seals in internal combustion engines face inefficiencies in heat transfer from the nozzle housing and often lack sufficient strength to resist yielding, leading to potential leaks and combustion gas leakage.
Innovation Solution
A dual-component injector seal assembly is introduced, comprising a sealing ring made of a strong material like stainless steel for structural integrity and a thermally conductive heat transfer sleeve made of a higher thermal conductivity material like copper, positioned between the nozzle element housing and the sealing ring to efficiently transfer heat away from the nozzle housing while maintaining structural integrity under clamp loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal component is used to keep combustion gases from flowing into the passage surrounding the fuel injector, then sealing effectiveness is improved, but heat transfer efficiency deteriorates
Solution Approach 1:
The seal assembly is divided into two distinct components: a seal component for combustion gas sealing and a thermally conductive component for heat transfer. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The thermally conductive component acts as an intermediary between the nozzle element housing and the seal component, facilitating heat transfer from the nozzle housing to the seal component while maintaining sealing integrity.
2Temperature
If a seal component is used to transfer heat away from the nozzle element housing, then heat transfer efficiency is improved, but structural strength deteriorates
Solution Approach 1:
The functions of heat transfer and structural support are separated into different components. The thermally conductive component handles heat transfer while the seal component provides structural strength to resist clamp loads.
Solution Approach 2:
The seal assembly uses composite construction with different materials optimized for specific properties: the thermally conductive component uses material with high thermal conductivity for heat transfer, while the seal component uses material with high strength for structural support.
3Strength
If a single-material seal component is used to receive clamp loads, then structural integrity is maintained, but heat transfer capability deteriorates
Solution Approach 1:
The single-material seal component is replaced with a two-component assembly where the thermally conductive component is specifically designed to transfer heat from the nozzle element housing to the seal component, while the seal component maintains structural integrity.
Solution Approach 2:
Different regions of the seal assembly have different material properties optimized for local requirements: the thermally conductive component has high thermal conductivity for heat transfer zones, while the seal component has high strength for load-bearing zones.
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 combines combustion sealing with enhanced heat transfer, reducing nozzle tip temperatures and preventing fuel degradation, thereby improving the reliability and performance of the fuel injector by maintaining structural integrity and preventing leaks.
Implementation Method 1
a thermally conductive component formed of a second material different than the first material, the second material having a higher thermal conductivity than the first material, and the thermally conductive component positioned radially between the nozzle element housing and the seal component to transfer heat from the nozzle element housing to the seal component
Data Source
AI summary
This disclosure provides a fuel injector seal assembly comprising a seal component fabricated or formed of a first material and a thermally conductive or heat transfer component fabricated or formed of a second material that is different from the first material. The first material has a greater strength than the second material, and the second material has a greater thermal conductivity than the first material. Thus, the injector seal assembly is able to provide a primary benefit of a combustion seal while also providing an enhanced benefit of transferring heat from one portion of the fuel injector to another portion of the fuel injector.