Sodium-Cooled Engine Valve With Getter for Pressure-Stable Cooling
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Solution Overview
Problem
Internal combustion engine valves face challenges with thermal and chemical stability due to exposure to high temperatures and aggressive environments, which affect their strength and cooling efficiency.
Innovation Solution
Incorporating a non-evaporable getter in the hollow space of the valve to bind foreign constituents like hydrocarbons and gases, enhancing cooling efficiency and reducing internal pressure, thereby improving the valve's strength and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If sodium is introduced into the hollow space for cooling, then cooling efficiency is improved, but internal pressure increases and foreign constituents reduce cooling performance
Solution Approach 1:
The patent extracts and removes foreign constituents (hydrocarbons, oils, greases) from the hollow space containing sodium by introducing a getter material. This extraction process eliminates the harmful substances that were increasing internal pressure and reducing cooling efficiency, while preserving the beneficial sodium cooling effect.
Solution Approach 2:
The getter material serves as an intermediary substance that selectively binds foreign constituents in the hollow space. This mediator absorbs hydrocarbons and other contaminants through sorption, thereby reducing internal pressure and preventing interference with sodium cooling, while the sodium continues to perform its cooling function uninterrupted.
2Quantity of substance
If foreign constituents are present in the hollow space, then internal pressure increases, but cooling efficiency is reduced
Solution Approach 1:
The patent converts the harmful presence of foreign constituents into a beneficial outcome by using the getter material to selectively bind these substances. The getter transforms the harmful hydrocarbons and contaminants into bound states, converting them from harmful pressure-increasing substances into stable, non-interfering compounds, thereby improving cooling efficiency while managing internal pressure.
3Temperature
If the valve operates at high temperatures, then thermal stability is required, but component strength decreases
Solution Approach 1:
The patent creates an inert environment within the hollow space by using the getter material to bind reactive foreign constituents. This inert atmosphere prevents chemical reactions between foreign substances and the valve materials, protecting the component strength while allowing operation at high temperatures. The getter maintains a chemically stable environment that preserves material properties under thermal stress.
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 getter effectively binds foreign constituents, reducing internal pressure and enhancing cooling, leading to improved heat transfer and increased component strength, allowing the valve to operate at higher temperatures with enhanced reliability.
Implementation Method 1
The getter binds, in particular by means of sorption, foreign constituents present in the hollow space which differ from sodium
Implementation Method 2
sodium for cooling received therein
Data Source
AI summary
A valve for an internal combustion engine and a method for producing such a valve is disclosed. The valve includes a valve bottom and a valve stem projecting from the valve bottom. An interior of the valve delimits a hollow space, in which sodium for cooling is received. In the hollow space, a non-evaporable getter is arranged.