Guide-Vane Cooled Engine Valve for High-Temperature Heat Transfer
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Solution Overview
Problem
Current sodium-cooled exhaust-gas valves for internal combustion engines require improved cooling characteristics, especially at high exhaust-gas temperatures, and existing designs do not effectively maximize heat transfer and reliability.
Innovation Solution
The design incorporates a valve with a cavity containing a coolant, such as sodium, and guide vanes that convert axial movement into rotational flow, enhancing heat transfer through enlarged inner surfaces and circulatory flow, with features like laser-welded lids, helical guide vanes, and relief grooves to manage stress and maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the coolant volume in the valve cavity is increased to improve cooling efficiency, then heat transfer capability is enhanced, but the valve structure becomes more complex and production cost increases
Solution Approach 1:
The patent introduces guide vanes that convert the simple up-and-down movement of coolant into a dynamic rotational flow pattern. This dynamic flow transformation enhances heat transfer efficiency without requiring increased coolant volume or complex valve structure modifications
Solution Approach 2:
The guide vanes utilize hydraulic principles to transform the linear motion of liquid sodium coolant into rotational motion, creating a swirling flow pattern that improves heat extraction from the valve disc and stem surfaces through enhanced fluid dynamics
2Temperature
If guide vanes are added to convert axial coolant movement into rotational flow to enhance heat transfer, then cooling performance is improved, but manufacturing complexity and production cost increase
Solution Approach 1:
The guide vanes are designed as separate, modular components that can be independently manufactured and then assembled into the valve cavity. This segmentation allows for simplified production processes, enabling the use of standard manufacturing techniques and reducing overall production complexity despite the added functional complexity
Solution Approach 2:
The guide vanes are positioned within the existing valve cavity structure, nesting the flow-control functionality within the already-manufactured valve body. This approach avoids the need to redesign the entire valve structure and allows guide vanes to be added as an internal component layer
3Power
If the valve operates at higher exhaust-gas temperatures to increase power output, then engine performance is improved, but valve reliability and service life decrease due to thermal stress
Solution Approach 1:
The guide vanes create a continuous rotational flow pattern that ensures constant coolant movement and sustained heat extraction throughout the valve operation cycle. This continuous cooling action maintains effective heat removal even under high-temperature operating conditions, preserving valve reliability during high-power output
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 achieves enhanced heat extraction and improved cooling efficiency, maintaining valve reliability even at high temperatures by maximizing heat transfer and reducing stress on joints, thus extending the valve's service life.
Implementation Method 1
The guide valve is arranged in such a manner in this case, that it converts an up and down movement of the coolant in an axial direction of the valve into a rotational movement around the axis of the valve
Implementation Method 2
The present invention is based on the one hand on an enlargement of the inner cavity surface and turbulence or the generation of a circulatory flow in the liquid coolant or sodium filling
Implementation Method 3
Internally cooled or sodium-cooled exhaust-gas valves have been known since 1935 at the latest. Sodium cooling and the effects thereof are well-known in the prior art
Data Source
AI summary
An internally cooled inlet or outlet valve for internal combustion engines, has a valve disc, a valve stem and a cavity inside the valve stem and the valve disc. A coolant is arranged in the cavity, wherein the cavity is provided with at least one guide vane for the coolant.