Thermal Element Shielding Diffusion
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Solution Overview
Problem
Thermal elements used for high-temperature applications are susceptible to aging processes that lead to inaccurate temperature measurements and reduced response dynamics, particularly due to material diffusion through the shaft material affecting the conductors.
Innovation Solution
A thermal element design featuring conductors embedded in a shaft with a screening material that has a lower diffusion coefficient and higher thermal conductivity than the shaft material, protecting the contact point from external and internal diffusion and enhancing temperature distribution, thereby reducing aging effects and improving measurement accuracy and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thermal element uses a shaft material for protection, then the conductors are protected from external damage, but materials diffuse through the shaft material to the conductors causing aging and measurement drift
Solution Approach 1:
A screen made of screen material is introduced as an intermediary component between the shaft material and the contact point. This screen material has a lower diffusion coefficient than the shaft material, blocking the diffusion path of harmful materials while allowing thermal energy to reach the contact point. The screen thus mediates between the need for mechanical protection and the need to prevent material diffusion.
Solution Approach 2:
The thermal element employs a composite structure combining shaft material and screen material with different properties. The shaft material provides mechanical strength and basic protection, while the screen material layer (with lower diffusion coefficient and higher thermal conductivity) is strategically positioned to block material diffusion. This composite approach leverages the advantages of different materials to simultaneously achieve protection and prevent aging.
2Strength
If the shaft material is used to surround the conductors, then mechanical protection is provided, but the response dynamics of the thermal element deteriorate over time due to diffusion
Solution Approach 1:
The screen material acts as an intermediary that improves thermal energy transfer to the contact point while blocking material diffusion. Its higher thermal conductivity compared to the shaft material ensures that thermal energy reaches the contact point more efficiently, improving response dynamics without compromising the mechanical protection provided by the shaft structure.
Solution Approach 2:
The screen material is selectively applied in the region of the contact point where thermal energy needs to be efficiently transferred and where material diffusion must be blocked. This local enhancement of thermal conductivity and diffusion resistance precisely where needed improves response dynamics without requiring the entire shaft to be made of high-performance material.
3Stability of the object's composition
If conductors are embedded in shaft material, then mechanical stability is achieved, but aging processes cause continuous deterioration of measurement accuracy
Solution Approach 1:
The screen material serves as a protective intermediary between the shaft material and the contact point. It maintains the mechanical stability provided by the shaft embedding while simultaneously blocking the diffusion of harmful materials that would otherwise reach the conductors and cause aging. This allows the conductors to remain mechanically stable without suffering from material diffusion-induced degradation.
Solution Approach 2:
The harmful diffusion pathway is extracted or removed from the system by introducing the screen material. The screen creates a barrier that extracts the diffusion mechanism from the shaft-conductor interface, preventing material transport while maintaining the beneficial mechanical embedding structure.
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 thermal element provides reliable and consistent temperature measurements with enhanced response dynamics by shielding the contact point from diffusing materials, minimizing measurement drift and maintaining accurate temperature readings over time.
Implementation Method 1
The screen material has a lower coefficient of diffusion than the shaft material
Implementation Method 2
The screen material has a higher thermal conductivity than the shaft material
Data Source
AI summary
The invention relates to a thermal element comprising a shaft and a test prod arranged on one end of the shaft. The thermal element comprises a first conductor and a second conductor, which are manufactured from different conductor materials and which are in electrical contact on one contact point provided in the region of the test prod. The first conductor and the second conductor are embedded at least in sections in a material of the shaft. The contact point is additionally or alternatively to the shaft material shielded with respect to the outside space at least in sections by means of a shield formed by a shielding material, wherein the shielding material has a lower diffusion coefficient and/or a higher thermal conductivity than the shaft material.