Measuring Insert Coupling for Faster, Vibration-Stable Temperature Sensing
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Solution Overview
Problem
Existing temperature sensors in thermowells face challenges with mechanical stability, sensitivity to vibrations, and slow response times due to air gaps and inadequate thermal coupling between the measuring insert and protective tube, affecting measurement accuracy and reliability.
Innovation Solution
The coupling element is introduced to improve the coupling between the measuring insert and the protective tube, comprising a coupling element comprising a coupling mechanism that reduces the sensitivity to mechanical vibrations and thermal coupling by using a coupling element that decreases the sensitivity of the coupling element to mechanical vibrations and thermal coupling by employing a coupling mechanism that enhances the coupling element to thermal vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring insert is inserted into the protective tube without a coupling element, then the installation is simple, but air gaps form between the measuring insert and protective tube leading to increased response time and reduced measurement accuracy
Solution Approach 1:
A coupling element is introduced as an intermediary component between the measuring insert and protective tube. This coupling element fills air gaps and improves thermal contact, thereby enhancing measurement accuracy without requiring fundamental changes to the measuring insert structure.
Solution Approach 2:
The coupling element is made from composite materials that combine high thermal conductivity with elastic properties. This allows the material to simultaneously improve heat transfer between the measuring insert and protective tube while accommodating dimensional variations and maintaining continuous contact.
2Loss of time
If the walls of the protective tube are made as small as possible to reduce response time, then the thermal mass is reduced, but the mechanical strength and stability of the protective tube deteriorates
Solution Approach 1:
The system is segmented into distinct functional components: the protective tube maintains its mechanical strength with adequate wall thickness, while the coupling element and measuring insert assembly handles the thermal measurement function. This segmentation allows each component to be optimized for its primary function without compromise.
Solution Approach 2:
The coupling element acts as a thermal intermediary that bridges the measuring insert and protective tube. It provides a low-thermal-mass pathway for heat transfer, enabling fast response times while the protective tube maintains its structural integrity with sufficient wall thickness.
3Measurement precision
If additional spring elements are used to improve contact between protection tube and measuring insert, then thermal contact is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The coupling element integrates multiple functions into a single component: it provides elastic contact pressure, fills air gaps, conducts heat, and accommodates dimensional variations. This merging eliminates the need for separate spring elements and simplifies the manufacturing process while maintaining improved thermal contact.
Solution Approach 2:
The coupling element uses composite materials that inherently provide both elastic properties for maintaining contact pressure and high thermal conductivity for heat transfer. This material selection achieves the thermal contact improvement without requiring additional mechanical components like spring elements.
4Stability of the object's composition
If the measuring insert is fixed rigidly inside the protective tube, then mechanical stability is improved, but sensitivity to vibrations increases and thermal expansion is restricted
Solution Approach 1:
The coupling element employs flexible material properties to provide a compliant connection between the measuring insert and protective tube. This flexibility allows the system to absorb mechanical vibrations and accommodate thermal expansion without creating rigid constraints that would increase vibration sensitivity or restrict thermal movement.
Solution Approach 2:
The coupling element provides dynamic mechanical characteristics that adapt to varying conditions. It maintains stable thermal contact while allowing controlled movement in response to vibrations and thermal expansion, thereby achieving mechanical stability without rigid fixation that would amplify vibrations.
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 coupling element enhances mechanical stability, reduces sensitivity to vibrations, and improves thermal conductivity, leading to faster response times and enhanced measurement accuracy.
Implementation Method 1
The coupling element is at least partially composed of a thermally conductive material
Implementation Method 2
the first component being at least partially rigid and the second component being at least partially elastic
Implementation Method 3
DE102013114140A1 or DE102014101968A1, e.g., describe the use of additional spring elements to improve the contact between the protection tube and the measuring insert
Data Source
AI summary
The present disclosure relates to a measuring insert for insertion into a protective tube for determining and/or monitoring a temperature of a medium in a vessel or pipe, which protective tube at least partially protrudes into an inner volume of the vessel or pipe, the measuring insert including: an elongated tube; a temperature sensor arranged inside an end region of the measuring insert; and a coupling element connected to the elongated tube in the end region in which the temperature sensor is arranged, which coupling element is embodied and/or dimensioned so as to serve for fixing the measuring insert inside the protective tube in a state in which the measuring insert is introduced into the protective tube.