Coriolis Flow Meter Bobbin Thermal Conductivity
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Solution Overview
Problem
Devices for measuring mass flow using the Coriolis principle face challenges in managing heat dissipation in magnet coils, leading to high temperatures, especially in high-power applications, which results in increased costs and reduced efficiency due to the use of metallic heat sinks and eddy currents.
Innovation Solution
The magnet coil's bobbin is made with materials having a specific thermal conductivity of at least 1 W/(K m), such as thermally conductive elastomers like thermally conductive polyphenylene sulfide or ceramics, eliminating the need for additional heat sinks and reducing eddy currents, thereby enhancing heat dissipation and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a metallic heat sink is used to dissipate heat from the magnet coil, then heat dissipation is improved, but device complexity and cost increase due to additional components and eddy current losses
Solution Approach 1:
The patent merges the heat dissipation function into the bobbin structure itself by incorporating thermally conductive material. The bobbin serves dual purposes: mechanical support for the coil winding and heat dissipation component. This eliminates the need for separate metallic heat sinks and cooling contraptions, reducing device complexity while maintaining effective heat dissipation.
Solution Approach 2:
The bobbin material itself provides the heat dissipation function without requiring external cooling systems. By using materials with high thermal conductivity (at least 1 W/(K m)), the bobbin autonomously conducts heat away from the coil winding to its surface where it can dissipate to the environment, making the system self-sufficient in thermal management.
2Temperature
If a metallic heat sink is used for heat dissipation, then heat dissipation capability is improved, but efficiency decreases due to eddy current formation
Solution Approach 1:
The patent replaces expensive metallic heat sinks with a cost-effective polymeric bobbin material that has sufficient thermal conductivity. While polymers generally have lower thermal conductivity than metals, the use of thermally conductive polymers (with conductivity of at least 1 W/(K m)) provides adequate heat dissipation without the parasitic eddy current losses that occur in metallic components, thereby improving overall system efficiency.
Solution Approach 2:
The invention uses composite or specially formulated polymeric materials that combine mechanical structural properties with enhanced thermal conductivity. These thermally conductive polymers (such as polyphenylene sulfide or other engineered composites) provide both the mechanical support function of the bobbin and the heat dissipation function, eliminating the need for metallic heat sinks and avoiding eddy current losses while maintaining structural integrity.
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 approach effectively manages heat dissipation without additional cooling contraptions, reducing costs and improving efficiency by using materials with high thermal conductivity, such as thermally conductive polyphenylene sulfide, which maintains mechanical integrity and ensures reliable heat dissipation up to 250°C.
Implementation Method 1
the bobbin of the magnet coil has a specific thermal conductivity of at least 1 W/(K m)
Implementation Method 2
If such a magnet coil is exposed to a current, it generates a magnetic field; this field results in a force being exerted on the magnet located within the magnet coil
Data Source
AI summary
A device for measuring the mass rate of flow which operates according to the Coriolis principle, with a measurement tube (1) and a magnet coil (7) of a bobbin (9) and a winding (10) attached to it for exciting and/or detecting vibrations of the measurement tube (1). The bobbin (9) of the magnet coil (7) has a specific thermal conductivity of at least 1 W/(K m). This enables the heat which forms in the magnet coil (7) to be efficiently dissipated to the surrounding vicinity without cooling elements, such as cooling fins, being necessary. In this way, the efficiency of the device for measuring the mass rate of flow using the Coriolis principle is altogether improved.