Nanofiber Polymer Heat Sink Composition for Cooler Circuit Breakers
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Solution Overview
Problem
Conventional electrical switching apparatus, such as circuit breakers and load centers, face challenges with elevated temperatures due to poor thermal conduction, as they are typically made from thermal insulating materials that are not effective at dissipating heat, while also requiring electrical resistive properties to prevent electrical conduction.
Innovation Solution
A composition combining a polymer component with nanofibers, where the nanofibers have higher thermal conductivity than the polymer, is used in an injection molding process to create an electrically resistive and thermally conductive apparatus, allowing for improved heat dissipation without compromising electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal insulating materials are used to make electrical switching apparatus, then electrical resistive properties are improved, but thermal conduction deteriorates
Solution Approach 1:
The patent applies composite materials by combining polymer matrix with thermally conductive filler particles (such as aluminum oxide, aluminum nitride, or boron nitride) to create a material that simultaneously provides electrical insulation and enhanced thermal conduction. The composite structure allows heat to travel through the filler particles while the polymer matrix maintains electrical resistivity, thus resolving the contradiction between electrical insulation and heat dissipation.
Solution Approach 2:
The patent implements local quality by creating regions with different thermal and electrical properties within the housing material. The thermally conductive filler is distributed throughout the polymer matrix to create pathways for heat transfer in specific directions, while maintaining overall electrical insulation. This allows optimized heat dissipation from critical areas (such as near terminals or switches) without compromising the electrical insulation properties of the bulk material.
2Temperature
If thermally conductive materials are used to improve heat dissipation, then thermal conduction is improved, but electrical resistive properties deteriorate
Solution Approach 1:
The patent resolves this contradiction by using composite materials where thermally conductive filler particles (aluminum oxide, aluminum nitride, boron nitride) are dispersed in an electrically insulating polymer matrix. The filler particles provide thermal conduction pathways while the polymer matrix maintains electrical insulation, allowing simultaneous achievement of both thermal conduction and electrical resistivity that neither material could provide alone.
Solution Approach 2:
The polymer matrix acts as an intermediary between the thermally conductive filler particles, enabling heat transfer through the filler while blocking electrical conduction. The matrix mediates the interaction between thermal and electrical requirements, allowing the filler to conduct heat without compromising the electrical insulation properties of the overall material 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 use of nanofibers in the composition enhances thermal conductivity, reducing internal temperatures and enabling effective heat dissipation in electrical switching apparatus, while maintaining electrical resistive properties to ensure safety.
Implementation Method 1
the nanofibers have higher thermal conductivity than the polymer, is used in an injection molding process to create an electrically resistive and thermally conductive apparatus, allowing for improved heat dissipation
Implementation Method 2
The material of construction for the housing can be selected from a variety of known materials which may molded in various geometries... the molded plastic used in an electrical switching apparatus, e.g., circuit breaker or load center is electrically resistive
Data Source
AI summary
The disclosed concept relates to compositions and methods for the manufacture of electrically resistive, thermally conductive electrical switching apparatus. The composition includes a polymer component and a nanofiber component. The thermal conductivity of the nanofiber component is higher than the thermal conductivity of the polymer component such that the electrical switching apparatus which includes the composition of the disclosed concept has improved heat dissipation as compared to an electrical switching apparatus constructed of the polymer component in the absence of the nanofiber component. Further, the disclosed concept relates to methods of lowering the internal temperature of an electrically resistive, thermally conductive electrical switching apparatus by forming the internals of the apparatus, e.g., circuit breakers, and/or the enclosure from the composition of the disclosed concept.