Eutectic Thermal Sensor With Fiber-Wrapped Insulation
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Solution Overview
Problem
Current continuous thermal sensing elements with tubular or crushed ceramic insulators exhibit inconsistent and transient performance due to handling and installation challenges.
Innovation Solution
A continuous thermal sensing element featuring an electrically conductive core coated with a eutectic material and wrapped with an insulating fiber layer, which provides improved thermal response characteristics and isolation, formed using a fiber wrapping apparatus to create a spiral-shaped insulating fiber layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tubular or crushed ceramic insulators are used to isolate the center conductor, then electrical isolation is achieved, but the sensing element exhibits inconsistent and transient performance during handling and installation
Solution Approach 1:
The patent changes the physical state and form of the insulating material from rigid ceramic pieces to flexible fiber strands. This parameter change allows the insulating layer to deform and adapt during handling and installation, eliminating the inconsistent performance caused by rigid ceramic insulators while maintaining electrical isolation between the center conductor and outer sheath.
Solution Approach 2:
The patent creates a composite insulating structure by combining insulating fibers with a binding agent to form a cohesive insulating layer. This composite material approach provides both the electrical isolation properties of ceramic materials and the flexibility of fibrous structures, resolving the contradiction between isolation effectiveness and handling reliability.
2Reliability
If ceramic insulators are used to provide electrical isolation, then insulation is achieved, but the insulating performance varies transiently during processing
Solution Approach 1:
The patent transforms the insulator from a rigid ceramic structure to a flexible fiber-based composite, changing its mechanical parameters while maintaining electrical properties. This allows the insulator to maintain structural consistency during handling without the transient performance variations associated with rigid ceramic pieces that can shift or fracture.
Solution Approach 2:
The patent divides the insulating material into individual fiber strands that are wrapped around the center conductor. This segmentation allows the insulating layer to conform to the conductor's shape and maintain consistent electrical isolation, as the flexible fibers can be evenly distributed and secured along the entire length of the conductor.
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 solution enhances the consistency and sensitivity of thermal sensing by stabilizing the insulating performance and time constant of the sensing element, reducing variability and improving handling and installation reliability.
Implementation Method 1
The core is coated with a eutectic material formulated to provide desirable thermal response characteristics
Implementation Method 2
The insulating fiber layer includes a strand that extends along the length of the electrically conductive core
Data Source
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AI summary
A eutectic sensing element (110) includes an electrically conductive core (106) extending along a first axis to define a length. The core (106) is coated with a coated with a eutectic material formulated to provide desirable thermal response characteristics. The eutectic sensing element (110) further includes an insulating fiber layer (114) disposed on an external surface of the electrically conductive core (106). The insulating fiber layer (114) includes a strand that extends along the length of the electrically conductive core (106).