Three-Way Heating Shell With In-Situ Circuits for Freeze Protection
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Solution Overview
Problem
Existing fluid circuits in motor vehicles, such as those used in internal combustion engines and SCR systems, face issues with freezing fluids leading to blockages and potential engine damage due to inadequate heating solutions, particularly in cold weather.
Innovation Solution
A heating shell with integrated resistive heating circuits formed on semi-cylindrical surfaces of a T or Y-shaped connector, allowing for direct heating within the shell rather than within the fluid connection, providing thermal insulation and mechanical protection, and manufactured using techniques like selective metallization and dielectric coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating means are integrated into the fluid connection device, then the heating function is provided, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The heating circuits are integrated directly into the shell structure itself, merging the heating function with the protective shell. The shell serves dual purposes: mechanical protection and thermal heating, eliminating the need for separate heating components attached to the fluid connection device.
Solution Approach 2:
The heating circuits are formed as thin resistive tracks (width ≤ 5mm, thickness ≤ 0.5mm) on the semi-cylindrical surfaces of the shell. These thin-film heating elements are embedded within or on the shell surface, providing heating functionality while maintaining the shell's structural integrity and minimizing added complexity.
2Temperature
If resistive heating circuits are formed on semi-cylindrical surfaces, then heating efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The heating circuits are localized to specific semi-cylindrical surfaces of the shell, with each half-shell containing heating circuits on its outer semi-cylindrical surface. This localized approach allows for optimized heat distribution in critical areas while simplifying the overall manufacturing process by focusing precision requirements on specific regions rather than the entire structure.
3Strength
If the shell provides both mechanical protection and thermal insulation, then the protection function is improved, but the device complexity increases
Solution Approach 1:
The shell is designed to perform multiple functions simultaneously: mechanical protection of the fluid connection device, thermal insulation to maintain fluid temperature, and as the substrate for integrated heating circuits. This multi-functional design eliminates the need for separate protective housing and insulation layers, reducing overall device complexity while enhancing protection capabilities.
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 effectively prevents fluid freezing by providing thermal power between 0.5 and 10W, ensuring the proper functioning of fluid circuits without requiring significant modifications to existing systems and offering both thermal insulation and mechanical protection.
Implementation Method 1
the shell comprising resistive heating circuits which are formed in situ on said semi-cylindrical surfaces
Data Source
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AI summary
Three-way heating shell, in particular for a motor vehicle fluid circuit, said shell being generally T-shaped or Y-shaped and comprising an inner passage having the same shape, in which passage a three-way fluid connection is intended to be housed, the shell being formed by two half-shells (10a) having the same shape which are attached to one another and together define the passage, the half-shells comprising semi-cylindrical surfaces (22, 24, 26) forming portions of the passage, the heating shell being characterised in that it comprises resistive heating circuits (28a, 28b) which are formed in situ on the semi-cylindrical surfaces.