Shaped PTC Ceramic Heating Element for Difficult Access
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Solution Overview
Problem
Existing heating devices using PTC materials, such as disks or rectangular elements, are limited in their ability to achieve short heating times and low heating powers due to structural constraints, making it difficult to integrate them in regions where heat is needed, resulting in inefficient heating.
Innovation Solution
A heating device with a shaped body composed of ceramic materials of different compositions, which exhibit varying thermal and electrical properties, allowing for self-regulating heating and efficient heat distribution, enabling integration in structurally difficult-to-access areas with stepwise heating capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional PTC heating elements (disks or rectangular elements) are used, then the structure is simple and easy to manufacture, but they cannot be integrated in structurally difficult-to-access regions and cannot achieve short heating times
Solution Approach 1:
The heating element is segmented into multiple regions with different ceramic material compositions, each region providing different heating characteristics (fast heating, slow heating, different maximum temperatures). This segmentation allows the single heating element to adapt to complex structural environments and achieve short heating times in critical areas.
Solution Approach 2:
The heating element uses composite ceramic materials with different compositions (first ceramic material and second ceramic material) to create regions with distinct thermal and electrical properties. This composite approach enables the heating element to be integrated in difficult-to-access regions while achieving short heating times and low heating powers.
2Productivity
If high heating power is used to achieve short heating times, then heating efficiency improves, but energy consumption increases and temperature control becomes difficult
Solution Approach 1:
Different regions of the heating element have different ceramic material compositions tailored to their specific functions: fast heating regions use materials with higher heating rates, while slow heating regions use materials with lower heating rates. This local quality optimization achieves short heating times in critical areas without requiring high overall power consumption.
Solution Approach 2:
The ceramic materials have different Curie temperatures and resistance-temperature characteristics, allowing each region to self-regulate its temperature. This parameter variation enables precise temperature control and efficient energy usage, as each region operates at its optimal temperature point without excessive energy consumption.
3Productivity
If multiple heating elements are used to achieve different heating properties in different regions, then heating performance improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple heating elements with different properties are merged into a single integrated heating element with multiple regions. This consolidation maintains the heating efficiency benefits of having different heating characteristics in different areas while eliminating the manufacturing complexity of assembling and connecting multiple separate elements.
Solution Approach 2:
The single heating element performs multiple functions by incorporating different ceramic material regions, each optimized for specific heating requirements. This multi-functionality achieves the heating performance of multiple specialized elements while simplifying the overall device structure and manufacturing process.
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 device achieves efficient heating with short times and low powers by utilizing ceramic materials with different compositions, preventing further heating through resistance increase, eliminating the need for additional electronic regulation and allowing for precise temperature control.
Implementation Method 1
a ceramic material with a positive temperature coefficient of electrical resistance... If the temperature in the shaped body reaches a critical value, the resistance in the shaped body also rises, such that less current flows through the shaped body
Implementation Method 2
a shaped body which is heated by application of a voltage and can emit this heat to the surroundings
Data Source
AI summary
A heating device is provided, comprising a shaped body, which has at least two regions comprising different compositions of a ceramic material with a positive temperature coefficient of electrical resistance. A method for manufacturing a heating device is furthermore specified.