Furnace Heating Elements for Uniform Temperature
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Solution Overview
Problem
Existing furnaces face challenges in achieving a uniform temperature field within the sample space due to varying distances between the sample and heating elements, leading to non-homogeneous temperature conditions and poor accessibility for sample loading.
Innovation Solution
The furnace design features flat heating elements on the side facing the sample carrier, extending horizontally beyond the sample, with a sample chamber having a height several times smaller than its diameter, and is divided into upper and lower parts for easy access and thermal insulation, allowing for uniform temperature distribution and improved accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If heating elements are arranged in the side walls of the sample space extending over considerable height, then the furnace structure is simple, but the temperature field uniformity in the sample area deteriorates and the distance between sample surface and heating element varies considerably
Solution Approach 1:
The heating elements are segmented into multiple sections (first heating section and second heating section) positioned at different locations, with the first heating section in the upper region and the second heating section in the lower region. This segmentation allows independent control and optimization of temperature distribution in different zones, resolving the uniformity issue while maintaining structural simplicity
Solution Approach 2:
Different heating elements are positioned at specific locations optimized for their function: the first heating section is positioned to heat the upper region, while the second heating section heats the lower region. This local optimization ensures each heating element operates at its most effective position, achieving uniform temperature distribution without complex overall structure
2Temperature
If heating elements are positioned to achieve temperature uniformity, then the temperature field homogeneity improves, but the sample space accessibility deteriorates
Solution Approach 1:
The furnace body is divided into an upper furnace body and a lower furnace body that can be separated from each other. This segmentation allows the upper furnace body to be removed for sample loading, providing excellent accessibility, while the heating elements positioned in both upper and lower regions maintain temperature uniformity when the furnace is assembled
Solution Approach 2:
The furnace structure transitions from a static closed form to a dynamic open form during operation. The upper and lower furnace bodies can be separated to enable sample access, then reassembled to create the heated environment. This dynamic configuration resolves the contradiction between accessibility and temperature control
3Adaptability or versatility
If the sample chamber height is increased to accommodate various sample geometries, then the adaptability improves, but the temperature field uniformity deteriorates due to increased distance from heating elements
Solution Approach 1:
The heating system is segmented into multiple heating sections positioned at different vertical locations. This allows the furnace to maintain effective heating across greater heights by having distributed heating zones, enabling accommodation of various sample geometries while preserving temperature uniformity through multi-zone control
Solution Approach 2:
The heating approach transitions from a single horizontal plane to a three-dimensional distributed arrangement. Heating elements are positioned in both upper and lower regions, creating a volumetric heating pattern that maintains temperature uniformity across increased vertical dimensions, thereby accommodating diverse sample geometries
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 design ensures a more uniform temperature profile and enhanced accessibility for sample loading, enabling precise dilatometric investigations with improved temperature uniformity and ease of operation under vacuum or inert gas conditions.
Implementation Method 1
the heating elements are essentially flat on the side facing the sample carrier and delimit the sample chamber on the top and bottom
Implementation Method 2
in the center of the sample chamber there are the least disruptive influences on the sample chamber temperature profile arise and a uniform temperature distribution in the area of the sample is established
Implementation Method 3
the upper and lower heating elements and the side walls of the sample chamber are lined with thermal insulation
Data Source
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AI summary
The oven has a closable testing area (8), in which a window (20) for feed through of rays (35) is provided. A sample carrier (14) with a horizontal bearing surface for accommodation of samples (11) is provided in the testing area, where the testing area is heated by heating elements (9, 10). The heating elements are evenly formed on a side opposite to the sample carrier, and the testing area is bordered at an upper side and a lower side, where the heating elements are extended in a horizontal direction over the sample carrier.