Stackable Heater Trays with Expansion Cutouts
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Solution Overview
Problem
Furnace structures and heating elements face issues with thermal expansion, leading to cracks and premature failure due to uneven expansion rates at high temperatures, and existing heating systems struggle to maintain uniform temperature and efficiently place thermocouples without movement.
Innovation Solution
A high performance heater system utilizing stackable trays with alignment pins and cutout portions to allow for expansion, enabling efficient placement and insulation of heating elements and thermocouples, and a unique bussing scheme for optimized heat distribution and reduced tension from thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If heating elements are held firmly by ceramic separators at fixed points for mechanical stability, then mechanical stability is improved, but the heating elements may expand or elongate beyond these points leading to premature failure or breakage
Solution Approach 1:
The heating element support system transitions from a static fixed-point mounting to a dynamic system where the heating element can move axially within the ceramic separators. The separators are positioned to allow expansion while maintaining radial support, enabling the system to adapt to thermal expansion without causing breakage
Solution Approach 2:
The system changes the constraints on the heating element from fixed positional parameters to flexible parameters that allow axial movement. The ceramic separators maintain radial positioning while permitting axial expansion, effectively changing the degree of freedom available to the heating element during thermal cycles
2Strength
If furnace structure components are made rigid to maintain structural integrity, then structural integrity is improved, but uneven thermal expansion rates cause cracks and breakage
Solution Approach 1:
The furnace structure is divided into modular stackable trays that can expand and contract independently. Each tray is a separate component that can accommodate thermal expansion without transferring stress to adjacent trays, preventing crack propagation through the entire structure
Solution Approach 2:
The tray structure incorporates flexible elements including the heating element support system that allows for thermal expansion. The ceramic separators and tray design provide flexible accommodation of dimensional changes while maintaining structural integrity
3Measurement precision
If thermocouples are placed in fixed positions to monitor temperature, then temperature monitoring is improved, but thermal expansion causes thermocouple movement leading to inaccurate readings
Solution Approach 1:
The system introduces flexible mounting mechanisms and expansion compensation structures as intermediaries between the thermocouple and the furnace structure. These intermediaries allow the thermocouple to move with the expanding structure while maintaining electrical connection and positional relationship to the heating element
4Manufacturing precision
If heating elements are tightly constrained to prevent movement, then positioning accuracy is improved, but thermal expansion causes tension and premature failure
Solution Approach 1:
The mounting system transitions from static tight constraints to dynamic constraints that maintain positioning accuracy while allowing for thermal expansion. The ceramic separators provide radial positioning while permitting axial movement, creating a dynamic constraint system
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 system effectively manages thermal expansion, enhances the reliability and lifespan of heating elements, and allows for efficient thermocouple placement, improving the overall performance and longevity of the heater by allowing different wire sizes for varying zones and reducing electrical shorts.
Implementation Method 1
heating elements such as resistance wires may expand, grow, or elongate due to exposure to high temperatures overtime
Implementation Method 2
an area between the outer diameter and the inner diameter of the stackable trays comprises at least one cut out portion that allows expansion of the material(s) when the high performance heater is at high temperatures
Implementation Method 3
Furnace structures typically use heating elements such as resistance wires
Data Source
AI summary
Systems and methods are provided for a high performance heater. In an embodiment, the high performance heater comprises a first stackable tray comprising a first alignment pin that insulates a first heating element disposed in the first stackable tray; a second stackable tray comprising a second alignment pin that insulates a second heating element disposed in the second stackable tray, wherein a top of the first alignment pin fits in to a cut out of a bottom of the second alignment pin when the first and second stackable trays are stacked, and wherein the first and second stackable trays comprise one or more materials, an outer diameter and an inner diameter, and wherein an area between the outer diameter and the inner diameter of the stackable trays comprises at least one cut out portion that allows expansion of the material(s) when the high performance heater is at high temperatures.