Thermal Process Device Central Zone Cooling Flow
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Solution Overview
Problem
Existing thermal processing systems face challenges in achieving uniform temperature control and reducing cycle time, especially when processing larger batch sizes and higher mass materials, leading to increased cycle time and decreased processing capacity due to inefficient cooling systems with significant temperature gradients.
Innovation Solution
A thermal process device with a thermal processing chamber featuring controllable heating zones, buffer zones, and a secondary shell with a flow passage for a temperature adjusting medium, where the medium flows from the central zone outward to both distal ends, utilizing multiple injection ports and baffles to direct the flow for improved thermal uniformity and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uni-directional flow method is used where temperature adjusting medium is injected at one distal end and exhausted at the other, then the structure is simple, but the injected distal end cools faster creating a large sloping temperature gradient across the load which increases cycle time
Solution Approach 1:
The cooling system is segmented into multiple injection zones along the heating assembly, with injection ports distributed at different locations rather than concentrated at one end. This segmentation allows the temperature adjusting medium to be delivered to multiple zones simultaneously, creating a more uniform temperature gradient and reducing the time required for thermal equalization across the load.
2Temperature
If a bi-directional flow method is used where temperature adjusting medium is introduced alternatingly at both distal ends, then cooling between the two distal ends is more uniform and balanced, but the central mass cools more slowly as heat capacity is lost traveling towards the center
Solution Approach 1:
The cooling system applies local quality by delivering the temperature adjusting medium directly to the central zone first through centrally located injection ports, rather than allowing it to travel from the ends. This ensures that the central mass, which has the highest heat capacity and coolest slowest, receives the cooling medium prioritarily. Additional injection ports are strategically positioned to create different flow patterns for different zones, optimizing cooling speed at each location.
3Productivity
If larger batch sizes and larger size substrates are processed, then production capacity increases, but the mass of material being processed increases resulting in more energy stored and increased cycle time with existing cooling systems
Solution Approach 1:
The cooling system transitions from a one-dimensional flow pattern (single direction from one end) to a multi-dimensional flow pattern with injection ports distributed along the heating assembly in multiple locations. This dimensional expansion of the cooling medium delivery system allows simultaneous cooling of multiple zones, effectively handling the increased thermal mass from larger batch sizes and substrates without proportionally increasing cycle time.
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 enhances cooling capacity and uniformity, reducing recovery time and increasing throughput by delivering the temperature adjusting medium to the central zone first, thereby achieving more uniform cooling across the product mass.
Implementation Method 1
a temperature adjusting medium is forced through the passageways in contact with furnace to adjust the temperature of the thermal process device
Implementation Method 2
the distal end where the temperature adjusting medium is injected will cool faster than at the exhaust end due to the transfer of energy
Data Source
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AI summary
A thermal process device for heat treating a product or plurality of products includes a thermal processing chamber having opposed distal ends and a plurality of controllable heating zones. At least one buffer zone is disposed at each of the distal ends. The buffer zones and heating zones of the thermal processing chamber form a heating element assembly. The heating assembly has an inner and outer surface and a secondary shell is disposed about the outer surface of the heating element assembly and spaced therefrom to form an inlet flow passage for a flow of a temperature adjusting medium along the heating element assembly. Means direct the flow of the temperature adjusting medium in the inlet flow passage to the different zones of the heating assembly to adjust the temperature in the heating zones, wherein a majority of the flow of the temperature adjusting medium is delivered to a central zone of the heating temperature assembly and then outward toward at least one of the distal ends.