Cold Trap Segmentation for Continuous Vacuum Operation
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Solution Overview
Problem
Existing cold traps face performance degradation due to moisture accumulation, requiring periodic regeneration that disrupts continuous operation and affects vacuum quality or device efficiency.
Innovation Solution
A cold trap system with multiple individually controllable cooling units, allowing for staggered regeneration modes to maintain continuous operation without isolating the vacuum system, utilizing Gifford-McMahon refrigerators and a control unit to manage the transition between normal and regeneration modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cold trap is used for evacuation, then the structure is simple, but the cold trap must be isolated or operation suspended during regeneration
Solution Approach 1:
The cold trap is divided into multiple independent cooling units (first cooling unit with first panel unit, second cooling unit with second panel unit), each capable of independent operation and regeneration. This segmentation allows one unit to be regenerated while another continues evacuation, enabling continuous operation without isolating the entire vacuum system.
2Reliability
If the cold trap is isolated during regeneration, then the regeneration can be performed effectively, but the vacuum system operation is disrupted
Solution Approach 1:
By dividing the cold trap into multiple independent cooling units, the system can perform regeneration on one unit while maintaining evacuation function through other units. The panel units are spaced apart to allow independent access and regeneration operations.
Solution Approach 2:
The multiple cooling units operate in a staggered manner where one unit performs regeneration while another maintains evacuation. This ensures continuous useful action (vacuum evacuation) without interruption, as the system transitions smoothly between regeneration and operation phases across different units.
3Device complexity
If a single cooling unit is used, then the device is simpler, but periodic regeneration causes downtime and affects efficiency
Solution Approach 1:
The cold trap is segmented into multiple independent cooling units that can operate and regenerate independently. This eliminates downtime by ensuring that while one unit is regenerating, another unit is maintaining evacuation, thus continuous productivity is achieved.
Solution Approach 2:
The system implements periodic regeneration cycles for each cooling unit in a staggered sequence. Instead of simultaneous regeneration that would cause downtime, the periodic actions are offset in time, ensuring continuous operational coverage.
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
Enables continuous operation of the cold trap, improving productivity by minimizing the impact on vacuum quality and device efficiency during regeneration, and efficiently managing gas discharge.
Implementation Method 1
a refrigerator thermally coupled to the panel unit and configured to cool the panel unit
Implementation Method 2
freeze and capture gas arriving from the volume subject to evacuation via the evacuation path on the surface of the panel unit
Implementation Method 3
vaporize the gas frozen on the surface of the panel unit and discharge the gas outside using a vacuum pump
Data Source
AI summary
A cold trap includes two individually controllable cooling units. The cold trap is provided in an evacuation path for connecting a vacuum chamber to a turbomolecular pump, The first cooling unit includes a first panel unit provided in the evacuation path such that the panel is exposed, and a first refrigerator thermally coupled to the first panel unit so as to cool the first panel unit. The second cooling unit includes a second panel unit provided in the evacuation path such that the panel is exposed, and a second refrigerator thermally coupled to the second panel unit so as to cool the second panel unit. The first panel unit is spaced apart from the second panel unit.