Sample Rack Cooling Airflow to Prevent Condensation Ingress
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Solution Overview
Problem
In air cooling systems for sample temperature control in liquid chromatographs, external air inflow through the rack insertion opening can lead to dew condensation, causing operational malfunctions such as rusting and short-circuiting, especially when the sample rack is pulled out.
Innovation Solution
The apparatus incorporates an air temperature control part with a rising guide to direct cooled air above the rack insertion opening when the sample rack is pulled out, and an external air intake part to pressurize the temperature control space, reducing air inflow and preventing dew condensation. Additionally, the air volume of the fan is controlled to minimize air flow during rack removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sample rack is pulled out of the temperature control space, then the sample rack can be removed for sample replacement, but external air flows in from the rack insertion opening causing dew condensation
Solution Approach 1:
The cooling element continues to cool air in the temperature control space before the rack is fully removed, and the fan continues to circulate this cooled air. This preliminary cooling action ensures that the air inside remains cold even when the opening is exposed, preventing dew condensation on components during the rack removal operation.
Solution Approach 2:
The temperature control space maintains a controlled atmospheric environment by continuously circulating cooled air. This creates a protective atmosphere that prevents moisture from external air from condensing on temperature-sensitive components, even when the rack insertion opening is open during sample rack removal.
2Ease of operation
If the rack insertion opening is open for sample rack insertion/removal, then ease of operation is improved, but adiabatic sealing property deteriorates
Solution Approach 1:
The cooling element and fan operate continuously regardless of whether the rack is inserted or removed. This ensures that the temperature control function remains active and effective throughout the entire operation cycle, maintaining stable temperature conditions and adiabatic sealing properties even when the opening is open for extended periods.
Solution Approach 2:
The system prepares and maintains cooled air in the temperature control space before the rack operation begins. This preliminary preparation ensures that when the opening is open, the internal atmosphere is already conditioned and resistant to external air intrusion, minimizing the impact on adiabatic sealing.
3Quantity of substance
If external air flows into the temperature control space, then air exchange occurs, but dew condensation is generated on components
Solution Approach 1:
The continuous circulation of cooled air creates a protected internal atmosphere that is resistant to dew condensation. This controlled environment prevents moisture from external air from condensing on temperature-sensitive components, even when air exchange occurs at the opening.
Solution Approach 2:
The cooling system maintains a buffer of cooled air in the temperature control space before external air can cause condensation. This cushioning effect of pre-cooled air acts as a protective layer that prevents direct contact between warm external air and cold components, eliminating the temperature differential that causes dew condensation.
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 configuration effectively suppresses the inflow of external air, preventing dew condensation and ensuring reliable operation by maintaining the adiabatic sealing property of the temperature control space, even when the sample rack is pulled out.
Implementation Method 1
a cooling element provided to cool the air on a path of air taken in from the air intake portion
Implementation Method 2
a fan for blowing air taken in from the air intake portion toward the sample rack accommodated in the temperature control space
Implementation Method 3
A rising guide is provided to rise air blown from the air blowing part to a position higher than the rack insertion opening
Data Source
AI summary
To suppress inflow of external air through a rack insertion opening while a sample rack is pulled out. An apparatus includes a housing, a temperature control space, and an air temperature control part. The housing has the rack insertion opening on one side surface for putting in and taking out the sample rack. The air temperature control part has an air intake portion for intake of air in the temperature control space, a fan for blowing air taken in from the air intake portion toward the sample rack accommodated in the temperature control space, and a cooling element provided to cool the air on a path of air taken in from the air intake portion. The air temperature control part is configured to reduce an amount of air flowing near the rack insertion opening while the sample rack is pulled out from the temperature control space as compared to while the sample rack is accommodated in the temperature control space, so as to suppress inflow of air through the rack insertion opening.