Gas Chromatograph Fan Isolation for Long-Run Thermal Protection
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Solution Overview
Problem
In gas chromatographs using cold on-column injection, consecutive analyses over long periods cause the cooling fan to exceed its heat-resistant temperature due to heat transfer from the interior space, leading to failure or deterioration.
Innovation Solution
A heat insulating member is interposed between the gas chromatograph body and the cooling fan to thermally isolate the fan, preventing heat transfer and maintaining the fan's temperature within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is mounted on the GC body to cool the sample vaporization unit, then the cooling effectiveness is improved, but the cooling fan temperature exceeds its heat-resistant temperature due to heat transfer from the interior space
Solution Approach 1:
A heat insulating member is introduced as an intermediary between the GC body and the cooling fan. This mediator blocks the heat transfer path from the hot interior space through the GC body to the cooling fan, allowing the fan to operate at safe temperatures while maintaining its cooling function.
Solution Approach 2:
The cooling fan is extracted from the direct thermal environment of the GC body by mounting it on a heat insulating member. This separates the fan from the harmful thermal field, enabling it to function without being damaged by the high temperatures generated during continuous analysis operations.
2Productivity
If the sample vaporization unit is cooled rapidly after sample elution to shorten analysis time, then the productivity is improved, but the heat from the interior space transfers to the cooling fan causing deterioration
Solution Approach 1:
The heat insulating member serves as a protective intermediary that allows aggressive cooling cycles to be implemented for productivity improvement without transferring excessive heat to the cooling fan. This enables rapid temperature cycling of the vaporization unit while protecting the fan from thermal damage.
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
Prevents failure and deterioration of the cooling fan by effectively isolating it from the heat of the gas chromatograph body, ensuring reliable operation during prolonged use.
Implementation Method 1
a heat insulating member is interposed between the gas chromatograph body and a respective one of the at least one cooling fan to thermally isolate the respective one of the at least one cooling fan from the gas chromatograph body
Implementation Method 2
the sample vaporization unit being configured to vaporize a sample injected into the heating space by heat from the heater
Data Source
AI summary
A gas chromatograph includes: a gas chromatograph body having an interior space thermally isolated from an outside; at least one sample vaporization unit mounted on an upper portion of the gas chromatograph body, the sample vaporization unit having a housing provided therein with a heating space surrounded by a heater and being configured to vaporize a sample injected into the heating space by heat from the heater and introduce the vaporized sample into the gas chromatograph body; and at least one cooling fan mounted on the gas chromatograph body to correspond to the at least one sample vaporization unit to blow cooling air toward the least one sample vaporization unit. A heat insulating member is interposed between the gas chromatograph body and the at least one cooling fan to thermally isolate the at least one cooling fan from the gas chromatograph body.