GC-MS Interface Heating for Uniform Line Pipe Temperature
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Solution Overview
Problem
The existing gas chromatograph-mass spectrometer systems face issues with non-uniform temperature distribution in the interface, leading to adsorption of high boiling point components on low temperature portions of the column, which degrades analysis accuracy.
Innovation Solution
Incorporating a heater block that directly contacts a partition wall within the interface, with a nut member or fixing plate to ensure efficient thermal conduction and uniform heating of the line pipe, reducing temperature differences and heat dissipation to the vacuum housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater block is provided in the interface to prevent temperature decrease of the column, then the temperature of the column is maintained, but the temperature distribution in the interface becomes non-uniform causing sample adsorption on low temperature portions
Solution Approach 1:
The patent applies local quality by providing a heater specifically at the partition wall portion where temperature decrease occurs, rather than uniformly heating the entire interface. This localized heating approach addresses the specific cold spot caused by heat dissipation to the vacuum housing while maintaining temperature uniformity in the critical column region.
Solution Approach 2:
The partition wall acts as an intermediary element that requires additional heating. By placing a heater at the partition wall portion, the patent mediates the heat transfer between the main heater block and the vacuum housing, ensuring uniform temperature distribution across the interface while preventing sample adsorption.
2Device complexity
If the interface structure is simplified without additional heating components, then device complexity is reduced, but temperature distribution uniformity deteriorates leading to sample loss
Solution Approach 1:
The patent merges the partition wall structure with a dedicated heater component, combining the structural function of the partition wall with the thermal function of heating. This integration maintains relative structural simplicity while ensuring uniform temperature distribution through the partition wall portion.
3Manufacturing precision
If heating power is increased to maintain uniform temperature, then temperature distribution uniformity is improved, but energy consumption increases
Solution Approach 1:
By applying local quality through targeted heating at the partition wall portion, the patent reduces overall energy consumption compared to uniform heating of the entire interface. The heater is positioned only where heat dissipation to the vacuum housing occurs, minimizing unnecessary energy expenditure while maintaining temperature uniformity.
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 enhances the uniformity of temperature distribution along the line pipe, preventing sample adsorption on low temperature portions and improving analysis accuracy by maintaining consistent temperatures.
Implementation Method 1
a heater that heats the line pipe in an axial direction
Data Source
AI summary
A gas chromatograph-mass spectrometer includes a gas chromatograph having a column that separates a sample into components, a mass spectrometer provided in a vacuum housing, and an interface that introduces a sample that has been separated into components in the gas chromatograph into the mass spectrometer, and the interface includes a partition wall fixed to the vacuum housing to close an opening formed in the vacuum housing, a line pipe that is fixed to the partition wall to penetrate the partition wall, includes a sample outlet line of the column and introduces the sample into the mass spectrometer, a heater that heats the line pipe in an axial direction, and a fixer that fixes the heater being in contact with the partition wall.