Gas Chromatograph Column Module Temperature Control
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Solution Overview
Problem
Conventional gas chromatograph devices face challenges in swiftly adjusting the temperature of the separation column due to high oven heat capacity, leading to increased power consumption and susceptibility to external temperature variations and convection.
Innovation Solution
A gas chromatograph device with a column module featuring a heat insulating member surrounding the separation column, a heater in direct or indirect contact with the column, and air inlet and outlet ports for controlled air flow, allowing independent temperature adjustment and enhanced cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the separation column is covered with heat insulating material to prevent external air influence, then temperature stability is improved, but cooling efficiency deteriorates
Solution Approach 1:
The heat insulating member is segmented to include a through-hole that allows air passage. This segmentation enables the insulating structure to simultaneously provide thermal insulation and facilitate cooling air flow, resolving the contradiction between temperature stability and cooling efficiency.
Solution Approach 2:
A through-hole is introduced as an intermediary element within the heat insulating member. This through-hole serves as a mediator that allows cooling air to pass through the insulating structure, enabling both insulation and efficient cooling to occur simultaneously.
2Stability of the object's composition
If a convection oven is used to control column temperature, then temperature uniformity is improved, but responsiveness deteriorates
Solution Approach 1:
The temperature control function is extracted from the oven system and applied directly to the separation column via a heater in contact with the column. This extraction allows independent, rapid temperature adjustment of the column without being constrained by the oven's high heat capacity and slow response.
Solution Approach 2:
Temperature control is applied locally to the separation column rather than globally to the entire oven. The heater is positioned in direct contact with the column, providing localized heating that achieves rapid temperature changes without requiring the entire oven volume to be heated or cooled.
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 swift and efficient temperature adjustment of the separation column, reducing wait times and improving analysis reproducibility by isolating the column from external air and utilizing air flow for cooling, thus increasing processing efficiency.
Implementation Method 1
surrounding the separation column by a heat insulating member
Implementation Method 2
the separation column is easily affected by the temperature variation of the external air or by convection
Implementation Method 3
a heater, provided inside the column accommodating member, for heating the separation column by being in direct or indirect contact with the separation column
Implementation Method 4
a gap for air to flow along the separation column is provided between the separation column and the heat insulating member
Implementation Method 5
an air inlet port, provided to the column accommodating member, for introducing external air into the gap, and an air outlet port, provided to the column accommodating member, at a position different from the air inlet port, for exhausting air in the gap
Data Source
AI summary
A gas chromatograph includes a column module for independently adjusting the temperature of a separation column. The column module is held by an oven with the separation column being horizontal. The column module includes the separation column for separating a sample gas into components, a column accommodating member accommodating inside the separation column while surrounding the separation column by a heat insulating member, and including a gap between the separation column and the heat insulating member for air to flow along the separation column, and a heater, provided inside the column accommodating member, for heating the separation column by being in direct or indirect contact with the separation column. The column accommodating member includes an air inlet port for introducing external air into the gap between the separation column and the heat insulating member, and an air outlet port for exhausting air in the gap.