Gas Chromatograph Column Oven Axial Airflow Rectification
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Solution Overview
Problem
Existing gas chromatographs face inefficiencies in air circulation within column ovens, leading to non-uniform temperature distribution and prolonged heating/cooling times due to the radial spread of wind generated by the fan, especially in larger volumes.
Innovation Solution
The implementation of a cylindrical member that surrounds the fan's outer periphery and a rectifying member to guide wind along the axial direction, combined with a heater positioned to minimize radial wind spread and enhance axial airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan is activated to heat or cool the column oven, then the air circulation is achieved, but the heating/cooling time is prolonged due to radial wind spread
Solution Approach 1:
A rectifying member is introduced as an intermediary component between the fan and the column oven environment. This rectifying member receives the radially spreading wind from the fan and redirects it into axial airflow, effectively mediating the transformation from radial to axial flow pattern. This resolves the contradiction by enabling efficient air circulation (productivity) while reducing the time required for heating/cooling cycles.
Solution Approach 2:
The invention changes the flow direction parameter of the air current generated by the fan. By using the rectifying member to convert radial wind spread into axial airflow, the parameter of flow direction is transformed. This parameter change enables the air to circulate more efficiently through the column oven, achieving both faster heating/cooling speeds and reduced circulation time.
2Volume of stationary object
If the volume of the column oven is increased to accommodate multiple columns, then the capacity is improved, but the temperature distribution uniformity deteriorates
Solution Approach 1:
The rectifying member serves as an intermediary that ensures uniform temperature distribution even in larger volume column ovens. By redirecting the fan-generated wind into focused axial airflow, it maintains effective heat transfer throughout the expanded volume, preventing temperature stratification and ensuring uniformity across the larger space.
Solution Approach 2:
The invention addresses the volume expansion issue by changing the airflow dimension from radial to axial. This dimensional change in flow pattern allows the air to traverse the entire length of the column oven effectively, ensuring that even in increased volumes with multiple columns, the temperature distribution remains uniform throughout the expanded space.
3Device complexity
If the fan generates wind in radial direction, then the fan structure is simple, but the air circulation efficiency deteriorates
Solution Approach 1:
The invention segments the air circulation function into two parts: the fan generates simple radial wind (maintaining simple structure), and the rectifying member converts it to axial flow (improving efficiency). This segmentation allows each component to perform its specialized function optimally without increasing overall system complexity significantly.
Solution Approach 2:
The rectifying member acts as an intermediary that bridges the simple radial fan structure and the required axial airflow pattern. It accepts the simple radial output from the fan and transforms it into the efficient axial flow needed for high productivity, thereby decoupling structural simplicity from circulation efficiency.
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 air circulation efficiency, ensuring uniform temperature distribution and reduced heating/cooling times, while minimizing fan power consumption and noise.
Implementation Method 1
The fan is provided with a blade that rotates about a rotation axis in the column oven. The fan is configured to send wind toward the column provided in an axial direction that is a direction along the rotation axis.
Implementation Method 2
In this case, as the air in the column oven is heated while being circulated, the inside of the column oven is heated. When the inside of the column oven is heated, the column is also heated.
Implementation Method 3
as the air in the column oven is heated while being circulated, the inside of the column oven is heated
Implementation Method 4
The cylindrical member is arranged to accommodate at least a part of the fan in a state of being spaced apart from the column in the axial direction and surrounding an outer periphery of the fan along a rotational direction of the blade.
Data Source
AI summary
Provided is a gas chromatograph capable of efficiency circulating air in a column oven. The gas chromatograph is provided with a column oven, a heater, a fan, and a cylindrical member. The column oven accommodates a column. The heater heats the inside of the column oven. The fan has a blade that rotates about a rotation axis in the column oven, and sends air toward the column provided in the axial direction that is a direction along the rotation axis. The cylindrical member is arranged to accommodate at least a part of the fan in a state of being spaced apart from the column in the axial direction and surrounding an outer periphery of the fan along a rotational direction of the blade.