Decompression Drying Chamber Airflow Control Near Target Pressure
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Solution Overview
Problem
Conventional decompression drying methods lack a means to finely introduce external air into the drying chamber during the decompression process, leading to significant pressure fluctuations near the target pressure, which adversely affect the drying process and the stability of the pressure inside the chamber.
Innovation Solution
A decompression drying device equipped with a separate external air introduction means, including an automatic vacuum regulating valve and a manual valve, allows precise control of external air flow to stabilize the pressure by introducing a small amount of air when the chamber approaches the target pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external air is introduced into the drying chamber to restore pressure after decompression drying, then the pressure inside the chamber can be restored to normal pressure, but the pressure inside the chamber cannot be precisely controlled near the target pressure during the decompression drying process
Solution Approach 1:
The air introduction function is segmented into two separate systems: a release valve for large-flow pressure restoration and an external air introduction means for fine-flow pressure control. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between reliable pressure control and operational precision.
Solution Approach 2:
The external air introduction means acts as an intermediary device between the vacuum state and normal pressure state. By introducing a small, controlled amount of air, it mediates the transition process to achieve stable target pressure without the abrupt pressure changes that would occur with direct large-flow air introduction.
2Stress or pressure
If a release valve is used to introduce external air into the drying chamber, then the pressure can be restored to normal pressure after drying, but the pressure inside the chamber fluctuates sharply near the target pressure during decompression drying
Solution Approach 1:
The external air introduction means is activated in advance when the pressure approaches the target pressure range, before the final pressure restoration phase. This preliminary action prevents sharp pressure fluctuations by gradually introducing air to stabilize pressure near the target value before completing the drying process.
Solution Approach 2:
The system dynamically switches between different air introduction modes: using the external air introduction means for fine control near target pressure, and switching to the release valve for rapid pressure restoration after drying. This dynamic adaptation optimizes both pressure stability and drying efficiency at different stages.
3Object-affected harmful factors
If the pressure inside the drying chamber is reduced to evaporate liquid into gas, then the drying process can proceed without heating, but the pressure changes rapidly when approaching the target pressure
Solution Approach 1:
The system continuously monitors pressure during decompression drying and provides feedback control through the external air introduction means. When pressure approaches the target range, the feedback mechanism activates to introduce small amounts of air, stabilizing pressure and preventing rapid changes that would disrupt the evaporation process and affect sample composition.
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
The device effectively maintains stable target pressure by preventing rapid pressure changes, ensuring consistent drying conditions and protecting heat-sensitive samples from damage.
Implementation Method 1
a vacuum pump for reducing the pressure inside the drying chamber
Implementation Method 2
evaporating the liquid into a gas by reducing the pressure in the chamber where the liquid sample is placed to a pressure range below the vapor pressure curve of the liquid
Implementation Method 3
an automatic vacuum regulating valve for controlling flow of external air introduced into the drying chamber
Data Source
AI summary
A decompression drying device includes, in addition to a conventional release valve for introducing external air to restore the inside of a drying chamber to a normal pressure after drying has been completed, a separate external air introduction means for introducing external air into the drying chamber when the pressure inside the drying chamber has reached near a target pressure during a decompression drying process. The decompression drying device is used for drying a pharmaceutical product and, in particular, is used for manufacturing a botulinum toxin dried cake. By introducing external air while finely adjusting its inflow amount when the pressure inside the drying chamber reaches near the target pressure during the decompression drying process, it is possible to prevent a phenomenon in which the pressure inside the drying chamber, particularly the pressure around a vial containing a liquid sample, rises and decreases significantly.