Isolator Venting Arrangement for Rapid Pressure Equalization Control
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Solution Overview
Problem
Existing isolators in the pharmaceutical industry face challenges in maintaining a consistent internal pressure within the working area, leading to potential deviations from the target pressure due to human error or rapid movements, which can result in a loss of aseptic status and production downtime.
Innovation Solution
The isolator is equipped with a compressed air reservoir connected to the working area via an air line, controlled by a pressure monitoring circuit and a shut-off valve, allowing rapid introduction of compressed air to maintain the internal pressure when deviations occur, using a solenoid valve for quick response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exhaust air unit is controlled to regulate internal pressure, then the target pressure can be maintained under normal conditions, but severe pressure fluctuations cannot be prevented quickly enough when human error or rapid movements occur
Solution Approach 1:
A venting arrangement is pre-configured with a venting opening that can be rapidly opened to equalize pressure differences between the working area and adjacent sections. This preliminary setup allows immediate pressure equalization without waiting for the exhaust air unit to respond, thus preventing severe pressure fluctuations caused by human error or rapid movements.
Solution Approach 2:
The venting arrangement acts as an intermediary mechanism between the working area and adjacent sections. By providing a dedicated pressure equalization path through the venting opening, it mediates pressure differences quickly, complementing the slower-responding exhaust air unit control system.
2Reliability
If the internal pressure drops below the limit pressure for more than 5 seconds, then the aseptic status is lost and production must stop, but the current system cannot prevent this condition quickly enough
Solution Approach 1:
The venting arrangement is pre-configured and ready to immediately equalize pressure if a drop occurs. This preliminary preparation ensures that pressure can be restored before the 5-second threshold is exceeded, preventing loss of aseptic status and avoiding production downtime.
Solution Approach 2:
The venting arrangement provides a safety cushion by offering a rapid pressure equalization mechanism. This beforehand prepared system cushions against pressure drops that could otherwise lead to loss of aseptic status, protecting the production process from interruption.
3Reliability
If employees follow standard operating procedures with slow movements, then pressure fluctuations are minimized, but any human error or rapid movement can still cause severe pressure deviations
Solution Approach 1:
A pressure monitoring circuit continuously monitors the internal pressure and provides feedback to control the venting arrangement. When pressure deviations are detected, the system automatically activates the venting opening to equalize pressure, providing real-time feedback control that maintains stability regardless of operational variations.
Solution Approach 2:
The venting arrangement operates autonomously based on pressure conditions. The pressure monitoring circuit automatically controls the venting opening without requiring employee intervention, allowing the system to self-correct pressure deviations caused by human error or rapid movements while employees maintain operational flexibility.
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 solution ensures rapid pressure equalization, preventing significant deviations from the target pressure and maintaining aseptic conditions, thereby avoiding production downtime and costly clean-ups.
Implementation Method 1
the isolator has a ventilation arrangement which, among other things, contains a pressure monitoring circuit by means of which the internal pressure in the working area is automatically and practically continuously recorded and compared with a reference pressure
Implementation Method 2
using a solenoid valve for quick response
Implementation Method 3
air can flow from the compressed air reservoir into the working area, preventing a further pressure drop to the limit pressure
Data Source
Figure 1
AI summary
In an isolator with a working area and with a ventilation arrangement which has a pressure monitoring circuit which, during use, automatically detects the internal pressure (pi) prevailing in the working area and compares it with a target pressure, and automatically raises the internal pressure (pi) to at least the target value if the target pressure is undershot, the invention proposes that the ventilation arrangement has a compressed air reservoir connected to the working area, in which a reservoir pressure prevails which is at least as high as the target pressure of the working area, wherein an air line runs from the compressed air reservoir to the working area, which air can be selectively interrupted or flowed through by means of a check valve, and that the pressure monitoring circuit is designed in such a way that the check valve is automatically opened if the target pressure is undershot.