Air Sampling System With Digital Flow Switches
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Solution Overview
Problem
Existing air sampling systems in clean rooms suffer from inaccurate volumetric air flow rates, limited control and monitoring capabilities, and lack of modularity and remote operation, making them inadequate for modern clean room requirements.
Innovation Solution
A system comprising multiple air sampling devices with digital flow switches, controlled by a central controller via separate vacuum tubes, allowing for simultaneous measurement and control of air flow rates across multiple locations from a single central location, with alarm activation for deviations from set values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple air sampling devices are deployed at different locations, then measurement coverage and monitoring capability are improved, but device complexity and control difficulty increase
Solution Approach 1:
The system divides the clean room into multiple sampling zones with separate air sampling devices positioned at different locations. Each device independently measures air flow rates in its specific zone, enabling spatially distributed monitoring while maintaining manageable complexity through modular deployment
Solution Approach 2:
A single centralized controller performs multiple functions including controlling vacuum pumps, monitoring flow rates from multiple sampling devices, detecting alarms, and logging data. This multi-functional approach reduces overall system complexity by consolidating control operations rather than requiring separate control units for each sampling device
2Area of stationary object
If air sampling devices are positioned far from the controller, then monitoring coverage is improved, but control and alarm response capability deteriorate
Solution Approach 1:
Vacuum tubes serve as intermediaries that transmit both air samples and control signals between the distributed sampling devices and the centralized controller. The vacuum tubes enable long-distance communication and control while maintaining system functionality, allowing the controller to monitor and respond to conditions at remote locations
Solution Approach 2:
The system replaces mechanical control mechanisms with electronic control and communication systems. The centralized controller uses electronic signals transmitted through the vacuum tubes to control vacuum pumps and monitor flow rates at remote sampling locations, enabling efficient long-distance control and immediate alarm response without mechanical limitations
3Device complexity
If manual control and monitoring is used, then device complexity is reduced, but productivity and operational efficiency deteriorate
Solution Approach 1:
The system performs self-monitoring and self-alarm functions where the centralized controller automatically detects flow rate deviations, triggers alarms when thresholds are exceeded, and logs operational data without requiring manual intervention. This automation maintains relatively simple device architecture while significantly improving operational efficiency and productivity
Solution Approach 2:
The centralized controller continuously receives feedback from flow rate sensors at multiple sampling devices and automatically adjusts vacuum pump operation and alarm conditions based on real-time measurements. This closed-loop feedback system maintains high operational efficiency while keeping control logic centralized and manageable
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 solution provides accurate and precise air flow rate measurement and control, enabling effective monitoring and management of air quality in clean rooms, addressing the limitations of prior systems by ensuring better than ±30% accuracy and enabling remote operation and modularity.
Implementation Method 1
A vacuum pump is provided at a location outside the controlled environment and in air flow communication with the controller via the one or more second vacuum tubes, the vacuum pump providing suction and being controlled by the controller to generate the air flow through each of the first vacuum tubes
Implementation Method 2
A flow switch for each of the two or more air sampling devices is provided at a location between a corresponding air sampling device and the vacuum source, each of the flow switches being configured to separately measure and control the rate of air flow through a corresponding first vacuum tube
Data Source
AI summary
A system and method for sampling air in a controlled environment that includes two or more air sampling devices at different locations within the controlled environment. A controller is provided at a location outside of the controlled environment and in separate air flow communication with each of the two or more air sampling devices via separate first vacuum tubes, the controller having a manifold configured to separately control a rate of air flow from the two or more air sampling devices to the controller via each of the separate first vacuum tubes and to selectively direct the air flow from each of the separate first vacuum tubes to one or more second vacuum tubes. A vacuum source is provided at a location outside the controlled environment and in air flow communication with the controller via the one or more second vacuum tubes, the vacuum source providing suction and being controlled by the controller to generate the air flow through each of the first vacuum tubes. And, a flow switch for each of the two or more air sampling devices is provided at a location between a corresponding air sampling device and the vacuum source, each of the flow switches being configured to separately measure and control the rate of air flow through a corresponding first vacuum tube. An alarm is automatically activated at a location inside the controlled environment by one or more of the flow switches when the rate of air flow measured at one or more of the flow switches deviates from a desired value by a predetermined amount.