Gas Concentration Device Using Vacuum Transfer for Odor Detection
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Solution Overview
Problem
Current gas detection systems face challenges in achieving high sensitivity and accuracy due to the need for high-concentration gas samples, which is difficult with conventional chemical sensors, especially for odor components present in low concentrations and varying physical properties.
Innovation Solution
The gas detection system employs a gas concentration device with airtight containers and pressure control mechanisms to concentrate odor components from a specimen, using vacuum pumps and shutters to transfer gases between compartments, ensuring high-concentration samples are fed to the chemical sensor at near-atmospheric pressure, reducing noise and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chemical sensors are used for gas detection, then the device structure is simple, but the detection sensitivity is insufficient for low-concentration odor components
Solution Approach 1:
The device is divided into multiple functional modules: a sampling module with first and second containers for gas collection, a concentration module with compression mechanism, and a detection module with chemical sensor. This segmentation allows each module to perform its specific function optimally, achieving high detection sensitivity while maintaining reasonable overall complexity
Solution Approach 2:
The system performs preliminary gas collection and concentration before detection. The sampling module collects odor components in advance, and the compression mechanism concentrates the gas to high concentration before it reaches the chemical sensor, ensuring the sensor receives optimal sample conditions for high-sensitive detection
2Measurement precision
If gas samples are concentrated to high levels, then detection accuracy improves, but the system complexity increases due to pressure control mechanisms
Solution Approach 1:
The system uses pneumatic principles with vacuum pumps to create pressure differences for gas transfer and concentration. The compression mechanism uses pneumatic control to concentrate gas samples to high levels, improving detection accuracy while utilizing well-established pneumatic technology to manage system complexity
3Reliability
If odor components are concentrated from specimens, then detection reliability improves, but the time required for gas collection and concentration increases
Solution Approach 1:
The system enables continuous gas collection in the first container, and when full, automatically transfers to concentration and detection phases. The airtight paths and shutters allow seamless transitions between sampling, concentration, and detection, maintaining continuous useful action and reducing overall detection time while ensuring reliable results
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 approach allows for highly sensitive and accurate detection of odor components by concentrating them to high levels, reducing interference and enabling reliable detection regardless of the odor component's type and physical properties, while maintaining stable sensing conditions.
Implementation Method 1
a state in which a gas has been removed by a vacuum pump (61, 62)
Implementation Method 2
the gas in the second space (22) is compressed by a pressure control device (30)
Data Source
AI summary
A gas concentration device includes a first container, a second container, a pressure control device, and a path. The first container includes a first space surrounded by a first partition wall and stores a specimen, and a pressure inside the first space is reduced. The second container is airtightly connected to the first container by a first path and has a second space surrounded by a second partition wall and stores a gas flowing in from the first space. The pressure control device reduces a volume of the second space. A gas inside the second space is discharged through a second path.