Tornado Sampling Device for Trace Vapor Detection
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Solution Overview
Problem
Existing sampling methods for gas-borne substances, such as VOCs and Semi-VOCs, face inefficiencies in collection and sensitivity, particularly in direct gas suction-in processes and surface contamination detection, limiting their suitability for rapid and trace vapor sampling.
Innovation Solution
A tornado-type sampling device with a gas curtain guide is employed, featuring a truncated cone design that generates a funnel-shaped tornado with lower central pressure, enhancing suction efficiency and incorporating a semi-permeable membrane, filter screens, and a temperature-controlling system to improve collection and feeding of volatile substances without unpacking, suitable for IMS and GC-IMS technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct gas suction-in method is used, then sampling process is simple, but sampling efficiency and sensitivity are low
Solution Approach 1:
The patent employs a dynamic tornado generation mechanism where gas flows through curved guide walls to create rotational motion. The sampling system transitions from static direct suction to dynamic vortex flow, where the rotating gas stream enhances mass transfer and sampling efficiency through centrifugal forces and extended residence time in the sampling chamber.
Solution Approach 2:
The patent utilizes pneumatic principles by generating a tornado vortex through controlled gas flow. The curved guide walls convert linear gas flow into rotational flow, creating a vortex that enhances sampling through pneumatic forces. The system uses gas pressure and flow dynamics to achieve amplified collection without mechanical moving parts.
2Adaptability or versatility
If wipe sampling method is used, then surface contamination can be detected, but it cannot sample trace vapors in air
Solution Approach 1:
The tornado sampling device serves multiple functions: it can detect both surface contamination (by sampling air near surfaces) and trace vapors in air (through enhanced vortex sampling). The system is versatile enough to handle different sampling scenarios without requiring separate sampling methods, achieving both surface and air sampling capabilities in one device.
Solution Approach 2:
The patent changes the sampling parameters by creating a vortex flow regime instead of linear flow. This parameter change in flow pattern increases the effective sampling volume and residence time, enabling detection of trace vapors at lower concentrations while maintaining the ability to sample surface emissions.
3Speed
If conventional sampling device is used, then device structure is simple, but detection speed and sensitivity are limited
Solution Approach 1:
The system employs dynamic vortex flow to accelerate the sampling process. The rotational motion creates enhanced mass transfer rates and faster equilibration between sample and detector, increasing detection speed. The dynamic flow pattern reduces sampling time compared to static conventional devices.
Solution Approach 2:
The patent adds a rotational dimension to the sampling flow, transitioning from one-dimensional linear flow to three-dimensional vortex flow. This dimensional change increases the effective sampling path length and interaction volume without increasing device length, thereby improving detection speed and sensitivity.
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 achieves amplified collection and rapid on-site sampling of trace substances, improving detection speed and sensitivity, and is suitable for on-site checks without unpacking, addressing the limitations of prior methods.
Implementation Method 1
As a gas pressure in a swirl center of the tornado is 10 times lower than that in periphery, the truncated cone type tornado generator thus achieves a strong suction effect
Implementation Method 2
A sampling device of the present invention includes a truncated cone type tornado generator to produce funnel-shaped tornado similar to that in the nature
Data Source
Figure 1
Figure 2~3
AI summary
The present invention discloses a sampling device and a gas curtain guide. The sampling device includes: a chamber body having a sample inlet that is located at a first end of the chamber body and is configured for suction of a sample and a sample outlet that is located adjacent to a second end, opposite to first end, of the chamber body and is configured for discharge of the sample. The chamber body is further provided, in a wall of the chamber body, with a gas inflation inlet configured to introduce a swirl gas flow into the chamber body, and a gas exhaust opening configured to discharge gas so as to, together with the gas inflation inlet, generate a tornado type gas flow in the chamber body, which moves spirally from the first end to the second end of the chamber body.