Central Blowing Peripheral Suction Sampling Device
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Solution Overview
Problem
Existing suck-type sampling methods for detecting dangerous articles, such as narcotics and explosives, face inefficiencies due to low sampling rates and incomplete collection of particles adhered to surfaces, as they rely on large air exit sizes and peripheral airflow, which limits the blowing force and sampling efficiency.
Innovation Solution
A sampling device with a central blowing port and peripheral sucking port, utilizing a spiral airflow guiding device or fan to swirl airflow and increase speed, enhancing the blowing force and sampling efficiency by directing airflow centrally to dislodge particles, which are then captured peripherally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If airflow is blown from peripheral of sampling device and sucked at center part, then sampling efficiency is improved, but blowing force becomes small due to large air exit size
Solution Approach 1:
The patent inverts the conventional airflow configuration by blowing air from the center part of the sampling device and sucking it at the periphery, rather than the traditional peripheral blowing and central suction. This inversion allows the air exit size to be small (at center) while maintaining large blowing force, and the air inlet can be large (at periphery) for efficient particle collection
Solution Approach 2:
The patent creates an asymmetric airflow pattern where the blowing port is positioned at the center and the sucking port is positioned at the periphery, forming a radial airflow pattern. This asymmetric configuration optimizes both blowing force concentration at the center and sampling efficiency at the periphery, resolving the contradiction between the two parameters
2Device complexity
If direct suction method is used to suck air from surrounding environment, then device complexity is reduced, but only volatilized gases or fine particles in free state can be captured, not adhered particles
Solution Approach 1:
The patent applies preliminary action by first blowing airflow toward the sampling surface to dislodge and raise particles before suction is applied. This preliminary blowing action ensures that adhered particles are lifted into the air stream, making them available for subsequent collection by the suction device, thereby improving sample collection completeness without significantly increasing device complexity
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 configuration provides a higher blowing force and improved sampling efficiency by achieving faster airflow with lower flow rates, ensuring effective collection of particles from surfaces into the detection device.
Implementation Method 1
using a spiral airflow guiding device or a fan provided within the blowing port to blow airflow towards the sampling surface through the blowing port such that the airflow blown is swirled above the sampling surface
Implementation Method 2
the airflow blown is swirled above the sampling surface
Implementation Method 3
sucking the airflow blown towards the sampling surface through the sucking port so as to collect samples
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed is a sampling method which comprises the steps of: blowing airflow towards a center portion of a sampling surface through a blowing port; and sucking the blown airflow from periphery of the sampling surface through a sucking port, or a sampling method which comprises the steps of: providing a sampling device on a sampling surface, the sampling device being shaped to form a sampling space together with the sampling surface, and the sampling device including a blowing port arranged at the center portion of the sampling device and a sucking port arranged at periphery of the sampling device; blowing airflow towards the sampling surface through the blowing port; and sucking the airflow blown towards the sampling surface through the sucking port so as to collect samples. The present application also relates to a sampling device which comprises a housing which is shaped to form a sampling space together with a sampling surface; a blowing port which is provided at a center portion of the housing to blow airflow towards the sampling surface; a sucking port which is provided at periphery of the housing to suck the airflow blown towards the sampling surface. According to the present invention, a blowing airflow having a higher speed is obtained with a lower flow rate of the blowing airflow, and at the same time, raised particles move towards the periphery together with the airflow and are captured by the sucking device provided at the periphery, thus, a sampling efficiency is improved.