Enclosure Sampling Tower for Particle Collection
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Solution Overview
Problem
Existing methods for collecting and analyzing particles from machining processes, such as drilling and milling, face challenges due to the variability in particle size and the impact of dust extraction systems on sampling accuracy, leading to contamination and inaccurate representation of particles produced.
Innovation Solution
A system comprising an enclosure with a filter and a vacuum source, along with a sampling tower, is used to create a sealed volume around the particle-producing device, employing a flexible anti-static nozzle for efficient particle collection and isokinetic sampling to ensure accurate analysis of aerosol streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If open air sampling is performed around a particle generating device, then particle analysis can be conducted, but the sampling accuracy is significantly impacted by distance and location relative to the particle source
Solution Approach 1:
A sampling probe is introduced as an intermediary device that extends into the enclosure to directly sample particles at the source location. This mediator allows accurate particle collection without requiring complex positioning systems or multiple sensors at various distances from the particle source.
Solution Approach 2:
The sampling approach transitions from external ambient air sampling to internal enclosure sampling by extending the sampling probe through the enclosure wall. This dimensional change allows direct access to the particle source environment, eliminating the need for precise external positioning.
2Object-affected harmful factors
If a dust extraction system is activated during particle production, then dust is removed from the area, but the particle analysis no longer accurately represents particles produced by the device
Solution Approach 1:
The sampling probe is positioned and sampling begins before the dust extraction system is activated. This preliminary action captures the particle generation characteristics before the extraction system alters the particle distribution and concentration in the ambient air.
Solution Approach 2:
The sampling system extracts particles directly from the enclosure environment where they are generated, separating the sampling function from the dust extraction function. This allows particle analysis to proceed independently of the dust extraction system's operation.
3Productivity
If an enclosure is used to create a sealed volume around the particle producing device, then particle collection efficiency is improved, but the system complexity increases
Solution Approach 1:
The enclosure utilizes flexible materials that can be easily configured around different particle producing devices. This flexibility reduces the complexity of customization and installation while maintaining the sealed volume necessary for effective particle collection.
Solution Approach 2:
The enclosure design serves multiple functions: it creates a sealed volume for particle collection, provides mounting surfaces for sampling probes, and can be configured for various particle producing devices. This multi-functionality reduces overall system complexity by combining several requirements into a single component.
4Reliability
If a filter is used to filter air directed to the enclosure, then contamination is reduced, but the system complexity and cost increase
Solution Approach 1:
The filter acts as an intermediary component that cleans the air supply to the enclosure without requiring complex air handling systems. This simple filtration approach maintains sampling accuracy by preventing external contaminants from entering the sealed enclosure.
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 system effectively captures and characterizes particles, providing accurate size and distribution data, improving process efficiency, worker safety, and enabling real-time monitoring, while minimizing contamination and disturbance to existing systems.
Implementation Method 1
The vacuum source is configured to be coupled in flow communication with the outlet of the enclosure to generate an aerosol stream from the enclosure to the vacuum source
Implementation Method 2
The filter is configured to be coupled to the inlet of the enclosure and configured to filter air directed to the enclosure through the inlet
Implementation Method 3
The outlet includes a flexible anti-static nozzle for extracting particles from enclosure. The vacuum source is configured to be coupled in flow communication with the outlet of the enclosure to generate an aerosol stream
Data Source
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AI summary
An example method for collection and analysis of particles from a particle generating source enclosed within an enclosure having an inlet and an outlet is described. The method includes supplying filtered air into the enclosure through the inlet, extracting, with a vacuum source, an aerosol stream including particles from the particle generating source through the outlet, directing the aerosol stream from the outlet of the enclosure to the vacuum source via a sampling tower. The sampling tower includes at least one nozzle for sampling the aerosol stream. The method includes detecting, with a detection instrument coupled to the nozzle, at least one characteristic of the particles in the aerosol stream, and outputting data concerning the detected characteristic of the particles in the aerosol stream to a computing device.