Airborne component extractor with adjustable flow rates
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Solution Overview
Problem
Current fume extraction systems are limited in their ability to effectively draw and remove fumes and smoke from metal working workspaces over a wide area, with a need for improved suction capacity and distance coverage.
Innovation Solution
The implementation of a fume extraction system that combines positive airflow with suction airflow, utilizing a hood design with an annular space for radial air flow and adjustable flow rates to enhance the evacuation of airborne components, allowing for greater distance and volume of fume removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional suction-only systems are used, then the system structure is simple, but the effective capture distance and volume are limited
Solution Approach 1:
The patent combines positive airflow (pushing) with negative airflow (suction) into a unified extraction system. The hood simultaneously receives ambient air through inlet openings and draws process air through suction, merging two airflow mechanisms to extend capture distance and volume beyond what conventional suction-only systems can achieve.
Solution Approach 2:
The hood is segmented into distinct functional zones: inlet openings for positive airflow, an annular space for radial flow, and suction openings for negative airflow. This segmentation allows each zone to perform its specific function optimally while working together to enhance overall capture effectiveness.
2Volume of moving object
If suction flow rate is increased to expand capture distance, then capture volume improves, but energy consumption increases
Solution Approach 1:
The positive airflow from inlet openings performs preliminary action by pushing airborne components toward the suction zone before the suction force acts on them. This pre-positioning of contaminants closer to the suction openings reduces the suction force and energy required to achieve the same capture distance compared to suction-only systems.
Solution Approach 2:
The system utilizes pneumatic principles by combining pressurized inlet airflow with suction airflow through the annular space. This dual pneumatic action creates a more efficient airflow pattern that extends capture distance while balancing energy consumption, as the positive and negative pressures work synergistically rather than requiring high suction alone.
3Productivity
If adjustable flow rates are added to optimize performance, then extraction effectiveness improves, but device complexity increases
Solution Approach 1:
The hood incorporates adjustable inlet openings and variable suction capabilities, transforming a static system into a dynamic one. Users can adjust the positive airflow rate through inlet openings and modify suction flow rate to match different process conditions, workpiece configurations, and contamination levels, thereby optimizing extraction effectiveness for each specific application.
Solution Approach 2:
The system allows parameter changes in airflow rates (both positive and negative) to adapt to different operational requirements. By varying flow rates, the system can optimize capture effectiveness for different distances, workpiece geometries, and contaminant types, making the extraction process adaptable rather than fixed.
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 significantly enhances the capture of airborne components such as smoke, fumes, and particulate matter, enabling effective removal at greater distances and volumes compared to conventional systems, with adjustable flow rates optimizing performance.
Implementation Method 1
a blower delivers a positive pressure air flow to a hood that creates a radial air flow pattern
Implementation Method 2
draws negative pressure air flow from a workspace through inlet openings
Data Source
Figure 1~1B
Figure 2A~2
Figure 3~4
AI summary
A extraction system is designed for metal working and other applications. The system may comprise a cart-type base or may be incorporated into a fixed or semi-fixed installation. A blower delivers a positive pressure airflow to a hood that creates an air region by directing the air through an annular space between inner and outer shrouds, impacting the air against a single generally perpendicular flange. Return air from the operation may be mixed with fresh air, both of which may be filtered, to supply the positive pressure air. Both air streams to and from the hood may be adjusted to optimize operation. Adjustments may be made at the base unit or remotely.