Duct Ventilation Airflow Sensing Without Dust-Building Probes
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Solution Overview
Problem
Current ventilation systems lack cost-effective and energy-efficient methods for real-time measurement of air velocity within ducts, especially when transporting combustible dust, leading to inadequate air flow velocities and energy wastage due to the obstruction caused by traditional air velocity meters.
Innovation Solution
An air pressure measuring ventilation system with ultrasonic sensors and a control computer that adjusts fan speed and gate openings to maintain optimal air flow velocities without obstructing the air flow, using static air pressure measurements for calibration and automatic adjustments based on workstation activity and material type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional air velocity meters are used to measure air velocity in ducts, then air velocity can be measured, but the meters obstruct the air flow and collect combustible dust, creating safety hazards and measurement inaccuracies
Solution Approach 1:
The patent replaces traditional mechanical air velocity meters (Pitot tubes, hot-wire anemometers) with ultrasonic sensors that use acoustic waves to measure air velocity. The ultrasonic sensors emit sound waves through the duct and measure the Doppler shift or time-of-flight of the waves, allowing non-contact measurement that does not obstruct air flow or collect dust.
Solution Approach 2:
The patent introduces ultrasonic sound waves as an intermediary medium to measure air velocity indirectly. Instead of placing a physical sensor in the air stream, the system uses acoustic waves that pass through the air and dust without being obstructed, allowing measurement of air velocity based on the propagation characteristics of the sound waves.
2Reliability
If air velocity is increased to prevent dust settlement, then dust transport is improved, but energy consumption increases significantly
Solution Approach 1:
The patent implements a closed-loop feedback control system where ultrasonic sensors continuously measure actual air velocity in the ducts, and the control system adjusts fan speed based on these measurements to maintain air velocity within the optimal range for dust transport. This prevents both dust settlement (by maintaining minimum velocity) and excessive energy consumption (by avoiding unnecessarily high velocities).
Solution Approach 2:
The patent makes the ventilation system dynamic by enabling real-time adjustment of fan speed based on actual operating conditions. The system transitions from static fixed-speed operation to dynamic variable-speed operation, allowing optimization of energy consumption while maintaining reliable dust transport through continuous adaptation to changing conditions.
3Ease of manufacture
If pressure sensors are used to calculate air velocity, then measurement cost is reduced, but measurement accuracy deteriorates without proper calibration
Solution Approach 1:
The patent performs preliminary calibration of pressure sensors using ultrasonic sensors as a reference standard. During installation or maintenance, the ultrasonic sensors provide accurate air velocity measurements, which are used to calibrate the pressure sensors to match actual conditions. This preliminary calibration ensures subsequent pressure-based measurements remain accurate without requiring continuous expensive ultrasonic measurement.
Solution Approach 2:
The patent merges two measurement approaches by using ultrasonic sensors for initial calibration and pressure sensors for continuous measurement. The system combines the accuracy of ultrasonic measurement with the cost-effectiveness of pressure sensor measurement, using the expensive ultrasonic sensors only when needed for calibration rather than continuous operation.
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
Ensures continuous, energy-efficient air flow velocities above the minimum required to prevent dust settlement while minimizing energy consumption by automatically adjusting fan speed and gate positions, ensuring compliance with regulatory standards without obstructing the air flow.
Implementation Method 1
one or more ultrasonic sensors that do not obstruct the air as the air is drawn through the duct and measures an air speed of the air
Implementation Method 2
one or more air pressure sensors that are configured to measure a static air pressure of the air
Data Source
AI summary
An air pressure measuring ventilation system, comprising: at least one duct; at least one motorized exhaust fan; one or more ultrasonic sensors; one or more infrared spark detectors; and one or more air pressure sensors. The at least one motorized exhaust fan may draw air through the at least one duct. The one or more air pressure sensors may be placed on a side of the at least one duct such that an air pressure is measured as the air is drawn through the at least one duct, such that a plurality of air pressure measurements are generated. The one or more air pressure sensors may be substantially flush with an interior side of the at least one duct and do not obstruct the air as the air is drawn through the at least one duct.