Airflow Sensor with Multi-Port Averaging for Duct Pressure Measurement
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Solution Overview
Problem
Existing air duct systems face challenges in accurately measuring airflow pressure due to limitations in sensing technology, particularly in balancing airflow for heating, cooling, or ventilating controlled spaces, as current systems often rely on static and total pressure measurements that may not account for variations in airflow dynamics.
Innovation Solution
A sensor apparatus is designed with a dual-sensor configuration, featuring a first sensor with a curved surface profile positioned upstream and a second sensor with a planar surface profile positioned downstream, both having multiple ports to sense airflow pressures, which are averaged to provide accurate total and static pressure measurements, enabling precise airflow velocity calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pressure sensing tubes are oriented perpendicular to each other to measure total pressure, then measurement coverage is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple pressure sensing functions into a single integrated sensor housing that contains multiple sensing elements oriented in different directions. Instead of using separate perpendicular sensing tubes, the invention merges them into one unified device with multiple ports and internal pressure averaging chambers, reducing installation complexity while maintaining measurement accuracy.
Solution Approach 2:
The sensor is divided into multiple functional segments including separate ports for total pressure measurement, static pressure measurement, and dynamic pressure measurement. Each segment handles a specific measurement function, allowing the complex measurement task to be broken down into manageable independent components that work together.
2Measurement precision
If a static pressure sensing tube is positioned away from the airflow, then it accurately senses static pressure, but it cannot capture total pressure measurements
Solution Approach 1:
The sensor device is designed to perform multiple pressure measurement functions simultaneously. It can measure static pressure, total pressure, and dynamic pressure by using multiple sensing ports and internal pressure averaging chambers that capture different pressure components from the same airflow environment.
Solution Approach 2:
The patent introduces internal pressure averaging chambers and connecting passages as intermediaries between the external airflow and the sensing elements. These intermediaries allow the sensor to capture and average pressure information from different locations and orientations, enabling accurate static pressure measurement while also capturing total pressure data.
3Measurement precision
If pressure averaging is performed at the center of sensing tubes, then measurement accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The pressure averaging function is segmented into separate internal chambers that receive pressure inputs from multiple ports. Instead of requiring precise center positioning of a single averaging point, the invention divides the averaging process into multiple discrete chambers that can be manufactured with standard tolerances and then assembled together.
Solution Approach 2:
Internal connecting passages and pressure equalization chambers serve as intermediaries that guide pressure flows from multiple ports to the sensing elements. These intermediaries compensate for manufacturing variations by providing flow paths that naturally balance pressure distributions, reducing the impact of positioning inaccuracies.
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 sensor apparatus effectively measures airflow pressures across the air duct system, providing accurate airflow velocity calculations that enhance airflow balance and distribution in controlled spaces, improving system efficiency and performance.
Implementation Method 1
an airflow sensing system measures the total pressure and the static pressure of the airflow in the duct. The total and static pressure measurements are used to determine the velocity pressure of the airflow.
Data Source
AI summary
A sensor apparatus for measuring a pressure of an airflow in a duct. The sensor apparatus includes a first sensor portion that includes a first end and a second end, and that is without ports in communication with the airflow. The sensor also includes a second sensor portion that is coupled to the first sensor portion adjacent the first end, and a third sensor portion that is coupled to the first sensor portion adjacent the second end. The second sensor portion includes a first port that senses a first airflow pressure of the airflow, and a second port that senses a second airflow pressure of the airflow. The third sensor portion includes a third port that senses a third airflow pressure of the airflow, and a fourth port that senses a fourth airflow pressure of the airflow.