Air duct airflow sensor
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Solution Overview
Problem
Conventional airflow sensors in air ducts are dependent on airflow orientation and prone to clogging, limiting their placement and accuracy, especially near bends in the duct.
Innovation Solution
An airflow sensor assembly with a hollow ring and gasket design that includes apertures orthogonal to airflow, reducing clogging risk and allowing placement closer to duct bends, featuring a pressure sensor connected to tubes for measuring high and low pressure differentials to calculate air velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional airflow sensors are used in air ducts, then they can detect airflow pressure, but they are dependent on airflow orientation and prone to clogging, limiting their placement flexibility
Solution Approach 1:
The sensor divides airflow detection into two separate detection devices: a high pressure detection device with apertures facing upstream and a low pressure detection device with apertures facing downstream. This segmentation allows each device to detect pressure from its specific direction without being blocked by debris, resolving the contradiction between placement flexibility and clogging susceptibility
Solution Approach 2:
The invention transitions from single-direction pressure detection to multi-directional pressure detection by positioning apertures in opposite directions (upstream and downstream). This dimensional change in detection orientation enables the sensor to function reliably regardless of airflow direction or proximity to duct bends, achieving both placement flexibility and anti-clogging reliability
2Adaptability or versatility
If pressure sensors are placed closer to duct bends for flexible positioning, then placement flexibility improves, but measurement precision deteriorates due to turbulent airflow and orientation dependence
Solution Approach 1:
By segmenting the detection into upstream-facing and downstream-facing pressure sensors, the system can accurately measure pressure differentials even in turbulent flows near bends. Each sensor captures pressure from its designated direction, and their combined differential provides precise airflow measurement independent of orientation
Solution Approach 2:
The dual-pressure detection design creates a universal sensor that functions accurately in various airflow conditions and orientations. The sensor can be placed anywhere in the duct (near bends, straight sections, different orientations) while maintaining measurement precision, achieving both adaptability and accuracy
3Reliability
If apertures are oriented orthogonal to airflow direction, then clogging resistance improves, but the ability to detect airflow pressure accurately may worsen
Solution Approach 1:
Instead of having apertures face directly into the airflow (which would be accurate but prone to clogging), the invention inverts the approach by having apertures face upstream and downstream perpendicular to the main flow direction. This allows pressure detection through the sidewalls, achieving both clogging resistance and accurate differential pressure measurement
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 design provides accurate airflow measurements independent of orientation, reduces clogging, and allows for flexible placement, maintaining high airflow velocity with minimal obstruction, enabling effective control of air ducts.
Implementation Method 1
a pressure sensor fluidly coupled to the high pressure detection device and the low pressure detection device
Data Source
AI summary
An airflow sensor assembly for an air duct is provided. The airflow sensor assembly includes an air duct having an interior wall and an exterior wall, a high pressure detection device, and a low pressure detection device. The low pressure detection device includes a hollow ring disposed within the interior wall of the air duct. The hollow ring includes an inner periphery portion, an outer periphery portion, and a first set of apertures defined therein. The first set of apertures is spaced around the inner periphery portion of the hollow ring. The airflow sensor assembly further includes a pressure sensor fluidly coupled to the high pressure detection device and the low pressure detection device.