Single Air Collection Box with Laminar Flow Element for Accurate Airflow Measurement
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Solution Overview
Problem
Conventional airflow benches incur pressure and flow losses due to repeated expansion and contraction of air through two collection boxes, leading to inaccurate and inefficient airflow measurements.
Innovation Solution
A testing system with a single air collection box and a laminar flow element (LFE) that eliminates the need for a second collection box, using a blower to exhaust airflow directly through the LFE, reducing pressure and flow losses and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional airflow bench uses two collection boxes with a nozzle or orifice plate, then airflow can be measured, but pressure and flow losses occur due to repeated expansion and contraction of air
Solution Approach 1:
The patent removes the second collection box and the nozzle/orifice plate from the conventional two-box system. By extracting these components, the system eliminates the repeated expansion and contraction of air that causes pressure and flow losses, while still enabling airflow measurement through the single collection box with a different measurement approach
Solution Approach 2:
The patent merges the functions of the two separate collection boxes into a single collection box that handles both air intake and measurement functions. This consolidation eliminates the intermediate nozzle/orifice plate and reduces the number of times air expands and contracts, thereby reducing energy losses while maintaining measurement capability
2Measurement precision
If a conventional airflow bench uses two collection boxes, then airflow can be measured, but the system becomes more complex and requires larger components
Solution Approach 1:
The patent extracts and removes the second collection box and the nozzle/orifice plate from the system. This extraction simplifies the overall device structure by reducing the number of major components while maintaining the essential airflow measurement function through the single collection box
Solution Approach 2:
The patent combines the functions previously distributed across two collection boxes into a single integrated collection box that performs both air collection and measurement functions, thereby reducing device complexity and the number of required components
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 system achieves more accurate and consistent airflow measurements with reduced uncertainty (±3% compared to ±15%) and requires a smaller blower, enhancing efficiency and reliability.
Implementation Method 1
A laminar flow system includes a laminar flow element (LFE) in sealed fluid communication with the air collection box at the outlet end
Implementation Method 2
a pressure transducer in fluid communication with the laminar flow element for sensing the differential air pressure across the laminar flow element
Implementation Method 3
A blower is in sealed fluid communication with an outlet of the laminar flow element for generating airflow into the air collection box through a unit under test
Data Source
AI summary
A testing system includes a single air collection box and a laminar flow system for obtain an airflow measurement. The single airflow box has air inlet and outlet ports at opposite ends. The laminar flow element has a laminar flow element inlet in fluid communication with the air collection box and a laminar flow element outlet sealed with the air outlet port of the air collection box. A blower in fluid communication with the laminar flow element outlet draws airflow into the air collection box through a unit under test and out of the air collection box through the laminar flow element. A pressure transducer senses the differential air pressure across the laminar flow element and enables a determination of the airflow rate.