Variable Orifice Airflow Measurement for Wide Ventilation Resistance Range
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Solution Overview
Problem
Existing airflow volume measurement devices lack versatility in measuring airflow volumes and ventilation resistance across various ranges, particularly in devices like servers, information base stations, and fans, due to limitations in nozzle design and chamber size, leading to inaccurate measurements and poor adaptability.
Innovation Solution
A measurement device with a housing containing an air duct, an opening member with a variable orifice, and pressure sensors to measure air pressures before and after the air passes through, allowing for adjustable opening sizes to accommodate different airflow volumes and improve measurement accuracy and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed nozzle design is used, then the device structure is simple, but the measurement accuracy across various airflow ranges is poor
Solution Approach 1:
The patent applies the dynamics principle by making the nozzle opening adjustable rather than fixed. The opening member can change the nozzle opening area according to different measurement requirements, allowing the device to adapt to various airflow volume ranges while maintaining measurement accuracy. This resolves the contradiction by transforming a static structure into a dynamic one that can be optimized for different conditions.
Solution Approach 2:
The patent applies parameter changes by varying the nozzle opening area parameter to suit different measurement scenarios. By changing the opening area parameter, the device can accurately measure both small and large airflow volumes. This directly addresses the measurement accuracy issue across various ranges while managing device complexity through a controlled adjustment mechanism.
2Adaptability or versatility
If multiple nozzle sizes are used to measure various airflow volumes, then the measurement versatility is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a single nozzle structure with an adjustable opening member that can perform multiple measurement functions. Instead of requiring multiple fixed nozzles of different sizes, one universal nozzle can measure various airflow volumes by adjusting the opening area. This eliminates the need for multiple components while maintaining measurement versatility across different ranges.
Solution Approach 2:
The adjustable opening member transforms a static single-nozzle design into a dynamic multi-functional device. The nozzle can adapt its opening area to suit different measurement requirements, providing versatility without requiring multiple physical nozzles. This dynamic adjustment capability resolves the contradiction between versatility and device complexity.
3Measurement precision
If a large nozzle opening is used, then large airflow volumes can be measured, but small airflow volumes cannot be measured accurately
Solution Approach 1:
The patent uses dynamics by implementing an adjustable opening member that can change the nozzle opening area based on the airflow volume being measured. For small airflow volumes, the opening is reduced to maintain accuracy; for large airflow volumes, the opening is increased to accommodate the higher flow. This dynamic adjustment allows the device to maintain measurement precision across the entire measurement range.
Solution Approach 2:
The patent applies parameter changes by adjusting the nozzle opening area parameter according to the measurement requirements. The opening area is varied to optimize measurement accuracy for different airflow volumes, enabling the device to handle both small and large flows accurately within a single unified structure.
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 device effectively measures airflow volumes and ventilation resistance across a wide range of values, enhancing measurement accuracy and adaptability, and reducing the need for multiple nozzle sizes, thus improving cost-effectiveness and usability.
Implementation Method 1
pressure sensors configured to measure air pressures before and after the air passes through the opening member in the air duct
Implementation Method 2
the technique disclosed in JP-A-2005-207832 includes the nozzle, which generates differential pressure of air between the first chamber and the second chamber
Data Source
AI summary
A measurement device for measuring an airflow volume of a wind-blowing apparatus includes, a housing that includes an air duct with an air inlet and an air outlet, the air inlet being configured to take in air, the air outlet being configured to send out the taken air, an opening member installed inside the air duct, the opening member including an opening allowing the air taken from the air inlet to pass therethrough, pressure sensors configured to measure air pressures before and after the air passes through the opening member in the air duct, and an orifice provided on the opening member to change a size of the opening.